US4417042A — Scavengers for one-component alkoxy-functional RT…

Claim 1

Independent Claim 297 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a tack-free elastomer comprising: (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; and (3) a stabilizing amount of silicone scavenger compound for hydroxy functional groups which is a silicon-nitrogen compound selected from the group consisting of (A) a silicon-nitrogen compound having the formula ##STR24## where Y is selected from R'" and R" 2 N-- and (B) a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR25## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR26## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from a SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and an (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, and R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive.

Claim 2

Dependent Claim 297 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a tack-free elastomer comprising: (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; and (3) a stabilizing amount of silicone scavenger compound for hydroxy functional groups which is a silicon-nitrogen compound selected from the group consisting of (A) a silicon-nitrogen compound having the formula ##STR24## where Y is selected from R'" and R" 2 N-- and (B) a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR25## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR26## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from a SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and an (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, and R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive.

Claim 3

Dependent Claim 28 words

The composition of claim 1 wherein there is present from 0.5 to 10 parts by weight of the silicone scavenger per 100 parts by weight of the organpolysiloxane.

Claim 4

Dependent Claim 55 words

The composition of claim 2 wherein the silicone scavenger is a cyclic silazane polymer of chemically combined ##STR27## units where R", R'" are as defined in claim 1 to provide for a ratio of 1.5 to 3.0 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 5

Dependent Claim 65 words

The composition of claim 2 wherein the silicone scavenger is a silazane polymer having at least one unit selected from the group consisting of ##STR28## units, and ##STR29## units where R", R'" are as defined in claim 1 to provide for a ratio of 1.5 to 3 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 6

Dependent Claim 60 words

The composition of claim 2 wherein the silicone scavenger is a silazane polymer which is a linear polymer consisting essentially of ##STR30## units where R" and R'" are as defined in claim 1 to provide for a ratio of 1.5 to 3.0 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 7

Dependent Claim 66 words

The composition of claim 2 wherein the silicone scavenger comprises a silazane polymer having at least one unit selected from the group consisting of ##STR31## units and ##STR32## units where R" and R'" are as defined in claim 1 to provide for a ratio of 1.5 to 3 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 8

Dependent Claim 57 words

The composition of claim 2 wherein the silicone scavenger comprises a polymer having units selected from the group consisting of ##STR33## where R" and R'" are as defined in claim 1 to provide for a ratio of 1.5 to 3 of the sum of the R'" and (R") 2 N radicals per silicon atom in said polymer.

Claim 9

Dependent Claim 72 words

The composition of claim 2 wherein the silicone scavenger compound is a copolymer with up to 97 mole percent of ##STR34## units wherein the silicon-nitrogen units are selected from the group consisting of, ##STR35## where R" and R'", and c are as defined in claim 1 to provide for a ratio of the sum of R'" and (R") 2 N radicals per silicon atom of said copolymer of from 1.5 to 3.

Claim 10

Dependent Claim 35 words

The composition of claim 2 wherein the silicone scavenger compound is a cyclic polymer consisting of chemically combined (R'") 2 SiO units and ##STR36## units where R" and R'" are as defined in claim 1.

Claim 11

Dependent Claim 78 words

The composition of claim 2 wherein the silicone scavenger compound is selected from the group consisting of linear silazanes and cyclic silazanes having the formula ##STR37## where R" and R'" are as defined in claim 1, where n is 0 or an integer and is preferably 0 to 20, inclusive, and d is a whole number equal to 0 to 1, inclusive, and where d is equal to 0, n is preferably equal to 3 to 7, inclusive.

Claim 12

Dependent Claim 46 words

The composition of claim 2 wherein the silicone scavenger compound is a polysiloxane having the formula ##STR38## where R", R'" and n are as defined in claims 1 and 10 and Z is a member selected from the group consisting of R" and --Si(R'") 3 .

Claim 13

Dependent Claim 12 words

The composition of claim 2 wherein the silicone scavenger compound is hexamethyldisilazane.

Claim 14

Dependent Claim 12 words

The composition of claim 2 wherein the silicone scavenger compound is hexamethylcyclotrisilazane.

Claim 15

Dependent Claim 12 words

The composition of claim 2 wherein the silicone scavenger compound is octamethylcyclotetrasilazane.

Claim 16

Dependent Claim 19 words

The composition of claim 2 wherein the silicone scavenger compound has the formula [CF.sub.3 CH.sub.2 CH.sub.2 (CH.sub.3).sub.2 Si].sub.2 NH

Claim 17

Dependent Claim 17 words

The composition of claim 2 wherein the silicone scavenger compound has the formula [CF.sub.3 CH.sub.2 CH.sub.2 (CH.sub.3)SiNH].sub.3

Claim 18

Dependent Claim 26 words

The composition of claim 2 wherein the silicone scavenger compound is [CF 3 CH 2 CH 2 (CH 3 ) 2 Si] 2 N-CH 3 .

Claim 19

Dependent Claim 314 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time convertible to a tack-free elastomer comprising (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; (3) a stabilizing amount of silicone scavenger compound for hydroxy functional groups, selected from the group consisting of P1 (A) a silicon-nitrogen compound having the formula ##STR39## where Y is selected from R'" and R" 2 N-- and (B) a silicon nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structured units selected from the group consisting of units having the formula ##STR40## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR41## where the silicon atoms of said silicon nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon nitrogen polymer has a value of 1.5 to 3, inclusive, and R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive, and (4) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 20

Dependent Claim 314 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time convertible to a tack-free elastomer comprising (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; (3) a stabilizing amount of silicone scavenger compound for hydroxy functional groups, selected from the group consisting of P1 (A) a silicon-nitrogen compound having the formula ##STR39## where Y is selected from R'" and R" 2 N-- and (B) a silicon nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structured units selected from the group consisting of units having the formula ##STR40## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR41## where the silicon atoms of said silicon nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon nitrogen polymer has a value of 1.5 to 3, inclusive, and R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive, and (4) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 21

Dependent Claim 28 words

The composition of claim 18 wherein there is present from 0.1 to 10 parts by weight of the silicone scavenger per 100 parts by weight of the organpolysiloxane.

Claim 22

Dependent Claim 55 words

The composition of claim 19 wherein the silicone scavenger is a cyclic silazane polymer of chemically combined ##STR42## units where R", R'" are as defined in claim 18 to provide for a ratio of 1.5 to 3.0 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 23

Dependent Claim 65 words

The composition of claim 19 wherein the silicone scavenger is a silazane polymer having at least one unit selected from the group consisting of ##STR43## units, and ##STR44## units where R", R'" are as defined in claim 18 to provide for a ratio of 1.5 to 3.0 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 24

Dependent Claim 60 words

The composition of claim 19 wherein the silicone scavenger is a silazane polymer which is a linear polymer consisting essentially of ##STR45## units where R" and R'" are as defined in claim 18 to provide for a ratio of 1.5 to 3.0 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 25

Dependent Claim 66 words

The composition of claim 19 wherein the silicone scavenger comprises a silazane polymer having at least one unit selected from the group consisting of ##STR46## units and ##STR47## units where R" and R'" are as defined in claim 18 to provide for a ratio of 1.5 to 3 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 26

Dependent Claim 58 words

The composition of claim 19 wherein the silicone scavenger comprises a polymer having units selected from the group consisting of ##STR48## units where R" and R'" are as defined in claim 18 to provide for a ratio of 1.5 to 3 of the sum of the R'" and (R") 2 N radicals per silicon atom in said polymer.

Claim 27

Dependent Claim 73 words

The composition of claim 19 wherein the silicone scavenger compound is a copolymer with up to 97 mole percent of ##STR49## units wherein the silicon-nitrogen units are selected from the group consisting of ##STR50## units where R" and R'" and c are as defined in claim 18 to provide for a ratio of the sum of R'" and (R") 2 N radicals per silicon atom of said copolymer of from 1.5 to 3.

Claim 28

Dependent Claim 35 words

The composition of claim 19 wherein the silicone scavenger compound is a cyclic polymer consisting of chemically combined (R'") 2 SiO units and ##STR51## units where R" and R'" are as defined in claim 18.

Claim 29

Dependent Claim 78 words

The composition of claim 19 wherein the silicone scavenger compound is selected from the group consisting of linear silazanes and cyclic silazanes having the formula ##STR52## where R" and R'" are as defined in claim 18, where n is 0 or an integer and is preferably 0 to 20, inclusive, and d is a whole number equal to 0 to 1, inclusive, and where d is equal to 0, n is preferably equal to 3 to 7, inclusive.

Claim 30

Dependent Claim 44 words

The composition of claim 19 wherein the silicone scavenger compound is a polysiloxane having the formula ##STR53## where R", R'" and n are as defined in claim 18 and Z is a member selected from the group consisting of R" and --Si(R'") 3 .

Claim 31

Dependent Claim 95 words

A one-package, room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition in accordance with claim 1, where the polyalkoxy-terminated organopolysiloxane has the formula ##STR54## where R is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-3) monovalent substituted or unsubstituted hydrocarbon radical, b is a whole number equal to 0 or 1, and n is an integer having a value of from about 50 to about 2500 inclusive.

Claim 32

Dependent Claim 71 words

A room temperature vulcanizable composition in accordance with claim 1 having an effective amount of a cross-linking silane of the formula ##STR55## where R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, and b is a whole number equal to 0 or 1.

Claim 33

Dependent Claim 16 words

A room temperature vulcanizable composition in accordance with claim 1, where the silane scavenger is hexamethyldisilazane.

Claim 34

Dependent Claim 19 words

A room temperature vulcanizable composition in accordance with claim 1, which contains a tin compound as the condensation catalyst.

Claim 35

Dependent Claim 43 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable composition of claim 1 comprising a polymethoxy-terminated polydimethylsiloxane, an effective amount of a tin containing condensation catalyst, an effective amount of trimethoxysilylpropyltetramethylguanidine curing accelerator and a stabilizing amount of a hexamethyl disilazane.

Claim 36

Dependent Claim 15 words

An RTV composition in accordance with claim 32 in which the tin compound is dibutyltindiacetate.

Claim 37

Dependent Claim 13 words

An RTV composition in accordance with claim 32 containing a polymethoxysilane cross-linking agent.

Claim 38

Dependent Claim 393 words

A stable and substantially acid-free, one-package, room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition curable under ambient conditions to a tack-free elastomer over an extended period of time comprising on a weight basis (i) 100 parts of a substantially silanol-free polyalkoxy-siloxydiorganopolysiloxane of the formula ##STR56## (ii) 0 to 10 parts of a cross-linking polyalkoxysilane of the formula ##STR57## (iii) an effective amount of a condensation catalyst, (iv) a stabilizing amount of a silicone scavenger compound for hydroxy functional groups which is a silicon-nitrogen compound selected from the group consisting of (A) a silicon-nitrogen compound having the formula ##STR58## where Y is selected from R'" and R" 2 N- and (B) a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR59## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR60## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, where R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive, where R is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, and b is a whole number equal to 0 or 1, and n is an integer having a value of from about 50 to about 2500 inclusive; and (v) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 39

Dependent Claim 393 words

A stable and substantially acid-free, one-package, room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition curable under ambient conditions to a tack-free elastomer over an extended period of time comprising on a weight basis (i) 100 parts of a substantially silanol-free polyalkoxy-siloxydiorganopolysiloxane of the formula ##STR56## (ii) 0 to 10 parts of a cross-linking polyalkoxysilane of the formula ##STR57## (iii) an effective amount of a condensation catalyst, (iv) a stabilizing amount of a silicone scavenger compound for hydroxy functional groups which is a silicon-nitrogen compound selected from the group consisting of (A) a silicon-nitrogen compound having the formula ##STR58## where Y is selected from R'" and R" 2 N- and (B) a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR59## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR60## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, where R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive, where R is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, and b is a whole number equal to 0 or 1, and n is an integer having a value of from about 50 to about 2500 inclusive; and (v) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 40

Dependent Claim 20 words

A one-package room temperature vulcanizable composition in accordance with claim 36, where R, R 1 and R 2 are methyl.

Claim 41

Dependent Claim 19 words

A non-package room temperature vulcanizable composition in accordance with claim 36, where the condensation catalyst is a tin compound.

Claim 42

Dependent Claim 11 words

A stable and substantially acid-free, one-package, room temperature vulcanizable composition of

Claim 43

Dependent Claim 11 words

A stable and substantially acid-free, one-package, room temperature vulcanizable composition of

Claim 44

Dependent Claim 17 words

A one-package room temperature vulcanizable composition in accordance with claim 36 where the cross-linking polyalkoxysilane is methyltrimethoxysilane.

Claim 45

Dependent Claim 18 words

A room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition in accordance with claim 36 containing an effective amount of butyltetramethylguanidine.

Claim 46

Dependent Claim 52 words

A substantially acid-free room temperature vulcanizable composition of claim 36 comprising methyldimethoxysiloxy-terminated polymethylsiloxane, a reinforcing amount of octamethylcyclotetrasiloxane treated silica filler, an effective amount of dibutyltindiacetate condensation catalyst, a cure accelerating amount of trimethoxysilylpropyltetramethylguanidine and an excess of up to 3% by weight, based on the weight of the polydimethylsiloxane of hexamethyldisilazane.

Claim 47

Dependent Claim 35 words

A one-package, stable room temperature vulcanizable composition in accordance with claim 40, having as the scavenging silicon compound as excess of up to 3% by weight, based on the weight of the polydimethylsiloxane of hexamethylcyclotrisilazane.

Claim 48

Dependent Claim 28 words

The composition of claim 36 wherein there is present from 0.5 to 10 parts by weight of the silicone scavenger per 100 parts by weight of the organopolysiloxand.

Claim 49

Independent Claim 462 words

A method of making a one-package and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C., a room temperature vulcanizable material selected from (i) a mixture comprising (A) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR61## (B) from 1 to 10 parts of an alkoxy-functional cross-linking silane of the formula ##STR62## (C) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, (D) a stabilizing amount of silicone scavenger compound for hydroxy functional groups, selected from a silicon-nitrogen compound having the formula, ##STR63## where Y is selected from R'" and R" 2 N-- and a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR64## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR65## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, and R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive; and (E) an effective amount of a condensation catalyst, and (ii) a mixture comprising (A) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula ##STR66## (B) 0 to 10 parts of a cross-linking silane of the formula ##STR67## (C) an effective amount of a condensation catalyst (D) a stabilizing amount of the silicone scavenger for hydroxy functional groups of (i) (D), and (E) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, where b is 0 or 1, inclusive; R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) alkaryl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical.

Claim 50

Independent Claim 462 words

A method of making a one-package and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C., a room temperature vulcanizable material selected from (i) a mixture comprising (A) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR61## (B) from 1 to 10 parts of an alkoxy-functional cross-linking silane of the formula ##STR62## (C) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, (D) a stabilizing amount of silicone scavenger compound for hydroxy functional groups, selected from a silicon-nitrogen compound having the formula, ##STR63## where Y is selected from R'" and R" 2 N-- and a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR64## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR65## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, and R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive; and (E) an effective amount of a condensation catalyst, and (ii) a mixture comprising (A) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula ##STR66## (B) 0 to 10 parts of a cross-linking silane of the formula ##STR67## (C) an effective amount of a condensation catalyst (D) a stabilizing amount of the silicone scavenger for hydroxy functional groups of (i) (D), and (E) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, where b is 0 or 1, inclusive; R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) alkaryl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical.

Claim 51

Dependent Claim 28 words

The method of claim 45 wherein there is present from 0.5 to 10 by weight of the silicone scavenger compound per 100 parts by weight of the organopolysiloxane.

Claim 52

Dependent Claim 13 words

A method in accordance with claim 45 where the silicone scavenger is hexamethyldisilazane.

Claim 53

Dependent Claim 13 words

A method in accordance with claim 45 where the cross-linking silane is methyltrimethoxysilane.

Claim 54

Dependent Claim 15 words

A method in accordance with claim 45 where the condensation catalyst is a tin compound.

Claim 55

Dependent Claim 343 words

A mixture comprising (A) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR68## (B) 1 to 10 parts of a cross-linking silane of the formula ##STR69## (C) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, (D) a stabilizing amount of a silicone scavenger compound of hydroxy functional groups selected from a silicon-nitrogen compound having the formula ##STR70## where Y is selected from R'" and R" 2 N-- and a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR71## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR72## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valances of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, where R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive, and (E) an effective amount of a condensation catalyst, where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, b is a whole number equal to 0 or 1.

Claim 56

Dependent Claim 343 words

A mixture comprising (A) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR68## (B) 1 to 10 parts of a cross-linking silane of the formula ##STR69## (C) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, (D) a stabilizing amount of a silicone scavenger compound of hydroxy functional groups selected from a silicon-nitrogen compound having the formula ##STR70## where Y is selected from R'" and R" 2 N-- and a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR71## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR72## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valances of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, where R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive, and (E) an effective amount of a condensation catalyst, where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, b is a whole number equal to 0 or 1.

Claim 57

Dependent Claim 28 words

The composition of claim 50 wherein there is present from 0.5 to 10 parts by weight of the silicone scavenger per 100 parts by weight of the organopolysiloxane.

Claim 58

Dependent Claim 280 words

In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with a silanol-terminated organopolysiloxane and polyalkoxysilane cross-linking agent, characterized in the improvement which comprises adding to the organopolysiloxane mixture a stabilizing amount of a silicone scavenger compound which is a scavenger for hydroxy functional groups selected from (A) a silicon-nitrogen compound having the formula, ##STR73## where Y is selected from R'" and R" 2 N-- and (B) a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR74## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR75## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, where R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive and thereafter adding an effective amount of a condensation catalyst.

Claim 59

Dependent Claim 280 words

In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with a silanol-terminated organopolysiloxane and polyalkoxysilane cross-linking agent, characterized in the improvement which comprises adding to the organopolysiloxane mixture a stabilizing amount of a silicone scavenger compound which is a scavenger for hydroxy functional groups selected from (A) a silicon-nitrogen compound having the formula, ##STR73## where Y is selected from R'" and R" 2 N-- and (B) a silicon-nitrogen polymer comprising (1) from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR74## and (2) from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR75## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, where R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive and thereafter adding an effective amount of a condensation catalyst.

Claim 60

Dependent Claim 13 words

A method in accordance with claim 52 where the silane scavenger is hexamethyldisilazane.

Claim 61

Dependent Claim 17 words

A method in accordance with claim 52 using an effective amount of dibutyltindiacetate as the condensation catalyst.

Claim 62

Dependent Claim 296 words

In the method of making a substantially acid-free room temperature vulcanizable organopolyslixoane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals, characterized in the improvement which comprises adding to said polyalkoxy-terminated organopolysiloxane a stabilizing amount of a silicone scavenger compound for hydroxy functional groups, selected from (A) a silicon-nitrogen compound having the formula ##STR76## where Y is selected from R'" and R" 2 N-- and (B) a silicon-nitrogen polymer comprising from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR77## and from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR78## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, where R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive, an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition.

Claim 63

Dependent Claim 296 words

In the method of making a substantially acid-free room temperature vulcanizable organopolyslixoane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals, characterized in the improvement which comprises adding to said polyalkoxy-terminated organopolysiloxane a stabilizing amount of a silicone scavenger compound for hydroxy functional groups, selected from (A) a silicon-nitrogen compound having the formula ##STR76## where Y is selected from R'" and R" 2 N-- and (B) a silicon-nitrogen polymer comprising from 3 to 100 mole percent chemically combined structural units selected from the group consisting of units having the formula ##STR77## and from 0 to 97 mole percent chemically combined structural units represented by the formula ##STR78## where the silicon atoms of said silicon-nitrogen polymer are joined to each other by a member selected from an SiOSi linkage and a SiNR"Si linkage, the free valences of said silicon atoms other than those joined to oxygen to form a siloxy unit and nitrogen to form a silazy unit are joined to a member selected from an R'" radical and (R") 2 N radical, and where the ratio of the sum of said R'" radicals and said (R") 2 N radicals to the silicon atoms of said silicon-nitrogen polymer has a value of 1.5 to 3, inclusive, where R" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, and fluoroalkyl radicals, R'" is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and fluoroalkyl radicals, and c is a whole number equal to 0 to 3, inclusive, an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition.

Claim 64

Dependent Claim 28 words

The method of claim 55 where there is present from 0.5 to 10 parts by weight of the silicone scavenger per 100 parts by weight of the organopolysiloxane.

Claim 65

Dependent Claim 55 words

The method of claim 55 wherein the silicone scavenger is a cyclic silazane polymer of chemically comb ##STR79## units where R", R'" are as defined in claim 55 to provide for a ratio of 1.5 to 3.0 of the sum of the R'" and (R") 2 N radicals per silicon atom in said silazane polymer.

Claim 66

Dependent Claim 62 words

The method of claim 55 wherein the silicone scavenger is a linear silazane polymer having at least one unit selected from the group consisting of ##STR80## units where R", R'" are as defined in claim 55 to provide for a ratio of 1.5 to 3 of the sum of the R'" and (R") 2 N radicals per silicon atom in said polymer.

Claim 67

Dependent Claim 54 words

The method of claim 55 wherein the silicone scavenger comprises a linear polymer consisting essentially of ##STR81## units where R" and R'" are as defined in claim 55 to provide for a ratio of 1.5 to 3.0 of the sum of the R'" and (R") 2 N radicals per silicon atom in said polymer.

Claim 68

Dependent Claim 63 words

The method of claim 55 wherein the silicone scavenger compound comprises a silazane polymer having at least one unit selected from the group consisting of ##STR82## units where R" and R'" are as defined in claim 55 to provide for a ratio of 1.5 to 3 of the sum of the R'" and (R") 2 N radicals per silicon atom in said polymer.

Claim 69

Dependent Claim 59 words

The method of claim 55 wherein the silicone scavenger compound comprises a polymer having units selected from the group consisting of ##STR83## units where R" and R'" are as defined in claim 55 to provide for a ratio of 1.5 to 3 of the sum of the R'" and (R") 2 N radicals per silicon atom in said polymer.

Claim 70

Dependent Claim 72 words

The method of claim 55 wherein the silicone scavenger compound is a copolymer with up to 97 mole percent of ##STR84## units wherein the silicon-nitrogen units are selected from the group consisting of ##EQU2## where R" and R'" and c are as defined in claim 55 to provide for a ratio of the sum of R'" and (R") 2 N radicals per silicon atom of said copolymer of from 1.5 to 3.0.

Claim 71

Dependent Claim 35 words

The method of claim 55 wherein the silicone scavenger compound is a cyclic polymer consisting of chemically combined (R'") 2 SiO units and ##STR85## units where R" and R'" are as defined in claim 55.

Claim 72

Dependent Claim 78 words

The method of claim 55 wherein the silicone scavenger compound is selected from the group consisting of linear silazanes and cyclic silazanes having the formula ##STR86## where R" and R'" are as defined in claim 55 where n is 0 or an integer and is preferably 0 to 20, inclusive, and d is a whole number equal to 0 to 1, inclusive, and where d is equal to 0, n is preferably equal to 3 to 7, inclusive.

Claim 73

Dependent Claim 46 words

The method of claim 55 wherein the silicone scavenger compound is a polysiloxane having the formula ##STR87## where R", R'" and n are as defined in claim 55 and 64 and Z is a member selected from the group consisting of R" and --Si(R'") 3 .

Claim 74

Dependent Claim 12 words

The method of claim 55 wherein the silicone scavenger compound is hexamethyldisilazane.

Claim 75

Dependent Claim 148 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a tack-free elastomer comprising (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; (3) a stabilizing amount of silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR88## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from a C.sub.(1-8) monovalent hydrocarbon radicals, C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals, and g is a whole number that varies from 1 to 3, h is a whole number that varies 0 to 2 and the sum of h+g does not exceed 3.

Claim 76

Dependent Claim 148 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a tack-free elastomer comprising (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; (3) a stabilizing amount of silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR88## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from a C.sub.(1-8) monovalent hydrocarbon radicals, C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals, and g is a whole number that varies from 1 to 3, h is a whole number that varies 0 to 2 and the sum of h+g does not exceed 3.

Claim 77

Dependent Claim 12 words

The composition of claim 67 wherein the silicone scavenger is methyl di(methylamino)silane.

Claim 78

Dependent Claim 11 words

The composition of claim 67 wherein the silane scavenger is tris(mehylamino)silane.

Claim 79

Dependent Claim 12 words

The composition of claim 67 wherein the silane scavenger is methyl bis(diethylamino)silane.

Claim 80

Dependent Claim 169 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a tack-free elastomer comprising: (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; (3) a stabilizing amount of silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR89## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals R 20 is selected from C.sub.(1-8) monovalent hydrocarbon radicals, C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals, and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3; and (4) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 81

Dependent Claim 169 words

A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a tack-free elastomer comprising: (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; (3) a stabilizing amount of silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR89## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals R 20 is selected from C.sub.(1-8) monovalent hydrocarbon radicals, C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals, and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3; and (4) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 82

Dependent Claim 71 words

A room temperature vulcanizable composition in accordance with claim 67 having an effective amount of a cross-linking silane of the formula ##STR90## where R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, and b is a whole number equal to 0 or 1.

Claim 83

Dependent Claim 19 words

A room temperature vulcanizable composition in accordance with claim 72 which contains a tin compound as the condensation catalyst.

Claim 84

Dependent Claim 245 words

A stable and substantially acid-free, one-package room temperature vulcanizable polyalkoxy-terminated organpolysiloxane composition curable under ambient conditions to a tack-free elastomer over an extended period of time comprising on a weight basis, (i) 100 parts of a substantially silanol-free polyalkoxysiloxydiorganopolysiloxane of the formula ##STR91## (ii) 0 to 10 parts of a cross-linking polyalkoxysilane of the formula ##STR92## (iii) an effective amount of a condensation catalyst, and (iv) a stabilizing amount of a silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR93## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from C.sub.(1-8) monovalent hydrocarbon radicals C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of h+g does not exceed 3, where R is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical and b is a whole number equal to 0 or 1, and n is an integer having a value of from about 50 to about 2500 inclusive; (v) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 85

Dependent Claim 245 words

A stable and substantially acid-free, one-package room temperature vulcanizable polyalkoxy-terminated organpolysiloxane composition curable under ambient conditions to a tack-free elastomer over an extended period of time comprising on a weight basis, (i) 100 parts of a substantially silanol-free polyalkoxysiloxydiorganopolysiloxane of the formula ##STR91## (ii) 0 to 10 parts of a cross-linking polyalkoxysilane of the formula ##STR92## (iii) an effective amount of a condensation catalyst, and (iv) a stabilizing amount of a silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR93## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from C.sub.(1-8) monovalent hydrocarbon radicals C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of h+g does not exceed 3, where R is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R 2 is C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical and b is a whole number equal to 0 or 1, and n is an integer having a value of from about 50 to about 2500 inclusive; (v) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 86

Dependent Claim 54 words

A substantially acid-free room temperature vulcanizable composition of claim 74 comprising methyldimethoxysiloxy terminated polydimethylsiloxane, a reinforcing amount of octamethylcyclotetrasiloxane treated silica filler, an effective amount of dibutyltindiacetate condensation catalyst, a cure accelerating amount of trimethoxysilylpropyltetramethylguanidine and an excess of up to 3% by weight, based on the weight of the polydimethylsiloxane of methyl di(methylamino)silane.

Claim 87

Dependent Claim 23 words

A room temperature vulcanizable composition in accordance with claim 75 having up to 10 parts of methyltrimethoxysilane per 100 parts of the polydimethylsiloxane.

Claim 88

Independent Claim 347 words

A method of making a one-package and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C. a room temperature vulcanizable material selected from (i) a mixture comprising (A) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR94## (B) 1 to 10 parts of cross-linking silane of the formula ##STR95## (C) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; (D) a stabilizing amount of a silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR96## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from the group consisting of C.sub.(1-8) monovalent hydrocarbon radicals, C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3; and (E) an effective amount of a condensation catalyst, and (ii) a mixture comprising (A) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula ##STR97## (B) 0 to 10 parts of a cross-linking silane of the formula ##STR98## (C) an effective amount of a condensation catalyst (D) a stabilizing amount of the silicone scavenger for hydroxy functional groups of (i) (D), and (E) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) alkaryl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, b is a whole number equal to 0 or 1, n is an integer having a value of from about 50 to about 2500 inclusive.

Claim 89

Independent Claim 347 words

A method of making a one-package and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C. a room temperature vulcanizable material selected from (i) a mixture comprising (A) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR94## (B) 1 to 10 parts of cross-linking silane of the formula ##STR95## (C) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; (D) a stabilizing amount of a silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR96## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from the group consisting of C.sub.(1-8) monovalent hydrocarbon radicals, C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3; and (E) an effective amount of a condensation catalyst, and (ii) a mixture comprising (A) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula ##STR97## (B) 0 to 10 parts of a cross-linking silane of the formula ##STR98## (C) an effective amount of a condensation catalyst (D) a stabilizing amount of the silicone scavenger for hydroxy functional groups of (i) (D), and (E) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) alkaryl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, b is a whole number equal to 0 or 1, n is an integer having a value of from about 50 to about 2500 inclusive.

Claim 90

Dependent Claim 207 words

A mixture comprising (i) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR99## (ii) 1 to 10 parts of a cross-linking silane of the formula ##STR100## (iii) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, (iv) a stabilizing amount of a silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR101## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from C.sub.(1-8) monovalent hydrocarbon radicals C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals, and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3, (v) an effective amount of a condensation catalyst, and where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone, and alkylcyano radicals, or a C.sub.(1-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, b is a whole number equal to 0 or 1.

Claim 91

Dependent Claim 207 words

A mixture comprising (i) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR99## (ii) 1 to 10 parts of a cross-linking silane of the formula ##STR100## (iii) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, (iv) a stabilizing amount of a silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR101## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from C.sub.(1-8) monovalent hydrocarbon radicals C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals, and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3, (v) an effective amount of a condensation catalyst, and where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone, and alkylcyano radicals, or a C.sub.(1-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, b is a whole number equal to 0 or 1.

Claim 92

Dependent Claim 142 words

In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with a silanol-terminated organopolysiloxane and a polyalkoxysilane cross-linking agent, the improvement which comprises added to the organopolysiloxane mixture and a stabilizing amount of a silyl amine of the formula ##STR102## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from a C.sub.(1-8) monovalent hydrocarbon radical C.sub.(1-8) alkoxy radicals and fluoralkyl radicals, and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3, and thereafter adding an effective amount of condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition.

Claim 93

Dependent Claim 142 words

In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with a silanol-terminated organopolysiloxane and a polyalkoxysilane cross-linking agent, the improvement which comprises added to the organopolysiloxane mixture and a stabilizing amount of a silyl amine of the formula ##STR102## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from a C.sub.(1-8) monovalent hydrocarbon radical C.sub.(1-8) alkoxy radicals and fluoralkyl radicals, and g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3, and thereafter adding an effective amount of condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition.

Claim 94

Dependent Claim 188 words

In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals, the improvement which comprises adding to said polyalkoxy-terminated organopolysiloxane (1) a stabilizing amount of a silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR103## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from C.sub.(1-8) monovalent hydrocarbon radicals, C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals, g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3, and (2) an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition, and (3) optionally adding before or with the scavenger an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 95

Dependent Claim 188 words

In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals, the improvement which comprises adding to said polyalkoxy-terminated organopolysiloxane (1) a stabilizing amount of a silane scavenger for hydroxy functional groups which is a silyl amine of the formula ##STR103## where R" is a radical selected from the group consisting of hydrogen, and C.sub.(1-8) monovalent hydrocarbon radicals, R 20 is selected from C.sub.(1-8) monovalent hydrocarbon radicals, C.sub.(1-8) alkoxy radicals and fluoroalkyl radicals, g is a whole number that varies from 1 to 3, h is a whole number that varies from 0 to 2 and the sum of g+h does not exceed 3, and (2) an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition, and (3) optionally adding before or with the scavenger an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 96

Dependent Claim 30 words

A room-temperature vulcanizable composition in accordance with claim 30, where the cross-linking silane is methyltrimethoxysilane, the condensation catalyst is dibutyltindiacetate or dibutyltindilaurate, and the curing accelerator is di-n-hexylamine or di-n-butylamine.

Claim 97

Dependent Claim 31 words

A one-package room-temperature vulcanizable composition in accordance with claim 38, where the tin compound is dibutyltindiacetate or dibutyltindilaurate, the cross-linking silane is methyltrimethoxysilane and the curing accelerator is di-n-hexylamine or di-n-butylamine.

Claim 98

Dependent Claim 26 words

A one-package room-temperature vulcanizable composition in accordance with claim 40, where the tin compound is dibutyltindiacetate or dibutyltindilaurate, and the curing accelerator is di-n-hexylamine or di-n-butylamine.

Claim 99

Dependent Claim 25 words

A method in accordance with claim 36, using an effective amount of methyltrimethoxysilane, and an effective amount of di-n-hexylamine or di-n-butylamine as the curing accelerator.

Claim 100

Dependent Claim 17 words

A method in accordance with claim 55 using an effective amount of dibutyltindilaurate as the condensation catalyst.

Claim 101

Dependent Claim 25 words

A method in accordance with claim 85, using an effective amount of methyltrimethoxysilane and an effective amount of di-n-hexylamine or di-n-butylamine as the curing accelerator.

Claim 102

Dependent Claim 30 words

A room-temperature vulcanizable composition in accordance with claim 72, where the cross-linking silane is methyltrimethoxysilane, the condensation catalyst is dibutyltindiacetate or dibutyltindilaurate, and the curing accelerator is di-n-hexylamine or di-n-butylamine.

Claim 103

Dependent Claim 31 words

A one-package room-temperature vulcanizable composition in accordance with claim 74 where the tin compound is dibutyltindiacetate or dibutyltindilaurate, the cross-linking silane is methyltrimethoxysilane and the curing accelerator is di-n-hexylamine or di-n-butylamine.

Claim 104

Dependent Claim 25 words

A method in accordance with claim 80, using an effective amount of methyltrimethoxysilane, and an effective amount of di-n-hexylamine or di-n-butylamine as the curing accelerator.

Claim 105

Dependent Claim 17 words

A method in accordance with claim 80, using an effective amount of dibutyltindilaurate as the condensation catalyst.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-11-21	1987-05-23	1987-11-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-11-21	1991-05-23	1991-11-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-11-21	1995-05-23	1995-11-22	$7700.00	Window Closed / Lapsed

Scavengers for one-component alkoxy-functional RTV compositions and processes

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag