EP0069256A2
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EP
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One package, stable, moisture curable, polyalkoxy-terminated organopolysiloxane compositions and method for making
Assignee: General Electric Co
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Filing: 1982-06-17
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Granted: —
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Expires: 2002-06-17
Abstract
Abstract Stable, substantially acid-free, one package moisture curable polyalkoxy-terminated organopolysiloxane compositions are provided having a condensation catalyst such as a tin compound. A method for making the aforesaid moisture curable organopolysiloxane compositions, is also provided.
Inventors
- 👤 Mary Ann White
- 👤 Robert Augustine Smith
- 👤 Melvin Dale Beers
- 👤 Roger Thomas Swiger
- 👤 Gary Morgan Lucas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:59
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/29; C08K5/31; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/18; C08L; C08L83/00; C08L83/04; C08G77/20; C08G77/22; C08G77/26; C08G77/28; C08G77/60; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
206 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 having the formula where R l is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl; alkylether, alkylester, alkylketone, and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, e is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c + f is equal to 1 to 4 inclusive; and where X is enoxy or amido, (4) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 2
Dependent Claim
206 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 having the formula where R l is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl; alkylether, alkylester, alkylketone, and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, e is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c + f is equal to 1 to 4 inclusive; and where X is enoxy or amido, (4) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 3
Dependent Claim
142 words
The composition of claim 1 wherein the silane has the formula where R1 is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester,.alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) ] monovalent sub-. stituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals; and, a is an integer equal to 1 to 2 inclusive, b is a whole number equal to 0 to 1 inclusive, and the sum of b+a is equal to 1 to 2 inclusive and the silane is both the silane scavenger for hydroxy functional groups and a polyalkoxysilane cross-linking agent for terminating the silicon atom at each organopolysiloxane chain end with at least two alkoxy radicals.
Claim 4
Dependent Claim
198 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 having the formula where R 1 is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylesterr alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c + f is equal to I to 4 inclusive; and (4) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 5
Dependent Claim
198 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 having the formula where R 1 is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylesterr alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c + f is equal to I to 4 inclusive; and (4) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 6
Dependent Claim
147 words
A one-package, room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition in accordance with claim 1, where the polyalkoxy-terminated organopolysiloxane has the formula where R is a C (1-3) monovalent substituted or unsubstituted hydrocarbon radical, R l is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, b is a whole number equal to 0 or 1, e is a whole number equal to 0 or 1 inclusive and the sum of b + e is equal to 0 or 1 inclusive, and n is an integer having a value of from about 50 to about 2500 inclusive.
Claim 7
Dependent Claim
72 words
A room temperature vulcanizable composition in accordance with claim 1 having an effective amount of a cross-linking silane of the formula where R 1 is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, and b is a whole number equal to 0 or 1.
Claim 8
Dependent Claim
17 words
A room temperature vulcanizable composition in accordance with claim 1, where the silane scavenger is methyldimethoxy(N-methylacetamido) silane.
Claim 9
Dependent Claim
18 words
A room temperature vulcanizable composition in accordance with claim 1, which contains a tin'compound as the condensation catalyst.
Claim 10
Dependent Claim
28 words
A room temperature vulcanizable composition in accordance with claim 4, where R, R 1 and R2 are methyl and which has a tin compound as a condensation catalyst.
Claim 11
Dependent Claim
30 words
A room temperature vulcanizable composition in accordance with claim 1, containing an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 12
Dependent Claim
32 words
A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable composition comprising a polymethoxy-terminated polydimethylsiloxane, an effective amount of a tin containing condensation catalyst, and a stabilizing amount of a polymethoxydi-n-hexylaminosilane.
Claim 13
Dependent Claim
32 words
A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable composition comprising a polymethoxy-terminated polydimethylsiloxane, an effective amount of a tin containing condensation catalyst, and a stabilizing amount of a polymethoxydi-n-hexylaminosilane.
Claim 14
Dependent Claim
40 words
A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable composition 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 polymethoxy- acetamidosilane.
Claim 15
Dependent Claim
40 words
A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable composition 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 polymethoxy- acetamidosilane.
Claim 16
Dependent Claim
11 words
An RTV composition in accordance with . claim 10 containing dibutyltindiacetate.
Claim 17
Dependent Claim
13 words
An RTV composition in accordance with claim 10 containing a polymethoxysilane cross-linking agent.
Claim 18
Dependent Claim
265 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 polyalkoxysiloxydiorganopolysiloxane of the formula (ii) 0 to 10 parts of a cross-linking polyalkoxysilane of the formula (iii) an effective amount of a condensation catalyst, and (iv) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula where R is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, R 1 is a C (1-6) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of am-ido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, b is a whole number equal to 0 or 1, e is a whole number equal to 0 to 1 inclusive, and the sum of b + e is equal to 0 or 1 inclusive, and n is an integer having a value of from about 50 to about 2500 inclusive, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c + f is equal to 1 to 4 inclusive; and (v) where X is enoxy, 0.1 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof
Claim 19
Dependent Claim
265 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 polyalkoxysiloxydiorganopolysiloxane of the formula (ii) 0 to 10 parts of a cross-linking polyalkoxysilane of the formula (iii) an effective amount of a condensation catalyst, and (iv) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula where R is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, R 1 is a C (1-6) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of am-ido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, b is a whole number equal to 0 or 1, e is a whole number equal to 0 to 1 inclusive, and the sum of b + e is equal to 0 or 1 inclusive, and n is an integer having a value of from about 50 to about 2500 inclusive, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c + f is equal to 1 to 4 inclusive; and (v) where X is enoxy, 0.1 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof
Claim 20
Dependent Claim
32 words
A room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition in accordance with claim 14 containing an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 21
Dependent Claim
20 words
A one-package room temperature vulcanizable composition in accordance with claim 14, where R, R 1 and R 2 are methyl.
Claim 22
Dependent Claim
19 words
A one-package room temperature vulcanizable composition in accordance with claim 14, where the condensation catalyst is a tin compound.
Claim 23
Dependent Claim
79 words
A stable and substantially acid-free, one-package, room temperature vulcanizable composition comprising a polymethoxy-terminated polydimethylsiloxane, a polymethoxysilane, an effective amount of a.curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof., an effective amount of a tin compound condensation catalyst, and a stabilizing amount of a silane scavenger for hydroxy functional groups having at least one hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanate, oximato, thioisocyanato and ureido radicals.
Claim 24
Dependent Claim
79 words
A stable and substantially acid-free, one-package, room temperature vulcanizable composition comprising a polymethoxy-terminated polydimethylsiloxane, a polymethoxysilane, an effective amount of a.curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof., an effective amount of a tin compound condensation catalyst, and a stabilizing amount of a silane scavenger for hydroxy functional groups having at least one hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanate, oximato, thioisocyanato and ureido radicals.
Claim 25
Dependent Claim
16 words
A one-package room temperature vulcanizable ccmposition in accordance with claim 18, where the polymethoxysilane is methyltrimethoxysilane.
Claim 26
Dependent Claim
14 words
A one-package RTV in accordance with claim 18, where the substituted guanidine is butyltetramethylguanidine.
Claim 27
Dependent Claim
15 words
A one-package RTV in accordance with claim 18, where the organic amine is a dialkylamine.
Claim 28
Dependent Claim
49 words
A substantially acid-free room temperature vulcanizable composition comprising methyldimethoxysiloxy terminated polydimethylsiloxane, a'reinforcing amount of oetamethylcyclotetrasiloxane 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 methyldimethoxy-N-methylacetamidosilane.
Claim 29
Dependent Claim
49 words
A substantially acid-free room temperature vulcanizable composition comprising methyldimethoxysiloxy terminated polydimethylsiloxane, a'reinforcing amount of oetamethylcyclotetrasiloxane 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 methyldimethoxy-N-methylacetamidosilane.
Claim 30
Dependent Claim
38 words
A one-package, stable room temperature vulcanizable composition in accordance with claim 22, having as the silane in place of the acetamido an excess of up to 3% by weight, based on the weight of the polydimethylsiloxane of methyldimethoxyisopropenoxysilane.
Claim 31
Dependent Claim
23 words
An room temperature vulcanizable composition in accordance with claim 22 having up to 10 parts of methyltrimethoxysilane per 100 parts of the polydimethylsiloxane.
Claim 32
Dependent Claim
22 words
An roan temperature vulcanizable composition in accordance with claim 22 having an effective amount of di-n-hexylamine curing accelerator in place of trimethoxysilylpropyltetramethylguanidine.
Claim 33
Independent Claim
411 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 (b) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula (c) 0 to 10 parts of cross-linking silane of the formula (d) an effective amount of a condensation catalyst, and (e) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; and (ii) a mixture comprising (a) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula (iii) 0 to 10 parts of a cross-linking silane of the formula, (iv) an effective amount of a condensation catalyst (v) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula and (vi) 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 (1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) alkaryl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, a is an integer equal to 1 or 2, b is a whole number equal to 0 or 1, and the sum of a + b is equal to 1 or 2, e is a whole number-equal to 0 or 1 and the sum of b + e is equal to 0 to 1, n is an integer having a value of from about 50 to about 2500 inclusive, e is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of e + f is equal to 1 to 4 inclusive, and in either mixture where X is enoxy, there is also added, before or with the scavenger, 0.1 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 34
Independent Claim
411 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 (b) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula (c) 0 to 10 parts of cross-linking silane of the formula (d) an effective amount of a condensation catalyst, and (e) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; and (ii) a mixture comprising (a) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula (iii) 0 to 10 parts of a cross-linking silane of the formula, (iv) an effective amount of a condensation catalyst (v) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula and (vi) 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 (1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) alkaryl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, a is an integer equal to 1 or 2, b is a whole number equal to 0 or 1, and the sum of a + b is equal to 1 or 2, e is a whole number-equal to 0 or 1 and the sum of b + e is equal to 0 to 1, n is an integer having a value of from about 50 to about 2500 inclusive, e is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of e + f is equal to 1 to 4 inclusive, and in either mixture where X is enoxy, there is also added, before or with the scavenger, 0.1 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 35
Dependent Claim
16 words
A method in accordance with claim 26, where R, R 1 and R 2 are methyl.
Claim 36
Dependent Claim
23 words
A method in accordance with claim 26, where the curing accelerator is selected from the group consisting of silylated guanidine and alkyl guanidine.
Claim 37
Dependent Claim
15 words
A method in accordance with claim 26, where the scavenging silane is a polymethoxyacetamidosi- lane.
Claim 38
Dependent Claim
13 words
A method in accordance with claim 26, where the cross-linking silane is methyltrimethoxysilane.
Claim 39
Dependent Claim
15 words
A method in accordance with claim 26, where the condensation catalyst is a tin compound.
Claim 40
Dependent Claim
14 words
A method in accordance with claim 29, where the silane scavenger is methyldimethoxy(N-methylacetamido) silane.
Claim 41
Dependent Claim
208 words
A mixture comprising (a) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula (b) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula (c) 0 to 10 parts of cross-linking silane of the formula (d) an effective. amount of a condensation catalyst, 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 (1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R l is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, a is an integer equal to 1 or 2, b is a whole number equal to 0 or 1, and the sum of a + b is equal to 1 or 2; and where X is enoxy, 0.1 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 42
Dependent Claim
208 words
A mixture comprising (a) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula (b) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula (c) 0 to 10 parts of cross-linking silane of the formula (d) an effective. amount of a condensation catalyst, 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 (1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R l is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, a is an integer equal to 1 or 2, b is a whole number equal to 0 or 1, and the sum of a + b is equal to 1 or 2; and where X is enoxy, 0.1 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 43
Dependent Claim
214 words
In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane compositions 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 adding to the silanol-terminated organopolysiloxane a stabilizing amount of a polyalkoxysilane which is both a scavenger for hydroxy functional groups and a cross-linking agent of the formula where R l is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, a is an integer equal to 1 or 2, b is an integer equal to 0 or 1, and the sum of a + b is equal to 1 or 2, and thereafter adding an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition, and where X is enoxy, 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 44
Dependent Claim
214 words
In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane compositions 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 adding to the silanol-terminated organopolysiloxane a stabilizing amount of a polyalkoxysilane which is both a scavenger for hydroxy functional groups and a cross-linking agent of the formula where R l is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, a is an integer equal to 1 or 2, b is an integer equal to 0 or 1, and the sum of a + b is equal to 1 or 2, and thereafter adding an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition, and where X is enoxy, 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 45
Dependent Claim
13 words
A method in accordance with claim 34, where the silane scavenger is methyldimethoxy-N-methylacetamidosilane.
Claim 46
Dependent Claim
13 words
A method in accordance with claim 34, where the silane scavenger is methyldimethoxyisopropenoxysilane.
Claim 47
Dependent Claim
13 words
A method in accordance with claim 34, where the silane scavenger is methyltriisopropenoxysilane.
Claim 48
Dependent Claim
17 words
A method in accordance with claim 34 using an effective amount of dibutyltindiacetate as the condensation catalyst.
Claim 49
Dependent Claim
220 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 of the formula where Rl is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent'substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive, and the sum of c + f is equal to 1 to 4 inclusive, and (2) an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition, and (3) where X is enoxy, 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 50
Dependent Claim
220 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 of the formula where Rl is a C (1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C (7-13) aralkyl radical, R 2 is a C (1-13) monovalent'substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive, and the sum of c + f is equal to 1 to 4 inclusive, and (2) an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition, and (3) where X is enoxy, 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 51
Dependent Claim
13 words
A method in accordance with claim 39, where the silane scavenger is methyldimethoxy-N-methylacetamidosilane.
Claim 52
Dependent Claim
13 words
A method in accordance with claim 39, where the silane scavenger is methyldimethoxyisopropenoxysilane.
Claim 53
Dependent Claim
20 words
A method in accordance with claim 39, utilizing a stabilizing amount of methyltriisopropenoxysilane and an effective amount of methyl- tximethoxysilane.
Claim 54
Dependent Claim
18 words
A method in accordance with claim 39, using an effective amount of dibutyltindiacetate as the condensation catalyst. WAT:kab
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