Olefinic siloxanes as platinum inhibitors

Claim 2

A polyorganosiloxane consisting essentially of from 3 to 10 siloxane units in which a. at least one siloxane unit is selected from the group consisting of RHSiO and R 2 HSiO 0 . 5 and b. at least one siloxane unit is selected from the group consisting of ##EQU20## and ##EQU21## where the sum of siloxane units in (a) and (b) is equal to at least three siloxane units, c. any remaining siloxane units being selected from the group consisting of R 3 SiO 0 . 5, SiO 2 and RSiO 1 . 5 where each siloxane unit of (c) does not exceed three siloxane units, where R is a monovalent radical selected from the group consisting of hydrocarbon radicals and perfluoroalkylethylene radicals, both having no more than six carbon atoms and R' is a monovalent hydrocarbon radical having a secondary or tertiary hydroxy substitution and having no more than ten carbon atoms.

Claim 3

The polyorganosiloxane of claim 1 in which there are at least 5 siloxane units, (a) is RHSiO, (b) is ##EQU22## c. is two siloxane units of R 3 SiO 0 . 5 and R' has tertiary hydroxy substitution.

Claim 4

The polyorganosiloxane of claim 2 in which R' is -C(CH 3 ) 2 OH.

Claim 5

The polyorganosiloxane of claim 3 in which R is methyl.

Claim 6

The polyorganosiloxane of claim 4 in which there are two RHSiO units and one ##EQU23## unit.

Claim 7

The polyorganosiloxane of claim 4 in which there are one RHSiO unit and two ##EQU24## units.

Claim 8

A curable organosilicon composition comprising 1. an organosilicon polymer having an average of from one to three groups per silicon atom selected from the group consisting of monovalent hydrocarbon radicals, aliphatic-unsaturation free monovalent halohydrocarbon radicals, and cyanoalkyl radicals, there being an average per molecule of (1) of at least two monovalent hydrocarbon radicals containing aliphatic unsaturation, the remaining valences of the silicon atoms of said organosilicon polymer being satisfied by divalent radicals selected from the group consisting of divalent oxygen atoms, divalent hydrocarbon radicals, divalent hydrocarbon ether radicals and divalent haloarylene radicals, said divalent radicals linking silicon atoms, 2. an organosilicon compound containing silicon-bonded hydrogen atoms, there being in addition an average of up to two monovalent organic radicals per silicon atom selected from the group consisting of monovalent hydrocarbon radicals free of aliphatic unsaturation, monovalent halohydrocarbon radicals free of aliphatic unsaturation and cyanoalkyl radicals, the remaining valences of the silicon atoms being satisfied by divalent radicals selected from the group consisting of divalent oxygen atoms, divalent hydrocarbon radicals free of aliphatic unsaturation, divalent hydrocarbon ether radicals and divalent haloarylene radicals, said divalent radicals linking silicon atoms, there being an average of at least two silicon-bonded hydrogen atoms per molecule of (2), the sum of the average number of aliphatic unsaturated monovalent radicals per molecule of (1) and the average number of silicon-bonded hydrogen atoms per molecule of (2) being at least 4, 3. a platinum catalyst in an amount of at least 0.1 part by weight platinum per one million parts by weight of the combined weights of (1) and (2), and 4. a polyorganosiloxane in an amount to effectively retard the cure at ambient temperatures, said polyorganosiloxane consisting essentially of from 3 to 10 siloxane units in which a. at least one siloxane unit is selected from the group consisting of RHSiO and R 2 HSiO 0 . 5 and b. at least one siloxane unit is selected from the group consisting of ##EQU25## where the sum of siloxane units in (a) and (b) is equal to at least three siloxane units, c. any remaining siloxane units being selected from the group consisting of R 3 SiO 0 . 5, SiO 2 and RSiO 1 . 5 where each siloxane unit of (c) does not exceed three siloxane units, where R is a monovalent radical selected from the group consisting of hydrocarbon radicals and perfluoroalkylethylene radicals, both having no more than six carbon atoms and R' is a monovalent hydrocarbon radical having a secondary or tertiary hydroxy substitution and having no more than ten carbon atoms.

Claim 9

A curable organosilicon composition comprising 1. an organosilicon polymer having an average of from one to three groups per silicon atom selected from the group consisting of monovalent hydrocarbon radicals, aliphatic-unsaturation free monovalent halohydrocarbon radicals, and cyanoalkyl radicals, there being an average per molecule of (1) of at least two monovalent hydrocarbon radicals containing aliphatic unsaturation, the remaining valences of the silicon atoms of said organosilicon polymer being satisfied by divalent radicals selected from the group consisting of divalent oxygen atoms, divalent hydrocarbon radicals, divalent hydrocarbon ether radicals and divalent haloarylene radicals, said divalent radicals linking silicon atoms, 2. an organosilicon compound containing silicon-bonded hydrogen atoms, there being in addition an average of up to two monovalent organic radicals per silicon atom selected from the group consisting of monovalent hydrocarbon radicals free of aliphatic unsaturation, monovalent halohydrocarbon radicals free of aliphatic unsaturation and cyanoalkyl radicals, the remaining valences of the silicon atoms being satisfied by divalent radicals selected from the group consisting of divalent oxygen atoms, divalent hydrocarbon radicals free of aliphatic unsaturation, divalent hydrocarbon ether radicals and divalent haloarylene radicals, said divalent radicals linking silicon atoms, there being an average of at least two silicon-bonded hydrogen atoms per molecule of (2), the sum of the average number of aliphatic unsaturated monovalent radicals per molecule of (1) and the average number of silicon-bonded hydrogen atoms per molecule of (2) being at least 4, 3. a platinum catalyst in an amount of at least 0.1 part by weight platinum per one million parts by weight of the combined weights of (1) and (2), and 4. a polyorganosiloxane in an amount to effectively retard the cure at ambient temperatures, said polyorganosiloxane consisting essentially of from 3 to 10 siloxane units in which a. at least one siloxane unit is selected from the group consisting of RHSiO and R 2 HSiO 0 . 5 and b. at least one siloxane unit is selected from the group consisting of ##EQU25## where the sum of siloxane units in (a) and (b) is equal to at least three siloxane units, c. any remaining siloxane units being selected from the group consisting of R 3 SiO 0 . 5, SiO 2 and RSiO 1 . 5 where each siloxane unit of (c) does not exceed three siloxane units, where R is a monovalent radical selected from the group consisting of hydrocarbon radicals and perfluoroalkylethylene radicals, both having no more than six carbon atoms and R' is a monovalent hydrocarbon radical having a secondary or tertiary hydroxy substitution and having no more than ten carbon atoms.

Claim 10

The curable organosilicon composition according to claim 7 wherein (1) is a triorganosiloxy-endblocked polydiorganosiloxane having a viscosity of at least 100 cs. at 25°C.

Claim 11

The curable organosilicon composition according to claim 8 wherein the organo radicals of (1) are methyl and vinyl.

Claim 12

The curable organosilicon composition according to claim 8 wherein the organo radicals of (1) are methyl, phenyl and vinyl.

Claim 13

The curable organosilicon composition according to claim 7 wherein the polyorganosiloxane (4) is present in an amount of at least one mole of polyorganosiloxane (4) per mole of platinum.

Claim 14

The curable organosiloxane composition according to claim 11 wherein the polyorganosiloxane (4) is present in an amount of 0.5 to 3 weight percent based on the total weight of the composition.

Claim 15

The curable organosilicon composition according to claim 7 wherein the polyorganosiloxane (4) has at least 5 siloxane units, (a) is RHSiO, (b) is ##EQU26## c. is two siloxane units of R 3 SiO 0 . 5 and R' has tertiary hydroxy substitution.

Claim 16

The curable organosilicon composition according to claim 13 in which R' is -C(CH 3 ) 2 OH.

Claim 17

The curable organosilicon composition according to claim 14 in which R is methyl.

Claim 18

The curable organosilicon composition according to claim 15 in which there are two RHSiO units and one ##EQU27## unit.

Claim 19

The curable organosilicon composition according to claim 15 in which there are one RHSiO unit and two ##EQU28## units.

Claim 20

The curable organosilicon composition according to claim 8 wherein the polyorganosiloxane (4) is present in an amount of at least one mole of polyorganosiloxane (4) per mole of platinum.

Claim 21

The curable organosilicon composition according to claim 18 wherein the polyorganosiloxane (4) is present in an amount of 0.5 to 3 weight percent based on the total weight of the composition.

Claim 22

The curable organosilicon composition according to claim 19 wherein the polyorganosiloxane (4) has at least 5 siloxane units, (a) is RHSiO, (b) is ##EQU29## c. is two siloxane units of R 3 SiO 0 . 5 and R' has tertiary hydroxy substitution.

Claim 23

The curable organosilicon composition according to claim 20 in which R' is -C(CH 3 ) 2 OH.

Claim 24

The curable organosilicon composition according to claim 21 in which R is methyl.

Claim 25

The curable organosilicon composition according to claim 22 in which there are two RHSiO units and one ##EQU30## unit.

Claim 26

The curable organosilicon composition according to claim 22 in which there are one RHSiO unit and two ##EQU31## units.

Claim 27

The curable organosilicon composition according to claim 23 in which the radicals of (1) are methyl, phenyl and vinyl.

Claim 28

The curable organosilicon composition according to claim 24 in which the radicals of (1) are methyl, phenyl and vinyl.