Accelerated inhibited platinum-catalyzed organosilicon compositions

Claim 1

A reactive composition obtained by mixing components comprising (a) an organopolysiloxane component having from 1 to 3 organic groups per silicon atom, the organic radicals of which are independently selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radicals, at least two of said organic radicals per molecule of said organopolysiloxane bearing aliphatic unsaturation which is reactive in a platinum-catalyzed hydrosilylation reaction, (b) an organohydrogenpolysiloxane component having-up to 2 organic radicals per silicon atom, the organic radicals of which are free of aliphatic unsaturation and are independently selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radicals, there being an average of at least two silicon-bonded hydrogen radicals per molecule of said organohydrogenpolysiloxane which are reactive in a platinum-catalyzed hydrosilylation reaction, (c) a platinum-containing component in sufficient amount to catalyze a hydrosilylation reaction of said aliphatically unsaturated radicals with said silicon-bonded hydrogen radicals, (d) an inhibitor component in sufficient amount to decrease the rate of the catalyzed hydrosilylation reaction at room temperature, and characterized in that the components so mixed include (e) an accelerator component in sufficient amount to increase the rate of the inhibited hydrosilylation reaction at 180°F., said accelerator component being selected from the group consisting of saturated halohydrocarbons having an atmospheric boiling point of from 75°F to 250°F.

Claim 7

A method for forming a configuration characterized by (i) mixing components comprising (a) an organopolysiloxane component having from 1 to 3 organic radicals per silicon atom, the organic radicals of which are independently selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radicals, at least two of said organic radicals per molecule of said organopolysiloxane bearing aliphatic unsaturation which is reactive in a platinum-catalyzed hydrosilylation reaction, (b) an organohydrogenpolysiloxane component having up to 2 organic radicals per silicon atom, the organic radicals of which are free of aliphatic unsaturation and are independently selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radicals, there being an average of at least two silicon-bonded hydrogen radicals per molecule of said organohydrogenpolysiloxane which are reactive in a platinum-catalyzed hydrosilylation reaction, (c) a platinum-containing component in sufficient amount to catalyze a hydrosilylation reaction of said aliphatically unsaturated radicals with said silicon-bonded hydrogen radicals, (d) an inhibitor component in sufficient amount to decrease the rate of the catalyzed hydrosilylation reaction at room temperature, and (e) an accelerator component in sufficient amount to increase the rate of the inhibited hydrosilylation reaction at 180°F., said accelerator component being selected from the group consisting of saturated halohydrocarbons having an atmospheric boiling point of from 75°F. to 250°F., to provide a reactive composition, (ii) configuring the composition of (i) in a desired configuration, and (iii) heating the configured composition to accelerate said hydrosilylation reaction.

Claim 8

A method for forming a configuration characterized by (i) mixing components comprising (a) an organopolysiloxane component having from 1 to 3 organic radicals per silicon atom, the organic radicals of which are independently selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radicals, at least two of said organic radicals per molecule of said organopolysiloxane bearing aliphatic unsaturation which is reactive in a platinum-catalyzed hydrosilylation reaction, (b) an organohydrogenpolysiloxane component having up to 2 organic radicals per silicon atom, the organic radicals of which are free of aliphatic unsaturation and are independently selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radicals, there being an average of at least two silicon-bonded hydrogen radicals per molecule of said organohydrogenpolysiloxane which are reactive in a platinum-catalyzed hydrosilylation reaction, (c) a platinum-containing component in sufficient amount to catalyze a hydrosilylation reaction of said aliphatically unsaturated radicals with said silicon-bonded hydrogen radicals, (d) an inhibitor component in sufficient amount to decrease the rate of the catalyzed hydrosilylation reaction at room temperature, and (e) an accelerator component in sufficient amount to increase the rate of the inhibited hydrosilylation reaction at 180°F., said accelerator component being selected from the group consisting of saturated halohydrocarbons having an atmospheric boiling point of from 75°F. to 250°F., to provide a reactive composition, (ii) configuring the composition of (i) in a desired configuration, and (iii) heating the configured composition to accelerate said hydrosilylation reaction.

Claim 9

A method for coating a substrate, said method characterized by (i) mixing components comprising (a) an organopolysiloxane component having the formula (CH 2 =CH)(CH 3 )(R')SiO[(CH 3 ) 2 SiO] a -[(CH 2 =CH)(CH 3 )SiO] b Si(R')(CH 3 )(CH=CH 2 ) wherein each R' denotes, independently, a methyl radical or a phenyl radical, a denotes a number having an average value of from 40 to 600 and b denotes a number having an average value of from 0 to 0.1a, (b) an organohydrogenpolysiloxane component consisting essentially of at least 40 percent by weight of an organohydrogenpolysiloxane having the formula (CH 3 ) 3 SiO[(CH 3 )(H)SiO] c Si(CH 3 ) 3 wherein c denotes a number having an average value of from 30 to 70, the remainder of said organohydrogenpolysiloxane component consisting essentially of an organohydrogenpolysiloxane having the formula (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] d [(CH 3 )(H)SiO] e Si(CH 3 ) 3 wherein d denotes a number having an average value of approximately 3 and e denotes a number having an average value of approximately 5, (c) a platinum-containing component comprising the reaction product of H 2 PtC1 6 .6H 2 0 with E(CH 2 =CH)(CH 3 ) 2 Si] 2 0, said platinum-containing component being present in sufficient amount to provide from 50 to 250 parts by weight of platinum for every one million parts by weight of the organopolysiloxane component (a), (d) an inhibitor component in sufficient amount to increase the room-temperature gel time of the mixture of components (a) plus (b) plus (c) and (e) an accelerator component in sufficient amount to decrease the cure time of the mixture of components (a) plus (b) plus (c) plus (d) at 180°F., said accelerator component being selected from the group consisting of saturated halohydrocarbons having an atmospheric boiling point of from 70°F to 250°F., there being in the resulting mixture from 0.9 to 2.1 silicon-bonded hydrogen radicals for every silicon-bonded vinyl radical, to provide a curable composition, (ii) applying said curable composition to said substrate, and (iii) heating the applied composition to cure said applied composition.

Claim 10

A method for coating a substrate, said method characterized by (i) mixing components comprising (a) an organopolysiloxane component having the formula (CH 2 =CH)(CH 3 )(R')SiO[(CH 3 ) 2 SiO] a -[(CH 2 =CH)(CH 3 )SiO] b Si(R')(CH 3 )(CH=CH 2 ) wherein each R' denotes, independently, a methyl radical or a phenyl radical, a denotes a number having an average value of from 40 to 600 and b denotes a number having an average value of from 0 to 0.1a, (b) an organohydrogenpolysiloxane component consisting essentially of at least 40 percent by weight of an organohydrogenpolysiloxane having the formula (CH 3 ) 3 SiO[(CH 3 )(H)SiO] c Si(CH 3 ) 3 wherein c denotes a number having an average value of from 30 to 70, the remainder of said organohydrogenpolysiloxane component consisting essentially of an organohydrogenpolysiloxane having the formula (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] d [(CH 3 )(H)SiO] e Si(CH 3 ) 3 wherein d denotes a number having an average value of approximately 3 and e denotes a number having an average value of approximately 5, (c) a platinum-containing component comprising the reaction product of H 2 PtC1 6 .6H 2 0 with E(CH 2 =CH)(CH 3 ) 2 Si] 2 0, said platinum-containing component being present in sufficient amount to provide from 50 to 250 parts by weight of platinum for every one million parts by weight of the organopolysiloxane component (a), (d) an inhibitor component in sufficient amount to increase the room-temperature gel time of the mixture of components (a) plus (b) plus (c) and (e) an accelerator component in sufficient amount to decrease the cure time of the mixture of components (a) plus (b) plus (c) plus (d) at 180°F., said accelerator component being selected from the group consisting of saturated halohydrocarbons having an atmospheric boiling point of from 70°F to 250°F., there being in the resulting mixture from 0.9 to 2.1 silicon-bonded hydrogen radicals for every silicon-bonded vinyl radical, to provide a curable composition, (ii) applying said curable composition to said substrate, and (iii) heating the applied composition to cure said applied composition.

Claim 11

A method according to claims 5 or 6, wherein from 0.01 to 1.0 parts by weight of the inhibitor component is mixed for every 100 parts by weight of component (a) and is selected from the group consisting of l-chloro-2-butene, 3-chloro-l-butyne, 3-methyl-3-hydroxy-l-butyne and mixtures thereof.