Novel dual cure silicone compositions

Claim 1

A curable composition comprising a polydiorganosiloxane containing silicon-bonded hydrogen atoms and silicon-bonded olefinic radicals in the same molecule, at least one part by weight per 100 parts by weight of said polydiorganosiloxane of at least one free radical photoinitiator and at least one precious metal-containing hydrosilation catalyst for effecting crosslinking of said silicon-bonded hydrogen atoms and said silicon bonded olefinic radicals.

Claim 21

A method for making a curable composition comprising mixing a polydiorganosiloxane containing silicon-bonded hydrogen atoms and silicon-bonded olefinic radicals in the same molecule, at least one part by weight per 100 parts by weight of said polydiorganosiloxane of at least one free radical photoinitiator and at least one precious metal-containing hydrosilation catalyst for effecting crosslinking of said silicon-bonded hydrogen atoms and said silicon-bonded olefinic radicals.

Claim 22

A method for making a curable composition comprising mixing a polydiorganosiloxane containing silicon-bonded hydrogen atoms and silicon-bonded olefinic radicals in the same molecule, at least one part by weight per 100 parts by weight of said polydiorganosiloxane of at least one free radical photoinitiator and at least one precious metal-containing hydrosilation catalyst for effecting crosslinking of said silicon-bonded hydrogen atoms and said silicon-bonded olefinic radicals.

Claim 23

A method for making a curable composition comprising mixing (A) a polysiloxane having the general formula: ##STR16## wherein each R is an independently selected substituted or unsubstituted monovalent hydrocarbon radical having from 1 to 20 carbon atoms; R 1 is hydrogen, a hydroxyl radical or a substituted or unsubstituted hydrocarbon or hydrocarbonoxy radical having from 1 to 20 carbon atoms; R 2 is a lower alkenyl radical; x is a number such that there is present from about 0.1 to about 20 mole percent alkenyl-containing siloxy units; y is a number such that there is present from about 0.5 to about 50 mole percent hydrogen-containing siloxy units; and x+y+z is a number such that the viscosity of said polysiloxane is from about 25 centipoise to about 2,500,000 centipoise at 25° C. (B) at least one part by weight per 100 parts by weight of said polydiorganosiloxane of at least one free radical photoinitiator; and (C) a precious metal-containing hydrosilation catalyst.

Claim 24

A method for making a curable composition comprising mixing (A) a polysiloxane having the general formula: ##STR16## wherein each R is an independently selected substituted or unsubstituted monovalent hydrocarbon radical having from 1 to 20 carbon atoms; R 1 is hydrogen, a hydroxyl radical or a substituted or unsubstituted hydrocarbon or hydrocarbonoxy radical having from 1 to 20 carbon atoms; R 2 is a lower alkenyl radical; x is a number such that there is present from about 0.1 to about 20 mole percent alkenyl-containing siloxy units; y is a number such that there is present from about 0.5 to about 50 mole percent hydrogen-containing siloxy units; and x+y+z is a number such that the viscosity of said polysiloxane is from about 25 centipoise to about 2,500,000 centipoise at 25° C. (B) at least one part by weight per 100 parts by weight of said polydiorganosiloxane of at least one free radical photoinitiator; and (C) a precious metal-containing hydrosilation catalyst.

Claim 28

The method of claims 18 or 19 wherein the free radical photoinitiator has the general formula: ##STR17## where R 3 is a monovalent alkyl or aryl group or a halogen and Z is hydrogen, alkyl, halogen, nitro, amino or amido.

Claim 33

The method of claims 18 or 19 wherein the precious metal-containing hydrosilation catalyst is selected from the group consisting of platinum metal, platinum complexes, rhodium metal and rhodium complexes.

Claim 39

A method for making a curable composition comprising mixing: (A) a polysiloxane having the general formula: ##STR19## where R is substantially all methyl radicals or a mixture of methyl and phenyl radicals; R 1 is selected from the group consisting of hydrogen atoms, hydroxyl radicals, methyl radicals and methoxy radicals; R 2 is a vinyl radical; x is a number such that there is present from about 1.0 to about 10.0 mole percent vinyl-containing siloxy radicals; y is a number such that there is present from about 2.0 to about 20.0 mole percent hydrogen-containing siloxy radicals; and x+y+z is a number such that the viscosity of said polysiloxane varies from about 100 centipoise to about 10,000 centipoise at 25° C.; (B) from 0.1 to 10 parts by weight per 100 parts by weight of (A) of a photoinitiator selected from the group consisting of t-butylperbenzoate, t-butylper-p-nitrobenzoate, t-butylper-p-methoxybenzoate, t-butylper-p-methylbenzoate, and chlorobenzoate; (C) from 10 ppm to 500 ppm based on (A) of a platinum-containing hydrosilation catalyst, as platinum metal; (D) an organohydrogenpolysiloxane; (E) a vinyl-containing polydiorganosiloxane; and (F) an inhibitor effective for preventing curing of said composition at temperatures below the heat cure temperature.

Claim 40

A method for making a curable composition comprising mixing: (A) a polysiloxane having the general formula: ##STR19## where R is substantially all methyl radicals or a mixture of methyl and phenyl radicals; R 1 is selected from the group consisting of hydrogen atoms, hydroxyl radicals, methyl radicals and methoxy radicals; R 2 is a vinyl radical; x is a number such that there is present from about 1.0 to about 10.0 mole percent vinyl-containing siloxy radicals; y is a number such that there is present from about 2.0 to about 20.0 mole percent hydrogen-containing siloxy radicals; and x+y+z is a number such that the viscosity of said polysiloxane varies from about 100 centipoise to about 10,000 centipoise at 25° C.; (B) from 0.1 to 10 parts by weight per 100 parts by weight of (A) of a photoinitiator selected from the group consisting of t-butylperbenzoate, t-butylper-p-nitrobenzoate, t-butylper-p-methoxybenzoate, t-butylper-p-methylbenzoate, and chlorobenzoate; (C) from 10 ppm to 500 ppm based on (A) of a platinum-containing hydrosilation catalyst, as platinum metal; (D) an organohydrogenpolysiloxane; (E) a vinyl-containing polydiorganosiloxane; and (F) an inhibitor effective for preventing curing of said composition at temperatures below the heat cure temperature.

Claim 50

A method for making an article of manufacture comprising: I. mixing, so as to form a curable composition comprising: (A) a polysiloxane having the general formula: ##STR22## wherein each R is an independently selected substituted or unsubstituted monovalent hydrocarbon radical having from 1 to 20 carbon atoms; R 1 is hydrogen, a hydroxyl radical, or a substituted or unsubstituted hydrocarbon or hydrocarbonoxy radical having from 1 to 20 carbon atoms; R 2 is a lower alkenyl radical; x is a number such that there is present from about 0.1 to about 20 mole percent vinyl-containing siloxy units; y is a number such that there is present from about 0.5 to about 50 mole percent hydrogen-containing siloxy units; and x+y+z is a number such that the viscosity of said polysiloxane is from about 25 to about 2,500,000 centipoise at 25° C.; (B) at lease one part by weight per 100 parts by weight of said polydiorganosiloxane of at least one free radical photoinitiator; and (C) a precious metal-containing hydrosilation catalyst; II. applying a coating of said curable composition to a substrate; and III. curing said coating to said substrate by exposing the coated substrate to a source of ultraviolet radiation and thereafter thermally curing said coating.

Claim 51

A method for making an article of manufacture comprising: I. mixing, so as to form a curable composition comprising: (A) a polysiloxane having the general formula: ##STR22## wherein each R is an independently selected substituted or unsubstituted monovalent hydrocarbon radical having from 1 to 20 carbon atoms; R 1 is hydrogen, a hydroxyl radical, or a substituted or unsubstituted hydrocarbon or hydrocarbonoxy radical having from 1 to 20 carbon atoms; R 2 is a lower alkenyl radical; x is a number such that there is present from about 0.1 to about 20 mole percent vinyl-containing siloxy units; y is a number such that there is present from about 0.5 to about 50 mole percent hydrogen-containing siloxy units; and x+y+z is a number such that the viscosity of said polysiloxane is from about 25 to about 2,500,000 centipoise at 25° C.; (B) at lease one part by weight per 100 parts by weight of said polydiorganosiloxane of at least one free radical photoinitiator; and (C) a precious metal-containing hydrosilation catalyst; II. applying a coating of said curable composition to a substrate; and III. curing said coating to said substrate by exposing the coated substrate to a source of ultraviolet radiation and thereafter thermally curing said coating.