Abstract An organopolysiloxane photoinitiator having an average of at least two siloxane units, of which at least an average of one siloxane unit per organopolysiloxane molecule has the formula: X.sub.a R.sub.b SiO.sub.(4-a-b)/2 wherein a is an integer of 1-3, b is a integer of 0-2 and a plus b equals 1-3; R is C 1 -C 10 hydrocarbyl or halogen substituted C 1 -C 10 hydrocarbyl; and X is substituted acetophenone photomoiety of the formula: ##STR1## where R 1 is any substitutent which will not interfere with hydrosilation, n is an integer between 0 and 4; R 2 is organosilyl substituted alkyl or alkenyl; R 3 is H, alkyl or aryl; and R 4 is a divalent hydrocarbon group having between 2 and 10 carbon atoms. The silicones are prepared by hydrosilation of the corresponding olefinically or acetylenically α,α-dialkenylacetophenones or α,α-dialkynylacetophenones.
An organopolysiloxane photoinitiator having an average of at least two siloxane units, of which at least an average of one siloxane units per organopolysiloxane molecule has the formula: X.sub.a R.sub.b SiO.sub.(4-a-b)/2 wherein a is an integer of 1-3, b is an integer of 0-2 and a plus b equals 1-3; R is C 1 -C 10 hydrocarbyl or halogen substituted C 1 -C 10 hydrocarbyl; and X is substituted acetophenone photomoiety of the formula: ##STR3## where R 1 is any substituent which will not interfere with hydrosilation, n is an integer between 0 and 4; R 2 is organosilyl substituted alkyl or alkenyl; R 3 is H, alkyl or aryl; and R 4 is a divalent hydrocarbon group having between 2 and 10 carbon atoms.
Claim 2
Dependent Claim
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An organopolysiloxane photoinitiator having an average of at least two siloxane units, of which at least an average of one siloxane units per organopolysiloxane molecule has the formula: X.sub.a R.sub.b SiO.sub.(4-a-b)/2 wherein a is an integer of 1-3, b is an integer of 0-2 and a plus b equals 1-3; R is C 1 -C 10 hydrocarbyl or halogen substituted C 1 -C 10 hydrocarbyl; and X is substituted acetophenone photomoiety of the formula: ##STR3## where R 1 is any substituent which will not interfere with hydrosilation, n is an integer between 0 and 4; R 2 is organosilyl substituted alkyl or alkenyl; R 3 is H, alkyl or aryl; and R 4 is a divalent hydrocarbon group having between 2 and 10 carbon atoms.
Claim 3
Dependent Claim
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A photoinitiator as in claim 1 where R is alkyl, substituted alkyl or aryl.
Claim 4
Dependent Claim
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A photoinitiator as in claim 1 where R 1 is halo, alkyl or alkoxy.
Claim 5
Dependent Claim
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The photoinitiator of claim 1 where n is 0.
Claim 6
Dependent Claim
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The photoinitiator of claim 1 where R 4 is propylene or propenylene.
Claim 7
Dependent Claim
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The photoinitiator of claim 1 where R 2 is (CH 3 ) 3 SiOSi(CH 3 ) 2 C 3 H 6 or trimethylsilylpropyl.
Claim 8
Dependent Claim
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The method of curing a free radical curable silicone resin having acrylic or vinyl functionality comprising subjecting to actinic radiation a composition of said resin and a photoinitiator as in claim 1.
Claim 9
Dependent Claim
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A composition comprising a photoinitiator as in claim 1 and a free radical curable silicone resin with acrylic or vinyl functionality.