| 摘要 |
<p>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: XaRbSiO(4-a-b/2) (I) wherein a is an integer of 1-3, b is an integer of 0-2 and a plus b equals 1-3; R is C1-C10 hydrocarbyl or halogen substituted C1-C10 hydrocarbyl; and X is a substituted acetophenone photomoiety selected from: <CHEM> where R<1> is any substituent which will not interfere with hydrosilation, n is an integer between 0 and 5 in formulas (II), (IIa), (III), (IIIa), (IV) and (IVa) and between 0 and 4 in formula (III) and (IIIa); m is 0 or 1; R<2> is alkyl or substituted alkyl; R<3> is H, alkyl or aryl; R<4> is a divalent hydrocarbon group having between 2 and 10 carbon atoms or an alkylene oxy alkylene group; R<5> is a group selected from H, alkyl, aryl, organosilyl, or the reaction product of an isocyanate esterification reagent or an etherification reagent with the hydroxyl product formed when R<5> is H and R<6> is a trivalent hydrocarbon or hydrocarbon oxyhydrocarbon group. The silicones are prepared by hydrosilation of the corresponding olefinically or acetylenically unsaturated acetophenones.</p> |
