| CPC C09J 183/04 (2013.01) [C08G 77/08 (2013.01); C08G 77/12 (2013.01); C08G 77/20 (2013.01); C08J 7/123 (2013.01); C08G 77/14 (2013.01); C09J 2301/416 (2020.08)] | 5 Claims |
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1. An ultraviolet-curable silicone composition comprising:
(A) a branched organopolysiloxane represented by average unit formula (1) below
(R1SiO3/2)a1(R13SiO1/2)b1(X1O1/2)c1 (1)
wherein each R1 is independently a substituted or unsubstituted monovalent hydrocarbon group, with at least 80 mol % of the occurrences of R1 being methyl groups and the balance being vinyl groups; X1 is a hydrogen atom or an alkyl group, a1 is a number from 0.1 to 1, b1 is a number from 0 to 0.75, c1 is a number from 0 to 0.1, and a1+b1+c1=1;
(B) a linear organopolysiloxane represented by average unit formula (2) below
(R23SiO1/2)a2(R22SiO)b2 (2)
each R2 is independently a substituted or unsubstituted monovalent hydrocarbon group, with at least 20 mol % of the occurrences of R2 being methyl groups and from 0.01 to 25 mol % being alkenyl groups; a2 is a number from 0.001 to 0.67, b2 is a number from 0.33 to 0.999; and a2+b2=1 in an amount of from 0 to 5,000 parts by weight per 100 parts by weight of component (A);
(C) an organohydrogenpolysiloxane of average compositional formula (3) below that has at least two Si—H groups per molecule
R3dHeSiO[(4-d-e)/2] (3)
wherein each R3 is independently a substituted or unsubstituted monovalent hydrocarbon group exclusive of aliphatic unsaturated hydrocarbon groups, and ‘d’ and ‘e’ are numbers which satisfy the conditions 0.7≤d≤2.5, 0.01≤e≤1.0 and 0.8≤d+e≤2.7 in an amount such that the molar ratio of hydrosilyl groups included in component (C) to alkenyl groups included in components (A) and (B), expressed as hydrosilyl/alkenyl, is from 0.8 to 2.0; and
(D) a platinum metal catalyst that is activated by light having a wavelength of between 200 and 500 nm.
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