US 12,404,374 B2
Photocurable silicone composition and cured product thereof
Juyoung Yook, Chungcheongbuk-do (KR); Jongchan Park, Chungcheongbuk-do (KR); Atsushi Sugie, Ichihara (JP); and Deokgu Kim, Chungcheongbuk-do (KR)
Assigned to DOW SILICONES CORPORATION, Midland, MI (US); and DOW TORAY CO., LTD., Tokyo (JP)
Appl. No. 17/778,057
Filed by DOW SILICONES CORPORATION, Midland, MI (US); and DOW TORAY CO., LTD., Tokyo (JP)
PCT Filed Nov. 19, 2020, PCT No. PCT/US2020/061167
§ 371(c)(1), (2) Date May 19, 2022,
PCT Pub. No. WO2021/102074, PCT Pub. Date May 27, 2021.
Claims priority of provisional application 62/939,639, filed on Nov. 24, 2019.
Prior Publication US 2023/0013987 A1, Jan. 19, 2023
Int. Cl. C08G 77/20 (2006.01); C08J 3/28 (2006.01); C08K 5/3492 (2006.01); C08K 5/37 (2006.01); C08K 5/5313 (2006.01)
CPC C08G 77/20 (2013.01) [C08J 3/28 (2013.01); C08K 5/3492 (2013.01); C08K 5/37 (2013.01); C08K 5/5313 (2013.01); C08G 2170/00 (2013.01); C08G 2190/00 (2013.01)] 10 Claims
 
1. A photocurable silicone composition comprising:
(A) 100 parts by mass of an organopolysiloxane represented by the following average composition formula:
R1aR2bSiO(4−a−b)/2
wherein, R1 is an alkenyl group having from 2 to 12 carbons, R2 is an alkyl group having from 1 to 12 carbons, an aryl group having from 6 to 12 carbons, or an aralkyl group having from 7 to 12 carbons; provided that, at least 30 mol % of R2 in a molecule are the aryl groups or the aralkyl groups; and “a” and “b” are positive numbers satisfying: 1≤a+b≤2.5 and 0.001≤a/(a+b)≤0.2;
(B) a compound having at least two thiol groups in a molecule, in an amount that the amount of the thiol groups in the present component is in a range of from 0.2 to 2.0 mol per 1 mol of the total alkenyl groups in component (A);
(C) from 0.01 to 5 parts by mass of a photoradical initiator having a phosphorus atom; and
(D) from 0.001 to 2 parts by mass of a hydroxyphenyl triazine compound represented by the following general formula:

OG Complex Work Unit Chemistry
wherein, R31, R32, R33, R34, R35, R36 and R37 are the same or different, and are groups selected from hydrogen atoms, hydroxy groups or alkyl groups having from 1 to 12 carbons, R4 is a group represented by the following general formula:
—CH2CH(OH)CH2OR5
wherein, R5 is a linear or branched alkyl group having from 6 to 20 carbons.