US 12,168,745 B2
Ultraviolet ray curable silicone adhesive composition and cured product thereof
Kohei Otake, Annaka (JP); Taichi Kitagawa, Annaka (JP); Nobuaki Matsumoto, Annaka (JP); Toshiyuki Ozai, Annaka (JP); and Yoshinori Ogawa, Tokyo (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 17/292,609
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed Oct. 25, 2019, PCT No. PCT/JP2019/041891
§ 371(c)(1), (2) Date May 10, 2021,
PCT Pub. No. WO2020/105365, PCT Pub. Date May 28, 2020.
Claims priority of application No. 2018-217910 (JP), filed on Nov. 21, 2018.
Prior Publication US 2022/0002595 A1, Jan. 6, 2022
Int. Cl. C08F 2/46 (2006.01); C08F 2/50 (2006.01); C08G 61/04 (2006.01); C09J 4/06 (2006.01); C09J 7/38 (2018.01); C09J 11/04 (2006.01)
CPC C09J 7/385 (2018.01) [C09J 4/06 (2013.01); C09J 11/04 (2013.01); C09J 2203/326 (2013.01); C09J 2301/302 (2020.08); C09J 2433/00 (2013.01); C09J 2483/00 (2013.01)] 10 Claims
 
1. A UV-curable silicone pressure-sensitive adhesive composition comprising:
(A) 100 parts by weight of an organopolysiloxane containing per molecule two groups having the general formula (1):

OG Complex Work Unit Chemistry
wherein R1 is each independently a C1-C20 monovalent hydrocarbon group, R2 is oxygen or a C1-C20 alkylene group, R3 is each independently an acryloyloxyalkyl, methacryloyloxyalkyl, acryloyloxyalkyloxy or methacryloyloxyalkyloxy group, p is a number of 0 to 10, and “a” is a number of 1 to 3,
(B) 1 to 200 parts by weight of a monofunctional (meth)acrylate compound free of a siloxane structure,
(C) 1 to 1,000 parts by weight of an organopolysiloxane resin comprising (a) units having the general formula (2):

OG Complex Work Unit Chemistry
wherein R1, R2, R3, a, and p are as defined above, (b) R43SiO1/2 units wherein R4 is a C1-C10 monovalent hydrocarbon group, and (c) SiO4/2 units, a molar ratio of the total of units (a) and (b) to units (c) being in the range of from 0.4:1 to 1.2:1, and
(D) 0.01 to 20 parts by weight of a photopolymerization initiator,
the composition being free of a non-crosslinkable organopolysiloxane resin, wherein the monofunctional (meth)acrylate compound free of a siloxane structure (B) is at least one of isoamyl acrylate, lauryl acrylate, stearyl acrylate, ethoxy-diethylene glycol acrylate, methoxy-triethylene glycol acrylate, 2-ethylhexyl diglycol acrylate, phenoxyethyl acrylate, phenoxydiethylene glycol acrylate, tetrahydrofurfuryl acrylate, and isobornyl acrylate.