US 11,981,776 B2
Curable silicone composition and cured product thereof, layered product and production method therefor, and optical device or optical display
Atsushi Sugie, Ichihara (JP); Takuya Ogawa, Ichihara (JP); Michitaka Suto, Ichihara (JP); Makoto Yoshitake, Ichihara (JP); and Haruhiko Furukawa, Ichihara (JP)
Assigned to DOW TORAY CO., LTD., Tokyo (JP)
Appl. No. 17/285,730
Filed by DOW TORAY CO., LTD., Tokyo (JP)
PCT Filed Oct. 15, 2019, PCT No. PCT/JP2019/040431
§ 371(c)(1), (2) Date Apr. 15, 2021,
PCT Pub. No. WO2020/080349, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 2018-196661 (JP), filed on Oct. 18, 2018.
Prior Publication US 2022/0002493 A1, Jan. 6, 2022
Int. Cl. C08G 77/12 (2006.01); C08G 77/08 (2006.01); G02B 1/04 (2006.01); G02F 1/1333 (2006.01); G02F 1/13357 (2006.01)
CPC C08G 77/12 (2013.01) [C08G 77/08 (2013.01); G02B 1/04 (2013.01); G02F 1/13338 (2013.01); G02F 1/133602 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A curable silicone composition, comprising:
(A) an organopolysiloxane having an alkenyl group, comprising
the following component (a1) and component (a2):
(a1) a straight chain or partially branched organopolysiloxane having in one molecule at least 2 alkenyl groups each having 2 to 12 carbon atoms; and
(a2) an organopolysiloxane having an alkenyl group, as expressed by average unit formula: (R13SiO1/2)a(R12SiO2/2)b(R1SiO3/2)c(SiO4/2)d where component (a2) is different from component (a1), R1 independently represents a monovalent hydrocarbon group with 1 to 12 carbon atoms, at least 1 mol % of R1 is an alkenyl group with 2 to 12 carbon atoms, and a, b, c and d satisfy all of the following conditions: (a+b+c+d=1, 0≤a≤0.8, 0≤b≤0.4, 0≤c≤0.8, 0≤d≤0.6, and 0.2≤(c+d)≤0.8);
(B) an organohydrogenpolysiloxane, comprising
the following components (b1) and component (b2):
(b1) a straight chain or partially branched organohydrogenpolysiloxane having at least one silicon-bonded hydrogen atom on one or more ends of a molecular chain; and
(b2) an organohydrogenpolysiloxane as expressed by average unit formula: (R23SiO1/2)e(R22SiO2/2)f(R2SiO3/2)g(SiO4/2)h, where component (b2) is different from component (b1), R2 independently represent a hydrogen atom or a monovalent hydrocarbon group with 1 to 12 carbon atoms excluding an alkenyl group, at least 1 mol % of R2 is a hydrogen atom, and e, f, g and h satisfy all of the following conditions: (e+f+g+h)=1, 0≤e≤0.8, 0≤f≤0.4, 0≤g≤0.7, 0≤h≤0.5, and 0.2≤(g+h)≤0.7);
(C) a hydrosilylation reaction catalyst; and
(D) an organic compound having two or more alkoxysilyl groups in one molecule;
wherein:
the amount of component (a2) is within a range of 0.5 to 10.0 mass %, and the amount of component (b2) is within a range of 0.001 to 2.0 mass %, each relative to the sum of non-volatile components of the curable silicone composition;
the amount of component (B) is an amount such that the amount of silicon-bonded hydrogen atoms in component (B) is 0.5 to 2 mol per 1 mol of the aliphatic unsaturated carbon-carbon bonds in component (A);
the amount of component (D) is within a range of 0.01 to 5 mass %, the amount of a polyether compound is 0.1 mass % or less, and the amount of a compound having an epoxy group and alkoxysilyl group is 0.1 mass % or less, each relative to the total amount of the curable silicone composition; and
at least one of provisos I) or II) is true:
I)
wherein component (a1) is selected from:
(a1-1) ViMe2SiO(SiMe2O232OSiMe2Vi; or
(a1-2) ViMe2SiO(SiMe2O372OSiMe2Vi; and
wherein component (a2) is selected from:
(a2-1) (ViMe2SiO1/2)0.046Me3SiO1/2)0.394(SiO4/2)0.56; or
(a2-2) Si(OSiMe2Vi)4;
II)
wherein component (b1) is:
b1-1: HMe2SiO(SiMe2O)24OSiMe2H; and
wherein component (b2) is selected from:
b2-1: (HMe2SiO1/2)0.63(SiO4/2)0.37; or
b2-2: (HMe2SiO1/2)0.75(PhSiO3/2)0.25.