US 12,460,079 B2
Curable silicone resin composition and cured product thereof
Tomoyuki Mizunashi, Annaka (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Filed on Mar. 9, 2022, as Appl. No. 17/690,053.
Claims priority of application No. 2021-53280 (JP), filed on Mar. 26, 2021.
Prior Publication US 2022/0315763 A1, Oct. 6, 2022
Int. Cl. C08L 83/04 (2006.01); C08G 77/08 (2006.01); C08G 77/12 (2006.01); C08G 77/20 (2006.01); C08J 5/18 (2006.01)
CPC C08L 83/04 (2013.01) [C08G 77/08 (2013.01); C08G 77/12 (2013.01); C08G 77/20 (2013.01); C08J 5/18 (2013.01); C08J 2383/05 (2013.01); C08J 2383/07 (2013.01)] 13 Claims
 
1. A curable silicone resin composition comprising the following components (A) to (D):
(A) an organopolysiloxane having two or more and less than six alkenyl groups per molecule, the alkenyl groups each having 2 to 10 carbon atoms;
(B) an organopolysiloxane shown by the following formula (1),

OG Complex Work Unit Chemistry
wherein each R1 independently represents a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms,
each R2 independently represents an alkenyl group having 2 to 10 carbon atoms, and
“n” and “m” represent integers satisfying 0≤n, 0≤m, and 10≤n+m≤10,000;
(C) an organohydrogenpolysiloxane having two or more hydrogen atoms bonded to silicon atoms per molecule, and contained such that the component (C) has a hydrosilyl group in an amount of 0.1 to 4.0 mol per mol of all alkenyl groups bonded to silicon atoms in the curable silicone resin composition; and
(D) a platinum group metal-based catalyst, wherein
the component (A) comprises:
(A1) a linear organopolysiloxane having two or more alkenyl groups per molecule each bonded to a silicon atom and having 2 to 10 carbon atoms, a group bonded to a silicon atom other than the alkenyl groups in the linear organopolysiloxane being a methyl group; and
(A2) an organopolysiloxane having a resin structure, two or more alkenyl groups per molecule each bonded to a silicon atom and having 2 to 10 carbon atoms, and one or more hydroxyl groups per molecule each bonded to a silicon atom, wherein the hydroxyl groups are in an amount of 0.001 to 1.0 mol/100 g,
the component (A2) is a branched methylpolysiloxane composed of SiO4/2 unit and R53SiO1/2 unit, wherein R5 independently represents a methyl group or a vinyl group,
the component (A1) is contained within a range of 20 or more to less than 100 mass % in the component (A), and
the component (B) is in an amount of 0.1 to 50 mass % relative to a total mass of the components (A) and (B).