Patent ID: 11884820
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  H | IPC C

Claim 0:
1. A silicone gel composition comprising:
(A) 100 parts by weight of an organopolysiloxane having at least one alkenyl group bonded to silicon atom in one molecule,
(B) an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule comprising the following component (b-1) and component (b-2) in an amount such that hydrogen atoms bonded to silicon atoms in the whole component (B) are 0.01 to 3 mol per 1 mol of alkenyl groups in the component (A),
(b-1) an organohydrogenpolysiloxane having at least three hydrogen atoms bonded to silicon atoms in one molecule, represented by the average composition formula (1):

(R23SiO1/2)b(R22SiO)c(HR2SiO)d  (1), wherein each of R2s represents the same or different monovalent hydrocarbon group, b is a positive number of 0.01 to 0.3, c is a positive number of 0.2 to 0.89, d is a positive number of 0.1 to 0.7, and b+c+d=1,
(b-2) an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule, represented by the average composition formula (2):

R3eHfSiO(4-e-f)/2  (2), wherein R3s is independently an unsubstituted or substituted monovalent hydrocarbon group free of an aliphatic unsaturated bond, e is a positive number of 0.7 to 2.2, and f is a positive number of 0.001 to 0.5, provided that e+f is 0.8 to 2.5,, provided that excluding the organohydrogenpolysiloxane of the component (b-1),
(C) effective amount as a catalyst of a platinum group metal-based curing catalyst,
(D) 0.01 to 3 parts by weight of an isocyanuric acid derivative having two trialkoxysilyl groups and one alkenyl group or one hydrogen atom bonded to a silicon atom (SiH group) in one molecule, and/or an isocyanuric acid derivative having three trialkoxysilyl groups in one molecule, and
(E) 0.01 to 10 parts by weight of one or more alkoxysilyl group-containing ketene silyl acetal compounds having the general formula (3) and/or a partial hydrolytic condensate thereof:, , wherein R4 and R5 are alkyl groups having 1 to 4 carbon atoms, R6 is an alkyl group having 1 to 12 carbon atoms, R4, R5 and R6 may be the same or different groups each other, and n is 0 or 1,
which is cured to provide a silicone gel cured product having a penetration of 30 to 70 according to JIS K2220.