US 11,667,791 B2
One-pack type curable silicone gel composition and cured silicone gel
Tadashi Araki, Annaka (JP); and Hiroyasu Hara, Annaka (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 17/628,352
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed Jul. 8, 2020, PCT No. PCT/JP2020/026634
§ 371(c)(1), (2) Date Jan. 19, 2022,
PCT Pub. No. WO2021/014970, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. JP2019-136760 (JP), filed on Jul. 25, 2019.
Prior Publication US 2022/0282090 A1, Sep. 8, 2022
Int. Cl. C08G 77/08 (2006.01); C08L 83/06 (2006.01); B01J 23/42 (2006.01); C08G 77/14 (2006.01); C08G 77/00 (2006.01); C08J 3/075 (2006.01); C08L 83/12 (2006.01); C08L 83/04 (2006.01); C08G 77/20 (2006.01)
CPC C08L 83/06 (2013.01) [B01J 23/42 (2013.01); C08G 77/14 (2013.01); C08G 77/70 (2013.01); C08J 3/075 (2013.01); C08L 83/12 (2013.01); C08G 77/20 (2013.01); C08J 2383/06 (2013.01); C08L 83/04 (2013.01)] 4 Claims
 
1. A one-pack curable silicone gel composition comprising:
(A) 100 parts by weight of a branched organopolysiloxane leaving the average compositional formula (1):
MαMViβDγTδ  (1)
wherein M is a unit R13SiO(1/2),
MVi is a unit R12RSiO(1/2),
D is a unit R12SiO(2/2),
T is a unit R1SiO(3/2),
R is independently an alkenyl group, R1 is independently an unsubstituted or substituted monovalent hydrocarbon group free of aliphatic unsaturation, α is a positive number of 0.01 to 3,6, β is a positive number of 0.01 to 3.6, α+β is from 0.5 to 5, α/β is from 0.1 to 5, γ is a positive number of 10 to 1,600, δ is a positive number of 0.5 to 3, and (α+β)/δ is from 0.8 to 1.7,
(B) 0.1 to 50 parts by weight of an organohydrogenpolysiloxane having the general formula (2):

OG Complex Work Unit Chemistry
wherein R1 is as defined above, and z is an integer of 1 to 500,
(C) an effective amount of a platinum base catalyst, and
(D) a phosphite compound having the general formula (3):

OG Complex Work Unit Chemistry
wherein R2 is a C1-C10 monovalent aliphatic hydrocarbon group, and X is hydrogen or methyl, in such an amount as to provide more than 3 molecules to 15 molecules of the phosphite compound per platinum atom in component (C).