US 12,227,649 B2
Addition-curable self-adhesive silicone rubber composition and silicone rubber cured product
Tatsuei Hara, Annaka (JP); and Nobu Kato, Annaka (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 17/420,230
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed Jan. 7, 2020, PCT No. PCT/JP2020/000112
§ 371(c)(1), (2) Date Jul. 1, 2021,
PCT Pub. No. WO2020/145249, PCT Pub. Date Jul. 16, 2020.
Claims priority of application No. 2019-003444 (JP), filed on Jan. 11, 2019.
Prior Publication US 2022/0064449 A1, Mar. 3, 2022
Int. Cl. C08G 77/08 (2006.01); C08G 77/12 (2006.01); C08G 77/20 (2006.01); C08G 77/52 (2006.01); C08K 3/36 (2006.01); C08K 5/05 (2006.01); C08K 5/3475 (2006.01); C08L 83/04 (2006.01); C09J 183/04 (2006.01)
CPC C08L 83/04 (2013.01) [C08G 77/08 (2013.01); C08G 77/12 (2013.01); C08G 77/20 (2013.01); C08G 77/52 (2013.01); C08K 3/36 (2013.01); C08K 5/05 (2013.01); C08K 5/3475 (2013.01); C09J 183/04 (2013.01); C08K 2201/006 (2013.01); C08L 2205/025 (2013.01); C08L 2205/03 (2013.01)] 6 Claims
 
1. An addition-curable self-adhesive silicone rubber composition comprising:
(A) 100 parts by weight of an alkenyl group-containing organopolysiloxane having at least two silicon-bonded alkenyl groups per molecule;
(B-1) 0.05 to 10 parts by weight of an organosilicon compound of from 1 to 100 silicon atoms having at least one phenylene skeleton and at least one silicon-bonded hydrogen atom per molecule;
(B-2) 0.2 to 30 parts by weight of an organohydrogenpolysiloxane that has at least two silicon-bonded hydrogen atoms per molecule and is free of aromatic groups, such that the number of moles of silicon-bonded hydrogen groups (Si—H groups) in, respectively, component (B-1) and component (B-2) relative to the total number of moles of silicon-bonded hydrogen atoms (total Si—H groups) in components (B-1) and (B-2) satisfies the condition [Si—H groups (B-1]/[total Si—H groups]=1 to 30 mol % and [Si—H groups (B-2)]/[total Si—H groups]=70 to 99 mol %;
(C) a platinum-based catalyst in an amount, expressed in terms of the weight of platinum metal with respect to the total weight of components (A), (B-1) and (B-2), that is from 0.5 to 500 ppm;
(D) a benzotriazole derivative of the general formula (I) below:

OG Complex Work Unit Chemistry
wherein R1 is a hydrogen atom or a monovalent hydrocarbon group of 1 to 6 carbon atoms, R2 is a monovalent hydrocarbon group of 1 to 15 carbon atoms or a group of the formula (I′) below:

OG Complex Work Unit Chemistry
wherein R3 is —(CH2)a—Si(OR4)3, R4 is an alkyl group of 1 to 4 carbon atoms or a SiR53 group (R5 being an alkyl group of 1 to 4 carbon atoms), a is an integer from 1 to 6, and * represents a site available for bonding,
in an amount of 2 to 100 moles per mole of platinum atoms in component (C); and
(E) an acetylene alcohol compound or a compound obtained by modifying the alcoholic hydroxyl group thereon with a silane or siloxane, in an amount of 1 to 500 moles of acetylene per mole of platinum atoms in component (C).