Granted Patent B2

US 12,331,178 · App. 17/255,433 · Granted Jun 17, 2025

Inventor: Satoshi Motoda (Tokyo, JP)

Assignee: KURARAY CO., LTD.

C08K3/04C08K3/36C08L9/00C08L15/00C08L2312/02

Abstract

Claims (9)

1. A rubber composition comprising a solid rubber (A),a liquid diene rubber (B), a silane coupling agent (C), silica (D) having a BET specific surface area of 30 to 200 m 2/ g, and a crosslinking agent,

wherein the solid rubber (A) is at least one selected from the group consisting of natural rubbers and ethylene propylene diene rubbers,

the crosslinking agent is a peroxide having a structure represented by the following formula (3), wherein R 1 and R 2 are each a substituted or unsubstituted, linear or branched, alkyl group having

1 to 5 carbon atoms, or a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6 to 10 carbon atoms, and

the liquid diene rubber (B) is a modified liquid diene rubber (B1A) that has a functional group that is a partial structure represented by the following formula (2),

wherein R 3 is a C1-C6 divalent alkylene group, and R 4 , R 5 and R 6 are each independently a methoxy group, an ethoxy group, a phenoxy group, a methyl group, an ethyl group or a phenyl group, with the proviso that at least one of R 4 , R 5 , and R 6 is a methoxy group, an ethoxy group or a phenoxy group, and

the average number of the functional groups of the partial structure represented by the formula (2) per molecule of the modified liquid diene rubber (B1A) is 1 to 9, and the weight average molecular weight of the liquid diene rubber (B) is not less than 5,700 and not more than 60,000.

2. A cured product obtained by crosslinking the rubber composition described in claim 1 .

3. A rubber vibration insulator comprising the cured product described in claim 2 .

Assignments (1)

Priority Claims (2)

Continuity (1)

References Cited (28)