	US 12,104,046 B2
	Rubber composition for tire
Hiroki Sugimoto, Kanagawa (JP); and Rie Nakajima, Kanagawa (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Appl. No. 18/576,038
Filed by The Yokohama Rubber Co., Ltd., Kanagawa (JP)
PCT Filed Mar. 25, 2022, PCT No. PCT/JP2022/014283 § 371(c)(1), (2) Date Jan. 2, 2024, PCT Pub. No. WO2023/281855, PCT Pub. Date Jan. 12, 2023.
Claims priority of application No. 2021-112738 (JP), filed on Jul. 7, 2021.
Prior Publication US 2024/0262990 A1, Aug. 8, 2024
Int. Cl. C08L 15/00 (2006.01); B60C 1/00 (2006.01); C08K 3/36 (2006.01); C08K 5/5419 (2006.01)

CPC C08L 15/00 (2013.01) [B60C 1/0016 (2013.01); C08K 3/36 (2013.01); C08K 5/5419 (2013.01); C08L 2205/03 (2013.01)]

12 Claims

1. A rubber composition for a tire, the rubber composition comprising from 10 to 50 parts by mass of a thermoplastic resin in 100 parts by mass of a diene rubber containing 60 mass % or more of a styrene-butadiene rubber,

the styrene-butadiene rubber having a styrene content of from 5 to 30 mass % and a vinyl content of from 10 to 35 mass %,

a mixture containing the diene rubber and the thermoplastic resin in a mass ratio of 1:1 satisfying a relationship where a difference (Tga−Tgm) between a theoretical value (Tga) of a glass transition temperature of the mixture calculated based on an average glass transition temperature (Tg1) of the diene rubber and a glass transition temperature (Tg2) of the thermoplastic resin, and a measurement value (Tgm) of a glass transition temperature of the mixture, is lower than 5° C., and a difference (Tg2−Tg1) between the glass transition temperature (Tg2) of the thermoplastic resin and the average glass transition temperature (Tg1) of the diene rubber is from 50 to 105° C., and

an amount of the thermoplastic resin being 30 mass % or more in 100 mass % total of a plasticizer component contained in the rubber composition.