Tire rubber composition and pneumatic tire

Patent metadata

Field	Value
Publication number	US-12304245-B2
Application number	US-202017434316-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Mar 1, 2019
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

The present invention aims to provide tire rubber composition with significantly improved overall performance in terms of wet grip performance and fuel economy, and pneumatic tires including the rubber compositions. The tire rubber compositions of the present invention have a tan δ versus temperature curve whose peak tan δ and half width satisfy the following relationship (1):

Peak tan δ/Half width≥0.025  (1).

First claim

The invention claimed is:

1. A tire rubber composition,
comprising, based on 100% by mass of total rubber components therein, 25% by mass or more of an isoprene-based rubber and 35% by mass or more of a styrene-butadiene rubber, and
having a tan δ versus temperature curve whose peak tan δ and half width satisfy the following relationship (1):
Peak tan δ/Half width≥0.025  (1).

2. The tire rubber composition according to claim 1 ,
wherein the rubber composition satisfies the following relationship:
0.025≤Peak tan δ/Half width≤0.100.

3. The tire rubber composition according to claim 1 ,
wherein the rubber composition satisfies the following relationship:
0.027≤Peak tan δ/Half width≤0.080.

4. The tire rubber composition according to claim 1 ,
wherein the rubber composition comprises a farnesene polymer.

5. The tire rubber composition according to claim 1 ,
wherein the rubber composition comprises a coumarone-indene resin.

6. A pneumatic tire, comprising the rubber composition according to claim 1 .

7. The pneumatic tire according to claim 6 ,
wherein the tire has a maximum total tread thickness of 5 mm or more.

8. The pneumatic tire according to claim 6 ,
wherein the tire has a main tread groove depth of 8.0 to 13.0 mm.

9. The pneumatic tire according to claim 6 ,
wherein the tire has a main tread groove width of 6 to 16 mm.

10. The pneumatic tire according to claim 6 ,
wherein the tire has a maximum total subtread thickness at a main groove bottom of 0.5 to 2.0 mm.

Assignees

• Sumitomo Rubber Ind

Inventors

• Ono Shuichiro
• Kato Fumiya

Classifications

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L47/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00) · CPC title

• C08L45/02

  of coumarone-indene polymers · CPC title

• C08L9/06

  Copolymers with styrene · CPC title

• C08F136/08

  Isoprene · CPC title