Rubber composition and pneumatic tire including the same

Patent metadata

Field	Value
Publication number	US-10669409-B2
Application number	US-201515320894-A
Country	US
Kind code	B2
Filing date	Jun 24, 2015
Priority date	Jun 27, 2014
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A rubber composition includes a diene rubber (A), a silica (B), a silane coupling agent (C), and an acid-modified polyolefin (D); the diene rubber (A) containing not less than 30 mass % of an aromatic vinyl-conjugated diene copolymer rubber; the acid-modified polyolefin (D) having at least one type of repeating unit selected from the group consisting of propylene, 1-butene, and 1-octene; a content of the silica (B) being from 5 to 150 parts by mass per 100 parts by mass of the diene rubber (A); and a total content of the silane coupling agent (C) and the acid-modified polyolefin being from 5 to 30 parts by mass per 100 parts by mass of the diene rubber (A). Such rubber composition is capable of achieving both excellent vulcanization properties and low heat build-up. A pneumatic tire includes such rubber composition.

First claim

The invention claimed is:

1. A rubber composition containing a diene rubber (A), a silica (B), a silane coupling agent (C), and an acid-modified polyolefin (D);
the diene rubber (A) containing not less than 30 mass % of a styrene butadiene rubber and a butadiene rubber;
the acid-modified polyolefin (D) is a maleic acid-modified ethylene/1-butene copolymer;
a content of the silica (B) being from 5 to 150 parts by mass per 100 parts by mass of the diene rubber (A);
a content of each of the silane coupling agent (C) and the acid-modified polyolefin (D) being not less than 1 part by mass per 100 parts by mass of the diene rubber (A); and
a total content of the silane coupling agent (C) and the acid-modified polyolefin being from 5 to 30 parts by mass per 100 parts by mass of the diene rubber (A),
wherein a part of the silica (B) and the acid-modified polyolefin (D) are contained as a mixture (E) prepared by mixing the part of the silica (B) and the acid-modified polyolefin (D) in advance,
wherein at least a part of the silica (B) in the mixture (E) bonds to an acid-modified site of the acid-modified polyolefin (D).

2. The rubber composition according to claim 1 , wherein a mass ratio of the acid-modified polyolefin (D) and the silica (B) in the mixture (E) is from 100:5 to 100:60.

3. The rubber composition according to claim 1 , wherein a content of the mixture (E) is from 3 to 30 parts by mass per 100 parts by mass of the diene rubber (A).

4. A pneumatic tire comprising the rubber composition according to claim 1 in a structural member thereof.

Assignees

• Yokohama Rubber Co Ltd

Inventors

• Tanabe Yusuke
• Sato Shun

Classifications

• C08L23/26

  modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876) · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title