RUBBER COMPOSITION FOR STUDLESS TIRE AND STUDLESS TIRE

• US 20110112215A1
• Filed: 11/10/2010
• Published: 05/12/2011
• Est. Priority Date: 11/12/2009
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: KOJIMA, Ryoji
• Granted Patent: US 8,329,799 B2
• Time in Patent Office: Days
• US Class Current: 523/158
• CPC Class Codes: B60C 1/0016 Compositions of the tread
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 5/01 Hydrocarbons C08K5/0091 takes precedence
• CPC Class Codes: C08L 2666/08 Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof
• CPC Class Codes: C08L 7/00 Compositions of natural rubber
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: C08L 9/06 Copolymers with styrene

Abstract

The invention provides a rubber composition for studless tire achieving well-balanced abrasion resistance, performance on ice and snow, handling stability, and wet grip performance; and a studless tire including a tread produced from the composition. The composition contains: a rubber component; aromatic oil; silica; carbon black; and a mixture of a zinc salt of aliphatic carboxylic acid and a zinc salt of aromatic carboxylic acid, wherein the total of NR and BR in 100% by mass of the rubber component is 30% by mass or more, the amount of aromatic oil is 12-85 parts by mass, the amount of silica is 12-85 parts by mass, and the amount of mixture is 1 part by mass or more, per 100 parts by mass of the rubber component, and the proportion of silica is 45% by mass or more per 100% by mass of the total of the silica and carbon black.

Claims

1. A rubber composition for a studless tire, comprising:

a rubber component containing natural rubber and butadiene rubber;

an aromatic oil;

silica;

carbon black; and

a mixture of a zinc salt of an aliphatic carboxylic acid and a zinc salt of an aromatic carboxylic acid,

wherein

the total amount of the natural rubber and the butadiene rubber is 30% by mass or more based on 100% by mass of the rubber component,

the amount of the aromatic oil is 12 to 85 parts by mass, the amount of the silica is 12 to 85 parts by mass, and the amount of the mixture is 1 part by mass or more, per 100 parts by mass of the rubber component, and

the proportion of the silica is 45% by mass or more based on 100% by mass of the total amount of the silica and the carbon black.

3. The rubber composition for a studless tire according to claim 1 or 2, which is used for a tread.

4. A studless tire comprising a tread produced from the rubber composition according to claim 1 or 2.

2. A rubber composition for a studless tire, comprising:

a rubber component containing natural rubber and butadiene rubber;

an aromatic oil;

silica;

carbon black;

sulfur; and

an alkylphenol-sulfur chloride condensate represented by the following formula (I);