Tire

• US 8,569,431 B2
• Filed: 07/14/2009
• Issued: 10/29/2013
• Est. Priority Date: 08/01/2008
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Miyazaki, Tatsuya
• Primary Examiner(s): CHEUNG, WILLIAM K
• Application Number:
  US12/502,489
• Publication Number:
  US 20100024947A1
• Time in Patent Office: 1,568 Days
• Field of Search: 152/537, 525/504, 525/505, 525/535, 525/540
• US Class Current: 525/504
• CPC Class Codes: C08K 5/098 Metal salts of carboxylic acids
• CPC Class Codes: C08K 5/34922 Melamine; Derivatives thereof
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: C08L 2666/16 Addition or condensation polymers of aldehydes or ketones according to C08L59/00 - C08L61/00; Derivatives thereof
• CPC Class Codes: C08L 61/04 Condensation polymers of aldehydes or ketones with phenols only
• 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: Y10T 152/1081 Breaker or belt characterized by the chemical composition or physical properties of elastomer or the like

Abstract

A tire having a strip layer between breaker and ply using a rubber composition for a strip layer between breaker and ply capable of improving tensile strength at break and elongation at break, capable of also lessening the lowering rate of fracture property after thermal aging, and also being excellent in separation resistance property is provided. A tire having a strip layer between breaker and ply using a rubber composition for a strip layer between breaker and ply comprising (A) 2.0 to 3.9 parts by mass of sulfur, (B) 0.5 to 4 parts by mass of a cresol resin, a modified cresol resin, resorcinol or a modified resorcinol condensate and (C) 0.3 to 3 parts by mass of a partial condensate of hexamethylolmelaminepentamethylether or a partial condensate of hexamethoxymethylolmelamine, based on 100 parts by mass of a diene rubber component, wherein the thickness of the strip layer between breaker and ply is 0.3 to 3.9 mm.

Claims

1. A tire having a strip layer between a breaker and a ply, and using a rubber composition for the strip layer between the breaker and the ply, the rubber composition comprising:

2.0 to 3.0 parts by mass of sulfur;

0.5 to 4 parts by mass of a cresol resin, a modified cresol resin, resorcinol or a modified resorcinol condensate;

0.3 to 3 parts by mass of a partial condensate of hexamethylolmelaminepentamethylether or a partial condensate of hexamethoxymethylolmelamine, based on 100 parts by mass of a diene rubber component; and

5 to 20 parts by mass of silica having a nitrogen adsorption specific surface area of 100 to 190 m²/g,

wherein the thickness of the strip layer between breaker and ply is 0.3 to 3.9 mm, and

wherein the breaker in a tire widthwise direction is wider than the strip layer.

2. The tire of claim 1, further comprising a cobalt salt of organic acid, wherein the content of the cobalt is 0.05 to 0.8 parts by mass based on 100 parts by mass of the rubber component.

3. The tire of claim 1, further comprising a sidewall provided at an outside of the ply, wherein a widthwise end of the sidewall joins a widthwise end of the strip layer.