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Rubber composition for tire and pneumatic tire

A rubber composition and rubber technology are applied in the field of rubber compositions for tires and pneumatic tires, which can solve the problems of reduced performance, increased hardness, inability to improve wet grip performance, etc., and achieve improved elongation at break and improved wear resistance. Effect

Active Publication Date: 2014-11-05
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when "SA85" or coumarone-indene resin is mixed in a rubber composition containing a large amount of NR, the hardness (Hs) at low temperature increases
Therefore, wet grip performance at low μ paved surfaces cannot be improved, or performance on ice and snow is reduced, so there is still room for improvement

Method used

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  • Rubber composition for tire and pneumatic tire
  • Rubber composition for tire and pneumatic tire
  • Rubber composition for tire and pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 18 L of n-hexane, 740 g of styrene (manufactured by KANTO CHEMICAL Co., Ltd.), 1260 g of butadiene, and 10 mmol of tetramethylethylenediamine were added to a 30 L pressure vessel fully purged with nitrogen, and the temperature was heated to 40°C. Next, 10 ml of butyllithium was added thereto, and then, the temperature was raised to 50° C., and the mixture was stirred for 3 hours. Next, 11 ml of the above-mentioned terminal modifier was added to the mixture, and the mixture was stirred for 30 minutes. 15 ml of methanol and 0.1 g of 2,6-tert-butyl-p-cresol were added to the reaction solution. Subsequently, the reaction solution was poured into a stainless steel container containing 18 L of methanol, thereby collecting aggregates. The obtained aggregate was dried under reduced pressure for 24 hours to obtain a modified SBR.

[0077] Hereinafter, various chemicals used in Examples and Comparative Examples will be collectively explained. The terpene-based resins (1) to (...

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Abstract

A rubber composition, for tires, which allows improvement of both wet grip performance and performance on ice and snow, and further allows abrasion resistance and elongation at break to be advantageously obtained, and a pneumatic tire using the rubber composition, are provided. A rubber composition for tires is provided in which a content of an isoprene-based rubber in 100% by mass of a rubber component ranges from 10% by mass to 100% by mass, a content of a butadiene rubber in 100% by mass of the rubber component ranges from 0% by mass to 80% by mass, a content of a styrene butadiene rubber in 100% by mass of the rubber component ranges from 0% by mass to 70% by mass, and a content of a terpene-based resin having a hydroxyl value that is less than or equal to 20 and a softening point ranging from 106°C to 124°C ranges from 1 part by mass to 50 parts by mass, per 100 parts by mass of the rubber component.

Description

technical field [0001] The present invention relates to a rubber composition for tires and a pneumatic tire using the rubber composition. Background technique [0002] As a method for improving the grip performance or abrasion resistance exhibited by a rubber composition, there is known a method in which a resin such as α-methylstyrene resin or coumarone-indene resin is mixed and used (see, for example , Patent Document 1). "SA85" manufactured by Arizona Chemical Co. is generally used as an α-methylstyrene resin and was initially developed for rubber compositions containing styrene-butadiene rubber (SBR) and butadiene rubber (BR) for summer tires. However, in recent years, "SA85" is also mixed in rubber compositions containing a large amount of natural rubber (NR). [0003] However, when "SA85" or a coumarone-indene resin is mixed in a rubber composition containing a large amount of NR, the hardness (Hs) at low temperature increases. Therefore, wet grip performance at low...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L9/00C08L9/06C08L45/00C08K13/02C08K3/36C08K3/04C08K5/18C08K5/3437C08K5/09C08K3/22B60C1/00
CPCC08L7/00C08L9/00C08K3/04C08K3/36C08K5/09C08K2003/2296C08L9/06C08L47/00C08L91/00
Inventor 宫崎达也时宗隆一
Owner SUMITOMO RUBBER IND LTD
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