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Title:
RUBBER COMPOSITION FOR TIRE, AND TIRE
Document Type and Number:
WIPO Patent Application WO/2023/228610
Kind Code:
A1
Abstract:
The purpose is to provide a rubber composition for a tire that provides excellent damage resistance performance and a tire comprising a tire member comprising the rubber composition for a tire. Provided is a rubber composition for a tire that contains a rubber component including an epoxidated diene rubber, an imidazole compound, and a divalent or higher carboxylic acid compound and, when the elongation at break EB (%) and breaking strength TB (MPa) are measured in accordance with JIS K6251 using a 2-mm thick dumbbell-shaped test piece in compliance with ASTM D638 Type V, the TB, EB repair rate (%) RREB defined below, and TB repair rate (%) RRTB defined below respectively satisfy (1) TB ≥ 0.40, (2) RREB ≥ 20, (3) RRTB ≥ 20. Here, RREB is a value defined by EB (%) of repaired test piece/EB (%) of annealed test piece × 100, and RRTB is a value defined by TB (MPa) of repaired test piece/TB (MPa) of annealed test piece × 100. A repaired test piece is a test piece that was cut in the thickness direction in the center of the long side and the cut surfaces immediately bonded together and heat treated for 24 hours at 80°C. An annealed test piece is a test piece that has been heat treated for 24 hours at 80°C.

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Inventors:
SAWADA JUN (JP)
Application Number:
PCT/JP2023/014734
Publication Date:
November 30, 2023
Filing Date:
April 11, 2023
Export Citation:
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Assignee:
SUMITOMO RUBBER IND (JP)
International Classes:
C08L15/00; B60C1/00; B60C11/00; B60C13/00; B60C15/06; C08K5/092; C08K5/3445
Foreign References:
JP2021123651A2021-08-30
JP2016501940A2016-01-21
JP2019077751A2019-05-23
JP2016526081A2016-09-01
JP2021091748A2021-06-17
Other References:
MYRIAM PIRE; SOPHIE NORVEZ; ILIAS ILIOPOULOS; BENOT LE ROSSIGNOL; LUDWIK LEIBLER;: "Imidazole-promoted acceleration of crosslinking in epoxidized natural rubber/dicarboxylic acid blends", POLYMER, ELSEVIER, AMSTERDAM, NL, vol. 52, no. 23, 19 September 2011 (2011-09-19), AMSTERDAM, NL, pages 5243 - 5249, XP028319839, ISSN: 0032-3861, DOI: 10.1016/j.polymer.2011.09.032
Attorney, Agent or Firm:
ASAHINA & CO. (JP)
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