| 摘要 |
PURPOSE:To obtain the title composition which can be utilized in an excellent snow tire controlled in hardening at low-temperatures and in lowering of hardness at normal temperatures as compared with the conventional tire, by mixing a rubber with an ester plasticizer for low-temperature use, a methylene donor and a methylene acceptor. CONSTITUTION:A tread rubber composition prepared by mixing 100pts.wt. at least one rubber selected from among natural rubber, polyisobutyrene rubber and polybutadiene rubber with 3-20pts.wt. ester plasticizer for low-temperature use, 0.5-5pts.wt. methylene donor (e.g., hexamethylenetetramine) and 1-5pts.wt. methylene acceptor (e.g., resorcinol). This composition can be controlled in the rise of hardness in a low-temperature range, and can retain its softness, so that it has a high friction force on ice or snow, can be increased markedly in performances as a snow tire as compared with the conventional one and can be utilized as a snow tire of a motor truck or a bus. Further, it can suitably retain its hardness at normal temperature and does not loose it, so that it can be protected from abrasion due to decrease in hardness.
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