Rubber composition for tread.U.S. patent: 7,241,843 Issued: July 10, 2007 Inventor: Tatsuya Miyazaki Assigned: Sumitomo Rubber Industries Sumitomo Rubber Industries, Ltd. (住友ゴム工業株式会社 Key statement: A rubber composition for a tread optimizing a vulcanization vulcanization (vŭl'kənəzā`shən), treatment of rubber to give it certain qualities, e.g., strength, elasticity, and resistance to solvents, and to render it impervious to moderate heat and cold. speed in a vulcanization step and, further, improved heat aging resistance is provided. A rubber composition for a tread comprising 20 to 90 parts by weight of silica, 0.5 to 2 parts by weight of (A) a guanidine guanidine /gua·ni·dine/ (gwah´ni-den) the compound NHdbondC(NH2)2, a strong base found in the urine as a result of protein metabolism and used in the laboratory as a protein denaturant. vulcanization accelerator, 0.1 to 0.5 parts by weight of (B) a thiuram vulcanization accelerator, and 0.5 to 2 parts by weight of (C) a sulfenamide vulcanization accelerator represented by the general formula: (wherein R is a linear alkyl group alkyl group (ăl`kĭl), in chemistry, group of carbon and hydrogen atoms derived from an alkane molecule by removing one hydrogen atom (see radical). or a branched alkyl group having 1 to 18 carbons), based on 100 parts by weight of a rubber component. |
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