| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rubber compsn. reduced in vol. resistivity by compounding a diene elastomer, reinforcing fillers comprising precipitated silica and a carbon black, and a composite material comprising a rubber compounding ingredient or a silica coupling agent and a carbon black. SOLUTION: This compsn. contains 100 phr diene elastomer (e.g. cis-1,4- polyisoprene), 35-110 phr reinforcing fillers comprising 25-100 phr precipitated silica and 10-25 phr carbon black, and 2-20 phr composite material comprising a liq. or solid rubber compounding ingredient (e.g. an antidecomposition agent, a vulcanization accelerator, or an activator) or a liq. silica coupling agent and a carbon black. Pref., the composite material is obtd. by preforming a sulfur-contg. organosilicon compd. [e.g. 3,3'-bis(trimethoxysilylpropyl)disulfide]- based silica coupling agent and a carbon black having a DBP absorption of 280-600 cm3/100 g and a BET value of 550-1,200 m2/g.
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