| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for improving environment-dependency of the physical properties of rubber, particularly the temperature-dependency of its dynamic modulus, by admixing a filler and a specific N-alkenylamide to raw rubber. SOLUTION: This method comprises admixing, to (A) raw rubber (e.g. natural rubber or synthetic rubber such as styrene-butadiene copolymer rubber), (B) a filler (e.g. carbon black and silica) and (C) an N-alkenylamide shown by the formula [R1-R5 are each H, an alkyl, an alkenyl, or the like; R1 and R2 or R2 and R3 can bind each other together with a benzene ring to form a (tetrahydro)naphthalene ring; R6 and R7 are H or an alkenyl, and at least one of R6 and R7 is/are an alkenyl] (e.g. N-allylbenzamide), preferably at B/A and C/A weight ratios of about 0.2-1.5 (in the case of carbon black and silica) and about 0.03-0.4, respectively.
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