To provide a method for improving heat resistance possessed by vulcanized rubber more simply in the field of automobile tires.
There are provided: a use of a composition, obtained by mixing a condensation reaction product of aniline and acetone with a dicarboxylic acid, for improving heat resistance possessed by vulcanized rubber; and a method for improving heat resistance possessed by vulcanized rubber including the following steps (1), (2) and (3). The step (1) is to bring a mixture containing 2,2,4-trimethyl-1,2-dihydroquinoline and a polymer thereof and, with respect to 100 pts.mass total thereof, 2-6 pts.mass of a primary amine, into contact with 3-10 moles of a dicarboxylic acid with respect to 1 mole of the primary amine. The step (2) is to knead the mixture obtained in the step (1) with a rubber component and a sulfur component. The step (3) is to vulcanize the kneaded product obtained in the step (2), thereby obtaining the vulcanized rubber.
MAEDA HIROSHI
TAKEUCHI KENICHI
OTA YOSHITERU
坂元 徹
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