| abstract |
The present invention relates to a first step of kneading a rubber component, a filler, a compound represented by the formula (I) or a salt thereof, a second step of kneading a kneaded product, a sulfur component and a vulcanization accelerator obtained in the first step, and a second step. Provided is a method of reducing the copper magnification of a vulcanized rubber including a third step of heat treating the kneaded product obtained in the step. (In the general formula (I), n represents an integer of 0 to 10.) It is preferable that the compound represented by general formula (I) or its salt is S- (3-aminopropyl) thiosulfate or its salt. |