| abstract |
PURPOSE: To stabilize motive performance of a tyre by fabricating the tyre through predetermined combination of mixture consisting of styrene butadiene copolymerization rubber with high styrene content, butyl rubber, and butadiene acryl nitryl copolymerization rubber and softening agents of petroleum family in addition to plasticizer of ester family. n CONSTITUTION: 100% weight part of material rubber made from either styrene butadiene copolymerization rubber with high stylene content or a compound, in which this copolymerization rubber is mixed with one or more kinds of butyl rubber, butyl rubber halogenide, or butadiene acryl copolymerization rubber, is combined with softening agents of petroleum family such as processed oil of paraffin family and plasticizer of ester family such as phthalic acid ester etc. in such a manner that the total of the latter two is 5W300% weight part and moreover the plasticizer of ester family is 5W 60% weight part and at the same time it lies in the weight part range between [0.137 ×(content of styrene in %)+1.781] and [0.685×(content of styrene in %)+13.904], and then the whole things are vulcanized. With this constitution, variation in motive performance of a tyre with temperature can be reduced, thereby obtaining stable motive performance. n COPYRIGHT: (C)1985,JPO&Japio |