| abstract |
PURPOSE: To provide a tire which has a tread compsn. obtd. by curing a formulation consisting of rubber, hardener, carbon black and specific working assistant and is improved in handling durability, pressure resistant ductility and low heat build-up. n CONSTITUTION: (A) At least one kind of the rubber (e.g. natural rubber, cis- polyisoprene, etc.), of 100 pts.wt. (hereafter pts.), (B) 0.2 to 5 pts., preferably 0.5 to 1.5 pts. hardener, (C) 30 to 100 pts., preferably 50 to 80 pts. carbon black and (D) 0.5 to 10 pts., preferably 2 to 5 pts. working assistant consisting of D 1 : 12-50C paraffin wax and D 2 : pentaerithritol tetrastearate, having D 2 :D 1 =12:1 to 2:1, preferably 8:1 to 5:1 (by weight) and further contg. a support (e.g. calcium carbonate) are compounded. n COPYRIGHT: (C)1989,JPO |