TREAD RUBBER COMPOSITION FOR TIRE

摘要

PURPOSE:To obtain the subject treat rubber composition, containing a diene- based rubber, etc., and excellent in performance both on ice and on snow with a nonspike tire and containing a hard filler in a rubber component after extracting a vulcanized rubber with acetone and chloroform at a specific ratio. CONSTITUTION:The tread rubber composition obtained by adding (B) at least one of silica and carbon black to (A) a diene-based rubber, extracting a vulcanized rubber with acetone and chloroform so as to provide the amount (E) of the extract with the acetone and chloroform at a ratio of E<0.4(A-38) [A is the sum of carbon black based on 100 pts.wt. rubber content after extracting the vulcanized rubber with the acetone and chloroform and (1/2) silica] based on 100 pts.wt. rubber component after extracting the vulcanized rubber with the above-mentioned acetone and chloroform and then adding (C) a hard filler having 0.01-5mm average particle diameter and >=100kg/cm<2> Knoop hardness in an amount of 3-80 pts.wt. (based on 100 pts.wt. rubber component after extraction with the acetone and chloroform) thereto.