| 摘要 |
PURPOSE: To produce a rubber composition which can give a tire tread having good wettability and low rolling friction without detriment to its breaking strength. CONSTITUTION: This rubber composition containing 100 pts.wt. mixture containing 10-40 pts.wt. stock rubber (A) having a Tg of -40 deg.C to -15 deg.C, 30-85 pts.wt. stock rubber (B) viscoelastically incompatible with stock rubber A and having a Tg at least 20 deg.C-below the Tg of stock rubber A and 5-30 pts.wt. stock rubber (C) viscoelastically compatible with stock rubber A, viscoelastically incompatible with stock rubber B and having a Tg equal to or lower than that of stock rubber A and 30-60 pts.wt. reinforcement is produced by mixing stock rubber B with stock rubber C and at least 80wt.%, based on the total weight, reinforcement at 150-200 deg.C for 10sec or longer with a sealed mixer, adding stock rubber A and the remaining portion of the reinforcement to the mixture and mixing the entire mixture. |
