| 摘要 |
PURPOSE:To obtain the title rubber composition, capable of enhancing insufficient tensile strength of unvulcanized rubber, having excellent molding processability and useful for tires, packings, etc., by blending unvulcanized rubber with a hydrogenated block copolymer and an acid-modified substance thereof. CONSTITUTION:The aimed rubber composition, obtained by blending (A) 100 pts.wt. at least one of natural rubber, isoprene rubber, butadiene rubber, styrene- butadiene random copolymer rubber and butyl rubber with (B) 1-100 pts.wt. block copolymer consisting of (i) vinyl aromatic compound polymer blocks and (ii) olefinic compound polymer blocks and having an unsaturation degree without exceeding 20% and/or a modified block copolymer having molecular units, containing carboxylic acid groups or derivative groups linked thereto, (C) a vulcanizing agent and, as necessary, (D) an additive, such as filler or softener, having a high green strength and excellent mechanical properties as rubber after vulcanization. |
