| 摘要 |
A modified copolymer rubber obtained by kneading at 200 DEG -280 DEG C. (A) at least one copolymer rubber material selected from the group consisting of an ethylene- alpha -olefin copolymer rubber having a number-average molecular weight of 10,000-100,000 and an ethylene content of 15-85% by weight and an ethylene- alpha -olefin-nonconjugated diene copolymer rubber having a number-average molecular weight of 10,000-100,000, an ethylene content of 15-85% by weight and a nonconjugated diene content of 3.0% by weight or less, (B) a free-radical initiator, (C) at least one vinyl aromatic monomer and (D) an unsaturated dicarboxylic anhydride, wherein the weight ratios of (B):(A), (C):(A), (D):(A) and (C):(D) are 0.005-1.0:100, 0.2-20:100, 0.5-15:100 and 0.1-3:1, respectively. The process is suited for industrially producing a modified copolymer rubber having a high bound unsaturated dicarboxylic anhydride content, a low tendency of increase of the Mooney viscosity [ML1+4 (121 DEG C.)], and an excellent moldability and storage stability without being obstructed by gel formation during the kneading. The modified copolymer rubber thus obtained can be advantageously used for thermoplastic elastomer, blending polymer adhesive etc.
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