| 摘要 |
PROBLEM TO BE SOLVED: To provide a block copolymer which is excellent in the processability at the time of making a rubber composition and which is crosslinked to make possible a crosslinked rubber composition excellent in the tensile characteristics, wear resistance, weatherability, ozone resistance and heat aging characteristics, and to provide a rubber composition containing it and a molded article. SOLUTION: The block copolymer at least comprises two of polymer blocks having an ethylenically unsaturated bond and another polymer block which lies between these polymer blocks and has a weight-average molecular weight in the range of 5,000-100,000 and the uniformity thereof, with the above ethylenically unsaturated bond-containing polymer block having a weight-average molecular weight in the range of preferably 1,000-20,000. COPYRIGHT: (C)2006,JPO&NCIPI
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