| 摘要 |
PROBLEM TO BE SOLVED: To provide a block copolymer with improved heat resistance, processing stability, flex resistance and tensile elongation at break, its manufacturing method, a resin composition and its cured material and an electric part using it. SOLUTION: The block copolymer consists of a structural unit (I) expressed by general formula (1) (wherein, R<SP>1</SP>is a phenylethinyl group, a substituted phenylethinyl group having a 1-30C alkyl group or an alkoxy group or a 3-30C trialkylsilylethinyl group; m is an integer of 1-3; when m is more than one, R<SP>1</SP>may be the same or different) and a structural unit (II)expressed by general formula (2) (wherein, R<SP>2</SP>and R<SP>3</SP>are each a 1-20C alkyl group, a cycloalkyl group or an aryl group and they may be the same or different; n is an integer of 1-200). COPYRIGHT: (C)2005,JPO&NCIPI
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