To provide a cyclic olefin copolymer moldable by solution casting method or the like because of being good in solubility to hydrocarbon solvent, having especially low coefficient of linear expansion and good in dimensional stability while meeting high transparency, heat resistance, chemical resistance, mechanical strengths and low water-absorbing tendency at high levels, to provide a method for producing the copolymer, to provide a crosslinkable composition containing the copolymer, to provide a crosslinked form obtained by crosslinking the composition, and to provide a method for producing such a crosslinked form.
The cyclic olefin copolymer is composed of structural units derived from a cyclic olefin compound having only cyclic structure and structural units derived from a cyclic olefin compound having hydrolyzable silyl group. This copolymer, with no substantial composition distribution, is obtained by addition polymerization using a specific catalytic system. The crosslinkable composition is obtained by compounding the copolymer with an acid generator. The crosslinked form with a residual solvent content of lower than 1.0 wt.% and a coefficient of linear expansion of ≤45 ppm/°C is obtained by crosslinking the composition.
COPYRIGHT: (C)2005,JPO&NCIPI
Mitsutaka Kaizu
Noboru Oshima
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