To provide a material soluble in either one of toluene, cyclohexane and their mixture at 25°C, excellent in optical transparency, heat resistance and stiffness, having a small expansion coefficient and suitable for sheets, films and thin films for optical materials.
A cyclic olefin-based addition copolymer is obtained by addition polymerization of a cyclic olefin compound having a side chain substituent of a cyclic structure such as endo-tricyclo[4.3.0.12,5]deca-3, 7-diene, endo-tricyclo[4.3.0.12,5]dec-3-ene or the like or hydrogenation after the polymerization, or copolymerization of the compound with another cyclic olefin compound such as bicyclo[2.2.1]hept-2-ene or the like, a cyclic olefin compound having a hydrolyzable silyl group or hydrogenation after the copolymerization. A composition for crosslinking is obtained by adding a specific crosslinking agent to the addition copolymer. A crosslinked product is obtained by crosslinking the composition. The optical materials comprise the copolymer, the composition or the crosslinked product. The method for producing the copolymer is to carry out the addition polymerization by using a specific nickel catalyst.
SAKAI TATSUYA
OKITA KENZO
TSUBOUCHI TAKASHI
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