Patent ID: 7015293

Claim:
A cyclic olefin addition copolymer comprising at least one repeating unit (a) selected from repeating units represented by formula (1-1), wherein R 1 to R 20 each independently represent a substituent group selected from the group consisting of a hydrogen atom, a halogen atom, a hydrocarbon, and a halogenated hydrocarbon group having 1 to 20 carbon atoms; and a repeating unit (b) represented by formula (2), wherein A 1 to A 4 each independently represent a hydrogen atom, a halogen atom or a hydrocarbon or halogenated hydrocarbon group having 1 to 20 carbon atoms, and m is 0 or 1; wherein said cyclic olefin addition copolymer is obtained by addition polymerization of a tricycloolefin compound which forms the repeating unit (a) after addition polymerization and the ratio of the endo-form (stereoisomer) of said tricycloolefin compound is 80% or more, and optionally further hydrogenating said copolymer when an olefinic unsaturated bond exists therein, said cyclic olefin addition copolymer being homogeneously soluble in any one of toluene, cyclohexane and a mixed solvent thereof at 25° C., and having a polystyrene-converted number average molecular weight ranging from 30,000 to 500,000.