Cyclic olefin addition copolymer and process for producing same, crosslinking composition, crosslinked product and process for producing same, and optically transparent material and application thereof

A process for producing a cyclic olefin addition copolymer which comprises a repeating unit (a) shown by the following formula (1) and a repeating unit (b) shown by the following formula (4), and has a number average molecular weight of 10,000 to 1,000,000:

• 21
• wherein A1 to A4 individually represent a hydrogen atom, a halogen atom, an alkyl group, alkenyl group, cycloalkyl group, or aryl group having 1-20 carbon atoms, or a reactive silyl group shown by the following formula (2) or (3), provided that at least one of A1 to A4 represents the reactive silyl group, X represents —CH2— or —O—, and m is either 0 or 1;
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• wherein R1, R2, and R3 individually represent a hydrogen atom or a hydrocarbon group having 1-20 carbon atoms, n is an integer from 0 to 5, and Y represents a hydrocarbon residue of an aliphatic diol, an alicyclic diol, or an aromatic diol having 2-20 carbon atoms;
• 23
• wherein R1 and R2 individually represent a hydrogen atom or a hydrocarbon group having 1-20 carbon atoms, n is an integer from 0 to 5, and Z represents a hydrocarbon residue of an aliphatic triol, an alicyclic triol, or an aromatic triol having 4-20 carbon atoms;
• 24
• wherein B1 to B4 individually represent a hydrogen atom, or a substituent selected from a halogen atom, an alkyl group, cycloalkyl group, aryl group, alkenyl group, halogenated hydrocarbon group, alkoxy group, and allyloxy group having 1-20 carbon atoms, or a polar group shown by —(CH2)kY′ (wherein Y′ represents —C(O)OR4 or —OC(O)R5, R4 and R5 represent a substituent selected from an alkyl group, alkenyl group, cycloalkyl group, and aryl group having 1-20 carbon atoms, and halogen substituted groups of these, and k is an integer from 0 to 5), B1 and B2 or B3 and B4 may form an alkydenyl group, B1 and B3, B and B4, B2 and B3, or B2 and B4 may form a cycloalkylene group or a cycloalkenylene group, and p is an integer from 0 to 2;
• the process comprising copolymerizing a specific monomer (1) having a reactive silyl group shown by the following formula (5) and a specific monomer (2) shown by the following formula (6) in the presence of a polymerization catalyst which comprises at least one compound selected from transition metal compounds of Ni, Co, and Pd:
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• wherein A1, A2, A3, A4, X, and m are the same as defined for the formula (1);
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• wherein B1, B2, B3, B4, and p are the same as defined for the formula (4).