Patent ID: 7868107

Claim:
A process for producing a cycloolefin addition polymer comprising addition-polymerizing a cycloolefin in the presence of a catalyst comprising a combination of (A) a transition metal compound of Group 4 of the Periodic Table, represented by the following general formula (1), with (B) an organoaluminum oxy compound, and/or (C) a compound capable of reacting with the Group 4 transition metal compound (A) to form an ion pair, wherein M represents a transition metal atom of Group 4 of the Periodic Table; R 1 to R 3 each independently represent a hydrogen atom, a C 1 -C 12 alkyl group, a C 5 -C 12 cycloalkyl group or a C 6 -C 12 aryl group; R 4 and R 5 each independently represent a hydrogen atom, a C 1 -C 12 alkyl group, a C 5 -C 12 cycloalkyl group, a C 6 -C 12 aryl group or a halogen atom; C 5 H 4-x Q x refers to a cyclopentadienyl ring having “x” number of substituents Q, where x is an integer of 1 to 4, and each Q independently represents a C 1 -C 20 hydrocarbon group which may have a halogen atom or atoms as a substituent, or a silyl group which may have a C 1 -C 12 hydrocarbon group or groups as a substituent; wherein two adjacent Qs in the C 5 H 4-x Q x may be bonded, together with the carbon atoms to which the two Qs are attached, to form a cyclic moiety having 4 to 20 carbon atoms whereby the C 5 H 4-x Q x is rendered a polycyclic cyclopentadienyl ring; L is a neutral Lewis base, and y is an integer of 1 or 2.