Patent ID: 7662445

Claim:
A copolymer comprising: 10 to 69 mol % of a structural unit derived from propylene; 1 to 50 mol % of a structural unit derived from at least one α-olefin having a carbon number of from 4 to 20; and 30 to 89 mol % of a structural unit derived from at least one cyclic olefin represented by the following formula (1), wherein the copolymer has a weight average molecular weight of from 50,000 to 1,000,000: wherein R 1 to R 4 each independently represent a hydrogen atom or an alkyl group, at least two of R 1 to R 4 may be combined with each other to form a monocyclic or polycyclic ring, and the monocyclic or polycyclic ring may have a double bond; m represents 0 or 1; and a pair of R 1 and R 2 or of R 3 and R 4 may form an alkylidene group.