Patent ID: 6995226

Claim:
A ring-opened metathesis copolymer comprised of repeating units represented by the following general formula (1) and repeating units represented by the following general formula (2) or formula (3), wherein the ratio of the number of hydroxyl groups to the number of the total repeating units is in the range of 5% to 100%, and said copolymer has a weight average molecular weight in the range of 1,000 to 500,000 as measured by gel permeation chromatography and expressed in terms of the molecular weight of polystyrene; wherein at least one of R 1 to R 4 is a substituent having a hydroxyl group (—OH), other than a hydroxycarbonyl group, and the remainder of R 1 to R 4 is a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a group containing a halogen atom, a silicon atom,an oxygen atom or a nitrogen atom, other than a hydroxyl group and a hydroxycarbonyl group, and m is an integer of 0 to 2; wherein R 5 , R 6 , R 7 and R 8 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and one of R 5 and R 6 may form a ring together with one of R 7 and R 8 , and n is an integer of 1 or 2; and wherein R 9 , R 10 , R 11 and R 12 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, provided that one of R 9 and R 10 forms a ring together with one of R 11 and R 12 .