Patent ID: 6875819

Claim:
A fluorine-containing cycloolefin polymer having at least a repeated unit structure represented by the following formula (1) and having an absorption coefficient of not more than 3.0 μm −1 at 157 nm of ultraviolet rays; wherein at least one of R 1 to R 12 and X 1 is the following fluorine or fluorine-containing group, R 1 to R 12 are each fluorine or a fluorine-containing group selected from a fluorine-containing alkyl group of 1 to 20 carbon atoms, a fluorine-containing aryl group of 1 to 20 carbon atoms, a fluorine-containing and silicon-containing alkyl group of 1 to 20 carbon atoms, a fluorine-containing alkoxy group of 1 to 20 carbon atoms, a fluorine-containing and ether group-containing alkyl group of 2 to 20 carbon atoms, a fluorine-containing alkoxycarbonyl group of 2 to 20 carbon atoms, a fluorine-containing alkylcarbonyl group of 2 to 20 carbon atoms, a fluorine-containing and ester group-containing alkyl group of 3 to 20 carbon atoms, a fluorine-containing and carboxyl group-containing alkyl group of 2 to 20 carbon atoms, a fluorine-containing and cyano group-containing alkyl group of 2 to 20 carbon atoms, a fluorine-containing and chlorine-containing alkyl group of 1 to 20 carbon atoms, a fluorine-containing and bromine-containing alkyl group of 1 to 20 carbon atoms, and a fluorine-containing and iodine-containing alkyl group of 1 to 20 carbon atoms, X 1 is a fluorine-containing group selected from —CR a R b —, —NR a — and —PR a — (with the proviso that at least one of R a and R b in —CR a R b — and R a in —NR a — and —PR a — are each selected from fluorine, a fluorine-containing alkyl group of 1 to 20 carbon atoms, a fluorine-containing and silicon-containing alkyl group of 1 to 20 carbon atoms, a fluorine-containing alkoxy group of 1 to 20 carbon atoms, a fluorine-containing and ether group-containing alkyl group of 2 to 20 carbon atoms, a fluorine-containing alkoxycarbonyl group of 2 to 20 carbon atoms, a fluorine-containing alkylcarbonyl group of 2 to 20 carbon atoms, a fluorine-containing and ester group-containing alkyl group of 3 to 20 carbon, a fluorine-containing and carboxyl group-containing alkyl group of 2 to 20 carbon atoms, a fluorine-containing and cyano group-containing alkyl group of 2 to 20 carbon atoms, a fluorine-containing and chlorine-containing alkyl group of 1 to 20 carbon atoms, a fluorine-containing and bromine-containing alkyl group of 1 to 20 carbon atoms, and a fluorine-containing and iodine-containing alkyl group of 1 to 20 carbon atoms), X 1 may be selected from —O— and —S—, at least two of R 1 , R 2 , R 11 and R 12 may be bonded to each other to form a cyclic structure, and n is 0 or an integer of 1 to 3.