Patent ID: 6878501

Claim:
A polymer comprising recurring units of compound of formula (1): wherein A is a divalent aliphatic or alicyclic hydrocarbon group of 2 to 20 carbon atoms, R 1 is selected from formulae (3)-3, (3)-4, (3)-5, (3)-6, (3)-7, (3)-8, and (3)-9 “a” is a positive number of 1 to 3, R is a single bond, methylene group, oxygen atom, NH group or sulfur atom, R 2 and R 3 each are a single bond or methylene group, R 5 is a fluorinated alkyl group which optionally contains an ether or ester bond, R 6 and R 11 are, each independently, hydrogen or a straight alkyl group of 1 to 11 carbon atoms, R 7 is hydrogen, a straight alkyl group of 1 to 10 carbon atoms, or —C═O—R 12 , R 12 is hydrogen or a straight alkyl group of 1 to 10 carbon atoms, and R 8 is an alkylene group of 1 to 10 carbon atoms, and either one or both of R 9 and R 10 are alkyl groups of 1 to 5 carbon atoms having at least one fluorine atom substituted thereon.