Patent ID: 7981589

Claim:
A polymer comprising recurring units derived from a fluorinated monomer having the general formula (1): wherein R 1 is hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 20 carbon atoms in which any constituent —CH 2 — moiety may be replaced by —O — or —C(═O)—, R 2 is hydrogen, fluorine, methyl or trifluoromethyl, R 3 and R 4 are each independently hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 8 carbon atoms, or R 3 and R 4 may bond together to form an aliphatic hydrocarbon ring with the carbon atom to which they are attached, and A is a straight, branched or cyclic divalent hydrocarbon group of 1 to 6 carbon atoms.