Patent ID: 7264914

Claim:
A polymer comprising a repeat unit derived from (a) at least one repeat unit derived from an ethylenically unsaturated compound having at least one fluorine atom covalently attached to an ethylenically unsaturated carbon atom; and (b) at least one repeat unit derived from an ethylenically unsaturated compound having the structure: wherein n is 0, 1, or 2; R 1 , R 2 , R 3 and R 4 are independently H, OR 5 , halogen, alkyl or alkoxy of 1 to 10 carbon atoms, optionally substituted by halogen or ether oxygens, Y, C(R f )(R f ′)OR 5 , R 6 Y or OR 6 Y; Y is COZ or SO 2 Z; R 5 is hydrogen or an acid-labile protecting group; R f and R f ′ are the same or different fluoroalkyl groups of 1 to 10 carbon atoms or taken together are (CF 2 ) m where m is 2 to 10; R 6 is an alkylene group of 1 to 20 carbon atoms, optionally substituted by halogen or ether oxygen; Z is OH, halogen, or OR 7 ; and R 7 is an alkyl group of 1 to 20 carbon atoms, with the proviso that at least one of R 1 , R 2 , R 3 and R 4 is Y, OR 5 , C(R f )(R f ′)OR 5 , R 6 Y or OR 6 Y, and the proviso that if R 1 (or R 3 ) is OH, R 2 (or R 4 ) is not OH or halogen.