Patent ID: 7338742

Claim:
A photoresist polymer comprising a repeating unit represented by Formula 2: wherein R is CH 2 , CHCH 3 , or C(CH 3 ) 2 ; R′ and R″ are individually H or CH 3 ; R 1 , R 2 , R 3 , R 4 , and R 5 are individually H, F, C 1 –C 20 alkyl, C 1 –C 20 perfluoroalkyl, C 1 –C 20 alkyl comprising an ether group (—O—), C 1 –C 20 perfluoroalkyl comprising an ether group (—O—), C 1 –C 20 alkyl partially substituted with F, or C 1 –C 20 alkyl comprising an ether group and partially substituted with F; and, m is an integer ranging from 0 to 3, and k is an integer ranging from 10 to 150.