Patent ID: 7537879

Claim:
A photoresist composition comprising a photoacid generator and a polymer comprising at least one unit as described by structure 1, where, structure 1 is free of fluorination; A is a nonaromatic polymer backbone; W is a single bond or a nonaromatic linking group; m is present and to 10; further, either, R 5 and R 6 are connected to form a cyclic unit, and R 4 is independently hydrogen, (C 1 -C 18 ) alkyl, SO 2 R 7 , C(O)R 7 , (CH 2 ) n SO 2 R 7 , (CH 2 ) n COR 7 , (CH 2 ) n OR 7 , CO 2 (CH 2 ) n CO 2 R 7 , O(CH 2 ) n CO 2 R 7 , (CH 2 ) n CO 2 R 7 , acidic moiety protected with an acid labile group, and where R 7 is selected from hydrogen, (C 1 -C 18 ) linear, branched or cyclic alkyl, further where R 5 and R 6 are independently selected from (C 1 -C 18 ) linear, branched or cyclic alkyl, (CH 2 ) n SO 2 R 7 , (CH 2 ) n COR 7 , (CH 2 ) n OR 7 , (CH 2 )nCO 2 R 7 , where R 7 is selected from (C 1 -C 18 ) linear, branched or cyclic alkyl; or, R 5 and R 6 are connected to form a cyclic unit and R 4 and R 5 are connected to form an alky cyclic structure, or R 4 and R 5 are connected to from an alkyl cyclic structure containing within the cyclic structure suflone, ether, carbonyl, and carboxyl moieties where R 4 , R 5 and R 6 are independently selected from (C 1 -C 18 ) linear, branched or cyclic alkyl, (CH 2 ) n SO 2 R 7 , (CH 2 ) n COR 7 , (CH 2 ) n OR 7 , (CH 2 )nCO 2 R 7 , where R 7 is selected from (C 1 —C 18 ) linear, branched or cyclic alkyl; and n=1-18.