Patent ID: 7651831

Claim:
A positive photoresist composition comprising: a radiation sensitive acid generator: and a polymer, the polymer comprising: (i) a first repeating unit derived from a fluorosulfonamide monomer including one of the following two structures, in which M comprises a poymerizable backbone moiety, Z comprises a linking moiety comprising one of —C(O)O—, —C(O)—, 13 OC(O)—, —O—C(O)—C(O)—O—, R 1 represents one of an akylene, a cycloalkylene, an arylene, a semi- or perfluorinated alkylene, a semi- or perfluorinated cycloalkylene, and a semi- or perfluorinated arylene, p and q is 0 or 1, R 2 represents one of hydrogen, fluorine, an alkyl group of 1 to 6 carbons, and a semi- or perfluorinated alkyl group of 1 to 6 carbons, n is an integer from 1 to 6, and R 3 represents one of hydrogen, an alkyl, an aryl, a semi- or perfluorinated alkyl, and a semi- or perfluorinated aryl, and ii) a second repeating unit including a pendant acid-labile moiety, and iii) a repeating unit including a lactone moiety; and said polymer contains about 15-30 mole % of said repeating unit i), about 30-50 mole % of said repeating unit ii), and about 35-45 mole % of said repeating unit iii).