Patent ID: 9250518
Filing Date: 2016-02-02
CPC Classification: G03F

Claim Text:
1. A resist composition comprising: a base polymer comprising recurring units (a1) derived from (meth)acrylate, styrenecarboxylic acid or vinylnaphthalenecarboxylic acid having an acid labile group substituted thereon, or recurring units (a2) derived from hydroxystyrene having an acid labile group substituted thereon, as represented by the general formula (2): wherein R 9 and R 11 are each independently hydrogen or methyl, X is a single bond, a C 1 -C 12 linking group having an ester moiety or lactone ring, phenylene group or naphthylene group, Y is a single bond or ester group, and R 10 and R 12 are each independently an acid labile group, and a sulfonium salt having the general formula (1)-1 or a iodonium salt having the general formula (1)-2, wherein R 1 is hydrogen, or a straight, branched or cyclic C 1 -C 30 alkyl, C 6 -C 30 aryl, C 7 -C 30 aralkyl, C 2 -C 30 alkenyl, C 2 -C 10 alkenyl, or C 4 -C 12 heterocyclic-bearing group, or a combination of such groups, which group may contain a hydroxyl, mercapto, carboxyl, ether, thio ether, ester, sulfonic acid ester, sulfonyl, lactone ring, carbonyl, cyano, nitro, halogen, trifluoromethyl, amide, imide, sulfonamide, carbonate, sulfide, —N═CR—O—, —N═CR—S—, or ═N—O—N=moiety, or R 1 may be an acid labile group; R is hydrogen, mercapto, hydroxyl or C 1 -C 3 alkyl, or may bond with the nitrogen atom in formula (1) to form a ring; R 2 and R 3 each are hydrogen, a straight or branched C 1 -C 4 alkyl group or C 2 -C 4 alkenyl group, or R 2 and R 3 may bond together to form a ring with the carbon atom to which they are attached; R 4 , R 5 and R 6 are each independently a straight, branched or cyclic C 1 -C 12 alkyl, alkenyl, oxoalkyl or oxoalkenyl group, C 6 -C 20 aryl, C 7 -C 12 aralkyl or aryloxoalkyl group, in which at least one hydrogen atom may be substituted by an ether, ester, carbonyl, carbonate, hydroxyl, carboxyl, halogen, cyano, amide, nitro, sultone, sulfonic acid ester, sulfone moiety, or sulfonium salt-containing substituent, R 4 and R 5 may bond together to form a ring with the sulfur atom to which they are attached; R 7 and R 8 each are a C 6 -C 20 aryl group which may contain a straight, branched or cyclic C 1 -C 10 alkyl or alkoxy moiety, and m is an integer of 2 to 8.