Patent ID: 9366963
Filing Date: 2016-06-14
CPC Classification: C08F,C08L,C09D,G03F,H01L

Claim Text:
1. A chemically amplified resist composition comprising a polymer comprising recurring units (a) of the general formula (1) and having a weight average molecular weight of 1,000 to 500,000 as base resin, an organic solvent and an acid generator, wherein R 1 is hydrogen or methyl, X is a single bond or —C(═O)—O—R 5 —, R 2 is a single bond or C 1 -C 4 alkylene group, R 3 is a linear C 3 -C 8 alkylene group, R 4 is an acid labile group, R 5 is a single bond or C 1 -C 4 alkylene group, and a is in the range: 0<a≦1.0, said acid labile group being selected from among substituent groups of the following formulae (A-1) to (A-3): wherein R L30 is a tertiary alkyl group of 4 to 20 carbon atoms, a trialkylsilyl group in which each alkyl moiety has 1 to 6 carbon atoms, an oxoalkyl group of 4 to 20 carbon atoms, or a group of formula (A-3), letter A1 is an integer of 0 to 6, R L31 and R L32 are hydrogen or straight, branched or cyclic alkyl groups of 1 to 18 carbon atoms, R L33 is a monovalent hydrocarbon group of 1 to 18 carbon atoms which may contain a heteroatom, or a pair of R L31 and R L32 , R L31 and R L33 , or R L32 and R L33 may bond together to form a ring having 3 to 10 carbon atoms with the carbon and oxygen atoms to which they are attached, and R L34 , R L35 and R L36 each are a straight, branched or cyclic C 1 -C 20 alkyl group or straight, branched or cyclic C 2 -C 20 alkenyl group which may contain a heteroatom, or a pair of R L34 and R L35 , R L34 and R L36 , or R L35 and R L36 may bond together to form a C 3 -C 20 aliphatic ring with the carbon atom to which they are attached.