Patent ID: 6335141
Filing Date: 2002-01-01
Classification: C08F,G03F,Y10S

Abstract:
A chemically amplified positive resist composition comprising(A) an organic solvent, (B) a base resin in the form of a polymer having at least one acid labile group and crosslinked within a molecule and/or between molecules with a crosslinking group having a Câ€”Oâ€”C linkage, the polymer having a weight average molecular weight of 1,000 to 500,000, and (C) a photoacid generator, said base resin having recurring units of the general formula (5a) or (5b) and being prepared by reacting a polymer comprising recurring units of the following general formula (1â€²) and having a weight average molecular weight of 1,000 to 500,000 with an alkenyl ether compound of the following general formula (8a) or (9a) and a compound of the following general formula (10a), â€ƒwherein R1 is a hydrogen atom or methyl group, R2 is a normal, branched or cyclic alkyl group having 1 to 8 carbon atoms, letter x is 0 or a positive integer and y is a positive integer satisfying x+y&lE;5, p1 and p2 each are a positive number, q1 and q2 each are 0 or a positive number satisfying 0â€ƒwherein R8a is a hydrogen atom or normal, branched or cyclic alkyl group having 1 to 7 carbon atoms, R9 is a hydrogen atom or normal, branched or cyclic alkyl group having 1 to 8 carbon atoms, or R8a and R9, taken together, may form a ring with the proviso that R8a is a normal or branched alkylene group having 1 to 7 carbon atoms and R9 is a normal or branched alkylene group having 1 to 8 carbon atoms when they form a ring, R13 is a normal or branched alkylene group having 1 to 10 carbon atoms, A is a c-valent aliphatic saturated hydrocarbon, alicyclic saturated hydrocarbon, aromatic hydrocarbon or heterocyclic group having 1 to 50 carbon atoms, which may have an intervening hetero atom and in which some of the hydrogen atoms attached to carbon atoms may be replaced by hydroxyl groups, carboxyl groups, carbonyl groups or fluorine atoms, B is â€”COâ€”Oâ€”, â€”NHCOâ€”Oâ€” or â€”NHCONHâ€”, letter c is an integer of 2 to 8, and d is 0 or an integer of 1 to 10, â€ƒwherein R4a is a hydrogen atom or normal, branched or cyclic alkyl group having 1 to 7 carbon atoms, R5 is a hydrogen atom or normal, branched or cyclic alkyl group having 1 to 8 carbon atoms, R6 is a monovalent hydrocarbon group of 1 to 18 carbon atoms which may have a hetero atom, or R4a and R5, R4a and R6, and R5 and R6, taken together, may form a ring with the proviso that R4a is a normal or branched alkylene group having 1 to 7 carbon atoms and R5 and R6 each are a normal or branched alkylene group having 1 to 8 carbon atoms when they form a ring, the hydrogen atoms of some phenolic hydroxyl groups in the polymer of formula (1â€²) being reacted with p1 mol of the compound of formula (8a) or (9a) and q1 mol of the compound of formula (10a) per mol of the entire phenolic hydroxyl groups in the polymer of formula (1â€²), thereby forming a polymer having recurring units of the general formula (5a) or (5b): â€ƒwherein R1 and R2 are as defined above, R4 is a hydrogen atom or normal, branched or cyclic alkyl group having 1 to 8 carbon atoms, R5 and R6 are as defined above, or R4 and R5, R4 and R6, and R5 and R6, taken together, may form a ring, with the proviso that R4, R5 and R6 each are a normal or branched alkylene having 1 to 8 carbon atoms when they form a ring, x and y are as defined above, m is 0 or a positive integer, n is a positive integer satisfying m+n=y, p1, p2, q1, and q2 are as defined above, and Q is a group represented by the following formula (4a) or (4b): â€ƒwherein R8 and R9 each are a hydrogen atom or normal, branched or cyclic alkyl group having 1 to 8 carbon atoms, or R8 and R9, taken together, may form a ring, with the proviso that R8 and R9 each are a normal or branched alkylene group having 1 to 8 carbon atoms when they form a ring, R13 is a normal or branched alkylene group having 1 to 10 carbon atoms, A is a c-valent aliphatic saturated hydrocarbon, alicyclic saturated hydrocarbon, aromatic hydrocarbon or heterocyclic group having 1 to 50 carbon atoms, which may have an intervening hetero atom and in which some of the hydrogen atoms attached to carbon atoms may be replaced by hydroxyl groups, carboxyl groups, carbonyl groups or fluorine atoms, B is â€”COâ€”Oâ€”, â€”NHCOâ€”Oâ€” or â€”NHCONHâ€”, letter c is an integer of 2 to 8, câ€² is an integer of 1 to 7, and d is 0 or an integer of 1 to 10.