Patent ID: 6727039
Filing Date: 2004-04-27
Classification: G03F,Y10S

Abstract:
A positive photoresist composition comprising:(A) a resin containing a repeating structural unit represented by formula (I) below and at least one of repeating structural units represented by formulas (IIa), (IIb) and (IIc) below, the resin being capable of increasing the solubility in an alkali developer by the action of acid; and (B) a compound capable of generating an acid by irradiation with one of an actinic ray and radiation: â€ƒwherein R11, R12, R13 and R14 each represents a hydrogen atom or an alkyl group; and a represents 0 or 1; â€ƒwherein R0 represents a hydrogen atom or a lower alkyl group; A represents a single bond, or a group or combination of two or more groups selected from the group consisting of an alkylene group, a cycloalkylene group, an ether group, a thioether group, a carbonyl group and an ester group; R1 and R2 each represents a lower alkyl group; R3, R4, R5, R6, R7 and R8 each represents a hydrogen atom, a lower alkyl group, a lower alkoxyl group or a halogen atom; R3 and R4, or R5 and R6, may form a carbonyl group together; and R3 and R5 may be linked to form an alkylene chain; k and l each represents an integer of from 2 to 5; R15 represents a lower alkyl group, a lower alkoxyl group or a halogen atom; and m represents an integer of from 0 to 3.