Patent ID: 7927778

Claim:
A chemically amplified positive photoresist composition for a thick film that is used for forming a thick-film photoresist layer with a film thickness of 10 to 150 μm on top of a support, consisting essentially of: (A) a compound that generates acid upon irradiation with active light or radiation; and (B) a resin that displays increased alkali solubility under action of acid; and (C) an alkali-soluble resin; wherein said component (B) comprises (b1) a resin containing a structural unit represented by a general formula (1) shown below, and (b2) a resin consisting of a structural unit represented by a general formula (2) shown below and a structural unit derived from phenoxypolyethylene glycol (meth)acrylate, methoxypolypropylene glycol (meth)acrylate or a compound represented by a general formula (10) shown below, and wherein said alkali-soluble resin (C) comprises at least one resin selected from the group consisting of (c1) novolak resins, (c2) copolymers containing a hydroxystyrene structural unit and a styrene structural unit, (c3) acrylic resins and (c4) vinyl resins (wherein, R1 represents a hydrogen atom or a methyl group, and R2 represents an acid-labile group) (wherein, R 3 represents a hydrogen atom or a methyl group, R 4 represents an alkyl group of 1 to 4 carbon atoms, and X represents a group which, in combination with a carbon atom bonded thereto, forms a hydrocarbon ring of 5 to 20 carbon atoms) CH 2 ═C(R)COO—(C m H 2m —CHR 15 —O) n R″ (10) (wherein, R′ represents a hydrogen atom or a methyl group, R 15 represents a hydrogen atom or an alkyl group of 1 or 2 carbon atoms, R″ represents an alkyl group or aryl group of 1 to 7 carbon atoms that may also contain an oxygen atom, m represents an integer of either 1 or 2, and n represents an integer from 1 to 10).