Patent ID: 7951522

Claim:
A chemically amplified positive photoresist composition for 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 on irradiation with active light or radiation; (B) a resin that displays increased alkali solubility under action of acid; and (C) an alkali-soluble resin; wherein said component (B) consists essentially of a resin formed from a copolymer consisting of a structural unit (b1) represented by a general formula (I) below, and a structural unit derived from a polymerizable compound containing an ether linkage (b2) (wherein, R 1 represents a hydrogen atom or a methyl group, R 2 represents a lower alkyl group, and X represents a group which, in combination with a carbon atom bonded thereto, forms a hydrocarbon ring of 5 to 20 carbon atoms), wherein said polymerizable compound containing an ether linkage is at least one selected from the group consisting of: a compound represented by a general formula (7) shown below, phenoxypolyethylene glycol (meth)acrylate, methoxypolypropylene glycol (meth)acrylate, and tetrahydrofurfuryl (meth)acrylate CH 2 ═C(R′)COO—(C m H 2m —CHR 10 —O) n —R″ (7) (wherein, R′ represents a hydrogen atom or a methyl group, R 10 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).