Patent ID: 7081327

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, comprising: (A) a compound that generates acid on irradiation with active light or radiation; and (B) a resin that displays increased alkali solubility under action of acid; wherein said component (B) comprises a resin formed from a copolymer containing a structural unit (b1), and a structural unit (b2) derived from a polymerizable compound containing an ether linkage, the structural unit (b1) represented by a general formula (1) shown below: (wherein, R 1 represents a hydrogen atom or a methyl group, and R 2 represents a lower alkyl group), and the polymerizable compound containing an ether linkage is a compound represented by a general formula (7) shown below, or phenoxypolyethylene glycol (meth)acrylate, methoxypolypropylene glycol (meth)acrylate, or 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 2 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).