Patent ID: 7169532

Claim:
A chemically amplified positive photoresist composition for a tick 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 the following components: (A) a compound that generates an acid upon irradiation with active light or radiation; (B) a resin tat displays increased alkali solubility under the action of the acid; and (C) an alkali-soluble resin; wherein said component (B) comprises a resin formed from a copolymer containing a structural unit (bi) represented by a general formula (1) shown below: (wherein, R 1 represents a hydrogen atom or a methyl group, and R 2 represents an acid-labile group), and wherein said component (C) comprises an acrylic resin (c1), and/or a vinyl resin (c2), wherein said vinyl resin (4) is a poly(vinyl low alkyl ether), and comprises a (co)polynier produced by polyrnerizing either a single vinyl low alkyl ether represented by a general formula (8) shown below, or a mixture of two or more of said ethers. (wherein in the general formula (8), R 12 represents a straight chain or branched alicyl group of 1 to 5 carbon atoms).