Patent ID: 8614283

Claim:
An acrylic resist polymer consisting essentially of units of at least one (meth)acrylic monomer and units of an acid-decomposable monomer represented by formula (3), wherein the units of the at least one (meth)acrylic monomer comprise a (meth)acrylic monomer having a hydrophilic group, and a percentage in the polymer of the units of the acid-decomposable monomer is 0.01 to 30% by mole: wherein each K 1 and K 2 , independently, represents at least one member selected from the group consisting of alkylene, cycloalkylene, oxyalkylene, arylene, a divalent thiazoline ring, a divalent oxazoline ring and a divalent imidazoline ring; each L 1 and L 2 , independently, represents at least one member selected from the group consisting of —C(O)O—, —C(O)— and —OC(O)—; each M 1 , M 2 and M 3 , independently, represents at least one member selected from the group consisting of an alkylene group, a cycloalkylene group, an oxyalkylene group and an arylene group; k1, k2, l1, l2, m1, m3 and n1 each represent the number of K 1 , K 2 , L 1 , L 2 , M 1 , M 3 and Y 2 , respectively, and are each independently 0 or 1; m2 represents the number of M 2 units and is 1; each R 2 and R 3 , independently, represents a hydrogen atom or a methyl group; and each Y 1 and each Y 2 are, independently, selected from the group consisting of wherein each R 701 , R 702 , R 703 and R 704 , independently, represents a linear, branched or cyclic alkyl or alkenyl group having 1 to 18 carbon atoms or an aryl group, or R 701 , R 702 , R 703 and R 704 each form a cyclic hydrocarbon group together with a carbon atom to which each of them is bonded, each R 707 represents a hydrogen atom, a linear or branched alkyl or alkenyl group having 1 to 4 carbon atoms or an aryl group, where v1 represents an integer of 1 to 5, said units of said at least one (meth)acrylic acid monomer are present in an amount of 50% by mole or more and represented by formula (25): R represents a hydrogen atom or a methyl group, D represents any group which comprises a hydrophilic group or a hydrophilic group, and said hydrophilic group is at least one member selected from the group consisting of —C(CF 3 ) 2 —OH, a hydroxyl group, a cyano group, a methoxy group, a carboxyl group and an amino group.