Patent ID: 7666574

Claim:
A positive photosensitive composition comprising: (A) a resin that has an acid decomposable repeating unit represented by formula (I) and increases its solubility in an alkali developer by action of an acid; (B) a compound generating an acid in irradiation with actinic light or radiation; (C) a resin that contains neither fluorine nor silicon and has at least one repeating unit selected from repeating units represented by formulas (C-I) to (C-III); and (D) a solvent, wherein, in the formula (I), Xa 1 represents a hydrogen atom, an alkyl group, a cyano group or a halogen atom, Ry 1 to Ry 3 each independently represents an alkyl group or a cycloalkyl group, and at least two of Ry 1 to Ry 3 may be coupled to form a ring structure, and Z represents a divalent linking group, wherein, in the formulas (C-I) to (C-III), R 1 s each independently represents a hydrogen atom or a methyl group, R 2 s each independently represents a hydrocarbon group having at least one —CH 3 partial structure, P 1 represents a single bond or a linking group having an alkylene group, an ether group or two or more thereof, P 2 represents a linking group selected from —O—, —NR— (in which R represents a hydrogen atom or an alkyl group) and —NHSO 2 —, and n stands for an integer from 1 to 4; and wherein the amount of the resin (C) is from 0.1 to 5 mass % based on total solids content of the composition.