Patent ID: 7700261

Claim:
A positive photosensitive composition comprising: (A) a compound that generates an acid upon irradiation with actinic ray or radiation; and (B) a resin that increases its solubility in an alkali developer by action of an acid, wherein the resin (B) has a repeating unit that has an acid-decomposable group and is represented by formula (I): wherein Xa 1 represents a hydrogen atom, an alkyl group, a cyano group, or a halogen atom, wherein the alkyl group does not include a fluoroalkyl group, and the halogen atom does not include a fluorine atom; Ry 1 and Ry 2 each independently represents an alkyl group or a cycloalkyl group; Rx represents an alkyl group having 2 or more carbon atoms, or a cycloalkyl group; and Z represents an acyclic alkylene group.