Patent ID: 7371505

Claim:
A positive photosensitive composition comprising (A) a resin increasing the solubility in an alkaline developer by the action of an acid wherein the resin (A) is a resin having a repeating unit containing a structure of formula (I), wherein: X represents an oxygen atom, a sulfur atom or —C(═O)—; Lc represents a group for forming a lactone; Ra 1 and Ra 2 each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an acyl group, or an acid decomposable group; Ra 3 represents a carboxyl group, an alkyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyl group, or a group having an acid decomposable group; two of Ra 1 to Ra 3 may combine together to form a ring; n represents an integer of 1 or 2; n 1 and n 2 each represents an integer of from 0 to 3, with proviso that (n 1 +n 2 ) represents an integer of from 1 to 6; and n 3 represents an integer of from 0 to 3.