Patent ID: 8158326

Claim:
A photosensitive composition comprising (A) a compound which, upon irradiation with one of an actinic ray and a radiation, generates an acid represented by one of formulae (I) and (I′): wherein A 1 represents an alkylene group whose alkylene chain may have an oxygen or sulfur atom or a connecting group represented by —C(═O)— group or ester group therein; A 2 and A 3 each independently represents a single bond, an oxygen atom, or —N(Rx)-; Rx represents an aryl group, an alkyl group, or a cycloalkyl group; A 4 represents a single bond or —C(═O)—; Ra represents a group selected from the group consisting of an ethyl group, a n-propyl group, a n-butyl group, a n-pentyl group, a n-hexyl group, a n-octyl group, a n-dodecyl group, a n-tetradecyl group, a n-octadecyl group, a branched alkyl group, a cycloalkyl group, an aryl group which has a substitutent, an aralkyl group, and an alkenyl group; n represents 2 or 3; Rb represents a connecting group having a valence of n; and when A 3 is —N(Rx)-, Rx is bonded to one of Ra and Rb to form a ring; and (B) a resin which decomposes by an action of an acid to increase a solubility of the resin in an alkaline developer.