Patent ID: 7202015

Claim:
A positive photoresist composition containing: (A) a resin which contains at least one of a repeating unit represented by the formula (IA) and a repeating unit represented by the formula (IB), and is decomposed by an action of an acid and shows an increase in a solubility in an alkali developer; and (B) as compounds capable of generating an acid upon irradiation with one of an actinic ray and a radiation, at least two compounds selected from the group consisting of: (B1) a compound capable of generating an aliphatic or aromatic sulfonic acid substituted by at least one fluorine atom upon irradiation with one of an actinic ray and a radiation; (B2) a compound capable of generating an aliphatic or aromatic sulfonic acid containing no fluorine atom upon irradiation with one of an actinic ray and a radiation; (B3) a compound capable of generating an aliphatic or aromatic carboxylic acid substituted by at least one fluorine atom upon irradiation with one of an actinic ray and a radiation; and (B4) a compound capable of generating an aliphatic or aromatic carboxylic acid containing no fluorine atom upon irradiation with one of an actinic ray and a radiation; wherein Ra, Rb and Rc each independently represents a hydrogen atom, a methyl group, a fluorine atom or a fluoroalkyl group; n is 0 or 1; Y represents a fluorine atom or a fluoroalkyl group; u is an integer of from 1 to 5; L and M each independently represents a methylene group, an oxygen atom or an ester group; and R 11 to R 16 each independently represents a hydrogen atom, a fluorine atom or a fluoroalkyl group, provided that at least one of R 11 to R 16 represents a fluorine atom or a fluoroalkyl group.