Patent ID: 7960087

Claim:
A positive photosensitive composition comprising: (A) a resin having at least one repeating unit having a lactone structure at a side chain, at least one repeating unit having an alicyclic hydrocarbon structure substituted with a polar group represented by the following formulae (VIIa) or (VIIb), and at least one acid-decomposable repeating unit selected from the group consisting of four acid-decomposable units 13, 14, 15 and 19 shown below, the resin being capable of decomposing by the action of an acid to increase the solubility in an alkali developer, in which the lactone structure is represented by any of the following formulae (I-1) to (I-4); and (B) a compound capable of generating an acid represented by the following formula (II-1) or (II-2) upon irradiation with an actinic ray or a radiation: in formula (VIIa), R 2c , R 3c and R 4c each represents a hydrogen atom, a hydroxyl group, or a cyano group, provided that at least one of R 2c , R 3c and R 4c represents a hydroxyl group or a cyano group; in formulae 13, 14, 15 and 19, Rx represents H, CH 3 , CF 3 , CH 2 OH or Rxa, and Rxa represents an alkyl group having from 1 to 4 carbon atoms; in formulae (I-1) to (I-4), Ra 1 each represents an organic group; X represents —CH 2 —, —CH 2 CH 2 —, or an oxygen atom; and n 1 represents an integer of from 0 to 3; in formulae (II-1) and (II-2), Rc 3 , Rc 4 and Rc 5 each represents an organic group, and Rc 3 and Rc 4 may be bonded to form a ring.