Patent ID: 8278022

Claim:
A positive resist composition comprising: a base material component (A) that exhibits increased solubility in an alkali developing solution under action of an acid; and an acid generator component (B) that generates an acid upon exposure, wherein the base material component (A) comprises a compound (A1) having a structure (I-1): wherein each of R 101 to R 105 independently represents an alkyl group of 1 to 10 carbon atoms or an aromatic hydrocarbon group which may include a heteroatom therein; wherein Z 1 , Z 2 and Z 3 independently represent an acid-dissociable, dissolution inhibiting group or a hydrogen atom and one or more of Z 1 , Z 2 and Z 3 is an acid-dissociable, dissolution inhibiting group; each of b 1 b 2 and b 3 represents an integer of 1 or more, and each of n1 through n5 independently represents an integer of 0 or more, with the proviso that b 1 +n3+n4, b 2 +n1+n2 or b 3 +n1+n2 is not greater than 4; b 2 +n1+n2+n5 is not greater than 5, b 3 +n1+n2+n5 is not greater than 5; n0 is 4; and A represents a tetravalent linking moiety.