Patent ID: 7947421

Claim:
A positive resist composition for immersion exposure comprising: (A) a resin having an alicyclic hydrocarbon structure, wherein the resin is capable of increasing a solubility of the resin (A) in an alkaline developer by an action of an acid; and (B) a compound capable of generating an acid upon irradiation with one of an actinic ray and radiation, wherein the resin (A) includes a component having a molecular weight of 1,000 or less in an area ratio of 20% or less to an entire area in a pattern area by gel permeation chromatography, wherein the resin (A) has a weight average molecular weight of from 7,000 to 50,000, and a degree of dispersion (weight average molecular weight/number average molecular weight) of 1.5 or less, wherein the resin (A) has a repeating unit having a lactone structure, and wherein the resist composition has a concentration of an entire solid content of from 2.0 to 6.0 mass %.