Patent ID: 9017917
Filing Date: 2015-04-28
Classification: G03F

Abstract:
1. A resist composition comprising two or more polymers, as resin (A), containing a first polymer and a second polymer and a compound that when exposed to actinic rays or radiation, generates an acid, wherein the content of the first polymer based on the resin (A) is in a range of 5 to 40 mass % and the content of the second polymer based on the resin (A) is in a range of 60 to 95 mass %, and wherein when the resist composition is formed into a dry resist film, the mixing ratios of at least the first and second polymers in the resist film exhibit a gradient distribution such that the mixing ratios continuously change in entirety or partially in the direction of the depth from the surface of the resist film on the air side toward a support, and wherein the mixing ratio of the first polymer at a superior portion of the resist film is higher than that of the second polymer, while the mixing ratio of the second polymer at an inferior portion of the resist film is higher than that of the first polymer, and wherein both the first polymer and the second polymer have a repeating unit represented by general formula (AI) indicated below: wherein in general formula (AI): Xa T represents a single bond or a bivalent connecting group, and each of Rx wherein the second polymer contains a unit having any of fluoroalcohol partial structures of general formula FA-1 below: wherein each of the first polymer and the second polymer contains a repeating unit having a lactone structure.