申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20150253666A1
公开(公告)日:2015-09-10
A positive resist composition is provided comprising a polymer comprising recurring units having a carboxyl or phenolic hydroxyl group substituted with an acid labile group and recurring units of 4-pyrone ester, and having a Mw of 1,000-500,000. The resist composition has a satisfactory effect of suppressing acid diffusion and a high resolution, and forms a pattern of good profile and minimal edge roughness after exposure.