Patent ID: 8759220

Claim:
A patterning process comprising the steps of: (1) forming, on a body to be processed on which a titanium-containing hard mask is formed, an organic underlayer film by using an application-type organic underlayer film composition; (2) forming, on the organic underlayer film, a titanium-containing resist underlayer film by using a composition for forming a titanium-containing resist underlayer film, the composition containing titanium in the amount of 10% to 60% by mass; (3) forming a photoresist film by using a chemically amplified resist composition on the titanium-containing resist underlayer film; (4) after heat-treatment, forming a photoresist pattern by exposing the photoresist film to high energy beam and developing; (5) pattern-transferring onto the titanium-containing resist underlayer film by using the photoresist pattern as a mask; (6) pattern-transferring onto the organic underlayer film by using the titanium-containing resist underlayer film having the transferred pattern as a mask; (7) removing an exposed area of the titanium-containing hard mask and the titanium-containing resist underlayer film by wet stripping method.