Patent ID: 7166418

Claim:
A pattern formation method comprising the steps of: forming a resist film made of a resist material containing a base polymer including a polymer compound having a unit represented by a general formula of the following Chemical Formula 4; performing pattern exposure by selectively irradiating said resist film with exposing light of high energy beams of a wavelength not shorter than a 100 nm band and not longer than a 300 nm band or not shorter than a 1 nm band and not longer than a 30 nm band or electron beams; and forming a resist pattern by developing said resist film after the pattern exposure: wherein R 1 , R 2 and R 3 are the same or different and are a hydrogen atom, a fluorine atom, a straight-chain alkyl group, a branched or cyclic alkyl group or a fluoridated alkyl group with a carbon number not less than 1 and not more than 20; R 4 is a straight-chain alkylene group or a branched or cyclic alkylene group with a carbon number not less than 0 and not more than 20; and R 5 and R 6 are the same or different and are a hydrogen atom, a straight-chain alkyl group, a branched or cyclic alkyl group or a fluoridated alkyl group with a carbon number not less than 1 and not more than 20, or a protecting group released by an acid.