Patent ID: 6200725
Filing Date: 2001-03-13
Classification: G03F

Abstract:
An alkali-developable, chemically amplified resist composition for forming resist patterns which comprises:I. an alkali insoluble compound which is a polymer or copolymer comprising a structural unit as a repeating unit, said structural unit containing a protected alkali-soluble group in which unit a protective moiety of said protected alkali-soluble group is cleaved upon action of an acid generated from a photo acid generator used in combination with said compound, thereby releasing said protective moiety from the alkali-soluble group and converting said compound to an alkali-soluble one, said alkali-soluble group being protected with an alicyclic hydrocarbon group-containing moiety represented by the following formula (II'): ##STR116##in whichR.sub.1 ' is a methyl, ethyl, propyl or isopropyl group which may be substituted or unsubstituted, andZ represents atoms necessary to complete an alicyclic hydrocarbon group along with a carbon atom to which said --CH.sub.2 --R.sub.1 ' is bonded; andII. a photoacid generator capable of being decomposed upon exposure to a patterning radiation to thereby produce an acid capable of causing cleavage of said protective moiety.