Patent ID: 6159655
Filing Date: 2000-12-12
Classification: G03F,Y10S

Abstract:
A positive photoresist composition for exposure to far ultraviolet light which comprises a resin decomposing by the action of an acid to increase its solubility in an alkali, and a compound generating an acid by irradiation with an actinic ray or radiation, said resin comprising a polymer that contains as repeating units both units represented by the following formula (I) and units represented by the following formula (II-A) or (II-B) and further has groups decomposing by the action of an acid: ##STR17## wherein R.sub.1 and R.sub.2 each independently represent a hydrogen atom, a cyano group, a hydroxyl group, --OOOH, --COOR.sub.5, --CO--NH--R.sub.6, --CO--NH--SO.sub.2 --R.sub.6, a substituted or unsubstituted alkyl, alkoxy or cyclic hydrocarbon group, or a group --Y; R.sub.5 represents a substituted or unsubstituted alkyl or cyclic hydrocarbon group, or a group --Y; the group --Y is represented by ##STR18## wherein R.sub.21 to R.sub.28 each independently represent a hydrogen atom or a substituted or unsubstituted alkyl group, and a and b are each 1 or 2; R.sub.6 represents a substituted or unsubstituted alkyl or cyclic hydrocarbon group; X represents an oxygen atom, a sulfur atom, --NH--, --NHSO.sub.2 --, or --NHSO.sub.2 NH--; R.sub.13 to R.sub.16 each independently represent a hydrogen atom, a halogen atom a cyano group, --COOH, an acid-decomposable group, --C(.dbd.O)--X--A--R.sub.17 or an unsubstituted or substituted alkyl or cyclic hydrocarbon group, or at least two of the substituents R.sub.13 to R.sub.16 combine with each other to form a ring; n is 0 or 1; R.sub.17 represents --COOH, --COOR.sub.5, --CN, a hydroxyl group, an unsubstituted or substituted alkoxy group, --CO--NH--R.sub.6, --CO--NH--SO.sub.2 --R.sub.6 or the group --Y; and A represents a single bond or a divalent linkage group.