Patent ID: 6808860
Filing Date: 2004-10-26
Classification: G03F,Y10S

Abstract:
A positive photoresist composition comprising:(A1) a resin which contains a repeating unit represented by the following general formula (I), a repeating unit represented by the following general formula (NII) and a re eating unit having a group represented by any of the following general formulae (I-1) to (I-4), and whose dissolving rate toward an alkaline developing solution is increased by the action of an acid, and (B) a compound which generates an acid upon irradiation with an actinic ray or a radiation, wherein in the formula (I), Rn1 to Rn4 each represents a hydrogen atom or an alkyl group which may have one or more substituents; and a is 0 or 1;in the formula (NII), Rn5 represents a hydrogen atom or a methyl group; A represents one group or a combination of two or more groups each selected from the group consisting of a single bond, an alkylene group, a cycloalkylene group, an ether group, a thioether group, a carbonyl group and an ester group; W represents a group represented by â€”C(Rna)(Rnb)(Rnc) or a group represented by â€”CH(Rnd)â€”Oâ€”Rne, wherein Rna, Rnb, and Rnc each represents a linear or branched alkyl group having 1 to 20 carbon atoms or an alicyclic hydrocarbon group which may have a halogen atom, an alkyl group, an alkoxy group, an alkoxycarbonyl group, an acyl group or an acyloxy group as a substituent, provided that Rna and Rnb may be bon ed to each other to form an alicyclic ring together with the carbon atom to which the groups are commonly attached and, in this case, Rnc is an alkyl group having 1 to 4 carbon atoms; Rnd represents a hydrogen atom or an alkyl group; Rne represents a linear or branched alkyl group having 1 to 20 carbon atoms or an alicyclic hydrocarbon group which may have a halogen atom, an alkyl group, an alkoxy group an alkoxycarbonyl group, an acyl group or an acyloxy group as a substituent; in the general formulae (I-1) to (I-4), R1 to R5 each independently represents a hydrogen atom, or an alkyl group, a cycloalkyl group or an alkenyl group which may have one or more substituents, and two of R1 to R5 may be bonded to each other to form a ring.