Patent ID: 6887647

Claim:
A negative-working resist composition for electron beams or X-rays comprising (A) a compound generating a sulfomc acid by the irradiation of electron beams or x-rays, (B) a resin which is insoluble in water and soluble in an alkali aqueous solution, (C) a crosslinking agent containing at least three benzene rings and crosslinking with the resin (B) by the action of an acid, and (D) a compound generating, by the irradiation of electron beams or x-rays, a carboxylic acid represented by the following formula (a): R a â€”COOHâ€ƒâ€ƒ(a) wherein R a represents an alkyl group having 1 to 4 carbon atoms or a perfluoroalkyl group having 1 to 8 carbon atoms, wherein the resin (B) is a resin having a repeating unit represented by the following formula (b): wherein R 1 represents a hydrogen atom, a halogen atom, a cyano group, or an alkyl or haloalkyl group which may have a substituent; R 2 represents a hydrogen atom, or an alkyl, cycloalkyl, aryl, aralkyl or acyl group which may have a substituent; R 3 and R 4 , which may be the same or different, each represents a hydrogen atom, a halogen atom, a cyano group, or an alkyl, cycloalkyl, alkenyl, aralkyl or aryl group which may have a substituent; A represents a single bond, an alkylene, alkenylene, cycloalkylene or arylene group which may have a substituent, â€”Oâ€”, â€”SO 2 â€”, â€”Oâ€”COâ€”R 5 , â€”COâ€”Oâ€”R 6 â€”, or â€”COâ€”N(R 7 )â€”R 8 â€”; R 5 , R 6 and R 8 , which may be the same or different, each represents a single bond, an alkylene, alkenylene, cycloalkylene or arylene group, which may have a substituent, or a divalent group formed by combining the above-described alkylene, alkenylene, cycloalkylene or arylene group and at least one member selected from an ether structure, an ester structure, an amino structure, a urethane structure and a ureido structure; R 7 represents a hydrogen atom, or an alkyl, cycloalkyl, aralkyl or aryl group which may have a substituent; and n renresents an integer of 1 to 3; or plural R 2 's, or R 2 and R 3 or R 4 may combine with each other to form a ring.