Patent ID: 7592131

Claim:
A method for producing a fine hollow structured member on a substrate comprising: a step of forming a positive-working photosensitive material layer on a substrate; a step of heating said positive-working photosensitive material layer thereby crosslinking said positive-working photosensitive material layer; a step of executing an irradiation with an ionizing radiation of a first wavelength region capable of decomposing said crosslinked positive-working photosensitive material layer on a predetermined area of said crosslinked positive-working photosensitive material layer; and a step of removing, by a development, the area irradiated by the ionizing radiation of said crosslinked positive-working photosensitive material layer from the substrate, thereby obtaining a mold pattern formed by a non-irradiated area by the ionizing radiation of said crosslinked positive-working photosensitive material layer; a step of forming a covering resin layer, formed by a negative-working photosensitive material sensitive to a second wavelength region, in a position covering at least a part of the mold pattern on said substrate; a step of irradiating said covering resin layer with an ionizing radiation of the second wavelength region thereby hardening said covering resin layer; and a step of removing, by dissolution, the mold pattern covered by said hardened covering resin layer from the substrate thereby obtaining a hollow structure corresponding to said mold pattern; wherein said positive-working photosensitive material layer includes a ternary copolymer containing methyl methacrylate as a main component, methacrylic acid as a thermally crosslinkable factor and a factor for expanding a sensitivity region for said ionizing radiation; and said first wavelength region and said second wavelength region do not overlap mutually.