Konica-Minolta Holdings, Inc.

Konica Minolta Medical and Graphic, Inc.

Kazuyoshi Shioiri

Hiroaki Ando

Kazuhito Ihara

Shinichi Karakata

A water-based ink including a colored microparticle dispersion having water and a microparticle containing a resin and a colorant, wherein the microparticle has a core part and a shell part to form a core-shell structure and the core part and the shell part are cross-linked with a cross-linking agent.

Water-based ink containing colored microparticle dispersion

A photothermographic imaging material containing a support having thereon photosensitive silver halide grains, light-insensitive organic silver salt grains, a reducing agent for silver ions and polymer, wherein and average particle size of the photosensitive silver halide grains is 0.005 to 0.1 &#x3bc;m, and the polymer dissolves both in water and in an organic solvent.

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Kyoto, Japan

Kazuyoshi Shioiri