Toyo Ink Manufacturing Company

Toyo Ink Mfg. Co., Ltd.

Ippei Imagawa

Masahiro Fujii

Sunao Satake

Yoshimi Yatsuyanagi

Ataru Chiba

Takahiro Yuasa

A pigment composition obtainable by dry-milling an organic pigment in the presence of a resin for a printing ink, the resin being composed of a synthetic resin for a printing ink in an amount of 10 to 80 parts by weight per 100 parts by weight of the organic pigment and an aliphatic hydrocarbon resin which is extracted from gilsonite and has a softening point of 120 to 125&#xb0; C. in an amount of 0.1 to 5 parts by weight per 100 parts by weight of the organic pigment.

Pigment composition and printing ink containing the same

A reactive microgel suitable for a photosensitive resin composition for a water-developable flexographic printing plate, which has an average particle diameter to 10 .mu.m, and is formed of

Reactive microgel and photosensitive resin composition containing the

A reactive microgel suitable for a photosensitive resin composition for a water-developable flexographic printing plate, which has an average particle diameter of 1 to 10 .mu.m, and is formed of microgel particles, as a core, synthesized from an acrylic monomer in an aqueous medium in the presence of an oil-soluble initiator and in the presence of a reactive polymer emulsifier which is an adduct of a neutralized product of an acrylic copolymer having a tertiary amino group with a compound having an epoxy group and an .alpha.,.beta.-unsaturated double bond, and a nonionic emulsifier having an HLB of 12 to 16, and a compound having an epoxy group and an .alpha.,.beta.-unsaturated double bond, attached to surfaces of the microgel particles.

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Tokyo, Japan

Ippei Imagawa