Nippon Paint Compnay, Ltd.

Yutaka Kanoi

Kazunori Kanda

Hisaichi Muramoto

The present invention provides an indirect type lithographic printing original plate which can afford a high-quality print without causing scumming in the background area. The indirect type lithographic printing original plate includes a substrate and a zinc oxide-dispersed resin layer formed on the surface of the substrate, the substrate being a plastic film or sheet containing 1 to 40% by weight of a polymer antistatic agent having a melting point of not less than 90.degree. C., and wherein the polymer antistatic agent is substantially insoluble in water and isopropyl alcohol.

Indirect type lithographic printing original plate

Disclosed is a photosensitive material for printing comprising a photoconductive layer containing a phthalocyanine compound and a binder resin provided on a conductive substrate. The binder resin is composed of one or more sorts of resins. At least one sort of the resin is a homopolymer of a radical-polymerizable monomer (I) of the formula: ##STR1## wherein R.sup.1 is hydrogen or a methyl group, m is an integer of 2 to 5 and n is an integer of 0 to 10. An amount of the homopolymer is 0.01 to 50% by weight based on the total amount of the binder resin.

Photosensitive printing material

The present invention provides an electrographic printing photosensitive resin composition, which exhibits a good photosensitivity in a negative corona charging system and is useful for a laser platemaking system using semi-conductor laser light within a near infrared range as a light source. Disclosed is a negative charging type printing photosensitive resin composition comprising a phthalocyanine compound (a), a mercaptoarylimidazole (thiazole) compound (b) and, if necessary, a compound selected from the group consisting of a condensed polycyclic quinone compound, a bisazo compound, a cyanine compound, a quinacridone compound and a mixture thereof (d), said compounds being dispersed in a binder resin (c). A printing photosensitive resin plate using the photosensitive resin composition is also disclosed.

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Suita, Japan

Yutaka Kanoi