Nippon Paint Compnay, Ltd.

Mitsubishi Rayon Company, Limited

Yasushi Umeda

Toshitaka Kawanami

Koichi Kimoto

Chitoshi Kawaguchi

Hisaichi Muramoto

Yasuyuki Takimoto

Norihisa Osaka

Shin Saito

Kunsei Tanabe

Masakatsu Nishimura

Hisao Satoh

It is an object of the present invention to provide a developer-circulating method and an apparatus for carrying out the method in making a flexographic printing plate which prevents dissolved chemical substance from adversely affecting human bodies and has excellent safety; capable of preventing the increase of the viscosity of developer; and capable of effectively preventing the dissolved chemical substance from adhering to the apparatus, thus preventing the life of the apparatus from being reduced and collecting the dissolved chemical substance in a short period of time and which is superior in operation efficiency, work efficiency, and treating efficiency. Solid content of liquid containing resin component which has eluted from flexographic printing plates 3, 42 and dispersed in developer is flocculated by flocculating agent, and the liquid containing the flocculated solid content is separated into the liquid and solid contents. The solid content is discharged and the liquid is re-utilized as the developer. A pH-adjustment may be performed in addition to the flocculation. The pH-adjustment may be carried out after the developer is separated into the solid content and the liquid, without performing the flocculating process.

Developer-circulating method in flexographic printing plate-making

Disclosed is a water developable photosensitive resin composition suitable for a printing plate, which has excellent dimensional stability and excellent chemical and physical properties. The photosensitive resin composition comprises;

Water developable photosensitive resin composition

Disclosed is a water-developable photosensitive resin composition capable of hot melt molding, which comprises:

Water developable photosensitive resin composition, and resin or

A photosensitive resin base printing material in the form of laminate comprising, in successive order, a support, a photosensitive resin layer, a slip layer of a high molecular substance which is soluble or swellable in a developer, an optional releasing layer and a sheet or film form of protective layer, which is characterized in that a dyestuff is included in an amount of 0.01 to 20% by weight of the high molecular weight substances in said slip layer. The present printing material is specifically excellent in resolution and far improved as compared with heretofore proposed printing materials in respect to both handling and visual inspection properties.

Photosensitive resin base material for making relief printing plates

The present invention provides a photosensitive resin plate for flexographic printing, comprising;

Photosensitive resin plate for flexography

Water-developable photosensitive resin composition and resin or printing

A method of production of photopolymer printing plates particularly characterized in the transfer procedure. In the method, an electrostatic latent image of original material is produced on a photoconductive medium, the image is developed by application of toner particles, and the toner image is transferred onto photopolymer printing plates having photosensitive resin layer or containing polymerizable monomer through linear pressure of line contact. The toner image thus transferred is then exposed to light without being fixed, plate portions defined by the toner image being subsequently removed together with the toner particles.

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Kusatsu, Japan

Yasushi Umeda