Nippon Paint Compnay, Ltd.

Nippon Paint

Shin Saito

Yasuyuki Takimoto

Kunsei Tanabe

Yasusi Umeda

Masakatsu Nishimura

Seiji Arimatsu

Yasushi Umeda

Koichi Kimoto

Takahiro Tsunoda

Sadayoshi Kaneda

A photo-sensitive composition for dry formation of image comprising a dyestuff having a photo-fading property, a ketonic sensitizing agent and a high molecular polymer as a binding agent, which can provide a visible image by the irradiation of light and maintain the image without any fixing treatment.

Photo-sensitive composition for dry formation of image

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.

Electrophotographic method for producing photopolymer printing plate

The photosensitive composition contains a water-soluble graft copolymer of a partially hydrolyzed polyvinyl acetate grafted with acrylonitrile and optionally another vinylic monomer, a polymeric emulsion and a diazo compound. This composition possesses high resistance to solvent, abrasion and moisture and a favorable water-dissolubility as well.

Photosensitive diazo composition with graft copolymer for use in

Printing plate production apparatus wherein a latent image is formed at the surface of photoconductive insulating sheet, either by an optical system for effecting sheet exposure or by a laser emission scanning system which constitutes the terminal of a facsimile transmission system, this latent image is developed by toner particles, for example, which are applied on, but not fixed on the photoconductive sheet, the developed image is temporarily transferred onto a printing plate with which the photoconductive sheet is brought into pressure contact, and the printing plate carrying the developed image is exposed to light which may effect chemical changes in the printing plate to harden portion thereof unprotected by toner particles after which the printing plate receives treatment to remove toner particles and unhardened portions thereof. In the means of the invention a sheet carrying a developed image initially transmitted by a single facsimile transmission system may be employed as a master copy which is mounted in the exposure system and serves in production of a plurality of identical printing plates.

Printing plate production apparatus

Growing community of inventors

Suita, Japan

Shin Saito