Toray Industries, Inc.

Takao Kinashi

Norio Kawabe

Shigetora Kashio

Mitsuru Suezawa

Junichi Fujikawa

Masaya Asano

Takashi Fujita

Yasuko Yokoyama

The present invention relates to a photosensitive relief or intaglio printing plate comprising a base and a photocurable photosensitive layer formed on the base, the photocurable photosensitive layer containing a dye precursor which forms a dye upon irradiation of actinic light. A relief (convex) pattern or a concave pattern can be recognized by coloring, thereby facilitating the printing plate inspecting work. The developing solution used is not colored or contaminated.

Photosensitive relief printing plate and photosensitive intaglio

A dry planographic plate has an image area and a non-image area in the shape of an image. The non-image area is constituted by a silicone rubber layer. The surface of the plate is coated with a thin film containing an organic polymer.

Dry planographic plate with silicon rubber layer and organic polymer

Provided is a presensitized planographic printing master plate requiring no dampening water for use in negative work which comprises a base substrate, a light releasing photosensitive layer overlying the base substrate and a silicone rubber layer overlying the photosensitive layer. When the printing master plate is exposed through a negative film and then treated with a developer, only the silicone rubber layer overlying the exposed photosensitive layer is removed, while the photosensitive layer remains as it is to form an image area. Dampening water is not required when printing is carried out.

Dry planographic printing plate and preparation thereof

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Otsu, Japan

Takao Kinashi