Fuji Photo Film Company, Limited

Shigeo Koizumi

Keisuke Shiba

Nobuyuki Kita

Masaki Okazaki

Kazuto Kunita

Sho Nakao

Kiyohiko Yamamuro

Yasubumi Murota

Yoshihide Hayakawa

Nobuo Nishikawa

A polymerizable lithographic printing plate precursor comprising a support having in order thereon, a polymerizable photosensitive layer and a protective layer containing (A) polyvinyl alcohol and (B) a polyoxyethylene castor oil ether surfactant.

Polymerizable lithographic printing plate precursor

A photosensitive image-recording material comprising a support having provided thereon a photosensitive layer and an oxygen-cutoff layer (protective layer).

Photosensitive image-recording material

A light-sensitive material comprises a light-sensitive layer containing a light-sensitive silver halide, a reducing agent and a polymerizable compound having an ethylenic unsaturated group which is provided on a support. The light-sensitive layer contains a polymer binder having an ethylenic unsaturated double bonding group in its side chain. The light-sensitive material is advantageously employable as a lithographic plate.

Light-sensitive material containing silver halide, reducing agent,

A presensitized plate from which a lithographic printing plate is to be prepared, comprising a support having provided thereon a non-silver light-sensitive layer comprising an O-quinonediazide compound and a silver halide light-sensitive layer in this order, said silver halide light-sensitive layer containing a specific sensitizing dye. The presensitized plate is specifically high in sensitivity to a light of the wavelength in the range of 480 nm to 520 nm, and therefore it can be handled even under the lighter safe light.

Presensitized plate for lithography

A light-sensitive composition which is developable with an aqueous alkaline solution, comprising (a) at least one light-sensitive resin obtained by adding an active mercaptocarboxylic acid to a part of carbon-carbon unsaturated bonds of a polymer having at least two photodimerizable unsaturated double bonds adjacent to an aromatic nucleus in the main chain thereof and (b) optionally at least one negative-working diazo resin. The light-sensitive composition makes it possible to prepare a light-sensitive plate capable of developing with an aqueous alkaline solution without forming insoluble substances in the developer during the development and the adhesive force between the substrate and the light-sensitive layer of the plate is increased, which in turn substantially improves the printing durability of the lithographic printing plate as a final product.

Light-sensitive composition

A process for producing a photosensitive lithographic plate comprises coating onto a substrate having a hydrophilic surface a solution of a negative working photosensitive composition containing a photosensitive diazo resin and a linear organic polymer dissolved in a solvent mixture comprising:

Process for producing photosensitive negative working diazo resin

A presensitized lithographic printing plate, which comprises a support having a hydrophilic surface. A non-silver light-sensitive layer capable of having formed therein a lipophilic image pattern and a direct positive light-sensitive silver halide emulsion layer are provided on the support in that sequence. The non-silver light-sensitive layer is provided with an adjacent hydrophilic colloid layer in which a resin is dispersed in fine particle form. The resin is a copolymer comprising (A) a recurring unit derived from at least one monomer of acrylic acid and methacrylic acid, and (B) a recurring unit derived from at least one monomer of an aralkyl acrylate and an aralkyl methacrylate.

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Shizuoka, Japan

Shigeo Koizumi