Fuji Photo Film Company, Limited

Eiichi Mizuki

Kikuo Kubotera

Tadahiro Fujiwara

Masato Satomura

Haruhiko Iwano

Hideo Kawano

Fumiaki Shinozaki

Tomoaki Ikeda

Makoto Nagao

Shinpei Ikenoue

Satoru Honjo

Yoshito Mukaida

Masayoshi Tsuboi

Akio Ishizuka

Takuji Kaneda

A lithographic type diffusion transfer developing composition which provides high contrast images having sharp toe-gradation for developing silver halide light-sensitive materials contains at least one amine represented by one of the following general formulae (I), (II) or (III):

Lithographic type diffusion transfer developing composition

A printing plate having an improved durability which has a support having an oleophilic surface and a hydrophilic diffusion transfer image-receiving layer containing nucleus substance for the physical development and having between the oleophilic and hydrophilic layers at least one of gelatin or nitrocellulose.

Printing plate material

Developer compositions for diffusion transfer photographic materials containing amino compounds and imidazole compounds are used in a diffusion transfer photographic process for obtaining litho-type positive images of high contrast and of good short toe effect, the amino compounds being represented by the following formula I and the imidazole compounds by the following formula II:

Developer compositions for high contrast diffusion transfer photographic

A method of stabilizing a silver halide photographic material containing an image formed therein, said material comprising a silver halide emulsion on a support and having at least one member selected from the group consisting of iodine and an iodine containing inorganic compound in said silver halide emulsion or in an adjacent layer to said silver halide emulsion, comprising heating said photographic material.

Method for stabilizing silver halide photographic material

A photosensitive printing plate having excellent reproducibility of an original of continuous tone comprising a support having an oleophilic surface and formed thereon a diffusion transfer hydrophilic image-receiving layer containing nucleating materials for physical development and a photosensitive silver halide emulsion layer, said image-receiving layer containing an alginate or an image-receiving subsidiary layer containing an alginate present between said image-receiving layer and said photosensitive emulsion layer.

Photosensitive printing plate

A diffusion transfer image-receptive sheet comprising (a) a sheet of an alkali impermeable polymer having a surface portion converted into an alkali permeable state and (b) diffusion transfer nuclei incorporated in the alkali permeable surface portion.

Diffusion transfer image receptive materials

A printing plate having halftones and lines is produced by exposing a photosensitive printing plate material comprising a support having an oleophilic surface, a hydrophilic layer formed thereon and a layer of a direct positive-type photosensitive silver halide emulsion formed on top of the hydrophilic layer through a positive original, developing the exposed material to form a silver image in the emulsion layer, subjecting the developed material to an etch bleaching treatment to remove the hydrophilic layer at portions corresponding to the silver image and to reveal the oleophilic surface, and removing the emulsion layer at a portion on which the silver image is not formed, thereby to reveal said hydrophilic layer. The printing plate can given a number of good quality impressions from the outset of printing, and smeared impressions do not result during continued printing operation.

Process for producing printing plates

A thermodevelopable photographic material comprising a support and a layer composed of (a) a high silver ion conducting substance having an ion conductivity at 25.degree.C of at least 1 .times. 10.sup.-.sup.3 (.OMEGA.cm).sup.-.sup.1, such as silver iodide tungstate, or a mixture of the high silver ion conducting substance with silver, and (b) a weak reducing agent. In order to increase the sensitivity of the material, a photosensitive silver halide can further be incorporated in the layer. The photographic material is exposed imagewise, and then heated for a short time to form a permanent visible image of clear contrast.

Growing community of inventors

Asaka, Japan

Eiichi Mizuki