Fuji Photo Film Company, Limited

Fujifilm Corporation

Keiji Akiyama

Tadao Toyama

Koichi Kawamura

Hidekazu Oohashi

Nobuyuki Kita

Shiro Tan

Kazuo Maemoto

Toshifumi Inno

Hisashi Hotta

Noriaki Watanabe

Hiroshi Misu

Kiyotaka Fukino

Satoshi Takita

Akinobu Koike

Seiji Uno

Mitsuhiro Imaizumi

Satoshi Hoshi

Hiromichi Tachikawa

Ikuo Kawauchi

Katsuji Kitatani

Akira Nagashima

Yoshio Okishi

Hiromitsu Yanaka

Akira Nishioka

Takeshi Serikawa

Shunsaku Higashi

Toru Yamazaki

Nobuyuki Nishimiya

Yoshitaka Kawamura

Masakazu Osada

Masanori Imai, Deceased

Toshimi Hirano

Kazuo Maetomo

Kazuo Fujita

A metal regeneration method including: a melting furnace cleaning step of melting pure aluminum with an aluminum content of 99.5% by weight or higher in a melting furnace to clean the inside of the melting furnace; and a metal regeneration step of melting waste lithographic printing plates selected from unused lithographic printing plates and used lithographic printing plates, in the melting furnace whose inside has been cleaned by the melting furnace cleaning step, to obtain regenerated metal.

Method of regenerating metal, regenerated metal, material for lithographic printing plate bases, and lithographic printing plate

A lithographic printing plate precursor comprising a hydrophilic support and an image-forming layer containing a heat radical-generating agent, a polymethine dye, and at least one component selected from fine particles containing a compound having a radical polymerizable group and microcapsules encapsulating a compound having a radical polymerizable group.

Lithographic printing plate precursor

A heat-sensitive lithographic printing plate precursor comprising a substrate having ink-receptive surface or coated with an ink-receptive layer having provided thereon a hydrophilic layer which comprises:

Heat-sensitive lithographic printing plate precursor

A lithographic printing plate precursor which comprises a support having provided thereon a layer comprising a hydrophilic medium, wherein the layer comprising a hydrophilic medium contains a hydrophobitization precursor having a hydrophilic surface and a light/heat converting agent which is hydrophilic in itself, or at least on the surface.

Lithographic printing plate precursor, method for producing the same, and method of lithographic printing

A heat-sensitive lithographic printing plate precursor which comprises a substrate having thereon an anodic oxidation layer, with the printing plate precursor comprising a hydrophilic layer containing at least one kind of fine particles selected from the group consisting of heat-fusible hydrophobic thermoplastic fine particles, finely divided polymers having thermally reactive functional groups and microcapsules in which compounds having heat-reactive functional groups are encapsulated, and with the anodic oxidation layer having a surface over which micropores having an average pore size of 6 to 40 nm are uniformly distributed.

A hydrophilic layer and an overcoat layer are provided in this order on a heat-sensitive layer having an ink receiving surface, so as to form an original (plate) for a lithographic printing plate. The overcoat layer can be removed during printing. A system capable of forming an inorganic hydrophilic matrix by sol-gel conversion is provided in the hydrophilic layer. Adhesion between the heat-sensitive layer and the hydrophilic layer decreases in a heated region through image processing. Emulsion ink is supplied to the plate surface during printing, whereby the overcoat layer and the hydrophilic layer at an image portion are removed with a hydrophilic component of the emulsion ink. Thus, with a heat-sensitive original that can be subjected to heat-mode prepress using laser exposure, good printed matter can be stably obtained, irrespective of balance between image and non-image portions, without using wetting water.

Lithographic printing process

A heat mode type lithographic printing plate precursor which can be directly mounted on a printing press without development processing after scanning exposure for a short time to conduct plate-making, has excellent press life and also gives few print stains onto a printed face, which comprises a substrate having provided thereon an image recording layer containing fine light-heat convertible particles which are coated with a hydrophilic material, the layer being made hydrophobic by the action of heat.

A photosensitive resin composition containing a high molecular compound having at least a) a fluoro aliphatic group, and b) a group represented by formula &mdash;L&mdash;P (wherein L represents a divalent organic group connected to the skeleton of the high molecular compound, and P represents an aromatic group having a carboxyl group at the ortho-position).

Photosensitive resin composition

A heat-sensitive precursor of lithographic printing plates, which comprises a hydrophilic layer provided on a substrate having an ink-receptive surface or coated with an ink-receptive layer; the printing plate precursor further having a water-soluble overcoat layer on the hydrophilic layer, and the hydrophilic layer being a three-dimensionally cross-linked hydrophilic layer, the heated area of that is easily removed by a fountain solution or ink when subjected to printing operations.

A photosensitive lithographic printing plate in which press life, deletion performance, photosensitive layer removability and image reproducibility are compatible with one another, while retaining scumming prevention performance, which comprises an aluminum support hydrophilized after anodic oxidization, an intermediate layer provided thereon containing an alkali-soluble polymer adjusted in a number-average molecular weight (Mn) to the range of 300 to 5,000 by using an initiator in combination with a chain transfer agent in radical polymerization, and a photosensitive layer provided on the intermediate layer.

Photosensitive lithographic printing plate

A positive working photosensitive lithographic printing plate comprising an aluminum substrate and a positive working photosensitive layer, the aluminum substrate having been anodized and rendered water-wettable, wherein an intermediate layer containing a polymer comprising (A) a unit interacting with an alumina layer and (B) a unit interacting with a water-wettable layer is provided between the aluminum substrate and the photosensitive layer. The photosensitive layer and the water-wettable aluminum substrate have good adhesion so that the printing plate has a satisfactory press life.

Positive working photosensitive lithographic printing plate

Disclosed are (i) a positive-working photosensitive composition containing (a) a polymer having at least 60 mol % structural units represented by formula (1): ##STR1## wherein A represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 4 carbon atoms; X represents --CO-- or --SO.sub.2 --; Y represents --CO--R.sub.1 or --SO.sub.2 --R.sub.1, where R.sub.1 represents an alkyl group, a substituted alkyl group wherein the substituent on the substituted alkyl group is a halogen atom, an aryl group, an amido group, an alkoxy group or an alkoxycarbonyl group, an unsubstituted aromatic group, or a substituted aromatic group wherein the substituent on the substituted aromatic group is a halogen atom, an alkyl group, an alkoxy group having 1 to 10 carbon atoms, an amido group or an aryl group, provided that at least one of X and Y contains --SO.sub.2 --and (b) a o-naphthoquinone diazide, and (ii) a process for image formation which comprises image-wise exposing to light a photosensitive material having a photosensitive layer comprising the positive-working photosensitive composition and then developing the resulting photosensitive material with an aqueous alkali solution having a pH of 12.5 or below.

Positive-working photosensitive composition and process for image

A photosensitive lithographic printing plate which provides a wide range of proper conditions for development, high impression capacity, a flexible film sufficient in adhesion to a support and excellent processing suitability with a weakly alkaline developer (pH 12.5 or less) is disclosed. The photosensitive lithographic printing plate comprises a support and a photosensitive layer provided thereon, wherein the photosensitive layer is formed from a photosensitive composition containing at least a two-equivalent coupler residue-containing compound and a photosensitive compound or a photosensitive mixture acting as a positive type.

Photosensitive lithographic printing plate containing a two-equivalent

A PS plate comprises an aluminum substrate having anodized layers on both sides, a photosensitive layer on one side of the substrate and a coating layer of a metal oxide obtained by hydrolyzing and polycondensing an organic or inorganic metal compound on the side of the substrate opposite to that carrying the photosensitive layer. The PS plate is processed by a method comprising the steps of imagewise exposing it to light and then developing the imagewise exposed plate with an alkali aqueous solution containing an alkali metal silicate and having a pH of not less than 12. The PS plate and the method for processing the same permit substantial reduction of the amount of a replenisher for development to be supplemented and ensure a stable processing of the plate over a long time period without accompanying formation of insolubles in a developer. The PS plates never cause adhesion and peeling off of the photosensitive layers even when they are put in stacks. Moreover, the PS plate does not suffer from a problem of contamination of the back face due to adhesion of lipophilic substances such as a developing ink.

PS plate and method for processing same

A PS plate comprises an aluminum plate which is surface-roughened and then anodized so that the amount of an anodized layer formed is not less than 1.0 g/m.sup.2 ; a hydrophilic layer which is applied onto the anodized layer and which comprises at least one compound selected from the group consisting of:

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Shizuoka, Japan

Keiji Akiyama