Fuji Photo Film Company, Limited

Tsumoru Hirano

Morio Yagihara

Keiji Mihayashi

Kei Sakanoue

Toshifumi Inno

Makoto Umemoto

Osamu Takahashi

Koji Sonokawa

Takashi Ozawa

Taku Nakamura

Hiroaki Yokoya

Nobuo Sakai

Takeshi Shibata

Mitsunori Hirano

Tatsuji Higashi

Yukio Abe

Eiji Funatsu

Hiroshi Takahashi

Toshiaki Aono

Nobuo Furutachi

Junichi Yamanouchi

Minoru Sakai

Yoshio Ishii

Yukio Maekawa

Syunichi Kondo

Toshiyuki Watanabe

Norio Aoshima

Shigetoshi Ono

Genichi Furusawa

Kokichi Waki

Shunichi Ishikawa

Seiki Sakanoue

Mitsumasa Tsuchiya

Yoshihiko Urabe

Toshihiko Hiruma

Tatsuya Yamamoto

Haruyoshi Gotou

Kiyoshi Nakajyo

Takahiro Matsushita

An object of the present invention is to provide a method for manufacturing such a dry lithographic printing master plate that has eliminated uneven plate performance and more specifically that provides a stable adhesiveness between a heat-sensitive layer and a silicone rubber layer as well as a high aging stability of a coating solution. Provided is a method for preparing a master plate useful for making a dry lithographic printing plate comprising at least a heat-sensitive layer and a silicone rubber layer which are stacked in this order on a substrate, said method comprising the steps of: (1) dissolving a diorgano-polysiloxane and a curing catalyst in a solvent; (2) dissolving a cross-linking agent in a solvent; (3) mixing the solution obtained in the step (1) with the solution obtained in the step (2); and (4) applying the mixture obtained in the step (3) over the heat-sensitive layer to thereby form the silicone rubber layer.

Method for preparing master plate useful for making lithographic printing plate without need of dampening water

A method for making a lithographic printing plate comprises the steps of imagewise exposing, to a laser beam, a PS plate comprising a substrate, a heat-sensitive layer containing at least one light-heat conversion agent and a binder polymer formed on the substrate and a hydrophilic or lipophobic layer applied onto the heat-sensitive layer; and then removing the hydrophilic or lipophobic layer on the laser-exposed area by developing the imagewise exposed printing plate within 120 seconds from the completion of the laser-exposure to thus give a lithographic printing plate, wherein the developing treatment comprises the step of rubbing the exposed printing plate surface with an abrasion means in the absence of any liquid. This method permits the production of a lithographic printing plate without causing any deterioration of the developing properties of the PS plate even when the imagewise exposed PS plate is developed within a short period of time after the completion of the laser-exposure.

Method for making lithographic printing plate

A waterless planographic printing plate precursor which has a support member, a light-to-heat conversion layer for converting laser light to heat, and a silicone rubber layer. The light-to-heat conversion layer is contains at least one kind of polyurethane having at least one carboxyl group, and at least one light-to-heat conversion substance.

Waterless planographic printing plate precursor and production method thereof

A waterless planographic printing plate precursor on which laser writing is possible, which has excellent scratch resistance and solvent resistance, and which also has excellent image reproducibility. The waterless planographic printing plate precursor includes a substrate on which are superposed in the following order a light-to-heat conversion layer containing a compound for converting laser light to heat, and a silicone rubber layer, wherein the light-to-heat conversion layer contains a reaction product of a metallic chelate compound such as titanium diisopropoxide bis (2,4-pentadionate) and/or a self-condensation product of a metallic chelate compound.

A planographic original plate requiring no fountain solution, in which a layer allowing adhesion thereof with a silicone rubber layer to decrease through transforming a laser beam into heat and the silicone rubber layer of an addition type containing 10 to 20% by weight of organohydrogenpolysiloxane based on solid content are laminated to a support in this order, thereby providing a planographic original plate requiring no fountain solution which is capable of heat mode recording due to a laser beam and is excellent in image reproducibility and resistance to scratching.

Planographic original plate requiring no fountain solution

A lithographic printing plate precursor requiring no fountain solution possible to conduct heat mode recording by a laser beam and excellent in image reproducibility and scratch resistance, which comprises a support having provided thereon a light-heat conversion layer containing a compound converting a laser beam to heat and a silicone rubber layer in this order, wherein the light-heat conversion layer contains an addition polymer having a group capable of reacting with a silicone crosslinking agent at a side chain thereof, and the addition polymer reacts with a silicone crosslinking agent contained in the silicone rubber layer when the silicone rubber layer is formed by coating and drying.

Lithographic printing plate precursor requiring no fountain solution

The present invention relates to a method of making a waterless lithographic printing plate having an image by which printing can be effected without using dampening water, comprising the steps of (1) providing a waterless lithographic fresh printing plate by layering on a substrate a first layer which converts laser light to heat and a second layer which has an ink-repellent surface, sequentially, (2) exposing the waterless lithographic fresh printing plate laser light by irradiating laser light which can be absorbed by the first layer, and (3) applying a liquid having a surface tension of 25-50 dyn/cm.sup.2 to the second layer, and abrading the surface of the second layer to remove the exposed portion of the second layer selectively so that an image enabling printing without using dampening water can be formed.

Method of making a waterless lithographic printing plate

A support is laminated with a light-sensitive layer and a silicone rubber layer in this order, wherein the light sensitive layer comprises (a) a resol resin, (b) a novolak resin, (c) an infrared absorber, and (d) a compound which generates an acid with heat, thereby providing a light-sensitive lithographic printing plate requiring no fountain solution for direct print-making, which can directly record digital date of computers, etc. with solid lasers or semiconductor lasers having light emitting regions from near infrared to infrared.

Light-sensitive lithographic printing plate requiring no fountain

A method for forming a lithographic printing plate requiring no fountain solution, which comprises the steps of irradiating a lithographic printing plate precursor requiring no fountain solution comprising a support having a layer for converting a laser beam to heat (first layer) and a layer having an ink-repellent surface (second layer) provided thereon in this order with the laser beam absorbable by the first layer to conduct image exposure, pressing an adhesive sheet layer on the second layer, the sheet having a surface layer adhesive to a surface of the second layer, and thereafter separating the adhesive sheet, thereby forming an image which makes it possible to perform printing requiring no fountain solution.

Formation of lithographic printing plate requiring no fountain solution

A presensitized plate for use in making a lithographic printing plate requiring no fountain solution excellent in scratch resistance and press life is disclosed, which comprises support and, formed thereon in order from support, a photosensitive layer and a silicone rubber layer, wherein the silicone rubber layer is a crosslinked and cured product obtained by addition reaction of (a) polysiloxane having alkenyl groups with (b) hydrogen polysiloxane having .tbd.Si--H groups so that the number of .tbd.Si--H groups in (b) is from 11 to 30 based on the number of alkenyl groups in (a), wherein polysiloxane (a) has at least two alkenyl groups directly bonded to silicon atoms per molecule, average repeating number x of --[Si(R.sup.1)(R.sup.2)--O].sub.x -- group of 100 .ltoreq.x.ltoreq.600 (wherein R.sup.1 and R.sup.2 each represents a alkyl group, aryl group, aralkyl group, alkenyl group, polydimethylsiloxane group or halogenated hydrocarbon group, provided that 70% or more of R.sup.1 and R.sup.2 are methyl groups), and alkyl groups or alkenyl groups directly bonded to the terminal silicon atoms, and wherein the hydrogen polysiloxane (b) is formula (I):

Photosensitive lithographic printing plate requiring no fountain solution

A photosensitive lithographic printing plate requiring no fountain solution, which comprises an aluminum base and, formed thereon in the following order, a primer layer, a photosensitive layer, and a silicone rubber layer, wherein the aluminum base has a roughened surface with an average roughness (R.sub.a) of from 0.2 .mu.m to 0.8 .mu.m and a whiteness of from 0.10 to 0.35, and the primer layer is a homogeneous layer comprising a binder as the main component. The lithographic printing plate requiring no fountain solution is excellent in tone reproducibility, suitability for plate inspection, suitability for plate scanner examination, and press life.

A photopolymerizable composition comprising: (a) a compound obtained by reacting one mole of a polyamine represented by the following general formula (I) with at least 2 moles of a compound having a group capable of reacting with the polyamine and a polymerizable ethylenically unsaturated group: ##STR1## wherein n is an integer of not less than 1 and (b) a photopolymerization initiator. A dry PS plate comprises a substrate provided thereon with, in order, a light-sensitive resin layer and a silicone rubber layer wherein the light-sensitive resin layer comprises the photopolymerizable composition and a polymeric compound having film-forming ability. The photopolymerizable composition and the dry PS plate have very high sensitivity.

Photopolymerizable composition and dry PS plate

A water-less PS plate for use in making a water-less lithographic printing plate comprises, on a substrate, a photopolymerizable light-sensitive layer and a silicone rubber layer in this order, wherein the light-sensitive layer is formed from a photopolymerizable light-sensitive composition which contains an urea bond-containing polyurethane as a binder. According to the present invention, there is obtained a water-less PS plate having good resistance to scratch and high printing durability. Moreover, the resulting light-sensitive layer does not get sticky, the light-sensitive layer of the non-image portions is not peeled off during the printing operations, and the lithographic plate shows good dyeability and plate-examination property.

PS plates requiring no dampening water

A silver halide color photographic material comprising a support having provided thereon at least one water-soluble yellow dye-forming polymer coupler containing a repeating unit derived from at least one monomer in which the polymerization moiety is only in a coupling-off group.

Silver halide color photographic material

A method for forming an image comprising heating, in the presence of water and at least one of a base and a base precursor, a combination of (i) a light-sensitive element comprising a support provided thereon at least a light-sensitive silver halide, a binder, and a dye providing substance and (ii) a dye fixing element comprising a mordant capable of fixing a mobile dye formed in said light-sensitive element, wherein said dye fixing element further contains at least one of oil droplets and a latex comprising a polymer having a glass transition point of 40.degree. C. or less.

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Shizuoka, Japan

Tsumoru Hirano