Fuji Photo Film Company, Limited

Fujifilm Corporation

Seiji Uno

Shiro Tan

Keiji Akiyama

Mitsuhiro Imaizumi

Sumiaki Yamasaki

Koji Sonokawa

Akihiro Endo

Satoshi Takita

A lithographic printing plate precursor is provided and has a porous aluminum support, (1) a layer containing a water-soluble polymer resin having a hydrophilic substituent adsorbable to a surface of the porous aluminum support and a sulfonic acid, and (2) an image recording layer from which unexposed areas can be removed by supplying an oil-based ink and an aqueous component thereonto on a printing machine without being subjected to development after exposure. The layer containing the water-soluble polymer resin, which has come in contact with the oil-based ink and the aqueous component, has a sulfonic acid group left therein.

Lithographic printing plate precursor and method of producing printing plate

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

A photosensitive lithographic printing plate requiring no fountain solution is described, which comprises a support having provided thereon a photopolymerizable photosensitive layer and a silicone rubber layer in this order, wherein the photopolymerizable photosensitive layer contains at least one photopolymerizable monomer represented by the following formula (I) and a photopolymerization initiator: ##STR1## The monomer represented by formula (I) is described in detail in the specification. Furthermore, a process for producing a photosensitive lithographic printing plate requiring no fountain solution is also described, which comprises the steps of soaking the above-described photosensitive lithographic printing plate requiring no fountain solution in water or an organic solvent mainly comprising water, and removing the silicon rubber layer to form an image while soaking the plate.

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Shizuoka, Japan

Seiji Uno