Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making printing plates
Patent
1991-11-22
1996-01-02
Dote, Janis L.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making printing plates
4302781, 430309, 430331, 1014631, 101467, G03F 730, G03F 732
Patent
active
054807620
ABSTRACT:
A method for preparing a lithographic printing plate comprises imagewise exporting a PS plate comprising an aluminum substrate having an anodized layer and a light-sensitive layer applied on one side of the substrate and then developing the PS plate with a developer comprising an aqueous solution of an alkali metal silicate, while compensating changes in the developer due to the development of the PS plate by supplementing, to the developer, a replenisher comprising an aqueous solution of an alkali metal silicate, wherein the PS plate is provided with a coating layer containing an organic polymeric compound on the back face and the replenisher is an aqueous solution of an alkali metal silicate having a ratio: [SiO.sub.2 ]/[M.sub.2 O] (wherein [SiO.sub.2 ] means molar concentration (mol/l) of SiO.sub.2 and [M.sub.2 O] is molar concentration (mol/l) of oxide M.sub.2 O of an alkali metal (M)) ranging from 0.3 to 1.0 and an SiO.sub.2 content ranging from 0.5 to 4.0% by weight. The method makes it possible to substantially reduce the amount of the developer to be replenished, does not cause any formation of insolubles even if a great deal of PS plates are processed over a long time period and thus stable developing treatment can be carried out.
REFERENCES:
patent: 4259434 (1981-03-01), Yamasue et al.
patent: 4550073 (1985-10-01), Neiss et al.
patent: 4689272 (1987-08-01), Siomon et al.
Patent & Trademark Office English Language Translation of Japanese Patent 2-40657 (Feb. 1990).
World Patent Index, Feb. 9, 1990 of JP-A-2-040-657.
Kunichika Kenji
Toyama Tadao
Dote Janis L.
Fuji Photo Film Co. , Ltd.
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