G - Physics – 03 – F
Patent
G - Physics
03
F
G03F 7/038 (2006.01) G03F 7/09 (2006.01) G03F 7/32 (2006.01)
Patent
CA 2056302
A method for preparing a lithographic printing plate comprises imagewise exposing 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: [ SiO2 ] / [ M2 O ] (wherein [ SiO2 ] means molar concentration (mol/l ) of SiO, and [ M2 O ] is molar concentration (mol/l) of oxide M2 O of an alkali metal (M)) ranging from 0.3 to 1.0 and an SiO2 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.
Kunichika Kenji
Toyama Tadao
Fuji Photo Film Co. Ltd.
Riches Mckenzie & Herbert Llp
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