Title:
PRODUCTION OF LITHOGRAPHIC PRINTING PLATE
Document Type and Number:
Japanese Patent JP3736943
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the suitability of an emulsion layer to washing-off at the time of washing and to improve ink receptivity and water retentivity by incorporating a metallic ion chelating agent into a washing liq.
SOLUTION: A lithographic printing plate material with physical developing nuclei between the Al substrate and a silver halide emulsion layer is exposed and subjected to at least development and washing with a washing liq. contg. a metallic ion chelating agent. An aminopolycarboxylic acid, polyphosphoric acid, a monophosphono(mono-, di- or tri)carboxylic acid or a compd. having two or more phosphonic acid groups is preferably used as the chelating agent. The pH of the washing lig. is about 4-9, preferably ≤8, especially preferably ≤8. The washing liq. may further contain a buffer imparting pH 4-7, preferably pH 5-7, e.g. a phosphate buffer, a citrate buffer or a mixture of them.
Inventors:
Toshiro Kondo
Application Number:
JP19401297A
Publication Date:
January 18, 2006
Filing Date:
July 18, 1997
Export Citation:
Assignee:
Mitsubishi Paper Mills Co., Ltd.
International Classes:
B41C1/10; G03F7/32; G03F7/00; G03F7/07; (IPC1-7): G03F7/32; B41C1/10; G03F7/00; G03F7/07
Domestic Patent References:
| JP9050128A | ||||
| JP58162393A | ||||
| JP5216236A | ||||
| JP7287399A | ||||
| JP5313373A | ||||
| JP49037703A |
Foreign References:
| EP0483415A1 |