Process for developing positive photosensitive lithographic printing plate
US4452880A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1982 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | May 18, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/322
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing process suitable to treat a positive photosensitive lithographic printing plate comprising a photosensitive layer containing, as the photosensitive constituent, an o-quinonediazide compound provided on an aluminium plate. A positive photo-sensitive lithographic printing plate is exposed imagewise and then developed with a developing solution containing an aqueous solution of an alkali metal silicate in which the alkali metal is essentially constituted by potassium. With the method, development treatment can be conducted stably for a long period without generating insolubes in the developing solution even when an extremely large quantity of positive photosensitive lithographic plates are treated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.