Process for the preparation of planographic printing forms
US4265999A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1979 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Dec 17, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/022
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for the preparation of planographic printing forms is described, in which a light-sensitive material composed of a support having a hydrophilic surface and of a light-sensitive layer, which contains a 1,2-naphthoquinone-diazide, is exposed imagewise, developed and then heated to a temperature above 180.degree. C. for such a time and at such a temperature level that an oleophilic precipitate is formed on the hydrophilic image background, and the precipitate is then removed by treatment, for example wiping over, with an aqueous solution of about 0.01 to 50% by weight of polyvinyl phosphonic acid. The treatment has the advantage that in this case the support surface, for example anodically produced aluminum oxide, is not significantly attacked and is nevertheless completely freed from impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.