Water-developable film-forming diazonium compound containing photopolymerizable compositions and negative-working lithographic plates prepared therefrom
US4299905A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1980 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | Mar 26, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/0217
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film-forming oleophilic photopolymerizable composition is formed from a fluid epoxy resin having an epoxy equivalent of less than 350 and a photosensitive reaction product of a water-soluble, photosensitive condensation product of a diazonium compound and an organic condensation agent with an organic coupling agent. The organic coupling agent is selected such that the photosensitive reaction product is soluble in organic solvents but only slightly soluble in water. The photopolymerizable compositions can be used as the photosensitive layer of water-developable negative lithographic plates, such as printing plates. Water-developable negative lighographic plates are also provided in which the photosensitive layer is formed from a layer of the film-forming oleophilic photopolymerizable composition which is deposited on a hydrophilic support from an organic solvent solution. In addition to being water-developable the negative lithographic printing plates of the present invention have high mechanical resistance, long shelf-life and can be used in large production runs to make a great number of copies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.