Method for obtaining a lithographic printing plate utilizing a diazo-base imaging element containing a dispersed water insoluble polymer
US5667939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1996 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Apr 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/021
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a method for obtaining a lithographic printing plate comprising the steps of (i) image-wise exposing an imaging element comprising on a hydrophilic surface of a support a light sensitive layer containing a diazo resin or a diazonium salt and a dispersed water-insoluble polymer with a melting point or glass transition temperature above 40.degree. C. and capable of coagulating when heated at or above its melting point or glass transition temperature, and (ii) subsequently removing the light sensitive layer in the non-exposed or insufficiently exposed areas of said imaging element by means of rinsing or washing said imaging element with plain water, characterized in that afterwards said developed image-wise exposed imaging element is heat-treated at a temperature at least equal to the glass transition temperature or melting point of said dispersed water-insoluble polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.