Imaging element and method for making lithographic printing plates according to the silver salt diffusion transfer process
US5496679A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1995 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Mar 22, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides an imaging element comprising on a flexible hydrophobic support (i) a hardened hydrophilic layer, containing a hydrophilic synthetic homocopolymer or copolymer and being hardened with a hydrolyzed tetraalkyl orthosilicate crosslinking agent, (ii) a receiving layer containing physical development nuclei contiguous to said hydrophilic layer, (iii) an intermediate layer comprising a non-proteinic hydrophilic film-forming polymer or hydrophobic polymer beads having an average diameter not lower than 0.2 .mu.m and having been prepared by polymerization of a ethylenically unsaturated monomer and (iv) a photosensitive layer containing a silver halide emulsion being in water permeable relationship with said receiving layer. The invention also relates to a method for making lithographic plates with said imaging element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.