Method for making lithographic printing plates according to the silver salt diffusion transfer process
US6130023A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1994 |
| Grant date | Oct 10, 2000 |
| Priority date | — |
| Expiry date | Aug 15, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C11/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a method for making an offset printing plate according to the silver salt diffusion transfer process comprising the steps of: (a) image-wise exposing an imaging element comprising (i) a hydrophilic base, (ii) an image receiving layer containing physical development nuclei, (iii) an intermediate layer, and (iv) a silver halide emulsion layer, PA0 (b) applying an aqueous alkaline solution to the imaging element in the presence of (a) developing agent(s) and (a) silver halide solvent(s) to form image-wise in said image receiving layer a silver image, PA0 (c) treating the imaging element to remove the layer(s) on top of said image receiving layer, characterized in that said imaging element has been stored before image-wise exposure in a surrounding having at 22.degree. C. a relative humidity between 20% and 50%. According to the present invention there is also provided a package of the imaging element, making said imaging element suitable for use in the above defined method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.