Method for making lithographic printing plates according to the silver salt diffusion transfer process
US5449585A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1994 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Jun 29, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/066
- 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 having improved printing properties comprising the step of developing an imaging element comprising in the order given (i) a hydrophilic base, (ii) an image receiving layer containing physical development nuclei and (iii) a photosensitive layer containing a silver halide emulsion in the presence of a 1-phenyl-5-mercapto-tetrazole, being substituted by one or two substituents from the group consisting of: PA1 (i) a --COOM group with M representing hydrogen, a metal cation, or an ammonium group, PA1 (ii) a --SO.sub.3 M.sup.1 group, M.sup.1 representing hydrogen, a metal cation, or an ammonium group, PA1 (iii) an acylamido group, PA1 (iv) and a substituent containing at least one of the aforementioned substituents (i)-(iv).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.