Process for preparing positive or negative lithographic printing plates using a developer having at least one alkali-soluble mercapto compound and/or thioether compound
US5126229A · kind A · utility
5Cited by
6References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 1, 1990 |
| Grant date | Jun 30, 1992 |
| Priority date | — |
| Expiry date | May 1, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/322
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developer composition comprises an aqueous alkaline solution which contains at least one alkali-soluble mercapto compound and/or thioether compound. The developer composition is excellent in developing properties and provides lithographic printing plates which do not cause background contamination of non-image areas during printing, when it is used in developing PS plates. It can be stored for a long time. The developer composition further makes it possible to develop both negative and positive working PS plates if its pH value is not less than 12.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.