Method for developing lithographic plates comprising a developer comprising ethylene oxide/propylene oxide block copolymers
US4945030A · kind A · utility
14Cited by
14References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1989 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Aug 7, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/322
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing fluid for positive-acting, negative-acting and reversible lithographic printing plates comprises a metasilicate as alkali together with an ethylene oxide/propylene oxide block copolymer and, optionally, sodium tetraborate, a phosphate ester, and anti-foaming agent and a water-softening or sequestering agent. The fluid has a high alkali content for reducing the need for frequent replenishment while at the same time minimizing damage to the image particularly in negative and reversed plates and avoiding unacceptable foaming and turbidity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.