Digital laser imagable lithographic printing plates
US6143470A · kind A · utility
Inventors
Key dates
| Filing date | Jun 23, 1995 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Jun 23, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41C2210/16
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Lithographic printing plates for wet or waterless offset printing are disclosed which can be imagewise exposed using a digitally controlled IR laser. The invention comprises a laser imagable lithographic printing plate comprising a substrate, a photosensitive coating on the substrate, and a water soluble laser ablatable top coating containing dyes or polymers that absorb infra-red, ultraviolet and visible light. Laminated transparent polymer films and/or peelable polymeric coatings films can be interposed between the coated substrate and a water soluble and/or organic solvent soluble laser ablatable top layer to augment plate production or image inscription on the plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.