Method of fountainless lithography
US4077324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1976 |
| Grant date | Mar 7, 1978 |
| Priority date | — |
| Expiry date | Feb 12, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41N1/003
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of producing a lithographic printing master, novel masters and a method of printing therefrom are provided which obviate the need for an aqueous fountain solution. The process for printing comprises applying an ink and a solvent (which may or may not be in the ink) to an imaged master and transferring the resultant developed image to a receiver member. The nonimaged portions of said master are formed of an ink releasing solvent swellable elastomer selected from organohydrocarbon backbone polymers (which may or may not contain hetero atoms), copolymers and mixtures. The solvent is a fluid capable of swelling the nonimaged areas of said elastomer but not capable of dissolving the elastomeric imaged master. The solvent is added in an amount to diffuse into the nonimaged areas of the imaged master and form a substantially ink-free layer on the nonimaged areas of the master during inking and transferring of the inked image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.