Preparing waterless lithographic printing masters by ink jet printing

• US 4,003,312 A
• Filed: 12/16/1974
• Issued: 01/18/1977
• Est. Priority Date: 12/16/1974
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Gunther, Wolfgang H. H.
• Primary Examiner(s): Coughenour, Clyde I.
• Application Number:
  US05/533,035
• Time in Patent Office: 764 Days
• Field of Search: 101/466, 101/401.1, 156/306, 156/272, 346/75, 427/144, 427/258, 427/387, 427/288
• US Class Current: 101/466
• CPC Class Codes: B41C 1/1066 by spraying with powders, by using a nozzle, e.g. an ink jet system, by fusing a previously coated powder, e.g. with a laser
• CPC Class Codes: B41C 2210/16 Waterless working, i.e. ink repelling exposed (imaged) or non-exposed (non-imaged) areas, not requiring fountain solution or water, e.g. dry lithography or driography
• CPC Class Codes: B41N 1/003 with ink abhesive means or abhesive forming means, such as abhesive siloxane or fluoro compounds, e.g. for dry lithographic printing
• CPC Class Codes: Y10S 430/136 Coating process making radiation sensitive element

Abstract

Novel means for preparing waterless lithographic printing masters by ink jet imaging means are provided. A master is provided by depositing a silicone or other material which can be rendered ink releasing on a suitable master substrate by means of an ink jet printing apparatus, and curing the silicone to an elastomeric ink releasing condition. Alternatively, an ink jet printing apparatus can be employed to deposit in image configuration, a catalyst to an uncured silicone on a master substrate, a photopolymer to a cured silicone on a master substrate which photopolymer can be cured to combine with the silicone, or an imaging light insensitive shadow fluid to a light sensitive curable silicone coated on a master substrate whereby the background nonimaged areas can be cured and the shadow fluid and underlying silicone removed to reveal the ink accepting substrate.

Claims

1. A process for preparing a printing master comprising coating a master substrate with a silicone curable to an elastomeric adhesive ink releasing condition, said silicone having reactive pendant groups, selectively imaging the resultant coated substrate by discharging an imaging fluid from an ink jet printing apparatus as droplets by selectively emitting or deflecting said droplets in accordance with an information source wherein the imaging fluid is an ink-accepting material having groups reactive with the silicone pendant groups, curing the silicone to an adhesive ink releasing condition, and grafting the imaging material to said silicone.