Jian C Huang

US Patent:

6376140, Apr 23, 2002

Filed:

Nov 3, 2000

Appl. No.:

09/706521

Inventors:

Patrick R. Friedman - Bridgewater NJ
Jian Bing Huang - Wood Ridge NJ
Ken Shimazu - Briarcliff Manor NY
Shashikant Saraiya - Parlin NJ

Assignee:

Kodak Polychrome Graphics LLC - Norwalk CT

International Classification:

G03G 1326

US Classification:

430 49, 101457, 101467

Abstract:

A printing plate useful in lithographic printing is prepared by the process comprising: (a) applying an alkali soluble composition comprising at least one polymer composition to a hydrophilic surface on a substrate to provide the surface face with at least one layer which is alkali soluble at a pH in the range of about 6. 0 to 14. 0; (b) imaging the coated substrate electrostatically with a toner composition; (c) heating the imaged substrate a first time to a temperature greater than the glass transition temperature of the toner composition; (d) contacting the imaged substrate with an aqueous alkaline solution having a pH in the range of about 6. 0 to about 14. 0; and (e) heating the imaged substrate a second time to a temperature greater than the glass transition temperature of the toner composition. This printing plate is capable of long runs on press with good image quality and advantageously minimizes the occurrence of undesirable background toner âspeckingâ on press. Accordingly, the printing plate is satisfactory for demanding printing tasks such as four-color newspaper printing, financial printing and the like.