My H Nguyen

US Patent:

59196017, Jul 6, 1999

Filed:

Nov 12, 1996

Appl. No.:

8/745534

Inventors:

My T. Nguyen - Cliffwood NJ
Shashikant Saraiya - Parlin NJ
Frederic E. Mikell - Parsippany NJ
Ken-ichi Shimazu - Briarcliff Manor NY
S. Peter Pappas - Wood-Ridge NJ
Robert W. Hallman - Palisades Park NJ
Ajay Shah - Livingston NJ
Hans-Joachim Timpe - Osterode, DE
Celin Savariar-Hauck - Badenhausen, DE

Assignee:

Kodak Polychrome Graphics, LLC - Norwalk CT

International Classification:

G03C 177
G03F 709
G03F 7004

US Classification:

4302781

Abstract:

Radiation-sensitive compositions, printing plates containing such compositions, imageable by infrared and ultraviolet/visible radiation and imaging method using same. The compositions comprise a thermal-activated acid generator; a crosslinking resin; a binder resin comprising a polymer containing reactive pendant groups selected from hydroxy, carboxylic acid, sulfonamide, and alkoxymethylamides; an infrared absorber; and optionally a UV/visible radiation-activated acid generator for UV/visible sensitization.

US Patent:

60602171, May 9, 2000

Filed:

Sep 2, 1997

Appl. No.:

8/922190

Inventors:

My T. Nguyen - Cliffwood NJ
Nishith Merchant - North Bergen NJ
Ken-Ichi Shimazu - Briaicliff Manor NY
S. Peter Pappas - Wood Ridge NJ
Robert Hallman - Palinskle Park NJ
Jerome Philip Kesselman - Yorktown Heights NY
Celin Savariar-Hauck - Badenhausen, DE
Gerhard Hauck - Badenahusen, DE
Hans-Joachim Timpe - Osterode, DE
Omkar J. Natu - Warren NJ
Ajay Shah - Livingston NJ

Assignee:

Kodak Polychrome Graphics LLC - Norwalk CT

International Classification:

G03F 730

US Classification:

430302

Abstract:

A method for directly imaging a lithographic printing surface using infrared radiation without the requirement of pre- or post-UV-light exposure, or heat treatment employs a printing plate which contains a support with a hydrophilic surface overcoated with an imaging layer. The imaging layer contains at least one polymer having bonded pendent groups which are hydroxy, carboxylic acid, tert-butyl-oxycarbonyl, sulfonamide, amide, nitrile, urea, or combinations thereof; as well as an infrared absorbing compound. The imaging layer may contain a second polymer which has bonded pendent groups which are 1,2-napthoquinone diazide, hydroxy, carboxylic acid, sulfonamide, hydroxymethyl amide, alkoxymethyl amide, nitrile, maleimide, urea, or combinations thereof. The imaging layer may also contain a visible absorption dye, a solubility inhibiting agent, or both. In practice, the imaging layer is imagewise exposed to infrared radiation to produce exposed image areas in the imaged layer which have transient solubility in aqueous alkaline developing solution, so that solubility is gradually lost over a period of time until the imaged areas become as insoluble as non-imaged areas.