公开(公告)号：AT250497T

公开(公告)日：2003-10-15

申请号：AT98939401

申请日：1998-08-14

Applicant: KODAK POLYCHROME GRAPHICS LLC

Inventor： NGUYEN MY T ,  MERCHANT NISHITH ,  SHIMAZU KEN-ICHI ,  PAPPAS PETER S ,  HALLMAN ROBERT W ,  KESSELMAN JEROME P ,  SAVARIAR-HAUCK CELIN ,  HAUCK GERHARD ,  TIMPE HANS-JOACHIM

IPC: B41C1/10 ,  B41M5/36 ,  G03F7/004 ,  G03F7/023

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. Within a short time period of the imaging exposure, the imaged layer is developed with an aqueous alkaline developing solution to form the lithographic printing surface. In this method, the infrared radiation preferably is laser radiation which is digitally controlled.

公开(公告)号：ES2206975T3

公开(公告)日：2004-05-16

申请号：ES98939401

申请日：1998-08-14

Applicant: KODAK POLYCHROME GRAPHICS LLC

Inventor： NGUYEN MY T ,  MERCHANT NISHITH ,  SHIMAZU KEN ,  PAPPAS PETER S ,  HALLMAN ROBERT W ,  KESSELMAN JEROME P

IPC: B41C1/10 ,  B41M5/36 ,  G03F7/004 ,  G03F7/023

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. Within a short time period of the imaging exposure, the imaged layer is developed with an aqueous alkaline developing solution to form the lithographic printing surface. In this method, the infrared radiation preferably is laser radiation which is digitally controlled.