公开(公告)号：EP1000387A1

公开(公告)日：2000-05-17

申请号：EP98939645.2

申请日：1998-07-30

申请人： Kodak Polychrome Graphics LLC

发明人： PAPPAS, Socrates, Peter ,  BAUMANN, Harald ,  DWARS, Udo ,  SAVARIA-HAUCK, Cellin, M. ,  TIMPE, Hans-Joachim

IPC分类号： G03F7/09

CPC分类号： G03F7/092 ,  Y10T428/31 ,  Y10T428/31721 ,  Y10T428/31855 ,  Y10T428/31935

摘要： The invention relates to water-soluble layers which in addition to polyvinyl alcohol comprise poly(1-vinylimidazole) or a copolymer of 1-vinylimidazole and at least one further monomer as a further component. These layers can be used as an overcoat on the light-sensitive layer of printing plates.

公开(公告)号：EP0939698A1

公开(公告)日：1999-09-08

申请号：EP98939401.0

申请日：1998-08-14

申请人： Kodak Polychrome Graphics LLC

发明人： 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分类号： B41C1 ,  B41M5

CPC分类号： B41C1/1008 ,  B41C2210/02 ,  B41C2210/06 ,  B41C2210/24 ,  B41C2210/262 ,  B41M5/36 ,  B41M5/368 ,  Y10S430/107 ,  Y10S430/145

摘要： 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-naphthoquinone 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.