公开(公告)号：US6060217A

公开(公告)日：2000-05-09

申请号：US922190

申请日：1997-09-02

申请人： My T. Nguyen ,  Nishith Merchant ,  Ken-Ichi Shimazu ,  S. Peter Pappas ,  Robert Hallman ,  Jerome Philip Kesselman ,  Celin Savariar-Hauck ,  Gerhard Hauck ,  Hans-Joachim Timpe ,  Omkar J. Natu ,  Ajay Shah

发明人： My T. Nguyen ,  Nishith Merchant ,  Ken-Ichi Shimazu ,  S. Peter Pappas ,  Robert Hallman ,  Jerome Philip Kesselman ,  Celin Savariar-Hauck ,  Gerhard Hauck ,  Hans-Joachim Timpe ,  Omkar J. Natu ,  Ajay Shah

IPC分类号： B41C1/10 ,  B41M5/36 ,  G03F7/30

CPC分类号： B41C1/1008 ,  B41M5/368 ,  B41C2210/02 ,  B41C2210/06 ,  B41C2210/24 ,  B41C2210/262 ,  B41M5/36 ,  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-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.

摘要翻译： 使用红外线辐射直接对平版印刷表面进行成像的方法，而不需要进行紫外线照射之前或之后的曝光或热处理，使用包含具有用成像层涂覆的亲水表面的载体的印刷版。 成像层含有至少一种具有键合的侧基的聚合物，其为羟基，羧酸，叔丁基 - 氧羰基，磺酰胺，酰胺，腈，脲或其组合; 以及红外线吸收剂。 成像层可以含有具有键合的侧基的第二聚合物，其为1,2-萘醌二叠氮，羟基，羧酸，磺酰胺，羟甲基酰胺，烷氧基甲基酰胺，腈，马来酰亚胺，脲或其组合。 成像层还可以含有可见吸收染料，溶解性抑制剂，或两者。 在实践中，成像层被成像地暴露于红外辐射，以在成像层中产生在含水碱性显影液中具有瞬时溶解度的曝光图像区域，使得溶解度在一段时间内逐渐丧失，直到成像区域变得不溶于 非成像区域。 在成像曝光的短时间内，用含水碱性显影液显影成像层以形成平版印刷表面。 在该方法中，红外辐射优选为数字控制的激光辐射。