公开(公告)号：US07129021B2

公开(公告)日：2006-10-31

申请号：US10647905

申请日：2003-08-25

申请人： Horst Noglik ,  Tibor Horvath ,  Joyce Diana Dewi Djauhari Lukas ,  David A. Morgan

发明人： Horst Noglik ,  Tibor Horvath ,  Joyce Diana Dewi Djauhari Lukas ,  David A. Morgan

IPC分类号： G03C1/76 ,  G03F7/038 ,  G03F7/11 ,  G03F7/20

CPC分类号： B41C1/1041 ,  Y10S430/145 ,  Y10S430/146

摘要： Polymer materials are described that undergo a two-level three-dimensional crosslinking process. During this process, hydrophilic polymers are crosslinked at two levels, the first results in a low level of crosslinking which leads to a toughening of the layer preventing dissolution by the fountain solution but with the layer remaining hydrophilic. The second level of crosslinking is higher and is the result of exposure to a laser diode thermal imaging device. The crosslinking at this second level results in a loss of hydrophilicity and provides instead an oleophilic image capable of accepting and transferring oil-based ink. The polymer materials are particularly useful in lithographic printing systems where they may used in articles such as a printing plate comprising a substrate having coated thereon a layer that becomes less hydrophilic upon exposure to thermal energy (e.g., heat applied by a laser, other collimated light, or thermal printhead) that effects crosslinking (initial crosslinking or increased crosslinking) in the layer, the layer comprising a mixture of a crosslinked polymer and a thermally active crosslinking metal compound. The invention also provides an overcoat layer eluable in aqueous media for a printing plate precursor comprising on a substrate a layer comprising a mixture of a crosslinked polymer and a thermally active crosslinking metal compound. The overcoat layer protects the heat-sensitive crosslinked polymer layer from discoloration, contamination and scratching and reduces odor and particulate emissions.

摘要翻译： 描述了经历两级三维交联过程的聚合物材料。 在此过程中，亲水性聚合物以两个水平交联，首先导致低水平的交联，这导致层的增韧，防止润版液溶解，但是该层保持亲水性。 第二级交联更高，并且是暴露于激光二极管热成像装置的结果。 在该第二水平下的交联导致亲水性的丧失，并提供能够接受和转移油基油墨的亲油图像。 聚合物材料在平版印刷系统中特别有用，其中它们可用于制品中，例如印版，其包括其上涂覆有暴露于热能时变得不那么亲水的层（例如，由激光施加的热量，其他准直光 ，或热打印头），其在层中实现交联（初始交联或增加交联），所述层包含交联聚合物和热活性交联金属化合物的混合物。 本发明还提供了可在含水介质中洗脱的印刷版前体的外涂层，其在基底上包含交联聚合物和热活性交联金属化合物的混合物的层。 外涂层保护热敏交联聚合物层免受变色，污染和划伤，并减少气味和微粒排放。