公开(公告)号：US06720130B1

公开(公告)日：2004-04-13

申请号：US10266888

申请日：2002-10-08

Applicant: Xing-Fu Zhong ,  Shashikant Saraiya ,  S. Peter Pappas

Inventor： Xing-Fu Zhong ,  Shashikant Saraiya ,  S. Peter Pappas

IPC: G03F716

CPC classification number: B41C1/1016 ,  B41C2201/04 ,  B41C2201/14 ,  B41C2210/04 ,  B41C2210/08 ,  B41C2210/24 ,  G03F7/202 ,  Y10S430/165

Abstract: The present invention relates to a negative-working radiation imageable lithographic printing plate precursor, preferably having only two polymeric layers on a support. The first (bottom) layer is composed of oleophilic polymers and a photothermal converter which converts radiation to heat. The second polymeric layer (top) is composed of crosslinked hydrophilic polymers which absorb aqueous fountain solution and repel ink. The oleophilic polymers in the first layer contain functional groups are interlayer chemically bonded to the hydrophilic polymer in the second layer to provide interlayer adhesive bonding between the two layers. The plate is imagewise exposed to radiation, such as with an IR laser, resulting in non-ablative adhesion-weakening between the two layers so that the plate can be developed by fountain solution and/or ink on press whereby the top layer in the exposed area is removed on the press to reveal the ink-receptive image area. The top layer in the unexposed area remains as the non-image area.

Abstract translation: 本发明涉及一种负性可辐射成像平版印刷版原版，优选在载体上仅具有两个聚合物层。 第一（底部）层由亲油聚合物和将辐射转化为热的光热转换器组成。 第二聚合物层（顶部）由吸收润版液并排斥油墨的交联亲水聚合物组成。 第一层中含有的亲油聚合物含有官能团，在第二层中与亲水性聚合物中间化学键合，以提供两层之间的层间粘合剂粘合。将该板成像曝光于辐射下，例如用IR激光， 在两层之间 - 消除粘合力弱化，使得板可以通过润版液和/或印刷机上的油墨显影，由此在印刷机上除去暴露区域中的顶层以露出吸墨图像区域。 未曝光区域中的顶层保持为非图像区域。

公开(公告)号：US5948596A

公开(公告)日：1999-09-07

申请号：US863770

申请日：1997-05-27

Applicant: Xing-Fu Zhong ,  Ken-ichi Shimazu ,  S. Peter Pappas ,  Tore Harms ,  Thi Do ,  Shashikant Saraiya ,  William P. Keaveney

Inventor： Xing-Fu Zhong ,  Ken-ichi Shimazu ,  S. Peter Pappas ,  Tore Harms ,  Thi Do ,  Shashikant Saraiya ,  William P. Keaveney

IPC: B41C1/10 ,  G03C1/73

CPC classification number: B41C1/1016 ,  B41C2201/04 ,  B41C2210/02 ,  B41C2210/04 ,  B41C2210/06 ,  B41C2210/16 ,  B41C2210/24

Abstract: Presensitized lithographic plates are prepared which permit direct formation of printable images on plates by digital computerization without the intervening formation of a photographic image with a quality that allows the plates to be used for high volume printing applications. The lithographic printing plate has a structure which contains a substrate; a positive or negative working photosensitive layer; and a thermally sensitive masking layer which is opaque to the actinic radiation but which is soluble in an aqueous medium. The masking layer contains a heat softenable disperse phase which is insoluble in the aqueous medium; a polymeric continuous phase which is soluble or swellable in the aqueous medium; and a colorant which strongly absorbs radiant energy and converts the radiant energy to heat. In use the masking layer is digitally exposed to a computer controlled laser image so that exposed image areas of the masking are insolublized in the aqueous medium; soluble areas of the mask layer are then removed to form an opaque image mask on the photosensitive layer which is then exposed to actinic radiation passing through the mask to solubilize or insolubilize exposed areas of the photosensitive layer; the photosensitive layer is then developed with the developer liquid to remove the soluble areas and any overlying mask areas to form the lithographic printing plate. Both wet and waterless lithographic printing plates may be digitally prepared in this manner.

Abstract translation: 制备预感光刻平板，其允许通过数字计算机化在板上直接形成可印刷图像，而不用介质形成摄影图像，其质量允许将板用于大容量印刷应用。 平版印刷版具有包含基板的结构; 正或负工作感光层; 以及对光化辐射不透明但可溶于水性介质的热敏屏蔽层。 掩蔽层含有不溶于水介质的可热软化分散相; 在水性介质中可溶或溶胀的聚合物连续相; 以及强烈吸收辐射能并将辐射能转化为热的着色剂。 在使用中，掩模层被数字地暴露于计算机控制的激光图像，使得掩蔽的曝光图像区域在水性介质中被分散; 然后去除掩模层的可溶性区域以在感光层上形成不透明图像掩模，然后将其暴露于通过掩模的光化辐射，以增溶或不溶化感光层的曝光区域; 然后用显影剂液体显影感光层以除去可溶性区域和任何覆盖的掩模区域以形成平版印刷版。 湿式和无水平版印刷版可以以这种方式数字地制备。