公开(公告)号：US20020168582A1

公开(公告)日：2002-11-14

申请号：US10087244

申请日：2002-03-01

Applicant: AGFA-GEVAERT

Inventor： Joan Vermeersch ,  Marc Van Damme

IPC: G03F007/038 ,  G03F007/26

CPC classification number: B41C1/1025 ,  B41C2210/04 ,  B41C2210/06 ,  B41C2210/22 ,  B41C2210/24 ,  B41C2210/262 ,  Y10S430/145 ,  Y10S430/146

Abstract: A method of making a negative-working heat-sensitive lithographic printing plate precursor is disclosed, the method comprising the steps of (a) preparing an aqueous dispersion comprising particles of a hydrophobic thermoplastic polymer A which is not soluble or swellable in an aqueous alkaline developer and particles of a polymer B which is soluble or swellable in an aqueous alkaline developer but not soluble or swellable in water, wherein the glass transition temperature of polymer A is higher than the softening temperature of polymer B; (b) applying the aqueous dispersion on a lithographic substrate having a hydrophilic surface, thereby obtaining an image-recording layer; (c) overall heating the image-recording layer at a temperature which is higher than the softening temperature of polymer B without inducing coalescense of the particles of polymer A. The printing plate precursor has improved mechanical resistance.

Abstract translation: 公开了一种制备负性热敏平版印刷版前体的方法，该方法包括以下步骤：（a）制备包含疏水性热塑性聚合物A的颗粒的水性分散体，其在水性碱性显影剂中不溶或可溶胀 聚合物B的颗粒在水性碱性显影剂中是可溶的或可溶胀的，但在水中不溶或可膨胀，其中聚合物A的玻璃化转变温度高于聚合物B的软化温度; （b）将水性分散体涂布于具有亲水性表面的平版印刷基板上，从而得到图像记录层; （c）在高于聚合物B的软化温度的温度下整体加热图像记录层，而不会引起聚合物A的颗粒的聚结。印刷版前体具有改善的机械阻力。

公开(公告)号：US20020146644A1

公开(公告)日：2002-10-10

申请号：US10116948

申请日：2002-04-05

Applicant: AGFA-GEVAERT

Inventor： Joan Vermeersch ,  Marc Van Damme

IPC: B41C001/10 ,  G03F007/075 ,  G03F007/11 ,  G03F007/30

CPC classification number: B41C1/1016 ,  B41C2201/04 ,  B41C2210/02 ,  B41C2210/06 ,  B41C2210/22 ,  B41C2210/24 ,  B41C2210/262 ,  B41M5/368 ,  B41N1/14 ,  G03F7/0752 ,  Y10S430/145

Abstract: A positive-working printing plate precursor for wet lithographic printing is disclosed which comprises a support having a hydrophilic surface and a coating comprising a first layer closest to the support, said first layer containing an oleophilic phenolic resin soluble in an aqueous alkaline developer, and a second layer containing an amphyphilic polymer, wherein (a) the second layer is capable of preventing the aqueous alkaline developer from penetrating into the first layer to an extent that substantially no dissolution of unexposed coating occurs upon immersion in the aqueous alkaline developer during a time period t2; (b) and wherein said capability of the second layer of preventing the aqueous alkaline developer from penetrating into the first layer is reduced upon exposure to heat or light to an extent that substantially complete dissolution of exposed coating occurs upon immersion in the aqueous alkaline developer during a time period t1; wherein t2>t1 and t2nullt1 is at least 10 seconds; and wherein the amphyphilic polymer is a block- or graft-copolymer comprising (i) a poly(alkylene oxide) block and (ii) a block comprising siloxane and/or perfluorohydrocarbon units.

Abstract translation: 公开了用于湿平版印刷的正性印刷版前体，其包含具有亲水表面的载体和包含最靠近载体的第一层的涂层，所述第一层含有可溶于碱性显影液的亲油酚醛树脂，和 第二层，其包含（a）第二层能够防止水性碱性显影剂渗透到第一层中，使得在一段时间内浸没在碱性显影液中时基本上不会溶解未曝光的涂层 t2; （b），并且其中防止水性碱性显影剂渗透到第一层中的第二层的所述能力在暴露于热或光时降低至在浸入含水碱性显影剂中时基本上完全溶解暴露涂层的程度 时间段t1; 其中t2> t1和t2-t1至少为10秒; 并且其中所述无亲性聚合物是包含（i）聚（环氧烷）嵌段和（ii）包含硅氧烷和/或全氟烃单元的嵌段的嵌段或接枝共聚物。