Global Patent Index - EP 0908304 B1

EP 0908304 B1 20030402 - A method for making positive working printing plates from a heat mode sensitive imaging element

Title (en)

A method for making positive working printing plates from a heat mode sensitive imaging element

Title (de)

Verfahren zur Herstellung einer positiv arbeitenden Druckplatte aus wärmempflindlichem Bildaufzeichungsmaterial

Title (fr)

Procédé pour la fabrication d'une plaque d'impression positive à partir d'un élément pour l'enregistrement de l'image thermosensible

Publication

EP 0908304 B1 20030402 (EN)

Application

EP 98203119 A 19980916

Priority

  • EP 98203119 A 19980916
  • EP 97203132 A 19971008

Abstract (en)

[origin: EP0908304A1] According to the present invention there is provided a method for making lithographic printing plates including the following steps a) preparing a heat mode imaging element consisting of a lithographic base with a hydrophilic surface and a top layer which top layer is sensitive to IR-radiation, comprises a polymer, soluble in an aqueous alkaline solution and is unpenetrable for an alkaline developer containing SiO2 as silicates; b) exposing imagewise said heat mode imaging element to IR-radiation; c) developing said imagewise exposed heat mode imaging element with said alkaline developer so that the exposed areas of the top layer are dissolved and the unexposed areas of the top layer remain undissolved characterized in that said top layer includes an IR-absorbing pigment and 3,4,5-trimethoxybenzoic acid or a benzofenone.

IPC 1-7

B41C 1/10; B41M 5/36

IPC 8 full level

B41C 1/10 (2006.01); B41M 5/36 (2006.01)

CPC (source: EP)

B41C 1/1016 (2013.01); B41C 2201/04 (2013.01); B41C 2210/02 (2013.01); B41C 2210/06 (2013.01); B41C 2210/14 (2013.01); B41C 2210/22 (2013.01); B41C 2210/24 (2013.01); B41C 2210/262 (2013.01)

Designated contracting state (EPC)

BE DE FR GB

DOCDB simple family (publication)

EP 0908304 A1 19990414; EP 0908304 B1 20030402

DOCDB simple family (application)

EP 98203119 A 19980916