Global Patent Index - EP 1025992 A1

EP 1025992 A1 2000-08-09 - A method for making positive printing plates

Title (en)

A method for making positive printing plates

Title (de)

Verfahren zur Herstellung positiv arbeitender Druckplatten

Title (fr)

Procédé de fabrication de plaques d'impression travaillant en positif

Publication

EP 1025992 A1 (EN)

Application

EP 99200292 A

Priority

EP 99200292 A

Abstract (en)

According to the present invention there is provided a method for the preparation of a lithographic printing plate comprising the steps of exposing with IR light an imaging element comprising on a lithographic base with a hydrophilic surface a first layer including a polymer, soluble in an aqueous alkaline solution and a top layer on the same side of the lithographic base as the first layer which top layer is IR-sensitive and unpenetratable for or insoluble in an alkaline developer wherein said first layer and said top layer may be one and the same layer, said imaging element comprising a siloxane surfactant; developing said exposed imaging element with an alkaline solution; gumming said developed imaging element with a baking gum solution; subjecting said gummed imaging element to a thermal treatment at a temperature above 50 DEG C; characterized in that said baking gum solution contains at least one surfactant making the contact angle between the baking gum solution and the surface of the plate less than 68 DEG and/or at least one viscosity-regulating polymer making the viscosity of the baking gum solution between 1.7 cP and 5.0 cP.

IPC 1-7 (main, further and additional classification)

B41C 1/10; B41N 3/08

IPC 8 full level (invention and additional information)

G03F 7/004 (2006.01); B41C 1/10 (2006.01); B41N 3/08 (2006.01); G03F 7/00 (2006.01); G03F 7/039 (2006.01)

CPC (invention and additional information)

B41C 1/1016 (2013.01); B41N 3/08 (2013.01); B41C 2201/02 (2013.01); B41C 2210/02 (2013.01); B41C 2210/04 (2013.01); B41C 2210/06 (2013.01); B41C 2210/14 (2013.01); B41C 2210/20 (2013.01); B41C 2210/22 (2013.01); B41C 2210/24 (2013.01); B41C 2210/262 (2013.01)

Citation (search report)

  • [A] EP 0864420 A1 19980916 - AGFA GEVAERT NV [BE]
  • [A] EP 0416861 A1 19910313 - FUJI PHOTO FILM CO LTD [JP]
  • [A] PATENT ABSTRACTS OF JAPAN vol. 097, no. 010 31 October 1997 (1997-10-31)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 014, no. 199 (P - 1040) 23 April 1990 (1990-04-23)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 013, no. 237 (M - 833) 5 June 1989 (1989-06-05)

Designated contracting state (EPC)

BE DE FR GB

EPO simple patent family

EP 1025992 A1 20000809; EP 1025992 B1 20030723; DE 69909734 D1 20030828; DE 69909734 T2 20040415; JP 2000221669 A 20000811

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