Global Patent Index - EP 1295717 A3

EP 1295717 A3 20030716 - Heat-sensitive positive-working lithographic printing plate precursor

Title (en)

Heat-sensitive positive-working lithographic printing plate precursor

Title (de)

Wärmeempfindlicher positiv arbeitender Flachdruckplattenvorläufer

Title (fr)

Précurseur de plaque lithographique positive sensible à la chaleur

Publication

EP 1295717 A3 20030716 (EN)

Application

EP 02102309 A 20020905

Priority

  • EP 02102309 A 20020905
  • EP 01000495 A 20010924

Abstract (en)

[origin: EP1295717A2] A lithographic printing plate precursor is disclosed which comprises (i) a support having a hydrophilic surface or which is provided with a hydrophilic layer and (ii) a coating provided thereon, the coating comprising an oleophilic layer which, upon image-wise exposure to heat or infrared light and subsequent immersion in an aqueous alkaline developer, dissolves in the developer at a higher dissolution rate in exposed areas than in unexposed areas, wherein the oleophilic layer comprises a polymer that is soluble in the developer and an organic dye in a amount sufficient to provide a visible color to the coating, characterized in that said organic dye does not reduce the dissolution rate of the unexposed areas in the developer. By using non-inhibiting dyes, the sensitivity of the precursor upon image-wise exposure is increased.

IPC 1-7

B41C 1/10

IPC 8 full level

B41C 1/10 (2006.01); B41N 1/08 (2006.01)

CPC (source: EP)

B41C 1/1008 (2013.01); B41C 1/1016 (2013.01); B41N 1/08 (2013.01); B41C 2210/02 (2013.01); B41C 2210/06 (2013.01); B41C 2210/22 (2013.01); B41C 2210/24 (2013.01); B41C 2210/262 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

DOCDB simple family (publication)

EP 1295717 A2 20030326; EP 1295717 A3 20030716; EP 1295717 B1 20070725

DOCDB simple family (application)

EP 02102309 A 20020905