Global Patent Index - EP 1295717 B1

EP 1295717 B1 20070725 - 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 B1 20070725 (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 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 (examination)

None

Designated contracting state (EPC)

DE FR GB NL

DOCDB simple family (publication)

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

DOCDB simple family (application)

EP 02102309 A 20020905