Global Patent Index - EP 0974455 A1

EP 0974455 A1 2000-01-26 - Dry method for preparing a thermal lithographic printing plate precursor

Title (en)

Dry method for preparing a thermal lithographic printing plate precursor

Title (de)

Trockenes Verfahren zur Herstellung eines thermischen lithographischen Druckplatten Precursors

Title (fr)

Procédé à sec de préparation d'un précurseur de plaque lithographique obtenue par voie thermique

Publication

EP 0974455 A1 (EN)

Application

EP 99202010 A

Priority

  • EP 99202010 A
  • EP 98202381 A

Abstract (en)

A method is provided for preparing a negative working lithographic printing plate precursor by applying a dry powder, containing a light absorbing compound in an amount not less than 50% by weight, on a metal support such as an anodised aluminium plate. The light absorbing compound is preferably carbon, soot or an infrared dye. In one embodiment of the invention, the dry powder may be rubbed in on the surface of the metal support. In another embodiment a layer of soot is applied on the metal support by contacting the surface of said support with a flame. In still another embodiment, a metal support is contacted with a transfer material consisting of a support and a dry layer of a light absorbing compound such as carbon. By applying heat or light, the dry powder is converted into a hydrophobic substance at the printing areas of the plate. The materials obtained by these methods are very suitable for computer-to-plate and computer-to-press applications as they can be processed by applying plain water, ink or fountain. Since the dry powder is preferably free from other reactive compounds besides the light absorbing compound, the materials are characterised by an excellent stability.

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

B41C 1/10

IPC 8 full level (invention and additional information)

B41C 1/10 (2006.01)

CPC (invention and additional information)

B41C 1/1066 (2013.01); B41C 1/10 (2013.01)

Citation (search report)

Designated contracting state (EPC)

BE DE FR GB

EPO simple patent family

EP 0974455 A1 20000126; EP 0974455 B1 20030903

INPADOC legal status


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2010-02-24 [GBPC] GB: EUROPEAN PATENT CEASED THROUGH NON-PAYMENT OF RENEWAL FEE

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2004-08-25 [26N] NO OPPOSITION FILED

- Effective date: 20040604

2004-05-28 [ET] FR: TRANSLATION FILED

2003-10-09 [REF] CORRESPONDS TO:

- Document: DE 69910915 P 20031009

2003-09-03 [AK] DESIGNATED CONTRACTING STATES:

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- Designated State(s): BE DE FR GB

2003-09-03 [REG GB FG4D] EUROPEAN PATENT GRANTED

2003-09-03 [PG25 BE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Effective date: 20030903

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- Owner name: AGFA-GEVAERT

2000-10-04 [AKX] PAYMENT OF DESIGNATION FEES

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2000-09-20 [17P] REQUEST FOR EXAMINATION FILED

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2000-01-26 [AK] DESIGNATED CONTRACTING STATES:

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2000-01-26 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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