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1. (WO1998051496) IMPROVEMENTS IN OR RELATING TO THE FORMATION OF IMAGES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/051496 International Application No.: PCT/EP1998/002832
Publication Date: 19.11.1998 International Filing Date: 08.05.1998
Chapter 2 Demand Filed: 18.11.1998
IPC:
B41C 1/10 (2006.01) ,B41M 5/36 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
41
PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
C
PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
1
Forme preparation
10
for lithographic printing; Master sheets for transferring a lithographic image to the forme
B PERFORMING OPERATIONS; TRANSPORTING
41
PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
M
PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
5
Duplicating or marking methods; Sheet materials for use therein
26
Thermography
36
using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its properties, e.g. of its optical, hydrophobic-hydrophilic, solubility or permeability properties
Applicants:
AGFA-GEVAERT NAAMLOZE VENNOOTSCHAP [BE/BE]; Septestraat 27 B-2640 Mortsel, BE (AllExceptUS)
OBUCHOWICZ, Jacek, Paul [GB/GB]; GB (UsOnly)
ZUMSTEG, Fredrick, Claus [US/US]; US (UsOnly)
Inventors:
OBUCHOWICZ, Jacek, Paul; GB
ZUMSTEG, Fredrick, Claus; US
Priority Data:
9709404.910.05.1997GB
Title (EN) IMPROVEMENTS IN OR RELATING TO THE FORMATION OF IMAGES
(FR) AMELIORATIONS DE FORMATION D'IMAGES
Abstract:
(EN) The invention provides a radiation sensitive plate which is imageable by exposure to thermal radiation and comprises (a) a substrate; (b) an imaging layer containing a disperse phase comprising a water insoluble heat softenable component, a continuous phase comprising a component which is soluble or swellable in aqueous medium and a substance capable of strongly absorbing radiation and transferring the energy as heat ot the disperse phase to cause at least partial coalescence of the coating; and (c) a topmost covering layer having an optical density which is lower than that of the imaging layer at the wavelength of exposure and contains either a combination of a disperse phase and a continuous phase, or a polymer resin which is soluble or dispersible in aqueous medium. A method of image formation is also disclosed. The invention overcomes the difficulties associated with surface overheating which are observed with prior art materials, and provides printing plates showing improved press performance.
(FR) L'invention concerne une plaque radiosensible qui peut former une image par exposition aux rayonnements thermiques. Cette plaque comprend (a) un substrat; (b) une couche de formation d'image renfermant une phase dispersée comprenant un composant ramolissant à la chaleur et insoluble dans l'eau, une phase continue comportant un composant soluble ou pouvant gonfler dans un milieu aqueux et une substance permettant d'absorber fortement les rayonnements et de transférer l'énergie sous forme de chaleur à la phase dispersée pour provoquer au moins une coalescence partielle du revêtement; (c) une couche de revêtement supérieure dont la densité optique est inférieure à celle de la couche de formation d'image, à la longueur d'onde d'exposition, et qui contient une combinaison d'une phase dispersée et d'une phase continue, ou une résine polymère qui est soluble ou peut se disperser dans un milieu aqueux. L'invention traite également d'un procédé de formation d'images. L'invention permet de résoudre les problèmes associés à la surchauffe de surface fréquemment observés avec les matériaux de l'art antérieur, et permet d'obtenir des plaques d'impression présentant une meilleure tenue de presse.
Designated States: JP, US
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0981442US6312866JP2001524894 DE000069818447GB2325055