C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 8/28 (2006.01) B41C 1/10 (2006.01) G03F 7/00 (2006.01)
Patent
CA 2585304
The invention provides a near infrared absorption polymer comprising at least two different pendent infra-red chromophoric moieties covalently bonded to the backbone of an alkali-soluble resin, at least one of which is an indole cyanine dye and the other of which is a benz [e]-indole cyanine dye. When used in the coating of a heat sensitive positive working lithographic printing plate precursor the stabilization time needed after manufacture is significantly reduced, avoiding further conditioning processes before use. The precursors are preferably imagewise exposed with a near-infrared laser emitting at between 780 nm and 850 nm.
La présente invention concerne un polymère absorbant le proche infrarouge qui comprend au moins deux groupes chromophores infrarouges latéraux différents liés de manière covalente au squelette d~une résine soluble dans un alcalin, dont au moins un est un colorant de cyanine indole et l~autre est un colorant de cyanine benz[e]-indole. Lorsqu~il est utilisé dans le revêtement d~un précurseur de plaque d~impression lithographique thermosensible à action positive, le temps de stabilisation nécessaire après sa fabrication est réduit de manière significative, évitant d~autres procédés de conditionnement avant son utilisation. Les précurseurs sont préférablement exposés à la manière d~une image avec un laser à infrarouge proche émettant à une longueur d~onde entre 780 nm et 850 nm.
Bentley Peter Jonathan
Nguyen My T.
Bentley Peter Jonathan
Ipagsa Industrial S.l.
Nguyen My T.
Smart & Biggar
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