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1. WO1997044711 - PLAQUES D'IMPRESSION LITHOGRAPHIQUES A TRANSFERT PAR ABLATION THERMIQUE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

What is claimed is:
1. An infra-red laser-induced imaging method for multilayed presensitized lithographic plate precursor (s) , said method comprising:
i. inscribing an image upon said plate with said
laser wherein said plate comprises a substrate, a first presensitized positive-working or negative- working coating layer on said substrate, a second layer comprising a UV-opaque, thermal ablation
transfer donor-element, and a third IR transparent film layer;
ii. treating said inscribed plate to remove that
portion of said second and third layers unexposed to said IR laser;
iii. exposing said treated plate overall to
ultraviolet light; and
iv. image-wise developing said first layer.

2. The method of claim 1 wherein said presensitized plate further contains an intermediate UV transparent film layer between said first and second layer, wherein said intermediate layer is removed after exposing said treated plate overall to UV light.

3. The method of claim 2 wherein said presensitized plates comprise positive-working presensitized plates.

4. The method of claim 1 wherein said presensitized plates comprise negative-working presensitized plates.

5. The method of claim 1 wherein said donor-element comprises organic solvent soluble binder resins, waxy tackifiers, UV-dyes, infrared dyes and UV-absorbers soluble.

6. The method of claim 1 wherein said image is inscribed by a digitally controlled IR laser.

7. An infra-red laser imagable lithographic printing plate precursor comprising:
a supporting substrate;
a first layer on said substrate comprising a
positive-working or negative-working coating;
a second layer comprising a thermal ablative
transfer donor-element coating; and
a third IR transparent film layer.

8. The plate of claim 7 further containing an intermediate UV transparent film layer between said first and second layer.

9. The plate of claim 7 wherein said donor-element comprises water or aqueous alkali soluble binder resins, waxy tackifiers, UV-dyes, infra-red dyes and UV-absorbers.

10. The method of claim wherein said plate
comprises a waterless plate comprising a supporting substrate, a first oleophilic coating on said substrate, a second presensitizing positive-working or negative-working coating layer, a third layer comprising a
silicone rubber coating, a fourth layer comprising a UV transparent film, a fifth layer comprising said donor-element coating and a sixth layer comprising said IR transparent film; wherein said method further includes the steps of:
i. removing the sixth layer and that portion of the fifth layer unexposed to the IR laser;
ii. exposing said plate overall to ultraviolet
light;
iii. removing said UV transparent film;
V. developing the silicone rubber layer to remove the unexposed portion of said silicone.

11. The method of claim 10 wherein said donor element comprises organic solvent soluble binder resins, waxy tackifiers, UV-dyes, infrared dyes and UV-absorbers soluble.

12. The method of claim 10 wherein said UV
transparent film is selected from the group comprising polyolefin film, cellulose acetate, polyester,
polyimidies, and polyvinyl acetate, and said IR
transparent film comprises polyester film.

13. The method of claim 10 wherein said UV
transparent film comprises polypropylene.

14. The method of claim 10 wherein said IR
transparent film comprises polyester film.

15. The method of claim 10 wherein said oleophilic coating comprises an epoxy coating or polyurethane coating.

16. An infra-red laser imagable waterless
lithographic printing plate precursor comprising:
a supporting substrate;
a first layer on said substrate comprising an oleophilic coating;
a second presensitizing positive-working or
negative-working coating layer;
a third layer comprising a silicone rubber coating; a fourth layer comprising a UV transparent film;
a fifth layer comprising a thermal ablative transfer donor-element coating; and
a sixth layer comprising an IR transparent film.

17. The plate of claim 16 wherein said donor-element comprises organic solvent soluble binder resins, waxy tackifiers, UV-dyes, infrared dyes and UV-absorbers.