Multi-layer negative working imageable element
View Patent ↗Multi-layer, negative working imageable elements useful as lithographic printing plate precursors are disclosed. The elements contain, in order, a support; an underlayer; and an imageable layer. The imageable layer comprises a negative working imageable composition; and the underlayer is soluble or dispersible in a developer. Elements that can be imaged with ultraviolet or visible radiation and elements that can be imaged with infrared radiation or with heat are disclosed.
1. An imageable element comprising, in order:
a support;
an underlayer; and
an imageable layer;
in which:
the underlayer comprises a photothermal conversion material;
the imageable layer comprises a negative working imageable composition;
the underlayer is soluble or dispersible in a developer; and
the negative working imageable composition comprises a polymeric diazonium compound and a binder.
2. The element of claim 1 in which the binder is an acetalized polyvinyl alcohol with pendent carboxyl groups.
3. An imageable element comprising, in order:
a support;
an underlayer; and
an imageable layer;
in which:
the underlayer comprises a photothermal conversion material;
the imageable layer comprises a negative working imageable composition;
the underlayer is soluble or dispersible in a developer; and
the negative working imageable composition is a photopolymerizable composition.
4. The element of claim 3 in which the photopolymerizable composition comprises a photoinitiator system activatable by ultraviolet or visible radiation.
5. The element of claim 3 in which the photopolymerizable composition comprises a photoinitiator system activatable by infrared radiation.
6. The element of claim 3 in which the photothermal conversion material is a dye that absorbs in the range of 750 nm to 1200 nm.
7. An imageable element comprising, in order:
a support;
an underlayer; and
an imageable layer;
in which:
the imageable layer comprises a negative working imageable composition; and
the underlayer is soluble or dispersible in a developer; and
the underlayer comprises a copolymer that comprises about 35 to about 60 mol % of N-phenylmaleimide, about 15 to about 40 mol % of methacrylamide, and about 10 to about 30 mol % of methacrylic acid.
8. A method for forming an image, the method comprising the steps of, in order:
(A) imaging an imageable element and forming an exposed imageable element comprising exposed and unexposed regions, the imageable element comprising, in order:
a support;
an underlayer; and
an imageable layer;
in which:
the imageable layer comprises a negative working imageable composition;
the underlayer comprises a photothermal conversion material;
the underlayer is soluble or dispersible in a developer;
the negative working imageable composition comprises a monomer, a binder and a photoinitiator system activatable by ultraviolet or visible radiation; and
imaging is carried out with ultraviolet or visible radiation; and
(B) developing the exposed imageable element and removing the unexposed regions to form the image.
9. The method of claim 8 in which the photoinitiator system is activatable by ultraviolet radiation, and imaging is carried out with ultraviolet radiation.
10. A method for forming an image, the method comprising the steps of, in order:
(A) imaging an imageable element and forming an exposed imageable element comprising exposed and unexposed regions, the imageable element comprising, in order:
a support;
an underlayer; and
an imageable layer;
in which:
the imageable layer comprises a negative working imageable composition;
the underlayer comprises a photothermal conversion material;
the underlayer is soluble or dispersible in a developer;
the negative working imageable composition comprises a monomer, a binder and a thermally activatable initiator system; and
imaging is carried out with infrared radiation or with heat; and
(B) developing the exposed imageable element and removing the unexposed regions to form the image.
11. The method of claim 10 in which the initiator system is activatable by infrared radiation and imaging is carried out with infrared radiation.
12. A method for forming an image, the method comprising the steps of, in order:
(A) imaging an imageable element and forming an exposed imageable element comprising exposed and unexposed regions, the imageable element comprising, in order:
a support;
an underlayer; and
an imageable layer;
in which:
the imageable layer comprises a negative working imageable composition;
the underlayer comprises a photothermal conversion material;
the underlayer is soluble or dispersible in a developer;
the negative working imageable composition comprises a polymeric diazonium compound and a binder; and
(B) developing the exposed imageable element and removing the unexposed regions to form the image.
13. The method of claim 12 in which imaging is carried out with ultraviolet radiation.
14. The method of claim 12 in which imaging is carried out thermally.
15. The method of claim 12 in which the binder is a polymeric acetal resin.
16. An image useful as a lithographic printing plate prepared by a method comprising the steps of, in order:
(A) imaging an imageable element and forming an exposed imageable element comprising exposed and unexposed regions, the imageable element comprising, in order:
a support;
an underlayer; and
an imageable layer;
in which:
the imageable layer comprises a negative working imageable composition;
the underlayer comprises a photothermal conversion material;
the underlayer is soluble or dispersible in a developer;
the negative working imageable composition comprises a monomer, a binder and a photoinitiator system activatable by ultraviolet or visible radiation; and
imaging is carried out with ultraviolet or visible radiation; and
(B) developing the exposed imageable element and removing the unexposed regions to form the image.
17. The image of claim 16 in which
the initiator system is activatable by infrared radiation and imaging is carried out with infrared radiation.
18. An image useful as a lithographic printing plate prepared by a method comprising the steps of, in order:
(A) imaging an imageable element and forming an exposed imageable element comprising exposed and unexposed regions, the imageable element comprising, in order:
a support;
an underlayer; and
an imageable layer;
in which:
the imageable layer comprises a negative working imageable composition;
the underlayer comprises a photothermal conversion material;
the underlayer is soluble or dispersible in a developer;
the negative working imageable composition comprises a polymeric diazonium compound and a binder; and
(B) developing the exposed imageable element and removing the unexposed regions to form the image.
19. The image of claim 18 in which imaging is carried out with ultraviolet radiation.
20. The image of claim 18 in which imaging is carried out thermally.
21. The element of claim 1 in which the underlayer comprises a copolymer that comprises about 35 to about 60 mol % of N-phenylmaleimide, about 15 to about 40 mol % of methacrylamide, and about 10 to about 30 mol % of methacrylic acid.
22. The element of claim 3 in which
the underlayer comprises a copolymer that comprises about 35 to about 60 mol % of N-phenylmaleimide, about 15 to about 40 mol % of methacrylamide, and about 10 to about 30 mol % of methacrylic acid.
23. The element of claim 1 in which the photothermal conversion material is a dye that absorbs in the range of 750 nm to 1200 nm.
24. The method of claim 8 in which the photothermal conversion material is a dye that absorbs in the range of 750 nm to 1200 nm.
25. The method of claim 10 in which the photothermal conversion material is a dye that absorbs in the range of 750 nm to 1200 nm.
26. The method of claim 8 in which the underlayer comprises a copolymer that comprises about 35 to about 60 mol % of N-phenylmaleimide, about 15 to about 40 mol % of methacrylamide, and about 10 to about 30 mol % of methacrylic acid.
27. The method of claim 12 in which the underlayer comprises a copolymer that comprises about 35 to about 60 mol % of N-phenylmaleimide, about 15 to about 40 mol % of methacrylamide, and about 10 to about 30 mol % of methacrylic acid.