Substrate for lithographic printing plate precursor
View Patent ↗Substrates for imageable elements are disclosed. The substrates comprise, in order, an aluminum or aluminum alloy support, a silicate layer, and a layer of interlayer material. The interlayer material is a co-polymer that comprise (1) phosphonic acid groups and/or phosphate groups and (2) acid groups and/or groups that comprise ethylene glycol or polyethylene glycol side chains. Imageable elements that comprise an imageable layer over the interlayer material are useful as lithographic printing plate precursors.
1. A co-polymer comprising K units and L units:
the K units are selected from —[CH 2 C(R 1 )C(O)(OCH 2 CH(R 5 )) m OR 2 ]—, —[CH 2 C(R 3 )CO 2 H]—, and mixtures thereof;
the L units are selected from —[CH 2 C(R 4 C(O)(OCH 2 CH(R 6 )) n OP(O)(OH) 2 ]—, —[CH 2 CH 2 PO(OH) 2 ]—, and mixtures thereof;
R 1 is hydrogen or methyl; R 2 is hydrogen or an alkyl group of one to four carbon atoms; R 3 is hydrogen or methyl; R 4 is hydrogen or methyl; and R 5 and R 6 are each independently hydrogen, methyl, or chloromethyl; m is 1 to about 30; and n is 1 to about 15; and
the co-polymer comprises about 50 wt % to 90 wt % of the K units and about 10 wt % to about 50 wt % of the L units.
2. The co-polymer of claim 1 in which:
the k units are selected from —[CH 2 C(R 1 C(O)(OCH 2 CH(R 5 )) m OR 2 ]—;
the L units are selected from —[CH 2 C(R 4 )C(O)(OCH 2 CH(R 6 )) n OP(O)(OH) 2 ]—; and
R 1 is methyl; R 2 is hydrogen or methyl; R 4 is methyl; R 5 is hydrogen; and R 6 is hydrogen.
3. The co-polymer of claim 2 in which the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units, m is 1 to about 15, and n is 1 to about 8.
4. A substrate comprising, in order, a support, a silicate layer, and an interlayer, in which:
the support comprises aluminum or an aluminum alloy;
the interlayer comprises an interlayer material;
the interlayer material is a co-polymer comprising K units and L units;
the K units are selected from —[CH 2 C(R 1 )C(O)(OCH 2 CH(R 5 )) m OR 2 ]—, and mixtures thereof;
the L units are selected from —[CH 2 C(R 4 )C(O)(OCH 2 CH(R 6 )) n OP(O)(OH) 2 ]—, and mixtures thereof;
R 1 is hydrogen or methyl; R 2 is hydrogen or an alkyl group of one to four carbon atoms; R 3 is hydrogen or methyl; R 4 is hydrogen or methyl; and R 5 and R 6 are each independently hydrogen, methyl, or chloromethyl; m is 1 to about 30; and n is 1 to about 15; and
the co-polymer comprises about 50 wt % to 90 wt % of the K units and about 10 wt % to about 50 wt % of the L units.
5. The substrate of claim 4 in which the K units comprise 55 wt % to 70 wt % of the co-polymer and the L units comprise about 30 wt % to 45 wt %, of the co-polymer.
6. The substrate of claim 4 in which R 1 is methyl; R 2 is hydrogen or methyl; R 4 is methyl; R 5 is hydrogen; and R 6 is hydrogen.
7. The substrate of claim 6 in which the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units.
8. The substrate of claim 7 in which m is 1 to about 15 and n is 1 to about 8.
9. An imageable element comprising:
a substrate comprising, in order, a support, a silicate layer, and an interlayer; and
an imageable layer over the interlayer;
in which:
the imageable layer comprises an imageable composition;
the support comprises aluminum or an aluminum alloy;
the interlayer comprises an interlayer material;
the interlayer material is a co-polymer comprising K units and L units:
the K units are selected from —[CH 2 C(R 1 )C(O)OCH 2 CH(R 5 )) m OR 2 ]—, and mixtures thereof;
the L units are selected from —[CH 2 C(R 4 )C(O)(OCH 2 CH(R 6 )) n OP(O)(OH) 2 ]—, and mixtures thereof;
R 1 is hydrogen or methyl; R 2 is hydrogen or an alkyl group of one to four carbon atoms; R 3 is hydrogen or methyl; R 4 is hydrogen or methyl; and R 5 and R 6 are each independently hydrogen, methyl, or chloromethyl; m is 1 to about 30; and n is 1 to about 15; and
the co-polymer comprises about 50 wt % to 90 wt % of the K units and about 10 wt % to about 50 wt % of the L units.
10. The imageable element of claim 9 in which the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units.
11. The imageable element of claim 9 in which: R 1 is methyl; R 2 is hydrogen or methyl; R 4 is methyl; R 5 is hydrogen; and R 6 is hydrogen.
12. The imageable element of claim 11 in which the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units.
13. The imageable element of claim 12 in which m is 1 to about 15 and n is 1 to about 8.
14. The imageable element of claim 9 in which the imageable composition is a negative working imageable composition that comprises a monomer and a free radical generating system.
15. The imageable element of claim 14 in which the imageable composition additionally comprises a binder.
16. The imageable element of claim 15 in which the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units.
17. The element of claim 16 in which the binder is a co-polymer that comprises polyethylene oxide side chains.
18. The imageable element of claim 9 in which:
R 1 is methyl; R 2 is hydrogen or methyl; R 4 is methyl; R 5 is hydrogen; and R 6 is hydrogen; and
m is 1 about 15 and n is 1 to about 8.
19. The imageable element of claim 9 in which the imageable layer comprises a polymeric diazo resin or a mixture of polymeric diazo resins.
20. The imageable element of claim 19 in which the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units.
21. The imageable element of claim 9 in which the imageable layer comprises a photothermal conversion material, an acid generator, an acid activatable crosslinking agent, and a polymeric binder.
22. The imageable element of claim 21 in which:
R 1 is methyl; R 2 is hydrogen or methyl; R 4 is methyl; R 5 is hydrogen; and R 6 is hydrogen; the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units; and
m is 1 to about 15 and n is 1 to about 8.
23. A method for forming an image, the method comprising the steps of:
providing an imageable element comprising:
a substrate comprising, in order, a support, a silicate layer, and an interlayer, and
an imageable layer over the interlayer;
thermally imaging the imageable element and forming an imaged imageable element comprising imaged regions and complementary unimaged regions in the imageable layer;
developing the imaged imageable element and removing one of the imaged regions and the unimaged regions;
in which:
the imageable layer comprises an imageable composition;
the support comprises aluminum or an aluminum alloy;
the interlayer comprises an interlayer material;
the interlayer material is a co-polymer comprising K units and L units;
the K units are selected from —[CH 2 C(R 1 )C(O)(OCH 2 CH(R 5 )) m OR 2 ]—, and mixtures thereof;
the L units are selected from
—[CH 2 C(R 4 )C(O)(OCH 2 CH(R 6 ) n OP(O)(OH) 2 ]—, and mixtures thereof;
R 1 is hydrogen or methyl; R 2 is hydrogen or an alkyl group of one to four carbon atoms; R 3 is hydrogen or methyl; R 4 is hydrogen or methyl; and R 5 and R 6 are each independently hydrogen, methyl, or chloromethyl; m is 1 to about 30; and n is 1 to about 15; and
the co-polymer comprises about 50 wt % to 90 wt % of the K units and about 10 wt % to about 50 wt % of the L units.
24. The method of claim 23 in which developing is carried out with ink and fountain solution.
25. The method of claim 24 in which the imageable composition is a negative working imageable composition that comprises a monomer and a free radical generating system, and developing removes the unimaged regions.
26. The method of claim 25 in which the imageable composition additionally comprises a binder.
27. The method of claim 26 in which:
R 1 is methyl; R 2 is hydrogen or methyl; R 4 is methyl; R 5 is hydrogen; and R 6 is hydrogen;
the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units; and
m is 1 to about 15 and n is 1 to about 8.
28. The method of claim 26 in which R 1 is methyl; R 2 is hydrogen or methyl; R 5 is hydrogen or methyl; the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units; and m is 1 to about 15 and n is 1 to about 8.
29. The method of claim 23 in which the imageable layer comprises a polymeric diazo resin or a mixture of polymeric diazo resins, and developing removes; the imaged regions.
30. The method of claim 29 in which:
R 1 is methyl; R 2 is hydrogen or methyl; R 4 is methyl; R 5 is hydrogen; and R 6 is hydrogen;
the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units; and
m is 1 about 15 and n is 1 to about 8.
31. The method of claim 29 in which in which R 1 is methyl; R 2 is hydrogen or methyl; R 5 is hydrogen or methyl; the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units; and m is 1 to about 15 and n is 1 to about 8.
32. The method of claim 23 in which the imageable layer comprises a photothermal conversion material, an acid generator, an acid activatable crosslinking agent, and a polymeric binder, and developing removes the unimaged regions.
33. The method of claim 32 in which:
R 1 methyl; R 2 is hydrogen or methyl; R 4 is methyl; R 5 is hydrogen; and R 6 is hydrogen; the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units; and is 1 to about 15 and n is 1 to about 8.
34. The method of claim 32 in which R 1 is methyl; R 2 is hydrogen or methyl; R 5 is hydrogen or methyl; the co-polymer comprises about 55 wt % to 70 wt % of the K units and about 30 wt % to about 45 wt % of the L units; and m is 1 to about 15 and n is 1 to about 8.
35. An imageable element comprising:
a substrate comprising, in order, a support, a silicate layer, and an interlayer; and
an imageable layer over the interlayer;
in which:
the imageable layer comprises an imageable composition;
the support comprises aluminum or an aluminum alloy;
the interlayer comprises an interlayer material;
the interlayer material is a co-polymer comprising K units and L units:
the K units are selected from —[CH 2 C(R 1 )C(O)(OCH 2 CH(R 5 )) m OR 2 ]—, —[CH 2 C(R 3 )CO 2 H]—, and mixtures thereof;
the L units are selected from —[CH 2 C(R 4 )C(O)(OCH 2 CH(R 6 ) n OP(O)(OH) 2 ]—, —[CH 2 CH 2 PO(OH) 2 ]—, and mixtures thereof;
R 1 is hydrogen or methyl; R 2 is hydrogen or an alkyl group of one to four carbon atoms; R 3 is hydrogen or methyl; R 4 is hydrogen or methyl; and R 5 and R 6 are each independently hydrogen, methyl, or chloromethyl; m is 1 to about 30; and n is 1 to about 15; and
the co-polymer comprises about 50 wt % to 90 wt % of the K units and about 10 wt % to about 50 wt % of the L units,
wherein said imageable element is on-press developable using a lithographic ink, fountain solution, or both.