Claims
- 1. A lithographic plate that is transformable so as to change the affinity of said plate for ink, said plate being a layered structure including an ink-receptive substrate, a conductive layer and an ink-repellent coating, said coating containing a dispersion of particles consisting essentially of at least one conditionally conductive oxide compound that includes at least one octahedrally coordinated metal species, at least a fraction of such metal species containing at least one valence electron.
- 2. The plate of claim 1 wherein all of said octahedrally coordinated metal species contain at least one valence electron.
- 3. The plate of claim 1 wherein said at least some fraction of at least one metal species is present in an oxidation state above a thermodynamically favored state.
- 4. The plate of claim 1 wherein the compound has a rutile structure.
- 5. The plate of claim 4 wherein the rutile structure is defective.
- 6. The plate of claim 4 wherein the rutile structure is intergrown with another structure.
- 7. The plate of claim 1 wherein the compound has a perovskite structure.
- 8. The plate of claim 7 wherein the perovskite structure is defective.
- 9. The plate of claim 7 wherein the perovskite structure is intergrown with another structure.
- 10. The plate of claim 1 wherein the compound has a spinel structure.
- 11. The plate of claim 10 wherein the spinel structure is defective.
- 12. The plate of claim 10 wherein the spinel structure is intergrown with another structure.
- 13. The plate of claim 1 wherein the compound is a bronze-composition oxide.
- 14. The plate of claim 13 wherein the compound is of the formula A.sub.y MO.sub.3 and wherein:
- a. A is selected from the group consisting of Na, K, Sn, Sb, Bi, and the elements of Group II of the periodic table;
- b. M is selected from the group consisting of W, Mo, Ti, V, Nb, Ta, Mn, Re, Ru, Ir, and Pt; and
- c. 0<y<3.
- 15. The plate of claim 13 wherein the compound is of the formula
- M.sub.x M'.sub.y M".sub.x O.sub.3
- and wherein:
- a. M represents at least one element of Group I or Group II of the periodic table;
- b. 0<x<1.0;
- c. M' and M" are selected from the group consisting of W, Mo, Ti, V, Nb, Ta, Mn, Re, Ru, Ir, and Pt; and
- d. y+z=1.0.
- 16. The plate of claim 1 further comprising at least one dopant.
- 17. The plate of claim 1 wherein the compound is disposed as a thin layer around a hollow-core particle.
- 18. The plate of claim 17 wherein the compound further comprises at least one dopant.
- 19. The plate of claim 1 wherein at least one compound is a transition-metal oxide having a rutile crystal structure and wherein at least one metal species exhibits an oxidation state of +4 and retains at least one valence electron.
- 20. The plate of claim 1 wherein at least one compound is a mixed-metal rutile compound of formula
- M.sub.1-x M'.sub.x O.sub.2
- and wherein:
- a. M is selected from the group consisting of Ti, V, Nb, Ta, Cr, Mo, W, Re, Ru, Ir, Sn, and Pb;
- b. M' denotes one or more additional metals selected from the group consisting of Fe, Co, Ni, In, Sn, Pb, Sb, Bi, and any of the metals listed for M; and
- c. 0x<0.5.
- 21. The plate of claim 1 wherein at least one compound is a spinel compound containing a plurality of metal species that undergo valence oscillation with one another.
- 22. The plate of claim 21 wherein the plurality of metal species comprises the same element in a plurality of oxidation states.
- 23. The plate of claim 1 wherein at least one compound is a perovskite-structured oxide selected from the group consisting BaTiO.sub.3, PbTiO.sub.3, LaCoO.sub.3, and LaNiO.sub.3.
- 24. The plate of claim 1 wherein the compound is a mixed-metal oxide of the formula
- A'.sub.1-x A".sub.x BO.sub.3
- and wherein:
- a. A' is a lanthanide;
- b. A" is selected from the group consisting of Ca, Sr, and Ba;
- c. B is selected from the group consisting of Cr, Mn, Fe, Co, and Ni; and
- d. 0.ltoreq.x.ltoreq.0.5.
- 25. The plate of claim 1 wherein the compound is a mixed-metal oxide of the formula
- AB'.sub.1-x B".sub.x O.sub.3
- and wherein:
- a. A is a lanthanide;
- b. B' is selected from the group consisting of Cr, Mn, Fe, Co and Ni;
- c. B" is a transition metal; and
- d. 0.ltoreq.x.ltoreq.0.5.
- 26. The plate of claim 1 wherein the compound is a mixed-metal oxide of the formula
- A'.sub.1-x A".sub.x B'.sub.1-y B".sub.y O.sub.3
- and wherein:
- a. A' is selected from the group consisting of Na, K, Ca, Sr, Ba, Y, and lanthanides;
- b. A" differs from A' and is selected from the group consisting of Mg, Zn, Cd, Pb and any of the metals listed for A';
- c. 0<x<0.5;
- d. B' is selected from the group consisting of Nb, Cr, Mn, Fe, Co, and Ni;
- e. B" differs from B' and is a transition metal or Mg; and
- f. 0.ltoreq.y.ltoreq.0.5.
- 27. The plate of claim 1 wherein the compound is a mixed-metal oxide of the formula
- APb.sub.1-x B.sub.x O.sub.3
- and wherein:
- a. A is selected from the group consisting of Ca, Sr, and Ba;
- b. B is Sb or Bi;
- c. 0<x<0.35 if B is Bi; and
- d. 0.2<x<0.35 is B is Sb.
RELATED APPLICATIONS
This is a continuation-in-part of Ser. No. 07/661,526, now U.S. Pat. No. 5,165,345 which is itself a continuation-in-part of Ser. No. 07/442,317, now U.S. Pat. No. 5,109,771, which is itself a continuation of Ser. No. 07/234,475, now U.S. Pat. No. 4,911,075. The entire disclosures of all of the foregoing documents are hereby incorporated by reference.
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
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30786 |
Feb 1989 |
JPX |
Continuations (1)
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Date |
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234475 |
Aug 1988 |
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Continuation in Parts (2)
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661526 |
Feb 1991 |
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Parent |
442317 |
Nov 1989 |
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