Claims
- 1. A lithographic printing member directly imageable by laser discharge, the member comprising:
- a. a first durable, solid organic polymer layer that is oleophobic or hydrophilic;
- b. a solid oleophilic substrate underlying the first layer; and
- c. an imaging-radiation-reflective layer disposed between the first layer and the substrate;
- wherein
- d. the first layer is characterized by ablative absorption of imaging radiation and the substrate is not.
- 2. The member of claim 1 wherein the first layer is a silicone coating.
- 3. The member of claim 2 wherein the silicone layer includes a dispersion of particles that absorb infrared radiation.
- 4. The member of claim 3 wherein the particles are selected from the group consisting of borides, carbides, nitrides, carbonitrides, bronze-structured oxides, and oxides structurally related to the bronze family but lacking the A metal ion.
- 5. The member of claim 3 wherein the particles comprise at least one organic pigment.
- 6. The member of claim 2 wherein the silicone layer includes a dye that absorbs infrared radiation.
- 7. The member of claim 1 wherein the reflective layer is metal.
- 8. The member of claim 7 wherein the metal is aluminum that reflects at least 99% of incident IR radiation.
- 9. The member of claim 1 wherein the reflective layer contains a pigment that reflects IR radiation.
- 10. The member of claim 1 further comprising an adhesion-promoting layer disposed between the first layer and the substrate.
- 11. The member of claim 10 wherein the substrate is a polyester film and the substrate and the adhesion-promoting layer together are a print- or coatability-treated polyester film.
- 12. The member of claim 10 wherein the imaging-radiation-reflective layer is disposed between the first layer and the adhesion-promoting layer.
- 13. The member of claim 12 wherein the reflective layer is metal.
- 14. The member of claim 13 wherein the metal is aluminum that reflects at least 99% of incident IR radiation.
- 15. The member of claim 12 wherein the reflective layer contains a pigment that reflects IR radiation.
- 16. The member of claim 1 wherein the substrate is a polyester film.
- 17. The member of claim 16 wherein the film has a thickness ranging from 0.004 to 0.02 inch.
- 18. The member of claim 1 wherein the first layer includes a dispersion of particles that absorb imaging radiation.
- 19. The member of claim 18 wherein the particles are conductive carbon black.
- 20. A lithographic printing member directly imageable by laser discharge, the member comprising:
- a. a first durable, solid organic polymer layer that is oleophobic or hydrophilic; and
- b. a solid oleophilic substrate underlying the first layer;
- wherein
- c. the substrate comprises means for reflecting imaging radiation.
- 21. The member of claim 20 further comprising a layer of IR-absorptive metal oxide disposed above the substrate.
- 22. The member of claim 21 wherein the material of the metal-oxide layer is selected from the group consisting of titanium oxide, vanadium oxide, manganese oxide, iron oxide and cobalt oxide.
- 23. The member of claim 20 wherein the means for reflecting imaging radiation is a dispersed pigment.
- 24. A lithographic printing member directly imageable by laser discharge, the member comprising:
- a. a first durable, solid organic polymer layer that is hydrophilic; and
- b. a solid oleophilic substrate underlying the first layer;
- wherein
- c. the substrate is polished aluminum.
- 25. The member of claim 24 wherein the substrate has a thickness ranging from 0.004 to 0.02 inch.
- 26. A lithographic printing member directly imageable by laser discharge, the member comprising:
- a. a first durable, solid organic polymer layer that is oleophobic or hydrophilic; and
- b. a solid oleophilic substrate underlying the first layer;
- wherein
- c. the first layer includes an infrared-absorptive chromophore chemically integral with the polymer.
RELATED APPLICATION
This is a division of U.S. application Ser. No. 08/062,431, filed May 13, 1993 and now U.S. Pat. No. 5,339,737, which is itself a continuation-in-part of Ser. No. 07/917,481, filed Jul. 20, 1992, now U.S. Pat. No. 5,385,092.
US Referenced Citations (11)
Foreign Referenced Citations (6)
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Date |
Country |
160396 |
Nov 1985 |
EPX |
235789 |
Sep 1990 |
JPX |
3197190 |
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JPX |
3197191 |
Aug 1991 |
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Non-Patent Literature Citations (3)
Entry |
"Lasers in Platemaking", Graphic Arts Monthly, Dec. 1975, Dr. Albert R. Materazzi, pp. 70-73. |
Nechiporenko et al., "Direct Method of Producing Waterless Offset Plates by Controlled Laser Beam", USSR Research Institute for Complex Problems in Graphic Arts, pp. 139-148. |
Research Disclosure, Apr. 1980, at p. 131, "Method and Material for the Production of a Dry Planographic Plate", Leenders et al. |
Divisions (1)
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Number |
Date |
Country |
Parent |
62431 |
May 1993 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
917481 |
Jul 1992 |
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