Claims
- 1. A lithographic printing member directly imageable by laser discharge, the member comprising:
- a. a topmost first layer which is polymeric; and
- b. a thin metal layer underlying the first layer; and
- c. a substrate underlying the metal layer; wherein
- d. the metal layer is formed of a material which is subject to ablative absorption of imaging infrared radiation and the first layer is not; and
- e. the first layer and the substrate exhibit different affinities for at least one printing liquid selected from the group consisting of ink and an abhesive fluid for ink.
- 2. The member of claim 1 wherein the metal is tintanium.
- 3. The member of claim 1 wherein the metal is selected from the group consisting of alloys of titanium, aluminum, alloys of aluminum, nickel, iron and chromium.
- 4. The member of claim 1 wherein the metal is deposited to a thickness of less than 200 .ANG..
- 5. The member of claim 1 wherein the metal is deposited to an optical density ranging from 0.2 to 1.0.
- 6. The member of claim 1 wherein the metal is deposited to an optical density of 2.5 or less.
- 7. The member of claim 1 wherein the first layer is oleophobic.
- 8. The member of claim 7 wherein the first layer is a silicone chemical species.
- 9. The member of claim 8 wherein the silicone is anchored to the metal layer by means of a silane adhesion promoter.
- 10. The member of claim 1 wherein the first layer is hydrophobic.
- 11. The member of claim 10 wherein the first layer is a polyvinyl alcohol chemical species.
- 12. The member of claim 11 wherein the polyvinyl alcohol is anchored to the metal layer by means of a titanate adhesion promoter.
- 13. The member of claim 1 wherein the first layer is anchored to the metal layer by means of an adhesion promoter.
- 14. The member of claim 1 wherein the substrate comprises first and second surfaces, at least one of which has means to improve adhesion.
- 15. The member of claim 1 wherein the substrate comprises first and second surfaces, at least one of which has means to reduce static buildup.
- 16. The member of claim 1 wherein the substrate comprises first and second surfaces, the first has means to improve adhesion and the second surface has means to reduce static buildup.
- 17. The member of claim 1 further comprising an antireflective layer between the metal and first layers.
- 18. The member of claim 1 wherein the substrate is laminated to a metal support.
RELATED APPLICATION
This is a continuation-in-part of Ser. No. 08/062,431, filed on May 13, 1993, now U.S. Pat. No. 5,339,737 which is itself a continuation-in-part of Ser. No. 07/917,481, filed on Jul. 20, 1992, now abandoned.
US Referenced Citations (66)
Foreign Referenced Citations (7)
Number |
Date |
Country |
3714157 |
Nov 1988 |
DEX |
2-35789 |
Sep 1990 |
JPX |
3-197190 |
Aug 1991 |
JPX |
3-197191 |
Aug 1991 |
JPX |
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Aug 1991 |
JPX |
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Jan 1993 |
JPX |
9207716 |
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WOX |
Non-Patent Literature Citations (3)
Entry |
Molecular and Dynamic Studies on Lase Abalation of Doped Polymer Systems, 17 Polymer News (1991). |
E. B. Cargill et al., A Report On Polaroid's New Dry Imaging Technology for Generating 8.times.10 Radiographic Films (Jan. 1993). |
E. B. Cargill et al., A Report On The Image Quality Characteristics of the Polaroid Helios Laser System (Oct. 1992). |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
62431 |
May 1993 |
|
Parent |
917481 |
Jul 1992 |
|