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US 5,345,869 AGranted
Lithographic plate, and method for making, having an oxide layer derived from a type A sol
AssigneeAlcan International Limited
InventorsJohn A. Treverton, Jonathan Ball
Life of this patent
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Abstract
A lithographic plate comprising a substrate carrying an oxide layer derived from a Type A sol is disclosed. The substrate may be metal, e.g. aluminum or steel, and may be in a mill finished state or grained or otherwise profiled. Type A sols have polynuclear cations but no specific particles and may be formed by peptising basic salts with acids. The sol may include an inorganic passenger powder which may impart a desired topography to the coating layer.
Claims16
A lithographic plate comprising:
- a substrate;
- an oxide layer, said oxide layer directly overlying said substrate and being derived from a Type A sol which is itself derived from an inorganic precursor.
A method of making a lithographic plate, which method comprises:
- providing a substrate;
- applying to the substrate a composition comprising a Type A sol derived from an inorganic precursor and;
Dependencies are inferred from the claim text.