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US 4,542,089 AGranted
Lithographic substrate and its process of manufacture
AssigneeMinnesota Mining and Manufacturing Company
InventorsDonald E. Cadwell, Larry A. Brey
Life of this patent
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Abstract
Lithographic printing substrates ordinarily require a mechanical or chemical graining of aluminum surfaces. Such substrates are difficult and expensive to make. It has been found that lithographically suitable substrates can be prepared by the firing of monobasic phosphate solutions with dispersed particles therein. The presence of reactive metallic oxides enhances the properties of the surface.
Claims18
A process for preparing a photosensitive substrate comprising the steps of
- A. Providing a hydrophilic ceramic on an aluminum substrate or aluminized surface of a substrate which comprises applying a slurry of at least one monobasic phosphate and inorganic non-metallic particles on at least one surface of the aluminum or aluminized substrate and firing the slurry at a temperature of at least 230.degree. C. for a time sufficiently long to insure substantially complete dehydration of the ceramic layer to form a hydrophilic ceramic coating on said aluminum substrate or aluminized surface of a substrate;
- B. Coating on said ceramic layer an organic photosensitive lithographic layer.
Dependencies are inferred from the claim text.