Process for producing a sliding layer on the surface of an aluminum-coated record carrier
AssigneeInternational Business Machines Corporation
InventorsDietrich J. Bahr, Marian Briska
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Abstract
To reduce scratches on the aluminum-covered front surface of a record carrier substrate having a back surface covered with a nitrocellulose lacquer, 0.1 to 2 percent by weight of a fatty acid, as referred to the weight of the wet lacquer, is added to the last applied layer of lacquer. When the record carrier is wound into a roll, the aluminum layer contacts and reacts with the fatty acid forming a sliding layer.
Claims3
A process for forming a record carrier having a sliding layer on an aluminum-coated front surface of a substrate having a nitrocellulose lacquer layer, said process comprising the steps of:
- (1) coating the back surface of the substrate with one or several nitrocellulose lacquer layers with from about 0.1 to 2% by weight, as referred to the wet lacquer, of one or several fatty acids being added to the last lacquer layer,
- (2) coating the front surface of the substrate with aluminum in a vacuum;
- (3) winding the record carrier into the form of a roll, whereby the aluminum layer is in contact with the fatty acid, and a sliding layer is formed by reaction between the aluminum layer and the fatty acid, and
- (4) aging the roll for at least one month.
Dependencies are inferred from the claim text.