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US 4,375,486 AGranted
Process of making a dielectric product
AssigneeLudlow Corporation
InventorPhilip J. Clough
Life of this patent
Estimating the term…
Abstract
An improved dielectric printing paper and process for making the same, characterized by excellent resolution, contrast, and feel. The paper incorporates an inorganic salt such as magnesium chloride as a conductivity-providing ingredient. The dielectric coating is formed with a high loading of inorganic fillers and is applied by a dry process to form a discontinuous dielectric coating on the conductive paper substrate.
Claims6
A process for making a dielectric paper sheet of the type useful in dielectric printing processes and having a dielectric coating over a paper substrate, said process comprising
- (1) coating one side of said substrate, without the use of vaporizable liquid carrier vehicle, with a thermoplastic dielectric coating material consisting essentially of at least 40% of inorganic dielectric filler, by weight, suspended therein and a thermoplastic matrix for said filler;
- (2) impregnating said paper substrate with an inorganic salt humectant which, at relative humidities of from 20 to 70% at 25.degree. C., imparts electroconductivity to said substrate, and
- (3) solidifying such coating material on said substrate, thereby forming a discontinuous coating, with no substantial impregnation of said coating into said substrate, thereby obtaining excellent electrical and mechanical definition between said substrate and said coating.
Dependencies are inferred from the claim text.