Substrate with multi-layer nonstick coating
AssigneeE. I. Du Pont de Nemours and Company
InventorJacques M. L. Berghmans
Life of this patent
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Abstract
A three-coat system for use on bakeware which has a silvery appearance and can be cured at low temperatures. First, an epoxide-formaldehyde-nitrogen resin primer, which may contain aluminum flake, is applied to the substrate, then a reactive silicone-epoxy coat containing talc and coarse aluminum flake is applied. Finally, a less reactive silicone resin containing coarse aluminum flake, but no other pigment is applied. The two final coats are applied directly on the preceding coat after only ambient temperature air drying. After the final coat is applied, the coated article is baked at temperatures that need not exceed 275.degree. C.
Claims6
An article suitable for use as bakeware comprising a heat-resistant substrate coated with a multi-layered coating comprising:
- a primer coat comprising an epoxide-formaldehyde-nitrogen resin and optionally aluminum flake,
- an intermediate coat comprising a polymethylphenylsiloxane resin derived from a cross-linkable precondensate having a silicon-bonded hydroxyl content of at least about 3%, based on the weight of the precondensate, an epoxy resin, talc, and aluminum flake, and
- a topcoat consisting essentially of a polymethylphenylsiloxane resin derived from a cross-linkable precondensate having a silicon-bonded hydroxyl content of about 2 to 4%, based on the weight of the precondensate, and aluminum flake.
Dependencies are inferred from the claim text.