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US 4,510,199 AGranted
Release sheets for laminates with wax and alginate salt release layer
AssigneeWestinghouse Electric Corp.
InventorLenon G. Brooker
Life of this patent
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Abstract
A release sheet useful in laminating assemblies is made and contains a thermosetting resin impregnated fibrous core layer, release coated on at least one side with a mixture of wax and alginate salt, where the solids weight ratio of (wax):(alginate salt) in the coating is from about (3 to 15):(1).
Claims10
A release sheet useful in laminating assemblies comprising:
- (A) a thermosetting resin impregnated fibrous core layer, and
- (B) a release coating on at least one side of the core layer, the release coating consisting essentially of a mixture of wax and alginate salt, where the solids weight ratio of (wax):(alginate salt) in the coating is from about (3 to 15):(1).
A method of making a release sheet comprising the steps of:
- (A) impregnating a fibrous sheet with thermosetting resin, and
- (B) coating at least one side of the resin impregnated fibrous sheet with a mixture consisting essentially of a dispersion of wax and alginate salt, where the solids ratio of (wax):(alginate salt) is from about (3 to 15):(1), the mixture has a viscosity of from about 100 cps. to 1,500 cps. at 25.degree. C., and the range of wax solids plus alginate salt solids is from about 1 wt.% to about 5 wt.% of the weight of the unimpregnated fibrous core layer.
Dependencies are inferred from the claim text.