Coated sheet method
AssigneeA*Ware Technologies, L.C.
InventorsDerric T. Overcash, Ronald L. Elsenbaumer
Life of this patent
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Abstract
A coated sheet material made by: (a) coating a porous substrate sheet material with a barrier coating composition comprising (i) a cross-linkable polymer resistant to penetration by water moisture, and (ii) a water-dispersible film-forming polymer that is resistant to penetration by grease and oil, said barrier coating composition forming a barrier layer on said substrate sheet material; and (b) coating said barrier layer with a release coating composition. The coated sheet material is useful in forming articles and food wrappers for use in conventional or microwave ovens. The invention includes methods of making articles from the coated sheet materials.
Claims33
A method of making a coated sheet material, said method comprising the steps of:
- (a) coating one surface of a porous substrate sheet material having at least two oppositely disposed surfaces, with a barrier coating formed from a dispersion comprised of a mixture of:
- (i) a cross-linkable first polymer that is resistant to penetration by water moisture when cured, and (ii) a water-dispersible, film-forming second polymer that is resistant to penetration by grease and oil when cured, wherein said first and second polymers are different, said barrier coating composition forming a barrier layer on said substrate sheet material;
- and
- (b) coating said barrier layer with a release coating composition, said release coating composition forming a release layer on said barrier layer.
A method of making a shaped article that is ovenable in a conventional oven at temperatures of about 400° F., said method comprising the steps of:
- (a) coating one surface of a porous substrate sheet material having at least two oppositely disposed surfaces, with a barrier coating formed from a dispersion comprised of a mixture of:
- (i) a cross-linkable first polymer that is resistant to penetration by water moisture when cured, and (ii) a water-dispersible, film-forming second polymer that is resistant to penetration by grease and oil when cured, wherein said first and second polymers are different, said barrier coating composition forming a barrier layer on said substrate sheet material;
- (b) coating said barrier layer with a release coating composition, said release coating composition forming a release layer on said barrier layer;
- and
- (c) forming said substrate sheet material into a shaped article.
A method of protecting a food-contacting surface from penetration by grease, oil, and water, wherein said method comprises the steps of:
- (a) coating said surface with a barrier coating formed from a dispersion comprised of a mixture of:
- (i) a cross-linkable first polymer resistant to penetration by water moisture when cured, and (ii) a water-dispersible, film-forming second polymer resistant to penetration by grease and oil when cured, wherein said first and second polymers are different, said barrier coating composition forming a barrier layer on said surface;
- and
- (b) coating said barrier layer with a release coating composition, said release coating composition forming a release layer on said barrier layer.
A method of making an ovenable coated sheet material, said method comprising the steps of:
- (a) casting a polymer barrier coating onto a surface of a carrier, said polymer barrier coating comprising two polymers, said surface being substantially non-porous and non-adherent;
- (b) partially curing the combined polymer barrier coating and said carrier to form said polymer barrier coating into a partially cured barrier film coating on the surface of the carrier;
- and
- (c) transferring the barrier film coating from the carrier onto a surface of the sheet material by pressure rolling the combined barrier film coating and carrier onto the surface of the sheet material and subsequently removing the carrier from the barrier film coating said sheet material comprising a material ovenable in a microwave oven and able to withstand temperatures of at least 300 degrees.
Dependencies are inferred from the claim text.