Patent Number: 6,251,974

Title: Polyamide release film for use in the production of molded composite products

Abstract: A film for adhering to a molding compound paste composite during its manufacture, said film being formed from a blend of a film forming polyamide resin and at least one release agent material selected from the group consisting of N, N' ethylene bis amides of the formula: wherein R.sub.1 is an aliphatic hydrocarbon chain of about 14 to about 42 carbon atoms, and R.sub.2 is a hydrogen atom or an aliphatic hydrocarbon chain of about 14 to about 42 carbon atoms; calcium stearate; a mixture of calcium stearate and silicone; a mixture of calcium stearate and polytetraflurorethylene; polypropylene; modified polypropylene; waxes; fluoroelastomers; silicones; molybdenum disulphide; boron nitride; N, N' ethylene bis stearamide and polytetrafluoroethylene; N, N' ethylene bis stearamide and silicone; N, N' ethylene bis stearamide and graphite; N, N' ethylene bis stearamide and polypropylene; N, N' ethylene bis stearamide and molybdenum disulphide; waxes and polytetrafluoroethylene; waxes and silicone; polytetrafluoroethylene and silicone; polytetrafluoroethylene and maleic anhydride modified polypropylene; silicone and graphite; silicone maleic anhydride modified polypropylene; calcium stearate and molybdenum disulphide; calcium stearate and boron nitride; calcium stearate and polytetrafluoroethylene; calcium stearate and graphite; waxes and maleic anhydride modified polypropylene; polytetrafluoroethylene and graphite; polytetrafluoroethylene, silicone, graphite and molybdenum disulphide or boron nitride; and molybdenum disulphide and boron nitride, with the proviso that any modified polypropylene present does not exceed 3% by weight and wherein the release agent material is present in an amount such that after the paste composite is formed, substantially all of the film can be removed from the surface of the composite.

Inventors: Rossi; Sharon Anne (Whitby, CA), Vogt; Oliver Harold (Whitby, CA)

Assignee: E. I. du Pont de Nemours and Company

International Classification: B29C 37/00 (20060101); B29C 70/04 (20060101); B29C 70/50 (20060101); C08J 5/18 (20060101); C08K 5/00 (20060101); C08K 5/20 (20060101); C08L 077/00 ()

Expiration Date: 06/26/2018