Presto Products, Incorporated

The Coca-Cola Company

John P Winter

Mladomir Tomic

Multiple layer nonoriented heat sealable films are disclosed having a base substrate layer of poly(ethylene terephthalate) (polyester) or polyester copolymer and at least one heat sealable surface layer of a copolyester. The films are prepared by conventional cast or blown film coextrusion techniques.

Polyester/copolyester coextruded packaging film

A nonoriented, heat sealable, coextruded, moisture barrier film is disclosed. This film has a base layer ('A') of polypropylene homopolymer, polypropylene copolymer or combinations thereof, a heat sealant layer ('C') of polyester/copolyester or blends thereof and a tie layer ('B') of modified polyethylene homopolymer, modified polyethylene copolymer, modified polypropylene homopolymer, modified polypropylene copolymer, an unmodified polyethylene copolymer or combinations thereof between the base layer ('A') and the heat sealant layer ('C'). This film has three layers ('ABC') or five layers ('CBABC'). This film exhibits a very broad heat seal range and has a moisture vapor transmission rate of from about 0.20 to about 1.0 g/100in.sup.2 /24 hr. This film has a wide variety of applications as a packaging film including such demanding uses as the inside of a microwave popcorn bag. This film significantly improves the shelf life of microwave popcorn compared to conventional films used for this product. This film also exhibits excellent heat seal properties to itself as well as a wide variety of diverse substrates.

Polypropylene/polyester nonoriented heat sealable moisture barrier film

A nonoriented, heat sealable, coextruded, moisture barrier film is disclosed. This film has a base layer ('A') of polyethylene, preferably high density, a heat sealant layer ('C') of polyester/copolyester or blends thereof and a tie layer ('B') of modified polyethylene homopolymer, modified polyethylene copolymer, unmodified polyethylene copolymer or combinations thereof between the base layer ('A') and the heat sealant layer ('C'). This film has three layers ('ABC') or five layers ('CBABC'). This film exhibits a very broad heat seal range and has a moisture vapor transmission rate of from about 0.20 to about 1.0 g/100 in.sup.2 /24 hr. This film has a wide variety of applications as a packaging film including such demanding uses as the inside of a microwave popcorn bag. This film significantly improves the shelf life of microwave popcorn compared to conventional films used for this product. This film also exhibits excellent heat seal properties to itself as well as a wide variety of diverse substrates.

Polyethylene/polyester nonoriented heat sealable moisture barrier film

Bales of unvulcanized rubber, vulcanized rubber or compounding ingredients for unvulcanized rubber are packaged in film or bags made from syndiotactic 1,2-polybutadiene (1,2-SBD) containing at least one antiblock agent additive and at least one slip agent additive. Coextrusion can be used to manufacture bags or film having two or more layers where only the inside layer is heavily loaded with antiblock additives and the outside layer contains only a minimal amount of antiblock additives with both layers containing slip agents. The use of 1,2-SBD serves to eliminate the problems of incompatibility and disposal encountered in the prior art and provides film and bags having superior puncture and tear resistance when compared to a conventional material such as polyethylene.

Growing community of inventors

Appleton, WI, United States of America

John P Winter