The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 1987
Filed:
Dec. 17, 1985
John P Winter, Appleton, WI (US);
Presto Products, Incorporated, Appleton, WI (US);
Abstract
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.