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:
Apr. 30, 1991
Filed:
Jul. 27, 1987
Russell P Gehrke, Neenah, WI (US);
Richard E Johnson, Jr, Appleton, WI (US);
Yong J Kim, Neenah, WI (US);
American National Can Company, Chicago, IL (US);
Abstract
Multiple layer films, and novel polymer compositions, for use in packaging sterile medical products and shelf stable foods. The films include at least two layers of modified polypropylene-based compositions, and optionally a third layer of polypropylene-based composition. The two layers of the film comprise polypropylene polymers having melting point temperatures, differing by at least 3.degree. C., with corresponding ethylene contents disparate by at least 1 weight percent ethylene. In 2-layer films, the compositions include ethylene butene-1 copolymer in both layers, and optionally an elastomer in either or both layers. Three and four layer films are set forth wherein outer polypropylene based layers protect the inner layers, as of the two layer composition, from bonding to corresponding portions of adjacent like layers. The films can be fabricated into packages formed as by heat sealing.