Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1987-07-27
1991-04-30
Buffalow, Edith
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428212, 428349, 428516, 428517, 428521, B29D 2200
Patent
active
050117190
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.
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Manufacturer's (Shell Chemical Company) literature, undated, regarding Kraton.RTM. polymers, which include SEBS.
Gehrke Russell P.
Johnson, Jr. Richard E.
Kim Yong J.
American National Can Company
Audet Paul R.
Buffalow Edith
Stenzel Robert A.
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