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Title:
MULTI-LAYER STAIN AND HEAT RESISTANT PLASTIC CONTAINER FOR STORING AND HEATING FOOD; METHOD OF MAKING THE SAME
Document Type and Number:
WIPO Patent Application WO2002094560
Kind Code:
B1
Abstract:
A three-dimensional, multi-layer plastic product that is resistant to damage caused by environmental factors such as heat, chemicals, desiccants, oxygen, and/or weather is disclosed. The multi-layer product includes an engineering resin layer affixed to a commodity resin layer. The engineering resin layer of the multi-layer film may be directly fused to the commodity resin or post-consumer regrind layer. Alternatively, the engineering resin layer may be tied to the commodity resin or post-consumer regrind layer through the use of one or more adhesive and/or tie layers. The commodity resin layer may be manufactured from an economical polymer material such as a polypropylene, polyethylene, polystyrene or post-consumer regrind. Suitable engineering resins may be any of a variety of suitable materials such as a polysulphone, polymethylpentene, polyester, polycarbonate, polyetherimide, nylon, polyarylate, polyphenylenesulphide, polyphenylene oxide, polyethersulphone, aromatic polyketone, liquid crystal polymer, and mixtures thereof, for example, a method for manufacturing a three-dimensional multi-layer plastic product is also disclosed which includes the steps of providing an extruded or laminated sheet comprising an engineering resin layer, thermoforming a three-dimensional shell from the sheet, an injection molding a commodity resin layer onto the thermoformed shell.

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Inventors:
MITTEN MICHAEL R
SAPATOVA ELENA Y
TRAVERS JOHN F
FLOYD GREGORY S
Application Number:
PCT/US2002/016744
Publication Date:
April 08, 2004
Filing Date:
May 23, 2002
Export Citation:
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Assignee:
RUBBERMAID INC (US)
International Classes:
A47J36/02; B29C45/14; B29C49/00; B29C51/00; B32B1/02; B32B7/02; B32B7/022; B32B7/027; B32B27/08; B29C41/04; B29C49/22; B29C51/14; B29C69/02; B65D81/34; (IPC1-7): B32B27/00; A47J36/02
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