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:
Jul. 07, 1992
Filed:
Mar. 16, 1990
Melvin L Luetkens, Jr, Batavia, IL (US);
Robert D Pischke, Duluth, GA (US);
John C Schubert, Marietta, GA (US);
Amoco Corporation, Chicago, IL (US);
Abstract
The invention comprises a multi-layer thermoplastic foam sheet comprising a thermoplastic foam layer adjacent to at least one multi-resin layer, preferably comprising a reclaim material mixture recycled from the sheet manufacturing process, and which comprises a thermoplastic barrier resin. In a preferred embodiment, the multi-layer sheet of the invention comprises a four major layer sheet comprising a barrier film layer which comprises a thermoplastic oxygen barrier resin; an inner mutli-resin reclaim layer comprising the oxygen barrier resin used in the barrier film layer; a foam core layer adjacent to the inner multi-resin reclaim layer; and an outer multi-resin reclaim layer, also comprising the oxygen barrier resin, as the other outer layer of the multi-layer sheet. In a more preferred embodiment, impact polystyrene is added to the reclaim layers and polystyrene is used in the foam core to produce multi-layer sheets having an impact-resisting outer layer and a lightweight inner foam core layer, respectively.