Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1990-03-16
1992-07-07
Van Balen, William J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
4283171, 4283186, 4283193, 4283197, B32B 326
Patent
active
051281961
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.
REFERENCES:
patent: 3206354 (1965-09-01), Pooley
patent: 4128695 (1978-12-01), Kikuchi et al.
Luetkens, Jr. Melvin L.
Pischke Robert D.
Schubert John C.
Amoco Corporation
Magidson William H.
Murray William E.
Sroka Frank J.
Van Balen William J.
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