Increased regrind use in coextruded structures

Details Increased regrind use in coextruded structures Increased regrind use in coextruded structures

1990-09-21

1991-03-12

Buffalow, Edith

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428517, 428516, 4289033, 15624411, B32B 2709

Patent

active

049992546

ABSTRACT:
A laminate, a method for making the laminate and articles formed from the laminate are disclosed. The laminate comprises an outer layer, an optional adhesive layer, an inner layer, an intermediate regrind layer formed of a blend of the materials from which the other layers are formed, and, interposed between the outer layer and the intermediate regrind layer, there is a buffer layer which is formed from a blend of the materials from which the outer layer and the intermediate regrind layer are formed and which comprises at least about 5% of the material of the intermediate regrind layer. The outer layer is preferably polypropylene and the inner layer is preferably an ethylene vinyl alcohol copolymer.

REFERENCES:
patent: 4605576 (1986-08-01), Jabarin
patent: 4629596 (1986-12-01), Coffman
patent: 4705708 (1987-11-01), Briggs et al.
patent: 4781954 (1988-11-01), Krishnakumar et al.
"Multiphase Flow in Polymer Processing", by Chang Dae Han, published in 1981 by the Academic Press.
"Coextrusion: New Layers of Technology", by Ed Galli, published in PM&E in Jan. 1988.
"Coextrusion with Barrier Scrap-Problems and Solutions", by Dragon Djordjevic, presented at the Soc. of Plastics Eng. on 10/5-7/87.

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