Increased regrind usage in coextruded structures

Details Increased regrind usage in coextruded structures Increased regrind usage in coextruded structures

1988-01-28

1990-01-16

Buffalow, Edith

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428520, 428522, 15624411, B32B 2708

Patent

active

048942910

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 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
patent: 4781954 (1988-11-01), Krishnakumar
Chang Dae Han, "Multiphase Flow in Polymer Processing", published in 1981 by Academic Press, pp. 341-449.
Ed Galli, "Coextrusion: New Layers of Technology", published Jan. 1988 by PM&E, pp. 36-38.
Dragan Djordjevic, "Coextrusion with Barrier Scrap--Problems and Solutions", presented at the Society of Plastics Engineers Regional Conference on Oct. 5-7, 1987.

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