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Reconstituted polymeric materials derived from post-consumer waste, industrial scrap and virgin resins made by solid state pulverization

United States Patent

5,814,673
September 29, 1998
View the Complete Patent at the US Patent & Trademark Office
A method of making polymeric particulates wherein polymeric scrap material, virgin polymeric material and mixtures thereof are supplied to intermeshing extruder screws which are rotated to transport the polymeric material along their length and subject the polymeric material to solid state shear pulverization and in-situ polymer compatibilization, if two or more incompatible polymers are present. Uniform pulverized particulates are produced without addition of a compatibilizing agent. The pulverized particulates are directly melt processable (as powder feedstock) and surprisingly yield a substantially homogeneous light color product.
Khait; Klementina (Skokie, IL)
Northwestern University (Evanston, IL)
08/ 639,344
April 26, 1996
CONTRACTUAL ORIGIN OF THE INVENTION This invention was made with Government support under Grant No. DE-FG 51-92 R 020215 awarded by the U.S. Department of Energy, Innovative Concepts Program, 392240.