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US 6,231,942 B1Granted
Method and apparatus for microcellular polypropylene extrusion, and polypropylene articles produced thereby
AssigneeTrexel, Inc.
InventorsKent Blizard, Srinath Tupil, William Malavich
Life of this patent
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Abstract
A polymeric foam article is comprised mainly of homopolymeric polypropylene, or unimodal polypropylene. The polymeric article can be microcellular, and can be formed into a drinking straw.
Claims25
An article comprising foamed polymeric material including at least about 80% by weight polypropylene having a unimodal molecular weight distribution, and an average cell size of less than about 100 microns.
Dependencies are inferred from the claim text.