Method and apparatus for microcellular polypropylene extrusion, and polypropylene articles produced thereby
OwnerKent Blizard, Srinath Tupil +1inventors
InventorsKent Blizard, Srinath Tupil, William Malavich
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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.
Claims42
An article comprising foamed microcellular polypropylene having an average cell size less than about 100 microns.
An article comprising foamed polymeric material including at least about 80% by weight polypropylene having a unimodal molecular weight distribution.
An article comprising foamed polymeric material including at least about 80% by weight homopolymeric polypropylene of viscosity of at least about 2.5×103 poise.
An article comprising foamed polymeric material consisting essentially of homopolymeric polypropylene of viscosity of at least about 2.5×103 poise.
An article comprising foamed polymeric material consisting of homopolymeric polypropylene of viscosity of at least about 2.5×103 poise.
An article comprising polymeric material including at least about 80% by weight polypropylene having a unimodal molecular weight distribution and viscosity of at least about 2.5×103 poise.
An article comprising a foam polymeric drinking straw.
An article comprising a foamed polymeric tubular article having a length-to-diameter ratio of at least 10 and a wall thickness of no more than about 1.0 mm.
An article comprising a foamed polymeric tubular article having a diameter-to-thickness ratio of from about 9:1 to about 50:1.
Dependencies are inferred from the claim text.