B - Operations – Transporting – 29 – B
Patent
B - Operations, Transporting
29
B
B29B 9/06 (2006.01) B29C 47/38 (2006.01)
Patent
CA 2078500
ABSTRACT This invention discloses an improved method for powder PVC extrusion using particulate PVC resin specified herein which enables smooth, dull surfacesfor extrudates under broad processing conditions, in particular at relatively lower shear and temperature. The resins are characterized as having an average particle size ranging from 50 to 125 microns, a DOP porosity of from about 0.27 cc/gm to about 0.5 cc/gm, and a friability rating of 5 or less, preferably 2 or less depending on the stock temperature range during extrusion.
Geon Company
Hawrylko Roman B.
Swabey Ogilvy Renault
The B.f. Goodrich Company
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