Claims
- 1. In a method for the preparation of pelletized PVC compound from powder, comprising the steps of mixing a polyvinyl chloride resin to form a powder blend and extruding said blend, the improvement comprising employing a PVC resin having a weight average particle size in a range of from 50 microns to 125 microns, a DOP porosity in a range of from about 0.27 cc per gram (cc/gm) of said resin to 0.50 cc/gm, and a resin friability rating of from 0 to 5 and extruding said compound to form pellets at a stock temperature of from about 315.degree. F. to about 350.degree. F.
- 2. In a method for making an extruded article in an extruder from powder PVC the improvement comprising the step of extruding a powder PVC compound at a stock temperature of from about 350.degree. F. to about 390.degree. F., and employing a particulate polyvinyl chloride resin, wherein said resin has a weight average particle size in a range from 50 microns to 125 microns, a DOP porosity of from 0.27 cc/gm to 0.50 cc/gm, and a resin friability rating of from 0 to 2.
- 3. A method of claim 2 wherein said extruder is a single screw extruder.
- 4. A method of claim 2 wherein said extruder is a twin-screw extruder.
- 5. A method of claim 1 wherein said average particle size is from 60 microns to 115 microns.
- 6. A method of claim 5 wherein said average particle size is from 70 microns to 100 microns.
- 7. In a method of extruding a louver from a rigid PVC compound comprising the step of extruding said compound in an extruder, the improvement comprising employing a particulate polyvinyl chloride resin having a weight average particle size in a range of from about 50 microns to about 125 microns, a DOP porosity of from 0.27 cc/gm to 0.5 cc/gm, and a resin friability rating of from 0 to 5, wherein:
- when the stock temperature of extrudate is from about 315.degree. F. to about 350.degree. F., said resin has a friability of 0 to 5, and wherein when said stock temperature of extrudate is from about 350.degree. F. to about 390.degree. F. said resin has a friability of from 0 to 2.
- 8. A method of claim 2 wherein said average particle size is from 60 microns to 115 microns.
Parent Case Info
This is a continuation of application Ser. No. 07/762,293 filed Sep. 19, 1991 now abandoned.
US Referenced Citations (6)
Non-Patent Literature Citations (1)
Entry |
Encyclopedia of PVC, vol. 1, p. 200. |
Continuations (1)
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Number |
Date |
Country |
Parent |
762293 |
Sep 1991 |
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