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US 6,663,931 B2Granted
White oil extrusion lubricant
AssigneeCrompton Corporation & Petro-Canada
InventorStephen Cedric Cohen
Life of this patent
Estimating the term…
Abstract
The invention pertains to the use of a white oil having a select viscosity as an extrusion lubricant for PVC, including PVC potable water pipe.
Claims25
A polyvinyl chloride composition which comprises:
- (a) 100 parts of a polyvinyl chloride (PVC) resin;
- and
- (b) between about 0.6 part and about 3.0 parts of a white oil having a viscosity of at least about 100 cSt at 40° C., said parts being by weight.
A process for extruding polyvinyl chloride (PVC) which comprises:
- (a) admixing a PVC resin suitable for extrusion with between about 0.6 phr to about 3.0 phr of said PVC resin of a white oil having a viscosity of about 100 cSt at 40° or higher;
- and
- (b) extruding the mixture of step (a).
A potable water pipe comprised of a PVC resin and a white oil having a viscosity of about 100 to about 200 cSt at 40° C., said white oil is present in an amount of about 1.0 to about 2.0 phr of said PVC resin.
A rigid PVC potable water pipe comprised of:
- 100 parts PVC resin;
- 1.0-2.0 parts of a white oil having a viscosity of about 110 cSt at 40° C.;
- 0.3-1.0 parts stabilizer;
- 0.4-1.5 parts calcium stearate;
- 0.0-0.3 parts polyethylene wax;
- 0.5-3.0 titanium dioxide;
- 0.0-5.0 parts calcium carbonate;
- and
- 0.0-3.0 parts process aid/modifier.
6 more elements
Dependencies are inferred from the claim text.