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US 2004/0000741 A1Published application
Manufacture of polyvinylchloride articles
OwnerRobert A. Lindnerinventor
Life of this patent
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Abstract
The present invention describes an advantageous way of lubricating polyvinylchloride during an extrusion process.
Claims18
A method for producing a polyvinylchloride article comprising the steps of:
- operating an apparatus comprising a plurality of roller drums;
- wherein a first roller drum is rotating clockwise;
- wherein a second roller drum is rotating counterclockwise
- wherein a third roller drum is rotating clockwise;
- wherein a fourth roller drum is rotating counterclockwise
- passing a mixture of polyvinylchloride and a lubricant between opposing rotating surfaces of said first roller drum and said second roller drum;
- wherein the mixture of polyvinylchloride and a lubricant are formed into a polyvinylchloride sheet by the action of said first roller drum and said second roller drum;
- said polyvinylchloride sheet having an obverse side and a reverse side;
- provided further that said polyvinylchloride sheet is passed between the opposing surfaces of the said third roller drum and the said second roller drum;
- said third roller drum having an imprinted exterior surface, for when in use, imprinting the obverse surface of the said polyvinylchloride sheet thereby forming an obverse imprinted polyvinylchloride sheet;
- provided further that said polyvinylchloride sheet is passed between the opposing surfaces of the said fourth roller drum and the said third roller drum;
- said fourth roller drum having an imprinted exterior surface, for when in use, imprinting the reverse surface of the said obverse imprinted polyvinyl-chloride sheet thereby forming an obverse and reverse imprinted polyvinylchloride sheet;
- wherein the mixture of polyvinylchloride and a lubricant are premixed into at a temperature of at least about 40° C.;
- and,
- wherein the lubricant is a high density low acid value oxidized polyethylene.
12 more elements
An oxidized polyethylene having a melting point of about 100 degrees C. to 140 degrees C.
A composition comprising oxidized polyethylene prepared by passing an oxygen containing fluid mixture through a liquid high-density polyethylene until such time as the high-density polyethylene is oxidized to a mixture of high-density oxidized polyethylene having 140° C. Brookfield viscosity is less than 100 centipose.
Dependencies are inferred from the claim text.