Oxidized polyethylene and use as lubricant for polyvinylchloride

US5064908A · kind A · utility

Assignee

• BASF SE

Inventors

• Ludwig Schuster · Schifferstadt, DE
• Albert Hettche · Heßheim, DE
• Werner Liedy · Hochdorf-Assenheim, DE
• Stefan Weiss · Trostberg, DE
• Leo Ehemann · Bad Dürkheim, DE

Key dates

• Filing date: Nov 6, 1990
• Grant date: Nov 12, 1991
• Expiry date: Nov 6, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L23/30
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Oxidized polyethylenes useful as lubricants in the extrusion of polyvinyl chloride are prepared by oxidation of finely divided polyethylene of high density at elevated temperatures with an oxidation gas of air and/or oxygen, the polyethylene used containing from 0.015 to 0.5% by weight of a free radical former organic compound in admixture and being contacted per hour with an oxidation gas which per kilogram of polyethylene contains from 30 to 600, in particular from 80 to 300, mg of ozone, with or without a reduced pressure treatment at elevated temperatures after the oxidation.