Patent · US Expired

Production of hardwearing and shock-resistant extrudates of ultra-high molecular weight polyethylene and apparatus for this purpose

US5063016A · kind A · utility

8Cited by

5References

2Claims

0Family size

Assignee

BASF SE

Inventors

Peter Bauer · Ludwigshafen, DE
Rainer Konrad · Putlitz, DE
Herbert Morgenstern · Ludwigshafen am Rhein, DE
Horst Schuch · Heidelberg, DE

Key dates

Filing date	May 9, 1990
Grant date	Nov 5, 1991
Priority date	—
Expiry date	May 9, 2010

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2995/0088
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

For the production of extrudates of ultra-high molecular weight polyethylene, finely divided polyethylene or polyethylene powder is introduced into the cooled feed zone of a single-screw extruder and compressed therein, melted in a transport zone of the extruder and discharge with shaping of the extrudate and cooling. The polyethylene is processed in the transport zone using a velocity gradient of from 50 to 1,000 sec.sup.-1 in the radial play between the screw and the extruder barrel, heated to 180.degree.-280.degree. C. and then transferred to a screw-free zone in which final shaping of the extrudate is effected.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.