Patent · US Active

Method for extruding plastic materials

US9944008B2 · kind B2 · utility

1Cited by

9References

16Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Thomas Koenig · Leverkusen, DE
Michael Bierdel · Leverkusen, DE
Ulrich Liesenfelder · Bensberg, DE
Klemens Kohlgrüber · Lingen (Ems), DE
Johann Rechner · Krefeld, DE

Key dates

Filing date	May 30, 2009
Grant date	Apr 17, 2018
Priority date	—
Expiry date	Aug 16, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a process for extruding plastic compositions, in particular polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries.

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