Patent · US Expired

Use of thermoplastic polymethylmethacrylate molding compositions

US6231799A · kind A · utility

7Cited by

6References

16Claims

0Family size

Assignee

Roehm GmbH · DE

Inventors

Peter Kempf · Bad Oldesloe, DE
Norbert Brand · Darmstadt, DE
Helmut Schwind · Hanau, DE
Stefan Roth · Västerås, SE
Holger Moritz · Holzgerlingen, DE

Key dates

Filing date	Feb 17, 1999
Grant date	May 15, 2001
Priority date	—
Expiry date	Feb 17, 2019

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2033/12
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Substantially sulfur free thermoplastic PMMA containing molding compositions are utilized with non-ferrous metal tools for the manufacture of molded articles. The use of such molding materials having a sulfur content of less than 50 ppm reduces the wear on the non-ferrous metal tools, particularly when utilized with injection molding and pressure molding. As a result of the use of sulfur free molding masses where it necessary to utilize tools of non-ferrous metal, there is a substantial economic advantage in the use thereof.

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