Process for the stabilization of a stabilizer mixtures for recycled plastic mixtures

US6525158B1 · kind B1 · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventors

• Kurt Hoffmann · Taufkirchen, DE
• Heinz Herbst · Herbstein, DE
• Rudolf Pfaendner · Rimbach, DE
• Hans Sander · Ludwigshafen, DE
• Franciszek Sitek · Therwil, CH

Key dates

• Filing date: Sep 17, 1997
• Grant date: Feb 25, 2003
• Expiry date: Aug 10, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/62
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Recycled mixtures of plastics, predominantly thermoplastics, as predominantly produced in the household, in commerce and also in industry and useful material collections, can be stabilized against thermooxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and an inorganic compound from the series consisting of metal oxides, hydroxides and carbonates.