Process for the stabilization of and stabilizer mixtures for recycled plastics

US5643985A · kind A · utility

Assignee

• Ciba-Geigy · 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: Mar 21, 1995
• Grant date: Jul 1, 1997
• Expiry date: Mar 21, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/5393
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Recycled plastics, predominanty thermoplastics, from domestic, commercial and industrial waste can be stabilized against thermooxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and a metal salt of a fatty acid.