Patent Number: 6,251,972

Title: Process for the stabilization of and stabilizer mixtures for single-material recycled plastics

Abstract: Single-material recycled thermoplastics from commercial and industrial waste can be stabilized against thermal oxidative 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.

Inventors: Hoffmann; Kurt (Lautertal, DE), Herbst; Heinz (Lautertal-Reichenbach, DE), Pfaendner; Rudolf (Rimbach/Odenwald, DE), Sitek; Franciszek (Therwil, CH)

Assignee: Ciba Specialty Chemicals Corp.

International Classification: C08K 3/00 (20060101); C08K 3/22 (20060101); C08K 3/26 (20060101); C08K 5/00 (20060101); C08K 5/13 (20060101); C08K 5/5393 (20060101); C08K 5/524 (20060101); C08K 005/51 ()

Expiration Date: 06/26/2018