Process for working up stabilized ABS polymers with recovery of unreacted monomers

US5225465A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Herbert Eichenauer · Dormagen, DE
• Ulrich Jansen · Düsseldorf, DE
• Ralph Ostarek · Goldkronach, DE
• Otto Koch · Leichlingen, DE
• Karl-Heinz Ott

Key dates

• Filing date: Apr 6, 1992
• Grant date: Jul 6, 1993
• Expiry date: Apr 6, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F279/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for processing polymers of the ABS type present in emulsion form and effectively stabilized against oxidative attack with optionally continuous recovery and direct reuse of untreated monomers, wherein a combination of at least one phenolic antioxidant having a molecular weight above 300 without ester groups in the molecule and at least one sulfur-containing co-stabilizer having a molecular weight above 500 without ester groups in the molecule is added to the ABS polymer emulsion for stabilization against oxidative degradation.