Multistage graft copolymer and its use for the preparation of transparent PVC molding materials

US5247025A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Helmut Goertz · Ludwigshafen, DE
• Guenter Hatzmann
• Werner Oschmann · Ludwigshafen, DE

Key dates

• Filing date: Mar 2, 1992
• Grant date: Sep 21, 1993
• Expiry date: Mar 2, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Graft copolymers obtained by PA1 A) emulsion polymerization of from 5 to 35% by weight of a monomer mixture of PA2 a.sub.1) 60-80% by weight of one or more vinylaromatic monomers, PA2 a.sub.2) 20-40% by weight of one or more ethylenically unsaturated nitriles, PA1 B) subsequent emulsion polymerization, in the presence of the emulsion polymer obtained in stage A), of 20-45% by weight of a monomer mixture of PA2 b.sub.1) 50-75% by weight of one or more vinylaromatic monomers, PA2 b.sub.2) 25-50% by weight of one or more C.sub.1 -C.sub.18 -alkyl acrylates, PA1 C) subsequent emulsion polymerization, in the presence of the emulsion polymer obtained in stage B), of 5-35% by weight of a monomer mixture of PA2 c.sub.1) 60-80% by weight of one or more vinylaromatic monomers, PA2 c.sub.2) 20-40% by weight of one or more ethylenically unsaturated nitriles, PA1 D) subsequent emulsion polymerization, in the presence of the emulsion polymer obtained in stage C), of 15-45% by weight of a monomer mixture of PA2 d.sub.1) 80-99.9% by weight of one or more C.sub.1 -C.sub.18 -alkyl acrylates, PA2 d.sub.2) 0.1-0% by weight of one or more di- or polyethylenically unsaturated monomers. The graft copolyme…