Method of producing ABS moulding compositions

US5981644A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ralph Ostarek · Goldkronach, DE
• Herbert Eichenauer · Dormagen, DE
• Karl-Erwin Piejko · Bensberg, DE
• Frank Wingler · Leverkusen, DE
• Claus Wulff · Krefeld, DE

Key dates

• Filing date: Mar 14, 1997
• Grant date: Nov 9, 1999
• Expiry date: Mar 14, 2017

Classification

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

Abstract

A method of producing ABS moulding compositions wherein a solution of polymers in group (A) solvents is gradually supplied to a polymerizing mixture of previously-formed soluble rubber, aromatic mono-alkenyl compounds, ethylenically unsaturated nitrites, optional other copolymerizable compounds and optionally a group (B) solvent or a mixture of group (A) and group (B) solvents, the gradual addition of the polymer solution to the polymerizing mixture being started before the beginning of phase inversion and at a monomer conversion rate of 5 to 15% and a viscosity of the polymerizing mixture of less than 20 Pa.sec with simultaneous continuation of polymerization, the group (A) solvent is an aliphatic (C.sub.1 -C.sub.8) or cycloaliphatic alcohol, ketone, ether, ester and/or nitrile, and the group (B) solvent is an aliphatic (C.sub.4 -C.sub.10), cycloaliphatic and/or aromatic hydrocarbon.