Mixtures of thermoplastic polymers in powder form

US5112910A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karl-Erwin Piejko · Bensberg, DE
• Christian Lindner · Bensheim, DE
• Ralph Ostarek · Goldkronach, DE
• Hans-Eberhard Braese · Cologne, DE
• Karl-Heinz Ott

Key dates

• Filing date: Aug 12, 1991
• Grant date: May 12, 1992
• Expiry date: Aug 12, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L51/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for the preparation of mixtures of thermoplastic polymers in powder form from aqueous emulsions of PA0 a) particulate, partly crosslinked rubber-like copolymers of a C.sub.2 -C.sub.8 -alkyl acrylate and/or butadiene with (based on the copolymer) up to 40 wt. % acrylonitrile, styrene or C.sub.1 -C.sub.4 -alkyl methacrylate, PA0 b) a thermoplastic resin, and if appropriate PA0 c) a rubber-rich graft polymer of styrene, .alpha.-methylstyrene, acrylonitrile, methyl methacrylate and/or alkyl acrylate on a diene or alkyl acrylate rubber having a rubber content of 50 to 95 wt. %, wherein aqueous emulsions of a) and b) and if appropriate c) having polymer contents of 15 to 50 wt. % are mixed with a coagulate solution simultaneously, but in separate streams, continuously or semi-continuously at 20.degree. to 100.degree. C., the polymers a) and b) and if appropriate c) being coagulated, the streams are combined and the polymer mixture is then separated off.