Thermoplastic compositions in powder form

US4522959A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Lindner · Bensheim, DE
• Karl-Heinz Ott
• Hans-Eberhard Braese · Cologne, DE

Key dates

• Filing date: Mar 28, 1984
• Grant date: Jun 11, 1985
• Expiry date: Mar 28, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L21/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of a pulverulent mixture consisting of PA0 (A) from 60 to 99 parts by weight of a brittle copolymer consisting of acrylonitrile and styrene, .alpha.-methylstyrene, methyl methacrylate or mixtures thereof, and PA0 (B) from 1 to 40 parts by weight of a flexible rubber-elastic polymer, by coagulating, in a first stage, a latex of (A) or a mixture of a latex of (A) and a part of a latex of (B), adding, in a second stage, the latex of (B) or the remaining part of the latex of (B), so that the desired quantity ratio of (A) to (B) is attained, and, in a third stage, separating the precipitated mixture of (A) and (B) from the aqueous phase, and drying it.