Production of molding materials containing polyphenylene ethers

US4436870A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Hinselmann · Mutterstadt, DE
• Herbert Naarmann · Wattenheim, DE
• Adolf Echte · Ludwigshafen, DE
• Eduard Heil · Schifferstadt, DE
• Albert Nikles · Ludwigshafen, DE
• Rudi W. Reffert · Beindersheim, DE
• Juergen Hambrecht · Heidelberg, DE

Key dates

• Filing date: Jul 22, 1982
• Grant date: Mar 13, 1984
• Expiry date: Jul 22, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/905
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Molding materials containing high molecular weight polyphenylene ethers are produced by a process in which a solution of a polyphenylene ether in an organic solvent, together with another polymer, is freed of solvent by multi-stage evaporation. The solvent is preferably an aromatic compound from the class comprising the hydrocarbons, halohydrocarbons, ethers or esters, the ratio of the other polymer to the polyphenylene ether is advantageously from 99:1 to 20:80 parts by weight, the other polymer is, in particular, a homopolymer or copolymer of styrene or of a homolog thereof, which may be modified with rubber, and the multi-stage evaporation process preferably comprises not less than two and not more than four working up stages. The evaporation is carried out in general at from 120.degree. to 280.degree. C. and under a pressure of from 1 to 3,000 mbar, advantageously in the presence of assistants which reduce the partial pressure, eg. water and/or methanol.