Manufacture of polyethers from bis-(4-hydroxyphenyl)-sulfone and bis-(4-chlorophenyl)-sulfone in N-methylpyrrolidone using an alkali metal carbonate as catalysts

US4200728A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerd Blinne · Worms, DE
• Claus Cordes

Key dates

• Filing date: Jun 5, 1978
• Grant date: Apr 29, 1980
• Expiry date: Jun 5, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/4093
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyethers, preferably containing sulfone groups, are obtained by a multi-stage condensation process at from 100.degree. to 230.degree. C. from substantially equivalent amounts of bis-(4-hydroxyphenyl)-sulfone and a dichlorobenzene compound in a polar aprotic solvent in the presence of an anhydrous alkali metal carbonate, with or without the addition of a compound which forms an azeotrope.