Aromatic thermoplastic polyphosphonatocarbonate

US4322520A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Manfred Schmidt · Krefeld, DE
• Ludwig Bottenbruch · Krefeld, DE
• Dieter Freitag · Krefeld, DE
• Werner Nouvertne · Krefeld, DE

Key dates

• Filing date: Jun 18, 1980
• Grant date: Mar 30, 1982
• Expiry date: Jun 18, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/083
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Thermoplastic polyphosphonatocarbonate prepared by polycondensing at least one aromatic dihydroxy compound with a diaryl carbonate and a phosphonic acid diaryl ester in the presence of a basic polycondensation catalyst at a temperature of from 80.degree. to 340.degree. and under a pressure of 600 to 0.1 mm Hg in an inert gaseous atmosphere, the molar ratio of diaryl carbonate to phosphonic diaryl ester being from 5:95 to 95:5 and the molar ratio of aromatic dihydroxy compound to the sum of diaryl carbonate and phosphonic acid diaryl ester being from 0.91:1 to 0.99:1, and following polycondensation, neutralizing said basic catalyst.