Aromatic thermoplastic polyphosphonatocarbonate

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

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528169, 528196, 528198, 528204, C08G 6362

Patent

active

043225209

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.

REFERENCES:
patent: 2682522 (1954-06-01), Coover, Jr. et al.
patent: 3378523 (1968-04-01), Caldwell et al.
patent: 3597394 (1971-08-01), Rawlings
patent: 4054552 (1977-10-01), Hoogeboom
patent: 4223104 (1980-09-01), Kim et al.

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