Process for the preparation of thermoplastic aromatic polyphosph

Details Process for the preparation of thermoplastic aromatic polyphosph Process for the preparation of thermoplastic aromatic polyphosph

1984-03-30

1984-11-06

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, 528169, C08G 7904

Patent

active

044813503

ABSTRACT:
The subject of the present invention is a process for the preparation of polyphosphonates containing carbonate structures in amounts of 0.3 to 4.5 mol %, relative to the sum of phosphonate and carbonate structural units, which is characterized in that diaryl phosphonates are reacted with diphenols in the presence of neutral transesterification catalysts, and the reaction is then completed by adding diaryl carbonate.

REFERENCES:
patent: 4322520 (1982-03-01), Schmidt et al.
patent: 4331614 (1982-05-01), Schmidt et al.
patent: 4374971 (1983-02-01), Schmidt
patent: 4401802 (1983-08-01), Schmidt

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