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

1980-10-27

1983-02-22

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

260930, C08G 7904

Patent

active

043749712

ABSTRACT:
A process for the preparation of a linear or branched-chain thermoplastic aromatic polyphosphonate having an average molecular weight (number average M.sub.n) in the range of from 11,000 to 200,000, which comprises solvent-free ester interchange of at least one diaryl phosphonate or at least one diaryl phosphonate and at least one triaryl phosphate with at least one aromatic dihydroxy compound or at least one aromatic dihydroxy compound and at least one aromatic tri- or tetra-hydroxy compound or a mixture thereof in an oxygen-free gas atmosphere at atmospheric pressure or reduced pressure, with removal of the volatile constituents by distillation, and in the presence of a catalytic quantity of an ester interchange catalyst which comprises at least one compound taken from the group, C.sub.1 -C.sub.18 tetraalkyl titanates, C.sub.2 -C.sub.4 dialkyl tin oxides, C.sub.2 -C.sub.4 -di-alkyl-C.sub.1 -C.sub.4 -dialkoxy tin compounds, C.sub.3 -C.sub.18 tetraalkyl zirconates and C.sub.2 -C.sub.18 trialkyl vanadylates, antimony or bismuth salts, C.sub.2 -C.sub.4 dialkyl stannic acid esters, C.sub.2 -C.sub.4 trialkyl stannic acid esters, or a mixture of at least one compound from the above group and germanium dioxide or titanium dioxide.

REFERENCES:
patent: 2636876 (1953-04-01), Zenftman et al.
patent: 2682522 (1954-06-01), Coover, Jr. et al.
patent: 4072658 (1978-02-01), Okamoto et al.

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