Thermoplastic, branched aromatic polyphosphonates, and a process

Details Thermoplastic, branched aromatic polyphosphonates, and a process Thermoplastic, branched aromatic polyphosphonates, and a process

1981-12-07

1983-11-15

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

260930, 524592, 524609, 524610, 524841, 528125, 528126, 528128, 528169, C08G 7904

Patent

active

044157193

ABSTRACT:
Thermoplastic, branched aromatic polyphosphonates with average molecular weights (number average M.sub.n) of from 11,000 to more than 200,000, obtainable by transesterifying (a) from 97 to 100 moles of at least one diaryl phosphonate, and (b) from 0 to 3 moles of at least one triaryl phosphate--the sum of the moles of (a) and (b) being 100--with (c) from 90 to 99 moles of at least one aromatic dihydroxy compound, and (d) from 0 to 3 moles of at least one aromatic trihydroxy or tetradhydroxy compound--with the proviso that at least one of the components (b) and (d) is present in a quantity of at least 0.001 mole and that, where (b) and (d) are used, the maximum limit on the moles is 3.0.

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.
patent: 4331614 (1982-05-01), Schmidt et al.

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