Aromatic polyphosphonates and a process for their production

Details Aromatic polyphosphonates and a process for their production Aromatic polyphosphonates and a process for their production

1980-06-18

1982-05-25

Sutto, Anton H.

Chemistry of carbon compounds

Dipeptides, e.g., aspartame, anserine, carnosine, etc.

260982, 528167, C07F 940, C08G 7900

Patent

active

043316140

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 moled 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 tetrahydroxy 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: 2682522 (1954-06-01), Coover, Jr. et al.

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