Process for preparing polyphosphonate

Details Process for preparing polyphosphonate Process for preparing polyphosphonate

1974-12-26

1976-03-23

Raymond, Richard L.

Chemistry of carbon compounds

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

260990, C07F 940

Patent

active

039460932

ABSTRACT:
An improvement is disclosed in a process for preparing a polyphosphonate which comprises polycondensing an aromatic diol having the formula (I) - (IV) ##SPC1##
wherein Z represents chlorine or bromine atom or a lower alkyl group and m represents 0 or an integer of from 1 to 4 and n represents 0 or an integer of from 1 to 3; Y represents an alkylene group, cycloalkylene group, sulfonyl group, carbonyl group or oxygen atom; with a dihalide or arylphosphonic or thiophosphonic acid having the formula (V) ##SPC2##
wherein A represents oxygen or sulfur atom; X represents chlorine or bromine atom; Z represents chlorine or bromine atom or a lower alkyl group; and 1 represents 0 or an integer of from 1 to 5, wherein the improvement comprises maintaining a solution of the polyphosphonate at a temperature such that solid polyphosphonate is produced after flashing; and then evaporating all or a part of the solvent from the solution by flashing whereby a porous solid polyphosphonate is formed.

REFERENCES:
patent: 2952666 (1960-09-01), Coover et al.
weissberger, Technique of Organic Chemistry, Vol. III (1956), p. 821.

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