Method for preparation of aromatic polyester-polycarbonate

Details Method for preparation of aromatic polyester-polycarbonate Method for preparation of aromatic polyester-polycarbonate

1982-03-19

1984-01-31

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528173, 528191, 528154, C08G 6364

Patent

active

044291035

ABSTRACT:
An aromatic polyesterpolycarbonate containing a dihydroxy-diaryl compound residue, a terephthalic acid residue and/or isophthalic acid residue, and a carbonate bond in a molar ratio of 1:0.25-0.75:0.75-0.25 is prepared by first mixing and reacting an aqueous alkaline solution of a dihydroxy-diaryl compound, an organic solvent solution of terephthaloyl chloride and/or isophthaloyl chloride, and phosgene to obtain a polyesterpolycarbonate oligomer having --OCOCl groups, --COCl groups and --OH groups as end groups and then subjecting the oligomer to polycondensation with a caustic alkali in the substantial absence of the dihydroxy-diaryl compound.

REFERENCES:
patent: 4255556 (1981-03-01), Segal et al.
patent: 4278787 (1981-07-01), Swart et al.

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