Method of preparing copolyester carbonate from cyclic aromatic p

Details Method of preparing copolyester carbonate from cyclic aromatic p Method of preparing copolyester carbonate from cyclic aromatic p

1986-08-07

1987-10-13

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528355, 528356, 528357, 528358, 528359, 528370, 528371, C08G 6342

Patent

active

046999744

ABSTRACT:
Cyclic polycarbonate oligomer compositions are polymerized with lactones in the presence of a catalyst for the polymerization of either. Usually, the lactone is first polymerized at a lower temperature, followed by the cyclic polycarbonate at a higher temperature.

REFERENCES:
patent: 3301825 (1967-01-01), Hostettler et al.
patent: 3379693 (1968-04-01), Hostettler et al.

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