Preparation of polycarbonate having reduced cyclic carbonate oli

Details Preparation of polycarbonate having reduced cyclic carbonate oli Preparation of polycarbonate having reduced cyclic carbonate oli

1986-06-05

1988-12-06

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

526 68, 528196, 528488, 528489, 528491, 528494, 528497, C08G 6362

Patent

active

047897309

ABSTRACT:
The present invention is directed to a continuous process which removes the 1 to 3% cyclic oligomers formed in the polycarbonate process and after hydrolysis of the oligomers recycles the resulting monomer for use in the reaction forming the polycarbonates. To remove the cyclic oligomers to a level so as to produce an improved polycarbonate product and to recover the oligomers in an economical manner for recycling in a continuous process, the selection of a solvent is unique and essential to achieve the continuous process. The solvent for the cyclic oligomers must be immiscible with water, must not react with an alkali and have a cohesive energy density of less than 90.

REFERENCES:
patent: 3264262 (1966-08-01), Baker et al.
patent: 3264263 (1966-08-01), Baker et al.
patent: 4663433 (1987-05-01), Pyles et al.

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