Method for preparing spirobiindane polycarbonates

Details Method for preparing spirobiindane polycarbonates Method for preparing spirobiindane polycarbonates

1987-04-20

1990-08-21

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528198, 528199, 528200, C08G 6420

Patent

active

049507311

ABSTRACT:
Homo- and copolycarbonates of spirobiindane bisphenols are prepared by first reacting phosgene with a substantially pure spirobiindane bisphenol in the presence of aqueous base in a heterogeneous medium at a pH in the range of about 9-11, and subsequently adding an interfacial polycarbonate formation catalyst and, optionally, a dihydroxyaromatic compound and a chain termination agent and continuing phosgene passage at a pH of at least about 10. By this method, there may be prepared homo- and copolycarbonates of 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1-spiro(bis)indane having high molecular weight. Said homopolycarbonates and copolycarbonates with bisphenol A may be used for manufacture of optical disks having low birefrigence.

REFERENCES:
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patent: 4471105 (1984-09-01), Campbell et al.
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patent: 4515936 (1985-05-01), Sikdar et al.
patent: 4552949 (1985-11-01), Mark
Condensed Chemical Dictionary; Eighth Edition; 1971; p. 448.
Stueben, J. Poly. Sci., Part A, 3, 3209-3217, (1965).

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