Polycarbonate copolymer of spirobisindan and bisphenol-A, method

Details Polycarbonate copolymer of spirobisindan and bisphenol-A, method Polycarbonate copolymer of spirobisindan and bisphenol-A, method

1994-04-12

1995-06-13

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528198, C08G 6400

Patent

active

054243890

ABSTRACT:
A polycarbonate copolymer of a spirobisindan (6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobisindan) and bisphenol-A in which the mole fraction of the spirobisindan .alpha. ranges between 0.844 and 0.887 is provided. Such a copolymer has a stress-optical coefficient C.sub.m in the melt which is equal to zero or substantially equal to zero, so that the sensitivity of the polymer to orientation birefringence is very small. Such a copolymer can be rendered optically isotropic and is very suitable for use in optical components in which birefringence is undesirable. Examples of such optical components are lenses and substrates for optical information media.

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