Back to results
US 4,789,725 AGranted
Phenylene ether-carbonate copolymer containing spiroindane group
AssigneeGeneral Electric Company
InventorsThomas L. Guggenheim, Joseph W. Guiles
Life of this patent
Estimating the term…
Abstract
Cyclic polyphenylene ether-polycarbonate oligomer compositions are prepared from bishaloformates and bisphenols, at least one of which includes a spirobiindane moiety and the other of which is derived from a bisphenol-terminated polyphenylene ether oligomer. The cyclic compositions may be converted to linear copolycarbonates by treatment with a polycarbonate formation catalyst.
Claims7
A linear copolycarbonate comprising structural units of the formulas ##STR8## wherein:
- A is a divalent spirobiindane radical of the formula ##STR9## each Q.sup.1 is independently halogen, primary or secondary lower alkyl, phenyl or hydrocarbonoxy;
- each Q.sup.2 is independently hydrogen, halogen, primary or secondary lower alkyl, phenyl or hydrocarbonoxy;
- each R.sup.1 is independently C.sub.1-8 primary or secondary alkyl, phenyl or halo;
- each R.sup.2 is independently hydrogen, methyl, ethyl or phenyl;
- each R.sup.3 is independently C.sub.1-4 primary or secondary alkyl or halo;
- m is from 0 to 4;
- n is 0 or 1;
- p is from 0 to 3;
- and
- x is from 1 to about 5.
7 more elements
Dependencies are inferred from the claim text.