Bis(4-hydroxyphenyl)cycloalkanes
USRE35059E · kind E · reissue
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Key dates
| Filing date | Nov 17, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Nov 17, 2014 |
Classification
- Technology area (CPC —)General
Abstract
A heterocyclohexylidenebisphenol having the formula ##STR1## wherein X is S, SO.[.,.]. .Iadd.or .Iaddend.SO.sub.2 .[.or N--COR and R is a C.sub.1-4 primary or secondary alkyl or phenyl optionally substituted by an ethyl or 1-2 methyl groups.]. may be prepared by the reaction of phenol or a similar compound with the corresponding thiopyranone .[.or piperidone.].. The thio compound may be oxidized to the corresponding .Iadd.sulfoxide or .Iaddend.sulfone. Polycarbonates prepared from said heterocyclic bis(4-hydroxyphenyl) cycloalkanes having high glass transition temperatures and are expected to be ductile.
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