Heterocyclic bis(4-hydroxyphenyl(cycloalkanes and polycarbonates prepared therefrom
US5306832A · kind A · utility
0Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1993 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Oct 7, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A heterocyclohexylidenebisphenol having the formula ##STR1## wherein X is S, SO, SO.sub.2 or N--OCOR 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 bisphenol A or a similar compound with the corresponding thiopyranone or piperidone. The thio compound may be oxidized to the corresponding sulfone. Polycarbonates prepared from said heterocyclic bis(4-hydroxyphenyl)cycloalkanes have high glass transition temperatures and are expected to be ductile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.