Polycarbonate from heterocyclic bis(4-hydroxyphenyl)cycloalkane
US5300622A · kind A · utility
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13Claims
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Key dates
| Filing date | Dec 11, 1992 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Dec 11, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Heterocyclic bis(4-hydroxyphenyl)cycloalkanes, as illustrated by 4,4-bis(4-hydroxyphenyl)thiopyran and the corresponding acetylated piperidine, 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.