Method for preparing high purity indane bisphenols
US5994596A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Mar 31, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2602/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing high purity indane bisphenols in high yield is disclosed. The method comprises heating a bisphenol in the presence of Montmorillonite K10 clay, which catalyzes the synthesis reaction more rapidly and effectively than other clays previously disclosed. The high purity (.gtoreq.97%) of the synthesized indane bisphenol is obtained by two successive selective recrystallizations, the first from an organic solvent, and the second from an acetic acid solution. The high purity indane bisphenols produced may be made substantially pure (>99%) by employing a purification process which includes at least one selective recrystallization from a 45%-80% by volume aqueous acetic acid solution. Alternatively, substantially pure indane bisphenol may be obtained by recrystallization from a solution of 89-93% by volume toluene and 7-11% by volume n-propanol, or by a combination of recrystallizations from toluene/n-propanol and from aqueous acetic acid. Substantially pure indane bisphenols, such as 5-hydroxy-3-(4-hydroxyphenyl)-1,1,3-trimethylindane, are suitable for conversion to high molecular weight polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.