Process for preparing bisphenol A of good heat stability
US5300699A · kind A · utility
2Cited by
2References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 13, 1993 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Apr 13, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/86
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a process for preparing bisphenol A of good heat stability by heat-treating bisphenol A containing a very small amount of impurities in a molten state at 185.degree. to 220.degree. C. for 5 to 60 minutes in an oxygen-free atmosphere and the process yields bisphenol A of good heat stability which shows reduced coloration when heated. Bisphenol A prepared by this process has excellent properties relating to color and is particularly suitable as raw material for the manufacture of polycarbonates where the requirement for color is strict.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.