Process for crystallizing D-alpha-tocopheryl succinate
US5786491A · kind A · utility
5Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Dec 6, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/72
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a process for whereby d-alpha-tocopheryl succinate (TS) can be crystallized in a short period of time by subjecting a fluid TS at particular temperature to a particular rate of shear for a particular time in order to accomplish crystallization. Then, while maintaining the crystallized TS at a temperature less than its melting point, we withdraw the crystallized TS from the region of shear flow. In a preferred embodiment of our process, crystallization is enhanced by use of a particular elongational rate for a particular time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.