Method to produce and purify cyclic esters
US5675021A · kind A · utility
4Cited by
44References
130Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1995 |
| Grant date | Oct 7, 1997 |
| Priority date | — |
| Expiry date | Apr 5, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Methods are provided for the production, recovery and purification of cyclic esters. Such methods include producing a cyclic ester composition containing at least one impurity, contacting the cyclic ester composition with at least one adsorbent to remove the impurity and recovering the purified cyclic esters. Also included are methods of cyclic ester purification involving multiple adsorption operations. The methods of the present invention can produce highly purified cyclic esters. Such compositions are suitable for use in the manufacture of polymers having an average degree of polymerization in excess of about 1700.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.