Process for the preparation of diesters of poly(oxyalkylene glycol) and amino acids
US6346643B1 · kind B1 · utility
2Cited by
0References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2000 |
| Grant date | Feb 12, 2002 |
| Priority date | — |
| Expiry date | Mar 6, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/33396
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of diesters of poly (ethylene glycol) by reacting poly (oxyalkylene glycol) and amino acid hydrochloride in the presence of a condensing agent in a suitable solvent at a temperature in the range of 0° C. to room temperature for a period ranging between 1 hour to 24 hours. The reaction mixture is then filtered and the filtrate poured into another solvent, which is a nonsolvent for the products. The products precipitated thereby are then isolated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.