High purity polysaccharide containing a hydrophobic group and process for producing it
US6566516B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 25, 2000 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Apr 25, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B37/0021
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A high purity polysaccharide containing hydrophobic group is produced by a process involvinga first process step of producing an isocyanate group-containing hydrophobic compound, wherein one mole of a hydroxyl group-containing hydrocarbon having 12-50 carbon atoms or of a sterol is reacted with a diisocyanate represented by OCN—R1—NCO in which R1 is a hydrocarbyl of 1-50 carbon atoms,a second process step of producing the polysaccharide containing hydrophobic group composed of the hydrocarbon group of 12-50 carbon atoms or of the steryl group, wherein the isocyanate group-containing hydrophobic compound obtained in the first process step is reacted with one or more polysaccharides, anda purification step in which the reaction product in the second process step is purified using a solvent based on a ketone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.