Process for preparing a powder of water-insoluble polymer which can be redispersed in a liquid phase, the resulting powder and utilization thereof
US4968350A · kind A · utility
48Cited by
4References
10Claims
0Family size
Inventors
Key dates
| Filing date | Dec 9, 1988 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Dec 9, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/286
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The process for preparing a redispersible powder of a water-insoluble polymer by a producing a gel of a water-soluble macromolecular substance and water. Then a second solution is prepared by mixing a single organic solvent which is partially miscible with water and a water-insoluble polymer. These two solutions are emulsified and then water is added to diffuse the solvent to form microparticles in suspension. The particles are collected by a conventional method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.