Process for the preparation of alginate capsules, apparatus for producing said capsules and cosmetic compositions containing said capsules
US5204111A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1992 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Jan 28, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A process for producing alginate capsules comprises slowly introducing an aqueous alginate solution into crosslinking solution of a polyvalent metal salt. The aqueous alginate solution has mannuronic units (M) and guluronic units (G) in a molar ratio between 0.4 and 1.9 and preferably an amount of (G) blocks greater than 50%. Preferably, the alginate is a sodium alginate having a viscosity, in a 0.5% solution in water at 25.degree. C., lower than 20 mPa.s measured with a TV Contraves viscosimeter having a No. 1 measurement body in the presence of a calcium chelate. The alginate concentration is between 0.2 and 2 weight percent. The polyvalent metal salt concentration in solution is from 3.4.times.10.sup.-3 to 6.8.times.10.sup.-2 M. The alginate capsules are employed in cosmetic compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.