Process for preparing a free-flowing powder containing a deliquescent quaternary ammonium compound
US8916214B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Dec 24, 2009 |
| Grant date | Dec 23, 2014 |
| Priority date | — |
| Expiry date | Dec 21, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA23V2002/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A process is described for obtaining free flowable, carrier free powders from aqueous solutions of deliquescent quaternary ammonium compounds in a two step process, comprising a drying and a powder mixing step. The excellent free-flowing and stability characteristics of the final product could only be obtained when among possible other additives at least one univalent metal fatty acid salt is added to the liquid phase in the drying step and at least one multivalent metal fatty acid salt in the powder mixing step. A surprising synergy was observed between these additives when applied as described in the present invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.