Wax encapsulated actives and emulsion process for their production
US4919841A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Jun 6, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2989
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process is provided for preparing encapsulated active particles by the steps of: dispersing active materials in molten wax; emulsifying the active/wax dispersion in aqueous surfactant solution for no longer than 4 minutes; quenching the capsules by cooling; and retrieving solidified capsules. The active materials may be selected from chlorine or oxygen bleaching agents, bleach precursors, enzymes, perfumes, fabric softening agents, and surfactants. Optimal capsules are obtainable where a blend of hard and soft waxes are utilized for the coating. The hard and soft waxes are characterized by needle penetration values no higher than 30 mm and no lower than 35 mm, respectively, at 25.degree. C. The resultant capsules have utility for cleaning compositions such as automatic dishwashing detergent formulations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.