Process for making polymer matrix capsules containing large hydrocarbon drops suitable for incorporating large size actives to be used in liquid detergent compositions
US5753152A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 1995 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Sep 6, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J13/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a process for preparing matrix capsules having hydrocarbon cores sufficiently large to contain large size particle actives which process comprises dispersing actives in hydrocarbon core material, and dispersing the active containing hydrocarbon in a polymer solution to form a polymer matrix emulsion of drops of said core material in said solution. The key to the invention is to obtain the dispersion by utilizing low shear rates previously uncontemplated using the standard shearing machinery of the art. This in turn is accomplished by maintaining the core within defined rheological parameters. By using lower shear rates, applicants were unexpectedly able to prepare capsules capable of stably incorporating large size actives in the core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.