Process for preparing high internal phase ratio emulsions and latexes derived thereof
US5688842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1996 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | Apr 10, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/929
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is a method of preparing a high internal phase ratio emulsion without phase inversion comprising the steps of: PA1 a) continuously merging into a disperser and in the presence of an emulsifying and a stabilizing amount of a surfactant, a continuous phase liquid stream having a flow rate R.sub.1, and a disperse phase liquid stream having a flow rate R.sub.2 ; and PA1 b) mixing the merged streams with a sufficient amount of shear, and with R.sub.2 :R.sub.1 sufficiently constant, to form the high internal phase ratio emulsion without phase inversion or stepwise distribution of an internal phase into an external phase; wherein R.sub.2 :R.sub.1 encompasses a range, the lower limit of which range being defined by a point where the volume average particle size of the high internal phase ratio emulsion begins to show an inverse dependence on R.sub.2 :R.sub.1, and wherein the upper limit of which range is just less than an R.sub.2 :R.sub.1 where a phase inversion of the high internal phase ratio emulsion takes place. Monodisperse submicron particles can be prepared using the process of the present invention. Useful latexes can be prepared from these high internal phase…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.