Process to produce an aqueous dispersion, an aqueous dispersion produced thereby and a coating composition comprising the aqueous dispersion
US9969897B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 25, 2014 |
| Grant date | May 15, 2018 |
| Priority date | — |
| Expiry date | Sep 7, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/28
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A process to produce a dispersion comprising feeding ethylcellulose polymer and a dispersant into a melt and mix zone of an extruder wherein the ethylcellulose polymer and dispersant are melted and mixed together to form a melt; conveying the melt to an emulsification zone of the extruder in which the temperature and pressure are controlled; feeding a base and water into the emulsification zone wherein the melt is dispersed to form a high internal phase emulsion; conveying the emulsion to a dilution and cooling zone of the extruder; and feeding water into the dilution and cooling zone to dilute the high internal phase emulsion thereby forming an aqueous dispersion is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.