Process for preparing dispersion powders
US9815977B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 2014 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Oct 29, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2429/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention provides a process for preparing dispersion powders by spray drying of aqueous polymer dispersions of polymers of one or more ethylenically unsaturated monomers selected from the group encompassing vinyl esters, methacrylic esters, acrylic esters, olefins, dienes, vinylaromatics, and vinyl halides with a drying gas in a nozzle atomization dryer, characterized in that the aqueous polymer dispersion (feed), before being atomized, is preheated under pressure to a temperature of 100° C. to 200° C. and is atomized at this temperature, the pressure being set such that the aqueous phase of the polymer dispersion does not boil at the temperature selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.