Phase inversion emulsification process for controlling latex particle size
US9964880B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2017 |
| Grant date | May 8, 2018 |
| Priority date | — |
| Expiry date | Mar 22, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/03
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A phase inversion emulsification process for controlling latex particle size including a) combining a resin, an organic solvent, an optional neutralizing agent, and a first portion of water in a reactor; wherein said reactor is equipped with a jacket, a vacuum, a condenser connected to the reactor by a distillate conduit, and a receiver connected to the condenser by a condensate conduit, to form a water-in-oil dispersion mixture; b) adding a second portion of water to the reactor to convert the water-in-oil dispersion mixture into an oil-in-water dispersion comprising a latex emulsion of latex particles; c) forming a distillate and controlling the distillate temperature by at least one of: adjusting the jacket temperature, adjusting the vacuum level, or a combination thereof; wherein controlling the distillate temperature controls a particle size distribution change of the latex particles during solvent removal; wherein the distillate temperature is from about 30 to about 80° C.; d) performing solvent removal wherein volatile organic compounds are pulled out of the liquid phase in the reactor to a vapor phase and transferred to the condenser via the distillate conduit; e) cooling d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.