Method of continuously forming an aqueous colorant dispersion using a screw extruder
US9052625B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2013 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Apr 4, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B7/483
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A continuous process for making a pigment dispersion includes continuously feeding a pigment into a feed section of a screw extruder at a controlled rate, continuously feeding a surfactant into the feed section of the screw extruder at a controlled rate, continuously feeding water downstream of the feed section to emulsify the pigment and the surfactant, forming a water-in-pigment dispersion, continuously feeding additional water downstream of the previously fed water to cause a phase inversion of the water-in-pigment dispersion, forming a pigment-in-water dispersion, continuously homogenizing the pigment-in-water dispersion in the screw extruder to create a homogenous aqueous pigment dispersion and collecting the homogenous aqueous pigment dispersion from an exit section of the screw extruder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.