Removal of volatile organic compounds from polymer dispersions
US6740691B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2002 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Sep 10, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/006
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for treating an aqueous polymer latex/dispersion of synthetic polymers prepared by polymerizing one or more monomeric materials for at least 80%, involving:A. adding to the polymer latex/dispersion a sufficient amount of at least one reducing agent in one or more portions followed by adding at least one free radical generator in such a way that at least the bulk of the reducing agent has been added before addition of free radical generator is started and maintaining the mixture at a suitable temperature for a period of time which is sufficient to reduce the VOC-level of the latex/dispersion to decrease to below 1,500 ppm, preferably to below 1,000 ppm after whichB. water vapor and/or gas is/are sparged into the latex/dispersion while the temperature of the latex/dispersion is maintained at a suitable temperature for a period of time which is sufficient to decrease the VOC-level to below 200 ppm, preferably to below 50 ppm, most preferably to below 15 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.