Process for preparing multi-stage polymer emulsions and multi-stage polymers formed therefrom
US6252004A · kind A · utility
23Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1999 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Oct 14, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/902
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing emulsion polymer particles comprising: (a) providing an aqueous emulsion of a multistage core-shell polymer with a hydrophilic core, (b) adding one or more inhibitors to substantially stop any polymerization, (c) adding monomer to the emulsion polymer, (d) adding swelling agent and (e) reducing the level of monomer by at least fifty percent. The process produces multistage polymers having low dry-bulk density useful in coating compositions such paints and paper coatings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.