Process for reducing odor emission in aqueous polymer dispersions and in polymer powders
US6727323B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 2003 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Jun 17, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/006
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for reducing odor emission in aqueous polymer dispersions and in polymer powders comprises admixing an aqueous dispersion of a polymer obtained by free-radical polymerization of one or more ethylenically unsaturated monomers, after conclusion of the polymerization, with an odor-reducing composition containing a) one or more water-soluble compounds selected from metal salts of copper(II), silver, aluminum, zinc and iron(III), potassium permanganate, imidazoline, and imidazoline derivatives, optionally in combination with b) one or more water-soluble reducing agents selected from ascorbic acid, isoascorbic acid, iron(II) salts, zinc formaldehydesulfoxylate and alkali metal formaldehydesulfoxylate, and optionally drying the thus treated aqueous polymer dispersion to form a polymer powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.