Method for the production of aqueous polymer dispersions containing very few residual monomers and use thereof

US7244812B2 · kind B2 · utility

Assignee

• Celanese Emulsions GmbH · DE

Inventors

• Harmin Müller · Hofheim, DE
• Martin Jakob · Kelkheim, DE
• Carsten Heldmann · Mainz, DE
• Thomas Wirth · Freinsheim, DE

Key dates

• Filing date: Jul 26, 2003
• Grant date: Jul 17, 2007
• Expiry date: Aug 4, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/006
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for reducing the amount of residual monomers in aqueous polymer dispersions means of chemical post-treatment. Post-treatment in the aqueous polymer dispersion is carried out by adding a redox system which contains a) 0.005-5 wt. % of an oxidation agent which contains an organic peroxide. and b) 0.005-5 wt. % of a reduction agent which contains sulfinic acids or salts thereof. Additionally the redox system can, optionally, contain catalytic amounts of a polyvalent metallic ion which can be treated in several valent stages. Post-treatment can be carried out at a temperature ranging from 20-100.degree. C. and at a PH-value ranging from 2-9. The invention also relates to the use of the inventive post-treated polymer dispersion for producing adhesives, coatings, powders, constructive chemical products or for refining textiles or paper.