Celanese Emulsions Gmbh

Carsten Heldmann

Thomas Wirth

Martin Jakob

Harald Petri

Harmin Müller

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.

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

The present invention relates to aqueous plastic material dispersions based on vinyl ester copolymers, having a solids content of up to 80% by weight and a minimum film formation temperature below 20&#xb0; C., which is substantially stabilized by ionic components, the vinyl ester copolymers containing at least one homo- or copolymer A and at least one homo- or copolymer B, methods for producing the same and the use thereof.

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Schöneck, Germany

Carsten Heldmann