Method for the preparation of purified elastomers from solution
AssigneeBayer Aktiengesellschaft
InventorsDirk Achten, Rafael Warsitz, Gregor Dudziak, Franz-Josef Mersmann, Stephen Pask, Zsolt Szentivanyi
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Abstract
The present invention relates to a method for the preparation of purified elastomers prepared by emulsion polymerization, wherein the level of impurity is reduced by up to 99 wt. %, expressed in terms of the unpurified elastomer. The present invention also relates to elastomers which can be obtained by the method according to the present invention, to the use of the elastomers for the production of all types of products, and to the product which is produced by processing the elastomer which can be obtained by the method according to the present invention.
Claims9
A method for the preparation of purified elastomers comprising the steps of
- a) ultrafiltering an unpurified elastomer, prepared by emulsion polymerization, in the presence of an organic solvent and separately collecting the permeate containing the impurities, from the retentate containing the purified elastomer, and
- b) adjusting the flow rate of the retentate to a value of more than 1 m/sec during the ultrafiltration,
- wherein the elastomer is prepared by emulsion polymerization, and
- wherein the level of impurity is reduced in the elastomer by up to 99 wt. % based on the weight of the unpurified elastomer.
Dependencies are inferred from the claim text.