Method for producing synthetic polymerizates with very low residual monomer content
AssigneeStockhausen GmbH & Co. KG
InventorsMiroslav Chmelir, Kurt Dahmen
Life of this patent
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Abstract
The invention relates to a method for producing water-soluble or water-swellable polymerizates with a low residual monomer content from acrylic acid and/or acrylic acid derivatives. The method is characterized by the addition of a nitrogen compound to the monomer solution to be polymerized, an in that the polymerizate is subsequently heated at temperature of 120 to 240° C. The polymerizates produced according to the inventive method are suitable as flocculants, dispersants and absorbers.
Claims19
A process for producing a water-soluble or water-swellable polymer or copolymer comprising, providing an acid monomer or monomers alone, or with a comonomer or comonomers;
- mixing said monomer or monomers with a nitrogen salt compound or compounds selected from the group consisting of amine salts of hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydriodic acid, sulfuric acid, sulfurous acid, sulfoxylic acid, thiophosphoric acid, phosphorous acid, nitric acid and nitrous acid, amine salts of organic acids, hydroxylamine salts, alkanolamine salts, alkylamine salts and mixtures thereof;
- free-radical polymerizing said monomer or monomers alone, or with a comonomer or comonomers to form said water-soluble or water-swellable polymer or copolymer;
- and subsequently heating said water-soluble or water-swellable polymer or copolymer at a temperature of from 120 to 240° C.
Dependencies are inferred from the claim text.