Method for producing synthetic polymerizates with a very low residual monomer content, products produced according to this method and the use thereof
AssigneeStockhausen GmbH & Co. KG
InventorsMiroslav Chmelir, Kurt Dahmen
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for producing water-soluble or water-swellable polymer products with low levels of residual monomers using acrylic acid and/or acrylic acid derivatives, which process is characterized by adding a nitrogen compound to the monomer solution to be polymerized and subsequent heating of the polymer product at temperatures of from 120 to 240° C. The polymers produced accordingly are suitable for use as flocculants, dispersants and absorbents.
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 ammonia salts of hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, sulfurous acid, sulfoxylic acid, thiophosphoric acid, phosphorous acid, nitric acid and nitrous acid, ammonia salts of aliphatic, aromatic and mixed aliphatic/aromatic compound(s) 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.