Method for the production of water-in-water polymer dispersions

Details Method for the production of water-in-water polymer dispersions Method for the production of water-in-water polymer dispersions

C - Chemistry, Metallurgy

08

J

C08J 3/03 (2006.01)

Patent

CA 2427713

The invention relates to methods for manufacturing a water-in-water polymer dispersion containing polymer A and at least one polymeric dispersant B, according to which monomers, which are dispersed in an aqueous phase containing water-- soluble dispersant B, are subjected to radical polymerisation, possibly following the addition of a water-soluble salt, and, after polymerisation, a water-soluble acid is added to the water-soluble and/or water-swellable polymer A obtained in this way, where the acid is added in quantities of 0.1 to 0.5% by weight and the salt in quantities of up to a maximum of 3% by weight, each referred to the total dispersion, and the total quantity of salt and acid amounts to a maximum of 5% by weight, referred to the total dispersion.

L'invention concerne un procédé de production d'une dispersion polymère eau-dans-eau contenant un polymérisat A et au moins un dispersant polymère B. Ce procédé consiste à soumettre à une polymérisation radicalaire des monomères, répartis dans une phase aqueuse contenant le dispersant hydrosoluble B et éventuellement additionnés d'un sel hydrosoluble. Ce procédé consiste ensuite, après la polymérisation, à ajouter un acide hydrosoluble au polymérisat A hydrosoluble ou pouvant gonfler dans l'eau ainsi obtenu. Selon la présente invention, l'acide et le sel sont ajoutés dans des volumes respectifs de O,1 à 5 % et d'au maximum 3 % en poids, chacun par rapport à la dispersion totale, et le volume total de sel et d'acide s'élève au maximum à 5 % en poids, par rapport à la dispersion totale.

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