Process for low-concentration, inverse emulsion polymerization of weakly neutralized polymers

摘要

The present invention relates to a process for preparing a polymer by polymerization of an aqueous solution of one or more monomers in water-in-oil inverse emulsion, in which one or more of the monomers used comprise(s) at least one acid function, the molar percentage of monomers bearing at least one weak acid function relative to all the monomers used being at least 30%, wherein:
i) the polymerization is carried out with a concentration of all the monomers in aqueous solution which falls within the range of from 1.3 mmol to 3.6 mmol per gram of aqueous solution,ii) during the polymerization, at most 20% of the acid functions present on the monomers which have at least one acid function are in neutralized form,

and also to the polymers which can be obtained by means of such a process.

主权项

1. A process for preparing a polymer by polymerization of an aqueous solution of one or more monomers in water-in-oil inverse emulsion, in which one or more of the monomers used comprises at least one acid function, the molar percentage of monomers bearing at least one weak acid function relative to all the monomers used being at least 30%, wherein:
i) the polymerization is carried out with a concentration of all the monomers in aqueous solution which falls within the range of from 1.3 mmol to 3.6 mmol per gram of aqueous solution, and ii) during the polymerization, at most 20% of the acid functions present on the monomers which have at least one acid function are in neutralized function.