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Abstract

The present invention relates to a method for producing polymers that are suitable for absorbing and storing aqueous liquids, and to polymers that can be obtained by this method. This invention further related to the use of such polymers. The method comprises the following steps:

i. crosslinking free-radical polymerization of a monomer composition M comprising a) at least one monomer A having an ethylenic double bond and at least one neutralizable acid group or a group hydrolyzable to a neutralizable acid group,b) optionally one or more comonomers B which are different than the monomers A and have one ethylenic double bond, andc) 0.05 to 10% by weight, based on the total amount of monomers A and B, of at least one crosslinker C,in the presence of at least one polysaccharide-comprising substance S, in an aqueous liquid, where the weight ratio of the monomer composition M to the substance S is in the range from 9:1 to 1:9; and ii. at least partial neutralization of the acid groups and/or hydrolysis of the groups hydrolyzable to neutralizable acid groups in the polymer obtained in step i.;wherein the polymerization and/or the neutralization is performed in the presence of urea.

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First Claim