| abstract |
A process for producing a crosslinked carboxyl group containing polymer which comprises polymerizing an α,β- unsaturated carboxylic acid with a crosslinking agent which is polymerizable with the carboxylic acid in an inert mixed solvent in which the monomer can be dissolved but the resulting polymerized product can not be dissolved, i.e., a mixed solvent composed of 70 to 99% by volume of a non-polar aliphatic or alicyclic hydrocarbon and 30 to 1% by volume of a polar ester or ketone in the presence of a radical polymerization catalyst. |