| abstract |
Use of a polymer as a secondary suspending agent in a suspension polymerization reaction, the polymer comprising (i) residues of at least one ester-containing monomer, the monomer (s) containing the ester comprising a carbon-carbon double bond polymerizable by monomer and an ester group, and (ii) one or more residues of at least one monomer comprising a sulfonate, sulfonic acid, sulfonic ester, sulfonamide or sulfonyl halide group, the monomer comprising (s) a sulfonate, sulfonic acid, sulfonic ester, sulfonamide or sulfonyl halide group comprising a carbon-carbon double bond polymerizable by monomer and a sulfonate group, sulfonic acid, sulfonic ester, sulfonamide or sulfonyl halide, the polymer being optionally partially hydrolyzed so that a proportion of said ester groups form alcohol groups, the degree of hydrolysis being no more than 5 mol%. |