| 摘要 |
<p>Carboxyl-containing polymers which are water-soluble at least in the neutralized form are prepared by a method in which a monoethylenically unsaturated C3-C5-carboxylic acid is polymerized in the presence or absence of a carboxyl-free copolymerizable ethylenically unsaturated monomer in aqueous solution in the presence of polymerization initiator and of from 0.01 to 5% by weight, based on the monomers, of an inorganic acid of phosphorus in which the phosphorus has an oxidation state of from 1 to 4, its water-soluble salts, a water-soluble -PO(OH)2-containing compound and/or its water-soluble salts and, if required, a polymerization regulator. Virtually colorless or only slightly colored polymer solutions are obtained.</p> |
