To obtain an aqueous emulsion polymer exhibiting proper and improved performance characteristic and high disperse stability as a sizing agent and having low foaming tendency.
This polymer is obtained by initiating addition polymerization of at least one kind of monomer by free-radical reaction in the presence of a mixture of (A) a degraded starch with (B) at least one kind of polymer emulsion selected from a group comprising (i) sulfo-containing maleic anhydride copolymers and/or terpolymers, (ii) sulfo-containing oligourethanes having branched molecular structure and (iii) a mixture thereof and preferably a water- soluble oxidation-reduction system. A method for producing the emulsion polymer preferably comprises polymerizing a monomer until the conversion ratio reaches 95% and completing the polymerization in the presence of an organic peroxide exhibiting low solubility in water.
WENZ ECKHARD DR
KOENIG JOACHIM
JANSEN BERNHARD
ROICK THOMAS DR
THIELE BERND
KIJLSTRA JOHAN DR
