IMPROVED SIZING AGENT FOR PAPER

PROBLEM TO BE SOLVED: 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. SOLUTION: This polymer is obtained by initiating addition polymerization of at least one kind of monome...

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Bibliographische Detailangaben
Hauptverfasser:	SACKMANN GUENTER, KOENIG JOACHIM, JANSEN BERNHARD, WENZ ECKHARD DR, ROICK THOMAS DR, KIJLSTRA JOHAN DR, THIELE BERND
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON IMPREGNATING OR COATING OF PAPER MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: 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. SOLUTION: 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.