AQUEOUS DISPERSION OF WATER-SOLUBLE AMIDINE POLYMER, AND ITS PRODUCTION

PROBLEM TO BE SOLVED: To provide an aqueous dispersion of a water-soluble amidine polymer that is excellent in handling properties with a low viscosity maintained even at a high concentration and has a stable dispersion state, and provide a process for producing the aqueous dispersion thereof. SOLUT...

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1. Verfasser:	KUBO KATSUHISA
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON DYES MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POLISHES SEPARATION THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an aqueous dispersion of a water-soluble amidine polymer that is excellent in handling properties with a low viscosity maintained even at a high concentration and has a stable dispersion state, and provide a process for producing the aqueous dispersion thereof. SOLUTION: This aqueous dispersion of a water-soluble amidine polymer has an amidine unit represented by the formula (wherein R1 and R2 are each independently hydrogen or a methyl group; and one amidine unit constitutes two polymer structure units) and 1-10 mol%, based on the total structure units in a polymer, carboxylic acid unit. A process for producing an aqueous dispersion of a water-soluble amidine polymer comprises a first step of polymerizing an N-vinyl carboxylic acid amide, a (meth)acrylonitrile and a polymerizable unsaturated carboxylic acid in a water solvent to produce an aqueous dispersion of a polymer, wherein the amount of the charge stock of a polymerizable unsaturated carboxylic acid is 1-10 mol%, based on the total monomers and a dispersant comprising a water-soluble polymer or a surfactant is allowed to coexist, and a second step of acid-modifying the aqueous dispersion of the polymer produced in the first step in the presence of nitrate ions.