Modification of starch with cationic polymers and use of...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/28 (2006.01) C08B 31/00 (2006.01) C08B 31/18 (2006.01) C08L 3/00 (2006.01) C08L 3/02 (2006.01) C08L 3/04 (2006.01) C08L 3/10 (2006.01) D21H 17/44 (2006.01) D21H 17/45 (2006.01) D21H 21/10 (2006.01) D21H 21/20 (2006.01) D21H 17/29 (2006.01)

Patent

CA 2367317

The invention relates to a method for modifying starch by heating the starch in an aqueous medium to temperatures greater than the pasting temperature of the starch in the presence of (a) a polymer cationization agent selected from the group consisting of polymers with molecular weights up to 1 million containing vinylamine units, polyethylene imines, polydiallyldimethylammonium chlorides, condensates of dimethylamine with epichlorohydrin or dichloroalkanes, condensates of dichloroethane and ammonia and mixtures of the above mentioned compounds, and (b) polymer dehydrators for paper selected from the group consisting of water-soluble, crosslinked polyamidoamines that are optionally grafted with ethylene imine, polymers with molecular weights of greater than 1 million containing acrylamide and/or methacrylamide units, polymers with molecular weights of greater than 1 million containing vinylamine units and mixtures of said compounds. The invention also relates to the reaction products obtained by the inventive method and the use of the reaction products as dry-strength agents in the production of paper, board and paperboard.

L'invention concerne un procédé permettant de modifier de l'amidon par chauffage de l'amidon dans une substance aqueuse pour l'amener à des températures supérieures à la température d'encollage de l'amidon en présence (a) d'un agent cationisation provenant du groupe comprenant des polymères de masses molaires allant jusqu'à 1 million contenant des unités de vinylamine, des imines de polyéthylène, des chlorures de polydiallyldiméthylammonium, des condensats de diméthylamine avec de l'épichlorhydrine ou des dichloroalcanes, des condensats de dichloréthane et d'ammoniaque et des mélanges des composés mentionnés, et (b) des agents déshydratants polymères pour papier provenant du groupe des polyamidoamines réticulées solubles dans l'eau, éventuellement réticulées avec de l'imine d'éthylène, des polymères de masses molaires supérieures à 1 million contenant des unités de vinylamine et des mélanges des composés mentionnés. L'invention concerne également des produits de réaction pouvant être ainsi obtenus et l'utilisation des produits de réaction comme agents conférant une résistance à l'état sec lors de la fabrication de papier, de carton-pâte et de carton.

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