C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 8/12 (2006.01) C08F 126/02 (2006.01) D21H 17/34 (2006.01) D21H 21/18 (2006.01) D21H 21/20 (2006.01)
Patent
CA 2186782
A process for producing long-shelf-life aqueous solutions of vinyl-amine-unit- containing polymers by the hydrolysis of N-vinyl-carbonamide-containing polymers with acids in an aqueous medium and removing the carboxylic acids separated from the polymers as esters from the aqueous polymer solution following hydrolysis and by the addition of at least stoichiometric quantities of at least one C1 to C6 alcohol and distilling the esters off from the reaction mixture. The invention also relates to the use of the long-shelf-life aqueous solutions of vinyl-amine-unit-containing polymers as dry and wet consolidating agents in paper manufacture.
La présente invention concerne un procédé de préparation de solutions aqueuses de longue conservation de polymères contenant des unités vinyle-amine, consistant à faire l'hydrolyse de polymères contenant des unités N-vinylcarboamide avec des acides dans un milieu aqueux et, tout de suite après l'hydrolyse, à extraire de la solution polymère aqueuse les acides carboniques séparés des polymères en tant qu'esters en ajoutant des quantités au moins stoechiométriques d'au moins un alcool C¿1? à C¿6? à séparer par distillation les esters du mélange réactionnel. L'invention concerne également l'utlisation de ces solutions aqueuses de longue conservation de polymères contenant des unités vinyle-amine comme agents de consolidation par voie sèche et humide dans la fabrication du papier.
Kroner Michael
Nilz Claudia
Schuhmacher Rudolf
Stange Andreas
Winter Manfred
Basf Aktiengesellschaft
Borden Ladner Gervais Llp
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