Process for preparing vinyl amine-containing water soluble copolymers and their use as wet and dry strength agents for paper

TLDR: In this paper, a process for the preparation of polymers containing vinylamine units water-soluble copolymers obtained by copolymerizing a) from 95 to 10 mol% of N-vinylformamide and (b) 5 to 90 mol% of an ethylenically unsaturated monomer from the group vinyl acetate, vinyl propionate, C₁- to C⁄- alkyl vinyl ethers, the esters, nitriles and amides of acrylic acid and methacrylic acid and

Abstract: Verfahren zur Herstellung Vinylamin-Einheiten einpolymerisiert enthaltenden wasserloslichen Copolymerisaten durch Copolymerisieren von a) 95 bis 10 Mol-% N-Vinylformamid und (b) 5 bis 90 Mol-% eines ethylenisch ungesattigten Monomeren aus der Gruppe Vinylacetat, Vinylpropionat, C₁- bis C₄-Alkylvinylether, der Ester, Nitrile und Amide von Acrylsaure und Methacrylsaure und N-Vinylpyrrolidon und anschliesendes Abspalten von 30 bis 100 Mol-% der Formylgruppen aus dem Copolymerisat. A process for the preparation of polymers containing vinylamine units water-soluble copolymers obtained by copolymerizing a) from 95 to 10 mol% of N-vinylformamide and (b) 5 to 90 mol% of an ethylenically unsaturated monomer from the group vinyl acetate, vinyl propionate, C₁- to C₄- alkyl vinyl ethers, the esters, nitriles and amides of acrylic acid and methacrylic acid and N-vinylpyrrolidone and subsequent cleavage from 30 to 100 mol% of the formyl groups from the copolymer. Vorzugsweise kommen Copolmerisate aus N-Vinylformamid und Vinylacetat in Betracht, deren Monomereneinheiten zu jeweils 30 bis 100 Mol-% hydrolysiert sind. Preferably Copolmerisate of N-vinylformamide and vinyl acetate are considered whose monomer units are hydrolyzed to each 30 to 100 mol%. Die Copolymerisate werden bei der Herstellung von Papier zur Erhohung der Trocken- und Nasfestigkeit des Papiers verwendet. The copolymers are used in the manufacture of paper to enhance the dry and wet strength of the paper.