Verwendung von waessrigen kationaktiven Kunststoffdispersionen zur Oberflaechenbehandlung insbesondere zur Oberflaechenleimung von Papier und papieraehnlichen Faservliesen

摘要

A stable cation-active plastic dispersion is prepared by copolymerizing, an ethylenically unsaturated compound difficultly soluble in water, in an aqueous dispersion containing cation-active dispersing agents with 1 to 50% of the total amount of monomers, of a N- or C- vinyl substituted aromatic compound which contains at least one quaternary nitrogen atom in the nucleus or in a side chain. A non-ionic dispersing agent may also be present. Specified ethylenically unsaturated compounds are acrylic and methacrylic esters from methyl to stearyl; vinyl esters from acetate to stearate, acrylonitrile and methacrylonitrile, vinyl chloride, vinyl fluoride, vinylidene chloride, styrene, orthochlorostyrene, alpha-methyl styrene, vinyl toluenes, mixtures of these monomers with each other or with butadiene, chloroprene, isoprene, vinyl isobutyl ether or the methyl to butyl diesters of maleic or fumaric acids; up to 10% of a water-soluble non-ionic vinyl compound, e.g. acrylamide and methacrylamide or vinyl pyrrolidene may also be present. Specified comonomers include 1-methyl-2-vinyl pyridinium bromide and methosulphate, 2-vinyl pyridium ethyl sulphate, 1-benzyl-4-vinyl-quinolinium chloride, N-vinyl-n1-methyl imidazolium bromide and methosulphate, and N,N,N-trimethyl-N-(4-vinylbenzyl) ammonium chloride. Specified cation-active dispersing agents include the water-soluble salts of fatty amines and hydroxyethylated fatty amines with lower aliphatic carboxylic acids or inorganic acids while specified non-ionic dispersing agents include hydroxyethylation products of fatty alcohols and phenols. Cation-active protective colloids such as polyvinylpyridinium salts or polyvinylimadazolium salts may also be used. The copolymerization process may take place in aqueous dispersion using persulphates, percarbonates or, preferably, hydrogen peroxide. Small amounts of water-soluble salts of iron, cobalt, copper and nickel may be present.