Basf Aktiengesellschaft

Dietmar Moench

Heinrich Hartmann

Friedrich Linhart

Wolfgang Reuther

Guenter Scherr

Andreas Stange

Michael Kroener

Primoz Lorencak

Juergen Weiser

Enrique Freudenberg

Franz Merger

Walter Denzinger

Claudia Nilz

Manfred Schwartz

Rudolf Schuhmacher

Norbert Sendhoff

Hans-Ulrich Wekel

Karl-Heinz Buechner

Joerg Liebe

Heinrich Hartman

Aqueous pigment slurries for production of filler-containing paper

Water-soluble condensation products of amino-containing compounds and

Copolymers which are obtained by copolymerization of a) from 5 to 99 mol % of N-vinylcarboxamides, b) from 95 to 1 mol % of monoethylenically unsaturated carboxylic acids and/or the alkali metal, alkaline earth metal, ammonium or amine salts thereof, and if required, c) up to 30 mol % of other monoethylenically unsaturated compounds, and if required, d) up to 2 mol % of crosslinking agents, and subsequent partial or complete elimination of the acyl groups from the N-vinylcarboxamides polymerized in the copolymer, with formation of amino or ammonium groups, are used as additives to paper stock for increasing the drainage rate and the retention in papermaking, and the dry and wet strength of the paper.

Use of hydrolyzed copolymers of N-vinylcarboxamides and

Condensates of polyalkylenepolyamines, their preparation and their use

Water-in-oil emulsions of water-soluble or water-swellable polymers, in which the oil phase of the emulsion consists of not less than 50% by weight of an oil of vegetable or animal origin, contain, as water-in-oil emulsifiers, compounds which are obtainable by

Water-in-oil polymer emulsions

N-vinylformamide is polymerized with or without other water-soluble monoethylenically unsaturated monomers and with or without water-insoluble monoethylenically unsaturated monomers in not less than 30% strength by weight aqueous monomer solutions in the presence of a polymerization initiator at not more than 150.degree. C. in a kneader by a method in which the polymerization is carried out to such an extent that the initially formed water-containing polymer gel disintegrates into fine particles and the finely divided polymer obtainable in this manner is hydrolyzed, preferably in the kneader, so that not less than 0.1 mol % of the N-vinylformamide units present in the polymer are converted into vinylamine units. The polymers obtainable in this manner dissolve readily in water. The aqueous solutions are used, for example, in papermaking and tertiary oil production.

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Weinheim, Germany

Dietmar Moench