Basf Aktiengesellschaft

Basf Se Corporation

Marc Leduc

Rainer Blum

Anton Esser

Ralf Hemel

Werner Gauweiler

Joachim Kuhn

Stefan Becker

Stefan Frenzel

Volker Braig

Oliver Koch

Norbert Mahr

Peter Claassen

Robert Feuerhake

Simon Champ

Pulakesh Mukherjee

Andreas Merkel

Knut Menke

Peter Leifert

Roland Nowack

A process for the production of paper, board and cardboard by draining a paper stock containing interfering substances in the presence of polymers which contain vinylamine units and which have an average molar mass Mof at least 1 million, a high-consistency stock first being prepared, at least one polymer containing vinylamine units and having an average molar mass Mof at least 1 million and a degree of hydrolysis of from 1 to 20 mol % being metered into the high-consistency stock, the high-consistency stock being diluted to a low-consistency stock by adding water, and the low-consistency stock being drained, the polymers being hydrolyzed homo- or copolymers of N-vinylcarboxamides additives for reducing deposits in the wire part, press section and drying section of paper machines.

Method for producing paper, paperboard and cardboard

A process for the production of paper, board and cardboard by draining a paper stock containing interfering substances in the presence of polymers which contain vinylamine units and which have an average molar mass Mof at least 1 million, a high-consistency stock first being prepared, at least one polymer containing vinylamine units and having an average molar mass Mof at least 1 million and a degree of hydrolysis of from 1 to 20 mol % being metered into the high-consistency stock, the high-consistency stock being diluted to a low-consistency stock by adding water, and the low-consistency stock being drained, and the use of hydrolyzed homo- or copolymers of N-vinylcarboxamides having a degree of hydrolysis of from 1 to 20 mol % and an average molar mass Mof at least 1 million in the production of paper, board or cardboard as an additive to a high-consistency stock containing interfering substances, for reducing deposits in the wire part, press section and drying section of paper machines.

Process for the production of paper, board and cardboard by draining a paper stock on a wire with sheet formation and drying of the sheets, the sheet formation being carried out in the absence of finely divided inorganic flocculants and

Method for the production of paper, paperboard and cardboard

Process for the production of paper, board and cardboard by draining a paper stock with sheet formation in the presence of a retention aid system comprising

Method for the production of paper, cardboard and card

The invention relates to aqueous dispersions of water-soluble polymers of N-vinyl-carboxamides, which are substantially salt-free and comprise anionic polymeric stabilizers having a comb-like molecular structure, processes for the preparation of the dispersions in the presence of anionic polymeric stabilizers having a comb-like molecular structure and the use of the dispersions as retention aids or fixing agents in papermaking.

Aqueous dispersions of water-soluble polymers with comblike stabilizers

An aqueous dispersion of water-soluble polymers obtained by free radical polymerization of ethylenically unsaturated anionic monomers in an aqueous medium in the presence of a stabilizer, wherein the stabilizer comprises: (a) at least one water-soluble polymer selected from the group consisting of a graft polymer of vinyl acetate and/or vinyl propionate on polyethylene glycol, a polyethylene glycol blocked at one or both terminal groups with an alkyl, a carboxyl or an amino group, and a copolymer of alkyl polyalkylene glycol methacrylate and methacrylic acid; and (b) at least one water-soluble polymer selected from the group consisting of a hydrolyzed copolymer of vinyl alkyl ether and maleic anhydride in the form of free carboxyl groups or in the form of salts at least partially neutralized with one or more alkali metal hydroxides or one or more ammonium bases, a cationically modified potato starch, an anionically modified potato starch, a degraded potato starch and maltodextrin.

Aqueous dispersions of hydrosoluble polymerisates of ethylenically unsaturated anionic monomers, method for the production and use thereof

Aqueous dispersions of water-soluble polymers of N-vinylcarboxamides, which contain, as a stabilizer, water-soluble, crosslinked graft polymers which are obtainable by free radical polymerization of compounds having at least two ethylenically unsaturated double bonds in the presence of polyalkylene glycols, are prepared by free radical polymerization of N-vinylcarboxamides in an aqueous medium in the presence of said stabilizers and are used as drainage aids, flocculants and retention aids, as wet and dry strength agents and as fixing agents in papermaking.

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Speyer, Germany

Marc Leduc