Basf Aktiengesellschaft

Basf Se Corporation

Josef Neutzner

Oral Aydin

Walter Maechtle

Michael Portugall

Anton Esser

Hans-Joachim Haehnle

Jacques Dupuis

Ralf Widmaier

Karl-Hermann Strube

Rainer Blum

Eberhard Schupp

Rainer Dobrawa

Gerhard Bauer

Volker Braig

Bernd De Potzolli

Klaus Schnell

Ulrich Filges

Martin Meister

Reinhold Dieing

Peter Baumann

Wolfgang Bouquet

Andreas Gruber

Jürgen Nieberle

Eckehardt Wistuba

Maximilian Angel

Ivette Garcia Castro

Joachim Pakusch

Gerd Rehmer

Dieter Faul

Manfred Niessner

Wilhelm Friedrich Beckerle

Peter Keller

Robert Rupaner

Stefan Stein

Andree Dragon

Gernot Franzmann

Uwe Dittrich

Martin Ruebenacker

Hans-Joachim Hähnle

Johannes Dobbelaar

Martin Wendker

Bernd Stanger

Peter Hössel

Peter Pfoehler

Sven Lawrenz

Norbert Schall

Helmut Mueller

Franz-Josef Mueseler

Berthold Sturm

Erik Bohrer

Olga Pinneker

J&uuml;rgen Nahstoll

J&uuml;rgen Hartmann

Norbert Gebhardt

Johannes Tuerk

Martin Rübenacker

Axel Ferber

Bernd Daeumer

Simone Lehnert

Peter Mendera

The invention relates to a process for producing paper, board and cardboard of high dry strength by separately adding a polymer comprising vinylamine units and a polymeric anionic compound to a paper pulp, dewatering the pulp and drying the paper products, which comprises using as polymeric anionic compound at least one copolymer obtainable by copolymerizing 

Method for producing high dry strength paper, paperboard or cardboard

The present invention relates to an aqueous composition comprising at least one finely divided filler and at least one water-soluble amphoteric copolymer, a process for the preparation of such a composition and its use as an additive in the production of paper, cardboard and board.

Aqueous composition and use thereof for paper production

Aqueous slurries of finely divided fillers which are at least partly coated with polymers and which are obtainable by treating aqueous slurries of finely divided fillers with at least one water-soluble amphoteric copolymer

Aqueous slurries of finely divided fillers, their preparation and their use for the production of filler-containing papers

Method of producing copolymers by free-radical polymerization of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer in an organic solvent in the presence of an initiator, where the polymerization is carried out under a gauge pressure such that evaporation of the components is avoided.

Method of producing water-soluble nonturbid copolymers of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer by polymerization under increased pressure

Aqueous solutions comprising: one or more polymeric components selected from the group consisting of homopolymers of N-vinylpyrrolidone, copolymers of N-vinylpyrrolidone, and mixtures thereof; and hydrogen peroxide; wherein the hydrogen peroxide is present in an amount of 100 to 5000 ppm; and methods of stabilizing aqueous solutions containing one or more polymeric components selected from the group consisting of homopolymers of N-vinylpyrrolidone, copolymers of N-vinylpyrrolidone, and mixtures thereof.

Stabilisation of aqueous solutions of homopolymers and copolymers of N-vinylpyrrolidones

Methods of producing vinyllactam copolymers which include: providing at least one water-soluble N-vinyllactam; providing at least one hydrophobic comonomer; and subjecting the at least one water-soluble N-vinyllactam and the at least one hydrophobic comonomer to free-radical polymerization in an organic solvent in the presence of an initiator, under a combination of process measures selected from the group consisting of A and B; wherein:

Methods of producing water-soluble, non-turbid copolymers of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer

At least one single-stage or multistage stirrer which produces not only a tangential flow component but also an axial flow field is used in a stirred-vessel reactor in connection with the preparation of polymers by liquid phase polymerization.

Use of a single-stage or multistage stirrer to prepare polymers

An aqueous polymer dispersion with a solids volume concentration of at least 50% by volume is obtainable by polymerizing monomers by the method of free radical aqueous emulsion polymerization with the addition of at least one fine and at least one coarse aqueous starting polymer dispersion.

Aqueous polymer dispersion

An aqueous polymer dispersion having a solids volume concentration of 50% by volume or more is obtainable by polymerizing radical polymerizable monomers other than vinyl or vinylidene halides by the method of free radical aqueous emulsion polymerization with the addition of an aqueous starting polymer dispersion having a certain diameter distribution of the starting polymer particles present therein by the stream addition process.

An aqueous polymer dispersion with a final solids volume concentration of at least 50% by volume is obtainable by polymerizing at least one radical polymerizable monomer by the method of free radical aqueous emulsion polymerization with the addition of an aqueous dispersion of a starting polymer.

Aqueous polymer dispersion having a broad particle size distribution

Aqueous polymer dispersion having a wide particle size distribution

An aqueous polymer dispersion with a solids volume concentration of at least 50% by volume is obtainable by polymerizing monomers by the method of free radical aqueous emulsion polymerization with the addition of at least two starting polymer dispersions, of which one contains not only particularly finely divided but also coarsely divided polymer particles.

Aqueous polymer dispersion having a broad particle distribution

In a process for preparing a final aqueous polymer dispersion having a solids volume concentration of 50% by volume or more, free-radically polymerizable monomers other than vinyl or vinylidene halides are subjected to a free radical aqueous emulsion polymerization by the feed stream addition process in the presence of an aqueous starting polymer dispersion whose dispersed starting polymer particles have a certain minimum diameter.

Preparation of an aqueous polymer dispersion

Growing community of inventors

Neustadt, Germany

Josef Neutzner