Basf Aktiengesellschaft

Werner Auhorn

Friedrich Linhart

Hans-Juergen Degen

Heinrich Hartmann

Rolf Fikentscher

Michael Kroener

Werner Streit

Primoz Lorencak

Emil Scharf

Dietmar Monch

Walter Denzinger

Rainer Blum

Rainer Dyllick-Brenzinger

Wilfried Heide

Hubert Meixner

Andreas Stange

Norbert Sendhoff

Guenter Hirsch

Ulrich Riebeling

Guenter Frey

Volkmar Weberndoerfer

Lothar Hoehr

Manfred Matz

Wolf Guender

Rudolf Lorz

Rainer Scholz

Method for producing paper

Aqueous pigment slurries and their use in the production of

Paper, board and cardboard are produced by draining a paper stock, containing undesirable substances, in the presence of hydrolyzed homo- and/or copolymers of N-vinylformamide having a degree of hydrolysis of not less than 60% and a cationic retention aid. According to the invention, faster drainage and improved retention are obtained compared with the use of known fixing agents.

Production of paper, board and cardboard

Paper, board, and cardboard having high dry strength are made by adding to the paper stock a dry strength agent which is obtainable by mixing enzymatically digested starch having a viscosity of from 20 to 2,000 mPa.s (measured in 7.5% strength aqueous solution at 45.degree. C.) and a cationic polymer which contains, as typical copolymerized monomers,

Making paper, board and cardboard of high dry strength

The printability of paper is improved by applying an aqueous coating agent consisting of

Printability of paper

Aqueous pigment suspensions which are added to the stock suspension during papermaking and contain, as a dispersant, from 0.1 to 2% by weight, based on the pigment, of a copolymer which contains, as copolymerized units,

Aqueous pigment suspensions based on alkyl (meth) acrylates as

Paper, board and cardboard are produced by draining a pulp slurry in the presence of high molecular weight, water-soluble polymers of N-vinylamides as drainage aids, retention agents and flocculants. These polymers are particularly effective in a pulp slurry which has a high content of interfering substances and other phenolic compounds.

Paper and cardboard are produced by draining a paper stock by a method in which a stock having a consistency of from 2.5 to 5% by weight is used as a starting material, and (a) from 0.1 to 2% by weight of an activated bentonite are added and the stock consistency is then brought to 0.3-2% by weight by dilution with water, after which (b) from 0.01 to 0.1% by weight of a cationic polyelectrolyte having a charge density of not less than 4 meq/g of polyelectrolyte is added and distributed therein, and, after thorough mixing (c) from 0.003 to 0.3% by weight of a high molecular weight polymer based on acrylamide or methacrylamide is metered in and mixed with the paper stock, the percentages in each case being based on dry paper stock, and the resulting pulp is drained on a wire. The paper obtained is distinguished in particular by good printing properties in the offset printing process.

Production of paper and cardboard

A process for removing anionic compounds from water which is recycled in manufacturing processes, and from waste water, by adding (1) water-soluble products obtained by reacting an alkylating agent, having an aromatic substituent, with a cationic polyelectrolyte and (2) mineral adsorbents and/or a magnesium salt, aluminum salt or iron salt, with formation and flocculation of water-insoluble reaction products.

Removal of anionic compounds from water

Crosslinked water-soluble reaction products for the papermaking industry obtained by reacting

Incorporating a crosslinked polyamidoamine condensation product into

Production of water-soluble crosslinked auxiliaries for the papermaking industry by reacting

Nitrogenous condensation products used as retention aids in papermaking

Growing community of inventors

Frankenthal, Germany

Werner Auhorn