Basf Aktiengesellschaft

Rainer Tresch

Karl-Heinz Etzbach

Friedrich Linhart

Torsten Freund

Rüdiger Sens

Heinrich Hartmann

Walter Denzinger

Sophia Ebert

Udo Mayer

Thomas Gessner

Michael Kroener

Michael Schmitt

Hellmut Kast

Norbert Sendhoff

R&uuml;diger Sens

Bernhard Mohr

Enrique Freudenberg

Dietrich Fehringer

Gunter-Rudolf Schroder

Roland Merger

Claudia Kr&auml;h

Gunter-Rudolf Schröder

Bernd Dirks

Claudia Kräh

Disclosed are bisazo compounds of the formula Ia or Ib

Bisazo dyestuffs based on hydroxynaphthalene carboxylic acid

Azoxy dyes of the general formula I in the form of the free acidwhere

Azoxy dyes and copper complexes thereof

Described is a triarylmethane dye of the formula I where Rand Rare independently methyl, ethyl or hydroxyethyl, Q is substituted or unsubstituited phenyl or naphthyl and Ais the equivalent of an anion. It does not detach carcinogenic Michler's ketone.

Triarylmethane dyes

Preparation of liquid formulations of basic azo dyes

Azoxy dyes and their Cu complexes

Paper, board and cardboard are produced by a process in which a paper stock is drained in the presence of condensates of basic amino acids with sheet formation. In particular, homo- and cocondensates of lysine and the crosslinked condensates obtainable therefrom by reaction with crosslinking agents are used in amounts of from 0.01 to 5% by weight, based on dry paper stock, as a means of increasing the dry and wet strength and the absorptivity of paper, for fixing anionic dyes and interfering substances in the paper, for increasing the drainage rate and the retention as well as the efficiency of synthetic anionic and cationic retention aids in the production of paper, board and cardboard by draining a paper stock with sheet formation.

Method of producing paper, paperboard and cardboard

Cationic azo-dyes

Cationic azo dyes of the formula I ##STR1## where the variables are as defined in the specification, amines as their intermediates, processes for preparing them, their use for dyeing and printing natural or synthtic substrates, and their mixtures are described.

Cationic azo dyes based on aminobenzoic acid

Cationic sulfonic acid dyes of the formula I ##STR1## where the variables are as defined in the specification, are useful for the dyeing or printing of polymeric material.

Cationic sulfonic acid dyes

Paper, board and cardboard are produced from paper stocks containing foreign substances by drainage in the presence of a polymer which contains, as typical polymerized constituents, units of the formulae ##STR1## where R.sup.1 and R.sup.2 are each H, C.sub.1 -C.sub.3 -alkyl, and which have K values of not less than 130, the polymers containing less than 10 mol % of units of the formula II.

Production of paper, board and cardboard from paper stocks containing

Growing community of inventors

Maxdorf, Germany

Rainer Tresch