Basf Aktiengesellschaft

Rainer Nachtrab

Peter Ittemann

Sven Grabowski

Norbert G&uuml;ntherberg

Bernhard Czauderna

Jurgen Hofmann

Horst Baumgartl

Gerd Ehrmann

Rudolf Polster

Hilmar Ohlig

Heino Thiele

Juergen Pfister

Andreas Kleinke

Friedrich Goffing

Peter Barghoorn

J&uuml;rgen Hofmann

Michael Schiessl

Wolfgang Fath

Joerg Kroker

Hartmut Heinen

Alois Schlarb

Karl-Ludwig Brentrup

Alexander Ludwig

Shear forces are used for essentially salt-free coagulation of plastics dispersions or rubber dispersions. For this, method of use is made of an apparatus with at least one shearing module which has a stator and a rotor arranged within the stator, where the surfaces facing toward one another in the stator and in the rotor are in each case smooth, or at least the rotor exhibits a structure formed on its surface and facing from this in the direction of the stator, and between the stator and the rotor there is a gap of predetermined gap width. The process is carried out by passing the dispersion to be coagulated through the gap between stator and rotor and precipitating the dispersion by rotation of the rotor with predetermined shear rate and shear deformation.

Method for coagulating plastics dispersions using a device with shearing elements

Semi-finished GMT sheet material of GMT recyclate in which more than 50% by weight of the glass fibers are more than 2 mm in length and which is produced by extruding GMT recyclate particles without significant comminution of the glass fibers.

GMT sheet material produced from GMT recyclate

Aqueous non-self-emulsifying polymer dispersions having small particles and a long shelf life and based on highly viscous reaction resins are prepared without the addition of solvents, by means of an intensively dispersing screw apparatus, by a continuous process in which the preparation of the polymer dispersion is carried out in an intensive shear zone of the screw apparatus, the water/reaction resin ratio in this intensive shear zone corresponding to the phase inversion point or being close to it, and the specific energy supply is 0.01-0.15 kWh/kg, the residence time is 0.1-60 sec and the shear gradient is 2,000-20,000 sec.sup.-1.

Continuous preparation of aqueous non-self-emulsifying polymer

1-Hydroxyanthraquinones are prepared in an improved process by reacting phthalic anhydride or derivatives thereof with phenol derivatives in the presence of a Lewis acid as catalyst and in the presence or absence of a diluent, wherein the improvement comprises conducting the reaction in a self-cleaning apparatus having a mixing effect, at a temperature of from 120.degree. C. to 300.degree. C. for from 5 to 1,000 seconds, the self-cleaning apparatus having a mixing effect subjecting the reactants to a shear gradient of from 50 to 20,000 sec.sup.-1 with an energy input of from 0.01 to 0.2 kwh/kg of reactants.

Preparation of hydroxyanthraquinones

Crude copper phthalocyanines are transformed into a pigmentary state by treating finely divided but imperfectly crystallized and highly aggregated crude copper phthalocyanines having a primary particle size, produced by ball milling, or less than 0.1 .mu.m with an organic solvent by subjecting a suspension of the organic solvent and the milled crude copper phthalocyanine (hereinafter referred to as the solvent/pigment suspension), which has a pigment concentration of from 15 to 55% by weight and a solvent concentration of from 15 to 85% by weight and which may contain water in a concentration of from 0 to 30% by weight, to a shear gradient of from 1000 to 20000 s.sup.-1 for a period of from 2 to 1000 s with an energy uptake during shearing of from 0.01 to 0.02 kWh/kg of pigment throughput, then metering water into the solvent/pigment suspension in an amount of from 0.1 to 10 times the amount of the solvent, to effect a defined discontinuation of the conditioning process, and finally mixing the suspension until homogeneous.

Transforming crude copper phthalocyanines into a pigmentary state

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Ludwigshafen, Germany

Rainer Nachtrab