Basf Aktiengesellschaft

Basf Aktiwngesellschaft

Hilmar Ohlig

Jurgen Hofmann

Elmar Mailahn

Norbert Guntherberg

Sven Grabowski

Bernhard Czauderna

Klaus Bus

Andreas Deckers

Peter Ittemann

Karl-Peter Farwerck

Alois Schlarb

J Urgen Hofmann

Hans-Josef Sterzel

Hermann Gausepohl

Graham E McKee

Roger G Klimesch

Horst Reimann

Friedrich Seitz

Siegmund Besecke

Horst Baumgartl

Norbert Güntherberg

Jurgen Koch

Albin Berger

Juergen Hofmann

Rainer Nachtrab

Jürgen Hofmann

Karl-Ludwig Brentrup

Harald Kroeger

The present invention relates to a mixing apparatus at least composed of a screw-based machine Sand a screw-based machine S, where Shas heating equipment, at least in the plasticizing and homogenizing zone, and where the outlet from Shas been connected to the screw-containing barrel of S, within the plasticizing or homogenizing zone of S, a substantive feature of which is that the connection between Sand Sis brought about by a connector which has cooling equipment effective as far as the inner wall of the screw-containing barrel of S, and to a process for preparing thermoplastically processable molding compositions, in particular additive masterbatches, from at least one thermoplastic component Cand at least one component C, where the melting point or decomposition temperature Tof Cis lower, by at least about 50&#xb0; C., than the temperature T, which is the lower limit of the thermoforming range of C, and where most of Cis melted only after contact with C

Mixing apparatus having a cooled connector

Process for producing thermoplastics

Polymers essentially comprising units of the formula I ##STR1## in which R.sup.1 and R.sup.2 are hydrogen or methyl and

Imidation of polymers based on esters of methacrylic acid and acrylic

Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 50% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in a mixing unit, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating screws and essentially includes, in the transport direction,

Preparation of thermoplastics

Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 60% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in an extruder, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating, in each case double-flight, screws and essentially includes, in the transport direction,

Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 50% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in a mixing unit, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating, in each case triple-flight, screws and essentially includes, in the transport direction,

Toughened thermoplastics are prepared by mixing a water-moist elastomer component A containing up to 60% by weight of residual water with a thermoplastic polymer B and further polymers C and additives D in an extruder with mechanical dewatering of the elastomer component A, by a process in which the components A, B, C and D are fed to a twin-screw extruder which has corotating screws and essentially comprises, in the transport direction,

Essentially dry materials are obtained by mechanically dewatering water-moist rubber, prepared by emulsion polymerization and precipitation, to give a compact material having a rubber content of at least 50%, by a process in which the previously dewatered rubber is fed to the feed section of a twin-screw extruder which has screws rotating in the same direction and possesses, in succession in the conveying direction, at least two back-up zones and two associated dewatering orifices, each of which may be provided with a retaining screw, and at least one kneading zone, one devolatilization zone and finally one discharge zone, which may be closed by a die lip, and the water separated off is discharged at the dewatering orifices in liquid form.

Dewatering of water-moist graft rubber

Polyolefins are thermomechanically degraded in a twin-screw extruder without a downstream degradation apparatus, at from 300.degree. to 550.degree. C. and from 1 to 100 bar and in average residence times of the reaction mixture of from 0.5 to 10 minutes, by a process in which the pressure in the twin-screw extruder is changed periodically or aperiodically with a fluctuation of from 0.5 to 30 bar. The novel process is particularly suitable for the degradation of polypropylene.

Thermomechanical degradation of polyolefins

In a fiber composite plastic composed of plastic composition and fibers, the fibers have a pronounced fiber length distribution, in particular more than 50% by weight of the fibers have a length outside the range from 0.8.times.L to 1.2.times.L, where L is the mean (weight average) fiber length, and the mean fiber length is greater than the critical fiber length of the plastic composition/fiber system.

Plastic material, and process for the preparation thereof

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

Elastomeric thermoplastic molding materials contain

Growing community of inventors

Kaiserslautern, Germany

Hilmar Ohlig