Evonik Roehm Gmbh

Roehm Gmbh & Co Kg

Evonik Rohm Gmbh

Ruediger Carloff

Joachim Heid

Heinz Vetter

Hermann Siegert

Udo Gropp

Jochen Ackermann

Roger Recktenwald

Horst Hiltner

Olaf Pickenaecker

Hans-Rolf Rausch

Ingrid Lunt-Rieg

The invention relates to novel poly(meth)acrylates for producing moulding compositions. In particular, the invention relates to novel methacrylates having ester groups which, in the cleavage process, liberate at most only a very small amount of components which are not re-copolymerizable. Copolymerization of monomers of this type in the production of the novel poly(meth)acrylates for moulding compositions brings about only minimal alteration of the heat resistance of these materials or may indeed improve the same.

Homopolymers and copolymers of hydroxyisobutyric acid (ester) (meth) acrylates

The invention relates to a vented extruder () for the devolatilization of a polymer material, encompassing at least one extruder barrel () with at least one rotatably driven extruder screw () mounted in the extruder barrel (), and with at least one material feed and with at least one extrudate outlet, and also with at least one vent zone (). A particular feature of the vented extruder () is that the gas output for the gas arising in the vent zone () has been provided upstream of the material feed, in relation to the direction of conveying of the polymer material.

Degassing extruder for degassing a polymer material and method for degassing a syrup consisting of polymers, solvents and/or monomers using a degassing extruder

The invention relates to a vented extruder () for the devolatilization of a polymer material. The vented extruder () encompasses at least one drive (), at least one gearbox (), at least one rotatably driven extruder screw (), at least one first material feed () and at least one extrudate outlet (). A feature of the vented extruder () according to the invention is that the drive, encompassing drive () and gearbox (), has been provided in the region of that end of the extruder screw () that is downstream in relation to the direction of conveying of the polymer.

Drive arrangement in a degassing extruder

The invention relates to a stirred-tank reactor and to a method for carrying out a polymerization reaction of unsaturated monomers using a stirred-tank reactor. According to the invention, said stirred-tank reactor is characterized in that the product discharge point is designed as the central base outlet that is at least partially traversed by the agitator shaft. Said polymerization is performed continuously under positive pressure, so that the stirred-tank reactor is operated hydrodynamically.

Stirred-tank reactor and method for carrying out a polymerisation reaction using said type of stirred-tank reactor

The invention relates to a process for continuous preparation of alkyl (meth)acrylates by transesterification of methyl (meth)acrylate using alcohols which are high-boiling relative to methanol. A particular workup technique achieves product qualities which have hitherto not been attained. Very high space-time and overall yields can also be achieved.

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Darmstadt, Germany

Ruediger Carloff