Basf Aktiengesellschaft

Rainer Klostermann

Wolfgang Fischer

Hermann Gausepohl

Christian Schade

Philippe Desbois

Volker Warzelhan

Guiscard Gl&uuml;ck

Alain Deffieux

Peter Barghoorn

Michel Fontanille

Bradley Ronald Morrison

Walter Kastenhuber

Thomas Hauff

Joachim Birk

Hubertus Kr&ouml;ner

Holger Sch&ouml;pke

Wolfgang Klanig

Huberrus Kr&ouml;ner

Preparation of emulsion homo- and copolymers and device therefore

The invention relates to a process for the drying of coagulated water-containing rubber particles. These are treated with an aqueous solution of any desired substances in monodisperse solution in water in such a way that, at least for some period, the surface of the rubber particles is completely covered by the aqueous solution. It is preferable to use an aqueous solution of substances selected from the group consisting of salts, alcohols, acids and sugars. This method can reduce the internal water content between the particles resulting from coagulation, without major usage of energy or time.

Drying of coagulated water-containing rubber particles

A method of on-line monitoring and control of monomer conversion in emulsion polymerization includes continuously balancing, as from an initialization time, the heat Q , introduced into the reactor, the reaction enthalpy Q introduced via the monomer feed, and the heat which has been removed from the reactor Q , and calculating an amount of heat which has not been removed Q which would lead to an increase in the internal temperature and the internal pressure of the reactor in the event of a spontaneous adiabatic reaction. A check is carried out as to whether the potential adiabatic temperatures and pressures always lie below prescribed upper limits. If the upper limits are exceeded, the monomer feed to the reactor is throttled back or interrupted.

Method for continuously monitoring and controlling the monomer conversion during emulsion polymerization

In a process for the homopolymerization of vinylaromatic monomers or the copolymerization of vinylaromatic monomers and dienes, the monomers are polymerized in the presence of at least one alkali metal organyl, at least one magnesium organyl and at least one aluminum organyl. The invention also provides an initiator composition for carrying out the process.

Method for retarded anionic polymerization

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Ketsch, Germany

Rainer Klostermann