Bayer Aktiengesellschaft

Pluess-staufer Ag

Bernhard A Wolf

Werner Obrecht

Gerd Sylvester

Rudolf Casper

Wolfgang Baade

Kurt-Peter Meurer

Bernhard Will

Hugo Zimmermann

Lutz Tschersich

Klaus Weinmann

In a process for industrial fractionation of polymers using an extraction column and a homogeneous extraction agent a homogeneous feed is supplied to a region of the extraction column which is nearer the upper end thereof when the feed has a greater density than the extraction agent and which is nearer the lower end thereof when the feed has a lower density than the extraction agent. An apparatus for carrying out this process consists advantageously, instead of a pulsed sieve plate column as hitherto, of an unpulsed filling body column which leads to a better separation because a back mixing is avoided in favourable manner.

Process and apparatus for industrial fractionation of polymers

High molecular weight, gel-free ethylene/vinyl acetate copolymers may be prepared by the process of solution polymerization if a particular relationship of temperature/pressure is observed.

Solution polymerization for the preparation of gel-free ethylene/vinyl

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Mainz, Germany

Bernhard A Wolf