C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2024, 23/381
C08F 2/20 (2006.01) B01J 19/18 (2006.01) C08F 14/06 (2006.01)
Patent
CA 1215500
- 1 - ABSTRACT OF THE DISCLOSURE The process described is carried out in at least two reaction zones, plug flow of the polymerization mixture being maintained in all the reaction zones. In the first reaction zone, polymerization is carried to a conversion of not more than 10 % and, in the course thereof, the polymerization mixture is agitated suffi- ciently to establish the desired particle size morphology, preferably at a stirring energy per unit volume of 0.1 to 5 kWm-3. Particularly in the second reaction zone, the formation of polymer incrustations on the surfaces coming into contact with the polymerization mixture is prevented, preferably by ensuring that the polymerization mixture comes exclusively into contact with smooth, non-metallic surfaces. The device preferably comprises three reac- tors, all of which have a length/diameter ratio of at least 4, the first reactor standing in a vertical position and the other two reactors being in an approximately horizontal position. This makes it possible to manu- facture, over a long period, vinyl chloride polymers at good space-time yields and with a constant and good pattern of properties and a narrow particle size distri- bution.
383291
Engelmann Manfred
Klippert Heinz
Paschalis Stratos
Tzschoppe Eberhard
Weinlich Jurgen
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Hoechst Aktiengesellschaft
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