Process for the manufacture of ethylene polymers

• Main Authors: OEDER, DIETER, BRANDSTETTER, FRANZ, WERNER, MICHAEL, ZENTGRAF, ERNST, ZIEGLER, WALTER
• Format: Patent
• Language: English; French; German
• Published: 07.03.1984
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

Die Erfindung betrifft ein Verfahren zur Herstellung von Ethylenpolymerisaten durch Homo- oder Copolymerisation von Ethylen in einer Polymerisationszone bei Drücken von 500 bis 5 000 bar und Temperaturen von 50 bis 450°C, indem man dem Polymerisationssystem an dessen Einlaßstelle ein Gemisch aus Ethylen, Regler und gegebenenfalls radikalisch zerfallender Initiator und/oder Comonomer und gleichzeitig an mindestens einer Stelle des Polymerisationssystems radikalisch zerfallenden Initiator zuführt, wobei separate Zufuhr des Initiators in Lösung durch schnell laufende Pumpen erfolgt. 1. A process for the production of ethylene polymers by homopolymerization of ethylene or copolymerization of ethylene with other compounds which are copolymerizable with ethylene, in a polymerization zone at a pressure of from 500 to 5,000 bars and a temperature of from 50 to 450 degrés C in the presence of a polymerization initiator which decomposes into free radicals, a mixture of ethylene, regulator and, if desired, initiator and/or any comonomer being fed into the polymerization system at its inlet, and initiator being simultaneously fed into the polymerization system at at least one other point, wherein the separate feeding of the initiator in solution is effected by means of a high-pressure piston pump where the number of strokes is higher than 60 per minute.