Process for the preparation of polyethylene in accordance with the high pressure, high temperature processes which use a catalyst of the ziegler type

Abstract From the Canadian patent

The present invention relates to a process for the continuous polymerisation and copolymerisation of ethylene under a pressure higher than 500 bars and at temperatures higher than about 160°C in the presence of a catalyst containing a derivative of a transition metal and an organic derivative of aluminium,wherein there is injected into the reaction mixture at the end of reaction at least one alkali metal salt or alkaline earth metal salt of a carboxylic acid,in an amount sufficient to bring about the deactivation of the catalyst, said salt being so chosen that its reaction products with the constituents of the catalyst remain in the polymer.