| abstract |
The catalysts, for polymerisation of ethylene and alpha-olefins, are organometallic compounds of Gps. I, II and III, or halides of sub gps. IV, V, VI and VIII of the periodic system. They are precipitated preferably on the granular polyethylene for ethylene polymerisation. An example of catalyst is a combination of Ti, V and Al compounds which are precipitated on polyethylene powder. |