| 摘要 |
An a -olefine is polymerized in bulk at a temperature of at least 175 DEG C. and a pressure of at least 500 atmospheres and using as catalyst a Ziegler-type complex in amount between 25 and 500 parts by weight per 1,000,000 parts by weight of the olefine. The catalyst may be as described in Specification 799,392 and is preferably formed from a titanium halide and an aluminium trialkyl. The olefines specified are ethylene (preferably pure), ethylene-containing gas streams, propylene, butene-1, isobutylene, butadiene, isoprene and mixtures thereof. Other features described are a continuous polymerization process and the purification of polymer using water.
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