| 摘要 |
Improved catalyst and method for the manufacture of polyethylene comprising a catalyst based on a solid substance containing titanium, magnesium and chlorine activated by aluminum alkyls or reaction products of dialkyl aluminum hydrides with diolefins having from 4 to 20 carbon atoms, and its use in the manufacture of polyethylene where said solid substance is produced by (1) reacting metallic magnesium with at least 2 mols of allyl chloride and at least 1.75 mols of a di-lower alkyl ether, per gram-atom of magnesium at a temperature between about 30 DEG C and about 100 DEG C, (2) aging the solid reaction product for at least 10 hours at a temperature between about 30 DEG C and about 140 DEG C, (3) treating the solid reaction product either together, or subsequent to the aging step, with at least 0.2 mols of a di-lower alkyl sulfite, per gram-atom of magnesium, (4) reacting the aged and treated solid reaction product with at least 0.
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