| 摘要 |
<p>A catalyst support is prepd. under an inert atmosphere by (1) dissolving R2Mg, where R is 2-20C alkyl, in a hydrocarbon solvent and opt. an electron donor; (2) dissolving Rn' ALX3-n, where R' is 1-20C alkyl, X is CL or Br and n is 1 or 2, in a hydrocarbon solvent and opt. an electron donor; (3) contacting the solns. of (1) and (2) at -65 to 30 degrees C for 0.5-5 hrs.; (4) isolating the obtd. suspended Mg halide particles of size 0.05-80 microns; (5) washing the particles with a hydrocarbon solvent until free of halide and residual AL cpds., and (6) contacting them with an electron donor before and/or after the washing. Step (6) can be omitted when an electron donor is used in (1) or (2). The solvent is a 5-12C aliphatic, 5-12C monocyclic cycloaliphatic or 6-12C monocyclic aromatic hydrocarbon. The electron donor is a 4-24C aliphatic, 3.4C cyclic, or 7-15C aromatic ether, fatty acid 4-24C alkyl ester, aromatic acid 8-24C alkyl ester, 1-12 Caliphatic, 4-6C cyclic or 6-10C aromatic amine, 1-18C aliphatic or 7-15C aromatic alcohol, 6-10C phenol, 6-18C aliphatic or aromatic phosphine or 6-12C aliphatic sulphide. A Ti halide may be deposited on the support and the catalyst used for the polymerisation of 1-olefins, e.g. propylene, giving high rates and mileages and good stereospecificity.</p> |
