| 摘要 |
Improved solid catalysts for the polymerization of 1-olefins, comprising a titanium halide deposited on magnesium halide are obtained by contacting in hydrocarbon solution at 10 to 100 DEG C, a magnesium salt of an aliphatic carboxylic acid containing at least six carbon atoms with a C2-C20 alkylaluminum dichloride, the mole ratio of A1:Mg being at least 2:1, a temperature of from about 10 DEG C to about 100 DEG C, separating magnesium chloride particles and washing them with a hydrocarbon solvent until they are substantially free of chloride and unadsorbed aluminum compounds, contacting the washed particles with an electron donor, washing the donor-treated particles with a hydrocarbon solvent, and washed particles with a titanium halide, thereby effecting depositing titanium halide on the magnesium chloride particles, the electron donor being a C4-C24 aliphatic ether, C3-C4 cyclic ether, C7-C15 aromatic ether, C4-C24 alkyl ester of a fatty acid, C8-C24 alkyl ester of an aromatic acid, C1-C12 aliphatic amine, C4-C6 cyclic amine, C6-C10 aromatic amine, C1-C18 aliphatic alcohol, C7-C15 aromatic alcohol, C6-C10 phenol, C6-C18 aliphatic or aromatic phosphine or C6-C12 aliphatic sulfide.
<??>The catalysts exhibit high stereospecificity and are so active that the quantity used is so small it is not necessary to separate them from the polymer obtained. |
