| 摘要 |
1,149,465. Polypropylene. CHEVRON RESEARCH CO. 20 Sept., 1967 [26 Sept., 1966], No. 42891/67. Heading C3P. In the polymerization of propylene using a catalyst comprising an organo-aluminium compound and a titanium compound in the presence of a hydrocarbon solvent, the polymerization is terminated by neutralizing the catalyst with an alkanol solution of an alkali metal alkoxide, the alkanol and alkoxide each containing from 1 to 6 carbon atoms, and the hydrocarbon solvent and alkanol are removed to leave polypropylene which is insoluble in boiling heptane and contains the neutralized catalyst. The catalyst is preferably a mixture of a dialkylaluminium chloride and titanium trichloride. The alkoxide and alkanol each preferably contain 1 to 3 carbon atoms and may be sodium or potassium methoxide and methanol; and the concentration of the alkanol solution of alkali metal alkoxide is preferably in the range of from 0À1 to 3 molar. In the examples, propylene is polymerized using a catalyst system comprising diethylaluminium chloride and titanium trichloride AA (3:1 mol ratio of TiCl 3 and AlCl 3 ), and termination is effected using either a sodium methoxide-methanol solution, or a sodium propoxide-propanol solution. The pentane, excess propylene and alkanol are removed by evaporation.
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