Catalysts for polymerizing olefins

Details Catalysts for polymerizing olefins Catalysts for polymerizing olefins

C - Chemistry, Metallurgy

08

F

252/109

C08F 4/16 (2006.01) C08F 10/00 (2006.01)

Patent

CA 1096365

ABSTRACT OF THE DISCLOSURE A process for producing titanium trichloride-based catalysts, which can be used for the polymerisation of alpha-olefins, which comprises reducing titanium tetrachoride in excess by an organo-aluminium compound, then maturing the formed precipitate in the medium in which it was formed, the process being characterised in that: - the ratio between the number of mols of titanium tetrachloride and the number of organic gram equival- ents of the organo-aluminium compound is from 1.2 to 1.8 and preferably from 1.3 to 1.6; - the organo-aluminium compound comprises a compound having the formula AIRnX3-n' in which R is an alkyl, cycloalkyl, aryl or aralkyl group containing from 1 to 12 carbon atoms, X is a hydrogen atom or a hal- ogen atom, preferably chlorine or bromine, and n is an integer or a fraction capable of being of any value of from 1 to 3 and preferably from 1.5 to 3; - the process is performed in the presence of from 2 to 5 mols per mol of organo-aluminium compound, of one or more aliphatic ethers having the form- ula R'-O-R" in which R' and R" are alkyl groups containing from 1 to 5 carbon atoms; - the reduction of the titanium tetrachloride is effected at - 10 to 80°C and preferably from 10 to 60°C; - maturing of the precipitate is effected at from 80 to 115°C and preferably from 1 hour to 4 hours. period of from 15 minutes to 24 hours and preferably from 1 hour to 4 hours,

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