C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
252/109, 402/418
C08F 4/16 (2006.01) C08F 4/02 (2006.01) C08F 10/00 (2006.01)
Patent
CA 1137067
ABSTRACT OF THE DISCLOSURE New and improved catalysts for polymerizing alpha- olefins of formula CH2 = CHR in which R is a C1 to C6 alkyl, more particularly propylene, mixtures of the alpha- olefins, and mixtures thereof with ethylene are disclosed. The catalysts are prepared form Al alkyl compounds and a solid product including a Mg dihalide and reaction products of said halide with at least one Ti compound and an electron donor compound which is an ester of and organic or inorganic oxygenated acid. The improvement consists in providing catalysts prepared from components (a) and (b) molar ratios between the alkyl Al compound and the Ti compound of component (a) in the range of from 1 to 30, preferably from 2 to 20, and in which if the alkyl Al compound is complexed with an electron donor compound, the latter is used in reduced amounts such that at least 85% of the alkyl Al compound is in a form not combined with an electron donor compound, i.e., catalysts which are highly active and highly sterospecific but which involve a lower consumption of alkyl Al compound with respect to the Ti compound than has been required in the case of various prior art catalysts and which make it possible to use a lower amount of electron donors compound complexed with the Al alkyl compound.
321122
Albizzati Enrico
Giannetti Enzo
Macrae & Co.
Montedison S.p.a.
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