The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 1982
Filed:
Apr. 04, 1980
Enrico Albizzati, Arona, IT;
Enzo Giannetti, Novara, IT;
Montedison, S.p.A., Milan, IT;
Abstract
New and improved catalysts for polymerizing alpha-olefins of formula CH.sub.2 .dbd.CHR in which R is a C.sub.1 to C.sub.6 alkyl, more particularly propylene, mixtures of the alpha-olefins, and mixtures thereof with ethylene are disclosed. The catalysts are prepared from 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 an organic or inorganic oxygenated acid. The improvement consists in providing catalysts prepared from components (a) and (b) as defined infra and component (b) of which includes an alkyl Al compound as defined in (b) in amounts equal to 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 stereospecific 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-donor compound complexed with the Al alkyl compound.