Catalyst for the polymerization of olefins

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...

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502119, 502120, 502131, 526114, 526116, 526127, 526133, 526137, 526139, 526140, 526141, 526142, B01J 3100

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active

053489250

ABSTRACT:
A solid component of catalyst, active in the polymerization of propylene and other .alpha.-olefins in stereoregular polymers, is obtained:
(i) by treating a non-activated silica support in particles with a tin tetrahalide, to at least partially block the hydroxylic groups of the silica and to obtain a blocked silica;
(ii) by impregnating the blocked silica with magnesium dialkyl or magnesium alkyl halide to make the magnesium compound react with the tin compound and with possible residual hydroxylic groups of the silica and to obtain a support;
(iii) by halogenating the support by contact with a halogenating agent selected from the halides of tin, antimonium or silicon to obtain a halogenated support;
(iv) by titanating the halogenated support with an excess of a titanium tetrahalide to obtain a titanated support;
(v) by putting the titanated support in contact with a Lewis base, to obtain a solid component of catalyst.

REFERENCES:
patent: 4252670 (1981-02-01), Caunt et al.
patent: 4301029 (1981-11-01), Caunt et al.
patent: 4471066 (1984-09-01), Sakurai et al.
patent: 5006620 (1991-04-01), Zolk et al.

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