US 5,965,478 A · Solid catalyst component and catalyst for polymerization of olefins

Abstract

A solid catalyst component for polymerization of olefins prepared by reacting a titanium halide, a diester of aromatic dicarboxylic acid and a dialkoxymagnesium having a bulk density of at least 0.25 g/ml and an average particle size of 1 to 100 .mu.m. The average rate of temperature rise from the temperature at which the titanium halide is allowed to come in contact with the dialkoxymagnesium to the temperature at which the reaction is initiated is in a range of from 0.5 to 20.degree. C./min. Such catalyst can further comprise an organic aluminum compound and an organic silicon compound. The use of said catalyst makes it possible to efficiently obtain a polyolefin having a high stereoregularity, a high bulk density and excellent particle properties.

Claims16

Dependent claims

A solid catalyst component for polymerization of olefins, prepared by allowing the following components (a), (b) and (c) to come in contact and react with one another:

(a) a dialkoxymagnesium in powder form having a bulk density of from 0.25 to 0.40 g/ml and an average particle size of from 1 to 100 .mu.m;
(b) a titanium halide represented by the general formula:
Ti(OR.sup.1).sub.n X.sub.4-n, wherein R.sup.1 represents a C.sub.1-4 -alkyl group, X represents a chlorine, bromine or iodine atom, and n represents 0 or an integer of from 1 to 3;
and
(c) a diester of an aromatic dicarboxylic acid;
wherein the average rate of heat rise from the temperature at which the component (b) is allowed to come in contact with the component (a) to the temperature at which their reaction is initiated is in a range of from 0.5 to 20.degree. C./min.

3 more elements

A solid catalyst component for polymerization of olefins, prepared by allowing the following components (a), (b) and (c) to come in contact and react with one another:

(a) a dialkoxymagnesium in powder form having a bulk density of from 0.25 to 0.40 g/ml and an average particle size of from 1 to 100 .mu.m, said dialkoxymagnesium being prepared by the steps of (i) continuously or intermittently adding metallic magnesium and an alcohol to a reaction composition under reflux of said alcohol so that they are reacted, and (ii) keeping the resulting reaction product under reflux of said alcohol for 1 to 30 hours, in the presence of a catalyst;
(b) a titanium halide represented by the general formula:
Ti(OR.sup.1).sub.n X.sub.4-n, wherein R.sup.1 represents a C.sub.1-4 -alkyl group, X represents a chlorine, bromine or iodine atom, and n represents 0 or an integer of from 1 to 3;
and
(c) a diester of an aromatic dicarboxylic acid.

2 more elements

Dependencies are inferred from the claim text.

Solid catalyst component and catalyst for polymerization of olefins

Life of this patent

Solid catalyst component and catalyst for polymerization of olefins

Life of this patent

Abstract

Claims16