CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Stage application under 35 U. S.C. § 371 of International Application PCT/EP2018/079565 (published as WO 2019/105667 A1), filed Oct. 29, 2018, which claims the benefit of priority to Application EP 17204062.8, filed Nov. 28, 2017. Benefit of the filing date of these prior applications is hereby claimed. Each of these prior applications is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a magnesium compound, a method for preparing the same and use thereof as a solid pre-catalyst component for olefin polymerization.

BACKGROUND

High bulk density, regular shape and uniformity in particle size distribution are desirable properties for polymer resins to provide good flowability during resin extrusion, faster extrusion rates, easier handling and transportation advantages. These desirable properties of polymer resins are usually affected by the properties of a catalyst used for preparing the polymer resins, in particular by the properties of the solid catalyst as well as of the catalyst support.

Magnesium alkoxide has been widely used as a catalyst support for polymerization catalysts in particular Ziegler-Natta type catalysts and there are many studies to improve the properties of magnesium alkoxide.

U.S. Pat. No. 7,754,640B2 discloses a method of producing a magnesium composition by reacting metal magnesium, e ol, an alcohol having from 3 to 10 carbon atoms and halogen.

US2013/0196847A1 discloses a dialkoxy magnesium carrier prepared by the reflux reaction of magnesium, mixed alcohols and mixed halogenated agents in inert atmosphere.

WO 2005/044873 discloses a method for synthesizing spherical magnesium alkoxide particles by reacting magnesium with an alcohol mixture at a temperature below the boiling point of the mixture.

The spherical magnesium alkoxide particles synthesized by the methods are rather frangible and do not retain their morphology or particle size during the synthesis of Ziegler Natta procatalyst, especially when the procatalyst synthesis is carried out on a large scale. Further, the particle size distribution of the alkoxide particles synthesized by the above mentioned methods need improvement.

It is therefore an object of the present invention to provide a magnesium compound, a method for producing a magnesium compound and a solid pre-catalyst for olefin polymerization comprising the magnesium compound overcoming drawbacks of the prior art, in particular to provide a method of producing a .magnesium compound having high bulk density and an improved morphology, the method allowing control of the particle size and the size distribution.

