Spherical particles
View Patent ↗Spherical particles comprising magnesium alcoholate and having a poured cone height of less than 17 mm are prepared by reacting magnesium, an alcohol or a mixture of various alcohols and a halogen and/or an optionally organic halogen compound with one another at below the boiling point of the alcohols. The spherical particles are employed as a precursor for olefin polymerization catalysts.
1. Spherical particles comprising a mixture of magnesium alcoholates, wherein said particles have sufficient flowability so as to exhibit a poured cone height of less than 17 mm.
2. Spherical particles according to claim 1 , wherein magnesium ethanolate is the main constituent.
3. Spherical particles according to claim 1 having the composition:
magnesium ethanolate>80 wt. %,
magnesium methanolate 0.001-15 wt. %,
magnesium isopropanolate 0.001-10 wt. %
halogen or halogen containing compound 0.001-10 wt. %.
4. A process for the preparation of the spherical particles according to claim 1 , comprising reacting magnesium, an alcohol or a mixture of various alcohols and a halogen and/or halogen containing compound with one another at below the boiling point of the alcohol having the lowest boiling point, and separating the resulting the product obtained.
5. The process according to claim 4 , further comprising drying the product.
6. The process of claim 4 wherein the halogen compound is an organic acid halide.
7. The process of claim 6 wherein the organic acid halide is chloroacetyl chloride.
8. A method for olefin polymerization comprising carrying out polymerization of an olefin in the presence of the spherical particles of claim 1 .