Magnesium dichloride-alcohol adducts, process for their...

C - Chemistry – Metallurgy – 07 – F

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C07F 3/02 (2006.01) C08F 4/614 (2006.01) C08F 4/654 (2006.01) C08F 10/00 (2006.01) C08F 110/06 (2006.01)

Patent

CA 2257131

The present invention relates to MgCl2.cndot.mROH.cndot.nH2O adducts, where R is a C1-C10 alkyl, 2<=m<=4.2, 0<=n<=0.7, characterized by an X-ray diffraction spectrum in which, in the range of 2.THETA. diffraction angles between 5° and 15°, the three main diffraction lines are present at diffraction angles 2.theta. of 8.8 ~ 0.2°, 9.4 ~ 0.2° and 9.8 ~ 0.2°, the most intense diffraction lines being the one at 2.theta.=8.8 ~ 0.2°, the intensity of the other two diffraction lines being at least 0.2 times the intensity of the most intense diffraction line. Catalyst components obtained from the adducts of the present invention are capable to give catalysts for the polymerization of olefins characterized by enhanced activity and stereospecificity with respect to the catalysts prepared from the adducts of the prior art.

La présente invention concerne des produits d'addition MgCl2/.mROH/.nH2O, où R représente alkyle C1-C10, 2</=m</=4,2, 0</=n</=0,7, caractérisés par un spectre de diffraction des rayons X dans lequel, dans la gamme d'angles de diffraction 2 theta se situant entre 5 DEG et 15 DEG , les trois lignes de diffraction principales sont présentes au niveau d'angles de diffraction 2 theta de l'ordre de 8,8 +/- 0,2 DEG , 9,4 +/- 0,2 DEG et 9,8 +/- 0,2 DEG ; la ligne de diffraction la plus intense est celle se situant au niveau de l'angle 2 theta valant 8,8 +/- 0,2 DEG , l'intensité des deux autres lignes de diffraction étant d'au moins deux fois l'intensité de la ligne de diffraction la plus intense. Des constituants pour catalyseurs obtenus à partir des produits d'addition de la présente invention peuvent constituer des catalyseurs de polymérisation d'oléfines caractérisés par une activité et une stéréospécificité accrues par rapport aux catalyseurs préparés à partir des produits d'addition des techniques actuelles.

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