Catalyst components for the polymerization of olefins

C - Chemistry – Metallurgy – 08 – F

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C08F 4/651 (2006.01) C08F 4/654 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2396232

The present invention relates to catalyst components for the polymerization of olefins comprising Mg, Ti, halogen and at least two electron donor compounds, said catalyst component being characterized by the fact that at least one of the electron donor compounds, present in an amount from 20 to 50% by mol with respect to the total amount of donors, is selected from esters of succinic acids which are not extractable, for more than 25% by mol and at least another electron donor compound which is extractable, for more than 35%. The said catalyst component are capable to give polymers with high xylene insolubility, high stereoblock content and broad MWD suitable for making the polymers usable in the BOPP sector.

Constituants de catalyseur pour la polymérisation d'oléfines, qui comprennent Mg, Ti, halogène et au moins deux composés donneurs d'électrons, ce dernier constituant étant caractérisé en ce qu'au moins un des composés donneurs d'électrons, présent à raison de 20 à 50 % par mole par rapport à la quantité totale des donneurs, est choisi parmi les esters d'acides succiniques qui ne sont pas extractibles pour plus de 25 % par mole et en ce qu'au moins un autre composé donneur d'électrons est extractible pour plus de 35 %. Lesdits constituants de catalyseur permettent d'obtenir des polymères à haute insolubilité au xylène, à haute teneur en stéréoséquences et à large répartition du poids moléculaire, ce qui permet de produire des polymères pouvant être utilisés dans le secteur des films de polypropylène bi-orientés.

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