Magnesium dichloride-ethanol adducts and catalyst components obtained therefrom

Abstract

A MgCl 2 .mEtOH.nH 2 O adducts, where 3.4<m≦4.4, 0≦n≦0.7, characterized by an X-ray diffraction spectrum, taken under the condition set forth above, in which, in the range of 2θ diffraction angles between 5° and 10°, at least two diffraction lines are present at diffraction angles 2θ of 9.3±0.2°, and 9.9±0.2°, the most intense diffraction lines being the one at 2θ of 9.3±0.2°, the intensity of the other diffraction line being less than 0.4 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/or porosity with respect to the catalysts prepared from the adducts of the prior art.

1 - 24 . (canceled) 
   
   
       25 . A catalyst component for polymerizing olefins comprising a product of a reaction between a transition metal compound and a partially dealcoholated MgCl 2 -ethanol adduct obtained by partial dealcoholation of a MgCl 2 .mEtOH.nH 2 O adduct, wherein 3.4≦m≦4.4 and 0≦n≦0.7, the MgCl 2 .mEtOH.nH 2 O adduct having an X-ray diffraction spectrum comprising at least one diffraction line at each diffraction angle 2θ of 9.3±0.2° and 9.9±0.2° with each diffraction angle being between 5° and 10°, the diffraction line at diffraction angle 2θ of 9.3±0.2° being more intense than the diffraction line at diffraction angle 2θ of 9.9±0.2°, and the diffraction line at diffraction angle 2θ of 9.9±0.2° being less than 0.4 times as intense as the diffraction line at diffraction angle 2θ of 9.3±0.2°. 
   
   
       26 . The catalyst component according to  claim 25 , wherein the partially dealcoholated MgCl 2 -ethanol adduct contains from 0.1 to 3 moles of ethanol per mole of MgCl 2 . 
   
   
       27 . The catalyst component according to  claim 26 , wherein the partially dealcoholated MgCl 2 -ethanol adduct has a porosity ranging from 0.05 to 2 cc/g. 
   
   
       28 . The catalyst component according to  claim 26 , wherein the partially dealcoholated MgCl 2 -ethanol adduct contains from 1 to 3 moles of ethanol per mole of MgCl 2  and a porosity ranging from 0.15 to 1.5 cc/g. 
   
   
       29 . A catalyst for polymerizing olefins comprising a product of a reaction between a catalyst component, which comprises a product of a reaction between a transition metal compound and a partially dealcoholated MgCl 2 -ethanol adduct obtained by partial dealcoholation of a MgCl 2 .mEtOH.nH 2 O adduct wherein 3.4≦m≦4.4 and 0≦n≦0.7, the adduct having an X-ray diffraction spectrum comprising at least one diffraction line at each diffraction angle 2θ of 9.3±0.2° and 9.9±0.2° with each diffraction angle being between 5° and 10°, the diffraction line at diffraction angle 2θ of 9.3±0.2° being more intense than the diffraction line at diffraction angle 2θ of 9.9±0.2°, and the diffraction line at diffraction angle 2θ of 9.9±0.2° being less than 0.4 times as intense as the diffraction line at diffraction angle 2θ of 9.3±0.2°, and an organoaluminum compound. 
   
   
       30 . A process for polymerizing olefins of formula CH 2 ═CHR 4 , wherein R 4  is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising a catalyst for polymerizing olefins comprising a product of a reaction between a transition metal compound and a partially dealcoholated MgCl 2 -ethanol adduct obtained by partial dealcoholation of a MgCl 2 .mEtOH.nH 2 O adduct wherein 3.4≦m≦4.4 and 0≦n≦0.7, the adduct having an X-ray diffraction spectrum comprising at least one diffraction line at each diffraction angle 2θ of 9.3±0.2° and 9.9±0.2° with each diffraction angle being between 5° and 10°, the diffraction line at diffraction angle 2θ of 9.3±0.2° being more intense than the diffraction line at diffraction angle 2θ of 9.9±0.2°, and the diffraction line at diffraction angle 2θ of 9.9±0.2° being less than 0.4 times as intense as the diffraction line at diffraction angle 2θ of 9.3±0.2°, and an organoaluminum compound.