Magnesium Compound, Solid Catalyst Component, Olefin Polymerization Catalyst, and Method for Producing Olefin Polymer

Abstract

A magnesium compound obtained by reacting the following components (i) (ii) and (iii): (i) metal magnesium (ii) an alcohol (iii) a metal dihalide compound represented by the general formula (I) containing at least 0.001 mole of M relative to one mole of magnesium of the metal magnesium (i) MX 2   (I) where X is a halogen atom and M is Mn, Fe, Co or Zn.

1 . A magnesium compound obtained by reacting the following components (i), (ii) and (iii): 
 (i) metal magnesium    (ii) an alcohol    (iii) a metal dihalide compound represented by the general formula (I) containing at least 0.001 mole of M relative to one mole of magnesium of the metal magnesium (i)      MX 2   (I)    where X is a halogen atom and M is Mn, Fe, Co or Zn.    
   
   
       2 . The magnesium compound according to  claim 1 , wherein the metal dihalide compound (iii) is manganese dichloride.  
   
   
       3 . The magnesium compound according to  claim 1 , wherein the metal dihalide compound (iii) is iron dichloride.  
   
   
       4 . The magnesium compound according to  claim 1 , wherein the metal dihalide compound (iii) is cobalt dichloride.  
   
   
       5 . The magnesium compound according to  claim 1  which is obtained by reacting a halogen and/or a halogen-containing compound (iv) containing at least 0.0001 gram atom of a halogen atom relative to one gram atom of magnesium of the metal magnesium (i) in addition to the components (i), (ii) and (iii), 
 the halogen-containing compound not including the metal dihalide compound (iii)    
   
   
       6 . The magnesium compound according to  claim 5 , wherein the halogen (iv) is iodine.  
   
   
       7 . The magnesium compound according to  claim 5 , wherein the halogen-containing compound (iv) is magnesium dichloride.  
   
   
       8 . A solid magnesium compound which has an average particle diameter (D 50 ) of 50 μm or more, a sphericity (Sp) represented by the expression (1) of 1.60 or less and a smoothness (Sm) represented by the expression (2) of 120 or less:  
         Sp =( L   1   /L   2 ) 3   (1)  
     where L 1  is the longest diameter of a projection view of a magnesium compound particle determined by photographing with a scanning electron microscope and thereafter performing image-processing, and L 2  is the diameter of a circle which has an area equal to the projection area of the magnesium compound particle;  
         Sm =( L   3   /L   4 ) 3   (2)  where L 3  is the circumferential length of a projection view of a magnesium compound particle determined by photographing with a scanning electron microscope and thereafter performing image-processing, and L 4  is the circumferential length of an ellipse which has an area equal to the projection area of the magnesium compound particle and which is approximated to the profile of the magnesium compound particle such that when the magnesium compound particle is wrapped over the ellipse, the sum of the areas inside aid outside the profile of the ellipse among the sections surrounded by the profile of the magnesium compound particle and the profile of the ellipse becomes minimum.    
   
   
       9 . A solid magnesium compound which has an average particle diameter (D 50 ) of 50 μm or more, a sphericity (Sp) represented by the expression (1) of 1.60 or less, a depth of surface hollows (Lsh) of 3 μm or more, and a surface where small spheres connect with each other like a bunch of grapes:  
         Sp =( L   1   /L   2 ) 3   (1)  where L 1  is the longest diameter of a projection view of a magnesium compound particle determined by photographing with a scanning electron microscope and thereafter performing image-processing, and L 2  is the diameter of a circle which has an area equal to the projection area of the magnesium compound particle.    
   
   
       10 . A solid catalyst component obtained by reacting compounds comprising (a) and (b): 
 (a) the magnesium compound according to  claim 1     (b) a titanium compound represented by the general formula (II)      Ti(OR) n X 4-n   (II)    where X is a halogen atom, R is a hydrocarbon group having from 1 to 10 carbon atoms, a plurality of which are the same as or different from each other, and n is an integer of from 0 to 4.    
   
   
       11 . The solid catalyst component according to  claim 10  obtained by reacting the compounds further comprising (c) and or (d): 
 (c) a halide compound    (d) an electron donating compound.    
   
   
       12 . The solid catalyst component according to  claim 11 , wherein the halide compound (c) is silicon tetrachloride.  
   
   
       13 . A catalyst for olefin polymerization comprising 
 the solid catalyst component according to  claim 10 , and    an organometallic compound.    
   
   
       14 . A method of producing an olefin polymer comprising polymerizing an olefin in the presence of the catalyst for olefin polymerization according to  claim 13 .  
   
   
       15 . The catalyst as claimed in  claim 13 , further comprising an electron donating compound.  
   
   
       16 . A method of producing an olefin polymer comprising polymerizing an olefin in the presence of the catalyst according to  claim 15.