Propylene copolymer, polypropylene composition and uses thereof, transition metal compound and olefin polymerization catalyst

Abstract

An olefin polymerization catalyst having (A) a transition metal compound (2a) or (3a) and (B) at least one compound selected from (B-1) an organometallic compound, (B-2) an organoaluminum oxy compound and (B-3) a compound capable of forming an ion pair by reacting with the transition metal compound (A).

1 . A polyolefin resin composition comprising:
 100 parts by weight of a propylene polymer (PP-C) and   not less than 10 parts by weight of at least one elastomer selected from elastomers (EL-2) and (EL-4) obtainable by a metallocene catalyst,   wherein the elastomer (EL-2) is   I) a random copolymer of ethylene and an α-olefin having 4 to 20 carbon atoms in a molar ratio of constituent units derived from ethylene to constituent units derived from α-olefin of from 80/20 to 20/80, and has   II) an intrinsic viscosity [η] of not less than 1.5 dl/g,   III) a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn), as measured by gel permeation chromatography (GPC), of from 1.0 to 3.5, and   IV) a ratio of an irregularly bonded α-olefin monomer based on 2,1-insertion to all the α-olefin constituent units, as determined from a  13 C-NMR spectrum, of not more than 1.0 mol %; and   the elastomer (EL-4) is   I) a random copolymer of ethylene, propylene and an α-olefin having 4 to 20 carbon atoms in a molar ratio of constituent units derived from propylene to constituent units derived from α-olefin of from 80/20 to 20/80, and has   II) a molar ratio [(EP)/(OL)] of constituent units (EP) derived from ethylene and propylene to constituent units (OL) derived from α-olefin having 4 to 20 carbon atoms of from 99/1 to 20/80,   III) an intrinsic viscosity [η] of not less than 1.5 dl/g,   IV) a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn), as measured by gel permeation chromatography (GPC), of from 1.0 to 3.5,   V) a ratio of an irregularly bonded propylene monomer based on 2,1-insertion to all the propylene constituent units, as determined from a  13 C-NMR spectrum, of not more than 1.0 mol %, and a ratio of an irregularly bonded α-olefin monomer based on 2,1-insertion to all the α-olefin constituent units, as determined from a  13 C-NMR spectrum, of not more than 1.0 mol %; and   the metallocene catalyst comprises:
 a transition metal compound (1a) represented by the following formula (1a) 
   
       
         
           
           
               
               
           
         
         
           wherein R 3  is selected from the group consisting of a hydrocarbon group and silicon-containing group; R 1 , R 2  and R 4  are the same or different from one another and selected from the group consisting of hydrogen, a hydrocarbon group and silicon-containing group; R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 ,R 12 , R 13  and R 14  are the same or different from one another and selected from the group consisting of hydrogen, a hydrocarbon group and silicon-containing group; adjacent substituent groups R 5  to R 12  are optionally linked each to other to form a ring; R 13  and R 14  are the same or different each from other and are optionally linked to form a ring; 
           M is a Group 4 transition metal; 
           Y is a carbon atom; 
           Q is identical or different from each other and selected from the group consisting of halogen, a hydrocarbon group, anion ligand or neutral ligand capable of coordination with a lone pair of electrons; and 
           j is an integer of 1 to 4, 
         
         an organoaluminum oxy-compound (1b) and/or 
         a compound (2b) capable of forming an ion pair by reacting the transition metal compound (1a) and optionally 
         an organoaluminum compound (c). 
       
     
     
         2 . The polyolefin resin composition of  claim 1 , wherein the propylene polymer (PP-C) has a melting point of 140° C. or above as measured by DSC. 
     
     
         3 . The polyolefin resin composition of  claim 1 , wherein the propylene polymer (PP-C) has a melt flow rate of 0.01 to 1000g/10 min as measured at 230° C. under a load of 2.16 kg. 
     
     
         4 . The polyolefin resin composition of  claim 2 , wherein the propylene polymer (PP-C) comprises a polymer portion (A1) prepared mainly using a catalyst system of titanium tetrachloride supported on magnesium chloride, and a polymer portion (A2) prepared using a metallocene catalyst, wherein the polymer portions (A1) and (A2) have a weight ratio ((A1)/(A2)) of 1/99 to 99/1.