Ethylene copolymer composition

Abstract

Ethylene/α-olefin copolymer with olefin type elastomer, each having particular properties, including density and melt flow rate, with a density ratio of elastomer to copolymer of less than 1, provide compositions which have excellent moldability and form films having high mechanical strength.

What is claimed:  
     
         1 . An ethylene copolymer composition comprising: 
 (A3) an ethylene/α-olefm copolymer, which is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b) a compound of Group IV transition metal of the periodic table containing a ligand having cyclopentadienyl skeleton, and which has such properties that: 
 (i) the density is in the range of 0.850 to 0.980 g/cm 3 , and  
 (ii) the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.01 to 200 g/10 min, and  
   (B4) a graft modified ethylene polymer or a graft modified ethylene copolymer;    wherein a weight ratio ((A3):(B4)) between said ethylene/α-olefin copolymer (A3) and said graft modified ethylene polymer or copolymer (B4) is in the range of 99.5:0.5 to 60:40.    
     
     
         2 . An ethylene copolymer composition comprising: (I) an ethylene/α-olefin copolymer composition (Cl) comprising: 
 (A4) 20 to 90% by weight of an ethylene/α-olefin copolymer, which is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b) at least two kinds of compounds of Group IV transition metal of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that: 
 (i) the density is in the range of 0.850 to 0.980 g/cm 3 , and  
 (ii) the intrinsic viscosity (η) as measured in decalin at 135° C. is in the range of 0.4 to 8 dl/g; and  
 
 (A5) 10 to 80% by weight of an ethylene/α-olefin copolymer, which is different from the ethylene/α-olefin copolymer (A4) and is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b′) a compound of Group IV transition metal of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that: 
 (i) the density is in the range of 0.850 to 0.980 g/cm 3 , and  
 (ii) the intrinsic viscosity (η) as measured in decalin at 135° C. is in the range of 0.4 to 8 dl/g; and (II) a high-pressure radical polymerization low-density polyethylene (B1) having a melt flow rate (MFR) at 190° C. under a load of 2.16 kg of 0.01 to 100 g/10 min;  
 
 wherein a weight ratio ((C1):(B1)) between said ethylene/α-olefin copolymer composition (Cl) and said high-pressure radical polymerization low-density polyethylene (B 1) is in the range of 99:1 to 60:40.  
 
     
     
         3 . The ethylene copolymer composition as claimed in  claim 2 , wherein said at least two kinds of compounds (b) of Group IV transition metals of the periodic table containing a ligand having a cyclopentadienyl skeleton are: 
 at least one kind of a transition metal compound represented by the following formula (b-I):   ML 1   x    (b-I)    wherein M is a transition metal atom selected from Group IVB of the periodic table, L 1  is a ligand coordinating to the transition metal atom M, at least two of L 1  are groups selected from a cyclopentadienyl group, a methylcyclopentadienyl group, an ethylcyclopentadienyl group and a substituted cyclopentadienyl group having at least one substituent group selected from a hydrocarbon group of 3 to 10 carbon atoms, L 1  other than the (substituted) cyclopentadienyl group is a hydrocarbon group of 1 to 12 carbon atoms, an alkoxy group, an aryloxy group, a trialkylsilyl group, a halogen atom or a hydrogen atom, and x is a valence of the transition metal atom M, and    at least one kind of a transition metal compound represented by the following formula (b-Il):   ML 2   x    (b-II)    wherein M is a transition metal atom selected from Group IVB of the periodic table, L 2  is a ligand coordinating to the transition metal atom, at least two of L 2  are substituted cyclopentadienyl groups having 2- 5 substituent groups selected from a methyl group and an ethyl group, L 2  other than the substituted cyclopentadienyl group is a hydrocarbon group of 1 to 12 carbon atoms, an alkoxy group, an aryloxy group, a trialkylsilyl group, a halogen atom or a hydrogen atom, and x is a valence of the transition metal atom M.    
     
     
         4 . An ethylene copolymer composition comprising: (I) an ethylene/α-olefin copolymer composition (C2) comprising: 
 (A6) an ethylene/α-olefin copolymer in an amount of 20 to 90% by weight, which is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms having such properties that: 
 (i) the density is in the range of 0.850 to 0.980 g/cm 3 ,  
 (ii) the intrinsic viscosity (η) as measured in decalin at 135° C. is in the range of 0.4 to 8 dl/g,  
 (iii) the melt tension (MT (g)) at 190° C. and the melt flow rate (MFR) satisfy the relation 
   MT> 2.2 ×MFR −0.84, 
 (iv) the flow index (FI (l/sec)) defined by a shear rate which is given when a shear stress of molten copolymer at 190° C. reaches 2.4×10 6  dyne/cm 2  and the melt flow rate (MFR) satisfy the relation 
 FI<150<MFR, 
 (v) the molecular weight distribution (Mw/Mn) measured by GPC is in the range of 1.5 to 4, and  
 (vi) MT/(Mw/Mn) and FI/MFR satisfy the relation MT/(Mw/Mn)>0.03 X FI/MFR −3.0 with the proviso that when the value of 0.03 x FI/MFR −3.0 is less than 0, it is taken as 0; and  
 
 (A5) 10 to 80% by weight of an ethylene/α-olefin copolymer, which is different from the ethylene/α-olefin copolymer (A6) and is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b′) a compound of Group IV transition metal of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that: 
 (i) the density is in the range of 0.850 to 0.980 g/cm 3 , and  
 (ii) the intrinsic viscosity (η) as measured in decalin at 135° C. is in the range of 0.4 to 8 dl/g; and (II) a high-pressure radical polymerization low-density polyethylene (B1) having a melt flow rate (MFR) at 190° C. under a load of 2.16 kg of 0.01 to 100 g/10 min; wherein a weight ratio ((C2): (B 1)) between said ethylene/α-olefin copolymer composition (C2) and said high-pressure radical polymerization low-density polyethylene (B1) is in the range of 99:1 to 60:40.  
 
 
     
     
         5 . An ethylene copolymer composition comprising: (I) an ethylene/α-olefin copolymer composition (C3) comprising: 
 (A7) 20 to 90% by weight of an ethylene/α-olefin copolymer, which is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b′) a compound of Group IV transition metal of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that: 
 (i) the density is in the range of 0.850 to 0.980 g/cm 3 , and  
 (ii) the intrinsic viscosity (η) as measured in decalin at 135° C. is in the range of 0.4to 8 dl/g; and  
 
 (A5) 10 to 80% by weight of an ethylene/α-olefin copolymer, which is different from the ethylene/α-olefin copolymer (A7) and is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b) a compound of Group IV transition metal of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that: 
 (i) the density is in the range of 0.850 to 0.980 g/cm 3 , and  
 (ii) the intrinsic viscosity (η) as measured in decalin at 135° C. is in the range of 0.4 to 8 dl/g; and (II) a graft modified ethylene polymer or a graft modified ethylene copolymer (B4);  
 
 wherein a weight ratio ((C3):(B4)) between said ethylene/α-olefin copolymer composition (C3) and said graft modified ethylene polymer or said graft modified ethylene copolymer (B4) is in the range of 99.5:0.5 to 60:40.