Ethylene/alpha-olefin copolymer having excellent processability

1. An ethylene/1-butene copolymer having:

a weight average molecular weight of 50,000 to 150,000 g/mol,

a molecular weight distribution (M w /M n ) of 5 to 10,

a density of 0.940 to 0.965 g/cm 3 ,

a melt flow rate ratio (MFR 5 /MFR 2-16 , measured at 190° C. according to ASTM 1238) of 3.5 or more,

a C 2 value of −0.25 or less when a graph of a complex viscosity (η*[Pa·s]) versus a frequency (ω [rad/s]) is fitted to a Power Law of Equation 1 below,

y=c 1 x c 2 ,  [Equation 1]

wherein x is the frequency, y is the complex viscosity, C 1 is a consistency index, and C 2 is a CV index.

2. The ethylene/1-butene copolymer according to claim 1 , wherein the weight average molecular weight is 80,000 to 90,000 g/mol.

3. The ethylene/1-butene copolymer according to claim 1 , wherein the molecular weight distribution is 5 to 6.

4. The ethylene/1-butene copolymer according to claim 1 , wherein the density is 0.960 to 0.965 g/cm 3 .

5. The ethylene/1-butene copolymer according to claim 1 , wherein the melt flow rate ratio is 3.5 to 40.

6. The ethylene/1-butene copolymer according to claim 1 , wherein the C 2 value is −0.40 to −0.25.

7. The ethylene/1-butene copolymer according to claim 1 , wherein

the ethylene/1-butene copolymer is produced by polymerizing ethylene and 1-butene in the presence of one or more of the first metallocene compounds represented by the following Chemical Formula 1; and one or more of the second metallocene compounds selected from the compounds represented by the following Chemical Formulas 3 to 5:

in Chemical Formula 1,

A is hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-20 aryl, C 7-20 alkylaryl, C 7-20 arylalkyl, C 1-20 alkoxy, C 2-20 alkoxyalkyl, C 3-20 heterocycloalkyl, or C 5-20 heteroaryl;

D is —O—, —S—, —N(R)— or —Si(R)(R′)—, wherein R and R′ are same as or different from each other, and are each independently hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, or C 6-20 aryl;

L is a linear or branched C 1-10 alkylene;

B is carbon, silicon or germanium;

Q is hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-20 aryl, C 7-20 alkylaryl, or C 7-20 arylalkyl;

M is a Group 4 transition metal;

X 1 and X 2 are same as or different from each other and are each independently halogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-20 aryl, nitro, amido, C 1-20 alkylsilyl, C 1-20 alkoxy, or C 1-20 sulfonate;

C 1 and C 2 are same as or different from each other and are each independently represented by one of the following Chemical Formulas 2a, 2b or 2c, provided that cases where both C 1 and C 2 are Chemical Formula 2c, are excluded;

in Chemical Formulas 2a, 2b and 2c,

R 1 to R 17 and R 1 ′ to R 9 ′ are same as or different from each other, and are each independently hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 1-20 alkylsilyl, C 1-20 silylalkyl, C 1-20 alkoxysilyl, C 1-20 alkoxy, C 6-20 aryl, C 7-20 alkylaryl, or C 7-20 arylalkyl, and adjacent two or more of the R 10 to R 17 are connected to each other to form a substituted or unsubstituted aliphatic or aromatic ring;

(Cp 1 R a ) n (Cp 2 R b )M 1 Z 1 3-n   [Chemical Formula 3]

in Chemical Formula 3,

M 1 is a Group 4 transition metal;

Cp 1 and Cp 2 are same as or different from each other and are each independently any one selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl, and fluorenyl radicals, which may be substituted with a hydrocarbon having 1 to 20 carbon atoms;

R a and R b are same as or different from each other and are each independently hydrogen, C 1-20 alkyl, C 1-10 alkoxy, C 2-20 alkoxyalkyl, C 6-20 aryl, C 6-10 aryloxy, C 2-20 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 8-40 arylalkenyl, or C 2-10 alkynyl;

Z 1 is a halogen atom, C 1-20 alkyl, C 2-10 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 6-20 aryl, substituted or unsubstituted C 1-20 alkylidene, substituted or unsubstituted amino, C 2-20 alkylalkoxy, or C 7- 40 arylalkoxy;

n is 1 or 0;

(Cp 3 R c ) m B 1 (Cp 4 R d )M 2 Z 2 3-m   [Chemical Formula 4]

in Chemical Formula 4,

M 2 is a Group 4 transition metal;

Cp 3 and Cp 4 are same as or different from each other and are each independently any one selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl and fluorenyl radicals, which may be substituted with a hydrocarbon having 1 to 20 carbon atoms;

R c and R d are same as or different from each other and are each independently hydrogen, C 1-20 alkyl, C 1-10 alkoxy, C 2-20 alkoxyalkyl, C 6-20 aryl, C 6-10 aryloxy, C 2-20 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 8-40 arylalkenyl, or C 2-10 alkynyl;

Z 2 is a halogen atom, C 1-20 alkyl, C 2-10 alkenyl, C 7-40 alkyl aryl, C 7-40 arylalkyl, C 6-20 aryl, substituted or unsubstituted C 1-20 alkylidene, substituted or unsubstituted amino, C 2-20 alkylalkoxy, or C 7-40 arylalkoxy;

B 1 is at least one of carbon, germanium, silicon, phosphorus, or nitrogen atom containing radicals, which cross-link Cp 3 R c ring and Cp 4 R d ring or which cross-link one Cp 4 R d ring to M 2 , a combination thereof;

M is 1 or 0;

(Cp 5 R e )B 2 (J)M 3 Z 3 2   [Chemical Formula 5]

in Chemical Formula 5,

M 3 is a Group 4 transition metal;

Cp 5 is any one selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl and fluorenyl radicals, which may be substituted with a hydrocarbon having 1 to 20 carbon atoms;

R c is hydrogen, C 1-20 alkyl, C 1-10 alkoxy, C 2-20 alkoxyalkyl, C 6-20 aryl, C 6-10 aryloxy, C 2-20 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 8-40 arylalkenyl, or C 2-10 alkynyl;

Z 3 is a halogen atom, C 1-20 alkyl, C 2-10 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 6-20 aryl, substituted or unsubstituted C 1-20 alkylidene, substituted or unsubstituted amino, C 2-20 alkylalkoxy, or C 7-40 arylalkoxy;

B 2 is at least one of carbon, germanium, silicon, phosphorus, or nitrogen atom containing radicals, which cross-link Cp 5 R e ring and J, or a combination thereof;

J is any one selected from the group consisting of NR f , O, PR f and S, and the R f is C 1-20 alkyl, aryl, substituted alkyl or substituted aryl.