Polyolefin

1. A polyolefin having

a density of 0.910 g/cm 3 to 0.930 g/cm 3 ;

SCB (Short Chain Branch) per 1000 carbons of 1.0 to 5.0; and

a block comonomer distribution index (BCDI) calculated by Formula 1 of 1.0 or less:

B

⁢

C

⁢

D

⁢

I

=

A

⁢

S

⁢

L

⁢

fi

⁡

(

<

8

⁢

nm

)

+

A

⁢

S

⁢

L

⁢

fi

⁡

(

>

30

⁢

nm

)

A

⁢

S

⁢

L

⁢

fi

⁡

(

8

∼

30

⁢

nm

)

[

Formula

⁢

1

]

in Formula 1,

ASL fi (<8 nm) is fraction (%) of chains having ASL (Average Ethylene Sequence Length) less than 8 nm, by SSA (Successive Self-nucleation and Annealing) analysis,

ASL fi (>30 nm) is fraction (%) of chains having ASL greater than 30 nm, by the SSA analysis, and

ASL fi (8˜30 nm) is fraction (%) of chains having ASL of 8 to 30 nm, by the SSA analysis,

wherein the SSA analysis is conducted using differential scanning calorimeter, by heating the polyolefin to a first heating temperature of 120 to 124° C., maintaining for 15 to 30 minutes, and then, cooling to 28 to 32° C., and while decreasing heating temperature by stages with (n+1)th heating temperature being 3 to 7° C. lower than nth heating temperature, and repeating heating-annealing-quenching until a final heating temperature becomes 50 to 54° C.,

wherein the polyolefin is a copolymer comprising a unit derived from ethylene, and

wherein the polyolefin has a melting point (Tm) of 120 to 124° C.

2. The polyolefin according to claim 1 , wherein the polyolefin has weight average molecular weight (Mw) of 100,000 to 500,000 g/mol.

3. The polyolefin according to claim 1 , wherein the ASL fi (8˜30 nm) is 51% to 75%.

4. The polyolefin according to claim 1 , wherein the polyolefin is a copolymer of the ethylene and an alpha olefin.

5. The polyolefin according to claim 1 , wherein the alpha olefin comprises one or more of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicosene, norbornene, norbornadiene, ethylidene norbordene, phenyl norbordene, vinyl norbordene, dicyclopentadiene, 1,4-butadiene, 1,5-pentadiene, 1,6-hexadiene, styrene, alpha-methyl styrene, divinylbenzene, or 3-chloromethyl styrene.

6. The polyolefin according to claim 4 , wherein the polyolefin is prepared by polymerizing the ethylene and alpha olefin, in the presence of a supported metallocene catalyst comprising a metallocene compound represented by Chemical Formula 1; and a carrier supporting the metallocene compound:

in Chemical Formula 1,

M 1 is a Group 4 transition metal;

A 1 is carbon (C), silicon (Si), or germanium (Ge);

Q 1 and Q 2 are identical to or different from each other, and each independently, hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkoxyalkyl, C 7-40 aryloxyalkyl, C 6-40 aryl, C 7-40 alkylaryl, or C 7-40 arylalkyl;

X 1 and X 2 are identical to or different from each other, and each independently, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-40 aryl, a nitro group, an amido group, C 1-20 alkylsilyl, C 1-20 alkoxy, or C 1-20 sulfonate group;

C 1 and C 2 are identical to or different from each other, and each independently, represented by one of Chemical Formula 2a, 2b, or 2c,

in Chemical Formulas 2a, 2b, and 2c, R 1 to R 22 are identical to or different from each other, and each independently, hydrogen, halogen, C 1-20 alkyl, C 1-20 haloalkyl, C 2-20 alkenyl, C 1-20 alkylsilyl, C 1-20 silylalkyl, C 1-20 alkoxysilyl, C 1-20 alkoxy, C 6-40 aryl, C 7-40 alkylaryl, or C 7-40 arylalkyl, and two or more neighboring groups of R 15 to R 22 are optionally connected with each other to form a substituted or unsubstituted aliphatic or aromatic ring;

* represents a site binding to A 1 , and

· represents a site binding to M 1 .

7. The polyolefin according to claim 6 , wherein the metallocene compound is represented by any one of the following structural formulas:

8. The polyolefin according to claim 1 , wherein the ASL fi (<8 nm) is 14% to 23%.

9. The polyolefin according to claim 1 , wherein the ASL fi (>30 nm) is 14% to 28%.