Olefin-based polymer

1. An olefin-based polymer, which has (1) a density (d) ranging from 0.85 to 0.90 g/cc, measured according to ASTM D-792, (2) a melt index (MI) ranging from 0.1 g/10 min to 15 g/10 min, measured at 190° C., 2.16 kg load conditions, (3) the density (d) and the melt temperature (Tm) satisfying the following Equation 1, and (4) a ratio (hardness/Tm) of the hardness (shore A) to the melt temperature (Tm) in a range of 1.0 to 1.3,

Tm (° C.)= a×d−b   [Equation 1]

In Equation 1, 2,350<a<2,500, and 1,900<b<2,100,

wherein the olefin-based polymer has a hardness (shore A) in the range of 30 to 90.

2. The olefin-based polymer according to claim 1 , wherein the olefin-based polymer has (5) a weight average molecular weight (Mw) in a range of 10,000 g/mol to 500,000 g/mol.

3. The olefin-based polymer according to claim 1 , wherein the olefin-based polymer satisfies (6) a molecular weight distribution (MWD) in the range of 1.0 to 3.0.

4. The olefin-based polymer according to claim 1 , wherein the olefin-based polymer is a copolymer of ethylene and an alpha-olefin comonomer having 3 to 12 carbon atoms.

5. The olefin-based polymer according to claim 4 , wherein the alpha-olefin comonomer includes any one or a mixture of two or more selected from the group consisting 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 norbornene, phenyl norbornene, vinyl norbornene, dicyclopentadiene, 1,4-butadiene, 1,5-pentadiene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene and 3-chloromethyl styrene.

6. The olefin-based polymer according to claim 1 , wherein the olefin-based polymer has (6) a molecular weight distribution (MWD) in a range of 0.4 to 3.0, and (7) I 10 /I 2 >7.91(MI 2.16 ) −0.188 .

7. The olefin-based polymer according to claim 1 , wherein the olefin-based polymer is obtained by a preparation method including a step of polymerizing an olefin-based monomer in the presence of a catalyst composition for olefin polymerization including a transition metal compound represented by the following Formula 1:

in Formula 1,

R 1 is hydrogen; an alkyl having 1 to 20 carbon atoms; a cycloalkyl having 3 to 20 carbon atoms; an alkenyl having 2 to 20 carbon atoms; an alkoxy having 1 to 20 carbon atoms; an aryl having 6 to 20 carbon atoms; an arylalkoxy having 7 to 20 carbon atoms; an alkylaryl having 7 to 20 carbon atoms; or an arylalkyl having 7 to 20 carbon atoms,

R 2a to R 2e each independently represent hydrogen; a halogen; an alkyl having 1 to 20 carbon atoms; a cycloalkyl having 3 to 20 carbon atoms; an alkenyl having 2 to 20 carbon atoms; an alkoxy having 1 to 20 carbon atoms; or an aryl having 6 to 20 carbon atoms,

R 3 is hydrogen; a halogen; an alkyl having 1 to 20 carbon atoms; a cycloalkyl having 3 to 20 carbon atoms; an alkenyl having 2 to 20 carbon atoms; an aryl having 6 to 20 carbon atoms; an alkylaryl having 6 to 20 carbon atoms; an arylalkyl having 7 to 20 carbon atoms; an alkylamido having 1 to 20 carbon atoms; an arylamido having 6 to 20 carbon atoms; an alkylidene having 1 to 20 carbon atoms; or phenyl substituted with one or more selected from the group consisting of a halogen, an alkyl having 1 to 20 carbon atoms, a cycloalkyl having 3 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an alkoxy having 1 to 20 carbon atoms, and an aryl having 6 to 20 carbon atoms,

R 4 to R 9 each independently represent hydrogen; a silyl; an alkyl having 1 to 20 carbon atoms; a cycloalkyl having 3 to 20 carbon atoms; an alkenyl having 2 to 20 carbon atoms; an aryl having 6 to 20 carbon atoms; an alkylaryl having 7 to 20 carbon atoms; an arylalkyl having 7 to 20 carbon atoms; or a metalloid radical of a Group 14 metal substituted with a hydrocarbyl having 1 to 20 carbon atoms; and two or more adjacent ones of R 6 to R 9 are capable of being connected to each other to form a ring,

Q is Si, C, N, P or S,

M is a Group 4 transition metal, and

X 1 and X 2 are each independently hydrogen; a halogen; an alkyl having 1 to 20 carbon atoms; a cycloalkyl having 3 to 20 carbon atoms; an alkenyl having 2 to 20 carbon atoms; an aryl having 6 to 20 carbon atoms; an alkylaryl having 7 to 20 carbon atoms; an arylalkyl having 7 to 20 carbon atoms; an alkylamino having 1 to 20 carbon atoms; an arylamino having 6 to 20 carbon atoms; or an alkylidene having 1 to 20 carbon atoms.

8. The olefin-based polymer according to claim 1 , wherein the melt temperature (Tm) is 10° C. to 80° C.

9. The olefin-based polymer according to claim 4 , wherein the alpha-olefin comonomer is comprised in an amount of from 5 wt % to 40 wt %, with respect to a total weight of the copolymer.

10. The olefin-based polymer according to claim 7 , wherein the compound of Formula 1 comprises a compound represented by any one among the structures below:

11. The olefin-based polymer according to claim 7 , wherein the catalyst composition further includes one or more cocatalyst compounds represented by the following Formula 8, Formula 9 or Formula 10,

—[Al(R 11 )—O] a —,  [Formula 8]

A(R 11 ) 3 ,  [Formula 9]

[L-H] + [W(D) 4 ] − or [L] + [W(D) 4 ] − ,  [Formula 10]

in Formulas 8 to 10,

R 11 is the same or different, and each independently selected from the group consisting of a halogen, a hydrocarbyl having 1 to 20 carbon atoms, and a hydrocarbyl having 1 to 20 carbon atoms substituted with a halogen,

A is aluminum or boron,

D is independently an aryl having 6 to 20 carbon atoms or an alkyl having 1 to 20 carbon atoms in which at least one hydrogen atom is substituted with a substituent, and here, the substituent is at least any one selected from the group consisting of a halogen, a hydrocarbyl having 1 to 20 carbon atoms, an alkoxy having 1 to 20 carbon atoms, and an aryloxy having 6 to 20 carbon atoms,

H is a hydrogen atom,

L is a neutral or cationic Lewis acid,

W is a Group 13 element, and

a is an integer of 2 or more.

12. The olefin-based polymer according to claim 7 , wherein the polymerization of the olefin-based monomer is carried out at a temperature of about 25° C. to about 500° C., and a pressure of about 1 Kgf/cm 2 to about 100 Kgf/cm 2 .