Modifying agent and modified conjugated diene polymer prepared by using the same
A modifying agent, a modified conjugated diene polymer prepared using the same, a method for preparing a modified conjugated diene polymer, and a rubber composition including a modified conjugated diene polymer are disclosed herein. In some embodiments, a modifying agent comprises a compound represented by formula 1. The modifying agent is capable of improving processability of a rubber composition including the polymer prepared using the modifying agent. Fuel consumption properties of a car using tires including the rubber composition may be improved.
1. A modifying agent comprising a compound represented by the following Formula 1:
in Formula 1,
R 1 to R 8 are each independently an alkyl group of 1 to 20 carbon atoms,
L 1 and L 2 are each independently an alkylene group of 1 to 20 carbon atoms, and
n is an integer of 2 to 4.
2. The modifying agent according to claim 1 , wherein R 1 to R 8 are each independently an alkyl group of 1 to 10 carbon atoms.
3. The modifying agent according to claim 2 , wherein R 1 to R 8 are each independently an alkyl group of 1 to 6 carbon atoms.
4. The modifying agent according to claim 1 , wherein R 1 to R 4 are each independently a methyl group or an ethyl group, and R 5 to R 8 are each independently an alkyl group of 1 to 10 carbon atoms.
5. The modifying agent according to claim 1 , wherein the compound represented by Formula 1 is any one selected from the group consisting of the following Formula 1a to Formula 1e:
6. A modified conjugated diene polymer comprising a functional group derived from a compound represented by the following Formula 1:
in Formula 1,
R 1 to R 8 are each independently an alkyl group of 1 to 20 carbon atoms,
L 1 and L 2 are each independently an alkylene group of 1 to 20 carbon atoms, and
n is an integer of 2 to 4.
7. The modified conjugated diene polymer according to claim 6 , wherein the modified conjugated diene polymer is a homopolymer of a conjugated diene monomer or a copolymer of a conjugated diene monomer and an aromatic vinyl monomer.
8. The modified conjugated diene polymer according to claim 6 , wherein the modified conjugated diene polymer has a number average molecular weight of 50,000 g/mol to 2,000,000 g/mol, a weight average molecular weight of 100,000 g/mol to 4,000,000 g/mol, and molecular weight distribution of 1.1 to 3.0.
9. The modified conjugated diene polymer according to claim 6 , wherein the modified conjugated diene polymer has a mooney viscosity at 100° C. of 40 to 140.
10. A method for preparing a modified conjugated diene polymer, the method comprising:
polymerizing a conjugated diene monomer, or an aromatic vinyl monomer and a conjugated diene monomer, in the presence of an organic alkali metal compound in a hydrocarbon solvent to prepare an active polymer of which at least one terminal is coupled with an alkali metal; and
reacting the active polymer with a modifying agent comprising a compound represented by the following Formula 1:
in Formula 1,
R 1 to R 8 are each independently an alkyl group of 1 to 20 carbon atoms,
L 1 and L 2 are each independently an alkylene group of 1 to 20 carbon atoms, and
n is an integer of 2 to 4.