Modifier, modified and conjugated diene-based polymer and rubber composition including the same
The present invention provides a modifier, a modified conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified conjugated diene-based polymer, and more particularly, a modifier which includes a compound represented by Formula 1 and is capable of improving the mixing properties between a conjugated diene-based polymer and a filler, a modified conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified conjugated diene-based polymer.
1. A modifier comprising a compound selected from the group consisting of the compounds represented by the following Formulae 2-1 to 2-5:
2. A modified conjugated diene-based polymer, comprising a functional group derived from the modifier according to claim 1 .
3. The modified conjugated diene-based polymer of claim 2 , wherein the modified conjugated diene-based polymer has a Mooney viscosity (MV) of 20 to 70 at 100° C.
4. The modified conjugated diene-based polymer of claim 2 , which has molecular weight distribution 2.5 to 3.5.
5. A method for preparing a modified conjugated diene-based polymer, the method comprising:
a modification step of reacting a conjugated diene-based polymer comprising an organometal part activated from a catalyst composition comprising a lanthanide series rare earth element-containing compound with the modifier according to claim 4 .
6. The method for preparing a modified conjugated diene-based polymer of claim 5 , further comprising prior to the modification step, a step of performing polymerization reaction of a conjugated diene-based monomer using a catalyst composition comprising a lanthanide series rare earth element-containing compound in a polymerization solvent to prepare a conjugated diene-based polymer having an activated organometal part.
7. The method for preparing a modified conjugated diene-based polymer of claim 6 , wherein the catalyst composition comprises the lanthanide series rare earth element-containing compound, an alkylating agent and a halogen compound.
8. The method for preparing a modified conjugated diene-based polymer of claim 6 , wherein the lanthanide series rare earth element-containing compound comprises a neodymium compound represented by the following Formula 3:
in Formula 3,
R a to R c are each independently hydrogen, or an alkyl group of 1 to 12 carbon atoms,
provided that not all R a to R c are hydrogen, at the same time.
9. The method for preparing a modified conjugated diene-based polymer of claim 6 , wherein the catalyst composition further comprises a conjugated diene-based monomer.
10. The method for preparing a modified conjugated diene-based polymer of claim 5 , wherein the conjugated diene-based polymer comprising the activated organometal part is a conjugated diene-based polymer comprising a terminal activated organometal part.
11. The method for preparing a modified conjugated diene-based polymer of claim 5 , wherein the conjugated diene-based polymer comprising the activated organometal part is a neodymium catalyzed butadiene-based polymer comprising a repeating unit derived from an 1,3-butadiene monomer.
12. The method for preparing a modified conjugated diene-based polymer of claim 5 , wherein the modified conjugated diene-based polymer has molecular weight distribution 2.5 to 3.5.