Modified conjugated diene-based polymer and rubber composition comprising same
A modified conjugated diene-based polymer having high linearity and improved compounding properties is provided. The modified conjugated diene-based polymer includes phosphor, sulfur and chlorine in specific amount ranges, and the degree of branching is controlled, and accordingly, if applied to a rubber composition, tensile strength and viscoelasticity may be excellent, and processability may be markedly improved.
1. A modified conjugated diene-based polymer, comprising:
240 to 470 ppm of phosphor (P) based on a weight of the modified conjugated diene-based polymer;
490 to 900 ppm of sulfur (S) based on a weight of the modified conjugated diene-based polymer; and
450 to 1100 ppm of chlorine (Cl) based on a weight of the modified conjugated diene-based polymer.
2. The modified conjugated diene-based polymer according to claim 1 , comprising:
250 to 400 ppm of phosphor (P) based on the weight of the modified conjugated diene-based polymer;
550 to 850 ppm of sulfur (S) based on the weight of the modified conjugated diene-based polymer; and
650 to 1000 ppm of chlorine (Cl) based on the weight of the modified conjugated diene-based polymer.
3. The modified conjugated diene-based polymer according to claim 1 , wherein the phosphor is derived from a compound represented by the following Formula 1:
wherein,
Rx is an aliphatic hydrocarbonyl group of 1 to 30 carbon atoms, an alkylaryl group of 7 to 30 carbon atoms or an arylalkyl group of 7 to 30 carbon atoms,
Ry is a hydroxyl group (—OH), an aliphatic hydrocarbonyl group of 1 to 30 carbon atoms, an alkylaryl group of 7 to 30 carbon atoms or an arylalkyl group of 7 to 30 carbon atoms, and
n is an integer of 1 to 20.
4. The modified conjugated diene-based polymer according to claim 3 , wherein the phosphor is derived from two or more compounds represented by Formula 1.
5. The modified conjugated diene-based polymer according to claim 1 , wherein the modified conjugated diene-based polymer is a neodymium catalyzed modified conjugated diene-based polymer.
6. The modified conjugated diene-based polymer according to claim 1 , wherein the chlorine and the sulfur are derived from sulfur chloride.
7. The modified conjugated diene-based polymer according to claim 1 , wherein the modified conjugated diene-based polymer has a Mooney viscosity, measured by using a rotor at 100° C. at a rotor speed of 2±0.02 rpm, of 20 to 120.
8. The modified conjugated diene-based polymer according to claim 1 , wherein the modified conjugated diene-based polymer has a Mooney viscosity increasing ratio (%) of a polymer after modification to a Mooney viscosity of a polymer before modification of 50 to 200%, wherein the Mooney viscosity increasing ratio is computed by the following Mathematical Formula 1:
Mooney
viscosity
increasing
ratio
(
%
)
=
(
mooney
viscosity
at
100
°
C
.
of
polymer
after
modification
-
mooney
viscosity
at
100
°
C
.
of
polymer
before
modification
)
(
mooney
viscosity
at
100
°
C
.
of
polymer
before
modification
)
×
100
[
Mathematical
Formula
1
]
9. A rubber composition comprising the modified conjugated diene-based polymer of claim 1 .