Rubber composition
AssigneeLG Chem, Ltd.
InventorsSuk Youn Kang, Jin Sook Ryu, Kyoung Hwan Oh, Jeong Heon Ahn
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Abstract
The present invention relates to a rubber composition having excellent tensile properties and viscoelasticity properties and including a conjugated diene-based polymer. The rubber composition may include a modified conjugated diene-based polymer which is selected considering target tensile properties and viscoelasticity properties, by predicting in advance the correlation between the modification ratio of the modified conjugated diene-based polymer and the dynamic viscoelasticity loss coefficient at 60° C. of the rubber composition through Mathematical Formula 1 and Mathematical Formula 2. Therefore, excellent compounding properties may be shown.
Claims13
A rubber composition comprising a modified conjugated diene-based polymer;
- a filler;
- and a vulcanizing agent,
- wherein the following Mathematical Formula 1 is satisfied, and
- the modified conjugated diene-based polymer is a conjugated diene-based polymer modified with a modifier having a purity of 90.0% or more:
- Y
- =
- 100
-
- A
- 0.6854
-
-
- X
- +
- 93.955
- [
- Mathematical
-
-
- Formula
-
-
- 1
- ]
- in Mathematical Formula 1, X is a modification ratio of the modified conjugated diene-based polymer,
- A is a dynamic viscoelasticity loss coefficient (tan δ) at 60° C. of a rubber composition comprising an unmodified conjugated diene-based polymer, and A has a real value of 0.140 to 0.160, and
- Y is a dynamic viscoelasticity loss coefficient (tan δ) at 60° C. of a rubber composition comprising the modified conjugated diene-based polymer,
- wherein the modifier is ethyl 1-(trimethylsilyl)piperidine-4-carboxylate, and
- wherein the modification ratio is a value calculated according to the following Mathematical Formula 2 using a chromatogram obtained by chromatography measurement,
- wherein the chromatography measurement is performed by a method comprising:
- dissolving a polymer comprising a modified polymer unit and an unmodified polymer unit in a first solvent to prepare a first solution;
- injecting the first solution into a column filled with an adsorbent;
- adsorbing the modified polymer unit onto the adsorbent and eluting the first solution in which the unmodified polymer unit is dissolved;
- transporting the eluted first solution to a detector;
- injecting a second solvent into the column to elute a second solution in which the adsorbed modified polymer unit is dissolved;
- and
- transporting the eluted second solution to the detector:
- modification
-
-
- ratio
-
-
- (
- %
- )
- =
-
- peak
-
-
- area
-
-
- of
-
-
- an
- modified
-
-
- polymer
-
- peak
-
-
- area
-
-
- of
-
-
- an
- un
-
- modified
-
-
- polymer
- +
- peak
-
-
- area
-
-
- of
-
-
- a
- modified
-
-
- polymer
- ×
- 100
- [
- Mathematical
-
-
- Formula
-
-
- 2
- ]
- in Mathematical Formula 2,
- the peak area of an unmodified polymer is the peak area of a chromatogram with respect to the first solution transported to the detector, and
- the peak area of a modified polymer is the peak area of a chromatogram with respect to the second solution transported to the detector.
A method for preparing a rubber composition, the method comprising:
- polymerizing a conjugated diene-based monomer in the presence of a catalyst composition in a hydrocarbon solvent to prepare an active polymer;
- modifying one terminal of the active polymer with a modifier having a purity of 90.0% or more to prepare a modified conjugated diene-based polymer;
- and
- mixing the modified conjugated diene-based polymer;
- a filler;
- and a vulcanizing agent,
- wherein the modifier is ethyl 1-(trimethylsilyl)piperidine-4-carboxylate.
Dependencies are inferred from the claim text.