| CPC C08F 279/04 (2013.01) [C08F 2/26 (2013.01); C08F 36/06 (2013.01); C08K 5/098 (2013.01)] | 13 Claims |
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1. A method for preparing a conjugated diene-based polymer, the method comprising:
batch-adding conjugated diene-based monomers to a reactor before an initiation of polymerization; and
preparing a conjugated diene-based polymer by initiating and carrying out polymerization while continuously adding conjugated diene-based monomers to the reactor,
wherein an emulsifier is dividedly added before the initiation of the polymerization and when a polymerization conversion rate of 31% to 80% is reached, and
wherein a weight ratio of the batch-added conjugated diene-based monomers and the continuously added conjugated diene-based monomer is 1:99 to 35:65,
wherein the emulsifier includes a salt of a compound represented by Chemical Formula 1:
 wherein, in Chemical Formula 1,
X is a C1-C20 tetravalent or higher aliphatic hydrocarbon with or without an unsaturated bond
R1 to R4, which are the same or different from each other, are each independently hydrogen, a C1-C20 monovalent aliphatic hydrocarbon, or *-L3-COOH,
L1 to L3, which are the same or different from each other, are each independently a direct bond or a C1-C20 divalent aliphatic hydrocarbon, and
l and m, which are the same or different from each other, are each independently 0 to 6.
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