US 11,655,315 B2
Method for preparing catalyst for polymerizing conjugated diene, catalyst and method for preparing conjugated diene-based polymer using the same
Kyoung Hwan Oh, Daejeon (KR); Hee Jung Jeon, Daejeon (KR); Su Hwa Kim, Daejeon (KR); Jeong Heon Ahn, Daejeon (KR); Jin Sook Ryu, Daejeon (KR); and Suk Youn Kang, Daejeon (KR)
Assigned to LG Chem, Ltd.
Appl. No. 16/650,681
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Oct. 30, 2018, PCT No. PCT/KR2018/012960
§ 371(c)(1), (2) Date Mar. 25, 2020,
PCT Pub. No. WO2019/088634, PCT Pub. Date May 9, 2019.
Claims priority of application No. 10-2017-0142547 (KR), filed on Oct. 30, 2017.
Prior Publication US 2021/0040241 A1, Feb. 11, 2021
Int. Cl. C08F 4/54 (2006.01); C08F 8/00 (2006.01); C08F 136/06 (2006.01)
CPC C08F 4/545 (2013.01) [C08F 8/00 (2013.01); C08F 136/06 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for preparing a conjugated diene-based polymer, the method consisting of:
mixing a lanthanide rare earth element-containing compound, an alkylating agent compound and a halogen compound in the presence of a non-polar hydrocarbon-based solvent to prepare a catalyst composition;
adding a first conjugated diene-based monomer to the catalyst composition to form a preformed catalyst composition; and
aging the preformed catalyst composition at a temperature of −8° C. to −12° C. for 17 hours to 20 hours to prepare the catalyst,
polymerizing a second conjugated diene-based monomer in the presence of the catalyst, and
adding a modifier and performing a modification reaction.