US 12,404,359 B2
Rubber polymer, method for preparing thereof, and rubber composition comprising the same
Han Baek Lee, Daejeon (KR); Hoo-Chae Kim, Daejeon (KR); Seung-Hwon Lee, Daejeon (KR); Seung Hyun Do, Daejeon (KR); and Daejune Joe, Daejeon (KR)
Assigned to Korea Kumho Petrochemical Co., Ltd., Seoul (KR)
Filed by Korea Kumho Petrochemical Co., Ltd., Seoul (KR)
Filed on Oct. 22, 2021, as Appl. No. 17/508,148.
Claims priority of application No. 10-2020-0137818 (KR), filed on Oct. 22, 2020; and application No. 10-2021-0139655 (KR), filed on Oct. 19, 2021.
Prior Publication US 2022/0127403 A1, Apr. 28, 2022
Int. Cl. C08F 279/02 (2006.01); C08C 19/20 (2006.01); C08C 19/25 (2006.01); C08C 19/26 (2006.01); C08F 136/06 (2006.01); C08L 7/00 (2006.01); C08L 9/06 (2006.01); C08L 51/04 (2006.01)
CPC C08F 279/02 (2013.01) [C08C 19/20 (2013.01); C08C 19/25 (2013.01); C08C 19/26 (2013.01); C08F 136/06 (2013.01); C08L 7/00 (2013.01); C08L 9/06 (2013.01); C08L 51/04 (2013.01)] 9 Claims
 
1. A rubber polymer comprising a unit structure derived from a conjugated diene-based monomer and at least one of compounds represented by the following Chemical Formula 4:

OG Complex Work Unit Chemistry
in Chemical Formulas,
B is oxygen or sulfur,
C is silicon or tin,
Z is a functional group represented by the following Chemical Formula Z,

OG Complex Work Unit Chemistry
each R2 is independently a C1 to C20 linear or branched substituted or unsubstituted alkyl group, a C3 to C20 substituted or unsubstituted cycloalkyl group, or a C6 to C20 substituted or unsubstituted aryl group,
wherein:
the rubber polymer is prepared by using a polymerization system including a neodymium-based catalyst,
the rubber polymer has a degree of branching of 2.0 to 2.5,
the rubber polymer has a molecular weight distribution (Mw/Mn) of 1.5 to 2.5, and
the degree of branching is calculated by the ratio of the Mooney viscosity (MV) and solution viscosity (SV) at 25° C., multiplied by 10(MV/SV*10).