US 12,168,710 B2
Rubber composition and molded article manufactured therefrom
Youk Reol Na, Daejeon (KR); Jin Young Kim, Daejeon (KR); Jae Sun Choi, Daejeon (KR); and No Ma Kim, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/287,790
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Sep. 3, 2020, PCT No. PCT/KR2020/011876
§ 371(c)(1), (2) Date Apr. 22, 2021,
PCT Pub. No. WO2021/045537, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 10-2019-0108952 (KR), filed on Sep. 3, 2019.
Prior Publication US 2021/0395408 A1, Dec. 23, 2021
Int. Cl. C08F 36/06 (2006.01); C08C 19/25 (2006.01); C08F 2/06 (2006.01); C08F 4/48 (2006.01); C08L 9/00 (2006.01); B60C 1/00 (2006.01)
CPC C08F 36/06 (2013.01) [C08C 19/25 (2013.01); C08F 2/06 (2013.01); C08F 4/48 (2013.01); C08L 9/00 (2013.01); B60C 1/0016 (2013.01)] 10 Claims
 
1. A rubber composition comprising:
a first synthetic rubber; and
a second synthetic rubber,
wherein the first synthetic rubber is a solution-polymerized modified conjugated diene-based rubber which has a 1,2-vinyl bond content of 60 wt % to 90 wt %, and of which at least one terminal is bonded to a functional group;
the second synthetic rubber is a conjugated diene-based rubber which has a 1,2-vinyl bond content of less than 40 wt %,
an interaction parameter (χblend) defined by the following Mathematical Formula 1 at room temperature is 2.0×10−3 or more and 10.0×10−3 or less, wherein the interaction parameter is an interaction measurement determined according to 1,2-vinyl bond and styrene bond microstructure in the rubber composition,
wherein the second synthetic rubber is a lithium catalyzed conjugated diene based rubber;
wherein the second synthetic rubber is a modified conjugated diene-based rubber in which a functional group is bonded to at least one terminal; and
the interaction parameter (Xblend) is defined by:
Xblend=KφSXVS+(φS−KSXBS−KS−K)XVB  [Mathematical Formula 1]
in Mathematical Formula 1,
K is Y−X(1−φS), φs is a volume ratio of a styrene bond in the first synthetic rubber, X is a volume ratio of a 1,2-vinyl bond in the first synthetic rubber, Y is a volume ratio of a 1,2-vinyl bond in the second synthetic rubber, XVS is 0.05650+5.65T−1, XBS is 0.00843+10.2T−1, and XVB is 0.00269+1.87T−1.