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−K)φSXBS−K(φS−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.
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