	US 12,031,039 B2
	Tread rubber composition and pneumatic tire
Masako Nakatani, Hyogo (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Appl. No. 17/422,862
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
PCT Filed Jan. 21, 2020, PCT No. PCT/JP2020/001964 § 371(c)(1), (2) Date Jul. 14, 2021, PCT Pub. No. WO2020/158516, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-017109 (JP), filed on Feb. 1, 2019.
Prior Publication US 2022/0098390 A1, Mar. 31, 2022
Int. Cl. C08L 9/06 (2006.01); B60C 1/00 (2006.01)

CPC C08L 9/06 (2013.01) [B60C 1/0016 (2013.01); C08L 2205/025 (2013.01); C08L 2205/03 (2013.01)]

12 Claims

1. A tread rubber composition, having a stress at 200% elongation (M200 in MPa) at 25° C., a complex modulus (E* in MPa) at 30° C., and a loss tangent (tan δ) at 30° C. which satisfy the following relationships:

M200×E*/tan δ≥400; and

E*≥9.1 MPa;

wherein the rubber composition comprises, per 100 parts by mass of one or more rubber components therein, 75 parts by mass or more of silica and 1 to 15 parts by mass of carbon black.