	US 12,104,039 B2
	Hydrous silica for rubber reinforcing fillers and rubber composition containing hydrous silica
Masakazu Dojo, Yamaguchi (JP); and Yuta Imabeppu, Yamaguchi (JP)
Assigned to TOSOH SILICA CORPORATION, (JP)
Appl. No. 17/756,736
Filed by TOSOH SILICA CORPORATION, Yamaguchi (JP)
PCT Filed Feb. 3, 2021, PCT No. PCT/JP2021/003808 § 371(c)(1), (2) Date Jun. 1, 2022, PCT Pub. No. WO2021/157582, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 2020-017574 (JP), filed on Feb. 5, 2020.
Prior Publication US 2023/0002588 A1, Jan. 5, 2023
Int. Cl. C08K 3/36 (2006.01)

CPC C08K 3/36 (2013.01) [C08K 2201/003 (2013.01); C08K 2201/006 (2013.01)]

20 Claims

1. A hydrous silica for rubber reinforcing fillers having CTAB specific surface area in a range of 220 m²/g to 350 m²/g and a pore volume over a range of pore radius of 1.9 nm to 100 nm, as measured by a mercury press-in method, in a range of 1.7 cm³/g to 2.0 cm³/g, wherein a volume average particle diameter D50 in a volume particle size distribution measured by a laser diffraction method for the slurry obtained by dispersing 50 ml of a hydrous silica slurry adjusted to 4 mass % with an ultrasonic homogenizer at an output of 140 W for 10 minutes is in a range of 5.0 μm to 12.0 μm, and a cumulative value of hydrous silica particles over a range of 4.0 μm to 35.0 μm in the volume particle size distribution is 80% or more.