US 7,507,389 B2
	Hydrophobic fumed silica
Yoshio Mitani, Yamaguchi (Japan); Katsumi Nagase, Yamaguchi (Japan); and Atsushi Takamuku, Yamaguchi (Japan)
Assigned to Tokuyama Corporation, Shunan-shi (Japan)
Appl. No. 10/555,440 PCT Filed Apr. 30, 2004, PCT No. PCT/JP2004/006308 § 371(c)(1), (2), (4) Date Nov. 03, 2005, PCT Pub. No. WO2004/099075, PCT Pub. Date Nov. 18, 2004.
Claims priority of application No. 2003-127846 (JP), filed on May 06, 2003.
Prior Publication US 2006/0269465 A1, Nov. 30, 2006
Int. Cl. C01B 33/12 (2006.01)

U.S. Cl. 423—335  [423/336; 423/337]

2 Claims

1. A hydrophobic fumed silica treated with a cyclic dimethylsiloxane, the hydrophobic fumed silica having an M-value representing an oleophilic degree in a range of 48 to 65, a tapping bulk density of larger than 80 g/L but not larger than 130 g/L, and an n-value representing the dispersion of 3.0 to 3.5 as measured in toluene; and wherein a content of aggregated particles of not smaller than 45 μm is not larger than 200 ppm in weight ratio.