US 9,809,682 B2
Hydrophobized spherical polyalkylsilsesquioxane fine particle, external additive for toner, dry toner for electrophotography, and method of manufacturing hydrophobized spherical polyalkylsilsesquioxane fine particle
Kenichi Ishizu, Shunan (JP); Yohei Chikashige, Shunan (JP); and Tadaharu Komatsubara, Shunan (JP)
Assigned to TOKUYAMA CORPORATION, Yamaguchi (JP)
Appl. No. 15/109,275
Filed by TOKUYAMA CORPORATION, Shunan-shi, Yamaguchi (JP)
PCT Filed Jan. 7, 2015, PCT No. PCT/JP2015/050297
§ 371(c)(1), (2) Date Jun. 30, 2016,
PCT Pub. No. WO2015/107961, PCT Pub. Date Jul. 23, 2015.
Claims priority of application No. 2014-004411 (JP), filed on Jan. 14, 2014.
Prior Publication US 2016/0319077 A1, Nov. 3, 2016
Int. Cl. C08G 77/04 (2006.01); G03G 9/097 (2006.01)
CPC C08G 77/045 (2013.01) [G03G 9/09708 (2013.01); G03G 9/09725 (2013.01); G03G 9/09775 (2013.01)] 17 Claims
 
1. A hydrophobized spherical polyalkylsilsesquioxane fine particle, which has a mass-based median diameter in a centrifugal sedimentation method within a range of from 0.05 μm to 0.3 μm,
wherein the hydrophobized spherical polyalkylsilsesquioxane fine particle has a disintegration strength in a crushing strength measurement method of 0.20 N or less.