首页>
外国专利>
Hydrophobized spherical polyalkylsilsesquioxane fine particles, external additive for toner, dry toner for electrophotography, and method for producing hydrophobized spherical polyalkylsilsesquioxane fine particles
Hydrophobized spherical polyalkylsilsesquioxane fine particles, external additive for toner, dry toner for electrophotography, and method for producing hydrophobized spherical polyalkylsilsesquioxane fine particles
Provided are a polyalkylsilsesquioxane fine particle having hydrophobicity and having a small particle diameter, an external additive for toner and a dry toner for electrophotography each using the same, and a method of manufacturing a hydrophobized spherical polyalkylsilsesquioxane fine particle. The hydrophobized spherical polyalkylsilsesquioxane fine particle has a mass-based median diameter in a centrifugal sedimentation method within the range of from 0.05 µm to 0.3 ¼m. The fine particle is produced through, for example, at least a process involving: mixing a raw material solution prepared using an alkyltrialkoxysilane with an alkaline aqueous medium to obtain a polycondensation reaction liquid; mixing the polycondensation reaction liquid with an aqueous solution to obtain a fine particle dispersion liquid; and blending a hydrophobizing agent in the fine particle dispersion liquid.
展开▼