| 摘要 |
<p>PURPOSE: To provide a metal oxide powder having both of high hydrophobicity and good fluidity, and an electrophotographic developer containing this powder stable in chargeability. CONSTITUTION: This metal oxide powder is covered with a mixture of an acidic compound and an organopolysiloxane and this powder has a hydrophobicity of >=80% measured by the permeability method, and it is made of silica, alumina, or titania. This organopolysiloxane has as a functional group one of an alkyl, hydroxyl, ether, and carboxylic groups, and this metal oxide powder is used as the electrophotographic developer.</p> |
