| 摘要 |
PURPOSE:To obtain a magnetic toner formed by strongly uniting a magnetic powder with an org. polymer by polymerizing a radically polymerizable vinyl monomer in a polymer dispersing a magnetic powder in the presence of a specified carboxylic acid monomer. CONSTITUTION:A magnetic powder is strongly united with an org. polymer by polymerizing a radically polymerizable vinyl monomer in a polymer dispersing a magnetic powder in the presence of a carboxylic acid monomer represented by formula I in which R1-R3 are each H, alkyl, or the like, and X, Y, Z are each H, NH4, or the like; or by formula II in which R4, R5 are each H, alkyl, or the like. The relative action thus formed between the polymer and the surface of the magnetic powder exceeds adhesion due to adsorption, etc. in strength and unites with each other very fast. The presence of a polymer having a medium elasticity between the magnetic powder and a material greatly different in elasticity from each other smooths transmission of stress and provides a magnetic toner exhibiting superior mechanical characteristics. |
