| 摘要 |
<p>PURPOSE:To obtain uniform electrification property and to obtain high-density sharp image by producing aggregation of coloring polymer primary particles by using quaternary ammonium salt compd. to obtain specified particles and then heating the obtd. particles at temp. higher than the glass transition temp. of the resin used. CONSTITUTION:The production method includes a process to disperse primary particles consisting of at least a pigment and resin in water-base medium, a process to add quaternary ammnonium salt compd. into the water-base medium to aggreagate the primary particles, and a process to form secondary particles by heating the aggregate. In this method, the resin used for the primary particles is a polymer such as styrene resin, acryl resin, and polyester resin or copolymers of these, and any well-known material can be used. It is preferable to use polyester resin. As for the dispersant to disperse the pigment particles, any well-knwon material such as nonion surfactant, anion surfactant, and cation surfactant can be used.</p> |
