| 摘要 |
PURPOSE:To obtain a liquid developer having good image quality at a high image density by providing a resin coating formed by a flushing method to a coloring agent and formulating the resin so as to satisfy prescribed conditions. CONSTITUTION:Formation of the resin coating on the coloring agent by the flushing method is executed by thoroughly stirring carbon black or the carbon black and org. pigment such as nigrosine or aq. dispersion contg. the org. pigment by a kneader known as a flusher, adding the resin thereto, continuing stirring the liquid under heating, subjecting the mixture to a pressure reduction to remove moisture, cooling the mixture and pulverizing the same. The liquid developer for electrostatic photography prepd. in such a manner consists of PE wax having 60-130 deg.C softening point and <=1.0KOHmg/g acid value and ethylene/vinyl acetate copolymer and the weight ratio of the coloring agent and the resin satisfies the conditions of 20:80-50:50. |
