Disclosed a process for the preparation of polymer particles, which comprises suspending a polymerizable monomer, a radical initiator and a hardly soluble inorganic dispersant in a dispersion medium and carrying out polymerization in this state, wherein a hardly soluble inorganic dispersant, the solubility of which is changed according to the pH value in the dispersion medium and which is precipitated at a pH value within a certain pH value region of the dispersion medium, is used as the dispersant, suspension of the polymerizable monomer in the dispersion medium is carried out in the state where the dispersant is dissolved in the dispersion medium, an acid or base is then added to adjust the pH value of the dispersion medium to a predetermined level to precipitate the dispersant, and the polymerization is initiated in the state where oil drops having a fine particulate size are formed.
The process is effectively utilized for obtaining a toner having good flowability and blocking resistance and excellent developing and fixing properties by using a colorant together with the polymerizable monomer.
本发明公开了一种用于制备聚合物颗粒的工艺,该工艺包括将可聚合单体、自由基
引发剂和难溶性无机分散剂悬浮于分散介质中,并在此状态下进行聚合反应,其中难溶性无机分散剂的溶解度随分散介质中的 pH 值而改变,并在分散介质的某一 pH 值区域内沉淀、使用分散剂,在分散剂溶解于分散介质的状态下将可聚合单体悬浮于分散介质中,然后加入酸或碱将分散介质的 pH 值调节到预定
水平以沉淀分散剂,在形成细颗粒油滴的状态下开始聚合。
通过将
着色剂与可聚合单体一起使用,可有效利用该工艺获得具有良好流动性和抗阻塞性以及优异显影和定影性能的调色剂。