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    • 89. 发明授权
    • Liquid developers and toner aggregation processes
    • 液体显影剂和调色剂聚集过程
    • US5536615A
    • 1996-07-16
    • US498206
    • 1995-07-05
    • Michael A. HopperRaj D. PatelGrazyna E. Kmiecik-LawrynowiczPeter G. OdellBernard GrushkinGeorge A. Gibson
    • Michael A. HopperRaj D. PatelGrazyna E. Kmiecik-LawrynowiczPeter G. OdellBernard GrushkinGeorge A. Gibson
    • G03G9/08G03G9/12G03G9/135G03G9/13
    • G03G9/12G03G9/0804G03G9/0819G03G9/1355
    • A process for the preparation of liquid developers comprising:(i) preparing a pigment dispersion, which dispersion is comprised of a pigment, and an ionic surfactant;(ii) shearing said pigment dispersion with a latex or emulsion blend comprised of a nonionic surfactant, resin, and a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and optionally adding further anionic, or nonionic surfactant to stabilize the aggregates obtained in (iii);(iii) heating the above resulting sheared aqueous blend below about the glass transition temperature (Tg) of the resin to form toner size aggregates with a narrow particle size distribution;(iv) heating said bound aggregates above about the Tg of the resin to form toner size particles in an aqueous medium and which particles possess a narrow particle size distribution; and(v) separating from the aqueous medium toner particles of resin and pigment, and dispersing said toner particles in a carrier fluid.
    • 一种用于制备液体显影剂的方法,包括:(i)制备颜料分散体,该分散体由颜料和离子表面活性剂组成; (ii)用包含非离子表面活性剂,树脂和抗衡离子表面活性剂的胶乳或乳液共混物剪切所述颜料分散体,所述非离子表面活性剂,树脂和所述离子表面活性剂的电荷极性与所述离子表面活性剂具有相反的电荷极性, (iii)中得到的聚集体; (iii)将上述所得的剪切含水混合物加热到低于树脂的玻璃化转变温度(Tg)的温度以形成具有窄粒度分布的调色剂尺寸聚集体; (iv)将所述结合的聚集体加热到树脂的Tg附近,以在水性介质中形成调色剂颗粒,并且该颗粒具有窄的粒度分布; 和(v)从水性介质中分离树脂和颜料的调色剂颗粒,并将所述调色剂颗粒分散在载体流体中。