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    • 5. 发明授权
    • Dry toner for high speed electrophotography
    • 用于高速电子照相的干粉
    • US5185229A
    • 1993-02-09
    • US643935
    • 1991-01-22
    • Haruhiko SatoKatsuaki KidaAkio Kashihara
    • Haruhiko SatoKatsuaki KidaAkio Kashihara
    • G03G9/08G03G9/087
    • G03G9/08795G03G9/0825G03G9/08797
    • Dry toner for electrophotography in the form of colored particles, each particle being composed of a colored core portion having an average diameter of 5 to 20.mu. and comprising as main ingredients, a coloring material and heat-meltable resin having a flow initiation temperature of 120.degree. C. to 160.degree. C., and a covering shell portion of a vinyl resin mixture of a comparatively low molecular weight component and a high molecular weight component, each having the maximum value in the molecular weight distribution curve obtained by gel-permeation chromatography of 8.times.10.sup.3 to 3.times.10.sup.4 and 8.times.10.sup.4 to 5.times.10.sup.5, respectively, and present in a ratio of Mw/Mn=5.0 or more; the weight ratio of said vinyl resins to the total weight of said core and shell portions being 8 to 25% by weight. The present dry toner is particularly useful for use in a high speed electrography.
    • 用于电子照相的干燥调色剂为有色颗粒的形式,每个颗粒由平均直径为5至20μm的着色芯部分组成,并且包含作为主要成分的着色材料和热熔树脂,其流动起始温度为120 ℃至160℃,以及通过凝胶渗透色谱法获得的分子量分布曲线中具有最大值的较低分子量组分和高分子量组分的乙烯基树脂混合物的覆盖壳部分 分别为8×10 3〜3×10 4和8×10 4〜5×10 5,以Mw / Mn = 5.0以上的比率存在。 所述乙烯基树脂与所述核和壳部分的总重量的重量比为8至25重量%。 本发明的干燥调色剂特别适用于高速电摄影。