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    • 76. 发明授权
    • Carrier for electrostatic image developer and process for the production
thereof
    • 静电图像显影剂用载体及其制造方法
    • US5376488A
    • 1994-12-27
    • US51881
    • 1993-04-26
    • Ken OhmuraShigenori KounoTomoyasu Umeno
    • Ken OhmuraShigenori KounoTomoyasu Umeno
    • G03G9/113G03G9/083
    • G03G9/1131G03G9/1134G03G9/1138
    • A carrier of developer for developing an electrostatic image and a method for producing the carrier are disclosed. The carrier comprises core particles each having a resin layer covering the surface of said core particle. The resin layer is formed by dry process in which the core particles are stirred together with fine resin particles with no solvent for the resin to form the resin layer on the surface of each core particle. The fine resin particles comprise a homopolymer or a copolymer comprising a fluorinated acrylate repeating unit and are formed by emulsified polymerization carried out in the presence of a surfactant comprising an alkylbenzene sulfonic compound, and the residual amount of the surfactant in the fine resin particles is within the range of from 60 ppm to 10,000 ppm. The carrier is improved in adhesion between the surface of the core and the resin layer and satisfactory in friction electricity providing capability.
    • 公开了用于显影静电图像的显影剂的载体和用于制造载体的方法。 载体包括各自具有覆盖所述核心颗粒表面的树脂层的芯颗粒。 通过干法制造树脂层,其中核颗粒与树脂颗粒一起搅拌,没有溶剂用于树脂,以在每个芯颗粒的表面上形成树脂层。 细树脂颗粒包含均聚物或包含氟化丙烯酸酯重复单元的共聚物,并且通过在包含烷基苯磺酸化合物的表面活性剂存在下进行乳化聚合而形成,并且细树脂颗粒中的表面活性剂的残留量在 范围从60ppm到10,000ppm。 载体在芯的表面和树脂层之间的粘附性得到改善,并且具有令人满意的摩擦电力提供能力。