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    • 42. 发明授权
    • Liquid developer for electrostatic photography
    • 静电摄影用液体显影剂
    • US5344694A
    • 1994-09-06
    • US885353
    • 1992-05-19
    • Seiji HorieKenji SanoNobuo SuzukiSyu Watarai
    • Seiji HorieKenji SanoNobuo SuzukiSyu Watarai
    • G03G5/05G03G9/13B32B9/00
    • G03G5/0521G03G9/131G03G9/133Y10T428/24802
    • A liquid developer for electrostatic photography, said liquid developer comprising resin particles dispersed in a non-aqueous solvent having a volume resistivity of at least 10.sup.9 .OMEGA.cm, said dispersed resin particles being obtained by polymerizing(a) at least one member of methyl methacrylate and ethyl methacrylate soluble in said non-aqueous solvent and(b) at least one member selected from the group consisting of acrylic esters and methacrylic esters having an alkyl group having not more than 4 carbon atoms, said esters being soluble in said non-aqueous solvent, but being made insoluble by polymerization,said components (a) and (b) being polymerized in the presence of a dispersion stabilizing resin which is soluble in said non-aqueous solvent, and said dispersion stabilizing resin comprising a graft copolymer formed by polymerizing(i) at least one member of macromonomers (M) having a weight-average molecular weight of 1.times.10.sup.3 to 4.times.10.sup.4, said macromonomers (M) having a polymerizable double bond containing group represented by the formula (I) defined in the specification bonded to one terminal of the main polymer chain, said macromonomers (M) containing at least one member of polymer components represented by formula (II) defined in the specification in the main chain thereof, and(ii) at least one member of monomers represented by formula (III) as defined in the specification,said monomers (a) and (b) being made insoluble by polymerization.
    • 一种用于静电摄影的液体显影剂,所述液体显影剂包括分散在体积电阻率为至少10 9欧米亚厘米的非水溶剂中的树脂颗粒,所述分散的树脂颗粒通过聚合(a)至少一种甲基丙烯酸甲酯和 可溶于所述非水溶剂的甲基丙烯酸乙酯和(b)选自具有不超过4个碳原子的烷基的丙烯酸酯和甲基丙烯酸酯的至少一种,所述酯可溶于所述非水溶剂 但是通过聚合使其不溶,所述组分(a)和(b)在可溶于所述非水溶剂的分散体稳定树脂的存在下聚合,所述分散体稳定树脂包含通过聚合形成的接枝共聚物 i)至少一种重均分子量为1×10 3至4×10 4的大分子单体(M)的成员,所述大分子单体(M)具有可聚合的 所述大分子单体(M)含有在本说明书中定义的至少一种由式(II)表示的聚合物组分的组分中的至少一种聚合物组分, 其主链,和(ii)说明书中定义的至少一种由式(III)表示的单体,所述单体(a)和(b)通过聚合而不溶解。