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    • 6. 发明授权
    • Negatively charged toner for use in electrostatography
    • 用于静电放电的负电荷调色剂
    • US5622803A
    • 1997-04-22
    • US356236
    • 1994-12-14
    • Serge TavernierWerner Op de BeeckJean-Marie DewanckelePeter Van Rompuy
    • Serge TavernierWerner Op de BeeckJean-Marie DewanckelePeter Van Rompuy
    • G03G9/08G03G9/087G03G9/097
    • G03G9/08759G03G9/0823G03G9/08797G03G9/09741G03G9/0975G03G9/09758
    • A dry toner powder the toner particles of which are triboelectrically negatively charged and are suited for development of an electrostatic charge pattern, wherein said toner particles contain:(1) at least one triboelectrically negatively chargeable thermoplastic resin serving as binder having a volume resistivity of at least 10.sup.13 .OMEGA.-cm, and(2) at least one resistivity lowering substance being an onium compound having a volume resistivity lower than the volume resistivity of said binder, and said toner particles are free from non-resinous charge-controlling agent(s) providing negative triboelectric chargeability,wherein said substance(s) (2) is (are) capable of lowering the volume resistivity of said binder by a factor of at least 3.3 when present in said binder in a concentration of 5% by weight relative to the weight of said binder, andwherein said toner powder containing toner particles including a mixture of said ingredients (1) and (2) under triboelectric charging conditions is capable of obtaining an absolute median (q/d) charge/diameter value (x) lower than 10 fC/10 .mu.m but not lower than 1 fC/10 .mu.m, and said toner powder under the same triboelectric charging conditions but free from said substance(s) (2) then has an absolute median q/d value (x) at least 50% higher than when said substance(s) (2) is (are) present, and wherein the distribution of the charge/diameter values of the individual toner particles is characterized by a coefficient of variation .nu..ltoreq.0.33.
    • PCT No.PCT / EP94 / 01310 Sec。 371日期1994年12月14日第 102(e)日期1994年12月14日PCT 1994年4月25日PCT PCT。 WO94 / 27191 PCT出版物 日期1994年11月24日一种其调色剂颗粒为摩擦带电带电并适于显影静电荷图案的干燥调色剂粉末,其中所述调色剂颗粒包含:(1)至少一种用作粘合剂的摩擦带电性带负电荷的热塑性树脂, 体积电阻率为至少1013欧姆 - 厘米,和(2)至少一种电阻率降低物质是体积电阻率低于所述粘合剂的体积电阻率的鎓化合物,并且所述调色剂颗粒不含非树脂电荷 - 提供负摩擦带电性的控制剂,其中所述物质(2)当以5%的浓度存在于所述粘合剂中时能够将所述粘合剂的体积电阻率降低至少3.3倍, ,并且其中所述调色剂粉末含有包含所述成分(1)和(2)的混合物的调色剂颗粒在摩擦电 充电条件能够获得低于10fC /10μm但不低于1fC /10μm的绝对中值(q / d)电荷/直径值(x),并且所述调色剂粉末在相同的摩擦带电条件 但没有所述物质(2)的绝对中值q / d值(x)比所述物质(2)存在时高出至少50%,并且其中 单个调色剂颗粒的电荷/直径值的特征在于变异系数nu <0.33。
    • 7. 发明授权
    • Method for making direct-positive photographic images
    • 制作直摄摄影图像的方法
    • US5449595A
    • 1995-09-12
    • US267410
    • 1994-06-29
    • Jean-Marie DewanckeleDavid TerrellKris Viaene
    • Jean-Marie DewanckeleDavid TerrellKris Viaene
    • G03C1/295C07D487/04G03C1/485G03C5/50
    • C07D487/04G03C1/48538G03C1/48561Y10S430/141
    • The present invention relates to a method for making direct-positive photographic images by developing light-sensitive materials in the presence of development nucleators which do not cause loss of sensitivity during exposure or unevenness of development. More specifically the invention relates to the formation of direct-positive images having a high maximum density and high exposure latitude and to photographic materials for use in said formation, which is accomplished by a method for making direct-positive images comprising:image-wise exposing a photographic light-sensitive silver halide material comprising a support and a layer of an internal latent image-type silver halide emulsion, the pAg of which has been adjusted to a pAg-value between 9.0 and 10.5 inclusive before coating, anddeveloping said exposed photographic silver halide material in a surface developer in the presence of a development nucleator with a group promoting adsorption to silver halide.It has been found that in a particular embodiment of this invention a development-nucleating amount of a hydrazine compound with a 7-hydroxy-s-triazolo-[1,5-a]-pyrimidine group as group promoting adsorption to silver halide is very useful.
    • 本发明涉及通过在显影成核剂的存在下开发感光材料来制造直接正性照相图像的方法,其不会在曝光或显影不均匀期间引起敏感性的损失。 更具体地,本发明涉及形成具有高最大密度和高曝光宽容度的直接正像,以及用于所述地层中的照相材料,其通过用于制造直接正像的方法来实现,包括:图像曝光 一种照相感光卤化银材料,其包含载体和一层内部潜像型卤化银乳剂,其pAg已被调节至涂覆前的9.0和10.5之间的pAg值,并显影所述曝光的照相 卤化银材料在显影成核剂存在下在表面显影剂中具有促进对卤化银吸附的基团。 已经发现,在本发明的一个具体实施方案中,显影成核量的具有7-羟基-s-三唑并 - [1,5-a] - 嘧啶基的肼化合物作为促进对卤化银吸附的基团是非常 有用。
    • 10. 发明授权
    • Method for making negative lith images direct positive images
    • 制造负像图像的方法直接呈现正像
    • US5691121A
    • 1997-11-25
    • US680358
    • 1996-07-15
    • Jean-Marie DewanckeleDavid TerrellHieronymus AndriessenKris Viaene
    • Jean-Marie DewanckeleDavid TerrellHieronymus AndriessenKris Viaene
    • G03C1/06G03C1/485G03C1/73
    • G03C1/48546G03C1/067Y10S430/141
    • A photographic light-sensitive silver halide material is provided for making negative lithographic images or direct-positive images, said material comprising a support, at least one internal latent image-type silver halide emulsion layer (in the case of direct-positive materials) or surface latent image-type silver halide emulsion layer (in the case of lithographic materials) and development-nucleating amounts of a compound or a precursor thereof, said compound having at least one quaternary heterocyclic ring system comprising at least three rings including a tetrahydropyridinium ring wherein carbon-nitrogen and carbon-carbon double bonds are also part of an aromatic ring being one of said three rings and wherein said double bonds and nitrogen atom in said tetrahydropyridinium ring are incorporated into annelated conjugated ring systems. Developing said photographic material after exposure in an alkaline surface developer rapidly converts said precursor into a ring system as defined hereinbefore.
    • 提供摄影感光卤化银材料,用于制作负性平版印刷图像或直接正像,所述材料包括载体,至少一个内部潜像型卤化银乳剂层(在直接正极材料的情况下)或 表面潜像型卤化银乳剂层(在平版印刷材料的情况下)和显影成核量的化合物或其前体,所述化合物具有至少一个四元杂环系统,其包含至少三个包括四氢吡啶鎓环的环,其中 碳 - 氮和碳 - 碳双键也是作为所述三个环之一的芳香环的一部分,并且其中所述四氢吡啶鎓环中的所述双键和氮原子并入到环状共轭环体系中。 在碱性表面显影剂中曝光后显影所述照相材料快速地将所述前体转化成如上所定义的环系。