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    Photosensitive silver halide material for obtaining half-tone black-and-white images and method for half-tone high-contrast reproduction
    2.
    发明授权
    Photosensitive silver halide material for obtaining half-tone black-and-white images and method for half-tone high-contrast reproduction 失效
    用于获得半色调黑白图像的感光卤化银材料和用于半色调高对比度再现的方法

    公开(公告)号：US4659647A

    公开(公告)日：1987-04-21

    申请号：US807285

    申请日：1985-12-10

    申请人： Alberto Vacca ,  Angelo Vallarino

    发明人： Alberto Vacca ,  Angelo Vallarino

    IPC分类号： G03C1/04 ,  G03C1/035 ,  G03C1/053 ,  G03C1/06 ,  G03C1/09 ,  G03C1/34

    CPC分类号： G03C1/035 ,  G03C1/053 ,  G03C1/34 ,  G03C2001/03517 ,  G03C2200/06 ,  G03C2200/38 ,  Y10S430/15

    摘要： A photosensitive silver halide material for obtaining black and white half-tone dot or line images comprises a fine grain and high-chloride silver halide emulsion reactively associated with an aqueous latex of a hydrophobic vinyl addition polymer in combination with a stabilizer selected from the group consisting of 4-hydroxy-1,3,3a,7-tetrazaindenes, benzotriazoles and benzimidazoles. The silver halide emulsion has an average grain size lower than or equal to 0.20 micron with at least 60% of its molar halide content consisting of chloride ions.The material allows high-contrast and high resolving power images to be obtained.The material has a good developability in photographic processings and this reduces the development times and increases productivity.

    摘要翻译： 用于获得黑白色半色调点或线图像的感光卤化银材料包括与疏水性乙烯基加成聚合物的水性胶乳反应性相关的细晶粒和高氯化物卤化银乳剂，其与选自以下的稳定剂组合： 的4-羟基-1,3,3a，7-四唑烷酮，苯并三唑和苯并咪唑。 卤化银乳剂的平均粒度小于或等于0.20微米，其卤化物含量的至少60％由氯离子组成。 该材料可以获得高对比度和高分辨率的图像。 该材料在照相处理中具有良好的显影性，并且这减少了显影时间并且提高了生产率。

    Process for the production of photosensitive silver halide emulsions
    3.
    发明授权
    Process for the production of photosensitive silver halide emulsions 失效
    生产感光银盐乳液的方法

    公开(公告)号：US5169750A

    公开(公告)日：1992-12-08

    申请号：US595032

    申请日：1990-10-10

    申请人： Alberto Vacca

    发明人： Alberto Vacca

    IPC分类号： G03C1/015 ,  G03C1/025

    CPC分类号： G03C1/015

    摘要： An improved process for preparing silver halide emulsions by precipitation of silver halide grains in a single reaction vessel comprising a dispersing medium is disclosed. The process comprises forming a silver halide emulsion by adding silver salt and halide salt solutions in a dispersing medium contained in a reaction vessel to form silver halide nuclei and allowing said silver halide nuclei to grow in said reaction vessel. The improvement comprises, during a pause of addition of silver salt and halide salt solutions, reducing the volume of silver halide emulsion by continuously delivering the silver halide emulsion to a cleaning stage for the partial removal of dispersing medium and any salt soluble therein and returning the silver halide emulsion to the reaction vessel.

    Negative-acting silver halide photographic elements having extended UV exposure latitude
    4.
    发明授权
    Negative-acting silver halide photographic elements having extended UV exposure latitude 失效
    具有延长UV曝光宽容度的负性卤化银照相元件

    公开(公告)号：US5316901A

    公开(公告)日：1994-05-31

    申请号：US912777

    申请日：1992-07-13

    申请人： Alberto Vacca ,  Aldo Sgarbi

    发明人： Alberto Vacca ,  Aldo Sgarbi

    IPC分类号： G03C1/06 ,  G03C1/08 ,  G03C1/43 ,  G03C1/815

    CPC分类号： G03C1/8155 ,  Y10S430/132

    摘要： UV-sensitive negative acting silver halide photographic elements for contact processes which can be safely handled under white light and have increased UV exposure latitude, said elements comprising a support base, a hydrophilic colloidal silver halide emulsion layer comprising UV sensitive negative acting silver halide grains, and one or more hydrophilic colloidal layers, wherein said silver halide emulsion is reactively associated with a water-removable UV-absorbing compound having at least 80% of the absorption in the range from 350 to 400 micronmeter.

    摘要翻译： 用于接触过程的紫外线敏感的负性卤化银照相元件，其可以在白光下安全地处理并具有增加的紫外线曝光宽容度，所述元件包括支撑基底，包含UV敏感的负性卤化银颗粒的亲水性胶体卤化银乳剂层， 和一种或多种亲水性胶体层，其中所述卤化银乳剂与具有至少80％吸收值在350至400微米计之间的水可去除的UV吸收化合物反应地相关。

    Method of preparing silver halide photographic emulsions
    6.
    发明授权
    Method of preparing silver halide photographic emulsions 失效
    制备卤化银照相乳剂的方法

    公开(公告)号：US5486451A

    公开(公告)日：1996-01-23

    申请号：US285938

    申请日：1994-08-04

    申请人： Alberto Vacca ,  Paolo Barletta

    发明人： Alberto Vacca ,  Paolo Barletta

    IPC分类号： G03C1/015 ,  G03C1/053 ,  G03C1/047 ,  G03C11/06

    CPC分类号： G03C1/053 ,  G03C1/015

    摘要： A method is disclosed of preparing washed silver halide photographic emulsions wherein silver halide grain formation is effected in the presence of an acid-coagulable gelatin derivative or a mixture of gelatin and an acid-coagulable gelatin derivative and coagulation of the emulsion occurs in the presence of ionic copolymers of styrene sulfonic acid and maleic acid.

    摘要翻译： 公开了一种制备洗涤的卤化银照相乳剂的方法，其中卤化银颗粒的形成是在酸凝固性明胶衍生物或明胶与酸凝固性明胶衍生物的混合物存在下进行的，并且乳液的凝结是在存在 苯乙烯磺酸和马来酸的离子共聚物。