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    • 5. 发明授权
    • Backside protective overcoat compositions for silver halide photographic
elements
    • 用于卤化银照相元件的背面保护性外涂层组合物
    • US6153368A
    • 2000-11-28
    • US431729
    • 1999-11-01
    • Dwight W. SchwarkYongcai WangCharles C. Anderson
    • Dwight W. SchwarkYongcai WangCharles C. Anderson
    • G03C1/76G03C1/89G03C1/93
    • G03C1/7614Y10S430/162
    • A photographic element which includes a support having a frontside and a backside, at least one silver halide emulsion layer superposed on the frontside of the support; and a protective overcoat layer superposed on the backside of the support. The protective overcoat layer is formed from a coating solution comprising a continuous liquid organic medium having therein a mixture of dispersed core/shell polymer particles and a soluble polymer. The core/shell polymer particles comprise a core portion, which is insoluble in the organic medium, and a shell portion which has an affinity for both the core portion and the organic medium and has an acid number of from 25 to 200. The soluble polymer has an acid number of from 70 to 500 and the acid number of the soluble polymer is greater than the acid number of the shell of the core/shell polymer particles.
    • 一种照相元件,其包括具有前侧和后侧的支撑体,叠置在支撑体的前侧上的至少一个卤化银乳剂层; 以及重叠在支撑体的背面上的保护性外涂层。 保护性外涂层由包含其中具有分散的核/壳聚合物颗粒和可溶性聚合物的混合物的连续液体有机介质的涂布溶液形成。 核/壳聚合物颗粒包含不溶于有机介质的核心部分和对芯部分和有机介质两者具有亲和力并且酸值为25至200的壳部分。可溶性聚合物 酸值为70〜500,可溶性聚合物的酸值大于核/壳聚合物粒子的壳的酸值。