Homogeneous single-part photographic color developing concentrate and method of making
    4.
    发明公开
    Homogeneous single-part photographic color developing concentrate and method of making 有权
    均匀的单组分照相彩色显影浓缩物和制备方法

    公开(公告)号:EP0980024A2

    公开(公告)日:2000-02-16

    申请号:EP99202525.4

    申请日:1999-07-30

    IPC分类号: G03C7/407

    CPC分类号: G03C7/413 G03C5/266

    摘要: An aqueous, homogeneous, single-part color developing concentrate comprises a color developing agent in free base form, an antioxidant for the color developing agent, a buffering agent, and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent present in an a concentration such that the weight ratio of water to the organic solvent is from 15:85 to 50:50. This composition is prepared in a unique manner, namely by combining the noted components, and removing the sulfate anions commonly present in color developing agents by precipitation with alkali metal ions, before addition of further components. The concentrate can be used to make a working strength processing solution, or it can be used as a replenishing composition with proper dilution.

    摘要翻译: 含水均匀单组分彩色显影浓缩物包含游离碱形式的彩色显影剂,用于彩色显影剂的抗氧化剂,缓冲剂和水混溶性或水溶性羟基取代的直链有机 溶剂,其浓度使得水与有机溶剂的重量比为15:85至50:50。 该组合物以独特的方式制备,即通过组合所述组分,并且在加入其它组分之前通过用碱金属离子沉淀除去通常存在于彩色显影剂中的硫酸根阴离子。 该浓缩物可用于制备工作强度处理溶液,或者其可以适当稀释作为补充组合物使用。