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    • 17. 发明授权
    • Method for developing positive acting light-sensitive planographic
printing plate
    • 正性光敏平版印刷版的开发方法
    • US4259434A
    • 1981-03-31
    • US145105
    • 1980-04-30
    • Kotaro YamasueHiroshi TakahashiHirokazu SakakiAkira Nishioka
    • Kotaro YamasueHiroshi TakahashiHirokazu SakakiAkira Nishioka
    • G03F7/32G03F7/02
    • G03F7/322
    • A development method which comprises imagewise exposing a positive acting light-sensitive planographic printing plate comprising an aluminum support and a light-sensitive layer of an o-quinonediazide compound formed thereon, and then developing the exposed plate with a developer, comprising an aqueous solution of an alkali metal silicate, adding a supplementary solution comprising an aqueous solution of an alkali metal silicate to the developer to compensate for the degradation of the developer brought about by development and/or by carbon dioxide in the air; wherein the developer comprises an aqueous solution of an alkali metal salt having an [SiO.sub.2 ]/[M] ratio of from 0.5 to 0.75 and an SiO.sub.2 concentration of from 1 to 4% by weight based on the total weight of the developer, where [SiO.sub.2 ] represents the concentration of SiO.sub.2 per unit volume expressed as gram-molecules, and [M] represents the concentration of the alkali metal per unit volume expressed as gram-atoms, and the supplementary solution comprises an aqueous solution of an alkali metal silicate having an [SiO.sub.2 ]/[M] ratio of from 0.25 to 0.75.
    • 一种显影方法,其包括成像曝光包含铝载体和形成在其上的邻醌二叠氮化合物的感光层的正性光敏平版印刷版,然后用显影剂将曝光的板显影, 碱金属硅酸盐,将含有碱金属硅酸盐水溶液的补充溶液加入到显影剂中以补偿由显影产生的显影剂和/或二氧化碳在空气中的降解; 其中显影剂包含基于显影剂总重量的[SiO 2] / [M]比为0.5至0.75和SiO 2浓度为1至4重量%的碱金属盐的水溶液,其中[ SiO 2]表示以克分子表示的每单位体积的SiO 2浓度,[M]表示以克原子表示的每单位体积的碱金属的浓度,补充溶液包含碱金属硅酸盐的水溶液, 0.25〜0.75的[SiO 2] / [M]比。