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    • 16. 发明授权
    • Radiation-sensitive compositions comprising a photocrosslinkable
polymer, a leuco dye, a photooxidant and a heteroaromatic amine n-oxide
    • 包含光可交联聚合物,无色染料,光氧化剂和杂芳族胺n氧化物的辐射敏感组合物
    • US5141842A
    • 1992-08-25
    • US676131
    • 1991-03-27
    • James E. MitchellPaul R. WestPaul R. Josephson, Jr.
    • James E. MitchellPaul R. WestPaul R. Josephson, Jr.
    • C07D213/89C07D215/60C07D219/02G03F7/038
    • C07D213/89C07D215/60C07D219/02G03F7/0384
    • Radiation-sensitive compositions which are especially useful in the production of negative-working lithographic printing plates comprise a photocrosslinkable polymer, containing the photosensitive group ##STR1## as an integral part of the polymer backbone, and a print-out composition which produces an optical density difference upon exposure to activating radiation and thereby enables the exposed image on the printing plate to be seen before the plate is processed. The print-out composition comprises a leuco form of a dye having one or more removable hydrogen atoms, the removal of which forms a compound colored differently from the leuco form; a photooxidant which has a photoscissionable nitrogen-oxygen bond, the photooxidant serving to convert the leuco dye to the differently colored form when the composition is exposed to activating radiation; and a heteroaromatic amine N-oxide which functions to improve the photo-efficiency of the print-out composition and thereby increase the print-out density.
    • 特别可用于制备负性平版印刷版的辐射敏感性组合物包括含有作为聚合物主链的组成部分的光敏基团“IMA”的光可交联聚合物,以及产生光密度的印刷组合物 在曝光到激活辐射之后的差异,从而使得在板被处理之前可以看到在印版上的曝光图像。 印刷组合物包含具有一个或多个可移除氢原子的染料的无色形式,其去除形成与无色形式不同的化合物; 具有可分离的氮 - 氧键的光氧化剂,当组合物暴露于活化辐射时,该光氧化剂用于将无色染料转化为不同颜色的形式; 以及用于提高印刷组合物的光效率并因此增加印刷出密度的功能的杂芳族胺N-氧化物。