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    • 4. 发明申请
    • IMAGING PROCESS
    • 成像过程
    • WO1991012139A1
    • 1991-08-22
    • PCT/GB1991000195
    • 1991-02-07
    • COURTAULDS PLCSAMBROOK-SMITH, Colin, PeterHAWKINS, Michael
    • COURTAULDS PLC
    • B41M03/14
    • G03C5/56B41M3/142
    • A process for imaging a film containing a reversible organic photochromic compound comprises exposing the film to UV light in one or more selected areas followed by treating it with a chemical reagent which reacts irreversibly with only the relatively colourless form of the photochromic compound. An alternative process comprises exposing the film to UV light and the chemical reagent followed by exposing it to high-frequency light in one or more selected areas to cause irreversible reaction. Preferably the photochromic compound contains a cyclic carboxylic acid anhydride ring and the reagent is ammonia or an amine. The imaged films are useful as security markings.
    • 在含有可逆有机光致变色化合物的膜上形成图像的方法包括在一个或多个选定区域中将所述膜暴露于UV光,然后用调节 只有相对无色的光致变色化合物才是不可逆的。 另一种方法是将薄膜暴露在紫外光和化学试剂中,然后将其暴露于一个或多个选定区域的高频光线下,引起不可逆反应。 光致变色化合物优选含有无水环状羧酸环,反应物是氨或胺。 图像胶片可以有利地用作安全标记。