Method for temporarily coloring of an article with acid labile colorant
    2.
    发明公开
    Method for temporarily coloring of an article with acid labile colorant 失效
    Verfahren zur zeitwertigenFärbungvon einem Artikel mitsäureinstabilemFarbstoff。

    公开(公告)号:EP0479446A1

    公开(公告)日:1992-04-08

    申请号:EP91308429.9

    申请日:1991-09-16

    摘要: An article may be temporarily colored by application of an aqueous solution of a polyoxyalkylene substituted chromophore characterized by a C = N pair with an electron withdrawing group bonded to one element of the pair and an electron donating group bonded to the opposite element. The polyoxyalkylene substituent imparts solubility to the colorant and bulk to prevent penetration into interstices in the article being colored. The colorant may be subsequently decolorized by hydrolysis when an aqueous acid solution is applied to the colorant.

    摘要翻译: 可以通过施加聚氧亚烷基取代的发色团的水溶液来暂时着色物品,其特征在于具有与该对的一个元素键合的吸电子基团的C = N对,以及与相对的元件结合的给电子基团。 聚氧化烯取代基赋予着色剂和体积的溶解性,以防止渗入被着色的制品中的间隙。 当着色剂施加酸性水溶液时,着色剂可随后通过水解脱色。