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    • 6. 发明申请
    • ROTOGRAVURE PRINTING PROCESSES FOR PRODUCING OPTICALLY VARIABLE SECURITY FEATURES
    • 用于生产光学可变安全特性的ROTOGRAVURE印刷工艺
    • WO2015055504A1
    • 2015-04-23
    • PCT/EP2014/071665
    • 2014-10-09
    • SICPA HOLDING SA
    • GARNIER, ChristopheVUILLEUMIER, LucienPASQUIER, Cécile
    • B41M3/14B41M1/10
    • B42D25/364B41F11/02B41M1/10B41M3/148B42D25/23B42D25/29B42D25/355B42D25/44C09D11/03C09K19/3809C09K19/3861C09K19/588C09K2019/0448C09K2019/3408
    • The present invention is related to the filed of optically variable security elements comprising a region based on a single cured ink comprising a cholesteric liquid crystal polymer, said region having at least two, preferably at least three, patterns exhibiting, at at least one viewing angle, a different CIE (1976) color index parameter and/or a different position of the selective reflection band for protecting security documents against counterfeiting and/or illegal reproduction. In particular, the present invention relates to processes for manufacturing said features, when the processes comprises the steps of a) applying on a substrate by a rotogravure process with the use of a gravure cylinder having at least two, preferably at least three, different engravings a single cholesteric liquid crystal precursor composition, b) heating the applied composition to bring said composition to a cholesteric liquid crystal state, and c) curing the composition so as to form the region based on a single cured ink comprising a cholesteric liquid crystal polymer.
    • 本发明涉及光学可变安全元件领域,其包括基于包含胆甾型液晶聚合物的单一固化油墨的区域,所述区域具有至少两个,优选至少三个图案,其以至少一个视角 ,不同的CIE(1976)颜色索引参数和/或用于保护安全文件免受假冒和/或非法再现的选择性反射带的不同位置。 特别地,本发明涉及用于制造所述特征的方法,当所述方法包括以下步骤时:a)通过使用具有至少两个,优选至少三个不同雕刻的凹版滚筒通过轮转凹版印刷方法施加在基底上 单一胆甾型液晶前体组合物,b)加热所施加的组合物以使所述组合物成为胆甾型液晶状态,以及c)固化所述组合物以便基于包含胆甾型液晶聚合物的单一固化油墨形成所述区域。