发明名称 |
COLOUR LASER MARKING OF ARTICLES AND SECURITY DOCUMENTS |
摘要 |
A method for preparing a colour laser marked article comprising the steps of: a) infrared laser marking a security element including a polymeric support and a colour forming layer comprising a colour forming compound, an infrared dye and a polymeric binder comprising vinyl acetate and at least 85 wt % of vinyl chloride based on the total weight of the binder; and b) exposing the laser marked security element with light having a wavelength higher than 440 nm. The light exposure of step b) hinders the falsification of an issued security document without significant increase of background density. |
申请公布号 |
US2014099482(A1) |
申请公布日期 |
2014.04.10 |
申请号 |
US201214124312 |
申请日期 |
2012.05.10 |
申请人 |
WAUMANS BART;CALLANT PAUL;AGFA-GEVAERT N.V. |
发明人 |
WAUMANS BART;CALLANT PAUL |
分类号 |
B41M3/14;B42D15/00 |
主分类号 |
B41M3/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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