NOVEL IR DYES AND LASER MARKABLE ARTICLES COMPRISING SUCH IR DYES
申请人:AGFA-GEVAERT
公开号:US20170043602A1
公开(公告)日:2017-02-16
Infrared dyes having an infrared absorption maximum above 1130 nm with minor colouration in the visual spectrum. The infrared dyes are especially useful for producing multicolour laser marked security documents having reduced background coloration and enhanced colour gamut.
LASER MARKABLE COMPOSITIONS, ARTICLES AND DOCUMENTS
申请人:AGFA-GEVAERT
公开号:US20180154667A1
公开(公告)日:2018-06-07
A laser markable composition includes (a) an aqueous medium; (b) capsules composed of a polymeric shell surrounding a core; (c) a colour developing agent or colour developing agent precursor; and (d) an optothermal converting agent; characterized in that the core of the capsule contains a leuco dye.