記録液およびその製造法

Recording liquid and production thereof

Abstract

PURPOSE: To obtain the recording liquid providing a recorded material emitting red light with ultraviolet rays and having high water-resistance and utilizable for the printing of invisible letter, etc., by filtering an aqueous dispersion containing a specific compound with a filter, etc. CONSTITUTION: This recording liquid having a viscosity of 0.8-15cPs (25 deg.C) is produced by preparing a concentrated dispersion containing (A) 0.1-10wt.% of compounds composed of (i) Y(P, V)O4 :Eu, (ii) Y2 O3 :Eu and (iii) Y2 O3 S:Eu, (B) an aqueous resin and preferably (C) a neutralizing agent of the component B, diluting the concentrated dispersion with water and (D) an additive and filtering with a filter having a pore diameter of <=3μm. Preferably, the component B is acrylic resin, etc., and the liquid is incorporated with the component C such as ammonium.
(57)【要約】 【構成】254〜365nmの紫外線を照射すると、6 00〜650nmの光を発する特定の構造を有する化合 物と水性樹脂とをからなる記録液およびその製造法。 【効果】水を媒体としながらも耐水性の良好な記録物を 得ることができ、該記録物は紫外線により赤色の発光を 生じるので、この発光をセンサーで読み取ることができ る。そこで、該記録液は、センサー読み取り機能を有す る、隠し文字やセキュリィティーに関する印刷物等に利 用することができる。

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