WATER-RESISTANT FLUORESCENT PIGMENT AND FLUORESCENT INK BASED THEREON

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FIELD : chemistry. SUBSTANCE : water-resistant fluorescent pigment is an oxide matrix based on aluminium oxide and, at least, one of the following elements : Mg, Са, Sr, Ва, Zn, Mn, Si, В, Р, Ga, activated with, at least, single rare earth element, treated with a mixture of salts from the following group : Na3PO4, Na2HPO4, (NH4)2HPO4, Ca3(PO4)2, with acids from the following group : HCl, H2SO4, HNO3, pH not exceeding 4 at the end of treatment. Oxide matrix may be of formula MO-SiO2Al2O3 : R, where М stands for, at least, a single metal from the following group : Ca, Sr, Ba, Mg, Zn; R stands for, at least, a single element from the following group : Dy, Nd, Eu, Tm, Tb, Y, Yb; MAl2O4 : R, where М stands for, at least, a single metal from the following : Ca, Sr, Mg, Ba, while R stands for, at least, a single element from the following : Dy, Nd, Eu, Tm, Tb, Y, Yb; MAlO4 : R, where М stands for, at least, a single metal from the following : Sr, Ca, Ba; R stands for, at least, a single element from the following group : Dy, Nd, Eu, Tm, Tb, Y, Yb. Ink contains the said fluorescent pigment and thickening agent. EFFECT : water-resistant at room or elevated temperature, fluorescent properties being retained. 5 cl, 5 tbl, 57 ex