Process for preparing water resistant luminous pigments

Details Process for preparing water resistant luminous pigments Process for preparing water resistant luminous pigments

C - Chemistry, Metallurgy

09

C

C09C 1/62 (2006.01) C09K 11/77 (2006.01)

Patent

CA 2290340

A process for preparing a water resistant luminous pigment with durability, characterized in that a luminous pigment, in which an oxide matrix comprising at least one element selected from the group consisting of Mg, Ca, Sr, Ba and Zn and at least one element selected from the group consisting of B, A1, P and Ga is doped with at least one rare-earth metal element, is subjected to an acid treatment under the condition of pH of not more than 3 using at least one acidic compound selected from the group consisting of acids and acid generating compounds, and is subsequently subjected to an alkaline treatment under the condition of pH 4-9 using at least one alkaline compound selected from the group consisting of alkalis and alkali generating compounds. 32

L'invention concerne un procédé de production d'un pigment lumineux présentant une résistance à l'eau durable. Le procédé se caractérise en ce qu'un pigment lumineux, obtenu par dopage d'un matériau d'oxyde de base contenant au moins un élément sélectionné dans le groupe constitué par Mg, Ca, Sr, Ba et Zn et au moins un élément sélectionné dans le groupe constitué par B, Al, P et Ga avec au moins un élément de terre rare, est soumis à un traitement acide, à un pH d'au plus 3, mettant en oeuvre au moins un composé acide sélectionné parmi des acides et des composés générant de l'acide, puis à traitement aux alcalis, à un pH de 4 à 9, mettant en oeuvre au moins un composé alcalin sélectionné parmi des alcalis et des composés générant des alcalis.

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