Interference pigments on the basis of silicon oxides

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/00 (2006.01) C09D 5/36 (2006.01)

Patent

CA 2500804

The present invention relates to pigments, the particles of which generally have a length of from 2 ~m to 5 mm, a width of from 2 ~m to 2 mm, and a thickness of from 20 nm to 2 ~m, and a ratio of length to thickness of at least 2 : 1, wherein the particles contain a core of SiOy with 0.70 <= y <= 1.8, especially 1.40 <= y <= 1.8, having two substantially parallel faces, the distance between which is the shortest axis of the core, comprising (a) a material, especially a metal oxide, having a high index of refraction; or (a) a thin semi-transparent metal layer; a process for their production and their use in paints, ink-jet printing, for dyeing textiles, for pigmenting coatings (paints), printing inks, plastics, cosmetics, glazes for ceramics and glass.

La présente invention se rapporte à des pigments, dont les particules présentent normalement une longueur allant de 2 ?m à 5 mm, une largeur allant de 2 ?m à 2 mm, et une épaisseur allant de 20 nm à 2 ?m, ainsi qu'un rapport de longueur et épaisseur d'au moins 2: 1, les particules contenant un noyau de SiO¿y? selon les proportions 0.70 = y = 1.8, plus précisément 1.40 = y = 1.8. Des particules présentent deux faces sensiblement parallèles et sont séparées en termes de distance par l'axe le plus court du noyau. Les pigments comprennent (a) une matière, notamment un oxyde de métal, ayant un fort indice de réfraction ; ou (a) une fine couche semi transparente. L'invention concerne également un procédé d'obtention desdits pigments et leur utilisation dans des peintures, dans la pression à jet d'encre, pour la teinture de textiles, la pigmentation de revêtements (peintures), avec des encres d'impression, des plastiques, des cosmétiques, des glaçures dans le domaine des céramiques et du verre.

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