C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 5/36 (2006.01) B41M 3/14 (2006.01) C09C 1/00 (2006.01)
Patent
CA 2425555
The invention relates to a multilayered interference pigment consisting of a transparent carrier material which is coated with alternating layers of colourless, non-absorbent metal oxides having a high and a low refractive index, the difference between the refractive indices being at least 0.1. The inventive pigment can be obtained by alternately coating the transparent carrier material with a metal oxide having a high refractive index and a metal oxide having a low refractive index according to the wet method, by hydrolysing the corresponding water-soluble, inorganic metal compounds, and separating, drying and optionally calcinating the obtained pigment.
L'invention concerne un pigment interférentiel multicouche, constitué d'un matériau support transparent, revêtu de couches alternées d'oxydes métalliques incolores non absorbants ayant un indice de réfraction élevé et faible, la différence entre les indices de réfraction valant au moins 0,1. Le pigment selon l'invention est obtenu par enduction alternée du matériau support transparent avec un oxyde métallique à indice de réfraction élevé et avec un oxyde métallique à indice de réfraction faible selon le procédé par voie humide, par hydrolyse des composés métalliques inorganiques hydrosolubles correspondants, séparation, séchage et éventuellement calcination du pigment obtenu.
Bruckner Hans-Dieter
Kuntz Matthias
Fetherstonhaugh & Co.
Merck Patent Gesellschaft Mit Beschraenkter Haftung
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