Gloss pigments having high colour saturation

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/36 (2006.01) A61K 8/20 (2006.01) A61K 8/25 (2006.01) A61K 8/26 (2006.01) A61K 8/29 (2006.01) A61Q 1/06 (2006.01) C09C 1/00 (2006.01) C09D 7/12 (2006.01) C09D 11/02 (2006.01)

Patent

CA 2468822

The invention relates to coloured gloss pigments having specific particle dimensions comprising a transparent core of a silicon oxide of the composition SiO0.03 to SiO0.95 and, optionally, further coatings of silicon dioxide, carbon, a partially transparent metal and/or a dielectric of high refractive index, to a coating method suitable therefor wherein metallic silicon is vapour-deposited in the presence of a low oxygen partial pressure, to the use of such gloss pigments in pigmenting plastics, surface coatings, printing inks and cosmetic compositions, and also to pigmented compositions comprising such gloss pigments.

Des pigments brillants colorés présentant des dimensions particulaires spécifiques comprennent un noyau transparent d'oxyde de silicium représenté par la composition SiO¿0,03? à SiO¿0,95?, et, éventuellement, d'autres revêtements de dioxyde de silicium, de carbone, un métal partiellement transparent et/ou un diélectrique à indice de réfraction élevé. L'invention concerne par ailleurs un procédé de revêtement approprié dans lequel du silicium métallique est déposé par évaporation sous vide en présence d'une pression partielle à faible teneur en oxygène. De plus, l'invention concerne l'utilisation de ces pigments brillants dans la coloration du plastique, les enduits, les encres d'impression et les compositions cosmétiques, ainsi que les compositions pigmentées contenant ces pigments brillants.

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