Pigments
AssigneeMerck & Co., Inc.
InventorsRalf Anselmann, Thomas Albrecht, Sara Rodriguez-Mozaz
Life of this patent
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Abstract
The invention relates to particles with an opalescent effect, which have a particle size in the range from 5 μm to 5000 μm, comprising monodisperse spheres having a diameter of 50 nm to 2 μm with a standard deviation of less than 5% in a packed and regularly ordered structure which is three-dimensional -in terms of domains and is mechanically stabilized by physical or chemical modification.
Claims13
Particles with an opalescent effect, which have a particle size in the range from 5 μm to 5000 μm, comprising monodisperse spheres having a diameter of 50 nm to 2 μm with a standard deviation of less than 5% in a closely packed and regularly ordered structure which is three-dimensional in terms of domains and is mechanically stabilized by physical or chemical modification.
Process for preparing particles, by
- a) suspending monodisperse spheres having a diameter of 50 nm to 2 μm with a standard deviation of less than 5% in a liquid medium,
- b) applying the suspension to a surface, and
- c) removing the liquid medium.
Dependencies are inferred from the claim text.