Em Industries, Inc.

Emd Chemicals, Inc.

Diane Lewis

Guoyi Fu

A moving bed filtration process for the production of sphere based crystals is disclosed. Sphere based crystals having an opal-like structure or an inverse opal-like structure can be produced in accordance with the invention.

Method for producing sphere-based crystals

The invention relates to particles with opalescent effect&mdash;especially 3-D structural color pigments-based on solid colloidal crystals of monodispersed spheres and the manufacturing processes suitable for large-scale production of such solid colloidal crystal products. The particles with opalescent effect contain a sphere based crystal structure (or super-lattice) built up by monodisperse spheres and one or more secondary types of much smaller colloidal particles occupying partially or completely the empty spaces between the monodisperse spheres.

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Savannah, GA, United States of America

Diane Lewis