Sun Chemical Corporation

David J Kozak

Russell J Schwartz

Paul Andrew Merchak

Lisa Clapp

Aaron M Hollman

Mark Ortalano

Deborah Charlson

Paul Merchak

The present invention provides a reversible piezochromic system that changes appearance upon application of a mechanical force. The reversible piezochromic system includes a cavity defined by a first substrate and a second substrate. The cavity includes at least a first fluid. The first fluid spreads when a mechanical force is applied to the system. The relaxation time of the first fluid depends upon the internal forces of the system. These internal forces at least include the surface energy differences between the substrates and the fluid or fluids, and the rheological properties of the fluid or fluids.

Reversible piezochromic system, methods of making a reversible piezochromic system, and methods of using a reversible piezochromic system

The current invention relates to a piezochromic device wherein said device exhibits a reversible change in appearance initialed by an external applied force and then reverts back to its original appearance over a set relaxation time when the external force is removed. In one embodiment, a device comprising a transparent or semi-transparent cover layer and a magnetic layer, wherein between the cover layer and the magnetic layer is a liquid medium containing magnetically alignable pigments.

Piezochromic device

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Fairfield, OH, United States of America

David J Kozak