Sun Chemical Corporation

Stephanie Chevalliot

Jason C Heikenfeld

Russell J Schwartz

Lisa Clapp

Stanislav G Vilner

April Milarcik

Manjeet Dhindsa

Colored conductive fluids for electrowetting or electrofluidic devices, and the devices themselves, are disclosed. The colored conductive fluid includes a polar solvent and a colorant selected from a pigment and/or a dye. The polar solvent has (a) a dynamic viscosity of 0.1 cP to 1000 cP at 25&#xb0; C., (b) a surface tension of 25 dynes/cm to 90 dynes/cm at 25&#xb0; C., and (c) an electrowetting relative response of 20% to 80%. The colored conductive fluid itself can have an electrical conductivity from 0.1 &#x3bc;S/cm to 3,000 &#x3bc;S/cm and can have no greater than 500 total ppm of monatomic ions with ionic radii smaller than 2.0 &#x212b; and polyatomic ions with ionic radii smaller than 1.45 &#x212b;. The colored conductive fluid should not cause electrical breakdown of a dielectric in the device in which it is employed. An agent for controlling electrical conductivity can optionally be added to the colored conductive fluid.

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Cincinnati, OH, United States of America

Stephanie Chevalliot