Gas absorption additives for electrophoretic suspensions

G - Physics – 02 – F

Patent

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G02F 1/167 (2006.01)

Patent

CA 2167919

An electrophoretic suspension prepared in ac- cordance with the present invention includes a dielec- tric fluid having suspended therein a pluraliy of pig- ment particles movable between the electrodes (24, 26) of an EPID device (10) in response to an elec- tric potential applied thereto and an effective amount of at least one additive for chemically absorbing at least one gas in the fluid. To absorb hydrogen gas in the dielectric fluid, a hydrogen absorbing additive is dispersed therein. The molecule of the hydrogen ab- sorbing additive has an aromatic C/H ratio of 1/0.8 or less, and preferably between 1/0.67 and 1/0.75. To ab- sorb chlorine gas in the dielectric fluid, and effective amount of a chlorine gas absorbing compound is also preferably added thereto. The chlorine gas absorbing additive has a molecule having at least one double bond and may be sterically strained alkene such as 5- ethylidene-2-norbornene.

On décrit une suspension électrophorétique préparée selon la présente invention, comprenant un fluide diélectrique contenant un ensemble de particules de pigment en suspension. Ces particules sont mobiles entre les électrodes (24, 26) d'un dispositif à écran d'image électrophorétique (10), lors de l'application d'un potentiel électrique et d'une quantité efficace d'au moins un additif destiné à absorber chimiquement au moins un gaz du fluide. Afin d'absorber l'hydrogène dans le fluide diélectrique, un additif absorbant l'hydrogène y est dispersé. La molécule de l'additif absorbant l'hydrogène présente un rapport aromatique C/H de 1/0,8 ou moins, de préférence situé etnre 1/0,67 et 1/0,75. Afin d'absorber le chlore du fluide diélectrique, une quantité efficace d'un composé absorbant le chlore gazeux est de préférence également ajoutée. L'additif absorbant le chlore gazeux comprend une molécule possédant au moins une double liaison et peut être un alcène à déformation stérique tel que le 5-éthylidène-2-norbornène.

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