SPD FILMS FORMED WITH CONDUCTIVE POLYMER-COATED SUBSTRATES
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United States of America Patent
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Issued Date -
Sep 20, 2012
app pub date -
May 4, 2012
filing date -
May 4, 2012
priority date (Note) -
Abandoned
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Abstract
A suspended particle device (SPD) film or laminate thereof. The film includes substrates coated on their inner surface with a polythiophene-based conductive polymer serving as electrode means. The polymer may be applied in the form of an aqueous composition also comprising solvent(s) and binder(s). A preferred polymer is a polyethylene dioxythiophene (PEDT) polymer. The polymer may be doped with polystyrene sulfonate. The polymer may be connected to a conductive material that extends beyond an outer boundary of the film to connect with a voltage source. Adhesive strength between the cured emulsion and the polymer is at least 1.46 N/25 mm. A further aspect constitutes a method for increasing adhesion between a cured suspended particle device emulsion and electrode means in a light valve film. The method comprises applying the polymer on an inner surface of the substrates constituting the film to serve as the electrode means.
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