Stabilized electrochromic media
First Claim
1. An electroactive device which device comprises a medium in the electroactive device, which medium composition comprisesi) one or more solvents suitable as a medium in the electroactive device,ii) an effective amount of one or more additive compounds selected from the group consisting of ultraviolet light absorbers, andiii) an effective amount of one or more additive compounds selected from the group consisting of nitroxyls, hydroxyl amines and hydroxyl amine salts,wherein at least one of the one or more nitroxyls, hydroxyl amines and hydroxyl amine salts of component (iii) is a compound of formula I, II or III
1 Assignment
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Accused Products
Abstract
Disclosed are compositions, which are stabilized against degradation and yellowing during exposure to ultraviolet light by the presence of certain nitroxyl, hydroxyl amine and hydroxyl amine salt additives, a method of stabilizing the compositions by the addition of said additives, to the use of such compositions as media in electroactive devices such as electrochromic and electrophoteric devices, and the electroactive devices comprised of these media.
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Citations
20 Claims
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1. An electroactive device which device comprises a medium in the electroactive device, which medium composition comprises
i) one or more solvents suitable as a medium in the electroactive device, ii) an effective amount of one or more additive compounds selected from the group consisting of ultraviolet light absorbers, and iii) an effective amount of one or more additive compounds selected from the group consisting of nitroxyls, hydroxyl amines and hydroxyl amine salts, wherein at least one of the one or more nitroxyls, hydroxyl amines and hydroxyl amine salts of component (iii) is a compound of formula I, II or III
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20. A method of preparing a stabilized medium useful in electroactive devices, which method comprises adding an effective amount of one or more additive compounds selected from the group consisting of nitroxyls, hydroxyl amines and hydroxyl amine salts wherein at least one of the one or more nitroxyls, hydroxyl amines and hydroxyl amine salts is a compound of formula I, II or III
Specification