Stabilized electrochromic media
First Claim
1. A composition which is suitable as a medium in an electrochromic device, which composition comprisesa) one or more solvents suitable as a medium in an electrochromic device selected from the group consisting of ketones, cyclic esters, cyclic carbonates and glycidyl ether carbonates, and one or more materials which are a functional element of an electrochromic device,b) an effective amount of one or more ultraviolet light absorbers selected from the group consisting of hydroxyphenylbenzotriazoles and tris-aryl-s-triazines, andc) an effective amount of one or more N—
- H or N-alkyl hindered amine light stabilizers of formula A′
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed are compositions, which are stabilized against degradation and yellowing during exposure to ultraviolet light by the presence of certain hindered amine 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
15 Claims
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1. A composition which is suitable as a medium in an electrochromic device, which composition comprises
a) one or more solvents suitable as a medium in an electrochromic device selected from the group consisting of ketones, cyclic esters, cyclic carbonates and glycidyl ether carbonates, and one or more materials which are a functional element of an electrochromic device, b) an effective amount of one or more ultraviolet light absorbers selected from the group consisting of hydroxyphenylbenzotriazoles and tris-aryl-s-triazines, and c) an effective amount of one or more N— - H or N-alkyl hindered amine light stabilizers of formula A′
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- H or N-alkyl hindered amine light stabilizers of formula A′
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15. A method of preparing a stablized medium useful in electrochromic devices, which method comprises adding to a composition comprising:
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i) one or more solvents suitable as a medium in an electroactive device selected from the group consisting of ketones cyclic esters, cyclic carbonates and glycidyl ether carbonates and one or more more materials which are a functional element of an electrochromic device, and ii) an effective amount of one or ultraviolet light absorbers selected from the group consisting of hydroxyphenylbenzotriazoles, and tris-aryl-s-triazines an effective amount of one or more N—
H and N-alkyl hindered amine light stabilizers of formula A′
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Specification