UV-stabilized compositions and methods
First Claim
1. A solution which comprises (a) a non-aqueous solvent, which is suitable for a medium of variable transmittance in a solution-phase electrochromic device, and (b) a compound of Formula I ##STR2## wherein R1 is alkyl of 1 to 20 carbon atoms.
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Abstract
The present invention concerns compositions, which comprise a solvent, which is suitable for a medium of variable transmittance in a solution-phase electrochromic device, and a UV-stabilizer, which is an ester of 2-cyano-3,3-diphenyl acrylic acid. Among embodiments of the invention are solutions used as media of variable transmittance in electrochromic devices, especially single-compartment, self-erasing, solution-phase electrochromic devices. The UV-stabilizer provides to the compositions of the invention stability against degradation from exposure to ultraviolet radiation, including that from the sun. Among applications of electrochromic devices comprising solutions according to the invention are use as variable transmittance components in variable reflectance, outside, rearview mirrors for automobiles.
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29 Claims
- 1. A solution which comprises (a) a non-aqueous solvent, which is suitable for a medium of variable transmittance in a solution-phase electrochromic device, and (b) a compound of Formula I ##STR2## wherein R1 is alkyl of 1 to 20 carbon atoms.
- 25. In a single-compartment, self-erasing, solution-phase electrochromic device, which comprises as the medium of reversibly variable transmittance to light a solution which comprises a non-aqueous solvent, at least one cathodic compound, at least one anodic compound, and, if all of the cathodic and anodic compounds in their zero-potential equilibrium states in the solution are not ionic, an inert, current-carrying electrolyte, the improvement which comprises the presence in said solution of a compound of Formula I ##STR3## wherein R1 is alkyl of 1 to 20 carbon atoms.
Specification