UV-stabilized compositions and methods

Details UV-stabilized compositions and methods UV-stabilized compositions and methods

1992-09-02

1994-01-18

Hajec, Donald

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359839, 252600, G02F 101

Patent

active

052803805

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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Cipriani and Hosler, "Ultraviolet Absorbers," Modern Plastics Encyclopedia, vol. 45, No. 1A, Sep., 1967, pp. 406-409.

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