Patent ID: 7365896
Filing Date: 2008-04-29
Classification: B60R,C09K

Abstract:
1. A photochromic device comprising: a photochromic layer comprising a photochromic material which exhibits absorbance in a visible region upon being sensitized by a light having a wavelength of not less than 700 nm; and an ultraviolet light blocking device configured to block an ultraviolet light from sensitizing the photochromic material in the photochromic layer, wherein the ultraviolet light blocking device comprises at least one of an ultraviolet shielding layer positioned to shield the photochromic layer from the ultraviolet light and an ultraviolet light absorber included in the photochromic layer, and the photochromic material comprises a compound selected from the group consisting of a 4,4′-bipyridine derivative represented by the formula (1), a 4,4′-bipyridine derivative represented by the formula (2), and a 4,4′-bipyridine derivative represented by the formula (3): where R 1 , R 2 , R 3 , and R 4 in the formula (2) are a condensed aromatic hydrocarbon or a derivative thereof and are the same or different from each other; where R 11 and R 12 in the formula (3) are an alkyl group having 1 to 10 carbon atoms or a derivative thereof, and are the same or different from each other, and X − is selected from the group consisting of Cl − , BF 4 − , PF 6 − , AsF 6 − , ClO 4 − , and NO 3 − .