Photochromic compound, photochromic composition and photochromic display element using the same

• US 20040210058A1
• Filed: 03/18/2004
• Published: 10/21/2004
• Est. Priority Date: 04/18/2003
• Status: Abandoned Application

• Current Assignee: Murakami Corporation, Tetsuo Kuwabara
• Original Assignee: Murakami Corporation, Yamanashi Tlo Co., Ltd.
• Inventors: Mochizuka, Takuo, Kuwabara, Tetsuo
• Application Number:
  US10/802,770
• Publication Number:
  US 20040210058A1
• Time in Patent Office: Days
• US Class Current: 546/257
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: C09K 9/02 Organic tenebrescent materials

Abstract

A photochromic display element comprising a photochromic layer 12 containing a 4,4′-bipyridine derivative as a photochromic compound intervined between a transparent substrate 11 placed at a front surface side and a substrate 13 placed at a rear surface side. When a light containing an infrared light having a wavelength of 830 nm is irradiated, the photochromic display element exhibits the absorbance spectrum within a visible light region is reversibly changed whereby the photochromic layer 12 is colored and bleached.

Claims

1. A photochromic compound which sensitizes a wavelength region of not less than 700 nm or a specific infrared region to thereby exhibit absorbency at a visible region.

2. The photochromic compound according to claim 1, which comprises a 4,4′

-bipyridine derivative represented by the following formula (1);

3. The photochromic compound according to claim 1, which comprises a 4,4′

-bipyridine derivative represented by the following formula (2);

4. The photochromic compound according to claim 1, which comprises a 4,4′

-bipyridine derivative represented by the following formula (3);

5. A photochromic composition comprising a solution having the photochromic compound according to claim 1 dissolved in one solvent or a mixed solvent selected from among dimethylformamide (DMF), dimethylacetamide, propylene carbonate, acetonitrile, gamma-butyllactone, and butanol.

6. A photochromic film comprising a film having the photochromic compound according to claim 1 dispersed therein.

7. A photochromic composition at least comprising the photochromic compound according to claim 1 and a ultraviolet absorber, which absorbs a ultraviolet light.

8. A functional element, comprising

a photochromic which sensitizes a wavelength of not less than 700 nm or a specific wavelength within an infrared region, and which exhibits absorbance within a visible region, and

a light source which has an energy strength at a wavelength region of not less than 700 nm or a specific wavelength within an infrared region enough for being sensitized by the photochromic compound,

wherein a photochromic phenomenon, which sensitizes a wavelength of not less than 700 nm or a specific wavelength within an infrared region, and which exhibits absorbance within a visible region, is utilized.

9. The functional element according to claim 8, which possesses a ultraviolet shielding member, which shield an incident ultraviolet light entering in the functional element.

10. The functional element according to claim 8, wherein said photochromic layer containing the photochromic compound at least comprises a ultraviolet absorber, which absorber a ultraviolet light.

11. The functional element according to claim 8, which is a photochromic display element.

12. The functional element according to claim 8, which is an anti-glare mirror.