Photochromic composition

Details Photochromic composition Photochromic composition

1999-06-11

2000-10-31

Sugarman, Scott J.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359245, 359246, G02F 103

Patent

active

061411353

ABSTRACT:
A photochromic composition which develops a neutral tint such as grey, green, brown or amber upon the irradiation with light including ultraviolet rays such as sunlight starting from the initial colorless state, maintaining a homogeneous color tone in the transient stage of developing color. The photochromic composition comprises 100 parts by weight of a fulgimide compound and/or a fulgide compound, and from 10 to 300 parts by weight of a chromene compound having a molar extinction coefficient of not smaller than 150 L/mol-cm for light of a wavelength of 400 nm.

REFERENCES:
patent: 4994208 (1991-02-01), Mcbain
patent: 5981634 (1999-11-01), Smith
Patent Abstracts of Japan, vol., 015, No. 317, Aug. 13, 1991 & JP 03 121188A (Tokuyama Soda Co., Ltd.) May 23, 1991 (Abstract).

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