Photochromic material

Details Photochromic material Photochromic material

1993-11-15

1995-06-20

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Dye image from radiation sensitive dye or dye former by dry...

Composition or product

430945, 430962, 252586, 548409, G03C 1685

Patent

active

054260183

ABSTRACT:
The present invention provides a novel photochromic material which is capable of forming two kinds of aggregates, each having a sharp absorption peak at a different wavelength. The photochromic material comprises a spiropyran compound represented by the following general formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently alkyl groups each containing 1 to 30 carbon atoms, and R.sup.3, R.sup.4, R.sup.5, and R.sup.6 are independently selected from the group consisting of hydrogen, an amino group, an alkoxy group with 1 to 5 carbon atoms, and an alkylamino group with 1 to 5 carbon atoms with the proviso that at least one of R.sup.3, R.sup.4, R.sup.5, and R.sup.6 is an amino group, an alkoxy group or an alkylamino group.

REFERENCES:
patent: 4737427 (1988-04-01), Miyazaki et al.
patent: 4753867 (1988-06-01), Arakawa et al.
patent: 4794068 (1988-12-01), Miyazaki et al.
"Aggregation Control of Photochromic Spiropyrans in Langmuir-Blodgett Films", Proc. 5th Int. Con. on LB Films, Hibino et al, GP 19 (1991).
Hibino et al., Nippon Kagaku Kaishi, No. 10, pp. 1129-1135, Oct. 1990.
Ando et al., "J. Aggregation of Photochrmic Spiropyrans in Langmuir-Blodgett Films", Thin Solid Films, 133, pp. 21-28 (1985).
Seki et al., J. Phys. Chem., 94, pp. 3769-3775, (1990).
Chemical Abstracts, vol. 114, No. 6, Abstract No. 52789F, (Feb. 1991).

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