Photochromic material and an optical storage medium using the sa

Details Photochromic material and an optical storage medium using the sa Photochromic material and an optical storage medium using the sa

1993-04-23

1994-11-01

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

430 19, 430495, 430962, 430945, 252586, G03C 173

Patent

active

053606990

ABSTRACT:
The present invention provides a photochromic material which comprises a spiropyran compound of formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are independently alkyl groups each containing 1 to 30 carbon atoms and Y is a halogen.
The photochromic material possesses absorption sensitivity at wavelengths in the length region of about 700 nm which is the oscillation range of a semi-conductor laser device, and possesses higher stability compared with conventional one when it becomes a colored form.

REFERENCES:
patent: 4780393 (1988-10-01), Frommeld
patent: 4794068 (1988-12-01), Miyazaki et al.
patent: 4845021 (1989-07-01), Miyazaki et al.
Hibino et al., Nippon Kagaku Kaishi, No. 10, pp. 1129-1135 (Oct. 1990).
Zakhs et al., Khim. Getesotsikl. Soedin, No. 10, pp. 1320-1326, 1977.
Hibino et al., Thin Solid Films, 210/211 (1992) pp. 562-564.
Hibino et al., Proc. 5th International Conference on LB Films GP19 (1991).

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