Optical recording medium

Details Optical recording medium Optical recording medium

1987-08-31

1988-12-27

Louie, Won H.

Radiation imagery chemistry: process, composition, or product th

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

Composition or product

430 19, 430 21, 430962, 430495, 430270, G03C 1733

Patent

active

047940689

ABSTRACT:
An optical recording medium is prepared by the use of spiropyrane whose molecular structure contains an alkyl chain having at least 10 more carbon atoms, and by the use of an LB film method or a spin coating method. This recording medium is of a structure wherein when irradiated with the UV, the spiropyrane is photo-isomerized to photomerocyane and, thereafter, when subsequently heated at 35.degree. to 40.degree. C. for 15 minutes, a J-aggregate of the photomerocyane is formed in very stabilized form. When the recording medium is irradiated with light of wavelength of visible spectrum, the color is bleached with the information consequently recorded. The optical recording medium herein disclosed is rewritable and can retain the recorded information for 5,000 hours or more.

REFERENCES:
patent: 3355293 (1967-11-01), Foris
patent: 4405733 (1983-09-01), Williams et al.
Cabrera et al--"Photocontraction of Liquid Spiropyran-Merocyanine Films," Science, vol. 226, Oct. 19, 1984, pp. 341-343.
Vollmer, Chem Abstr., vol. 84, No. 82505q (1986).
Bartolini et al., Optical Engineering, vol. 15, No. 2 (1976), pp. 99-108.

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