Photochromic material, photochromic thin film, clay thin film, a

Details Photochromic material, photochromic thin film, clay thin film, a Photochromic material, photochromic thin film, clay thin film, a

1995-06-06

1996-11-19

Lusignan, Michael

Coating processes

Optical element produced

427384, 430 17, 430345, 430962, 43027011, B05D 506

Patent

active

055760554

ABSTRACT:
In a first form, photochromic material has anionic photochromic molecules and anionic polar molecules adsorbed between layers of anion-adsorptive inorganic layer-structured crystals. In a second form, photochromic material has neutral photochromic molecules and non-polar molecules adsorbed between layers of anion-adsorptive inorganic layer-structured crystals. The photochromic molecules are of anionic or neutral spiro-pyran compounds and the inorganic crystals are of hydrotalcite compounds. These photochromic materials in which anionic or neutral photochromic molecules remain thermally stable find application as optical recording material. In a third form, a photochromic thin film is available comprising a pyrolytically decomposed thin film of anion-adsorptive inorganic layer-structured crystals having anionic photochromic molecules and non-polar molecules adsorbed thereto. In a fourth form, a clay thin film is prepared by forming a thin film from an aqueous dispersion containing 0.1-5% by weight of a hydrotalcite group intercalation compound, drying the film, optionally heat treating the film for excluding a guest if any, and causing functional molecules such as photochromic molecules to be adsorbed between layers of the film.

REFERENCES:
patent: 4774212 (1988-09-01), Drezdon
patent: 4913544 (1990-04-01), Rickwood et al.
patent: 5250279 (1993-10-01), Preston et al.
patent: 5252437 (1993-10-01), Suzuki et al.

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