Radiation imagery chemistry: process – composition – or product th – Erasable imaging
Patent
1986-12-19
1988-06-28
Michl, Paul R.
Radiation imagery chemistry: process, composition, or product th
Erasable imaging
430270, 430288, 430495, 430945, 524 87, 524485, 524486, 3461351, G11B 724, G01D 900, G03C 172, G03C 516
Patent
active
047538619
ABSTRACT:
Erasable optical memories for storing information are prepared from organic materials having two stable crystalline forms. Each crystalline form has at least one different optical characteristic and the materials are reversibly thermally convertible between the crystalline forms. Information is recorded or erased with a laser beam that heats a film of the organic material in a local area to change the crystalline form. Information may also be recorded or erased by melting a local area or all of the film and quickly cooling it to restore the original crystalline form. Examples of such organic compounds are biaryl compounds, such as binaphthyls, bianthryls and biquinolyls.
REFERENCES:
Wilson et al, "Thermally Induced Resolution of Racemic 1,1'-Binaphthyl", 97 J. Am. Chem. Soc. (1975), pp. 1474-1478.
Placock et al., "Solid State Resolution of Racemic 1,1'-Binaphthyl", 93 J. Am. Chem. Soc. (1971), pp. 1291-1292.
Chernov et al, "Phonon Contribution to Melting of Thin Films", NMR Study of Diphenyl 38 JETP Letters (1983), pp. 345-349.
Kress et al, "Solid State Resolution of Binaphthyl etc.", 102 J. Am. Chem. Soc. (1080), pp. 7709-7714.
Bader et al, "Two Crystalline Modifications of 1,1'-Binaphtyl", J. Chem. Soc., 1965, pp. 1543-1544.
Blachman Marc W.
Burrington James D.
Tsou Dean T.
Buscher Mark R.
Curatolo J. G.
Esposito M. F.
Evans L. W.
Michl Paul R.
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