Radiation imagery chemistry: process – composition – or product th – Imaged product – Multilayer
Patent
1994-10-06
1996-03-19
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Imaged product
Multilayer
430 17, 430944, 430945, 43027014, 4302702, G11B 724
Patent
active
055003141
ABSTRACT:
A process for the optical recording and storage of information in the form of bits by irradiating a recording material comprising a substrate coated with at least one layer of a pigment selected from the group of the dithiopyrrolopyrroles, dithioquinacridones, phthalocyanines or mixtures of several of these pigments as recording layer dotwise or linearly with laser light in the near infrared range (NIR range), which pigment (a) has a crystal modification having an absorption band in the NIR range, and (b) is in contact with a solid organic compound that changes the crystal modification of the pigment upon irradiation with laser light, so that (c) after irradiation the absorption in the NIR range is reduced, while the organic compound exhibits no absorption in the NIR range before and after irradiation.
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Emmelius et al. Agewandte Chemie vol. 11 pp. 1475-1502 (1989).
Mizuguchi et al. J. Imaging Sci. vol. 32 No. 3 pp. 135-140 (May 1988).
Giller Gerald
Mizuguchi Jin
Bowers Jr. Charles L.
Ciba-Geigy Corporation
Kovaleski Michele A.
McPherson John A.
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