Radiation imagery chemistry: process – composition – or product th – Product having sound record or process of making
Patent
1979-11-14
1981-11-24
Silverman, Stanley S.
Radiation imagery chemistry: process, composition, or product th
Product having sound record or process of making
235493, 360 2, 428328, 428329, 428694, 428900, 428918, 430523, 430524, G03C 724, G11B 570
Patent
active
043025234
ABSTRACT:
Magnetic recording elements containing substantially transparent magnetic recording layers which exhibit excellent magnetic recording and reproducing characteristics. Such elements contain a support and a transparent magnetic recording layer. The recording layer has a thickness up to about 5 microns and contains acicular, magnetizable particles having an average width of less than about 0.06 micron and an average length up to about 1 micron. These particles are substantially homogeneously dispersed in a medium that comprises a binder and has a refractive index which is substantially the same throughout the thickness of the magnetic recording layer. The concentration of the binder is at least about 10 parts per 100 parts, by weight, of the particles and is up to about 30 parts, by weight, for particles having an average length of at least about 0.06 micron and up to about 40 parts, per 100 parts, by weight, for particles having an average length of less than about 0.06 micron. Such magnetic recording layers have a total transmission of at least 20 percent for visible light having a wavelength of 632.8 nm and a ratio of direct transmission to total transmission at this wavelength of at least 50 percent.
The process for preparing such elements, which are particularly useful for motion picture films, is also disclosed.
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patent: 4199614 (1980-04-01), Ziolo
Lewin, "The Infrared Transparency of Magnetic Tracks", Journal of the Society of Motion Picture and Television Engineers, vol. 66, No. 9, Sep. 1957.
Audran Roger G. L.
Huguenard Albert P.
Eastman Kodak Company
Silverman Stanley S.
Wiese B. D.
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