Gas separation: apparatus – Electric field separation apparatus – Electrode cleaner – apparatus part flusher – discharger – or...
Patent
1978-01-03
1979-10-23
Louie, Jr., Won H.
Gas separation: apparatus
Electric field separation apparatus
Electrode cleaner, apparatus part flusher, discharger, or...
428913, 428327, 106 21, 96 90PC, G03C 524, C09D 1100
Patent
active
041719808
ABSTRACT:
A photochromic spiropyran compound is uniformly dispersed in a vinyl chloride homopolymer or copolymer resin binder. The resulting photosensitive composition provides an image which is highly stable against exposure to light, darkness, and heat when the composition is exposed to a light source emitting radiation of wavelength which includes the absorption band of the spiropyran compound.
By incorporating polyvinylidene chloride in the photosensitive composition a positive reproduction of an original can be obtained by a dry photographic process in which the photosensitive composition is first irradiated through an original to form a stable pale yellow complex between hydrochloric acid produced by decomposition of the polyvinylidene chloride and the merocyanine produced from the photoisomerization of the spiropyran compound and thereafter again irradiating the entire photosensitive composition to form a stable colored complex in the areas which were not originally exposed which correspond to the opaque area of the original.
A photothermal development process is accomplished with a composition which includes the photochromic spiropyran compound, the polyvinyl chloride binder and at least one additional material selected from hydrolyzed polyvinyl alcohol, hydroxyethyl cellulose, or carboxymethyl cellulose.
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patent: 3441411 (1969-04-01), Amidon et al.
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patent: 3486899 (1969-12-01), Brown
patent: 3667949 (1972-06-01), Inoue et al.
patent: 3700440 (1972-10-01), McLeod et al.
patent: 3761942 (1973-09-01), Lorenz et al.
patent: 3785820 (1974-01-01), Inoue et al.
La Cellophane
Louie, Jr. Won H.
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