Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Patent
1990-02-23
1991-10-08
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
241 27, G03G 506
Patent
active
050553682
ABSTRACT:
An electrophotographic recording element having a layer formed from a liquid composition comprising polymeric binder and dispersed photoconductive titanyl phthalocyanine particles. The titanyl phthalocyanine particles have a particle size up to about 0.2 micrometer and are characterized by certain X-ray diffraction characteristics and the layers are characterized by certain spectral absorption ranges. The coating composition comprises finely-divided photoconductive titanyl phthalocyanine particles dispersed in a solvent solution of polymeric binder and is prepared by the steps of (1) milling a titanyl phthalocyanine pigment with milling media comprising inorganic salt and non-conducting particles under shear conditions in the substantial absence of the solvent to provide pigment having a particle size up to 0.2 micrometer, (2) continuing the milling at higher shear at a temperature up to about 50.degree. C. to achieve a perceptible color change of the pigment particles, (3) rapidly increasing the temperature of the milled pigment by at least 10.degree. C., (4) separating the milled pigment from the milling media and (5) mixing the milled pigment with the solvent solution of polymeric binder to form the coating composition.
REFERENCES:
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patent: 4701396 (1987-10-01), Hung et al.
patent: 4728592 (1988-03-01), Ohaku et al.
patent: 4785999 (1988-11-01), Takijiri
Klose Thomas R.
Nguyen Khe C.
Eastman Kodak Company
Goodrow John
Janci David F.
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