Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Reexamination Certificate
2007-05-01
2007-05-01
Goodrow, John L (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
C430S059400, C430S135000
Reexamination Certificate
active
10836784
ABSTRACT:
A method for preparing a coating solution containing a cocrystallized titanyl phthalocyanine-titanyl fluorophthalocyanine, the method comprising: dry milling a charge-generation pigment or mixtures of charge-generation pigments; increasing the amorphousness of the pigment mixture as determined by X-ray crystallography using X-radiation characteristic of Cu Kα at a wavelength of 1.541 Å of the Bragg angle 2θ to provide an amorphous pigment mixture; contacting the amorphous pigment mixture with a first organic solvent having a gammachydrogen bonding parameter of less than 9, with or without the presence of a dispersant material, to produce a crystalline pigment of the charge-generation pigment prior to contacting the pigment with a second organic solvent having a gammachydrogen bonding parameter greater than 9; mixing at least one of a second organic solvent, a dispersant and a binder with the crystalline pigment/first solvent mixture without isolating the crystalline pigment to produce a mixture; and, adjusting the concentrations of the first organic solvent, crystalline pigment, binder, dispersants and second organic solvent as required to produce the coating solution of a selected composition.
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Lobo Lloyd Anthony
Molaire Michel Frantz
Eastman Kodak Company
Goodrow John L
Ruoff Carl F.
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