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US 5,614,342 : Methods for preparing cocrystals of titanyl fluorophthalocyanines and unsubstituted titanyl phthalocyanine, electrophotographic elements, and titanyl phthalocyanine compositions

 

Inventors:

Molaire, Michel F. (Rochester, NY)
Kaeding, Jeanne E. (Rochester, NY) 
 

Assignee:

Eastman Kodak Company (Rochester, NY) 
Cocrystallized titanyl phthalocyanine-titanyl fluorophthalocyanine compositions, preparation methods, and electrophotographic elements utilizing the compositions. The method has the steps of: admixing crude titanyl phthalocyanine and crude titanyl fluorophthalocyanine to provide a pigment mixture; 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 organic solvent having a gammac hydrogen bonding parameter of less than 8.0; and prior to the contacting, substantially excluding the amorphous pigment mixture from contact with organic solvent having a gammac hydrogen bonding parameter greater than 9.0.
http://www.freepatentsonline.com/5614342.pdf

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