US 7,026,084 : Cocrystals containing high-chlorine titanyl phthalocyanine and low concentration of titanyl fluorophthalocyanine, and electrophotographic element containing same

 

Inventors:
Molaire, Michel F. (Rochester, NY, US)
Kaeding, Jeanne E. (Rochester, NY, US)
Zubil, Theodore (Rochester, NY, US)
Murray, Jeffrey R. (Palmyra, NY, US)
 
Assignee:
Eastman Kodak Company (Rochester, NY, US) 
 

In a process for forming an amorphous TiOPc/TiOFPc pigment mixture containing a low concentration of TiOFPc, a mixture containing phthalonitrile and titanium tetrachloride is subjected to reaction conditions effective to form lightly chlorine-substituted crude crystalline Cl—TiOPc. The lightly chlorine-substituted crude crystalline Cl—TiOPc is combined with crude crystalline TiOFPc in a weight ratio from about 75:25 Cl—TiOPc:TiOFPc to about 99.5:0.5 Cl—TiOPc:TiOFPC to form a crude crystalline pigment mixture, which is treated under conditions effective to form a substantially amorphous pigment mixture of Cl—TiOPc and TiOFPc. The substantially amorphous mixture can subsequently be converted to a nanocrystalline Cl—TiOPc/TiOFPc pigment composition containing a low concentration of TiOFPc.

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