Patent ID: 7033716

Claim:
A process for forming an amorphous mixture consisting essentially of TiOFPc and TiOPc consisting essentially of more than 75 weight percent TiOPc, said process comprising: forming a mixture of crude crystalline TiOFPc and crude crystalline, substantially chlorine-free TiOPc, said mixture containing less than 75 weight percent of substantially chlorine-free TiOPc; treating said mixture under conditions effective to form a substantially amorphous mixture of TiOFPc and TiOPc containing less than 75 weight percent of substantially chlorine-free TiOPc; treating said substantially amorphous mixture of TiOFPc and TiOPc containing more than 75 weight percent TiOPc with water; drying said mixture so as to be substantially free of water; following drying said mixture, adding a further amount of crude crystalline, substantially chlorine-free TiOPc sufficient to form a new mixture containing more than 75 weight percent of substantially chlorine-free TiOPc; and treating said new mixture under conditions effective to form a substantially amorphous mixture of TiOFPc and TiOPc containing more than 75 weight percent of substantially chlorine-free TiOPc.