Heat-induced formation of co-crystalline composition containing titanyl phthalocyanine and titanyl fluorophthalocyanine
View Patent ↗A process for forming a cocrystalline mixture of titanyl phthalocyanine (TiOPc) and titanyl fluorophthalocyanine (TiOFPc) includes: dry milling a mixture of crude TiOPc and crude TiOFPc, thereby forming an amorphous pigment mixture of TiOPc and TiOFPc; and heating the amorphous pigment mixture at a temperature effective to form a cocrystalline composition comprising titanyl phthalocyanine (TiOPc) and titanyl fluorophthalocyanine (TiOFPc), the cocrystalline composition being characterized by an X-ray diffraction spectrum exhibiting intensity peaks at 7.2°, 12.9°, 16.3°, 22.3°, 24.6°, 26.2°, and 28.8° with respect to X-rays of Cu Kαat a wavelength of 1.54 1 Å of the Bragg angle 2θ.
1. A process for forming a cocrystalline mixture of titanyl phthalocyanine (TiOPc) and titanyl fluorophthalocyanine (TiOFPc) comprising:
dry milling a mixture of crude TiOPc and crude TiOFPc, thereby forming a dry amorphous pigment mixture of TiOPc and TiOFPc; and
heating the dry amorphous pigment mixture at a temperature effective to form a cocrystalline composition comprising titanyl phthalocyanine (TiOPc) and titanyl fluorophthalocyanine (TiOFPc), said cocrystalline composition being characterized by an X-ray diffraction spectrum exhibiting intensity peaks at 7.2°, 12.9°, 16.3°, 22.3°, 24.6°, 26.2°, and 28.8° with respect to X-rays of Cu Kα at a wavelength of 1.54 1 Å of the Bragg angle 2θ.
2. The process of claim 1 wherein said dry amorphous pigment mixture is heated at a temperature of from about 150° C. to about 250° C.
3. The process of claim 2 wherein said dry amorphous pigment mixture is heated at a temperature of from about 170° C. to about 220° C.
4. The process of claim 1 wherein said dry amorphous pigment mixture is heated for from about 15 minutes to about 3 hours.
5. The process of claim 4 wherein said dry amorphous pigment mixture is heated for from about 30 minutes to about 2 hours.
6. The process of claim 1 wherein said cocrystalline composition contains TiOPc and TiOFPc in a TiOPc:TiOFPc weight ratio of from about 90:10 to about 50:50.
7. The process of claim 6 wherein said cocrystalline composition contains TiOPc and TiOFPc in a TiOPc:TiOFPc weight ratio of from about 75:25 to about 65:35.