Claims
- 1. A process for forming a nanoparticulate crystalline titanium phthalocyanine pigment composition, said process comprising:
contacting a titanium phthalocyanine pigment with substantially pure 1,1, 2-trichloroethane (TCE) under conditions effective to convert said titanium phthalocyanine pigment to the nanoparticulate crystalline titanium phthalocyanine pigment composition.
- 2. The process of claim 1, wherein said contacting said titanium phthalocyanine pigment with substantially pure TCE is carried out using wet milling.
- 3. The process of claim 2, wherein said wet milling is carried out for a time period of about 10 minutes to about 96 hours.
- 4. The process of claim 3, wherein said wet milling is carried out for a time period of about 30 minutes to about 6 hours.
- 5. The process of claim 1, wherein said contacting said titanium phthalocyanine pigment with substantially pure TCE is carried out using ultrasonication.
- 6. The process of claim 5, wherein said ultrasonication is carried out for a time period of about 15 minutes to about 2 hours.
- 7. The process of claim 6, wherein said ultrasonication is carried out for a time period of about 10 minutes to about 1 hour.
- 8. The process of claim 1, wherein said titanium phthalocyanine pigment comprises a cocrystalline mixture of unsubstituted titanyl phthalocyanine (TiOPc) and titanyl fluorophthalocyanine (TiOFPc).
- 9. The process of claim 8, wherein said cocrystalline mixture of TiOPc and TiOFPc has a weight ratio of TiOPc:TiOFPc of about 99.5:0.5 to about 70:30.
- 10. The process of claim 9, wherein said cocrystalline mixture of TiOPc and TiOFPc has a weight ratio of TiOPc:TiOFPc of about 95:5 to about 75:25.
- 11. The process of claim 10, wherein said cocrystalline mixture of TiOPc and TiOFPc has a weight ratio of TiOPc:TiOFPc of about 87.5:12.5.
- 12. The process of claim 1, wherein said titanium phthalocyanine pigment comprises crystalline titanium fluorophthalocyanine (TiOFPc).
- 13. The process of claim 12, wherein said crystalline titanyl fluorophthalocyanine (TiOFPc) is a mixture comprising titanyl 2, 9, 16, 23-tetrafluorophthalocyanine, titanyl 2, 9, 16-trifluorophthalocyanine, titanyl 2-fluorophthalocyanine, titanyl 2, 9-difluorophthalocyanine, and titanyl 2, 16-difluorophthalocyanine.
- 14. The process of claim 1, further comprising:
combining said titanium phthalocyanine pigment with a polymeric binder in said substantially pure TCE.
- 15. The process of claim 14, wherein said polymeric binder comprises a polyester ionomer.
- 16. The process of claim 15, wherein said polyester ionomer is poly{4,4-xylylene-co-2,2′-oxydiethylene (46/54) isophthalate-co-5-sodiosulfoisophthalate (85/15) }.
- 17. An electrophotographic charge generation layer comprising a nanoparticulate crystalline titanium phthalocyanine pigment composition formed by the process of claim 1.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] Reference is made to the following co-pending, commonly assigned applications, the disclosures of which are incorporated herein by reference:
[0002] U.S. Provisional Patent Application Serial No. 60/430,922, filed on Dec. 4, 2002, in the names of Molaire, et al., entitled SELF-DISPERSING TITANYL PHTHALOCYANINE PIGMENT COMPOSITIONS AND ELECTROPHOTOGRAPHIC CHARGE GENERATION LAYERS CONTAINING SAME;
[0003] U.S. Provisional Patent Application Serial No. 60/430,923, filed on Dec. 4, 2002, in the names of Molaire, et al., entitled TWO-STAGE MILLING PROCESS FOR PREPARING COCRYSTALS OF TITANYL FLUOROPHTHALOCYANINE AND TITANYL PHTHALOCYANINE, AND ELECTROPHOTOGRAPHIC ELEMENT CONTAINING SAME;
[0004] U.S. Provisional Patent Application Serial No. 60/430,779, filed on Dec. 4, 2002, in the names of Molaire, et al., entitled COCRYSTALS CONTAINING HIGH-CHLORINE TITANYL PHTHALOCYANINE AND LOW CONCENTRATION OF TITANYL FLUOROPHTHALOCYANINE, AND ELECTROPHOTOGRAPHIC ELEMENT CONTAINING SAME;
[0005] U.S. Provisional Patent Application Serial No. 60/430,777, filed on Dec. 4, 2002, in the names of Molaire, et al., entitled PROCESS FOR FORMING COCRYSTALS CONTAINING CHLORINE-FREE TITANYL PHTHALOCYANINES AND LOW CONCENTRATION OF TITANYL FLUOROPHTHALOCYANINE USING ORGANIC MILLING AID.
Provisional Applications (4)
|
Number |
Date |
Country |
|
60430219 |
Dec 2002 |
US |
|
60430923 |
Dec 2002 |
US |
|
60430779 |
Dec 2002 |
US |
|
60430777 |
Dec 2002 |
US |