Claims
- 1. A method of producing stabilized organic pigment particles, said method comprising:
surface modifying organic pigment particles; contacting said surface modified particles with an aqueous vapor entrained in a carrier gas to produce said stabilized organic pigment particles.
- 2. The method of claim 1 wherein stabilized organic pigment particles have a surface oxygen to carbon ratio of about 0.05 to 1.
- 3. The method of claim 1 wherein said carrier gas is argon, nitrogen, helium, neon, carbon dioxide, air or a mixture thereof.
- 4. The method of claim 1, 2 or 3 wherein weight of said aqueous vapor entrained in said carrier gas ranges from 10 to 500 micrograms per square meter of pigment surface area.
- 5. The method of claim 1 wherein said contacting step is accompanied by deagglomeration of said surface modified particles to increase exposure of said surface modified particles to said aqueous vapor.
- 6. The method of claim 1, 2, 3 or 5 wherein surface pH of said stabilized particles is 0.1 to 8.
- 7. The method of claim 1 wherein said particles are surface modified by exposing surfaces of said particles to a plasma-activated process gas.
- 8. The process of claim 6 wherein said process gas is selected from the group consisting of oxygen, nitrogen, water vapor, hydrogen peroxide, carbon dioxide, ammonia, ozone, carbon monoxide, trimethylsilane, tetraetoxysilane, hexamethyldisiloxane, ethylene diamine, maleic anhydride, arylamine, acetylene, methane, ethylene oxide, hydrogen, styrene, air, sulfur dioxide, sulfonyl precursors, phosphonyl precursors, alcohols, and a mixture thereof.
- 9. The method of claim 1 wherein said particles are surface modified by exposing surfaces of said particles to ozone.
- 10. The method of claim 1 wherein said organic particles comprise carbon black, diketo-pyrrolopyrrole red pigment, perylene maroon pigment, polybutadiene, polychloroprene, polyethylene, polypropylene, polyacrylonitirle, polymethacrylic acid, polyvinyl acetate, polyvinyl chloride, cellulose, copper phthalocyanine blue pigment 15:2,3,4, polychloro copper phthalocyanine, C.l. pigment green 7, quinacridone red pigment, quinacridone violet, copper phthalocyanine blue, C.l. Pigment Yellow-17, C.l Pigment Yellow-74, C.l. Pigment Yellow-83, C.l. Pigment Yellow-95, C.l. Pigment Yellow-128, C.l. Pigment Yellow-1 51 or C.l. Pigment Yellow-154.
- 11. Stabilized organic pigment particles produced in accordance with the method of claim 1.
- 12. Ink jet ink composition comprising stabilized organic pigment particles produced in accordance with the method of claim 1.
- 13. A coating composition comprising stabilized organic pigment particles produced in accordance with the method of claim 1.
- 14. A device for producing stabilized organic pigment particles comprising:
a reactor, means for introducing in said reactor aqueous vapor entrained in a carrier gas; and an agitator assembly for deagglomerating said pigment particles placed in said reactor.
- 15. The device of claim 14 further comprises means for supplying ozone to said reactor.
- 16. The device of claim 14 or 15 wherein said agitator assembly comprises:
a plurality of vanes mounted on a flange rotatably positioned in said reactor, each said vane having a coil affixed thereto such that said coils physically contact an inner wall of said reactor.
- 17. The device of claim 14 or 15 wherein said means for introducing in said reactor aqueous vapor entrained in a carrier gas comprise a lance having an opening positioned distally from an exhaust end of said reactor to increase dwell time of aqueous vapor inside said reactor.
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 60/314,337 (filed Aug. 23, 2001), which is incorporated by reference herein for all purposes as if fully set forth.
Provisional Applications (1)
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Number |
Date |
Country |
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60314337 |
Aug 2001 |
US |