Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
2002-08-23
2004-03-23
Green, Anthony J. (Department: 1755)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C106S031600, C106S412000, C106S494000, C106S495000, C106S496000, C106S497000, C106S498000, C366S101000
Reexamination Certificate
active
06709507
ABSTRACT:
FIELD OF THE INVENTION
The present invention is directed to a method of stabilizing organic pigment particles, which had been previously surface modified, typically by exposure to plasma-activated process gases.
BACKGROUND OF THE INVENTION
Due to the hydrophobic nature of organic pigment particles, it is difficult to disperse them in compositions, such as coating compositions or inks, such as ink jet inks. It has been known that pigment particle surfaces can be modified to increase their self-dispersibility in water or solvent borne compositions. One of the methods used for pigment surface modification is to add a surface modifier, either an ionic or non-ionic surfactant, such as an acid or glycol containing polymer, which permits the pigment to be fully dispersed in a composition. Another method used for pigment surface modification is to expose the pigment particles to ozone or plasma-activated process gases. One problem associated with plasma activated surface modification is that it results in creating highly exothermic sites on the surface of pigment particles that tend to rapidly react upon exposure to ambient air. As a result, it becomes unsafe to handle these highly exothermic surface modified pigment particles. Moreover, self-dispersibility of these highly exothermic pigments tends to suffer once the pigment has undergone the exothermic event.
The present invention solves the problem of unsafe, difficult to handle pigment particles that have been surface modified by exposure to ozone or the plasma activated gases.
THE STATEMENT OF THE INVENTION
The present invention is directed to 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.
The present invention is also directed to 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.
REFERENCES:
patent: 3157659 (1964-11-01), Werner et al.
patent: 3256285 (1966-06-01), Fuchs et al.
patent: 3257405 (1966-06-01), Gerson et al.
patent: 3317539 (1967-05-01), Jeffe et al.
patent: 4158572 (1979-06-01), Blackburn et al.
patent: 4257951 (1981-03-01), Matrick
patent: 4478643 (1984-10-01), Kuwahara et al.
patent: 4685419 (1987-08-01), Nakajima
patent: 5175282 (1992-12-01), Roth et al.
patent: 5278384 (1994-01-01), Matsuzawa et al.
patent: 5296523 (1994-03-01), Kobayashi et al.
patent: 5340618 (1994-08-01), Tanisaki et al.
patent: 5620743 (1997-04-01), Harth et al.
patent: 6136286 (2000-10-01), Okuyama et al.
patent: 6156114 (2000-12-01), Bell et al.
patent: 6383301 (2002-05-01), Bell et al.
patent: 19511240 (1995-10-01), None
patent: 0655516 (1995-05-01), None
patent: 1059337 (2000-12-01), None
patent: 1502884 (1978-03-01), None
patent: WO 9729156 (1997-08-01), None
patent: WO 0052102 (2000-09-01), None
M. A. Perkins, “Six-membered Heterocyclic Vat Dyes Pyridines and Pyridones” in The Chemistry of Synthetic Dyes and Pigments, American Chemical Society Monograph Series, 1955, pp. 481-482, (no month).
M. S. Whelen, “Anthraquinoneazines” In The Chemistry of Synthetic Dyes & Pigments, American Chemical Society Monograph Series, 1955, pp. 512-522, (no month).
Bigelow et al., “Phthalocyanine Pigments” in The Chemistry of Synthetic Dyes & Pigments, American Chemical Society Monograph Series, 1955, pp. 584-587, (no month).
S. S. Labana. 1967, Quinacridones, Chemical Review, 67, No. 1, pp 1-18, (no month).
H. Zollinger, 1991, Color Chemistry, Synthesis, Properties & Applications of Organic Dyes & Pigments, Principles of Preparation, pp. 101-104, (no month).
H. Zollinger, 1991, Color Chemistry, , Syntheses, Properties & Applications of Organic Dyes & Pigments, Higher Anellated Vat Dyes, pp. 219-220, (no month).
H. Zollinger, 1991, Color Chemistry, Properties & Applications of Organic Dyes & Pigments, Higher Anellated Vat Dyes, pp. 227-228, (no month).
H. Zollinger, 1991, Color Chemistry, Synthesis, Properties & Applications of Organic Dyes & Pigments, Carbonyl Pigments, pp. 236-237, (no month).
H. Zollinger, 1991, Color Chemistry, Syntheses, Properties & Applications of Organic Dyes & Pigments, Physical Conditioning of Pigments, pp. 296-298, (no month).
JP-3-090334, Abstract, Nippon Paint Co., Ltd, Apr. 16, 1991, Powdery Material Surface Treatment—by applying voltage to gas, containing activated gas with powdery material in fluidising tank etc.
W. Herbst et al., 1993, Industrial Organic Pigments, Production, Properties, Applications, Inc., pp. 9, (no month).
W. Herbst and K. Hunger, 1993, Industrial Organic Pigments, Production, Properties, Applications, pp. 398-415, (no month).
W. Herbst and K. Hunger, 1993, Industrial Organic Pigments, Production, Properties, Applications, pp. 418-427, (no month).
W. Herbst and K. Hunger, 1993, Industrial Organic Pigments, Production, Properties, Applications, pp. 467-475, (no month).
W. Herbst and K. Hunger, 1993 Industrial Organic Pigments, Production, Properties, Applications, pp. 498-503, (no month).
Copy of the International Search Report International Application No. PCT/US02/26873, Aug. 23, 2002.
Hohman James L.
Witman Sandra L.
Yeh An-Gong
Deshmukh Sudhir G.
E. I. du Pont de Nemours and Company
Green Anthony J.
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