Process for producing pigment nanoparticle

Details Process for producing pigment nanoparticle Process for producing pigment nanoparticle

2007-03-20

2007-03-20

Green, Anthony J. (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S493000, C106S494000, C106S495000, C106S496000, C106S497000, C106S498000, C106S499000, C106S503000, C106S504000

Reexamination Certificate

active

10525228

ABSTRACT:
The process for producing highly concentrated nanometer-size fine particles of an organic pigment, which comprises dissolving the organic pigment in an amide solvent, especially an organic solvent comprising at least 50 vol % 1-methyl-2-pyrrodinone, and pouring the resultant organic pigment solution with stirring into a poor solvent which is not compatible with the organic pigment. The pigment may be a quinacridone pigment, phthalocyanine pigment etc. Any atmospheric pressure to a sub-critical and/or supercritical state can be employed as the production conditions.

REFERENCES:
patent: 4997454 (1991-03-01), Violante et al.
patent: 2002/0040665 (2002-04-01), Dietz et al.
patent: 1195413 (2002-04-01), None
patent: 06-079168 (1994-03-01), None
patent: 11130974 (1999-05-01), None
patent: 2000-026774 (2000-01-01), None
patent: 2002-138229 (2002-05-01), None

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