Novel process for producing pigment nanoparticle
AssigneeJapan Science and Technology Agency
InventorsHachiro Nakanishi, Koichi Baba, Hitoshi Kasai, Hidetoshi Oikawa, Shuji Okada
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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.
Claims18
A method for preparation of high concentrated nanometer size fine particles of organic pigment comprising, after dissolving organic pigment into organic solvent consisting of amide solvent, pouring the obtained pigment solution into solution, which is compatible with said solvent and is poor solvent to the pigment, by vigorously stirring.
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Dependencies are inferred from the claim text.