US Patent 7192477 Process for producing pigment nanoparticle

Patent 7192477 was granted and assigned to Japan Science and Technology Agency on March, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Japan Science and Technology Agency

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

71924770

Date of Patent

March 20, 2007

Patent Application Number

105252280

Date Filed

April 2, 2003

Patent Primary Examiner

‌

Anthony J Green

Patent 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.