Patent ID: 8889885
Filing Date: 2014-11-18
Classification: B01D,C09B

Abstract:
1. A method for producing nanoparticles, the method comprising: providing at least two processing surfaces arranged opposite to each other, the at least two processing surfaces being configured to be able to approach to and separate from each other, at least one of which rotating relative to the other; providing at least two kinds of fluids to be processed, wherein, at least one of the at least two kinds of fluids is a diketopyrrolopyrrole pigment solution containing at least one kind of diketopyrrolopyrrole pigment dissolved in a solvent and at least one of the at least two kinds of fluids other than the above-mentioned is an alcohol solvent containing at least one kind of alcohol compound solvent; and mixing the at least two kinds of fluids to be processed to separate the diketopyrrolopyrrole pigment thereby providing the method for producing the nanoparticles, wherein: of the diketopyrrolopyrrole pigment solution and the alcohol solvent, at least any one of the fluids to be processed contains an acidic substance, the diketopyrrolopyrrole pigment solution and the alcohol solvent are mixed in a thin film fluid formed between the at least two processing surfaces, thereby separating the diketopyrrolopyrrole pigment, and a pH value of a mixed solution obtained by mixing the at least two kinds of fluids in the thin film fluid formed between the at least two processing surfaces is less than or equal to 7, so that substantially only α-type diketopyrrolopyrrole pigment nanoparticles are separated without substantially separating a β-type diketopyrrolopyrrole pigment.