METHOD FOR PRODUCING ORGANIC PIGMENT MICROPARTICLES

WIPO Patent Application WO/2017/047732

A1

The present invention addresses the problem of providing a method for producing organic pigment microparticles whereby growth and/or agglomeration of particles can be reliably suppressed. This method includes a step 1, wherein: an organic pigment raw material solution obtained by mixing a raw material of an organic pigment in a solvent, and a precipitation solvent for precipitating microparticles of the organic pigment from the organic pigment raw material solution are introduced into between at least two treatment surfaces 1, 2 that are disposed facing one another so as to be able to draw closer together or apart and at least one of which rotates relative to the other; a thin-film fluid is formed as a result of the foregoing and said solution and solvent are mixed in said fluid; and the microparticles of the organic pigment are precipitated. The method further includes a step 2, wherein at least some of the microparticles of the organic pigment are covered with an oxide coating. The oxide coating is optically colorless and transparent. Step 1 and step 2 are performed consecutively within the thin-film fluid. In the thin-film fluid, step 2 is completed in a predetermined time until the microparticles of the organic pigment grow after step 1.

ENOMURA MASAKAZU (JP)
TAKEDA KAZUTAKA (JP)
HONDA DAISUKE (JP)

PCT/JP2016/077378

March 23, 2017

September 16, 2016

Click for automatic bibliography generation  

M TECHNIQUE CO LTD (JP)

C09B67/08; B01F27/93; C09B67/02; C09B67/20

WO2010100794A1

2010-09-10

JP2002337100A	2002-11-26
JP2011515567A	2011-05-19
JP2011057772A	2011-03-24
JPS63120766A	1988-05-25
JPH06287464A	1994-10-11
JP2008133319A	2008-06-12
JP2009082902A	2009-04-23

See also references of EP 3351597A4

SAMEJIMA Takenobu (JP)

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