METHOD FOR PRODUCING PIGMENT-KNEADED PRODUCT AND AQUEOUS PIGMENT DISPERSION

WIPO Patent Application WO/2019/230415

A1

The present invention addresses the problem of providing a method for producing a pigment-kneaded product. The method can be used to produce an aqueous pigment dispersion having a very small volume average particle size and having few coarse particles and excellent storage stability even in the initial stage of production, and can be used to produce an ink that has excellent initial ejection stability and good ejection stability over time and that does not clog an ink ejection nozzle at the initial stage of ink ejection. The present inventors solved the problem by a method for producing a pigment-kneaded product, the method being characterized by comprising: a step [1] for supplying at least a pigment and a resin to a container provided in a kneading apparatus; and a step [2] for kneading the content (a1) of the container until the storage elastic modulus at an angular frequency of 1 rad/s falls within the range of 200-30000 kPa as determined by a dynamic viscoelasticity measurement at 25°C.

SUGO KENJI (JP)
HAYAKAWA KOHEI (JP)
OKADA SHINICHI (JP)
SATO YOSHIHIRO (JP)

PCT/JP2019/019470

December 05, 2019

May 16, 2019

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DAINIPPON INK & CHEMICALS (JP)

C09D17/00; B01F23/57; B01F29/90; C09C3/04; C09C3/10; C09D11/322

JP2012219144A	2012-11-12
JP2017114926A	2017-06-29
JP2014136777A	2014-07-28
JP2003226832A	2003-08-15

"Complex Shear Viscosity Using A Parallel-plate Oscillatory Rheometer", JIS K, 2005, pages 7244 - 10
JIS K, 2005, pages 7224 - 10
See also references of EP 3805324A4

OGAWA Shinji (JP)

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