METHOD FOR PRODUCING PIGMENT-KNEADED PRODUCT AND AQUEOUS PIGMENT DISPERSION
A problem to be solved by the present invention is to provide a method for producing a pigment-kneaded product that can be used for the production of an aqueous pigment dispersion having an extremely small volume-average particle diameter of a dispersed substance, including a small number of coarse...
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Main Authors | , , , |
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Format | Patent |
Language | English French German |
Published |
16.03.2022
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Subjects | |
Online Access | Get full text |
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Summary: | A problem to be solved by the present invention is to provide a method for producing a pigment-kneaded product that can be used for the production of an aqueous pigment dispersion having an extremely small volume-average particle diameter of a dispersed substance, including a small number of coarse particles even in the initial stage of production, and being excellent in terms of preservation stability and that can be used for the production of ink having excellent initial discharge stability and favorable temporal discharge stability which prevent the clogging of ink discharge nozzles or the like in the initial stage of ink discharge. The present inventors solved the problem by a method for producing a pigment-kneaded product having a step [1] of supplying at least a pigment and a resin to a container provided in a kneading apparatus and a step [2] of kneading the resulting content (content (a1)) present in the container until a storage elastic modulus of content (a1) at an angular frequency of 1 rad/s, which is obtained by measurement of dynamic viscoelasticity at 25°C, reaches a range of 200 kPa to 30,000 kPa. |
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Bibliography: | Application Number: EP20190811639 |