Process for producing aqueous pigment dispersion and aqueous pigment dispersion obtained by the process
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United States of America Patent
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Issued Date -
Nov 25, 2004
app pub date -
Jun 28, 2004
filing date -
Jun 26, 2001
priority date (Note) -
Abandoned
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Abstract
The present invention is to provide a method of producing pigment dispersions which can be suitably used in the fields where higher levels of coloring manifesting ability and fluidity are required, such as in ink jet recording liquids or color filter coloring compositions, and in which pigments are dispersed to such a finer particle size that renders them applicable in the field of printing inks or the like as well and, further, which show very good pigment dispersion stability even after the lapse of time. The present invention is directed to a method of producing aqueous pigment dispersions which comprises a mixture comprising a pigment, at least one species selected from the group consisting of polymeric emulsifiers having an HLB value of not less than 5 and surfactants having an HLB value of not less than 5, and an aqueous medium passing through an orifice having neither curves nor bends under pressure and, further, ejecting said mixture into that preceding portion of the mixture which has been ejected and is retained in a hollow member larger in diameter than the orifice to thereby attain dispersion of the pigment in the aqueous medium.
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