Process for manufacturing pigments
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Aug 13, 2002
Grant Date -
N/A
app pub date -
Feb 23, 2000
filing date -
Feb 23, 2000
priority date (Note) -
Expired
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Abstract
A pigment is synthesized in an aqueous medium and the pigment dispersion is purified by ultrafiltration or microfiltration. In particular, an aqueous pigment dispersion having a very small average particle size and a narrow particle size distribution may be prepared by the steps of (a) synthesizing a pigment in an aqueous medium and (b) removing an impurity such as a dissolved synthesis by-product or unreacted starting material through cross flow filtration using a membrane having an average pore diameter of from about 3 nanometers to about 3000 nanometers to produce a purified aqueous pigment dispersion.
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