Abstract
AbstractWaterborne nanoscale pigment red 122 dispersions were prepared by phase separation method and milling method with dispersant, respectively. The properties of these dispersions were studied and compared, and also, the encapsulation process was investigated. It was found that the pigment dispersion prepared by phase separation method had higher stability, smaller particle size, and narrower particle size distribution than those milling method with dispersant. The apparent viscosity of pigment dispersion prepared by phase separation method was lower than that prepared by milling method with dispersant when the weight ratio of styrene‐maleic acid copolymer (PSMA) to pigment is below 14%. The change of contact angle indicated that the wettability of encapsulated pigment was greatly improved. On the basis of our results, a schematic representation was given for the illustration of the whole encapsulation process. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008
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