1997 Volume 25 Issue 5 Pages 267-273
Pigment dispersion technology plays an important role in attaining basic coating qualities such as a ”high quality appearance” and ”high durability”. Authors' experiments have quantitatively proved that a basic principle in pigment dispersion was an ”acid-base interaction between pigment and resin” in either non-aqueous or aqueous mediums, by optical and rheological measurements of pigment dispersions. These dispersions were prepared from pigments, acid-base characteristics of which were measured by a new method developed in our laboratory.
A conventional pigment dispersing resin, called an ”amphoteric resin”, was also developed using a new idea that any conventional pigment having a variety of acid-base characteristics must be well dispersed, when a resin containing both acid and base functions was used.
Pigments with almost no acid and/or base characteristic could be, however, well dispersed when the pigments were surface modified to have either an acid or base characteristic by plasma surface treatment. This result also supported that the ”acid-base interaction” was important in pigment dispersion.
