New White Pigment

Abstract

Titanium dioxide has been used in white ink, but it has the problem of sedimentation. Hollow resin particles are also used as the low specific gravity color material, but there are problems that they are softened and collapse by heat to dry on non-permeable media. In order to solve these problems, we focused on characteristics of inorganic hollow particles, especially hollow silica particles with low density in addition to heat and solvent resistance. Conventional hollow silica particles have problems of low white opacity and particle cracking. In this study, we synthesized hollow silica particles by the original method, which enables them to disperse in the ink while maintaining the hollow structure. We found that high white opacity was obtained despite low adhesion amount by controlling particle size diameter. In addition, we found that hollow silica particles have heat and solvent resistance and low sedimentation compared with titanium dioxide.