| 摘要 |
PURPOSE: To obtain hollow particles which can develop high coloring power and shielding power by producing microcapsule particles from a hydrophobic material and then extracting with using an org. solvent which does not dissolve the self-water dispersible resin which constitutes the particles but permeates through the resin and dissolves the hydrophobic material in the particles. CONSTITUTION: The resin particles having vacancy inside (hollow particles) which can be used for various kinds of coating materials such as coating liquid, paper, fiber, leather, and cosmetic products are produced by the following method. A self-water dispersion resin (A) and a hydrophobic material (B) which is insoluble with the resin (A) are mixed in an org. solvent (C) which can dissolve the resin (A). The obtd. mixture soln. I is phase inversed in water and emulsified to produce particles of the self-water dispersion resin (A) including the hydrophobic material (B) inside. Then an org. solvent (D) which does not dissolve the self-water dispersion resin (A) but permeates through the resin (A) and can dissolve the hydrophobic material (B) is used to extract the hydrophobic material (B) included in the particles. Then the particles are dried to complete the production of desired hollow particles. |
