Powdered microcapsules and their preparing process

Application Number: 00103439
Application Date: 2000.03.10
Publication Number: 1266738
Publication Date: 2000.09.20
Priority Information: 1999/3/12 JP 66442/99; 1999/3/12 JP 66626/99
International: B01J13/02;C09D11/02
Applicant(s) Name: Sakura color Products Corp.
Inventor(s) Name: Yamaguchi Norihiro
Patent Agency Code: 11219
Patent Agent: ding yebeng
Abstract To provide microcapsules capable of exhibiting excellent dispersibility. A process for preparing powdery microcapsules, the process comprising: (1) a first step of dispersing a hydrophobic material in an aqueous solution containing an anionic, water-soluble polymer; (2) a second step of adding an amino aldehyde resin to the aqueous solution to form a slurry containing microcapsules each comprising the hydrophobic material and a resin film formed on the surface of the hydrophobic material; and (3) a third step of performing the following step (a) or (b): (a) a step of surface-treating, with a surfactant, the microcapsules recovered by removing the aqueous solution from the slurry (b) a step of removing the aqueous solution from the slurry so that the proportion of the anionic, water-soluble polymer to the powdery microcapsules becomes 0.01 wt.% or less.