| 摘要 |
The invention relates to double-walled microcapsules each having a core of a hydrophobic substance, and a primary wall and a secondary wall formed therearound, the microcapsules being characterized in that the primary wall is composed of an amino resin prepared by polycondensation reaction of at least one member selected from the group consisting of: (1) urea and formaldehyde, (2) a methylolurea monomer or a low molecular weight polymer thereof, and (3) a methylated methylolurea monomer or a low molecular weight polymer thereof, and that the secondary wall is formed from a polyion complex of a cationic polyamide-epihalohydrin resin having a urea bond in the structural unit with a polystyrenesulfonic acid and/or a salt thereof; and a process for preparing the double-walled microcapsules.
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