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US 5,180,637 AGranted
Double-walled microcapsules and a process for preparation of same
AssigneeSakura Color Products Corporation
InventorMasaaki Sumii
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AssigneeSakura Color Products Corporation
InventorMasaaki Sumii
Estimating the term…
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.
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:
A process for preparing double-walled microcapsules, comprising the steps of:
Dependencies are inferred from the claim text.