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US 6,486,099 B2Granted
Microcapsule and process for production thereof
AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorsYutaka Igari, Yuzi Hori, Tsuneo Okamoto
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AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorsYutaka Igari, Yuzi Hori, Tsuneo Okamoto
Estimating the term…
A microcapsule (or microencapsulated product) having a uniform and smooth coating film and also an excellent performance of gradually liberating the content material is produced at a good particle size distribution while suppressing the occurrence of isolated or aggregated film material, aggregated microcapsules and isolated core material. The production process includes: a first coating step of mixing a water-soluble cationic amino resin and an anionic surfactant in the presence of a hydrophobic core material dispersed in an aqueous medium to coat the dispersed core material with a coacervate of the cationic amino resin and the anionic surfactant; and a second coating step of adding an amino resin prepolymer into an aqueous dispersion liquid containing the coated dispersed core material and polycondensating the amino resin prepolymer to further coat the coated dispersed core material with a polycondensate of the amino resin prepolymer.
A microcapsule, comprising a particulate core material, and a laminar coating layer including (i) a solidified layer of coacervate of a water-soluble cationic amino resin and an anionic surfactant, and (ii) a layer of polycondensate of amino resin prepolymer, successively coating the particulate core material, wherein the water-soluble cationic amino resin is a water-soluble cationic product of at least one amino resin selected from the group consisting of urea-aldehyde resin, melamine-aldehyde resin and guanamine-aldehyde resin.
A process for producing a microcapsule, comprising:
Dependencies are inferred from the claim text.