发明名称 |
Process for producing a microcapsule |
摘要 |
Disclosed herein a process for producing a microcapsule having an excellent solvent-resistance and a thermal stability, and an extremely minute amount of unreacted formaldehyde, comprising the steps of dispersing a substance to be encapsulated into an aqueous solution containing a water-soluble cationic urea resin, at least one prepolymer selected from the group consisting of a melamine-formaldehyde prepolymer, a urea-formaldehyde prepolymer and a melamine-urea-formaldehyde prepolymer and an anionic surfactant and then, adding an acid-catalyst into the thus obtained aqueous dispersion thereby forming a wall membrane which encapsulates the dispersed microparticle of the substance to be encapsulated by polycondensing the prepolymer and the cationic urea resin followed by cross-linking while causing complex coacervation, and adding a monosaccharide into the aqueous dispersion while adjusting the pH of the aqueous dispersion with the addition of a hydroxide of an alkaline earth metal thereby removing the unreacted residual formaldehyde remaining in the aqueous dispersion.
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申请公布号 |
US4460722(A) |
申请公布日期 |
1984.07.17 |
申请号 |
US19820351598 |
申请日期 |
1982.02.23 |
申请人 |
KUREHA KAGAKU KOGYO KABUSHIKI KAISHA |
发明人 |
IGARASHI, YURIKO;OKADA, YOSHIO |
分类号 |
A61K9/50;B01J13/18;B01J13/20;B41M5/165;(IPC1-7):C08K5/07;C08J3/10;C08J3/16 |
主分类号 |
A61K9/50 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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