Process for the preparation of microcapsules
    3.
    发明授权
    Process for the preparation of microcapsules 失效
    微胶囊制备方法

    公开(公告)号:US07807076B2

    公开(公告)日:2010-10-05

    申请号:US10493277

    申请日:2002-10-17

    IPC分类号: B01J13/02 B01J13/18 B41M5/165

    摘要: An improved process for the preparation of microcapsules consisting essentially of a wall material and a core material in condensing a melamine-formaldehyde precondensate and/or methyl ethers thereof in an aqueous dispersion of a water-insoluble core material and in the presence of an acrylic acid/acrylamide copolymer at acidic pH and at a temperature in the range of from 20° to 100° C., and hardening thereafter the melamine-formaldehyde precondensate to form the walls of the microcapsules at an elevated temperature, wherein the core material is dispersed in the precondensate/copolymer solution without initial partial condensation of the precondensate and copolymer and wherein the hydrophobe point of the precondensate and/or its methyl esters is less than 90° C., as well as microcapsules, paper and pressure-sensitive recording material comprising such microcapsules.

    摘要翻译: 一种用于制备基本上由壁材料和核心材料组成的微胶囊的改进方法,其在水不溶性核心材料的水分散体中和在丙烯酸存在下缩合三聚氰胺 - 甲醛预缩合物和/或其甲基醚 /丙烯酰胺共聚物,并且在20℃至100℃的温度范围内,然后硬化三聚氰胺 - 甲醛预缩合物以在高温下形成微胶囊的壁,其中芯材分散在 预缩合物/共聚物溶液,其不具有预缩合物和共聚物的初始部分缩合,并且其中预缩合物和/或其甲酯的疏水点小于90℃,以及微胶囊,纸和压敏记录材料 微胶囊。