Process for making microcapsules
    62.
    发明授权
    Process for making microcapsules 失效
    制备微生物的方法

    公开(公告)号:US3565559A

    公开(公告)日:1971-02-23

    申请号:US3565559D

    申请日:1969-03-06

    CPC classification number: A61K9/5089 B01J13/08 Y10T428/2984 Y10T428/2989

    Abstract: PROCESS OF MAKING MICROCAPSULES OF ACTIVE CHEMICAL SUBSTANCES, FOR EXAMPLE, TO PREVENT VITAMIN A FROM AIROXIDATION, COATING PIGMENT PARTICLES IN CARBONLESS PAPER, ETC., WHICH CONSISTS OF (1) FORMING AN AQUEOUS EMULSION OR SUSPENSION OF THE ACTIVE CHEMICAL SUBSTANCE, (2) ADDING AN AQUEOUS SOLUTION OF A GELABLE HYDROPHILIC SUBSTANCE AND THEN SURFACE ACTIVE AGENT AND DISPERSING A LIQUID SOLVENT IMMISCIBLE WITH THE SAID EMULSION OR SUSPENSION OR (2'') DISPERSING A MIXTURE OF THE SURFACE ACTIVE AGENT AND THE LIQUID SOLVENT INTO THE AQUEOUS EMULSION OR SUSPENSION, TO FORM A DISPERSION AT A TEMPERATURE ABOVE A GELATIN POINT OF THE EMULSION OR SUSPENSION, (3'') RAISING THE DISPERSION TEMPERATURE TO AN INVERSION TEMPERATURE OR (3") IN CASE THE USED SURFACE ACTIVE AGENT IS MONO-VALENT METALLIC AND ADDING AN AQUEOUS SOLUTION CONTAINING MULTIVALENT METALLIC ION, TO INVERSE THE DISPERSION PHASE TO FORM DROPLETS, (4) STIRRING, (5) COOLING TO THE ABOVE SAID GELATION POINT TO CAUSE THE DROPLETS TO FORM MICROCAPSULES, (6) ADDING AN AQUEOUS ELECTROLYTE SOLUTION TO HARDEN THE MICROCAPSULES, (7) ADDING WATER-ABSORPTIVE SUBSTANCE TO COAT THE MICROCAPSULES OR (7'') WASHING AND DEHYDRATING THE MICROCAPSULES BY LOWER ALKYL ALCOHOLS, (8) FILTERING TO SEPARATE THE MICROCAPSULES, AND (9) DRYING THE MICROCAPSULES.

    Method for producing hollow silica particles

    公开(公告)号:US12157673B2

    公开(公告)日:2024-12-03

    申请号:US18090557

    申请日:2022-12-29

    Abstract: To provide hollow silica particles having a dense silica shell layer.
    A method for producing hollow silica particles, which comprises: adjusting the pH of an oil-in-water emulsion containing an aqueous phase, an oil phase and a surfactant to at most 3.0 and adding a first silica material to the oil-in-water emulsion, adding a second silica material to the emulsion having the first silica material added, at its pH of at least 8, in the presence of alkali metal ions, to obtain a hollow silica precursor dispersion, and obtaining a hollow silica precursor from the hollow silica precursor dispersion and obtaining hollow silica particles from the hollow silica precursor.

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