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    Process for making minute capsules and capsule product
    41.
    发明授权
    Process for making minute capsules and capsule product 失效
    制造分散胶囊和胶囊产品的方法

    公开(公告)号：US3594327A

    公开(公告)日：1971-07-20

    申请号：US3594327D

    申请日：1969-03-28

    Applicant: NCR CO

    Inventor： BECSEY JULIUS G

    IPC: B01J13/10 ,  B01J13/02 ,  B44D1/02 ,  B44D1/44

    CPC classification number: B01J13/10 ,  Y10T428/2984 ,  Y10T428/2987 ,  Y10T428/2989

    Abstract: A PROCESS FOR MAKING MINUTE CAPSULES IN WHICH MINUTE PARTICLES OF WATER-IMMISCIBLE MATERIAL, SUCH AS IRON OXIDE, AND HYDROPHILLIC, FILM-FORMING POLYMERIC MATERIAL, SUCH AS GELATIN, ARE DISPERSED IN WATER; COACERVATION IS INDUCED WHICH CAUSES THE POLYMERIC MATERIAL TO DEPOSIT ON EACH OF THE MINUTE PARTICLES AS A LIQUID WALL; AND A METALLIC CHELATING SALT, SUCH AS CHROMIC CHLORIDE OR COPPER SULFATE, IS ADDED TO HARDEN AND WATER-INSOLUBILIZE THE LIQUID DEPOSIT TO PRODUCE THE MINUTE, RIGID-WALLED CAPSULES.

    Process of encapsulating basic nitrogen compounds with alkali-precursor gelatin
    42.
    发明授权
    Process of encapsulating basic nitrogen compounds with alkali-precursor gelatin 失效
    用碱性前体凝胶包封碱性氮化合物的方法

    公开(公告)号：US3574132A

    公开(公告)日：1971-04-06

    申请号：US3574132D

    申请日：1968-01-12

    Applicant: MOSIER BENJAMIN ,  MICROCAP INC

    Inventor： MOSIER BENJAMIN ,  TIPPETT CHARLES E

    IPC: B01J13/10 ,  B01J13/02 ,  A01N17/00 ,  C23F11/14

    CPC classification number: B01J13/10 ,  Y10S507/902 ,  Y10S507/92 ,  Y10S507/939 ,  Y10T428/2984

    Abstract: PROCESS OF MICROENCAPSULATION EMPLOYING ALKALI-PRECURSOR (TYPE B) GELATIN AS THE ENCAPSULATING MACROCOLLOID, PARTICULARLY APPLICABLE TO THE FORMATION OF LIQUID CENTER MICROCAPSULES CONTAINING A BASIC (CATIONIC) NITROGEN COMPOUND. FOR EXAMPLE, AN AQUEOUS SOLUTION OF ALKALI-PRECURSOR GELATIN IS MIXED AT AN ALKALINE PH WITH A WATER-IMMISCIBLE ORGANIC SOLVENT SOLUTION OF A NITROGEN COMPOUND, SUCH AS AN AMINE OR A QUATERNARY. THE PH OF THE MIXTURE (VIZ, THE GELATIN PHASE) IS THEN REDUCED TO AT LEAST 4.5 AND PREFERABLY 3.8 OR BELOW, THE LIQUID PHASES BEING INTERMIXED TO DISPERSE AND EMULSIFY THE ORGANIC SOLVENT PHASE IN THE AQUEOUS PHASE, THEREBY PROVIDING MINUTE DROPLETS OF THE BASIC NITROGEN CONTAINING ORGANIC SOLVENT SURROUNDED BY THE AQUEOUS SOLUTION OF THE ALKALI-PRECURSOR GELATIN. AT THE LOW ACID PH, THE GELATIN FORMS A COATING ON THE DROPLETS AND PROVIDES ENCAPSULATING SKINS THEREFOR. WHILE THE ENCAPSULATED DROPLETS CAN BE RECOVERED AT THE LOW ACID PH, IT IS PREFERRED TO RAISE THE PH TO A PH ABOVE 5.5 (PREFERABLY 7.5-11), AND THEN RECOVER THE MICROCAPSULES. AN AUXILIARY COATING CAN BE APPLIED TO THE RECOVERED MICROCAPSULAR MATERIAL THUS PRODUCED BY CONTACTING THE MICROCAPSULES WITH AN AQUEOUS SOLUTION OF ACID-PRECURSOR GELATIN.

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