Non-vitreous ceramic metal oxide microcapsules and process for making same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-013/02
C09K-003/00
C01G-049/06
B32B-005/18
출원번호
US-0069794
(1979-08-27)
발명자
/ 주소
Sowman Harold G. (Maplewood MN)
출원인 / 주소
Minnesota Mining and Manufacturing Company (St. Paul MN 02)
인용정보
피인용 횟수 :
123인용 특허 :
0
초록▼
Shaped and fired, porous or impermeable nonvitreous ceramic microcapsules of metal oxide, preferably transparent and polycrystalline, are made by a non-melt process comprising the liquid-liquid extraction of aqueous metal oxide precursor with a dehydrating liquid having a limited water solubility, a
Shaped and fired, porous or impermeable nonvitreous ceramic microcapsules of metal oxide, preferably transparent and polycrystalline, are made by a non-melt process comprising the liquid-liquid extraction of aqueous metal oxide precursor with a dehydrating liquid having a limited water solubility, and drying and firing the resulting gelled microcapsules. For example, an aqueous titania sol is added to an agitated body of n-butanol to form a dispersion of droplets of said sol and water is rapidly extracted from the droplets to form gelled microcapsules; the latter are recovered by filtration, dried, and fired to convert them into transparent, sealed or heat-sealable, non-vitreous ceramic, spherical microcapsules of polycrystalline titania. The microcapsules can be used as fillers for plastic and other composites or filled with a selected solid, liquid or gas for purpose of storing, transporting, or facilitating the use of the same.
대표청구항▼
A process for making spherical microcapsules comprising the steps of adding percursor material comprising an aqueous solution, dispersion or sol of one or more metal oxides (or compounds calcinable to metal oxide) to a liquid body of a dehydrating agent comprising an organic dehydrating liquid, agit
A process for making spherical microcapsules comprising the steps of adding percursor material comprising an aqueous solution, dispersion or sol of one or more metal oxides (or compounds calcinable to metal oxide) to a liquid body of a dehydrating agent comprising an organic dehydrating liquid, agitating said liquid body to maintain the resulting droplets of said precursor material in suspension and prevent settling thereof, to maintain relatively anhydrous dehydrating liquid in contact with the surface of said droplets as they are dehydrated, and to rapidly extract within 30 seconds at ambient temperatures of 20°to 40°C. the major amount of water from said droplets and form gelled microparticles therefrom, the predominant amount of said gelled microparticles being in the form of spherical, gelled, porous, liquid-filled microcapsules, recovering said liquid-filled microcapsules, drying the resulting recovered microcapsules at temperatures and pressures adjusted to minimize fracture and bursting the same and remove liquid from within the recovered microcapsules, and firing the resulting dried microcapsules to form spherical ceramic microcapsules the peripheral wall or shell of each which encloses the single hollow within the interior thereof being porous and heat-sealable, homogeneous, and made of non-vitreous ceramic comprising polycrystalline metal oxide or amorphous metal oxide convertible to polycrystalline metal oxide upon firing at higher temperature. Spherical, free-flowing, discrete microcapsules, the peripheral wall or shell of each which encloses the single hollow within the interior thereof being uniformly thick, homogeneous, impermeable, filled with a liquid and made of non-vitreous ceramic consisting essentially of polycrystalline metal oxide or amorphous metal oxide convertible to polycrystalline metal oxide upon firing.
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