Non-vitreous ceramic metal oxide microcapsules and process for m

Details Non-vitreous ceramic metal oxide microcapsules and process for m Non-vitreous ceramic metal oxide microcapsules and process for m

1979-08-27

1982-09-14

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

106300, 206 06, 252 6256, 252316, 252477R, 423633, 264 4, 264 15, B01J 1302, C09K 300, C01G 4906, B32B 518

Patent

active

043494560

ABSTRACT:
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.

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patent: 3313602 (1967-04-01), Smith et al.
patent: 3493514 (1970-02-01), Ashby et al.
patent: 3708432 (1973-01-01), Triggiani et al.
patent: 3788955 (1974-01-01), Crites et al.

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