Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1984-09-05
1985-12-31
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
2105002, 264302, B28B 126, B28C 102, B29D 2708
Patent
active
045620210
ABSTRACT:
The present invention relates to a method of manufacturing a medium for microfiltration, for ultrafiltration, or for reverse osmosis, wherein hydrolysis is performed on an alkoxide, an organo-metallic compound, or a metal salt of an organic or an inorganic acid, optionally dissolved in an anhydrous organic solvent, in order to obtain a sol of particles of the oxide or of the hydroxide of the corresponding chemical element, a thickening agent is added to the sol, and the resulting sol is slip cast onto a support layer having pores which are larger than pores desired for the filter medium, the thin layer deposited on the support medium is then dried, and then heat treated to eliminate the thickening agent and to sinter the particles of the deposited thin layer. The thickening agent is added to the sol in conjunction with a strong acid whose anion does not form a complex with ions of the oxide or hydroxide metal, and the slip casting is performed by mere putting into contact without filtering.
REFERENCES:
patent: 3874899 (1975-04-01), Miszenti et al.
patent: 3944658 (1976-03-01), Yoldas
patent: 4251377 (1981-02-01), Schleinitz
Yoldas, Bulent E., "A Transparent Porous Alumina", In Ceramic Bulletin, vol. 54, No. 3, (1975), pp. 286-288.
Alary Jean-Andre
Cot Louis
Gugliermotte Francis
Guizard Christian
Larbot Andre
Anderson Philip
Ceraver S.A.
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