Title: Composite membrane
Application Number: 87103503 Application Date: 1987.04.16
Publication Number: 1017156 Publication Date: 1988.03.23
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: B01D67/00;B01D69/12;B01D71/02;C25D11/02
Applicant(s) Name: Alcan International Ltd. Address:
Inventor(s) Name: Ernest Paul Butler
Attorney & Agent: YANG HOUCHANG
Abstract:
    A composite sheet comprises a porous inorganic membrane and a microporous inorganic film overlying a surface of the membrane, where the membrane may be an anodic aluminium oxide membrane having an average pore diameter of 5 to 100 nm, and the microporous film is of substantially uniform pore size and substantially free of cracks and pinholes. The film may be formed by applying a colloidal sol of an aluminium alkoxide, or a solution of a polymeric precursor of a titanium oxide, to a surface of the membrane to form thereon a gel layer, and drying and heating the gel to convert it to a microporous inorganic film.
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