Porous glass membrane tubes

Details Porous glass membrane tubes Porous glass membrane tubes

1984-04-12

1988-10-25

Kendell, Lorraine T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

65 301, 65 31, 428391, 428392, 428 36, 21050023, 21050024, 210506, 210509, B32B 900, B01D 3900, B01D 3908

Patent

active

047803690

ABSTRACT:
The invention relates to a process for producing a tubular glass membrane with wall thicknesses between 5 and 30 microns and reproducible pore sizes between 11 A and 50 A. Alkali borosilicate glass is drawn into discrete hollow tubes and immediately cooled. The tubes are thermally treated to effect a phase separation into a coherent silicon dioxide phase and a boron oxide phase rich in alkali borate. The boron oxide phase is leached out with mineral acid. The tubes can be subsequently treated to give enlarged or reduced pores, asymmetric pores and coated surfaces.

REFERENCES:
patent: 2531571 (1950-11-01), Hyde
patent: 2965925 (1960-12-01), Dietzsch, Sr.
patent: 3485687 (1969-12-01), Chapman
patent: 3498826 (1970-03-01), Coroselli et al.
patent: 3498909 (1970-03-01), Littman
patent: 3692186 (1972-09-01), Marzocchi
patent: 3904422 (1975-09-01), Eaton
patent: 3956179 (1976-05-01), Sebestian et al.

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