Coating processes – Foraminous product produced – Filter – sponge – or foam
Patent
1992-01-30
1992-09-01
Dawson, Robert A.
Coating processes
Foraminous product produced
Filter, sponge, or foam
55524, 55527, 12820619, 2105021, 427427, 4274301, 428283, A62B 1802
Patent
active
051437520
ABSTRACT:
A filtering material for effectively adsorbing not only conventional foreign material such as dust, odoring gaseous substance but also very fine foreign material such as virus, bacteria, fungus, pollen or the like is disclosed. The filtering material includes as essential components porous apatite particles, a water soluble glucan and a sheet-shaped raw material in which the porous apatite particles are included with the aid of the water soluble glucan serving as a binder. A method of producing a filtering material of the foregoing kind is practiced by way of a step of preparing an aqueous treatment solution in which porous apatite particles of 0.5 to 40% by weight and a water soluble glucan of 0.5 to 15% by weight are dispersively dissolved, a step of immersing a sheet-shaped raw material in the aqueous treatment solution, and a step of drying the sheet-shaped raw material while the porous apatite particles are included in the sheet-shaped raw material with the aid of the water soluble glucan serving as a binder. Alternatively, a step of spraying the aqueous treatment solution to surfaces of a sheet-shaped raw material may be substituted for the step of immersing a sheet-shaped raw material in the aqueous treatment solution. It is preferable from the viewpoint of practice use that the porous apatite particles make up between 0.5 and 30% of the treatment solution.
REFERENCES:
patent: 3929971 (1975-12-01), Roy
patent: 4503157 (1985-03-01), Hatahira
patent: 4856509 (1989-08-01), Lemelson
Nakajima Tooru
Tsuru Sumiaki
Bestex Kabushiki-Kaisha
Dawson Robert A.
Drodge Joseph
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