Process for manufacturing of deodorizing air filters

Details Process for manufacturing of deodorizing air filters Process for manufacturing of deodorizing air filters

1975-09-05

1977-09-20

Gwinnell, Harry J.

Coating processes

With post-treatment of coating or coating material

Heating or drying

55316, 55524, B32B 2712, C09D 376

Patent

active

RE0294101

ABSTRACT:
Process for manufacturing a deodorizing gas filter which comprises dissolving polyvinyl alcohol in water; adding to said solution at least one substance which is an amphoteric ion exchange resin, activated carbon or coconut shell charcoal, thereby forming a pasty mass; adding to said pasty mass glyoxal, in an amount in excess of that which would be sufficient to acetalize the polyvinyl alcohol, and a small amount of acid for the acetal formation; impregnating the resulting composition into a non-woven textile fabric gas filter; and heating said impregnated filter at about 70.degree.-100.degree. C for 30 minutes to 2 hours, thereby converting said polyvinyl alcohol to polyvinyl acetal.

REFERENCES:
patent: 2186598 (1940-01-01), Bachman
patent: 2409548 (1946-10-01), Debacher
patent: 2843502 (1958-07-01), Fay
patent: 3627567 (1971-12-01), Tensho

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