Process for manufacturing of deodorizing air filters
AssigneeC. Weinberger & Co., Ltd.
InventorToshio Yoshino
Life of this patent
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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.
Claims7
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 the 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 polyvinylacetal.
Dependencies are inferred from the claim text.