Process for manufacturing of deodorizing air filters

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°-100° C for 30 minutes to 2 hours, thereby converting said polyvinyl alcohol to polyvinyl acetal.

What is claimed is: 
     
       1. 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°-100° C. for 30 minutes to 2 hours, thereby converting said polyvinyl alcohol to polyvinylacetal. 
     
     
       2. Process as claimed in claim 1 wherein .[.the fibers of said non-woven fabric.]. .Iadd.said gas filter is a non-woven textile fabric gas filter, the fibers of which .Iaddend.are nylon. 
     
     
       3. Process as claimed in claim 1 wherein said substance is an amphoteric ion exchange resin and wherein said composition is hydrophilic. 
     
     
       4. Process as claimed in claim 1 wherein said substance is an amphoteric ion exchange resin. 
     
     
       5. Process as claimed in claim 1 wherein said substance is activated carbon. 
     
     
       6. Process as claimed in claim 1 wherein said substance is coconut shell charcoal. .Iadd. 7. Process as claimed in claim 1, wherein said non-woven textile fabric gas filter utilizes the fibers of at least one of nylon, cotton or other conventional synthetic or natural materials including foamed resinous materials. .Iaddend.