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US 5,482,773 AGranted
Activated carbon-containing fibrids
AssigneeE. I. Du Pont de Nemours and Company
InventorThomas I. Bair
Life of this patent
Estimating the term…
Abstract
Polymeric fibrids containing embedded activated carbon are useful as adsorbents.
Claims7
A non-shedding sheet structure consisting essentially of aramid fibrids, activated carbon particles having a surface area of at least 500 m.sup.2 /g, and from about 2% to 50% by weight fiber floc wherein the activated carbon particles are encapsulated within the fibrids, by the process steps of:
- dispersing in a mixture containing a solvent and dissolved aramid polymer, carbon particles such that the weight ratio of carbon to polymer in the mixture is from 1:1 to 6:1 and introducing the mixture under vigorous stirring into a liquid which extracts the solvent and causes the polymer to precipitate as fibrid structures encapsulating the activated carbon particles such that the activated carbon particles retain 85 to 95% of their absorbent capacity per gram of carbon compared to that of a control as measured by the adsorption and retention of carbon tetrachloride vapor.
Dependencies are inferred from the claim text.