Enzymatically dispersible non-woven webs
AssigneeMinnesota Mining and Manufacturing Company
InventorsGeorge H. Crawford, Charles F. Nawrot, Ronald F. Ofstead
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Abstract
A self-supporting, non-woven composite web is described which is readily dispersible in aqueous media containing enzymes. The web comprises intersecting randomly or partially oriented fibers and has low wet-strength in the absence of a binder, the fibers being bonded in web form by a polymeric binder which is attacked and disintegrated by enzymes, thus permitting the fibers to disperse rapidly in aqueous milieu containing enzymes. The webs of the invention are useful for production of articles useful for absorbing body wastes, e.g. diapers, bandages, etc.
Claims17
A self-supporting, non-woven composite fibrous web which is readily dispersible in aqueous milieu containing enzyme, consisting essentially of a non-woven web of relatively short fibers having surfaces which confer only low wet-strength upon the web in the absence of a binder and in combination therewith a water-insoluble, normally solid, enzyme-disintegratable binder which consists of the reaction product of a polymer containing at least one ethylenically unsaturated monomer covalently bonded with a naturally occurring, enzyme-degradable, water-soluble polymeric material, said binder being present in effective amount ranging from about 0.3 percent to about equal amount by weight of said fibers in said non-woven web, sufficient to impart to said non-woven web wet-strength in the absence of enzyme of from about 0.5 to 10 kg/cm.sup.2 and resistance to dispersion in water for at least 30 minutes, and to permit dispersion of said non-woven web in a period ranging from about 5 to 30 minutes in aqueous milieu containing enzyme capable of degrading said water-soluble polymeric material to disintegrate said binder and thereby to render said web dispersible.
Dependencies are inferred from the claim text.