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US 5,300,358 AGranted
Degradable absorbant structures
AssigneeE. I. Du Pont de Nemours and Company
InventorGlenn R. Evers
Life of this patent
Estimating the term…
Abstract
Compostible and flushable absorbent structures for sanitary uses for the absorption of body fluids comprising an absorbent degradable fibrous core and a backsheet that is cold-water soluble but water impermeable.
Claims23
A structure absorbent to aqueous fluids comprising a non-rigid core and a backsheet, said core comprising an absorbent, degradable fibrous material;
- and said backsheet comprising sheet material that is cold-water soluble, which backsheet has a external discontinuous repellent surface;
- said surface comprising a hydrophobic material that;
- (i) is substantially discontinuous on the surface of the backsheet, said material covering at least about 80% of the total backsheet surface area that will be contacted by said fluids;
- and
- (ii) has a critical surface tension less than about 54 dynes/cm and sufficiently lower than the surface tension of said fluids to give an advancing contact angle between the surface layer and said fluid of at least 70.degree., thereby preventing said fluid from physically contacting the backsheet.
2 more elements
Dependencies are inferred from the claim text.