Selectively surface-hydrophilic porous or perforated sheets
AssigneeThe Procter & Gamble Company
InventorIsao Noda
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Abstract
Surface-hydrophilic perforated sheets comprise a fluid-permeable hydrophobic sheet having a multiplicity of holes for fluid passage. The sheets are coated with a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties, whereby the surface of the sheet is rendered hydrophilic. The sheets are particularly useful as cover sheets for absorbent structures such as diapers, bandages, and catamenials.
Claims14
A selectively surface-hydrophilic article comprising a fluid permeable hydrophobic sheet having a multiplicity of holes or channels for fluid passage and having a fluid-directed front face and a back-face, said back-face of said sheet being substantially coated with a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties, whereby the back-face of said sheet is rendered hydrophilic and the front face of said sheet remains hydrophobic.
A sheet according to claim 5 wherein the average area of the holes is from about 0.001 to 1 square millimeters.
An absorbent article comprising:
- a. a fluid-retaining core, said core having a fluid-receiving surface;
- b. a fluid-permeable sheet comprising a multiplicity of holes or channels for fluid passage to said core, said sheet having a hydrophobic fluid-directed front face and a back face which adjoins the fluid-receiving surface of said core, said back face being surface-hydrophilic by virtue of a coating of a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties.
A method for enhancing fluid passage through a fluid-permeable sheet while reducing re-wet, comprising maintaining the fluid-directed front face of said sheet hydrophobic and coating the back face of said sheet with a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties.
Dependencies are inferred from the claim text.