Absorbent article containing a breathable material layer
AssigneeSCA Hygiene Products AB
InventorsMaria Fernkvist, Ingrid Gustafson, Charlotta Hansson
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Abstract
An absorbent article includes a breathable backsheet material layer. At least a part of the layer includes a polymeric material exhibiting a discontinuous change in free volume in response to any of the following conditions or variables: liquid contact, the presence of certain ions, temperature and/or pH. One example of such polymeric materials is side chain liquid crystalline polymers which are able to undergo a phase transition between an isotropic phase and a nematic phase. The discontinuous change in free volume involves an abrupt change of the permeability of the breathable material layer.
Claims12
An absorbent article for absorption of bodily exudates, said article comprising an absorbent structure and a breathable backsheet material underlying said absorbent structure, wherein at least a part of said breathable backsheet material comprises a polymeric material exhibiting a discontinuous change in free volume in response to any of the following conditions or variables:
- liquid contact, the presence of certain ions, or change of pH.
An absorbent article for absorption of bodily exudates, said article comprising an absorbent structure and a breathable backsheet material underlying said absorbent structure, wherein at least a part of said breathable backsheet material comprises a polymeric material exhibiting a discontinuous change in free volume in response to any of the following conditions or variables:
- liquid contact, the presence of certain ions, change of temperature or change of pH,
- wherein said polymeric material exhibiting a discontinuous change in free volume is a side chain liquid crystalline polymer which is able to undergo a phase transition between an isotropic phase and a nematic phase at selected temperatures.
Dependencies are inferred from the claim text.