Absorbent article comprising coated water swellable material

Details Absorbent article comprising coated water swellable material Absorbent article comprising coated water swellable material

A - Human Necessities

61

L

A61L 15/00 (2006.01) A61L 15/42 (2006.01) A61L 15/60 (2006.01)

Patent

CA 2534743

This invention is directed to an absorbent structure comprising a solid, typically particulate, water-swellable material that comprises coated water- swellable, preferably hydrogel-forming polymers, which are coated with a coating agent, which is such that it does not rupture when the polymers swell in a liquid, e.g. water or saline water. Hereto, the coating agent is extensible in wet state and comprises thereto a wet-extensible material that has a wet-elongation of at least 400% or even at least 500%, and preferably a tensile stress at break in the wet state of at least 1MPa. Typically, the coating agent comprises thereto an elastomeric polymeric material.

La présente invention concerne une structure absorbante contenant une matière gonflable dans l'eau, généralement particulaire, solide contenant des polymères formant de préférence des hydrogels, gonflables dans l'eau recouverts par un agent de revêtement spécifique qui ne se rompt pas, lorsque les polymères se dilatent dans un liquide, tel que l'eau ou l'eau saline. Ledit agent de revêtement est donc dilatable à l'état humide et il contient une matière dilatable à l'état humide qui possède un allongement à l'état humide d'au moins 400 %, voire même d'au moins 500 % et, de préférence, une contrainte de traction au niveau de la rupture à l'état humide d'au moins 1MPa. Généralement, ledit agent de revêtement contient une matière polymère élastomère.

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