Absorbent article comprising coated water-swellable material

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Reexamination Certificate

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C428S130000, C428S407000, C428S913000, C604S367000, C604S370000, C604S372000

Reexamination Certificate

active

10912001

ABSTRACT:
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 1 MPa. Typically, the coating agent comprises thereto an elastomeric polymeric material.

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