Feminine hygiene absorbent articles comprising water-absorbing composites
This invention relates to a feminine hygiene absorbent article comprising water-absorbing composites obtainable by foaming an aqueous mixture comprising at least one monoethylenically unsaturated monomer bearing acid groups, at least one crosslinker, at least one initiator and at least one surfactant, contacting the foam obtained with at least one web of synthetic fibers and polymerizing, to the composites themselves and to their use for absorbing aqueous fluids.
1. A feminine hygiene absorbent article comprising a water-absorbing composite comprising at least one superabsorbent foam layer and at least one web layer,
wherein the at least one superabsorbent foam layer is obtained by foaming an aqueous mixture comprising at least one monoethylenically unsaturated monomer bearing acid groups, at least one crosslinker, at least one initiator, at least one foaming agent and at least one surfactant;
wherein the at least one web layer consisting of polyester fibers and having a basis weight of not more than 200 g/m 2 and a thickness of not more than 5 mm;
wherein a full thickness of the web is completely penetrated by the foam such that the foam has an integral web support; and
wherein the water-absorbing composite only swells one-dimensionally when in contact with an aqueous fluid such that the water-absorbing composite swells in a thickness direction while an area of the water-absorbing composite remains unchanged.
2. The feminine hygiene absorbent article of claim 1 wherein the foam comprises at least one polymerized monoethylenically unsaturated monomer bearing at least one acid group.
3. The feminine hygiene absorbent article according to claim 2 wherein the acid groups of the polymerized monoethylenically unsaturated monomer are at least partly in a neutralized state.
4. The feminine hygiene absorbent article of claim 1 wherein the foam comprises at least one polymerized crosslinker.
5. The feminine hygiene absorbent article of claim 1 wherein the web is mechanically and/or thermally consolidated.
6. The feminine hygiene absorbent article of claim 1 wherein the foam is coated with at least one salt of a multivalent cation.
7. The feminine hygiene absorbent article of claim 1 , wherein said composite is obtained by applying the aqueous mixture comprising at least one monoethylenically unsaturated monomer bearing acid groups, at least one crosslinker, at least one initiator, at least one foaming agent, and at least one surfactant, to the web of polyester fibers such that a full thickness of the web is completely penetrated by the foam, and polymerizing.
8. The feminine hygiene absorbent article according to claim 7 wherein the composite is coated with at least one salt of a multivalent cation after the polymerization.
9. The feminine hygiene absorbent article of claim 7 wherein the water content of the composite is adjusted to a value between 1% and 60% by weight.
10. The feminine hygiene absorbent article of claim 1 , wherein said feminine hygiene absorbent article comprises a topsheet, a backsheet and an absorbent core comprised therebetween, wherein said absorbent core comprises said composite.
11. The feminine hygiene absorbent article according to claim 10 , wherein said feminine hygiene absorbent article is a sanitary napkin or a pantiliner.