Absorbent structure with improved water-swellable material
First Claim
1. An absorbent structure for use in an absorbent article, said absorbent structure comprising a water-swellable material that comprises particles, which have a core and a shell, and that comprise water-swellable polymers and elastomeric polymer(s), said water-swellable material having an absorbent capacity of at least about 20 g/g (as measured in the 4-hour CCRC test) and a QUICS value of at least about 15.
1 Assignment
0 Petitions
Accused Products
Abstract
This invention relates to improved absorbent structures containing improved water-swellable material that can significantly withstand deformation by an external pressure, thus showing improved liquid handling properties. In particular, this invention relates to absorbent structures comprising water-swellable material with an improved absorbent capacity/permeability balance. The water-swellable material is typically in the form of particles, which comprise a core of water-swellable polymer(s) and a shell of said elastomeric polymer(s), preferably selected polyetherpolyurethanes, whereby the water-swellable material is such that it can withstand deformation due to external pressure. The invention also relates to diapers, adult incontinence articles and sanitary napkins comprising said absorbent structure of the invention.
161 Citations
17 Claims
- 1. An absorbent structure for use in an absorbent article, said absorbent structure comprising a water-swellable material that comprises particles, which have a core and a shell, and that comprise water-swellable polymers and elastomeric polymer(s), said water-swellable material having an absorbent capacity of at least about 20 g/g (as measured in the 4-hour CCRC test) and a QUICS value of at least about 15.
-
2. An absorbent structure for use in an absorbent article, said absorbent structure comprising a water-swellable material that comprises water-swellable polymers, said water-swellable material having an absorbent capacity of at least about 20 g/g (as measured in the 4-hour CCRC test), a Saline Absorbent Capacity after grinding (SAC″
- ) and a QUICS value wherein said QUICS value is more than;
(5/3)+SAC″
×
(5/12).
- ) and a QUICS value wherein said QUICS value is more than;
-
3. An absorbent structure for use in an absorbent article, said absorbent structure comprising a water-swellable material, which comprises water-swellable polymers, said water-swellable material having an absorbent capacity of at least about 20 g/g (as measured in the 4-hour CCRC test) and a QUICS value of at least about 10, wherein said water-swellable material comprises at least one polyetherpolyurethane elastomeric polymer(s), said polyetherpolyurethane comprising alkylene oxide units on at least one of a group selected from polymer main chains and polymer side chains.
-
4. An absorbent structure for use in an absorbent article, said absorbent structure comprising a water-swellable material, which comprises water-swellable polymer particles, said water-swellable material having an absorbent capacity of at least about 20 g/g (as measured in the 4-hour CCRC test) and a QUICS value, wherein:
said water-swellable polymer particles are spray-coated water-swellable polymer particles with a substantially homogeneous coating of an elastomeric polymer, said coating being annealed, and said water-swellable material has a QUICS value of more than about 10.
Specification