Deodorizing super-absorbent composition

1. An odor-absorbing superabsorbing composition, comprising:

i a post-crosslinked water-absorbing polymer structure having an average particle size in the range of about 515 μm to about 850 μm; and

ii an odor binder comprising as components

b1 an amino acid wherein said amino acid is cysteine; and

b2 a ricinolate compound of general formula I

with

R1 as a C 1 to C 20 hydrocarbon,

X as not present or a double bond system comprising in a range from 1 to about 5 double bonds;

M as a charged or uncharged metal;

m in a range from 1 to about 15;

n in a range from 1 to about 5;

o in a range from 1 to about 4,

wherein said odor binder is brought into contact with the surface of the post-crosslinked water-absorbing polymer structure after surface crosslinking such that the penetration depth of said odor binder into said surface of the post-crosslinked water-absorbing polymer structure is less than 2% of the diameter of the water-absorbing polymer structure wherein the odor-absorbing superabsorbing composition has an absorption against pressure of 0.7 psi (AAP(0.7 psi)) of from 21 g/g to 30 g/g.

2. The odor-absorbing superabsorbing composition according to claim 1 , wherein the ricinolate compound is zinc ricinolate.

3. The odor-absorbing superabsorbing composition according to claim 1 , further comprising less than 20 wt. %, based on the odor-absorbing superabsorbing composition, of a cross-linkable, non-crosslinked polymer.

4. The odor-absorbing superabsorbing composition according to claim 1 wherein the post-crosslinked water-absorbing polymer structure is surface crosslinked with a compound which is different from component b1.

5. The odor-absorbing superabsorbing composition according to claim 1 further comprising iii. a polymeric binder which is different from the post-crosslinked water-absorbing polymer structure.

6. The odor-absorbing superabsorbing composition according to claim 5 , whereby the polymeric binder comprises two or more OH groups.

7. A composite comprising the odor-absorbing superabsorbing composition according to claim 1 .

8. A hygiene article comprising a liquid-permeable top sheet, a liquid impermeable back sheet and a composite according to claim 7 arranged between the top sheet and the back sheet.

9. A process for production of a superabsorbing composition, comprising the process steps of:

i providing a post-crosslinked water-absorbing polymer structure having an average particle size in the range of about 515 μm to about 850 μm; and;

ii bringing into contact of the surface of the post-crosslinked water-absorbing polymer structure with an odor binder comprising as components

b1 an amino acid wherein said amino acid is cysteine; and

b2 a ricinolate compound of general formula I

with

R1 as a C 1 to C 20 hydrocarbon;

X as not present or a double bond system comprising in a range from 1 to 5 double bonds;

M as a charged or uncharged metal;

m in a range from 1 to about 15;

n in a range from 1 to about 5;

o in a range from 1 to about 4

wherein said odor binder is brought into contact with the surface of the post-crosslinked water-absorbing polymer structure after surface crosslinking such that the penetration depth of said odor binder into said surface of the post-crosslinked water-absorbing polymer structure is less than 2% of the diameter of the water-absorbing polymer structure

wherein the odor-absorbing superabsorbing composition has an absorption against pressure of 0.7 psi (AAP(0.7 psi)) of from 21 g/g to 30 g/g.

10. The process according to claim 9 wherein the ricinolate compound is zinc ricinolate.

11. The process according to claim 9 wherein the water-absorbing polymer structure has a water content of less than 10 wt. %, based on the polymer structure.

12. The process according to claim 9 wherein less than 20 wt. %, based on the composition, of a cross-linkable, non-crosslinked polymer is used as a binder.