Absorbent cores comprising a superabsorbent polymer immobilizing material

1. An absorbent article comprising an absorbent core;

wherein the absorbent core comprises a superabsorbent polymer material and a superabsorbent polymer immobilizing material;

wherein the superabsorbent polymer immobilizing material comprises from about 20% to about 70% of a first polymer, by weight of the superabsorbent polymer immobilizing material;

wherein the superabsorbent polymer immobilizing material comprises from about 30% to about 80% of a second polymer, by weight of the superabsorbent polymer immobilizing material;

wherein the first polymer has a peak molecular weight of from about 65,000 g/mol to about 700,000 g/mol, according to the Peak Molecular Weight Test Method described herein;

wherein the first polymer is a random and/or block copolymer having ethylene derived units and/or C3-C10 alpha olefin derived units, or the first polymer is a polyolefinic homopolymer having ethylene derived units or propylene derived units or 1-butene derived units, or the first polymer is a styrenic block copolymer;

wherein the second polymer has a peak molecular weight of from about 1,000 g/mol to about 60,000 g/mol, according to the Peak Molecular Weight Test Method described herein;

wherein the second polymer is a polyolefin;

wherein the superabsorbent polymer immobilizing material has a Shear Viscosity at 10 (1/s) at 230° C. of from about 300 mPa·s to about 10,000 mPa·s, according to the Viscosity Rheometry Test Method described herein; and

wherein the superabsorbent polymer immobilizing material is substantially free of a tackifier.

2. The absorbent article according to claim 1 , wherein the peak molecular weight of the second polymer is from about 15,000 g/mol to about 60,000 g/mol.

3. The absorbent article according to claim 1 , wherein the superabsorbent polymer immobilizing material is a fiberized net structure.

4. The absorbent article according to claim 3 , wherein the superabsorbent polymer immobilizing material intertwines with the superabsorbent polymer material.

5. The absorbent article according to claim 1 , wherein the absorbent article further comprises a topsheet and a backsheet, with the absorbent core disposed therebetween.

6. The absorbent article according to claim 1 , wherein the absorbent core comprises a first absorbent layer comprising a first substrate, wherein at least a portion of the superabsorbent polymer material is deposited on the first substrate, wherein at least a portion of the superabsorbent polymer immobilizing material covers the superabsorbent polymer material, and wherein the first substrate is a nonwoven core cover.

7. The absorbent article according to claim 1 , wherein the superabsorbent polymer immobilizing material has a Wet Mobilization Value of less than 50%, according to the Wet Mobilization Test Method described herein.

8. The absorbent article according to claim 1 , wherein the superabsorbent polymer immobilizing material has a Storage Modulus at 100° C. of from about 200 Pa to about 400,000 Pa, according to the Oscillatory Rheometry Test Method described herein.

9. The absorbent article according to claim 1 , wherein the superabsorbent polymer immobilizing material has a Loss Factor at 100° C. of less than 5, according to the Oscillatory Rheometry Test Method described herein.

10. The absorbent article according to claim 1 , wherein the superabsorbent polymer immobilizing material has a Strain Hardening Index of from about 25 to about 1,000, according to the Extensional Test Method described herein.

11. The absorbent article according to claim 1 , wherein the peak molecular weight of the first polymer is from about 75,000 g/mol to about 500,000 g/mol when the first polymer is the random and/or block copolymer having ethylene derived units and/or C3-C10 alpha olefin derived units.

12. The absorbent article according to claim 1 , wherein the peak molecular weight of the first polymer is from about 65,000 g/mol to about 150,000 g/mol when the first polymer is the styrenic block copolymer.

13. An absorbent article comprising an absorbent core;

wherein the absorbent core comprises a superabsorbent polymer material and a superabsorbent polymer immobilizing material;

wherein the superabsorbent polymer immobilizing material comprises from about 20% to about 70% of a first polymer, by weight of the superabsorbent polymer immobilizing material;

wherein the superabsorbent polymer immobilizing material comprises from about 30% to about 80% of a second polymer, by weight of the superabsorbent polymer immobilizing material;

wherein the superabsorbent polymer immobilizing material has a Wet Mobilization Value of less than 50%, according to the Wet Mobilization Test Method described herein;

wherein the superabsorbent polymer immobilizing material has a Storage Modulus at 100° C. of from about 200 Pa to about 400,000 Pa, according to the Oscillatory Rheometry Test Method described herein;

wherein the superabsorbent polymer immobilizing material has a Strain Hardening Index of from about 25 to about 1,000, according to the Extensional Test Method described herein; and

wherein the superabsorbent polymer immobilizing material has a Shear Viscosity at 10 (1/s) at 230° C. of from about 300 mPa·s to about 10,000 mPa·s, according to the Viscosity Rheometry Test Method described herein.

14. The absorbent article according to claim 13 , wherein the superabsorbent polymer immobilizing material has a Strain at Break of from about 2.2 to about 8.5, according to the Extensional Test Method described herein.

15. The absorbent article according to claim 13 , wherein the first polymer has a peak molecular weight of from about 65,000 g/mol to about 700,000 g/mol, according to the Peak Molecular Weight Test Method described herein, and wherein the first polymer is a random and/or block copolymer having ethylene derived units and/or C3-C10 alpha olefin derived units, or the first polymer is a polyolefinic homopolymer having ethylene derived units or propylene derived units or 1-butene derived units, or the first polymer is a styrenic block copolymer.

16. The absorbent article according to claim 13 , wherein the second polymer has a peak molecular weight of from about 1,000 g/mol to about 60,000 g/mol, according to the Peak Molecular Weight Test Method described herein, and wherein the second polymer is a polyolefin.

17. The absorbent article according to claim 13 , wherein the superabsorbent polymer immobilizing material is substantially free of a tackifier.

18. An absorbent article comprising an absorbent core;

wherein the absorbent core comprises a superabsorbent polymer material and a superabsorbent polymer immobilizing material;

wherein the superabsorbent polymer immobilizing material comprises from about 20% to about 70% of a first polymer, by weight of the superabsorbent polymer immobilizing material;

wherein the superabsorbent polymer immobilizing material comprises from about 30% to about 80% of a second polymer, by weight of the superabsorbent polymer immobilizing material;

wherein the first polymer has a peak molecular weight of from about 20,000 g/mol to about 700,000 g/mol, according to the Peak Molecular Weight Test Method described herein;

wherein the first polymer is a random and/or block copolymer having ethylene derived units and/or C3-C10 alpha olefin derived units, or the first polymer is a polyolefinic homopolymer having ethylene derived units or propylene derived units or 1-butene derived units, or the first polymer is a styrenic block copolymer;

wherein the second polymer has a peak molecular weight of from about 1,000 g/mol to about 90,000 g/mol, according to the Peak Molecular Weight Test Method described herein;

wherein the first polymer is different than the second polymer;

wherein the superabsorbent polymer immobilizing material has a Shear Viscosity at 10 (1/s) at 230° C. of from about 300 mPa·s to about 10,000 mPa·s, according to the Viscosity Rheometry Test Method described herein;

wherein the superabsorbent polymer immobilizing material has a Strain Hardening Index of from about 25 to about 1,000, according to the Extensional Test Method described herein; and

wherein the superabsorbent polymer immobilizing material is substantially free of a tackifier.

19. The absorbent article according to claim 18 , wherein the Strain Hardening Index is from about 25 to about 175.

20. The absorbent article according to claim 18 , wherein the second polymer is a polyolefin.

21. The absorbent article according to claim 18 , wherein the absorbent core has channels, and wherein the channels are free of any absorbent material.

22. The absorbent article according to claim 18 , wherein the absorbent core is free of cellulosic fiber.

23. The absorbent article according to claim 18 , wherein the absorbent core further comprises cellulosic fiber.