Comfortable diaper

• US 9,763,835 B2
• Filed: 08/04/2011
• Issued: 09/19/2017
• Est. Priority Date: 02/12/2003
• Status: Active Grant

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Becker, Uwe Jurgen, Busam, Ludwig, Ehrnsperger, Bruno Johannes, Lindner, Torsten, Link, Siegfried, Maier, Volker, Siddiquee, Sanaul Kabir, Stiehl, Gabriele, Tombuelt, Thomas
• Primary Examiner(s): Zalukaeva, Tatyana
• Assistant Examiner(s): TREYGER, ILYA Y
• Application Number:
  US13/198,235
• Publication Number:
  US 20110295222A1
• Time in Patent Office: 2,238 Days
• Field of Search: 604358, 604364, 604366, 604367
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• CPC Class Codes: A61F 13/5323 having absorbent material located in discrete regions, e.g. pockets
• CPC Class Codes: A61F 13/534 having an inhomogeneous composition through the thickness of the pad A61F13/538, A61F13/539 take precedence; homogeneous cores with tissue wrapping A61F13/53
• CPC Class Codes: A61F 13/535 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes A61F13/5323, A61F13/537 take precedence
• CPC Class Codes: A61F 13/539 characterised by the connection of the absorbent layers with each other or with the outer layers
• CPC Class Codes: A61F 2013/530481 having superabsorbent materials, i.e. highly absorbent polymer gel materials

Abstract

An absorbent article, preferably a disposable absorbent article such as a diaper, is disclosed that provides an improved immobilization of absorbent polymer material when the article is fully or partially urine loaded. This absorbent core is useful for providing an absorbent article of increased wearing comfort. Specifically disclosed is an absorbent core useful for an absorbent article comprising a substrate layer and absorbent material, the absorbent material comprising an absorbent polymer material, the absorbent material optionally comprising absorbent fibrous material, the absorbent fibrous material not representing more than 20% of the weight of absorbent polymer material, wherein the absorbent material is immobilized when wet such that the absorbent core achieves a wet immobilization of more than 50%, preferably of more than 60%, 70%, 80% or 90% according to the Wet Immobilization Test described herein.

Claims

1. An absorbent article comprising:

a chassis including a backsheet, a topsheet; and

an absorbent core located between the backsheet and the topsheet wherein the absorbent core comprises;

an adhesive and an absorbent polymer material, wherein the adhesive comprises a thermoplastic material and has a storage modulus (G′

) of at least 30,000 Pa at 20°

C.;

wherein the absorbent core further comprises a first substrate layer, wherein a discontinuous layer of the absorbent polymer material is deposited on the first substrate layer, wherein the adhesive is laid down onto the layer of absorbent polymer material and the adhesive contacts at least portions of the absorbent polymer material and at least portions of the first substrate layer forming areas of junction where, the adhesive contacts the first substrate layer where the first substrate layer is not covered by the absorbent polymer material in order to immobilize the absorbent polymer material on the first substrate layer;

wherein the absorbent polymer material is immobilized when wet such that the absorbent core achieves a wet immobilization of more than about 50% according to the Wet Immobilization Test described herein.

2. The absorbent article of claim 1, wherein the adhesive has a storage modulus (G′

) of less than 300,000 Pa at 20°

C.

3. The absorbent article of claim 1, wherein the adhesive has a loss angle tan Delta of less than 1 at 60°

C.

4. The absorbent article of claim 1, wherein the adhesive has a glass transition temperature T_g of less than 25°

C.

5. The absorbent article of claim 1, wherein the adhesive has a cross-over temperature T_x of greater than 80°

C.

6. The absorbent article of claim 1, wherein the adhesive is a fibrous layer of adhesive.

7. The absorbent article of claim 1, wherein the adhesive is a hot-melt adhesive.

8. The absorbent article of claim 1, wherein the adhesive substantially immobilizes the absorbent polymer material.

9. The absorbent article of claim 1, wherein the absorbent core has a distribution of absorbent polymer material, wherein the distribution of absorbent polymer material is profiled.

10. The absorbent article of claim 1 further comprising an auxiliary adhesive.

11. The absorbent article of claim 1, wherein the absorbent core further comprises a second substrate layer.

12. The absorbent article of claim 11, wherein a discontinuous layer of the absorbent polymer material is deposited on the second substrate layer.

13. The absorbent article of claim 12, wherein the adhesive contacts at least portions of the absorbent polymer material and at least portions of the second substrate layer forming areas of junction where the adhesive contacts the second substrate layer in order to immobilize the absorbent polymer material on the second substrate layer.

14. The absorbent article of claim 13, wherein the first and second substrate layers are combined together such that the adhesive of the first and second substrate layers contact one another and the absorbent polymer material of the first substrate layer faces the areas of junction of the second substrate layer and the absorbent polymer material of the second substrate layer faces the areas of junction of the first substrate layer, wherein the first and second substrate layers do not contact each other.