Absorbent Article Having a Reduced Humidity Level

Patent metadata

Field	Value
Publication number	US-2020155375-A1
Application number	US-201816631885-A
Country	US
Kind code	A1
Filing date	Jul 20, 2018
Priority date	Jul 28, 2017
Publication date	May 21, 2020
Grant date	—

Abstract

An absorbent article comprising an absorbent member positioned between a topsheet and a backsheet is provided. The absorbent member contains at least one layer that comprises porous superabsorbent particles, wherein the particles exhibit a relative humidity microclimate of about 67% or less after being exposed to an atmosphere having a temperature of about 23° C. and relative humidity of 80% for a time period of 20 minutes.

First claim

1 . An absorbent article comprising an absorbent member positioned between a topsheet and a backsheet, wherein the absorbent member contains at least one layer that comprises porous superabsorbent particles, wherein the particles contain a porous network that includes a plurality of nanopores and wherein the nanopores have an average cross-sectional dimension of from about 10 to about 500 nanometers, wherein the particles exhibit a relative humidity microclimate of about 67% or less after being exposed to an atmosphere having a temperature of about 23° C. and relative humidity of 80% for a time period of about 20 minutes.

2 . The absorbent article of claim 1 , wherein the layer further contains a fibrous material.

3 . The absorbent article of claim 2 , wherein the fibrous material includes absorbent fibers, synthetic polymer fibers, or a combination thereof.

4 . The absorbent article of claim 3 , wherein the absorbent fibers contain pulp fibers.

5 . The absorbent article of claim 3 , wherein the synthetic polymer fibers include meltblown fibers.

6 . The absorbent article of claim 1 , wherein the superabsorbent particles are mixed into a matrix of the fibrous material.

7 . The absorbent article of claim 1 , wherein the superabsorbent particles constitute from about 20 wt. % to about 90 wt. % of the layer of the absorbent member.

8 . The absorbent article of claim 1 , wherein the superabsorbent particles exhibit an Absorption Rate of about 300 g/g/ks or more after being placed into contact with an aqueous solution of 0.9 wt. % sodium chloride for 0.015 kiloseconds.

9 . The absorbent article of claim 1 , wherein the superabsorbent particles exhibit a Vortex Time of about 80 seconds or less.

10 . The absorbent article of claim 1 , wherein the particles exhibit an Absorption Rate of about 600 to about 1,500 g/g/ks or more after being placed into contact with an aqueous solution of 0.9 wt. % sodium chloride for 0.015 kiloseconds.

11 . The absorbent article of claim 1 , wherein the superabsorbent particles exhibit a total absorbent capacity of about 10 g/g or more after being placed into contact with an aqueous solution of 0.9 wt. % sodium chloride for 3.6 kiloseconds.

12 . The absorbent article of claim 1 , wherein the particles exhibit a Centrifuge Retention Capacity of about 20 g/g or more.

13 . The absorbent article of claim 1 , wherein the particles exhibit a relative humidity microclimate of about 67% or less after being exposed to an atmosphere having a temperature of about 23° C. and relative humidity of 80% for a time period of from about 20 minutes to about 150 minutes.

14 . The absorbent article of claim 1 , wherein the nanopores have an average cross-sectional dimension of from about 15 to about 450 nanometers.

15 . The absorbent article of claim 14 , wherein the porous network further comprises micropores.

16 . The absorbent article of claim 14 , wherein at least about 25 vol. % of the porous network is formed by the nanopores.

17 . The absorbent article of claim 1 , wherein the particles are formed from a crosslinked polymer that contains repeating units derived from one or more ethylenically unsaturated monomeric compounds having at least one hydrophilic radical.

18 . The absorbent article of claim 17 , wherein the monomeric compounds are monoethylenically unsaturated.

19 . The absorbent article of claim 17 , wherein the hydrophilic radical includes a carboxyl, carboxylic acid anhydride, carboxylic acid salt, sulfonic acid, sulfonic acid salt, hydroxyl, ether, amide, amino, quaternary ammonium salt group, or a combination thereof.

20 . The absorbent article of claim 17 wherein the polymer contains repeating units derived from a (meth)acrylic acid monomeric compound or a salt thereof.

21 . The absorbent article of claim 17 , wherein the polymer contains an alkoxysilane functionality.

22 . The absorbent article of claim 1 , wherein the particles have a median size of from about 50 to about 2,000 micrometers.

23 . The absorbent article of claim 1 , wherein the particles have a specific surface area of about 0.2 square meters per gram or more as determined in accordance with ISO 9277:2010.

24 . The absorbent article of claim 1 , wherein the absorbent member contains an absorbent core that includes the superabsorbent particles.

25 . The absorbent article of claim 24 , wherein the absorbent member further contains a surge layer positioned adjacent to the absorbent core.

26 . The absorbent article of claim 25 , wherein a wrapsheet covers the absorbent core.

Assignees

• Kimberly Clark Co

Inventors

• Galabura Yuriy
• Mlieziva Mark M
• Macdonald J Gavin
• Topolkaraev Vasily A
• Mcbride Michelle
• Rodriguez Karien J
• Valaskey Matthew
• Soerens Dave
• Scholl Neil T
• Lee Wanduk

Classifications

• A61L15/425 Primary

  Porous materials, e.g. foams or sponges · CPC title

• A61F2013/15967

  by meltblown technique · CPC title

• A61F13/53713

  the layer having a promotional function on liquid propagation in the vertical direction · CPC title

• A61F13/53 Primary

  characterised by the absorbing medium (A61F13/20 takes precedence) · CPC title

• A61F2013/530737

  by the absorbent capacity · CPC title