US 11,944,526 B2
Absorbent cores having material free areas
Andrea Andrew Peri, Kronberg (DE); Aniruddha Chatterjee, Kelkheim (DE); Peter Dziezok, Hochheim (DE); Bruno Johannes Ehrnsperger, Bad Soden (DE); Juliane Kamphus, Schwalbach (DE); and Marion Lutsche, Schwalbach (DE)
Assigned to The Procter & Gamble Company, Cincinnati, OH (US)
Filed by The Procter & Gamble Company, Cincinnati, OH (US)
Filed on Sep. 23, 2021, as Appl. No. 17/482,657.
Application 17/482,657 is a continuation of application No. 16/159,780, filed on Oct. 15, 2018, granted, now 11,154,437.
Application 16/159,780 is a continuation of application No. 14/462,621, filed on Aug. 19, 2014, granted, now 10,130,527, issued on Nov. 20, 2018.
Claims priority of application No. 13185212 (EP), filed on Sep. 19, 2013; and application No. 14168157 (EP), filed on May 13, 2014.
Prior Publication US 2022/0008264 A1, Jan. 13, 2022
Int. Cl. A61F 13/15 (2006.01); A61F 13/532 (2006.01); A61F 13/534 (2006.01); A61F 13/535 (2006.01); A61F 13/539 (2006.01); A61L 15/42 (2006.01); A61L 15/58 (2006.01); A61L 15/60 (2006.01); C08F 120/06 (2006.01); C08F 220/06 (2006.01); C08J 3/24 (2006.01); C08L 33/02 (2006.01); A61F 13/53 (2006.01)
CPC A61F 13/5323 (2013.01) [A61F 13/534 (2013.01); A61F 13/535 (2013.01); A61F 13/539 (2013.01); A61L 15/42 (2013.01); A61L 15/58 (2013.01); A61L 15/60 (2013.01); C08F 120/06 (2013.01); C08F 220/06 (2013.01); C08J 3/245 (2013.01); C08L 33/02 (2013.01); A61F 2013/530481 (2013.01); A61F 2013/53051 (2013.01); A61F 2013/530715 (2013.01); A61F 2013/53472 (2013.01); C08J 2333/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An absorbent article for personal hygiene comprising:
a liquid permeable topsheet;
a liquid impermeable backsheet;
an absorbent core disposed between the topsheet and the backsheet; and
an acquisition/distribution layer disposed between the absorbent core and the topsheet;
wherein the absorbent core comprises:
a core wrap enclosing an absorbent material comprising a combination of superabsorbent polymer particles and airfelt, the core wrap comprising a top side and a bottom side;
one or more pairs of areas substantially free of absorbent material through which the top side of the core wrap is attached to the bottom side of the core wrap, so that when the absorbent material swells the core wrap forms one or more pairs of channels along the areas substantially free of absorbent material;
wherein at least one pair of the one or more pairs of areas substantially free of absorbent material is arranged symmetrically relative to a longitudinal axis;
wherein the superabsorbent polymer particles have a time to reach an uptake of 20 g/g (T20) of less than 240s, as measured according to a K(t) test method; and
wherein the attachment between the top side core wrap and the bottom side core wrap is achieved through adhesive bonding, pressure bonding, ultrasonic bonding, heat bonding, or combinations thereof.