AU2021406286A1

AU2021406286A1 - Incontinence article with ph regulator

Info

Publication number: AU2021406286A1
Application number: AU2021406286A
Authority: AU
Inventors: Christian BÄHRLE; Enno Gause; Rüdiger KESSELMEIER; Olga Vechter
Original assignee: Paul Hartmann AG
Current assignee: Paul Hartmann AG
Priority date: 2020-12-23
Filing date: 2021-12-21
Publication date: 2023-06-29
Also published as: EP4267066A1; WO2022136358A1; DE102020134790A1

Abstract

The present invention relates to an incontinence article for receiving bodily excretions, comprising a topsheet at least portions of which are liquid-permeable, a substantially liquid-impermeable backsheet and an absorption body arranged between the topsheet and the backsheet, the absorption body comprising a first absorbent layer, and a pH regulator being non-uniformly introduced into the first absorbent layer so that a center region of the absorption body and a front region of the absorption body and a rear region of the absorption body contain pH regulator, and in such a way that an amount per unit area of the pH regulator in the center region of the absorption body in g/m² is higher than in the front and/or in the rear region of the absorption body.

Description

Title: Incontinence article with pH regulator

Description

The present invention relates to an incontinence article for absorption of bodily excretions, comprising an agent for regulation of pH, to be preferably used by adults.

A common problem with the use of incontinence articles is the occurrence of skin irritation or dermatitis caused by contact of the skin with bodily excretions such as, for example, urine. What can often develop is so-called incontinence-associated dermatitis (IAD), an inflammation of the skin in the perineal or perigenital region that is caused by contact with an irritant such as urine. A major role is played here by changes in the pH of the skin upon contact with the more alkaline urine. In order to reduce such contact of the skin with urine, incontinence articles typically comprise superabsorbent materials, which can absorb and permanently bind large quantities of urine. In addition, an appropriate structure of the incontinence article, for example by using acquisition distribution layers inside the incontinence article, can make it possible for liquids to be absorbed into the incontinence article and conducted away from the skin of the user more rapidly. In some cases, incontinence articles also have openings, grooves or indentations that are intended to contribute to better liquid conduction and distribution in the incontinence article. Furthermore, substances are sometimes introduced into the absorbent material of the absorbent in order to regulate the pH of the absorbed body fluids. However, it is common in a micturition event for a large quantity of urine to hit the incontinence article in a short space of time, i.e., as a gush, and so this quantity cannot be sufficiently rapidly diverted by the article. The urine can initially collect in the crotch region of the incontinence article or spread on the surface of the absorbent starting from the point of impact into the surface, before it can be completely absorbed by the absorbent. This leads to prolonged skin contact over a large area, and so there may be slight skin irritation. There thus continues to be a need for improved incontinence articles. Incontinence articles for adults have been known for a long time and commonly comprise an at least regionally liquid-permeable topsheet, a substantially liquid impermeable backsheet, and an absorption body arranged between the topsheet and the backsheet. In principle, they can be designed in a variety of ways, for example as incontinence products in direct contact with the body or as absorbent bed pads. In the prior art, there are approaches to provide incontinence articles having an agent for pH control. W02012121932A1 teaches an absorbent article having a buffer composition which has been premixed with absorbent material or which has been arranged between two absorbent layers. The buffer composition in the dry state should not in any case have any contact with the topsheet. The inventors have discovered that such an arrangement has the disadvantage that the body fluid coming into contact with the buffer composition upon penetration into the absorbent core can wash it away when advancing into deeper absorbent plies or only comes into contact with the buffer composition in the first place in deeper absorbent plies. In addition, in the event of a sudden occurrence of a large amount of body fluid, it cannot in many cases be sufficiently rapidly absorbed into the absorbent, and so some of the liquid can spread on the surface of the article without any contact with the absorbent plies containing the buffer composition. Therefore, especially when body fluids hit the incontinence article as a gush, pH control on a skin-side surface of the article can be carried out unevenly and/or only unsatisfactorily. It is therefore an object of the present invention to overcome these disadvantages.

This object is achieved by incontinence articles for absorption of bodily excretions, comprising an at least regionally liquid-permeable topsheet, a substantially liquid-impermeable backsheet, and an absorption body arranged between the topsheet and the backsheet, wherein the absorption body comprises a first absorbent ply, and wherein a pH regulator is nonuniformly introduced into the first absorbent ply, so that a middle region of the absorption body and a front region of the absorption body and a rear region of the absorption body contain pH regulator such that an amount per unit area of the pH 2 regulator is, in g/m , greater in the middle region of the absorption body than in the front region and/or in the rear region of the absorption body. The front, middle and rear region of the absorption body can preferably be located on a longitudinal central axis of the absorption body. The front region can be located nearer to a front transverse edge of the absorption body, i.e., transverse edge of the absorption body that comes to rest on the ventral side during use, than the middle region and rear region. The rear region can be located nearer to a rear transverse edge of the absorption body, i.e., transverse edge of the absorption body that comes to rest on the dorsal side during use, than the middle region and front region. The middle region can preferably be located in the micturition region, i.e., in the region in which body fluids such as urine are highly likely to hit the incontinence article during use.

What is advantageously achieved by such a nonuniform distribution of the pH regulator is that the pH regulator is primarily provided in a region where body fluids such as, for example, urine first hit the incontinence article (micturition region), and so effective pH control is made possible even when large amounts of liquid suddenly occur. At the same time, the additional presence of pH regulator further forward and/or further rearward - relative to the middle region - in the absorption body is achieved, thereby improving pH control over a prolonged period and in regions of the absorption body further away from the micturition region. Especially when large amounts of urine hit as a gush, what can namely occur is that the liquid spreads on the surface of the incontinence article or the absorption body starting from the micturition region into the surface, before it can be completely absorbed by the absorption body.

Preferably, the amount per unit area of pH regulator in the middle region is 5 to 100 g/m 2 , in particular 10 to 2 2 50 g/m , further in particular 15 to 30 g/m . Further preferably, the amount per unit area of pH regulator in the front region and/or rear region is 0.1-50.0 g/m 2 , in particular 0.2-40.0 g/m 2 , further in particular 0.3-30.0 2 g/m 2 , further in particular 0.5-20.0 g/m .

In a preferred exemplary embodiment, the amount per unit area of the pH regulator is, in g/m 2 , greater in a middle longitudinal section of the absorption body than in a front longitudinal section and/or a rear longitudinal section of the absorption body. Here, the middle longitudinal section of the absorption body is arranged in a crotch region of the incontinence article, thus covering the point or region hit by urine during use (micturition region), and extends over a transverse central axis of the absorption body. The front longitudinal section of the absorption body directly adjoins the middle longitudinal section in the longitudinal direction in the direction of the front transverse edge of the absorption body and extends up to the front transverse edge of the absorption body. The rear longitudinal section of the absorption body directly adjoins the middle longitudinal section in the longitudinal direction in the direction of the rear transverse edge of the absorption body and extends up to the rear transverse edge of the absorption body. The boundaries between middle longitudinal section and front longitudinal section and between middle longitudinal section and rear longitudinal section both run in a straight line in the transverse direction of the incontinence article and orthogonally to a longitudinal central axis of the absorption body. With respect to its longitudinal extent, the middle longitudinal section of the absorption body is arranged symmetrically in relation to the transverse central axis of the absorption body. In the context of the present invention, a longitudinal extent of the middle longitudinal section of the absorption body is 30-65% of a total longitudinal extent of the absorption body. This means that, in any longitudinal section, the longitudinal extent of which is 30-65% of a total longitudinal extent of the absorption body and which, with respect to its longitudinal extent, is arranged symmetrically in relation to the transverse central axis of the absorption body, the amount per unit area of the pH regulator is, 2 in g/m , greater in said middle longitudinal section than in a respective front longitudinal section and/or rear longitudinal section of the absorption body. In particular, the longitudinal extent of the middle longitudinal section of the absorption body is 30-55%, further in particular 35-50%, further in particular 40 45%, further in particular 43% of the total longitudinal extent of the absorption body.

The middle, rear and front longitudinal section of the absorption body extends in the transverse direction of the absorption body over an entire width of the absorption body, and thus from a first longitudinal edge up to a second longitudinal edge. Longitudinal extent is to be understood to mean a maximum longitudinal extent of an element or longitudinal section. Transverse extent is to be understood to mean a maximum transverse extent of an element or longitudinal section.

The absorption body can be rectangular, triangular, oval, T-shaped, hourglass-shaped, anatomically shaped, asymmetrical or in any other shape that appears suitable to a person skilled in the art.

The backsheet can, in particular, comprise or be formed by a breathable, but substantially liquid-tight film material. The topsheet is preferably formed, at least regionally, from a nonwoven-based, at least regionally liquid-permeable material.

Preferably, the front longitudinal section and/or rear longitudinal section of the absorption body comprise pH regulator. As a result, it is also possible to achieve rapid pH regulation for partial amounts of urine that may first spread on the surface of the incontinence article when a gush hits and that are only absorbed in the rear longitudinal section or front longitudinal section of the absorption body. It is also conceivable that the front longitudinal section and/or rear longitudinal section of the absorption body are substantially free of pH regulator.

In a preferred exemplary embodiment, 5.00-30.00 g/m 2 , in particular 6.00-25.00 g/m 2 , further in particular 7.00 20.00 g/m 2 , further in particular 8.00-15.00 g/m 2 of pH regulator is arranged in the middle longitudinal section of the absorption body. Further preferably, there is arranged in the front longitudinal section and/or rear longitudinal section of the absorption body, in each case, 0.00-10.00 g/m 2 , in particular 0.10-9.00 g/m 2

, further in particular 0.20-7.00 g/m 2 , further in 2 particular 0.30-5.00 g/m of pH regulator.

In a preferred exemplary embodiment, the pH regulator is introduced in the first absorbent ply such that the concentration of the pH regulator in percent by weight is greater in a middle longitudinal section of the absorption body than in a front longitudinal section and/or a rear longitudinal section of the absorption body. As a result, it is advantageously possible to increase the amount (total amount and/or amount per unit area) of pH regulator in the middle longitudinal section independently of an increase in total amount of material of the absorption body and hence a change in thickness or change in density in the middle longitudinal section.

It should be mentioned here that the absorption body and/or the first absorbent ply can have a uniform thickness and/or a uniform density. It is also conceivable that the absorption body and/or the first absorbent ply has a thickness profile or height profile or a density profile.

The pH regulator can be introduced into the first absorbent ply in various ways. Preferably, the pH regulator is arranged on a surface of the first absorbent ply, in particular on a surface of the first absorbent ply that faces the topsheet. However, it is also conceivable that the pH regulator is arranged inside the first absorbent ply, uniformly or nonuniformly along the thickness direction of the first absorbent ply.

According to a preferred embodiment, a middle region of the absorption body can be located in the middle longitudinal section of the absorption body. According to a further advantageous embodiment, a front region of the absorption body can be located in the front longitudinal section of the absorption body. A front region of the absorption body can be additionally or alternatively, but also completely or sectionally, located in the middle longitudinal section of the absorption body. According to a further advantageous embodiment, a rear region of the absorption body can be located in the rear longitudinal section of the absorption body. A rear region of the absorption body can be additionally or alternatively, but also completely or sectionally, arranged in the middle longitudinal section of the absorption body.

The absorption body of the incontinence article is suited and intended for absorbing and permanently storing bodily excretions, in particular body fluids, in particular urine. To this end, the first absorbent ply preferably comprises a superabsorbent polymer (SAP).

In an advantageous embodiment, the first absorbent ply has a first region, wherein the SAP is introduced in the first region of the first absorbent ply such that the concentration of the SAP in percent by weight in a middle longitudinal section of the first region of the first absorbent ply is the same as in a front longitudinal section and/or a rear longitudinal section of the first region of the first absorbent ply. This has advantages in production, since, for example, the SAP can be uniformly premixed with the further material of the first region of the first absorbent ply and separate metered addition and/or arrangement of the SAP at high machine speed, which is relatively difficult, can be dispensed with.

In a preferred embodiment, the absorption body contains superabsorbent polymer material (SAP) to an extent of 5 100 percent by weight, preferably to an extent of 10-95 percent by weight, further preferably to an extent of 15-

90 percent by weight, very particularly preferably to an extent of 20-80 percent by weight. Typically, the SAP material can absorb at least 15 times, in particular 20 times, its weight of 0.9% by weight saline solution (measured in accordance with NWSP 242.0.R2(15)).

The SAP can, for example, be particulate or fibrous or planar or foamy. The SAP can furthermore comprise or consist of a substantially homogeneous polymer material or a mixture of two or more polymer materials.

The absorption body can contain further materials, such as cellulose fibers ("fluff") or plastic fibers. It is additionally conceivable to form the first absorbent ply and/or the second absorbent ply, which will be described in greater detail below, of the absorption body by arranging one or more layers of different material, in particular of nonwoven material.

In a preferred embodiment, the first absorbent ply comprises a channel oriented in the longitudinal direction, wherein at least a partial amount of the pH regulator is introduced into the channel. Since the channel serves for the primary absorption of body fluids such as urine and the subsequent forwarding thereof into more remote regions of the absorption body, the pH regulator introduced in the channel supports rapid pH control, and so the pH can be regulated before the body fluids are bound in the absorption body and, in particular, by SAP.

Preferably, the channel is arranged parallel to a longitudinal central axis of the absorption body and/or the first absorbent ply and/or the incontinence article. In particular, the channel is arranged on a longitudinal central axis of the incontinence article and/or the absorption body and/or the first absorbent ply.

Further in particular, the channel is symmetrical in relation to the longitudinal central axis of the incontinence article and/or the absorption body and/or the first absorbent ply. The channel is advantageously centeredly arranged in the transverse direction of the absorption body and/or the first absorbent ply. Advantageously, the channel is arranged in the longitudinal direction of the incontinence article in the region hit by urine during use. Furthermore, the channel advantageously extends over the transverse central axis of the absorption body. A preferred channel is arranged such that it is further away from the rear transverse edge of the absorption body than from the front transverse edge of the absorption body. However, the channel can also be arranged at the same distance away from the front transverse edge and rear transverse edge of the absorption body or further away from the front transverse edge of the absorption body than from the rear transverse edge of the absorption body.

In a preferred embodiment, the channel extends in a straight line in the longitudinal direction of the incontinence article and/or the absorption body and/or the first absorbent ply. As a result, the liquid can spread with less impediment in the channel in the longitudinal direction of the incontinence article. However, also conceivable are an undulating, serrated or arcuate channel shape or any other channel shape considered appropriate by a person skilled in the art. Different channel shapes such as, for example, rectangular, meandering, bone-shaped, T-shaped, triangular, oval, star-shaped or branched are well known in the prior art. However, the inventors have found that precisely those channels whose extent in the longitudinal direction of the incontinence article is greater than the extent thereof in the transverse direction are advantageous for rapid liquid conduction in the longitudinal direction. Especially rectangular, meandering or oval channels have been found to be advantageous.

In a preferred embodiment, the channel comprises or is formed from a cutout which extends through the first absorbent ply in the thickness direction. In this case, the channel is preferably substantially free of absorbent materials. To this end, the channel is formed by omission of the absorbent material or by removal of absorbent material by means of cutting or punching. However, it is also conceivable that the channel is formed by stamping or compressing of the first absorbent

ply.

According to a preferred embodiment, the first absorbent ply comprises a single channel. In an alternative embodiment, the first absorbent ply comprises more than one channel, in particular 2-5, further in particular precisely 2 channels.

In a preferred embodiment, the first region adjoins the channel; in particular, the first region completely surrounds the channel and at least a partial amount of the SAP, in particular the total amount of the SAP, of the first absorbent ply is introduced into the first region. As a result, the pH of the body fluid, in particular urine, absorbed into the channel can already be regulated before permanent binding by SAP.

In a further preferred embodiment, the absorption body comprises a second absorbent ply, wherein the second absorbent ply is arranged below the first absorbent ply, i.e., between first absorbent ply and backsheet. Further preferably, the second absorbent ply comprises less than 20 percent by weight, 15 percent by weight, 10 percent by weight, 5 percent by weight of SAP; in particular, the second absorbent ply is free of SAP.

The second absorbent ply advantageously brings about greater wearing comfort, in particular in the case of an incontinence article in contact with the body, since a softer haptic impression of the incontinence article is achieved from the backsheet side. To this end, the second absorbent ply contains less SAP or none. It is moreover known to a person skilled in the art that particulate material can exert abrasive forces which can damage the substantially liquid-impermeable backsheet, in particular a liquid-impermeable backsheet film, of the absorbent article and can lead to leakage from the article. Therefore, the second absorbent ply also offers the advantage that the risk of damaging the backsheet film in the production process or during use of the incontinence article is reduced.

It has been found to be advantageous if the pH regulator is particulate. Preferably, at least 50 percent by weight of the pH regulator has a particle size of 10 to 2000 pm, in particular of 50 to 1200 pm, further in particular of 80 to 800 pm. In principle, pH regulators having a smaller or larger particle size are also available and usable.

However, the preferred particle sizes offer the advantage that particles of such a size dissolve more slowly, when wetted with bodily excretions such as a micturition fluid, than pH regulators of a smaller particle size, meaning that the pH regulator is not washed out as rapidly during use and a pH-regulating effect is preserved for longer on a topside of the incontinence article that faces the user's skin.

Moreover, a pH regulator of the preferred particle size can undergo metered addition and be incorporated into the incontinence article, in particular into the first absorbent ply, more easily than, for example, finely powdered pH regulators, particularly in high-speed machines, since there is less dust formation and associated material loss in the production process. In addition, there is a positive influence on the process-reliable arrangement of an intended amount of pH regulator in an intended target region, in particular in the front region, middle region and rear region. On the other hand, particles of this size also offer the advantage that they are haptically less perceptible during use of the incontinence article than, for example, granules of a larger particle size, thereby improving the wearing comfort of the incontinence article.

Particulate pH regulators can be mixed with the absorbent material of the first absorbent ply, i.e., be substantially arranged within the first absorbent ply. Preferably, the pH regulator is, however, on a body-side surface of the first absorbent ply. As a result, a body fluid hitting the incontinence article can come into contact with the pH regulator before it is forwarded in the absorbent ply or permanently bound therein, thereby making it possible to quicken the effect of the pH regulator.

As an alternative to a particulate pH regulator, the pH regulator can also be introduced in dissolved form, in particular as an aqueous or alcoholic solution, into the incontinence article, in particular by spraying or immersion and optionally subsequent drying of at least one absorbent ply, in particular the first absorbent ply. As a further alternative, the pH regulator can also be introduced suspension or paste into the incontinence article.

Bodily excretions such as urine typically have a more alkaline pH than the skin and can therefore lead to skin irritation or dermatitis. Therefore, pH regulators for incontinence articles for pH control of bodily excretions have been described in the prior art, such as weak acids or bases and their respective salts or combinations thereof, for example carboxylic acids such as citric acid, acetic acid, malic acid, lactic acid and/or their respective salts such as, for example, sodium salts. In principle, all substances or compositions which have a suitable buffer effect and for which there is a low risk of skin irritation are conceivable. Here, in the context of the invention, superabsorbent polymers (SAP), i.e., in particular polymers which absorb at least 15 times their weight of 0.9% by weight saline solution (measured in accordance with NWSP 242.0.R2(15)), are not to be understood as pH regulators.

The inventors have found that it is advantageous in this regard if the pH regulator comprises trisodium citrate, monosodium citrate or disodium citrate. In a preferred embodiment, the pH regulator can comprise monosodium citrate and trisodium citrate, or disodium citrate and trisodium citrate, or monosodium citrate and disodium citrate and trisodium citrate. As a result of the selection or combination of the stated components, the buffering effect of an incontinence article can be fine-tuned depending on what is striven for as regards the usage period or absorption capacity of the article, without the risk of development of highly acidic regions, as is the case when using citric acid.

If the pH regulator comprises more than one citrate, the pH regulator preferably comprises a homogeneous mixture of the respective citrates. This has the advantage that local differences in the buffering effect of the pH regulator can be avoided.

The terms monosodium citrate, disodium citrate and trisodium citrate encompass both the nonhydrogenated form and hydrates of the respective substance.

Preferably, the pH regulator consists of monosodium citrate or disodium citrate. An advantage when using monosodium citrate is, for example, that monosodium citrate is less hygroscopic than, for example, citric acid, meaning that undesired entry of moisture into the incontinence article before use can be avoided. Since monosodium citrate is less hygroscopic than, for example, citric acid, a further advantage is better pourability, meaning that metered addition of monosodium citrate can be done more easily.

In a preferred embodiment, the pH regulator consists of monosodium citrate. In a further preferred embodiment, the pH regulator consists of disodium citrate. The use of only one component as pH regulator has technical advantages, since it is not necessary to mix various components or to maintain homogeneous mixing during the production process. Moreover, a uniform buffering effect over the regions of the incontinence article that contain pH regulator is further supported.

In a preferred embodiment, the amount per unit area of pH regulator in the channel is 5 to 100 g/m 2 , in 2 particular 10 to 50 g/m , further in particular 15 to 30 g/m 2 .

In a preferred embodiment, the amount per unit area of pH regulator in a region covered by an acquisition distribution layer, which will be described in greater 2 detail below, is 5 to 100 g/m , in particular 10 to 50

g/m 2 , further in particular 15 to 30 g/m 2 .

The specified amounts of the pH regulator are to be understood to mean that they are based on an anhydrous pH regulator, for example nonhydrogenated monosodium citrate. If the pH regulator comprises one or more hydrates or, as described below, more than 5%, in particular more than 10%, additive substances, the total 2 amount of pH regulator in g/m is adjusted in such a way that the total amount of the pure and/or nonhydrogenated pH regulator present corresponds to the preferred amount above. Preferably, the monosodium citrate or disodium citrate or trisodium citrate is used substantially in pure form, in particular with a degree of purity of at least 90%, further in particular at least 95%, further in particular at least 98%, further in particular at least 99%, further in particular 100%. In particular, the monosodium citrate or disodium citrate or trisodium citrate is used at a purity meeting the requirements of the German Pharmaceutical Codex (DAC) or Commission Regulation (EU) 231/2012.

As a result, skin irritation caused by residues of other substances when using the incontinence article can be substantially avoided. However, it is also conceivable that the pH regulator comprises a small amount of one or more additive substances, for example packaging and/or conditioning agents such as release agents, stabilizers, dust-binding agents, anticaking agents, wetting agents, coagulants, anticoagulants, adhesive or surface-active substances or antimicrobial substances, dyes or fragrances, or pH indicators. In such a case, the proportion of the one or more other substances, based on the total amount of pH regulator, is altogether preferably less than 10%, further preferably less than 5%, further preferably less than 2%, further preferably less than 1%.

In a preferred embodiment, the first absorbent ply in the first region comprises at least a partial amount of the pH regulator. As a result, especially when a large amount of liquid hits that cannot be immediately absorbed into the absorption body, in particular into the channel, at the point or region of impact, a body fluid can advantageously also be subjected to pH regulation in the surrounding first region of the first absorbent ply.

Preferably, the incontinence article comprises at least one acquisition distribution layer (ADL) which is arranged between the topsheet and the first absorbent ply and wherein the ADL covers the channel regionally, in particular completely. As a result, body fluids such as urine can be rapidly absorbed, distributed and forwarded to the first absorbent ply and/or into the channel.

Preferably, the middle region of the first absorbent ply can be located in the orthogonal projection below the ADL. As a result, the absorbed body fluid is advantageously forwarded to the pH regulator-comprising middle region in particular during use, and rapid pH regulation is made possible. According to one variant of the invention, the front region and/or the rear region of the absorption body can be likewise located in the orthogonal projection below the ADL, completely or sectionally. Further preferably, the middle region and/or the front region and/or the rear region can each be located circularly, in particular with a diameter of 2.5 cm, in the orthogonal projection.

Acquisition distribution layers are already known in the technical field and typically consist of a fibrous material, in particular a nonwoven material.

The fibers can be natural or synthetic in origin and can be of a defined length (staple fibers) or be continuous or be formed in situ. The fibers can be formed from a single polymer or polymer blend (single-component fiber) or from more than one single polymer and/or polymer blend (multicomponent fiber). A multicomponent fiber has a cross-section which comprises more than one single section, each of these sections comprising a different polymer or different polymer blend. The term multicomponent fiber encompasses, but is not limited to, a bicomponent fiber. The various components of multicomponent fibers are arranged over the cross-section of the fiber in substantially different regions and extend continuously over the length of the fiber. A multicomponent fiber can have an overall cross section which comprises subregions of the two or more different components of any shape or arrangement, including, for example, coaxial subsections, core-and sheath subsections, side-by-side subsections, radial subsections, insular subsections, etc. A bicomponent fiber having a "core/sheath structure" has a cross-section which comprises the following: two discrete sections, each of which consists of a polymer or polymer blend, wherein the sheath polymer or the sheath polymer-blend component is arranged around the core polymer or the core polymer-blend component. The basis weight of nonwoven materials is generally specified in grams per square meter (g/m 2 ).

In a preferred embodiment, the acquisition distribution layer comprises multicomponent fibers, in particular bicomponent fibers, further in particular polyester comprising bicomponent fibers, so-called Bico/PES fibers. The multicomponent fibers, in particular the bicomponent fibers, preferably have a circular or trilobate cross-section. Preferred combinations of components in bicomponent fibers are polyethylene terephthalate (PET)/polyethylene

(PE), PET/polypropylene (PP), PET/polyester copolymers (CoPET), polylactic acid (PLA)/polylactide copolymers (COPLA), PLA/PE and PLA /PP. As an alternative, it is known in the technical field to use a material made from chemically modified cellulose fibers, for example cross-linked cellulose fibers, as ADL. The acquisition distribution layer can also comprise or consist of other materials such as perforated films or foams or the like.

The acquisition distribution layer can substantially completely or only partially cover the absorption body, and can thus have substantially the same planar extent or an at least regionally smaller extent than the first absorbent ply and/or the second absorbent ply of the absorption body in the longitudinal and/or transverse direction of the incontinence article resting flat. Preferably, the acquisition distribution layer covers the first absorbent ply and/or the second absorbent ply of the absorption body to an extent of 5-100%, in particular to an extent of 10-90%, further in particular to an extent of 15-80%, further in particular to an extent of 15-70% of the planar extent thereof. Preferably, the acquisition distribution layer is arranged at least in a region in which the micturition liquid hits the incontinence article during use. In particular, the acquisition distribution layer extends over and in the region of a transverse central axis of the absorption body.

In a preferred embodiment, the pH regulator is substantially arranged between the acquisition distribution layer and the first absorbent ply. In particular, at least 50 percent by weight, in particular at least 60 percent by weight, further in particular 70 percent by weight, further in particular at least 80 percent by weight of the pH regulator are arranged between the acquisition distribution layer and the first absorbent ply.

This advantageously results in absorbed body fluids coming into contact with the pH regulator just after passing through the acquisition distribution layer and in rapid regulation of pH being possible.

The total amount of pH regulator per incontinence article, which is particularly intended for use by adults, is preferably 0.20 to 3.00 g, further preferably 0.30 to 2.50 g, further preferably 0.40 to 2.00 g, further preferably 0.50 to 1.50 g, further preferably 0.50 to 1.00 g, further preferably 0.50 to 0.80 g.

In a preferred embodiment, the incontinence article maintains a skin-friendly pH over at least two, in particular at least three, micturition events. As a result, wearing comfort is improved even over a prolonged period of use such as, for example, during sleep.

Further preferably, the pH on a topside of the incontinence article that faces the skin is a value of 4.0-6.5, in particular 4.2-6.2, further in particular 4.3-6.0, further in particular 4.5-5.8, further in particular 4.7-5.7.

In a further preferred embodiment, the channel of the first absorbent ply is substantially free of SAP. This offers the advantage that the body fluid absorbed into the channel is not prematurely permanently bound in the channel, but can be forwarded unimpeded along the channel and thereby distributed more uniformly in the absorption body. In particular, premature binding of the absorbed body fluid by means of SAP in the channel can impede or at least delay pH regulation of the body fluid.

Preferably, the second absorbent ply comprises less than 20 percent by weight, in particular less than 15 percent by weight, further in particular less than 10 percent by weight, further in particular less than 5 percent by weight of the pH regulator. Further in particular, the second absorbent ply is free of pH regulator. As a result, greater wearing comfort is advantageously achieved, in particular in the case of an incontinence article in contact with the body, since a softer haptic impression of the incontinence article is achieved from the backsheet side. As described above, particulate material can exert abrasive forces which can damage the substantially liquid-impermeable backsheet, in particular a liquid-impermeable backsheet film, of the absorbent article and can lead to leakage from the article. Therefore, a further advantage is that the risk of damaging the backsheet film in the production process or during use of the incontinence article is reduced.

The incontinence article can be different embodiments such as, for example, incontinence pads, incontinence liners, panty liners, open-type incontinence diapers, closed-type incontinence diapers or else bed pads. Depending on the type or embodiment, the incontinence article can comprise one or more further features that are well known in the prior art, such as, for example, side parts, closure systems, wings, elastications, leak protection systems (e.g., cuffs), wetness indicators, labeling means, skin-care or odor-regulation substances or compositions, fasteners (e.g., adhesive, hook) and also other features that are known or appear appropriate to a person skilled in the art.

Further features, details and advantages of the invention will become apparent from the accompanying claims and from the graphic depiction and following description of preferred embodiments of the invention and examples. In the drawing:

Figure la shows a schematic depiction of an incontinence article in plan view

Figure lb shows a schematic depiction of an incontinence article analogous to Figure la, additionally comprising ADL and channel, in plan view

Figure 2a shows schematically a cross-section through an incontinence article comprising a first absorbent ply, ADL and pH regulator

Figure 2b shows schematically a cross-section through an incontinence article comprising a first absorbent ply containing SAP, and a second absorbent ply, an ADL and pH regulator

Figure 3a shows schematically a cross-section through an incontinence article analogous to Figure lb, comprising a first absorbent ply and channel

Figure 3b shows schematically a cross-section through an incontinence article analogous to Figure 3a, comprising a first absorbent ply and an additional second absorbent ply and channel

Figure 4 shows a schematic depiction of an open-type incontinence diaper with closure elements in plan view

Figure la shows schematically, but not to scale, an incontinence article la according to the invention comprising an at least regionally liquid-permeable topsheet 2, a substantially liquid-impermeable backsheet 3, and an absorption body 4 arranged between the topsheet 2 and the backsheet 3, wherein the absorption body 4 has a transverse central axis QMA, a longitudinal central axis LMA and a first absorbent ply 5. The first absorbent ply 5 comprises a pH regulator 7, for example particulate monosodium citrate or trisodium citrate or disodium citrate, depicted here as dots. The pH regulator 7 is nonuniformly introduced into the first absorbent ply 5, so that a middle region B of the absorption body 4 and a front region A of the absorption body 4 and a rear region C of the absorption body 4 contain pH regulator 7 such that an amount per unit area of the pH regulator 7 is, in g/m 2 , greater in the middle region B of the absorption body 4 than in the front region A and/or the rear region C of the absorption body 4 (schematically illustrated in Figure la by a higher number and density of the dotted pH regulator 7 in the middle region B).

The absorption body 4 has a front transverse edge 4a that comes to rest on the ventral side during use and a rear transverse edge 4b that comes to rest on the dorsal side during use, both of which extend in a transverse direction 10 of the absorption body, which corresponds here to a transverse direction of the incontinence article. Here, the profile of the front transverse edge 4a and the rear transverse edge 4b of the absorption body 4 is regionally straight. Alternatively, the profile of the front transverse edge 4a and/or the rear transverse edge 4b of the absorption body can also be completely straight, angular, curved, arcuate, undulating or can be any other line that appears suitable to a person skilled in the art.

A front region A, middle region B and rear region C can be located on the longitudinal central axis LMA of the absorption body 4. A front region A is arranged nearer to the front transverse edge 4a of the absorption body 4 than a middle region B and a rear region C. The rear region C is arranged nearer to the rear transverse edge 4b of the absorption body 4 than the middle region B and front region A. In the example depicted, the middle region B can be located in the micturition region 9, in which body fluids such as urine are highly likely to hit the incontinence article la during use.

An amount per unit area of the pH regulator 7 is, 2 in g/m

, greater in a middle longitudinal section mLA of the absorption body 4 than in a front longitudinal section vLA and/or a rear longitudinal section hLA of the absorption body 4. The length of the middle longitudinal section mLA can be 30-65% of a total longitudinal extent L of the absorption body. Figure la illustrates merely by way of example the location of a middle longitudinal section mLA having a length of 43% of the total longitudinal extent L of the absorption body. In this example, both any middle longitudinal section mLA of the absorption body 4 and any front longitudinal section vLA and any rear longitudinal section hLA of the absorption body 4 comprise pH regulator 7. In this example, the pH regulator 7 is arranged on both sides of the longitudinal central axis LMA of the absorption body 4, in a region 12 of the absorption body 4 that is central in the transverse direction 10, wherein regions 13 of the absorption body 4 that are peripheral in the transverse direction 10 are free of pH regulator 7. As a result, the pH regulator 7 is focused where body fluids typically primarily hit the incontinence article la, namely in the central region 12. The pH regulator 7 is also arranged in the micturition region 9 (also referred to as micturition point), in which a micturition liquid is highly likely to hit the incontinence article la during use. However, it is also possible to arrange the pH regulator 7 both in the central region 12 and in the peripheral regions 13. In this preferred embodiment, the front longitudinal section vLA and the rear longitudinal section hLA of the absorption body 4 do not comprise pH regulator 7 in partial sections 17,18 that adjoin the front transverse edge 4a or rear transverse edge 4b. In an alternative embodiment, the pH regulator 7 can, however, be arranged over the entire longitudinal extent L of the absorption body 4. In a further alternative embodiment, the pH regulator 7 can be arranged only within the middle longitudinal section mLA of the absorption body 4. In this exemplary embodiment, the absorption body 4 and a chassis 8 jointly formed by the topsheet 2 and the backsheet 3 are anatomically shaped. However, they can also be rectangular, triangular, oval, T-shaped, hourglass-shaped, anatomically shaped, asymmetrical or in any other shape that appears suitable to a person skilled in the art.

The middle longitudinal section mLA of the absorption body 4 is arranged in a crotch region 14 of the incontinence article la, thus extending over the micturition region 9, and moreover extends over the transverse central axis QMA of the absorption body 4. The middle longitudinal section mLA of the absorption body 4 is arranged symmetrically in relation to the transverse central axis QMA of the absorption body 4.

The front longitudinal section vLA of the absorption body 4 adjoins the middle longitudinal section mLA in the longitudinal direction 11 in the direction of the front transverse edge 4a of the absorption body 4 and extends up to the front transverse edge 4a of the absorption body 4. The rear longitudinal section hLA of the absorption body 4 adjoins the middle longitudinal section mLA in the longitudinal direction 11 in the direction of the rear transverse edge 4b of the absorption body 4 and extends up to the rear transverse edge 4b of the absorption body 4. The boundaries between middle longitudinal section mLA and front longitudinal section vLA and between middle longitudinal section mLA and rear longitudinal section hLA both run in a straight line in the transverse direction 10 of the incontinence article la and orthogonally to the longitudinal central axis LMA of the absorption body 4. In this preferred example, the longitudinal central axis LMA of the absorption body 4 corresponds to a longitudinal central axis of the incontinence article la and a longitudinal central axis of the first absorbent ply 5. Here, the longitudinal direction 11 of the absorption body 4 likewise corresponds to a longitudinal direction of the incontinence article la and a longitudinal direction of the first absorbent ply 5. Furthermore, the transverse central axis QMA of the absorption body 4 corresponds to a transverse central axis of the incontinence article la and a transverse central axis of the first absorbent ply 5. Here, the transverse direction 10 of the absorption body 4 likewise corresponds to a transverse direction of the incontinence article la and a transverse direction of the first absorbent ply 5.

In the example depicted, a middle region B of the absorption body 4 can be located in the middle longitudinal section mLA of the absorption body 4. A front region A of the absorption body 4 can be located in the front longitudinal section vLA of the absorption body 4. A rear region C of the absorption body 4 can be located in the rear longitudinal section hLA of the absorption body 4. In addition, a front region A' and a rear region C' of the absorption body 4 can be additionally located in the middle longitudinal section mLA of the absorption body 4.

In this preferred exemplary embodiment, the first absorbent ply 5 has the same coverage as the absorption body 4, i.e., extends just as far as the absorption body 4 in a longitudinal direction 11 of the absorption body 4 and in a transverse direction 10 of the absorption body 4. Therefore, the total longitudinal extent L of the absorption body corresponds to a total longitudinal extent of the first absorbent ply 5 and a maximum transverse extent of the first absorbent ply 5 corresponds to a maximum transverse extent of the absorption body 4. Alternatively, the first absorbent ply 5 and the absorption body 4 can differ in extent in the transverse direction 10 or longitudinal direction 11 of the absorption body.

The incontinence article depicted in Figure la can have additional optional features that are extensively described in the prior art, such as, for example, elastication means, liquid barriers (e.g., cuffs) or fastening means.

Referring to the incontinence article la in Figure la, Figure lb shows schematically, but not to scale, a further incontinence article lb which additionally comprises an acquisition distribution layer (ADL) 15 and a channel 16. In this exemplary embodiment, the ADL 15 has an extent in the longitudinal direction 11 of the absorption body 4 that corresponds to the longitudinal extent of the middle longitudinal section mLA. In this example, the ADL 15 covers 18% of a total area of the absorption body 4. It was found that, advantageously and simultaneously, this percentage area offers efficient liquid acquisition and distribution and is cost effective. A suitable ADL 15 can, however, cover between 5% and 100% of the total area of the absorption body 4. In this exemplary embodiment, the ADL 15 is arranged symmetrically in relation to the transverse central axis QMA of the absorption body 4. The ADL 15 can, however, also be arranged asymmetrically in relation to the transverse central axis QMA of the absorption body 4 or in relation to a transverse central axis of the incontinence article, and thus arranged closer to the front transverse edge 4a of the absorption body 4 than to the rear transverse edge 4b of the absorption body 4 or closer to the rear transverse edge 4b of the absorption body than to the front transverse edge 4a of the absorption body 4. Both the ADL 15 and the channel 16 extend over the micturition region 9. In this example, a middle region B of the absorption body 4 can be located in the orthogonal projection below the ADL 15. A front region A and a rear region C of the absorption body 4 can be located in the orthogonal projection beyond the ADL 15. In this example, the middle region B of the absorption body 4 can moreover be arranged in the region of the channel 16. In this exemplary embodiment, the amount per unit area of pH regulator 7 in the middle region B substantially corresponds to the amount per unit area of pH regulator in the channel 16.

The channel 16 is arranged parallel to and on the longitudinal central axis LMA of the absorption body 4 and the incontinence article lb. Furthermore, the channel 16 is symmetrical in relation to the longitudinal central axis LMA of the absorption body 4 and incontinence article lb. Here, advantageously, the channel 16 is centeredly arranged in the transverse direction 10 of the absorption body 4 and extends symmetrically over the transverse central axis QMA of the absorption body 4. The example shows a preferred channel 16 which is further away from the rear transverse edge 4b of the absorption body 4 than from the front transverse edge 4a of the absorption body 4. However, the channel 16 can also be arranged at the same distance away from the front transverse edge 4a and rear transverse edge 4b of the absorption body 4 or further away from the front transverse edge 4a of the absorption body 4 than from the rear transverse edge 4b of the absorption body 4.

In this example, the channel 16 is rectangular and extends in a straight line in the longitudinal direction 11 of the absorption body and incontinence article. However, also conceivable are an undulating, serrated or arcuate channel shape or any other channel shape considered appropriate by a person skilled in the art. Other different channel shapes such as, for example, meandering, bone-shaped, T-shaped, triangular, oval, star-shaped or branched are well known in the prior art. In this example, the channel 16 advantageously has a larger extent in the longitudinal direction 11 of the absorption body 4 than in the transverse direction 10. The channel 16 is completely covered by the ADL 15 and comprises a partial amount of the pH regulator 7. A body fluid conducted into the channel 16 during use can hit the pH regulator 7 rapidly. A single central channel 16 as depicted here in Figure lb has an advantageous effect on stability and shape of the incontinence article lb during use. However, it is also conceivable to provide more than one channel, in particular 2 channels.

Figure 2a shows schematically by way of example, but not to scale, a cross-section along the transverse central axis QMA of an incontinence article. In said incontinence article 1c, a middle region B of the absorption body 4 can be located on the transverse central axis QMA. The incontinence article 1c has the features depicted in Figure la. In addition, in this preferred embodiment, the incontinence article 1c comprises an acquisition distribution layer (ADL) 15.

The incontinence article 1c comprises a liquid-permeable topsheet 2, a substantially liquid-impermeable (thus during use) backsheet 3, and an absorption body 4 arranged in-between. The absorption body 4 of the incontinence article 1c comprises a first absorbent ply 5 containing fibrous material 19, such as, for example, cellulose fibers or plastic fibers, and particulate SAP 20. In the case shown, the SAP 20 is evenly distributed in the first absorbent ply 5. The ADL 15 is arranged between the first absorbent ply 5 and the topsheet 2.

In this preferred embodiment, the pH regulator 7 is arranged between the first absorbent ply 5 and the ADL 15, and thus on a surface of the first absorbent ply 5 that faces the topsheet 2. It is advantageous if body fluids penetrating from the top sheet side first hit the pH regulator 7 before they are permanently bound by SAP 20, since more effect pH control can be achieved in this way. Alternatively, the pH regulator 7 can also be arranged inside the first absorbent ply 5, uniformly or nonuniformly along the thickness direction 21 of the first absorbent ply 5.

Figure 2b shows schematically, but not to scale, a cross section along the transverse central axis QMA of a further preferred incontinence article ld. In said incontinence article ld, a middle region B of the absorption body 4 can be located on the transverse central axis QMA. The incontinence article 1c has the features depicted in Figure 2a. In addition, in this preferred embodiment, the incontinence article 1c comprises not only the acquisition distribution layer (ADL) 15, but also a second absorbent ply 6. The second absorbent ply 6 is arranged below the first absorbent ply 5, i.e., between first absorbent ply 5 and the backsheet 3. In this preferred embodiment, the second absorbent ply 6 does not comprise a SAP. Furthermore, the second absorbent ply 6 does not comprise a pH regulator 7 either. As a result, the wearing comfort of the incontinence article from the backsheet side is improved and the risk of damage to the backsheet by particles is reduced. Alternatively, small amounts of SAP and/or pH regulator can be provided in the second absorbent ply 6. The second absorbent ply 6 substantially consists of fibrous material 19, such as, for example, cellulose fibers or plastic fibers.

Figure 3a shows schematically, but not to scale, a cross section along the transverse central axis QMA of a further preferred incontinence article le. In said incontinence article le, a middle region B of the absorption body 4 can be located on the transverse central axis QMA. The incontinence article le has the features depicted in Figure 2a. In addition, in this preferred embodiment, the incontinence article le comprises not only the acquisition distribution layer (ADL) 15, but also a channel 16. In this example, the channel 16 does not completely extend through the first absorbent ply 5. The channel 16 can, for example, be formed by means of stamping or compressing of the first absorbent ply 5. The channel 16 is substantially free of absorbent materials, namely SAP 20 and fibrous material 19. Alternatively, the channel 16 can, as described in greater detail below in relation to Figure 3b, be formed as a cutout which extends through the first absorbent ply 5 in the thickness direction 21.

In this preferred embodiment, the first absorbent ply 5 comprises a single channel 16 which is arranged on a longitudinal central axis LMA of the absorption body 4. Furthermore, the channel 16 is symmetrical in relation to the longitudinal central axis LMA of the absorption body 4. The channel 16 is advantageously centeredly arranged in the transverse direction 10 of the absorption body 4.

Alternatively, the first absorbent ply can comprise more than one channel, in particular 2-5, further in particular precisely 2 channels. The first absorbent ply 5 has a first region 22 which adjoins the channel 16 and which contains the total amount of the SAP 20 of the first absorbent ply 5.

Figure 3b shows schematically, but not to scale, a cross section along the transverse central axis QMA of a further preferred incontinence article. In said incontinence article lf, the middle region B of the absorption body 4 can be located on the transverse central axis QMA. The incontinence article lf has the features depicted in Figure 3a. In addition, in this preferred embodiment, the incontinence article lf comprises not only the acquisition distribution layer (ADL) 15 and a channel 16, but also a second absorbent ply 6. The features of the second absorbent ply 6 have been described in greater detail in relation to Figure 2b. In this preferred embodiment, the channel 16 is formed as a cutout 16b which extends through the first absorbent ply 5 in the thickness direction 21. The channel 16 can also, as described in greater detail in relation to Figure 3a, be formed as a cutout 16a which extends in the first absorbent ply 5 in the thickness direction 21. As an alternative embodiment, the channel 16 can also be formed by means of stamping or compressing of the first absorbent ply 5.

In the exemplary embodiments depicted in Figures la,b, 2a,b and 3a,b, the pH regulator 7 comprises particulate monosodium citrate of the type "Fine Granular F3500" from Jungbunzlauer. This monosodium citrate has a particle size of 2 to 355 pm to an extent of 59 percent by weight and a purity of at least 99%.

In the exemplary embodiments depicted in Figures la,b, 2a,b and 3a,b, the SAP 20 is particulate. In a conceivable variant, the SAP can be fibrous or planar or foamy. The ADL 15 only partially covers the first absorbent ply 5 of the absorption body 4 and has in the present case a smaller extent than the first absorbent ply 5 (Figures 2a,b and 3a,b) and possibly the second absorbent ply 6 (Figures 2b and 3b). Alternatively, the ADL 15 can completely cover the first absorbent ply 5 and/or the second absorbent ply 6. In these cases (Figures 2b and 3b), the first absorbent ply 5 has substantially the same extent in the transverse direction 10 as the second absorbent ply 6 of the absorption body 4. The first absorbent ply 5 and the second absorbent ply 6 can, however, also have different extents. In the preferred exemplary embodiments described, the first region 22 of the first absorbent ply 5 and the second absorbent ply 6 are depicted as uniformly thick plies, i.e., having a uniform extent in the thickness direction 21. Nevertheless, the first region 22 of the first absorbent ply 5 and/or the second absorbent ply 6 can have a thickness profile.

The embodiments depicted in Figures 2a, 2b, 3a and 3b are to be understood to mean that they can have one or more further features typical of incontinence articles, in particular that they can be in the form of various types of incontinence articles, such as, for example, incontinence pads, incontinence liners, panty liners, open-type or closed-type diapers, or bed pads.

Figure 4 shows, not to scale, but schematically an incontinence article according to the invention identified as a whole by the reference sign 1g, which is by way of example an open-type incontinence diaper with closure elements in the so-called T-form for adults. The incontinence article lg comprises a chassis 8 jointly formed by the topsheet 2 and the backsheet 3 and comprising an absorption body 4 which absorbs body fluids. In this exemplary embodiment, the absorption body 4 comprises a first absorbent ply 5 which contains SAP 20 (not shown in Figure 4). The SAP 20 is uniformly distributed in the first absorbent ply 5, as already discussed in relation to Figure 2a. Optionally, the incontinence article can also comprise a second absorbent ply free of pH regulator, as described in greater detail in relation to Figure 2b where it is identified by reference sign 6, and an ADL, as described in greater detail in relation to Figures 1b, 2a,b and 3a,b where it is identified by reference sign 15.

The incontinence article lg contains a pH regulator 7, preferably comprising monosodium citrate or trisodium citrate or disodium citrate or consisting of monosodium citrate or disodium citrate, which is arranged on a topside of the first absorbent ply 5 of the absorption body 4 that faces the topsheet 2. The pH regulator 7 is nonuniformly introduced into the first absorbent ply 5, so that a middle region B of the absorption body 4 and a front region A of the absorption body 4 and a rear region C of the absorption body 4 contain pH regulator 7 such that an amount per unit area of the pH regulator 7 is, in g/m 2 , greater in the middle region B of the absorption body 4 than in the front region A and the rear region C of the absorption body 4 (illustrated by a higher number and density of the dotted pH regulator 7 in the middle region B).

The absorption body 4 has a front transverse edge 4a that comes to rest on the ventral side during use and a rear transverse edge 4b that comes to rest on the dorsal side during use, both of which extend in a transverse direction 10 of the absorption body, which corresponds here to a transverse direction of the incontinence article. Here, the profile of the front transverse edge

4a and the rear transverse edge 4b of the absorption body 4 is regionally straight. Alternatively, the profile of the front transverse edge 4a and/or the rear transverse edge 4b of the absorption body can also be completely straight, angular, curved, arcuate, undulating or can be any other line that appears suitable to a person skilled in the art.

A front region A, middle region B and rear region C can, by way of example, be located on the longitudinal central axis LMA of the absorption body 4. The front region A is arranged nearer to the front transverse edge 4a of the absorption body 4 than the middle region B and the rear region C. The rear region C is arranged nearer to the rear transverse edge 4b of the absorption body 4 than the middle region B and front region A. In the example depicted, the middle region B can be located in the micturition region 9, in which body fluids such as urine primarily hit the incontinence article la during use.

In this exemplary embodiment, the pH regulator 7 is arranged in the front longitudinal section vLA, middle longitudinal section mLA and rear longitudinal section hLA of the absorption body 4, over the entire longitudinal extent L of the absorption body 4 including in the micturition region 9. In this example, the middle longitudinal section mLA, front longitudinal section vLA and rear longitudinal section hLA of the absorption body 4 each correspond in their planar extent along the longitudinal direction 11 and transverse direction 10 of the absorption body 4 to a middle longitudinal section, front longitudinal section and rear longitudinal section of the first region 22 of the first absorbent ply 5.

In this example, the longitudinal extent of a middle longitudinal section mLA of the absorption body 4 is 62% of the total longitudinal extent L of the absorption body 4.

In this exemplary embodiment, a transverse central axis QMA1 of the incontinence article lg does not correspond to a transverse central axis QMA2 of the absorption body 4. The absorption body 4 and consequently also the transverse central axis QMA2 of the absorption body 4 are arranged nearer to a rear transverse edge 68 of the incontinence article lg than to a front transverse edge 69 of the incontinence article 1g. Alternatively, the absorption body 4 and consequently also the transverse central axis QMA2 of the absorption body 4 can be arranged at the same distance away from the front transverse edge 69 and from the rear transverse edge 68 or nearer to the front transverse edge 69 than to the rear transverse edge 69 of the incontinence article 1g. The pH regulator 7 is nonuniformly introduced into the first absorbent ply 5 such that, in the case shown, the concentration and the amount per unit area of pH 2 regulator 7 is, in g/m , greater in the middle longitudinal section mLA than in the front longitudinal section vLA and in the rear longitudinal section hLA of the absorption body 4.

Distinguishable on the incontinence article lg are a longitudinal direction 11 and a transverse direction 10 of the incontinence article 1g, the chassis 8, the absorption body 4 and the first absorbent ply 5, with the transverse direction 10 corresponding to a direction of the hip circumference of the user in a frontal region 82 and back region 64 of the chassis 8 when the incontinence article lg is in place. Arranged between the frontal region 82 and the back region 62 is a crotch region 84. Adjacently to a respective longitudinal edge 85 of the crotch region 84, the chassis 8 has an elasticated section, and thus an elasticated leg-opening section 86, in each case. In the case depicted, these elasticated leg-opening sections 86 are formed by elastic threads which run between topsheet 2 and backsheet 3 and are fixed to topsheet 2 and/or backsheet 3 in a pretensioned state and which are arcuately curved and are thus oriented at least with one component in the longitudinal direction 11 of the incontinence article 1g.

The frontal region 82 has front lateral longitudinal edges 83, and the back region 64 has rear lateral longitudinal edges 66. On this incontinence article lg in the form of a T-shaped incontinence diaper, there is provided, in the back region 64 in the transverse direction 10 on both sides, an elastic diaper side part 62,63 which extends laterally beyond the respective rear lateral longitudinal edge 66 and which, in the region of the respective rear lateral longitudinal edge 66, is undetachably attached in an overlap region 87 to the back region 64 of the chassis 8. By contrast, no diaper side parts are provided in the frontal region 82. The elastic diaper side parts 62,63 of the incontinence article lg in the form of a T-shaped incontinence diaper each have at least one closure element 44,45 in the region of their free end 88 in the transverse direction 10. The closure element 44,45 is in the form of a preferably rectangular tab and is folded onto itself by the manufacturer. In case of use, the closure element 44,45 can be opened, i.e., unfolded, in order to place the incontinence article lg on a user, with the elastic diaper side parts 62,63 being made to overlap the frontal region 82 of the chassis 8 and the closure elements 44,45 being detachably adhesively fixed to a side of the frontal region 82 of the chassis 8 that faces away from the user. In Figure 4, the elastic diaper side part 62 is unfolded and the elastic diaper side part 63 is depicted as twice folded onto itself.

In an alternative variant embodiment, the incontinence article can also be in the form of an H-shaped incontinence diaper, in which case diaper side parts are then additionally formed in the frontal region and preferably on both sides, as shown in W02005102241A1 for example. As a further variant embodiment, a closed-type incontinence diaper is also conceivable, in which case there is preferably respective attachment in the frontal region and in the back region of a stomach part and a back part, which are joined to one another at respective lateral longitudinal edges of the stomach part and back part such that the incontinence diaper is annularly closed in the direction of the hip circumference, as shown in W02013171068A1 for example. As a further variant embodiment, the incontinence article can be in the form of a bed pad or incontinence pad.

Furthermore, the incontinence article can optionally have a channel, not depicted here, which is oriented in the longitudinal direction and preferably arranged on a longitudinal central axis of the incontinence article, as described in greater detail in relation to Figures la and 3a,b, with the channel comprising at least a partial amount of the pH regulator. In such a case, the channel is completely surrounded by the first region of the first absorbent ply, with the first region comprising the total amount of the SAP of the first absorbent ply and the channel being substantially free of SAP. Alternatively, the incontinence article can also comprise more than one channel, in particular two channels.

Test method for pH measurement on the surface of an incontinence article: A urine substitute solution is used to carry out a pH measurement on the surface of an incontinence article, in particular on an outer topside of the topsheet of the incontinence article. The urine substitute solution is a 0.9% (w/v) solution of sodium chloride (NaCl) in distilled water, prepared in accordance with ISO 11984-1 (1996), that has been adjusted to pH 6.8 using sodium hydroxide (NaOH). Such a solution has long been known in the common general knowledge in the art and the preparation thereof is part of the routine methods in the technical field. The incontinence article to be tested is spread out flat with the topsheet side facing upward, completely unfolded if necessary, and fixed to a base if necessary. The test is carried out in accordance with ISO 11984-1 (1996) at a temperature of 230C ± 20C and a relative air humidity of 50% ± 5%. The incontinence article to be tested and the urine substitute liquid are preconditioned accordingly in accordance with ISO 11984-1 (1996). In order to represent a usage situation relatively realistically and to track the pH development or the buffering effect of the pH regulator over a relatively long usage period with multiple micturition events, three micturition events over a period of five hours are simulated in the course of the test as described below. Here, the incontinence article is loaded overall with a liquid volume corresponding to approximately 90% of a maximum absorption capacity of the incontinence article.

The volumes of the first and second and third simulated micturition are therefore to be chosen such that a total volume of the first and second and third simulated micturition corresponds to approximately 90% of the maximum absorption capacity of the incontinence article. At the same time, a volume of a first simulated micturition corresponds to 45% to 50% of the maximum absorption capacity of the incontinence article. A respective volume of a second and a third simulated micturition is substantially identical and corresponds in each case to 20% to 22.5% of the maximum absorption capacity. If the maximum absorption capacity of an incontinence article is unknown, the maximum absorption capacity is determined in advance in accordance with ISO 11984-1 (1996) on the basis of a second comparable incontinence article, for example an incontinence article which can be classified under the same absorbency and size and product type and optionally removed from the same packaging as the incontinence article to be tested.

A volume of the urine substitute solution corresponding to 50% of the maximum absorption capacity of the incontinence article is poured onto the dry incontinence article within 30 seconds for the purpose of simulating a first micturition, specifically in such a way that the urine substitute solution hits the incontinence article in a region in which the micturition liquid would also hit the incontinence article during a micturition event during use. If this region should not be absolutely certain, the urine substitute solution should hit the absorption body centrally, in particular in the region of a transverse central axis of the absorption body. If the incontinence article comprises an acquisition distribution layer (ADL), the urine substitute solution is poured onto the incontinence article especially centrally within a region formed by the ADL. Two hours after starting the first simulated micturition with the first volume of urine substitute solution, a second volume of urine substitute solution corresponding to 20% of the maximum absorption capacity of the incontinence article is poured onto the incontinence article, as described above, in order to simulate a second micturition. Five hours after the start of loading with the first volume of urine substitute solution, a third volume of urine substitute solution corresponding to 20% of the maximum absorption capacity of the incontinence article is poured onto the incontinence article, as described above, in order to simulate a third micturition. After each of the three simulated micturition events, the pH is measured on the outer topside of the topsheet of the incontinence article 1, 3, 5, 10, 15 and 20 min after the end of the respective simulated micturition. To this end, the pH is measured at, in each case, 4 measurement points which are spaced from one another in the longitudinal and/or transverse direction of the incontinence article spread out flat, and an average value of the four measured values is formed. If an ADL is present, the measurements should be made within the region formed by the ADL. In any case, the measurement points should be arranged within a region covered by pH regulator. The measurement points should be spaced from one another, in particular should at least not overlap with one another. It is important to ensure that the measurement points on the incontinence article are not too dry in order to obtain reliable measurement results. The positions of the 4 measurement points should preferably be retained for all measurements, but it is also possible to vary the position of one or more measurement points, for example if one measurement point should be too dry at the time of a later measurement. This may be the case, for example, for incontinence articles exhibiting particularly low rewetting, in particular 15 and/or 20 minutes after the respective simulated micturition. If at least two suitable measurement points should not be available for a measurement at a specific time, the measurement is only evaluated at whatever are the other times after the end of the respective simulated micturition. If only two or three measurement points should be available for a measurement, an average value of the two or three measured values should be formed. Owing to the routine nature of such pH measurements in the technical field, it is easily possible for a person skilled in the art to assess whether a possible measurement point is too dry. In principle, the measurement can be carried out with any measuring device judged by a person skilled in the art to be suitable for surface pH measurement. For example, the electrodes from HANNA Instruments, models HI14142 or

HI1413, are suitable. Before starting the measurement, the measuring device is calibrated according to the manufacturer's specifications.

Claims

1. An incontinence article for absorption of bodily excretions, comprising an at least regionally liquid-permeable topsheet (2), a substantially liquid-impermeable backsheet (3), and an absorption body (4) arranged between the topsheet (2) and the backsheet (3), wherein the absorption body (4) comprises a first absorbent ply (5), and wherein a pH regulator (7) is nonuniformly introduced into the first absorbent ply (5), so that a middle region of the absorption body (4) and a front region of the absorption body (4) and a rear region of the absorption body (4) contain pH regulator (7) such that an amount per unit area of the pH regulator (7) is, in g/m 2 , greater in the middle region of the absorption body (4) than in the front region and/or in the rear region of the absorption body (4).

2. The incontinence article as claimed in claim 1, characterized in that the amount per unit area of the pH regulator (7) is, in g/m 2 , greater in a middle longitudinal section of the absorption body (4) than in a front longitudinal section and/or a rear longitudinal section of the absorption body (4).

3. The incontinence article as claimed in claim 1 or 2, characterized in that 5.00-30.00 g/m 2 , in 2 particular 6.00-25.00 g/m , further in particular 7.00-20.00 g/m 2 , further in particular 8.00-15.00

g/m 2 of pH regulator (7) is arranged in the middle longitudinal section of the absorption body (4) and wherein there is arranged in the front longitudinal section and/or rear longitudinal section of the absorption body (4), in each case, 0.00-10.00 g/m 2 ,

in particular 0.10-9.00 g/m 2 , further in particular 0.20-7.00 g/m , 2 further in particular 0.30-5.00 g/m 2 of pH regulator (7).

4. The incontinence article as claimed in claim 2 or 3, characterized in that the pH regulator (7) is introduced in the first absorbent ply (5) such that the concentration of the pH regulator (7) in percent by weight is greater in the middle longitudinal section of the absorption body (4) than in the front longitudinal section and/or the rear longitudinal section of the absorption body (4).

5. The incontinence article as claimed in one or more of the preceding claims, characterized in that the first absorbent ply (5) comprises a SAP (20).

6. The incontinence article as claimed in claim 5, characterized in that the first absorbent ply (5) has a first region (22), wherein the SAP (20) is introduced in the first region (22) of the first absorbent ply (5) such that the concentration of the SAP (20) in percent by weight in a middle longitudinal section of the first region (22) of the first absorbent ply (5) is the same as in a front longitudinal section and/or a rear longitudinal section of the first region (22) of the first absorbent ply (5).

7. The incontinence article as claimed in one or more of the preceding claims, characterized in that the first absorbent ply (5) comprises a channel (16) oriented in the longitudinal direction, wherein at least a partial amount of the pH regulator (7) is introduced into the channel (16).

8. The incontinence article as claimed claim 7, characterized in that the first region (22) adjoins the channel (16) and, in particular, in that the first region (22) completely surrounds the channel (16) and wherein at least a partial amount of the

SAP (20), in particular the total amount of the SAP (20), of the first absorbent ply (5) is introduced into the first region (22).

9. The incontinence article as claimed in one or more of the preceding claims, characterized in that the absorption body (4) comprises a second absorbent ply (6), wherein the second absorbent ply (6) is arranged below the first absorbent ply (5), i.e., between first absorbent ply (5) and backsheet (3).

10. The incontinence article as claimed in claim 9, characterized in that the second absorbent ply (6) comprises less than 20 percent by weight, 15 percent by weight, 10 percent by weight, 5 percent by weight of SAP (20), and in particular is free of SAP (20).

11. The incontinence article as claimed in one or more of claims 7 to 10, characterized in that the channel (16) comprises or is formed from a cutout which extends through the first absorbent ply (5) in the thickness direction (21).

12. The incontinence article as claimed in one or more of claims 7 to 11, characterized in that the channel (16) is arranged on a longitudinal central axis of the incontinence article.

13. The incontinence article as claimed in one or more of the preceding claims, characterized in that the pH regulator (7) is particulate.

14. The incontinence article as claimed in claim 13, characterized in that at least 50 percent by weight of the pH regulator (7) has a particle size of 10 to 2000 pm, in particular of 50 to 1200 pm, further in particular of 80 to 800 pm.

15. The incontinence article as claimed in one or more of claims 7 to 14, characterized in that the amount per unit area of pH regulator (7) in the channel (16) is 5 to 100 g/m 2 , in particular 10 to 50 g/m 2

, further in particular 15 to 30 g/m 2

.

16. The incontinence article as claimed in one or more of the preceding claims, characterized in that the pH regulator (7) comprises trisodium citrate, monosodium citrate or disodium citrate.

17. The incontinence article as claimed in claim 16, wherein the pH regulator (7) consists of monosodium citrate or disodium citrate.

18. The incontinence article as claimed in one or more of claims 6 to 17, characterized in that the first absorbent ply (5) in the first region (22) comprises at least a partial amount of the pH regulator (7).

19. The incontinence article as claimed in one or more of claims 7 to 18, characterized in that the incontinence article comprises at least one acquisition distribution layer (ADL) (15) which is arranged between the topsheet (2) and the first absorbent ply (5) and wherein the ADL (15) covers the channel (16) regionally, in particular completely.

20. The incontinence article as claimed in one or more of the preceding claims, characterized in that the incontinence article maintains a skin-friendly pH over at least two, in particular at least three, micturition events.

21. The incontinence article as claimed in claim 20, characterized in that the pH on a topside of the incontinence article that faces the skin is a value of 4.0-6.5, in particular 4.2-6.2, further in particular 4.3-6.0, further in particular 4.5-5.8, further in particular 4.7-5.7.

22. The incontinence article as claimed in one or more of claims 7 to 21, characterized in that the channel (16) of the first absorbent ply (5) is substantially free of SAP (20).

23. The incontinence article as claimed in one or more of claims 9 to 22, characterized in that the second absorbent ply (6) comprises less than 20 percent by weight, in particular less than 15 percent by weight, further in particular less than 10 percent by weight, further in particular less than 5 percent by weight of the pH regulator (7) and in particular is free of pH regulator (7).