MXPA00012971A - Hygienic article comprising oil resistant, hydrophilic adhesive - Google Patents

Abstract

This application relates to hygienic articles comprising two components which are at least partially joined to each other by means of an oil resistant, hydrophilic adhesive. In particular, the adhesive has a Peel Force Reduction After Lotion Application of less than 90%and a Contact Angle with distilled water of less than 90°. In a preferred embodiment, the adhesive further has a high wet strength. The hygienic article according to the present invention exhibits sustained product integrity and fluid handling during and after contact with an oil-containing composition.

Description

HYGIENIC ARTICLE THAT COMPRISES HYDROFILIC ADHESIVE. OIL RESISTANT 1. FIELD OF THE INVENTION This application relates to hygienic articles which are intended to be used in direct contact or in close proximity to the skin of the user. More particularly, the present invention relates to hygienic articles comprising two components that are at least partially bound to one another by means of a hydrophilic, oil-resistant adhesive. 2. BACKGROUND OF THE INVENTION Hygienic articles are typically used in direct contact or in close proximity to the wearer's skin. While having a wide variety of purposes such as the absorption of body exudates (e.g., diapers), protection of the wearer's skin (e.g., wound dressings), or the like, hygienic items face some common operational requirements that result of your exposure to the user's skin. Depending on the area of the body where they are placed, hygienic items must be able to cope with different amounts of water-based liquids. Although essentially all regions of the skin transpire and evaporate water, they have to deal with much larger amounts of fluids such as body exudates. In order to be able to move the liquid away from the wearer's skin most sanitary articles comprise at least one liquid-permeable component which is placed towards the wearer's skin during the intended use.

At the same time, hygiene articles are often in contact with oil-containing compositions. These compositions may be used to protect the skin (e.g., baby creams) or may have been applied to the wearer's skin for therapeutic or cosmetic purposes. There are also hygienic items on the market which already comprise compositions containing short that will be transferred to the wearer's skin. However, the oil-containing compositions mentioned above can have detrimental effects on the integrity and liquid handling properties of the sanitary article. In addition to coating the surface that gives the user of the sanitary article with a hydrophobic layer (ie, water repellent) the protective layer can interact with the adhesives comprised in the sanitary article. Particularly, the adhesive strength of an adhesive can be substantially reduced after the adhesive has been brought into contact with the oil-containing composition. This potentially causes the reduced integrity of the absorbent article, for example, at least the partial separation of the components during use. The separation of the components, then, instead, can lead, inter alia, to an at least partial interruption of the capillary contact between the components that give the user and the remaining components of the hygienic article. This can ultimately substantially reduce the overall operation of liquid handling of the sanitary article. The integrity of the reduced product can also lead to other operating negatives such as complete separation during use, leakage of previously absorbed exudates, a less pleasant appearance of the product, and the like. Therefore, it is an object of the present invention to provide an absorbent article having a sustained product integrity and liquid handling capacity during and after contact with the oil-containing compositions.

BRIEF DESCRIPTION OF THE INVENTION It is an object of the present invention to provide an absorbent article comprising a first component that is permeable to liquid, a second component, and an adhesive by which at least part of the surface of the first component is joined at least part of the surface of the second component by means of the adhesive; the hygienic article of the invention being characterized in that the adhesive has a contact angle with the distilled water of less than 90 ° when subjected to the test of the adhesive contact angle and a reduction in the force of separation after the application of oil of less than 90%, preferably less than 70%, more preferably less than 50%, still more preferably less than 30%, even more preferable less than 10% when subjected to the strength reduction test from separation. Most preferably, the reduction of the separation force after the application of the lotion is negative, that is, the force of separation of the test sample has increased after the application of the lotion. It is a further object of the present invention to provide a sanitary article wherein the sanitary article further comprises an effective amount of a lotion coating which is capable of partially transferring to the wearer's skin. It is a further object of the present invention to provide a sanitary article wherein the sanitary article is a disposable absorbent article. Preferably, the first component of the disposable absorbent article is a topsheet, most preferably comprised of openings of at least 0.2mm2. Alternatively, the first component of the disposable absorbent article of the present invention is a fecal management member.

Still another object of the present invention is to provide a disposable absorbent article wherein the second component is an acquisition layer or an absorbent core.

DETAILED DESCRIPTION OF THE INVENTION This application relates to hygienic articles comprising two components which are at least partially bound to one another by means of an oil-resistant hydrophilic adhesive. 4. 1 Hygienic article The term "hygienic article" as used herein refers to articles that are intended to be used in contact with or in close proximity to the wearer's skin. Hygienic articles include absorbent articles such as absorbent pads, diapers, training pants, adult incontinence devices, sanitary napkins, bed pads, and the like. In addition, sanitary articles comprise articles of low or no absorbency such as wound dressings, garments (in particular undergarments), and the like. The sanitary articles of the present invention may be intended for multiple use or may be disposable. The term "disposable" is used herein to describe hygienic articles that are not intended to be washed or restored or reused in another way as a sanitary article after simple use. 4. 2 Oil Resistant Hydrophilic Adhesive In order to be able to provide product integrity and sustained fluid handling, the sanitary article of the present invention comprises a hydrophilic, oil resistant adhesive. This adhesive is deployed to at least partially join the surface of two components of the sanitary article of the present invention to one another. As used herein, the term "attached" encompasses configurations by which one component is directly secured to another component by fixing the component directly to the other component. The term "partially joined" as used herein refers to configurations in which only portions of the respective surfaces are joined together, such as being attached only at certain points, lines, areas, and the like. Preferably, the adhesive used to bond the first and second components is applied at a basis weight of at least 2 grams per square meter in those areas of the interface in which the first and second components are joined together. More preferably, the adhesive is applied at a basis weight of at least 4 grams per square meter. At least the first component of the hygienic article of the present invention must be permeable to the liquid to allow the liquid to transfer to at least part of the interface between the first component and the second component. An adhesive for the absorbent article of the present invention must satisfy requirements for at least two properties. First, the adhesive must be hydrophilic so as not to negatively affect the penetration of liquid towards at least the first component. Secondarily, the adhesive must be oil resistant in order to maintain at least part of its adhesive strength during or after contact with an oil-containing composition. Generally, contact of the adhesive with an oil-containing composition can occur on one or more of the following occasions, (i) when the adhesive is applied to a sanitary article already comprising an oil-containing composition (i.e., instantly). after applying the adhesive (ii) when an oil-containing composition is applied to a sanitary article already comprising the adhesive (immediately after applying the adhesive), (iii) during the use of the sanitary article for example when in contact with the skin treated with an oil-containing composition (ie, after the application of adhesive) An adhesive that meets the above requirements of oil resistance and hydrophilic capacity is available, for example, from Ato Findley Nederlands E .V. Roosendaal, The Netherlands, under the designation HX9275. 4. 2.1 Hydrophilic capacity The hydrophilic capacity of an adhesive can be quantified by! the measurement of the adhesive contact angle described hereinafter. In order to be suitable for the disposable absorbent article of the present invention, the adhesive must have a contact angle with distilled water of less than 90 °, preferably less than 80 °, more preferably less than 60 °, most preferably less than 40 °. 4. 2.1.1 Measurement of the contact angle The following experimental procedure is used to produce adhesive films that will be used in the measurement of the contact angle of the adhesive. (1) The adhesive is melted. The temperature at which the adhesive is heated should be chosen carefully so that the melting process has substantially no detrimental effect on the adhesive. A temperature of 160 ° has been found useful for some adhesives. (2) The adhesive is coated by groove on an uncoated paper to a thickness of approximately 0.125 millimeters. As a substrate, the uncovered side of a release paper is used. This release paper is available from 4P Rube Göttingen GmbH, Gottingen, Germany, under the designation "Rubesil HV63-473 (einseitig beschichtet)" release paper.

Also, alternative methods can be used to provide an adhesive film of substantially uniform thickness of about 0.125 millimeters. to be made in accordance with the specific adhesive to be tested A method and apparatus for determining the contact angle of a drop of distilled water on a film surface (as prepared by the method outlined above) is described in FIG. U.S. Patent No. 5,268,733 An apparatus for accomplishing this measurement is commercially available from TANTEC Inc. of Schaumburg, Illinois, USA under the designation CONTACT ANGLE METER, model CAM-FILM. 4. 2.2 Resistance to oil The oil resistance of an adhesive can be quantified by the test of reduction of the strength of separation after the application of lotion described hereinafter. In order to be suitable for the absorbent article of the present invention, the adhesive must have a reduction in the separation force after lotion application of less than 80%, preferably less than 70%, preferably less than 50% , still more preferably less than 30%, still more preferably less than 10%. Most preferably, the reduction of the force to the separation after the application of the lotion is negative, that is, the force to the separation of the test sample has increased after the application of the lotion. 4. 2.2.1 Reduction of force to separation after application of the lotion The force to separation of a two-component laminate can be tested using a standard tension tester such as Zwick model 1445, available from Zwick GmbH & Co., * of Ulm, Germany, which is interconnected to a Compaq Prolinea 466 computer available from Compaq Computer Corporation of Houston / Texas, USA, using Zwick software 7047.4b which is available from Zwick GmbH & Co. of Ulm, Germany. The test of the force to the separation can be carried out under environmental conditions (ambient temperature of 20 ° C, relative humidity of 50%). The sample to be tested must be kept in the same environmental conditions for at least 24 hours before the test. The voltage tester has to be calibrated and the parameters of the machine have to be set at a constant crosshead speed of 30.5 centimeters per minute. The lower clamp of the tension tester is placed within 20 mm from the upper clamp and the displacement is set to zero. The components at one end of the laminate to be tested are separated and then placed in the two jaws of the tension tester. Finally, the two components of the sample test laminate are broken by tension by means of the voltage tester recording the respective average separation resistance over a measuring distance of at least 40 millimeters. In order to measure the reduction of the force to the separation after the application of lotion, two substantially identical samples of a laminate made from a first component, a second component (both of them being suitable for the present one) have to be prepared. invention), and the adhesive to be tested. In particular, both samples have to be substantially identical in terms of the suitable component materials (as discussed below), dimensions, application pattern of the adhesive, application pattern of the composition containing the oil (if applicable). The exact type of application of the composition containing the oil is not critical as long as it is within range as known to the skilled person for the application of the composition containing oil in sanitary articles. The force to the separation of the first sample is measured according to the previous separation strength test. A composition containing oil is applied to the outer surface of the first component of the second sample with a basis weight of at least 50 grams per square meter using the following technique. Using a blade, the oil-containing composition is distributed evenly over a polyester film (basis weight 50 grams per square meter). The surface of the film coated with the oil-containing composition is then placed in direct contact with the external surface of the first component of the second sample. A suitable composition containing oil is commercially available from Johnson & amp;Johnson Consumer Products Inc. of Skillman, New Jersey, USA, under the designation "Johnson's Diaper Rash Ointmenf'. As a replacement for this specific composition, an oil-containing composition comprising at least 50% by weight of petrolatum can be used. (mineral oil) Then, the second sample is maintained at a temperature of 37 ° C for 12 hours, the first component being on top of the second component and the film coated on top of the first component. applies a compression pressure of 5000 Pascal to the film on top of the first component during those 12 hours Finally, the force to separation of the second sample is measured according to the strength test of the previous separation. Reduction of force to separation after application of lotion is defined as the difference between force to the separation of the first sample and force to the separation of the second sample, then the difference being normalized by force to the separation of the first sample. 4. 2.3 Adhesive with high moisture resistance A In some embodiments of the present invention, it is preferred that the adhesive has a high resistance to moisture. These adhesives are particularly preferred for use in combination with fibrous components. The term "high moisture resistance adhesive" as used herein refers to an adhesive that exhibits a delayed formation of the total cohesive strength. For example, said delayed formation can be achieved by a delayed crystallization behavior after solidification. Delayed crystallization prolongs the time during which the adhesive can flow over the surface to which it is applied such as a fiber surface. Surprisingly, it has been found that when such fibrous components are used with high surface components, the use of adhesives with high moisture resistance can lead to improved separation resistance especially in the wet state of the components. The crystallization behavior can be characterized by the measurement of the viscoelastic properties of the adhesive as characterized by the storage module G 'as a function of time (see for example: Kulicke, Wemer-Michael Fließverhalten von Stoffen und Stoffgemischen, Hüthig und Wepf , Basel, Heidelberg, New York, 1986, in particular pages 88 to 93). Before the measurement the adhesive is heated above its melting point and subsequently cooled to the temperature at which the measurement is to be carried out. When the adhesive has reached that temperature, the measurement starts. A detailed description of the method and equipment for measuring the storage module of an adhesive can be found later. The time dependence of the crystallization of any thermal fusion adhesive is characterized by two phases, the initial phase when the adhesive has a low G 'and an asymptotic phase when the adhesive has a substantially constant G' (fluctuation less than 5% around of its asymptotic value). The initial phase is the extension of time during which the value of the storage module G 'is less than 50% of the storage module G' in the asymptotic phase. For the purposes of the present invention, an adhesive is considered to be an adhesive with high resistance to moisture when the duration of the initial phase is greater than 200 seconds, preferably greater than 400 seconds, more preferably greater than 600 seconds, still more preferably greater than 800 seconds, still more preferably greater than 1000 seconds, even more preferably greater than 1200 seconds, still more preferably greater than 1500 seconds, most preferably greater than 2000 seconds. In addition to having a prolonged initial phase, it is preferred when the adhesive has a low value of the storage modulus G 'at the beginning of the experiment. An adhesive that is suitable for the hygienic article of the present invention, ie, which meets the requirement of being an adhesive with high moisture resistance while also being lotion resistant and hydrophilic, is available from H.B. Fuller GmbH of Lüneburg, Germany, under the designation D875BD15. 4. 2.3.1 Testing the storage module With the storage module test, the storage module G 'of an adhesive can be tested, in particular to classify the adhesive as being an adhesive with high resistance to humidity. The storage module test G 'is carried out in a thermostat chamber at a constant temperature of 60 ° C +/- 1 ° C.

Before the measurement the adhesive is heated above its melting point. Then the adhesive is inserted into the thermostat chamber. After the adhesive has reached the temperature of the thermostat chamber (60 ° C), the measurement starts. The measurement is carried out with a standard plate / cone rheometer. The cone should have an angle of approximately 4o and the plate should have a diameter of approximately 40 millimeters. For examplesaid rheometer is available under the designation CVO Rheometer System from Bohlin Instruments Inc. of Cranbury, New Jersey, USA, or from Rheometric Scientific of Piscataway, New Jersey, USA, under the designation RDAII dynamic analyzer. Typically, the storage module is measured with a flat cone rheometer at an oscillation frequency of approximately 0.5 Hertz. 4. 2.4 Thermal Fusing Adhesives In order to enable efficient manufacture of the sanitary article of the present invention, thermal fusion adhesives are preferred for the present invention. The term "thermal fusion adhesive" as used herein refers to adhesives which they are liquefied by heating before application, then they are applied to the components in the liquid state, and solidify reversibly on cooling. 4. 3 Components In one embodiment of the sanitary article of the present invention, the first component is a topsheet. The term "topsheet" refers to a component of the sanitary article that is at least partially in contact with the skin of the wearer for at least some time of the intended use. The top sheet is at least partially bound to a second component by means of a hydrophilic, oil resistant adhesive according to the present invention. This particular embodiment of the hygienic article of the present invention has the advantage that the integrity of the sanitary article after contact with the composition containing the oil is improved compared to conventional sanitary articles. Preferably, the topsheet is at least partially attached to one. Acquisition / distribution channel as the second component. Preferably in an equal manner, the topsheet may be at least partially attached to an absorbent core as the second component. In both cases, the hydrophilic adhesive, resistant to oil, is used to increase the transfer of liquid from the upper sheet to the second component. In another embodiment of the absorbent article of the present invention, the first component is a faecal management member that is at least partially attached to the second component of the sanitary article. Preferably, the fecal management member is attached to an absorbent core as the second component. Faecal management members are particularly prone to be in contact with the composition containing the oil since they are very open to easily accept faeces.

In addition, these are placed towards a part of the user's skin to which the oil-containing composition is frequently applied. The fluid contact between the fecal management member and below the absorbent core promotes immobilization of the fecal esus within the fecal management member by dehydrating the fecal eses. 4. 3.1 Oil-Containing Composition In another embodiment of the hygienic article of the present invention, the sanitary article comprises an oil-containing composition which is capable of transferring at least partially to the wearer's skin. In the preferred embodiment of the hygienic article of the present invention, the sanitary article additionally comprises an oil-based composition which is at least capable of partially transferring to the skin of a user during the intended use. Preferably, said oil-containing composition is placed on a surface that gives the user of the hygienic article. The oil-containing composition can also be distributed in such a way that it is only released at the time of intended use such as being microencapsulated. Preferably, the oil-based compositions suitable for the hygienic article of the present invention have a melting profile such that they are relatively immobile and localized with respect to their placement within the hygienic article at room temperature, they are capable of transferring to the user at body temperature, and still not completely liquid under extreme storage conditions. Importantly, the oil-based compositions of! the present invention are easily transferable to the skin by means of normal contact, movement of the user, and / or body heat. Oil-based compositions suitable for the sanitary article of the present invention are solid, or more frequently semi-solid, at 20 ° C, that is, at ambient temperatures. By "semi-solid" it is implied that the composition based on oil has a typical rheology to pseudoplastic or plastic fluids. When no shear is applied, the oil-based compositions may have the appearance of a semi-solid but may be flowed as the shear rate increases. This is due to the fact that, although the oil-based compositions contain mainly solid components, this also includes some minor liquid components. Oil-based compositions suitable for the sanitary article of the present invention are at least semi-solid at room temperature to minimize the migration of the oil-based composition. In addition, the oil-based compositions preferably have a final melting point (100% liquid) above the "stress-subject" potential storage conditions which may be greater than 450C. Specifically, the oil-based compositions suitable for the article hygienic of the present invention should have the following melting profile: Feature Preferred range Very preferred% liquid at 2-50 3-25 temp. ambient (20 ° C)% liquid at 25-95 30-90 temp. of the body (37 ° C) final melting point (° C) > 38 > Four. Five Being solid or semi-solid at room temperature, these oil-based compositions do not have a tendency to flow and migrate into the interior of the sanitary article to which they are applied. This means that less oil-based composition is required to impart the desired therapeutic or protective coating benefits. When applied to the surface that gives the user of the sanitary article of the present invention, the oil-based compositions suitable for the sanitary article of the present invention are transferable to the user's skin through normal contact, movement of the user and / or the heat of the body. A preferred embodiment of the sanitary article of the present invention contains an effective amount of an oil-based composition. As used herein the term "effective amount of an oil-based composition coating" refers to an amount of a particular oil-based composition which, when applied to an upper diaper sheet, will be effective in satisfying its protective intent. , therapeutic, or cosmetic. Of course, the effective amount of an oil-based composition coating will depend, to an extensive extent, on the particular oil-based composition used. Oil-based compositions suitable for the sanitary article 5 of the present invention comprise: (1) an emollient or emollients; (2) an immobilizing agent or agents for the emollient; (3) optionally a surfactant or hydrophilic surfactants; and (4) other optional components. The viscosity of the formulated oil-based compositions, includes the emollient, the immobilizing agent and the optional components should be so as high as possible to prevent the oil-based composition from flowing into the interior of the sanitary article. Unfortunately, high viscosities can also lead to oil-based compositions that are difficult to apply without processing problems. Therefore, a balance must be obtained in such a way that the viscosities are sufficiently high to keep localized the compositions based on oil on the surface that gives the user of the hygienic article, but not so high to cause processing problems. Suitable viscosities for oil-based compositions will typically range from about 5 to about 200 centipoise, preferably from about 15 to about 100 centipoise, measured at 60 ° C. 4.3.1.1 Emollient The key active ingredient in these oil-based compositions is one or more emollients. As used herein, an emollient is a material that softens, makes flexible, coats, lubricates, moisturizes or cleanses the skin. An emollient typically achieves several of these objectives such as softening, moisturizing and lubricating the skin. To be suitable for use in the sanitary article of the present invention, these emollients have either a plastic or fluid consistency at 20 ° C or 20 ° C, that is, at ambient temperatures. The particular consistency of the emollient allows the oil-based composition to impart a smooth, lubricating and lotion-like feel. The emollients useful in the hygienic article of the present invention can be petroleum based, fatty acid ester type, alkyl ethoxylate type, fatty acid ester ethoxylates, fatty alcohol type, polysiloxane type, or mixtures of these emollients. Suitable oil-based emollients include those hydrocarbons or mixtures of hydrocarbons, having chain lengths of 16 to 32 carbon atoms. Oil-based hydrocarbons that have these chain lengths include mineral oil (also known as "liquid petrolatum") and petrolatum (also known as "mineral wax", "petroleum jelly" and "mineral jelly"). Mineral oil usually refers to less viscous mixtures of hydrocarbons having 16 to 20 carbon atoms. Petrolatum usually refers to more viscous mixtures of hydrocarbons having 16 to 32 carbon atoms. carbon. Petrolatum and mineral oil are particularly preferred emollients for the oil-based compositions of the present invention. 4. 3.1.2 Immobilizing Agents or Agents for the Emollient The immobilizing agent counteracts the tendency of the emollient to my 20 or flow to the hygienic article of the present invention by keeping the emollient mainly located on the surface of the sanitary article to which the emulsion is applied. oil based composition. Immobilization agents suitable for use in the sanitary article of the present invention may comprise a member selected from the group consisting of C14-C22 fatty alcohols, C12-C22 fatty acids, and C12-C22 fatty alcohol ethoxylates having an average degree of ethoxylation ranging from 2 to , and mixtures thereof. Preferred immobilizing agents include C16-C18 fatty alcohols, most preferably selected from the group consisting of cetyl alcohol, styryl alcohol, and mixtures thereof. Particularly preferred are mixtures of cetyl alcohol and styryl alcohol. Other preferred immobilizing agents include C.6-C8 fatty acids, most preferably selected from the group consisting of palmitic acid, styraric acid, and mixtures thereof. Mixtures of palmitic acid and styrene acid are particularly preferred. Still other preferred immobilizing agents include C16-C8 fatty alcohol ethoxylate having an average degree of ethoxylation ranging from about 5 to about 20. Preferably, the fatty alcohols, the fatty acids and the fatty alcohols are linear. 4. 3.1.3 Optional Surfactant or Hydrophilic Surfactants It is important that the oil-based composition is also sufficiently wettable to ensure that liquids can easily penetrate into at least the first component of the sanitary article. This decreases the likelihood that body exudates will flow out of the coating of the oil-based composition instead of being drawn into at least the first component. Depending on the particular immobilization agent used in the oil-based composition of the present invention, an additional hydrophilic surfactant (or a mixture of hydrophilic surfactants) may or may not be required to improve wettability. 4. 3.1.4 Other optional components The oil-based compositions may comprise other optional components typically present in the emollient, creams, and compositions ^ •? ß ^ ü ^^^. ^? Át ^ i ^, .-? based on oil of this type. These optional components include water, viscosity modifiers, perfumes, disinfectant antibacterial actives, pharmaceutical actives, film formers, deodorants, opacifying modifiers, astringents, solvents and the like. In addition, stabilizers 5 can be added to increase the shelf life of the oil-based composition such as cellulose derivatives, proteins and lecithin. All of these materials are well known in the art as additives to these formulations and may be employed in appropriate amounts in the oil-based compositions of the present invention. 4.4 Absorbent article A particularly preferred embodiment of the sanitary article of the present invention is the disposable absorbent article. As used herein, the term "absorbent article" refers to devices that absorb and contain exudates from the body, and more specifically, refers to devices that are placed against the user's skin to absorb and contain the various exudates discharged from the user's body. Examples of the disposable absorbent articles include feminine hygiene garments such as sanitary napkins and pantiliners, diapers, adult incontinence devices, diaper fasteners, training pants, and the like. Disposable absorbent articles typically comprise a liquid permeable topsheet, a liquid impermeable backsheet attached to the topsheet, and an absorbent core positioned between the topsheet and the backsheet. Disposable absorbent articles and their components, including the topsheet, the backsheet, the absorbent core, and any of the individual layers of these components, have a body surface and a garment surface. As used herein, "body surface" means that surface of the component article that is intended to be carried towards or adjacent to the user's body, while the "garment surface" is on the opposite side and is intended to be carried towards or positioned adjacent the wearer's body or undergarments when the disposable absorbent article is worn. The following description generally discusses the materials of the absorbent core, the topsheet and the backsheet that are useful in the disposable absorbent articles. 4. 4.1 Absorbent core In general, the absorbent core is capable of absorbing or retaining liquids (for example, menstruation, urine and / or other body exudates). The absorbent core is preferably compressible, conformable, and non-irritating to the wearer's skin. The absorbent core can be manufactured in a wide variety of sizes and shapes (eg, rectangular, oval, hourglass, "T", dog bone, asymmetric, ele). In addition to the absorbent composites of the present invention, the absorbent core can include any of a wide variety of absorbent, liquid materials commonly used in absorbent articles, such as crushed wood pulp, which is generally referred to as a felt. air. Examples of other absorbent materials suitable for use in the absorbent core include crushed cellulose wadding; meltblown polymers including coform; chemically hardened, modified or cross-linked cellulosic fibers; synthetic fibers such pleated polyester fibers, peat moss; tissue including tissue wraps and tissue laminates; absorbent foams, absorbent sponges; superabsorbent polymers; gelling absorbent materials; or any equivalent material or combinations of materials, or mixtures thereof.

The configuration and construction of the absorbent core can also be varied (for example, the absorbent core can have zones of variable gauge and / or have a profile to be thicker in the center; hydrophilic gradient; gradients of the absorbent composite of the present invention; superabsorbent gradients, or areas with lower average density and lower average basis weight, eg, acquisition zones, or may comprise one or more layers or structures). However, the total absorbent capacity of the absorbent core must be compatible with the design load and intended use of the absorbent article. In addition, the size and absorbent capacity of the absorbent core can be varied to encompass different uses such as diapers, incontinence pads, pantiliners, regular sanitary napkins, and nighttime sanitary napkins, and to encompass users ranging from babies to adults. The absorbent core may include other absorbent components that are frequently used in absorbent articles, for example, a dedusting layer, a capillary or acquisition layer, or a secondary topsheet to increase user comfort. 4. 4.2 Top sheet The top sheet is preferably docile, soft-feeling, and non-irritating to a user's skin. In addition, the top sheet is permeable to liquid, allowing liquids (eg, menstruation and / or urine) to easily penetrate through its thickness. A suitable top sheet can be manufactured from a wide range of materials such as woven and nonwoven materials (e.g., a weave of non-woven fibers); polymeric materials such as thermoplastic films formed with openings, plastic films with openings, and hydroformed thermoplastic films; porous foams; cross-linked foams; crosslinked thermoplastic films; and thermoplastic canvases. Suitable woven and nonwoven materials may be composed of natural fibers (e.g., cotton or cotton fibers), synthetic fibers (e.g., polymer fibers such as "polyester, polypropylene or polyethylene fibers) or from a combination of natural and synthetic fibers When the top sheet comprises a non-woven web, the web can be manufactured in a wide number of known techniques, for example, the web can be spun bonded, carded, wet-laid, blown in the molten, hydroentangled state, combinations of the above, or the like. 4. 4.3 Backsheet The backsheet is impervious to liquids (eg, menstruation and / or urine) and is preferably manufactured from a thin plastic film, although other flexible liquid impervious materials may also be used. As used herein, the term "flexible" refers to materials that are docile and will readily conform to the figure and general contour of the human body. The backsheet prevents the exudates absorbed and contained in the absorbent core from wetting the articles that are in contact with the absorbent article such as sheets, breeches, pajamas and undergarments. The backsheet may thus comprise a woven or non-woven material, polymeric films such as polyethylene or polypropylene thermoplastic films, or mixed materials such as a film-coated nonwoven material.

A suitable backsheet is a polyethylene film having a thickness of about 0.012 mm to about 0.051 mm. Exemplary polyethylene films are manufactured by Clopay Corporation of Cincinnati, Ohio, under the designation P18-1401 and by Tredegar Film Products of Terre Haute, Indiana, under the designation XP-39385. The backsheet is preferably finished in highlight and / or dull to provide a more fabric-like appearance. In addition, the backsheet can allow the vapors of the absorbent core to escape (ie, the backsheet is breathable) while still preventing the exudates from passing through the backsheet. The size of the backsheet is dictated by the size of the absorbent core and the exact design of the selected absorbent article. 4. 4.4 Construction The backsheet and top sheet are placed adjacent the garment surface and the body surface, respectively, of the absorbent core. The absorbent core is preferably bonded to the topsheet, backsheet, or both in any manner as is known by attachment means (not shown in Figure 3) such as those well known in the art. However, embodiments of the present invention are contemplated wherein portions of the total absorbent core are not attached to either the top sheet, the back sheet, or both. For example, the back sheet and / or the top sheet can be secured! to the absorbent core or to each other by a continuous uniform adhesive layer, a patterned adhesive layer, or an array of separate lines, spirals or spots of adhesive. The attachment means will preferably comprise a network of open-pattern adhesive filaments as disclosed in U.S. Patent No. 4,573,986, issued to Minetola, and others on March 4, 1986. An exemplary attachment means of a network of open filament pattern comprises several lines of adhesive filaments twisted in a spiral pattern as illustrated by the apparatus and method shown in United States Patent No. 3,911,173 issued to Sprague, Jr. on October 7, 1975; U.S. Patent No. 4,785,996 issued to Zwieker, and others on November 22, 1978; and in U.S. Patent No. 4,842,666 issued to Werenicz on June 27, 1989. Each of these patents is incorporated herein by reference. Alternatively, the fixing means may j * i ___ ».-- -. It is important to understand thermal junctions, pressure junctions, ultrasonic junctions, dynamic junctions or combinations of these fixation means as are known in the art. 4.4.5 Other preferable modalities S < Another advantageous embodiment of the absorbent article of the present invention are diapers. As used herein, the term "diaper" refers to an absorbent article generally worn by infants, and incontinent persons worn around the wearer's lower torso. In other words the term "diaper" includes baby diapers, training pants, adult incontinence devices, etc. The diapers of the present invention may have a number of well-known configurations, with their absorbent cores being adapted to the present invention. The exemplary configurations in the United States Patent No. 3,860,003 issued to Buell on January 14, 1975; U.S. Patent No. 5,151,092 issued to Buell et al. on September 29, 1992; and in U.S. Patent No. 5,221, 274 issued to Buell et al. on June 22, 1993. Another preferable embodiment of the present absorbent article of the invention are the training shorts. The term "training pants", as used herein, refers to disposable garments that have fixed sides and leg openings. The training pants are positioned in the user's position by inserting the user's legs into the leg openings and sliding the training pants into position around the user's lower torso. Training shorts Suitable materials are disclosed in U.S. Patent No. 5,246,433 issued to Hasse and others on September 21, 1993. ^ ttaa_x_a ._ «to * -a« _MMa_t Another preferable embodiment of the absorbent article of the present invention are the incontinence articles. Teethe "incontinence article" refers to pads, undergarments (pads held in place by a suspension system of the same type, such as a belt, or the like), inserts for absorbent articles, capacity enhancers for absorbent articles , trusses, bed pads and the like without considering whether these are worn by adults or other incontinent people. Suitable incontinence articles are disclosed in U.S. Patent No. 4,253,461 issued to Strickland, and others on March 3, 1981; U.S. Patent Nos. 4,597,760 and 4,597,761 issued to Buell; the aforementioned United States Patent No. 4,704,115, patent of the United States No. 4,909,802 issued to Ahr, and others, United States Patent No. 4,964,860 issued to Gipson, and others, October 23, 1990, and in United States Patent Application Serial No. 07 / 637,090 presented by Noel, et al. (January 3, 1991 (PCT Publication No. WO 92/11830 published July 23, 1992).

Claims (11)

1. A sanitary article comprising a first component that is permeable to liquid, and a second component, an adhesive, at least part of the surface of the first component being joined to at least part of the surface of the second component by means of the adhesive, characterized because said adhesive has: - a contact angle with the distilled water of less than 90 ° when subjected to the test of the adhesive contact angle and - a reduction of the force to the separation after the impact of the oil 10 less than 90% when the force reduction test is applied to the separator.

2. A sanitary article according to claim 1, wherein the adhesive has a reduction of the force to the separation after the impact of oil less than 70% when subjected to the test of reduction of the force to the separation.

3. A sanitary article according to claim 2, wherein the adhesive has a reduction of the force to the separation after the impact of oil of less than 50% when subjected to the test of reduction of the force to the separation.

4. A hygienic article according to claim 1 in Wherein the sanitary article further comprises an effective amount of an oil-based composition which is partially transferable to the wearer's skin.

5. A sanitary article according to any of the preceding claims, wherein the sanitary article is a disposable absorbent article.

6. A disposable absorbent article according to claim 5, wherein said first component is a topsheet.

7. A disposable absorbent article according to claim 5, wherein the second component is an acquisition layer or an absorbent core.

8. A disposable absorbent article according to claim 6, wherein the topsheet comprises openings of at least 0.2mm2.

9. A disposable absorbent article according to claim 5, wherein said first component is a fecal management member.

10. A disposable absorbent article according to claim 9, wherein said second component is an absorbent core.

11. A disposable absorbent article according to claim 1, wherein the adhesive is an adhesive with high resistance to moisture.