RU2221529C2 - Stabilized absorption material for personal hygiene facilities and a method for preparation thereof - Google Patents

Abstract

FIELD: sanitary and hygienic facilities. SUBSTANCE: invention provides personal hygiene material comprising (i) body- facing layer with surface weight from about 10 to 100 g/sq.m, density from about 0.05 to about 0.5 g/cu. cm, and containing synthetic fibers and binding material and (ii) liquid-retention layer with surface weight from about 50 to about 250 g/sq.m, density from about 0.05 to about 0.5 g/cu.cm, and synthetic fibers, binding material, and natural fibers, where border between two adjacent fibrous layers is diffuse since fibers on or near the adjacent surfaces are essentially mixed. Material optionally includes liquid- distribution layer and a layer facing object by its gap. Other optional components are absorbents and smell-controlling components. Layers can have stamping for controlling level of liquid and with a view of aesthetic. Material has a clear difference between each layer on juncture and border, which may reduce degree of transfer of liquid between adjacent surfaces. EFFECT: enhanced hygienic possibilities of material. 23 cl, 2 dwg

Description

Technical field
The invention relates to the structure of the material in an absorbent product for personal care products, such as diapers, training pants, absorbent underwear, hygiene items for adults with urinary incontinence, dressings and feminine hygiene products.

State of the art
Absorbent personal care products include items such as diapers, training pants, feminine hygiene products such as sanitary napkins, panty liners and tampons, items of clothing and devices for incontinence, dressings and the like. The simplest model of such products typically includes a layer facing the body, an outer layer and an absorbent inner layer located between the layer facing the body and the outer layer. Typically, the body-facing layer and the outer layer are sealed around the perimeter so that they seal the absorbent layer, thereby allowing it to trap and retain any liquids contained in the absorbent layer. Other components may also be included, depending on the model of the particular absorbent article. Thus, the product may contain parts such as elastic side parts, liquid localizing barriers, fasteners and other layers of liquid-transmitting or holding materials.

 Previous personal care products were constructed from materials made separately and then combined together to form a layered structure. In such cases, the boundary between adjacent layers is quite clear, often marked by the presence of an adhesive, which is used to hold the layers together, giving a layered structure. Separate preparation of each layer and gluing them together with obtaining a layered structure is an expensive technique, requiring the involvement of many different units of production equipment. This method allows you to get material for personal hygiene products, having a clear difference between each layer at the junction or border, which can lead to a decrease in the degree of fluid transfer between adjacent layers.

 Therefore, the object of this invention is to obtain material for use in personal hygiene products, which does not require many stages in its preparation. Another object of this invention is to obtain material for personal care products, in which the adjacent fibrous layers have a fuzzy border, with mixed and mixed fibers in order to improve the transfer of fluid between adjacent layers.

SUMMARY OF THE INVENTION
The object of this invention is embodied in a material for personal care products, having a layer facing the body, with a unit weight of from about 10 to about 100 g / m ² , a density of from about 0.05 to about 0.5 g / cm ³ and containing synthetic fibers and / or a binder material and a liquid retaining layer having a unit weight of from about 50 to about 250 g / m ² , a density of from about 0.05 to about 0.5 g / cm ³ and containing synthetic fibers, a binder, and / or natural fibers, where the boundary between two adjacent fibrous layers is fuzzy, since KPA located on the surfaces or near the surfaces of such adjacent layers significantly intermingled.

 The material may optionally include a liquid distribution layer and a liquid conductive layer and a layer facing the garment. Other optional components include superabsorbents and odor control compounds, and the layers can be embossed for aesthetic purposes and to control fluid levels.

Brief Description of the Drawings
Figure 1 shows the embossing pattern of a personal care product, which has the shape of a sinusoid.

 Figure 2 shows the embossing pattern of a personal care product, which has the shape of a shell.

Definitions
The term "disposable" means that products are discarded after use and cannot be washed or reused.

 The terms "front" and "back" are used in this description to indicate the location of the garment itself, more precisely to determine the position that underwear takes on the wearer.

The term "hydrophilic" refers to fibers or surfaces that are wetted by aqueous fluids that come into contact with the fibers. The degree of wetting of materials, in turn, can be described in terms such as the contact angle of the wetting and surface tension of the contacting liquids and materials. Equipment and techniques used to measure the wettability of certain fibrous materials can be represented by the Cahn SFA-222 Surface Force Analyzer System or a substantially equivalent system. When measured using this system, fibers having contact angles of less than 90 ^° are designated as “wettable” or hydrophilic, and fibers that have contact angles of contact equal to or greater than 90 ^° are referred to as “non-wettable” or hydrophobic.

 The terms “internal” or “external” refer to positions relative to the center of the absorbent article, and especially to transverse and / or longitudinally approximate or remote from the transverse and longitudinal center of the absorbent article.

 The term “layer” when used in the singular can have a double meaning as a single element or a plurality of elements.

 The term "liquid" refers to a substance and / or material not containing solid particles that flows and can take the internal shape of the vessel in which it is located or poured.

 The term "fluid transfer" means that the fluid can move from one layer to another layer or from one place to another within the same layer.

 The terms "longitudinal" and "transverse" have their usual meanings. The longitudinal axes lie in the plane of the product, which is flat and fully extended, and usually they are parallel to the vertical plane, which divides the standing consumer into the right and left halves of the body, and at the moment the product is on the consumer. The transverse axes lie in the plane of the product and are usually perpendicular to the longitudinal axes. The product in the longitudinal direction is longer than in the transverse direction.

 The term "particles" in the context of this invention refers to any geometric shapes, such as, but not limited to, spherical grains, fibers or threads, flat surfaces or rough surfaces, sheets, ribbons, ropes, threads and the like.

 The term "spray" or its variants refers to a fluid ejected with force, either in the form of a stream, or in the form of twisted fibers or atomized particles through an opening, nozzle or the like, using air pressure or another gas, using gravity or centrifugal force. The spray may be continuous or intermittent.

 The term "conjugated fibers" refers to fibers formed from at least two polymers extruded from separate extruders, but twisted together to produce one fiber. Conjugated fibers are sometimes also called multicomponent or bicomponent fibers. The polymers are usually different from each other, although conjugated fibers can be monocomponent fibers. The polymers are located in substantially permanently located defined zones across the fiber cross section and are elongated along the length of the conjugated fiber continuously. The configuration of such a conjugated fiber can be, for example, a sheath / core structure in which one polymer is surrounded by another, or a side to side structure, a pie structure, or an island in the sea structure. Conjugated fibers are described in US Pat. No. 5,108,820 to Kaneko et al., US Pat. No. 5,336,552 to Strack et al. and US Pat. No. 5,382,400 to Pike et al. In conjugated fibers, polymers may be present in ratios of 75/25, 50/50, 25/75, or in any desired ratios. The fibers may also take forms, such as described in US Pat. Nos. 5,277,976 to Hogle et al. and 5069970 and 5057368, Largman et al. , fully incorporated herein by reference, in which fibers of an unusual shape are described.

 The term "bicomponent fibers" refers to fibers that have been obtained from at least two polymers extruded from the same extruder as a mixture. The term “mixture” is defined above. The bicomponent fibers do not have different polymer components located in relatively constant defined areas across the fiber cross-section, and different polymers are usually not located along the entire length of the fiber, instead the usually obtained fibrils or protofibrils are randomly located. Binary fibers are sometimes referred to as multicomponent fibers. Fibers of this general type are also described in US Pat. No. 1,08827 by Gessner. Conjugated and bicomponent fibers are also described in Polymer Blends and Composites by John A. Manson and Leslie H. Sperling, copyright 1976 by Plenum Press, a division of Plenum Publishing Corporation of New York, ISBN 0-306-30831-1 on pages 273- 277.

 “Laying by air” is a widely known method by which a nonwoven fibrous web can be obtained. When laying with air, bundles of small fibers having a normal length of from about 3 to about 19 millimeters (mm) are separated and entrained in the supplied air stream and then applied to the forming grid, usually with a vacuum. Randomly spaced fibers are then bonded to one another using, for example, hot air or spray glue. Air-laid is described, for example, in US Pat.

 The term "personal care products" refers to diapers, training pants, absorbent underwear, hygiene products for adults suffering from urinary incontinence, dressings and feminine hygiene products.

 The term "feminine hygiene products" refers to sanitary napkins or pads.

 The term "area of exposure" refers to the area or position on the subject of personal hygiene, in which discharge from the consumer's body usually falls.

Testing Methods
Material Size (Thickness). Material size is a measure of thickness and is measured at a pressure of 0.05 psi (0.0035 kg / cm ² ) using a Starret type volume measuring instrument in millimeters.

Density. The density of the material is calculated by dividing the weight per unit area of a sample in grams per square meter (g / m ²⁾ by the volume of the sample in millimeters (mm) at 68.9 Pascals and multiplying the result by 0.001 to obtain a value in grams per cubic centimeter (g / cm ³ ). Three samples are evaluated and the arithmetic mean density is calculated.

DETAILED DESCRIPTION OF THE INVENTION
Absorbent personal care products include items such as diapers, training pants, feminine hygiene products, such as sanitary napkins, panty liners and tampons, items of clothing and devices for incontinence, dressings and so on. The simplest model of such products typically includes a layer facing the body, an outer layer and an absorbent middle layer located between the layer facing the body and the outer layer. Typically, the gasket adjacent to the body and the outer layer are sealed around the perimeter so that they seal the absorbent layer, thereby allowing it to trap and retain any liquids contained in the absorbent layer. Other components may also be included, depending on the model of the particular absorbent article. Thus, the product may include parts such as elastic side parts, liquid localizing barriers, fasteners, and other layers of liquid-transmitting or retaining materials.

 A discussion of materials for personal care products is contained in the patent application of the same applicants, with the same registration date as this application, with the patent attorney registry number 13303.10. A discussion of the methods for obtaining materials on application 13303.10 can be found in the patent application of the same applicants, which is under joint consideration, with the patent attorney registry number 13817.

 This invention is a material for use in personal hygiene products, which are produced in such a way as to obtain fuzzy borders or joints between adjacent fibrous layers. Previous personal care products were made up of materials that were obtained separately and then combined to form a layered coating. In such cases, the boundary between adjacent layers was relatively clear and defined, often marked by the presence of an adhesive that was used to hold the layers together with a layered structure.

 The material of the present invention is preferably obtained by the method of laying with air, in which the fibers are suspended and transferred to a stream of gas, preferably air, and applied to the substrate to form a layer. The material of this invention is obtained from several layers that are arranged in series. Such a consistent arrangement of materials is possible due to the use of a number of units for laying with air. In this process, the fibrous layers are not obtained separately, separately stabilized and folded together to obtain a layered structure, but obtained one on top of the other. Although all material must of course be stabilized uniformly, the individual layers of this invention do not need to be stabilized. Stabilization is carried out using a binder material, which, if activated by heat, obviously requires heat treatment of the material after applying the fibers.

 The individual fibrous layers of the material of this invention contain fibers that are mixed and mixed with the fibers of the adjacent layer when laid with air. This aspect of laying with air and the usual absence of adhesive between adjacent layers gives a boundary or joint between adjacent layers, which is not clear and defined, but rather implicit.

 Obtaining material by laying with air from a number of units is much more cost-effective than obtaining separate layers and then combining them with a layered structure, which thus reduces the cost to the end user.

 The material of the present invention has a layer facing the body, optionally a liquid conducting layer, a liquid holding layer, and a garment facing layer. The material may also include a spreading layer or other optional layers to provide specialized functions.

 A layer facing the body is sometimes referred to as a gasket facing the body or top layer. In the direction of the thickness of the product, the layer of material facing the body is a layer adjacent to the skin of the consumer, and thus is the first layer in contact with the liquid or other secretions of the consumer’s body. The layer facing the body also serves to isolate the consumer’s skin from liquids held in the absorbent structure, and therefore it must be flexible, soft and non-irritating.

The layer facing the body may have a weight per unit area, for example, from about 10.0 grams per square meter (g / m ² ) to about 100 g / m ² and a density of from about 0.05 grams per cubic centimeter (g / cm ³ ) to about 0.5 g / cm ³ . The layer facing the body contains synthetic fibers and a binder material in a ratio of from about 90/10 to about 0/100, more preferably from about 50/50 to about 20/80, and even more preferably about 30/70. It should be noted that a fibrous binder is preferable, rather than a liquid binder, especially in cases where it is contained in an amount of more than 10%.

 The surface of the body facing layer may be treated with a selected amount of surfactant, such as about 0.28% Triton X-102 surfactant, or treated in some other way to improve the desired level of wettability and hydrophilicity. If a surfactant is used, it can be an internal additive or applied to the layer by any conventional technique, such as spraying, brushing and the like, before applying the next layer.

The liquid retaining layer in this invention is to absorb liquid from a nearby layer facing the body in a controlled manner so that the liquid is stored without being in contact with the body. Suitable retaining materials for this invention should have a unit weight of from about 50 to about 250 g / m ² , density from about 0.05 to about 0.5 g / cm ³ . The retaining material contains a binder, synthetic fibers and natural fibers. Binder material should be present in an effective amount, typically from about 3 to about 15%, or, more preferably, about 10%. Synthetic and natural fibers, not considering the binder, may be present in a ratio of from about 0/100 to about 50/50, more preferably from about 10/90 to about 20/80, and most preferably about 40/60. Although any of the layers of the present invention may optionally contain a superabsorbent, the liquid retaining layer is the most suitable layer for containing it. This layer may contain from 0 to 85 wt.% Superabsorbent, which should be included as natural fibers in the calculation of the ratio of materials present.

 According to the present invention, the number of layers may be any, although a second holding layer is a particularly useful additional layer. Such a second retaining layer may be located between the first retaining layer and the layer facing the garment, and may contain a binder material in an effective amount and, without taking into account the binder, about 75% natural fibers and about 25% superabsorbent fibers. As noted above, the superabsorbent should be taken into account as natural fiber when calculating the ratio of fibers in the layer, thus, obtaining the ratio of synthetic and natural fibers in this layer 0/100, not taking into account the binder material.

The layer facing the garment, also called the back layer or the outer cover layer, is the layer farthest from the consumer’s body. The outer coating layer is traditionally made from a thermoplastic film, such as a polyethylene film, which is substantially impervious to liquid. The function of the outer cover layer is to prevent wetting or contamination of consumer clothing, bedding or other materials in contact with personal hygiene products, body excretions contained in the absorbent structure. Although the outer coating layer may be, for example, a plastic film having an initial thickness of from about 0.5 mils (0.012 millimeters) to about 5.0 mils (0.12 millimeters), it is preferable that the outer coating layer be formed as an integral part of the material of this inventions. In this case, it is preferable that the layer facing the garment or the outer cover layer has a unit weight of from about 10 to about 100 g / m ² and contains synthetic fibers and a binder in a ratio of from about 50/50 to about 0/100 .

 The outer cover layer may be embossed and / or have a matte finish to give it an aesthetically pleasing appearance. Other alternative designs for the outer cover layer include woven and non-woven fibrous webs that are prepared or processed to give the fabric the desired level of liquid impermeability, or layered materials made from woven and non-woven webs and thermoplastic films. The outer coating material may optionally be permeable to fumes or gases, a microporous “breathable” material that is permeable to fumes or gases, but substantially impermeable to liquids. Breathability can be imparted to the polymer film by, for example, using fillers in the polymer film composition, extruding the filler / polymer composition into a film and then stretching the film sufficiently to create voids around the filler particles, thereby obtaining a breathable (breathable) film. Generally, the more filler is used and the higher the degree of stretching, the greater the breathability. External coatings also serve as an interlocking part for mechanical fasteners in the case, for example, if the nonwoven fabric is an external surface.

An optional fluid transfer layer, also designated as a transmission layer, is typically located in a tight, fluid transfer contact between the body facing layer and another layer, such as a liquid distribution or retention layer. A fluid-transmitting layer or a transmission layer allows fluid to move through it usually in the Z-direction, i.e., away from the body and towards the garment. The transmission layer is usually adjacent to the inner (invisible) surface of the layer facing the body. Preferably, the transmission layer has a density of from about 0.05 g / cm ² to about 0.5 g / cm ² and a weight per unit area from about 10 to about 100 g / m ² . The transmission layer may be a layer composed of synthetic fibers, a binder material and natural fibers, where the binder material is present in an effective amount and, not taking into account the binder material, synthetic and natural fibers are present in a ratio of from about 40/60 to about 10/90.

 An optional distribution layer may be located higher (towards the consumer’s body) of the liquid holding layer and should facilitate the movement of the liquid from where it initially enters to where it is desired to be held. The fluid distribution layer therefore, in addition to moving the fluid through it in the Z-direction, promotes its progress in the X and Y directions. Distribution should be carried out at an acceptable rate so that the area of fluid entry, usually the crotch area, is ready for the next intake. The time between discharges may vary from a few minutes to hours, usually depending on the age of the consumer and the purpose of the personal hygiene item. To achieve such a transport function, the distribution layer must have a high capillary pressure. The capillary pressure in the dispensing materials is simply measured using a vertical flow equilibrium of 8.5 g / l of physiological saline, and this indicator should be above 15 cm. The flow test is carried out as follows: place the end of the material vertically in physiological saline, wait until until the solution reaches equilibrium, and measure the height at which it was reached. The materials from which the spreading layer can be obtained can be made from synthetic and natural fibers with a small amount of binder material.

 Synthetic fibers include fibers derived from polyamides, polyethylene terephthalate, cellulose hydrates, polyolefins such as polypropylene, Lyocel cellulose hydrate, and any other suitable synthetic fibers known to those skilled in the art. Such synthetic fibers may include conjugated bicomponent and homopolymer fibers of staple or other lengths and mixtures of such fibers with other types of fibers. Synthetic fibers may also include cosmotropes to decompose the product, as described below.

 Natural fibers include cellulose, for example wood pulp, cotton, and so on. Celluloses include standard fluffy softwood pulp such as Coosa Mills CR-1654 from Kimberly-Clark Corporation, formaldehyde-free volume-increasing cellulose (HBAFF) commercially available from Weyerhaeuser Corporation of Tacoma, WA, which are crosslinked cellulose fibers from southern softwood with an improved wetting coefficient, and chemically crosslinked fibers such as Weyerhaeuser NBH416. HBAFF undergoes chemical treatment, which makes the fibers twisted and twisted and, in addition, gives the fibers additional rigidity in the wet and dry state and elasticity. Another suitable pulp is Buckeye HP2 pulp, and another is IP Supersoft pulp from International Paper Corporation. Suitable hydrated cellulose fibers are Merge 18453 1.5 denier fibers from Courtaulds Fibers Incorporated of Axis, Alabama.

Binder materials include fibers, liquids, or other binders that can be activated by heat. Exemplary binders include conjugated fibers of polyolefins and / or polyamides and liquid adhesives. One suitable binder is a sheath / core conjugated fiber commercially available from Trevira Inc. (formerly Hoechst-Celanese), PO Box 4, Salisbury, NC 28145-0004 under the trade name T-255, although specialists know many other suitable binder fibers obtained by many manufacturers, such as Chisso and Hercules Inc. Another suitable binder material is commercially available from Danaklon a / s, located in Engdraget 22, KD-6800 Varde, Denmark, which is 2 mm denier conjugated 6 mm PE / PP core / sheath fibers. A suitable liquid binder is Kymene ^® 557LX, commercially available from Hercules Inc. from Wilmington, DE.

 Superabsorbents include AFA-94-21-5 from The Dow Chemical Company from Midland MI, AFA-130-53C from Dow, W77553 or Favor 870 from Stockhausen, and Sanwet IM 1500 superabsorbent from Trevira Inc.

 The issue of increased attention is the production of personal hygiene items that are “flushed (flushed)” or that can be thrown into a regular toilet and that are safe for disinfecting or municipal wastewater treatment plants. One way to increase the biodegradability of personal care products is to produce items that quickly disintegrate under the conditions available at such stations. There are many mechanisms for obtaining such a result, although most of them are not applicable or not reliable and lead to product damage at inappropriate times or to unrealistic time requirements regarding the time elapsed before the product decays.

One mechanism that can be used to initiate decomposition in water in an acceptable period of time is ion sensitivity, where the term "ion" is given in its usual meaning as an atom or a molecularly bonded group of atoms that has acquired or lost one or more electrons and, therefore, received a negative or positive charge. Certain polymers contain acidic (R-COO ^- ) components that are held together by hydrogen bonding. When dry, these polymers remain solid. In an aqueous solution that has a relatively high concentration of ions, such as urine, the polymer is still relatively intact. However, when the same polymer enters large quantities of water with a low ion content, such as may be in the toilet, the ion concentration decreases and hydrogen bonds begin to break down. As soon as this happens, the polymer itself begins to disintegrate in water. Materials having such characteristics are known as cosmotropes (see, for example, US Pat. No. 4,419,403 Varona, which is incorporated herein by reference in its entirety).

In conjugated fibers, for example, polymers of the first component that are stable in high ion concentration liquid media (for example, urine of a child or adult and menstrual flow) can be sulfonated polyesters designated AQ29, AQ38 and AQ55 from Eastman Chemical Company of Kingsport, Tennessee. The Eastman AQ 38 polymer consists of 89 mol% of isophthalic acid, 11 mol% of sodium sulfoisophthalic acid, 78 mol% of diethylene glycol and 22 mol% of 1,4-cyclohexanedimethanol. It has a nominal molecular weight of 14,000 Daltons, an acid number of less than 2, a hydroxyl number of less than 10 and a glass transition temperature of 38 ^° C. Other examples may be mixtures of poly (vinyl alcohol) or poly (vinyl alcohol) copolymers mixed with polyacrylic or methacrylic acid, or polyvinyl methyl ether mixed with polyacrylic or methacrylic acid. Eastman polymers are stable in high-ionic liquids, but they quickly disintegrate in sewer water during flushing (excess water), which reduces ion concentration. Eastman polymers can be combined with a second polymer component with a higher melting range, such as polyethylene.

 Other first polymer components that are stable at high ion concentrations include "initiated, water-dispersible polymers." This implies that when the first component of the conjugated fiber comes into contact with an initiating component, such as, for example, a sulfate ion or chloride ion, at the first concentration level found in ordinary tap water, the polymer forming the first component disperses or decomposes no more than in 30 minutes. However, when the first component of the conjugated fiber comes into contact with the same initiating component at a second, higher level of concentration typically found in body fluids, such as baby or adult urine or menstrual flow, the polymer that forms the first component remains stable and does not disperse. Suitable examples of such a first component include water dispersible polyester or polyamide polymers, such as copolyester polymers, available from National Starch and Chemical Company under the trade names 70-4395 and 70-4442. Conjugated fibers having a first component containing an initiated, water-dispersible polymer are not sensitive to the presence of a particular initiating component at a concentration level found in urine or menstrual flow, while they are very sensitive and easily dispersed over a period of not more than 30 minutes , in the presence of the same initiating component at a different, lower concentration level, usually present in excess tap water, such as in the toilet. Thus, fibrous materials obtained from or including initiating, water-dispersible polymers are not susceptible to degradability when contaminated with fluids from the body, such as urine or menstrual flow, when they enter ordinary tap water, they have a tendency to disintegrate as the first component of the conjugated fiber disperses.

 In addition, it is preferable that all the material is embossed, preferably from the side facing the body. The embossing may be small, sufficient to apply relief only to the layer facing the body, or may include an optional liquid-permeable layer and a distribution layer, and a liquid retaining layer. The embossing pattern can be chosen in such a way as to maximize the compaction of the material, which improves the penetration of the liquid and its dispersion through the product and the distribution of the liquid along the front to rear axles. Embossing can also provide visual cues to the consumer, indicating that the product is nearly complete and needs to be replaced, and embossing can be used for aesthetic purposes. Examples of suitable embossed patterns are given in the drawings. Figure 1 shows a relief pattern for a personal care product, designated as a sinusoid shape, figure 2 shows a relief pattern for a personal care product, designated as a shell shape.

 Although only a few embodiments of the present invention have been described in detail, one skilled in the art will understand that many modifications of the embodiments are possible that do not go beyond the new ideas and advantages of the present invention. Accordingly, all such modifications are included in the scope of this invention and are defined in the claims. In this claims, items related to devices and functional items encompass the structures described herein as performing the listed functions, and not only structural equivalents, but also equivalent structures. Thus, although the nail and the screw may not be structural equivalents, since the nail uses a cylindrical surface to join the wooden parts together, while the screw uses a screw surface, from the point of view of joining the wooden parts, the nail and the screw can be equivalent structures.

 Further, it should be noted that any patents, applications or publications referred to in this description are fully included in it.

Claims (23)

1. Material for personal care products, including a layer facing the body, having a unit weight of 10 to 100 g / m ² , a density of 0.05 to 0.5 g / cm ³ and containing synthetic fibers and a binder in the ratio from 90/10 to 0/100; a liquid retaining layer having an area weight of 50 to 250 g / m ² , a density of 0.05 to 0.5 g / cm ³ and containing synthetic fibers and natural fibers in a ratio of 0/100 to 50/50 and a binder in effective amount; in which the boundary between two adjacent fibrous layers is fuzzy, since the fibers on the surfaces or adjacent to such adjacent layers are substantially mixed. 2. The material for personal care products according to claim 1, additionally containing a layer facing the garment, located next to the specified layer that holds the liquid, on the side opposite to the side on which the specified layer facing the body, selected from the group including films and a fibrous layer having a weight per unit area of from 10 to 100 g / m ² and containing synthetic fibers and a binder material in a ratio of 50/50 to 0/100. 3. The material for personal care products according to claim 1, additionally containing a layer transmitting a liquid located between the specified layer facing the body and the specified layer holding the liquid, and having a weight per unit area from 10 to 100 g / m ² , density from 0.05 to 0.5 g / cm ³ and containing synthetic fibers and natural fibers in a ratio of 40/60 to 10/90 and a binder in an effective amount. 4. The material for personal care products according to claim 1, further comprising a liquid distributing layer located next to the specified layer holding the liquid from the side of the body and having a vertical flow equilibrium index of 8.5 g / l saline solution over 15 cm. 5. The material according to claim 1, further comprising an odor-absorbing compound. 6. The material according to claim 1, further comprising particles of superabsorbent. 7. The material according to claim 1, additionally sealed around the perimeter. 8. The material according to claim 1, additionally having a relief pattern. 9. The material according to claim 1, in which at least a portion of these synthetic fibers contains a cosmotrop. 10. Material for personal hygiene products, comprising in series a layer facing the body, having a weight per unit area from 10 to 100 g / m ² , density from 0.05 to 0.5 g / cm ² and containing synthetic fibers and a binder in ratio from 50/50 to 20/80; a layer transmitting a liquid having a weight per unit area from 10 to 100 g / m ² , a density of from 0.05 to 0.5 g / cm ³ and containing synthetic fibers and natural fibers in a ratio of 40/60 to 10/90 and a binder material in an effective amount; a liquid retaining layer having an area weight of 50 to 250 g / cm ² , a density of 0.05 to 0.5 g / cm ³ and containing synthetic fibers and natural fibers in a ratio of 10/90 to 20/80 and a binder material in an effective amount; a layer facing the garment, located next to the specified layer holding the liquid, on the side opposite to the side on which the specified layer facing the body, selected from the group comprising a film and a fibrous layer having a weight per unit area from 10 to 100 g / m ² and containing synthetic fibers and a binder material in a ratio of 50/50 to 0/100; in which the boundary between two adjacent fibrous layers is fuzzy, since the fibers on the surfaces or near them of such adjacent layers are substantially mixed, and where the specified product is embossed in the form of a pattern selected from the group including a sinusoid shape and a shell shape. 11. The material of claim 10, further comprising an absorbent odor of the compound. 12. The material of claim 10, further comprising particles of superabsorbent. 13. The material of claim 10, further sealed around the perimeter. 14. The material of claim 10, further having a relief pattern. 15. The material of claim 10, in which at least a portion of these synthetic fibers contains cosmotrop. 16. A personal care product selected from the group of diapers, training pants, absorbent underwear, products for incontinence, dressings and feminine hygiene products containing the material of claim 10. 17. The personal care product according to clause 16, which is a diaper. 18. The subject of personal hygiene according to clause 16, which is training pants. 19. The personal care product of claim 16, which is an absorbent underwear. 20. The personal care product of claim 16, which is a dressing. 21. The subject of personal hygiene according to clause 16, which is the subject of feminine hygiene. 22. The subject of feminine hygiene according to item 21, which is a sanitary napkin. 23. Material for personal hygiene products, including in series: a layer facing the body, having a unit weight of an area of 10 to 100 g / m ² , a density of 0.05 to 0.5 g / cm ² and containing synthetic fibers and a binder in a ratio of about 30/70; a layer transmitting a liquid having a weight per unit area from 10 to 100 g / m ² , a density of from 0.05 to 0.5 g / cm ³ and containing synthetic fibers and natural fibers in a ratio of 40/60 to 10/90 and a binder material in an effective amount; a first liquid retaining layer having an area weight of 50 to 250 g / m ² , a density of 0.05 to 0.5 g / cm ³ and containing synthetic fibers and natural fibers in a ratio of about 4/60 and a binder in an effective amount ; a second liquid holding layer containing natural fibers, superabsorbent fibers and a binder material in an effective amount; a layer facing a garment selected from the group consisting of films and a fibrous layer having a unit weight of 10 to 100 g / m ² and containing synthetic fibers and a binder in a ratio of 50/50 to 0/100; where the boundary between two adjacent fibrous layers is fuzzy, since the fibers on the surfaces or near them of such adjacent layers are substantially mixed, and where the specified product is embossed in the form of a pattern selected from the group including the shape of a sinusoid and the shape of the shell.

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