MXPA00010785A - Stabilized absorbent material for personal care products and method for making - Google Patents

Abstract

There is provided a material for personal care products having a body side layer with a basis weight of from about 10 to about 100 gsm, a density of from about 0.05 to about 0.5 g/cc and comprising synthetic fibers and binder, and a fluid retention layer having a basis weight of from about 50 to about 250 gsm, a density of from about 0.05 to about 0.5 g/cc and comprising synthetic fibers, binder and natural fibers, where a boundary between any two adjacent fibrous layers is indistinct in that fibers at or near the surfaces of such adjacent layer are significantly intermingled. The material may optionally include a fluid distribution layer and a fluid transfer layer and a garment side liner. Other optional components include superabsorbents and odor control compounds and the layers may be embossed for aesthetic and fluid control reasons.

Description

MATERIAL ABSORBENOS- STABILIZED FOR PRODUCTS FOR PERSONAL CARE AND METHOD FOR ITS MANUFACTURE FIELD OF THE INVENTION The present invention relates to a material structure in an absorbent article for personal care products such as diapers, training underpants, absorbent undergarments, adult incontinence products, bandages and hair care products. woman's hygiene.

BACKGROUND OF THE INVENTION Absorbent personal care articles include such items as diapers, training underpants, women's hygiene products such as sanitary napkins, pant liners and plugs, garments and incontinence devices, bandages and the like. . The most basic design of such articles typically includes a side-to-body liner, an outer cover and an absorbent core positioned between the body-side liner and the outer cover. Generally, the body side liner and the outer cover are sealed around the periphery as to encapsulate the absorbent core and thus make it possible to trap and retain any fluids contained within the absorbent core.

Depending on the design of the absorbent article for personal care, other components may also be included. Thus, the product may include such things as elastic side panels, fluid containment fins, fastening devices and other layers of fluid transfer or retention materials.

The previous personal care products have been constructed from materials made separately and then joined together to produce a laminate. In such cases, the boundary between the adjacent layers is relatively frizzy, often marked by the presence of an adhesive which is used to hold the layers together to produce the laminate. The separate production of each layer and the bonding adhesive together to form a laminate is a costly process that requires many different pieces of production equipment. This method of production results in a material for personal care products having a definition of frizz between each layer at the interface or boundary that can result in a decreased fluid transfer between adjacent layers.

It is an object of this invention therefore to produce a material for use in personal care products which does not require the multitude of production steps to do so. It is a further object of this invention the producing a material for personal care products in which the adjacent fibrous layers have indistinct boundaries, with entangled and mixed fibers, as to improve the transfer of fluid between the adjacent layers.

SYNTHESIS OF THE INVENTION The object of this invention is achieved by a material for personal care products having a body-to-body layer with a basis weight of from about 10 to about 100 grams per square meter, a density of from about 0.05 to about 0.5 g / cc and comprising synthetic fibers and / or a binder, and a fluid holding layer having a basis weight of from about 50 to about 250 grams per square meter, a density of from about 0.05 to about 0.5 g / cc and comprising synthetic fibers, binder and / or natural fibers, wherein a boundary between any two adjacent fibrous layers is indistinct in the sense that the fibers at or near the surfaces of such adjacent layers are between mixed significantly.

The material may optionally include a fluid distribution layer and a fluid transfer layer and a side-to-garment liner. Other optional components include superabsorbents and odor control compounds and layers may be etched for aesthetic reasons and fluid control.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows an engraving pattern or model for a personal care product which is a sinusoidal wave pattern.

Figure 2 shows an engraving pattern for a personal care product which is a shell pattern.

DEFINITIONS "Disposable" includes being discarded after use and not intended to be washed and reused.

"Front" and "back" are used throughout this description to designate the relative relationships to the garment itself, rather than to suggest any position that the garment assumes when it is placed on a wearer.

"Hydrophilic" describes the fibers or surfaces of the fibers which are wetted by the aqueous liquids in contact with the fibers. The degree of wetting of the materials can, in turn, be described in terms of the contact angles and the stresses of the surface of the liquids and materials involved. Equipment and techniques suitable for measuring the wettability of particular fiber materials can be provided by the Cahn SFA-222 Surface Force Analyzer System or by an essentially equivalent system. When measured with this system, fibers having contact angles of less than 90 degrees are designated "wettable" or hydrophilic, while fibers having contact angles equal to or greater than 90 degrees are designated as "non-humidifying" or hydrophobic.

"Interior" and "exterior" refer to the positions relative to the center of an absorbent garment, and particularly closer transversely and / or longitudinally or outwardly of the longitudinal and transverse center of the absorbent garment.

"Layer" when used in the singular may have the dual meaning of a single element or a plurality of elements.

"Liquid" means a substance not in particles and / or a material that flows and can assume the interior shape of a container inside which it is poured or placed.

"Liquid communication" means that the liquid is able to move from one layer to another layer, or from one place to another within a layer *, "Longitudinal" and "transversal" have their usual meanings. The longitudinal axis lies in the plane of the article when placed flat and fully extended and is generally parallel to the vertical plane that divides into two parts a user standing in the left and right body halves when the item is used. The transverse axis lies in the plane of the article generally perpendicular to the longitudinal axis. The article as illustrated is larger in the longitudinal direction than in the transverse direction.

The "particles", in the context of this invention, refer to any geometric shape such as, but not limited to, spherical grains, fibers or yarns, flat surfaces, surfaces roughened, the sheets, ribbons, cords, threads, or the like.

"Spray" and variations thereof include forcibly ejecting the liquid, either as a stream or such as swirling filaments, or atomized particles through a hole, nozzle or the like by means of an applied pressure of air or other gas , by the force of gravity or by centrifugal force, the spray can be continuous or not continuous.

"Conjugated fibers" refer to fibers which have been formed from at least two extruded polymers from separate extruders but spun together to form a fiber. Conjugated fibers are also sometimes referred to as multicomponent or bicomponent fibers. The polymers are usually different from one another even though the conjugated fibers can be monocomponent fibers. The polymers are arranged in different zones placed essentially constant across the cross section of the conjugated fibers and extend continuously along the length of the conjugated fibers. The configuration of such conjugated fiber can be, for example, a pod / core arrangement where one polymer is surrounded by another or can be a side-by-side arrangement, a cake arrangement, or an arrangement of "islands in the sea". Conjugated fibers are taught in U.S. Patent No. 5,108,820 issued to Kaneko et al., In U.S. Patent No. 5,336,552 issued to Strack et al., And in the United States patent. United States of America number 5,382. 00 granted to Pike and others. For the bicomponent fibers, the polymers may be present in proportions of 75/25, 50/50, 25/75 or in any other desired proportions. The fibers may also have shapes such as those described in U.S. Pat. Nos. 5,277,976 to Hogle et al. And 5,069,970 and 5,057,368 to Largman et al., Incorporated herein by reference in their entirety. which describe fibers with unconventional shapes.

The "biconstituent fibers" refers to fibers which have been formed from at least two polymers extruded from the same extruder as a mixture. The term "mixture" is defined below. The biconstituent fibers do not have the various polymer components arranged in different zones placed relatively constant across the cross-sectional area of the fiber and the various polymers are usually not continuous along the entire length of the fiber, in instead of this they usually form fibrils or protofibrils which start and end at random. Biconstituent fibers are sometimes referred to as multi-constituent fibers. Fibers of this general type are discussed in, for example, U.S. Patent No. 5,108,827 issued to Gessner. Biconstituent and bicomponent fibers are also discussed in the text of Mixtures and Polymer Compounds by John A. Manson and Leslie H. Sperling, copyright 1976 by Plenun Press, a division of Plenum Publishing Corporation, New York, IBSN 0 -306-30831-2, pages 273 to 277.

"Air placement" is a well-known process by which a fibrous non-woven layer can be formed. In the process of laying by air, bunches of small fibers having typical lengths varying from about 3 to about 19 millimeters (mm) are separated and carried in air supply and then deposited on a forming grid, usually with the assistance of a vacuum supply. The randomly deposited fibers are then bonded together using, for example, hot air or sprayed adhesive. Air placement is described in, for example, U.S. Patent Nos. 4,005,957, 4,388,056, 4,592,708, 4,598,441, 4,674,996, 4,761,258, 4,764,325, 4,904. 440, 4,908,175, and 5,004,579; the German patent DE3508344 Al; European patent application 85300626.0 and British patent application 2.191.793.

The phrase "personal care product" means diapers, underpants, absorbent underpants, adult incontinence products, bandages and products for women's hygiene.

"Women's hygiene products" means sanitary towels or pads.

The "target area" refers to the area or position of a personal care product where a discharge is normally delivered by a user.

TEST METHODS Material Caliber (thickness). The caliber of a material is a measure of thickness and is measured at 0.05 pounds per square inch with a Starret-type volume tester, in units of millimeters.

Density. The density of the materials was calculated by dividing the weight by the unit area of a sample in grams per square meter (gsm) by the volume of the sample in millimeters (mm) to 68.9 pascals and multiplying the result by 0.001 to convert the value in grams per cubic centimeter (g / cc). A total of three samples were evaluated and averaged for the density values.

DETAILED DESCRIPTION OF THE INVENTION Absorbent personal care articles include such items as diapers, training underpants, women's hygiene products such as sanitary napkins, pant liners and plugs, garments and incontinence devices, bandages and dressings. Similar. The most basic design of such articles typically includes a side-to-body liner, an outer cover and an absorbent core positioned between the body-side liner and the outer cover. Generally, the lining sideways to the body and the outer cover are salted around their peripheries as to encapsulate the and therefore make it possible to trap and retain any fluids contained within the absorbent core. Depending on the design of the absorbent article for personal personal care, other components may also be included. Therefore, the product may include such things as elastic side panels, fluid containment barriers, fastening devices and other layers of fluid transfer or retention materials.

A discussion of the materials for personal care products can be found in the jointly assigned patent application, filed on the same date of this application, under lawyer issue number 13303.10. A discussion of the methods of fabricating the materials of case 13303.10 can be found in the co-pending jointly assigned patent application, under lawyer issue number 13817.

This invention relates to a material for use in personal care products, which has been made in a manner such as to produce undifferentiated boundaries or boundaries between the adjacent fibrous layers. The previous personal care products have been constructed from materials made separately and then joined together to produce a laminate. In such cases, the boundary between the layers Adjacent fibers are relatively frizzy and distinct, often marked by the presence of an adhesive which is used to hold the layers together to produce the laminate.

The material of this invention is preferably made according to an air-laying process in which the fibers are suspended and transported in a stream of gas, preferably air, and deposited on a substrate to produce a layer. The material of this invention is made up of a number of layers which are deposited in sequence.Such deposit of materials in sequence is possible with an air placement process of multiple banks.In this process, the fibrous layers are not made separately, they stabilize individually, and are put together to produce a laminate, but they are produced one on top of the other.Although the entire material must, of course, be stabilized in some way, the individual layers of the present invention need not be so. Stabilization is achieved through the use of a binder, which, if activated thermally, obviously requires the heat treatment of the material after the fiber deposit.

The individual fibrous layers of the material of this invention have fibers which intermix and entangle with the fibers of the adjacent layer as a consequence of the air placement process. This aspect of the placement by air, and the usual absence of an adhesive between the adjacent layers, results in an interface or boundary between the adjacent layers which is not different and not frizzy but is indistinct.

The production of a material through the air placement process of multiple banks is more cost effective than producing separate layers and then joining them together to produce a laminate, thus allowing lower costs for the final consumer.

The material of this invention has a body-to-body layer, optionally a fluid transfer layer, a fluid retention layer and a side-to-side layer. The material may also have a distribution layer or other optional layers to provide specialized functions.

The side-to-body layer is sometimes referred to as a top sheet or side-to-body lining. In the direction of the thickness of the article, the lining material is the layer that is against the skin of the wearer and thus the first layer in contact with the liquid or other exudate of the wearer. The lining also serves to isolate the wearer's skin from liquids maintained in the absorbent structure and must be docile, soft-feeling and non-irritating.

The body side liner may have a basis weight, for example, ranging from about 10.0 grams per square meter (gsm) to about 100 grams per square meter, and a density of between about 0.05 grams per cubic centimeter ( g / cc) and around 0.5 grams per cubic centimeter. The body-side liner is composed of synthetic fibers and binder in a ratio of from about 90/10 to about 0/100, more particularly from about 50/50 to about 20/80 and even more particularly around 30/70. It should be noted that the binder fibers, not the liquid binder, are preferred, especially for those cases having more than 10 percent binder.

The body side liner may be surface treated with a selected amount of surfactant, such as about 0.28 percent Triton X-102 surfactant, or otherwise processed to impart the desired level of wettability and hydrophilicity. If a surfactant is used, it can be an internal additive or applied to the layer through any conventional means, such as spraying, brush coating and the like, before the deposit of the next layer.

The fluid retention layer used in this invention should absorb the liquid from the side-to-body layer adjacent in a controlled manner so that the liquid can be stored away from contact with the body. Suitable retention materials for this application should have a basis weight of from about 50 to about 250 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter. The retention material comprises binder, synthetic fibers and natural fibers. The binder must be present in an effective amount, generally between about 3 and 15 percent by weight or more particularly about 10 percent by weight. The synthetic and natural fibers, excluding the binder, can be present in a proportion of from about 0/100 to about 50/50, more particularly between about 10/90 and 20/80, and even more particularly around of 40/60. Although any of the layers of this invention may optionally contain a superabsorbent, the fluid retention layer is the most logical layer for containing such a component. This layer may contain 0 to 85 percent by weight of the superabsorbent, which should be included as a natural fiber in the calculation of the proportion of materials present.

Any number of layers can be made according to this invention, even when a particularly useful additional layer is a second retaining layer. Such a second retaining layer will be interposed between the first retaining layer and the side-to-garment lining and may contain binders in an effective amount, and excluding the binder, of about 75 percent natural fibers and about 25 percent superabsorbent fibers. As noted above, the superabsorbent should be considered a natural fiber in the calculation of the proportion of fibers in the layer, making the proportion of natural synthetic fiber in this layer 0/100, excluding the binder.

The side-to-garment lining layer, also referred to as an outer cover or lower sheet, is the layer farthest from the wearer. The outer cover has traditionally been formed of a thin thermoplastic film, such as a polyethylene film, which is essentially impermeable to liquid. The outer cover works to prevent body exudates contained in an absorbent structure from wetting or soiling the wearer's clothing, bedding, or other materials that make contact with the product for personal care. Although the outer cover may be, for example, a polyethylene film having an initial thickness of from about 0.5 mils (0.012 millimeters) to about 5.0 mils (0.12 millimeters), it is preferred that the outer cover occur as an integral part of the material of this invention. In this case, it is preferred that the garment liner or the outer cover have a basis weight of from about 10 to about 100 grams per square meter, and comprise fibers and binder in a proportion from around 50/50 to around 0/100.

The outer cover may be etched and / or matte finished to provide a more aesthetically pleasing appearance. Other alternate constructions for the outer shell include woven or nonwoven fibrous webs that may have been constructed or treated to impart the desired level of liquid impermeability., or laminates formed of a woven or nonwoven fabric and thermoplastic film. The outer cover may optionally be composed of a microporous, breathable, vapor permeable or gas permeable material, which is permeable to vapors or gas but which is essentially impermeable to liquid. The ability to breathe can be imparted to the polymer films by, for example, the use of fillers in the film polymer formula, extruding the filler / polymer formula into a film and then stretching the film sufficiently to create voids around the films. particles of the filler, thereby making the film capable of breathing. Generally, the more filler is used and the greater the degree of stretching, the greater the degree of ability to breathe. The backrests can also serve the function of a member that matches for the mechanical fasteners, in the case, for example, a non-woven fabric is the outer surface.

The optional fluid transfer layer, also referred to as the emergence layer, is more typically interposed between and in a liquid and intimate communication contact with the body-side liner and another layer such as a retaining or distribution layer. of fluid. The emergence or fluid transfer layer allows the movement of the fluid through itself generally in the Z-direction, eg outward from the side of the body and towards the side of the garment. The emergence layer is generally below the inner (unexposed) surface of the liner from side to body. It is preferred that the emergence layer have a density of between about 0.05 grams per cubic centimeter to about 0.5 grams per cubic centimeter and a basis weight of between about 10 and about 100 grams per square meter. The emergence layer can be a layer composed of synthetic fibers, binder and natural fibers wherein the binder is present in an effective amount, and excluding the binder the synthetic and natural fibers are present in a proportion of from about 40 / 60 to around 10/90.

An optional distribution layer can be interposed above (towards a user) of the fluid retention layer and must be able to move the fluid from the initial deposit point to where storage is desired. The fluid distribution layer, therefore, in addition to allowing the movement of fluid through itself in the Z-direction, it also moves the fluid in the X and Y directions. The distribution must take place at an acceptable rate so that the target insult area, usually the crotch area, is ready for the next download. The time between downloads may vary from just a few minutes to hours, generally depending on the age of the user and the product for the personal care in question. In order to achieve this transport function, a distribution layer must have a high capillary tension value. The capillary tension in the distribution materials is measured simply by the equilibrium vertical transmission of a saltwater solution of 8.5 g / 1 and should be around 15 centimeters. The transmission test is carried out by placing one end of the material vertically in the salt water solution, and waiting until the solution has reached equilibrium, and measuring the height it has reached. The materials from which the distribution layer can be made can be synthetic and natural fibers, with a small amount of binder.

Synthetic fibers include those made of nylon, polyethylene terephthalate, rayon, polyolefins such as polypropylene, Lyocel regenerated cellulose and any other suitable synthetic fibers known to those skilled in the art. Such synthetic fibers may include conjugated fibers, of biconstituent and de-polymer of short or other lengths and mixtures of such fibers with other types of fibers. Synthetic fibers may also include cosmotropes for product degradation as discussed below.

Natural fibers include cellulose, for example wood pulp, cotton pulp, etc. The pulps include the standard softwood lumber class such as Coosa Mills CR-1654 from Kimberly-Clark Corporation, the high volume additive formaldehyde free pulp (HBAFF) available from Weyerhaeuser Corporation of Tacoma, WA, and which is a southern softwood pulp fiber crosslinked with an improved wet module, and a chemically crosslinked pulp fiber such as Weyerhaeuser NHB416. The HBAFF has a chemical treatment which settles in a curl and twist, in addition to imparting dry and wet stiffness and elasticity to the fiber. Another suitable pulp is the Buckeye HP2 pulp and yet another is IP Supersoft from International Paper Company. Suitable rayon fibers are Merge 18453 1.5 denier fibers from Courtaulds Fibers Incorporated of Axis, Alabama.

Binders include fiber, liquid or other binding media which can be thermally activated.

Exemplary binders include conjugated fibers of polyolefins and / or polyamides and liquid adhesives. A suitable binder is a core / sheath conjugate fiber available from Trevira, Inc., (formerly Hoechst-celanese), from PO Box 4, Salisbury, North Carolina 28145-0004 under the designation T-255, although many suitable binder fibers are known to those skilled in the art and are They are made by many manufacturers such as Chisso and Hercules Inc. Another suitable binder fiber is Danaklon a / s, located in Engdraget 22, KD-6800 of Varde, Denmark, and it is of PE / PP conjugate fibers of 2 deniers cut into 6 mm lengths. A suitable liquid binder is the Kymene® 557LX binder available from Hercules, Inc., of Wilmington, Delaware.

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

It has become a growing concern to produce personal care products which can be "cleaned with water discharge" or which can be disposed of in a conventional toilet and which are safe for municipal or septic waste treatment systems. One method to increase the biodegradability of personal care products is to produce products which break rapidly under the conditions present in such systems. There are a number of mechanisms that produce this result, even when most are not adequate or reliable, resulting in product failure at inappropriate times or in unordered time requirements before the product breaks down.

Another mechanism that can be used to trigger degradability in water in an acceptable time frame is ion sensitivity, where the term "ion" is given in its conventional meaning of an atom or a group of molecularly bonded atoms, the which has gained or lost one or more electrons and consequently has a negative or positive electric charge. Certain polymers contain acid-based components (R-COO ") which are held together by hydrogen bonding In a dry state, these polymers remain solid In an aqueous solution which has a relatively high ion concentration, such as However, when the same polymer is subsequently exposed to larger amounts of water with a reduced ion content, such as can be found in the toilet bowl, the ion concentration will decrease and the binding of the urine to the urine will remain relatively intact. When this happens, the polymer itself will begin to break in water, materials that have these characteristics are known as cosmotropes, see for example U.S. Patent No. 4,419,403, issued to Varona. it is incorporated herein by reference in its entirety.

In a conjugated fiber, for example, the first component polymers that are stable in high ion concentration solution environments (eg baby or adult urine and menstruation fluids) may be sulfonated polyesters encoded as AQ29 , AQ38, or AQ55, as supplied by Eastman Chemical Company of Kingsport, Tennessee. The Eastman AQ38 polymer is composed of 89 percent per mole of isophthalic acid, 11 percent per mole of sodium sulfoisophthalic acid, 78 percent per mole of diethylene glycol and 22 percent per mole of 1,4-cyclohexanedimethanol. It has a nominal molecular weight of 14,000 daltons, an acid number of less than two, a hydrophilic number of less than 10, and a glass transition temperature of 38 degrees centigrade. Other examples may be mixtures of polyvinyl alcohol or polyvinyl alcohol copolymers mixed with polyacrylic or methacrylic acid, or of polyvinylmethyl ether mixed with polyacrylic or methacrylic acid. Eastman polymers are stable in high ionic solution environments, but will break rapidly in the toilet water during the draining process (excess water) thus reducing the ion concentration. Eastman polymers can be matched with a second component polymer of a higher melting temperature range such as polyethylene.

Other early component polymers that are stable at high ion concentrations include "polymers water dispersible fired. "By this it is meant that when the first component of the conjugated fiber is exposed to a trigger component, such as, for example, the sulfate ion or the chloride ion, at a first level of concentration found in the water of the normal key, the polymer that forms the first component disperses or disintegrates in no more than 30 minutes, however, when the first component of the conjugate fiber is exposed to the same trigger component at a second concentration level Superior typically found in body fluids, such as in menstrual fluids or in infant or adult urine, the polymer that forms the first component remains stable and does not disperse.The suitable examples of such a first component include water-dispersible polyester or polyamide polymers, or the copolymers, such as the copolyester polymers available from the National Strach and Chemical Company under the product identifications 70-4395 and 70-4442. Conjugated fibers having a first component comprising a dispersed water dispersible polymer are insensitive to the presence of a particular trigger component at a concentration level found in urine or menstrual fluids, but they are highly sensitive and disperse in a non-period of time. greater than 30 minutes in the presence of the same trigger component at a different lower concentration level typically found in excess toilet water, such as is found in toilet bowls. Therefore, the fibrous tissues formed of the water dispersible polymers fired or incorporating said polymers are not affected in terms of dispersibility when they receive discharges from body fluids, such as urine or menstrual fluids, but which nonetheless when discarded in the normal tap water they tend to break when the first component of the conjugate fiber disperses.

In addition, it is preferred that the entire material be etched, preferably on the lining side of the body. The engraving may be light enough to engrave only the liner from side to body or may include the optional fluid transfer and distribution layers and the fluid retention layer as well. The engraving pattern can be chosen to maximize the densification of material which improves the fluid intake and dispersion through the product, and the distribution of the fluid along the front axle to the rear. The engraving can provide visual signals to the user that the capacity of the product is approaching filling and should be discarded, and can be used to also give an aesthetic benefit. Examples of suitable etching patterns are given in the drawings. Figure 1 is an etching pattern for a personal care product mentioned as a sine wave pattern and Figure 2 is an etching pattern for a personal care product mentioned as a shell pattern.

^ ¿¿¿^ ^^ Although only a few modalities have been described in detail above-for example of this invention, those skilled in the art will readily appreciate that many modifications to example embodiments are possible without materially departing from the novel teachings and the advantages of this. invention. Therefore, all such modifications are intended to be included within the scope of this invention as defined in the following claims. In the claims, said claims of means plus function is intended to cover the structures described herein as carrying out the recited function and not only the structural equivalents but also the equivalent structures. Therefore even when a nail and a screw may not be structural equivalents in the sense that a nail employs a cylindrical surface to secure the wooden parts together, while a screw employs a helical surface, in the environment of the fastening parts of wood, a nail and a screw can be equivalent structures.

It should also be noted that any patents, applications or publications mentioned herein are incorporated by reference in their entirety.

Claims (23)

R E I V I N D I C A C I O N S

1. A material for personal care products that includes: a side-to-body layer having a basis weight of from about 10 to about 100 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter and comprising synthetic fibers and binder in a proportion of from around 90/10 to around 0/100; a fluid holding layer having a basis weight of from about 50 to about 250 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter and comprising synthetic fibers and natural fibers in a proportion of from about 0/100 to about 50/50 and a binder in an effective amount; wherein a boundary between any two adjacent fibrous layers is indistinct in the sense that the fibers at or near the surfaces of such adjacent layers are significantly intermixed.

2. The material for care products personal as it is claimed in clause 1 characterized in that it comprises a garment-side lining layer adjacent to said fluid retention layer on an outward side of the side-to-body layer, selected from the group consisting of films and a fibrous layer having a basis weight of from about 10 to about 100 grams per square meter, and comprising synthetic fibers and binder in a ratio of from about 50/50 to about 0/100.

3. The material for personal care products as claimed in clause 1 further characterized in that it comprises a fluid transfer layer interposed between said side-to-body layer and said fluid retention layer and having a basis weight of from about from 10 to about 100 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter and comprising synthetic fibers and natural fibers in a ratio of from about 40/60 to about 10/90 and binder in an effective amount.

4. The material for personal care products as claimed in clause 1 further characterized in that it comprises a fluid distribution layer adjacent to said fluid retention layer on the body side and having a vertical transmission of equilibrium of a salt water solution of 8.5 g / 1 above 15 centimeters.

5. The material as claimed in clause 1 further characterized in that it comprises an odor absorbing compound.

6. The material as claimed in clause 1 characterized in that it comprises superabsorbent particles.

7. The material as claimed in clause 1 characterized in that it comprises a peripheral seal.

8. The material as claimed in clause 1, characterized in that it also comprises an engraving pattern.

9. The material as claimed in clause 1 characterized in that at least a part of said synthetic fibers comprises a cosmotrope.

10. A material for personal care products that includes in sequence: a side-to-body layer having a basis weight of from about 10 to about 100 grams per square meter, a density of from about 0.05 to about

0. 5 grams per cubic centimeter and comprising fibers synthetics and binding fibers in a proportion of from about 50/50 to about 20/80; a fluid transfer layer having a basis weight of from about 10 to about 100 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter and comprising synthetic fibers and natural fibers in a proportion from about 40/60 to about 10/90 and a binder in an effective amount; a fluid retention layer having a basis weight of from about 50 to about 250 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter and comprising synthetic fibers and natural fibers in a proportion from about 10/90 and 20/80 and a binder in an effective amount; a side-to-garment liner layer adjacent to the fluid retention layer on the outward side of the side-to-body layer, selected from the group consisting of films and a fibrous layer having a basis weight of from about at about 100 grams per square meter and comprising synthetic fibers and binder fibers in a ratio of from about 50/50 to about 0/100; wherein a boundary between any two adjacent fibrous layers is indistinct because the fibers at or near the surfaces of such adjacent layers are significantly intermixed and wherein said product is etched with a pattern selected from the group consisting of sinusoidal waves and shells.

11. The material as claimed in clause 10 characterized in that it also comprises an odor absorbing compound.

12. The material as claimed in clause 10 characterized in that it comprises superabsorbent particles.

13. The material as claimed in clause 10 characterized in that it comprises a peripheral seal.

14. The material as claimed in clause 10, characterized in that it comprises an engraving pattern.

15. The material as claimed in clause 10 characterized in that at least a part of said synthetic fibers comprises a cosmotrope.

16. A product for personal care selected from the group consisting of diapers, underpants, underpants "absorbent interiors, adult incontinence products, bandages and products for the hygiene of women comprising the material as claimed in clause 10.

17. The personal care product as claimed in clause 16 characterized in that it is a diaper.

18. The personal care product as claimed in clause 16, characterized in that it is a training underpants.

19. The personal care product as claimed in clause 16 characterized in that it is an absorbent underpants.

20. The personal care product as claimed in clause 16, characterized in that it is a bandage.

21. The personal care product as claimed in clause 16, characterized in that it is a product for the hygiene of women.

22. The product for the hygiene of women as claimed in clause 21, characterized in that it is a sanitary napkin.

23. A material for personal care products that includes in sequence: a side-to-body layer having a basis weight of from about 10 to about 100 grams per square meter, a density of from about 0.05 to about

0. 5 g / cc and comprising synthetic fibers and binding fibers in a proportion of about 30/70; a fluid transfer layer having a basis weight of from about 10 to about 100 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter and comprising synthetic fibers and natural fibers in a ratio from about 40/60 to about 10/90 and a binder in an effective amount; a first fluid holding layer having a basis weight of from about 50 to about 250 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter and comprising synthetic fibers and natural fibers in a proportion of about 4/60 and a binder in an effective amount; a second fluid retention layer comprising natural fibers, superabsorbent fibers and binder in an effective amount; a garment-side lining layer selected from the group consisting of films and a fibrous layer having a basis weight of from about 10 to about 100 grams per square meter and comprising synthetic fibers and binding fibers in a proportion from about 50/50 to about 0/100; wherein a boundary between any two adjacent fibrous layers is indistinct in the sense that the fibers at or near the surfaces of such adjacent layers are significantly intermixed and wherein said product is etched with a pattern selected from the group consisting of waves sinusoids and shells. SUMMARY A material for personal care products having a body-to-body coating with a basis weight of from about 10 to about 100 grams per square meter, a density of from about 0.05 to about 0.5 grams per centimeter is provided. cubic and comprising synthetic fibers and binder, and a fluid holding layer having a basis weight of from about 50 to about 250 grams per square meter, a density of from about 0.05 to about 0.5 grams per cubic centimeter and comprising synthetic fibers, binding and natural fibers, wherein a boundary between any two adjacent fibrous layers is indistinct in the sense that the fibers at or near the surfaces of such adjacent layers are significantly intermixed. The material may optionally include a fluid distribution layer and a fluid transfer layer and a side-to-garment liner. Other optional components include superabsorbents and odor control compounds and the layers may be etched for aesthetic and fluid control reasons.