Absorbent composition and absorbent disposable item (options)

 

(57) Abstract:

The invention relates to a technology for production of absorbent compositions for the manufacture of disposable products actions absorbent body fluids. The absorbent composition includes either acid nabuhay in water, water-insoluble polymer having PKandbetween about 2 and about 12, or the main nabuhay in water, water-insoluble polymer having PKbbetween about 2 and about 12, and either the basic or acidic second material. The absorbent composition has the ability to slowly absorb large quantities of liquid, in particular, under external pressure. 4 C. and 26 C.p. f-crystals, 1 Il., 8 table.

The invention relates to an absorbent composition comprising an acid and a base material, and an absorbent composition demonstrates the desired absorbent properties. In particular, the present invention relates to an absorbent composition having the ability to slowly absorb large quantities of liquid, in particular, under external pressure. Absorbent composition used in absorbent products single use, such as absorbent disposable products isph in water, generally water-insoluble absorbent material, usually called superabsorbents, in absorbent products for personal use (personal hygiene) disposable known. Such absorbent materials commonly used in absorbent articles such as diapers, training pants, products for sufferers of incontinence in adults, and hygiene care products for women, to improve the absorption ability of such products, while reducing their total volume. Such absorbent materials are usually present in absorbent products in the fibrous matrix, such as matrix of a pile of wood pulp. The matrix of the pile of wood pulp typically has an absorbent capacity of approximately 6 grams of liquid per gram of hair. Super-absorbent materials typically have an absorbent capacity of at least about 10, preferably about 20, and often up to 100 times its weight in water. There is no doubt that the inclusion of such absorbent materials in the products (products) personal hygiene can reduce the total volume of such products while increasing their absorptive qualities.

Describes a wide range of substances used as absor the Gar, pectin, gums, carboxyethyl starch, and carboxyethyl cellulose, and synthetic substances, such as polyacrylates, polyacrylamides, hydrolyzed polyacrylonitrile. Although such absorbent materials based on natural materials known for use in personal care products, they have not gained wide use in such products. Absorbent materials based on natural materials has not gained wide use in personal care products, at least in part, because of their absorbent properties are usually lower compared to synthetic absorbent substances, such as sodium polyacrylate. In particular, many of the materials based on natural materials tend to form a soft, gel-like mass is swelling in the liquid. When used in absorbent products, the presence of such a soft gel-like mass tends to impede the transport of fluid within the fibrous matrix, which includes an absorbent. This phenomenon is known as the gel-blocking. When the gel-blocking further fluid cannot effectively be absorbed by the product, and the product tends to leak (flowing liquid). In addition, versaut external pressures.

In contrast, synthetic absorbent materials capable of absorbing large quantities of liquid, while maintaining the usually dense, nessisity character. Thus, synthetic absorbent materials may be incorporated into absorbent products, minimizing the likelihood of gel-blocking.

One property available now super absorbent materials is that such materials are usually very quickly absorb the liquid, which comes into contact with superabsorbers material. In WO 96/17681 described absorbent material containing anionic superabsorbent material having from 20% to 100% of the functional groups in the form of free acid groups and cationic superabsorbent material having from 20% to 100% of the functional groups in the form of a Foundation. This material can have an absorbent capacity of more than 20 g/, Despite the fact that this fast absorbing capacity of the liquid is desirable for many applications, there are some applications for which it is not desirable. For example, in an absorbent structure, which is subjected to the action of fluid only in a very localized place, geoby used absorbing capacity of the entire absorbent structure. However, if superabsorbers substance located near the localized site of the attack, absorbs liquid quickly, such superabsorbers substance may swell and block the flow of fluid through the rest of the absorbent structure, possibly leading to leakage of fluid from the absorbent structure in a localized region of the scene of the attack. As such, it is desirable to apply superabsorbers substance in the place localized action that actually absorbs liquid at a slow speed. This allows the first liquid to be distributed throughout the absorbent structure and then further absorbed slowly absorbent superabsorbers substance.

In U.S. patent 5487895 described nabuhay in water, the polymer containing a bioactive agent to control the release. Polymer substrate in contact with a liquid mixture containing a crosslinking agent, which is able to penetrate the surface of the polymer with the formation of cross-linking bridges in the polymer, thereby reducing the speed of absorption.

Some ways to slow the rate of absorption of the superabsorbent substances with relatively is absorbirovanija substance, which is nonabsorbent, and/or hydrophobic. Such covering substances tend to defend located underneath superabsorbers substance from any liquid and, thus, slow down the absorption liquid superabsorbers substance. However, such covering substances often reduce the total capacity of the liquid superabsorbent substances that increase the cost and complicate the receipt of the superabsorbent substance and may adversely affect the properties of the superabsorbent substances associated with the manipulation of other liquid.

Therefore, the aim of the present invention to provide an absorbent composition that absorbs liquid at a relatively slow speed, but with approximately the same ultimate capacity compared to commercially available synthetic superabsorbent substances.

In addition, the aim of the present invention to provide an absorbent composition that can be obtained from compounds based on natural materials, since this may reduce the total cost of obtaining an absorbent composition, and also to provide additional useful properties of the absorbent composition, that is possible is the development of absorbent composition, which can be obtained simply and with a minimum of chemicals and additives, so as to reduce the total cost of obtaining an absorbent composition, and to reduce the potential harmful effects that such additives can have on the total absorbent properties of the absorbent composition.

Also the aim of the present invention to provide an absorbent composition that demonstrates exceptional properties such that such absorbent composition can be used in new applications.

The invention

In one aspect, the present invention relates to an absorbent composition that absorbs liquid at a relatively slow speed, but which is still able to absorb a relatively large amount of liquid, even when the absorbent composition absorbs fluid under pressure from the outside.

One alternative embodiment of the present invention relates to an absorbent composition comprising a mixture of:

a) acid nabukelevu in water water-insoluble polymer having PKandfrom about 2 to about 12; and

b) the basic substance;

where the absorbent composition demonstrates a degree of free nab the Oia 60% value free swelling volume capacity free swelling), at least about 5 minutes.

Another variant of the embodiment of the present invention relates to an absorbent composition comprising a mixture of:

a) the main nabukelevu in water water-insoluble polymer having PKandfrom 2 to about 12:

b) acidic substance;

where the absorbent composition demonstrates a degree of free swelling, which is at least about 15 grams per gram of absorbent composition and the time to reach 60% value free swelling at least about 5 minutes.

In another aspect, the present invention relates to a method for producing an absorbent composition, which demonstrates the desired absorbent properties.

In one variant embodiment of the present invention, a method of obtaining an absorbent composition comprises mixing together:

a) acid nabukelevu in water water-insoluble polymer having PKandfrom about 2 to about 12:

b) the basic substance;

where the absorbent composition demonstrates a degree of free swelling, which is at least about 15 grams per gram of absorbent composition and the time to reach 60% C is asego of the invention, the way to obtain an absorbent composition comprises mixing together:

a) the main nabukelevu in water water-insoluble polymer having PKbfrom about 2 to about 12:

b) acidic substance;

where the absorbent composition demonstrates a degree of free swelling, which is at least about 15 grams per gram of absorbent composition and the time to reach 60% value free swelling at least about 5 minutes.

In another aspect, the present invention relates to absorbent disposable article comprising the absorbent composition of the present invention, which shows the desired absorbent properties.

In one variant embodiment of the present invention, an absorbent disposable article includes permeable to liquid top layer, back layer attached to the upper layer, and an absorbent structure disposed between the top layer and back layer, where the absorbent structure comprises an absorbent composition of the present invention.

The drawing shows an illustration of the equipment used to determine the values of freedom is a description of preferred embodiments of the invention.

So, it was discovered that can be obtained absorbent composition, which shows a relatively high total capacity to absorb the liquid, and a relatively slow speed fluid absorption. In accordance with this invention, the absorbent composition may be obtained by blending together the acidic substance and a basic substance, where each of the main acid substances has specific properties, and absorbent composition demonstrates a significant and unexpected improvement of its absorbent properties, including increased total absorption liquid, and a slower rate of absorption liquid, in comparison with the properties shown only either acidic or basic substances.

The absorbent composition of the present invention typically comprises two necessary, but a different matter. The first substance is nabuhay in water water-insoluble polymer. Used in the absorbent composition of the present invention nabuhay in water water-insoluble polymer to a large extent must ensure that the absorbent composition of its capacity to absorb the liquid. As such, nabuhay in water Wagoner the project for a fluid absorbent composition.

It is assumed that used here, the term "nabuhay in water water-insoluble" refers to a substance that, when exposure to excess water, swells to an equilibrium volume, but does not dissolve in the solution. As such, Nabakevi in water water-insoluble substance usually retains its original identity or physical structure, but in a highly swollen state at the time of water absorption and, therefore, must have physical integrity sufficient to withstand the flow and fusion with neighboring particles.

Used here, the substance should be considered a water-soluble, when it essentially dissolves in excess water to form a solution, thereby losing its original shape, usually in the form of (micro) particles, and becoming, in essence, molecular dispersed throughout the aqueous solution. As a rule, water-soluble substance is free from a significant degree of crosslinking, as the stitching tends to make the water-insoluble substance.

One property nabukelevu in water water-insoluble polymer, which is important for its effectiveness in ensuring the required amount of the capacity to absorb the liquid for absor the higher molecular weight will exhibit a higher capacity to absorb the liquid, compared to Nauheim in water water-insoluble polymer with a lower molecular weight.

Nabuhay in water water-insoluble polymer used in the absorbent composition may, in General, have a wide range of molecular masses. Nabuhay in water insoluble in water, the polymer having a relatively high molecular weight is often advantageous for use in this invention. However, a wide range of molecular masses, in General, suitable for use in this invention. Nabukenya in water water-insoluble polymers suitable for use in this invention should preferably have an average-weight molecular weight higher than about 100,000, more advantageously more than about 200,000, preferably, more than 500000, more preferably than about 1,000,000 and up to 10000000. Methods for determining the molecular weight of the polymer is usually known in this field.

Sometimes it is more convenient to Express the molecular weight of the polymer in terms of its viscosity in a 1.0 wt.% aqueous solution at 25oC. the Polymers suitable for use in this invention preferably have a viscosity of 1.0 wt.% aqueous solution at 25oC from about 100 Santi 80,000 centipoise (80,000 mPas), and most preferably from about 1,000 centipoise (1000 mPas) to about 80,000 centipoise (80,000 mPas).

Nabuhay in water water-insoluble polymer used in the absorbent composition is usually stitched. The number of links should normally be higher than the minimum amount sufficient to make the polymer water-insoluble, but below some maximum number, in order to allow enough polymer to swell in water, so that nabuhay in the water insoluble polymer has absorbed the desired amount of liquid.

The binding polymer can be performed by using either of two different types of cross-linking means. The first type of cross-linking means is a polymerized cross-linking agent. Suitable polymerized cross-linking means are normally reactive with respect to the monomer or monomers used for obtaining the polymer and, therefore, typically include at least two functional groups that can interact with the monomers. Examples of suitable curable cross-linking means include ethylene-unsaturated monomers, such as N,N'-methylene bis-acrylamide for free radical polymer is a represents a latent crosslinking agent. Latent crosslinking funds typically do not participate in the overall process of polymerization, but, instead, are reactive with respect to the polymer at a later point of time when provided appropriate condition staple. Suitable conditions post-processing include the use of heat, such as temperatures above about 60oWith, exposure to UV irradiation, exposure microwaves, steam treatment or processing high humidity, high pressure processing, or treatment with organic solvent.

Latent crosslinking means, suitable for use in this invention are generally water-soluble. Suitable latent crosslinking agent is an organic compound having at least two functional groups or functionalities capable of interacting with carboxy, carboxyl, amino, or hydroxyl groups present in the polymer. Examples of suitable latent cross-linking means include, but are not limited to, diamines, polyamine, diols, polyols, polycarboxylic acids and polyoxide. Another natural latent crosslinking agent includes a metal ion with more than two positive saraparker represents a cationic polymer, suitable schiffauer means is a polyanionic substance, such as sodium polyacrylate, carboxymethylcellulose, or polyphosphate. Nabuhay in water water-insoluble polymer used in the absorbent composition may be either acidic or basic in nature. Used herein, the term "acid" substance, as I believe, refers to the substance that can act as electron acceptor. In General, acid nabukenya in water water-insoluble polymers used in the absorbent composition, usually are, by their nature, subacid. As such, acid nabukenya in water water-insoluble polymers used in absorbent compositions preferably have PKandfrom about 2 to about 12, more preferably from about 2 to about 10, and most preferably from about 3 to about 6. Sometimes it is more convenient to measure the pH of the monomer or monomers used for obtaining the polymer. Although the pH of the monomer or monomers and polymers derived from these monomers may not be identical, such pH values, essentially, should be similar. As such, acid nabukenya in water water-insoluble polymers used in absorbent HDMI is occhialino from about 2 to about 10, and most preferably from about 3 to about 6. If the polymer is produced from two or more monomers, each of the monomers used should preferably have PKandfrom about 2 to about 12, more preferably from about 2 to about 10, most preferably from about 3 to about 6, although can be used small amounts of monomers having the PKandless than about 2, or more than about 12 until such monomers do not have a negative effect on the required properties nabukelevu in water water-insoluble polymer used here.

The use of acid nabukenya in water water-insoluble polymers, which are strongly acidic demonstrating PKandless than about 2, as it leads to absorbent compositions, which typically do not exhibit the desired slow rate of absorption of liquids. The use of acid nabukenya in water water-insoluble polymers that are too low, demonstrating the PKandhigher than about 12, as it usually leads to absorbent compositions, which, in General, do not demonstrate the required ability to absorb liquid. PKandacid presented Aut in terms such as a specific temperature at which it will be used nabuhay in water water-insoluble polymer. Preferably, PKandmeasured at about 25oC. In General, the weaker the acid, the higher the PKandthe value should be. PKandvalues for many acids at different temperatures are well known and can be found in any of the numerous available sources such as the CRC Handbook of Chemistry & Physics, 75thEdition, edited by David R. Lide, CRC Press (1994).

Suitable weak acid nabukenya in water water-insoluble polymers typically include functional groups that can act as a weak acid. Such functional groups include, but are not limited to, carboxyl group, sulfate group, a sulfite group, and a phosphate group. Preferably, the functional groups are carboxyl groups. Typically, the functional group is attached to cross-linked polymer basis. Suitable polymeric bases include polyacrylamides, polyvinyl alcohols, copolymers of ethylene and maleic anhydride, polyvinyl ethers, polyacrylic acid, polyvinylpyrrolidone, polyvinylchoride, and their copolymers. In addition, can be used polymer clay is xiphopenaeus, algini, alginates, carragenan, acrylic grafted starches, acrylic grafted cellulose, and their copolymers. Additionally, there may be used synthetic polypeptides, such as poliasparaginovaya acid and polyglutamine acid.

It is necessary that the acid nabuhay in water, water-insoluble polymer was in the form of the free acid. In General, it is desirable that the acid nabuhay in the water insoluble polymer is advantageously had, at least about 50 molar percent, more advantageously at least about 70 molar percent, most advantageously at least about 80 molar percent, more preferably at least about 90 molar percent, and most preferably, in the main, about 100 molar percent of the acidic functional groups in the form of the free acid. Alternatively, in this case, acid nabuhay in water water-insoluble polymer should not be substantially neutralized when used in absorbent compositions of the present invention. In General, it is desirable that the acid nabuhay in water water-insoluble polymer had a degree of neutralization of its acidic functional groups, which is advantageously less than about who's interest more preferably less than about 10 molar percent, and most preferably mainly about 0 molar percent.

Used here, the term "basic" substance, as expected, refers to a substance that can act as electron donor. In General, basic, nabukenya in water, water-insoluble polymers used in the absorbent composition, usually are weakly basic in nature. As such, the main nabukenya in water water-insoluble polymers used in absorbent compositions preferably have PKbfrom about 2 to about 12, more preferably from about 2 to about 10, and most preferably from about 3 to about 6. Sometimes it may be more convenient to measure the pH of the monomer or monomers used for obtaining the polymer. Although the pH of the monomer or monomers and polymers derived from such monomer or monomers may not be identical, such pH values should be mostly similar. As such, the main nabukenya in water water-insoluble polymers used in the absorbent composition, usually derived from monomers, which preferably have the PKbfrom about 2 to about 12, more preferably from about 2 to OK is gdy of the used monomers, should preferably have PKbfrom about 2 to about 12, more preferably from about 2 to about 10, most predpochtitelno from about 3 to about 6, although can be used small amounts of monomers having the PKbless than about 2, or more than about 12 until such monomers do not have a negative effect on the required properties nabukelevu in water water-insoluble polymer used here.

Using basic nabukenya in water water-insoluble polymers, which are strongly acidic, demonstrating PKbless than about 2, as it leads to absorbent compositions, which typically do not exhibit the desired slow rate of absorption of liquids. Using basic nabukenya in water water-insoluble polymers that are too weakly basic, showing the PKbhigher than about 12, as it usually leads to absorbent compositions, which, in General, do not demonstrate the required ability to absorb liquid. PKbthe Foundation represents the degree of dissociation or, in other words, the power of reason, and as expected, his (PKb) is measured in conditions such as specific is Ino, PKandmeasured at about 25oC. In General, the weaker the base, the higher the PKbthe value should be. PKbvalues for bases at different temperatures are well known and can be found in any of the numerous available sources such as the CRC Handbook of Chemistry & Physics, 75thEdition, edited by David R. Lide, CRC Press (1994).

Suitable weakly basic nabukenya in water water-insoluble polymers typically include functional groups that can act as a weak base. Such functional groups include, but are not limited to, primary, secondary, or tertiary amino group, aminogroup, imagegroup, and amidopropyl. Preferably, the functional groups are amino groups. Typically, the functional group is attached to cross-linked polymer basis. Suitable polymeric bases include polyamine, polyethyleneimine, polyacrylamides and poly(connection) Quaternary ammonium compounds, and their copolymers. Additionally, there may be used polymers based on natural polysaccharides and these include chitin and chitosan. Additionally, there may be used synthetic polypeptides, such as polyasparaginic, polyglutamine, polylysine, and polyalanine.

You, who eat it is desirable that basically nabuhay in the water insoluble polymer is advantageously had, at least about 50 molar percent, more advantageously at least about 70 molar percent, preferably at least about 80 molar percent, more preferably at least about 90 molar percent, and most preferably, in the main, about 100 molar percent of their basic functional groups in free base form. Alternatively, in this case, basically nabuhay in water water-insoluble polymer should not be substantially neutralized, when used in absorbent compositions of the present invention. In General, it is desirable that basically nabuhay in water water-insoluble polymer had a degree of neutralization of its basic functional groups, which is advantageously less than about 50 molar percent, more beneficially less than about 30 molar percent, preferably less than about 20 molar percent, more preferably less than about 10 molar percent, and most preferably mainly about 0 molar percent.

Acidic or basic nabuhay in water water-insoluble polymer, in most cases, you can aemy in the water insoluble polymer may take, include particles, flakes, fibers, films, and nonwoven structures. When the absorbent composition is used in an absorbent disposable products, it is normally desirable that the acidic or basic nabuhay in water water-insoluble polymer was in the form of discrete particles, fibers, flakes. When it is in the form of particles, it is normally desirable that the particle had a maximum cross-sectional dimension is advantageously in the range from about 50 micrometers to about 2000 micrometers, preferably in the range from about 100 micrometers to about 1000 micrometers, and more preferably in the range from about 300 micrometers to about 600 micrometers.

Commercially available superabsorbents are usually found mainly in neutralized or salt form. This is because, in General, in order to have a relatively high capacity for liquid absorption, nabuhay in water water-insoluble polymer should be a polyelectrolyte. However, as discussed here, acidic or basic nabukenya in water water-insoluble polymers used in this invention are generally in the form of free acid or free base, respectively. In addition, since the acid or the basis of the ect, relatively weak by nature, such weak acid or basic functionality does not easily dissociate when placed in a liquid, such as water or an aqueous solution of sodium chloride. Therefore, such a weak acid or basic nabukenya in water water-insoluble polymers in the form of free acid or free base, respectively, are usually not, in themselves, relatively high absorption capacity of the liquid.

In the present invention it was found, however, that when such acidic or basic nabuhay in water water-insoluble polymer, mainly in the form of free acid or free base, respectively, is mixed with the main second substance or acidic second substance, respectively, then the resulting absorbent composition will demonstrate how a relatively high capacity for the absorption of liquid, and a relatively slow rate of absorption of the liquid. It is believed, is because when the mixture is placed in an aqueous solution, acid or basic nabuhay in water water-insoluble polymer, mainly in the form of free acid or free base, respectively, communicates with the main second substance or the St or main nabukelevu in water water-insoluble polymer from the form of the free acid or free base, accordingly, to form the corresponding salt. As such, the mixture containing the transformed nabuhay in water water-insoluble polymer, will now show a relatively high capacity for the absorption of liquid. However, because the transformation nabukelevu in water water-insoluble polymer, from the form of the free acid or free base, respectively, in the form of a corresponding salt is a relatively slow process of ionization and ion diffusion in the polymer nabuhay in water water-insoluble polymer will also demonstrate a relatively slow rate of absorption of the liquid. In addition, the transformation nabukelevu in water water-insoluble polymer, from the form of the free acid or free base, respectively, in the form of the corresponding salts in the electrolyte-containing solution, such as aqueous solution of sodium chloride, has a significant demineralizing effect on the electrolyte-containing solution, thereby improving associated with fluid absorption characteristic mixture comprising nabuhay in water water-insoluble polymer, facilitating associated with the salt poisoning effect.

In contrast to the above, it was found that one is Arnau patterns, does not demonstrate the required described herein, the absorbent properties. It is believed, is because such acidic basic functional groups within the same molecular structure can usually interact with each other and this can lead to supersewn polymer structure. As such, it is usually impossible to obtain an absorbent composition of the present invention, by obtaining the copolymer of the acidic and basic monomers or by obtaining the dispersion at the molecular level, such as in aqueous solution, a water-soluble acidic or basic substances, because during such copolymerization or (a) dispersion at the molecular level acidic or basic substances can usually interact with each other and to sew.

In one variant embodiment of the present invention, the absorbent composition will comprise a mixture of weak acid nabukelevu in water water-insoluble polymer, mainly in the form of free acid, and base of the second substance. Examples of suitable second main substances include, but are not limited to, polymeric base materials, such as polyamine, polyimide, polyamides, poly (connection) Quaternary am is esta, such as organic salts and aliphatic and aromatic amines, imine, and amides; and inorganic bases such as metal oxides such as aluminum oxide; hydroxides such as barium hydroxide; salts, such as potassium carbonate; and mixtures of them. The main second substance may be either a strong or weak base. But the strength of basicity of the basic second substance, as it was established, has an effect on the speed of absorption liquid absorbent composition. In General, the absorbent composition including a relatively stronger second main substance will exhibit a relatively faster speed fluid absorption in comparison with absorbent composition including a relatively weaker second main substance.

In one advantageous variant embodiment of the present invention, the main second substance may be also respectively Nauheim in water water-insoluble polymer. In this variant embodiment, as an acid nabuhay in water water-insoluble polymer and the basic Nabakevi in water water-insoluble polymer, the second substance can be used in order to contribute to the total absorption capacity of the liquid absorbent composition, compared to the primary of the second substance, which is not Nauheim in water water-insoluble polymer. However, it was found that when the main second substance is Nauheim in water water-insoluble polymer, it is normally desirable that such basic Nabakevi in water water-insoluble polymer, the second substance is preferably had the PKbfrom about 2 to about 12, more preferably from about 2 to about 10, and most preferably from about 3 to about 6. The primary nabukelevu in the water insoluble polymer of the second substance, which is strongly basic, showing the PKbless than about 2, as it leads to absorbent compositions, which, in General, do not exhibit the desired slow rate of absorption of liquids.

In another variant embodiment of the present invention, the absorbent composition typically includes a mixture of weakly basic nabukelevu in water water-insoluble polymer, mainly in the form of a free base, acid and second substances. Examples of suitable acidic second substances include, but are not limited to, polymeric acidic substances such as polyacrylic kislotalimonnaya acid; organic acidic substances, such as aliphatic and aromatic acids; and inorganic acids such as metal oxides such as aluminum oxide; and salts, such as ferric chloride. Acid the second substance may be either a strong or weak acid. However, the strength of the acidity of the acid of the second substance has been found to affect the absorption rate of the liquid absorbent composition. In General, the absorbent composition including a relatively strong acid, the second substance will exhibit a relatively more rapid rate of absorption of the liquid compared with the absorbent composition including a relatively weak acidic second material.

In one advantageous variant embodiment of the present invention, the second substance is an acid may also be respectively Nauheim in water water-insoluble polymer. In this variant embodiment, as basically nabuhay in water water-insoluble polymer, and an acid Nabakevi in water water-insoluble polymer, the second substance can be used in order to contribute to the total absorption capacity of the liquid absorbent composition, thereby achieving Sneem acid of the second substance, which is not Nauheim in water water-insoluble polymer. However, it was found that the acid when the second substance is Nauheim in water water-insoluble polymer, it is normally desirable that such acid Nabakevi in water water-insoluble polymer, the second substance is preferably had the PKandfrom about 2 to about 12, more preferably from about 2 to about 10, and most preferably from about 3 to about 6. The use of acid nabukelevu in the water insoluble polymer of the second substance, which is strongly acidic demonstrating PKandless than about 2, as it leads to absorbent compositions, which, in General, do not exhibit the desired slow rate of absorption of liquids.

The basic or acidic second material, in most cases, can be used in absorbent compositions in several forms. Examples of forms that are basic or acidic second substance may include particles, flakes, fibers, films, and nonwoven structures. When the absorbent composition is used in an absorbent disposable products, usually you want the basic or acidic second substance is stica had a maximum cross-sectional dimension is preferably in the range from about 50 micrometers to about 2000 micrometers, more preferably in the range from about 100 micrometers to about 1000 micrometers, and most preferably in the range from about 300 micrometers to about 600 micrometers. The absorbent composition may also be in the form of bicomponent fibers, where one component is a polymer and the other component is the second substance. Such a bicomponent fiber may be in the form of fibers, two of which have a common side, or bicomponent fiber type core-shell. Such bicomponent fiber can be obtained by known methods, such as co-extrusion methods.

In General, acidic or basic nabuhay in water water-insoluble polymer, mainly in the form of free acid or free base, respectively, is mixed with the main second substance or acidic second substance, respectively, in the absorbent composition in a molar ratio of the corresponding acid of the basic functionalities, sufficient to obtain an absorbent composition with the desired absorbent properties. The molar ratio of acidic or basic nabukelevu in water water-insoluble polymer, respectively, to the main second substance or kitpositive from about 2:1 to about 1:2, and most preferably is about 1:1.

We offer absorbent composition has the ability to absorb fluid, here referred to as free swelling (SN, FS). The method by which determine the degree of free swelling below in connection with examples. The degree of free swelling, defined as below, and reported here relate to the amount in grams of an aqueous solution containing 0.9 weight percent sodium chloride, which can absorb grams of a substance through about 10 hours under a slight load about 0,0689 kPa (0.01 pound per square inch (psi)). Generally, it is desirable that the absorbent composition of this invention had an initial degree of free swelling to load about 0,0689 kPa, at least about 15, it is advisable, at least about 20, preferably at least about 25, and up to about 200 grams per gram. It is assumed that when used herein, the term "initial degree of free swelling" refers to the degree of free swelling demonstrated by the substance, measured within about one day after receiving the substance while the substance is stored in the environment conditions is 2">

In addition, the absorbent composition of the present invention preferably has the ability to absorb fluid, when the absorbent composition is under external pressure or load, referred to here as the absorbency under load (WSPN, AUL). Synthetic polymeric materials such as sodium polyacrylate, which usually has a high ability to absorb a liquid while under load, it is found that minimizes the phenomenon of gel blocking when included in absorbent products. The method by which determine the absorption capacity under load, are presented below in connection with examples. The magnitude of the absorbency under load, defined as below, and reported here relate to the number of grams of an aqueous solution containing 0.9 weight percent sodium chloride, which can absorb grams of a substance through about 10 hours under a load of about 2,0684 kPa (0.3 pound per square inch (psi)). Generally, it is desirable that the absorbent composition of the present invention had the value of the initial absorbency under load, to load about 2,0684 kPa, at least about 15, it is advisable, at least is used here, the term "value of the initial absorbency under load" refers to the magnitude of the absorbency under load, demonstrated by the substance, measured within about one day after receiving the substance until the substance is stored in environmental conditions, such as approximately 24oC and a relative humidity of from about 30 to about 60 percent.

The absorbent composition of the present invention preferably has the ability relatively slowly to absorb the liquid. Value (quantification, quantification) speed used here, which any absorbent composition or the present invention, or those that do not represent the present invention, absorbs liquid, usually referred to as the time to reach 60 percent of the value of free swelling. The method by which to determine the time to reach 60 percent of the value of free swelling below in connection with examples. Time values reach 60 percent of free swelling, defined as below, and reported here refer to the time in minutes required for absorbent composition to absorb about 60 procentage absorbent composition. Generally, it is desirable that the absorbent composition of this

the invention had the time to reach 60 percent of the value of the free swelling of at least about 5 minutes, it is advisable from about 5 minutes to about 300 minutes, more suitable from about 10 to about 200 minutes, preferably from about 20 minutes to about 100 minutes, and more preferably from about 30 minutes to about 60 minutes.

The absorbent composition of the present invention preferably has the ability relatively slowly to absorb the liquid, when the absorbent composition is floor external pressure or load. The velocity used here, which any absorbent composition or the present invention, or those that do not represent the present invention, absorbs the liquid, while the absorbent composition is under external pressure or load, usually referred to as the time to reach 60 percent of the value of the absorbency under load. The method by which to determine the time to reach 60 percent of the value of the absorbency under load, are presented below in connection with examples. Time values reach 60 percent of the value of vetiva in minutes want absorbent composition to absorb about 60 percent of the total absorption capacity of absorbent composition represented by the absorbency under load of the absorbent composition. Generally, it is desirable that the absorbent composition of the present invention had the time to reach 60 percent of the value of the absorbency under load of at least about 5 minutes, it is advisable from about 5 minutes to about 300 minutes, more suitable from about 10 to about 200 minutes, preferably from about 20 minutes to about 100 minutes, and more preferably from about 30 minutes to about 60 minutes.

It was found that the absorbent composition of the present invention can be obtained using a simple method. In General, the method of obtaining the absorbent composition includes a step of mixing together the acidic or basic nabukelevu in water water-insoluble polymer, mainly in the form of free acid or free base, respectively, with the main second acidic substance or the second substance. As such, in one embodiment, the embodiment of the present invention, the absorbent composition may be obtained by mixing together the sour Nueva. In another variant embodiment of the present invention, the absorbent composition may be obtained by mixing together the main nabukelevu in water water-insoluble polymer, mainly in the form of a free base and the acid of the second substance.

Such mixtures should be obtained under conditions that are sufficient to acidic or basic nabuhay in water water-insoluble polymer, mainly in the form of free acid or free base, respectively, and the main second acidic substance or the second substance can be effectively mixed together. Such mixtures it is advisable to shake, stir or otherwise mix in order to achieve effective mixing of the polymer and a second substance that is formed mainly of a homogeneous mixture. Equipment to achieve the shaking, stirring, or mixing widely known and include simple mixers and mixers.

Although the main components of the absorbent composition of the present invention have been previously described, such absorbent composition is not limited and may include other components that do not render harmful influence on absorbent composition having the required strictly the s components, include, without limitation, pigments, antioxidants, stabilizers, surfactants, waxes, activators flow, solid solvents, (micro) particles and substances added to improve processing AIDS absorbent composition.

The absorbent composition of this invention suitable for use in absorbent disposable products, such as personal hygiene products such as diapers, training pants, baby handkerchiefs, hygiene care products for women, products for those suffering from adult incontinence; and medical products such as wound dressings or surgical capes or Drapes. When the absorbent composition of the present invention is intended for use in absorbent disposable products, it is usually necessary that the absorbent composition had a neutral or slightly acidic in nature. For this particular use, this usually requires that the molar ratio of acidic or basic nabukelevu in water water-insoluble polymer and the basic or acidic second substance was approximately 1 to 1.

In one variant embodiment of the present invention, the absolute, recipiency to the upper layer, and an absorbent structure disposed between the top layer and back layer, where the absorbent structure comprises an absorbent composition of the present invention where the absorbent composition demonstrates the desired absorbent properties.

Absorbent disposable products, according to all the aspects of this invention are usually subjected during use multiple attacks body fluids. Accordingly, it is desirable that the absorbent disposable products were able to absorb multiple attacks of body fluids in quantities to which the absorbent products and structures will be exposed to during use. Attacks usually are separated from each other by a period of time.

For professionals in this field is obvious, what are the substances suitable for use as the top layer and back layer. Examples of substances suitable for use as the top layer, are substances, permeable to fluids, such as multilayer associated spinning (staple) polypropylene or polyethylene, having a weight basis of from about 15 to about 25 grams the society, impervious to liquids, such as polyolefin film, and permeable materials, such as microporous polyolefin film.

The absorbent composition is typically present in an absorbent structure in combination with a fibrous matrix. The fibrous matrix may be taken in the form of, for example, felt from crushed wood pile fabric layer, hadrosaurines sheet cellulose, or mechanically softened sheet of cellulose. Convenient to the fibrous matrix was formed to hold or delay absorbent composition within or on the structure. The absorbent composition may be included in the fibrous matrix or fibrous matrix either during or after the formation of the basic form of a fibrous matrix. Fibrous matrix used in the present invention, can be obtained by laying method using air, wet seal, or by using significantly different (known to experts in the art of forming fibrous matrix.

The absorbent composition is typically present in an absorbent structure or product of the present invention in amounts effective is icesto fluid. It is advisable that the absorbent composition is present in an absorbent structure in an amount of from about 1 to about 99 weight percent, preferably in amounts of from about 5 to about 95 weight percent, and more preferably from about 10 to about 90 weight percent, based on the total weight of the absorbent composition and the substrate in the absorbent structure.

Test methods

Free swelling ability and the time to reach 60 percent of free swelling

Free expansion (SN, FS) is a test that measures the number of grams of an aqueous solution containing 0.9 weight percent sodium chloride, which can absorb gram of the substance for 10 hours in minor applied load or restraining force, such as about 0,0689 kPa (of 0.01 pounds per square inch).

As for the drawing, the device and method of determination of the free swelling and absorbency under load will be described below. Perspective view of the device shown in position during the test. Shows the laboratory of the lifting device 1 having the 2 for regulating the raising and lowering of the platform 3. Laboratory tripod 4 supports p is La, which is rigidly supported with laboratory tripod. Plastic Cup 8 for sample, which contains a sample of the superabsorbent material to be tested, is permeable to liquid the bottom and lies in a Petri dish 9, which contains a salt solution, subject to absorption. To determine only the values of the absorbency under load, the load 10 is on top of the connection plate (not shown) lying on top of the sample of the superabsorbent material (not shown).

Cup for sample consists of a plastic cylinder having an inner diameter of 2.54 cm (1 inch) and the outer diameter of 3.175 cm (1.25 inches). The bottom of the Cup for the sample obtained by gluing 100 mesh, metal mesh, with openings of 150 μm, by the end of the cylinder by means of the heating grid above the melting point of the plastic and cuddling plastic cylinder to the hot grid to melt plastic and bind the grid with a plastic cylinder.

Modified thickness gauge used to measure the expansion of the sample during the absorption of the salt solution is Mitutoyo Digimatic indicator IDC Series 543, Model 543-180 with the range 0-1,27 cm (0-0,5 inches) and accuracy 0,000127 cm (0,00005") (Mitutoyo Corporation, 31-1 the chick inside the casing of the meter. This spring is moved to provide a free fall sensor, which has a force directed downwards about 27 grams. In addition, the nozzle at the top of the sensor, located above the casing of the meter, also moves, allowing you to attach the sensor to the spring 5 for suspension (available from McMaster-Carr Supply Co., Chicago, Illinois, Item 9640K41), which serves to counteract or reduce the downward force of the sensor to about 1 grams to 0.5 grams. The wire hook can be glued to the tip of the sensor to attach to the spring for hanging. The lower end of the probe is also provided with an elongated needle (Mitutoyo Corporation, Part 131279), which enables the sensor to log into the Cup for a sample.

To perform tests, 0,160 grams of sample absorbent substance, which is usually sieved to particle size of between 300 and 600 microns, is placed in a Cup for sample. The sample was then covered with a plastic strip in the form of a disc, weighing 4.4 grams and a diameter of approximately 2,527 cm (0,995 inch), which serves to protect the sample from violations (disturbance) during the test, and, in addition, from an uneven load on the entire sample. Then a Cup for sample, with the sample substance and a disk spacer, weighed to dimout until while the upper side of the plastic disc pads not skontaktiruem with the tip of the probe. The meter is placed in the zero position. To start the test, in a Petri dish add enough salt solution (50-100 ml). The distance that the plastic disk-strip rises with the expansion of the sample, as it absorbs the saline solution, is measured by the sensor. This distance is multiplied by the cross sectional area inside the Cup for sample, is a measure of the amount of expansion of the sample due to absorption. Changes in the density of the salt solution and sample mass, the amount of absorbed salt solution, is easily calculated. The weight of saline solution absorbed after approximately 10 hours, is the degree of free swelling, expressed as grams of saline solution per gram of absorbent. If necessary, the testimony of the modified measuring the thickness can continuously be entered into the computer (Mitutoyo Digimatic miniprocessor DP-2 DX), to perform calculations and to obtain data free of swelling. As a cross check, free swelling can also be determined by determining the difference in mass between the Cup of the sample before and after ispytaniyah monitoring values of degrees of free swelling, obtained using the computer, can easily determine the time to reach 60 percent of free swelling.

Absorption capacity under load and the time to reach 60 percent absorbency under load

Absorption capacity under load (WSPN, AUL) is a test that measures the amount in grams of an aqueous solution containing 0.9 weight percent sodium chloride, which can absorb gram of the substance for 10 hours under an applied load or restraining force of about 2,0684 kPa (0.3 psi). The procedure of measurement of the absorbency under load absorbent composition essentially identical to the procedure of measuring degrees of free swelling, except that a weight of 100 grams is placed on top of the plastic disc pads, thereby applying a load of about 2,0684 kPa on absorbent composition, as it absorbs the saline solution. From continuous monitoring values absorbency under load, obtained with the help of the computer can easily determine the time to reach 60 percent absorbency under load.

Examples

For use in the following when the and. Commercial polyacrylate superabsorbent (sample 1)

As a control substance, a commercial polyacrylate superabsorbent, denoted as IM 3900, was obtained from Hoechst Celanese. Superabsorbent had a degree of neutralization of about 70 molar percent.

b. Gel polyacrylic acid (samples 2 through 5)

In a 500 ml vessel, which contains 175 grams of distilled water, added 27 grams of acrylic acid, 0,065 grams of potassium persulfate (K2S2O8), and to 0.108 grams of N,N'-methylene of bisacrylamide, all available from Aldrich Chemical Company, and stirred at room temperature to obtain a completely dissolved solution. The vessel is then immersed in a water bath at 60oWith at least 3 hours. The vessel is continuously shaken. The formed gel polyacrylic acid cut and dried in a ventilated oven at a temperature of 80oC for 10 hours. Fully dried polymer was pulverized to particles using a commercial mixer from Warring (Model 34BL97) and sieved to particles of different sizes.

C. Gel polyacrylic acids of various degrees of neutralization (samples 6 through 8)

Particles of gel polyacrylic acid described above in section b, neutralize astora sodium hydroxide. The degree of neutralization is controlled by the ratio of gel polymer solution of sodium hydroxide. The swollen gel is dried at ambient conditions (23oC, relative humidity 30%) for at least three days prior to testing absorbing ability.

d. Gel polyacrylic acid of different molecular masses (samples 9 to 11)

Linear prepolymers polyacrylic acid three different molecular masses get from Polysciences, Inc. Average-weight molecular weight polyacrylic acids make up to 60000 240000 and 4000000, respectively. Each of the polyacrylic acid is dissolved with getting a 2 percent aqueous solution in the mixer, manufactured KitchAid (Model K45SS), and the solution is added 3 percent polyethylene oxide-polypropyleneoxide copolymer (based on the dry weight polyacrylic acid). The polyethylene oxide-polypropyleneoxide copolymer from Polysciences, Inc. has a molecular weight of about 3000 and the molar ratio of ethylene oxide to propylene oxide is from about 0.8 to 1. The solution is stirred for at least for 30 minutes and then dried in an oven at 60oC. Then, the dried polymer was ground and sieved, selecting a particle size of from 300 to 600 μm, heated at 200oWith in accordance with tosan (Sample 12)

Twenty grams of chitosan flakes, available from Vanson, mixed with 1000 grams of 1 wt.% solution of acetic acid in the mixer, manufactured KitchAid (Model K45SS). Then the solution is dried at 60oC for at least 20 hours and pulverized to a particle size in the range from 300 to 600 microns. Particles of chitosan acetate are suspended in 1 wt.% the sodium hydroxide solution at a ratio of 1 gram of chitosan acetate to 100 grams of sodium hydroxide solution. With continuous stirring using magnetic stirrer, chitosan acetate is converted into chitosan within at least 5 hours. The treated particles of chitosan then washed with distilled water four times when the ratio of chitosan to water is 1 to 1000, to completely remove residual sodium acetate. Washed chitosan dried at 80oC.

f. Polyacrylamidegel sulfonic acid (example 13)

Ten grams of monomer acrylamidophenylboronic acid are dissolved in 40 grams of distilled acid in a 100 ml conical flask. To this solution add 0.5 grams of methylenebisacrylamide as a cross-linking agent and dissolve. The solution is blown with nitrogen for 15 minutes and the conical flask sealed and placed in a water of persulfate potassium and 0.015 gram of sodium bisulfite. Polymerization continued for 12 hours at 60oC, and then the gel is cut into cubes of approximately one inch and washed in distilled water. The washed gel is dried at 50oWith throughout the night and crush using a commercial mixer, manufactured Warring (Model 34BL97). The polymer after grinding sieved and the particle size in the range from 300 to 600 microns is collected for the measurement of absorbency.

q. Polydiallyldimethyl hydroxide (sample 14)

About 0.21 gram methylenebisacrylamide dissolve as cross-linking means in 37 ml of 60 wt.% an aqueous solution of monomer - chloride of diallyldimethylammonium in 100 ml conical flask. The solution is blown with nitrogen for 15 minutes and the conical flask sealed and placed in a water bath at 60oC. initiate Polymerization by adding to the reaction mixture of 0.04 g of potassium persulfate and 0.15 grams of sodium bisulfite. Polymerization continued for 12 hours at 60oWith subsequent cutting gel with obtaining small pieces (cubes measuring about 2.5 cm (one inch)). The gel pieces are washed with 2 wt.% a solution of sodium hydroxide until then, until all chlorine ions in the polymer is not sharing the NYM silver nitrate to determine the chlorine ions. The absence of chloride ions is an indicator of complete transformation in the hydroxide form. The gel is washed thoroughly with distilled water up until the pH of distilled water after washing will not be the same as the pH of water used for washing. The gel is dried at 50oC during the night and pulverized using a mixer from Warring (Model 34BL97). The polymer after grinding sieved and the particle size in the range from 300 to 600 microns is collected to measure vpityvaya ability.

Example 1.

About 0.16 g of gel polyacrylic acid, chitosan, polyacrylamidegel sulfonic acid, or politically dimethyl ammonium hydroxide, each with a particle size in the range from 300 to 600 microns, weighed separately and placed in the cylinder for trials to test their speed of absorption and total absorbent capacity. In addition, 0.16 g of mixtures of different polymers with the same range of particle size and the molar ratio of one to one of the two respective polymers are weighed and placed in a tube for testing to determine the rate of absorption and total absorbent capacity of the mixtures. The test results are illustrated in table.2. PKandthe value of dandfor acrylamidophenylboronic acid. PKbthe value for sample 14 is PKbfor diallyldimethylammonium chloride.

Example 2.

About 0.16 grams of gel polyacrylic acid, chitosan, commercial polyacrylate gel or mixtures of polyacrylic acid (with different distribution of particle size) and chitosan are weighed and placed in a tube for testing to determine their rate of absorption and total absorbent capacity. Table 3 summarizes the results obtained.

Example 3.

As a second basic substance is chosen or water-insoluble polymer gel or a water-soluble substance and mixed with sour gel polyacrylic acid, in order to evaluate the rate of absorption and total absorbent capacity. table.4 illustrates the results obtained. Used sodium hydroxide (NaOH) dissolved in 0.9 wt.% the solution of sodium chloride. Panso3or Na-citrate mixed directly with the acidic gel polyacrylic acid. Citrate Na is chinatravel salt of citric acid. PKandthe value for sample 3 represents the PKandfor acrylic acid. PKandthe value for at the ratio of acidic polymer gel to the main second polymer and assess the absorption capacity of the respective mixtures. The results are presented in table.5.

Example 5.

Gel polyacrylic acid, obtained from linear polyacrylic acids with different molecular masses, mixed with the main chitosan substance with molar ratio of 1 to 1. Estimate the speed of the liquid is absorbed and the total absorbency of such mixtures and the results are presented in table.6.

Example 6.

Gels, polyacrylic acid, with different degrees of neutralization in the range from 0 percent to 30 percent, is mixed with the main chitosan substance and are tested for absorption capacity. The results are summarized in table. 7. In table.7, S. N. (D. N.) denotes the degree of neutralization in molar percent.

Example 7.

A mixture of polyacrylic acid/chitosan to assess the absorption capacity under load (WSPN, AUL). The results are presented in table.8.

Although the present invention has been described in the above specific embodiment variants, the experts in this field it is obvious that there are numerous equivalent changes and modifications. Accordingly, it is assumed that the specific examples above do not limit cambarincola composition, comprising a mixture of: a) acid nabukelevu in water, water-insoluble polymer having PKandbetween about 2 and about 12; and containing an acidic functional group and having at least about 50 mol.% acidic functional groups in the form of a free acid and having srednevekovoy molecular weight higher than about 100,000; (b) the basic substance; where the absorbent composition demonstrates a degree of free swelling, which is at least about 15 grams per gram of absorbent composition and the time to reach 60% of the value of the free swelling of at least about 5 minutes

2. Absorbent composition under item 1, where the acid nabuhay in water, water-insoluble polymer has the PKandbetween about 2 and about 10.

3. Absorbent composition under item 1, where the acid nabuhay in water, water-insoluble polymer has at least about 70 mol.% acidic functional groups in the form of the free acid.

4. Absorbent composition under item 1, where the acid nabuhay in water, water-insoluble polymer has srednevekovoy molecular weight higher than about 200,000.

5. Absorbent composition under item 1, where the acid nabuhay in water, water is livinglogic alcohols, copolymer of ethylene and maleic anhydride, polyvinyl ethers, polyacrylic acids, polyvinylpyrrolidones, polivinilpirrolidon, carboxymetilcellulose, carboxymethyl starches, hydroxypropylcellulose of algino, alginates, Karaganov, acrylic grafted starches, acrylic grafted cellulose poliasparaginovaya acid, polyglutamic acid and their copolymers.

6. Absorbent composition under item 1, where the base material is chosen from the group consisting of polyamines, polyimines, polyamides, poly (connections) Quaternary ammonium chetinov, chitosans, Polisario, polyglutamines, polylysines, polyalanine, organic salts, aliphatic amines, aromatic amines, Iminov, amides, metal oxides, hydroxides, salts and mixtures thereof.

7. The absorbent composition according to p. 6, where the base material is nabuhay in water water-insoluble polymer.

8. The absorbent composition according to p. 7, where Nabakevi in water, water-insoluble polymer base material has a PKbbetween about 2 and about 12.

9. Absorbent composition under item 1, where the acid nabuhay in water, water-insoluble polymer and the basic substance present in absorbing the absorbent composition has a degree of free swelling, at least about 20.

11. Absorbent composition under item 1, where the absorbent composition has the time to reach 60% of the value of free swelling between about 10 minutes and about 200 minutes

12. Absorbent composition under item 1, where the absorbent composition has a value absorbency under load of at least about 15.

13. Absorbent composition under item 1, where the absorbent composition has the time to reach 60% of the value of the absorbency under load of at least about 5 minutes

14. Absorbent composition under item 1, where nabuhay in water, water-insoluble polymer comprises an acid functional group and has at least about 50 mol.% acidic functional groups in the form of the free acid, has srednevekovoy molecular weight higher than about 100,000, and acid nabuhay in water, water-insoluble polymer and the basic substance present in the absorbent composition in a molar ratio between about 10:1 and about 1:10.

15. Absorbent composition comprising a mixture of: (a) primary nabukelevu in water, water-insoluble polymer having PKbbetween about 2 and about 12; and containing basic functional group is srednevekovoy molecular weight higher than about 100,000; (b) an acid substance; where the absorbent composition demonstrates a degree of free swelling, which is at least about 15 grams per gram of absorbent composition and the time to reach 60% of the value of free swelling at least about 5 minutes

16. The absorbent composition according to p. 15, where the main nabuhay in water, water-insoluble polymer has the PKbbetween about 2 and about 10.

17. The absorbent composition according to p. 15, where the main nabuhay in water, water-insoluble polymer has at least about 70 mol.% the main functional groups in free base form.

18. The absorbent composition according to p. 15, where the main nabuhay in water, water-insoluble polymer has srednevekovoy molecular weight higher than about 200,000.

19. The absorbent composition according to p. 15, where the main nabuhay in water, water-insoluble polymer is produced from the core polymer selected from the group consisting of polyamines, polyethyleneimine, polyacrylamide, poly (connections) Quaternary ammonium, chitin, chitosan, Polisario, polyglutamines, polylysines, polyalanine and their copolymers.

20. The absorbent composition according to p. 15, is climatically, alginic acid, poliasparaginovaya acid, polyglutamic acids, aliphatic acids, aromatic acids, metal oxides, salts and mixtures thereof.

21. The absorbent composition according to p. 20, where the acidic substance is nabuhay in water, water-insoluble polymer.

22. The absorbent composition according to p. 21, where Nabakevi in water, water-insoluble polymeric acidic substance has a PKabetween about 2 and about 12.

23. The absorbent composition according to p. 15, where the main nabuhay in water, water-insoluble polymer and an acidic substance present in the absorbent composition in a molar ratio between about 10:1 and about 1:10.

24. The absorbent composition according to p. 15, where the absorbent composition has a degree of free swelling, at least about 20.

25. The absorbent composition according to p. 15, where the absorbent composition has the time to reach 60% of the value of free swelling between about 10 minutes and about 200 minutes

26. The absorbent composition according to p. 15, where the absorbent composition has a value absorbency under load of at least about 15.

27. The absorbent composition according to p. 15, where the absorbent composition>/P>28. The absorbent composition according to p. 15, where nabuhay in water, water-insoluble polymer includes basic functional group and has at least about 50 mol.% the main functional groups in free base form, has srednevekovoy molecular weight higher than about 100,000, and the main nabuhay in water, water-insoluble polymer and an acidic substance present in the absorbent composition in a molar ratio between about 10:1 and about 1:10.

29. Absorbent disposable item, including permeable to liquid top layer, back layer attached to the upper layer, and an absorbent structure disposed between the top layer and back layer, where the absorbent structure comprises an absorbent composition comprising:

a) acid nabuhay in water, water-insoluble polymer having PKandbetween about 2 and about 12; and (b) base material; where the absorbent composition demonstrates a degree of free swelling, which is at least about 15 grams per gram of absorbent composition and the time to reach 60% of the value of the free swelling of at least about 5 minutes

30. Absorbent disposable COI the absorbent structure, located between the top layer and back layer, where the absorbent structure comprises an absorbent composition comprising: a) main nabuhay in water, water-insoluble polymer having PKbbetween about 2 and about 12; and (b) an acid substance; where the absorbent composition demonstrates a degree of free swelling, which is at least about 15 grams per gram of absorbent composition and the time to reach 60% of the value of the free swelling of at least about 5 minutes

 

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