RU2441671C1 - Absorbing item with deodorizing substance - Google Patents

Abstract

FIELD: medicine. ^ SUBSTANCE: invention refers to the field of medicine. It describes an absorbing item, such as a sanitary pads, pantyshields, diapers, pull up diapers, protective devices used in the event of adult urinary incontinence. The item comprises oxigenated oil/fat as deodorizing substance. The oil/fat is preferable oxygenated in controlled conditions so that they would have peroxide index of not less than 20 meq/kg. Oil/fat are fatty acid triglycerids, for example. ^ EFFECT: absorbing items are an efficient functioning deodorizing substance. ^ 16 cl, 8 tbl, 1 ex

Description

FIELD OF THE INVENTION

The present invention relates to an absorbent article, such as a sanitary napkin, panty liner, diaper, panty diaper, adult incontinence guard, said article comprising an absorbent core and a fluid impervious back sheet, wherein the product contains deodorizing substance.

BACKGROUND OF THE INVENTION

Deodorization has become an important factor in absorbent products. Smells or unpleasant odors arise, for example, as a result of discharge from the carrier of an absorbent article or as a result of the retention of fluid released by the body in the article. These odors can put the wearer of the absorbent article in an uncomfortable position. Therefore, it is important to reduce or prevent odors in absorbent articles while they are being worn.

Examples of smelling substances that may be present in absorbent articles are sulfur compounds, aldehydes, indoles, amines, etc.

Various methods are used to prevent or reduce odors in absorbent articles that have arisen in connection with the release of body fluids. The methods are based on 1) masking odors; 2) a chemical reaction, for example, in the form of neutralization, with an acid-base system; 3) adsorption / absorption of odors, providing for the formation of surfaces that have a special affinity for odors, or large special surfaces / cavities that are able to bind the odors in question and, therefore, prevent a situation in which the substances emitting them remain in a gaseous form, and 4) bacterial growth inhibitors that reduce / prevent bacterial growth and the corresponding odors that have arisen due to large numbers of bacteria.

Perfumes or fragrances are used, for example, to mask odors / unpleasant odors. Masking agents do not remove unpleasant odors and must be added in an appropriate amount to ensure that the unpleasant odor will not penetrate or that the fragrance will not smell too much. Zeolites, silica, clays, activated carbon and / or cyclodextrin are used, for example, to adsorb smelling substances. However, some of them are sensitive to moisture, which limits their effectiveness. Sodium bicarbonate, citric acid and / or ultra-high absorbency materials with low pH are used to neutralize odors. Bacteria can form odor-causing substances, and copper acetate, an ultra-high absorption material with silver ions, and / or an ultra-high absorption acid material can be used to reduce the growth of bacteria.

The aforementioned deodorizing agents are effective against various types of odors and act through various mechanisms.

A number of odors / unpleasant odors are hydrophobic and similar unpleasant odors are absorbed and / or adsorbed by hydrophobic deodorizing agents. Hydrophobic smelling substances include, for example, some organic acids, sulfur compounds, aldehydes, indole, amines, etc., which usually exist when using absorbent products.

US Pat. No. 6,147,028 describes a deodorant in the form of siloxane-coated starch granules that are used in absorbent articles. Starch granules have a hydrophobic surface and they absorb hydrophobic material from the air.

US Pat. No. 6,479,150 describes layers of thermoplastic fiber material with a hydrophobic deodorant that is modified by a surfactant to impart a wettability to the layer. A deodorant is, for example, an aromatic deodorant.

The disadvantage of previously disclosed deodorizing substances is, inter alia, that they are difficult to distribute evenly throughout the absorbent article. This may be due to the fact that previously disclosed deodorizing materials often consist of solid particles that cannot be distributed continuously on the inner and outer surfaces of the product and essentially reduce the degree of coverage. Thus, the ability to effectively capture unwanted odors is reduced.

There remains a need to create deodorizing agents for hygiene products, and one objective of the present invention is to solve the above problems and to create an efficiently functioning deodorizing material.

SUMMARY OF THE INVENTION

The above problem is solved in the present invention by means of an absorbent article, such as a sanitary napkin, panty liner, diaper, diaper-panties, adult incontinence guard, said article containing an absorbent core and a fluid impervious back sheet while at least one oxidized lipid is added to the product as a deodorant.

In accordance with one aspect of the invention, lipids were oxidized under controlled conditions. Preferred oxidized lipids have a peroxide number determined by the Cd 8-53 method adopted by the American Oil Chemists Society (AOCS Official Method Cd 8-53 (AOCS - American Oil Chemists Society)), which is at least 20, preferably at least , 30 and most preferably at least 40 meq / kg.

In one embodiment, the absorbent core comprises hydrophilic fibers treated with said oxidized lipids. Preferably, at least a portion of said hydrophilic fibers are cellulosic fibers.

In accordance with a further aspect of the invention, at least 0.2% by weight of oxidized lipids has been added to said absorbent core, the amount being calculated based on the total weight of the hydrophilic fibers contained in the absorbent core.

In one embodiment, from 0.2 to 50 wt.%, Preferably from 0.5 to 40 wt.%, More preferably from 1 to 35 wt.% And most preferably from 3 to 30 wt.% Of oxidized lipids to the absorbent core, while the indicated amounts are calculated from the total weight of the hydrophilic fibers contained in the absorbent core.

In accordance with one aspect of the invention, the article further comprises a liquid permeable top sheet and / or one or more additional functional layers selected from: liquid receiving layers, liquid distributing layers.

In accordance with a further aspect of the invention, at least 0.2 wt.% Of the oxidized lipids has been added to said top sheet and / or additional functional layer, wherein said amount is calculated from the total weight of said top sheet and / or additional functional layer.

In one embodiment, from 0.2 to 50 wt.%, Preferably from 0.5 to 40 wt.%, More preferably from 1 to 35 wt.% And most preferably from 3 to 30 wt.% Of oxidized lipids to the top sheet and / or additional functional layer, while the indicated amounts are calculated from the total weight of the top sheet and / or additional functional layers.

In one embodiment of the invention, said article has longitudinal y and transverse x directions, two longitudinal edges and two transverse edges, while deodorant in the form of oxidized lipids is present in greater amounts in areas close to the longitudinal and / or transverse edges of the product, than in the central zone of the product provided as the fluid receiving zone.

According to a further embodiment, the absorbent article comprises elastic means, for example leg elastic elements and / or waist elastic elements, wherein at least one oxidized lipid has been added to said elastic means.

In accordance with one embodiment, the lipids are fatty acids or their derivatives. In a further embodiment, the fatty acid derivatives are fatty acid esters, in particular triglycerides.

According to a further embodiment, at least a portion of said fatty acids and / or fatty acid derivatives are unsaturated.

In one embodiment, said oxidized lipids are oxidized by treatment with ozone.

DESCRIPTION OF DRAWINGS

Figure 1 is a schematic plan view of an absorbent article in the form of a sanitary napkin or a protective device used for incontinence.

Figure 2 is a section along the line II-II in figure 1.

DEFINITIONS

The term “absorbent article” refers to articles that are placed on the skin of a carrier to absorb and retain body exudates, such as urine, feces, and menstrual fluid. The invention mainly relates to disposable absorbent articles, which means articles that are not intended to be washed or otherwise restored or reused as absorbent articles after use. Examples of disposable absorbent articles include hygiene products intended for women, such as sanitary napkins, panty liners and sanitary panties, diapers and panty diapers for incontinence babies and adults, incontinence pads, diaper inserts etc.

The term "lipid" means all fat-soluble (lipophilic) naturally occurring substances, such as fats, oils, waxes, cholesterol, steroids, monoglycerides, diglycerides, triglycerides, phospholipids and other substances.

By “oxidized lipids” is meant that the lipids underwent an oxidation process in which oxygen was introduced into the molecular structure of the lipid. An oxidizing agent is any substance that leads to the oxidation of a lipid structure, for example, gaseous oxygen, ozone or peroxides.

By “oxidized under controlled conditions” is meant that the base, that is, the lipid, has been (has) been oxidized (oxidized) to such an extent that further oxidation caused by self-oxidation due to contact with air is substantially prevented. Preferably, the lipids are oxidized so that they have a peroxide number determined by the Cd 8-53 method adopted by the American Petrochemical Society, which is at least 20 meq / kg.

DETAILED DESCRIPTION OF THE INVENTION

Figures 1 and 2 show one embodiment of an absorbent article in the form of a sanitary napkin or incontinence guard 1 for wearing in the form of an insert in a pair of underpants. The product 1, as a rule, contains a liquid-permeable top sheet 2, a liquid-impervious back sheet 3 and an absorbent core 4 enclosed between them. The product has a longitudinal direction y and a transverse direction x. It has two longitudinal side edges 6 and 7 and two transverse edges 8 and 9.

Liquid-permeable topsheet 2 may consist of a non-woven material, for example, a non-woven fabric of a spunbond production method, a non-woven fabric obtained by melt aerodynamically, a non-woven fabric obtained by carding, hydro-entangling, wet laying, etc. Suitable non-woven materials may consist of natural fibers, such as wood pulp or cotton fibers, artificial fibers such as polyester, polyethylene, polypropylene, viscose, etc., or a mixture of natural and artificial fibers. In addition, the material of the top sheet may consist of fiber bundles that can be bonded to each other to form some kind of connection configuration, such as, for example, disclosed in EP-A-1035818. Further examples of topsheet materials are porous foam materials, plastic films with holes, etc. Materials suitable as topsheet materials must be soft and non-irritating to the skin, and the fluid released by the body, such as urine or menstrual fluid, must be able to pass quickly through it.

The liquid impervious back sheet 3 may consist of a thin polymer film, for example, a polyethylene or polypropylene film, a non-woven material coated with a liquid-impermeable material, a hydrophobic non-woven material that is resistant to liquid penetration, or laminates of plastic films and non-woven materials. The backsheet material may be breathable to allow steam to escape from the absorbent core while preventing liquids from passing through the backsheet material.

The upper sheet 2 and the material 3 of the back sheet have a slightly greater extent in the plane than the absorbent core 4, and protrude beyond its edges. Layers 2 and 3 are connected to each other within their protruding parts 5, for example, by bonding or heat sealing or ultrasonic welding. In addition, the top sheet and / or back sheet may be attached to the absorbent core by any method known in the art, for example by means of glue or heat sealing or ultrasonic welding, etc. In addition, the absorbent core may not be attached to the top sheet and / or back sheet.

A bonding agent in the form of an adhesive zone 10 is provided on the back sheet side facing away from the carrier during use. The adhesive can be detachably attached to the underwear of the wearer. Removable paper 11 protects the adhesive area before use. The adhesive zone 10 may have any suitable configuration, such as elongated or transverse strips, spots, areas of complete coverage, etc.

In other embodiments of absorbent articles in accordance with the invention, other types of fastening elements, like friction fastening elements, tongues from adhesive tape or mechanical fastening elements, like fastening elements with hooks and loops (Velcro fasteners), etc., can be used to fasten products to underwear or around the waist of the wearer. Some absorbent articles are in the shape of underpants and therefore do not require special fastening means. In other cases, the absorbent article is worn in special elastic pants without the need for additional fastening elements.

The absorbent core 4 may be an absorbent core of any conventional kind. Examples of frequently occurring absorbent materials are fluff pulverized pulp, layers of tissue paper, highly absorbent polymers (so-called superabsorbents), absorbent foam materials, absorbent nonwoven materials, or the like. It is well known to “combine” fluff pulverized pulp with superabsorbents in an absorbent core. It is also well known to use absorbent bodies containing layers of various materials with different properties in terms of fluid acceptance, fluid distribution and retention. This is well known to the person skilled in the art and, therefore, need not be described in detail. Thin absorbent bodies, which are widely used in modern absorbent products, often contain a compressed mixed or layered structure of fluff pulverized pulp and ultra-high absorbency material. The size and absorbency of the absorbent core can vary to suit different applications, such as sanitary towels, panty liners, panty liners and diapers used in adult incontinence, baby diapers, panty diapers and etc.

It should be understood that the absorbent article described above and shown in the drawings is only one non-limiting example and that the present invention is not limited to it, but can be used in any type of absorbent article, as described above.

An object of the present invention is to provide absorbent articles, such as sanitary napkins for everyday use, panty liners, diapers, incontinence guards that are suitable for absorbing body fluids and which contain a deodorizing substance that effectively prevents or reduces odors in similar products that arose during the release of fluids released by the body.

In accordance with the invention, it has been shown that oxidized lipids are very effective in reducing odors from certain smelling substances that are often found in absorbent articles. Natural lipids of animal origin or plant origin very often are mixtures of mono-, di- and triglycerides and free fatty acids. Lipids can be purified, hydrated, refined, modified, and can be used individually or in different mixtures. Examples of suitable lipids that are of animal origin can be found in beeswax, oil derived from emu fat, lactis lipids, lanolin, shark liver oil, swine fat, whale oil, butter fat and solid animal fat. Examples of suitable plant-derived lipids can be found in kernel apricot oil, peanut oil, avocado oil / blackcurrant seed oil, borage seed oil, Brazil nut oil, castor oil, cocoa butter, coconut oil, corn oil , cottonseed oil, rosehip oil, evening primrose oil, grape seed oil, linseed oil, mango seed oil, rose oil, olive oil, orange peel wax, palm oil, peanut oil, rice wax, sesame oil seed, shea butter, soybean oil, sunflower seed wax, peanut oil, sesame oil, safflower oil, tobacco seed oil, poppy seed oil, tea tree seed oil, cup oil, rice bran oil, sorghum oil, oil krambe, linseed oil, perilla oil, hemp oil, tung oil, oyster oil, palm kernel oil, sweet almond oil and wheat germ oil. Further examples of lipids are oils that solidify at low temperature, which are esters of monoalcohols, for example jojoba oil, phospholipids, etc.

Triglycerides are often found in many natural fats and oils, such as rapeseed oil, olive oil, corn oil, sunflower oil, palm oil, coconut oil and butter, palm oil, cocoa butter, cocoa butter, etc. d. Most naturally occurring triglycerides contain a mixture of saturated and unsaturated fatty acids, and the ratio of saturated to unsaturated fatty acids varies with different oils. This ratio is usually given in the form of a ratio: unsaturated / saturated. Unsaturated fatty acids can be either monounsaturated or polyunsaturated. The most common fatty acids in triglycerides are palmitic acid, which is a saturated fatty acid, oleic acid, which is a monounsaturated fatty acid, linoleic and linolenic acids, which are polyunsaturated fatty acids.

The composition of some common natural oils is given below in table 1, which is taken from Bailey's Industrial Oil and Fat products, vol. 1, editor: Daniel Swern, John Wiley & Sons Inc., New York, 1979.

Table 1 Vegetable oil Saturated Fatty Acids
(the weight.%) Unsaturated fatty acids
(the weight.%) Olive oil 9.3-18.8 81.1-89.0 Sunflower oil 8.7-14.2 85-91 Rapeseed oil 6.2-9.5 90.5-93.8 Corn oil 12-18 82-88 Cacao butter 59.8 40,2

Such oils and fats typically contain antioxidants, either naturally occurring or added by the supplier, so that self-oxidation caused by contact with air is generally prevented or slowed down.

The lipids used in the present invention are oxidized by an oxidizing agent. Examples of suitable oxidizing agents are: ozone, peroxides, gaseous oxygen, peracids and nitrogen dioxide. For lipids containing antioxidants, stronger oxidizing agents like ozone and peroxides are required, but for lipids without any significant amounts of antioxidants, oxygen or air may be sufficient, i.e. self-oxidation for a sufficient period of time.

The reactivity of various lipids depends on the number of double bonds, that is, on the degree of unsaturation. Saturated lipids oxidize very slowly, while lipids with a high degree of unsaturation oxidize more quickly. The relative degrees of self-oxidation of certain fatty acids (not treated with antioxidants) at a temperature of 100 ° C are shown below in table 2 and are taken from the same reference material as the reference material for table 1.

table 2 Fatty acid Chemical formula Relative oxidation state Stearic acid C ₁₇ H ₃₅ COOH 0.6 Oleic acid C ₁₇ H ₃₃ COOH 6 Linoleic acid C ₁₇ H ₃₁ COOH 64 Linolenic acid C ₁₇ H ₂₉ COOH one hundred

The oxidation should preferably be carried out under controlled conditions so that self-oxidation is substantially prevented after the oxidation process. Preferably, the oxidized lipids should have a peroxide number determined by the Cd 8-53 method adopted by the AOCS Official Method Cd 8-53, which is at least 20, preferably at least 30, and most preferably at at least 40 meq / kg.

Lipids can be oxidized by any suitable method and by any suitable oxidizing agent, for example, by ozone, mixtures of ozone and air, or ozone and oxygen.

During the oxidation process, a number of peroxide products can be formed, such as hydroperoxides, ozonides, diperoxides and polyperoxides. In addition, some by-products, such as ketones and aldehydes, which are less desirable, may be formed. These by-products can be removed by washing the lipids with a solvent after the oxidation process. Alternatively, volatile undesirable substances can be removed by evaporation, for example, under vacuum.

In accordance with the invention, it was shown that cellulose treated with oxidized lipids, especially ozonated triglycerides, has a significant ability to reduce the release of undesirable smelling compounds, which are often found in absorbent products that absorb body fluids like urine and menstrual fluid. Examples of such smelling compounds are dimethyl sulfide (DMS), dimethyl disulfide (DMDS), and isovalerian aldehyde (IVA).

The amount of added oxidized lipids should be at least 0.2 wt.% Of the total weight of the treated pulp.

The treated cellulose may be mixed with untreated cellulose and / or an ultra-high absorbency material to form an absorbent core 4. The absorbent core may contain from 0.2 to 50 wt.%, Preferably from 0.5 to 40 wt.%, More preferably - from 1 to 35 wt.% and most preferably from 3 to 30 wt.% of added oxidized lipids, the amounts being calculated based on the total weight of hydrophilic fibers, for example cellulosic fibers contained in the absorbent core.

In some areas, for example along the edges of the absorbent core, a larger proportion of oxidized lipids can be used than in the central zone of the absorbent core. In this case, the fibers in the edge zones can be more or less saturated with oxidized lipids and can function as barriers to leakage.

Different types of lipids affect the absorption properties of cellulose to a greater or lesser extent. For example, triolein, which is a monounsaturated fatty acid triglyceride such as oleic acid, does not reduce the absorption of liquid by treated cellulose to any higher degree, while the same amount of tristearin, which is a saturated fatty acid triglyceride, such as stearic acid, led to obvious hydrophobization of the treated cellulose. Accordingly, the amount of lipid added to the cellulose may vary depending on the lipids used.

Thus, oxidized lipids can be added to cellulose, typically fluff pulverized pulp used in the absorbent core 4 of the absorbent article. Alternatively or additionally, they can be added to the top sheet 2 or any additional functional layer contained in the absorbent article, such as a liquid receiving layer, a liquid distributing layer, a liquid holding layer, etc.

At least a portion of the treated cellulosic fibers in the core can only be distributed over specific zones in the absorbent core 4. For example, the treated cellulosic fibers are distributed in zones or arranged in zones in the form of spaced islands. The proportion of hydrophobic deodorizing material in the aforementioned islands in the core can be 25-35 wt.%, Calculated relative to the total weight of the hydrophilic fibrous material in the core in these zones or islands. In such zones, the proportion of oxidized lipids by weight may be greater than the situation in which the oxidized lipids are evenly distributed in the core, since a larger proportion of the absorbing liquid fibers by weight is present in the adjacent parts of the absorbing liquid of the core to compensate for the impaired absorption of the liquid by the treated cellulose fibers in these areas. The treated fibers can be mixed with other fibers and / or with materials with ultra-high absorption capacity in different ratios. The proportion of oxidized lipids should not be too high in the wetting zone, since they can impair the ability to absorb body fluid. The wetting zone is located essentially in the central crotch portion of the absorbent article.

At least a portion of the oxidized lipids may be contained in zones along the longitudinal lateral edges of the absorbent liquid of the core 4 and / or other functional layer. Odor can be absorbed by oxidized lipids when odors pass through the edges of the absorbent article. Smells can pass towards the side edges for many different reasons. There may be reasons for their evaporation, so that they will run towards the edges, the carrier of the product may move, so that ventilation will occur due to movements.

The proportion of oxidized lipids by weight in the zones along the longitudinal lateral edges can be relatively high, since it can be possible to reduce the ability to absorb fluids at the edges. In addition, it is preferable to have hydrophobic oxidized lipids along the transverse edges of the product, since in this case they can function as barriers to liquids and essentially reduce the risk of leakage.

In other embodiments, the treated fibers may be located in the absorbent core 4 in zones extending in the form of longitudinal strips along the article.

In a garment similar to a garment, such as diapers and a panty-like garment, the treated fibers may be located in the waist zone or in the areas around the leg openings. In this case, they can prevent the escape of odors from the product. Alternatively, oxidized lipids may be added to elastic means forming part of, for example, elastic elements for the waist or elastic elements for the legs in the absorbent article. The addition of a hydrophobic substance in the form of a skin care composition is described in document WO 2007/073270. The oxidized lipids of the present invention can be incorporated into elastic agents in a similar manner.

As in the absorbent core 4, the oxidized lipids can be uniformly distributed in any other layer in the absorbent article, such as a top sheet, a liquid receiving layer, a liquid distributing layer or the like. The proportion of oxidized liquid by weight in these layers may be the same as in the case of an absorbent core. Oxidized lipids can also be distributed over specific areas of these layers in the same manner as described with respect to the absorbent core.

The proportion of oxidized lipids will vary depending on the type of absorbent article. For example, panty liners for everyday use do not require as much deodorizing material as for incontinence products.

Smells in an absorbent article vary in character. To achieve an even better deodorizing effect in absorbent articles according to the present invention, other types of deodorizing materials or deodorant substances can also be used. They can be, for example, acidified cellulose fibers and / or materials with ultra-high absorption capacity with low pH. Cellulose fibers can be acidified, for example, by adding a buffer / acid. Acidic deodorizing materials act on odorous substances that are alkaline, such as amines and ammonia. If acid deodorizing materials are added in sufficient quantities, they are able to lower the pH of the pH and thereby counteract the growth / activity of bacteria, which in turn form substances that can contribute to the formation of a bad odor.

Other deodorizing agents, such as chitosan, starch-based deodorants and esters, may also be added to the product. The esters can be selected from cyclic esters or esters selected from isomethyl acetate, isomethyl propionate, isomethyl isobutyrate, isomethyl crotonate and isomethyl butyrate.

Oxidized lipids can be added to cellulosic fibers or other fibers in the production of fibers or can be added to manufacturing equipment in which absorbent articles are manufactured. Lipids can be oxidized either before adding them to the fibers, or after adding. In the latter case, the fibers, for example cellulose fibers, are treated with lipids and then the treated cellulose is reacted with an oxidizing agent, for example, ozone. In this case, ozone can also serve as a bleaching agent for cellulose.

EXAMPLES

Oil / Fat Ozonation

Ozone was generated in an Argenotox GL type Hamburg ozone generator, driven by a voltage of 150 V and an oxygen stream supplied at a speed of 63 l / h. 200 g of each tested oil / fat was treated for a period of 2 hours with an ozone / oxygen stream at a rate of 0.061 g / min. The ozone concentration in the added gas was 58 g / m ³ .

To obtain a more strongly ozonized sunflower oil in accordance with table 7, having a peroxide number of 276.9 meq / kg, ozone was blown through 50 g of oil for 5.5 hours

Ozone was purged through oil contained in a ventilated tank. A magnetic stirrer was used in the tank. Solid fats were subjected to smooth heating to a temperature above the melting point, after which the gas was purged through liquid fats. The tested oils / fats are those listed in table 3 below.

Table 3 Saturated Single saturated Multi-saturated Attitude
Desaturated /
saturated Sunflower oil eleven 28 56 7.64 Olive oil eighteen 70 12 4,56 Rapeseed oil 7 62 31 13.29 Corn oil 12 28 55 6.92 Cacao butter 61 36 3 0.64

The oxidation state was determined by testing by determining the peroxide number in accordance with the AOCS Official Method Cd 8-53 Surplus 2003 test method. The peroxide number was determined for both starting oils / fats and ozonized oils / fats. The results are shown below in table 4.

Table 4 Oil Peroxide value (meq / kg) Rapeseed oil 3.82 Ozonized rapeseed oil 42.09 Corn oil 4.21 Ozonated Corn Oil 60.04 Olive oil 7.99 Ozonated Olive Oil 61.41 Sunflower oil 7.10 Ozonated Sunflower Oil 65.49 Cacao butter 3.32 Ozonated Cocoa Butter 69.51

Oils / Fats Cellulose Treatment

Sulphate pulp sheets from Weyerhaeuser Inc. with the designation NB416 were impregnated with a solution of the test oil / fat in hexane. The solution contained equal amounts of hexane and oil / fat. The solution was evenly distributed over the surface of the sheets. When the hexane evaporated, the sheets contained 30 wt.% Oil / fat and 70 wt.% Cellulose fibers. The processed sheets were fiberized in a Braun MX32 universal mixer to produce fluff pulverized pulp.

Odor Reduction Analysis

1 g of treated cellulose was placed in a 60 ml tube, after which 3.9 ml of saline was added with phosphate buffer in an amount of 0.01 M and a pH value of 7.4 from Sigma. Then, 0.1 ml of PEG300 (polyethylene glycol) with DMS (dimethyl sulfide), DMDS (dimethyl disulfide) and IVA (isovalerian aldehyde) was added so that the total amount of all three unpleasant odors was 1000 ng / ml of each substance.

After 3 hours at 35 ° C, SPME fiber (Supelco), 75 μm Carboxen-PDMS, was introduced into the free space above the cellulose, and after another 0.5 hours, the SPME fiber was analyzed by gas chromatography (GC) using a Thermo Finnigan Trace chromatograph using MS detector. The peak area for each unpleasant odor substance was determined for samples treated with cellulose and untreated control cellulose. The settings of the gas chromatograph were as follows.

The temperature change program for a gas chromatograph: 30 ° C (7 min), 3 ° C / min - 70 ° C (0 min), 40 ° C / min - 25 ° C (7 min).

Column: ZB-624 (Zebron), 30 m, inner diameter 0.25 mm, film thickness 1.40 μm.

Inlet temperature: 250 ° C.

Transfer line: 220 ° C.

Mode: without dividing the stream.

Mass spectrometry: SIM (single-ion monitoring). In the analysis of dimethyl sulfide, isovaleriandehyde and dimethyl disulfide, the following mass numbers were revealed: 45, 46, 47, 57, 58, 61, 62, 79, 86, and 94.

Odor Reduction Results

Tests have shown that ozonized oils / fats had a significantly greater “decreasing” effect on unpleasant odors than the corresponding oils / fats that were not ozonized. Odor reduction results are shown in Table 5 below. Odor reduction was determined by comparing the peak area for the test sample with the same peak area obtained from the untreated control pulp test. Percent odor reduction was calculated using the expression:

Odor reduction = 100 × (1 - Actual peak area / Peak area for a sample with untreated pulp) [1]

Table 5
Decrease [amount] of odorless substances in% Dimethyl sulfide Isovalerian Aldehyde Dimethyl disulfide Sunflower oil 0 0 31.6 Ozonated Sunflower Oil 99.9 96.7 99.1 Cacao butter 35.1 0 48,2 Ozonated Cocoa Butter 79.8 50,0 59.1 Rapeseed oil 35.8 38.5 36.5 Ozonized rapeseed oil 99,4 96.2 91.2 Corn oil 87.1 66.0 88.4 Ozonated Corn Oil 99.9 96.4 99.6 Olive oil 84.0 69.2 73.0 Ozonated Olive Oil 99.9 97.7 95.9

Tests with different amounts of added oils having different peroxide numbers

Tests were carried out with treated cellulose, to which various amounts of ozonated sunflower oil were added, comprising 0, 3, 10 and 30% by weight, respectively. Two different ozonized sunflower oils were used, namely one having a peroxide number of 65.6 meq / kg and the other having a peroxide number of 276.9 meq / kg.

Cellulose was processed as follows.

A bleached Kraft pulp sheet with the trade name NB416 manufactured by Weyerhaeuser Company was treated with an oil dissolved in an appropriate evaporated solvent. The solution was poured onto 10 g of a sheet that absorbed liquid and ensured good oil distribution in the fiber network. After this, the solvent was evaporated by simply keeping the sheets at an indoor temperature for at least 3 hours. The following solutions were prepared.

a. Ozonated sunflower oil in an amount of 0.31 g with a peroxide number of 65.5, dissolved in 8.27 g of hexane. This addition means that the cellulose sheet will contain 3% oil.

b. Ozonated sunflower oil in an amount of 1.11 g with a peroxide number of 65.5, dissolved in 7.47 g of hexane. This addition means that the cellulose sheet will contain 10% oil.

c. Ozonated sunflower oil in an amount of 4.29 g with a peroxide number of 65.5, dissolved in 4.29 g of hexane. This addition means that the cellulose sheet will contain 30% oil.

d. Ozonated sunflower oil in an amount of 0.31 g with a peroxide number of 276.9, dissolved in 8.27 g of acetone. This addition means that the cellulose sheet will contain 3% oil.

e. Ozonated sunflower oil in an amount of 1.11 g with a peroxide number of 276.9, dissolved in 7.47 g of acetone. This addition means that the cellulose sheet will contain 10% oil.

f. Ozonated sunflower oil in an amount of 4.29 g with a peroxide number of 276.9, dissolved in 4.29 g of acetone. This addition means that the cellulose sheet will contain 30% oil.

After evaporation of the solvent, the oil-impregnated sheets were torn into pieces and separated into dry fibers in a Braun MX32 universal mixer. Fiber separation was carried out with maximum intensity until a fairly uniform fluff pulverized pulp was formed.

For comparison, a sheet of untreated bleached kraft pulp (NB416) was fiberized in the same way.

Chemicals used

Sunflower oil: food grade oil supplied by your local grocery store (Konsum)

Hexane: Pro Analysi, from Merck

Acetone: Puriss supplied by Fluka

Then the tests were carried out as described above. Their results are shown below in tables 6 and 7.

Table 6
Reduction of [amount] of odorless substances in% by adding ozonated sunflower oil having a peroxide value of 65.6 meq / kg The addition of ozonated sunflower oil (in wt.%) Dimethyl sulfide Dimethyl disulfide Isovalerian Aldehyde 0 0 0 0 3 50,4 21.7 0 10 95.8 73.3 73.3 thirty 98.7 93.5 86.7

Table 7
Reduction of the [amount] of unpleasant odor substances in% by adding ozonated sunflower oil having a peroxide value of 276.9 meq / kg The addition of ozonated sunflower oil (in wt.%) Dimethyl sulfide Dimethyl disulfide Isovalerian Aldehyde 0 0 0 0 3 94.6 55.6 92.8 10 100.0 95.2 92.9 thirty 100.0 100.0 96.0

These results show that adding a small amount of ozonated sunflower oil of 3% by weight can provide a strong reduction in odors from added substances and that an oil having a higher peroxide number provides a stronger reduction in odors. It may be noted that ozonated sunflower oils having peroxide numbers in excess of 1000 meq / kg are known in the literature. Therefore, it can be assumed that the addition of an oil having a high peroxide number in an amount significantly less than 3 wt.% Can provide acceptable odor control.

Odor test in practice

An odor test was also performed in practice, in which the people who participated in the test sniffed the samples after testing with gas chromatography. The following results were obtained.

Try Smell Control: Very strong foul odor 3% ozonated sunflower oil, peroxide value 65.5 Distinct odor, weaker than control 10% ozonated sunflower oil, peroxide value 65.5 Faint smell 30% ozonated sunflower oil, peroxide value 65.5 No bad smell 3% ozonated sunflower oil, peroxide value 276.9 Faint smell 10% ozonated sunflower oil, peroxide value 276.9 No bad smell 30% ozonated sunflower oil, peroxide value 276.9 No bad smell

Bacterial Growth Measurements

To measure bacterial growth, test liquid 1 was used: sterile synthetic urine, to which microorganism growth medium was added. Synthetic urine contained monovalent and divalent cations and anions and urea and was obtained in accordance with data from Geigy, Scientific Tables, vol. 2, 8 ^th ed., 1981, page 53. The microbial growth medium is based on two widespread growth media, Hook and FSA for enterobacteria. The pH of this mixture was 6.6.

A homogeneous mixture of fluff pulverized pulp was prepared as follows (method 1).

Untreated and treated pulp from Weyerhaeuser (NB416) was weighed in predetermined proportions and placed in a Braun MX32 universal mixer. Cellulose was mixed for approximately 30 seconds.

Absorbent test cores were made as follows (method 2).

Absorbent cores were prepared using a slightly modified sample formed in accordance with SCAN C 33:80. The fluff pulverized pulp of the specified type (s) was weighed and a uniform mixture of fluff pulverized pulp was injected into an air stream having a pressure below atmospheric of about 75 mbar through a pipe having a diameter of 10 mm and provided with a metal mesh at the bottom. The fluff pulverized pulp accumulated on a metal mesh and then formed an absorbent sample. The absorbent core was compressed to a volume in the range of 6 to 12 cm ³ / g.

Two different absorbent cores were made: a control core consisting of 2.0 g of untreated pulp from Weyerhaeuser (NB416), and a test core consisting of a mixture of 1.4 g of treated pulp from Weyerhaeuser (NB416) treated with oxidized sunflower oil with a peroxide value of 65.5 meq / kg in accordance with the method described above in the “Processing of cellulose with oils / fats” (added amount was 30 wt.% oil), and 1.0 g of untreated cellulose from Weyerhaeuser (NB416). The diameter of the absorbent cores was 5 cm.

The growth of bacteria in the absorbing cores was measured in the following way (method 3).

10 ml of test liquid 1 containing bacteria was added to the test core placed in a sterile vessel (100 ml Nunc sputum / organ vessels) and the lid was placed on the vessel. The vessel was turned upside down and placed for cultivation in a warm cabinet (thermostat) with a temperature of 35 ° C. After growing for 0, 6 and 12 hours, the test cores were placed in a plastic bag with peptone water, and the contents were given uniformity (by mixing and processing) in the Stomacker for 3 minutes. The homogenate was diluted in tubes for dilution with peptone water, and the microbiological culture was distributed over plates with agar medium. Slanetz Bartley agar was used for E.faecalis, and Drigalski agar was used for E. coli and P.mirabilis. Samples were grown at 35 ° C for 1-2 days before the number of microorganism colonies was determined, and the logarithm of the number of colony forming units per ml was calculated. Control tests were also performed with absorbent cores.

Test Results: Bacterial Growth

Bacteria were grown in nutrient broth and were diluted to a predetermined concentration of approximately log 3.3 in test fluid 1 (method 3). Absorbent test cores were made in accordance with method 2. Bacterial growth was measured in accordance with method 3.

Table 8 shows the results that clearly illustrate that the growth of all 3 bacteria used in the tests was significantly less after 6 and 12 hours compared to the control core.

Table 8 0 h 6 h 12 h pH Sample E.coli P.mir. E.faec. E.coli P.mir. E.faec. E.coli P.mir. E.faec. 0 h 6 h 12 h Trial 1 3,5 3.2 3.2 <2 <2 <2 <2 <2 <2 6.2 5.9 5,6 Trial 2 3.4 3.2 3.3 <2 <2 <2 <2 <2 <2 6.3 5.9 5,6 Test,
average value 3,5 3.2 3.3 <2 <2 <2 <2 <2 <2 6.2 5.9 5,6 Control 1 3,5 3.2 3.2 6.1 5,0 6.3 9.7 8.8 9.1 6.6 6.6 8.9 Control 2 3.4 3.2 3.3 6.5 5.1 6.2 8.8 7.8 8.1 6.6 6.6 8.6 Control,
average value 3,5 3.2 3.3 6.3 5,0 6.3 9.5 8.5 8.8 6.6 6.6 8.7

Claims (16)

1. An absorbent article, such as a sanitary napkin for everyday use, a napkin, a diaper, a diaper-panties, an adult incontinence guard, the article includes an absorbent core (4) and a fluid impervious back sheet (3), characterized in that at least one oxidized oil / fat is added to said product as a deodorizing substance, wherein said oil / fat is oxidized under a controlled condition and has peroxide the number determined by the AOCS method Cd method 8-53, which is at least 20 meq / kg. 2. The absorbent article according to claim 1, characterized in that the oxidized oils / fats have a peroxide number determined by the AOCS method Cd 8-53, which is at least 30 and preferably at least 40 meq / kg. 3. An absorbent article according to claim 1, characterized in that said absorbent core (4) contains hydrophilic fibers treated with said oxidized oils / fats. 4. The absorbent product according to claim 3, characterized in that at least part of these hydrophilic fibers are cellulose fibers. 5. Absorbent article according to claim 3 or 4, characterized in that at least 0.2 wt.% Of oxidized oils / fats calculated from the total weight of hydrophilic fibers contained in the absorbent core are added to said absorbent core (4). . 6. An absorbent article according to claim 5, characterized in that from 0.2 to 50% by weight, preferably from 0.5 to 40% by weight, more preferably from 1 to 35% by weight, is added to said absorbent core (4). % and most preferably from 3 to 30 wt.% oxidized oils / fats, calculated on the total weight of hydrophilic fibers contained in the absorbent core. 7. An absorbent article according to claim 1, characterized in that the article further comprises a liquid-permeable topsheet (2) and / or one or more additional functional layers selected from: liquid-receiving layers, liquid-distributing layers. 8. An absorbent article according to claim 7, characterized in that at least one oxidized oil / fat is added to the top sheet and / or to at least one of these additional functional layers as a deodorizing substance. 9. An absorbent product according to claim 8, characterized in that at least 0.2% by weight of oxidized oils / fats calculated from the total weight of said upper sheet and / or are added to said top sheet and / or additional functional layer. additional functional layer. 10. The absorbent product according to claim 9, characterized in that to the specified top sheet and / or additional functional layer is added from 0.2 to 50 wt.%, Preferably from 0.5 to 40 wt.%, More preferably from 1 to 35 wt.% And most preferably from 3 to 30 wt.% Of oxidized oils / fats, calculated on the total weight of the top sheet and / or additional functional layer. 11. The absorbent product according to claim 1, where the specified product has longitudinal (y) and transverse (x) directions, two longitudinal edges (6, 7) and two transverse edges (8, 9), characterized in that the deodorizing substance is in the form oxidized oils / fats are found in larger quantities in areas close to the longitudinal and / or transverse edges of the product than in the central zone of the product provided as the fluid receiving zone. 12. The absorbent product according to claim 1, where the specified product includes elastic means, for example, elastic elements for the legs and / or waist elastic elements, characterized in that at least one oxidized oil / fat is added to the specified elastic means. 13. The absorbent product according to claim 1, characterized in that the oils / fats are fatty acids or their derivatives. 14. The absorbent article of claim 13, wherein the fatty acid derivatives are fatty acid esters, preferably triglycerides. 15. The absorbent product according to item 13 or 14, characterized in that at least part of the fatty acids and / or derivatives of fatty acids are unsaturated. 16. The absorbent product according to claim 1, characterized in that said oxidized oils / fats are oxidized by treatment with ozone.

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