DE1642072B2 - SUCTION BODY - Google Patents

Description

The invention relates to an absorbent body with a carrier and a finely divided, water-insoluble, polymerized hydrocolloid as absorbent for medical and hygienic purposes. This absorbent body is used in particular for absorbent bandages or the like, but especially for diapers, sanitary napkins and tampons and also for wound dressings.

The object of the invention is to create a liquid wedge lufnehmenden absorbent body in which the existing absorbents essentially finely divided hydrocolloid yo at ambient temperature is substantially insoluble in water, is capable of (1), body exudates, such as normal liquid body exudates as well as exudates from wounds in To absorb amounts of at least 15 to about 70 times its own weight, (2) to hold the absorbed exudate in these amounts under the normal bending and pressure effects that can be attributed to the movements of the person wearing the bandage or the like, and ( 3) to maintain its finely divided state, even if the hydrocolid is severely swollen as a result of the ingestion of body exudate.

In the case of a liquid absorbing absorbent body of the type mentioned in the introduction, this object is achieved in Surprisingly solved in that as an absorbent a crosslinked polyacrylamide or a crosslinked sulfonated polystyrene or a mixture thereof is used.

As a result of the way in which the body exudate is absorbed by the finely divided hydrocolloid component which is used in the absorbent dressing according to the invention (when absorbed, the substance swells while maintaining its fineness), the surface of the moisture-saturated dressing feels dry. Due to this fact Jowie due to the ability to retain the absorbed liquid even at normal movements of the person wearing the absorbent dressing of the invention is od. Like. For all intended purposes, especially for diapers, especially for <, ₀ certain to be thrown away after use Diapers are particularly suitable as well as for women's tampons. The dressing according to the invention from the od. Like. Manufactured article are relatively small compared to the amount of the liquid Körperausschei- _tl <dung, which can be taken hicidurch.

A erfmdungsgemäße diaper can absorbed ci ".- \ - i ^{^.!..} '' Pter a ¹ V ₁ ick of up to 0.1 S atmospheres in an amount of at least 30 times the weight of the finely divided hydrocolloid component absorb and hold.

In use of the diaper according to the invention can as a result of the child's movements, a relatively particularly high pressure temporarily occurs, so that some absorbed liquid is released from the absorbent. Even if some absorbent particles are fully saturated under the applied pressure, those in their vicinity can existing absorbent particles, which are not yet fully saturated, absorb additional liquid, so that the diaper is essentially dry to the touch at all times during normal time of use.

In an absorbent body according to the invention, this is essentially water-insoluble, finely divided, hydrocolloid Absorbent, the particle size of which is expediently in the range from about 1 μ to 2 mm, see above evenly distributed as possible on and / or in a flat carrier, as is usually the case in absorbent bandages or the like. Is used, so that the carrier and the applied thereto, finely divided layer in the usual manner to form a predetermined absorbent article according to FIG Invention can be processed. The finely divided absorbent is between two sheet-like Arranged carriers and then od in the usual manner to form an absorbent bandage Invention processed. This ensures that the consisting of discrete hydrocolloid particles Layer od in the finished association. The like. Is embedded. You can do this with a ladies tampon achieve that the hydrocolloid particles as a layer on a conventional layer of absorbent fibers and then the latter layer is wound up into a roll so that the hydrocolloid particles be held between the winding layers.

The hydrocolloid absorbent used according to the invention can be coherent, for example consist of fibers or a thin film or have a cell structure. In all these forms have a large surface area. Preferably, however, the absorbent is in finely divided form, for example in flakes or as granules, because this is the most specific form Absorption surface is available. The hydrocolloid absorbent should be used in an amount of at least about .5 weight percent, preferably 10 to 15 weight percent, of the total weight of the in the Bandage contained absorption medium is used. For a diaper or a wound dressing the absorbent component can be practically completely composed of the hydrocolloid described above Absorbents exist.

| e according to the special type of the desired bandage or hygiene fabric or the like, the sheet-like carrier for the finely divided hydrocolloid layer can consist of an absorbent mass or layer of textile fibers, cellulose fibers, cotton linters and mixtures of such fibers or of one or more layers of interconnected textile fibers, namely synthetic or natural fibers or a mixture thereof. A composite body made of layers of absorbent, soft paper z. B. soft crepe paper, paper layers and waterproof films and fiber roff layers! ^; n F-npc. the possibly nerfo-

■ Can be ated so that liquids can pass through freely. As already stated, in the The same sheet-like carrier is used in the absorbent bandage xLdgL according to the invention «Ground as in usual absorbent bandages 3d. like

The water-insoluble, finely divided hydrocolloids used in accordance with the invention are substances known per se which, however, have not previously been used for the purpose according to the invention, ie as absorbents in absorbent dressings or the like, in which the absorbent retains its finely divided nature, when it soaks up and absorbs the surrounding liquid in an amount corresponding to a multiple of its weight and swells in the process. As described above, the absorbent, water-insoluble, finely divided hydrocolloid used in the present invention can absorb water or body exudates in an amount of about 15 to 70 times its weight. Each individual absorbent particle swells by several hundred percent of its dimension without the integrity of the particle being impaired. The finely divided, water-insoluble hydrocolloid essentially fixes the liquid it absorbs. The finely divided substance swollen as a result of the absorption of liquid has a gelatinous consistency.

The mass of swollen, water-insoluble hydrocolloid particles contained in the dressing or the like has a grape-shaped structure. Because every single absorbent particle is due to the absorbed The liquid is very swollen and therefore grape-shaped. The swollen hydrocolloid particles are sticky and therefore form an agglomerated mass in the absorbent bandage or the like. The particles retain this grape-like structure even when there is more liquid than they absorb can.

The hydrocolloid particles swollen as a result of the uptake of liquid bind what they have absorbed However, water, as already stated, is dehydrated on drying, whereby it is more or less to return to their original size. After that they are more or less to the again Suitable for absorbing and binding liquids, so that, for. B. a diaper according to the invention in an emergency can be used again for the first time.

The water-insoluble hydrocolloid particles used according to the invention are known substances, generally a hydrocolloid polymer whose molecular structure consists of about 25 to 72% of hydrophilic groups and whose polymeric network is crosslinked in such a way that the molecule has limited water insolubility. Water-insoluble, hydrocolloid _s ? Absorbents have an average molecular weight of at least about 13,000 and no more than about 276,000 per intermolecular bridge. The degree of crosslinking is generally chosen so that the polymeric network of the hydrocolloid in ^ ₀ water or other liquids in question is not soluble, but remains flexible and swells on absorption of water or other liquid. As the hydrocolloid swells, it retains approximately the geometrical shape it had before contact with the liquid, but its dimensions are greatly enlarged so that it can capture and hold the absorbed liquid.

The absorbent dressings or the like according to the invention, which contain water-insoluble, hydrocolloid absorbent particles, differ from the known absorbent bandages or the like, the natural and / or synthetic, water-soluble Contain hydrocolloids, the purpose of which is to thicken the liquid absorbed by the absorbent dressing or to increase its viscosity.

The crosslinked, water-insoluble, finely divided hydrocolloids used according to the invention are the known natural hydrocolloids, for example agar-agar, karaya gum and water-soluble gum resins (tragacanth, gum arabic, carubine, guar resin, as used in accordance with US Pat. No. 3,070,095) and the synthetic hydrocolloids used up to now, for example carboxymethyl cellulose and carboxyethyl cellulose, are completely unequal. The soluble hydrocolloids mentioned serve only to increase the viscosity of liquids and lose their ability to maintain the previously achieved viscosity in the presence of excess liquid. In contrast, the crosslinked hydrocolloid absorbent used according to the invention swells z. Example, in a diaper in the absorption of liquid and retains the absorbed liquid, so that it can not be released again. The swollen hydrocolloid is substantially retained in the diaper and does not leak through the boundary layers of the diaper. The liquid absorbed by the swollen mass is well held under the pressures occurring during use. Even with an excess of liquid, the liquid-swollen hydrocolloid, consisting of discrete, separate particles, maintains its maximum swollen size.

The water-insoluble, hydrocolloid absorbent used in the present invention is a crosslinked one Polyacrylamide or a crosslinked sulfonic polystyrene or a mixture thereof.

The hydrolyzed polyacrylamides used according to the invention as hydrocolloid absorbents have the following structural formula:

CH ₂ -CH-

C = O C) Y

-CH- O 1 I.
/ ^ / NH ₂ \ 'CH ₂ V

It means:

Y is a hydrogen, ammonium or alkali metal ion,

m is a number from 1 to 100,

η a number 1 indicating the degree of hydrolysis from 0 to 100, where m + η is 100, and

Z is a number from 1 to 30, where one hundred times Z equals the number of between the intermolecular bridges present polymerized units.

The existing of a crosslinked polyacrylamide employed in accordance with the invention, the hydrocolloid may be manufactured in known manner, for example by crosslinking a linear 2. Poiyacrylamids (or by copolymerizing an ;, Ac ylamids ^r) with Ainet

non-conjugated divinyl compound, e.g. B. methylenebisacrylamide. In the latter case, the polymerization can be carried out by any conventional method , whereby peroxide catalysts can be used, or in the case of light-catalyzed polymerization with riboflavin as an activator. The crosslinking agent can be used in an amount from about 500 to about 5000 Parts per million of the polymer will be present.

Other examples of non-conjugated divinyls useful as crosslinking agents are

1,4-divinylbenzene;

Ν, Ν-diallylacrylamide;

Diallylamine;

Diallyl methacrylamide;

2,5-dimethyl-1,7-octadiene;

p, p'-diisopropenylbenzene,

2,8-dimethyl-1,8-nonadiene and

Diethylene glycol divinyl ether.

Of the polyacrylamides of the general formula mentioned, those which are hydrolyzed and in which Y is a sodium or potassium ion, η is a number from 10 to 70 and Z is a number from 2 to 20 are preferred. In particular, Y should preferably be sodium and η and Z numbers from 20 to 40 or 4 to i 5.

Of the crosslinked polystyrene sulfonates which can be used as hydrocolloid absorbents in the context of the invention those obtained with nonconjugated divinyl compounds of the above are preferred specified type are networked. These polystyrene sulfonates are known and have the following structural formula:

—C - C - Λ. H \ X 'SO, Y ⁴

In it means

Z is a number from 100 to 3000 indicating the number of units between the intermolecular bridges and

Y is a hydrogen, ammonium or alkali metal ion.

These crosslinked polystyrene sulfonates are produced by known methods, e.g. B. by copolymerization of styrene with a non-conjugated divinyl compound such as divinylbenzene in the presence of a Polymerization catalyst, e.g. B. benzoyl peroxide. It is common to add a suspension stabilizer, e.g. B. Gelatin or polyvinyl alcohol, so that small polymer beads of about 1 micron to about 2 mm can be formed. This is used to sulfonate the polymer formed in this way heated to a temperature of about 100 ° C in the presence of concentrated sulfuric acid

The effect by which the water or other liquid passes through the front cover layer of the The absorbent bandage according to the invention or the like to the hydrocolloid contained therein Absorbent is commonly referred to as a wicking effect. This effect is commonly used brought about by fibers contained either in the cover layer or in the absorbent are. These fibers form channels through which those on the surface of the absorbent bandage or the like. Liquid located in the bandage 5 or the like. Contained, hydrocolloid absorbent got. According to the invention you can use both at the same time, depending on which composition for the top layer is desired and whether the hydrocolloid should be the only absorbent or with

ίο absorbent fibers can be combined.

The hydrocolloid absorption medium used according to the invention can consist of a mixture of the Hydrocolloids consist of a fiber mass or together with several layers of absorbent, soft paper, e.g. B. soft crepe paper, form a composite body.

Embodiments of the invention in the form of a diaper, a bandage for Surgical wounds and bandages, namely a tampon and a sanitary napkin, using the Drawings explained. In these shows

Fig. 1 diagrammatically, partially cut away, a

Diaper or wound dressing according to the invention, Fig. 2 is a cross-section along line 2-2 of the Fig. 1,

Fig. 3 od in the same cross section as FIG. 2 the bandage. Like. After use and the Absorption of body exudates,

4 in a perspective view, partially cut open, another embodiment of a diaper or a dressing for surgical wounds according to FIG Invention,

5 shows a cross section along the line 5-5 of FIG. 4,

Fig. 6 in the same cross-section as Fig. 5 od the bandage. Like. After use and the Absorption of body exudates,

Fig. 7 is a perspective and partially opened Sanitary napkin according to the invention,

8 in perspective and partially open one Women's tampon according to the invention,

9 shows a cross section along the line 9-9 of Fig. 8,

F i g. 10 and 11 other embodiments in plan view of a tampon material before its deformation zi tampons,

12 shows a tampon made from the material according to FIG. 11, which is used to illustrate details is partially cut open, and

13, in cross section, an absorbent bandage or the like, which, in order to determine its properties has been checked.

Fig. 1 shows a diaper 1 which is intended to be thrown away after use. The front cover layer 2 consists of a porous nonwoven fabric made of individual fibers which are bound with a binding agent which is applied in places, the binding agent areas being arranged in a pattern at a distance from one another. The lower cover layer 4 is impervious to moisture

casual and consists z. B. made of a thin polyethylene Movie. The upper cover layer 3 and the lower cover layer 4 are at their common edges f connected to one another by a suitable adhesive. The absorbent is in this winch from a fiber material layer 9 made of absorbent fibers 7, e.g. B. cellulose fibers. Layer 9 is there; above, hydrocolloid Absorptionsmit tel 8 distributed irregularly. The upper cover layer 3 unc

the lower cover layer 4 serves as a carrier in this diaper.

The upper cover layer 3 can, for. B. consist of soft, absorbent paper or a light nonwoven fabric, which is intermittently bonded or impregnated in its entirety, made of a thin, perforated one Plastic film or other suitable material that is well permeable to liquids and has a smooth, soft surface for contact with the human body.

The fiber material layer 9 is preferably with a lower cover layer 4 made of a waterproof Material, for example a layer of waterproof paper, a thin, water-repellent film etc. provided. The upper and lower cover layers 3 and 4 are attached to one another at their longitudinal edges, so that the layers cannot move against each other. The top layers 3 and 4 cannot any known method can be attached to one another, for example with adhesive, by edge embossing etc.

The finely divided, hydrocolloid absorbent 8 can be applied to the fiber material layer 9 be by z. B. the hydrocolloid absorbent scattered or dusted in the fiber material layer will.

The fiber material layer 9 can of course also consist of several layers of absorption material exist. In this case, the hydrocolloid absorbent 8 with the surface of an or several layers of i'er are glued. The fiber material layer 9 can consist of any absorbent, for example shredded cellulose, Fabric, cotton linters, several layers of soft crepe paper and the like.

To fix the hydrocolloid in a diaper or an absorbent bandage, however, one can also emboss in the surface of the fiber material layer 9 indentations, for example the shape of parallel, strip-shaped grooves or a rhombic shape and the hydrocolloid Absorbent 8 included, so that a substantially uniform distribution is ensured.

Fig. 2 shows in cross section along the line 2-2 of the F i g. 1 the fiber material layer 9, which consists of absorbent fibers 7. Particles of the hydrocolloid Absorbents 8 are attached to the fibers or mechanically mixed with them. The top cover layer 3, which can consist of one or more layers, and the water-repellent, lower cover layer 4 surround the fiber material layer 9 and hold them together. Layers 3 and 4 are on theirs common edges 6 connected to one another by an adhesive 10.

F i g. 3 shows in the same cross section as FIG. 2 the diaper according to the invention after use, after a corresponding liquid absorption has taken place. The hydrocolloid absorbent is swollen and forms clusters 11, with the particles in the keep their special shape in the swollen state. The fibers 7 of the fiber material layer 9 support the maintenance of the essentially even distribution of the swollen from the liquid, hydrocolloid absorbent consisting, gelatinous mass over the length and width of the Diaper. A fiber material layer 9 is not necessary if with the help of suitable methods, for example by embossing, a substantially uniform distribution of the hydrocolloid absorbent practically is guaranteed. In this case, the above-mentioned hydrocolloid essentially forms only the absorption medium. The absorption medium can consist entirely of the hydrocolloid exist when absorbent carriers are not used.

FIG. 4 shows a second embodiment of an absorbent bandage or the like according to FIG

ίο Invention in the form of a diaper 12. This has a upper and a lower cover layer 3 and 4, as shown in FIG. 1. The absorption medium here, however, consists of a layer of a hydrocolloid absorbent 5 in the form of fine

is flakes. These are distributed essentially uniformly over the inner surface of the lower cover layer 4 and are held in place by an adhesive layer 14 which has previously been applied to the inner surface of the lower cover layer 4. A thin layer 13 of cellulose is attached to the inner surface of the upper cover layer 3 so that the diaper 12 has a "wicking effect". The more precise structure of the diaper can be derived from the example shown in FIG. 5 shown cross section along the line 5-5 of FIG . 4 see. The lowermost layer of the hydrocolloid absorbent 5 is connected to the inner surface of the lower cover layer 4 with adhesive 14. The cellulose layer 13 helps hold the hydrocolloid in place in the form of an absorbent core. The pulp layer 13 is attached to the inner surface of the top cover layer 3.

Fig. 6 shows in one of the F i g. 5 similar Cross-section of the diaper 12 after use, with body exudate being absorbed. The hydrocolloid Absorbent 16 is swollen by the absorbed liquid and has the for this condition characteristic, gelatinous, grape-shaped structure. The gelatinous mass 16 forms a practically uninterrupted layer that extends the full length and width of the diaper, and becomes relative in its Flat position held in place by embossed depressions 15 in a substantially uniform pattern are distributed over the diaper. With the help of adhesive 14, the lower 4 and the upper cover layer 3 are in the Wells 15 interconnected so that the absorbent kept reasonably flat and the Tendency of the gelatinous mass 16 of the absorbent to agglomerate in the center of the sheet is suppressed. The pulp layer also helps to set the gelatinous mass in their location so that the diaper maintains its flat shape.

The diapers according to FIGS. 1 to 6 could also be bandages for surgical wounds or the like or others represent absorbent plasters or bandages. Only the size of the bandage is relevant to reduce. The bandage remains able to absorb and hold body exudate.

F i g. Figure 7 shows a sanitary napkin 40 according to the invention having a relatively thick, absorbent Core 18, which is surrounded by a liquid-permeable fiber shell 12, the ends of which practice the ends of the absorbent core 18 extend out and the usual attachment ends 13 form. The absorbent core 18 can be about 20 cm long, 6 cm wide and 6 to 13 mm thick and consists of ir in this case from a layer 19 of the finely divided hydrocolloid absorbent described above. This layer is between several

Fiber material layers 15, for example, made of cotton fleece, cellulose fiber fleece lying loosely one on top of the other (»Air-layered cellulosic fiber webs«), nonwovens, cellulose wadding, cellulose for the production of which paper or the like, arranged very absorbent substances. The whole core is from that liquid-permeable sheath 12 surrounded. You can also use the hydrocolloid absorbent 14 via the throughout the absorbent core 18 irregularly distribute.

FIGS. 8 and 9 show a women's tampon 21 according to the invention with an elongated, cylindrical core 22 of tightly packed, absorbent Fibers enclosed by a liquid-permeable sheath 23. There are two at the end of the tampon Straps 24 are provided with which the tampon can be handled. The one from the absorbent Core made up of fibers has a weight of 12 percent by weight of the total weight of the core and of the hydrocolloid absorbent 20 distributed therein.

Fig. 9 shows on a larger scale in a cross section along the line 9-9 of FIG. 8 the Arrangement of the finely divided hydrocolloid 20 in the core 22 of absorbent fibers, which is of the liquid-permeable sheath 23 is surrounded.

10 and 11 show in plan view other embodiments of tampon material before it Deformation to tampons. According to the two figures, an absorbent cover layer 30 carries the layer 31 of the hydrocolloid absorbent described above and the layer 32 for retention of the absorbent. The two layers 30 and 32 are made of fiber fleece and are liquid-permeable. However, you can also use other substances that are suitable for the absorption of liquids, For example, paper, textile fabric or the like. One or the other of the layers can also not be made of one Produce absorbent material and provide larger or smaller openings, for example a perforated polyethylene film can be used as such a layer.

The tampon material shown in FIG. 10 becomes a tampon is made by folding one of the longitudinal edges and then rolling the material further, see above that a cylindrical tampon is created. This is then pressed and the free edge with glue set. The same applies to the tampon according to FIG. 11. In both cases the arrows indicate the processing movement. Each tampon has pull-out tapes 33 that attached to the composite body by a seam 34 or in any other suitable manner.

Fig. 12 shows a tampon made of the material according to Fig. 11. The middle part of the tampon is cut away, so that the distribution and arrangement of the material can be seen

The absorbent bandages, diapers, sanitary towels, tampons according to the invention have one over against the previously known articles of the same type greatly improved absorption and holding capacity for liquids. Sample dressings were used to demonstrate this improved absorption and retention capacity for liquids manufactured as follows: Several absorbent dressings for testing 254 χ 254 mm were made by adding congruent layers of nonwoven fabric 26, fiberized pulp 27 and a hydrocolloid substance 28 according to the method described in P i g. 13 cross-section shown were superimposed. The layers of nonwoven weighed 1 g each, the layers of cellulose each weighed 3.3 g and the layers of the hydrocolloid absorbent 0.5 g each. For control purposes, a dressing was made which did not contain any hydrocolloids of the absorbent contained.

Each dressing was saturated with 500 ml of deionized water. Each bandage was lan for 3 minutes; held at a slope of about 45 ' ^J Das au; Any water leaked from each bandage was collected

ίο gen and measured.

After a period of 5 minutes for there; The escape of water was a level pressure of 0.09 atm applied to each bandage. The water that emerges from every bandage under this pressure

is was collected and measured. Which absorbs " The amount was calculated by calculating the difference between the amount of water added and that under the the aforementioned conditions, the amount of water collected is determined. The results are shown in Table i

> o reproduced. The letters m, n, i and Y here have the same meaning as in the structural formula for the polyacrylamides used according to the invention. Methylene-bis-acrylamide was used as a crosslinking agent.

Table I.

Absorbent absorbent m η 7 Y absorption Absorp ions "! (Kon- - in mil under tion in mil more capable 'troll- a print under ⁵⁰ association verb.) from 0 atü one 2 1 99 - ·) ι Κ pressure 3 54 46 5 K from 4 TI
40 ⁿ '- 28 10 N / A 0.09 atü (1 5 100 0 5 197 87 6 69 31 4 N / A Cross-linked sulfonated N / A Polystyrene 325 192 383 237 400 252 273 125 365 222 228 120

*) Cross-linked under irradiation.

The absorbent bandage or the like according to the invention has only one on the top cover layer extremely reduced or minimal surface wetness. This upper cover layer is made of textile or paper-like Material and the surface of the human body closest or directly to the source of the liquid, which the bandage or the like is supposed to absorb, exposed

Layer. This property of the association or the like goes clearly emerged from the test described below, in which two diapers of the same construction were used became. Each diaper measured 254 χ 254 mm. The absorption-capable upper and lower cover layers had

a weight of 15.5 g / n * Each diaper had a layer of fiberized cellulose with a weight of 12 g. bs, however, was only in one of the diapers is a crosslinked polyacrylamide hydrolyzate in an amount of 1.5 g m the group consisting of the absorbent fibers

i »distributed. In this crosslinked, hydrolyzed polyacrylamide, n, m and Z were 28, 72 and 10, respectively, and Y was Na in the structural formula given above. As a networking center! was methyl

len-bis-acrylamide used. 150 ml of deionized water was placed on each of the horizontally arranged diapers. The hydrocolloid substance was contained in diaper A but not in diaper ß.

In the first test, identical, thin layers of towel paper were laid flat on the top cover layers of both diapers and a thin, flat metal plate weighing 5.9 kg was placed on each of these stacks. After 5 minutes, the panel and toweling paper were removed from the diaper and the paper was reweighed to determine water absorption. The ratio of the surface water absorptions of the usual absorbent not according to the invention in the form of the crosslinked, hydrolyzed polyacrylamide-containing diaper B and the diaper A containing this absorbent was 4: 1.

In a further test, the top cover layer was carefully removed from both diapers and weighed to determine their fluid content. The ratio of the moisture contents of the upper cover layer of the conventional diaper B, without the hydrocolloid absorbent and the upper cover layer of the diaper A containing said absorbent, was 3 ¹ /:: 1.

Another very important property of the absorbent cloths according to the invention, diapers, sanitary towels, tampons or the like consists in the reduced spread of the absorbed liquid inside them. To demonstrate this property, diapers according to the invention according to FIG. 1 manufactured. Several of these diapers contained the specified hydrocolloid absorbent, which in the present case consisted of hydrolyzed polyacrylamide crosslinked with methylene-bis-acrylamide with n = 28, m = -72, Z- 10 and Y = Na. Other diapers have been made without this hydrocolloid. On the middle of each of these a structure according to FIG. 1 diapers were given 50cm ^J colored water. The proportion of the hydrocolloid absorbent was 0, 16 or 31 percent by weight of the diaper. The results were expressed in terms of the percentage reduction in the area of spread over the diaper which did not contain the hydrocolloid absorbent.

Weight percentage speed Percentage Ab Hydrocolloid the addition of water exception cellulose spreading area in the compared to the Pulp with 0% cmVsek Hydrocolloid 0 1.6 0 16 1.6 46 31 1.6 72 0 8.3 0 16 8.3 36 31 8.3 45

From these results it can also be seen that at lower addition rates, the inventive The diaper can absorb the water better before it flows past, so that the percentage of spreading area is reduced.

Here / u 4 sheets of drawing lines

Claims (2)

Patent claims: 1. Absorbent body with a carrier and a finely divided, water-insoluble, polymerized hydrocolloid as an absorbent for medical and hygienic purposes, characterized in that that the absorbent is a crosslinked polyacrylamide or a crosslinked sulfonated one Polystyrene or a mixture thereof is used. ι ο 2. Absorbent body according to claim 1, characterized in that the absorbent is an average Has a molecular weight of at least about 13,000 to at most about 276,000 per intermolecular bridge.