CELLULOSE FIBERS WITH STORED ACRYLIC POLYMER AND WITH HIGHER ABSORPTIONSFAHIGKEIT

© RK PATENT SPECIFICATION ® No. of 346456 ® patentees: AKZD NV ARNHEM the NETHERLANDS © article: CELLULOSE FIBERS WITH STORED ACRYLIC POLYMER UN of MITHOHER ABSORPTION CAPACITY ®Zusatz to patent No. ffiflAusscheidung out: @©Angemeldet to: Q|) Exhibition priority: @@ (|l) Unionspriorität: 1976 11 09, ti308/76 @ beginning of the patent duration: Longest possible duration: @ spent to: Horizontal stabilizer inventor: 1978 03 15 1978 11 10 of ALL THOMAS CLARK ASHEVILLE United States /USA DENNING DAVID BERRIE ASHEVILLE United States /USA © dependence: SO CO CO < (|g) Block letters, which were considered for the demarcation of the conditions of the technology: DD-PS76067GB-PS1430634 - 2 - Nr.346456 the invention concerns fibers with high absorption capacity, e.g. Viscose rayon Bayon, Hydroxypropyl cellulose and Hydroxyäthylcellulose, which are made of cellulose or other cellulose Materiallen and for production by fleece material articles such as diapers, Tampons, lady binding, medical Tupfern, Bodenmulchen, wiping cloths etc. are suitable. In each of these operational areas a Mate-5 rial with a pronounced ability, water and other aqueous liquids, in particular body fluids, to absorb and restrainable, needed. In these and similar areas of application cellulose fibers find because of the hydrophilic behavior of the Cellulosemoieküls and its fiber-like structure, which lend co-operation, form, absorbency and liquid support ability to the fleece material, to large extent use. 10Einige of examples of attempts to increase the absorption capacity from Rayonfasem to are contained in of the FR-PS No. 2,216. 387 as well as in the US-PS No. 3, 844.287, in accordance with which alkali metal and ammonium salts of the Polyacrylsäure into regenerated cellulose are stored, in order to increase the liquid absorption capacity of the Rayonfasern made of it. A further example of the storage of hydrophilic polymers in viscose rayon for the improvement of the hydrophilic behavior of the fiber is sentence of Carboxymethylcellulose and Carboxyäthyl - strength, as it in the US-PS No. 3.423.167, and/or No. 3.847.636, is descriptive. It is already well-known that the water absorption ability of a material depends on the degree of its Hydrophilie. With regulations of the water absorption ability like the determination of the source value and the Wasserrückhaltevermögens after hurling one can assume these depend on the degree loni sierung. The more highly thus the acidity of a material stored into a fiber is, the more largely is their absorption capacity. In case of of Polyacrylsäure one became thus due to its acid, i.e. to assume higher compared with Polymethacrylsäure, that Rayonfasem was injected, into the Polyaciylsäure, a higher Wasserrückhaltevermögen it possesses lonisationsgrades than fibers, which contain Polymethacrylsäure. This was also proven, how was to be still demonstrated later. 25Ein problem, which arose during the storage of the anionischen hydrophilic polymers into the cellulose fibers, forms the negative effect on the Kardierverhalten. An important characteristic, which fibers must exhibit, which it are to be used in the ranges, in particular with the production of Tampons, specified above, are the Kardierfähigkeit on conventional Karden. It was stated that during the storage by Polyacrylsäure in viscose rayon Rayon fibers in a Ihjektionsverfahren the co-operation of the volume is substantially reduced. The adhesion characteristics are however of great importance with the industrial processing from Rayonfasem to useful products such as Tampons. If the adhesion is too small, the synthetic material does not hold together, so that a decrease of the production speed or other changes of process is necessary or the fiber does not let itself process any longer. Therefore a substantial goal of the invention is the production of a Rayonfaser with improved liquid absorption without an excessive decrease of the fiber adhesion with you difficulties resulting in from it with the Kardierung of the fibers for the production of customs articles. It was now stated that alkali metal or ammonium salts of certain copolymers continues to improve the absorption and Rückhaltevermögen of Rayon with injecting into the viscose rayon and that 40 a fiber with a stronger adhesion than with lets itself manufacture in this way the well-known materials mentioned above. The adhesion is extremely important under the aspect of the fiber transportation in the Karde before the production of commercial finished products from the fiber. It is not well-known, why the copolymers exhibit a stronger adhesion in accordance with the invention opposite Polyacrylsäure. One of the factors, by which the fiber adhesion is substantially affected in general opinion, is the strength of the 45 ripples in the fiber. However both the copolymers in accordance with the invention and polyacrylsäure with increase of the quantity stored into the fiber lead to a decrease of the ripples. A further factor, which is considered important in connection with the fiber adhesion, is the surface connection of the fiber. This surface connection, which is present with normal cellulose, is to possibly be to due to hydrogen bonds and the stiffness of the fiber. The surface being 50 fertilize as the most important effect of the invention one regards, which its cause has possibly in the increase of the glass transition temperature (Tg) of the copolymer by the Methaciylsäure. It was found that the interference of Alkalimetall-und ammonium salts improved by copolymers from Aciyl and Methacrylsäure gesponnenen into the viscose rayon solution of the absorption and liquid support ability of the fiber made of it and against all expectations the preservation of the adhesion of the 55 from the viscose rayon fiber in a measure effectuation that the fiber without difficulties can be processed on the Karde, while the fibers mentioned above, which Polyacryl säurenatriumsalzen the same quantities of contain, did not let kardie ren itself on conventional Kardieranlagen in satisfying way. The invention concerns from there cellulose fibers with stored acrylic polymer and with high off - 3 - Nr.346456 sorption ability, which is suitable such as diapers, Tampons, lady binding, medical Tupfern, Bodenmulchen and wiping cloths for production by fleece material articles, which are characterized by that into the cellulose an alkali metal or an ammonium salt of a copolymer from acrylic acid with Methacryl acid is stored. 5Die fibers in accordance with the invention are received, by one a copolymer quantity between 2 and thread - %, related to the weight of the cellulose in the viscose rayon solution (all percentages on this basis are indicated in the following and called CIV), to any time of viscose rayon aging adds, preferably however by injecting into the viscose rayon solution fully developed. The range between 10 and 20% CIV is preferred according to invention, because a Ausgewogenlieit between er-10 is given to höhtem absorptive capacity and processing conditions here. The copolymer containing viscose rayon solution then by the openings of a spin nozzle into a Säurebad eingespomien and/or extruded, where the cellulose fiber is regenerated. The regenerated fiber is led in air around 0 to 100%, or, if desired, still more strongly draws, preferably however around approximately 30 to 50%, and then by a hot aqueous bath, which exhibits a temperature between the ambient temperature and lOO0^ preferably je-15 nevertheless between 90 and 970C. The hot aqueous bath contains different quantities diluted sulfuric acid, ZnS04 and sodium sulfate. In the hot bath the fiber is drawn again around 0 to 100%. The total drawing from both stages preferably lies between 50 and 70%. As is common knowledge, lends drawing the finished fiber is the necessary firmness. The threads, which are present now in form of a thick bundle of endless filaments, and/or a cable from the total production 20 of a set of spin nozzles, are cut, washed into short fibers with the desired length and dried up to a moisture content of approximately 11% and packed in bundles. After recovery of the fiber in the Säurebad the copolymer in acid form, included into the fiber, is present. In order to achieve the highest absorption capacity, the copolymer must be present however in form of the alkali metal or ammonium salt. The transformation of the copolymer from acrylic acid and Methacrylsäure into the Salzform takes place in an alkaline sodium sulfide wash fleet, how one uses it usually for the distance of metal and sulfur impurities. 1h some cases, particularly if an acid laundry follows the sulfide laundry, can be desirable it, the fiber with a base to e.g. treat a diluted Natriumbicarbonat or sodium hydroxide solution or a similar solution in order to lock and guarantee the transformation that 30 a high percentage of the copolymer in SaMorm is present. Also it can prove as necessary, to the degree of the transformation into the Salzform with certain ranges of application, where the material with the body can come into contact, limit since a pH value, which lies substantially over 7 to 7.5, can sensitive skin portions provoke and promotes the growth of harmful microorganisms. Finally still another treatment with a conventional Avivage, e.g. an surface-active means 35 can take place. Afterwards the Stapelfeser in a continuous dryer up to a certain moisture content is dried, which depends on the special intended purpose of the fiber. The fiber can be combined or kardiert then into bundles, in order to one of the final products mentioned above to be then converted. A particularly suitable operational area for the fiber according to invention are Tampons, which can be manufactured e.g. after one of the procedures in accordance with the US-PS No. 3.699, 965 or after 40 other well-known methods. According to invention used the copolymers can be manufactured in well-known procedures. In each case a certain quantity of monomerer acrylic acid and Methacrylsäure, which are so computed that one receives the desired average proportion in the copolymer, becomes simplest, as well as a polymerization initiator in a reaction container mixed, where one leaves them up to the completion of the Poly-45 of merisationsprozesses. For the production of special polymers also the specialist well-known special methods can be used, like e.g. Use of chain transmission means and other Molekulargewichtsreglem, wetting agents, surface-active means, redox ^ystemen, controlled monomer additive and ähnl. A copolymer, which contains 50% in each case units derived from acrylic acid and Methacrylsäure, is preferential, whereby a Veihältnis between 90: 10 (acrylic acid/Methacrylsäure) and 50 10: 90 is likewise useful. The viscosity of the copolymer informs about its polymerization degrees and the molecular weight. A wider range of the polymerization degree proved than usefully, and a delimitation of the polymerization degree results primarily from the processing conditions. For example a copolymer with a higher molecular weight will stay generally in larger quantities of 55 in the fiber; however if the copolymer is to be injected into the viscose rayon, the molecular weight is limited by the viscosity, with which the mass lets itself still pump. There are however generally available pumping plants, with which also liquids with a viscosity of 10,000 can be promoted cP and more. If one gives the copolymer to the solvent, one can use also copolymers with a large viscosity range.

- 4 - Nr.346456 the absorption capacity of the fibers lets itself determine with different test procedures. A well-known measure for the absorption capacity is the Wasserrückhaltevermögen or the source value (“Q”), which in the FB-PS No. 2.216.387 described way is determined, on which again purchase one takes here. 5Bei the test becomes in the fiber after ISminütigem the centrifuges with 2500 - until 3000facher the force of gravity quantity of water staying measured, by which the water content in % (on the basis of the dry weight of the fiber sample), staying in the sample, is calculated. In more recent time a test was developed, which agrees good with practice attempts, the so-called “and Wettability test? '(Here light stone, Bemard, Ihtemational Nonwovens and Disposables Association, 2nd annual symposium over fleece material production development, 5 until 6 March 1974, Washington, D.C.) new equipment is used, with which the volume and the speed of the admission of a liquid can be measured thereby that one adjusts the absorbing material to a hydrostatic pressure of zero, so that a humidification takes place only as required the absorbing material. Thus a Flüssigkeitsaufnahme takes place only due to the ability of the absorbing material to absorb liquid whereby the liquid is stopped immediately keitsstrom with reaching the saturation point. Changes of the method for simulating a final product are possible. For example one can e.g. compress the fiber mass, in order to simulate a Tampon. One can examine the compressed fiber with the equipment with different external pressures and test liquids. In order fibers with success to useful products such as Tampons or other fleece material articles work egg ten to be able, must be aligned the fibers before the production of the product in a Bichtung, which is reached frequently by Kardieren of the fibers. The Kardierbarkeit of the fiber depends on the adhesion between the fibers, i.e. the ability of the individual fibers, “to hold together” and the handling of the fiber volume without a breakup of the connected mass apart make possible. The adhesion test made here at the kardierten fiber exists to measure only therein, Kraft, which are necessary, in order to tear up or disjoint a Kardenband. The volume adhesion expressed as Kraft in Centinewton, necessary per gram of the fiber. The invention becomes by the following examples, to which it is however not limited, more near describes. 30Beispiel 1: A solution of a copolymer 90A0 acrylic acid is placed mixed with Methacrylsäure ago and injected into a viscose rayon solution with a concentration of 5% CIV, thoroughly with the viscose rayon and into a usual acid coagulating bath with 8,5% sulfuric acid, 5,0%MgSO4_{) to} 3,0%ZnSO4, 18.2% Na^SO^ and 40 to 35 T^M Lauiylpyridiniumchlorid with 49 to 510C eingesponnen for coagulation and Begenerierung of the cellulose and for the production of a Games of 1100 with 480 the filaments. The developed yarn is then led by a fresh hot Wasserbad from 93 to 950C and drawn therein around 37%. Then the yarn is finally treated 40 min put down into a Spinntopf into cake pan, with 30oC washed, then 40 min with 520C with 0,50%iger of aqueous sodium sulfide solution and 0.05 to 0.10 sodium hydroxide, 80 min with 30oC with water, with 30oC with 0,01%iger acetic acid and 40 min with 40oC with a 0,2%igen emulsion of a mineral oil with a pH value from 7 to 8, drained 4.5 min and dried with 40 70 to 80oC over night. Further fiber samples manufactured in the same way, however using Copoly merisafen from acrylic acid and Methacjylsäure with a weight ratio of 80: 20 and/or 50: 50. Di of the following table is confronted the Wasserrückhaltevermögen of these fibers to that of the same fibers without copolymer additive.

- 5 - Nr.346456 polymer additive pH of % solids of % solids as free acid computes viscosity (Brookfield) spindle No. 2 Wasser-rück-halte-ver-mögen (s/s)* - - - - 0.97 90A0 acrylic sänre/Methacryl acid (AA/MAA) 5.6 19.44 1.36 80/20 acrylic s äure/Methac ryl acid 5.4 25.08 1.30 50/50 acrylic acid/Metlia.oiyl acid 5.0 - viscosity (Brookfield) computes 21.32 1.27 polymer additive pH of % solids of % solids as free acid spindle No. 2 Wasser-rück-halte-ver-mögen (s/s)* - - - - 0.97 90A0 acrylic sänre/Methacryl acid (AA/MAA) 5.6 19.44 1.36 80/20 acrylic s äure/Methac ryl acid 5.4 25.08 1.30 50/50 acrylic acid/Metlia.oiyl acid 5.0 - 21.32 1.27 * held back water in g/g fiber example 2: A solution from a Homopolymerisat from Aerylsäure (Böhm and Haas Acrysol Al) was neutralized up to a pH value of 5,2 partly and then injected into a viscose rayon solution mixed with a concentration of 10% CIV, griindlieh with the viscose rayon and into a usual Säure-5 coagulating bath with approximately 5% sulfuric acid, about 20% sodium sulfate, about 1% zinc sulfate and 25 TpM Laurylpyri 'diniumchlorid with 56 to 580C eingesponnen for the purpose of the coagulation and recovery of the cellulose and for the production of a cable of 22,488 with 7496 the filaments. The developed cable was drawn in air around 40%, led by a second bath from 92 to 970C, which contained 3.2% sulfuric acid and altogether about 6.15% salts (NaS04 + ZnS04), and drawn therein around 18%. Then the cable in company sem was cut from 14,3 to 25.4 mm length. The pile fiber was then washed with water, afterwards with 0,30%iger sodium sulfide solution, whereupon with water, then with a 0,175%igen sulfuric acid solution, afterwards with water and finally with 0,20%igemNatriumbicarbonat. Then the material with a 0,30%igen aqueous solution was aviviert by Sorbitan Monoleat and äthoxylierter stearic acid. Afterwards the fibers about 1/2 h in one continuous dryer with for instance 80oC, about 1/2 h with for instance 70oC and again about 1/2 h were dried with for instance 50oC. The moisture content amounted to then about 11%. Additional fiber samples were made in the same way, however using a Homopolymerisats of Polymethacrylsäure and a copolymer (50/50 thread - %) from Aerylsäure and Methacrylsäure. The following table contains the test results for the water and salt support ability (on use of a l%igen sodium chlorid solution in place of water) of the different samples.

- 6 Nr.346456 i IO m - RH OS mi“31^{: 0} fli •^! e| s £ 1^; <oIM•* gi-s (M o •s CO S •C? iHT-H1-1 iä D ^ *-*” 'D in •- * ^ <D r-i§ 1 's; • oo O o o o IMa B ““iH> “o % solid computed as free acid o o OS in” the INIM<M<2 ““0DQ *t Ot-COtHftIMIMM^SIMiaIM in C<5 oo Ol g ©s B l1 m e: 5 in 12 1 & (UDl tsi O u U3 S | fti IO m - RH OS mi“31^{: 0} fli •^! e| s £ 1^; <oIM•* gi-s (M o •s CO S •C? iHT-H1-1 iä D ^ *-*” 'D in •- * ^ <D r-i§ 1 “s; • oo O o o o IMa B ““iH> “o % solid computed as free acid o o OS in” the INIM<M<2 ““0DQ *t Ot-COtHftIMIMM^SIMiaIM in C<5 oo Ol g ©s B l1 m e: 5 in 12 1 & (UDl tsi O u U3 S | ft7 - Nr.346456 example 3: In accordance with example 2 manufactured fibers with 5 and 10% CIV Polyacrylsäure, Sund 10% CIV of a copolymer (90/10 thread - %) from acrylic with Methaaiylsäure and 5 and 10% of a copolymer (50/50 thread - %) from acrylic with Methacrylsäure were examined with “to the Wettabilily the Testf” with application of the general procedure in accordance with the test regulations and the external pressures given in the following table an-5 and solutions.

u " o * U^0eocoin| P§Iiinr ltfe " °SÜJ^Oi * t-a>0 joIiinr lin: o^T! •r1&$* * tDinco “o cdfl. “D " CD*t” * " ininoiHHi-lHrHrHd*tHS h3iCTt-oCTo>CO: ^t-CDt-*t “t (rHHrHHrH m *D: D” - ^S Ä “S <MoOt oom O U4 ÄinOMooiaoCOCTNCOHCdH4S m m> m1^m1 S "³ -2£oNt-oS I ri 8sN*H*r-TrHo: AI (NIM<M (M (M^a m <u “hSS ^aia<*t-THCTh St>b-tot-CO^ OQINNIM<M (Mes * OOMIM “•” & * iainininSSS^g^hSä SHljn igfei o, 2 (DIN 5g9 O o U3 < Sm < olS SS^ Ss^ CSU " o * U^0eocoin| P§Iiinr ltfe " °SÜJ^Oi * t-a>0 joIiinr lin: o^T! •r1&$* * tDinco “o cdfl. “D " CD*t” * " ininoiHHi-lHrHrHd*tHS h3iCTt-oCTo>CO: ^t-CDt-*t “t (rHHrHHrH m *D: D” - ^S Ä “S <MoOt oom O U4 ÄinOMooiaoCOCTNCOHCdH4S m m> m1^m1 S "³ -2£oNt-oS I ri 8sN*H*r-TrHo: AI (NIM<M (M (M^a m <u “hSS ^aia<*t-THCTh St>b-tot-CO^ OQINNIM<M (Mes * OOMIM “•” & * iainininSSS^g^hSä SHljn igfei o, 2 (DIN 5g9 O o U3 < Sm < olS SS^ Ss^ sm o p.mstoia §o OI •3€ja “j S^ü|^^ CD” Ot o ** A “3 ' OäeIßrÖÜä%'OäeIßrÖÜä% (U<U rHÄ 1o > OüISPCOoIQiSd ofl omfl)” SS Oh Q <]} ora S -•eomu A mf=HaIpH 1 §IQO'S flat steel bar t “11 &l-i” o^w 0§^S 1< 3 Nr.346456 example 4: Three fibers of example 3, which contained 10% CIV of the three different polymers, kardiert, to Tampons converted and in Syngina equipment tested, which is descriptive by G.W. Bapp in its elaboration with the title “A eomparison OF The Absorpöve Effioiency OF Ihe Commericial Cata menial Tampons”, which was published in June 1958 by the department OF Research of the Loyola university in Chicago, 5 Illinois. As test liquid a synthetic exudate, in accordance with which description uses in the US-PS No. 3.589.364, was dest that from 1% sodium chloride, 0.4% Natriumcarbo-nat, 10,0%Glycerin, 0.46% Carbomethylcellulose and 88.14%. Water existed. The results of this examination are shown in the following table. At the values acts it see around average values out of five tests.

Additive taken up liquid (g/g) Polyacrylsäure 50/50 acrylic Methacrylsäure 4.70 5.48 5.62 additive taken up liquid (g/g) Polyacrylsäure 50/50 acrylic Methacrylsäure 4.70 5.48 5.62 example 5: The fibers of example 3, which 10% CIV Polyacrylsäure and/or 10% CIV of a copolymer (50/50 thread - %) from Aciyl and Methacrylsäure contained, were kardiert to a fiber cotton ball. By compressing and Eriiitzen of 3 g of these fibers in one bore with a diameter of 2,54 cm disks were manufactured. These disks became then in the “and Wettability test? 'with 15 an external pressure of approximately 0.014 bar and examined using a l%igen sodium chlorid solution as test liquid. The following table shows the average values from 15 examinations.

Polymer additive Aufgen. Liquid (g/g) Polyacrylsäure 50/50 acrylic Methacrylsäure 6.2,6.4 polymer additive Aufgen. Liquid (g/g) Polyacrylsäure 50/50 acrylic Methacrylsäure 6.2,6.4 example 6: In the procedure of example 2 fibers were manufactured, which 15 and/or 20% CIV of a copolymer (50/50 thread - %) from acrylic acid and Methacrylsäure contained. The Eückhaltewerte 20 for water (WBV), saline solution l%ig (SBV) and synthetic exudate (EBV) (described in example 4) the following table shows.

9 - Nr.346456 i jg s* i * hnin * t-§1 A-§lOoo Exs riicl oi-TrH© i-ioo•^ “S Ho*tHi-l: he old bgen t-t-oIM•>w•> i-4-M 'U: ni” - *^ “'S s 13 in C-s 8-i£ H1-4. “U 03> n0) celebration toffe R. as e Säur t-1-4 *” jsi NCCI “H.©”•2C “oNIMh6RWiHrHaiain (0<BÖ° Ö0 ÖS < DJü ^ ä ^ ^ = 3 s. e. 5 s. e. s&: | | S^ ü. - 3 “*O Ä eiRe9 ^1 Sil s^ä => 5 SIM “tj SI jg s* i * hnin * t-§1 A-§lOoo Exs riicl oi-TrH© i-ioo•^ “S Ho*tHi-l: he old bgen t-t-oIM•>w•> i-4-M 'U: ni” - *^ “'S s 13 in C-s 8-i£ H1-4. “U 03> n0) celebration toffe R. as e Säur t-1-4 *” jsi NCCI “H.©”•2C “oNIMh6RWiHrHaiain (0<BÖ° Ö0 ÖS < DJü ^ ä ^ ^ = 3 s. e. 5 s. e. s&: | | S^ ü. - 3 “*O Ä eiRe9 ^1 Sil s^ä => 5 SIM “tj S Nr.346456 example 7: In the procedure of example 2 fibers were manufactured, the 15% GIV Acryl-und Mefchaorylsäure in a weight ratio of 75: 25, 25: 75 and 10: 90 contained. The water and salt support values are specified in the following table.

oIMCDOli” 5IMt-a A fgt * “t-oinOoininc-inooot-o” o CO N Hco. - < t-oinOoininc-inooot-o” o CO N Hco. - < § £ *ü'S <4H pi. üuesto£ü'S <4H pi.

üuesto£inO <M00 IN ffl “2 oN<MinIMmIMoocos A moin the CO ineoinininmoin CO ineoinining on behalf o s m ä s8's " m•3i ii” - H & g & & fc " ooo < < s <! o fli o jnininko insm IN the s8's " m•3i ii” - H & g & & fc " ooo < < s <! o fli o jnininko insm IN o<! ^5.9 5 Nr.346456 example 8: In the procedure of example 2 fibers were manufactured, the 10, 15 and 20% CIV Polyacrylsäure and/or 10, 15 and 20% CIV of a copolymer (50/50 Gew. - %) from Aeryl and Methacryl acid contained, these fibers on a conventional 1 m Deckelkarde with a speed of 7,3 kgtfi to a volume with a weight of 3, 86 g/m were kardiert. 5Die the following table shows the values for the volume adhesion: Polymer additive (CIV) Banhdhaftung (eN/g) Polyaciylsäure 50/50 acrylic Methacryl acid 10% 15% 20% 81.8 74.1 84.9 121.9 121.9 114.2 213.0 polymer additive (CIV) Banhdhaftung (eN/g) Polyaciylsäure 50/50 acrylic Methacryl acid 10% 15% 20% 81.8 74.1 84.9 121.9 121.9 114.2 213.0 all viscosity values indicated in the above examples with the Brookfield Viskosimeter with a spindle No. 2 were determined. From the results of example 1 it becomes clear that during storage of copolymers, the acrylic acid and Methacrylsäure contained in different portions, which are substantially increased Wasserrückhaltevermögen opposite normal Bayon. A further interesting feature with this example is support worth the Abfell in the water with increase of the Methaorylsäureanteils in the copolymer. The higher Wasserrückhaltevermögen of Polyacrylsäure opposite Polymethaciylsäure could be proven in example 2 clearly. The difference is not surprising, if one considers that like the water support en with the swelling of the fiber is connected and that the swelling with a anionischen polyelektro lytischen network for example Polyacrylsäure or a copolymer from Polyacrylsäure and Poly methacrylsäure, to lonisationsgrad the Polyelektrolyts is proportional. If one considers that lonisationsgrad the Polyacrylsäure than lonisationsgrad the Polymethaciylsäure is larger, then the results of example 1 and 2 are not surprising. The Wasserrückhaltevermögen does not determine however alone the effectiveness of an absorption material. In the literature numerous test procedures are described, with which is tried to determine the behavior of the fibers on simulated practice conditions. The examination of the fibers, which contained erflndungsgemäß the copolymers which can be used, to the “and Wettability test) 'and the Syngina procedure in accordance with example 3, 4 and 5 points that the copolymers point higher absorption values than Polyacrylsäure up from acrylic and Methacrylsäure indeed. For this rather unexpected result there is for the time being still no plausible explanation. It is however obvious that the absorptive properties of the fiber in certain areas of application are affected still of another mechanism than the ionization of the group of carboxyl acids.

PATENT CLAIMS; 1. Cellulose fiber by stored acrylic polymer and marked by high absorption capacity, which is suitable for the production of fleece material articles such as diapers, Tampons, lady binding, medical Tupfern, ground mulchen and wiping cloths, thereby that into the cellulose alkali metal or an ammonium salt of a copolymer from acrylic acid with Methaciylsäure is stored. 2.Verfahren after requirement 1, by it marked that the cellulose fiber from a viscose rayon solution, into which in a quantity from 2 to 30 thread - %, related to the weight of the cellulose in the viscose rayon solution, a copolymer from acrylic acid and Methacrylsäure is interfered, regenerated was. 3.Faser according to requirement 2, by characterized that the weight ratio between the acrylic acid and the Methaciylsäure in the copolymer between 10: 90 and 90: is appropriate for 10. 4. Fiber according to requirement 3, by characterized that the weight ratio about 50: 50 amounts to.

Pressure: Ihg. E. Voyijech.Wien