GB1590504A - Cross-linked cellulose fibre and a method of producing the same - Google Patents
Cross-linked cellulose fibre and a method of producing the same Download PDFInfo
- Publication number
- GB1590504A GB1590504A GB9624/78A GB962478A GB1590504A GB 1590504 A GB1590504 A GB 1590504A GB 9624/78 A GB9624/78 A GB 9624/78A GB 962478 A GB962478 A GB 962478A GB 1590504 A GB1590504 A GB 1590504A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- fibre
- fibres
- cross
- linked
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 17
- 229920003043 Cellulose fiber Polymers 0.000 title claims description 8
- 239000000835 fiber Substances 0.000 claims description 35
- 229920002678 cellulose Polymers 0.000 claims description 33
- 239000001913 cellulose Substances 0.000 claims description 33
- 229920000297 Rayon Polymers 0.000 claims description 18
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 17
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 14
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 14
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 14
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 238000009987 spinning Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 8
- 238000006467 substitution reaction Methods 0.000 claims description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- 238000004132 cross linking Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 125000001424 substituent group Chemical group 0.000 claims description 6
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 239000003633 blood substitute Substances 0.000 claims description 4
- 238000009960 carding Methods 0.000 claims description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 3
- 229920003064 carboxyethyl cellulose Polymers 0.000 claims description 3
- 229920000578 graft copolymer Polymers 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 2
- 229920002785 Croscarmellose sodium Polymers 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims description 2
- YLGXILFCIXHCMC-JHGZEJCSSA-N methyl cellulose Chemical compound COC1C(OC)C(OC)C(COC)O[C@H]1O[C@H]1C(OC)C(OC)C(OC)OC1COC YLGXILFCIXHCMC-JHGZEJCSSA-N 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000008186 active pharmaceutical agent Substances 0.000 claims 5
- 230000000274 adsorptive effect Effects 0.000 claims 1
- 239000003054 catalyst Substances 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 14
- 235000011121 sodium hydroxide Nutrition 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 235000015895 biscuits Nutrition 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000001117 sulphuric acid Substances 0.000 description 3
- 235000011149 sulphuric acid Nutrition 0.000 description 3
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229960001407 sodium bicarbonate Drugs 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 2
- 235000009529 zinc sulphate Nutrition 0.000 description 2
- 239000011686 zinc sulphate Substances 0.000 description 2
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 1
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- JXTHNDFMNIQAHM-UHFFFAOYSA-N dichloroacetic acid Chemical compound OC(=O)C(Cl)Cl JXTHNDFMNIQAHM-UHFFFAOYSA-N 0.000 description 1
- 229960005215 dichloroacetic acid Drugs 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 1
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 1
- 229920001477 hydrophilic polymer Polymers 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical group [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 1
- 159000000000 sodium salts Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/12—Aldehydes; Ketones
- D06M13/127—Mono-aldehydes, e.g. formaldehyde; Monoketones
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/28—Polysaccharides or their derivatives
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
- D06M14/02—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials on to materials of natural origin
- D06M14/04—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials on to materials of natural origin of vegetal origin, e.g. cellulose or derivatives thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
- D06M14/18—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation
- D06M14/20—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of natural origin
- D06M14/22—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of natural origin of vegetal origin, e.g. cellulose or derivatives thereof
Description
(54) IMPROVEMENTS IN OR RELATING TO A CROSS-LINKED
CELLULOSE FIBRE AND A METHOD OF PRODUCING THE SAME
(71) We, CHEMIEFASER LENZING AKTIENGESELLSCHAFT, a company organised under the laws of Austria, residing at 4860 Lenzing, Austria, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The invention relates to a wet cross-linked cellulose fibre and a method of producing such a fibre which can be used as suction means for absorbing aqueous-physiological body liquids.Such suction means are used for tampons in women's hygienics and in dental technology, furthermore for children's napkins, for sanitary towels, and for other disposable articles, wherein the liquid-sucking and liquid-retaining properties shall prevail also during pressure - influence.
It has been known to use cellulose as an absorption material. In the German Patent No.
1,492,365 wet cross-linked cellulose fibres are proposed for use as an absorption material.
Also hydrophilic polyurethane foams and hydrophilic polymers based on polyacrylamide or poly-N-vinylpyrrolidone can be used as absorption materials. The prerequisities for an advantageous application in all absorption materials are a good absorption, a good ability to retain absorbed liquid under influence of pressure and a good physiological compatibility.
Because of the latter, the amount of substances which diffuse out of the absorptive material must be as low as possible, almost nil.
According to the present invention there is provided a wet cross-linked cellulose fibre consisting of cross-linked cellulose modified with hydrophilic substituents.
The modified cellulose can be, for example, carboxymethyl cellulose, carboxyethyl cellulose, hydroxyethyl cellulose or methyl cellulose, each having a degree of substitution of from 0.01 to 0.3, preferably from 0.02 to 0.25. The fibre can also consist of mixtures of the said cellulose derivatives or of grafted cellulose, the grafted polymer chains being derived from acrylic acid, methacrylic acid or hydroxyethyl methacrylate, or mixtures thereof. The molecules of the modified cellulose carry the hydrophilic substituents, the hydroxyl groups of the glucose units being more or less substituted, depending on the substitution degree. A mixture of cellulose derivatives with pure cellulose does not fall within the scope of the invention.The requirement that each cellulose molecule must carry hydrophilic substituents is important for meeting the prerequisite of a small extraction content of the cross-linked fibres, to produce fibres according to the invention which have a better absorbency than known fibres of pure cellulose, even if the known cellulose is cross-linked.
It has been found that the cellulose fibres according to the invention shown extremely high rates of absorption for physiological liquids, even when the fibres are under pressure. This holds both for their ability to absorb liquids and their ability to retain absorbed physiological liquids. The cross-linking agent can be for example formaldehyde or dichloracetic acid. When using formaldehyde as linking agent, methylene bridges will form between the modified cellulose molecules. The degree of cross-linking suitably is that the content of methylene groups in the polymer amounts to 0.2 to 2 percent by weight thereof.
The production of threads or fibres of the modified cellulose is suitably carried out using a known viscose spinning method.
The fibres according to the invention advantageously have a thickness of 1.5 to 18 -dtex, preferably 1.7 to 8.5 dtex, and a length of 10 to 130 mm, preferably 35 to 50 mm. In order to increase the carding ability, the fibres can be avived after the cross-linking. A suitable aviving agent is polyethylene glycol having a molecular weight of 300 to 6,000, preferably 350 to 4,500. A suitable commercial product is for instance "Carbowax" (registered Trade
Mark) of Union Carbide. The aviving layer should preferably amount to 0.05 to 0.8%, preferably 0.6%, of the fibre weight.
In particular, the production of the fibres can be carried out under application of a viscose method as follows:
The cellulose derivatives are alkalised with a sodium hydroxide solution and then pressed
to remove excess solution, the biscuit is unravelled and sulphided, either directly or after
maturing, with carbon bisulphide, in an amount of from 25 to 45% by weight of the
cellulose. The resultant xanthate of the cellulose derivative is dissolved in a diluted lye and
the solution is allowed to further mature in order to obtain a better spinning capability. For
the productionof the fibres according to the invention the spin solution obtained is spun in
an acid, salt-containing spin bath. After cutting of the resultant fibres to give staple fibres,
the fibres are washed and cross-linked in an acid or alkaline medium, either directly, i.e.
without first drying the fibres, or after drying and rewetting with water. As cross-linking
agents, formaldehyde or bi- or poly-functional compounds can be applied. Cross-linking of
non-dried fibres is preferably performed by means of formaldehyde in a strongly acidic
medium. In case of carboxyl containing fibres the derivative is converted into the sodium
nitrate form, after a further washing with diluted sodium hydroxide, sodium carbonate or
sodium bicarbonate solutions. Finally, the fibres are avived using a polyethyleneglycol
solution. In this manner, one obtains a considerable increase in the hydrophilic property
and of the absorbance of the fibre material as compared to other cellulose materials without
simultaneously increasing the extraction content.
The present invention will now be illustrated by the following Examples:
Example I (Production of fibres):
A carboxymethylated cellulose having a degree of substitution of 0.07 was mashed with soda lye having a concentration of 210 g/l for one hour at 35"C at a mash ratio of 1:30, and was then compressed. The resultant biscuit contained 16% of alkali and 35% of the carboxymethyl cellulose having a degree of substitution (DS) of 0.07. After unravelling, the biscuit was sulphided for 2.5 h at 28"C with an amount of 40% of carbon bisulphide, based on the carboxymethyl cellulose weight. The crumbly reaction product obtained was processed into viscose by dissolving it in diluted soda lye to give a viscous liquid composed of 6% of carboxymethyl cellulose having a DS of 0.07, a total of 6% of alkali, 1.6% of sulphur.This solution could be filtered without difficulty. It was spun into a spin bath composed of 115 g of sulphuric acid/l, 110 g of sodium sulphate/l, 20 g of zinc sulphate/l.
The individual fibres, after being drawn to 150 % of their original length, had a thickness of
1.7 dtex. They were cut into fibre staples having a length of 50 mm. A small part 6f the fibres was dried for determining the water-retaining property of the fibres. The water-retaining property of the fibres was 146 %. 100 g of the non-dried part of the fibres was cross-linked in a bath of the following composition: 3,300 ml of formalin solution (40%) and 175 ml of concentrated sulphuric acid. The temperature of the bath was kept at 800C.
After 10 minutes the fibres were separated from the bath and washed with hot water until neutral. Through further washing with a 10% sodium-bicarbonate solution, the carboxymethyl groups were converted into the sodium salt form. Finally, the solution was washed with cold water until neutral, treated with a 0.6% polyethyleneglycol solution as an aviving agent and dried at 110 C. After such cross-linking, the water-retaining ability of the fibres was 220%.
Example 2
Carboxymethylated cellulose having a substitution degree of 0.05 was processed into a viscose as stated in Example 1. This viscose was spun into a spin bath composed of 75 g of sulphuric acrid/1, 110 g of sodium sulphate/1 and 60 g of zinc sulphate/1, at 400C. The threads obtained in this way were drawn by 100% in a bath containing 20 g of sulphuric acid/l at 900C, then cut into 5.5 dtex staple fibres having a length of 50 mm, and aftertreated in a known way for elimination of by-products. Part of the fibres were dried at 1050C for determining physical parameters. The water-retaining ability of these fibres was 107%.
That part of the fibres not dried was treated as stated in Example 1. The water-retaining ability then was 142%. The strength in the conditioned state was 21 to 27 cN/tex at an expansion of 10 to 12%, thus definitely lying within a region guaranteeing a carding ability acceptable for the production of tampons.
Example 3 (Production of an absorptive body):
The fibre material produced according to Example 1 was carded. The resulting card web was combined into a card rope having a width of 52 mm. The latter was cut into pieces having a length of 250 mm, and formed, by rolling and pressing, into a cylindrical body having a length of 50 mm and a diameter of 12 mm - which is similar to a commercial tampon. The weight of the absorptive body was 3 g.
The properties of absorptive bodies produced with fibres according to the invention were compared with those of absorptive bodies made from the known fibres listed below. For the purpose of comparison, cylindrical tampons were produced from the known fibres in the manner described above.
1. viscose spinning fibres consisting of cellulose, 2.8 dtex, 38 mm; 2. cross-linked viscose spinning fibres consisting of cellulose, 5.2 dtex, 40 mm; 3. non cross-linked fibres produced according to the viscose spinning method and consisting of carboxymethyl cellulose having a DS of 0.07, 1.7 dtex, 50 mm; 4. cross-linked fibres produced according to the viscose spinning method and consisting of carboxymethyl cellulose having a DS of 0.07, 1.7 dtex, 50 mm; 5. cross-linked fibres produced according to the viscose spinning method and consisting of carboxymethyl cellulose having a DS of 0.05, 5.5 dtex, 50 mm.
The expansion which occurred in each absorptive body during absorption or a liquid blood substitute was measured against a membrane being kept under a pressure of 170 mm water column, after 1 minute, after 3 minutes and after 15 minutes. The liquid blood-substitute was composed of 70 g of Tylose H 20 (Hoechst), 50 g NaCl, 20 g NaHCO3, 500 g glycerol, made up with water to 5,000 ml.
The values obtained, including the total amount of liquid absorbed (in grams), are summarised in the following table:
Absorptive Weight of Expansion in ml, after Total amount
Body Absorptive 1 min/ 3 min/ 15 min of liquid
Body absorbed (g)
1 3.01 3.7 6.5 11.3 15.4 2 2.89 5.8 12.0 17.8 22.6 3 2.93 3.6 7.2 12.2 16.4 4 3.00 9.1 20.4 22.3 26.9 5 2.97 6.0 14.6 19.8 25.2
Comparison of the results in the table shows that the expansion and the total absorption obtained with cross-linked cellulose and with pure carboxymethyl cellulose having a DS = 0.07 are higher than those of non cross-linked viscose spinning fibre, but that the cross-linked fibre materials 4 and 5 consisting of carboxymethyl cellulose having a DS = 0.07 and being fibres in accordance with the invention lead to considerably outstanding absorption and retaining values.
The extraction content of absorptive bodies 4 and 5 by extraction with hot (750C) water or diluted lye of 2 g/l of NaOH-concentration, also determined at 75"C, was 0 to 0.34%.
As can be seen from Example 2, fibres for absorptive bodies can be produced when using a spin bath containing a higher amount of zinc, which fibres additionally have an improved carding ability, as can be seen from the strength data, and, at the same time, have excellent absorption properties.
WHAT WE CLAIM IS:
1. A wet cross-linked cellulose fibre consisting of cross-linked cellulose modified with hydrophilic substituents.
2. A fibre according to Claim 1, having a degree of substitution of from 0.01 to 3 and comprising wet cross-linked carboxymethyl cellulose, carboxyethyl cellulose, hydroxyethyl cellulose, methyl cellulose or a mixture thereof.
3. A fibre according to Claim 2, further comprising graft polymer chains derived from one or more of acrylic acid, methacrylic acid and hydroxyethyl acrylate.
4. A fibre according to Claim 1, 2 or 3, wherein the cross-linkages in the cross-linked cellulose are formed by methylene groups, the degree of cross-linking being such that the methylene group content of the cellulose is 0.2 to 2 percent by weight.
5. A fibre according to any one of Claims 1 to 4, wherein the fibre has a thickness of 1.5 to 18 dtex.
6. A fibre according to Claim 5, having a thickness of 1.7 to 8.5 dtex.
7. A fibre accoramg to any one of the preceding claims, having a length of 10 to 130 mm.
8. A fibre according to Claim 7, having a length of 35 to 50 mm.
9. A fibre according to any of the preceding claims, the fibre having been subjected to an aviving treatment with a polethyleneglycol having a molecular weight of from 300 to 6,000.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (17)
1. A wet cross-linked cellulose fibre consisting of cross-linked cellulose modified with hydrophilic substituents.
2. A fibre according to Claim 1, having a degree of substitution of from 0.01 to 3 and comprising wet cross-linked carboxymethyl cellulose, carboxyethyl cellulose, hydroxyethyl cellulose, methyl cellulose or a mixture thereof.
3. A fibre according to Claim 2, further comprising graft polymer chains derived from one or more of acrylic acid, methacrylic acid and hydroxyethyl acrylate.
4. A fibre according to Claim 1, 2 or 3, wherein the cross-linkages in the cross-linked cellulose are formed by methylene groups, the degree of cross-linking being such that the methylene group content of the cellulose is 0.2 to 2 percent by weight.
5. A fibre according to any one of Claims 1 to 4, wherein the fibre has a thickness of 1.5 to 18 dtex.
6. A fibre according to Claim 5, having a thickness of 1.7 to 8.5 dtex.
7. A fibre accoramg to any one of the preceding claims, having a length of 10 to 130 mm.
8. A fibre according to Claim 7, having a length of 35 to 50 mm.
9. A fibre according to any of the preceding claims, the fibre having been subjected to an aviving treatment with a polethyleneglycol having a molecular weight of from 300 to 6,000.
10. A fibre according to Claim 9,'wherein the molecular weight of the polyethylene
glycol is from 350 to 4,500.
11. A fibre substantially as hereinbefore described in Example 1 or 2.
12. A method of producing a fibre according to any one of the preceding claims, which method comprises treating staple fibres or filaments of cellulose with formaldehyde at an elevated temperature in the presence of an acidic catalyst, the cellulose being one which is modified with hydrophilic substituents and is produced according to a viscose method.
13. A method according to Claim 12, substantially as hereinbefore described in
Example 1 or 2.
14. A fibre according to any of Claims 1 to 11 when prepared by a method as claimed in
Claim 12 or 13.
15. An absorptive body prepared from a fibre as claimed in any one of Claims 1 to 11 and 14.
16. An absorptive body according to Claim 15 in the form of a tampon.
17. An adsorptive body according to Claim 15, substantially as described in Example 3.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT193277A AT361888B (en) | 1977-03-21 | 1977-03-21 | WET CROSSLINKED FIBER ON CELLULOSE BASE AND METHOD FOR THE PRODUCTION THEREOF |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1590504A true GB1590504A (en) | 1981-06-03 |
Family
ID=3524132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9624/78A Expired GB1590504A (en) | 1977-03-21 | 1978-03-10 | Cross-linked cellulose fibre and a method of producing the same |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT361888B (en) |
| DE (1) | DE2809312A1 (en) |
| FR (1) | FR2384867A1 (en) |
| GB (1) | GB1590504A (en) |
| IT (1) | IT7821433A0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367963A (en) * | 2015-07-24 | 2017-02-01 | 韦尔豪泽Nr公司 | Grafted crosslinked cellulose |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5487942A (en) * | 1994-04-28 | 1996-01-30 | Nippon Sanmo Sensyoku Co., Ltd. | Carboxyl group-modified acrylonitrile fiber and process of producing same |
| DE69428980D1 (en) * | 1994-04-29 | 2001-12-13 | Nippon Sanmo Sensyoku Co Ltd | Carboxy group modified cellulose or acrylic fibers and process for making the same |
| EP3221509B1 (en) * | 2014-11-21 | 2018-12-26 | Rohm and Haas Company | Binder compositions for making crosslinked cellulose fiber |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR81755E (en) * | 1958-12-24 | 1963-11-08 | Lipaco Sa | Process for treating cellulose fibers and fabrics with aldehydes |
| NL286002A (en) * | 1961-11-28 |
-
1977
- 1977-03-21 AT AT193277A patent/AT361888B/en not_active IP Right Cessation
-
1978
- 1978-03-03 DE DE19782809312 patent/DE2809312A1/en not_active Withdrawn
- 1978-03-10 GB GB9624/78A patent/GB1590504A/en not_active Expired
- 1978-03-21 IT IT7821433A patent/IT7821433A0/en unknown
- 1978-03-21 FR FR7808196A patent/FR2384867A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367963A (en) * | 2015-07-24 | 2017-02-01 | 韦尔豪泽Nr公司 | Grafted crosslinked cellulose |
| US11591429B2 (en) | 2015-07-24 | 2023-02-28 | International Paper Company | Grafted crosslinked cellulose |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2809312A1 (en) | 1978-09-28 |
| IT7821433A0 (en) | 1978-03-21 |
| ATA193277A (en) | 1980-09-15 |
| AT361888B (en) | 1981-04-10 |
| FR2384867A1 (en) | 1978-10-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |