GB2062652A - Absorbent regenerated cellulose fibres - Google Patents
Absorbent regenerated cellulose fibres Download PDFInfo
- Publication number
- GB2062652A GB2062652A GB8031680A GB8031680A GB2062652A GB 2062652 A GB2062652 A GB 2062652A GB 8031680 A GB8031680 A GB 8031680A GB 8031680 A GB8031680 A GB 8031680A GB 2062652 A GB2062652 A GB 2062652A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mixed
- fibres
- fibre
- cellulose
- anionically modified
- 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.)
- Granted
Links
- 239000004627 regenerated cellulose Substances 0.000 title claims abstract description 8
- 229920003043 Cellulose fiber Polymers 0.000 title abstract 2
- 230000002745 absorbent Effects 0.000 title 1
- 239000002250 absorbent Substances 0.000 title 1
- 239000000835 fiber Substances 0.000 claims abstract description 30
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 235000011149 sulphuric acid Nutrition 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 229920001282 polysaccharide Polymers 0.000 claims abstract description 13
- 239000005017 polysaccharide Substances 0.000 claims abstract description 13
- 229920000297 Rayon Polymers 0.000 claims abstract description 12
- 238000002788 crimping Methods 0.000 claims abstract description 12
- 230000005070 ripening Effects 0.000 claims abstract description 11
- 230000014759 maintenance of location Effects 0.000 claims abstract description 10
- 239000001117 sulphuric acid Substances 0.000 claims abstract description 8
- 150000003839 salts Chemical class 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 3
- 150000004676 glycans Chemical class 0.000 claims abstract 6
- 238000009987 spinning Methods 0.000 claims abstract 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 46
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 26
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 23
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 20
- 235000011152 sodium sulphate Nutrition 0.000 claims description 20
- 229920002678 cellulose Polymers 0.000 claims description 18
- 239000001913 cellulose Substances 0.000 claims description 18
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 15
- 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
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 14
- 235000009529 zinc sulphate Nutrition 0.000 claims description 14
- 239000011686 zinc sulphate Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- -1 alkali-metal salt Chemical class 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 3
- 230000001747 exhibiting effect Effects 0.000 claims description 3
- 229920001477 hydrophilic polymer Polymers 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 2
- 150000001340 alkali metals Chemical class 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 150000003863 ammonium salts Chemical class 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 229920003064 carboxyethyl cellulose Polymers 0.000 claims description 2
- 150000002191 fatty alcohols Chemical class 0.000 claims description 2
- 150000002193 fatty amides Chemical class 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims description 2
- 229920000233 poly(alkylene oxides) Polymers 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 1
- 229910021653 sulphate ion Inorganic materials 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000007832 Na2SO4 Substances 0.000 description 14
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 14
- 239000005864 Sulphur Substances 0.000 description 14
- 229910000368 zinc sulfate Inorganic materials 0.000 description 14
- 239000000463 material Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 150000004804 polysaccharides Chemical class 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 239000003633 blood substitute Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229960001126 alginic acid Drugs 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229940093476 ethylene glycol Drugs 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 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 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/22—Cellulose xanthate
- C08L1/24—Viscose
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Epidemiology (AREA)
- General Health & Medical Sciences (AREA)
- Hematology (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Textile Engineering (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Artificial Filaments (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Regenerated cellulose fibres comprising anionically modified polysaccharides or their salts and having a crimping of at least 7%, may be prepared by adding an anionically modified polysaccharide to viscose and spinning the mixture at a collochemical ripening of 5 to 30 DEG Hottenroth into a sulphuric acid spin bath, whereupon the resulting fibre bundle is drawn in a sulphuric acid secondary bath of a lower concentration. The mixed fibres, which exhibit a higher water and liquid retention capacity, are utilisable for tampons in women's hygienics, in the dental and surgical technologies, for sanitary towels, babies' napkins, sick- sheets, as well as for other disposable articles of general hygienics.
Description
SPECIFICATION
Improvements in or relating to a mixed fibre, its production, and utilisation
The invention relates to a mixed fibre exhibiting a high absorptive strength and a high liquid retention capacity on the basis of regenerated cellulose with a content of hydrophilic polymer additives, a method of producing them as well as their utilisation.
Absorptive materials, such as various cellulose materials, are known. In German patent No.
1,198,060 hydrophilic polyurethane foams are described. Also polymers, such as a, cryloamide, poly-Nvinylpyrrolidon (according to German Offenlegungsschrift No. 1,617,998) or wet-linked carboxymethylcellulose, which can be prepared for instance according to Swiss patent No. 491,140, have good absorptive properties. Viscous fibres containing one or more hydrophilic polymer substances, such as polyacrylic acid (German Offenlegungsschrift No. 23 24 589), poly-N-vinyl-pyrrolidon and if desired carboxymethylcellulose (German Offenlegungsschrift No. 25 50 345), alginic acid (German
Offenlegungsschrift No. 27 50 622) or various copolymers (German Offenlegungsschrift No.
27 50 900), also have already been proposed. Such materials or fibres, in addition to exhibiting a high absorptive strength and a retention capacity for aqueous-physiological liquids that is high even under pressure influence, have to be excellently cardable and physiologically compatible. A prerequisite for a good compatibility is as low a content of extractable substances as possible.
Although the known absorptive materials partly exhibit a high water retention capacity according to DIN 53 814, they have only a moderate retention capacity for aqueous physiological liquids according to the Syngyna test, which means that absorptive bodies pressed of known absorptive 'materials are only to a limited extent capable of expanding against an external pressure when in contact with an aqueous-physiological liquid, of absorbing the same and of retaining the same against an external pressure.
The invention has as its object to improve these properties by providing high-crimped mixed fibres; it consists in that fibres of the initially defined kind contain, as a mixing component, anionically modified polysaccharides or their salts and have a crimping of at least 7%, measured as the change in length under a load of 1 cN/tex.
The term "crimping" denotes the relative change in length in per cent of a fibre under a load of 1 cN/tex.
A mixed fibre according to the invention suitably is comprised of 99 to 60%, preferably of 90 to 80%, regenerated cellulose and of 1 to 40%, preferably 10 to 20%, anionically modified polysaccharides.
According to a preferred embodiment, the fibre contains, as the mixing component, the ammonium or alkali-metal salt of, if desired slightly cross wet-linked, carboxymethylcellulose still soluble in a 6% aqueous soda lye, of carboxyethylcellulose, of carboxymethyl starch, of carboxyethyl starch, or of a mixture of these substances.
The invention also includes a method of producing these mixed fibres, which method is characterised in that
(a) at least one anionically modified polysaccharide, a salt thereof or an aqueous solution thereof, if desired with an alkali metal hydroxide admixed, is mixed with a viscose prepared of 25 to 40% mass, preferably 30 to 35 % mass, of carbon disulphide, based on the cellulose, and comprising a content of 4 to 9% mass of cellulose having an average degree of polymerisation of 400 to 600, furthermore a content of 0.2 to 0.3% mass of a modifier, such as a polyalkylene oxide, an alkoxylising product of ammonia, polyimines, fatty amines, fatty amides, or fatty alcohols.
(b) this mixture, when having a collochemical ripening of 5 to 300 Hottenroth (Ho), preferably 10 to 150 Ho, is spun at a temperature of 35 to 500C, preferably 400C, into a spin bath containing 50 to 80 g of sulphuric acid, preferably 60 to 65 g of sulphuric acrid/1,180 to 300 g of sodium sulphate/1,30 to 50 g of zinc sulphate, preferably 40 g of zinc sulphate/1, the resulting fibre bundle preferably being guided over a deflection, and
(c) the fibre bundle is drawn by 70 to 120 %, preferably by 90 to 100 %, at 80 to 1000C, preferably at 90 to 950 C, in a secondary bath having a content of 2 to 30 g of sulphuric acid, preferably 5 to 10 g of sulphuric acid/1, of 5 to 80 g of sodium sulphate, preferably 20 to 40 g of sodium sulphate/1 and of 3 to 20 g of zinc sulphate, preferably 5 to 10 g of zinc sulphate/1, whereupon, if desired, the anionically modified polysaccharides contained in the fibres are converted into their alkali metal or ammonium salts.
A deflection of the fibre bundle in the spin bath additionally positively effects the absorption properties of the final fibres. After having passed the secondary bath, the mixed-fibre cable is cut and washed in a known manner, the mixing component being converted into a salt if desired, and then avived and dried.
Advantageously, the fibres according to the invention have a titer of 1.5 to 1 0.1, in particular of
1.5 to 5.5, dtex, and a length of 20 to 120 mm, in particular of 30 to 50 mm. It has furthermore proved advantageous to avive the fibres with a stearic acid oligoethyleneglycolate containing 6 to 8 moles of ethyleneglycol/mole of stearic acid.
With a view to an economical production of the mixed fibres according tithe invention, the percentage of the incorporated anionically modified polysaccharide is to be as high as possible in the final fibre, based on the utilisation of the same in the production process of the fibres. By using a slightly cross wet-linked carboxymethylcellulose (CMC), the losses of the mixing component in the course of production can be reduced. The wet-linking may be performed with epichlorohydrin, the cross wetlinked CMC however has to be soluble in a 6 % aqueous soda lye.
The combination of the anionically modified polysaccharide incorporated in the fibres of the invention and of a high crimping degree is decisive for their high absorptive strength and in particular for their high liquid retention capacity. Accordingly, a main field of application of the fibres according to the invention having a water retention capacity (WRC) of at least 140%, but primarily a liquid retention capacity according to the Syngyna test of at least 7.0 g/g, is their processing into tampons for women's hygienics, for the dental and surgical technologies, into sanitary towels, babies' napkins, sick-sheets as well as other disposable articles of general hygienics.
The fibres according to the invention retain their excellent absorption properties even under pressure influence.
For investigating this specific characteristic feature, a modified Syngyna test was carried out. The expansion of a test tampon was determined 1 minute, 3 minutes, and 1 5 minutes after the addition of a blood-substitute solution against a membrane being under a pressure of 16.7 mbar by collecting the water amount displaced and weighing the same. The blood substitute solution used is composed of: 70 a of hydroxyethylcellulose having an average substitution degree of about 2 and a mean molar
weight of about 40,000 (Tylose H 20 of Hoechst) 50 9 of NaCI 20 9 of NaHC03 500 g of glycerol
Addition of water to 5,000 ml.
The values for the liquid uptake after 15 minutes were determined by reweighing.
As the characteristic value, the figure resulting from the division of the totally absorbed liquid amount in g by the dry weight of the tampon in g (liquid retention capacity) is determined.
The determination of the water retention capacity (WRC) was carried out according to DIN 53814.
The production of an absorptive body will be described in more detail in the following: the fibre material was carded and the card web obtained was pressed into cuboid-shaped test tampons of the dimension 50 x 20 x 6 mm, which, having a length of 50 mm, a weight of 2.8 g and a density of 0.5 g/cm3, correspond approximately to a commonly available tampon.
For the comparison of the utilisation qualities of absorptive material produced of fibres according to the invention and those of absorptive materials produced of known fibres, a series of test absorptive bodies was produced of fibres.
In examples 1 to 4, fibres were produced according to the invention, in example 5 fibres were produced of regenerated cellulose without the addition of an anionically modified polysaccharide, and in example 6 fibres were produced on the basis of regenerated cellulose with an admixture of CMC, but with little crimping.
EXAMPLE 1
179 g of a solution containing 6 % carboxymethylcellulose and 6 % soda lye were mixed into 1 kg of viscose containing 6.1 % cellulose, 5.9 % soda lye, 1.5 % sulphur and 0.3 % of an alkylated aminoxethylate. The mixture thus prepared contained 5.7 % cellulose, 6.0 % soda lye, 1.4 % sulphur and 0.3% of an alkylated aminoxethylate and was spun into a spin bath containing 65 g of H2SO4, 230 g of Na2SO4 and 40 g of ZnS04, per liter at a ripening of 13.20 Hottenroth. The temperature of the spin bath was 400C. The coagulated fibre cable was drawn by 100 % in a secondary bath containing 5 g of H2S04, 30 g of Na2SO4 and 5 g of ZnS04, per litre, and having a temperature of 950C.
Subsequently, the continuous fibres were cut into staples, washed, bleached, avived and dried.
The fibres showed the following average properties:
Titer (dtex): 5.5
Staple length (mm): 40
Crimping (%/cN/tex): 8.8
WRC according to DIN 53814 (%): 146
EXAMPLE 2
179 g of a solution containing 6 % carboxymethylcellulose and 6 % soda lye were mixed into 1 kg of viscose containing 6.0 % cellulose, 6.0 % soda lye, 1.7 % sulphur and 0.3 % of an alkylated aminoxethylate, and the mixture thus prepared, which contained 5.8 % cellulose, 6.0 Yo soda lye, 1.6 % sulphur and 0.3 % of an alkylated aminoxethylate, was spun at a ripening of 13,70 Hottenroth. The spin bath had a temperature of 400C and contained 65 g of H2SO4, 230 g of Na2SO4 and 40 g of ZnSO4 per litre.In a secondary bath, which contained 5 g of H2SO4, 30 g of Na2SO4 and 5 g of ZnSO4 per liter and which had a temperature of 950C, the fibre bundle was drawn by 108%. The further processing was performed as in Example 1.
The average properties of the fibres were as follows:
Titer (dtex): 5.5
Staple length (mm): 40
Crimping (96/cN/tex): 8.3
WRC according to DIN 53814 (%): 139
EXAMPLE 3
179 g of a solution containing 6 % carboxymethylcellulose and 6 % soda lye were mixed into 1 kg of viscose containing 6.0 % cellulose, 5.9 % soda lye, 1.7 % sulphur and 0.3 % of an alkylated aminoxethylate. The mixture thus prepared contained 5.8 % cellulose, 6.1 % soda lye, 1.6 % sulphur and 0.3 % of an alkylated aminoxethylate and was spun at a ripening of 11.20 Hottenroth into a spin bath containing 65 g of H2SO4, 230 g of Na2SO4 and 40 g of ZnSO4 per litre and having a temperature of 400C.The fibre bundle was drawn by 102% in a secondary bath containing 5 g of H2SO4, 30 g of
Na2SO4 and 5 g of ZnS04 per litre, and was further processed as in Example 1.
The fibres showed the following average fibre properties:
Titer (dtex): 5.5
Staple length (mm): 40
Crimping (%/cN/tex): 7.3
WRC according to DIN 53814 (%): 148
EXAMPLE 4
220 g of a solution containing 6 % carboxymethyl starch and 6 % soda lye were mixed into 1 kg of viscose containing 5.9 % cellulose, 5.9 % soda lye, 1.8 % sulphur and 0.3 % of an alkylated aminoxethylate. The mixture thus prepared contained 5.9 % total polyglycoside, 5.8 % soda lye, 1.4 % sulphur and 0.3 % of an alkylated aminoxethylate and was spun at a ripening of 12.80 Hottenroth into a spin bath containing 65 g of H2SO4, 230 g of Na2SO4 and 40 g of ZnSO4 per litre and having a temperature of 400C.The fibre bundle was drawn by 95% in a secondary bath containing 5 g of H2SO4, 30 g of Na2SO4 and 5 g of ZnS04 per litre and having a temperature of 950C, and was further processed as in Example 1.
The average properties of the fibres were as follows:
Titer (dtex): 5.5
Staple length (mm): 40
Crimping (%/cN/tex): 10.3
WRC according to DIN 53814 (%): 150
(COMPARATIVE) EXAMPLE 5
A viscose was prepared containing 6.0 % cellulose, 6.2 % soda lye, 1.5 % sulphur and 0.3 % of an alkylated aminoxethylate. This viscose was spun into a spin bath containing 65 g of H2SO4, 230 g of Na2SO4 and 40 g of ZnS04 per litre, at a ripening of 120 Hottenroth. The temperature of the spin bath
was 400C. The coagulated fibre cable was drawn by 100 % in a secondary bath containing 5 g of H2SO4
and 30 g of Na2SO4 per litre and having a temperature of 950C. Afterwards the continuous fibres were cut into staples, washed, bleached, avived and dried.
The fibres showed the following average properties:
Titer (dtex): 5.5
Staple length (mm): 40
Crimping (%/cn/tex): 10.4
WRC according to DIN 53814 (%): 86 (COMPARATIVE) EXAMPLE 6
179 g of a solution containing 6 % carboxymethylcellulose and 6 % soda lye were mixed into 1 kg of viscose containing 6.0 % cellulose, 5.7 % soda lye, 1.8 % sulphur and 0.2 % of an alkylated aminoxethylate. The mixture thus prepared contained 5.7 % cellulose, 5.6 % soda lye, 1.4 % sulphur and 0.2 % of an alkylated aminoxethylate and was spun at a ripening of 13.20 Hottenroth into a 400C hot spin bath containing 73 g of H2S04, 107 g of Na2SO4 and 62 g of ZnSO4 per litre.The fibre bundle was drawn by 108 % in a secondary bath containing 20 g of H2SO4 per litre and having a temperature of 950C, and was further processed as in (comparative) example 5.
The average properties of the fibres were as follows:
Titer (dtex): 5.5
Staple length (mm): 40
Crimping (96/cn/tex): 5.2
WRC according to DIN 53814 (%): 148
The properties determined at the test absorptive bodies are summarised in the following table::
Expansion in ml, after Total amount Liquid Suction s absorbed of retention body of blood-substitute capacity fibres liquid after according according 15 minutes, to Syngyna to Example 1 min 3 min 15 min in g test (9/9r 1 6.6 10.8 16J 22,2 7.93 2 6.0 11.3 16,3 21.5 7.68 3 4.1 9.6 149 19.8 7.07 4 6.5 12.6 14.9 20.0 7.14- 5 5A 10.7 12.6 17.0 6.07 6 42 9.0 11.8 18.5 6.61 The comparison shows that the values for the expansion after 15 minutes as well as the values for the liquid amount absorbed are increased with the materials comprised of the fibres according to the invention as compared to the absorptive bodies made of fibres according to (comparative) examples 5 and 6.
The method according to the invention will now be explained in even more detail by the following examples 7 and 8:
EXAMPLE 7
135 g of a solution containing 6 % carboxymethylcellulose with an average substitution degree of 0.97 and containing 6 % soda lye were mixed into 1 kg of viscose containing 6.1 % cellulose, 5.9% soda iye, 1.8 % sulphur and 0.3 % of an alkylated aminoxethylate.The mixture thus prepared contained 5.8 % cellulose, 5.8 % soda lye, 1.7 % sulphur and 0.3 % of an alkylated aminoxethylate and was spun at a ripening of 1140 Hottenroth into a spin bath containing 65 g of H2SO4, 230 gofNa2SO4and40g of ZnSO4 per litre and having a temperature of 4O0C. The fibre bundle was drawn by 100 % in a secondary bath containing 5 g of H2S04, 30 g of Na2SO4 and 5 g of ZnS04 per litre and having a temperature of 950C, and was further processed as in Example 1.
On account of a content of the fibres of carboxyl groups amounting to 1.44 %, a yield in carboxymethylcellulose of 65 % is obtained.
EXAMPLE 8
Into 1 kg of a viscose having a composition as that of Example 7, 146 g of a solution were mixed which contained 6 % of a slightlywet-linked carboxymethylcellulose with an average substitution degree of 0.87 and 6 % soda lye. The mixture thus prepared contained 5.9 % cellulose, 6.0 % soda lye, 1.8 % sulphur and 0.3 % of an alkylated aminoxethylate and was spun at a ripening of 11.00 Hottenroth into a spin bath containing 65 g of H2S04, 230 g of Na2SO4 and 40 g of ZnSO4 per litre and having a temperature of 400C. The fibre bundle was drawn by 108% in a secondary bath containing 5 g of H2S04, 30 g of Na2SO4 and 5 g of ZnS04 per litre and having a temperature of 950C, and was processed further as in Example 1.
On account of a content of the fibres of carboxyl groups amounting to 1.68 %, a yield in carboxymethylcellulose of 77 % was obtained.
Claims (7)
1. A mixed fibre exhibiting a high absorptive strength and a high liquid retention capacity on the basis of regenerated cellulose having a content of hydrophilic polymer additives, characterised in that the fibre contains, as a mixing component, anionically modified polysaccharides or their salts, and has a crimping of at least 7%, measured as the change in length under a load of 1 cN/tex.
2. A mixed fibre according to claim 1, characterised in that it comprises 99 to 60 %, preferably 90 to 80 % regenerated cellulose and 1 to 40 %, preferably 10 to 20 %, anionically modified polysaccharides or their salts.
3. A mixed fibre according to claim 2, characterised in that it comprises, as the mixing component, the ammonium or alkali-metal salt of, if desired slightly cross wet-linked, carboxymethylcellulose still soluble in a 6% aqueous soda lye, of carboxyethylcellulose, of carboxymethyl starch, of carboxyethyl starch or of a mixture of these substances.
4. A method of producing mixed fibres according to claims 1 to 3, characterised by
(a) mixing at least one anionically modified polysaccharide, a salt thereof or an aqueous solution thereof mixed if desired with an alkali metal hydroxide, with a viscose prepared of 25 to 40 % mass, preferably 30 to 35 % mass, of carbon disulphide, based on the cellulose, and having a content of 4 to 9 % mass of cellulose of an average polymerisation degree of 400 to 600, furthermore a content.of 0.2 to 0.3 % mass of a modifier, such as a polyalkyleneoxide, an alkoxylation product of ammonia, polyimines, fatty amines, fatty amides or fatty alcohols,
(b) spinning the mixture at a collochemical ripening of 5 to 300 Hottenroth (Ho), preferably 10 to 1 50 Ho, at a temperature of 35 to 500C, preferably 400C, into a spin bath containing 50 to 80 g of sulphuric acid, preferably 60 to 65 g of sulphuric acrid/1,180 to 300 g of sodium sulphate/1,30 to 50 g of zinc sulphate, preferably 40 g of zince sulphate/1, the resulting fibre bundle preferably being guided over a deflection, and
(c) drawing the fibre bundle by 70 te 120 %, preferably by 90 to 100 %, at a temperature of 80 to 1000C preferably 90 to 950C, in a secondary bath having a content of 2 to 30 g of sulphuric acid, preferably 5 to 10 g of sulphuric acid/1, of 5 to 80 g of sodium sulphate, preferably 20 to 40 g of sodium sulphate/1 and of 3 to 20 g of zinc sulphate, preferably 5 to 10 g of zinc sulphate/l, whereupon the anionically modified polysaccharides contained in the fibres, if desired, are converted into their alkali metal or ammonium salts.
5. Utilisation of the mixed fibre according to claims 1 to 3, the mixed fibre having a water retention capacity of at least 140% and a liquid retention capacity according to the Syngyna test of at least 7.0 g/g, for tampons in women's hygienics, in the dental and surgical technologies, for sanitary towels, babies' napkins, sick-sheets as well as for other disposable articles of general hygienics.
6. A mixed fibre substantially as hereinbefore described with references to the accompanying examples.
7. A method of producing mixed fibres substantially as hereinbefore described with reference to the accompanying examples.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0678979A AT363578B (en) | 1979-10-18 | 1979-10-18 | MIXED FIBERS BASED ON REGENERATED CELLULOSE OF HIGH SUCTION AND HIGH LIQUID RETENTION RESISTANCE, METHOD FOR THE PRODUCTION AND USE THEREOF |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2062652A true GB2062652A (en) | 1981-05-28 |
| GB2062652B GB2062652B (en) | 1983-08-10 |
Family
ID=3589776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8031680A Expired GB2062652B (en) | 1979-10-18 | 1980-10-01 | Absorbent regenerated cellulose fibres |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT363578B (en) |
| DE (1) | DE3036415A1 (en) |
| FR (1) | FR2467895A1 (en) |
| GB (1) | GB2062652B (en) |
| IT (1) | IT1143044B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995019795A1 (en) * | 1994-01-20 | 1995-07-27 | Bristol-Myers Squibb Company | Wound dressing |
| US5622666A (en) * | 1992-09-30 | 1997-04-22 | Novasso Oy | Modified viscose fibres and method for their manufacture |
| US6720057B1 (en) * | 1997-08-07 | 2004-04-13 | Achim Neumayr | Method for producing a cellulose fibre from hydrocellulose |
| EP2280099A1 (en) * | 2009-07-31 | 2011-02-02 | Kelheim Fibres GmbH | Regenerated cellulose staple fibre |
| US20120209234A1 (en) * | 2009-07-31 | 2012-08-16 | Kelheim Fibres Gmbh | Regenerated cellulose fiber |
| US10030323B2 (en) | 2013-04-05 | 2018-07-24 | Lenzing Aktiengesellschaft | Method for the production of polysaccharide fibers with an increased fibrillation tendency |
| US10196758B2 (en) | 2013-06-18 | 2019-02-05 | Lenzing Aktiengesellschaft | Polysaccharide fibers and method for producing same |
| US10221502B2 (en) | 2013-04-05 | 2019-03-05 | Lenzing Aktiengesellschaft | Polysaccharide fibers and method for the production thereof |
| US10220111B2 (en) | 2013-06-17 | 2019-03-05 | Lenzing Aktiengesellschaft | Highly absorbent polysaccharide fiber and use thereof |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE18995T1 (en) * | 1981-09-30 | 1986-04-15 | Leipzig Arzneimittel | ABSORBENT WOUND DRESSING AND METHOD OF PRODUCTION. |
| DE3141098C2 (en) * | 1981-10-16 | 1987-01-29 | Chemische Fabrik Stockhausen GmbH, 4150 Krefeld | Process for producing an absorbent material |
| DE3545250A1 (en) * | 1985-12-20 | 1987-06-25 | Stockhausen Chem Fab Gmbh | Process for the production of water-swellable, water-insoluble synthetic fibres, and the use thereof as an absorption material |
| DE19544097C1 (en) | 1995-11-27 | 1997-07-10 | Thueringisches Inst Textil | Moulding solution of cellulose and more water-soluble polysaccharide component |
| AT405949B (en) * | 1997-06-05 | 1999-12-27 | Chemiefaser Lenzing Ag | REGENERATED CELLULOSIC SHAPED BODY |
| AT508688B8 (en) | 2009-08-28 | 2011-10-15 | Chemiefaser Lenzing Ag | CARBOXYETHYL CELLULOSE FIBERS, THEIR USE IN WOUND ALLOYS AND HYGIENE ITEMS AND METHOD FOR THE PRODUCTION THEREOF |
| DE202011052225U1 (en) * | 2011-12-07 | 2013-03-11 | Mcairlaid's Vliesstoffe Gmbh & Co. Kg | Spigot or cylindrical hygiene body |
| AT514476A1 (en) * | 2013-06-17 | 2015-01-15 | Lenzing Akiengesellschaft | Polysaccharide fiber and process for its preparation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3847636A (en) * | 1972-06-05 | 1974-11-12 | Fmc Corp | Absorbent alloy fibers of salts of carboxyalkylated starch and regenerated cellulose |
| DE2638654C3 (en) * | 1976-08-27 | 1980-10-02 | Vereinigte Papierwerke Schickedanz & Co, 8500 Nuernberg | Highly absorbent fibrous material for use in hygienic articles |
| BE876948A (en) * | 1977-04-22 | 1979-10-01 | Avtex Fibers Inc | MASS OF ALLIED RAYON FIBERS WITH LARGE FLUID RETENTION CAPACITY |
-
1979
- 1979-10-18 AT AT0678979A patent/AT363578B/en active
-
1980
- 1980-09-26 DE DE19803036415 patent/DE3036415A1/en not_active Withdrawn
- 1980-10-01 GB GB8031680A patent/GB2062652B/en not_active Expired
- 1980-10-10 IT IT49870/80A patent/IT1143044B/en active
- 1980-10-17 FR FR8022258A patent/FR2467895A1/en active Granted
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5622666A (en) * | 1992-09-30 | 1997-04-22 | Novasso Oy | Modified viscose fibres and method for their manufacture |
| WO1995019795A1 (en) * | 1994-01-20 | 1995-07-27 | Bristol-Myers Squibb Company | Wound dressing |
| US6720057B1 (en) * | 1997-08-07 | 2004-04-13 | Achim Neumayr | Method for producing a cellulose fibre from hydrocellulose |
| EP2280099A1 (en) * | 2009-07-31 | 2011-02-02 | Kelheim Fibres GmbH | Regenerated cellulose staple fibre |
| WO2011012423A1 (en) * | 2009-07-31 | 2011-02-03 | Kelheim Fibres Gmbh | Regenerated cellulose staple fibre |
| US20120209234A1 (en) * | 2009-07-31 | 2012-08-16 | Kelheim Fibres Gmbh | Regenerated cellulose fiber |
| US9279196B2 (en) * | 2009-07-31 | 2016-03-08 | Kelheim Fibres Gmbh | Regenerated cellulose fiber |
| US10030323B2 (en) | 2013-04-05 | 2018-07-24 | Lenzing Aktiengesellschaft | Method for the production of polysaccharide fibers with an increased fibrillation tendency |
| US10221502B2 (en) | 2013-04-05 | 2019-03-05 | Lenzing Aktiengesellschaft | Polysaccharide fibers and method for the production thereof |
| US10220111B2 (en) | 2013-06-17 | 2019-03-05 | Lenzing Aktiengesellschaft | Highly absorbent polysaccharide fiber and use thereof |
| US10196758B2 (en) | 2013-06-18 | 2019-02-05 | Lenzing Aktiengesellschaft | Polysaccharide fibers and method for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1143044B (en) | 1986-10-22 |
| GB2062652B (en) | 1983-08-10 |
| FR2467895A1 (en) | 1981-04-30 |
| ATA678979A (en) | 1981-01-15 |
| IT8049870A0 (en) | 1980-10-10 |
| DE3036415A1 (en) | 1981-04-30 |
| FR2467895B1 (en) | 1984-03-16 |
| AT363578B (en) | 1981-08-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |