EP0223908B1 - Verfahren zum kontinuierlichen Herstellen von stark wasserabsorbierenden, nichtgewobenen Komplexen - Google Patents

Verfahren zum kontinuierlichen Herstellen von stark wasserabsorbierenden, nichtgewobenen Komplexen Download PDF

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Publication number
EP0223908B1
EP0223908B1 EP86107597A EP86107597A EP0223908B1 EP 0223908 B1 EP0223908 B1 EP 0223908B1 EP 86107597 A EP86107597 A EP 86107597A EP 86107597 A EP86107597 A EP 86107597A EP 0223908 B1 EP0223908 B1 EP 0223908B1
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EP
European Patent Office
Prior art keywords
nonwoven
monomer
web
fibrous web
activator
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 - Lifetime
Application number
EP86107597A
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English (en)
French (fr)
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EP0223908A3 (en
EP0223908A2 (de
Inventor
Tomio Nakazawa
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Individual
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Publication of EP0223908A3 publication Critical patent/EP0223908A3/en
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Publication of EP0223908B1 publication Critical patent/EP0223908B1/de
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/587—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used

Definitions

  • a 20 to 60 g/m2 parallel web and a random web are formed from a fibrous mixture by the use of the card process, the air laid process, or other similar process. Subsequently, these webs are treated in a cylindrical drier or other heat treatment apparatus at a temperature of 150 to 250 °C so as to couple the fibers.
  • An activator capable of causing polymerizaiton reaction rapidly in a predetermined period of time should form a redox system with the aformentioned oxidizing radical polymerization initiator.
  • amines e.g. aniline, monoethanol amine, diethanol amine, triethanol amine and dimethyl aniline
  • water soluble reducing agents e.g. sodium sulfite, sodium hydrogensulfite, sodium thiosulfate, copper sulfate, ferrous sulfate, and L-ascorbic acid and salts thereof, erysorbic acid (isoascorbic acid) and salts thereof, polyphenols, such as gallic acid, and derivatives thereof.
  • the amount of the activator added is preferably 0.01 to 4% by weight of the monomer.
  • the following advantages can be obtained: (1) since the polymerization speed is high, continuous production can be effected easily, and it is possible to use compact apparatuses for produciton; (2) since the reaction is carried out uniformly, it is possible to effect the production under smooth and stable operating conditions, and (3) the degree of crosslinking and the degree of polymerization can be controlled.
  • a carded web was made of 80% of 8d x 51 mm hollow conjugated polyester fibers (made by Mitsubishi Rayon Co., Ltd.) and 20% of 3d x 51 mm polyester heat-fusible fibers (marketed by Uni-Chika Co., Ltd. under the reference Melty). This web was led continuously into an oven wherein 250°C heated-air was circulated, and it was possible to obtain a nonwoven fabric in which heat-fusible fibers were melted and the web-constituting components bonded together.
  • the porperties of the nonwoven fabric were as follows: basis weight: 30 g/cm2 thickness: 5 mm apparent density: 0.006 g/cm3 compression recovery rate: 85%
  • a 70 wt.% aqueous potassium acrylate solution was prepared with the same apparatus as the one used in Example 1 under cooling condition, employing sodium hydroxide. The neutralization rate was 75%. N-methylene bis-acrylamide was then added to this aqueous monomer solution so that its concentration would become 0.3% by weight of the monomer. Then, as the oxidizing radical polymerization initiator hydrogen peroxide was added to the mixed solution and was mixed so that its concentration would become 0.2% by weight of the pure monomer.
  • a mixed monomer solution was adhered to one side of the aforementioned nonwoven fabric by the roll coater such that the pickup rate of about 500 wt.% was achieved.
  • the above-described monomer-adhered nonwoven fabric was passed in a falling state through the reaction tank heated to 100 °C. Subsequently, a 7% aqueous monoethanolamine solution was sprayed perpendicularly on the monomer-coated surface of the nonwoven fabric in the upper layer of the reaction tank, and the polymerization reaction was completed in approximately 15 minutes. Consequently, it was possible to obtain a highly water-absorbent complex having a structure in which polymers having a larger particle size were distributed on one side of the nonwoven fabric.
  • Example 1 150g/m2 wooden pulp mat (NBKP made by Rayonier Co., Ltd.) was bonded to both sides of the complex obtained in Example 1 by applying water to the surface of the complex, and pressing was effected for this structure.
  • This structure was cut into dimensions of 25 cm (hight) x 33 cm (length). After removing the absorbent of a commercially available paper diaper, the structure was inserted into said paper diaper and a consumer test was carried out. It was found that the articles according to the present invention have doubled its rate of water absorption in comprison with commercially available ones. Thus, it was possible to obtain the absorbent in which the rate of occurrence of leakage was extremely low even without replacement at night.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Polymerization Catalysts (AREA)
  • Polymerisation Methods In General (AREA)

Claims (5)

  1. Verfahren zur kontinuierlichen Herstellung eines nicht gewebten, in hohem Maße wasserabsorbierenden Komplexes, worin nach Anhängen einer wäßrigen Lösung eines polymerisierbaren Monomers, das aus einer Acrylsäure besteht oder im wesentlichen aus einer Acrylsäure besteht, an einen kontinuierlichen, faserartigen Vliesstoff das polymerisierbare Monomer polymerisiert wird, dadurch gekennzeichnet, daß man kontinuierlich mittels Imprägnieren, Beschichten und/oder Sprühen eine einheitliche Mischlösung zusetzt, die dadurch erhalten wird, daß man der wäßrigen Lösung des polymerisierbaren Monomers ein lösliches Vernetzungsmittel zusetzt, das gewählt ist unter Verbindungen mit Eigenschaften einer Copolymerisation mit dem polymerisierbaren Monomer, Verbindungen mit Reaktivität mit einer funktionellen Gruppe des polymerisierbaren Monomers oder Verbindungen, die Eigenschaften beider genannten Typen von Verbindungen aufweisen, sowie einen oxidierenden Radikalpolymerisations-Initiator zusetzt, der in der Lage ist, ein Redoxsystem mit einem Amin und einem Reduktionsmittel auszubilden, die einen bestimmten Grad an Löslichkeit in bezug auf das Monomer oder Wasser aufweisen und eine latente Aktivität haben, so daß der Initiator in Gegenwart eines Aktivators, der in der Lage ist, ein Redoxsystem mit dem Initiator auszubilden, eine Polymerisationsinitiationsreaktion gegenüber dem kontinuierlichen faserartigen Vliesstoff mit Porosität und kompressionsbeständiger Stabilität zeigt und nachfolgend eine schnelle Polymerisationsreaktion herbeiführt, indem man dem Gewebe den Aktivator zusetzt, um den Radikalpolymerisationsinitiator zu aktivieren, und dadurch ein Polymer in dem faserartigen Gewebe bildet.
  2. Verfahren nach Anspruch 1, worin der Radikalpolymerisations-Initiator ein Peroxid ist und der Aktivator ein Amin ist, das in der Lage ist, ein Redoxsystem mit dem Peroxid zu bilden.
  3. Verfahren nach Anspruch 1, worin der Radikalpolymerisations-Initiator ein Peroxid ist und der Aktivator ein wasserlösliches Reduktionsmittel ist, das in der Lage ist, ein Redoxsystem mit dem Peroxid zu bilden.
  4. Verfahren nach Anspruch 1, worin der kontinuierliche, faserartige Vliesstoff aus hydrophilen synthetischen Fasern hergestellt ist und eine scheinbare Dichte von 0,05 g/cm³ oder darunter aufweist.
  5. Verfahren nach Anspruch 1, worin der kontinuierliche, faserartige Vliesstoff vornehmlich aus Polyesterfasern einer Stärke von 4 d oder darüber mit einem hohlen und unregelmäßig geformten Querschnitt aufgebaut ist.
EP86107597A 1985-11-18 1986-06-04 Verfahren zum kontinuierlichen Herstellen von stark wasserabsorbierenden, nichtgewobenen Komplexen Expired - Lifetime EP0223908B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP256594/85 1985-11-18
JP25659485 1985-11-18

Publications (3)

Publication Number Publication Date
EP0223908A2 EP0223908A2 (de) 1987-06-03
EP0223908A3 EP0223908A3 (en) 1989-07-12
EP0223908B1 true EP0223908B1 (de) 1993-02-24

Family

ID=17294796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107597A Expired - Lifetime EP0223908B1 (de) 1985-11-18 1986-06-04 Verfahren zum kontinuierlichen Herstellen von stark wasserabsorbierenden, nichtgewobenen Komplexen

Country Status (3)

Country Link
EP (1) EP0223908B1 (de)
DE (1) DE3687823T2 (de)
ES (1) ES2001289A6 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6872275B2 (en) 2001-12-14 2005-03-29 Kimberly-Clark Worldwide, Inc. Process for adding superabsorbent to a pre-formed fibrous web via in situ polymerization
US6918981B2 (en) 2001-12-14 2005-07-19 Kimberly-Clark Worldwide, Inc. Process for adding superabsorbent to a pre-formed fibrous web using two polymer precursor streams
US7018497B2 (en) 2001-12-14 2006-03-28 Kimberly-Clark Worldwide, Inc. Method of making an absorbent structure having high integrity

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5972505A (en) * 1989-04-04 1999-10-26 Eastman Chemical Company Fibers capable of spontaneously transporting fluids
US5268229A (en) * 1992-07-23 1993-12-07 Eastman Kodak Company Spinneret orifices and filament cross-sections with stabilizing legs therefrom
DE4420088C3 (de) * 1994-06-09 2001-02-15 Stockhausen Chem Fab Gmbh Verfahren zur Herstellung eines wasserabsorbierenden Flächengebildes und dessen Verwendung
US7338625B2 (en) 2002-09-18 2008-03-04 Kimberly-Clark Worldwide, Inc. Methods of restoring elasticity after stiffening treatments
DE102013003755A1 (de) * 2013-03-06 2014-09-11 Carl Freudenberg Kg Belüftungseinsatz

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157562A (en) * 1959-07-27 1964-11-17 Rohm & Haas Bonded non-woven fibrous products and methods of making them
US4304817A (en) * 1979-02-28 1981-12-08 E. I. Dupont De Nemours & Company Polyester fiberfill blends
DE2920377A1 (de) * 1979-05-19 1980-12-04 Basf Ag Binde-, impraegnier- und ueberzugsmittel auf basis einer waessrigen dispersion eines amidgruppenhaltigen copolymerisats

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6872275B2 (en) 2001-12-14 2005-03-29 Kimberly-Clark Worldwide, Inc. Process for adding superabsorbent to a pre-formed fibrous web via in situ polymerization
US6918981B2 (en) 2001-12-14 2005-07-19 Kimberly-Clark Worldwide, Inc. Process for adding superabsorbent to a pre-formed fibrous web using two polymer precursor streams
US7018497B2 (en) 2001-12-14 2006-03-28 Kimberly-Clark Worldwide, Inc. Method of making an absorbent structure having high integrity

Also Published As

Publication number Publication date
ES2001289A6 (es) 1988-05-01
DE3687823T2 (de) 1993-09-30
EP0223908A3 (en) 1989-07-12
EP0223908A2 (de) 1987-06-03
DE3687823D1 (de) 1993-04-01

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