Classifications

• • 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
  • D04H1/42—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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/435—Polyesters
• • 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
  • D04H1/42—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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/425—Cellulose series
  • D04H1/4258—Regenerated cellulose series
• • 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
  • D04H1/645—Impregnation followed by a solidification process
• • 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
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/013—Regenerated cellulose series
• • 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
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
  • D04H3/12—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with filaments or yarns secured together by chemical or thermo-activatable bonding agents, e.g. adhesives, applied or incorporated in liquid or solid form
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/913—Material designed to be responsive to temperature, light, moisture
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
  • Y10T442/2861—Coated or impregnated synthetic organic fiber fabric
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
  • Y10T442/2861—Coated or impregnated synthetic organic fiber fabric
  • Y10T442/291—Coated or impregnated polyolefin fiber fabric

Definitions

• the invention relates to a method for producing bound textile fabrics by applying an acrylic resin dispersion which is free of formaldehyde and formaldehyde-releasing substances.
• the invention further relates to the textile fabrics produced by the method.
• Aqueous acyl resin dispersions whose plastic content contained self-crosslinking amide methylol groups have hitherto been used frequently for the production of bound textile fabrics which are notable for high wet strength and for water and wash liquor resistance.
• binders for textile fabrics which provide sufficient wet strength, water and wash liquor resistance for practical purposes, but do not give off any formaldehyde when heated.
• EP-A 19 169 describes aqueous dispersions which are suitable as binders for nonwoven fabrics and which contain, as binders, a copolymer of acrylic or methacrylic esters or other monomers and 3 to 10% by weight of units of acrylamidoglycolic acid. It is therefore a binder that does not release formaldehyde when heated. However, since the desired wet strength of the textile fabrics finished with them is not achieved with these binders, small proportions of N-methylolacrylamide are polymerized into the copolymers, thereby increasing the wet strength of the finished fiber structures. however, the risk of formaldehyde release occurs again.
• EP-A 96 230 describes coating compositions which contain, as self-crosslinking binders, copolymers of acrylic monomers and a crosslinking system composed of methyl acrylamido-glycolic acid methyl ether and hydroxyl, carboxy or amido-functional comonomers. When heated, condensation reactions of the monomer units, the crosslinker system mentioned, occur. It is not known to use such copolymers as binders for textile fabrics.
• the invention has for its object to produce bonded fabrics with improved wet strength, from whose binder no formaldehyde is released when heated.
• the bonded fabrics made according to the invention are distinguished from those with conventional formaldehyde-free binders by a significantly increased wet strength. This is important in cases where the bound textile fabric is exposed to mechanical stress during manufacture, further processing or when used in the wet state.
• a typical application is the production of bonded nonwovens based on synthetic fibers, in particular polyester fibers, which are used for the production of so-called disposable diapers.
• the bonded non-woven fabrics form the outer cover of the diaper, which envelops a highly absorbent filler. Due to the low water absorption of the synthetic fibers, the outer shell still appears relatively dry when the coated insert has absorbed considerable amounts of liquid. However, it is essential that the outer casing does not tear under mechanical stress and exposes the liquid-saturated insert.
• the increased wet strength of the textile fabrics bound in the sense of the invention is based on the units of an acrylamidoglycolic acid monomer of the formula as a component of the copolymer contained in the aqueous dispersion.
• R, R 'and R'' have the meaning given in claim 1.
• R 'and R'' can be the same alkyl radicals, especially methyl groups.
• other alkyl radicals with preferably no more than 8 carbon atoms are also suitable, in particular lower alkyl radicals with up to 4 carbon atoms.
• the acrylic or methacrylic acid alkyl esters forming the main part of the copolymer, or their mixture with styrene, are selected in a manner known per se so that the dynamic freezing temperature T 1max is not more than 60 °, preferably not more than 20 ° C.
• the copolymer consists of 30 to 60 wt .-% of monomer units that give hard homopolymers, such as methyl, ethyl, propyl, isopropyl methacrylate or styrene, and about 20 to 70% acrylic acid esters of C1 ⁇ 8 alkanols or methacrylic acid esters of C4 ⁇ 8 alkanols.
• Unsaturated carboxylic acids such as acrylic or methacrylic acid are suitable as further monomer components Amounts of about 1% by weight improve the stability of the dispersion.
• Crosslinking comonomers such as glycol dimethacrylate, allyl methacrylate, methylene-bis-methacrylamide or butanediol diacrylate, can also improve the strength properties of the binder in small amounts. Too high a proportion of crosslinking agents would interfere with the film formation process and should therefore be avoided.
• the comonomers which can also be used also include acrylonitrile and methacrylonitrile, vinyl acetate, vinyl chloride, vinylidene chloride and others. Hydroxyesters and amides of acrylic or methacrylic acid are generally not present in the copolymers.
• the acrylic resin dispersions can be prepared by all common methods of emulsion polymerization. They can contain anionic, cationic or non-ionic emulsifiers or compatible mixtures thereof. They are expediently produced with solids contents of 50 to 70% by weight.
• the method of the invention is suitable for binding and solidifying textile fabrics of all kinds; these include woven fabrics, knitted fabrics, wadding and in particular non-woven nonwovens.
• the invention is not restricted to certain types of fibers, but synthetic fibers or fiber mixtures containing synthetic fibers are fundamentally preferred. These mixtures can contain, for example, 70% or more of synthetic fibers.
• the synthetic fibers considered include fibers made from regenerated cellulose, such as rayon or rayon, and in particular fully synthetic fibers, such as polyester or polypropylene fibers.
• Preferred textile fabrics are constructed from 70 to 100% by weight of polyester fibers and 0 to 30% by weight of cellulose.
• the preparation of the dispersion for the consolidation of fiber structures depends on the application process and the requirements placed on the end product.
• the additives used in these processes like wetting agents. Anti-foaming agents, thermosensitizers. Plasticizers and smoothing agents. Antistatic. Antimicrobials. Dyes, fillers, flame retardants, fragrances, etc. can also be used.
• the dispersions are diluted with water to a binder content of 10 to 40 percent by weight.
• the viscosity of the diluted dispersion can range from 10 to 10,000 mPa.s.
• For the consolidation of wadding for example made of polyester, polyamide or polyacrylonitrile fibers, an approximately 15 to 25% liquor is sprayed on.
• Compact nonwovens and needle felts can be solidified well by impregnation with 10 to 40% liquors and subsequent squeezing and drying.
• Light fiber fleeces can also be consolidated by foam impregnation; To do this, foaming agents and foam stabilizers are added to the approximately 10 to 25% dispersion and foamed with air up to a liter weight of 100 to 300 g. The impregnation is expediently carried out on the horizontal foulard.
• Very light non-woven fabrics can be partially solidified by printing with pastes that contain 20 to 40% binder and are adjusted to a viscosity of 4000 to 8000 mPa.s. Needle felts for high-quality floor and wall coverings are preferably splashed with thickened, possibly foamed liquors. Finally, nonwoven bonding is also possible by brushing.
• the solidified fiber structures generally contain between 5 and 100%, based on the fiber weight, of binder.
• the preferred binder content is between 10 and 30% by weight.
• the fiber structures equipped according to the invention obtain their favorable application properties only by drying at dryer temperatures above 110 ° to about 200 °, preferably in the range between 120 and 160 ° C.
• a crosslinking agent for example glyoxal, can be added to the dispersion.
• thermally pre-consolidated polyester fleece with a weight per unit area of approx. 18 g per m2 is impregnated with the plastic dispersion diluted to approx. 25% dry matter, excess dispersion squeezed out with the padding so that a resin coating of approx. 15% is achieved.
• the damp fleece is dried in the stenter at 140 ° C for 5 minutes.
• the breaking resistance is determined according to DIN 53 857, Part 2 on dry fleece (F) and on wet fleece (F n ) after 1 hour of water storage in the middle of a tensile testing machine that corresponds to DIN 51 221.
• a chromatography paper No. 1, Whatman
• the breaking resistance is determined according to DIN 53 112, sheets 1 and 2.
• Example 1 illustrates the invention using dispersion A.
• Example 2 is a comparative test with comparative dispersion B which was not prepared according to the teaching of the invention.
• Example 3 is a comparison test according to DE-OS 32 02 122.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Dispersion Chemistry (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Nonwoven Fabrics (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)
• Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
• Materials For Medical Uses (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6263831

Family Applications (1)

Country Status (7)

Families Citing this family (6)

Family Cites Families (4)

• 1985
  • 1985-02-28 DE DE19853507154 patent/DE3507154A1/de active Granted
  • 1985-12-17 NO NO855106A patent/NO164181C/no not_active IP Right Cessation
• 1986
  • 1986-02-11 US US06/830,507 patent/US4689264A/en not_active Expired - Lifetime
  • 1986-02-19 DE DE8686102172T patent/DE3684937D1/de not_active Expired - Lifetime
  • 1986-02-19 EP EP86102172A patent/EP0193107B1/de not_active Expired - Lifetime
  • 1986-02-25 FI FI860802A patent/FI84188C/fi not_active IP Right Cessation
  • 1986-02-25 DK DK087686A patent/DK165844C/da not_active IP Right Cessation
  • 1986-02-27 JP JP61040518A patent/JPS61201061A/ja active Pending

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