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
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/4358—Polyurethanes
• • 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
  • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
  • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
  • D04H1/724—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged forming webs during fibre formation, e.g. flash-spinning
• • 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
  • D04H3/005—Synthetic yarns or filaments
  • D04H3/009—Condensation or reaction polymers
• • 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
  • D04H3/16—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 bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

• the present invention relates to a method for producing carrier and Release agent-free, thermally activated nonwovens based on hydroxyl polyester polyurethanes.
• thermo-activatable films based on hydroxyl polyester polyurethanes Disadvantages are their low gas permeability, as well as their hardening of the handle, which is particularly important when gluing textiles, and beyond the relatively high basis weight, which requires a higher material expenditure.
• thermo-activatable is therefore Films based on hydroxyl polyester polyurethanes for technical applications, such as. Laminating parts for the automotive interior, limited.
• a larger and closed surface application of adhesive is necessary, e.g. Restoring forces of to catch deep-drawn soft PVC films, there are sufficient fields of application, where you can work with less adhesive and a closed film-like surface structure of the applied adhesive only is a disadvantage.
• thermo-activatable ones to be used for bonding various substrates Films can be produced using a wide variety of processes.
• thermoplastic elastomers e.g. Polyurethanes
• monofilm blown film extrusion process thermoplastic elastomers
• the object of the present invention was therefore to overcome the disadvantages mentioned Use of solvent-based adhesives as well as when using avoid solvent-free adhesives such as foils.
• Some of the above Disadvantages can be caused by the use of thermo-activated nonwovens Adhesion of different substrates can be avoided, especially if Manufacture of the nonwovens using the meltblown process (e.g. REICOFIL® meltblown process) is applied.
• the invention therefore relates to a process for the production of carrier-free and release agent-free, thermally activatable nonwovens based on hydroxyl polyester polyurethanes with viscosities from 600 to 3500 mPa.s, measured as solution viscosity in methyl ethyl ketone (15%) and with basis weights in the range from 5 to 200 g / m 2 , characterized in that the nonwovens are formed by means of a melt-blowing process (eg REICOFIL® melt-blown process) at melt temperatures of 230 to 260 ° C, using a storage belt, the material of which has a surface tension of 18.5 x 10 -5 N / cm to 46 x 10 -5 N / cm.
• a melt-blowing process eg REICOFIL® melt-blown process
• the carrier and release agent-free, thermo-activatable nonwovens produced by the process according to the invention preferably have basis weights in the range from 8 to 50, very particularly preferably 10 to 30 g / m 2 .
• the basis weights of the nonwovens depend on the substrates used in the bonding and, depending on requirements, can also contain higher basis weights, especially if unevenness has to be compensated for during the bonding.
• Particularly suitable hydroxyl polyester polyurethanes are those which by reacting organic isocyanates with preferably difunctional, alcoholic hydroxyl-containing polyester polyols and low molecular weight Diols as chain extenders while maintaining an NCO / OH equivalent ratio from 0.9: 1 to 0.999: 1 are available, as in EP 0 158 086 and DE-PS 1 256 822, DE-PS 2 161 340, DE-PS 3 502 379.
• Suitable dihydroxy polyesters are in particular those of more than 600, preferably between 1200 and 6000, particularly preferably between 2000 and 4000 g / mol, lying molecular weight, as they are known from alkanedicarboxylic acids with preferably 6 carbon atoms and alkane diols with preferably at least 4 carbon atoms are accessible.
• Suitable dicarboxylic acids are, for example Adipic acid, sebacic acid, pimilic acid, suberic acid, azelaic acid, Sebacic acid.
• Suitable alkanediols are, for example, 1,4-butanediol, 1,5-pentanediol, or 1,6-hexanediol.
• the chain extenders are in particular diols or diol mixtures of the molecular weight range 62 to 300, preferably 62 to 150 g / mol.
• Suitable such diols are e.g. Alkanediols with preferably 4 to 6 carbon atoms such as 1,4-butanediol, 1,5-pentanediol, Hexanediol-1,6.
• diisocyanates examples include 1,6-diisocyanatohexane, 1,4-diisocyanatocyclohexane, 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethyl-cyclohexane, methylene-bis- (4-isocyanatocyclohexane), 2,4- and optionally 2,6-diisoocyanatotoluene, 4,4'-diisocyanatodiphenylmethane, 4,4'-diisocyanatodiphenylpropane-2,2 or any Mixtures of such isocyanates. It is particularly preferred as the reaction component 4,4'-diisocyanatodiphenylmethane.
• the nonwovens according to the invention are produced by the meltblown process prepared, in particular melt temperatures (measured before Unwinding nozzles) from 230 to 260 ° C.
• the meltblown process is described in more detail in DE-OS 19 64 060 and in DE-OS 23 08 242 and consists essentially of a specially designed extruder downstream molding tool for polymer threads, the main feature of which there is that a directed, heated air flow can be assigned to each individual nozzle, which ensures that the emerging polymer threads stretch and be demolished in a controlled manner.
• the hot air can come from two sides close-fitting slots are brought up to the polymer melt or the Polymer melt from a ring hole around the inner melt hole flow around.
• the spun threads are deposited on a moving one Holding device, e.g. a rotating conveyor belt.
• a moving one Holding device e.g. a rotating conveyor belt.
• a storage belt is used, the material of which has a surface tension of preferably 18.5 x 10 -5 to 33 x 10 -5 N / cm. Teflon-coated textile fabrics, for example, are suitable as materials for the storage belt.
• Manufactured nonwoven can use a wide variety of processes come.
• pre-coated substrates e.g. soft PVC foam films, TPU films
• pre-coated substrates e.g. soft PVC foam films, TPU films
• the fleece produced by the method according to the invention connect a large variety of substrates with themselves or with each other.
• these are in particular various textile fabrics based on cotton, cotton blended fabrics, Wool, wool blend fabrics, polyester and polyamide fabrics as well To name polyolefins.
• a limited number of raw materials are known in the prior art, which by means of the melt-blowing technique can be formed into nonwovens.
• these are polymers which solidify completely amorphous or partially crystalline, e.g. Polypropylene and polystyrene. These polymers generally have the property to have a completely tack-free surface immediately after falling below approx. 70 ° C.
• Hydroxylpolyesterpolyurethane with segmented structure of soft and Hard segments are more critical in this regard. So is to recrystallize the in the extrusion process processed hydroxyl polyester polyurethane, in comparison to the aforementioned polymers, much longer time is required, and in any case falling below 50 ° C melt temperature in the molded extrudate. This The behavior of segmented polyester urethanes generally leads to mentioned disadvantages of the non-release or spacer-free production and Blocking of these extrudates on the roll.
• the fleece obtained Due to the low fiber titer (approx. 0.1 dtex), the fleece obtained is characterized by a large surface coverage (opacity) even with small application quantities. With, for textile applications, even high application quantities of 30 g / m 2 , a soft feel is retained. Depending on the order volume, air permeability can be set specifically.
• thermoplastic Elastomeric hydroxyl polyester polyurethanes were placed in an air dryer type SOMOS® predried over a period of 12 hours.
• the extruder and mold temperatures were set so that a melt temperature of 250 ° C was achieved in front of the unloading nozzles.
• the hydroxyl polyester polyurethane solution viscosity: 2000 mPa.s
• the spinning pump output was increased to rpm. set.
• the resulting extrusion rate was 22 kg / h.
• a melt pressure of the extruder / nozzle of 40/16 bar is established.
• the polymer threads emerging from the melt nozzles were placed after stretching by the compressed air preheated to 220 ° C.
• the extruder and mold temperatures were set so that a melt temperature of 250 ° C was achieved in front of the unloading nozzles. With a screw speed of 5 rpm. the hydroxyl polyester polyurethane (solution viscosity: 1200 mPa.s) was extruded. The spinning pump output was increased to 4 rpm. set. The resulting extrusion rate was 22 kg / h. A melt pressure of the extruder / nozzle of 40/30 bar is established.
• the polymer threads emerging from the melting nozzles were placed on a circulating conveyor belt with a surface tension of 30 ⁇ 10 -5 N / cm and fed from there to an intermediate take-off where the edge trimming took place .
• the fleece was then wound onto 1000 mm cardboard cores. Different basis weights were set by changing the spinning belt speed and / or the throughput. 200 running meters were wound up per attempt. The processing of the cardboard core could be carried out at any time without any problems.
• Example 3 The procedure was analogous to that in Example 3 with a soft PVC (foam) film web.
• the adhesion of the melt-blown spunbonded fabric made of the hydroxyl polyester polyurethane was sufficient to easily wind and unwind the coated Ensure the web.
• Example 3 Analogously to Example 3, the hydroxyl polyester polyurethane was applied directly to a cotton fabric as a fleece. The adhesion of the fleece to the textile web was excellent here too. Bonding this fabric, coated with different amounts of material, to an uncoated cotton fabric provided the peel strengths listed in Table 1 below.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Laminated Bodies (AREA)
• Nonwoven Fabrics (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Polyurethanes Or Polyureas (AREA)
• Adhesive Tapes (AREA)
• Paints Or Removers (AREA)
• Artificial Filaments (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=6489809

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (8)

• 1993
  • 1993-06-07 DE DE4318887A patent/DE4318887A1/de not_active Withdrawn
• 1994
  • 1994-05-25 ES ES94108039T patent/ES2136140T3/es not_active Expired - Lifetime
  • 1994-05-25 EP EP94108039A patent/EP0628650B1/de not_active Expired - Lifetime
  • 1994-05-25 DE DE59408568T patent/DE59408568D1/de not_active Expired - Fee Related
  • 1994-06-01 JP JP6140693A patent/JPH07310270A/ja active Pending
  • 1994-06-03 CA CA002125076A patent/CA2125076A1/en not_active Abandoned

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