SK94293A3 - Pressure-sensitive adhesive glue and thereable produced adhesive tapes - Google Patents

Abstract

Pressure-sensitive contact adhesive which is characterised in that it contains a mixture of A) from 0 to 90% by weight of acrylate-vinyl acetate-acrylic acid copolymer having 2 to 8 carbon atoms in the alcohol component of the acrylate and, based on the copolymer, from 10 to 60% by weight of vinyl acetate and from 1 to 10% by weight of acrylic acid (Fikentscher K value in the range from 50 to 110, measured in accordance with DIN 51562 in tetrahydrofuran), B) from 10 to 80% by weight of acrylate-acrylic acid-N-methylolmethacrylamide copolymer having 4 to 8 carbon atoms in the alcohol component of the acrylate and, based on the copolymer, from 1 to 10% by weight of acrylic acid and from 1 to 10% by weight of self-crosslinking N-methylolmethacrylamide (Fikentscher K value in the range from 70 to 130, measured in accordance with DIN 51562 in tetrahydrofuran), C) from 0 to 90% by weight of acrylate-ethyl acrylate-N-methylolmethacrylamide-acrylic acid copolymer having 4 to 8 carbon atoms in the alcohol component of the acrylate and, based on the copolymer, from 1 to 10% by weight of acrylic acid and from 1 to 10% by weight of self-crosslinking N-methylolmethacrylamide and from 20 to 80% by weight of ethyl acrylate (Fikentscher K value in the range from 80 to 130, measured in accordance with DIN 51562 in tetrahydrofuran), D) from 0 to 25% by weight of phthalic esters (phthalates) having 2 to 12 carbon atoms in the alcohol component of the ester, where at least one of components A) and C) is present in addition to component B). It is suitable for the production of manually tearable contact adhesive tapes for the embroidery and textile industries.

Description

Technical field

The present invention relates to a pressure-sensitive adhesive adhesive produced by pressure-adhesive adhesive tape which can be used in the embroidery and textile industries to fix embroidered fabrics to work machines. In the context of the present invention, the term adhesive tapes refers not only to tapes but also to flat formations, for example sheets or sheets.

BACKGROUND OF THE INVENTION

Embroideries embroider textile motifs using computer-controlled embroidery machines, which, depending on the type and size, are equipped with a different number of embroidery heads, each embroidery head being equipped with multiple needles for differently colored threads. The embroidered textile is fixed on the nonwoven paper or other hand torn from another material.

The fixation item is glued into the border frame, which, according to the computer program, moves so that the needle produces the desired embroidery motif at a speed of up to 700 stitches per minute.

Preferred flat materials are fibrous webs, in particular web paper and long fiber special papers. The fiber webs are textile flat formations of textile fibers whose cohesiveness is due to the inherent adhesion of the fibers. The fiber webs produced by consolidating the spun fibers are called spun webs.

Generally, a nonwoven is a textile product in which the fibers are evenly distributed. The fibers may or may not be oriented. Unlike woven fabrics, fibers are not processed into yarns and fabrics, but are joined by kneading and splitting. The fibers are joined together in a mechanical, chemical and / or physical manner.

The fleece products can be very different in their construction and can be cohesive to intensely bound, they can be soft to rigid, compact to large. The weaker the fiber orientation, the better the material can be sheared so that the shear loss is only a very small extent. The fiber type, fiber uniformity, length of lintel and fiber density as well as the binders used are decisive for the properties of the fiber webs.

Cellulose-based vegetable fibers, animal protein-based wool fibers, viscose and acetate cellulose fibers, and synthetic fibers based on polyamides, polyacrylonitriles, polyvinylderivatives of polyesters and polyolefins are used as nonwoven fibers. Thus, in another sense, the term fibrous web includes cellulose-based webs, although these are often rated as a special class of substances.

A prerequisite for the use of fiber webs, specialty papers, or other flat materials as fabric backing in high-rise operations is that the materials are puncture-resistant and delicate, so that they embed well on the embroidered fabric and improve the plasticity of the embroidery motif. Furthermore, they must also be easily and easily removed from the edge of the motif after embroidering.

Previously, embroideries sprayed the nonwoven materials by spraying an adhesive composed of polyvinyl ester copolymers such as polyacrylic acid copolymers and dissolved in the fused hydrocarbons. Fluorocarbon based aerosols serve as both carrier gas and spray applied adhesive. Spraying and drying of the glue creates gases harmful to the environment. In addition to the undesired gas formation, the adhesive applied by spraying has the following disadvantages: It is so sticky that adhesive residues adhere to the needle channel after a short bonding time and prevent an orderly guiding of the fibers. The adhesion of the embroidered fabric to the adhesive-coated web is often too poor. If the fabric is moved during embroidery preparation, the embroidered pattern will be defective and unusable. In addition, the spray applied adhesive becomes lacquer after a short time and loses its sticky properties.

A disadvantage is also that the adhesive applied by spraying, since it is not accurately dispensable, softens the nonwoven paper, and thus the carrier material becomes unstable in the case of large-area coating.

Therefore, it has hitherto been necessary to work with woven and knitted articles in the embroidery field by coating the web material with sprays of textile adhesive so that it can then be fixed to the embroidered material. By the term fixation is meant the stabilization of the mesh or fabric of the embroidered material. When spraying larger areas, hand spraying results in irregular coating which a / can lead to peeling of embroidered material and b / because precise dosing of sensitive materials (chiffon, silk, jersey, etc.) can cause staining.

Furthermore, the fleece softens when the spray is heavier, causing instability. In this case, the embroidered material deforms and thus deteriorates.

Furthermore, with too much spraying, the yarns and the needle channel stick together and impure an unclean loop, or the threads become stuck in the needle thread channel, so that when the loop is received by the double gripper there is no concurrence.

Alternatively, a thermorun was used. The thermo-web is a spun or knitted web which is laminated with an adhesive that dissolves by heat.

ermine are used in extreme; The nonwoven fabric is used to remove the fibers, and these webs must also be removed after embroidering in certain parts of the fabric. When used in leotards, the handling of the above fleece is very difficult because:

a / at too high a temperature, the color of the embroidered material comes out and it is difficult to clean the fleece without disturbing the embroidered pattern (another unpleasant feature is residues - adhesive particles - on the embroidered material) fusing machines, continuous fusing machines or ironing machines).

When using ironing devices, there is no even grip, as the surface heating and cooling cannot be controlled linearly. This results in an uncontrolled release of material in another embroidering process. The use of a thermorun for the preparation of larger production pallets is excluded, since the fixed material must only be laid flat and thus the process is very expensive.

It is questionable whether the self-adhesive rune material is more suitable for this use than a spray-bonded web. Pressure-sensitive self-adhesive or adhesive adhesives have long been used in the industry, in crafts and in households in the form of adhesive tapes. Many examples of the production of rubber-based adhesive adhesives and polyacrylic acid esters based on organic solvents and aqueous dispersions are known from the patent specification. DE-OS 3643987, DE-OS 3843421 and EP-0141504 disclose copolymers of esters of acrylic acid, acrylic acid and other monomers. DE-OS 3018131 discloses adhesive adhesives from polyacrylic esters and solvent-based isocyanates. Emulsion adhesives based on polymers of n-butyl acrylates, 2-ethylhexyl acrylates, acrylic acid, acrylonitrile, vinyl acetate, methyl methacrylate and other monomers are described, for example, in EP 0130 080, EP 0193 295, EP

0258753, DE 3147007, DE 3313922, DE: 3531601, DE 3829077, DE 3701757 and DE 3808706.

All of the described adhesives based on polyacrylic acid esters have disadvantages for self-adhesive nonwoven materials for textile embroidery which prevent or at least significantly limit their use. While monitoring their use, it has been ensured that the adhesive adhesives either clog or stick to the needle channels very quickly or stick to the non-woven materials harmfully so that they pass onto it when the textile is removed. Other adhesive adhesives are well adhered to non-woven materials, but leave adhesive residues on fabrics. Many adhesive adhesives migrate partially into fleece materials and textiles. The sewn webs may be contaminated with a low molecular weight portion of the glue during staining when ironing, washing or cleaning the fabric in the embroidery area.

It is an object of the invention to provide pressure-sensitive adhesives. an adhesive for nonwoven fabrics in embroidery that would not exhibit the above-mentioned disadvantages and could be used without problems on the nonwoven material as a glue for embroidered fabrics. Also, at high embroidery speeds, the glue must not clog the needle channels for a long time.

SUMMARY OF THE INVENTION

The problem is solved by a pressure-sensitive adhesive, which is composed of the following components, as well as any conventional additives present:

A) 0 to 90 wt.%, In particular 0 to 86 wt.% Acrylic-vinyl acetate-acrylate ester copolymer to 2-8 carbon atoms in the acrylic ester alcohol component and based on 10-60 wt.% Copolymer, in particular 15 to 55 wt. % of vinyl acetate and 1 to 10 wt.%, in particular 2 to 8 wt. acrylic acid (K value according to Fikentscher in the range from 50 to 110 (measured according to DIN 51562 in tetrahydrofuran)),

B) 10 to 80 wt.%, In particular 10 to 75 wt.%, In particular 10 to 67 wt. and in particular 10 to 60% by weight. of copolymers of acrylic acid-acrylic acid-N-methylolmethacrylamide of 4 to 8 carbon atoms in the alcohol component of acrylic acid ester and based on a copolymer of 1 to 10 wt. %, in particular 2 to 8 wt. % of acrylic acid as well as 1 to 10 wt.%, in particular 2 to 8 wt. self-crosslinking N-methylolmethacrylamide (K-value according to Fikentscher in the range from 70 to 130 (according to DIN 51562 in tetrahydrofuran)),

C) up to 90% by weight, in particular 0 to 85% by weight, of acrylic acid-ethyl acrylate-N-methylolmethacrylic acid ester copolymers having from 4 to 8 carbon atoms in the alcohol component of the acrylic ester and based on copolymer 1 % to 10 wt.%, in particular 2 to 8 wt. % of acrylic acid, as well as 1 to 10 wt. % of self-crosslinking N-methylolmethacrylamide; and 20 to 80, in particular 20 to 60 wt. % and preferably 25 to 55 wt. ethyl acrylate (K-value according to Fikentscher in the range 80 to 130 (measured according to DIN 51562 in tetrahydrofuran)),

D) 0 to 25 wt.%, In particular 0 to 20 wt. of tthalic acid) in the tertiary of an ester of 2 to 12 carbon atoms in the alcohol component, wherein at least one of components A) or C) is present in addition to component B).

The amount in addition to component B) of the at least one component A) or C) present is preferably at least 0.1, more preferably 1.0 and in particular at least 5% by weight. In the presence of component D), it is preferably present in an amount of from 5 to 20 and more preferably from 10 to 20% by weight.

preferably from 5 wt. .

from 5

In the case of component A) to 86, more preferably

In the case of component C) up to 90, more preferably 13 to 86 is up to 90

The adhesive components are prepared by methods known from the patent literature.

Preferably, component A) has a K-value of from 60 to 100, component B) has a K-value of from 80 to 120 and component C) has a K-value of from 90 to 120.

In the copolymers of the components of mixtures A (to C), other monomers, such as e.g. a methacrylic acid ester, methacrylic acid, methacrylonitrile and styrene. The monomers may be present, based on the copolymers, in amounts of from 0.25 to 25, more preferably from 0.5 to 20% by weight. % and in particular 1 to 15 wt. The acrylic ester components in the copolymers are preferably n-butyl acrylate or 2-ethylhexyl acrylate.

The composition according to the invention is preferably in the form of an aqueous dispersion adjusted to a pH of 7 to 8, preferably 7 to 7.5, with ammonia water. It is applied in amounts of from 5 to 50 g / m @ ² , in particular from 10 to 45 g / m @ ² on carrier materials, dried to a self-adhesive film and covered with an adhesive release material.

Aqueous dispersions of copolymers contain conventional anionic emulsifiers known from the literature, such as e.g. described in Methoden der organischen Chemie, Houben-Wey1, vol. 14/1, Macromolecular Stoffe, Georg-Thieme-Verlag, Stuttgart 1972, p. 192 to 208.

In order to achieve uniform layering and good film formation, additives such as thickeners, crosslinkers and antifoams are added to the dispersion in the usual amounts (0.5 to 5.0, in particular 0.1 to 2.0%).

The invention further relates to the use of the pressure-sensitive cold-adhesive adhesives according to the invention for the coating of carrier materials such as fiber webs, webs and long-fiber special papers in the range of 15 to 100 g / m ² , preferably 20 to 40 g / m ² .

A flat, thin and transparent carrier material such as silicone paper or silicone film is coated with an aqueous dispersion. When the dispersion is dried, an application rate of 5 to 50 g / m @ ² and preferably 10 to 45 g / m @ ² of pressure-sensitive adhesive film is formed, which is laminated to carrier materials. Suitable carrier materials are preferably fibrous webs and cellulose-based webs.

Such coated substrates, which are manually peeled, serve as adhesive tapes in embroidery fabrics. Lightweight fabrics, e.g. light cotton, jersey and silk, as well as heavy textiles such as. work clothes of heavy cotton or wool, terry and denim adhere well to coated fleece under low pressure.

The fabrics fixed on the self-adhesive web are embroidered at a rate of about 700 stitches per minute. After 10 minutes embroidering, the needle ear and needle channel remain free of adhesive residue. No sliding of the fabric was observed during the embroidery process. The web is then easily torn off the embroidered motif and is free of adhesive residue.

When the embroidered fabric is sewn onto the fabric, it is customary not to remove the self-adhesive fleece paper from the back of the fabric, but is used as a plastifying liner. Ironing, washing and cleaning experiments have shown that adhesive and non-woven paper do not affect the quality of the fabric.

The newly developed material saves textiles and is easy to handle. No gases or vapors are released when processed. Furthermore, it can only be applied to the embroidered material (cold fixed) with a small pressure, which also saves knitted and woven materials. Since the materials to be treated can be painted, deformation of the base material is avoided. The use in border or single embroidery frames has the advantage that the embroidered material no longer has to be retained, since it will be held by the applied film.

The adhesive adhesive according to the invention does not moisten, so that the mechanics and the dot-driven embroidery machine can be set in such a way that neither the needle nor the adhesive, and thus a significant time between downtimes, is possible.

bonding with different types of yarns is prolonged, adhesion is also improved.

nor does it cause fog or expensive computer electronics. The created adhesive film's gripper is not in contact with the higher power of the machine. Further, the glue does not produce any embroidered motif with the present

For border frames, the 3.20 m x 0.45 m path is connected to the embroidery frame using mechanical clips. The silicone paper is then removed and the embroidered material is pressed together with the adhesive tape. This will cause the embroidery material to stabilize so that it cannot come. to deformation of the mesh. Since the use of heat heating (iron) is also eliminated, the fiber is not more unevenly heated or overheated prior to embroidery, so that the embroidered material is spared. This also applies in individual frames, which are used e.g. for finished parts.

The frame or individual frame is moved by the motor according to the set program (transport).

The needle retains its position and back. Importantly, u makes the embroidery movement there while embroidery machines can set the speed according to the type of stitches, stitch length and storing you. Here, the material of the invention provides a great advantage of linear linear adhesion.

The invention will now be explained in more detail by the following examples.

DETAILED DESCRIPTION OF THE INVENTION

Examples 1 to 5

Table 1 shows the various adhesive adhesive formulations of the invention in the form of aqueous dispersions. The weight percentages of the formulas are based on 100% solids, i.e. the water portion is not included. The dispersions are applied unilaterally to silicone papers (67 g / m @ ² ) to form adhesive films containing about 10 g / m @ ^{2 of} adhesive after drying. coating

glue is laminated to fleece the paper (about 30 g / m ² ) Table 1 1 2 3 4 5 acrylic acid-vinyl acetate-acrylic acid copolymer 24 13 86 25 acrylic acid-acrylic acid-ester copolymer N-methylolmethacrylamide 41 67 10 14 45 Acrylic acid-N-methylolmethacrylamide ester acrylic acid copolymer 35 90 20 phthalic acid ester - 20 - 10

The self-adhesive webs produced by the formulations 1 to 5 are subjected to the Afer-Norm 4001 adhesion measurement (instantaneous measurement), but not on steel, since the webs are often torn or split, but on different fabrics used in processing. The following Table 2 shows the measurement results.

F

Table 2

1 2 3 4 5> adhesion of runic paper compared to cotton N / cm 0.07 0.05 0.08 0.17 0.10 Nylonlycra (synthetics) 0.10 0.07 0.09 0.21 0.12 polyester-wool 1 1 _____ 0.45 0.41 0.43 0.39 0.44 chiffon silk 0.18 0.15 0.16 0.26 0.18 flax _ f _ 0.26 0.38 0.22 0.41 0.39 blended fabric of synthetics and cotton __ 1 t _ 0.18 0.24 0.14 0.37 0.27

Strips of samples with adhesive paper rune adhesive composition 1-5 were stored for 6 weeks ^at 70 C, and then the new hundred adhesivity to a variety of textiles. No loss of adhesion was observed.

Claims (8)

PATENT CLAIMS What is claimed is: 1. A pressure-sensitive adhesive comprising a mixture A) 0 to 90 wt. % of a copolymer of an acrylic acid ester of acrylic acid having 2 to 8 carbon atoms in the alcohol component of an acrylic acid ester and based on a copolymer of 10 to 60 wt. % vinyl acetate and 1 to 10 wt. acrylic acid (, Κ-value according to F. kentscher in the range from 50 to 110) - measured according to DIN 51562 in tetrahydrofuran), B) 10 to 80 wt. of a copolymer of acrylic acid-N-methylol methacrylamidic acid to acrylic acid of 4 to 8 carbon atoms in the alcohol component of the acrylic ester and based on the copolymer of 1 to 10% by weight. % of acrylic acid as well as 1 to 10 wt. of naturally occurring N-methylolmethacrylamide (K-value according to Fikentscher in the region between 70 and 130 - measured according to DIN 51562 in tetrahydrofuran), C) 0 to 90 wt. % copolymer of acrylic acid-ethyl acrylate-N-methylolmethacrylamide-acrylic acid having 4 to 8 carbon atoms in the alcohol component of the acid ester and based on the copolymer of 1 to 10 wt. % of acrylic acid and 1 to 10 wt. % self-crosslinking N-methylolmethacrylamide; and 20 to BO wt. ethyl acrylate (K-value according to Fikentscher in the range from 80 to 130 - measured according to DIN 51562 in tetrahydrofuran), D) 0 to 25 wt. an ester of phthalic acid having 2 to 12 carbon atoms in the alcohol component of the ester, wherein in addition to component B) one of components A) or C) is present. The pressure-sensitive adhesive of claim 1, wherein the acrylic ester ester components in the copolymer comprise n-butyl acrylate or 2-ethylhexyl acrylate. Pressure-sensitive adhesive according to claim 1 or 2, characterized in that other monomers, preferably methacrylic acid ester, methacrylonitrile 1, methacrylic acid, alkrylnitrile 1, hydroxyethyl acrylate and styrene, are polymerized in the copolymer. The pressure-sensitive adhesive according to one of claims 1 to 3, characterized in that the other monomers are polymerized in amounts of from 0.25 to 25% by weight. in a copolymer. b. Pressure sensitive adhesive according to one of dreams of water claims d i sper- 1 to 4, z i e. characterized by that he is alive 6. adhesive - sensitive adhesive pressure according to one of claims 1 to 5 characterized by: that Value pH of aqueous d i sper- z i e is set by ammonia water at about 7 to 8. Use of pressure-sensitive adhesive adhesives according to any one of claims 1 to 6 for the production of single- or double-sided, self-adhesive, flat substrates. Use according to claim 7, characterized in that the flat substrates are fibrous webs. Use according to claim 6 or 7, characterized in that the flat substrates are runic papers or long fiber special papers weighing 15 to 100 g / m ² . Adhesive adhesive tape, characterized in that it comprises an adhesive according to any one of claims 1 to 6.