EP1453927A1 - Procede pour la production de produits decoupes adhesifs par contact - Google Patents

Procede pour la production de produits decoupes adhesifs par contact

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Publication number
EP1453927A1
EP1453927A1 EP02781249A EP02781249A EP1453927A1 EP 1453927 A1 EP1453927 A1 EP 1453927A1 EP 02781249 A EP02781249 A EP 02781249A EP 02781249 A EP02781249 A EP 02781249A EP 1453927 A1 EP1453927 A1 EP 1453927A1
Authority
EP
European Patent Office
Prior art keywords
psa
punching
psas
adhesive
carrier material
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.)
Withdrawn
Application number
EP02781249A
Other languages
German (de)
English (en)
Inventor
Marc Husemann
Claus Meyer
Jürgen Sievers
Reinhard Storbeck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tesa SE
Original Assignee
Tesa SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tesa SE filed Critical Tesa SE
Publication of EP1453927A1 publication Critical patent/EP1453927A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • 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
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • 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
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9387—Punching tool

Definitions

  • the invention relates to a method for producing punched products and to punched products obtainable in this way.
  • the punch ring or the matrix grid to be removed around the die cuts can tear when removed.
  • These demolitions today lead to massive production disruptions.
  • the effects described apply to all product structures such as transfer adhesive tapes and to substrates coated on one and both sides, such as foils, nonwovens, papers, scrims or foams.
  • the object of the invention is therefore to improve the production of stamped products by avoiding the disadvantages of the prior art described or at least considerably reducing them.
  • the main claim relates to a process for the production of pressure-sensitive die cuts from carrier material equipped with pressure-sensitive adhesive, in which the pressure-sensitive adhesive used is one which is anisotropic in that it has a preferred direction, and in which the stamping process is carried out continuously.
  • the subclaims relate to preferred further developments of this method. Further claims relate to the die cuts obtainable in this way.
  • Anisotropic PSAs which can be used for the process according to the invention are also referred to below as anisotropically oriented or as oriented PSAs.
  • Anisotropically oriented PSAs tend to move back to their original state after being stretched in a given direction by the "entropy-elastic behavior”.
  • all PSAs which have an orientation are suitable for the inventive process, for example those based on natural and synthetic rubbers such as butyl rubber, neoprene, butadiene-acrylonitrile, styrene-butadiene-styrene and styrene-isoprene-styrene copolymers, and also on Based on linear polyesters and copolyesters, polyurethanes, polysiloxane elastomers, based on acrylate block copolymers, especially those with di- and / or triblocks in which at least one block component is based on polyacrylates, furthermore PSAs based on pure acrylates, very particularly advantageously but anisotropic PSAs based on polyacrylate and / or polymethacrylate.
  • natural and synthetic rubbers such as butyl rubber, neoprene, butadiene-acrylonitrile, styrene-butadiene-styrene
  • Such anisotropically oriented acrylate PSAs surprisingly show, as a layer after punching and / or cutting processes, a provision of the PSA layer on the cutting and punching edge, which is used according to the invention for punching out die shapes that do not flow together again.
  • This property is not known for any of the PSAs hitherto belonging to the prior art (an edge of such a die cut after the punching process can be seen in FIG. 1 shows the provision of the PSA caused by anisotropic orientation).
  • the monomers are preferably chosen such that the resulting polymers can be used as pressure-sensitive adhesives at room temperature or higher temperatures, in particular in such a way that the resulting polymers have pressure-sensitive adhesive properties in accordance with the "Handbook of Pressure Sensitive Adhesive Technology" by Donatas Satas (van Nostrand, New York 1989).
  • the molecular weights M w of the polyacrylates used are preferably M w > 200,000 g / mol.
  • acrylic or methacrylic monomers are used for the inventive method, which consist of acrylic and methacrylic acid esters with alkyl groups of 4 to 14 carbon atoms, preferably comprising 4 to 9 carbon atoms.
  • Specific examples are methacrylate, methyl methacrylate, ethyl acrylate, n-butyl acrylate, n-butyl methacrylate, n-pentyl acrylate, n-hexyl acrylate, n-heptyl acrylate, n-octyl acrylate, n-octyl methacrylate, n-octyl methacrylate, n-octyl methacrylate, n-octyl methacrylate, n-octyl methacrylate, n-octyl methacrylate, n-octyl methacrylate, n-octyl methacrylate, n-oc
  • cycloalkyl alcohols consisting of at least 6 C atoms.
  • the cycloalkyl alcohols can also be substituted, for example by C 1-6 alkyl groups. pen, halogen atoms or cyano groups.
  • Specific examples are cyclohexyl methacrylate, isobomyia acrylate, isobornyl methacrylate and 3,5-dimethyladamantylacrylate.
  • monomers which contain polar groups such as carboxyl radicals, sulfonic and phosphonic acid, hydroxyl radicals, lactam and lactone, N-substituted amide, N-substituted amine, carbamate, epoxy, thiol, alkoxy. Wear cyan residue, ether or similar.
  • Moderate basic monomers are e.g. N, N-dialkyl substituted amides such as e.g. N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, N-tert-butylacrylamide, N-vinylpyrrolidone, N-vinyllactam, dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, diethylaminoethyl methacrylate, diethylaminoethyl acrylate, N-methylol methacrylamide,
  • N-dialkyl substituted amides such as e.g. N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, N-tert-butylacrylamide, N-vinylpyrrolidone, N-vinyllactam, dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, diethylaminoeth
  • vinyl esters, vinyl ethers, vinyl halides, vinylidene halides, vinyl compounds with aromatic cycles and heterocycles in the ⁇ -position are used as monomers.
  • photoinitiators with a copolymerizable double bond are also used.
  • Normal-1 and -Il photoinitiators are suitable as photoinitiators.
  • examples are benzoin acrylate and an acrylated benzophenone from UCB (Ebecryl P 36 ® ).
  • all photoinitiators known to the person skilled in the art can be copolymerized, which can crosslink the polymer via a radical mechanism under UV radiation.
  • An overview of possible settable photoinitiators that can be functionalized with a double bond are given in Fouassier: "Photoinititation, Photopolymerization and Photocuring: Fundamentals and Applications", Hanser-Verlag, Kunststoff 1995.
  • Carroy et al. in “Chemistry and Technology of UV and EB Formulation for Coatings, Inks and Paints ", Oldring (ed.), 1994, SITA, London.
  • Aromatic vinyl compounds such as, for example, styrene, are suitable as components, the aromatic nuclei preferably consisting of C 4 to C 8 building blocks and also being able to contain heteroatoms.
  • Particularly preferred examples are 4-vinylpyridine, N-vinylphthalimide, methylstyrene, 3,4-dimethoxystyrene, 4-vinylbenzoic acid, benzyl acrylate, benzyl methacrylate, phenyl acrylate, phenyl methacrylate, t-butylphenyl acrylate, t-butylphenyl methacrylate, 4-biphenyl acrylate and 2-methacrylate Naphylacrylate and methacrylate as well as mixtures of those monomers, although this list is not exhaustive.
  • oriented block copolymers based on acrylate and / or methacrylate can be used for the inventive method.
  • PSAs based on at least one block copolymer may be mentioned here by way of example, the total weight fractions of the block copolymers making up at least 50% of the PSA, at least one block copolymer being composed at least partly of (meth) acrylic acid derivatives, furthermore at least one block copolymer has at least the unit P (A) -P (B) -P (A) from at least one polymer block P (B) and at least two polymer blocks P (A) and where - P (A) independently of one another homo- or copolymer blocks of monomers A represent, the polymer blocks P (A) each having a softening temperature in the range from + 20 ° C to + 175 ° C,
  • P (B) represents a homo- or copolymer block of monomers B, the polymer block P (B) having a softening temperature in the range from - 130 ° C to + 10 ° C,
  • the polymer blocks P (A) and P (B) are not homogeneously miscible with one another, and
  • the pressure-sensitive adhesive system is oriented in that it has a preferred direction, the refractive index n MD measured in the preferred direction being greater than the refractive index n C D measured in a direction perpendicular to the preferred direction.
  • an oriented PSA is used in the method according to the invention which has a shrinkback behavior, the shrinkback being at least 3% by a determination according to test B (shrinkback measurement in the free film).
  • PSAs are used in which the shrinkback is at least 30%, in a preferred embodiment at least 50%.
  • PSAs which are preferably used are distinguished in that the refractive index ⁇ R measured in the preferred direction is greater than the refractive index n SR measured in a direction perpendicular to the preferred direction.
  • ⁇ n ⁇ R - ⁇ SR , serves as a measure of the orientation of the PSA Value is accessible through the measurements described in Test C.
  • Resins can be added to the polyacrylate PSAs for further development. All of the previously known adhesive resins described in the literature can be used as the tackifying resins to be added. Representative are the pinene, indene and rosin resins, their disproportionated, hydrogenated, polymerized, esterified derivatives and salts, the aliphatic and aromatic hydrocarbon resins, terpene resins and terpene phenolic resins as well as C5, C9 and other hydrocarbon resins. Any combination of these and other resins can be used to adjust the properties of the resulting adhesive as desired.
  • all (soluble) resins compatible with the corresponding polyacrylate can be used, in particular reference is made to all aliphatic, aromatic, alkylaromatic hydrocarbon resins, hydrocarbon resins based on pure monomers, hydrogenated hydrocarbon resins, functional hydrocarbon resins and natural resins.
  • plasticizers plasticizers
  • fillers e.g. fibers, carbon black, zinc oxide, titanium dioxide, chalk, solid or hollow glass spheres, microspheres made of other materials, silica, silicates
  • nucleating agents e.g. in the form of primary and secondary antioxidants or in the form of light stabilizers.
  • crosslinkers and promoters can be added for crosslinking.
  • Suitable crosslinkers for electron beam crosslinking and UV crosslinking are, for example, bi- or multifunctional acrylates, bi- or multifunctional isocyanates (also in blocked form) or bi- or multifunctional epoxies.
  • UV-absorbing photoinitiators can be added to the polyacrylate PSAs for optional crosslinking with UV light.
  • Useful photoinitiators that are very easy to use are benzoin ethers, such as. As benzoin methyl ether and benzoin isopropyl ether, substituted acetophenones, such as. B. 2,2-diethoxyacetophenone (available as Irgacure 651 ® from Ciba Geigy ® ), 2,2-dimethoxy-2-phenyl-1-phenyl-
  • ethanone dimethoxyhydroxyacetophenone, substituted ⁇ -ketols, such as.
  • rish I or Norrish II may contain the following residues: benzophenone, acetophenone,
  • Benzil benzoin, hydroxyalkylphenone, phenylcyclohexylketone, anthraquinone, trimethylbenzoylphosphine oxide, methylthiophenylmorpholine ketone, aminoketone, azobenzoin, thioxanthone, hexarylbisimidazole, triazine, or fluorenone, each of which
  • Residues additionally with one or more halogen atoms and / or one or more
  • the monomers are chosen such that the resulting polymers can be used as pressure-sensitive adhesives at room temperature or higher temperatures, in particular in such a way that the resulting polymers have pressure-sensitive adhesive properties in accordance with the "Handbook of Pressure Sensitive Adhesive Technology" by Donatas Satas (van Nostrand, New York 1989)
  • T G glass transition temperature
  • the monomers are very preferably selected in accordance with what has been said above and the quantitative composition of the monomer mixture is advantageously chosen such that the Fox equation ( G1) (cf. TG Fox, Bull. Am. Phys. Soc. 1 (1956) 123) gives the desired T G value for the polymer.
  • n represents the running number of the monomers used
  • w ⁇ the mass fraction of the respective monomer n (% by weight)
  • T G the respective glass transition temperature of the homopolymer from the respective monomers n in K.
  • radical polymerizations are advantageously carried out to prepare the poly (meth) acrylate PSAs.
  • Initiator systems which additionally contain further radical initiators for the polymerization, in particular thermally decomposing radical-forming azo or peroxo initiators, are preferably used for the radical polymerizations.
  • all of the usual initiators known to those skilled in the art for acrylates are suitable.
  • the production of C-centered radicals is described in Houben Weyl, Methods of Organic Chemistry, Vol. E 19a, pp. 60 - 147. These methods are preferably applied in analogy.
  • radical sources are peroxides, hydroperoxides and azo compounds
  • typical free radical initiators are potassium peroxodisulfate, dibenzoyl peroxide, cumene hydroperoxide, cyclohexanone peroxide, di-t-butyl peroxide, azodiisoic acid butyronitrile, cyclohexyl peroxyl peroxetyl peroxetyl peroxetyl peroxetyl peroxetyl peroxetyl peroxetyl peroxetyl peroxetyl peroxetyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxyl peroxo
  • radical initiator 1 '-azo-bis- (cyclohexanecarbonitrile) Vazo
  • the mean molecular weights M w of the free-radical polymerization which are produced in the radical polymerization are very preferably chosen such that they are in a range from 200,000 to 4,000,000 g / mol; PSAs with average molecular weights M w of 400,000 to 1,400,000 g / mol are produced specifically for further use as hotmelt PSAs with anisotropic behavior.
  • the average molecular weight is determined by size exclusion chromatography (GPC) 0 or matrix-assisted laser desorption / ionization mass spectrometry (MALDI-MS).
  • the polymerization can be carried out in bulk, in the presence of one or more organic solvents, in the presence of water or in mixtures of organic solvents and water.
  • the aim is to use the one used
  • Suitable organic solvents are pure alkanes (e.g. hexane, heptane, octane, isooctane), aromatic hydrocarbons (e.g. benzene, toluene, xylene), esters (e.g. ethyl acetate, propyl, butyl or hexyl acetate), halogenated hydrocarbons (e.g. Chlorobenzene), alkanols (e.g. methanol, ethanol, ethylene glycol, ethylene glycol monomethyl ether) and
  • a water-miscible or hydrophilic cosolvent can be added to the aqueous polymerization reactions in order to ensure that the reaction mixture is in the form of a homogeneous phase during the monomer conversion.
  • Advantageously used cosolvents for the present invention are selected from the following group,
  • ! 5 consisting of aliphatic alcohols, glycols, ethers, glycol ethers, pyrrolidines, N-alkylpyrrolidinones, N-alkylpyrrolidones, polyethylene glycols, polypropylene glycols, amides, carboxylic acids and salts thereof, esters, organosulfides, sulfoxides, sulfones, alcohol derivatives, aminokinone derivatives, hydroxyetherone derivatives the like, as well as derivatives and mixtures thereof.
  • the polymerization time is between 2 and 72 hours.
  • the entry of heat is essential for the thermally decomposing initiators.
  • the polymerization can be initiated for the thermally decomposing initiators by heating to 50 to 160 ° C., depending on the type of initiator.
  • acrylic hotmelt PSAs it may also be advantageous to polymerize the acrylic PSAs in bulk.
  • the prepolymerization technique is particularly suitable here.
  • the polymerization is initiated with UV light, but only leads to a low conversion of approximately 10-30%.
  • This polymer syrup can then be e.g. are sealed in foils (in the simplest case ice cubes) and
  • pellets can then be used as acrylic hot-melt adhesives, with film materials which are compatible with the polyacrylate being particularly preferably used for the melting process.
  • Poly (meth) acrylate PSAs are anionic polymerization.
  • Inert solvents are preferably used as the reaction medium, e.g. aliphatic and cycloaliphatic hydrocarbons, or also aromatic hydrocarbons.
  • the living polymer in this case is generally represented by the structure P L (A) -Me: 0, where Me is a Group I metal, such as lithium, sodium or potassium, and P ⁇ _ (A) a growing polymer block from the monomers A is.
  • the molar mass of the polymer to be produced is controlled by the ratio of initiator concentration to monomer concentration.
  • Suitable polymerization initiators are, for. B. n-propyllithium, n-butyllithium, sec-butyllithium, 2-naphthyllithium, cyclohexyllithium! 5 or octyllithium, this list does not claim to be complete.
  • Initiators based on samarium complexes for the polymerization of acrylates are also known (Macromolecules, 1995, 28, 7886) and can be used here.
  • difunctional initiators such as, for example, > 0.1J, 4,4-tetraphenyl-1,4-dilithiobutane or 1J, 4,4-tetraphenyl-1,4-dilithioisobutane.
  • Coinitiators can also be used. Suitable coinitiators include lithium halides, alkali metal alkoxides or alkyl aluminum compounds.
  • the ligands and coinitiators are selected so that acrylate monomers, such as, for example, n-butyl acrylate and 2-ethylhexyl acrylate, can be polymerized directly and do not have to be generated in the polymer by transesterification with the corresponding alcohol.
  • Controlled radical polymerization methods are also suitable for the production of polyacrylate PSAs with a narrow molecular weight distribution.
  • a control reagent of the general formula is then preferably used for the polymerization:
  • R and R 1 are independently selected or the same - branched and unbranched C - to C 18 alkyl radicals; C 3 - to C ⁇ 8 alkenyl radicals; C 3 to C 18 alkynyl radicals;
  • Control reagents of type (I) preferably consist of the following further restricted compounds:
  • Halogen atoms are preferably F, Cl, Br or I, more preferably Cl and Br. Both linear and branched chains are outstandingly suitable as alkyl, alkenyl and alkynyl radicals in the various substituents.
  • alkyl radicals which contain 1 to 18 carbon atoms are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, 2-pentyl, hexyl, heptyl, octyl, 2-ethylhexyl, t-octyl, Nonyl, decyl, undecyl, tridecyl, tetradecyl, hexadecyl and octadecyl.
  • alkenyl radicals having 3 to 18 carbon atoms are propenyl, 2-butenyl, 3-butenyl, isobutenyl, n-2,4-pentadienyl, 3-methyl-2-butenyl, n-2-octenyl, n-2-dodecenyl and isododecenyl and oleyl.
  • alkynyl having 3 to 18 carbon atoms examples include propynyl, 2-butynyl, 3-butynyl, n-2-octynyl and n-2-octadecynyl.
  • hydroxy-substituted alkyl radicals are hydroxypropyl, hydroxybutyl or hydroxyhexyl.
  • halogen-substituted alkyl radicals are dichlorobutyl, monobromobutyl or trichlorohexyl.
  • a suitable C 2 -C 18 heteroalkyl radical with at least one O atom in the carbon chain is, for example, -CH 2 -CH 2 -O-CH 2 -CH 3 .
  • C 3 -C 12 cycloalkyl radicals are, for example, cyclopropyl, cyclopentyl, cyclohexyl or trimethylcyclohexyl.
  • aryl radicals for example, phenyl, naphthyl, benzyl, 4-tert-butylbenzyl or other substituted phenyl, such as ethyl, toluene, xylene, mesitylene, isopropylbenzene, dichlorobenzene or bromotoluene.
  • R 2 can also be selected independently of R and R 1 from the group listed above for these radicals.
  • RAFT process mostly only up to low conversions are polymerized (WO 98/01478 A1) in order to achieve the narrowest possible molecular weight distributions. Due to the low sales, these polymers cannot be used as pressure-sensitive adhesives and, in particular, not as hot-melt pressure-sensitive adhesives, since the high proportion of residual monomers negatively influences the adhesive properties, the residual monomers contaminate the solvent recyclate in the concentration process and the corresponding self-adhesive tapes would show a very high outgassing behavior , To avoid this disadvantage of low sales, the polymerization is initiated several times in a particularly preferred procedure.
  • Nitroxide-controlled polymerizations can be carried out as a further controlled radical polymerization method.
  • nitroxides of type (Va) or (Vb) are used in a favorable manner:
  • R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 independently of one another denote the following compounds or atoms: i) halides, such as chlorine, bromine or iodine ii) linear, branched, cyclic and heterocyclic hydrocarbons with 1 to
  • TEMPO 2,2,6,6-tetramethyl-1-piperidinyloxyl pyrrolidinyloxyl
  • 4-benzoyloxy-TEMPO 4-methoxy-TEMPO
  • 4-chloro-TEMPO 4-hydroxy-TEMPO
  • 4-oxo-TEMPO 4 -Amino-TEMPO, 2,2,6,6-tetraethyl-1-piperidinyloxyl, 2,2,6-trimethyl-6-ethyl ⁇ 1-pipe-ridinyloxyl
  • N-tert-butyl-1-phenyl-2-methyl propyl nitroxide N-tert-butyl-1- (2-naphthyl) -2-methyl propyl nitroxide
  • No. 4,581,429 A discloses a controlled radical polymerization process which uses an initiator of a compound of the formula R'R "NOY, in which Y is a free radical species which can polymerize unsaturated monomers.
  • R'R "NOY a free radical species which can polymerize unsaturated monomers.
  • the reactions generally have low conversions.
  • WO 98/13392 A1 describes open-chain alkoxyamine compounds which have a symmetrical substitution pattern.
  • EP 735 052 A1 discloses a process for producing thermoplastic elastomers with narrow molar mass distributions.
  • WO 96 / 24620 A1 describes a polymerization process in which very special radical compounds such as, for example, phosphorus-containing nitroxides based on imidazolidine are used
  • WO 98/44008 A1 discloses special nitroxyls based on morpholines, piperazinones and piperazinediones DE 199 49 352 A1 describes heterocyclic A.
  • lkoxyamine as Regulators in controlled radical polymerizations.
  • Corresponding further developments of the alkoxyamines and the corresponding free nitroxides improve the efficiency for the production of polyacrylates (Hawker, contribution to the General Meeting of the American Chemical Society, spring 1997; Husemann, contribution to the IUPAC World Polymer Meeting 1998, Gold Coast).
  • ATRP atom transfer radical polymerization
  • the polyacrylate PSAs preferably monofunctional or difunctional secondary or tertiary halides as initiators and for the abstraction of the (r) haiogenide (s) Cu, Ni, , Fe, Pd, Pt, Ru, Os, Rh, Co, Ir, Ag or Au complexes
  • the different possibilities of the ATRP are also described in the documents US 5,945,491 A, US 5,854,364 A and US 5,789,487 A.
  • the polymers described above are preferably coated as hotmelt systems (ie from the melt). It may therefore be necessary for the manufacturing process to remove the solvent from the PSA.
  • a very preferred method is concentration using a single or twin screw extruder.
  • the twin screw extruder can be operated in the same or opposite directions.
  • the solvent or water is preferably distilled off over several vacuum stages. In addition, depending on the distillation temperature of the solvent, heating is carried out.
  • the residual solvent proportions are preferably ⁇ 1%, more preferably ⁇ 0.5% and very preferably ⁇ 0.2%.
  • the hot melt is processed from the melt.
  • the orientation within the PSA is generated by the coating process.
  • Different coating methods can be used for coating as a hot melt and thus also for orientation.
  • the polyacrylate PSAs are coated using a roll coating process and the orientation is produced by stretching. Different roller coating processes are described in the “Handbook of Pressure Sensit tive Adhesive Technology "by Donatas Satas (van Nostrand, New York 1989).
  • the orientation is achieved by coating via a melting nozzle.
  • the orientation of the PSA can be used here one can be created by the nozzle design within the coating nozzle or again by a stretching process after the nozzle outlet. The orientation can be freely adjusted.
  • the stretching ratio can be controlled, for example, by the width of the nozzle gap. Stretching always occurs when the layer thickness of the pressure-sensitive adhesive film on the In a further preferred method, the orientation is achieved by means of the extrusion coating.
  • the extrusion coating is preferably carried out with an extrusion nozzle.
  • the extrusion nozzles used can advantageously consist of one r come in three categories: T-Nozzle, Fishtail Nozzle and Temple-Nozzle. The individual types differ in the shape of their flow channel.
  • the shape of the extrusion die can also be used to generate an orientation within the hotmelt PSA.
  • orientation can also be achieved after stretching out the nozzle by stretching the PSA film.
  • an ironing nozzle on a carrier, in such a way that a polymer layer is formed on the carrier by a relative movement from nozzle to carrier.
  • the time between coating and crosslinking is advantageously short. In a preferred procedure, crosslinking takes place after less than 60 minutes, in a more preferred procedure after less than 3 minutes, in an extremely preferred procedure in the in-line process after less than 5 seconds.
  • the carrier material equipped with PSA can be a single-sided or double-sided adhesive tape with at least one permanent carrier.
  • coating is carried out directly on a carrier material.
  • the PSA is preferably applied to one or both sides of a carrier material.
  • foils such as BOPP or MOPP, PET, PVC or papers or nonwovens (base: cellulose or polymers) are suitable as the carrier material.
  • foams e.g. PUR, PE, PE / EVA, EPDM, PP, PE, silicone, etc.
  • release papers glassine papers, kraft papers, polyolefinically coated papers
  • release films PET, PP or PE or combinations of these materials
  • strapless PSA tapes can also be punched.
  • the backing material provided with pressure-sensitive adhesive is a temporary backing on which the material to be punched, for example a strap which is in itself strapless, is reversibly placed.
  • Correspondingly coated carrier materials are particularly suitable for this purpose, that is to say, for example, the release papers or films described above.
  • Temporary carriers of this type can also be used additionally for materials containing carriers, in particular for stabilization purposes during the stamping process.
  • the material to be punched can also be advantageously coated with release film or release paper, in particular for separating the individual PSA webs.
  • the substrate should be cooled directly by a roller during the coating.
  • the roller can be cooled by a liquid film / contact film from the outside or from the inside or by a cooling gas.
  • the cooling gas can also be used to cool the PSA emerging from the coating nozzle.
  • the roller is wetted with a contact medium, which is then located between the roller and the carrier material. Preferred embodiments for implementing such a technique are described below.
  • both a melt nozzle and an extrusion nozzle can be used for this process.
  • the roller is cooled to room temperature, in an extremely preferred procedure to temperatures below 10 ° C.
  • the roller should also rotate.
  • the roller is also used to crosslink the oriented PSA.
  • UV crosslinking irradiation is carried out using short-wave ultraviolet radiation in a wavelength range from 200 to 400 nm, depending on the UV photoinitiator used, in particular using high-pressure or medium-pressure mercury lamps at a power of 80 to 240 W / cm ,
  • the radiation intensity is the respective Quantum yield of the UV photoinitiator, the degree of crosslinking to be set and the degree of orientation adapted.
  • Typical radiation devices that can be used are linear cathode systems, scanner systems or segment cathode systems if they are electron beam accelerators.
  • the typical acceleration voltages are in the range between 50 kV and 500 kV, preferably 80 kV and 300 kV.
  • the scatter doses used range between 5 to 150 kGy, in particular ⁇ between 20 and 100 kGy.
  • crosslinking methods can also be used or other methods which enable high-energy radiation.
  • the oriented PSAs are coated on a roller provided with a contact medium.
  • the contact medium can in turn cool the PSA very quickly. It is then advantageous to laminate onto the carrier material later.
  • a material can be used as the contact medium which is capable of making contact between the PSA and the roller surface, in particular a material which fills the voids between the carrier material and the roller surface (for example, unevenness in the roller surface, bubbles).
  • a rotating cooling roller is coated with a contact medium.
  • a liquid is selected as the contact medium, e.g. Water.
  • alkyl alcohols such as ethanol, propanol, butanol, hexanol are suitable as additives, without wishing to restrict the selection of the alcohols by these examples.
  • Long-chain alcohols, polyglycols, ketones, amines, carboxylates, sulfonates and the like are also very advantageous. Many of these compounds lower the surface tension or increase the conductivity. A reduction in the surface tension can also be achieved by adding small amounts of nonionic and / or anionic and / or cationic surfactants to the contact medium. In the simplest case, commercial detergents or soap solutions can be used for this, preferably in a concentration of a few g / l in water as the contact medium.
  • Special surfactants which can also be used at low concentrations, are particularly suitable.
  • examples include sulfonium surfactants (eg ⁇ -di (hydroxyalkyl) sulfonium salt), furthermore, for example, ethoxylated nonylphenylsulfonic acid ammonium salts or block copolymers, in particular diblocks.
  • surfactants in Ullmann's Encyclopedia of Industrial Chemistry, Sixth Edition, 2000 Electronic Release, Wiley-VCH, Weinheim 2000.
  • the aforementioned liquids can also be used as contact media without the addition of water, either individually or in combination with one another.
  • the contact medium for example to increase the shear resistance, reduce the transfer of surfactants or the like to the liner surface and thus improve cleaning options for the end product
  • salts, gels and similar viscosity-increasing additives can advantageously be added to the contact medium and / or the additives used
  • the roller can be macroscopically smooth or have a slightly structured surface. It has proven useful if it has a surface structure, in particular a roughening of the surface. The wetting by the contact medium can thereby be improved.
  • the coating process runs particularly well if the roll can be tempered, preferably in a range from -30 ° C. to 200 ° C., very particularly preferably from 5 ° C. to 25 ° C.
  • the contact medium will preferably be applied to the roller.
  • a second roller which receives the contact medium, can be used for the continuous wetting of the coating roller. However, it is also possible for it to be applied without contact, for example by spraying.
  • an earthed metal roller which absorbs the incident electrons and the resulting X-rays.
  • the roller is usually covered with a protective layer. This is • preferably selected so that it is well wetted by the contact medium. Generally the surface is conductive. However, it can also be cheaper 5 to coat them with one or more layers of insulating or semiconducting material.
  • a second roller advantageously with a wettable or absorbent surface, runs through a bath with the contact medium, is wetted or soaked with the contact medium and by contact with the roller applies or spreads a film of this contact medium.
  • the PSA is coated and crosslinked directly on the roller provided with the contact medium.
  • the methods and systems described for UV crosslinking and ES crosslinking can in turn be used for this.
  • the oriented PSA is then transferred to a backing material.
  • the carrier materials already cited can be used.
  • the degree of orientation within the acrylic PSAs depends on the coating process.
  • the orientation can e.g. can be controlled by the nozzle and coating temperature and by the molecular weight of the polyacrylate PSA. : 5
  • the degree of orientation can be freely adjusted using the nozzle gap width. The thicker the PSA film that is pressed out of the coating nozzle, the more the adhesive can be stretched onto a thinner PSA film on the carrier material. In addition to the freely adjustable nozzle width, this stretching process can also be freely adjusted by the web speed of the decreasing carrier material 10.
  • the orientation of the adhesive can be measured with a polarimeter, with infrared
  • acrylic PSAs in the uncrosslinked state only last a few days
  • measuring the shrinkback in the free film is also suitable for determining the orientation and the anisotropic properties of the PSA.
  • orientation can also be generated after the coating.
  • a stretchable backing material is then preferably used here, the PSA then being stretched as it expands.
  • acrylic PSAs coated conventionally from solution or water can also be used.
  • this stretched PSA is crosslinked again with actinic radiation.
  • the punching process takes place continuously in the inventive method.
  • rotary punching can be used in an excellent manner.
  • the punching process can be a punching or a punching process. Accordingly, the following variants can advantageously be carried out:
  • the carrier material equipped with the pressure-sensitive adhesive can be used in such a way
  • machine direction MD corresponds to the preferred direction VR of the PSA or, in an alternative procedure to this, lies perpendicular to it.
  • the PSA guided by the stamping process and the punching knives are very advantageously aligned with one another in such a way that the die cuts preferably run perpendicular to the preferred direction of the PSA.
  • the coating of the PSA on the backing material and the subsequent stamping process can be carried out in an inline process, that is to say in a combined system and / or in a continuous sequence.
  • the punching processes can advantageously be built into processes so that the inventive method advantageously includes several or all of the following steps.
  • the processing of a double-sided PSA tape is described as an example. 5
  • Rotary punching process cutting through the siliconized auxiliary separating material and the adhesive bond. In the ideal case, the punching knives only penetrate minimally into the siliconized surface of the original separating material of the double-sided test tape.
  • Grating pulling off the grid. The die cuts remain on the original separating material.
  • Grating pulling off the grid. The die cuts remain on the siliconized auxiliary separating material.
  • Examples of the speed at which the carrier material equipped with the PSA runs through the system are 0J m / min to 100 m / min. Current speeds for punching processes in practice are 10 to 30 m / min.
  • FIGS. 2 and 3 show examples of two cross sections for punching systems of this type, FIG. 2 with an integrated laminating station. Here mean:
  • the invention relates to stamped products which can be obtained or were obtained in one of its embodiments by the inventive method.
  • Such diecuts can be used as single- or double-sided adhesive products, for bonding in the household and in industry, especially in the automotive industry, in the electrical and electronics industry, for all assembly purposes such as signs, badges and membrane keyboards, in the medical field (plasters , Wound coverings) and the like can be used, to name just a few examples.
  • the die cuts can generally be used wherever die-cut single-sided adhesive labels and double-sided adhesive films are used today. experiments
  • the average molecular weight M w and the polydispersity PD were determined by gel permeation chromatography. THF with 0J vol .-% trifluoroacetic acid was used as the eluent. The measurement was carried out at 25 ° C. PSS-SDV, 5 ⁇ , 10 3 A, ID 8.0 mm ⁇ 50 mm was used as the guard column. The columns PSS-SDV, 5 ⁇ , 10 3 and 10 5 and 10 6 , each with an ID of 8.0 mm x 300 mm, were used for the separation. The
  • sample concentration was 4 g / l, the flow rate 1.0 ml per minute. It was measured against PMMA standards.
  • Strips of at least 30 mm were parallel to the coating direction of the hot melt
  • the retardation R is set as follows d
  • the birefringence was measured using a test set-up as described in the Encyclopedia of Polymer Science, John Wiley & Sons, Vol. 10, p. 505, 1987 as the circular polariscope.
  • This laser beam polarized in this way is then guided through the oriented acrylic mass. Since acrylics are highly transparent, the laser beam can Pass the mass practically unhindered. If the polymer molecules of the acrylic mass are oriented, this results in a change in the polarizability of the acrylic mass depending on the observation angle (birefringence). This effect causes the electric field vector of the circularly polarized laser beam to rotate around the progressive
  • a 200 L reactor conventional for radical polymerizations was charged with 2400 g of acrylic acid, 64 kg of 2-ethylhexyl acrylate, 6.4 kg of N-isopropylacrylamide and 53.3 kg of acetone / isopropanol (95: 5). After passing through with nitrogen gas for 45 minutes while stirring, the reactor was heated to 58 ° C. and 40 g of 2,2'-azoisobutyronitrile (AIBN) were added. The outer heating bath was then heated to 75 ° C. and the
  • the siliconized PET film was passed over a co-rotating steel roller cooled to 5 ° C. At the point of contact of the PSA film on the PET film, the PSA film was immediately cooled down. The mass application was 50 or 100 g / m 2 .
  • the pressure-sensitive adhesive tape was then crosslinked with either UV rays or electron beams after a web stretch of approximately 5 m. 5
  • networking was carried out using a device from Electron Crosslinking AB, Halmstad, Sweden.
  • the coated PSA tape was passed over a standard cooling roller under the Lenard window of the accelerator. In the irradiation zone, the atmospheric oxygen was displaced by flushing with pure nitrogen. The web speed was 10 0 m / min in each case. It was irradiated with an acceleration voltage of 200 kV.
  • a medium-pressure mercury lamp from Eltosch with an intensity of 160 W / cm 2 was used for the UV radiation.
  • the UV dose was approximately 1.6 J / cm 2 . It was irradiated in an air atmosphere. 5 Test B was carried out to determine the shrinkback and therefore the degree of orientation. ii) Production of the oriented pressure sensitive adhesive tapes for the punching process
  • Corona-treated 12 ⁇ m thick PET film was used. All process parameters (web speed, coating temperature, stretch ratio, polyacrylate PSA, crosslinking dose) were kept constant.
  • the PSA was first coated on the corona-treated PET film, crosslinked and then the PSA side was coated with release paper (120 ⁇ m polyolefinically (PE) paper, siliconized on both sides, 1.4 g / m 2 polydimethylsiloxane, from Loparex or 100 ⁇ m Glassin release paper, siliconized on one side, see Table 2) covered.
  • release paper 120 ⁇ m polyolefinically (PE) paper, siliconized on both sides, 1.4 g / m 2 polydimethylsiloxane, from Loparex or 100 ⁇ m Glassin release paper, siliconized on one side, see Table 2
  • a second step the PSA already crosslinked from i) was laminated onto the other side of the PET film, the PSA being pressed on using a roller and the siliconized PET film then being delaminated.
  • the double-sided PSA tape is rolled up at the end.
  • the second step was omitted in the production of the only one-sided adhesive samples.
  • Fig. 4 shows a sketch of the structure of the corresponding pattern. Here mean:
  • Polymer 1 is concentrated according to i) and according to ii) 2 x 100 g / m 2 is coated on a 12 ⁇ m thick PET film.
  • the coating temperature was 150 ° C. It was with
  • Polymer 1 is concentrated according to i) and according to ii) 2 x 50 g / m 2 to a thickness of 12 ⁇ m
  • PET film coated The coating temperature was 150 ° C. It was 30 kGy
  • Polymer 1 is concentrated according to i) and according to ii) is 100 g / m 2 to a thickness of 12 ⁇ m
  • PET film coated The coating temperature was 150 ° C. It was 30 kGy
  • Polymer 1 in solution is mixed with 0.5% by weight of isopropylthioxanthone (Speedcure ITX, from
  • Polymer 1 in solution with 0.5% by weight of isopropylthioxanthone (Speedcure ITX, from! 5 Rahn) based on the polymer. It is then concentrated according to i) and coated according to ii) with 2 x 50 g / m 2 on a 12 ⁇ m thick PET film. The coating temperature was 150 ° C. It was crosslinked with a UV radiation dose of 2.0 J / cm 2 .
  • Polymer 1 is in solution with 2 wt .-% Genomer 4212 ® (polyurethane diacrylate from.
  • Polymer 1 is mixed in solution with 2 wt .-% Genomer ® 4212 (Polyurethandiacrylat Fa. Rahn) and 30 wt .-% DT 110 (terpene-phenol resin of the Fa. DRT). It is then concentrated according to i) and coated according to ii) 2 x 50 g / m 2 on a 12 ⁇ m thick PET film. The coating temperature was 150 ° C. It was cross-linked with a 70 kGy ES dose.
  • Polymer 1 is mixed in solution with 2 wt .-% Genomer ® 4212 (Polyurethandiacrylat Fa. Rahn) and 30 wt .-% DT 110 (terpene-phenol resin of the Fa. DRT). It is then concentrated according to i) and coated according to ii) 100 g / m 2 on a 12 ⁇ m thick PET film. The coating temperature was 150 ° C. It was cross-linked with a 70 kGy ES dose.
  • Polymer 1 is in solution with 0.5% by weight isopropylthioxanthone (Speedcure ITX, from Rahn), 2.5% by weight Genomer 4212 ® (polyurethane diacrylate from Rahn) and with 30% by weight DT 110 (Terpene-phenolic resin from DRT) mixed. It is then concentrated according to: 0 i) and coated according to ii) with 2 x 50 g / m 2 on a 12 ⁇ m thick PET film. The coating temperature was 150 ° C. It was crosslinked with a UV radiation dose of 3.0 J / cm 2 .
  • Polymer 2 is in solution with 2% by weight of Genomer 4212 ® (polyurethane diacrylate from Rahn), with 30% by weight Novares TK 90 ® (C5-C9 hydrocarbon resin from VFT Rüttgers) and 8% by weight. % Reofos 65 ® (oligophosphate from Great Lakes Chemical) mixed. It is then concentrated according to i) and coated according to ii) with 2 x 100 g / m 2 on a 12 ⁇ m thick PET film. The coating temperature was 120 ° C. It
  • »0 was cross-linked with a 60 kGy ES dose.
  • Polymer 2 is in solution with 2 wt .-% Genomer 4212 ® (polyurethane diacrylate from.
  • Polymer 2 is in solution with 2 wt .-% Genomer 4212 ® (polyurethane diacrylate from.
  • PSM adhesive tape M polymer 1 is coated from the solution according to iii) with 2 ⁇ 100 g / m 2 onto a 12 ⁇ m thick PET film.
  • the drying temperature was a maximum of 100 ° C. It was cross-linked with a 30 kGy ES dose.
  • PSA adhesive tape N polymer 1 is coated from the solution according to iii) with 2 ⁇ 50 g / m 2 onto a 12 ⁇ m thick PET film.
  • the drying temperature was a maximum of 100 ° C. It was cross-linked with a 30 kGy ES dose.
  • Pressure-sensitive adhesive tape O polymer 1 is coated from solution according to iii) with 100 g / m 2 onto a 12 ⁇ m thick PET film.
  • the drying temperature was a maximum of 100 ° C. It was cross-linked with a 30 kGy ES dose.
  • PSA tape P Polymer 1 is mixed in solution with 2 wt .-% Genomer ® 4212 (Polyurethandiacrylat Fa. Rahn) and 30 wt .-% DT 110 (terpene-phenol resin of the Fa. DRT). It is then coated from the solution according to iii) with 2 x 100 g / m 2 onto a 12 ⁇ m thick PET film. The drying temperature was a maximum of 100 ° C. It was crosslinked with a 70 kGy ES dose.
  • Polymer 1 is mixed in solution with 2 wt .-% Genomer ® 4212 (Polyurethandiacrylat Fa. Rahn) and 30 wt .-% DT 110 (terpene-phenol resin of the Fa. DRT). It is then coated from the solution according to iii) with 2 x 50 g / m 2 onto a 12 ⁇ m thick PET film. The drying temperature was a maximum of 100 ° C. It was crosslinked with a 70 kGy ES dose.
  • Polymer 1 is mixed in solution with 2 wt .-% Genomer ® 4212 (Polyurethandiacrylat Fa. Rahn) and 30 wt .-% DT 110 (terpene-phenol resin of the Fa. DRT). It is then coated from solution according to iii) with 100 g / m 2 onto a 12 ⁇ m thick PET film. The drying temperature was a maximum of 100 ° C. It was cross-linked with a 70 kGy ES dose.
  • Polymer 2 is in solution with 2% by weight of Genomer 4212 ® (polyurethane diacrylate from Rahn), with 30% by weight Novares TK 90 ® (C5-C9 hydrocarbon resin from VFT Rüttgers) and 8% by weight Reofos 65 ® (oligophosphate from Great Lake Chemicals) mixed. It is then coated from the solution according to iii) with 2 x 100 g / m 2 onto a 12 ⁇ m thick PET film. The drying temperature was a maximum of 100 ° C. It was cross-linked with a 60 kGy ES dose.
  • Genomer 4212 ® polyurethane diacrylate from Rahn
  • Novares TK 90 ® C5-C9 hydrocarbon resin from VFT Rüttgers
  • Reofos 65 ® oligophosphate from Great Lake Chemicals
  • Pressure-sensitive adhesive tape U Polymer 2 is dissolved in 2% by weight of Genomer 4212 ® (polyurethane diacrylate from Rahn), with 30% by weight Novares TK 90 ® (C5-C9 hydrocarbon resin from VFT Rüttgers) and 8% by weight. % Reofos 65 ® (oligophosphate from Great Lake Chemicals) mixed. It is then coated from the solution according to iii) with 2 x 50 g / m 2 onto a 12 ⁇ m thick PET film. The drying temperature was a maximum of 100 ° C. It was cross-linked with a 60 kGy ES dose.
  • Polymer 2 is in solution with 2 wt .-% Genomer 4212 ® (polyurethane diacrylate from.
  • results in a first step 2 polymers with an average molecular weight Mw of approx. 800,000 g / mol were produced.
  • the PSA tapes A to V were produced with these PSAs.
  • Single-sided and double-sided PSA tapes were examined, using a 12 ⁇ m thick PET film as the carrier material. In order to assess the effect of punchability in different processes, a large number of different PSAs were produced.
  • the PSA tapes A, B, C, D, E and M, N, 0 contain a pure polyacrylate without additives as the PSA.
  • a and B differ only by the bulk order.
  • the pressure sensitive adhesive tapes D and E are identical to A and B and differ only in the addition of UV photoinitiator and the UV crosslinking mechanism.
  • the PSA tapes F, G, H, I and P, R, S contain a polyacrylate / resin mixture. A difunctional acrylate is also added as a crosslinker.
  • the PSA tapes are significantly more adhesive due to the addition of resin.
  • the pressure-sensitive adhesive tapes F and G differ in turn by the amount applied, I again by the UV crosslinking mechanism.
  • the PSA tapes J, K, L and T, U, V are very tacky and tacky PSA tapes.
  • Conventional PSA tapes, such as T, U, V, with such soft and tacky PSAs are generally difficult or impossible to punch.
  • the PSA tapes J, K, L were therefore also equipped with a very soft, tacky and oriented PSA, the polymer being based on polyacrylate 2.
  • the degree of orientation of the individual PSAs was determined in a first investigation.
  • the resetting behavior of the oriented PSAs is essential for the stamping process, as this prevents the stamped products from converging. Therefore, in the following the shrinkback was carried out according to method i) in combination with test B. determined in free film for PSA tapes A to V. The measured values are summarized in Table 1.
  • Table 2 gives an overview of the properties of the materials used as an example for the punching.
  • FIG. 2 shows the
  • the roll width of the adhesive materials used was 130 mm.
  • the laminated separating materials had a roll width of 145 mm.
  • the punching tests with double-sided adhesive tapes were carried out in such a way that punching was carried out on the original separating material ("kiss cut" method).
  • a second siliconized auxiliary release material was laminated from above onto the open, adhesive side of the test adhesive tape. Glassine release paper that was siliconized on one side was used as auxiliary release material.
  • the grid was withdrawn at an angle of approximately 80 °.
  • the punching speed was 18 m / min.
  • the punching tests with single-sided adhesive tapes were carried out in such a way that punching was carried out on a siliconized auxiliary release material (“kiss cut” method).
  • the test adhesive tape was laminated on before the punching process.
  • a one-sided siliconized glassine release paper was used as auxiliary separating material (thickness 100 ⁇ m, company Laufenberg, Krefeld, Germany).
  • the grid was withdrawn at an angle of approximately 80 °.
  • the punching speed was 18 m / min.
  • Anisotropically oriented PSAs can achieve significant process advantages in all stamping processes.
  • the solvent-based adhesive tapes T, UN can only be punched to a limited extent due to the soft PSA.
  • the corresponding oriented hot melt patterns J, K, L show in
  • Table 4 gives an overview of the overall punching results. An adhesive tape from 3M was also punched as a comparative product. The "Scotch (TM) 9690 Laminating Adhesive" double-sided adhesive tape gave comparably poor punching results. The error rate was comparable to that of the adhesive
  • Table 5 gives an overview of the punching results.
  • the oriented adhesive tapes have only a small number of defects in most test trials compared to the solvent samples. Manual removal of the lead frame must be done in the machine direction. Manual stripping at right angles to the machine direction resulted in bad error rates comparable to those of the solvent samples.
  • Circular die-cuts made of double-sided adhesive material covered with siliconized release material 1 (auxiliary release material) on a siliconized carrier release material 2 (original release material).
  • the circular die-cuts are characterized by a special level of difficulty.
  • the shrinkback effect caused by the molecular stretching only works on the upper and lower edge of the circle.
  • Fig. 8 shows in detail the effect of the anisotropy effect on the circular die cut.
  • VR shows the direction of stretching.
  • Positions 1 of the die-cut show places without a "cold flow", that is, places where the shrinkback acts.
  • Positions 2 show areas in which the PSA has flowed back (strong "biting").
  • Item number 3 refers to transition areas.
  • the punched finished products were then examined in an automatic dispenser for dispensing ability.
  • the tesa "System 5/2" labeling device was used as the dispensing device.
  • Table 7 gives an overview of the results obtained. Anisotropically oriented single or double-sided adhesive tapes showed clear advantages in the donation behavior.
  • a self-adhesive stamped part should be transferred to a folding box made of paper. The die-cut parts were pulled with the carrier material over a sharp 90 ° edge. All stamped parts with anisotropically oriented PSA showed no flow effects in the area of the common contact edge. The stamped parts could be easily detached and separated at the dispensing edge and did not drag any subsequent stamped parts with them.
  • Anisotropically oriented PSAs have a significantly lower tendency to contaminate the die cutters used in comparison to non-oriented PSAs.
  • the reduced flow behavior in the machine direction of the anisotropically oriented PSAs reduces the contact time between the die cutter and PSA.
  • the punch knives get less dirt and have a significantly longer service life. This favorable effect is also reinforced by the restoring force of the anisotropically oriented PSAs. Adhesive residues of pressure sensitive adhesive on the punching knives are detached from the punching knife by the shrinkback during the punching process.
  • Table 2 Overview of the single- and double-sided tapes used in the punching tests.
  • the table shows the product structure and the manufacturing process and the type of crosslinking that was used to produce the adhesive tape.
  • Table 2 Overview of the single- and double-sided tapes used in the punching tests. The table shows the product structure and the manufacturing process and the type of crosslinking that was used to produce the adhesive tape.
  • Table 4 Overview of the test tapes used and the punching results in Example 1.
  • Table 3 gives an overview of the assessment criteria used.
  • Table 7 Overview of the test tapes used and the punching results in Example 4. The assessment criteria are shown in Table 3.

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  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne un procédé pour la production de découpes adhésives par contact à partir d'un matériau support pourvu d'une matière adhésive de contact. Le procédé selon l'invention est caractérisé en ce qu'on utilise comme matière adhésive de contact une matière qui est orientée de façon à posséder une direction préférée et en ce que la procédure de découpage est exécutée en continu.
EP02781249A 2001-11-22 2002-10-14 Procede pour la production de produits decoupes adhesifs par contact Withdrawn EP1453927A1 (fr)

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DE10157152A DE10157152A1 (de) 2001-11-22 2001-11-22 Verfahren zur Herstellung haftklebriger Stanzprodukte
DE10157152 2001-11-22
PCT/EP2002/011462 WO2003044117A1 (fr) 2001-11-22 2002-10-14 Procede pour la production de produits decoupes adhesifs par contact

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CN111070318A (zh) * 2019-12-31 2020-04-28 东莞领益精密制造科技有限公司 一种超小尺寸双面胶裁切方法
CN111070318B (zh) * 2019-12-31 2021-09-28 东莞领益精密制造科技有限公司 一种超小尺寸双面胶裁切方法

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WO2003044117A1 (fr) 2003-05-30
JP2005509723A (ja) 2005-04-14
AU2002349353A1 (en) 2003-06-10
DE10157152A1 (de) 2003-10-16

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