Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/02—Elements
  • C08K3/04—Carbon
• • 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
  • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
  • C09J11/02—Non-macromolecular additives
  • C09J11/04—Non-macromolecular additives inorganic
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
  • C08K3/013—Fillers, pigments or reinforcing additives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
• • 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
  • C09J115/00—Adhesives based on rubber derivatives
• • 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
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/22—Plastics; Metallised plastics
  • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
  • C09J7/255—Polyesters
• • 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
  • C09J7/35—Heat-activated
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0041—Optical brightening agents, organic pigments
• • 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
  • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
  • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
• • 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
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
  • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
  • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
• • 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
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
  • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
• • 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
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
  • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
• • 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
  • C09J2409/00—Presence of diene rubber
• • 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
  • C09J2415/00—Presence of rubber derivatives
• • 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
  • C09J2461/00—Presence of condensation polymers of aldehydes or ketones
• • 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
  • C09J2467/00—Presence of polyester
  • C09J2467/006—Presence of polyester in the substrate
• • 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
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
  • Y10T428/2813—Heat or solvent activated or sealable
  • Y10T428/2817—Heat sealable
  • Y10T428/2826—Synthetic resin or polymer

Definitions

• the invention relates to black-colored heat-activatable adhesive, in particular for use in an adhesive film for bonding metal parts to plastics in portable consumer electronics articles, and adhesive tape structures comprising adhesive films of black heat-activatable adhesives.
• double-sided pressure-sensitive adhesive tapes are usually used.
• the adhesive forces required for this purpose are sufficient for fixing and fastening the metal components on the plastics.
• the metals used are preferably steel, stainless steel and aluminum.
• the plastics used are, for example, PVC, ABS, PC or blends based on these plastics.
• requirements are constantly increasing for portable consumer electronics products. These articles are getting smaller and smaller, so that also the bonding surfaces are getting smaller. These conditions are particularly problematic for metal bonding on plastics. This can be done in a particularly efficient manner by the use of heat-activatable films that can form a particularly high bond strength after activation.
• Heat-activatable adhesives which are also suitable as a matrix for the adhesive film according to the invention, can fundamentally be divided into two categories, namely thermoplastic heat-activatable adhesives and reactive heat-activatable adhesives. a) Thermoplastic heat-activated adhesives
• thermoplastic heat-activable adhesive bonds physically upon cooling with solidification (use of suitable thermoplastic materials as adhesive, which usually results in reversible bonding), optionally additionally chemically (use of suitable thermoplastic-reactive materials as adhesive, from which, as a rule an irreversible bond results), so that the adhesive effect is maintained in the cooled state and has formed there the actual bond strength.
• suitable thermoplastic materials as adhesive, which usually results in reversible bonding
• suitable thermoplastic-reactive materials as adhesive, from which, as a rule an irreversible bond results
• Thermoplastics are understood to mean those compounds as defined in the Römpp (online version, edition 2008, document identifier RD-20-01271). b) Reactive heat-activatable adhesives
• Reactive heat-activatable adhesives are usually not self-adhesive when heat is applied, so that the adhesive effect occurs only after setting. Reactive heat-activatable adhesives are often not thermoplastic, but are realized by an elastomer-reactive resin system (but compare the heat-activatable films by means of thermoplastic-reactive materials, see above).
• the glass transition temperature is not significant.
• Adhesive compositions are basically composed of one or more polymers (the base polymer component, simply referred to as the base polymer), wherein the Adjustment of the properties usually further components are mixed (such as resins (tackifying resins and / or reactive resins), plasticizers and the like) and optionally further, the properties of the adhesive may affectively influencing additives may be added.
• the base polymer component simply referred to as the base polymer
• the Adjustment of the properties usually further components are mixed (such as resins (tackifying resins and / or reactive resins), plasticizers and the like) and optionally further, the properties of the adhesive may affectively influencing additives may be added.
• Reactive heat activated films have high dimensional stability when the elastomeric component has high elasticity. Furthermore, the reactive resins require that a crosslinking reaction can occur, which significantly increases the bond strength. Thus, for this bonding, e.g. use heat-activated films based on nitrile rubbers and phenolic resins, such. commercially available through the product 8475 from tesa.
• a disadvantage of these reactive heat-activatable films is the dependence of the bond strength on the curing conditions. Here particularly high demands are made, since consumer electronic devices are manufactured in huge numbers and thus the individual components are produced in very short cycle times.
• the nitrile rubber Due to its high flow viscosity, the nitrile rubber gives the heat-activatable film high dimensional stability and, as a result of the crosslinking reaction, enables high bond strengths on metals and plastics.
• Thermoplastic heat-activated films have been known for a long time and are based e.g. on polyesters or copolyamides. Commercial examples thereof are available from 3M companies (for example, Products 615, 615S) or tesa (for example, Product tesa® 8462, 8444, 8466, 8468). For use in portable consumer electronics items, these thermoplastic heat-activatable films have disadvantages as compared to the reactive ones. This applies in particular to the "oozing behavior" under application of pressure under temperature, since in the application mainly diecuts are processed, which then change their shape.
• the object of the invention is to provide a heat-activatable adhesive film for fastening metal parts to plastics for portable consumer goods electronic articles, wherein the respective adhesive is opaque black colored and obtained the property profile in direct comparison to the non-colored adhesive remains and the adhesive film products have the same property profiles.
• an adhesive film comprising at least one heat-activatable adhesive to which black pigments have been added.
• Suitable black pigments are, for example, carbon black, organic azo dyes and / or chromium complexes.
• chromium-based black pigments are [1- [(2-hydroxy-4-nitrophenyl) azo] -2-naphthalenolato (2 -)] [1 - [(2-hydroxy-5-nitrophenyl) azo] -2-naphthalenolato ( 2 -)] chromate (1 -), bis [1 - [(2-hydroxy-4-nitrophenyl) azo] -2-naphthalenolato (2 -)] chromate (1 -) and bis [1 - [(2-hydroxy 5-nitrophenyl) azo] -2-naphthalenolato (2-)] chromate (1 -).
• Black pigments are preferably used in amounts such that the proportion of black pigments in the colored heat-activable adhesive is not more than 8% by volume.
• the adhesive properties of the adhesive can be preserved, but it was not expected that these amounts would lead to a complete blackening of the adhesive. This was the case.
• Particularly well balanced heat-activatable adhesives with regard to blackening and adhesive properties are obtained when black pigments in the range of 1.3 to 1.8% by volume are added to the colored adhesive.
• carbon black particles are added as black pigments, they are preferably used in an amount of up to 12% by weight, based on the dyed adhesive (ie mixed with color pigments). For excellent coloration, it is advantageous to use carbon black at least in an amount of 1.2% by weight. Very in the case of using carbon black as the black pigment, it is preferred to use it in an amount such that the resulting colored heat-activatable adhesive has carbon black in a weight fraction of 2.1 to 3.1% by weight. For example, a quantity of 2.4% by weight of carbon black in the colored heat-activable adhesive has proven to be very advantageous.
• Carbon black may, for example, be added to the heat-activatable composition such that it is present as a pigment preparation in a resin matrix that is chemically similar or at least compatible with (soluble in) the heat-activatable adhesive, such that the resin matrix of the pigment preparation of the adhesive matrix of the finally-colored heat-activated adhesive attributable to.
• the amounts to be used are then preferably to be adjusted accordingly so that the amount of carbon black in the adhesive corresponds to the proportions described above.
• Reactive heat-activable adhesives as well as thermoplastic heat-activatable adhesives can be used as heat-activatable adhesives suitable according to the invention. Very preferably, reactive systems are used.
• Reactive heat-activatable adhesives may preferably be those based on a mixture of at least one nitrile rubber S1 and a reactive component, in particular a reactive resin.
• the proportion by weight of the nitrile rubber S1 is preferably between 25 and 70% by weight, particularly preferably between 30 and 60%, of the total composition of the reactive heat-activatable film.
• the nitrile rubbers S1 preferably have an acrylonitrile content of 15 to 45%. Another criterion for the nitrile rubber S1 is the Mooney viscosity. Since high flexibility at low temperatures must be ensured, the Mooney viscosity should preferably be below 100 (Mooney ML 1 +4 at 100 ° C., corresponding to DIN 53523). Commercial examples of such nitrile rubbers are e.g. Nipol TM N917 from Zeon Chemicals.
• Reactive resins are understood in particular to be short- to medium-chain oligomers or polymeric compounds, in particular having average molecular weights in the range of up to 10,000 g / mol.
• the proportion of reactive resins in the heat-activatable adhesive is preferably between 75 and 30% by weight.
• a very preferred group includes epoxy resins.
• the weight-average molecular weight M w of the epoxy resins varies from 100 g / mol up to a maximum of 10,000 g / mol for polymeric epoxy resins.
• the epoxy resins include, for example, the reaction product of bisphenol A and epichlorohydrin, epichlorohydrin, glycidyl ester, the reaction product of epichlorohydrin and p-amino phenol.
• Preferred commercial examples are e.g. Araldite TM 6010, CY-281 TM, ECN TM 1273, ECN TM 1280, MY 720, RD-2 from Ciba Geigy, DER TM 331, THE TM 732, THE TM 736, THE TM 432, THE TM 438, THE TM 485 from Dow Chemical, Epon TM 812, 825, 826, 828, 830, 834, 836, 871, 872,1001, 1004, 1031 etc. from Shell Chemical and HPT TM 1071, HPT TM 1079 also from Shell Chemical.
• Examples of commercial aliphatic epoxy resins are e.g. Vinylcyclohexane dioxides such as ERL-4206, ERL-4221, ERL 4201, ERL-4289 or ERL-0400 from Union Carbide Corp.
• novolak resins e.g. Epi-Rez TM 5132 from Celanese, ESCN-001 from Sumitomo Chemical, CY-281 from Ciba Geigy, DEN TM 431, DEN TM 438, Quatrex 5010 from Dow Chemical, RE 305S from Nippon Kayaku, Epiclon TM N673 from DaiNipon Ink Chemistry or Epicote TM 152 from Shell Chemical.
• phenolic resins are used as reactive resins.
• novolak resins, phenolic resole resins or combinations of novolak resins and phenolic resins are excellently suitable.
• examples of commercially available phenolic resins are YP 50 from Toto Kasei, PKHC from Union Carbide Corp. and BKR 2620 from Showa Union Gosei Corp. deploy.
• reactive resins can be used as reactive resins and terpene phenolic resins, such as NIREZ TM 2019 by Arizona Chemical.
• reactive resins it is also possible to use polyisocyanates such as Coronate TM L from Nippon Polyurethane Ind., Desmodur TM N3300 or Mondur TM 489 from Bayer.
• adhesives (tackifying) resins are also added to the blend; very advantageous to a proportion of up to 30 wt .-%, based on the total mixture of the heat-activatable adhesive.
• tackifying resins to be added all previously known adhesive resins described in the literature can be used without exception. Mention may be made representative of 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 and 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 compatible with the rubbers S1 (soluble) resins 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.
• the presentation of the state of knowledge in the "Handbook of Pressure Sensitive Adhesive Technology" by Donatas Satas (van Nostrand, 1989) is expressly pointed out.
• crosslinkers and accelerators can also be optionally added to the mixture.
• Suitable accelerators are e.g. Imidazoles, commercially available as 2M7, 2E4MN, 2PZ-CN, 2PZ-CNS, P0505, L07N from Shikoku Chem. or Curezol 2MZ from Air Products.
• Further suitable crosslinkers are HMTA (hexamethylenetetramine) additives.
• amines in particular tert. -Amine to accelerate.
• plasticizers can also be used.
• plasticizers based on polyglycol ethers, polyethylene oxides, phosphate esters, aliphatic carboxylic acid esters and benzoic acid esters be used.
• aromatic carboxylic esters relatively high molecular weight diols, sulfonamides and adipic esters.
• further additives are added to the blend, e.g. Polyvinylformal, polyacrylate rubbers, chloroprene rubbers, ethylene-propylene-diene rubbers, methyl-vinyl-silicone rubbers, fluorosilicone rubbers, tetrafluoroethylene-propylene copolymer rubbers, butyl rubbers, styrene-butadiene rubbers.
• Polyvinyl butyrals are available as Butvar TM from Solutia, under Pioloform TM from Wacker and under Mowital TM from Kuraray.
• Polyacrylate Rubbers are available from Nipol AR TM from Zeon.
• Chloroprene rubbers are available under Baypren TM from Bayer.
• Ethylene-propylene-diene rubbers are available under Keltan TM from DSM, under Vistalon TM from Exxon Mobile and under Buna EP TM from Bayer.
• Methyl vinyl silicone rubbers are available from Silastic TM from Dow Corning and Silopren TM from GE Silicones. Fluorosilicone rubbers are available as Silastic TM from GE Silicones.
• Butyl rubbers are available on Esso Butyl TM from Exxon Mobile. Styrene-butadiene rubbers are available under Buna S TM from Bayer, and Europrene TM from Eni Chem, and under Polysar S TM from Bayer.
• Polyvinylformals are available on Formvar TM from Ladd Research.
• thermoplastics polymers preferably having a softening temperature of greater than 85 ° C. and less than 150 ° C.
• Suitable thermoplastics are, for example, polyesters or copolyesters, polyamides or copolyamides, thermoplastic polyurethanes, polyolefins, for example polyethylene (Hostalen®, Hostalen Polyethylen GmbH), polypropylene (Vestolen P®, DSM).
• the list is not exhaustive.
• blends of different thermoplastics can be used, as well as two different thermoplastics (eg double-sided coating or different coating on both sides of a carrier fleece). Adhesive film structures
• the colored heat-activatable adhesives are offered in layers, ie in the form of a heat-activatable adhesive film.
• Adhesive films of this kind can be present in one layer (so-called transfer adhesive films) or have a carrier, so that a carrier-containing single- or double-sided adhesive films result.
• single-layer or three-layer heat-activatable adhesive films are used, so that the total thickness of the adhesive film is in the range of 25 to 750 ⁇ m, particularly preferably in the range of 30, depending on the surface roughness, curvature or size of the substrates on which the bond is intended is up to 250 ⁇ .
• Such adhesive films can be projected for example for the bonding of metal parts on plastics, of metals on metals and of plastics on plastics.
• the plastics should preferably be chosen such that they withstand the heat, which is necessary for activating the heat-activated bondable adhesive film, unscathed.
• the adhesive tape according to the invention consists of a carrier film layer, preferably of PET, and in each case a black-colored heat-activatable adhesive layer on both sides of the carrier film.
• the adhesive tape can have a very advantageous symmetrical structure (identical adhesive layer thicknesses and / or adhesive compositions and / or adhesive colorations on both sides of the carrier film), but the adhesive layers of the carrier-containing heat-activatable adhesive film according to the invention can also be independent with regard to their adhesive layer thicknesses and / or adhesive composition and / or adhesive composition be chosen from each other.
• the black adhesive layers each preferably have a thickness of 5 ⁇ m to 250 ⁇ m.
• the carrier-containing adhesive films may have a symmetrical structure, but the layer thicknesses of the two adhesive layers may also be combined independently of one another, with one of the abovementioned layer thicknesses being particularly preferred.
• the carrier film is preferably between 5 and 250 ⁇ m, more preferably between 8 and 6 ⁇ m, most preferably between 12 and 36 ⁇ m thick and very particularly preferably 23 ⁇ m thick, 23 ⁇ m thick PET films have the advantage that they have very good adhesive properties for the double-sided Adhesive tape allow, since the film is very flexible and can easily adapt to the surface roughness of the substrates to be bonded.
• Suitable carrier materials are the usual and familiar to those skilled materials such as films (polyester, polyethylene terephthalate (PET), polyethylene (PE) - such as low molecular weight polyethylene (HDPE) or high molecular weight polyethylene (LDPE), polypropylene (PP), biaxially oriented polypropylene (BOPP ), Polyvinyl chloride (PVC), polyimide), nonwovens, foams, fabrics and fabric films as well as release paper (glassine).
• films polyyester, polyethylene terephthalate (PET), polyethylene (PE) - such as low molecular weight polyethylene (HDPE) or high molecular weight polyethylene (LDPE), polypropylene (PP), biaxially oriented polypropylene (BOPP ), Polyvinyl chloride (PVC), polyimide), nonwovens, foams, fabrics and fabric films as well as release paper (glassine).
• films polyyester, polyethylene terephthalate (PET), polyethylene (PE) - such as low mole
• a double-sided heat-activatable adhesive product according to the invention consists of a polyethylene terephthalate carrier film and in each case a black-colored heat-activatable adhesive film, preferably based on a phenol resin / nitrile rubber-based reactive system, on both sides of the carrier film.
• Heat-activatable adhesive films are preferably used, as they are shown above in the context of this document.
• the carrier films may be relaxed or have one or more preferred directions. Preferred directions are achieved by stretching in one or two directions.
• anti-blocking agents such as silica, chalk or chalk, zeolites
• the carrier film itself may be transparent or semitransparent or even have a low transparency, for example by coloring, especially in black. This can be added, for example, by adding color pigments to the film material. For example, carbon blacks are particularly suitable for blackening.
• the pigments or particles should always be smaller in diameter than the final one Layer thickness of the carrier film. Optimal colorations can be achieved with 5 to 40 wt .-% of particles, based on the film material.
• the films may also be etched (e.g., trichloroacetic acid or trifluoroacetic acid), pretreated with corona or plasma, or equipped with a primer (e.g., saran).
• etched e.g., trichloroacetic acid or trifluoroacetic acid
• a primer e.g., saran
• the adhesives are preferably initially dyed black and shaped into the adhesive film (adhesive layer), in particular using temporary carrier materials (release liner).
• the determination of the average molecular weight MW and the polydispersity PD was carried out by means of gel permeation chromatography (GPC).
• the eluent used was THF containing 0.1% by volume of trifluoroacetic acid.
• the measurement was carried out at 25 ° C.
• PSS-SDV, 5 ⁇ , 103 ⁇ (10-7 m), ID 8.0 mm ⁇ 50 mm were used as precolumn.
• the columns PSS-SDV, 5 ⁇ m, 103 ⁇ (10-7 m), 105 ⁇ (10-5 m) and 106 ⁇ (10-4 m), each having an ID of 8.0 mm ⁇ 300 mm, were used.
• the sample concentration was 4 g / l, the flow rate 1, 0 ml per minute. It was measured against PMMA standards. Examples
• Grilltex TM 1442 E from EMS-Grilltech copolyester-based thermoplastic polymer, melting range of the polymer according to the manufacturer's instructions was pressed between two layers of siliconized glassine release paper in a hot press at 140 ° C to 100 ⁇ .
• Grilltex TM 1442 E from EMS-Grilltech was pressed between two layers of siliconized glassine release paper on both sides on a paper nonwoven with a basis weight of 13 g / m 2 in a hot press at 150 ° C.
• the layer thickness of the double-sided adhesive tape was without glassine release paper 150 ⁇ .
• the penetration depth of the adhesive into the web was determined from both sides by SEM images.
• the average layer thickness of the carrier fleece was determined, which was not penetrated by the hot melt adhesive. This value is divided by the starting layer thickness of the carrier web and then expressed as a percentage. In this example, an average degree of saturation of 100% was determined, ie the pattern was 100% soaked in hot melt adhesive.
• Grilltex TM 1442 E from EMS-Grilltech was coextruded with the pigment preparation such that the carbon black content in the adhesive was 2.4% by weight thereafter.
• the dyed adhesive was pressed between two layers of siliconized glassine release paper in a hot press at 140 ° C to 150 ⁇ .
• Grilltex TM 1442 E from EMS-Grilltech was coextruded with the pigment preparation in such a way that the carbon black content in the adhesive was 8% by weight thereafter.
• the dyed adhesive was pressed between two layers of siliconized glassine release paper in a hot press at 140 ° C to 150 ⁇ .
• Grilltex TM 1442 E from EMS-Grilltech was coextruded with the pigment preparation so that the carbon black content in the adhesive was 2.4% by weight thereafter, and the colored adhesive between two layers of siliconized Glassine release paper was coated on both sides at 13 g / m 2 paper nonwoven with a basis weight of 13 g / m 2 pressed in a hot press at 150 ° C.
• the layer thickness of the double-sided adhesive tape was without glassine release paper 150 ⁇ .
• the penetration depth was from both sides determined by SEM images.
• the average layer thickness of the carrier fleece was determined, which was not penetrated by the hot melt adhesive. This value is divided by the starting layer thickness of the carrier web and then expressed as a percentage. In this example, an average degree of saturation of 100% was determined, ie the pattern was 100% soaked in hot melt adhesive.
• Grilltex TM 1442 E from EMS-Grilltech was coextruded with the pigment preparation so that the carbon black content in the adhesive was 8% by weight thereafter, and the colored adhesive between two layers of siliconized glassine release paper was 13 g / m 2 on both sides Paper web with a basis weight of 13 g / m 2 pressed in a hot press at 150 ° C.
• the layer thickness of the double-sided adhesive tape was without glassine release paper 150 ⁇ .
• the penetration depth was determined from both sides by SEM images.
• the average layer thickness of the carrier fleece was determined, which was not penetrated by the hot melt adhesive. This value is divided by the starting layer thickness of the carrier web and then expressed as a percentage. In this example, an average degree of saturation of 100% was determined, ie the pattern was 100% soaked in hot melt adhesive.
• the bond strength of the adhesive sheets prepared as above is determined by means of a dynamic shear test using test samples.
• two substrate platelets are bonded by means of the adhesive film to be examined.
• One of the substrate platelets is a 1, 5 mm thick aluminum plate of size 2 cm x 10 cm; the other substrate plate a 3 mm thick polycarbonate plate also measures 2 cm x 10 cm in dimensions.
• the phenolic / nitrile rubber based adhesive film samples are laminated on the aluminum plate with their free side using a 95 ° C hot plate to activate. Subsequently, the release film is peeled off.
• the bonding of this composite on the polycarbonate plate is carried out in a hot press, being heated over the aluminum side.
• the heat activation is carried out with a 180 ° C hot stamping press at a pressure of 10 bar and 7 s Verpressdauer.
• thermoplastic heat-activatable adhesive are applied to the free side using a 120 ° C hot plate on the Laminated aluminum. Subsequently, the release film is peeled off. The bonding of this composite on the polycarbonate plate is carried out in a hot press, being heated over the aluminum side. The heat activation is carried out with a 150 ° C hot stamping press at a pressure of 6 bar and 7 s Verpressdauer.
• test specimens are torn apart using a 10 mm / min. Tacking machine using the slowly increasing force F.
• the unit measured is expressed in N / mm 2 and is the maximum force (Fmax) measured to separate the test specimens (aluminum and polycarbonate). The measurement is carried out at room temperature - 23 ° C - and 50% relative humidity.
• Measurements are taken immediately after compression and heat activation, with approximately 30 minutes to acclimatize to the respective temperature range.
• the heat-activatable adhesive films 1 to 8 according to the invention were tested analogously to Reference Examples 1-4.
• Reference Example 1-2 represent heat-activatable films based on pigment-free heat-activatable adhesives.
• Reference Examples 3 and 4 illustrate heat-activatable films based on non-pigmented thermoplastic adhesives.
• CCT "Climatic change test”
• heating to + 85 ° C / 85% Rh then cycling through 27 cycles in the range between + 85 ° C / 85% Rh and -40 ° C and then reheated to +85 ° C / 85%, each full cycle (85 ° C - »-40 ° C -» 85 ° C) lasted one hour.

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• Inorganic Chemistry (AREA)
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