EP2220522A1 - Bandes optiques auto-adhésives pour la gestion de la lumière pour des claviers - Google Patents

Bandes optiques auto-adhésives pour la gestion de la lumière pour des claviers

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Publication number
EP2220522A1
EP2220522A1 EP08857020A EP08857020A EP2220522A1 EP 2220522 A1 EP2220522 A1 EP 2220522A1 EP 08857020 A EP08857020 A EP 08857020A EP 08857020 A EP08857020 A EP 08857020A EP 2220522 A1 EP2220522 A1 EP 2220522A1
Authority
EP
European Patent Office
Prior art keywords
pressure
sensitive adhesive
light
adhesive tape
layer
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Withdrawn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
EP08857020A
Other languages
German (de)
English (en)
Inventor
Marc Husemann
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 EP2220522A1 publication Critical patent/EP2220522A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • 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
    • 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
    • C09J7/29—Laminated material
    • 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]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0808—Mirrors having a single reflecting layer
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • 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
    • Y10T428/2848—Three or more layers

Definitions

  • the invention relates to single-sided or double-sided pressure-sensitive adhesive tapes with multilayer support structures and with light-reflecting properties with high diffuse light content and absorbing properties for backlighting of keyboards.
  • Pressure sensitive adhesive tapes are widely used processing aids in the age of industrialization. Especially for use in the electronics industry very high demands are placed on pressure-sensitive adhesive tapes. In addition to certain adhesion properties, pressure-sensitive adhesive tapes for certain applications should also fulfill optical properties.
  • keyboards are designed more and more elaborate and lighted for the simplified use at night and their backs.
  • the rear illumination allows the assignment of numbers or letters to each key in the dark. This process is also associated with problems. For reasons of cost, the number of light sources should be limited. In addition, for example, reduced by a variety of light sources, the operating life of the batteries in notebooks, for example.
  • the object of the invention is therefore to provide single and / or double-sided pressure-sensitive adhesive tapes which have a high light absorption, which have a high light reflection, high light diffusion on the light-reflecting side and can serve for backlighting the illumination of keyboards.
  • the object is achieved by pressure-sensitive adhesive tapes, which allow not only a high light absorption but also a high diffuse light component for the backlighting of the keyboard due to certain carrier film properties.
  • the invention accordingly relates to at least one-sided pressure-sensitive adhesive tapes comprising at least one multilayer support material and at least one layer of a pressure-sensitive adhesive, characterized by a light transmission of not more than 0.1%, in particular less than 0.1%, a total light reflection of at least 80% (DIN 5063 part 3) and a scattered light content of 30 to 80%.
  • the invention is in particular realized by single- or double-sided pressure-sensitive adhesive tapes which comprise a multilayer carrier material and one or two identical or different pressure-sensitive adhesive mass layers and which have the aforementioned light parameters.
  • the invention relates in particular to single-sided or double-sided pressure-sensitive adhesive tapes which consist of a multilayer substrate and one or two identical or different PSAs which have a light transmission of less than 0.1% and DIN 5063 part 3 a total light reflection of greater than 80% and a scattered Proportion of light from 30 to 80%.
  • the invention further relates to the use of pressure-sensitive adhesive tapes according to the invention for optimizing the backlighting of keys (operating keys), keyboards or keypads, in particular electronic devices.
  • “optimization” is here in particular an increase in the light output of one or more light sources (in particular LEDs, see the following version) for backlighting the keys, keyboards or keypads, in other words, a gain of in Direction of the keys, keyboards or keypads sent light while maintaining the power of the light sources.
  • the pressure-sensitive adhesive tapes according to the invention can be used as a light guide (also referred to as a light guide or light distributor), in particular by being provided between the keys or the actual keypad and the light diodes.
  • the invention accordingly also relates, in particular, to the bonding in the production of keyboards or keypads, in particular electronic devices.
  • Figure 1 schematically shows the backlighting of such a keyboard and is an example of an application of the pressure-sensitive adhesive tapes according to the invention in a keyboard again.
  • LEDs 1 LEDs (LEDs)
  • LEDs (1) As a light source usually LEDs (LEDs) (1) are used.
  • the LEDs (1) distribute the light ( ⁇ ) via a light guide (light distributor).
  • a pressure-sensitive adhesive tape (4) which on one side (4a) is light-absorbing, in particular black and on the other side (4b) light-reflecting, in particular metallic.
  • the light-reflecting side (4b) is preferably aligned to the side of the LEDs (1), reflects the light and increases the light output.
  • the light-absorbing, in particular black side (4a) has the function of light absorption and is advantageously aligned towards the side of the keys (3).
  • scattered light ( ⁇ s ) is collected here and the precision of the light illumination of the button (3) is increased.
  • the PSAs are used for fixing in the keyboard assembly.
  • the adhesive tape according to the invention advantageously has a light-reflecting side and / or a light-absorbing side.
  • the adhesive tape according to the invention furthermore has, in particular for effecting the reflection of light, a metallically reflecting layer, wherein the metallically reflecting layer alone or supportively can be responsible for the reflection, and / or for effecting the absorption of light a color-carrying layer, ie in particular a colored layer or a colored layer Layer.
  • the light-absorbing layer is in particular a dark, preferably a black layer
  • the metallic-reflecting layers of the pressure-sensitive adhesive tapes according to the invention in particular also in the embodiments of FIGS. 2 to 13 described below (in the sense of the light reflecting layers described above) can be replaced by white layers (for example white colored layers), in particular when the ref letations the white layers for the desired application is sufficient.
  • the pressure-sensitive adhesive tapes described in Figure 1 are described in more detail in the construction in the following figures. They consist of a multilayer substrate each with one or two PSAs, have a light transmission of less than 0.1% and according to DIN 5063 Part 3 a total light reflection of greater than 80% and a scattered light content of 30 to 80%.
  • the pressure-sensitive adhesive tape according to the invention consists of a carrier film layer (a), two metallically reflecting layers (b), a color-carrying layer (c) and a PSA layer (d) on the light-reflecting side (b).
  • this consists Pressure-sensitive adhesive tape of the invention comprising a carrier film layer (a), two metallically reflecting layers (b), a color-carrying layer (c) and a PSA layer (d) on the color-carrying layer (c).
  • the pressure-sensitive adhesive tape according to the invention consists of a carrier film layer (a), two metallically reflecting layers (b), a color-carrying layer (c) and two PSA layers (d) and also (d '), the PSAs ( d) and (d ') can be identical or different composition.
  • the pressure-sensitive adhesive tape according to the invention has the product structure outlined in FIG.
  • the double-sided pressure-sensitive adhesive tape consists of a carrier film (a), a metallically reflecting layer (b), a color-bearing layer (c) and two pressure-sensitive adhesive layers (d) and (d '), wherein the pressure-sensitive adhesives (d) are unjd (d') identical or can differ from each other.
  • the pressure-sensitive adhesive tape according to the invention consists of a carrier film (a), a metallically reflecting layer (b), a color-bearing layer (c) and a pressure-sensitive adhesive layers (d), wherein the pressure-sensitive adhesive (d) adheres to the reflective Side (b) is coated.
  • This embodiment thus represents a single-sided pressure-sensitive adhesive tape.
  • the pressure-sensitive adhesive tape (here also one-sided) consists of a carrier film (a), a metallically reflecting layer (b), a color-carrying layer (c) and a pressure-sensitive adhesive layer (d), the pressure-sensitive adhesive (i.e. ) is coated on the color-bearing layer (c).
  • the pressure-sensitive adhesive tape according to the invention has the product structure shown in FIG. 8; the double-sided pressure-sensitive adhesive tape consists here of a carrier film (a), a metallically reflecting layer (b), a color-carrying layer (c) and two pressure-sensitive adhesive layers (d) and (d '), wherein the pressure-sensitive adhesives may be identical or different from one another.
  • FIG. 9 shows a further advantageous embodiment of a one-sided pressure-sensitive adhesive tape according to the invention; this consists of a carrier film (a), a metallically reflecting layer (b), a color-carrying layer (c) and a pressure-sensitive adhesive layer (d), wherein the pressure-sensitive adhesive (d) is applied to the reflective side (b).
  • a one-sided pressure-sensitive adhesive tape according to the invention shown in FIG. 10, this consists of a carrier film (a), a metallically reflecting layer (b), a color-carrying layer (c) and a pressure-sensitive adhesive layer (d), wherein the pressure-sensitive adhesive (d) the color-carrying layer (c) is applied.
  • Fig. 1 1 shows an advantageous embodiment of a pressure-sensitive adhesive tape according to the invention, this consists of a carrier film (a), two metallically reflecting layers (b), at least two superimposed color-carrying layers (c) and (c 1 ) and two pressure-sensitive adhesive layers (d) and (d 1 ), wherein the PSAs may be identical or different from each other.
  • FIG. 12 shows an advantageous embodiment of a single-sided PSA tape according to the invention comprising a carrier film (a), two metallically reflecting layers (b), at least two color-coated layers (c) and (c ') and a pressure-sensitive adhesive layer (d) Pressure-sensitive adhesive (d) on the reflective side (b) is applied.
  • the one-sided pressure-sensitive adhesive tape according to the invention consists of a carrier film (a), two metallically reflecting layers (b), at least two color-coated layers (c) and (c 1 ) and a pressure-sensitive adhesive layer (d) painted one above the other. , wherein the pressure-sensitive adhesive (d) is applied to the color-carrying layer (c ').
  • the carrier film (a) is preferably between 5 and 250 ⁇ m, more preferably between 8 and 50 ⁇ m, most preferably between 12 and 36 ⁇ m thick.
  • the carrier film (a) is very preferably transparent, semitransparent or slightly translucent, for example by coloring.
  • the film (a) is vapor-coated on one or both sides with metal, for example with aluminum or silver.
  • the layers (b) are metallic shiny or slightly matt and light-reflecting.
  • the layer thickness of the layers (b) is preferably between 5 nm and 200 nm.
  • the layer or layers (c), (c 1 ) are the color-carrying lacquer layers, each of which preferably has a layer thickness between 0.01 and 5 microns.
  • a black layer is used as the color-carrying layer (c 1 ), for example by incorporating black dyes or pigments in the corresponding layer, (c) and (c ') can be of different chemical nature and can have different color-bearing pigments, which have an advantageous effect on the light-absorbing properties.
  • lacquer layers in particular black lacquer layers.
  • the pressure-sensitive adhesive layers (d) and (d ') preferably have a thickness of 5 ⁇ m to 250 ⁇ m, respectively.
  • the individual layers (b), (c), (c '), (d) and (d 1 ) within the single-sided or double-sided pressure-sensitive adhesive tape may differ with respect to the layer thickness, so that, for example, different thickness PSA layers can be applied.
  • all filmic polymer supports can be used as film carriers.
  • polyester films are used, particularly preferably PET films (polyethylene terephthalate).
  • the carrier film (a) should be transparent, so that the corresponding design variants with transparent carrier film in each case represent a very preferred inventive embodiment of the particular inventive adhesive tape.
  • the films may be relaxed or have one or more preferred directions. Preferred directions are achieved by stretching in one or two directions.
  • the roughness profile of the carrier film (a) is crucial. Due to the film roughness, the diffuse component of the light reflection can be controlled after the metallization. For example, very preferably films with a film roughness R a of greater than 0.05 ⁇ m, more preferably greater than 0.10 and very preferably greater than 0.15 ⁇ m are used. The preferred maximum film roughness Ra is 0.35 .mu.m. The film roughnesses are measured according to DIN 4768 and can be quantified by the R a value. With increasing film roughness, the diffuse light component in the light reflection of the metallic side is increased. The roughness R a of the carrier film (a) should not exceed 0.35 ⁇ m, since otherwise the light reflection becomes too low.
  • the film roughness of the carrier film (a) can be controlled by the manufacturing process.
  • antiblocking agents such as silica, chalk or chalk, zeolites
  • the roughness of the film is increased.
  • the films can also be embossed after extrusion.
  • the roughness of the carrier film can be controlled by an embossing roller.
  • the rough side is metallized, which is used as a light-reflecting side in the final application.
  • the film roughness can also be controlled by the extrusion process. At the lip exit of the coating nozzle, roughnesses on the surface of the film can be produced by the lip profile. Also can be influenced by the temperature control in the coating nozzle, the surface roughness. Thus, the roughness can be increased by lowering the nozzle lip temperature.
  • the absolute temperature profile depends on the extruded material (glass transition temperature, rheological profile).
  • the film roughness can be controlled by film additives.
  • nano- and micrometer-scale fillers can be added in order to increase the film roughness.
  • the roughness of the film is evenly distributed in a particularly preferred form.
  • the roughness has a prismatic structure.
  • the films may be etched (eg, trichloroacetic acid or trifluoroacetic acid), pretreated with corona or plasma, or equipped with a primer (eg, saran).
  • the film (a) is advantageously vapor-coated on one or both sides with a metal, such as, for example, aluminum or silver.
  • the film layer (a) is vapor-deposited on both sides with aluminum or silver.
  • the sputtering process must be controlled so that the aluminum or silver is applied very evenly to achieve optimum reflection.
  • a plasma-pretreated film is used and vapor-coated on one or both sides with aluminum in one working step.
  • the reflective layer (b) on the one hand the light is deliberately reflected and, on the other hand, the transmission of the light through the carrier material is reduced.
  • the surface roughness of film (a) remains after metallization, albeit in somewhat reduced form.
  • the layer thickness of the metal layer must be completely opaque, i. the film (a) must be fully metallised.
  • the metallized side is again protected by a clearcoat prior to coating with the PSA.
  • the color layers (c) and (c ') can fulfill various functions.
  • the color layer has the function of perfect absorption of the external light. Therefore, in this case, for the double-sided pressure-sensitive adhesive tape, the transmittance in a wavelength range of 300 to 800 nm must be ⁇ 0.5%, more preferably ⁇ 0.1%, most preferably ⁇ 0.01%. In a preferred variant of the invention, this is achieved with a black lacquer layer.
  • a curing binder matrix preferably thermosetting system, but also radiation-curing system possible
  • black color pigments are mixed into the paint matrix.
  • paint materials for example, polyesters, polyurethanes, Polyacrylates or polymethacrylates are used in conjunction with the paint additives known to the person skilled in the art.
  • soot or graphite particles are mixed into the binder matrix as color-carrying particles.
  • electrical conductivity is additionally achieved by means of this additivation (> 20% by weight) in addition to the complete light absorption, so that the inventive double-sided pressure-sensitive adhesive tapes likewise have antistatic properties.
  • the layer (c) and (c ') may also have the additional function of an adhesion promoter.
  • the layer can also improve the adhesion of the pressure-sensitive adhesive (d) or (d ') to the carrier film (a) or to the metallic layer (b).
  • the color layer (c) can additionally be filled with white color pigments.
  • white color pigments are preferably titanium dioxide pigments.
  • the pressure-sensitive adhesives (d) and (d ') are identical in a preferred variant of the invention on both sides of the pressure-sensitive adhesive tape. However, in a specific variant of the invention it may also be advantageous if the pressure-sensitive adhesives (d) and (d ') differ from one another by layer thickness and / or chemical composition. Thus, for example, different adhesive properties can be set in this way.
  • pressure-sensitive adhesive systems for the inventive double-sided pressure-sensitive adhesive tape acrylate, natural rubber, synthetic rubber, silicone or EVA adhesives are used.
  • the pressure-sensitive adhesive preferably has a high transparency on at least this side.
  • the natural rubber is not ground to a molecular weight (weight average) below about 100,000 daltons, preferably not below 500,000 daltons, and is additized.
  • weight average weight average
  • Natural rubbers or synthetic rubbers or any blends of natural rubbers and / or synthetic rubbers can be used, the natural rubber or the natural rubbers in principle from all available qualities such as Crepe, RSS, ADS, TSR or CV types, depending on the required purity and viscosity level, and the synthetic rubber or synthetic rubbers from the group of random copolymerized styrene-butadiene rubbers (SBR), butadiene rubbers (BR), synthetic polyisoprenes (IR), butyl rubbers (NR), halogenated butyl Rubbers (XIIR), the acrylate rubbers (ACM), the ethylene-vinyl acetate copolymers (EVA) and the polyurethanes and / or their blends can be selected.
  • SBR random copolymerized styrene-butadiene rubbers
  • BR butadiene rubbers
  • IR butyl rubbers
  • NR butyl rubbers
  • XIIR halogenated butyl Rubber
  • thermoplastic elastomers having a weight fraction of from 10 to 50% by weight, based on the total elastomer content.
  • SIS styrene-isoprene-styrene
  • SBS styrene-butadiene-styrene
  • (meth) acrylate PSAs preference is given to using (meth) acrylate PSAs.
  • (Meth) acrylate PSAs which are advantageously obtainable by free-radical polymerization and comprise at least 50% by weight of at least one acrylic monomer from the group of compounds of the following general formula:
  • the monomers are preferably selected such that the resulting polymers are used as pressure-sensitive adhesives at room temperature or higher temperatures in particular such that the resulting polymers have pressure-sensitive adhesive properties according to the Handbook of Pressure Sensitive Adhesive Technology by Donatas Satas (van Nostrand, New York 1989).
  • the comonomer composition is selected such that the PSAs can be used as heat-activable PSAs.
  • the molar masses M w of the polyacrylates used are preferably Mw ⁇ 200,000 g / mol.
  • acrylic or methacrylic monomers which consist of acrylic and methacrylic acid esters having alkyl groups of 4 to 14 carbon atoms, preferably 4 to 9 carbon atoms.
  • Specific examples are methyl acrylate, 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-nonyl acrylate , Lauryl acrylate, stearyl acrylate, behenyl acrylate, and their branched isomers such as isobutyl acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, isooctyl
  • cycloalkyl alcohols consisting of at least 6 C atoms.
  • the cycloalkyl alcohols may also be substituted, for example by C-1-alkyl groups, halogen atoms or cyano groups.
  • Specific examples are cyclohexyl methacrylate, isobornyl acrylate, isobornyl methacrylate and 3,5-dimethyl adamantyl acrylate.
  • Moderate basic monomers are, for example, N, N-dialkyl substituted amides, such as N, N-dimethylacrylamide, N, N-dimethylmethylmethacrylamide, N-tert-butylacrylamide, N-vinylpyrrolidone, N-vinyllactam, dimethylaminoethylmethacrylate, dimethylaminoethylacrylate, diethylaminoethylmethacrylate, diethylaminoethylacrylate, N Methylolmethacrylamide, N- (buthoxymethyl) methacrylamide, N-methylolacrylamide, N- (ethoxymethyl) acrylamide, N-isopropylacrylamide, but this list is not exhaustive.
  • hydroxyethyl acrylate hydroxyethyl methacrylate, hydroxypropyl methacrylate, allyl alcohol, itaconic anhydride, itaconic acid, glyceridyl methacrylate, phenoxyethyl methacrylate, 2-butoxyethyl methacrylate,
  • the monomers used are vinyl esters, vinyl ethers, vinyl halides, vinylidene halides, vinyl compounds having aromatic rings and heterocycles in the ⁇ -position.
  • photoinitiators having a copolymerizable double bond are used in a further procedure.
  • Suitable photoinitiators are Norrish I and II photoinitiators. Examples are, for example, benzoin acrylate and an acrylated benzophenone from UCB (Ebecryl P 36®).
  • all photoinitiators known to those skilled in the art can be copolymerized, which can crosslink the polymer via UV irradiation via a radical mechanism.
  • Fouassier "Photoinitiation, Photopolymerization and Photocuring: Fundamentals and Applications", Hanser-Verlag, Kunststoff 1995.
  • Suitable components are aromatic vinyl compounds, such as, for example, styrene, wherein the aromatic nuclei preferably consist of C 4 - to C 18 -components and may also contain heteroatoms.
  • Particularly preferable examples are 4-vinylpyridine, N-vinylphthalimide, methylstyrene, 3,4-dimethoxystyrene, 4-vinylbenzoic acid, benzylacrylate, benzylmethacrylate, phenylacrylate, phenylmethacrylate. t-butylphenyl acrylate, t-butylphenyl methacrylate, 4-biphenyl acrylate and methacrylate, 2-naphthyl acrylate and methacrylate and mixtures of those monomers, this list being not exhaustive.
  • the PSAs may be mixed with resins.
  • the tackifying resins to be added it is possible to use all of the previously known adhesive resins described in the literature. 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. In general, all compatible with the corresponding polyacrylate (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.
  • plasticizers plasticizers
  • further fillers such as, for example, fibers, carbon black, zinc oxide, chalk, solid or hollow glass spheres, microspheres made from other materials, silicic acid, silicates
  • nucleating agents such as, for example, conjugated polymers
  • electrically conductive materials such as, for example, conjugated polymers
  • doped conjugated polymers metal pigments, metal particles, metal salts, graphite, etc.
  • blowing agents compounding agents and / or anti-aging agents, for example in the form of primary and secondary antioxidants or in the form of light stabilizers.
  • the pressure-sensitive adhesive (d ') applied to the black layer (c) contains light-absorbing particles, such as, for example, black color pigments or carbon black or graphite particles as filler.
  • crosslinkers and promoters can be mixed for crosslinking.
  • Suitable crosslinkers for electron beam crosslinking and UV crosslinking are, for example, difunctional or polyfunctional acrylates, difunctional or polyfunctional isocyanates (also in blocked form) or difunctional or polyfunctional epoxides.
  • thermally activatable crosslinkers such as, for example, Lewis acid, metal chelates or multifunctional isocyanates.
  • UV-absorbing photoinitiators can be added to the PSAs.
  • Useful photoinitiators which are very useful are benzoin ethers such as benzoin methyl ether and benzoin isopropyl ether, substituted acetophenones such as 2,2-diethoxyacetophenone (available as Irgacure 651® from Ciba Geigy®, 2,2-dimethoxy-2-one).
  • phenyl-1-phenylethanone dimethoxyhydroxyacetophenone, substituted ⁇ -ketols such as 2-methoxy-2-hydroxypropiophenone, aromatic sulfonyl chlorides such as 2-naphthylsulfonyl chloride, and photoactive oximes such as 1-phenyl-1,2-propanedione; 2- (Oethoxycarbonyl) oxime.
  • the above-mentioned and other usable photoinitiators and others of the Norrish-I or Norrish-II type may contain the following radicals: benzophenone, acetophenone, benzil, benzoin, hydroxyalkylphenone, phenylcyclohexylketone, anthraquinone, trimethylbenzoylphosphine oxide, methylthiophenylmorpholine ketone -, aminoketone, azobenzoin, thioxanthone, Hexarylbisimidazol-, triazine, or fluorenone, wherein each of these radicals additionally with one or more halogen atoms and / or one or more alkoxy groups and / or one or more amino groups or hydroxy groups may be substituted.
  • the pressure-sensitive adhesive is coated from solution onto the support material.
  • the corona power should be minimized, since otherwise pinholes (optical defects, impurities) are burned into the film.
  • the solvent is removed by way of heat supply, for example in a drying tunnel, and optionally the crosslinking reaction is initiated.
  • the polymers described above can furthermore also be coated as hotmelt systems (ie from the melt).
  • hotmelt systems ie from the melt.
  • a very preferred method is concentration over a single or twin screw extruder.
  • the twin-screw extruder can be operated in the same direction or in opposite directions.
  • the solvent or water is preferably distilled off over several vacuum stages. In addition, depending on the distillation temperature of the solvent is heated counter.
  • the residual solvent contents are preferably ⁇ 1%, more preferably ⁇ 0.5% and very preferably ⁇ 0.2%.
  • the hotmelt is processed from the melt.
  • the PSAs are over Roll coating process coated. Different roll coating methods are described in the Handbook of Pressure Sensitive Adhesive Technology by Donatas Satas (van Nostrand, New York 1989). In a further embodiment is coated via a melt nozzle. In another preferred method is coated by extrusion.
  • the extrusion coating is preferably carried out with an extrusion die.
  • the extrusion dies used can advantageously come from one of the following three categories: T die, fishtail die and ironing nozzle. The individual types differ in the shape of their flow channel.
  • the coating can also give the PSAs orientation.
  • crosslinking is effected with electron and / or UV radiation.
  • UV crosslinking is irradiated by brief ultraviolet radiation in a wavelength range of 200 to 400 nm, depending on the UV photoinitiator used, in particular using high-pressure mercury or - medium pressure lamps at a power of 80 to 240 W / cm.
  • the irradiation intensity is adapted to the respective quantum efficiency of the UV photoinitiator and the degree of crosslinking to be set.
  • Typical irradiation devices which 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 applied waste cans range between 5 to 150 kGy, in particular between 20 and 100 kGy.
  • the subject of the invention is the use of the one- and double-sided Pressure-sensitive adhesive tapes for bonding backlighting units for keyboards.
  • the bonding is shown as an example in Figure 1.
  • the single-sided or double-sided pressure-sensitive adhesive tapes may be covered with one or two release films or release papers.
  • siliconized or fluorinated films or papers such as glassine, HPDE or LDPE coated papers are used, which in turn are provided with a release layer based on silicones or fluorinated polymers or fluorinated silicones.
  • the pressure-sensitive adhesive tapes according to the invention can be used in particular for optimizing the backlighting of the keyboards.
  • the transmission was measured in the wavelength range from 190 to 900 nm using a Uvikon 923 from the company Biotek Kontron.
  • the Absolute Transmission is given as the value at 550 nm in%.
  • the roughness of the film is determined and specified according to DIN 4768.
  • the roughness is given in terms of the R a value in ⁇ m.
  • the reflection test is carried out according to DIN standard 5063 part 3.
  • the measuring instrument used was an Ulbrecht sphere type LMT.
  • the reflectance and the scattered light components are given in%. PoJy m er.1.
  • 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 45 minutes, passing nitrogen gas while stirring, the reactor was heated to 58 0 C and 40 g of 2,2'-azoisobutyronitrile (AIBN) was added. Subsequently, the outer heating bath was heated to 75 0 C and the reaction was carried out constantly at this external temperature. After 1 h reaction time again 40 g of AIBN was added. After 5 h and 10 h each was diluted with 15 kg acetone / isopropanol (95: 5).
  • AIBN 2,2'-azoisobutyronitrile
  • the pressure-sensitive adhesives are coated from solution onto a siliconized release paper (PE-coated release paper from. Loparex), dried for 10 minutes in a drying oven at 100 0 C and then crosslinked with 25 kGy dose at an accelerating voltage of 200 kV.
  • the mass application was in each case 50 g / m 2 .
  • the PET films were coated on both sides with aluminum until a full-surface aluminum layer was applied on both sides.
  • the film was vapor-deposited at a width of 300 mm by the sputtering method.
  • positively charged, ionized argon gas is passed into a high-vacuum chamber.
  • the charged ions then strike a negatively charged Al plate and dissolve aluminum particles at the molecular level, which then deposit on the polyester film passed over the plate.
  • the black paint was made from 4 parts Hardener CVL no. 10 (from Dainippon Ink and Chemieals, Inc.) and 35 parts Daireducer TM V No. 20 (by Dainippon Ink and Chemieals, Inc.) and 100 parts of Panacea TM CVL-SPR805 paint (from Dainippon Ink and Chemieals, Inc.), a vinyl chloride-vinyl acetate based paint.
  • the black color is applied evenly and dried for 48 hours at 45 0 C.
  • the black lacquer coated side is completely and evenly black.
  • the application is about 2 g / m 2 .
  • Foil 2 (black / silver):
  • the white color applied evenly and for 48 hours at 45 0 C. dried.
  • the application is 2 g / m 2 .
  • it is painted again on the same side with the black color. It is dried again at 45 ° C. for 48 hours.
  • the double coated side is completely and evenly black.
  • the application of both colors is 4 g / m 2 .
  • the black color is applied flat and dried for 48 hours at 45 0 C.
  • the black lacquer coated side is completely and evenly black.
  • the application is about 2 g / m 2 .
  • Reference film 1 black / white:
  • SW083 SSC polyester film 23 microns
  • the black color is applied flat and dried at 45 0 C for 48 hours.
  • the black lacquer coated side is completely and evenly black.
  • the application is about 2 g / m 2 .
  • Reference foil 2 black / silver:
  • the film 1 is coated in the laminating with the polymer 1 on one side with 50 g / m2.
  • the film 1 is coated in the lamination process with the polymer 1 on both sides with 50 g / m 2 .
  • the film 2 is coated in the lamination process with the polymer 1 on one side with 50 g / m2.
  • the film 2 is coated in the lamination process with the polymer 1 on both sides with 50 g / m 2 .
  • the film 3 is coated in the lamination process with the polymer 1 on one side with 50 g / m 2 .
  • the film 3 is coated in the lamination process with the polymer 1 on one side with 50 g / m2.
  • the reference film 1 is coated in the lamination process with the polymer 1 on both sides with 50 g / m 2 .
  • the reference film 2 is coated in the lamination process with the polymer 1 on both sides with 50 g / m 2 .
  • Examples 1 to 6 were tested together with Reference Examples 1 and 2 according to Test Method A. The results are shown in Table 1. From the results of Table 1 it can be seen that Examples 1 to 6 and Reference Examples 1 and 2 have a very low transmission of less than 0.1%. The measurements prove that both the composition of the paint and the metallization can achieve a very low light transmission for the adhesive tapes.
  • optical measurements were taken from the metallized side. For this purpose was glued as a reference against glass.
  • Reference Example 1 demonstrates that only a small reflection value can be achieved with a white and smooth film having an R a value of 0.05 ⁇ m.
  • Examples 1, 3, 5, 6 and Reference Example 2 were fixed on the rear side of a back-lit keyboard for the performance testing.
  • the keyboard has buttons in the size 1 x 1 cm and a total size of about 8 cm x 28 cm.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

L'invention concerne une bande auto-adhésive au moins sur une face, comprenant au moins un matériau support multicouche et au moins une couche d'une substance auto-adhésive. Selon l'invention, la transmission de lumière n'est pas supérieure à 0,1%, la réflexion de lumière totale est d'au moins 80% et la part de lumière dispersée est de 30 à 80%. L'invention concerne également l'utilisation de telles bandes auto-adhésives à des fins de collage pour la fabrication de claviers.
EP08857020A 2007-12-04 2008-12-03 Bandes optiques auto-adhésives pour la gestion de la lumière pour des claviers Withdrawn EP2220522A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007058461 2007-12-04
PCT/EP2008/066681 WO2009071569A1 (fr) 2007-12-04 2008-12-03 Bandes optiques auto-adhésives pour la gestion de la lumière pour des claviers

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EP2220522A1 true EP2220522A1 (fr) 2010-08-25

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EP (1) EP2220522A1 (fr)
JP (1) JP2011505483A (fr)
KR (1) KR20100099259A (fr)
CN (1) CN101889223B (fr)
DE (1) DE112008003068A5 (fr)
TW (1) TW200934849A (fr)
WO (1) WO2009071569A1 (fr)

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WO2012138495A1 (fr) 2011-04-04 2012-10-11 3M Innovative Properties Company Empilement optique comprenant un adhésif
WO2013130211A1 (fr) * 2012-02-28 2013-09-06 3M Innovative Properties Company Substrat comprenant des zones à faible brillance et à brillance élevée avec une microstructure physique superposée sur ledit substrat
CN104099030B (zh) * 2013-04-11 2016-02-03 鸿富锦精密工业（深圳）有限公司 胶带
TWI556280B (zh) * 2015-07-03 2016-11-01 致伸科技股份有限公司 發光鍵盤
TWI553683B (zh) * 2015-07-03 2016-10-11 致伸科技股份有限公司 發光鍵盤

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NL8602567A (nl) * 1986-10-13 1988-05-02 Philips Nv Werkwijze voor het vervaardigen van een diffuse reflector.
JP3886121B2 (ja) * 2002-07-29 2007-02-28 日東電工株式会社 粘着テープ
US7414313B2 (en) * 2004-12-22 2008-08-19 Eastman Kodak Company Polymeric conductor donor and transfer method
DE102005027392A1 (de) * 2005-06-13 2006-12-14 Tesa Ag Doppelseitige Haftklebebänder zur Herstellung von LC-Displays mit lichtreflektierenden und absorbierenden Eigenschaften
EP1957596A1 (fr) * 2005-12-02 2008-08-20 Tesa AG Rubans autoadhesifs double face a proprietes de reflexion et d'absorption de la lumiere pour la fabrication d'ecrans a cristaux liquides (lcd)
DE102007019131A1 (de) * 2007-04-20 2008-10-23 Tesa Ag Doppelseitiges Haftklebeband
DE202007007116U1 (de) * 2007-05-16 2007-09-20 Zippy Technology Corp. Beleuchtete Tastatur

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See references of WO2009071569A1 *

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DE112008003068A5 (de) 2010-10-14
TW200934849A (en) 2009-08-16
CN101889223B (zh) 2012-05-09
KR20100099259A (ko) 2010-09-10
CN101889223A (zh) 2010-11-17
WO2009071569A1 (fr) 2009-06-11
US20100263782A1 (en) 2010-10-21
JP2011505483A (ja) 2011-02-24

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