EP1894060A1 - Bandes adhesives double face a proprietes de reflexion et d'absorption de la lumiere, pour la fabrication d'afficheurs a cristaux liquides - Google Patents

Bandes adhesives double face a proprietes de reflexion et d'absorption de la lumiere, pour la fabrication d'afficheurs a cristaux liquides

Info

Publication number
EP1894060A1
EP1894060A1 EP05816278A EP05816278A EP1894060A1 EP 1894060 A1 EP1894060 A1 EP 1894060A1 EP 05816278 A EP05816278 A EP 05816278A EP 05816278 A EP05816278 A EP 05816278A EP 1894060 A1 EP1894060 A1 EP 1894060A1
Authority
EP
European Patent Office
Prior art keywords
sensitive adhesive
pressure
layer
adhesive tape
light
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Withdrawn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
EP05816278A
Other languages
German (de)
English (en)
Inventor
Marc Husemann
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 EP1894060A1 publication Critical patent/EP1894060A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • C09J7/20—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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • 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
    • C09J7/50—Adhesives in the form of films or foils characterised by a primer layer between the carrier and the 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • 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
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • C09J2301/162—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer the carrier being a laminate constituted by plastic layers only
    • 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
    • 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
    • C09J2301/41—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the carrier layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements
    • 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
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/266—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension of base or 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
    • 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 double-sided PSA tapes with multilayer carrier structures and with light-reflecting and absorbing properties for the production of liquid crystal displays (LCDs).
  • LCDs liquid crystal displays
  • Pressure sensitive adhesive tapes are widely used processing aids in the age of industrialization. Especially for use in the computer industry very high demands are placed on pressure-sensitive adhesive tapes. In addition to a low outgassing behavior, the pressure-sensitive adhesive tapes should be usable over a wide temperature range and fulfill certain optical properties.
  • FIG. 1 shows the concept of a double-sided adhesive tape with a black absorption layer and a reflection layer according to the prior art
  • LEDs light-emitting diodes
  • black double-sided pressure-sensitive adhesive tapes are usually used. The purpose of the black coloring is to ensure that no light penetrates from the inside to the outside and vice versa in the region of the double-sided pressure-sensitive adhesive tape.
  • a concept for the production of black double-sided pressure-sensitive adhesive tapes consists in the coloring of the carrier material.
  • very preferably double-sided pressure-sensitive adhesive tapes with polyester film carriers (PET) are used, since they can be punched very well.
  • PET polyester film carriers
  • the PET supports can be dyed with carbon black or black color pigments to achieve absorption of the light.
  • the disadvantage of this existing concept is the low absorption of the light. In very thin carrier layers, only a relatively small number of carbon black particles or other black pigment particles can be introduced, with the result that complete absorption of the light is not achieved. With the eye and also with more intense light sources (light intensity greater than 600 candela) then the lack of absorption can be determined.
  • Another concept for producing black double-sided pressure-sensitive adhesive tapes relates to the production of a two-layered support material by means of coextrusion.
  • Carrier films are usually produced by extrusion.
  • Coextrusion coextrudes, in addition to the conventional support material, a second black layer which fulfills the function of light absorption.
  • This concept also has several disadvantages. For example, must be used for the extrusion antiblocking agents, which then lead in the product to the so-called pinholes. These pinholes are optical defects (light transmission at these holes) and negatively affect the operation in the LCD.
  • Another problem is the layer thicknesses, since the two layers are first formed individually in the nozzle and thus can be realized in total only relatively thick carrier layers, with the result that the film is relatively thick and inflexible and thus to the surfaces to be bonded only still badly fits.
  • the black layer must also be relatively thick, otherwise no complete absorption can be realized.
  • Another disadvantage is the changed mechanical properties of the carrier material, since the black layer has different mechanical properties to the original carrier material (eg pure PET).
  • Another disadvantage for the two-layer version of the carrier material is the different anchoring of the adhesive on the coextruded carrier material. In this case of the embodiment, there is always a weak spot in the double-sided adhesive tape.
  • a black color coat is coated on the support material. This can be done on one or both sides of the carrier.
  • This concept also has several disadvantages. On the one hand, there are also slight defects (pinholes) which are registered by antiblocking agents during the film extrusion process. These are not acceptable for final use in the LC display. Furthermore, the maximum absorption properties do not meet the requirements, since only relatively thin paint layers can be applied. Here, too, one is limited in the layer thicknesses upwards, since otherwise the mechanical properties of the carrier material would change.
  • the double sided pressure sensitive adhesive tape should be reflective.
  • double-sided pressure-sensitive adhesive tapes which have a white or a metallic layer on one side and a black light-absorbing layer on the other side.
  • the object of the invention is therefore to provide a double-sided pressure-sensitive adhesive tape, which on the one hand is able to absorb light and on the other hand to allow a reflection of light through a gray color page.
  • the invention thus relates to double-sided pressure-sensitive adhesive tapes which consist of a single-layered or multilayered support material and two identical or different pressure-sensitive adhesive compositions.
  • the main claim therefore relates to PSA tape, in particular for the production or bonding of optical liquid crystal data displays (LCDs) comprising a top and a bottom, with at least one layer of a PSA and at least one carrier film having a top and a bottom, wherein the carrier film translucent Features.
  • LCDs optical liquid crystal data displays
  • Translucency is the translucent property (compared to transparency, which describes transparency). Translucent bodies appear cloudy but may appear clear when in contact with a substrate (clarity of contact).
  • the carrier films are referred to in particular as translucent, if they have a transmission, measured by measuring method A, in the range between a minimum of 5% and a maximum of 70%.
  • the subclaims relate to advantageous and / or particularly suitable embodiments of the invention.
  • the pressure-sensitive adhesive tape is configured as a double-sided pressure-sensitive adhesive tape, that is to say is equipped with a pressure-sensitive adhesive layer on both sides.
  • one or both pressure-sensitive adhesive layers are transparent.
  • At least one black layer is provided on one side of the translucent carrier film.
  • the black layer is preferably a primer layer, a further PSA layer or a lacquer layer.
  • a sequence of several identical or different black layers, in particular the aforementioned embodiments, can be realized.
  • the pressure-sensitive adhesive tape has light-reflecting properties on the upper side and light-absorbing properties on the underside.
  • a first preferred variant of the pressure-sensitive adhesive tape according to the invention consists of a translucent carrier film layer (a) filled with white color pigments, a black primer layer (b) and two pressure-sensitive adhesive layers (c) and (c 1 ), wherein the pressure-sensitive adhesives can be identical or different from one another. This variant is shown in FIG.
  • the inventive pressure-sensitive adhesive tape has the following product structure, sketched in FIG. 3.
  • the double-sided pressure-sensitive adhesive tape consists of a translucent carrier film layer (a) filled with white color pigments, a black-inked pressure-sensitive adhesive layer (d) and two pressure-sensitive adhesive layers. layers (c) and (c 1 ), wherein the PSAs may be identical or different from each other.
  • a pressure-sensitive adhesive tape for a third implementation of a pressure-sensitive adhesive tape according to the invention, this consists of a translucent carrier film layer (a) filled with white color pigments, a black lacquer layer (e) and two pressure-sensitive adhesive layers (c) and (c 1 ), wherein the pressure-sensitive adhesives can be identical or different from one another.
  • the carrier film (a) is preferably between 5 and 250 microns, more preferably between 8 and 50 microns, most preferably between 12 and 36 microns thick, dyed white with different degrees of filling to achieve different shades of gray. Due to the proportion of white pigments, the light transmission can be varied and adjusted to a desired value.
  • the black layer has a layer thickness between 1 ⁇ m and 15 ⁇ m, particularly preferably between 3 ⁇ m and 10 ⁇ m in the case of a primer layer, such as, for example, in variant 1 (FIG 100 microns in the case of a black-inked PSA layer, such as in variant 2 ( Figure 3, layer (d)), and / or between 0.01 and 5 microns in the case of a lacquer layer, such as in the variant 3 ( Figure 4, Layer (s)).
  • a primer layer such as, for example, in variant 1 (FIG 100 microns in the case of a black-inked PSA layer, such as in variant 2 ( Figure 3, layer (d)
  • a lacquer layer such as in the variant 3 ( Figure 4, Layer (s)
  • the pressure-sensitive adhesive layers (c) and (c 1 ) preferably have a thickness of in each case 5 ⁇ m to 250 ⁇ m.
  • the individual layers (b), (c), (c '), (d) and (e) may differ within the double-sided pressure-sensitive adhesive tape with respect to the layer thickness, e.g. different thickness PSA layers are applied.
  • all filmic polymer support can be used, which have a light translucency and are especially colored white.
  • polyethylene, polypropylene, polyimide, polyester, polyamide, polymethacrylate, etc. can be used.
  • polyester films are used, most preferably PET films (polyethylene terephthalate).
  • PET films polyethylene terephthalate
  • the slides can be relaxed or have one or more preferred directions. Preferred directions are achieved by stretching in one or two directions.
  • PET films are particularly advantageous. These films allow very good adhesive properties for the double-sided adhesive tape, since the film is very flexible and can adapt well to the surface roughness of the substrates to be bonded. In addition, when the PET is stained, the translucency is balanced.
  • the films are pretreated.
  • the films may be etched (e.g., trichloroacetic acid or trifluoroacetic acid), pretreated with corona or plasma, or provided with a primer (e.g., saran).
  • the film contains bright, especially white color pigments and / or light, especially white, color-bearing particles.
  • white coloring pigments or particles known to the person skilled in the art are suitable. Examples are e.g. all common titanium dioxide particles or barium sulfate particles for whitening.
  • the pigments or particles should preferably be smaller in diameter than the final layer thickness of the carrier film.
  • the degree of whitening is controlled by the film thickness and the transmission.
  • the light transmission of the white film should preferably be at least 5% and at most at 70% in order to achieve a subsequent gray coloration of the page.
  • the degree of filling with white color particles depends on the chemical composition and the total layer thickness of the film.
  • Optimal colorations can be achieved with 2 to 20 wt .-% of particles based on the film material.
  • the primer layer (b) can perform various functions.
  • the primer layer has the function of substantially completely absorbing the light of the outside light, forming the contrast to produce the gray tone on the opposite side, and improving the anchoring of the adhesive on the substrate. Therefore, in this case, the transmission for the entire double-sided pressure-sensitive adhesive tape is very preferably in a wavelength range of 300-800 nm at ⁇ 0.5%, more preferably ⁇ 0.1%, most preferably ⁇ 0.01%.
  • black primer layer In a preferred procedure, this is achieved with a black primer layer.
  • black color pigments are mixed in.
  • primer materials e.g. Polyesters, polyurethanes, polyacrylates, saran, polyisocyanates, polyaziridines or polymethacrylates are used in conjunction with the paint additives known to the person skilled in the art.
  • carbon black or graphite particles are mixed into the binder matrix as color-carrying particles. In addition to complete absorption of light, this additization additionally achieves electrical conductivity at very high additive content (> 20% by weight), so that the inventive double-sided pressure-sensitive adhesive tapes likewise have antistatic properties.
  • the pressure-sensitive adhesives (c) and (c ') are identical in a preferred embodiment on both sides of the pressure-sensitive adhesive tape. However, in a specific embodiment it may also be advantageous if the pressure-sensitive adhesives (c) and (c 1 ) differ from one another by the layer thickness and / or the 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 preference is given to using acrylate, natural rubber, synthetic rubber, silicone or EVA adhesive. In the event that the double-sided inventive pressure-sensitive adhesive tape must have a reflection on at least one side (gray side), the pressure-sensitive adhesive must preferably have a high degree of transparency on at least this side.
  • the natural rubber is preferably ground to a molecular weight (weight average) not less than about 100,000 daltons, more preferably not less than 500,000 daltons, and additized.
  • Natural rubbers or synthetic rubbers can be used rubbers or any blends of natural rubbers and / or synthetic rubbers, wherein the natural rubber or natural rubbers in principle from all available qualities such as Crepe, RSS, ADS, TSR or CV types, depending on the required level of purity and viscosity, and the synthetic rubber or the synthetic rubbers from the group of the statistically copolymerized styrene-butadiene rubbers (SBR), the butadiene rubbers (BR), the synthetic polyisoprenes (IR), the butyl rubbers (MR), the 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 statistically copolymerized styrene-butadiene rubbers
  • BR butadiene rubbers
  • IR butadiene rubbers
  • MR butyl rubbers
  • thermoplastic elastomers having a weight proportion of 10 to 50% by weight, based on the total elastomer content.
  • SIS styrene-isoprene-styrene
  • SBS styrene-butadiene-styrene
  • (Meth) acrylate PSAs used according to the invention which are obtainable by free-radical polymerization, preferably contain 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 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.
  • the (co) monomer composition is selected such that the PSAs can be used as heat-activable PSAs.
  • the molar masses M w (weight average) of the polyacrylates used are preferably M w > 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, isooct
  • cycloalkyl alcohols consisting of at least 6 C atoms.
  • the cycloalkyl alcohols may also be substituted, e.g. by C 1-6 -alkyl groups, halogen atoms or cyano groups.
  • Specific examples are cyclohexyl methacrylate, isobornyl acrylate, isobornyl methacrylate and 3,5-dimethyl adamantyl acrylate.
  • monomers which contain polar groups such as carboxyl radicals, sulfonic and phosphonic acids, hydroxyl radicals, lactam and lactone, N-substituted amide, N-substituted amine, carbamate, epoxy, thiol, alkoxy. Cyan radicals, ethers or the like wear.
  • Moderate basic monomers are N, N-dialkyl-substituted amides, such as N 1 N-dimethylacrylamide, N, N-Dimethylmethylmethacrylamid, N-tert-butylacrylamide, N-vinyl pyrrolidone, N-vinyllactam, dimethylanninoethylnethacrylate, dimethylanninoethylacrylate, diethylaminoethylmethacrylate, diethylaminoethylacrylate, N-methylolmethacrylamide, N- (butoxymethyl) methacrylannide, N-methylolacrylamide, N- (ethoxymethyl) acrylamide J N-isopropylacrylamide, but this list is not exhaustive.
  • N 1 N-dimethylacrylamide such as N 1 N-dimethylacrylamide, N, N-Dimethylmethylmethacrylamid, N-tert-butylacrylamide, N-vinyl pyrrolidone,
  • the monomers used are vinyl esters, vinyl ethers, vinyl halides, vinylidene halides, vinyl compounds having aromatic rings and heterocycles in the ⁇ -position.
  • photoinitiators with a copolymerizable double bond are used in a further procedure.
  • Suitable photoinitiators are Norrish I and II photoinitiators. Examples include benzoin and an acrylated benzophenone of Fa. UCB (Ebecryl ® P 36).
  • all photoinitiators known to those skilled in the art can be copolymerized, which can crosslink the polymer by UV irradiation via a free-radical mechanism.
  • An overview of possible usable photoinitiators which can be functionalized with a double bond is given in Fouassier: "Photoinitiation, 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.
  • Suitable components include aromatic vinyl compounds such as styrene, in which the aromatic nuclei preferably from C 4 - to C consist ⁇ building blocks and also May contain heteroatoms.
  • Particularly preferable examples are 4-vinylpyridine, N-vinylphthalimide, methylstyrene, 3,4-dimethoxystyrene, 4-vinylbenzoic acid, benzylacrylate, benzylmethacrylate, phenylacrylate, phenylmethacrylate, t-butylphenylacrylate, t-butylphenylmethacrylate, 4-biphenylacrylate and -methacrylate, 2 Naphthyl acrylate and methacrylate and mixtures of those monomers, this list is not exhaustive.
  • the refractive index of the PSA increases and the scattering between the LCD glass and the PSA by e.g. Ambient light is minimized.
  • the PSAs may be mixed with resins.
  • Suitable tackifying resins to be added are 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.
  • plasticizers plasticizers
  • further fillers such as, for example, fibers, carbon black, zinc oxide, chalk, solid or hollow glass spheres, microspheres of other materials, silicic acid, silicates
  • nucleating agents electrically conductive materials, 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
  • protection agents should be added, but then should not affect the reflection on the gray side.
  • the pressure-sensitive adhesive (c ') applied on the black side contains light-absorbing particles, e.g. 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 e.g. Lewis acid, metal chelates or multifunctional isocyanates may be added.
  • UV-absorbing photoinitiators can be added to the PSAs.
  • Useful photoinitiators which are very useful are benzoin ethers, such as benzoin ethers.
  • 2,2-diethoxyacetophenone available as Irgacure 651 ® from. Ciba Geigy ®
  • 2,2-dimethoxy-2-phenyl-1-phenylethanone dimeth- oxyhydroxyacetophenone
  • substituted ⁇ -ketols such as.
  • 2-methoxy-2-hydroxypropiophe- non, aromatic sulfonyl chlorides such as.
  • 2-naphthyl sulfonyl chloride and photoactive oximes, such as.
  • the above-mentioned and other usable photoinitiators and others of the type Norrish-I or Norrish-II 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 substituted can.
  • the PSA layer (d) can advantageously fulfill various functions according to the invention.
  • layer (d) has the function of substantially completely absorbing the outside light and forming the contrast to produce the gray tone on the opposite side. Therefore, it is advantageous if - especially in the aforementioned case - the transmission of the double-sided pressure-sensitive adhesive tape in a wavelength range of 300 - 800 nm at ⁇ 0.5%, more preferably at ⁇ 0.1%, most preferably at ⁇ 0.01% lies. In the context of this invention, this is preferably achieved with a black PSA layer.
  • carbon black or graphite particles are mixed into the pressure-sensitive adhesive matrix as black-carrying particles.
  • electrical conductivity is additionally achieved with a very high additive content (> 20% by weight), so that the inventive double-sided pressure-sensitive adhesive tapes likewise have antistatic properties.
  • the pressure-sensitive adhesive composition (c) contains between 2 and 30% by weight of carbon black, more preferably between 5 and 20% by weight of carbon black and most preferably between 8 and 15% by weight of carbon black.
  • the soot has a light-absorbing function.
  • carbon black powders from Degussa are used. These are commercially available under the trade name Printex TM.
  • Printex TM For better dispersibility into the PSA it is particularly preferred to use oxidatively after-treated blacks.
  • color pigments are added.
  • additives e.g. Blue pigments, e.g. Aniline Black BS890 from Degussa.
  • matting agents can be used as additives.
  • PSA pressure-sensitive adhesive matrix
  • suitable PSA systems are acrylate, natural rubber, synthetic rubber, silicone or EVA compositions.
  • the natural rubber is preferably ground to a molecular weight (weight average) not less than about 100,000 daltons, preferably not less than 500,000 daltons, and additized.
  • 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), the butadiene rubbers (BR), the synthetic polyisoprenes (IR), the butyl rubbers (MR), the 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 synthetic polyisoprenes
  • MR butyl rubbers
  • XIIR halogen
  • thermoplastic elastomers having a weight proportion of 10 to 50% by weight, based on the total elastomer content.
  • SIS styrene-isoprene-styrene
  • SBS styrene-butadiene-styrene
  • (meth) acrylate PSAs are used.
  • (Meth) acrylate PSAs used according to the invention which are obtainable by free-radical polymerization, preferably contain at least 50% by weight of at least one acrylic monomer selected from the group of compounds of the following general formula:
  • R 1 H or CH 3 ;
  • R 2 H or CH 3 or is selected from the group of branched or unbranched, saturated alkyl groups having 1 to 30 carbon atoms.
  • 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 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 pressure-sensitive adhesive matrix from (d) is identical to the PSA (c) or (c 1 ).
  • the use of the same pressure-sensitive adhesive strengthens the viscoelastic profile of the layers (d) and (c) or (c 1 ), which in turn leads to a significant improvement in the adhesive properties (a particular advantage over black lacquer-coated adhesive tapes or black lacquers thick straps equipped adhesive tapes).
  • the monomers are very preferably selected in such a way and the quantitative composition of the monomer mixture is advantageously chosen such that according to the Fox equation (G1) (see TG Fox, Bull. Am. Phys. Soc., 1 (1956) 123) T G value for the polymer.
  • G1 Fox equation
  • n the number of runs via the monomers used
  • W n the mass fraction of the respective monomer n (wt .-%)
  • T G the respective glass transition temperature of the homopolymer of the respective monomers n in K.
  • a further advantage of this invention is that no color-bearing black particles can migrate onto the substrate to be bonded, since the transparent pressure-sensitive adhesive layers lie on the outer sides of the pressure-sensitive adhesive tape. This is a particularly important aspect of the repositionability, since in extreme cases, if incorrectly glued, black residues remain on the LCD film when peeled off accordingly would be, and the entire part would be useless. Within the scope of this invention, this is again achieved in a particularly preferred embodiment in that (d) and (c) or (c 1 ) have the same pressure-sensitive adhesive matrix.
  • a further advantage of the identical pressure-sensitive adhesive matrix is the reduced tendency of the dyes or color-bearing particles to migrate into the adhesive layers (c) or (c 1 ). There is no danger here that the color-bearing particles - for example due to a different polarity - are more soluble in a matrix and migrate there.
  • the two-layer structure also allows additional functions to be implemented.
  • layer (d) it is also possible to add blowing agents which may increase the vibration properties, or further fillers which reduce the production price of the adhesive tape without the adhesive pressure-sensitive adhesive layer (c) or (c 1 ) being affected thereby.
  • the color layer (e) can fulfill various functions.
  • the color layer has the function of substantially completely absorbing the light of the outside light and forming the contrast to produce the gray tone on the opposite side. Therefore, it is advantageous if, especially in this case, the transmission of the entire double-sided pressure-sensitive adhesive tape in a wavelength range of 300-800 nm at ⁇ 0.5%, more preferably at ⁇ 0.1%, most preferably at ⁇ 0.01 % lies. In a preferred embodiment, 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.
  • polyesters, polyurethanes, polyacrylates or polymethacrylates may be used, especially in conjunction with the paint additives known to the person skilled in the art.
  • carbon black or graphite particles are mixed into the binder matrix as color-carrying particles.
  • the monomers are chosen such that the resulting polymers can be used as PSAs 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 In order to obtain a preferred glass transition temperature T G of the polymers of T G ⁇ 25 ° C., the monomers are very preferably selected in accordance with the above and the quantitative composition of the monomer mixture is advantageously chosen such that the following formula is used Fox equation (G1) (see TG Fox, Bull. Am. Phys Soc., 1 (1956) 123) gives the desired T G value for the polymer.
  • G1 Fox equation
  • n the number of runs via the monomers used
  • W n the mass fraction of the respective monomer n (wt .-%)
  • T G n the respective glass transition temperature of the homopolymer of the respective monomers n in K.
  • free radical sources are peroxides, hydroperoxides and azo compounds
  • typical free-radical initiators are potassium peroxodisulfate, dibenzoyl peroxide, cumene hydroperoxide, cyclohexanone peroxide, di-tert-butyl peroxide, Azodiisoklarebutyronitril, Cyclohexylsulfonylacetylperoxid, diisopropyl percarbonate, tert-butyl peroctoate, Benzpinacol
  • the radical initiator used is 1, 1'-azobis (cyclohexanecarboxylic acid nitrile) (Vazo 88 TM from DuPont) or azoisobutyronitrile (AIBN).
  • the average molecular weights M w (weight average) of the PSAs formed in the free-radical polymerization are very preferably selected such that they are in a range from 200,000 to 4,000,000 g / mol; PSAs of average molecular weights M w of from 400,000 to 1,400,000 g / mol are produced especially for further use as electrically conductive hotmelt PSAs with resilience.
  • the determination of the average molecular weight is carried out by size exclusion chromatography (GPC) or matrix-assisted laser desorption / ionization mass spectrometry (MALDI-MS).
  • the polymerization may be carried out neat, in the presence of one or more organic solvents, in the presence of water or in mixtures of organic solvents and water.
  • Suitable organic solvents are pure alkanes (eg hexane, heptane, octane, isooctane), aromatic hydrocarbons (eg benzene, toluene, xylene), esters (eg ethyl acetate, propyl, butyl or hexyl acetate), halogenated hydrocarbons (eg chlorobenzene) , Alkanols (eg, methanol, ethanol, ethylene glycol, ethylene glycol monomethyl ether) and ethers (eg, diethyl ether, dibutyl ether) or mixtures thereof.
  • alkanes eg hexane, heptane, octane, isooctane
  • aromatic hydrocarbons eg
  • aqueous polymerization reactions can be treated with a water-miscible or hydrophilic cosolvent to ensure that the reaction mixture is in the form of a homogeneous phase during the monomer conversion.
  • cosolvents for the present invention are selected from the following group 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, hydroxy ether derivatives, aminoalcohols, ketones and the like, as well as derivatives and mixtures thereof.
  • the polymerization time is - depending on the conversion and temperature - 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.
  • the preparation it may also be advantageous to polymerize the (meth) acrylate PSAs in substance.
  • the recuperymerisationstechnik is suitable here.
  • the polymerization is initiated with UV light, but only led to a low conversion about 10 - 30%.
  • this polymer syrup may e.g. are shrink-wrapped in films (in the simplest case, ice cubes) and then polymerized in water to high conversion.
  • These pellets can then be used as acrylate hotmelt adhesive, with film materials which are compatible with the polyacrilate being particularly preferably used for the melting process.
  • the thermally conductive material additives can be added before or after the polymerization.
  • poly (meth) acrylate PSAs Another advantageous preparation process for the poly (meth) acrylate PSAs is anionic polymerization.
  • inert solvents are preferably used as the reaction medium, e.g. aliphatic and cycloaliphatic hydrocarbons, or aromatic hydrocarbons.
  • the living polymer in this case is generally represented by the structure P L (A) -Me, where Me is a Group I metal such as lithium, sodium or potassium, and P L (A) is a growing polymer of the acrylate monomers ,
  • the molecular weight of the polymer to be produced is controlled by the ratio of initiator concentration to monomer concentration.
  • Suitable polymerization initiators are, for. As n-propyllithium, n-butyllithium, sec-butyllithium, 2-naphthyllithium, cyclohexyllithium or octyllithium, this list is not exhaustive.
  • initiators based on samarium complexes for the polymerization of acrylates are known (Macromolecules, 1995, 28, 7886) and can be used here.
  • difunctional initiators for example 1,1,1,4,4-tetraphenyl-1,4-dilithiobutane or 1,1,1,4,4-tetraphenyl-1,4-dilithioisobutane.
  • Coordinators can also be used.
  • Suitable coinitiators include lithium halides, alkali metal alkoxides or alkylaluminum compounds.
  • the ligands and coinitiators are selected so that acrylate monomers, such as n-butyl acrylate and 2-ethylhexyl acrylate, can be polymerized directly and need not be generated in the polymer by transesterification with the corresponding alcohol.
  • control reagent of the general formula is then preferably used:
  • R and R 1 are independently selected or the same
  • Ci 8 -alkyl radicals C 3 to C 8 alkenyl radicals; C 3 to Cis alkynyl radicals;
  • Cis-alkyl radicals C 3 -C 8 -alkenyl radicals, C 3 -C 8 -alkynyl radicals; C 3 -C 2 -cycloalkyl radicals
  • Control reagents of type (I) preferably consist of the following further restricted compounds:
  • Halogen atoms are in this case preferably F, Cl, Br or I, more preferably Cl and Br.
  • Suitable alkyl, alkenyl and alkynyl radicals in the various substituents are both linear and branched chains.
  • 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, isododecenyl and oleyl.
  • alkynyl radicals having 3 to 18 carbon atoms are 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 8 -Hetero-alkyl radical having at least one O atom in the carbon chain is, for example, -CH 2 -CH 2 -O-CH 2 -CH 3 .
  • C 3 -C 2 cycloalkyl radicals for example, cyclopropyl, cyclopentyl, cyclohexyl or trimethylcyclohexyl serve.
  • the C 6 -C 8 -aryl radicals used are, for example, phenyl, naphthyl, benzyl, 4-tert-butylbenzyl or further substituted phenyl, such as, for example, ethyl, toluene, xylene, mesitylene, isopropylbenzene, dichlorobenzene or bromotoluene.
  • R 2 can also be selected independently of R and R 1 from the above-mentioned group for these radicals.
  • polymerisation is usually carried out only to low conversions (WO 98/01478 A1) in order to realize the narrowest possible molecular weight distributions. Due to the low conversions, however, these polymers can not be used as pressure-sensitive adhesives and in particular not as hotmelt PSAs, since the high proportion of residual monomers adversely affects the adhesive properties, the residual monomers in the concentration process contaminate the solvent recycled and the corresponding self-adhesive tapes show a very high outgassing behavior , In order to avoid this disadvantage of lower conversions, in a particularly preferred procedure the polymerization is initiated several times.
  • nitroxide-controlled polymerizations can be carried out.
  • radical stabilization nitroxides of the type (Va) or (Vb) are used in a favorable procedure:
  • R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 independently of one another are the following compounds or
  • Atoms are: i) halides, e.g. Chlorine, bromine or iodine ii) linear, branched, cyclic and heterocyclic hydrocarbons having 1 to 20
  • TEMPO 2,2,6,6-tetramethyl-i-piperidinyloxy
  • 4-benzoyloxy-TEMPO 4-methoxy-TEMPO
  • 4-chloro-TEMPO 4-hydroxy-TEMPO
  • 4-oxo-TEMPO 4- Amino-TEMPO, 2,2,6,6, -tetraethyl-i-piperidinyloxy, 2,2,6-trimethyl-6-ethyl-1-piperidinyloxy
  • No. 4,581,429 A discloses a controlled-free radical polymerization process which uses as initiator a compound of the formula R'R "N-O-Y, wherein Y is a free radical species which can polymerize unsaturated monomers, but 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 the preparation of thermoplastic elastomers having narrow molecular weight distributions 96/24620 A1 describes a polymerization process in which very specific free-radical compounds, such as, for example, phosphorous-containing nitroxides based on imidazolidine, are used, WO 98/44008 A1 discloses specific nitroxyls which are based on morpholines, piperazinones and piperazinediones 199 49 352 A1 describes heterocyclic Alkoxyamines as regulators in controlled radical polymerizations. Corresponding developments of
  • ATRP polyacrylate PSA atom transfer radical polymerization
  • initiator preferably monofunctional or difunctional secondary or tertiary halides and for the abstraction of the (r) halide (s) Cu, Ni , Fe, Pd, Pt, Ru, Os, Rh, Co, Ir, Ag or Au complexes (EP 0 824 111 A1, EP 826 698 A1, EP 824 110 A1, EP 841 346 A1, EP 850 957 A1).
  • the PSA is coated in a preferred procedure from solution to the substrate.
  • it is optionally possible to pretreat the layers (a) and / or (e).
  • it can be applied from the melt or from solution, a primer or it can be chemically etched.
  • a black lacquer layer but the corona power should be minimized, since otherwise pinholes are burned into the film.
  • heat is applied via e.g. in a drying channel, the solvent is removed and optionally initiated the crosslinking reaction.
  • 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. For coating as a hotmelt different coating methods can be used.
  • the PSAs are coated by a roll coating process.
  • Different roll coating processes are described in the Handbook of Pressure Sensitive Adhesive Technology by Donatas Satas (van Nostrand, New York 1989), in another embodiment, a melt die is coated, in another preferred process, extrusion is coated 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 stirrup die The individual types differ in the shape of their flow channel also get an orientation.
  • the PSA may be crosslinked.
  • In a preferred embodiment is crosslinked with UV and / or electron radiation.
  • UV crosslinking is irradiated by short-wave ultraviolet irradiation in a wavelength range of 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 irradiation intensity is adapted to the respective quantum yield of the UV photoinitiator and the degree of crosslinking to be set.
  • the PSA are crosslinked in an advantageous embodiment with electron beams.
  • Typical irradiation devices which are advantageously 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 invention relates to the use of the inventive double-sided pressure-sensitive adhesive tapes for bonding or production of LC displays.
  • the 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.
  • siliconized PET films are used for covering.
  • the reflection test is carried out according to DIN standard 5036 part 3, DIN 5033 part 3 and DIN 5033 part 4.
  • the measuring instrument used was an integrating sphere type LMT (diameter 50 cm) in combination with a digital indicator TYP LMT Tau-p-Meter.
  • the integral measurements are made with a light source according to standard light A and V (A) - matched Si photoelement. It was measured against a glass reference sample.
  • the reflectance is given as the sum of directed and scattered light fractions in%.
  • a conventional 200 L reactor for free-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 added 40 g of 2,2'-azoisobutyronitrile (AIBN). Subsequently, the outer heating bath was heated to 75 ° C and the reaction was carried out constantly at this external temperature. After 1 h reaction time again 40 g of AIBN was added.
  • AIBN 2,2'-azoisobutyronitrile
  • polymer 1 In a drum, polymer 1 is diluted with petroleum spirit to a solids content of 30%. Subsequently, with vigorous stirring, 8% by weight of carbon black (Printex TM 25, Degussa AG), based on the polymer 1, is mixed in. For homogenization, the solution is homogenized for 10 minutes with a homogenizer (Ultraturrax).
  • a homogenizer Ultraturrax
  • the PSAs 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 at 25 kGy dose at an accelerating voltage of 200 kV.
  • the mass application was in each case 50 g / m 2
  • a polyethylene terephthalate copolymer (Advansa Melinar TM B60) was used at 15% by weight.
  • Titanium dioxide (average diameter 0.25 microns) mixed in a kneader for 2 h at 180 ° C and dried under vacuum. Subsequently, in a single-screw Extruder the film material through a slot die (T-shape, 300 micron slot gap) extruded at 280 ° C. The film is applied to a mirrored chill roll. It is then stretched by tempering to 90 to 95 0 C 3.5 times in the longitudinal direction. Then the film moved into a jig. There is stretched by means of brackets at temperatures between 100 0 C and 110 0 C 4- fold in the transverse direction. The mixture is then postcured again for 10 s at 210.degree. The white PET film has a total thickness of 36 ⁇ m. The absolute transmission lies after measurement according to test method A at 8%.
  • a polyethylene terephthalate copolymer (Advansa Melinar TM B60) was blended with 20% by weight.
  • Titanium dioxide (average diameter 0.25 microns) mixed in a kneader for 2 h at 180 ° C and dried under vacuum. Subsequently, in a single-screw extruder, the film material was extruded through a slot die (T-shape, 300 ⁇ m slot gap) at 280 ° C. The film is applied to a mirrored chill roll. It is then stretched by tempering to 90 to 95 ° C 3.5 times in the longitudinal direction. Then the film moved into a jig. There is stretched by means of brackets at temperatures between 100 ° C and 110 ° C 4-fold in the transverse direction. The mixture is then postcured again for 10 s at 210.degree. The white PET film has a total thickness of 36 ⁇ m. The absolute transmission lies after measurement according to test method A at 5%.
  • a polyethylene terephthalate copolymer (Advansa Melinar TM B60) was used at 12% by weight.
  • Titanium dioxide (average diameter 0.25 microns) mixed in a kneader for 2 h at 180 ° C and dried under vacuum. Subsequently, in a single-screw extruder, the film material was extruded through a slot die (T-shape, 300 ⁇ m slot gap) at 280 ° C. The film is applied to a mirrored chill roll. It is then stretched by tempering to 90 to 95 0 C 3.5 times in the longitudinal direction. Then the film moved into a jig. There is stretched by means of brackets at temperatures between 100 ° C and 110 ° C 4-fold in the transverse direction. The mixture is then postcured again for 10 s at 210.degree. The white PET film has a total thickness of 23 ⁇ m. The absolute transmission is 17% after measurement according to test method A. Foil (color painting):
  • the black paint was made from 4 parts Hardener CVL no. 10 (from Dainippon Ink and Chemicals, Inc.) and 35 parts Daireducer TM V No. 20 (from Dainippon Ink and Chemicals, Inc.) and 100 parts Panacea TM CVL-SPR805 paint (from Dainippon Ink and Chemicals, Inc., a vinyl chloride / vinyl acetate based paint).
  • the black color is applied flat and dried for 48 hours at 45 ° C.
  • the black lacquer-coated side is full-surface and evenly black.
  • the application is about 2 g / m 2 .
  • the film 1 is coated in the lamination process with the polymer 1 on both sides with 50 g / m 2 .
  • the film b) is coated in the lamination process with the polymer 1 on one side with 50 g / m 2 , on the opposite side first with carbon black 1 (50 g / m 2 ) and then with the polymer 1 again with 50 g / m 2 ,
  • the film c) is coated in the lamination process with the polymer 1 on one side at 50 g / m 2 and on the opposite side with soot mass 1 (50 g / m 2 ).
  • Examples 1 to 3 were tested according to test methods A and B.
  • the test method A provides information about the total transmission of the double-sided adhesive tape and thus information about the degree of blackness of the light-absorbing side.
  • the reflection (test B) must not exceed values of 65%, otherwise the gray side is too reflective and the gray side would appear white.
  • Table 1 The results for the inventive examples are shown in Table 1.
  • Examples 1 to 3 have excellent light absorption properties. Furthermore, Examples 1 to 3 show that the reflection and thus the gradation of the white / black shading can be controlled by the filler content.
  • the white film with the lowest filler content and the thinnest layer thickness reflects the least and has the grayest color. In contrast, Example 2 demonstrates that the film b) with the highest white particle content has the lowest gray color.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

Bande adhésive, en particulier pour la réalisation ou le collage d'afficheurs à cristaux liquides optiques (LCD), qui possède une face supérieure et une face inférieure, et qui possède en outre une couche de matière adhésive (c, c') et au moins une feuille de support (a) présentant une face supérieure et une face inférieure. Ladite bande adhésive est caractérisée en ce que la feuille de support possède des propriétés de transparence.
EP05816278A 2005-06-13 2005-12-02 Bandes adhesives double face a proprietes de reflexion et d'absorption de la lumiere, pour la fabrication d'afficheurs a cristaux liquides Withdrawn EP1894060A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005027393A DE102005027393A1 (de) 2005-06-13 2005-06-13 Doppelseitige Haftklebebänder zur Herstellung von LC-Displays mit lichtreflektierenden und absorbierenden Eigenschaften
PCT/EP2005/056416 WO2006133746A1 (fr) 2005-06-13 2005-12-02 Bandes adhesives double face a proprietes de reflexion et d'absorption de la lumiere, pour la fabrication d'afficheurs a cristaux liquides

Publications (1)

Publication Number Publication Date
EP1894060A1 true EP1894060A1 (fr) 2008-03-05

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EP05816278A Withdrawn EP1894060A1 (fr) 2005-06-13 2005-12-02 Bandes adhesives double face a proprietes de reflexion et d'absorption de la lumiere, pour la fabrication d'afficheurs a cristaux liquides

Country Status (8)

Country Link
US (1) US20090035563A1 (fr)
EP (1) EP1894060A1 (fr)
JP (1) JP2008545876A (fr)
KR (1) KR20080027277A (fr)
CN (1) CN101198898A (fr)
DE (2) DE102005027393A1 (fr)
TW (1) TW200643520A (fr)
WO (1) WO2006133746A1 (fr)

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CN102190972B (zh) * 2010-03-14 2014-01-29 宸鸿科技(厦门)有限公司 多层结构的光学黏结层
KR101363929B1 (ko) * 2010-05-10 2014-02-18 주식회사 엘지화학 광반사 조성물 및 이를 이용한 광원은폐 성능이 우수한 집광필름
WO2013095522A1 (fr) * 2011-12-22 2013-06-27 Intel Corporation Ruban de découpage compatible avec les décharges électrostatiques à capacité d'inscription au laser
KR101326736B1 (ko) * 2011-12-29 2013-11-08 최병연 휘도 개선을 위한 액정표시장치의 백라이트 유닛 조립용 특수 테이프와 그의 제조 방법 및 이에 의해 결합된 액정표시장치
JP5912045B2 (ja) * 2012-01-18 2016-04-27 日東電工株式会社 半透明遮光テープ
KR101279793B1 (ko) * 2012-05-14 2013-06-28 (주)윌닉스 액정 글래스 보호기구
KR102353279B1 (ko) * 2013-09-18 2022-01-19 닛토덴코 가부시키가이샤 점착 시트
US9815259B2 (en) 2013-11-18 2017-11-14 Apple Inc. Reworkable adhesive tape for joining device structures
JP6906560B2 (ja) * 2019-04-03 2021-07-21 リンテック株式会社 粘着シートおよび表示体
CN112571904A (zh) * 2019-09-27 2021-03-30 上海仰璞实业有限公司 一种黑色钢带
KR20220070649A (ko) * 2020-11-23 2022-05-31 엘지디스플레이 주식회사 디스플레이 모듈

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US3075853A (en) * 1960-08-08 1963-01-29 Norton Co Pressure sensitive adhesive tape
KR100987679B1 (ko) * 2002-08-12 2010-10-13 디아이씨 가부시끼가이샤 광반사성과 차광성을 겸비한 ｌｃｄ 모듈용 점착 테이프
DE10243215A1 (de) * 2002-09-17 2004-03-25 Tesa Ag Haftklebeband für LCDs

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
DE102005027393A1 (de) 2006-12-21
DE112005003571A5 (de) 2008-07-03
KR20080027277A (ko) 2008-03-26
TW200643520A (en) 2006-12-16
JP2008545876A (ja) 2008-12-18
WO2006133746A1 (fr) 2006-12-21
US20090035563A1 (en) 2009-02-05
CN101198898A (zh) 2008-06-11

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