EP1828336A1 - Bandes adhesives a double face servant a produire des affichages a cristaux liquides, et presentant des proprietes de reflexion lumineuse et d'absorption lumineuse - Google Patents

Bandes adhesives a double face servant a produire des affichages a cristaux liquides, et presentant des proprietes de reflexion lumineuse et d'absorption lumineuse

Info

Publication number
EP1828336A1
EP1828336A1 EP05813379A EP05813379A EP1828336A1 EP 1828336 A1 EP1828336 A1 EP 1828336A1 EP 05813379 A EP05813379 A EP 05813379A EP 05813379 A EP05813379 A EP 05813379A EP 1828336 A1 EP1828336 A1 EP 1828336A1
Authority
EP
European Patent Office
Prior art keywords
sensitive adhesive
pressure
adhesive tape
carrier film
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Withdrawn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
EP05813379A
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 EP1828336A1 publication Critical patent/EP1828336A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/41—Opaque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/538—Roughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • 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
    • C09J2301/40—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
    • 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
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/10—Presence of inorganic materials
    • C09J2400/16—Metal
    • C09J2400/163—Metal in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • 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 pressure-sensitive adhesive tapes with multilayer carrier structures and with light-reflecting and absorbing properties for the production of liquid-crystal data displays (LCDs).
  • LCDs liquid-crystal data 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 small one
  • the PSA tapes should be used in a wide temperature range and meet certain optical properties.
  • a field of application are LCD displays that are needed for computers, televisions, laptops, PDAs, mobile phones, digital cameras, etc.
  • Fig. 1 shows the concept of a double-sided adhesive tape with a black absorption layer and a reflection metal layer according to the prior art
  • a concept for the production of black double-sided pressure-sensitive adhesive tapes is the coloring of the carrier material.
  • very preferably double-sided pressure-sensitive adhesive tapes with polyester film supports primarily polyethylene terephthalate, PET
  • PET polyethylene terephthalate
  • the PET supports can also be dyed with carbon black or black color pigments to achieve absorption of the light.
  • the disadvantage of this concept is the low absorption of the light. In very thin carrier layers, only a relatively small number of carbon black or other black pigment particles can be introduced, with the result that no complete absorption of the light is 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.
  • blocking or blocking
  • Blocking is countered by anti-blocking agents (anti-blocking agents, anti-blocking agents).
  • Anti-blocking agents are thus substances that the bonding (blocking, blocking) z.
  • B. reduce or prevent thermoplastic polymer films with themselves or other materials by cold flow or electrostatic charging.
  • silicon dioxide eg silica particles
  • chalk or chalk zeolites are used for the production process of, for example, PET films as anti-blocking agents.
  • Anti-blocking agents are intended to prevent the caking of flat plastic films under pressure and temperature to form blocks. Usually, the antiblocking agents are incorporated into the thermoplastic mixture. The particles then act as spacers.
  • 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. For this case of the design, 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 too
  • the double-sided adhesive tape should be reflective.
  • double-sided pressure-sensitive adhesive tapes which have on one side a metallic layer and a black support.
  • these pressure-sensitive adhesive tapes significant improvement has been achieved in terms of light reflection on one side and absorption on the opposite side, but the anti-blocking agents in the support layer cause irregularities in the reflective side.
  • the PSA may in turn be provided with reflective particles.
  • the achievable reflective properties are only relatively insufficient.
  • JP 2002-350612 describes double-sided adhesive tapes for LCD panels with light-protective properties.
  • the function is achieved by a metal layer applied on one or both sides of the carrier film, wherein in addition the carrier film can still be colored.
  • the adhesive tapes described there have only this function and thus do not connect the light-absorbing function on one side and the light-reflecting function on the other side.
  • JP 2002-023663 also describes double-sided adhesive tapes for LCD panels with light-protective properties. Again, the function is achieved by a metal layer applied on one or both sides on the carrier film.
  • the object of the invention is to provide a double-sided pressure-sensitive adhesive tape in which the influence of impurities (pinholes) in the application is avoided or reduced, and which is able to completely absorb light and reflect on the opposite side.
  • antiblocking agent-containing films for the production of certain double-sided pressure-sensitive adhesive tapes with light-absorbing and light-reflecting properties, as shown below, as
  • Carrier materials are suitable, this accessibility for this purpose for the skilled worker can not be further improved by suitable pretreatment, and the adhesive tapes thus obtained have the desired advantages over the prior art unexpectedly. In particular, surprisingly, no negative influence on the optical properties was found.
  • the invention thus relates to pressure-sensitive adhesive tapes, in particular those for the production of optical liquid crystal data displays (LCDs), comprising a top and a bottom, with light-reflecting properties on the top and light-absorbing properties on the bottom, further comprising a carrier film with a top and a Underside, which is provided on at least one of its sides with a metallic reflective coating, wherein the pressure-sensitive adhesive tape is provided on both sides with a pressure-sensitive adhesive layer, wherein the carrier film has a content of anti-blocking agents of less than 4000 ppm and at least between the Bottom of the carrier film and the pressure-sensitive adhesive layer located on this side at least one light-absorbing ink-carrying layer is provided.
  • LCDs optical liquid crystal data displays
  • Anti-blocking agents in the sense of the invention may e.g. in particular silica particles, but also, for example, other silicas, chalk or chalk, zeolites.
  • the pressure-sensitive adhesive layers may be identical or different.
  • the carrier film is preferably between 4 and 250 ⁇ m, more preferably between 8 and 50 ⁇ m, most preferably between 12 and 36 ⁇ m thick. It is preferably transparent or semi-transparent or less translucent, e.g. Coloring.
  • the carrier film used is roughened on at least one side.
  • the preferred roughness is preferably more than 50 nm and less than 400 nm, in particular less than 300 nm.
  • the determination of the roughness can be done, for example, via AFM (atomic force microscope, Atomic Force Microscope).
  • the roughness data are to be understood as RMS roughnesses.
  • the film can be roughened on both sides, in which case both one side and both sides can show the above-mentioned advantageous roughness values.
  • the side of the carrier foil provided with a metallically reflecting layer is its upper side, that is to say the side of the carrier foil opposite this color layer in the case of a one-sided ink-carrying layer.
  • the metal coating is provided on the underside of the carrier film (that is to say between the ink-carrying layer and the carrier film), in which case the carrier film is preferably translucent.
  • both sides of the carrier film are provided with a metallically reflecting layer.
  • the metallically reflecting layers are metal coatings.
  • the carrier film is vapor-coated on one or both sides with metal, for example aluminum or silver, in particular advantageously via the sputtering process.
  • the layer thickness of the metallically reflecting layers is preferably between 5 nm and 200 nm.
  • a second advantageous variant for producing the metallically reflecting layer is the application of a silver-colored coating.
  • At least one light-absorbing ink-carrying layer is provided between the underside of the carrier film and the pressure-sensitive adhesive layer located on this side.
  • the color-carrying layer is in particular a lacquer layers which preferably have a layer thickness between 0.01 and 5 ⁇ m.
  • color-bearing layers can be provided on both sides of the adhesive tape.
  • this is also paint layers of the thickness specified above.
  • at least one of the color-carrying layers is black, in particular the outermost color-carrying layer.
  • the color-bearing layers can be of different chemical nature and can have different color-bearing pigments, which have an advantageous effect on the light-absorbing properties.
  • the pressure-sensitive adhesive layers preferably have a thickness of 5 ⁇ m to 250 ⁇ m in each case. Furthermore, it is part of the invention to select the individual layers within the double-sided pressure-sensitive adhesive tape independently of one another with regard to the layer thickness, so that e.g. different thickness PSA layers can be applied.
  • the carrier film is provided on both sides with a metallically reflective coating.
  • a pressure-sensitive adhesive tape is shown by way of example in FIG. 2.
  • the inventive pressure-sensitive adhesive tape consists of a carrier film layer with reduced or no anti-blocking agent (a), two metallically reflecting layers (b), a color-bearing layer (c) on the underside and two pressure-sensitive adhesive layers (d) and (d '), wherein the pressure-sensitive adhesives are identical be or differ from each other.
  • the inventive pressure-sensitive adhesive tape has the product structure shown in FIG.
  • the double-sided pressure-sensitive adhesive tape consists of a support film (a) provided with reduced or no antiblocking agent, a metallically reflecting layer (b) on the upper side, a color-bearing layer (c) on the underside and two pressure-sensitive adhesive layers (d) and (d '). ), wherein the PSAs may be identical or different from each other.
  • the inventive pressure-sensitive adhesive tape has the product structure corresponding to FIG. 4.
  • the double-sided pressure-sensitive adhesive tape consists of a support film (a) provided with reduced or no anti-blocking agent, a metallically reflecting layer (b) on the underside, a color-bearing layer (c) on the underside, between the metallically reflecting layer and the latter side PSA layer, and two pressure-sensitive adhesive layers (d) and (d '), wherein the PSAs may be identical or different from one another.
  • the inventive pressure-sensitive adhesive tape has the product structure according to FIG. 5.
  • the double-sided pressure-sensitive adhesive tape consists of a support film (a) provided with reduced or no anti-blocking agent, two metallically reflecting layers (b) on both the upper and lower as well as on the underside, at least two coated on top of each other color-carrying layers (c) and (c ') and two pressure-sensitive adhesive layers (d) and (d 1 ), wherein the PSAs may be identical or different from each other.
  • the examples of Figures 3 and 4 may each have multiple paint layers.
  • all film-like polymer carriers can be used as film carriers, in particular advantageously those which are transparent.
  • film carriers for example, Polyethylene, polypropylene, polyimide, polyester, polyamide, polymethacrylate, fluorinated polymer films, etc. use.
  • polyester films are used, particularly preferably PET films (polyethylene terephthalate).
  • PET films polyethylene terephthalate
  • the films may be relaxed or have one or more preferred directions. Preferred directions are achieved by stretching in one or two directions.
  • films which contain no or only a very small proportion of anti-blocking agents.
  • An example of such a film is e.g. the Hostaphan TM 5000 series from Mitsubishi Polyester Film (PET 5211, PET 5333 PET 5210).
  • PET films In particular for the production of very thin (for example 12 ⁇ m thick) PET films, it is very advantageous if the PET film is coated on both sides with metal and the film contains no or a significantly reduced proportion of anti-blocking agent. Particularly good results were obtained with respect to the avoidance of pinholes. Furthermore, 12 ⁇ m PET films are particularly advantageous because they leave very good adhesive properties for the double-sided adhesive tape, since the film is very flexible and can easily adapt to the surface roughness of the substrates to be bonded.
  • the films may be etched (eg, trichloroacetic acid or trifluoroacetic acid), pretreated with corona or plasma, or equipped with a primer (eg, saran).
  • a colored or semitransparent sheet material can be used, in particular for selected areas of application, wherein the sheet is dyed with color pigments or color-bearing particles.
  • color pigments or color-bearing particles For example, carbon black for blackening and titanium dioxide particles for whitening are suitable.
  • the pigments or particles should advantageously be smaller in diameter than the final layer thickness of the carrier film. Optimal colorations can be achieved with 5 to 40 wt .-% of particles based on the film material.
  • the reflective and thus also light-absorbing layer can be a metallic, in particular silver-colored, lacquer layer on the film, advantageously the reflective layer can also be provided by, in particular, one or two-sided vapor deposition of the film
  • Foil with a metal e.g. Aluminum or silver. This is preferred
  • Aluminum or silver applied very evenly to the foil The use of the metallically reflecting layer, on the one hand, reflects the incident light and, on the other hand, reduces or avoids the transmission of the light through the carrier material. Furthermore, surface roughnesses of the carrier film can be compensated.
  • the color-bearing layers can fulfill various functions.
  • the color layer has the function of the perfect absorption of the external light.
  • the transmission for the double-sided pressure-sensitive adhesive tape in a wavelength range of 300-800 nm is ⁇ 0.5%, more preferably ⁇ 0.1%, most preferably ⁇ 0.01%.
  • this is achieved with a black lacquer layer as a color-carrying layer.
  • the layer consists of a lacquer matrix (cured binder matrix, preferably thermosetting system, but also radiation-curing system possible), wherein color pigments are mixed into the lacquer matrix.
  • varnish materials e.g.
  • Polyesters, polyurethanes, polyacrylates or polymethacrylates are used in conjunction with the paint additives known to those skilled in the art.
  • the color pigments are black; Carbon black or graphite particles are preferably mixed into the binder matrix as color-carrying particles.
  • an electrical conductivity is additionally achieved by this addition at very high additive content (> 20% by weight), so that the inventive double-sided pressure-sensitive adhesive tapes likewise have antistatic properties.
  • a further, preferably further inside, color-carrying layer may also be provided with white color pigments.
  • white color pigments are preferably titanium dioxide pigments.
  • the pressure-sensitive adhesive layers are identical on both sides of the pressure-sensitive adhesive tape of the invention.
  • the pressure-sensitive adhesives of the top and the bottom side of the pressure-sensitive adhesive tape differ from one another with regard to the layer thickness and / or the chemical composition.
  • 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 reflection on the top of the pressure-sensitive adhesive tape should be very high, it should preferably have a high degree of transparency at least on this side of the pressure-sensitive adhesive tape.
  • 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
  • rubber / synthetic rubber as the starting material for the adhesive wide variations are given.
  • 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 being made of all available qualities such as Crepe, RSS, ADS, TSR or CV types, depending according to required purity and viscosity level, and the synthetic rubber or the synthetic rubbers from the group of the 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 butadiene rubbers
  • MR butyl rubbers
  • 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
  • acrylic PSAs and / or methacrylate adhesives are used.
  • (Meth) acrylate PSAs which are obtainable by radical polymerization consist of at least 50% by weight based on at least one acrylic monomer from the group of compounds of the following general formula:
  • the monomers are preferably chosen so that the resulting polymers can be used at room temperature or higher temperatures as pressure-sensitive adhesives, in particular such that the resulting polymers have pressure-sensitive adhesive properties.
  • the comonomer composition is selected such that the PSAs can be used as heat-activable PSAs.
  • the molar masses (weight average) M w 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, isooctyl
  • cycloalkyl alcohols consisting of at least 6 C atoms.
  • the cycloalkyl alcohols may also be substituted, for example by C 1-6 alkyl groups, halogen atoms or cyano groups.
  • Specific examples are cyclohexyl methacrylates, isobornyl acrylate, isobornyl methacrylates and 3,5-dimethyl adamantyl acrylate.
  • monomers are used, the polar groups such as carboxyl, sulfonic and phosphonic, hydroxy, 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-vinylpyrrolidone, N-vinyllactam, dimethylaminoethyl methacrylate,
  • hydroxyethyl acrylate hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, allyl alcohol, maleic anhydride, itaconic anhydride, itaconic acid, glyceridyl methacrylate, phenoxyethyl acrylate, phenoxyethyl methacrylate, 2-butoxyethyl methacrylate, 2-butoxyethyl acrylate,
  • 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 can be used in an advantageous procedure.
  • Norrish I and II photoinitiators are suitable as photoinitiators (Norrish type I reaction: photofragmentation ( ⁇ -cleavage) of the carbonyl compound into an acyl radical and an alkyl radical;
  • Norrish type II reaction intramolecular abstraction of a hydrogen atom in the ⁇ position of the carbonyl group, caused by the photochemically excited carbonyl group, resulting in a diradical that can decompose into an enol and an alkene (ß-cleavage) or cyclized to a cyclobutanol)
  • Examples are benzoin acrylate and a 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.
  • monomers which have a high static glass transition temperature are added to the comonomers described.
  • Suitable components are aromatic vinyl compounds, such as, for example, styrene, wherein the aromatic nuclei preferably consist of C 4 - to cis units 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-butylphenylacrylate, t-butylphenylmethacrylate, 4-biphenylacrylate and -methacrylate, 2-naphthylacrylate and methacrylate and mixtures of those monomers, this list is not exhaustive.
  • the PSAs may be mixed with resins.
  • Suitable tackifying resins to be added are the tackifier resins known to the person skilled in the art. Mention may be made representative of the pinene, indene and rosin resins, their disproportionated, hydrogenated, polymerized, esterified derivatives and salts, the aliphatic and aromatic hydrocarbon resins, terpene resins and terpene phenolic resins and C5, C9 and other hydrocarbon resins. Any combination of these and other resins can be used to adjust the properties of the resulting adhesive as desired.
  • all compatible with the 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.
  • 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
  • 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 on the underside of the pressure-sensitive adhesive tape may also be coated with light-absorbing particles, such as e.g. black color pigments or carbon black or graphite particles, be added as a filler.
  • light-absorbing particles such as e.g. black color pigments or carbon black or graphite particles
  • 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-methoxy-2-hydroxypropiophenone 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, methylthiophenylmorpholinketone, aminoketone , Azobenzoin, thioxanthone, hexarylbisimidazole, triazine or fluorenone, wherein each of these radicals may be additionally substituted with one or more halogen atoms and / or one or more alkyloxy groups and / or one or more amino groups or hydroxy groups.
  • the acrylate PSAs can be prepared as follows:
  • the monomers are chosen so that the resulting polymers can be used at room temperature or higher temperatures as PSAs.
  • T G glass transition temperature
  • the monomers are very preferably selected in accordance with the above, and the quantitative composition of the monomer mixture is advantageously selected such that according to the Fox equation (G1) ( See TG Fox, Bull. Am. Phys Soc., 1 (1956) 123) gives the desired T G value for the polymer.
  • 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.
  • radical sources are peroxides, hydroperoxides and azo compounds, as some non-exclusive examples of typical free-radical initiators may be mentioned here potassium peroxodisulfate, dibenzoyl peroxide, cumene hydroperoxide, cyclohexanone peroxide, di-t-butyl peroxide, azodiisoic acid butyronitrile, cyclohexylsulfonyl acetyl peroxide, diisopropyl percarbonate, t-butyl peroctoate, benzpinacol.
  • 1, 1'-azobis cyclohexanecarboxylic acid nitrile
  • Vazo 88 TM from DuPont
  • AIBN azodisobutyronitrile
  • the weight average molecular weights M w 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 Ethylene glycol monomethyl ether
  • ethers e.g., diethyl ether, dibutyl ether
  • the 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 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 to a low conversion about 10 - 30% out.
  • this polymer syrup may e.g. are shrink-wrapped in films (in the simplest case ice cubes) and then polymerized in water to high sales.
  • These pellets can then be used as acrylate hotmelt adhesives, with film materials which are compatible with the polyacrylate being used with particular preference 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 ,
  • Me is a Group I metal such as lithium, sodium or potassium
  • P L (A) is a growing polymer of the acrylate monomers .
  • the molecular weight of the polymer to be produced is increased by the ratio of initiator concentration
  • Suitable polymerization initiators are, for. As n-propyllithium, n-butyllithium, sec-butyllithium, 2-naphthyllithium, cyclohexyllithium or octyllithium, this list is not exhaustive.
  • difunctional initiators for example 1,1,1,4,4-tetraphenyl-1,4-dilithiobutane or 1,1,1,4,4-tetraphenyl-1,4-dilithioisobutane.
  • Co-initiators 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 directly polymerized 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 # are independently selected or the same - branched and unbranched d- to Ci 8 alkyl radicals; C 3 to C 8 alkenyl radicals; C 3 to Cis alkynyl radicals;
  • R * can be any (especially organic) radical having at least one ester group, amine group, carbonate group, cyano group, isocyano group and / or epoxy group and / or sulfur-substituted C r
  • Cis-alkyl radicals C 3 -C 8 -alkenyl radicals, C 3 -C 8 -alkynyl 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.
  • Alkyl, alkenyl and alkynyl radicals in the various substituents are outstandingly suitable for both linear and branched chains.
  • alkyl radicals containing 1 to 18 carbon atoms are methyl, ethyl,
  • 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,
  • hydroxy-substituted alkyl radicals are hydroxypropyl, hydroxybutyl or hydroxyhexyl.
  • halogen-substituted alkyl radicals are dichlorobutyl, monobromobutyl or
  • 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.
  • C 6 -C 8 -aryl radicals serve, for example, phenyl, naphthyl, benzyl, 4-tert-butylbenzyl or other substituted phenyl, such as ethyl, toluene, xylene, mesitylene, isopropylbenzene,
  • R ⁇ and R # have the meanings given above and R 1 can also be selected independently of R ⁇ and R # from the group listed above for these radicals.
  • the conventional 'RAFT process' usually polymerizes only to low conversions (compare 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 represent the following compounds or atoms: i) halides, such as 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 "NOY, in which Y is a free radical species capable of polymerizing 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
  • WO 96/24620 A1 describes a polymerization process employing very specific radical compounds such as phosphorus-containing nitroxides based on imidazolidine 98/44008 A1 discloses specific nitroxyls based on morpholines, piperazinones and piperazinediones.
  • DE 199 49 352 A1 describes heterocyclic alkoxyamines as regulators in controlled free-radical polymerizations. Corresponding developments of the alkoxyamines
  • 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 invention further relates to a method for producing double-sided adhesive tapes, in particular for use in LCD production or LCD bonding.
  • the method is characterized by the use of a carrier film as already described above without or with a low proportion of blocking agents.
  • Such films are not or poorly processable by known methods.
  • anti-blocking agents or films can be made manageable for use in the pressure-sensitive adhesive tapes as described above when the films are coated on temperature-resistant process films on which the film (eg PET film) can cool before being wound up.
  • the temperature-resistant process foil is wrapped with. A blocking of the film (caking of the individual layers) can thus be avoided without the optical properties of the film change adversely.
  • a low-anti-blocking agent or free film can also be further processed into the desired pressure-sensitive adhesive tapes and at the same time offers the properties desired for the pressure-sensitive adhesive tapes if the carrier film has been roughened before the pressure-sensitive adhesive tape is produced, in particular roughened such that it has a roughness of less than 400 nm, preferably of less than 300 nm, and preferably of more than 50 nm (data as RMS roughnesses).
  • the roughness can advantageously be achieved by nanoimprinting, for example by a lamination process ("entrapment") in which a fleece and / or a fabric is pressed onto the surface of the film
  • An advantageous lamination station consists of at least two rolls between which the desired contact pressure is generated Between the rollers, the web or the fabric is then laminated to the film, thereby transferring its surface structure to the film.
  • the surface structure is produced by the surface of one of the rollers itself on the surface of the film.
  • the film can be pretreated before or after roughening by etching, by treatment with corona or plasma and / or by finishing with a primer.
  • a very preferred process variant for the production of a reflective layer on the film is the one or two-sided vapor deposition of the film with a metal, e.g. Aluminum or silver.
  • a metal e.g. Aluminum or silver.
  • the sputtering process being advantageously controlled so that the aluminum or silver is applied very uniformly. This leads to an optimal reflection of the vapor-deposited film (avoidance of scattering effects).
  • the PET film is vapor-coated on one side or on both sides with aluminum in one working step.
  • a metallic coating advantageously a silver-colored coating
  • a binder matrix is mixed with silver-colored color pigments.
  • Aöls binder matrix are, for example, polyurethanes or polyesters which have a high refractive index and high transparency.
  • the color pigments can be incorporated in a polyacrylate or polymethacrylate matrix and then cured as a lacquer.
  • the color-bearing layers are applied.
  • this layer can be obtained as follows:
  • color pigments are mixed into the paint matrix, in particular black color pigments are selected.
  • varnish materials e.g. Polyesters, polyurethanes, polyacrylates or polymethacrylates are used in conjunction with the paint additives known to those skilled in the art.
  • carbon black or graphite particles are mixed into the binder matrix as color-carrying particles.
  • an electrical conductivity is additionally achieved by this addition at very high additive content (> 20% by weight), so that the inventive double-sided pressure-sensitive adhesive tapes likewise have antistatic properties.
  • the PSA is coated from solution onto the carrier film prepared in particular as described above (more precisely, applied to the carrier film applied on the carrier film
  • the metallically reflecting layers and / or the ink-carrying layers can be pretreat.
  • pretreated with corona or with plasma it can be applied from the melt or from solution, a primer or it can be chemically etched.
  • the corona performance 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). For the production process, it may therefore be necessary to remove the solvent from the PSA.
  • a very preferred method is the 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 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 applied
  • the extrusion dies used can advantageously come from one of the following three categories: T-die, fish-tail die and stirrup nozzle The individual types differ in the shape of their flow channel Orientation experienced.
  • crosslinking is effected with electron and / or UV 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.
  • Typical irradiation devices that can be used are linear cathode systems, scanner systems or segmented cathode systems, if it is an electron beam accelerator.
  • 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. Both crosslinking methods or other methods enabling high-energy irradiation can also be used.
  • the invention further relates to the use of the inventive double-sided pressure-sensitive adhesive tapes for bonding or producing optical liquid-crystal data displays (LCDs), the use for bonding LCD glasses and liquid-crystal data displays which have an inventive pressure-sensitive adhesive tape in their product structure.
  • 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 e.g. Glassine, HPDE or LDPE coated papers are used, which in turn are provided with a release layer based on silicones or fluorinated polymers.
  • 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%.
  • a commercially very strong light source for example overhead projector type Liesegangtrainer 400 KC type 649, halogen lamp 36 V, 400 W
  • This mask contains in the middle a circular opening with a diameter of 5 cm.
  • the double-sided LCD tape is placed on this circular opening. In fully darkened surroundings, the number of pinholes is then counted electronically or visually. These are recognizable as translucent dots when the light source is switched on.
  • 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 is given as the sum of directed and scattered light fractions in%.
  • a conventional for radical polymerizations 200 L reactor was 2400 g
  • Acrylic acid 64 kg of 2-ethylhexyl acrylate, 6.4 kg of N-isopropylacrylamide and 53.3 kg of acetone / isopropanol (95: 5).
  • the reactor was heated to 58 ° C and 40 g of 2,2'-azoisobutyronitrile (AIBN) was added.
  • AIBN 2,2'-azoisobutyronitrile
  • 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).
  • the PSAs are made from solution on a siliconized release paper
  • Anti-blocking agent was laminated with a 13 g / m 2 paper web to avoid blocking. In this state, the film could be wound and stored.
  • the film was coated with aluminum on both sides 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 that passes over the plate.
  • Reference film (AI vapor deposition): A normal 12 ⁇ m PET film from Mitsubishi RNK 12 ⁇ m was coated with aluminum on both sides until a full-surface aluminum layer had been applied on both sides. The film was vapor-deposited at a width of 300 mm by the sputtering method. Here, positively charged, ionized argon gas is fed 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 that passes over the plate.
  • 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 (by Dainippon Ink and
  • the white paint was made from 2 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 of Panacea TM CVL-SP709 paint (from Dainippon Ink and Chemicals, Inc., a vinyl chloride / vinyl acetate based paint).
  • the black ink is applied flat and dried for 48 hours at 45 ° 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 paint is applied flat and dried for 48 hours at 45 ° C.
  • 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 perfectly and evenly black.
  • the application of both colors is 4 g / m 2 .
  • Reference foil 1 black / silver:
  • the black ink is applied flat and dried at 45 ° 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:
  • Example 1 The film 1 is coated in the laminating 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 both sides with 50 g / m 2 .
  • 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 .
  • the pressure-sensitive adhesive tapes according to the invention show no blocking behavior at any stage of their production. This also applies to the wine- or bilaterally metallized film, and even after painting. Such an advantageous behavior could not expect the expert.
  • the invention offers pressure-sensitive adhesive tapes in which the metallically reflecting layer can be completely spared from disturbance in the reflection behavior (caused by antiblocking agent); on the other hand, there are no pinholes in the light absorption (black side).
  • the pressure-sensitive adhesive tape also has improved anchoring of the individual layers since potential anchorage weaknesses can be minimized by substantial absence of antiblocking agent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne une bande adhésive servant notamment à produire ou à coller des affichages de données optiques à cristaux liquides (LCD). Cette bande adhésive comprend : une face supérieure présentant des propriétés de réflexion lumineuse, et une face inférieure présentant des propriétés d'absorption lumineuse, et ; une feuille de support qui comporte une face supérieure et une face inférieure, au moins une de ces faces étant pourvue d'un revêtement à réflexion métallique. Selon l'invention, la bande adhésive comporte une couche adhésive de chaque côté. Ladite bande adhésive est caractérisée en ce que la feuille de support présente une teneur en agents antiadhérents qui est inférieure à 4000 ppm, et en ce qu'au moins une couche chromophore d'absorption lumineuse est disposée au moins entre la face inférieure de la feuille de support et la couche adhésive se trouvant sur cette face.
EP05813379A 2004-12-02 2005-12-02 Bandes adhesives a double face servant a produire des affichages a cristaux liquides, et presentant des proprietes de reflexion lumineuse et d'absorption lumineuse Withdrawn EP1828336A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004058282A DE102004058282A1 (de) 2004-12-02 2004-12-02 Doppelseitige Haftklebebänder zur Herstellung von LC-Displays mit lichtreflektierenden und absorbierenden Eigenschaften
PCT/EP2005/056397 WO2006058911A1 (fr) 2004-12-02 2005-12-02 Bandes adhesives a double face servant a produire des affichages a cristaux liquides, et presentant des proprietes de reflexion lumineuse et d'absorption lumineuse

Publications (1)

Publication Number Publication Date
EP1828336A1 true EP1828336A1 (fr) 2007-09-05

Family

ID=35884081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05813379A Withdrawn EP1828336A1 (fr) 2004-12-02 2005-12-02 Bandes adhesives a double face servant a produire des affichages a cristaux liquides, et presentant des proprietes de reflexion lumineuse et d'absorption lumineuse

Country Status (8)

Country Link
US (1) US20100047518A1 (fr)
EP (1) EP1828336A1 (fr)
JP (1) JP2008522231A (fr)
KR (1) KR20070086884A (fr)
CN (1) CN101068899A (fr)
DE (2) DE102004058282A1 (fr)
TW (1) TW200630453A (fr)
WO (1) WO2006058911A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005027350A1 (de) * 2005-06-13 2006-12-14 Tesa Ag Doppelseitige Haftklebebänder zur Herstellung bzw. Verklebung von LC-Displays mit lichtabsorbierenden Eigenschaften
US20100316816A1 (en) * 2005-12-02 2010-12-16 Tesa Se Double-sided pressure-sensitive adhesive tapes for producing lc-displays having light-reflecting and absorbing properties
DE102007062447A1 (de) * 2007-12-20 2009-06-25 Tesa Ag Doppelseitiges Haftklebeband für Flüssigkristallanzeigesysteme
US9827696B2 (en) 2011-06-17 2017-11-28 Fiberweb, Llc Vapor-permeable, substantially water-impermeable multilayer article
WO2012177996A2 (fr) 2011-06-23 2012-12-27 Fiberweb, Inc. Article multicouches perméable à la vapeur d'eau, mais essentiellement imperméable à l'eau
US10369769B2 (en) 2011-06-23 2019-08-06 Fiberweb, Inc. Vapor-permeable, substantially water-impermeable multilayer article
US9765459B2 (en) 2011-06-24 2017-09-19 Fiberweb, Llc Vapor-permeable, substantially water-impermeable multilayer article
DE102011089367A1 (de) * 2011-12-21 2013-06-27 Tesa Se Haftklebemassen mit hohen Molmassen und enger Molmassenverteilung und Verfahren zu deren Herstellung
KR20150016878A (ko) * 2013-08-05 2015-02-13 주식회사 엘지화학 점착제 조성물, 점착 필름 및 이를 이용한 유기전자장치의 봉지방법
CN104460081A (zh) * 2014-12-10 2015-03-25 深圳市华星光电技术有限公司 一种液晶显示器和用于其的双面胶带
KR20160146240A (ko) 2015-06-12 2016-12-21 전관구 염기성 계면활성제를 이용한 산화은나노 및 은나노 제조 방법
CN108368389B (zh) * 2015-12-24 2021-12-28 株式会社寺冈制作所 双面粘着带
DE102016220691A1 (de) * 2016-10-21 2018-04-26 Tesa Se Mehrlagenverklebung
DE102016220687A1 (de) 2016-10-21 2018-04-26 Tesa Se Plasmabehandlung einer Mehrlagenverklebung
CN207918756U (zh) * 2017-12-19 2018-09-28 德莎欧洲股份公司 超薄型全遮光双面压敏胶带及其卷材产品

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2951093B2 (ja) * 1991-12-02 1999-09-20 帝人株式会社 金属板貼合せ成形加工用ポリエステルフイルム
JP3886121B2 (ja) * 2002-07-29 2007-02-28 日東電工株式会社 粘着テープ
KR100987679B1 (ko) * 2002-08-12 2010-10-13 디아이씨 가부시끼가이샤 광반사성과 차광성을 겸비한 ｌｃｄ 모듈용 점착 테이프
JP4517572B2 (ja) * 2002-11-15 2010-08-04 Ｄｉｃ株式会社 反射・遮光粘着テープ
JP2005060435A (ja) * 2003-08-14 2005-03-10 Three M Innovative Properties Co 両面粘着シート
JP4883745B2 (ja) * 2004-01-27 2012-02-22 日東電工株式会社 粘着テープ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
W. A. MACDONALD: "Polyester Films", 15 October 2003 (2003-10-15), pages 1 - 12, Retrieved from the Internet <URL:http://mrw.interscience.wiley.com/emrw/9780471440260/epst/article/pst478/current/html?toc=no&hd=All,PET> [retrieved on 20100329] *

Also Published As

Publication number Publication date
CN101068899A (zh) 2007-11-07
DE112005002841A5 (de) 2007-10-18
DE102004058282A1 (de) 2006-06-08
KR20070086884A (ko) 2007-08-27
US20100047518A1 (en) 2010-02-25
TW200630453A (en) 2006-09-01
WO2006058911A1 (fr) 2006-06-08
JP2008522231A (ja) 2008-06-26

Similar Documents

Publication Publication Date Title
EP1893710B1 (fr) Bandes adhesives double face a proprietes d&#39;absorption de la lumiere, pour la fabrication ou le collage d&#39;afficheurs a cristaux liquides
WO2006058911A1 (fr) Bandes adhesives a double face servant a produire des affichages a cristaux liquides, et presentant des proprietes de reflexion lumineuse et d&#39;absorption lumineuse
EP1893711B1 (fr) Bandes adhesives double face a proprietes de reflexion et d&#39;absorption de la lumiere, pour la fabrication d&#39;afficheurs a cristaux liquides
EP1910490B1 (fr) Bandes auto-adhesives double face utilisees pour produire des ecrans a cristaux liquides, presentant des proprietes de reflexion de la lumiere et d&#39;absorption
EP1902111B1 (fr) Bandes adhesives double face a proprietes de reflexion et d&#39;absorption de la lumiere, pour la fabrication d&#39;afficheurs a cristaux liquides
EP1902110B1 (fr) Bandes adhesives double face a proprietes d&#39;absorption de la lumiere, pour la fabrication ou le collage d&#39;afficheurs a cristaux liquides
WO2006058913A1 (fr) Bandes adhesives a double face servant a produire des affichages a cristaux liquides, et presentant des proprietes de reflexion lumineuse et d&#39;absorption lumineuse
EP1828337A1 (fr) Bandes adhesives double face permettant de produire des ecrans d&#39;affichage a cristaux liquides presentant des proprietes de reflexion et d&#39;absorption de lumiere
WO2004028797A1 (fr) Bande auto-adhesive pour ecrans a cristaux liquides
WO2006133746A1 (fr) Bandes adhesives double face a proprietes de reflexion et d&#39;absorption de la lumiere, pour la fabrication d&#39;afficheurs a cristaux liquides
WO2007062692A1 (fr) Rubans autoadhesifs double face a proprietes de reflexion et d&#39;absorption de la lumiere pour la fabrication d&#39;ecrans a cristaux liquides (lcd)
WO2007009502A1 (fr) Bandes auto-adhesives double face utilisees pour produire des ecrans a cristaux liquides, presentant des proprietes de reflexion de la lumiere et d&#39;absorption
EP1820058A1 (fr) Rubans auto-adhesifs doubles faces absorbant la lumiere pour realiser ou coller des affichages a cristaux liquides
EP1819795A1 (fr) Bandes adhesives a double face servant a produire ou a coller des affichages a cristaux liquides, et presentant des proprietes d&#39;absorption lumineuse
EP1910893A1 (fr) Bande adhesive double face pour la fabrication d&#39;afficheurs a cristaux liquides, possedant des caracteristiques de reflexion et d&#39;absorption de la lumiere
EP1958020A1 (fr) Rubans autoadhesifs double face a proprietes de reflexion et d&#39;absorption de la lumiere pour la fabrication d&#39;ecrans a cristaux liquides (lcd)
EP1828338B1 (fr) Rubans auto-adhesifs doubles faces, dotes de proprietes reflechissant et absorbant la lumiere, pour realiser des affichages a cristaux liquides

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20070702

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

DAX Request for extension of the european patent (deleted)
RBV Designated contracting states (corrected)

Designated state(s): DE ES FR GB IT

17Q First examination report despatched

Effective date: 20081120

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: TESA SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20111027