Classifications

• • 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
• • 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
  • 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
  • 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
  • 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
  • B32B7/02—Physical, chemical or physicochemical properties
  • B32B7/023—Optical properties
• • 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
  • C09J7/29—Laminated material
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
  • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
• • 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
  • 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
  • C09J2400/00—Presence of inorganic and organic materials
  • C09J2400/20—Presence of organic materials
  • C09J2400/26—Presence of textile or fabric
  • C09J2400/263—Presence of textile or fabric in the substrate
• • 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
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Definitions

• Double-sided pressure-sensitive adhesive tapes for the production or bonding of LC displays with light-absorbing properties Double-sided pressure-sensitive adhesive tapes for the production or bonding of LC displays with light-absorbing properties
• the invention relates to double-sided pressure-sensitive adhesive tapes with multilayer support structures and with light-absorbing properties, in particular for the production or bonding of LC 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 schematically the principle of a double-sided black adhesive tape for light absorption.
• black double-sided adhesive tapes are currently used for this application. There are many concepts for producing these adhesive tapes and the carriers required for them.
• a concept for the production of black double-sided pressure-sensitive adhesive tapes is the coloring of the carrier material.
• double-sided pressure-sensitive adhesive tapes with PET carriers are very preferably used, since they can be punched very well.
• the PET supports are dyed with carbon black or black color pigments to achieve absorption of the light.
• Such systems are currently available commercially, e.g. tesa TM 51965.
• Another concept for producing black double-sided pressure-sensitive adhesive tapes relates to the production of a two-layer or three-layer support material by means of coextrusion.
• Carrier films are usually produced by extrusion.
• Coextrusion coextrudes, in addition to the conventional support material, a second and optionally also a third black layer which fulfills the function of light absorption.
• This concept also has several disadvantages. For example, anti-blocking agents must be used for the extrusion, which then lead to so-called pinholes in the product. These pinholes are optical defects (light transmission at these holes) and negatively affect the operation in the LCD.
• blocking is meant the undesirable property of plastic films and the like above a certain temperature (block point) to adhere to each other even with only slight pressure. Blocking is countered with anti-blocking agents (antiblocking agents, antiblocking 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.
• anti-blocking agent e.g. Silica (e.g., silica particles), chalk or chalk, zeolites.
• 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 or three layers are first formed individually in the nozzle and thus can be implemented only relatively thick carrier layers, with the result that the film is also relatively thick and inflexible and thus to the To be bonded surfaces only badly adapts.
• the black layer must also be relatively thick, otherwise no complete absorption can be realized.
• a further disadvantage is the changed mechanical properties of the carrier material, since at least one black layer is coextruded which has different mechanical properties than the original carrier material (eg 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, there is always a flaw in the double-sided tape.
• a black colored lacquer layer is coated on the carrier material on one side or on both sides. 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 imperfections (pinholes) which are introduced by antiblocking agents during the film extrusion process and which can not be painted over. 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 layers of paint are applied. Here, too, one is limited in the layer thicknesses upwards, since otherwise the mechanical properties of the carrier material would change. There is a trend in the development of LC displays.
• the LC displays should become lighter and flatter, and there is a growing demand for ever larger displays with ever higher resolution. For this reason, the design of the displays has been changed and the light source moves accordingly closer to the LCD panel, with the consequence that the risk increases that more and more light from the outside penetrates into the edge zone of the LCD panel ("blind area” ) (see Fig. 1). With this development, therefore, the requirements for the shading properties ("black out” properties) of the double-sided adhesive tape and thus there is a need for new concepts for the production of black adhesive tapes.
• JP 2002-023663 also describes double-sided adhesive tapes for LCD panels with light-protective properties. Again, the function is achieved by a one or both sides applied to the carrier film metal layer. Furthermore, the patent comprises colored adhesives. In analogy to JP 2002-350612, the cause of the pinholes is again attempted to be compensated only by double-sided metallization of the carrier foils.
• the object of the invention was to provide a double-sided pressure-sensitive adhesive tape in which the influence of impurities (pinholes) in use is avoided or reduced, and which is able to completely absorb light.
• antiblocking agent-containing films are suitable as carrier materials for the production of certain double-sided pressure-sensitive adhesive tapes with light-absorbing properties, as will be illustrated below.
• this accessibility to this purpose can not be further improved for the skilled worker by suitable pretreatment, and so obtained adhesive tapes have the desired advantages over the prior art unexpectedly.
• no negative influence on the optical properties was found.
• the invention thus relates to pressure-sensitive adhesive tapes, in particular those for bonding optical liquid-crystal data displays (LCDs), wherein the pressure-sensitive adhesive tapes have a top and a bottom, wherein the pressure-sensitive adhesive tapes further comprise a carrier film having a top and a bottom, wherein the pressure-sensitive adhesive tape both on the upper side and on the underside are each provided with a pressure-sensitive adhesive layer, and wherein the carrier film has a content of anti-blocking agents of less than 4000 ppm and at least one light-absorbing color-carrying layer is provided between the carrier film and the pressure-sensitive adhesive layers.
• LCDs optical liquid-crystal data displays
• the pressure-sensitive adhesive tape itself has light-absorbing properties on both sides.
• 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 of low light transmittance by eg 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 carrier film is provided on at least one of its sides with a metallically reflecting layer (shiny metallic and light-reflecting).
• both sides of the carrier film are provided with a metallically reflecting layer.
• the metallic reflecting layers are advantageously metal coatings.
• the carrier foil is coated on both sides with metal, e.g. 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.
• the color-carrying layers are in particular lacquer layers, each of which preferably has a layer thickness between 0.01 and 5 ⁇ m.
• color-bearing layers can be provided on both sides of the adhesive tape.
• 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 metal 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), color-carrying layer (c) and two pressure-sensitive adhesive layers (d) and (d 1 ), wherein the pressure-sensitive adhesives are identical or different from one another can distinguish.
• 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, two metallically reflecting layers (b), at least two color-coated layers (c) and (c ') 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) present on one side only, two lacquered color-bearing layers (c) and two pressure-sensitive adhesive layers (d) and (d 1 ), wherein the PSAs may be identical or different from each other.
• the inventive pressure-sensitive adhesive tape has the product structure according to FIG. 5.
• the double-sided pressure-sensitive adhesive tape consists of a carrier foil (a), which is provided with a reduced or no amount of anti-blocking agent, a metallic one reflective layers (b), at least two coated color-carrying layers (c) and (c 1 ) and two pressure-sensitive adhesive layers (d) and (d 1 ), wherein the PSAs may be identical or different from each other.
• film-like polymer carriers can be used as film carriers, in particular advantageously those which are transparent.
• film carriers for example, polyethylene, polyethylene
• 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 are 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, Man achieved here in terms of avoiding Pinholes especially good results.
• 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).
• the film may be colored 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 always 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 on the film is in particular sprayed over one or both sides of the film with a metal, e.g. Aluminum or silver, produced.
• a metal e.g. Aluminum or silver
• the aluminum or silver is applied very evenly on the film.
• the metal layer Through the use of the metal layer, the transmission of light through the substrate is reduced or avoided. 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. However, it may also be advantageous in a specific procedure if 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. Thus, for example, different adhesive properties can be set in this way.
• pressure-sensitive adhesive systems for the inventive double-sided pressure-sensitive adhesive tape acrylate, natural rubber, synthetic rubber, silicone or EVA adhesives are used. In principle, however, it is also possible to process all further PSAs known to the person skilled in the art.
• the natural rubber is not ground to a molecular weight (weight average) below about 100,000 daltons, preferably not below 500,000 daltons, and is additized.
• weight average weight average
• Natural rubbers or synthetic rubbers or any blends of natural rubbers and / or synthetic rubbers can be used, the natural rubber or the natural rubbers in principle 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 (NR) , 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
• NR 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 PSAs 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 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-
• 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-
• Methylolmethacrylamide N- (buthoxymethyl) methacrylamide, N-methylolacrylamide, N-
• 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.
• 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 refractive index of the PSA increases.
• 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.
• plasticizers plasticizers
• other fillers such as, for example, fibers, carbon black, zinc oxide, chalk, solid or hollow glass spheres, microspheres of other materials, silica, silicates
• nucleating agents such as. conjugated polymers, doped conjugated polymers, metal pigments, metal particles, metal salts, graphite, etc.
• blowing agents compounding agents and / or anti-aging agents, e.g. be added in the form of primary and secondary antioxidants or in the form of sunscreens.
• the PSA may also be coated with light absorbing particles, e.g. black color pigments or carbon black or graphite particles, be added as a filler.
• light absorbing particles 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 oxanes, such as. B. 1-phenyl-1,2-propanedione-2- (O-ethoxycarbonyl) oxime.
• Hydroxy groups may be substituted.
• the acrylate adhesives 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 of the polymers of T G ⁇ 25 0 C in accordance with the above the monomers predicted very preferably selected, and the quantitative composition of the monomer mixture advantageously chosen such that after 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
• typical free-radical initiators are potassium peroxodisulfate, dibenzoyl peroxide, cumene hydroperoxide, cyclohexanone peroxide, di-t-butyl peroxide, Azodiisoklarebutyronitril, Cyclohexylsulfonylacetylperoxid, 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) 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 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 ,
• the molecular weight of the polymer to be prepared is controlled by the ratio of initiator concentration to monomer concentration.
• Suitable polymerization initiators are suitable z. 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.
• control reagent of the general formula is then preferably used:
• R ⁇ and R # are independently selected or the same
• Ci 8 -alkyl radicals C 3 to C 8 alkenyl radicals; C 3 to Cis alkynyl radicals; C 1 to C 6 -alkoxy radicals - C 1 - to C 8 -alkyl radicals substituted by at least one OH group or by a halogen atom or by a silyl ether; C 3 to C 8 alkenyl radicals; C 3 to Cis alkynyl radicals;
• C 2 -C 8 -Hetero-alkyl radicals having at least one O atom and / or one NR * group in the carbon chain, where R * may be any (in particular organic) radical, with at least one ester group, amine group, carbonate group, cyano group, isocyano group and / or epoxy group and / or with sulfur-substituted d-cis-alkyl radicals, C 3 -C 8 -alkenyl radicals, C 3 -C 8 -alkynyl radicals; C 3 -C 2 -cycloalkyl radicals-C 6 -C 8 -aryl or benzyl 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
• alkynyl of 3 to 18 carbon atoms examples include propynyl, 2-butynyl, 3-butynyl, n-2-octynyl and n-2-octadecynyl.
• hydroxy-substituted alkyl radicals are hydroxypropyl, hydroxybutyl or
• 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.
• 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 denote the following compounds or atoms: i) halides, such as chlorine, bromine or iodine ii) linear, branched, cyclic and heterocyclic hydrocarbons having 1 to 20
• Compounds of (Va) or (Vb) may also be bonded to polymer chains of any kind (primarily in the sense that at least one of the above radicals represents such a polymer chain) and thus be used for the construction of polyacrylate PSAs.
• TEMPO 2,2,6,6-tetramethyl-1-piperidinyloxy
• 4-benzoyloxy-TEMPO 4-methoxy-TEMPO
• 4-chloro-TEMPO 4-hydroxy-TEMPO
• 4-oxo-TEMPO 4- Amino-TEMPO, 2,2,6,6, -tetraethyl-1-piperidinyloxy, 2,2,6-trimethyl-6-ethyl-1-piperidinyloxy • N-tert-butyl-1-phenyl-2-methylpropyl nitroxide
• Initiator uses a compound of the formula R'R "N-O-Y, wherein Y is a free radical
• Species is that can polymerize unsaturated monomers. However, the reactions generally have low conversions. Particularly problematic is the polymerization of Acrylates, which runs only to very low yields and molecular weights.
• WO 98/13392 A1 describes open-chain alkoxyamine compounds which have a symmetrical substitution pattern.
• EP 735 052 A1 discloses a process for producing thermoplastic elastomers having narrow molecular weight distributions.
• WO 96/24620 A1 describes a polymerization process in which very specific radical compounds such. As phosphorus-containing nitroxides based on imidazolidine can be used.
• WO 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 or of the corresponding free nitroxides improve the efficiency for the preparation of polyacrylates.
• ATRP polyacrylate PSA atom transfer radical polymerization
• initiator preferably monofunctional or difunctional secondary or tertiary halides and for the abstraction of (halide) (e) 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).
• halide e
• 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 microroughness of the film surface can be finely adjusted by choosing a suitable polish. In this case, several polishing operations can be provided in succession. To improve the adhesion of the following layers to the film, it can be pretreated before or after roughening by etching, by treatment with corona or plasma and / or by finishing with a primer.
• the film layer is vapor-coated on one or both sides with a metal, for example aluminum or silver.
• a metal for example aluminum or silver.
• the sputtering process for evaporation being advantageously controlled so that the aluminum or silver is applied very uniformly.
• the PET film is vapor-coated on one side or on both sides with aluminum in one working step.
• 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, on the layers applied to the carrier film).
• the PSA is coated from solution onto the carrier film prepared in particular as described above (more precisely, on the layers applied to the carrier film).
• 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 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). For the production process, it may therefore be necessary to remove the solvent from the PSA.
• a very preferred method is the concentration over an on 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 coating is used.
• the extrusion dies used can advantageously come from one of the following three categories: T-die, fishtail die and stirrup nozzle The individual types differ in the shape of their flow channel get an orientation.
• 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.
• Electron Beam Processing in Chemistry and Technology of UV and EB formulation for Coatings, Inks and Paints, Vol. 1, 1991, SITA, London.
• 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 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 eg 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.
• 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 ° 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 coated from solution onto a siliconized release paper (PE.coated release paper from Loparex), dried for 10 minutes in an oven at 100 ° 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 12 ⁇ m PET film from Mitsubishi (Hostaphan TM 5210) extruded without 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. After unwinding and removing the nonwoven, 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. In this case, positively charged, ionized argon gas is passed into a high-vacuum chamber. The charged ions then hit a negative loaded Al plate and solve on a molecular level aluminum particles, which then deposit on the polyester film, which is passed 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 Panacea TM CVL-SP709 (from Dainippon Ink and Co., Ltd.)
• the white color is applied flat and dried at 45 ° C. for 48 hours.
• the application is 2 g / m 2 each.
• it is painted again on both sides with the black paint. It is dried again at 45 ° C for 48 hours.
• the double coated sides are perfectly and evenly black.
• the mass application of both colors is 4 g / m 2 per side.
• Reference foil 1 black / black:
• the black ink is applied flat and dried at 45 ° C. for 48 hours.
• the sides coated with black paint are completely and evenly black.
• the application is about 2 g / m 2 each.
• Reference foil 2 black / black:
• the white color is applied flat and dried at 45 ° C. for 48 hours.
• the application is 2 g / m 2 each.
• it is painted again on both sides with the black paint. It is dried again at 45 ° C for 48 hours.
• the double coated sides are perfectly and evenly black.
• the mass application of both colors is 4 g / m 2 per side.
• 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 .
• Reference Example 1
• 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 one or two-sided painting. Such an advantageous behavior could not expect the expert.
• Very thin pressure-sensitive adhesive tapes (by using a very thin, for example 12 ⁇ m thin film) can be offered by the invention for the first time, but in which there is a very good black coloration and thus an excellent (very high) Lichtabsorbtionserhalten. These pressure-sensitive adhesive tapes allow much more optimized bonding options in the production and also in the installation (bonding) of liquid crystal displays.

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• 2005
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  • 2005-12-02 WO PCT/EP2005/056398 patent/WO2006058912A1/de active Application Filing
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