WO2009145939A1 - Couche adhésive pour film optique multicouche - Google Patents

Couche adhésive pour film optique multicouche Download PDF

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Publication number
WO2009145939A1
WO2009145939A1 PCT/US2009/034295 US2009034295W WO2009145939A1 WO 2009145939 A1 WO2009145939 A1 WO 2009145939A1 US 2009034295 W US2009034295 W US 2009034295W WO 2009145939 A1 WO2009145939 A1 WO 2009145939A1
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WIPO (PCT)
Prior art keywords
meth
acrylate
film
optical article
optical
Prior art date
Application number
PCT/US2009/034295
Other languages
English (en)
Inventor
Clinton L. Jones
Ellen R. BÖSL
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3M Innovative Properties Company
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Publication of WO2009145939A1 publication Critical patent/WO2009145939A1/fr

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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
    • 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
    • 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
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance 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
    • B32B27/06—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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2255/26—Polymeric 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
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • 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
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • 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
    • 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
    • B32B2551/00—Optical elements

Definitions

  • This invention relates to coatings for optical films, and particularly to adhesive layers for multilayer optical films.
  • Adhesive layers are often used to adhere support layers to multilayer optical films.
  • the resulting optical articles are often used in display devices.
  • the operating environment inside of a display device such as a liquid crystal display television, can be rather extreme such that optical articles used in the device can be subjected to high heat and humidity, heat/UV exposure, and thermal shock. Failure of an adhesive layer due to these extreme conditions can cause warping, delamination, loss of stiffness, and discoloring of the optical article.
  • an optical article including a multilayer optical film, a light transmissive support layer, and an adhesive layer disposed between the multilayer optical film and the light transmissive support layer.
  • the adhesive layer includes an aromatic polyester (meth)acrylate oligomer and an aromatic ethylenically unsaturated monomer, wherein the total amount of the aromatic polyester (meth)acrylate oligomer and the aromatic ethylenically unsaturated monomer is at least about 90 wt.% of the adhesive layer.
  • Also disclosed herein is a method of making the optical article and display devices including the optical article.
  • FIGS. 1 and 2 show schematic cross sectional views of exemplary optical articles.
  • FIG. 3 is a graph showing elastic modulus versus temperature for several adhesives.
  • an adhesive layer that may be used to facilitate adhesion between a multilayer optical film and a light transmissive support layer.
  • the adhesive layer is useful for adhering polyester-based multilayer optical films to light transmissive support layers such as polyethylene terephthalate (PET) and polycarbonate.
  • PET polyethylene terephthalate
  • the adhesive layer disclosed herein may be used to provide a number of advantages.
  • the adhesive layer may be used to make optical articles that can be converted with little or no delamination of the article. This includes not only delamination at the interface between the adhesive layer and the multilayer optical film, but also within the multilayer optical film itself.
  • Exemplary converting operations include slitting to obtain articles of a desired width, cross-cutting such as guillotining to obtain articles of a desired length, and die cutting, e.g., flatbed or rotary, to obtain articles of a desired shape.
  • Other converting operations include perforating and punching.
  • the adhesive layer may also provide optical articles that exhibit little or no warping, i.e., remain dimensionally stable, during and after exposure to temperatures and temperature cycles, such as observed in an LCD-TV.
  • the part tolerances must be substantially retained after exposure to elevated temperature for long periods of time or when exposed to temperature cycling.
  • the adhesive layer may also provide optical articles that exhibit little or no warping, i.e., remain dimensionally stable, during and after exposure to temperatures and temperature cycles, such as observed in an LCD-TV.
  • the adhesive layer may also provide optical articles that exhibit preservation of stiffness across a wide range of environmental conditions that include prolonged exposure to high heat and humidity conditions such as 65°C/95 RH testing for 500 hours. Stiffness preservation is desirable to provide a dimensionally stable optical film laminate during the storage and use of the film and assembled LCD. Optical articles that have dimensional instabilities may create aesthetically undesirable images to the viewer of the LCD. When large-sized laminated optical articles are produced, the part tolerances must be substantially retained after exposure to elevated temperature for long periods of time or when exposed to temperature cycling.
  • the adhesive layer may also provide optical articles that exhibit little or no changes in color and/or little or no darkening effects. Significant changes in color of the optical film laminate may contribute to visible defects and unacceptable color, as determined by the viewer of the assembled LCD product.
  • oligomeric materials employed as optical adhesives for DBEF laminates contain aliphatic oligomeric materials, typically with nitrogen-containing segments. Those skilled-in-the-art in developing optical adhesives would typically refrain from incorporating aromatic oligomers due to the concern that the aromatic oligomer would contribute to deleterious color development during environmental aging, in particular, the increase in yellow color shift resulting from accelerated QUV aging (test conditions described below).
  • the adhesive layer may also provide optical articles that exhibit acceptable hand peel adhesion to reduce the potential for delaminating during the converting process and during the useful lifetime of the optical film article.
  • the adhesive layer may also provide optical articles that exhibit an elastic tensile modulus of ⁇ 10 x 10 8 Pa at the converting temperature. Normal converting temperatures are between 15 and 30 0 C, although higher temperatures may be useful. Optical film articles with adhesive layers in the aforementioned elastic modulus range contribute to the reduced potential for delaminating during the converting process and during the useful lifetime of the optical film article.
  • FIG. 1 shows a cross sectional view of an exemplary optical article disclosed herein.
  • Optical article 10 comprises multilayer optical film 12 comprising a plurality of alternating layers of first and second optical layers (not shown), light transmissive substrate 16, and adhesive layer 14 disposed between the multilayer optical film and the light transmissive substrate.
  • the adhesive layer can have any suitable thickness provided it can provide the desired properties. In some embodiments, the thickness is from about 5 to about 40 um.
  • the adhesive layer comprises an aromatic polyester (meth)acrylate oligomer and an aromatic ethylenically unsaturated monomer, wherein the total amount of the aromatic polyester (meth)acrylate oligomer and the aromatic ethylenically unsaturated monomer comprises at least about 90 wt.% of the adhesive layer.
  • polyester refers to polyesters made from a single dicarboxylate monomer and a single diol monomer and also to copolyesters which are made from more than one dicarboxylate monomer and/or more than one diol monomer. In general, polyesters are prepared by condensation of the carboxylate groups of the dicarboxylate monomer with hydroxyl groups of the diol monomer.
  • dicarboxylate and “dicarboxylic acid” are used interchangeably.
  • the adhesive layer comprises a polyester comprising one or more dicarboxylic acids and one or more diols.
  • Useful dicarboxylic acids include aromatic dicarboxylic acids such as naphthalene dicarboxylic acid; terephthalate dicarboxylic acid; phthalate dicarboxylic acid; isophthalate dicarboxylic acid; t-butyl isophthalic acid; tri-mellitic acid; 4,4'-biphenyl dicarboxylic acid; and combinations thereof.
  • Useful dicarboxylic acids include aliphatic dicarboxylic acids such as (meth)acrylic acid; maleic acid; itaconic acid; azelaic acid; adipic acid; sebacic acid; norbornene dicarboxylic acid; bi-cyclooctane dicarboxylic acid; 1 ,6-cyclohexane dicarboxylic acid; and combinations thereof. Any of the aforementioned dicarboxylic acids may be used in their dicarboxylate forms, i.e., as salts, or they may be mono- or diesters of aliphatic groups having from 1 to 10 carbon atoms.
  • Useful diols include diol monomers include those having more than two hydroxyl groups, for example, triols, tetraols, and pentaols, may also be useful.
  • Useful aromatic diols include 1 ,4-benzenedimethanol; bisphenol A; ring-opened bisphenol A diglycidal ether, l,3-bis(2-hydroxyethoxy)benzene; and combinations thereof.
  • Useful aliphatic diols include 1,6-hexanediol; 1 ,4-butanediol; trimethylolpropane; 1 ,4-cyclohexanedimethanol; neopentyl glycol; ethylene glycol; propylene glycol; polyethylene glycol; tricyclodecanediol; norbornane diol; bicyclo-octanediol; pentaerythritol; and combinations thereof.
  • the adhesive layer also comprises a diluent comprises one or more monomers.
  • the diluent is free-radically polymerizable and may comprise an aromatic ethylenically unsaturated monomer.
  • examples include (meth)acrylates such as alkyl esters of (meth)acrylic acid wherein the alkyl group has from 1 to 20 carbon atoms, for example, ethyl acrylate, isobornyl methacrylate, and lauryl methacrylate. Examples of
  • (meth)acrylates include aromatic esters of (meth)acrylic acid such as benzyl methacrylate, phenoxyethyl (meth)acrylate, phenoxy-2-methylethyl (meth)acrylate, phenoxyethoxyethyl (meth)acrylate, 3-phenoxy-2-hydroxypropyl (meth)acrylate, 2,4-dibromophenoxyethyl (meth)acrylate, 2,4,6-tribromophenoxyethyl (meth)acrylate, 4,6-dibromo-2-alkyl phenyl (meth)acrylate, 2,6-dibromo-4-alkyl phenyl (meth)acrylate, 2-(l-naphthyloxy)ethyl (meth)acrylate, 2-(2-naphthyloxy)ethyl (meth)acrylate, 2-(l-naphthylthio)ethyl (meth)acrylate
  • (meth)acrylate refers to both acrylates and methacrylates.
  • vinyl monomers include vinyl esters such as vinyl acetate, styrene and derivatives thereof, vinyl halides, vinyl propionates, and mixtures thereof.
  • the weight ratio of aromatic polyester (meth)acrylate oligomer to aromatic ethylenically unsaturated monomer is from about 30:70 to about 50:50.
  • the adhesive layer is typically prepared by free radical polymerization of an adhesive composition comprising an aromatic polyester (meth)acrylate oligomer and an aromatic ethylenically unsaturated monomer.
  • an initiator included in the polymerizable composition.
  • the initiator can be a thermal initiator, a photoinitiator, or both.
  • examples of initiators include organic peroxides, azo compounds, quinines, nitro compounds, acyl halides, hydrazones, mercapto compounds, pyrylium compounds, imidazoles, chlorotriazines, benzoin, benzoin alkyl ethers, di-ketones, phenones, and the like.
  • Photoinitiators include, but are not limited to, 2-hydroxy-2- methyl-1-phenyl-propane-l-one (e.g., commercially available as DAROCUR 1173 from Ciba Specialty Chemicals), a mixture of 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and 2-hydroxy-2-methyl-l-phenyl-propan-l-one (e.g., commercially available as DARACUR 4265 from Ciba Specialty Chemicals), 2,2-dimethoxy-l,2-diphenylethan-l- one (e.g., commercially available as IRGACURE 651 from Ciba Specialty Chemicals), a mixture of bis(2,6-dimethoxybenzoyl)-2,4,4-trimethyl-pentylphosphine oxide and 1- hydroxy-cyclohexyl-phenyl-ketone (e.g., commercially available as IRGACURE 1800 from Ciba Specialty Chemicals),
  • the photoinitiator is often used at a concentration of about 0.1 to 10 weight percent or 0.1 to 5 weight percent based on the weight of oligomeric and monomer material in the polymerizable composition.
  • the adhesive layer and coating composition may contain other types of additives.
  • such materials should be compatible with the primary components of the coating and coating formulation, and should not adversely affect performance attributes of the optical article.
  • coating aids such as surfactants and coalescing solvents; UV absorbers; hindered amine light stabilizers; defoaming agents; particulates used as, for instance, slip agents; antioxidants; and pH control agents such as buffers or trialkylamines.
  • the method may comprise a continuous process such as a roll-to-roll process in which the adhesive composition is applied between the multilayer layer optical film and the light transmissive substrate as they are being fed concurrently with some fixed intervening gap.
  • the method may also comprise coating the adhesive composition described above onto either the multilayer optical film or the light transmissive substrate, thereby forming a coated article.
  • Any of a variety of coating techniques may be used; example include dip, roll, die, knife, air knife, slot, slide, wire wound rod, and curtain coating.
  • a comprehensive discussion of coating techniques can be found in Cohen, E. and Gutoff, E. Modern Coating and Drying Technology; VCH Publishers: New York, 1992; p.
  • the adhesive composition can be cured using UV radiation or any other suitable curing technique.
  • a thermal initiator may be used in place of the photoinitiator.
  • the multilayer optical film may comprise any of a variety of materials including polyesters such as polyethylene terephthalate, polyethylene naphthalate, copolyesters or polyester blends based on naphthalene dicarboxylic acids; polycarbonates; polystyrenes; styrene-acrylonitriles; cellulose acetates; polyether sulfones; poly(meth)acrylates such as polymethylmethacrylate; polyurethanes; polyvinyl chloride; polycyclo-olefms; polyimides; glass; paper; or combinations or blends thereof.
  • Particular examples include polyethylene terephthalate, polymethyl methacrylate, polyvinyl chloride, and cellulose triacetate.
  • the multilayer optical film is sufficiently resistant to temperature and aging such that performance of the article is not compromised over time.
  • the thickness of the multilayer optical film is typically less than about 2.5 mm.
  • the multilayer optical film may also be an orientable film such as a cast web substrate that is coated before orientation in a tentering operation.
  • the multilayer optical film is suitable for use in optical applications.
  • Useful multilayer optical films are designed to control the flow of light. They may have a transmission of greater than about 90%, and a haze value of less than about 5%, for example, less than 2%, or less than 1%.
  • Properties to consider when selecting a suitable multilayer optical film include mechanical properties such as flexibility, dimensional stability, self-supportability, and impact resistance.
  • the multilayer optical film may need to be structurally strong enough so that the article can be assembled as part of a display device.
  • the multilayer optical film may be used in a wide variety of applications such as graphic arts and optical applications.
  • a useful multilayer optical film may be described as a reflective film, a polarizer film, a reflective polarizer film, a diffuse blend reflective polarizer film, a diffuser film, a brightness enhancing film, a turning film, a mirror film, or a combination thereof.
  • the multilayer optical film may have ten or less layers, hundreds, or even thousands of layers, the layers being composed of some combination of all birefringent optical layers, some birefringent optical layers, or all isotropic optical layers.
  • the multilayer optical film has alternating layers of first and second optical layers, wherein the first and second optical layers have refractive indices along at least one axis that differ by at least 0.04. Multilayer optical films having refractive index mismatches are described in the references cited below.
  • the multilayer optical film may comprise one or more layers of any of the above multilayer optical films such that the primer layer is buried in any one of them, making the article itself a reflective film, a polarizer film, a reflective polarizer film, a diffuse blend reflective polarizer film, a diffuser film, a brightness enhancing film, a turning film, a mirror film, or a combination thereof.
  • Useful multilayer optical films include commercially available optical films marketed as VikuitiTM Dual Brightness Enhanced Film (DBEF), VikuitiTM Brightness Enhanced Film (BEF), VikuitiTM Diffuse Reflective Polarizer Film (DRPF), VikuitiTM Enhanced Specular Reflector (ESR), and VikuitiTM Advanced Polarizing Film (APF), all available from 3M Company.
  • Useful optical films are also described in U.S. 5,825,543;
  • the primer layer of this invention may be an internal layer in a multilayer film construction.
  • substrates include any of those useful in optical applications such as polyester, polycarbonate, poly(meth)acrylates, any of which may or may not be oriented.
  • the light transmissive substrate comprises the stretched polyester film described in commonly assigned US Serial No. 61/041112, filed March 31, 2008.
  • FIG. 2 shows a cross sectional view of another exemplary optical article disclosed herein.
  • Optical article 20 comprises multilayer optical film 24 comprising a plurality of alternating layers of first and second optical layers (not shown).
  • Light transmissive substrates 22 and 26 are disposed on each side of the multilayer optical film, and adhesive layers 28 and 30 are disposed between the multilayer optical film and each light transmissive substrate.
  • this optical article may have the constructions as described in commonly assigned US Serial No. 61/040910, filed March
  • the optical article may be used in a graphic arts application, for example, in backlit signs, billboards, and the like.
  • the optical article may also be used in a display device comprising, at the very least, one or more light sources and a display panel.
  • the display panel may be of any type capable of producing images, graphics, text, etc., and may be mono- or polychromatic, or transmissive or reflective. Examples include a liquid crystal display panel, a plasma display panel, or a touch screen.
  • the light sources may comprise fluorescent lamps, phosphorescent lights, light emitting diodes, or combinations thereof. Examples of display devices include televisions, monitors, laptop computers, and handheld devices such as cell phones, PDAs, calculators, and the like.
  • Edge Delamination Rating is determined by converting the optical film laminate using a steel rule die punch common in the optical film industry.
  • Typical steel rule dies may have a diagonal size of 40 to 52 inches and typically include two or more tabs and/or hole configurations of various design.
  • the part is visually inspected for delamination which may be observed as a decrease in transparency in areas adjacent to the edge of the part, tab or holes. If delamination is observed, the length of the delamination is recorded.
  • a part should have edge delamination less than 1 mm to obtain a pass rating.
  • the percentage of parts with acceptable edge delamination is recorded in Table 4 and is calculated using the following equation:
  • Edge Delamination % pass [(number of parts with edge delamination ⁇ 1 mm) / (total number of parts)] x 100
  • One example of observing dimensional stability in laminates is as follows: Clean two 24.1 cm x 31.8 cm pieces of double-strength glass using isopropyl alcohol to remove any dust. Attach a 22.9 cm x 30.5 cm piece of laminate film to one piece of the glass on the two short sides and one of the long sides, leaving the remaining long side unconstrained.
  • the laminate film can be attached to the glass using 3MTM double-coated tape 9690 (3M, St. Paul, MN) such that the tape is 1.3 cm from the three edges of the glass that will be covered by the three sides of the laminate film.
  • the laminate film is attached to the tape so that it is held above the glass surface by the thickness of the tape (about 0.14 mm).
  • the laminate is adhered to the tape using a 2 kg roller, passing the roller over each tape side one time in each direction.
  • Equivalent thickness and lengths of 1.3-cm wide PET film shim stock are next placed onto the opposite side of the laminate and centered over the tape.
  • the second piece of glass is placed on top of the shims and is exactly aligned with the bottom piece of glass.
  • the clips should be of an appropriate size to apply pressure to the center of the tape approximately 1.9 cm from the edge of the glass.
  • the binder clips are positioned two each on the short sides of the module, each about 1.9 cm from the top edge of the laminate film held between the glass plates of the module.
  • the completed glass plate module is placed in a thermal shock chamber (Model SV4-2-2-15 Environmental Test Chamber, Envirotronics, Inc., Grand Rapids, MI) and is subjected to 84 temperature cycles. Each temperature cycle includes cooling the module to -35°C, followed by holding at that temperature for one hour and then increasing the oven temperature in a single step to 85°C, followed by holding at that temperature for one hour. Following the temperature cycling, the laminate film is then removed from the module and inspected for wrinkles using a surface mapping technique which calculates an average slope of the wrinkles. Lower average slope numbers indicate less warping or wrinkling which is a desirable film attribute. Preferred average slope values are less than 0.15.
  • Degradation of the optical laminate construction can be determined by measuring the shift in color corrdinates as calculated by the DELTA.E value.
  • the DELTA.E value is derived from the individual value shifts of the L*, a*, and b* coordinates defined by the
  • CIE L*a*b* color space developed by the Commission Internationale de l'Eclairage in 1976.
  • a widely used method for measuring and ordering color, CIE L*a*b* color space is a three-dimensional space in which a color is defined as a location in the space using the terms L*, a*, and b*.
  • L* is a measure of the lightness of a color and ranges from zero (black) to 100 (white) and may be visualized as the z-axis of a typical three-dimensional plot having x-, y-, and z-axes.
  • the terms a* and b* define the hue and chroma of a color and may be visualized as the x- and y-axes, respectively.
  • DELTA.E for the optical film laminate should be less than 3.0, preferably less than 2.0, to meet industry expectations for color shift. DELTA.E is calculated using the following equation:
  • subscript f indicates final value and subscript i indicates initial value.
  • the stiffness of the laminates were determined on an INSTRON 3342 equipped with a 5ON load cell and a 3-point bending fixture. Samples strips 25 mm wide were cut from a larger master laminate. The crosshead speed was 0.5 mm/min. Force was applied to the sample via the traveling 5 crosshead, and the sample was contacted with an anvil having a 10 mm diameter. The two lower support anvils had a diameter of 3.94 mm each, and the center-to-center distance of these support anvils was 8.81 mm. Values are measured in N/mm based on the change in force N divided by the crosshead travel distance in mm for given change in force. Multiple sample strips were cut from the same laminate.
  • S t is the stiffness value after aging sample for 500 hours and S 1 is the initial stiffness.
  • the optical film construction delaminates in the creased area and the resulting delaminated substrates are physically separated by hand along the length of the sample.
  • the delamination interfaces are subsequently inspected for using Criteria 1 and Criteria 2 as described in Table 1.
  • Elastic Modulus Elastic tensile modulus was measured according to ASTM D5026-01 over a range of temperatures from - 60 0 C to 70 0 C. The elastic tensile modulus was measured on freestanding adhesive samples produced by casting adhesive between two release liners. Adhesive was applied between two unprimed PET films and pulled through a fixed gap coater with a nominal setting of 10 mils. The PET and adhesive construction was passed at 50 fpm under two focused high intensity 600 W/in "D-bulb" UV lights powered by Fusion UV Systems, Inc. Both pieces of unprimed PET were removed prior to testing elastic modulus on the adhesive samples. Results for 20 0 C, 40 0 C and 60 0 C are reported in Table 4 and shown in FIG. 3. In FIG. 3, elastic modulus versus temperature is shown for
  • AC-4 (30), AC-I (32), and AC-6 (34).
  • Adhesive compositions were prepared as described in Table 3. All compositions contained small amounts of TPO, TINUVIN 928, and/or TINUVIN 123 at less than about 3 wt.% of the composition.
  • the laminated article as shown in FIG. 2 was prepared by concurrently coating two layers of adhesive (28 and 30) between three film layers (between 22 and 24 and between
  • Layer 24 comprised the multilayer optical film, a reflective polarizer, as described in commonly assigned US Serial No. 61/040910 and having a nominal thickness of 33 um and outer skin layers comprised of PETG was employed as the multilayer optical film (i.e., 24 of FIG. 2).
  • Layer 22 comprised stretched PET described in commonly assigned US Serial No. 61/041112 and having a nominal thickness of 142 um.
  • a gain diffuser coating having approximately 8 um diameter beads in an acrylate binder was present on the top surface of layer 22, the top surface being opposite adhesive layer 28.
  • Layer 26 comprised stretched PET described in commonly assigned US Serial No. 61/041112 and having a nominal thickness of 131 um. The stretch axes of layers 22 and 26 were aligned with the block axis of reflective polarizer 24.
  • the adhesive coated films were substantially fully cured in two steps with UV light exposure.
  • a VPS600 UV curing system obtained from Fusion UV Systems was used.
  • low intensity cure was carried out for 20 seconds under low intensity light ( ⁇ 380 nm peak bulbs) with nominal intensity of 26.2 mW/cm 2 and a nominal dosage of 151-260 mJ/cm .
  • high intensity cure was carried out for 10 seconds under high intensity UV light with nominal intensity of 571 mW/cm 2 and a nominal dosage of 855 mJ/cm 2 .

Landscapes

  • Laminated Bodies (AREA)

Abstract

L'invention porte sur un article optique comprenant un film optique multicouche, une couche support transmettant la lumière et une couche adhésive disposée entre le film optique multicouche et la couche support transmettant la lumière. La couche adhésive comprend un oligomère polyester de (méth)acrylate aromatique et un monomère à insaturation éthylénique aromatique, la quantité totale de l'oligomère polyester de (méth)acrylate aromatique et du monomère à insaturation éthylénique aromatique étant d'au moins environ 90 % en poids de la couche adhésive. L'invention porte également sur un procédé de fabrication de l'article optique et sur des dispositifs d'affichage comprenant l'article optique.
PCT/US2009/034295 2008-03-31 2009-02-17 Couche adhésive pour film optique multicouche WO2009145939A1 (fr)

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US61/041,092 2008-03-31

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104425632A (zh) * 2013-08-21 2015-03-18 佳能株式会社 光学装置及其制造方法
US10520655B2 (en) 2010-12-10 2019-12-31 3M Innovative Properties Company Glare reducing glazing articles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4379039A (en) * 1979-12-29 1983-04-05 Toyo Boseki Kabushiki Kaish Ultraviolet curable resin composition
US20010031837A1 (en) * 1998-12-11 2001-10-18 3M Innovative Properties Company Epoxy/acrylic terpolymer self-fixturing adhesive
US20060074214A1 (en) * 2004-10-04 2006-04-06 Kesselmayer Mark A Reactive hot-melt adhesive

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4379039A (en) * 1979-12-29 1983-04-05 Toyo Boseki Kabushiki Kaish Ultraviolet curable resin composition
US20010031837A1 (en) * 1998-12-11 2001-10-18 3M Innovative Properties Company Epoxy/acrylic terpolymer self-fixturing adhesive
US20060074214A1 (en) * 2004-10-04 2006-04-06 Kesselmayer Mark A Reactive hot-melt adhesive

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10520655B2 (en) 2010-12-10 2019-12-31 3M Innovative Properties Company Glare reducing glazing articles
CN104425632A (zh) * 2013-08-21 2015-03-18 佳能株式会社 光学装置及其制造方法
US9570632B2 (en) 2013-08-21 2017-02-14 Canon Kabushiki Kaisha Method of manufacturing the optical apparatus
US9887222B2 (en) 2013-08-21 2018-02-06 Canon Kabushiki Kaisha Method of manufacturing optical apparatus

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