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WO2014130507A1 - Adhésifs multicouche optiquement transparents, mousses, bandes de transfert et articles comprenant ces adhésifs - Google Patents

Adhésifs multicouche optiquement transparents, mousses, bandes de transfert et articles comprenant ces adhésifs Download PDF

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Publication number
WO2014130507A1
WO2014130507A1 PCT/US2014/017045 US2014017045W WO2014130507A1 WO 2014130507 A1 WO2014130507 A1 WO 2014130507A1 US 2014017045 W US2014017045 W US 2014017045W WO 2014130507 A1 WO2014130507 A1 WO 2014130507A1
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WIPO (PCT)
Prior art keywords
adhesive
adhesive layer
acrylate
methacrylate
layer
Prior art date
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Ceased
Application number
PCT/US2014/017045
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English (en)
Inventor
Chan U. Ko
Prakash Mallya
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Avery Dennison Corp
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Avery Dennison Corp
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Publication of WO2014130507A1 publication Critical patent/WO2014130507A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • 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
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
    • 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
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • 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
    • C09J2423/00—Presence of polyolefin
    • 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
    • C09J2425/00—Presence of styrenic polymer
    • 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
    • C09J2433/00—Presence of (meth)acrylic polymer

Definitions

  • the present invention provides ad hesives, such as pressu re sensitive adhesives, including optically clear ad hesives.
  • the invention also relates to articles employing such adhesives.
  • the adhesive is useful in various applications including, but not limited to, adhering su bstrates together, a nd is particularly useful for adhering an optically clear su bstrate to an article, e.g., adhering a display screen or panel to form electronic devices including but not limited to, cellular devices, smart phones, ta blet applications, etc.
  • Optically clear adhesives are used to bond together a clear su bstrate to another su bstrate in a pplications where it is desira ble that the optical clarity of the su bstrate not be impaired or diminished by the adhesive.
  • an optically clear adhesive is used to secure a display screen to the electronic device.
  • the adhesives must provide sufficient adhesive strength to bond the articles together and prevent detachment. Often, adhesives that exhibit excellent adhesion are not reworkable and the film can tear or stretch upon attempting to reposition or adjust the position of the clear substrate (e.g., the display screen) on the device.
  • the present invention provides a multilayered adhesive having two layers.
  • the adhesive comprises a soft optically clear adhesive (OCA) layer and a firm optically clear adhesive layer.
  • the present invention provides a multilayered adhesive comprising a first soft optically clear adhesive layer, a firm optically clear adhesive layer, and a second soft optically clear adhesive layer, where the firm optically clear adhesive layer is disposed in between the first and second soft optically clear adhesive layers.
  • An additional aspect of the invention is a two-layer optically clear adhesive that is used in an electronics application.
  • An additional aspect of the invention is a three-layer optically clear adhesive that is used in an electronics application.
  • the combination of the soft adhesive layer with the firm adhesive layer, and optionally with another soft adhesive layer provides an adhesive with excellent properties. While providing a soft adhesive with good flow or wetting properties to avoid air gaps or bubbles, the adhesives have sufficient strength such that they can be repositioned or reworkable in adhering substrates together. The adhesives can be removed as one piece without tearing or substantial stretching of the adhesive. The adhesives can also provide easier handling than other typical softer adhesives, including easier processing such as die-cutting. The adhesives can also exhibit sufficient softness to provide cushioning or impact absorption properties.
  • FIG. 1 is a schematic side view of a multilayered adhesive construction in accordance with an embodiment of the present invention
  • FIG. 2 is a schematic side view of a multilayered adhesive construction in accordance with an embodiment of the present invention.
  • FIG. 3 is a schematic side view of a multi-layered optically clear adhesive in relation to an optically clear su bstrate;
  • FIG. 4 is a schematic side view of a two layered adhesive in relation to substrate.
  • FIG. 5 is a schematic side view of a three layer adhesive in relation to substrate.
  • the adhesive can be an optically clear adhesive (OCA).
  • OCA optically clear adhesive
  • the adhesive comprises a first, uppermost adhesive layer comprising a soft adhesive, and a second layer adjacent and beneath the first adhesive layer that comprises a firm adhesive, where the soft adhesive layer and the firm adhesive can have a hardness property such that the hardness property of the soft adhesive layer is lower than the hardness property of the firm adhesive. That is, the soft adhesive layer is softer than the firm adhesive layer.
  • the adhesive comprises a first soft adhesive layer, a second soft adhesive layer, and a firm adhesive layer disposed between the first and second soft adhesive layers.
  • the adhesive comprises two layers, a soft optically clear adhesive layer and a firm optically clear adhesive layer adjacent the soft adhesive layer. In another embodiment, the adhesive comprises three layers, a first soft optically clear adhesive layer, a second soft optically clear adhesive layer, and a firm optically clear adhesive layer disposed between the first and second soft adhesive layers.
  • the hardness property of the adhesive layers is chosen from the glass transition temperature of the adhesive layer, the modulus of the adhesive layer, or a combination thereof.
  • the uppermost soft adhesive layer has a glass transition temperature, a modulus, or both that is less than the glass transition temperature, modulus, or both of the firm adhesive layer.
  • the first and second soft adhesive layers independently have a glass transition temperature, or both that is less than the glass transition temperature, the modulus, or both of the first adhesive layer.
  • the properties of the first and second soft adhesive layers can be the same or different.
  • the second soft adhesive layer has a glass transition temperature, a modulus, or both that is higher than that of the first adhesive layer.
  • FIG. 1 illustrates an embodiment of a two layer adhesive construction.
  • a multilayered adhesive 100 comprises a soft adhesive layer 110 and a firm adhesive layer 120 adjacent the soft adhesive layer.
  • the soft and firm adhesive layers are optically clear adhesives.
  • FIG. 2 illustrates an embodiment of a three layer adhesive construction.
  • a multilayered adhesive 200 comprises a first soft adhesive layer 210, a second soft adhesive layer 220, and a firm adhesive layer 230 disposed between the first and second adhesive layers.
  • each of the soft adhesive layers and the firm adhesive layer are optically clear adhesives.
  • the adhesives for the respective layers can be selected as desired to provide an adhesive with properties suitable for an intended application.
  • the soft adhesive layer(s) can comprise a material chose from acrylic based or non-acrylic based materials.
  • Acrylic based adhesives comprise acrylic monomers.
  • the term "acrylic monomer" refers to any monomer in the class of free-radical polymerizable monomers that includes acrylic acid, methacrylic acid, acrylamide, methacrylamide, acrylonitrile, and derivatives thereof.
  • Non-limiting examples include alkyl (meth)acrylates, hydroxyalkyl (meth)acrylates, alkyl (meth)acrylamides, alkyl di(meth)acrylates, ethylenically unsaturated carboxylic acids, epoxy (meth)acrylates (e.g., glycidyl (meth)acrylate), ethoxylated (meth)acrylates, cyanoacrylates, etc. Also included are acrylic-, (meth)acrylamido-, and (meth)acrylonitrile-terminated macromers.
  • Alkyl (meth)acrylates are well known and commonly used in the preparation of acrylic PSAs. Nonlimiting examples include methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, nonyl, decyl, undecyl, and dodecyl acrylate, and the corresponding methacrylates. Cyclic acrylates and methacrylates, e.g., cyclohexyl acrylate, isobornyl acrylate, are also included.
  • (Meth)acrylates with 4-12 carbon atoms per alkyl group are considered “soft” monomers, and form copolymers with lower glass transition temperatures (Tg's) than so-celled "hard” monomers, e.g., methyl (meth)acrylate, ethyl methacrylate, etc.
  • Non-limiting examples of hydroxyalkyl (meth)acrylates include hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), and hydroxypropyl acrylate.
  • Non-limiting examples of alkyl (meth)acrylamides include acrylamide, methacrylamide, N-methylol (meth)acrylamide, N-ethanol acrylamide, ⁇ , ⁇ -dimethyl (meth)acrylamide, N-t-butyl acrylamide, octyl-acrylamide, etc.
  • alkyl di(meth)acrylates include dimethylaminoethyl di(meth)acrylate, 1,6-hexanediol diacrylate, diethyleneglycol di(meth)acrylate, triethyleneglycol di (meth)acrylate, etc.
  • Non-limiting examples of ethylenically unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, beta-carboxyethyl acrylate (beta-CEA), and higher oligomers of acrylic acid.
  • (Meth)acrylic-, (meth)acrylamido-, and (meth)acrylonitrile-terminated macromers are rubber or acrylic polymers of small to medium chain length (N w from about 2,000 to 25,000) terminated with a (meth)acrylic, (meth)acrylamido, or (meth)acrylonitrile functional group or for example, adhesives sold under the trade name K ATON.
  • non-acrylic monomer refers to a free-radical polymerizable monomer having a vinyl or other ethylenically unsaturated group, other than acrylic monomers.
  • Non-limiting examples include allylic monomers, styrenic monomers (e.g., styrene, alpha-methyl styrene, t-butyl- styrene, 4-methoxy-styrene, 3-ethyl-styrene, 4-ethyl-styrene, and 1,4- or 1,3 divinyl-benzene), N-vinyl lactams (e.g., N-vinyl pyrrolidone), vinyl pyridine, vinyl esters (e.g., vinyl acetate, vinyl butyrate, vinyl propionate, vinyl isobutyrate, vinyl valerate, and vinyl versitate), sodium vinyl sulfonate, and dialkyl maleates and fumarates (
  • the soft adhesive layer can comprise rubber based adhesives. It will be appreciated that rubber based adhesives may not be particularly suitable for applications requiring an optically clear adhesive because rubber based adhesives typically have a high haze and are yellowish in color. Such adhesives, however, may be suitable for other applications where advantages of the present adhesives constructions can be beneficial. In one embodiment, rubber based adhesives may be suita ble for bonding to a substrate having a low surface energy.
  • the rubber based adhesive can be a natural or synthetic rubber material.
  • the rubber based pressure-sensitive adhesive can comprise natural and/or synthetic elastomeric polymers based on synthetic or natural rubber, such as natural rubber (polyisoprene), polybutadiene, synthetic polyisoprene, random styrene-butadiene (SB) polymers, SB block copolymers, multi-armed and repeating SB copolymers.
  • Styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-butadiene, and styrene-isoprene copolymers, block, random, or multi-armed copolymers, and blends and mixtures thereof may also be used.
  • suitable rubber based adhesive include, but are not limited to, those described in U.S. Pat. No. 5,290,842, the entire disclosure of which is incorporated herein by reference.
  • Adhesives suitable for use in the soft adhesive layer include, but not limited to, rubber based adhesives, which typically contain relatively mobile ingredients.
  • the mobile ingredients of these adhesives normally consist of oils, resins, tackifiers, or other organic molecules added during the adhesive formulation process.
  • mobile ingredients may also be of natural origin or may result as a byproduct of the manufacturing process.
  • mobile ingredients may also result from degradation of one or more components of the adhesive formulation during processing or use.
  • Migration of these mobile ingredients may result in the adhesive layer losing some of its adhesive strength, since many of these mobile ingredients are added to enhance adhesion. Thus, it is generally desirable to confine migratory mobile species to their original environment within the construction.
  • Examples of mobile ingredients used in rubber-based adhesive formulations include, but are not limited to, hydrogenated aromatic resins wherein a significant portion of the benzene rings are converted to cyclohexane rings (e.g., the REGALREZ family of resins manufactured by Hercules of Passaic, New Jersey, and the ARKON family of resins manufactured by Arakawa Chemical of Chicago, III.); hydrogenated polycyclic resins (e.g., ESCOREZ 5300, 5320, 5340, and 5380 manufactured by Exxon of Irving, Tex.); and plasticizer oils (e.g., SHELLFLEX 371 manufactured by Shell of Houston, Tex., and KAYDOL mineral oil manufactured by Witco of Greenwich, Conn.).
  • An extended list of acrylic and non-acrylic monomers used to prepare PSAs is found in Appendix 15A of the Handbook, at pages 444-450, incorporated by reference herein and attached hereto as Appendix I.
  • the hardness properties of the adhesive layer can be defined by the glass transition temperature of the adhesive layer, the modulus of the adhesive layer, or both.
  • the properties of the soft adhesive layer(s) can be selected as desired for a particular purpose or intended use.
  • the adhesive of the soft adhesive layer(s) have a glass transition temperature (Tg) of about -5 Q C or less; about -10 Q C or less; even about -20 Q C or less.
  • the adhesive of the soft adhesive layer has a glass transition temperature of about -5 5C to about -20 5C; about -10 to about -15 ⁇ C; -5 to about -10 ⁇ C; even about -15 to about -20 Q C.
  • Tg glass transition temperature
  • the adhesive of the soft adhesive layer has a glass transition temperature of about -5 5C to about -20 5C; about -10 to about -15 ⁇ C; -5 to about -10 ⁇ C; even about -15 to about -20 Q C.
  • the adhesive for the soft adhesive layers can have a modulus (G') of about 1 x 10 s dyne/cm 2 to about 3 x 10 s dyne/cm 2 (about 10 kPa to about 30 kPa); from about 1.2 x 10 s dyne/cm 2 to about 2.8 x 10 s dyne/cm 2 (about 12 kPa to about 28 kPa); from about 1.5 x 10 s dyne/cm 2 to about 2.5 x 10 s dyne/cm 2 (about 15 kPa to about 25 kPa); even from about 1.7 x 10 s dyne/cm 2 to about 2.2 x 10 s dyne/cm 2 (about 17 kPa to about 22 kPa).
  • G' modulus
  • the first and second soft adhesive layers can be formed from the same or different adhesive compositions, and can have the same or different properties.
  • the second soft adhesive layer (the lower most adhesive layer) has a hardness that is greater than the corresponding hardness property of the first soft adhesive layer but less than the corresponding property of the firm adhesive layer.
  • the soft adhesive layer is optically clear.
  • the term "optically clear adhesive” refers to a material that has a luminous transmittance of greater than about 99 percent, a haze of less than about 1 percent, Typically, the adhesive may be visually free of bubbles.
  • the optically clear adhesive can have a luminous transmittance of about 99.2 percent or greater, 99.5 percent or greater, 99.7 percent or greater, 99.9 percent greater, even 100 percent.
  • the soft adhesive layer can have a thickness as desired for a particular purpose or intended application.
  • the soft adhesive layer has a thickness of from about 1 micron to about 150 micron; from about 10 micron to about 10 micron to about 125 micron; from about 25 micron to about 100 micron; even from about 50 micron to about 75 micron.
  • the adhesive for the soft adhesive layer does not have to be an optically clear adhesive where optically clarity is not a concern.
  • the adhesive can have a transmittance less than 99%.
  • the firm adhesive layer can comprise an adhesive material chosen from an acrylic based adhesive, a rubber based adhesives, synthetic block copolymers, etc.
  • the firm adhesive layer is provided such that it has one or more properties that render it to be firmer or harder than the soft adhesive layer(s).
  • Acrylic based adhesives for the firm adhesive can comprise acrylic based monomers as described above with respect to the soft adhesive and can also include a sufficient number of hard monomers such as, for example, methyl (meth)acrylate, ethyl methacrylate, etc.
  • the firm adhesive layer can also act as a barrier layer that can prevent migration of the migratory species present in the soft adhesive layer(s) or be substantially resistant to other materials such as plasticizers.
  • Suitable acrylic-based pressure-sensitive adhesives that can act as a barrier layer include those that comprise polymers of acrylic monomers, polymers of methacrylic monomers, and copolymers, blends, or mixtures thereof, which may include smaller amounts of non-acrylic monomers such as vinyl acetate and other vinyl esters, styrene and substituted styrenes, fumarates, maleates, vinyl lactams, and any other olefinic unsaturated monomers which copolymerize with acrylate and methacrylate.
  • polymers of the following monomers, and copolymers, blends, or mixtures thereof may also be used to form suitable barrier layers: methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-amyl acrylate, isoamyl acrylate, n-hexyl acrylate, isohexyl acrylate, cyclohexyl acrylate, isooctyl acrylate, 2- ethyl hexyl acrylate, decyl acrylate, lauryl acrylate, stearyl acrylate, isobornyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate,
  • Acrylic-based polymer resins can be applied using a variety of techniques, most preferably as a 100% solid via hot melt, solvent, or emulsion coating, or as a syrup followed by irradiation polymerization, or by any other means known to those of skill in the art. These polymer compositions can be used in their commercially available form, or as modified with physically compatible plasticizers and tackifiers, such as rosin-based, hydrocarbon, or terpene-phenolic resins.
  • the adhesive of the firm adhesive layer(s) have a glass transition temperature (Tg) of about 5 Q C or greater; 10 Q C or greater; 15 Q C or greater; 20 Q C or greater; even 25 Q C or greater.
  • Tg glass transition temperature
  • the adhesive of the soft adhesive layer has a glass transition temperature of 5 to 25 ⁇ c, 10 to 20 even 12 to 15 ⁇ c. It will be appreciated that the adhesive for the soft adhesive layer does not have to be an optically clear adhesive where optically clarity is not a concern. In such embodiments, the adhesive can have a transmittance less than 99%.
  • the firm adhesive has a modulus (G') of about 2 x 10 s dyne/cm 2 to about 4 x 10 s dyne/cm 2 (about 20 kPa to about 40 kPa); from about 2.2 x 10 s dyne/cm 2 to about 3.8 x 10 s dyne/cm 2 (about 22 kPa to about 38 kPa); even from about 2.5 x 10 s dyne/cm 2 to about 3.5 x 10 s dyne/cm 2 (about 25 kPa to about 35 kPa).
  • G' modulus
  • the firm adhesive layer can have a thickness as desired for a particular purpose or intended application.
  • the firm adhesive layer has a coat weight of from about 1 micron to about 150 micron; from about 10 micron to about 125 micron; from about 25 micron to about 100 micron; even from about 50 micron to about 75 micron.
  • the adhesive for the soft adhesive layer does not have to be an optically clear adhesive where optically clarity is not a concern.
  • the adhesive can have a transmittance less than 99%.
  • the firm adhesive layer is optically clear.
  • optically clear adhesive refers to a material that has a luminous transmittance of greater than 99 percent, a haze of less than about 1 percent. Typically, the optically clear adhesive may be visually free of bubbles. In one embodiment, the optically clear adhesive can have a luminous transmittance of about 99.2 percent or greater, 99.5 percent or greater, 99.7 percent or greater, 99.9 percent greater, even 100 percent.
  • the firm adhesive layer desirably maintains optical clarity, bond strength, and resistance to tearing over the lifetime of the article in which it is used.
  • the individual layers can exhibit su bstantial optical clarity or transparency.
  • the overall adhesive construction further exhibits excellent optical clarity such that it can be used in optical applications.
  • the adhesive construction has haze value of about 1 percent or less; about 0.9 percent or less, about 0.7 percent or less; about 0.5 percent or less; even about 0.1 percent or less.
  • the adhesives are capable of adhering to a wide variety of surfaces.
  • the protective films are capable of adhering to and removable from surfaces such as stainless steel, painted steel, polycarbonate, rigid polypropylene, and chrome plated surfaces.
  • the adhesives are suitable for adhering to low surface energy surfaces.
  • the adhesive can be applied to, and exhibit the adhesion characteristics described herein, when adhered to a surface having a surface energy of about 50 dynes per centimeter or less; about 45 dynes per centimeter or less; about 40 dynes per centimeter or less; even about 35 dynes per centimeter or less.
  • the surface has a surface energy of from about 5 dynes per centimeter to about 50 dynes per centimeter; about 10 dynes per centimeter to about 45 dynes per centimeter; about 15 dynes per centimeter to about 40 dynes per centimeter; even about 20 dynes per centimeter to about 35 dynes per centimeter.
  • the soft adhesive layer exhibits good adhesion to substrates having a low surface energy. The ability to adhere to a low energy surface can be a property of the soft adhesive layer (for two layer constructing) or the second as lower most soft adhesive layer (in three layer constructing).
  • the adhesive layers can be formed by any suitable method.
  • Nonlimiting examples of conventional PSA coating methods include slot die, air knife, brush, curtain, extrusion, blade, floating knife, gravure, kiss roll, knife-over-blanket, knife-over-roll, offset gravure, reverse roll, reverse smoothing roll, rod, and squeeze roll coating.
  • the adhesive composition can be coated on a release liner (e.g., a silicone-coated paper or film), air-or oven-dried, and then laminated to a flexible backing, i.e., a facestock.
  • the adhesive can be coated directly on a facestock, dried, and then protected with a release liner.
  • Self-wound tapes also can be prepared, e.g., by coating he adhesive on one side of a rape facestock. (The other side of the facestock is silicone-coated or otherwise treated so the tape can be wound up on itself without blocking.)
  • the adhesive layers can be separately coated onto a facestock or release liner, dried, and then laminated together.
  • the adhesive layers can be sequentially coated by coating a first adhesive layer, and then coating the next desired adhesive layer over the first adhesive layer prior to complete drying of the first adhesive layer.
  • the adhesive construction can then be fully cured or dried after coating the respective layers.
  • the adhesive layers can be coated simultaneously or near- simultaneously using a slide coating, multilayer die-coating, or die/slide combination coating.
  • the adhesive layers can be coated using a multi-layer die such as that described in U.S. Patent No. 5,993,961, the disclosure of which is incorporated by reference herein in its entirety.
  • the adhesive construction can be coated onto a release liner.
  • Any release liner suitable for the chosen adhesive may be used.
  • release liners may be coated papers or films, and super calendared paper, for example.
  • Coating materials suitable for release liners include, for example, silicone-based and fluorine-based materials, or any other material that has the desired releasing properties, for example, waxes and carbamates.
  • the release liner can include a suitable release coating on one or both sides so as to allow the adhesive to be wound upon itself during storage.
  • the present adhesives with the upper soft adhesive layer, a firm adhesive layer adjacent the upper soft layer, and optionally another, lower soft adhesive layer adjacent the firm adhesive layer exhibits excellent properties.
  • the adhesives exhibit excellent adhesion but have a sufficient strength such that the adhesives are reworkable without tearing or stretching.
  • the strength of the adhesive also provides the adhesives with excellent handling properties and allows for them to be die cut (as compared to conventional soft adhesives).
  • the soft adhesive outer layer provides an adhesive that exhibits sufficient flow such that the adhesive can accommodate non-planar surfaces without any significant gaps or air pockets forming between the non-planar surface and the adhesive.
  • the multilayered adhesives can be used to adhere one substrate to another and are particularly suitable to adhere an optically clear substrate to another substrate.
  • the adhesive can be attached to any suitable substrate.
  • the adhesive can be attached to a backing layer or facestock material.
  • the backing layer can be chosen from a polymeric material such as a polyolefinic facestock, vinyl facestock, a polyester facestock, a polyurethane facestock, etc.
  • suitable facestock materials include, but are not limited to, polyethylene, polypropylene, polybutylene, polymers of ethylene-propylene diene monomers, polyurethane foams, etc.
  • the adhesive can be used to form a tape like construction with a suitable backing.
  • the adhesives can be used to adhere a first substrate to a second substrate, where the first substrate is panel or film.
  • the adhesives are particularly suitable for adhering a panel suitable as screen or display in an electronic device to a body of an electronic device.
  • Suitable materials for the screen include acrylic or glass based substrates.
  • the panel or screen can be a display panel, a liquid crystal display, a touch panel, a window, a mirror, a lens, etc.
  • the substrate layer may provide flexibility, optical transmission, mechanical strength, and anti-glare functions.
  • the adhesive articles of the invention can be used with a wide variety of display overlays.
  • display overlays include flexible overlays (e.g., thin films made of a suitable plastic material) and rigid overlays (e.g., panels made of glass or a suitable plastic material).
  • the display overlay can be unframed or can be equipped with a frame or other bezel.
  • Representative display overlays include microlouvered privacy filters, antireflection films, polarizing films, diffusers, colored filters, electromagnetic shields, scratch or smudge resistant films, low surface energy films and touch-sensitive panels.
  • the adhesive articles and display overlays can be used on a wide variety of information displays including, but not limited to, multi-character and especially multi-line displays such as LCDs, plasma displays, electroluminescent displays, front and rear projection displays, cathode ray tubes ("CRTs") and signage.
  • the adhesive articles and display overlays of the invention can also be used on single-pixel or binary displays such as individual light emitting diodes ("LEDs”), signal lamps and switches.
  • the adhesive articles and display overlays can be used on illuminated or non-illuminated displays.
  • the invention has particular utility for displays whose information display area is in the form of a viewing screen having a viewing surface that is susceptible to damage during normal use.
  • the adhesives can be used in a variety of portable and non-portable information display devices including notebook computer displays, computer monitors, personal digital assistants ("PDAs"), cell phones (including combination PDA/cell phones), touch-sensitive screens, wrist watches, car navigation systems, global positioning systems, depth finders, calculators, electronic books, CD or DVD players, televisions (e.g., projection televisions), instrument gauges, instrument panel covers, signage such as graphic displays (including indoor and outdoor graphics, bumper stickers, and the like), and reflective sheeting.
  • PDAs personal digital assistants
  • cell phones including combination PDA/cell phones
  • touch-sensitive screens wrist watches
  • car navigation systems global positioning systems
  • depth finders calculators
  • electronic books CD or DVD players
  • televisions e.g., projection televisions
  • instrument gauges e.g., instrument panel covers
  • signage such as graphic displays (including indoor and outdoor graphics, bumper stickers, and the like)
  • reflective sheeting e.g., a reflective sheeting.
  • These information display devices can have planar viewing faces or
  • the invention thus may facilitate installation, removal, or replacement of display overlays on a display.
  • the adhesives with the upper soft adhesive layer, a firm adhesive layer adjacent the upper soft layer, and optionally a second, lower soft adhesive layer adjacent the firm adhesive layer exhibits excellent properties.
  • the adhesives are reworkable and can be repositioned without the adhesive tearing or stretching, which can reduce the number of articles that have to be discarded.
  • the present adhesives are also particularly suitable for applications where one substrate is substantially non-planar.
  • a display panel can contain a bezel around a portion of the display panel substrate.
  • the present adhesives having an upper, soft adhesive layer allow for wetting out around the bezel area such that the soft adhesive layer sufficiently adheres to the panel without generating any gaps or bubbles between the substrate and the adhesive.
  • an article 300 comprises a substrate 310 (such as, for example, a display panel or clear substrate) and an adhesive 330 to be adhered to the substrate.
  • the substrate 310 includes a bezel 320 around the periphery of the substrate.
  • the bezel 320 can be a layer of ink or some other material as desired for a particular purpose or intended use.
  • the adhesive 330 comprise a multi- layered adhesive in accordance with aspects of the present invention, and is provided such that a soft adhesive layer will contact the underlying surface of the substrate 310 and the bezel area 320.
  • FIG. 4 illustrates an embodiment of a two-layer adhesive article.
  • Article 300' has two-layer adhesive 100 adhered to a panel 310 having a bezel 320.
  • the adhesive 100 includes the soft adhesive layer 110 and the firm adhesive layer 120.
  • the soft adhesive layer 110 is adhered to the under surface of the substrate 310 and the bezel 320.
  • the firm adhesive layer 120 can then be adhered to another substrate to attach the substrate 310 to a substrate of interest.
  • FIG. 5 illustrates an embodiment of a three-layer adhesive article.
  • Article 300" has three-layer adhesive 200 adhered to a panel 310 having a bezel 320.
  • the adhesive 200 includes the soft adhesive layer 210, soft adhesive layer 220, and the firm adhesive layer 230.
  • the adhesive layer 210 is adhered to the under surface of the substrate 310 and the bezel 320.
  • the soft adhesive layer 220 can then be adhered to another substrate to attach the substrate 310 to a substrate of interest.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

La présente invention concerne un adhésif multicouche. L'adhésif peut comprendre deux ou trois couches. Un adhésif à deux couches comprend une couche adhésive souple et une couche adhésive ferme adjacente à la couche adhésive souple. Un adhésif à trois couches comprend une première couche adhésive molle, une seconde couche adhésive molle, et une couche adhésive ferme disposée entre la première et la seconde couche adhésives souples. L'adhésif peut être un adhésif optiquement transparent. La configuration des couches adhésives leur confère un degré de souplesse et de résistance élevé. Des adhésifs multicouche optiquement transparents peuvent être utilisés avec des écrans électroniques, des pavés tactiles, des miroirs et d'autres applications électroniques.
PCT/US2014/017045 2013-02-22 2014-02-19 Adhésifs multicouche optiquement transparents, mousses, bandes de transfert et articles comprenant ces adhésifs Ceased WO2014130507A1 (fr)

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WO2016171939A1 (fr) * 2015-04-21 2016-10-27 3M Innovative Properties Company Utilisation d'adhésifs optiquement transparents comme peaux pour administrer des adhésifs liquides thermofusibles fluides optiquement transparents
CN107011815A (zh) * 2017-05-09 2017-08-04 东莞市纳利光学材料有限公司 一种oca光学胶及其制备方法
CN107033794A (zh) * 2017-05-02 2017-08-11 东莞市纳利光学材料有限公司 一种oca光学胶及其制备方法
US10640689B2 (en) 2015-06-03 2020-05-05 3M Innovative Properties Company Acrylic-based flexible assembly layer
WO2020112824A3 (fr) * 2018-11-27 2020-08-06 Avery Dennison Corporation Constructions de bande multicouche pour l'amortissement des vibrations à basse température avec adhérence modulable
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WO2021112857A1 (fr) * 2019-12-05 2021-06-10 Hewlett-Packard Development Company, L.P. Compositions adhésives optiquement transparentes réutilisables
US11118088B2 (en) 2017-12-21 2021-09-14 3M Innovative Properties Company Adhesive articles including a cushion layer and a continuous shell layer
US11753687B2 (en) 2008-05-14 2023-09-12 Dermtech, Inc. Diagnosis of melanoma and solar lentigo by nucleic acid analysis
US11826779B2 (en) 2019-12-31 2023-11-28 3M Innovative Properties Company Multilayer articles via wet-on-wet processing
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KR101923941B1 (ko) 2014-09-11 2019-02-25 주식회사 엘지화학 광학용 점착 시트
KR20160031093A (ko) * 2014-09-11 2016-03-22 (주)엘지하우시스 광학용 점착 시트
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US10125500B2 (en) * 2015-01-26 2018-11-13 Terry Sisler Protective and decorative deck covering
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US10640689B2 (en) 2015-06-03 2020-05-05 3M Innovative Properties Company Acrylic-based flexible assembly layer
US10752810B2 (en) 2015-06-03 2020-08-25 3M Innovative Properties Company Assembly layer for flexible display
US11332642B2 (en) 2015-06-03 2022-05-17 3M Innovative Properties Company Assembly layer for flexible display
CN107033794A (zh) * 2017-05-02 2017-08-11 东莞市纳利光学材料有限公司 一种oca光学胶及其制备方法
CN107011815A (zh) * 2017-05-09 2017-08-04 东莞市纳利光学材料有限公司 一种oca光学胶及其制备方法
CN107011815B (zh) * 2017-05-09 2020-05-05 东莞市纳利光学材料有限公司 一种oca光学胶及其制备方法
US11118088B2 (en) 2017-12-21 2021-09-14 3M Innovative Properties Company Adhesive articles including a cushion layer and a continuous shell layer
US11976332B2 (en) 2018-02-14 2024-05-07 Dermtech, Inc. Gene classifiers and uses thereof in non-melanoma skin cancers
WO2020112824A3 (fr) * 2018-11-27 2020-08-06 Avery Dennison Corporation Constructions de bande multicouche pour l'amortissement des vibrations à basse température avec adhérence modulable
US12071570B2 (en) 2018-11-27 2024-08-27 Avery Dennison Corporation Multilayer tape constructions for low-temperature vibration damping with tunable adhesion
US20210031491A1 (en) * 2019-07-31 2021-02-04 Boe Technology Group Co., Ltd. Display device and optically clear adhesive
US11590732B2 (en) * 2019-07-31 2023-02-28 Boe Technology Group Co., Ltd. Display device and optically clear adhesive
WO2021112857A1 (fr) * 2019-12-05 2021-06-10 Hewlett-Packard Development Company, L.P. Compositions adhésives optiquement transparentes réutilisables
US11826779B2 (en) 2019-12-31 2023-11-28 3M Innovative Properties Company Multilayer articles via wet-on-wet processing

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