WO2018085395A1 - Optically clear barrier tapes - Google Patents

Optically clear barrier tapes Download PDF

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Publication number
WO2018085395A1
WO2018085395A1 PCT/US2017/059526 US2017059526W WO2018085395A1 WO 2018085395 A1 WO2018085395 A1 WO 2018085395A1 US 2017059526 W US2017059526 W US 2017059526W WO 2018085395 A1 WO2018085395 A1 WO 2018085395A1
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WO
WIPO (PCT)
Prior art keywords
adhesive
tape
adhesive layer
double sided
less
Prior art date
Application number
PCT/US2017/059526
Other languages
French (fr)
Inventor
Susan M. RHODES
Elissei Iagodkine
Mahesh GANESAN
Chan U. Ko
Marcela CASTANO
Original Assignee
Avery Dennison Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US201662415551P priority Critical
Priority to US62/415,551 priority
Priority to US201762470800P priority
Priority to US62/470,800 priority
Application filed by Avery Dennison Corporation filed Critical Avery Dennison Corporation
Publication of WO2018085395A1 publication Critical patent/WO2018085395A1/en

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/10Adhesives in the form of films or foils without carriers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered 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
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/30Adhesives in the form of films or foils characterised by the adhesive composition
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUSE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
    • C08K5/00Use of organic ingredients
    • C08K5/04Oxygen-containing compounds
    • C08K5/07Aldehydes; Ketones
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUSE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
    • C08K5/00Use of organic ingredients
    • C08K5/16Nitrogen-containing compounds
    • C08K5/34Heterocyclic compounds having nitrogen in the ring
    • C08K5/3412Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
    • C08K5/3432Six-membered rings
    • C08K5/3435Piperidines
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUSE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
    • C08K5/00Use of organic ingredients
    • C08K5/16Nitrogen-containing compounds
    • C08K5/34Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
    • C08K5/3472Five-membered rings
    • C08K5/3475Five-membered rings condensed with carbocyclic rings
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUSE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
    • C08K5/00Use of organic ingredients
    • C08K5/16Nitrogen-containing compounds
    • C08K5/34Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
    • C08K5/3477Six-membered rings
    • C08K5/3492Triazines
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00Adhesives based on unspecified macromolecular compounds
    • C09J201/02Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C09J2201/12Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups by the arrangement of layers
    • C09J2201/128Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00Adhesives based on unspecified macromolecular compounds
    • C09J201/02Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C09J2201/60Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups by other properties
    • C09J2201/622Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups by other properties the parameters being the characterising features
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00Applications
    • C09J2203/30Use of the adhesive tape
    • C09J2203/318Use of the adhesive tape for the production of liquid crystal displays
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2205/00Other features
    • C09J2205/10Other features of adhesive tapes; Production process thereof
    • C09J2205/102Other features of adhesive tapes; Production process thereof additives as essential feature of the adhesive layer, the additive itself being indicated with the corresponding code of C08K
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00Presence of polyolefin
    • C09J2423/006Presence of polyolefin in the substrate
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00Presence of (meth)acrylic polymer
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2483/00Presence of polysiloxane

Abstract

One or more techniques and/or systems are disclosed for optically clear barrier tapes. The optically clear barrier tape assembly may be disposed on surface of a member. In one implementation, the optically clear barrier tape may comprise a transfer tape. In another implementation, the optically clear barrier tape may comprise a double sided adhesive tape.

Description

OPTICALLY CLEAR BARRIER TAPES

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to U.S. Provisional Application No. 62/415,551, filed

November 1, 2016 and U.S. Provisional Application No. 62/470,800, filed March 13, 2017.

BACKGROUND

[0002] Adhesive tapes may be used in the assembly of electronic goods and the like. The electronic goods may include but are not limited to electronic members such as portable electronic devices, transparent displays, and flexible electronics. Such adhesive tapes may be used to secure and/or retain components of the assembly to each other or to other substrates. In some applications, the adhesive tapes may be pressure sensitive. In certain applications, the adhesive tapes may be double sided adhesive tapes and contain two adhesive layers on oppositely directed faces of a gas barrier layer, and may be also referred to as double coated tapes. In other applications, the adhesive tapes may be an adhesive film or adhesive layer with at least one release liner, and may also be referred to as adhesive transfer tapes.

[0003] Barrier tapes may be relatively thick and not desired for use in electronic assemblies, including smaller and/or thinner applications. In many applications, thinner adhesive tapes may be provided since they may exhibit enhanced flexibility and other desired properties. However, the thinner adhesive tapes may sacrifice other characteristics such as optical clarity and/or gas or moisture barrier properties.

SUMMARY

[0004] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description of the Embodiments. This Summary is not intended to identify essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

[0005] As provided herein, an optically clear barrier tape may comprise a double sided adhesive tape or an adhesive transfer tape. As used in all embodiments herein, the term "optically clear" refers to the clarity of a tape or adhesive as measured by total light transmittance and haze value. Additionally, in one implementation, the optically clear barrier tape may be provided as an assembly and disposed onto a member. In another implementation, a method for producing the optically clear barrier tape may be provided herein.

[0006] In one implementation, a double sided adhesive tape may comprise: 1) an optically clear gas barrier layer comprising a first face and a second face opposite the first face; 2) a first adhesive layer disposed on the first face; and 3) a second adhesive layer disposed on the second face, the double sided adhesive tape having: a) a total light transmittance of at least about 85% within the visible spectrum (described herein where the wavelength is between about 400 nm to about 800 nm); b) a haze value of about 3% or less; c) a water vapor transmission rate (WVTR) of about 35 g/m2/day or less at about 45 °C/100% RH; and d) a thickness of the double sided adhesive tape of about 100 microns or less. Further, in one implementation, the double sided adhesive tape may maintain its properties after heat aging (as described herein). Further, in one implementation, the double sided adhesive tape may comprise a release liner on at least one of the first adhesive layer and the second adhesive layer. In another implementation, the double sided adhesive tape may comprise a release liner on each of the first adhesive layer and the second adhesive layer. Additionally, in one implementation, the member assembly comprising at least one adhesive in the double sided adhesive tape may exhibit corrosion resistance or low corrosion. As used herein, corrosion resistance or low corrosion may also be described as "slight to none" for in the corrosion testing provided herein. The corrosion resistance may be to metal surfaces. In another implementation, the double sided adhesive tape may be highly flexible, bendable, and conformable (as described herein using the Bendability Test where the double sided adhesive tape is visually checked for cracking, change in haze, and other defects from testing). In yet another implementation, at least one of the first adhesive layer and the second adhesive layer may comprise a pressure sensitive adhesive. In another implementation, at least one of the first adhesive layer and the second adhesive layer may comprise an acrylic adhesive. In one implementation, at least one of the first adhesive layer and the second adhesive layer may comprise a silicone based adhesive. In some implementations, the silicone based adhesive may be addition curable (also referred to herein as addition cured, addition cure, or platinum cured) silicone based adhesive. In another implementation, at least one of the first adhesive layer and the second adhesive layer may comprise at least one corrosion resistance additive. In some implementations, the corrosion resistance additive may comprise benzophenone, triazine, benzotriazole, and/or hindered amine light stabilizers. In one implementation, the optically clear gas barrier layer may comprise a single layer film. In another implementation, the optically clear gas barrier layer may comprise a multi-layer film. Described herein is also a method for producing the double sided adhesive tape and a member assembly.

[0007] In one implementation, the adhesive transfer tape may comprise: 1) an adhesive layer comprising a first face and a second face opposite the first face; and 2) at least one release liner disposed on at least one of the first face and the second face of the adhesive layer, the adhesive transfer tape having: a) a total light transmittance of at least about 85% within the visible spectrum; b) a haze value of about 3% or less; c) a water vapor transmission rate (WVTR) of about 500 g/m2/day or less at about 45° C/ 100% RH; and d) a thickness of the adhesive transfer tape about 25 microns or less. Further, in one implementation, the adhesive transfer tape may maintain its properties after heat aging. Additionally, in one implementation, the member assembly comprising the adhesive transfer tape may exhibit corrosion resistance or low corrosion. In another implementation, the adhesive transfer tape may be highly flexible, bendable, and conformable (as described herein using the Bendability Test where the adhesive transfer tape is visually checked for cracking, change in haze, and other defects from testing). In yet another implementation, the adhesive transfer tape may comprise a pressure sensitive adhesive. In another implementation, the adhesive transfer tape may comprise an acrylic adhesive. In one implementation, the adhesive transfer tape may comprise a silicone based adhesive. In some implementations, the silicone based adhesive may be addition curable silicone based adhesive. In another implementation, the adhesive transfer tape may comprise at least one corrosion resistance additive (further described below). In some implementations, the corrosion resistance additive may comprise benzophenone, triazine, benzotriazole, and/or hindered amine light stabilizers. Described herein is also a method for producing the adhesive transfer tape and a member assembly.

[0008] Also described herein is an adhesive layer comprising at least one adhesive having: a total light transmittance of at least about 85% within the visible spectrum; a haze value of about 3% or less; a water vapor transmission rate (WVTR) of about 500 g/m2/day or less at about 45 °C/100% RH; and a thickness of the adhesive of about 100 microns or less. In another implementation, the adhesive layer may comprise at least one corrosion resistance additive (further described below). In some implementations, the corrosion resistance additive may comprise benzophenone, triazine, benzotriazole, and/or hindered amine light stabilizers. The adhesive may comprise at least one adhesive of acrylic based adhesives, rubber based adhesives, polyester based adhesives, polyurethane based adhesives, silicone based adhesives, and hybrid adhesives. In some implementations, the adhesive layer may be pressure sensitive. In other implementations, at least one of the first adhesive layer and the second adhesive layer may be an addition curable silicone adhesive. In other implementations, the adhesive layer may be polyisobutylene (PIB) where the PIB is at least part of a butyl-based adhesive. In some implementations, the PIB may be functionalized. [0009] To the accomplishment of the foregoing and related ends, the following description and drawings set forth certain illustrative aspects and implementations. These are indicative of but a few of the various ways in which one or more aspects may be employed. Other aspects, advantages and novel features of the disclosure will become apparent from the following detailed description when considered in conjunction with the drawings.

[0010] The following description and drawings set forth certain implementations and embodiments. The disclosure may provide several aspects and novel features, and the will become evident from the description when considered with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] What is disclosed herein may be described in detail in this specification and provided in certain embodiments illustrated in the accompanying drawings, in which:

[0012] Figure 1 is a schematic cross sectional view of an embodiment of the adhesive tape of the present subject matter.

[0013] Figure 2 is a schematic cross sectional view of an embodiment of the adhesive tape of the present subject matter.

[0014] Figure 3 is a schematic cross sectional view of an embodiment of a component and adhesive tape adhered thereto in accordance with the present subject matter.

[0015] Figure 4 is a schematic cross sectional view of the component of Figure 3 adhered to a substrate, using an embodiment of the adhesive tape in accordance with the present subject matter.

[0016] Figure 5 is a schematic cross sectional view of an embodiment of the adhesive tape of the present subject matter.

[0017] Figure 6 is a schematic cross sectional view of an embodiment of the component and adhesive tape adhered thereto in accordance with the present subject matter.

[0018] Figure 7 is a schematic cross sectional view of the component of Figure 6 adhered to the substrate, using an embodiment of the adhesive tape in accordance with the present subject matter.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The claimed subject matter is now described with reference to the drawings, wherein the reference numerals in the drawings are generally used to refer to like elements throughout the description. Certain specific details may be set forth within the description in order to provide a thorough understanding of the claimed subject matter. However, the claimed subject matter may be practiced without these certain specific details. Structures within the drawings may describe the claimed subject matter with respect to certain embodiments but are not for purposes of limiting the same. Specific characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.

[0020] As provided herein, a barrier tape that may be optically clear and provide gas barrier capability is disclosed. The optically clear barrier tape may comprise a double sided adhesive tape. Alternatively, optically clear barrier tape may comprise an adhesive transfer tape. Additionally, the optically clear barrier tape may be provided as an assembly and disposed onto a member. In another implementation, a method for producing the optically clear barrier tape and a member assembly may be provided herein. Also provided herein is an adhesive layer to be used in an optically clear barrier tape.

DOUBLE SIDED ADHESIVE TAPES

[0021] As provided herein, a double sided adhesive tape may comprise: 1) an optically clear gas barrier layer comprising a first face and a second face opposite the first face; 2) a first adhesive layer disposed on the first face; and 3) a second adhesive layer disposed on the second face, the double sided adhesive tape having: a) a total light transmittance of at least about 85% within the visible spectrum; b) a haze value of about 3% or less; c) a water vapor transmission rate (WVTR) of about 35 g/m2/day or less at about 45 °C/100% RH; and d) a thickness of the double sided adhesive tape of about 100 microns or less.

[0022] In many implementations, the double sided adhesive tape may comprise a gas barrier layer, as further described below. In many implementations, the gas barrier layer may be optically clear, as further described below. In many implementations, the double sided adhesive tape may comprise the first adhesive layer and the second adhesive layer, as further described below. As described herein, the disclosed double sided adhesive tape may exhibit certain characteristics.

[0023] In many implementations, the double sided adhesive tape described herein may have a total light transmittance of at least about 85% within the visible spectrum. In one implementation, the double sided adhesive tape may have a total light transmittance of at least about 90%. The total light transmittance may describe a total light transmittance in the range of the visible spectrum, which may be within a wavelength range of about 400 nm to about 780 nm. In many implementations, the total light transmittance may be measured, for example by ASTM El 348. In one implementation, the double sided adhesive tape may optionally have a light transmittance of about 5% or less at about 380 nm wavelength. In another implementation, the double sided adhesive tape may optionally have a light transmittance of about 1 % or less at about 380 nm wavelength. For the lower light transmittance in the lower wavelengths of the visible spectrum and wavelengths into the UV spectrum, which may also be referred to as the ultraviolet ray (UV) cutting property, the light transmittance may be altered by at least one of the adhesive compositions and/or the barrier layer.

[0024] In one implementation, the tape described herein may provide an optically clear tape. In one implementation, the term "optically clear" double sided adhesive may describe a tape that has a haze value of about 3% or less. In another implementation, the term "optically clear" may describe a double sided adhesive tape that has a haze value of about 1% or less. In yet another implementation, the term "optically clear" may describe a double sided adhesive tape that has a haze value of about 0.5% or less. In many implementations, the haze value may be measured, for example, by ASTM D1003. In another implementation, the haze value may be measured by BS EN ISO 13468 Parts 1 and 2. Additionally, in one implementation, the optical clarity of the double sided adhesive tape may be within about 10% or less of the original haze value after heat aging, regardless of adhesive chemistry. In another implementation, the optical clarity of the double sided adhesive tape may be within about 5% or less of the original haze value after heat aging, regardless of adhesive chemistry. In some implementations, the difference in the haze value after aging may be higher than 10% as long as the haze value remains less than about 1%. In some implementations, heat aging may describe conditions where the double sided adhesive tape is subjected to about 500 hours at about 65 °C and about 90% relative humidity. In other implementations, heat aging may include heating to elevated temperatures (e.g., about 60 to about 90° C), optionally, under elevated humidity conditions (e.g., about 80 to about 90 percent relative humidity), for a period of time (e.g., 1 day to 1 month), followed by a rapid cool down to ambient condition (e.g. cooling to room temperature within minutes after exposure to the elevated heat and elevated humidity).

[0025] In some implementations, the double sided adhesive tape described herein may have a high refractive index or matched refractive index to the application member. In one implementation, the double sided adhesive tape may have a refractive index of about 1.25 to about 1.80. In another implementation, the double sided adhesive tape may have a refractive index of about 1.40 to about 1.60. The values for the refractive index may be relatively similar after heat aging. The refractive index may be measured by ASTM D542 at 25 ° C.

[0026] In some implementations, the double sided adhesive tape described herein may have a water vapor transmission rate (WVTR) of about 35 g/m2/day or less when measured at about 45° C and about 100% relative humidity, regardless of adhesive chemistry. In one implementation, the double sided adhesive tape may have a water vapor transmission rate (WVTR) of about 3 g/m2/day or less when measured at about 45° C and about 100% relative humidity, regardless of adhesive chemistry. In one implementation, the double sided adhesive tape may have a water vapor transmission rate (WVTR) of about 0.3 g/m2/day or less when measured at about 45° C and about 100% relative humidity, regardless of adhesive chemistry. In one implementation, the double sided adhesive tape may have a water vapor transmission rate (WVTR) of about 8x10 2 g/m2/day or less when measured at about 45° C and about 100% relative humidity, regardless of adhesive chemistry. The WVTR of the double sided adhesive tape may also remain relatively unaffected by hybrid adhesive chemistries. In some implementations, the WVTR may be measured, for example, by ASTM F1249 or ASTM E96. WVTR, as known in the art, may be affected by the thickness of the assembly.

[0027] The thickness measurements of the optically clear double sided adhesive tape may include the first adhesive layer, the second adhesive layer, and the gas barrier layer. In many implementations, the double sided adhesive tape described herein may have a total thickness of about 100 microns or less. In one implementation, the double sided adhesive tape may have a total thickness of about 40 microns or less. In one implementation, the double sided adhesive tape may have a total thickness of about 30 microns or less. In one implementation, the double sided adhesive tape may have a total thickness of about 25 microns or less. However, in some instances (not provided), the thickness measurements of the optically clear double sided adhesive tape may not include the optional release liners for the double sided adhesive tapes described herein.

[0028] In one implementation, the double sided adhesive tape may comprise additives that affect the WVTR in at least one of the adhesive layers. The additives that may affect the WVTR may provide relatively minimal changes in optical properties. In some implementations, the additives that may affect the WVTR may comprise nanoparticles. In some implementations, the nanoparticles may comprise a metal oxide. In one implementation, the nanoparticles may comprise titanium dioxide nanoparticles. In another implementation, the nanoparticles may comprise zinc oxide nanoparticles. In another implementation, the nanoparticles may comprise aluminum oxide nanoparticles. In one implementation, at least one adhesive layer may comprise about 1% to about 70% by weight nanoparticles. In another implementation, at least one adhesive layer may comprise about 5% to about 70% by weight nanoparticles. In one implementation, at least one adhesive layer may comprise about 10% to about 60% by weight nanoparticles. In another implementation, at least one adhesive layer may comprise about 30% to about 60% by weight nanoparticles. The nanoparticles can be various sizes. In one implementation, the nanoparticle may have a mean diameter of about 3 nanometers to about 100 nanometers. In another implementation, the nanoparticle may have a mean diameter of about 5 nanometers to about 75 nanometers. In one implementation, the nanoparticle may have a mean diameter of about 5 nanometers to about 50 nanometers. In another implementation, the nanoparticle may have a mean diameter of about 5 nanometers to 30 nanometers. In some embodiments, the nanoparticles may be surface modified. Surface-modifying agents may include, but are not limited to, silanes (including organosilanes), organic acids organic bases, and alcohols. Further, at least one adhesive of the double sided adhesive tape may comprise fillers which can interact with oxygen and/or water vapor, chemically or physically bound to said fillers. Such fillers may also referred to as "getter," "scavenger," "desiccant," or "absorber," and may comprise but are not limited to oxidizable metals, halides, salts, silicates, oxides, hydroxides, sulphates, sulphites, carbonates of metals and transition metals, perchlorates and activated carbon, including its modifications. Additional examples may also include cobalt chloride, calcium chloride, calcium bromide, lithium chloride, zinc chloride, zinc bromide, silicon dioxide (silica gel) aluminium oxide (activated aluminium), calcium phosphate, copper sulphate, sodium dithionite, sodium carbonate, magnesium carbonate, titanium dioxide, bentonite, montmorillonite, diatomaceous earth, zeolites and oxides of alkali or alkaline earth metals such as barium oxide, calcium oxide, iron oxide, magnesium oxide, and carbon nanotubes.

[0029] Additionally, in some implementations, the member assembly comprising at least one adhesive of the double sided adhesive tape may exhibit corrosion resistance or low corrosion. Alternatively, in some implementations, the double sided adhesive tape exhibits corrosion resistance or low corrosion. The corrosion resistance may be to metal surfaces. In one implementation, the double sided adhesive tape exhibits corrosion resistance or low corrosion to metallic surfaces after aging the member assembly for about 500 hours at about 65° C temperature and about 90% relative humidity.

[0030] In some implementations, at least one adhesive of the double sided adhesive tape may exhibit low corrosion. In some implementations, at least one adhesive of the double sided adhesive tape may exhibit low resistivity. As used herein, resistivity (also known as electrical resistivity) is a measure of a material's ability to oppose the flow of electric current, which may be provided in ohm-meter (Ω-m). In other implementations, the dielectric constant may also be measured, for example, by ASTM D150, frequencies 1 KHz- 1 MHz. In one implementation, the dielectric constant for the double sided adhesive tape described herein may be about 2 to about 6, even after heat aging. In another implementation, the dielectric constant for the double sided adhesive tape may be about 2.5 to about 3.5, even after heat aging. In some implementations, the variation of dielectric constant measured is within about 10%.

[0031] In many implementations, at least one adhesive of the double sided adhesive tape may exhibit low corrosion to metallic surfaces, including but not limited to metals, metal oxides, and metal alloys. In some implementations, representative metallic surfaces may include aluminum, chromium, copper, nickel, silver, silver paste, tin, titanium, zirconium, copper oxide, indium oxide, indium tin oxide, indium zinc oxide, nickel oxide, antimony-doped tin oxide, titanium oxide, zinc oxide, zirconium oxide, aluminum alloy, copper-nickel alloy, copper-zirconium alloy, copper-nickel-titanium alloy, tin-silver alloy, and mixtures thereof. In some implementations, the member assembly comprising at least one adhesive of the double sided adhesive tape may exhibit corrosion resistance or low corrosion to other surfaces including but not limited to lighting sources. As described herein, lighting sources describe sources of light where the double sided adhesive tape, adhesive transfer tape, and adhesive layer described in the embodiments herein are disposed on a member and/or surface that comprises a source of light in the application. In some embodiments, the lighting sources may be OLED encapsulation.

[0032] In some implementations, the member assembly comprising the double sided adhesive tape may exhibit corrosion resistance or low corrosion when certain additives may be used in the first adhesive layer. In some implementations, the member assembly comprising the double sided adhesive tape may exhibit corrosion resistance or low corrosion when certain additives may be used in the second adhesive layer. In some implementations, such additives that may provide corrosion resistance may include, but are not limited to, compounds with nitrogen, phosphorus, oxygen, and sulfur. In one implementation, at least one of the adhesive layers may comprise silicone where the corrosion additives may comprise about 0.1% to about 1.0% by weight of the adhesive composition. In one implementation, at least one of the adhesive layers may comprise other chemistries besides silicone where the corrosion additives may comprise about 0.1% to about 10% by weight of the adhesive composition.

[0033] In another implementation, at least one adhesive layer of the double sided adhesive tape may comprise at least one corrosion resistance additive, which may or may not also be a UV cutting agent. In one implementation, the corrosion resistance additive may comprise at least one of benzophenones (A), benzotriazoles (B), triazines (C), oxanilides (D), crown ethers, porphyrins, phthalocyanines, pyrimidines, HALS (described below), or combinations thereof. In some implementations, the corrosion resistance additives may comprise rings containing heteroatoms. In some implementations, the corrosion resistance additives may comprise tertiary amines. Some corrosion resistance additives may include, but are not limited to:

Figure imgf000012_0001

A

Figure imgf000012_0002

C

Figure imgf000012_0003

D

[0034] In some implementations, at least one adhesive of the double sided adhesive tape may comprise hindered amine lights stabilizers (HALS). HALS may be radical scavengers and stabilizers. In some embodiments, the HALS may be an additive in the double sided adhesive tape, transfer tape, and/or adhesive described herein. In some embodiments, the HALS may be a corrosion resistance additive in the double sided adhesive tape, transfer tape, and/or adhesive described herein. HALS may be oligomeric and contain triazines in their structure. Examples of the hindered amine -based light stabilizer may include, but are not limited to, a polymerized product of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-l- piperidine ethanol (trade name "TINUVIN 622", manufactured by BASF), a reaction product of a polymerized product of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-l-piperidine ethanol with N,N N' N'"-tetra]ds-(4,6-bis-(butyl-(N-methyl-2,2,6,6-tetramethylpiperidine-4-yl)amino)-triazin-2-yl^ 4,7-diazadecane-l,10-diamine (weight ratio thereof is 1 : 1) (trade name "TINUVIN 119", manufactured by BASF), a polycondensation product of dibutylamine.1 ,3-triazine.N,N'-bis(2,2,6,6-tetramethyl- 4-piperidyl- 1 ,6-hexamethylenediamine and N-(2,2,6,6-tetramethyl-4-piperidyl)butylamine ((trade name "TINUVIN 2020", manufactured by BASF), poly[{6-(l,l,3,3-tetramethylbutyl) amino-l,3,5-triazin-2,4-diyl} {2,2,6,6- tetramethyl-4-piperidyl}imino]hexamethylene{(2,6,6-tetramethyl-4-piperidyl)imino}) ((trade name "TINUVIN 944", manufactured by BASF), a mixture of bis(l,2,2,6,6-pentamethyl-4-piperidyl)sebacate and methyl- 1, 2,2,6, 6-pentamethyl-4-piperidyl sebacate (trade name "TINUVIN 765", manufactured by BASF), bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate (trade name "TINUVIN 770", manufactured by BASF), a reaction product of decanedioic acid bis(2,2,6,6-tetramethyl-l-(octyloxy)-4- piperidinyl)ester(l,l-dimethylethylhydroperoxide) and octane (trade name "TINUVIN 123", manufactured by BASF), bis(l,2,2,6,6-pentamethyl-4-piperidyl)[[3,5-bis (l,l-dimethylethyl)-4- hydroxyphenyl] methyl] butylmalonate (trade name "TINUVIN 144", manufactured by BASF), a reaction product of 2-aminoethanol with a reaction product of cyclohexane and N-butyl-2,2,6,6-tetramethyl-4- piperidineamine-2,4,6-trichloro-l,3,5-triazine peroxide (trade name "TINUVIN 152", manufactured by BASF), a mixture of bis(l,2,2,6,6-pentamethyl-4-piperidyl)sebacate and methyl- l,2,2,6,6-pentamethyl-4- piperidyl sebacate (trade name "TINUVIN 292", manufactured by BASF). The HALS structure may comprise:

Figure imgf000013_0001
tetra-mefchyi-pSperidJne

where R= -H, CF , - O-R' , -O-CO-CH3. In certain embodiments, oxanalides, a type of UV absorber, may be used as corrosion resistant additives and/or UV cutting agents.

[0035] In one implementation, at least one adhesive layer of the double sided adhesive tape may comprise other UV absorbers. Such UV absorbents may include, for example, salicylic acid ester type compounds, benzophenone type compounds, and benzotriazole type compounds. In many implementations, combinations of UV absorbers, corrosion resistance additives, and/or UV cutting agents may be added to the adhesive.

[0036] In another implementation, at least one of the first adhesive layer and the second adhesive layer may comprise at least one corrosion resistance additive. In one implementation, the corrosion resistance additive may include benzophenones. In one implementation, the benzophenone may comprise (2-hydroxy-4-(octyloxy)phenyl)phenyl methanone (illustrated below in Structure I and commercially available as Hostavin AR08 from Clariant). In another implementation, the corrosion resistance additive may include benzotriazoles. In yet another implementation, the corrosion resistance additive may include triazines. In one implementation, the triazine may comprise hydroxyphenyl triazine. In another implementation, the hydroxyphenyl triazine may comprise 2,4-bis[2-hydroxy-4-butoxyphenyl]-6-(2,4- dibutoxyphenyl)-l,3,5-triazine) (illustrated below in Structure II and commercially available as Tinuvin 460 from BASF).

Figure imgf000014_0001

[0037] In some implementations, the addition of at least one corrosion resistance additive in the first adhesive layer and/or the second adhesive layer may be adjusted for compatibility with the adhesive(s). In one implementation, the concentration of the corrosion resistance additive may be adjusted based on solubility. In some implementations, the addition of at least one corrosion resistance additive in the first adhesive layer and/or the second adhesive layer may be adjusted for transparency with the adhesive(s), including transparency in a certain wavelength range. In other implementations, the addition of at least one corrosion resistance additive in the first adhesive layer and/or the second adhesive layer may be adjusted to control light transmission and haze. In one embodiment, a combination of benzotriazole and benzophenone may be added to a silicone based adhesive. In one embodiment using the combination of benzotriazole and benzophenone, less than 1.5% may be used. In one embodiment, a combination of HALS and benzotriazole may be added to an acrylic based adhesive. In another embodiment, a combination of HALS and benzotriazole at about 3% to about 8% may be added to an acrylic based adhesive.

[0038] In some implementations, the member assembly comprising the double sided adhesive tape may exhibit corrosion resistance or low corrosion to various surfaces when visually inspected. In some implementations, the member assembly comprising the double sided adhesive tape may exhibit corrosion resistance or low corrosion when visually inspected after aging for about 500 hours at about 65 °C temperature and about 90% relative humidity.

[0039] In another implementation, the double sided adhesive tape may be highly flexible, bendable, and conformable. In one implementation, the double sided adhesive tape may be bendable at certain angles repeatedly without affecting the optical properties of the double sided adhesive tape. In one implementation, the double sided adhesive tape may be bendable at certain angles repeatedly without cracking the double sided adhesive tape. In one implementation, the double sided adhesive tape may be bendable at certain angles repeatedly without imparting defects in the double sided adhesive tape. In one implementation, the double sided adhesive tape may be conformed around a member and/or substrate, including but not limited to curved and irregular members and substrates. In one implementation, the double sided adhesive tape may be highly flexible, bendable, and conformable where it may be used in OLED, AMOLED, quantum dots, or other flexible electronics applications. Conformability may be measured using an ink step test. In some implementations, the double sided adhesive tape may also be stretchable.

[0040] Additionally, the double sided adhesive tape may exhibit adhesion to a variety of materials such as glass, PMMA, aluminum, PET at both room temperature and elevated temperatures like about 85 °C. In one implementation, the peel adhesion of the double sided adhesive tape may be at least about 0.1 N/mrn. In another implementation, the peel adhesion of the double sided adhesive tape may be at least about 0.3 N/mrn. In one implementation, the peel adhesion of the double sided adhesive tape may be at least about 0.5 N/mrn. In one implementation, the impact tensile may be at least about 35 mJ/cm2. In another implementation, the impact tensile may be at least about 20 mJ/cm2. In one implementation, the impact tensile may be at least about 10 mJ/cm2. Further, in one implementation, the impact shear may be at least about 0.1 J/cm2. In another implementation, the impact shear may be at least about 0.01 J/cm2. In one implementation, the impact shear may be at least about 0.05 J/cm2.

[0041] In many implementations, the first adhesive layer and the second adhesive layer may comprise various adhesive chemistries. In some implementations, the first adhesive layer and the second adhesive layer comprises at least one adhesive of acrylic based adhesives, synthetic rubber based adhesives, polyurethane based adhesives, polyester based adhesives, silicone based adhesives, and hybrid adhesives. In one implementation, the first adhesive layer and the second adhesive layer may comprise the same adhesive chemistry. In one implementation the first adhesive layer and the second adhesive layer may comprise different adhesive chemistries. In some implementations, the first adhesive layer may be of the same composition as the second adhesive layer, or the first adhesive layer and the second adhesive layer may have a different composition. Additionally, in another implementation, at least one adhesive layer of the double sided adhesive tape may comprise hybrid polymers. Hybrid polymers may include, for example, acrylic modified silicone adhesive, organic modified silicone PSA, another hybrid technology, or combinations thereof.

[0042] In one implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise an acrylic based adhesive. Acrylic adhesives are known in the art. The composition of the acrylic adhesive is not limited, but may be chosen for to provide the optical clarity, barrier properties, corrosion resistance, and other properties. In one implementation, the acrylic based adhesive may be a solvent-based adhesive. In one implementation, the acrylic based adhesive may be a solvent-free adhesive. In another implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise rubber based adhesives. In yet another implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise polyurethane based adhesive. In one implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise a hybrid adhesive.

[0043] In one implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise a silicone based adhesive. In one implementation, the silicone based adhesive may be solvent-free. In some implementations, both the first adhesive layer and the second adhesive layers may be silicone based adhesives. In one implementation, the first adhesive layer comprises an acrylic based adhesive and the second adhesive layer comprises a silicone based adhesive. Silicone based PSAs are described in the art, such as US patents 4,584,355; 5,726,256; 5,869,556; 2012/0172543; and European patent 1,957,597, for example.

[0044] One type of silicone based adhesive may be prepared by a bodying reaction between reactive polyorganosiloxane polymers (sometimes referred to as a gum) and reactive polyorganosiloxane resin(s). "Bodying" may refer to reacting a polymer and resin to increase molecular weight, crosslinking, or both. These silicone based adhesives may further be free-radical cross-linked using, for example, a peroxide crosslinker, such as benzoyl peroxide, through hydrogen abstraction and creation of ethylene linkages.

[0045] In another implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise a silicone based gel. In one implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise a silicone based pressure sensitive adhesive (PSA). Another type of silicone based adhesive may be an addition curable silicone based adhesive.

[0046] The addition curable silicone may be prepared using a combination of (i) at least one MQ organopolysiloxane resin, (ii) at least one alkenyl functional polydiorganosiloxane, with in-chain and/or end-chain alkenyl functionality, (iii) at least one organohydrogenpolysiloxane crosslinking agent, and (iv) a suitable curing amount of a hydrosilylation catalyst, such as platinum, iron, or copper where the total amount of components (i) and (ii) being 100 parts by weight. The weight ratio of (i) to (ii) is within a range of from 70:30 to 35:65, or between 65:35 to 40:60. The amount of (iii) may be adjusted to provide the desired performance, and may provide a molar ratio of said SiH groups of component (iii) to said alkenyl groups of component (ii) of at least 1.0.

In some embodiments, the use of addition curable silicone -based adhesive of the present subject matter may also be substantially acid-free (substantially free of acidic components) and/or substantially free of ionic components. Free-radical curable and blends of free -radical curable and addition curable silicone based adhesives may also be used for the present subject matter, provided acidic by-products are minimized through formulation and process controls in order to limit corrosion resistance to metallic surfaces in application. Corrosion resistance to metallic surfaces may be measured visually, for example, after aging for about 500 hours at about 65 °C temperature and about 90% relative humidity. In general, the PSA compositions may include components with a diverse range of structures, molecular weights, reactive functions and viscosities. Inert solvents, silicone fluids, catalysts, fillers, stabilizers, and other additives may also be present.

[0047] The silicone-based adhesive may include dispersions with a repeat formula of R^SiCha or

R'P^SiCha, such as polydimethylsiloxanes, polydimethyl/methylvinyl siloxanes, polydimethyl/methylphenyl siloxanes, polydimethyl/diphenyl siloxanes, and blends thereof and silicone resins, such as MQ resins or blends of resins. Examples of M units in the resin may include but is not limited to Me3SiOi/2, Me2ViSiOi/2, Me2PhSiOi/2, Ph2MeSiOi/2, MeVi2SiOy2, HOMe2SiOy2, (HO)2MeSiOy2, Me2HSiOy2, Me2H2SiOy2, where Me = methyl, OH = hydroxyl, Vi = vinyl, and Ph = phenyl. Q units can be defined as SiC>4/2. R1 or R2 may be any monovalent organic, or hydroxyl group or hydrogen. One skilled in the art would recognize that any polyorganosiloxane resins bodied or dispersed with the polyorganosiloxane polymers mentioned, to give a silicone adhesive with the desired properties, would be fitting with the present subject matter. Non-limiting examples of such compositions which are commercially available include adhesives 7651, 7652, 7657, 2013, Q2-7406, Q2-7566, Q2-7735 and 7956, all available from Dow Chemical (formerly Dow Corning), SilGrip™ PSA 518, 590, 595, 610, 810, 915, 950 and 6574 available from Momentive Performance Materials, and KRT-009 and KRT-026 available from Shin-Etsu Silicone. When applied in an assembly as described herein, the double sided adhesive tape may provide the optical clarity and barrier performance described.

[0048] The silicone based adhesive may additionally include performance modifiers, such as polyorganosiloxane polymers (either reactive or non-reactive) reactive fluids, or resins (either reactive or non-reactive) for glass transition, modulus, adhesion, tack, viscosity or other property modification. Non- limiting examples of such modifiers with are commercially available include Syl-Off® 7075, 2-1912, 2- 7066, 2-7466 all available from Dow Chemical (formerly Dow Corning), SR545 and SR9130 available from Momentive Performance Materials, and KRT-974 available from Shin-Etsu Silicone.

[0049] In many implementations, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise a pressure sensitive adhesive (PSA). Pressure sensitive adhesives (PSAs) are adhesives and thermoplastics which in dry (solvent-free) form are permanently tacky at room temperature. PSAs can adhere to a variety of dissimilar surfaces upon contact without the need for manual pressure and do not require activation by water, solvent, or heat to exert a holding force toward a substrate. The cohesive and elastic nature of PSAs allow for handling and removal from smooth surfaces despite their tackiness without leaving a residue. PSAs can be quantitatively described using the "Dahlquist criteria" which maintains that the elastic modulus of these materials is less than 106 dynes/cm2 at room temperature. See Pocius, A. V., Adhesion & Adhesives: An Introduction, Hanser Publishers, New York, N.Y., First Edition, 1997. In some implementations, pressure sensitive adhesives of the double sided adhesive tape may include at least one PSA of acrylic-based PSA's, synthetic rubber-based PSA's, polyurethane-based PSA's, silicone -based PSA's, and hybrid PSA's.

[0050] In some implementations, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape comprises a substantially acid-free adhesive (substantially free of acidic components) and/or substantially free of ionic components. In another implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape comprises a substantially acid-free adhesive that exhibits corrosion resistance or low corrosion to metallic surfaces, either initially or after exposure to heat and humidity (for example, such as aging at 65° C and 90% relative humidity for 500 hours or another aging method described herein). In some implementations, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape comprises a substantially acid-free adhesive. In some implementations, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape comprises a substantially acid-free acrylic adhesive. In some implementations, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape comprises a substantially acid-free acrylic adhesive. In some implementations, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape comprises a substantially acid-free silicone based adhesive. In some implementations, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape comprises a substantially acid-free silicone based adhesive. In some implementations, both the first adhesive layer and the second adhesive layer of the double sided adhesive tape comprise substantially acid-free silicone based adhesives. In one implementation, the silicone based adhesives comprise no or limited acid by-products. In some implementations, the adhesive layer of the double sided adhesive tape may be substantially free of ionic character.

[0051] In some implementations, the rheology profile for the Storage Modulus and Loss Modulus-

Frequency may include, for example:

Table 1: Storage Modulus and Loss Modulus Versus Frequencies for an Example Acrylic Adhesive (at Room Temperature (RT) 1.5E4 to 1.0E7 Pa, and 80 °C 8.0E3 to 1.0 E6 Pa)

Figure imgf000019_0001

[0052] In one implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may comprise an additive that may provide a desired absorbance property. In another implementation, the adhesive layer of the double sided adhesive tape which may comprise an additive that may absorb at about 9 to about 10 microns. The absorbance additive may provide improved laser cutting capabilities.

[0053] In many implementations, the double sided adhesive tape may comprise a gas barrier layer.

In some implementations, the double sided adhesive tape may comprise a gas barrier layer that may be optically clear. In one implementation, the optically clear gas barrier layer may comprise a single layer film. In another implementation, the optically clear gas barrier layer may comprise a multi-layer film. In some implementations, the gas barrier layer may serve as a carrier for the double sided adhesive tape. In some implementations, the gas barrier layer may be a film with a low WVTR. In some implementations, the gas barrier layer may comprise at least one of cyclic olefin polymers (COP), polyethylene naphthalene (PEN), polychlorotrifluoroethylene (PCTFE), polyethylenefluoroethylene (PETFE), polyvinylidene chloride (PVDC), polytetrafluoroethylene (PTFE), norbornene, polyacrylonitrile, polyisobutylene (PIB), and combinations thereof. In one implementation, PIB of the gas barrier layer is at least part of a butyl- based adhesive. In one implementation, PIB of the gas barrier layer is functionalized. In yet another implementation, the gas barrier layer comprises a treatment or TIE layer comprising polyisobutylene (PIB). For the treatment or TIE layer comprising polyisobutylene (PIB), the PIB may be functionalized.

[0054] In one implementation, the gas barrier layer may optionally comprise an optically clear, gas barrier coating or treatment. In another implementation, the gas barrier coating or treatment may improve the gas barrier properties. In one implementation, the gas barrier layer may comprise a coating or treatment of an atomic layer deposition (ALD) with at least one inorganic compound may be applied to the gas barrier layer. The inorganic compounds may include but are not limited to inorganic oxides such as aluminum oxide or silicon oxide, inorganic nitrides such as silicon nitride and titanium nitride, inorganic carbides, and/or inorganic carbonitrides. In one implementation, at least inorganic compound may be deposited by atomic layer deposition, vacuum deposition, sputtering, ion plating, and/or chemical vapor deposition (thermal-, photo-, or plasma-CVD).

[0055] In one implementation, the gas barrier layer may comprise a coating or treatment based on polyisobutylene. In one implementation, the polyisobutylene may be present as a component in at least one adhesive layer. In one implementation, at least one adhesive layer may be butyl-based adhesive. In one implementation, the polyisobutylene may be present as a copolymer or grafted copolymer. In one implementation, the polyisobutylene may be linear or hyperbranched. Non-limiting examples may include: copolymers of isobutylene and isoprene, polystyrene -polyisobutylene -polyisoprene triblock copolymers, and segmented block copolymers of polyisobutylene and polybutylene terephthalate. In one implementation, polyisobutylene may be functionalized. [0056] In one implementation, functionalized polyisobutylene may be present as a treatment or tie-layer. In one implementation, polyisobutylene is functionalized to provide anchorage between layers in a multi-layer assembly. Non-limiting examples of functionalized polyisobutylene include: hydroxylated polyisobutylene (e.g. PIB-OH, HO-PIB-OH, and PIB-CH2-CH2-CH2-OH), vinyl terminated polyisobutylene (e.g. PIB-CH=CH2, Vi-PIB-Vi), and esterified polyisobutylene (e.g. PIB-CH-(COOEt)2). One experienced in the art would recognize that polyisobutylene can be functionalized in a variety of ways and may be selected based on other materials present and/or desired properties of the tape assembly.

[0057] In some implementations, the thickness of the gas barrier layer may be about 3 microns to about 80 microns. In another implementation, the thickness of the gas barrier layer may be about 3 microns to about 30 microns. In another implementation, the thickness of the gas barrier layer may be about 3 microns to about 16 microns. In some implementations, the thickness of the coating or treatment on the gas barrier layer may be about 100 nm or less. In one implementation, the thickness of the coating or treatment on the gas barrier layer may be about 30 nm or less.

[0058] Further, in one implementation, the double sided adhesive tape may comprise a release liner on at least one of the first adhesive layer and the second adhesive layer. In another implementation, the double sided adhesive tape may further comprise both a first release liner disposed on the first adhesive layer and a second release liner disposed on the second adhesive layer. In one implementation, the release liner(s) may control the surface topography or minimize the surface roughness of the first adhesive layer and/or second adhesive layer in order provide a lower haze value. Further, in one implementation, the release liner may be optically clear.

[0059] In one implementation, the release liner(s) used in the double sided adhesive tape may comprise films. In one implementation, the release liner(s) may comprise but may not be limited to polyethylene terephthalate. In one implementation, the release liner(s) may comprise polytetrafluoroethylene (PTFE). In one implementation, the release liner(s) used in the double sided adhesive tape may comprise polyester film. Further, in one implementation, the release liner(s) may be optically clear. Additionally, in one implementation, the release liner(s) and the film may be optically clear. One implementation, the release liner(s) may have a release coating.

[0060] In one implementation, the release liner(s) used in the double sided adhesive tape may comprise silicone surface coated films. In another implementation, the release liner(s) used in the double sided adhesive tape may comprise fluorosilicone surface coated films. In some implementations, the thickness of the release liner may not be limited. In some implementations, the thickness of the release liner may be about 25 microns to about 100 micron films in the manufacture of double sided adhesive tapes. In some implementations, the specific surface coating type may depend upon the adhesive type selected and the specified release properties of the release liner(s). In some implementations, the release liner is a silicone release liner having an average surface roughness (SA) of about 100 nm or less on the release side. In some implementations, the release liner is a silicone release liner having an average surface roughness (SA) of about 70 nm or less, when measured on the release side. In some implementations, the release liner is a silicone release liner having an average surface roughness (SA) of about 50 nm or less, when measured on the release side. In other implementations, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 125 nm or less, when measured on the release side. In other implementations, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 100 nm or less, when measured on the release side. In some implementations, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 80 nm or less, when measured on the release side. In some implementations, the solvent blend or wetting behavior of the adhesive layer on liner may affect the surface roughness. Further, the surface roughness may be affected by the coating method as a function of complex viscosity (gravure, roll, die coating, etc.). One experienced in the art would recognize that the surface roughness of the release side of the release layer is easily transferred to the gas barrier layer or the adhesive layer when forming the member assembly (also referred to herein as a sheet assembly). One experienced in the art would also recognize that surface roughness can be described in a variety of ways and the actual values measured can be highly influenced by the equipment selected, method used, area of the sample measured, and use of wavelength filters applied to the measurement. Surface roughness, as described herein by the 3D parameters, SA, SQ, and Sz, may be measured by a white light interferometer or optical profiler. Materials herein were tested using a Bruker Contour GT Optical Microscope with a measurement area of 1.26 mm x 0.95 mm. No filtering processes were used for data collection, unless otherwise specified. When a filtering process was applied, the filtering process used a Gaussian regression long cutoff X Y (mm) = 0.6 and short cutoff X Y (mm) = 0.

[0061] SA is a 3D parameter expanded from the roughness 2D parameter RA. It expresses the average of the absolute values of Z(x,y) in the measured area. It is equivalent to the arithmetic mean of the measured region on the 3D display diagram when valleys have been changed to peaks by conversion to absolute values. It is mathematically expressed as SA = 1/A jA.flZ(x,y)ldxdy. SQ is a 3D parameter expanded from the roughness parameter RQ. It expresses the root mean squared of Z(x,y) in the measured area. It is equivalent to the average mean squared of the measured region on the 3D display diagram when valleys have been changed to high peaks by squaring. It is mathematically expressed as SQ = V(l/A z2(x,y)ldxdy).

[0062] When the release layer comprises a fluorosilicone release coating, the average surface roughness, SA, of the release sheet may be about 175 nm or less, and also about 125 nm or less, when measured on the release side. When the release layer comprises a fluorosilicone release coating, the root mean square roughness, SQ, of the release sheet may be 200 nm or less, when measured on the release side. In one embodiment, when filmic release layers are used, optically clear films may be used as the facestock due to their smoothness (lower surface roughness) as compared to non-optically clear films.

Table 2. Example fluorosilicone release layers compared to a standard fluorosilicone release layer.

Figure imgf000023_0001

[0063] When the release layer comprises a silicone release coating, the surface roughness, SA, of the release sheet may be about 100 nm or less, about 70 nm or less, and also about 50 nm or less, when measured on the release side. The root mean square roughness, SQ, of the release sheet may be about 125 nm or less, about 100 nm or less, and also about 80 nm or less, when measured on the release side. In one embodiment, when filmic release layers are used, optically clear films may be used as the facestock in order to provide better smoothness (lower surface roughness) as compared to non-optically clear films.

Table 3. Example preferred silicone release layers compared to standard silicone release layers.

Silicone Release Layer SA (nm) SQ (nm)

Comparative Example 1 120.3 +/- 14.6 160.3 +/- 18.0

Comparative Example 2 108.9 +/- 13.1 147.0 +/- 14.7

Sample A 112.3 +/- 8.5 146.0 +/- 7.2 Sample B 112.7 +/- 15.6 142.3 +/- 19.4

Sample C 96.6 +/- 22.9 121.8 +/- 28.3

[0064] In other implementations, the release liner may comprise a fluorosilicone release liner. In some implementations, the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 175 nm or less, when measured on the release side. In some implementations, the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 125 nm or less, when measured on the release side. In other implementations, the release liner is a fluorosilicone release liner having a root mean squared roughness (SQ) of about 200 nm or less, when measured on the release side.

[0065] In some implementations, the release liner may comprise optically clear base films. In one implementation, the release liner may comprise optically clear PET. As such, the haze value may be reduced when optically clear films are used. In some implementations, the optically clear films used as the release liner may provide a smoother surface on the first adhesive layer and the second adhesive layer, where the average surface roughness, SA, may be measured by optical profilometry. In one embodiment, the SA of the release liner is about 175 nm or less. In another embodiment, the SA of the release liner is about 100 nm or less. In yet another embodiment, the SA of the release liner is about 70 nm or less.

[0066] Further, in one implementation, the double sided adhesive tape may comprise a release liner on at least one of the first adhesive layer and the second adhesive layer. In another implementation, the double sided adhesive tape may further comprise both a first release liner disposed on the first adhesive layer and a second release liner disposed on the second adhesive layer. In one implementation, the release liner(s) may control the surface topography or minimize the surface roughness of the first adhesive layer and/or second adhesive layer in order provide a lower haze value. In one implementation, the double sided adhesive tape may have a surface roughness of about 50 nm or less. Further, in one implementation, the release liner may be optically clear.

[0067] In one implementation, the release liner(s) used in the double sided adhesive tape may comprise films. In one implementation, the release liner(s) may comprise but may not be limited to polyethylene terephthalate. In one implementation, the release liner(s) may comprise polytetrafluoroethylene (PTFE). In one implementation, the release liner(s) used in the double sided adhesive tape may comprise polyester film. Further, in one implementation, the release liner(s) may be optically clear. Additionally, in one implementation, the release liner(s) and the film may be optically clear. One implementation, the release liner(s) may have a release coating.

[0068] In one implementation, the release liner(s) used in the double sided adhesive tape may comprise silicone surface coated films. In another implementation, the release liner(s) used in the double sided adhesive tape may comprise fluorosilicone surface coated films. In some implementations, the thickness of the release liner may not be limited. In some implementations, the thickness of the release liner may be about 25 microns to about 100 micron films in the manufacture of double sided adhesive tapes. In some implementations, the specific surface coating may depend upon the adhesive type selected and the specified release properties of the release liner(s). In some implementations, the release liner is a silicone release liner having an average surface roughness (SA) of about 70 nm or less. In some implementations, the release liner is a silicone release liner having an average surface roughness (SA) of about 50 nm or less. In other implementations, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 85 nm or less. In some implementations, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 70 nm or less. In some implementations, the solvent blend or wetting behavior on liner may affect the surface roughness. Further, the surface roughness may be affected by the applications such as deposition method as a function of complex viscosity (gravure, roll, die coating, etc.). One experienced in the art would recognize that the surface roughness of the release side of the release layer is easily transferred to the gas barrier layer or the adhesive layer when forming the member assembly. One experienced in the art would also recognize that surface roughness can be described in a variety of ways and the actual values measured can be highly influenced by the equipment selected, method used, area of the sample measured, and use of wavelength filters applied to the measurement. Surface roughness, as described herein by the 3D parameters, SA, SQ, and Sz, may be measured by a white light interferometer or optical profiler. Materials herein were tested using a Bruker Contour GT Optical Microscope with a measurement area of 1.26 mm x 0.95 mm. A filtering process was applied using a Gaussian regression long cutoff X Y (mm) = 0.6 and short cutoff X Y (mm) = 0.

[0069] SA is a 3D parameter expanded from the roughness 2D parameter Ra. It expresses the average of the absolute values of Z(x,y) in the measured area. It is equivalent to the arithmetic mean of the measured region on the 3D display diagram when valleys have been changed to peaks by conversion to absolute values. It is mathematically expressed as SA = 1/A jA.flZ(x,y)ldxdy. SQ is a 3D parameter expanded from the roughness parameter Rq. It expresses the root mean squared of Z(x,y) in the measured area. It is equivalent to the average mean squared of the measured region on the 3D display diagram when valleys have been changed to high peaks by squaring. It is mathematically expressed as SQ = V(l/A z2(x,y)ldxdy).

[0070] When the release layer comprises a fluorosilicone release coating, the average surface roughness, SA, of the release sheet may be about 100 nm or less, and also about 85 nm or less. When the release layer comprises a fluorosilicone release coating, the root mean square roughness, SQ, of the release sheet may be 110 nm or less. In one embodiment, when filmic release layers are used, optically clear films may be used as the facestock due to their smoothness (lower surface roughness) as compared to non- optically clear films.

Table 4. Example fluorosilicone release layers compared to a standard fluorosilicone release layer.

Figure imgf000026_0001

[0071] When the release layer comprises a silicone release coating, the surface roughness, SA, of the release sheet may be about 70 nm or less, and also about 50 nm or less. The root mean square roughness, SQ, of the release sheet may be 85 nm or less, and also about 70 nm or less. In one embodiment, when filmic release layers are used, optically clear films may be used as the facestock in order to provide better smoothness (lower surface roughness) as compared to non-optically clear films.

Table 5. Example silicone release layers compared to a standard silicone release layer.

Silicone Release Layer SA (nm) SQ (nm)

Comparative Example 1 77.6 +/- 1.3 113.3 +/- 2.9

Comparative Example 2 74.2 +/- 1.7 110.0 +/- 1.0

Sample A 52.1 +/- 1.9 83.2 +/- 1.5

Sample B 45.5 +/- 4.1 62.1 +/- 4.5 Sample C 43.6 +/- 2.1 59.4 +/- 2.7

[0072] In other implementations, the release liner may comprise a fluorosilicone release liner. In some implementations, the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 100 nm or less. In some implementations, the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 85 nm or less. In other implementations, the release liner is a fluorosilicone release liner having a root mean squared roughness (SQ) of about 1 10 nm or less.

[0073] In some implementations, the release liner may comprise optically clear base films. In one implementation, the release liner may comprise optically clear PET. As such, the haze value may be reduced when optically clear films are used. In some implementations, the optically clear films used as the release liner may provide a smoother surface on the first adhesive layer and the second adhesive layer, where the surface roughness, Sa, may be measured by optical profilometry. In one embodiment, the Sa of the release liner is about 50 nm or less. In another embodiment, the Sa of the release liner is about 30 nm or less. In yet another embodiment, the Sa of the release liner is about 10 nm or less.

[0074] Further, in some implementations, surface roughness of the release side of the release liner may be transferred to at least one adhesive layer when forming a member assembly. Further, surface roughness may be provided in a variety of ways, and the actual values measured may be influenced by the equipment selected, method used, area of the sample measured, and use of wavelength filters applied to the measurement. In some implementations, the surface roughness of a release liner may aid in attaining "optical clarity" of an adhesive layer or member assembly since the roughness may be transferred from the liner surface to the surface of at least one adhesive layer. In one implementation, a comparison of fluorosilicone release coatings and silicone release coatings provided that since fluorosilicones are copolymers with a phase morphology, the inherent morphology may lead to a rougher coating of an adhesive. In another implementation, a comparison of white PET and clear PET provided that white PET may result in a rougher surface of an adhesive when coated with silicone as compared to clear PET. In yet another implementation, a comparison of optically clear PET and standard PET provided that optically clear PET may result in a smoother surface of at least one adhesive layer.

[0075] Still, surface roughness data may be provided in either a raw data mode or in a "filtered" mode. In a filtered mode, some wavelengths of light are filtered out. Depending upon the nature of the surface defects, some defects may be "hidden" or not observed when filters are used. Therefore, disclosure of surface roughness data in literature without describing the specific method used may not provide a fair comparison of surface roughness data in different samples.

[0076] There may be at least two methods for creating a siliconized release layer on film. In the first method, referred to as an off-line method, silicone may be applied to a "finished" PET. In the second method, referred to as an in-line method, silicone may be applied to an "unfinished" PET, and then the PET is stretched and possibly annealed into a finished form. In some embodiments, the in-line method may yield a siliconized film with a much lower deposition of silicone than off-line since the PET stretching step may also cause the silicone coating to be stretched out.

[0077] In some implementations, release liners that may be used in the embodiments disclosed within may include: 1) silicone or fluorosilicone, where possible, based on the adhesive type used in the assembly; 2) clear or white or otherwise pigmented films; 3) optically clear or standard PET base film; 4) unfiltered surface roughness data may describe the surface roughness of a release layer (if filtered data is used, the filtering mechanism must be disclosed); and/or 5) in-line process liners or off-process liners.

[0078] In some implementations, the product construction of the optically clear, gas barrier, double sided adhesive tape may include the following layers in the noted arrangement below.

Layer 1 : First release liner (optional)

Layer 2: First adhesive layer

Layer 3: Gas barrier layer (single or multi-layer)

Layer 4: Second adhesive layer

Layer 5: Second release liner (optional)

In some implementations, printing may be added to at least one release liner of the double sided adhesive tape.

[0079] FIGURE 1 schematically illustrates a cross section of an embodiment of an adhesive tape

100 in accordance with what is disclosed herein. The adhesive tape 100 comprises an optically clear, gas barrier layer (or film) 20 defining a first face 21 and an oppositely directed second face 23. The adhesive tape 100 also comprises a first adhesive layer 30 and disposed on the first face 21 of the gas barrier layer 20. The adhesive tape 100 also comprises a second adhesive layer 40 disposed on the second face 23 of the gas barrier layer 20. The outwardly directed face of the first adhesive layer 30 may be shown as adhesive face 32, and the outwardly directed face of the second adhesive layer 40 may be shown as adhesive face 42.

[0080] FIGURE 2 schematically illustrates a cross section of an embodiment of an adhesive tape

110 in accordance with what is described herein. The adhesive tape 110 comprises the assembly of layers 20, 30, and 40 as previously described in association with FIGURE 1. The tape 110 additionally comprises a first release liner 50 disposed on the first adhesive layer 30, and a second release liner 60 disposed on the second adhesive layer 40. The outwardly directed face of the first release liner 50 may be shown as the first release face 52, and the outwardly directed face of the second release liner 60 may be depicted as second release face 62.

[0081] In many embodiments, the optically clear, gas barrier, double sided adhesive tapes disclosed herein may include two adhesive layers, the first adhesive layer 30 and the second adhesive layer 40. In some implementations, the thickness of the first adhesive layer 30 and the second adhesive layer 40 may not be limited such that the WVTR, optical transmission, haze value, and flexibility requirements are met. In one implementation, the thickness of at least one of the first adhesive layer and the second adhesive layer may be about 3 microns to about 80 microns. In one implementation, the thickness of each of the first adhesive layer and the second adhesive layer may be about 3 microns to about 80 microns. In another implementation, the thickness of at least one of the first adhesive layer and the second adhesive layer may be about 3 microns to about 30 microns. In another implementation, the thickness of each of the first adhesive layer and the second adhesive layer may be about 3 microns to about 30 microns. In yet another implementation, the thickness of at least one of the first adhesive layer and the second adhesive layer may be about 3 microns to about 16 microns. In some implementations, the first adhesive layer 30 and the second adhesive layer 40 may be about the same thickness. In other implementations, the first adhesive layer 30 and the second adhesive layer 40 may be different thicknesses.

METHODS FOR DOUBLE SIDED ADHESIVE TAPE

[0082] Also disclosed is a method for producing a double sided adhesive tape. In one implementation, a method for producing optically clear double sided adhesive tapes is disclosed. In another implementation, the double sided adhesive tape may comprise at least one pressure sensitive adhesive. In another implementation, the double sided adhesive tape may comprise the materials disclosed above. In yet another implementation, the double sided adhesive tape may exhibit properties disclosed above.

In one implementation, the method of producing double sided adhesive tapes comprising: 1) coating at least a portion of a first release liner with a first adhesive layer; 2) providing an optically clear gas barrier layer comprising a first face and a second face opposite the first face; 3) at least partially laminating the first adhesive layer on the first face of the optically clear gas barrier layer; 4) coating at least a portion of a second release liner with a second adhesive layer; and 5) at least partially laminating the second adhesive layer on the second face of the optically clear gas barrier layer. Alternatively, the method of producing double sided adhesive tapes comprising: 1) coating at least a portion of a first release liner with a first adhesive layer; 2) providing an optically clear gas barrier layer comprising a first face and a second face opposite the first face; 3) at least partially laminating the first adhesive layer on the first face of the optically clear gas barrier layer; 4) coating at least a portion of the second face of the optically clear gas barrier layer with a second adhesive layer; and 5) providing a second release liner to the second adhesive layer. In many embodiments, the methods for producing a double sided adhesive tape may comprise certain steps that may be added, removed, altered, or executed in a different order.

[0083] In one implementation, at least a portion of a first release liner may be coated with a first adhesive layer. In one implementation, coating at least a portion of a first release liner may provide a adhesive layer on the first release liner.

[0084] In one implementation, an optically clear gas barrier layer comprising a first face and a second face opposite the first face may be at least partially laminated on the first adhesive layer. In another implementation, an optically clear gas barrier layer comprising a first face and a second face opposite the first face may be fully laminated onto the first adhesive layer.

[0085] In one implementation, the method may include coating at least a portion of the surface of a second release liner with a second adhesive layer and at least partially laminating the second adhesive layer on the second face of the optically clear gas barrier layer. In another implementation, the method may include laminating the portion of the double sided adhesive tape that includes at least the first release liner, the first adhesive layer, and the gas barrier layer to the portion of the double sided adhesive tape that includes the second adhesive layer and the second release liner.

[0086] In one implementation, the method for producing the double sided adhesive tape may further comprise winding the double sided adhesive tape into a roll. In one implementation, winding the roll may include the following components: the release liner, the second adhesive layer, the gas barrier layer, and the first adhesive layer (all described above in detail). The roll may also comprise optional protective sheet. In some implementations, the optional protective sheet for the gas barrier layer may be provided to reduce defects and to aid in the handling of the double sided adhesive tape at a particular thickness. In one implementation, the optional protective sheet may be provided with the gas barrier layer, and the optional protective sheet may not be removed but instead kept for continued protection during processing. In yet another implementation, the optional protective sheet may be at least partially removed from the gas barrier layer prior to the addition of the second adhesive layer. [0087] In another implementation, the method for producing the double sided adhesive tape may further comprise providing the double sided adhesive tape in sheets.

[0088] In one implementation, at least one of the first adhesive layer and the second adhesive layer of the double sided adhesive tape may be applied by conventionally known coating methods, including but not limited to at least one coater of a gravure roll coater, a micro-gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, a spray coater, and a die coater. In some implementations, certain coating techniques may be more suited to coating specific adhesive compositions (e.g. acrylic based adhesives, silicone based adhesives, etc.) and/or specific forms of adhesive compositions (e.g. solvent vs. solvent-free). In some implementations, certain coating techniques may also be more suited to obtain certain adhesive thicknesses and high optically clarity (low haze value).

[0089] In one implementation, the double sided adhesive tape may also be produced as a first pass material in which both the first adhesive layer and the second adhesive layer are coated to a gas barrier layer and laminated in the line.

[0090] In one implementation, the adhesive(s) in the first adhesive layer or the second adhesive layer may be filtered prior to forming the respective adhesive layers. In the filtration, gels or other contaminants may be removed. In another implementation, process conditions may be selected to minimize wrinkling, scratching, bubbling, blistering, orange peel, or other possible defects that may occur to the first adhesive layer, the gas barrier layer, the second adhesive layer, and/or optional release liner(s). In another implementation, certain methods for anchorage of the first adhesive layer and/or the second adhesive layer onto the gas barrier layer may also be employed, including but not limited to: 1) the addition of an anchorage additive into the first adhesive layer and/or the second adhesive layer, and 2) the modification of the surface of the gas barrier layer, such as by primer, corona treatment, or plasma treatment.

[0091] In one embodiment, the method for producing the double sided adhesive tape may include manufacturing the optically clear, gas barrier, double sided adhesive tape in a class 10,000 cleanroom or lower. In another implementation, the double sided adhesive tape may be manufactured in a class 1 ,000 cleanroom or lower. In yet another implementation, the double sided adhesive tape may be manufactured in a class 1 cleanroom environment.

MEMBER ASSEMBLY OF THE DOUBLE SIDED ADHESIVE TAPE

[0092] The member assembly 210 may comprise at least one member 200 and at least one double sided adhesive tape. The member assembly 210 may comprise: 1) the member 200 comprising a surface; 2) the double sided adhesive tape disposed on the surface of the member 200, the double sided adhesive tape comprising: (i) an optically clear gas barrier layer 20 comprising a first face and a second face opposite the first face; (ii) a first adhesive layer 30 disposed on the first face; and (iii) a second adhesive layer 40 disposed on the second face; the double sided adhesive tape having: a total light transmittance of at least about 85% within the visible spectrum; a haze value of about 3% or less; a water vapor transmission rate (WVTR) of about 35 g/m2/day or less at about 45 °C/100% RH; and a thickness of the double sided adhesive tape about 100 microns or less.

[0093] FIGURE 3 schematically illustrates a member assembly 210 comprising a member 200 having the double sided adhesive tape disposed on the member 200, in which the double sided adhesive tape comprises a gas barrier layer 20, a first adhesive layer 30, and a second adhesive layer 40. The tape may optionally comprise the release liner 60 covering the second adhesive face 62 of the otherwise exposed second adhesive layer 40.

[0094] In one implementation the member 200 may comprise at least one member of an electronic member and an optical member. In one implementation, the member 200 may be an electronic member. In another implementation, the member 200 may comprise an optical member. In another implementation, the member 200 may comprise another substrate material which may comprise, but not limited to, metal, plastic, glass, fabric, composite, liquid crystalline polymer, and/or other materials. In yet another implementation, the member 200 may also comprise at least one of: 1) OLED layers; 2) sensor layers: 3) AMOLED layers; and 4) quantum dots. In one implementation, the member 200 may comprise various lighting sources, including but not limited to OLED encapsulation. In one implementation, the member 200 may comprise one substrate material. In another implementation, the member 200 may include more than one substrate material.

[0095] In another implementation, the member assembly 210 may comprise the optically clear double sided adhesive tape and at least one member 200. In one implementation, the member assembly 210 may include at least one double sided adhesive tape with gas barrier properties. Further, in one implementation, the member assembly 210 may include at least one double sided adhesive tape with at least one gas barrier layer. In another implementation, the member assembly 210 may include a double sided adhesive tape that may comprise an adhesive. In one implementation, the member assembly 210 may include at least one adhesive comprising acrylic based adhesives, rubber based adhesives, polyurethane based adhesives, silicone based adhesives, and hybrid adhesives. In another implementation, the member assembly 210 may include the double sided adhesive tape comprising materials described herein. In one implementation, the member assembly 210 may exhibit corrosion resistance or low corrosion. In another implementation, the member assembly 210 may include a double sided adhesive tape that is substantially free of acidic components and/or ionic components. In yet another implementation, the member assembly 210 may be highly flexible, bendable, and conformable. In one implementation, the member assembly 210 may include a double sided adhesive tape with the properties of implementations of the double sided adhesive tape described herein.

[0096] In one implementation, the member assembly 210 may comprise at least one member 200 disposed or adhered to at least one portion of the double sided adhesive tape as previously described herein. In one implementation, the member assembly 210, having a surface, may be disposed along the first adhesive layer 30 of the double sided adhesive tape. In another implementation, the second adhesive layer 60of the double sided adhesive tape may be disposed or adhered to the member assembly 210, including the member 200, to a substrate or other mounting surface (as further described in FIGURE 4). In yet another implementation not shown in FIGURE 3, the member assembly 210, having a surface, may be disposed along the second adhesive layer 40 of the double sided adhesive tape, and the first adhesive layer disposed on the substrate (as further described in FIGURE 4).

[0097] Although what is illustrated in FIGURE 3 provides a single member assembly 210, at least one additional member assembly may be disposed on the member assembly 210 to provide a multi layered stacked assembly. In one implementation, at least one additional member assembly may be disposed on the member assembly 210.

[0098] FIGURE 4 schematically illustrates a substrate assembly 310 comprising the member 200, the adhesive tape comprising the gas barrier layer 20, the first adhesive layer 30, and the second adhesive layer 40, and a substrate 150 to which the double sided adhesive tape may be disposed. The second adhesive layer 40 of the tape may be at least partially in contact with and disposed to the surface 152 of the substrate 150. Although what is illustrated in FIGURE 4 provides a single substrate assembly 310, at least one additional member assembly 210 may be disposed on the member assembly 210 to provide a multi layered stacked substrate assembly.

ADHESIVE TRANSFER TAPES

[0099] As provided herein, an adhesive transfer tape may comprise: 1) an adhesive layer comprising a first face and a second face opposite the first face; and 2) at least one release liner disposed on at least one of the first face and the second face of the adhesive layer, the adhesive transfer tape having: a) a total light transmittance of at least about 85% within the visible spectrum; b) a haze value of about 3% or less; c) a water vapor transmission rate (WVTR) of about 500 g/m2/day or less at about 45 °C/100% RH; and d) a thickness of the adhesive layer about 25 microns or less.

[00100] In many implementations, the adhesive transfer may be optically clear, as further described below. As described herein, the adhesive transfer tape disclosed may also exhibit certain characteristics. In many implementations, adhesive transfer tape described herein may have a total light transmittance of at least about 85% within the visible spectrum. In one implementation, the adhesive transfer tape may have a total light transmittance of at least about 90%. The total light transmittance may describe a total light transmittance in the range of the visible spectrum, which may be within a wavelength range of about 400 nm to about 780 nm. In one implementation, the total light transmittance may be measured, for example by ASTM El 348. In one implementation, the adhesive transfer tape may optionally have a light transmittance of about 5% or less at about 380 nm wavelength. In another implementation, the adhesive transfer tape may optionally have a light transmittance of about 1% or less at about 380 nm wavelength. For the lower light transmittance in the lower wavelengths of the visible spectrum and wavelengths into the UV spectrum, which may also be referred to as the ultraviolet ray (UV) cutting property, the light transmittance may be altered by the adhesive composition of the adhesive layer.

[00101] In one implementation, the adhesive transfer tape described herein may provide an optically clear tape. In one implementation, the term "optically clear" may describe a tape that has a haze value of about 3% or less. In another implementation, the term "optically clear" may describe a tape that has a haze value of about 1% or less. In yet another implementation, the term "optically clear" may describe a tape that has a haze value of about 0.5% or less. In one implementation, the haze value may be measured, for example, by ASTM D1003. In another implementation, the haze value may be measured by BS EN ISO 13468 Parts 1 and 2. Additionally, in one implementation, the optical clarity of the adhesive transfer tape may be within about 10% or less of the original haze value after heat aging, regardless of adhesive chemistry. In another implementation, the optical clarity of the adhesive transfer tape may be within about 5% or less of the original haze value after heat aging, regardless of adhesive chemistry. In some implementations, the difference in the haze value after aging may be higher than 10% as long as the haze value remains less than about 1%. In some implementations, heat aging may describe conditions where the adhesive transfer tape is subjected to about 500 hours at about 65 °C and about 95% relative humidity. In other implementations, heat aging may include heating to elevated temperatures (e.g., about 60 to about 90° C), optionally, under elevated humidity conditions (e.g., about 80 to about 90 percent relative humidity), for a period of time (e.g., 1 day to 1 month), followed by a rapid cool down to ambient condition (e.g. cooling to room temperature within minutes after exposure to the elevated heat and elevated humidity). In some implementations, the adhesive transfer tape described herein may have a high refractive index or matched refractive index to the application member. In one implementation, the adhesive transfer tape may have a refractive index of about 1.25 to about 1.80. In another implementation, the adhesive transfer tape may have a refractive index of about 1.40 to about 1.60. The values for the refractive index may be relatively similar after heat aging. The refractive index may be measured by ASTM D542 at 25 °C.

[00102] In some implementations, the adhesive transfer tape described herein may have a water vapor transmission rate (WVTR) of about 500 g/m2/day or less when measured at about 45° C and about 100% relative humidity, regardless of adhesive chemistry. In one implementation, the adhesive transfer tape may have a water vapor transmission rate (WVTR) of about 200 g/m2/day or less when measured at about 45° C and about 100% relative humidity, regardless of adhesive chemistry. In one implementation, the adhesive transfer tape may have a water vapor transmission rate (WVTR) of about 100 g/m2/day or less when measured at about 45° C and about 100% relative humidity, regardless of adhesive chemistry. The WVTR of the adhesive transfer tape may also remain relatively unaffected by hybrid adhesive chemistries. In one implementation, the WVTR may be measured, for example, by ASTM F1249 or ASTM E96.

[00103] The thickness measurements of the adhesive transfer tape may only include the adhesive layer. In some implementations, the thickness of the adhesive layer may be about 25 microns or less. In one implementation, the thickness of the adhesive layer may be about 15 microns or less. In another implementation, the thickness of the adhesive layer may be about 10 microns or less. In yet another implementation, the thickness of the adhesive layer may be about 5 microns or less.

[00104] In one implementation, the adhesive transfer tape may comprise additives that may affect the WVTR in at least one of the adhesive layers. The additives that may affect the WVTR may provide relatively minimal changes in optical properties. In some implementations, the additives that may affect the WVTR may comprise nanoparticles. In some implementations, the nanoparticles may comprise a metal oxide. In one implementation, the nanoparticles may comprise titanium dioxide nanoparticles. In another implementation, the nanoparticles may comprise zinc oxide nanoparticles. In another implementation, the nanoparticles may comprise aluminum oxide nanoparticles. In one implementation, the adhesive layer may comprise about 1% to about 70% by weight nanoparticles. In another implementation, the adhesive layer may comprise about 5% to about 70% by weight nanoparticles. In one implementation, the adhesive layer may comprise about 10% to about 60% by weight nanoparticles. In another implementation, the adhesive layer may comprise about 30% to about 60% by weight nanoparticles. In some implementations, the nanoparticle loading on a % weight based on the density of the nanoparticles. The nanoparticles can be various sizes. In one implementation, the nanoparticle may have a mean diameter of about 3 nanometers to about 100 nanometers. In another implementation, the nanoparticle may have a mean diameter of about 5 nanometers to about 75 nanometers. In one implementation, the nanoparticle may have a mean diameter of about 5 nanometers to about 50 nanometers. In another implementation, the nanoparticle may have a mean diameter of about 5 nanometers to 30 nanometers. In some embodiments, the nanoparticles may be surface modified. Surface-modifying agents may include, but are not limited to, silanes (including organosilanes), organic acids organic bases, and alcohols. Further, the adhesive of the adhesive transfer tape may comprise fillers which can interact with oxygen and/or water vapor, chemically or physically bound to said fillers. Said fillers may also referred to as "getter," "scavenger," "desiccant," or "absorber," and may comprise but are not limited to oxidizable metals, halides, salts, silicates, oxides, hydroxides, sulphates, sulphites, carbonates of metals and transition metals, perchlorates and activated carbon, including its modifications. Additional examples may also include cobalt chloride, calcium chloride, calcium bromide, lithium chloride, zinc chloride, zinc bromide, silicon dioxide (silica gel) aluminium oxide (activated aluminium), calcium phosphate, copper sulphate, sodium dithionite, sodium carbonate, magnesium carbonate, titanium dioxide, bentonite, montmoriUonite, diatomaceous earth, zeolites and oxides of alkali or alkaline earth metals such as barium oxide, calcium oxide, iron oxide, magnesium oxide, and carbon nanotubes.

[00105] Additionally, in some implementations, the member assembly comprising the adhesive of the adhesive transfer tape may exhibit corrosion resistance or low corrosion. In some implementations, the adhesive of the adhesive transfer tape may exhibit low corrosion. In some implementations, the adhesive of the adhesive transfer tape may exhibit low resistivity.

[00106] In some implementations, the dielectric constant may be measured, for example, by ASTM

D150, frequencies IKHz- IMHz. In one implementation, the dielectric constant for the adhesive transfer tape may be about 2 to about 6, even after heat aging. In another implementation, the dielectric constant for the adhesive transfer tape may be about 2.5 to about 3.5, even after heat aging. In some implementations, the variation of dielectric constant measured is within about 10%. In many implementations, the adhesive of the adhesive transfer tape may exhibit low corrosion to metallic surfaces, including but not limited to metals, metal oxides, and metal alloys. In some implementations, representative metallic surfaces may include chromium, copper, nickel, silver, silver paste, titanium, tin, aluminum, aluminum alloy, zirconium, copper oxide, indium oxide, indium tin oxide, indium zinc oxide, nickel oxide, antimony-doped tin oxide, titanium oxide, zinc oxide, zirconium oxide, copper-nickel alloy, copper-zirconium alloy, copper-nickel- titanium alloy, tin-silver alloy, and mixtures thereof. In some implementations, the member assembly comprising the adhesive of the adhesive transfer tape may exhibit corrosion resistance or low corrosion to other surfaces including but not limited to lighting sources such as OLED encapsulation.

[00107] In some implementations, the member assembly comprising the adhesive transfer tape may exhibit corrosion resistance or low corrosion when certain additives may be used in the adhesive layer. In some implementations, such additives that may provide corrosion resistance may include, but are not limited to, compounds with nitrogen, phosphorus, oxygen, and sulfur. In one implementation, the adhesive layer may comprise silicone where the corrosion additives may comprise about 0.1% to about 1.0% by weight of the adhesive composition. In one implementation, the adhesive layer may comprise other chemistries besides silicone where the corrosion additives may comprise about 0.1% to about 10% by weight of the adhesive composition.

[00108] In another implementation, the adhesive layer of the adhesive transfer tape may comprise at least one corrosion resistance additive, which may or may not also be a UV cutting agent. In one implementation, the corrosion resistance additive may comprise at least one of benzophenones (A), benzotriazoles (B), triazines (C), oxanilides (D), crown ethers, porphyrins, phthalocyanines, pyrimidines, HALS (described below), and combinations thereof. In some implementations, the corrosion resistance additives may comprise rings containing heteroatoms. In some implementations, the corrosion resistance additives may comprise tertiary amines. Some corrosion resistance additives may include, but are not limited to:

Figure imgf000037_0001

A

Figure imgf000037_0002

B

Figure imgf000038_0001

C

Figure imgf000038_0002

D

[00109] In some implementations, the adhesive of the adhesive transfer tape may comprise hindered amine lights stabilizers (HALS). HALS may be radical scavengers and stabilizers. In some embodiments, the HALS may be an additive in the double sided adhesive tape, transfer tape, and/or adhesive described herein. In some embodiments, the HALS may be a corrosion resistance additive in the double sided adhesive tape, transfer tape, and/or adhesive described herein. HALS may be oligomeric and contain triazines in their structure. Examples of the hindered amine -based light stabilizer may include, but are not limited to, a polymerized product of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-l-piperidine ethanol (trade name "TINUVIN 622", manufactured by BASF), a reaction product of a polymerized product of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-l-piperidine ethanol with N,N',N",N"'-tetrakis- (4,6-bis-(butyl-(N-methyl-2,2,6,6-tetramethylpiperidine-4-yl)amino)-triazin-2-yl)-4,7-diazadecane-l,10 diamine (weight ratio thereof is 1 : 1) (trade name "TINUVIN 119", manufactured by BASF), a polycondensation product of dibutylarnine. l,3-triazine.N,N'-bis(2,2,6,6-tetramethyl- 4-piperidyl-l,6- hexamethylenediamine and N-(2,2,6,6-tetramethyl-4-piperidyl)butylamine ((trade name "TINUVIN 2020", manufactured by BASF), poly[{6-(l,l,3,3-tetramethylbutyl) amino-l,3,5-triazin-2,4-diyl} {2,2,6,6- tetramethyl-4-piperidyl}imino]hexamethylene{(2,6,6-tetramethyl-4-piperidyl)imino}) ((trade name "TINUVIN 944", manufactured by BASF), a mixture of bis(l,2,2,6,6-pentamethyl-4-piperidyl)sebacate and methyl- 1, 2,2,6, 6-pentamethyl-4-piperidyl sebacate (trade name "TINUVIN 765", manufactured by BASF), bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate (trade name "TINUVIN 770", manufactured by BASF), a reaction product of decanedioic acid bis(2,2,6,6-tetramethyl-l-(octyloxy)-4- piperidinyl)ester(l,l-dimethylethylhydroperoxide) and octane (trade name "TINUVIN 123", manufactured by BASF), bis(l,2,2,6,6-pentamethyl-4-piperidyl)[[3,5-bis (l,l-dimethylethyl)-4- hydroxyphenyl] methyl] butylmalonate (trade name "TINUVIN 144", manufactured by BASF), a reaction product of 2-aminoethanol with a reaction product of cyclohexane and N-butyl-2,2,6,6-tetramethyl-4- piperidineamine-2,4,6-trichloro-l,3,5-triazine peroxide (trade name "TINUVIN 152", manufactured by BASF), a mixture of bis(l,2,2,6,6-pentamethyl-4-piperidyl)sebacate and methyl- l,2,2,6,6-pentamethyl-4- piperidyl sebacate (trade name "TINUVIN 292", manufactured by BASF). The HALS structure may comprise:

Figure imgf000039_0001

tetra-reethyf-p!pefidine

where R= -H, CH3, - O-R', -O-CO-CH3. In certain embodiments, oxanalides, a type of UV absorber, may be used as corrosion resistant additives and/or UV cutting agents.

[00110] In one implementation, the adhesive layer of the adhesive transfer tape may comprise other

UV absorbers. Such UV absorbents may include, for example, salicylic acid ester type compounds, benzophenone type compounds, and benzotriazole type compounds. In many implementations, combinations of UV absorbers, corrosion resistance additives, and/or UV cutting agents may be added to the adhesive.

[00111] In another implementation, the adhesive layer may comprise at least one corrosion resistance additive. In one implementation, the corrosion resistance additive may include benzophenones. In one implementation, the benzophenone may comprise (2-hydroxy-4-(octyloxy)phenyl)phenyl methanone (illustrated below in Structure I and commercially available as Hostavin AR08 from Clariant). In another implementation, the corrosion resistance additive may include benzotriazoles. In yet another implementation, the corrosion resistance additive may include triazines. In one implementation, the triazine may comprise hydroxyphenyl triazine. In another implementation, the hydroxyphenyl triazine may comprise 2,4-bis[2-hydroxy-4-butoxyphenyl]-6-(2,4-dibutoxyphenyl)-l,3,5-triazine) (illustrated below in Structure II and commercially available as Tinuvin 460 from BASF).

Figure imgf000040_0001

[00112] In some implementations, the addition of at least one corrosion resistance additive in the adhesive layer may be adjusted for compatibility with the adhesive(s). In one implementation, the concentration of the corrosion resistance additive may be adjusted based on solubility. In some implementations, the addition of at least one corrosion resistance additive in the adhesive layer may be adjusted for transparency with the adhesive(s), including transparency in a certain wavelength range. In other implementations, the addition of at least one corrosion resistance additive in the adhesive layer may be adjusted to control light transmission and haze. In one embodiment, benzotriazole and benzophenone may be added to a silicone based adhesive. In one embodiment using the combination of benzotriazole and benzophenone, less than 1.5% may be used. In one embodiment, a combination of HALS and benzotriazole may be added to an acrylic based adhesive.

In another embodiment, a combination of HALS and benzotriazole at about 3% to about 8% may be added to an acrylic based adhesive.

[00113] In some implementations, the member assembly comprising the adhesive transfer tape may exhibit corrosion resistance or low corrosion to various surfaces when visually inspected. In some implementations, the member assembly comprising the adhesive transfer tape may exhibit corrosion resistance or low corrosion when visually inspected after aging for about 500 hours at about 65 °C temperature and about 90% relative humidity.

[00114] In another implementation, the adhesive transfer tape may be highly flexible, bendable, and conformable. In one implementation, the adhesive transfer tape may be bendable at certain angles repeatedly without affecting the optical properties of the adhesive transfer tape. In one implementation, the adhesive transfer tape may be bendable at certain angles repeatedly without cracking the adhesive transfer tape. In one implementation, the adhesive transfer tape may be bendable at certain angles repeatedly without imparting defects in the adhesive transfer tape. In one implementation, the adhesive transfer tape may be conformed around a member and/or substrate, including but not limited to curved and irregular members and substrates. In one implementation, the adhesive transfer tape may be highly flexible, bendable, and conformable where it may be used in OLED, AMOLED, quantum dots, or other flexible electronics applications. Conformability may be measured using an ink step test. In some implementations, the adhesive transfer tape may also be stretchable.

[00115] Additionally, the adhesive transfer tape may exhibit adhesion to a variety of materials such as glass, PMMA, aluminum, PET at both room temperature and elevated temperatures like 85 °C. In one implementation, the peel adhesion of the adhesive transfer tape may be at least 0.1 N/mm. In another implementation, the peel adhesion of the adhesive transfer tape may be at least 0.3 N/mm. In one implementation, the peel adhesion of the adhesive transfer tape may be at least 0.5 N/mm. In one implementation, the impact tensile may be at least about 35 mJ/cm2. In another implementation, the impact tensile may be at least about 20 mJ/cm2. In one implementation, the impact tensile may be at least about 10 mJ/cm2. Further, in one implementation, the impact shear may be at least about 0.1 J/cm2. In another implementation, the impact shear may be at least about 0.01 J/cm2. In one implementation, the impact shear may be at least about 0.05 J/cm2.

[00116] In many implementations, the adhesive layer of the adhesive transfer tape may comprise various adhesive chemistries. In some implementations, the adhesive layer comprises at least one adhesive of acrylic based adhesives, synthetic rubber based adhesives, polyurethane based adhesives, polyester based adhesives, silicone based adhesives, and hybrid adhesives. Hybrid polymers may include, for example, acrylic modified silicone adhesive, organic modified silicone PSA, another hybrid technology, or combinations thereof.

[00117] In one implementation, the adhesive layer of the adhesive transfer tape may comprise an acrylic based adhesive. In one implementation, the acrylic based adhesive may be a solvent-based adhesive. In one implementation, the acrylic based adhesive may be a solvent-free adhesive. The composition of the acrylic adhesive is not limited, but may be chosen for to provide the optical clarity, barrier properties, corrosion resistance, and other properties. Silicone based PSAs are described in the art, such as US patents 4,584,355; 5,726,256; 5,869,556; 2012/0172543; and European patent 1,957,597, for example.

[00118] One type of silicone based adhesive may be prepared by a bodying reaction between reactive polyorganosiloxane polymers (sometimes referred to as a gum) and reactive polyorganosiloxane resin(s). "Bodying" may refer to reacting a polymer and resin to increase molecular weight, crosslinking, or both. These silicone based adhesives may further be free-radical cross-linked using, for example, a peroxide crosslinker, such as benzoyl peroxide, through hydrogen abstraction and creation of ethylene linkages.

[00119] In another implementation, the adhesive layer of the adhesive transfer tape may comprise a silicone based gel. In one implementation, the adhesive layer of the adhesive transfer tape may comprise a silicone based pressure sensitive adhesive (PSA).

[00120] Another type of silicone based adhesive may be an addition curable silicone based adhesive. The addition curable silicone may be prepared using a combination of (i) at least one MQ organopolysiloxane resin, (ii) at least one alkenyl functional polydiorganosiloxane, with in-chain and/or end-chain alkenyl functionality, (iii) at least one organohydrogenpolysiloxane crosslinking agent, and (iv) a suitable curing amount of a hydrosilylation catalyst, such as platinum, iron, or copper where the total amount of components (i) and (ii) being 100 parts by weight. The weight ratio of (i) to (ii) is within a range of from 70:30 to 35:65, or between 65:35 to 40:60. The amount of (iii) may be adjusted to provide the desired performance, and may provide a molar ratio of said SiH groups of component (iii) to said alkenyl groups of component (ii) of at least 1.0.

[00121] In some embodiments, the use of addition curable silicone -based adhesive of the present subject matter may also be substantially acid-free (substantially free of acidic components) and/or substantially free of ionic components. Free-radical curable and blends of free -radical curable and addition curable silicone based adhesives may also be used for the present subject matter, provided acidic byproducts are minimized through formulation and process controls in order to limit corrosion resistance to metallic surfaces in application. Corrosion resistance to metallic surfaces may be measured visually, for example, after aging for about 500 hours at about 65 °C temperature and about 90% relative humidity. In general, the PSA compositions may include components with a diverse range of structures, molecular weights, reactive functions and viscosities. Inert solvents, silicone fluids, catalysts, fillers, stabilizers, and other additives may also be present.

[00122] The silicone-based adhesive may include dispersions with a repeat formula of R^SiCha or

R'P^SiCha, such as polydimethylsiloxanes, polydimethyl/methylvinyl siloxanes, polydimethyl/methylphenyl siloxanes, polydimethyl/diphenyl siloxanes, and blends thereof and silicone resins, such as MQ resins or blends of resins. Examples of M units in the resin may include but is not limited to Me3SiOi/2, Me2ViSiOi/2, Me2PhSiOi/2, Ph2MeSiOi/2, MeVi2SiOy2, HOMe2SiOy2, (HO)2MeSiOy2, Me2HSiOy2, Me2H2SiOy2, where Me = methyl, OH = hydroxyl, Vi = vinyl, and Ph = phenyl. Q units can be defined as S1O4/2. R1 or R2 may be any monovalent organic, or hydroxyl group or hydrogen. One skilled in the art would recognize that any polyorganosiloxane resins bodied or dispersed with the polyorganosiloxane polymers mentioned, to give a silicone adhesive with the desired properties, would be fitting with the present subject matter. Non-limiting examples of such compositions which are commercially available include adhesives 7651, 7652, 7657, 2013, Q2-7406, Q2-7566, Q2-7735 and 7956, all available from Dow Chemical (formerly Dow Corning), SilGrip™ PSA 518, 590, 595, 610, 810, 915, 950 and 6574 available from Momentive Performance Materials, and KRT-009 and KRT-026 available from Shin-Etsu Silicone. When applied in an assembly as described herein, the adhesive transfer tape may provide the optical clarity and barrier performance described.

[00123] The silicone based adhesive may additionally include performance modifiers, such as polyorganosiloxane polymers (either reactive or non-reactive) reactive fluids, or resins (either reactive or non-reactive) for glass transition, modulus, adhesion, tack, viscosity or other property modification. Non- limiting examples of such modifiers with are commercially available include Syl-Off® 7075, 2-1912, 2- 7066, 2-7466 all available from Dow Chemical (formerly Dow Corning), SR545 and SR9130 available from Momentive Performance Materials, and KRT-974 available from Shin-Etsu Silicone.

[00124] In many implementations, the adhesive layer of the adhesive transfer tape may comprise a pressure sensitive adhesive (PSA). Pressure sensitive adhesives (PSAs) are adhesives and thermoplastics which in dry (solvent-free) form are permanently tacky at room temperature. PSAs can adhere to a variety of dissimilar surfaces upon contact without the need for manual pressure and do not require activation by water, solvent, or heat to exert a holding force toward a substrate. The cohesive and elastic nature of PSAs allow for handling and removal from smooth surfaces despite their tackiness without leaving a residue. PSAs can be quantitatively described using the "Dahlquist criteria" which maintains that the elastic modulus of these materials is less than 106 dynes/cm2 at room temperature. See Pocius, A. V., Adhesion & Adhesives: An Introduction, Hanser Publishers, New York, N.Y., First Edition, 1997. In some implementations, pressure sensitive adhesives of the adhesive transfer tape may include at least one PSA of acrylic-based PSA's, synthetic rubber-based PSA's, polyurethane-based PSA's, silicone-based PSA's, and hybrid PSA's.

[00125] In some implementations, the adhesive layer of the adhesive transfer tape comprises a substantially acid-free adhesive (also meaning substantially free of acidic components) and/or substantially free of ionic components. In another implementation, the adhesive layer of the adhesive transfer tape comprises a substantially acid-free adhesive that exhibits corrosion resistance or low corrosion to metallic surfaces, either initially or after exposure to heat and humidity (for example, such as aging at 85° C and 85% relative humidity for 500 hours or another aging method described herein). In some implementations, the adhesive layer of the adhesive transfer tape comprises a substantially acid-free adhesive. In some implementations, the adhesive layer of the adhesive transfer tape comprises a substantially acid-free acrylic adhesive. In some implementations, the adhesive layer of the adhesive transfer tape comprises a substantially acid-free acrylic adhesive. In some implementations, the adhesive layer of the adhesive transfer tape comprises a substantially acid-free silicone based adhesive. In some implementations, the adhesive layer of the adhesive transfer tape comprises a substantially acid-free silicone based adhesive. In one implementation, the silicone based adhesives comprise no or limited acid by-products. In some implementations, the adhesive layer of the adhesive transfer tape may be substantially free of ionic character.

[00126] In some implementations, the rheology profile for the Storage Modulus and Loss Modulus-

Frequency may include, for example:

Table 6: Storage Modulus and Loss Modulus Versus Frequencies for an Example Acrylic Adhesive (at Room Temperature (RT) 1.5E4 to 1.0E7 Pa, and 80 °C 8.0E3 to 1.0 E6 Pa)

Figure imgf000044_0001

[00127] In one implementation, the adhesive layer of the adhesive transfer tape may comprise an additive that may provide a desired absorbance property. In another implementation, the adhesive layer of the adhesive transfer tape which may comprise an additive that may absorb at about 9 to about 10 microns. The absorbance additive may provide improved laser cutting capabilities.

[00128] Further, in one implementation, the adhesive transfer tape may comprise a release liner on the adhesive layer. In another implementation, the adhesive transfer tape may further comprise both a first release liner disposed on the adhesive layer and a second release liner disposed on the adhesive layer. In one implementation, the release liner(s) may control the surface topography or minimize the surface roughness of the first adhesive layer and/or second adhesive layer in order provide a lower haze value. Further, in one implementation, the release liner may be optically clear.

[00129] In one implementation, the release liner(s) used in the adhesive transfer tape may comprise films. In one implementation, the release liner(s) may comprise but may not be limited to polyethylene terephthalate. In one implementation, the release liner(s) may comprise polytetrafluoroethylene (PTFE). In one implementation, the release liner(s) used in the adhesive transfer tape may comprise polyester film. Further, in one implementation, the release liner(s) may be optically clear. Additionally, in one implementation, the release liner(s) and the film may be optically clear. One implementation, the release liner(s) may have a release coating.

[00130] In one implementation, the release liner(s) used in the adhesive transfer tape may comprise silicone surface coated films. In another implementation, the release liner(s) used in the adhesive transfer tape may comprise fluorosilicone surface coated films. In some implementations, the thickness of the release liner may not be limited. In some implementations, the thickness of the release liner may be about 25 microns to about 100 micron films in the manufacture of adhesive transfer tape. In some implementations, the specific surface coating type may depend upon the adhesive type selected and the specified release properties of the release liner(s). In some implementations, the release liner is a silicone release liner having an average surface roughness (SA) of about 100 nm or less on the release side. In some implementations, the release liner is a silicone release liner having an average surface roughness (SA) of about 70 nm or less, when measured on the release side. In some implementations, the release liner is a silicone release liner having an average surface roughness (SA) of about 50 nm or less, when measured on the release side. In other implementations, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 125 nm or less, when measured on the release side. In other implementations, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 100 nm or less, when measured on the release side. In some implementations, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 80 nm or less, when measured on the release side. In some implementations, the solvent blend or wetting behavior of the adhesive layer on liner may affect the surface roughness. Further, the surface roughness may be affected by the coating method as a function of complex viscosity (gravure, roll, die coating, etc.). One experienced in the art would recognize that the surface roughness of the release side of the release layer is easily transferred to the gas barrier layer or the adhesive layer when forming the member assembly. One experienced in the art would also recognize that surface roughness can be described in a variety of ways and the actual values measured can be highly influenced by the equipment selected, method used, area of the sample measured, and use of wavelength filters applied to the measurement. Surface roughness, as described herein by the 3D parameters, SA, SQ, and Sz, may be measured by a white light interferometer or optical profiler. Materials herein were tested using a Bruker Contour GT Optical Microscope with a measurement area of 1.26 mm x 0.95 mm. No filtering processes were used for data collection, unless otherwise specified. When a filtering process was applied, the filtering process used a Gaussian regression long cutoff X Y (mm) = 0.6 and short cutoff X Y (mm) = 0.

[00131] SA is a 3D parameter expanded from the roughness 2D parameter RA. It expresses the average of the absolute values of Z(x,y) in the measured area. It is equivalent to the arithmetic mean of the measured region on the 3D display diagram when valleys have been changed to peaks by conversion to absolute values. It is mathematically expressed as SA = 1/A jA.flZ(x,y)ldxdy. SQ is a 3D parameter expanded from the roughness parameter RQ. It expresses the root mean squared of Z(x,y) in the measured area. It is equivalent to the average mean squared of the measured region on the 3D display diagram when valleys have been changed to high peaks by squaring. It is mathematically expressed as SQ = V(l/A z2(x,y)ldxdy).

[00132] When the release layer comprises a fluorosilicone release coating, the average surface roughness, SA, of the release sheet may be about 175 nm or less, and also about 125 nm or less, when measured on the release side. When the release layer comprises a fluorosilicone release coating, the root mean square roughness, SQ, of the release sheet may be 200 nm or less, when measured on the release side. In one embodiment, when filmic release layers are used, optically clear films may be used as the facestock due to their smoothness (lower surface roughness) as compared to non-optically clear films.

Table 7. Example fluorosilicone release layers compared to a standard fluorosilicone release layer.

Figure imgf000046_0001

[00133] When the release layer comprises a silicone release coating, the surface roughness, SA, of the release sheet may be about 100 nm or less, about 70 nm or less, and also about 50 nm or less, when measured on the release side. The root mean square roughness, SQ, of the release sheet may be about 125 nm or less, about 100 nm or less, and also about 80 nm or less, when measured on the release side. In one embodiment, when filmic release layers are used, optically clear films may be used as the facestock in order to provide better smoothness (lower surface roughness) as compared to non-optically clear films.

Table 8. Example preferred silicone release layers compared to standard silicone release layers.

Figure imgf000047_0001

[00134] In other implementations, the release liner may comprise a fluorosilicone release liner. In some implementations, the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 175 nm or less, when measured on the release side. In some implementations, the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 125 nm or less, when measured on the release side. In other implementations, the release liner is a fluorosilicone release liner having a root mean squared roughness (SQ) of about 200 nm or less, when measured on the release side.

[00135] In some implementations, the release liner may comprise optically clear base films. In one implementation, the release liner may comprise optically clear PET. As such, the haze value may be reduced when optically clear films are used. In some implementations, the optically clear films used as the release liner may provide a smoother surface on the first adhesive layer and the second adhesive layer, where the average surface roughness, SA, may be measured by optical profilometry. In one embodiment, the SA of the release liner is about 175 nm or less. In another embodiment, the SA of the release liner is about 100 nm or less. In yet another embodiment, the SA of the release liner is about 70 nm or less.

Further, in some implementations, surface roughness of the release side of the release liner may be transferred to the adhesive layer when forming a member assembly. Further, surface roughness may be provided in a variety of ways, and the actual values measured may be influenced by the equipment selected, method used, area of the sample measured, and use of wavelength filters applied to the measurement. In some implementations, the surface roughness of a release liner may aid in attaining "optical clarity" of an adhesive layer or member assembly since the roughness may be transferred from the liner surface to the surface of an adhesive layer. In one implementation, a comparison of fluorosilicone release coatings and silicone release coatings provided that since fluorosilicones are copolymers with a phase morphology, the inherent morphology may lead to a rougher coating of an adhesive. In another implementation, a comparison of white PET and clear PET provided that white PET may result in a rougher surface of an adhesive when coated with silicone as compared to clear PET. In yet another implementation, a comparison of optically clear PET and standard PET provided that optically clear PET may result in a smoother surface of the adhesive layer.

[00136] Still, surface roughness data may be provided in either a raw data mode or in a "filtered" mode. In a filtered mode, some wavelengths of light are filtered out. Depending upon the nature of the surface defects, some defects may be "hidden" or not observed when filters are used. Therefore, disclosure of surface roughness data in literature without describing the specific method used may not provide a fair comparison of surface roughness data in different samples.

[00137] There may be at least two methods for creating a siliconized release layer on film. In the first method, referred to as an off-line method, silicone may be applied to a "finished" PET. In the second method, referred to as an in-line method, silicone may be applied to an "unfinished" PET, and then the PET is stretched and possibly annealed into a finished form. In some embodiments, the in-line method may yield a siliconized film with a much lower deposition of silicone than off-line since the PET stretching step may also cause the silicone coating to be stretched out.

[00138] In some implementations, release liners that may be used in the embodiments disclosed within may include: 1) silicone or fluorosilicone, where possible, based on the adhesive type used in the assembly; 2) clear or white or otherwise pigmented films; 3) optically clear or standard PET base film; 4) unfiltered surface roughness data may describe the surface roughness of a release layer (if filtered data is used, the filtering mechanism must be disclosed); and/or 5) in-line process liners or off-process liners. In some implementations, the product construction of the optically clear, gas barrier adhesive transfer tape may include the following layers in the noted arrangement below.

Layer 1 : First release liner Layer 2: Adhesive layer

Layer 3: Second release liner (optional)

In some implementations, printing may be added to at least one release liner of the adhesive transfer tape.

[00139] FIGURE 5 schematically illustrates a cross section of an embodiment of an adhesive tape

510 in accordance with what is disclosed herein. The adhesive tape 510 comprises an adhesive layer 70, wherein the adhesive layer comprises a first adhesive face 76 and a second adhesive face 78. The first release liner 72 may be disposed on the first adhesive face 72 of the adhesive layer 70, and the second release liner 74 may be disposed on the second adhesive face 78 of the adhesive layer 70. The outwardly directed face of the first release liner 72 may be shown as first release face 80, and the outwardly directed face of the second release liner 74 may be shown as second release face 82.

[00140] In some implementations, the thickness of the adhesive layer 70 may not be limited such that the WVTR, optical transmission, haze value, and flexibility requirements are met. In one

implementation, the thickness of the adhesive layer 70 may be about 3 microns to about 80 microns. In another implementation, the thickness of the second layer 70 may be about 3 microns to about 30 microns. In yet another implementation, the thickness of the adhesive layer 70 may be about 3 microns to about 16 microns.

METHODS OF ADHESIVE TRANSFER TAPES

[00141] Also disclosed is a method for producing an adhesive transfer tape. In one implementation, a method for producing optically clear adhesive transfer tape is disclosed. In another implementation, the adhesive transfer tape may comprise at least one adhesive. In another implementation, the adhesive transfer tape may comprise the materials disclosed above. In yet another implementation, the adhesive transfer tape may exhibit properties disclosed above.

[00142] In one implementation, the method of producing adhesive transfer tapes comprising at least partially coating at least a portion of a release surface of a release liner with an adhesive layer. In many embodiments, the methods for producing an adhesive transfer tape may comprise certain steps that may be added, removed, altered, or executed in a different order.

[00143] In one implementation, a method of producing an adhesive transfer tape comprises at least partially coating at least a portion of a first release liner with a first face of an adhesive layer, wherein the adhesive transfer tape described herein is produced. In one implementation, at least a portion of the release liner may be coated with the adhesive layer. In one implementation, the method may further comprise disposing at least a portion of a second face of the adhesive layer with a second release liner. In one implementation, the method may include coating at least a portion of the surface of the release liner with the adhesive layer and at least partially laminating the adhesive layer on the second release face of the second release liner.

[00144] In one implementation, the method for producing the adhesive transfer tape may further comprise winding the adhesive transfer tape into a roll. In one implementation, winding the roll may include the following components: the release liner, the adhesive layer, and an optional additional (or second) release liner.

[00145] In another implementation, the method for producing the adhesive transfer tape may further comprise providing the adhesive transfer tape in sheets.

[00146] In one implementation, the first layer may be applied by conventionally known coating methods, including but not limited to a gravure roll coater, a micro-gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, a spray coater, and a die coater. In some implementations, certain coating techniques may be more suited to coating specific adhesive compositions (e.g. acrylic based adhesives, silicone based adhesives, etc.) and/or specific forms of adhesive compositions (e.g. solvent vs. solvent-free). In some implementations, certain coating techniques may also be more suited to obtain certain adhesive thicknesses and high optically clarity (low haze value).

[00147] In one implementation, the adhesive(s) in the adhesive layer may be filtered prior to forming the adhesive layer. In another implementation, process conditions may be selected to minimize wrinkling, scratching, bubbling, blistering, orange peel, or other possible defects that may occur to the adhesive layer, the release liner, and any additional release liners (also referred to as the second release liner).

[00148] In one embodiment, the method for producing the adhesive transfer tape may include manufacturing the optically clear, gas barrier adhesive transfer tape in a class 10,000 cleanroom or lower. In another implementation, the adhesive transfer tape may be manufactured in a class 1 ,000 cleanroom or lower. In yet another implementation, the adhesive transfer tape may be manufactured in a class 1 cleanroom environment.

MEMBER ASSEMBLY OF THE ADHESIVE TRANSFER TAPE

[00149] The member assembly 610 may comprise at least one member 600 and at least one adhesive transfer tape. The member assembly 610 may comprise at least one member 600 and at least one adhesive layer. The member assembly 610 may comprise: 1) the member 600 comprising a surface; 2) the adhesive transfer tape disposed on the surface of the member 600, the transfer tape comprising: an adhesive layer comprising a first face and a second face opposite the first face; and at least one release liner disposed on at least one of the first face and the second face of the adhesive layer; the adhesive transfer tape having: a total light transmittance of at least about 85% within the visible spectrum; a haze value of about 3% or less; a water vapor transmission rate (WVTR) of about 500 g/m2/day or less at about 45 °C/100% RH; and a thickness of the adhesive transfer tape about 25 microns or less.

[00150] FIGURE 6 schematically illustrates a member assembly 610 comprising a member 600 having the adhesive transfer tape disposed on the member 600, in which the adhesive transfer tape comprises an adhesive layer 70, and a second release liner 74.

[00151] In one implementation the member 600 may comprise at least one member of an electronic member and an optical member. In one implementation, the member 600 may be an electronic member. In another implementation, the member 600 may comprise an optical member. In another implementation, the member 600 may comprise another substrate material which may comprise, but not limited to, metal, plastic, glass, fabric, composite, liquid crystalline polymer, and/or other materials. In yet another implementation, the member 600 may also comprise at least one of: 1) OLED layers; 2) sensor layers: 3) AMOLED layers; and 4) quantum dots. In one implementation, the member 600 may comprise various lighting sources, including but not limited to OLED encapsulation. In one implementation, the member 600 may comprise one substrate material. In another implementation, the member 600 may include more than one substrate material.

[00152] In another implementation, the member assembly 610 may comprise the optically clear adhesive transfer tape and at least one member 600. In one implementation, the member assembly 610 may include at least one adhesive transfer tape with gas barrier properties. In another implementation, the member assembly 610 may include an adhesive transfer tape that may comprise an adhesive. In one implementation, the member assembly 610 may include at least one adhesive comprising acrylic based adhesives, rubber based adhesives, polyurethane based adhesives, silicone based adhesives, and hybrid adhesives. In another implementation, the member assembly 610 may include the adhesive transfer tape comprising materials described herein. In one implementation, the member assembly 610 may exhibit corrosion resistance or low corrosion. In another implementation, the member assembly 610 may include an adhesive transfer tape that is substantially free of acidic components and/or ionic components. In yet another implementation, the member assembly 610 may be highly flexible, bendable, and conformable. In one implementation, the member assembly 610 may include an adhesive transfer tape with the properties of implementations of the adhesive transfer tape described herein.

[00153] In one implementation, the member assembly 610 may comprise at least one member 600 disposed or adhered to at least one portion of the adhesive transfer tape as previously described herein. In one implementation, the member assembly 610, having a surface, may be disposed along the adhesive layer 70 of the adhesive transfer tape.

[00154] Although what is illustrated in FIGURE 6 provides a single member assembly 610, at least one additional member assembly may be disposed on the member assembly 610 to provide a multi layered stacked assembly. In one implementation, at least one additional member assembly may be disposed on the member assembly 610.

[00155] FIGURE 7 schematically illustrates a substrate assembly 710 comprising the member 600, the adhesive layer 70, and a substrate 700 to which the adhesive layer 70 may be disposed. The adhesive layer 70 of the adhesive transfer tape may be at least partially in contact with and disposed to the surface 702 of the substrate 700. Although what is illustrated in FIGURE 7 provides a single substrate assembly 710, at least one additional member assembly 610 may be disposed on the member assembly 610 to provide a multi layered stacked substrate assembly.

ADHESIVE LAYER

[00156] Additionally, an adhesive layer may comprise at least one adhesive having: a total light transmittance of at least about 85% within the visible spectrum; a haze value of about 3% or less; a water vapor transmission rate (WVTR) of about 500 g/m2/day or less at about 45 °C/100% RH; and a thickness of the adhesive of about 100 microns or less. The adhesive in the adhesive layer may comprise at least one adhesive of acrylic based adhesives, rubber based adhesives, polyester based adhesives, polyurethane based adhesives, silicone based adhesives, and hybrid adhesives. The adhesive in the adhesive layer may also comprise a pressure sensitive adhesive. In one implementation, the adhesive in the adhesive layer may be substantially free of acidic components. In one implementation, the adhesive in the adhesive layer may be substantially free of ionic components, such that, in one implementation, the adhesive may be neutralized by titration with about 10 mg or less of potassium hydroxide per gram of adhesive.

[00157] In one implementation, the adhesive may have a total light transmittance of at least about

90%. In another implementation, the adhesive may have a light transmittance of about 10% or less at about 380 nm. In another implementation, the adhesive may have a light transmittance of about 5% or less at about 380 nm. In another implementation, the adhesive may have a light transmittance of about 1% or less at about 380 nm.

[00158] In one implementation, the adhesive may have a haze value is about 1% or less. In another implementation, the adhesive may have a haze value is about 0.5% or less.

[00159] In one implementation, the member assembly comprising the adhesive may exhibit corrosion resistance or low corrosion to metallic surfaces. In some implementations, the adhesive exhibits corrosion resistance or low corrosion to metallic surfaces after aging the member assembly for 500 hours at about 65 °C temperature and about 90% relative humidity. In another implementation, the member assembly comprising the adhesive may exhibit corrosion resistance or low corrosion to metals, metal oxides, and metal alloys. In another implementation, the member assembly comprising the adhesive may exhibit corrosion resistance or low corrosion to at least one metal of copper, tin, aluminum, and indium tin oxide. In another implementation, the member assembly comprising the adhesive may exhibit corrosion resistance or low corrosion to lighting sources. In some implementations, the member assembly comprising the adhesive may exhibit corrosion resistance or low corrosion to at least one of OLED encapsulation, AMOLED encapsulation, and quantum dots. In one implementation, the adhesive may exhibit low resistivity.

[00160] In one implementation, the adhesive may have a dielectric constant of about 2 to about 6.

In another implementation, the adhesive may have a dielectric constant of about 2.5 to about 3.5. In one implementation, the adhesive may have a refractive index of about 1.25 to about 1.80 at about 25 °C. In another implementation, the adhesive may have a refractive index of about 1.35 to about 1.60 at about 25 °C. The pressure sensitive adhesive sheet wherein the pressure sensitive adhesive layer has a reflectance color of (a,b) may be about (+/- 1.0, +/- 1.0). The pressure sensitive adhesive sheet wherein the pressure sensitive adhesive layer has a reflectance color of (a) may be about +/- 1.0. The pressure sensitive adhesive sheet wherein the pressure sensitive adhesive layer has a reflectance color of (b) may be about +/- 1.5. Further, the adhesive may comprise at least one corrosion resistance additive. In one implementation, the corrosion resistance additive may comprise benzophenone. In one implementation, the corrosion resistance additive may comprise triazine. In one implementation, the corrosion resistance additive may comprise benzotriazole. In one implementation, the corrosion resistance additive may comprise hindered amine light stabilizers. In one implementation, the corrosion resistance additive may comprise combinations of corrosion resistance additives described above. In some implementations, the adhesive comprises about 0.1% to about 10% corrosion resistance additive by weight. In some implementations, the adhesive comprises about 0.1% to about 3.5% corrosion resistance additive by weight.

[00161] In other implementations, the adhesive may have a thickness of the adhesive of about 30 microns or less. In another implementation, the adhesive may have a thickness of the adhesive of about 15 microns or less. In yet another implementation, the adhesive may have a thickness of the adhesive of about 5 microns or less.

[00162] Additionally, the adhesive layer may be highly flexible, bendable, and/or conformable (as described herein using the Bendability Test where the adhesive layer is visually checked for cracking, change in haze, and other defects from testing).

[00163] In other implementations, the adhesive in the adhesive layer may have a peel adhesion of at least 0.1 N/mm to glass, PMMA, Al, Cu, or PET. In some implementations, the adhesive in the adhesive layer may have a peel adhesion of at least 0.3 N/mm to glass, PMMA, Al, Cu, or PET. In yet another implementation, the adhesive in the adhesive layer may have a peel adhesion of at least 0.5 N/mm to glass, PMMA, Al, Cu, or PET.

[00164] In one implementation, the adhesive in the adhesive layer may have an impact tensile of at least 10 mJ/cm2. In another implementation, the adhesive in the adhesive layer may have an impact tensile of at least 20 mJ/cm2. In one implementation, the adhesive in the adhesive layer may have an impact tensile of at least 35 mJ/cm2.

[00165] In one implementation, the adhesive in the adhesive layer may have an impact shear of at least 0.01 J/ cm2. In another implementation, the adhesive in the adhesive layer may have an impact shear of at least 0.05 J/ cm2. In one implementation, the adhesive in the adhesive layer may have an impact shear of at least 0.1 J/ cm2.

[00166] Further, the adhesive in the adhesive layer may not exhibit a performance change by more than about 10% after aging for about 500 hours at about 65 °C and about 90% relative humidity. In some embodiments, the adhesive in the adhesive layer may comprise a pressure sensitive adhesive layer. In one implementation, the adhesive layer may comprise a silicone pressure sensitive adhesive. In another implementation, the adhesive layer may comprise a silicone adhesive that is an addition curable silicone based adhesive. In another implementation, the adhesive layer may comprise a silicone adhesive that is a silicone adhesive gel. The silicone adhesive may comprise an additive that promotes corrosion resistance or low corrosion and/or provides a UV cutting property. In another implementation, the adhesive may be polyisobutylene (PIB) wherein the PIB is at least part of a butyl-based adhesive. In some implementations, the PIB may be functionalized. [00167] In some embodiments, the adhesive may comprise a corrosion resistance or low corrosion additive. In some embodiments, the corrosion resistance additive may comprise benzophenone, triazine, benzotriazole, hindered amine light stabilizers, and combinations thereof. In one implementation, the additive that promotes corrosion resistance or low corrosion and/or provides a UV cutting property may comprise about 0.1% to about 3.5% by weight of the silicone adhesive. Further, the adhesive layer may have a certain storage modulus.

[00168] In another implementation, the adhesive layer may comprise an acrylic adhesive. The composition of the acrylic adhesive is not limited, but may be chosen for to provide the optical clarity, barrier properties, corrosion resistance, and other properties. The acrylic adhesive may comprise an additive that promotes corrosion resistance or low corrosion and/or provides a UV cutting property. In some embodiments, the corrosion resistance additive may comprise benzophenone, triazine, benzotriazole, hindered amine light stabilizers, and combinations thereof. In one implementation, the additive that promotes corrosion resistance or low corrosion and/or provides a UV cutting property may comprise about 0.1% to about 10% by weight of the acrylic adhesive. In one implementation, the additive that promotes corrosion resistance or low corrosion and/or provides a UV cutting property may comprise about 3.0% to about 8.0% by weight of the acrylic adhesive. Further, the adhesive layer may have a certain storage modulus.

[00169] In another implementation, the adhesive layer may comprise a rubber based adhesive. The rubber pressure sensitive adhesive may be a synthetic rubber based adhesive. The synthetic rubber based adhesive may include a copolymer of styrene and isoprene or styrene and butadiene. In one implementation, the rubber based adhesive may include a linear, branched, or radial block copolymer. In one implementation, the rubber based adhesive may include a polymodal asymmetric radial block copolymer. Further, the adhesive may be in the form of an adhesive transfer tape, double-sided tape, or multi-layer tape.

NON-LIMITING EXAMPLES

[00170] Example 1 - Preparation of Pressure-sensitive adhesive layer forming solution with

Silicone:

The addition cure silicone adhesive was mixed with a platinum catalyst, corrosion resistance additive (optional), and solvent to the desired percent of solids. This mixture provides a silicone pressure-sensitive adhesive composition. The adhesive percent of solids can be modified using as solvent Toluene or mixtures of Toluene and Methyl ethyl ketone (MEK). Alternatively, the percent solids maybe modified using a reactive diluent. A pressure sensitive adhesive layer-forming solution is referred as "Pressure sensitive adhesive layer A." The silicone pressure sensitive adhesive was applied on a fluorosilicone release 1- treated surface of a polyethylene terephthalate liner (PET), then heated and dried at 150° C for 4 minutes to provide a pressure-sensitive adhesive sheet so that the thickness after drying became 10 μπι.

Barrier film:

Cyclo-olefin Polymer (COP) ZeonorFilm ZF14-013 manufactured by ZEONEX®

HydroBlock® P-Series TR Film P600TR manufactured by Honeywell

[00171] Example 2 - Preparation of a Double Sided Adhesive Tape

A double sided pressure sensitive adhesive construction was prepared by transferring the pressure sensitive adhesive layer obtained onto one side of an optical clear barrier film ZF14-013 of 12 μπι in thickness (Total light transmittance of 91%T @ 380 nm, haze value 0.15%) and further transferring the pressure sensitive adhesive layer onto the other side in the same manner. Thickness of pressure sensitive adhesive layer is 10 μπι each side. The double sided pressure sensitive adhesive construction was prepared by transferring the pressure sensitive adhesive sheet A or A' obtained onto one side of an optical clear barrier film P600TR of 16 μπι in thickness (Total light transmittance of 91%T @ 380 nm, haze value 0.25%) and further transferring the pressure sensitive adhesive layer onto the other side in the same manner. Thickness of pressure sensitive adhesive layer is 10 μπι each side.

[00172] Example 3 - Preparation of a Pressure-sensitive adhesive layer forming solution B' (with additives)

A pressure sensitive adhesive composition was prepared by mixing the acrylic based pressure sensitive adhesive with the targeted amount of corrosion resistance additive (see Table 7 below) and mixed with solvent to the desired percent of solids.

[00173] For both Pressure sensitive sheet B and B'- Transfer Tape, the acrylic pressure sensitive adhesive was applied on a silicone release 1 -treated surface of a polyethylene terephthalate liner (PET), then heated and dried at 120° C for 10 minutes to provide a pressure-sensitive adhesive sheet so that the thickness after drying became 10 μπι.

Barrier film:

Cyclo-olefin Polymer (COP) ZeonorFilm ZF14-013 manufactured by ZEONEX®

HydroBlock® P-Series TR Film P600TR manufactured by Honeywell [00174] A double sided pressure sensitive adhesive construction was prepared by transferring the pressure sensitive adhesive layer obtained onto one side of an optical clear barrier film ZF14-013 of 12 μπι in thickness (Total light transmittance of 91%T @ 380 nm, haze value 0.15%) and further transferring the pressure sensitive adhesive layer onto the other side in the same manner. Thickness of pressure sensitive adhesive layer is 10 μπι each side.

[00175] A double sided pressure sensitive adhesive construction was prepared by transferring the pressure sensitive adhesive sheet A or A' obtained onto one side of an optical clear barrier film P600TR of 16 μπι in thickness (Total light transmittance of 91%T @ 380 nm, haze value 0.25%) and further transferring the pressure sensitive adhesive layer onto the other side in the same manner. Thickness of pressure sensitive adhesive layer is 10 μπι each side.

[00176] The materials used in this and the other examples are summarized below in the Tables.

[00177] Table 9 below provides shows a summary of the properties of the optical clear barrier film and the pressure sensitive optical clear double sided barrier construction using silicone and acrylic adhesive without a corrosion resistance additive.

TABLE 9-Test Samples

Properties Avery P600TR ZF14-013 DC P600TR DC DC with

Dennison Neat Neat film Si Adhesive A P600TR ZF14-013 Test Method film Si Si Adhesive B

Adhesive

B

Thickness Ellipsometer 16 14 35 35 37

(um)

WVTR 45°C/100% 1.1+ 1 32+ 1 2.0 + 1 1.0 + 1 31 + 1 (g/m2.day) RH

Haze at 25°C BYK-Garnder 0.25 0.15 1.67 0.34 0.35

(%) Haze Meter Haze after 65°C,90%RH/ 0.4 0.23 1.55 0.39 0.37 aging (%) 500 h

% Perkin Elmer 91%T 91%T 91%T 91%T 91%T

Transmittance Lambda 25 @380nm @380nm, @380nm, @380nm, @380nm, at 25°C , 91%T 91%T @ 91%T @ 91%T @ 91%T @

@ 400nm 400nm 400nm 400nm 400nm

Peel (N/mm) 12in/min, NA NA rT:0.17 ± 0.05 rT:0.33 ± rT:0.25± 0.04 Glass 96.5umPET 85C: 0.30 ±0.18 0.05

85C:0.32

±0.45

Dielectric ASTM D150 2.60 2.30 2.46 2.92 Constant

[00178] Next, haze was measured following ASTM D1003 using the Haze-Gard Plus haze meter manufactured by BYK-Gardner, USA. For haze measurements, samples were cut to a size large enough to cover the entrance port of the integrating sphere. Sample size was at-least 2 inches x 2 inches (3.1 cm x 3.1 cm).

[00179] Using the double coated pressure sensitive adhesives sheets obtained in the example description haze measurements were conducted. Values were recorded for samples initially and after the tape is subjected to heat aging about 500 hours at about 65 °C and about 95% relative humidity.

[00180] Table 10 below provides results of the double coated construction using ZeonorFilm ZF14-

013 and acrylic adhesive or silicone adhesive with the corrosion resistance additives. The optical clarity of the pressure sensitive adhesive barrier tape may be within about 10% or less of the original haze value after heat aging, regardless of adhesive chemistry. In some examples, the difference in the haze value after aging may be higher than 10% as long as the haze value remains less than about 1%. The corrosion resistance additives type is as follows: A=HALS; B=Oxanilide; C=Triazine; D=Benzophenone; E=Benzotriazole; and F=Cyanoacrylate. TABLE 10- Haze

Figure imgf000059_0001

[00181] WVTR was measured following ASTM F1249 using Permatran Model 3/33 manufactured by MOCON Inc, USA. For WVTR measurements, samples were cut to a size large enough so as to expose 5.00 cm2 or 50.00 cm2 of the sample's surface to the permeant. The samples included both double coated tapes (acrylic or silicone PSA double coated on a ZeonorFilm ZF014-13 barrier film or a P600TR PCTFE film) and transfer tapes. For double coated tapes, the release liners were removed prior to sample loading. For transfer tapes, the adhesive was laminated onto a 'holder' film whose WVTR was higher than the WVTR of the adhesive - therefore - effectively acting as a medium to support the adhesive and providing little to none water vapor barrier. Measurements were taken at conditions of 45°C and 100% Relative Humidity.

[00182] Table 11 below provides some examples of adhesive transfer tapes and double coated adhesive tape construction correlation of thickness with WVTR. TABLE 11 - WVTR

Figure imgf000060_0001

[00183] Using the double coated pressure sensitive adhesives sheets obtained in the example description, the dielectric constant was measured by ASTM D150, frequencies IKHz- IMHz. Values were recorded for samples initially and after the tape is subjected to heat aging about 500 hours at 65 °C and 95% relative humidity.

[00184] Table 12 provides examples of the pressure sensitive double coated tape with the dielectric constant about 2.8 to about 4, even after heat aging. The variation of the dielectric constant of the pressure sensitive adhesive barrier tape is less than 10% of the original dielectric constant value after heat aging. The variation of the dielectric constant of the pressure sensitive adhesive barrier tape is less than 10% after the addition of the corrosion resistance additive. TABLE 12-Dielectric Constant

Figure imgf000061_0001

[00185] Additionally, % Transmission was measured using the Lambda 35 spectrophotometer manufactured by Perkin Elmer, USA. For the measurements, samples were cut to a size to ensure that the radius of the incident beam completely falls within the sample. Typically, sample size was at-least 2 in x 2 in (3.1 cm x 3.1 cm). For all the barrier tapes (acrylic or silicone PSA double coated on a barrier film) disclosed in this document, the %T in the visible region (400 - 800 nm) was at least 85%. The change in %Transmission of the barrier tapes, after aging at 65°C and 90% Relative Humidity, was < 10%.

[00186] For peel performance testing, modified ASTM D-3330 adhesion to glass. Tape was laminated to 96.5um PET. Table 13 shows the peel adhesion performance of optical clear barrier tape double coated pressure sensitive adhesive with different chemistries, and Table 14 shows peel adhesion performance of addition curing silicone PSA at different drying conditions.

TABLE 13- Peel Adhesion

180° Adhesion (N/cm)

Dwell Time: 72 Hour

Speed: 12 in/min

Example Average Failure Mode Double Coated Tape on P600TR using Silicone A 1.74 Clean

Double Coated Tape on P600TR using Silicone B 3.39 Clean

Double Coated Tape on P600TR using Acrylic 2.58 Clean

adhesive

TABLE 14-Peel Adhesion

Figure imgf000062_0001

[00187] Table 15 below shows impact of performance of corrosion resistance additive in peel adhesion.

TABLE 15 - Corrosion Resistance*

180° Adhesion (%)*

Dwell Time: 72 Hours Speed: 12 in/min

Silicone adhesive B no additive 100

Silicone adhesive B with corrosion resistance additive E 78

Silicone adhesive B with corrosion resistance additive D 236

*Values Normalized respect to value from adhesion to Silicone Adhesive B with no additive

[00188] The bending test for measuring flexibility, bendability, and conformability was also used.

The effect of repeated mechanical deformation on the optical clarity of double -coated tapes was evaluated in the following way. The tapes (here, tapes refer to a double coated construction of Si or Acrylic PSA laminated on both sides of a COP film with fluoro-Si or Si release liners respectively) were cut into rectangular strips of 5 in x 2 in and mounted onto a custom-built bending device that bends the tape for 4 hours at 40 bends per minute so as to deform a 2 in x 2 in area of the tape with bending angle of about 180 degrees. The experiments were conducted at room temperature. The optical clarity - evaluated in terms of haze - was measured before and after the repeated bending. For materials subjected to the bending test, haze was measured in the portion of the tape that conformed around the 4mm post. For all the samples that were tested, the change in haze due to continuous bending was less than < 10%. Cracking and other surface defects were also checked by visual inspection.

[00189] The ability of the barrier tapes (Si or Acrylic PSA double coated on a COP film) and the

PSA to prevent corrosion of copper under elevated temperature and humidity was evaluated in the following way. In the corrosion on copper test, the copper (measuring 10 mm x 5 mm x 0.5 mm), placed onto a clear glass slide (Fisherbrand 1 mm thick microscope slides), was laminated with the tape (or PSA) after removal of all release liners. The surface area of the tape (or PSA) was larger than the surface area of the copper. Following lamination, the sample was allowed to dwell at room temperature for 12 hours to allow complete wet out of the adhesives. The samples were then placed at 65°C, 90% RH for 500 hours in a custom built sample holder to prevent any contact (with oven's sample trays etc.,) that might lead to false negatives. The extent corrosion of copper on the aged samples was studied by visual inspection through an optical microscope equipped with a 20x objective and visible light source in reflection mode. The degree of corrosion was categorized as Slight to None, Mild, or Severe depending on the extent of discoloration / spotting observed on the surface of the copper. Furthermore, the 'rate' of corrosion was also evaluated by visual inspection of the samples as a function of time. Table 16 below provides results for an optical clear barrier acrylic transfer tape pressure sensitive adhesive with addition of corrosion resistance additive at 5% w/w percent from adhesive.

TABLE 16 - Corrosion on Cu

Figure imgf000064_0001

[00190] Table 17 below provides some results for an optical clear barrier acrylic transfer tape pressure sensitive adhesive with a combination of corrosion resistance additives at various w/w percent from adhesive. Components of Example and Comparative Example reported as weight dry percent of each formulation.

[00191]

TABLE 17 - Corrosion on Cu

Sample Additives % Corrosion in Cu surface after 500h aging @65C and 90 Rh

1 A + C < 3 Severe

2 A + C < 4 Severe

4 A + E < 3 Mild

5 A + E < 5 Slight to none [00192] Table 18 below provides results for an optical clear barrier acrylic transfer tape and double coated pressure sensitive adhesive with a combination of corrosion resistance additive at various w/w percent from adhesive. Components of Example and Comparative Example reported as weight dry percent of each formulation. Double coated constructions were made using ZF14-013 optical clear barrier film.

TABLE 18 - Corrosion on Cu

Figure imgf000065_0001

[00193] Table 19 below provides results for an optical clear barrier silicone transfer tape pressure sensitive adhesive with addition of corrosion resistance additive at different w/w percent from adhesive.

TABLE 19- Corrosion on Cu

Figure imgf000065_0002

[00194] Table 20 below provides results for an optical clear barrier silicone transfer tape and double coated pressure sensitive adhesive with a combination of corrosion resistance additive at various w/w percent from adhesive. Components of Example and Comparative Example reported as weight dry percent of each formulation. Double coated constructions were made using ZF14-013 optical clear barrier film.

TABLE 20 -Corrosion on Cu

Figure imgf000066_0002

[00195] Table 21 below provides an example of a cure profile by DSC for addition cured silicone with various additives.

[00196]

Table 21 -Cure Profile

Figure imgf000066_0001
[00197] Tables 22-A through 22-E below provides liner data results for optical clarity in release liners, as described herein.

TABLE 22-A - Silicone versus Fluorosilicone (unfiltered roughness data)

Figure imgf000067_0001

Table 22-B - Clear PET versus White PET (unfiltered roughness data)

Figure imgf000067_0002

Table 22-C - Optically Clear versus Standard PET (unfiltered roughness data)

Figure imgf000067_0003

Table 22-D - Unfiltered versus Filtered Data

Filter Sa (nm) Sq (nm)

Fluorosilicone

1 No 205.0 +/- 23.8 261.3 +/- 35.0

Fluorosilicone

1 Yes 115.6 +/- 23.5 165.3 +/- 22.7

Silicone 1 No 112.3 +/- 8.5 146.0 +/- 7.2 Silicone 1 Yes 52.1 +/- 1.9 83.2 +/- 1.5

Silicone 2 No 96.6 +/- 22.9 121.8 +/- 28.3

Silicone 2 Yes 43.6 +/- 2.1 59.4 +/- 2.7

Table 22-E - In -Line Process versus Off-line Process for Siliconization (unfiltered roughness data)

Figure imgf000068_0001

[00198] The present subject matter includes all operable combinations of features and aspects described herein. Thus, for example if one feature is described in association with an embodiment and another feature is described in association with another embodiment, it will be understood that the present subject matter includes embodiments having a combination of these features. While the present subject matter has been shown and described with respect to detailed embodiments thereof, it will be understood by those skilled in the art that changes in form and detail thereof may be made without departing from the scope of the claimed subject matter.

Claims

WHAT IS CLAIMED IS:
1. An double sided adhesive tape comprising:
an optically clear gas barrier layer comprising a first face and a second face opposite the first face;
a first adhesive layer disposed on the first face; and
a second adhesive layer disposed on the second face;
the double sided adhesive tape having:
a total light transmittance of at least about 85% within the visible spectrum;
a haze value of about 3% or less;
a water vapor transmission rate (WVTR) of about 35 g/m2/day or less at about 45 °C/100% RH; and
a thickness of the double sided adhesive tape of about 100 microns or less.
2. The double sided adhesive tape of Claim 1 further comprising a release liner disposed on at least one of the first adhesive layer and the second adhesive layer.
3. The double sided adhesive tape of any one of Claims 1-2 further comprising:
a first release liner disposed on the first adhesive layer; and
a second release liner disposed on the second adhesive layer.
4. The double sided adhesive tape of any one of Claims 1-3, wherein the thickness of the double sided adhesive tape is about 40 microns or less.
5. The double sided adhesive tape of any one of Claims 1-4, the double sided adhesive tape having a water vapor transmission rate (WVTR) of about 3 g/m2/day or less at about 45° C/100% RH.
6. The double sided adhesive tape of any one of Claims 1-5, the double sided adhesive tape having a water vapor transmission rate (WVTR) of about 0.3 g/m2/day or less at about 45 °C/100% RH.
7. The double sided adhesive tape of any one of Claims 1-6, the double sided adhesive tape having a total light transmittance of at least about 90%.
8. The double sided adhesive tape of any one of Claims 1-7, the double sided adhesive tape having a haze value of about 1 % or less.
9. The double sided adhesive tape of any one of Claims 1-8, the double sided adhesive tape having a haze value of about 0.5% or less.
10. The double sided adhesive tape of any one of Claims 1-9, wherein the double sided adhesive tape exhibits corrosion resistance or low corrosion to metallic surfaces after aging the member assembly for 500 hours at about 65 °C temperature and about 90% relative humidity.
1 1. The double sided adhesive tape of any one of Claims 1-10, wherein the double sided adhesive tape is (i) highly flexible, (ii) bendable, and (iii) conformable.
12. The double sided adhesive tape of Claim 2, wherein the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 175 nm or less.
13. The double sided adhesive tape of Claim 2, wherein the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 125 nm or less.
14. The double sided adhesive tape of Claim 2, wherein the release liner is a fluorosilicone release liner having a root mean squared roughness (SQ) of about 200 nm or less.
15. The double sided adhesive tape of Claim 2, wherein the release liner is a silicone release liner having an average surface roughness (SA) of about 70 nm or less.
16. The double sided adhesive tape of Claim 2, wherein the release liner is a silicone release liner having an average surface roughness (SA) of about 50 nm or less.
17. The double sided adhesive tape of Claim 2, wherein the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 125 nm or less.
18. The double sided adhesive tape of Claim 2, wherein the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 100 nm or less.
19. The double sided adhesive tape of any one of Claims 1-1 1 , wherein the thickness of each of the first adhesive layer and the second adhesive layer is within a range of from about 3 microns to about 30 microns.
20. The double sided adhesive tape of any one of Claims 1-1 1 and 19, wherein both the first adhesive layer and the second adhesive layer are substantially free of acidic components and/or ionic components.
21. The double sided adhesive tape of any one of Claims 1-1 1 and 19-20, wherein at least one of the first adhesive layer and the second adhesive layer comprises at least one adhesive of acrylic based adhesives, rubber based adhesives, polyester based adhesives, polyurethane based adhesives, silicone based adhesives, and hybrid adhesives.
22. The double sided adhesive tape of any one of Claims 1-1 1 and 19-21 , wherein at least one of the first adhesive layer and the second adhesive layer comprises a pressure sensitive adhesive.
23. The double sided adhesive tape of any one of Claims 1-1 1 and 19-22, wherein at least one of the first adhesive layer and the second adhesive layer comprises a substantially acid-free acrylic adhesive.
24. The double sided adhesive tape of any one of Claims 1-1 1 and 19-22, wherein at least one of the first adhesive layer and the second adhesive layer comprises a silicone based adhesive.
25. The double sided adhesive tape of any one of Claims 1-1 1 and 19-22, wherein both the first adhesive layer and the second adhesive layer comprise silicone based adhesives.
26. The double sided adhesive tape of any one of Claims 1-11 and 19-22, wherein the first adhesive layer comprises an acrylic based adhesive and the second adhesive layer comprises a silicone based adhesive.
27. The double sided adhesive tape of any one of Claims 1-11 and 19-22, wherein at least one of the first adhesive layer and the second adhesive layer is an addition curable silicone based adhesive.
28. The double sided adhesive tape of any one of Claims 1-11, 19-22, and 27, wherein at least one of the first adhesive layer and the second adhesive layer further comprises at least one corrosion resistance additive.
29. The double sided adhesive tape of Claim 28, wherein the corrosion resistance additive comprises benzophenone.
30. The double sided adhesive tape of Claim 28, wherein the corrosion resistance additive comprises triazine.
31. The double sided adhesive tape of Claim 28, wherein the corrosion resistance additive comprises benzotriazole.
32. The double sided adhesive tape of Claim 28, wherein the corrosion resistance additive comprises hindered amine light stabilizers.
33. The double sided adhesive tape of any one of Claims 1-11, 19-22, 27, and 28, wherein the thickness of the optically clear gas barrier layer is about 3 microns to about 80 microns.
34. The double sided adhesive tape of Claim 33, wherein the thickness of the optically clear gas barrier layer is about 3 microns to about 30 microns.
The double sided adhesive tape of any one of Claims 1-11, 19-22, 27, and 28, wherein the optically clear gas barrier layer is a single layer film.
36. The double sided adhesive tape of any one of Claims 1-11, 19-22, 27, and 28, wherein the optically clear gas barrier layer is a multi-layer film.
37. The double sided adhesive tape of any one of Claims 1-11, 19-22, 27, and 28, wherein the optically clear gas barrier layer comprises an atomic layer deposition (ALD) coating with at least one inorganic compound.
38. The double sided adhesive tape of any one of Claims 1-11, 19-22, 27, and 28, wherein the optically clear gas barrier layer comprises at least one of cyclic olefin polymer (COP), polyethylene naphthalene (PEN), polychlorotrifluoroethylene (PCTFE), polyethylenefluoroethylene (PETFE), polyvinylidene chloride (PVDC), polytetrafluoroethylene (PTFE), norbornene, polyacrylonitrile, polyisobutylene (PIB), and combinations thereof.
39. The double sided adhesive tape of Claim 38, wherein polyisobutylene (PIB) is at least part of a butyl-based adhesive.
40. The double sided adhesive tape of Claim 38, wherein polyisobutylene (PIB) is functionalized.
41. The double sided adhesive tape of any one of Claims 1-11, 19-22, 27, and 28, wherein the optically clear gas barrier layer comprises a treatment or TIE layer comprising polyisobutylene (PIB).
42. The double sided adhesive tape of Claim 41, wherein the polyisobutylene (PIB) is functionalized.
43. A method of producing a double sided adhesive tape comprising:
coating at least a portion of a first release liner with a first adhesive layer; providing an optically clear gas barrier layer comprising a first face and a second face opposite the first face; at least partially laminating the first adhesive layer on the first face of the optically clear gas barrier layer;
coating at least a portion of a second release liner with a second adhesive layer; and at least partially laminating the second adhesive layer on the second face of the optically clear gas barrier layer.
44. The method of Claim 43 further comprising:
winding the double sided adhesive tape into a roll.
45. The method of any one of Claims 43-44, wherein the method is performed using at least one coater of a gravure roll coater, a micro-gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, a spray coater, and a die coater.
46. The method of any one of Claims 43-45, wherein the optically clear gas barrier layer comprises an atomic layer deposition (ALD) coating with at least one inorganic compound formed by at least one technique of atomic layer deposition, vacuum deposition, sputtering, ion plating, and chemical vapor deposition.
47. The method of any one of Claims 43-46, wherein the double sided adhesive tape of Claim 1 is produced.
48. A member assembly comprising:
a member comprising a surface;
a double sided adhesive tape disposed on the surface of the member, the double sided adhesive tape comprising:
(i) an optically clear gas barrier layer comprising a first face and a second face opposite the first face;
(ii) a first adhesive layer disposed on the first face; and
(iii) a second adhesive layer disposed on the second face;
the double sided adhesive tape having:
a total light transmittance of at least about 85% within the visible spectrum; a haze value of about 3% or less;
a water vapor transmission rate (WVTR) of about 35 g/m2/day or less at about 45 °C/100 RH; and
a thickness of the double sided adhesive tape about 100 microns or less.
49. The member assembly of Claim 48, wherein the member is at least one member of an electronic member and an optical member.
50. The member assembly of any one of Claims 48-49 further comprising at least one additional member assembly disposed on the member assembly.
51. The member assembly of any one of Claims 48-50, wherein the member comprises an OLED, Sensor, AMOLED, or quantum dot.
52. An adhesive transfer tape comprising:
an adhesive layer comprising a first face and a second face opposite the first face; and at least one release liner disposed on at least one of the first face and the second face of the adhesive layer;
the adhesive transfer tape having:
a total light transmittance of at least about 85% within the visible spectrum;
a haze value of about 3% or less;
a water vapor transmission rate (WVTR) of about 500 g/m2/day or less at about 45 °C/100% RH; and
a thickness of the adhesive layer about 25 microns or less.
53. The adhesive transfer tape of Claim 52, wherein the thickness of the adhesive layer is about 15 microns or less.
54. The adhesive transfer tape of any one of Claims 52-53, wherein the thickness of the adhesive layer is about 10 microns or less.
55. The adhesive transfer tape of any one of Claims 52-54, wherein the thickness of the adhesive layer is about 5 microns or less.
56. The adhesive transfer tape of any one of Claims 52-55, the adhesive layer having a water vapor transmission rate (WVTR) of about 200 g/m2/day or less at about 45 °C/100 RH.
57. The adhesive transfer tape of any one of Claims 52-56, the adhesive layer having a water vapor transmission rate (WVTR) of about 100 g/m2/day or less at about 45 °C/100 RH.
58. The adhesive transfer tape of any one of Claims 52-57, the adhesive layer having a total light transmittance of at least about 90%.
59. The adhesive transfer tape of any one of Claims 52-58, the adhesive layer having a haze value of about 1 % or less.
60. The adhesive transfer tape of any one of Claims 52-59, the adhesive layer having a haze value of about 0.5% or less.
61. The adhesive transfer tape of any one of Claims 52-60, wherein the adhesive layer exhibits corrosion resistance or low corrosion to metallic surfaces after aging the member assembly for 500 hours at about 65 °C temperature and about 90% relative humidity.
62. The adhesive transfer tape of any one of Claims 52-61 , wherein the adhesive layer is (i) highly flexible, (ii) bendable, and (iii) conformable.
63. The adhesive transfer tape of any one of Claims 52-62, the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 175 nm or less.
64. The adhesive transfer tape of any one of Claims 52-63, the release liner is a fluorosilicone release liner having an average surface roughness (SA) of about 125 nm or less.
65. The adhesive transfer tape of any one of Claims 52-64, the release liner is a fluorosilicone release liner having a root mean squared roughness (Sq) of about 200 nm or less.
66. The adhesive transfer tape of any one of Claims 52-62, the release liner is a silicone release liner having an average surface roughness (SA) of about 70 nm or less.
67. The adhesive transfer tape of any one of Claims 52-62 and 66, the release liner is a silicone release liner having an average surface roughness (SA) of about 50 nm or less.
68. The adhesive transfer tape of any one of Claims 52-62 and 66-67, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 125 nm or less.
69. The adhesive transfer tape of any one of Claims 52-62 and 66-68, the release liner is a silicone release liner having a root mean squared roughness (SQ) of about 100 nm or less.
70. The adhesive transfer tape of any one of Claims 52-62, wherein the adhesive layer is substantially free of acidic components and/or ionic components.
71. The adhesive transfer tape of any one of Claims 52-62 and 70, wherein the adhesive layer comprises at least one adhesive of acrylic based adhesives, rubber based adhesives, polyurethane based adhesives, polyester based adhesives, silicone based adhesives, and hybrid adhesives.
72. The adhesive transfer tape of any one of Claims 52-62 and 70-71 , wherein the adhesive layer comprises a pressure sensitive adhesive.
73. The adhesive transfer tape of any one of Claims 52-62 and 70-72, wherein the adhesive layer comprises a substantially acid-free acrylic based adhesive.
74. The adhesive transfer tape of any one of Claims 52-62 and 70-72, wherein the adhesive layer comprises a silicone based adhesive.
75. The adhesive transfer tape of any one of Claims 52-62, 70-72, and 74, wherein the adhesive layer is an addition curable silicone based adhesive.
76. The adhesive transfer tape of any one of Claims 52-62, 70-75, wherein the adhesive layer further comprises at least one corrosion resistance additive.
77. The adhesive transfer tape of Claim 76, wherein the corrosion resistance additive comprises benzophenone.
78. The adhesive transfer tape of Claim 76, wherein the corrosion resistance additive comprises triazine.
79. The adhesive transfer tape of Claim 76, wherein the corrosion resistance additive comprises benzotriazole.
80. The adhesive transfer tape of Claim 76, wherein the corrosion resistance additive comprises hindered amine light stabilizers.
81. A method of producing an adhesive transfer tape comprising at least partially coating at least a portion of a first release liner with a first face of an adhesive layer, wherein the adhesive transfer tape of Claim 52 is produced.
82. The method of Claim 81 further comprising:
disposing at least a portion of a second face of the adhesive layer with a second release liner.
83. The method of any one of Claims 81-82 further comprising:
winding the adhesive transfer tape into a roll.
84. The method of any one of Claims 81-83, wherein the method is performed using at least one coater of a gravure roll coater, a micro-gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, a spray coater, and a die coater.
85. A member assembly comprising:
a member comprising a surface;
an adhesive transfer tape disposed on the surface of the member, the adhesive transfer tape comprising:
an adhesive layer comprising a first face and a second face opposite the first face; and
at least one release liner disposed on at least one of the first face and the second face of the adhesive layer;
the adhesive transfer tape having:
a total light transmittance of at least about 85% within the visible spectrum; a haze value of about 3% or less;
a water vapor transmission rate (WVTR) of about 500 g/m2/day or less at about 45 °C/100% RH; and
a thickness of the adhesive transfer tape about 25 microns or less.
86. The member assembly of Claim 85, wherein the member is at least one member of an electronic member and an optical member.
87. The member assembly of any one of Claims 85-86 further comprising at least one additional member assembly disposed on the member assembly.
88. The member assembly of any one of Claims 85-87, wherein the member comprises an OLED, Sensor, AMOLED, or quantum dot.
89. An adhesive layer comprising:
at least one adhesive having:
a total light transmittance of at least about 85% within the visible spectrum; a haze value of about 3% or less;
a water vapor transmission rate (WVTR) of about 500 g/m2/day or less at about 45 °C/100 RH; and
a thickness of the adhesive of about 100 microns or less.
90. The adhesive layer of Claim 89, wherein the adhesive comprises at least one adhesive of acrylic based adhesives, rubber based adhesives, polyester based adhesives, polyurethane based adhesives, silicone based adhesives, and hybrid adhesives.
91. The adhesive layer of any one of Claims 89-90, wherein the adhesive comprises a pressure sensitive adhesive.
92. The adhesive layer of any one of Claims 89-91, wherein the adhesive is addition curable silicone based adhesive.
93. The adhesive layer of any one of Claims 89-91, wherein the adhesive is polyisobutylene (PIB) wherein the polyisobutylene is at least part of a butyl-based adhesive.
94. The adhesive layer of Claim 93, wherein polyisobutylene (PIB) is functionalized.
95. The adhesive layer of any one of Claims 89-94, wherein the adhesive is substantially free of acidic components.
96. The adhesive layer of any one of Claims 89-95, wherein the adhesive is substantially free of ionic components.
97. The adhesive layer of any one of Claims 89-96, wherein the adhesive has a total light transmittance of at least about 90%.
98. The adhesive layer of any one of Claims 89-97, wherein the adhesive has a light transmittance of about 10% or less at about 380 nm.
99. The adhesive layer of any one of Claims 89-98, wherein the adhesive has a light transmittance of about 5% or less at about 380 nm.
100. The adhesive layer of any one of Claims 89-99, wherein the adhesive has a light transmittance of about 1% or less at about 380 nm.
101. The adhesive layer of any one of Claims 89-100, wherein the adhesive has a haze value is about 1 % or less.
102. The adhesive layer of any one of Claims 89-101, wherein the adhesive has a haze value is about 0.5% or less.
103. The adhesive layer of any one of Claims 89-102, wherein the adhesive exhibits corrosion resistance or low corrosion to metallic surfaces after aging the member assembly for 500 hours at about 65 °C temperature and about 90% relative humidity.
104. The adhesive layer of any one of Claims 89-103, wherein the adhesive exhibits corrosion resistance or low corrosion to metals, metal oxides, and metal alloys.
105. The adhesive layer of any one of Claims 89-104, wherein the adhesive exhibits corrosion resistance or low corrosion to at least one metal of copper, tin, aluminum, and indium tin oxide.
106. The adhesive layer of any one of Claims 89-105, wherein the adhesive exhibits corrosion resistance or low corrosion to lighting sources.
107. The adhesive layer of any one of Claims 89-106, wherein the adhesive exhibits corrosion resistance or low corrosion to at least one of OLED encapsulation, AMOLED encapsulation, and quantum dots.
108. The adhesive layer of any one of Claims 89-107, wherein the adhesive has a dielectric constant of about 2 to about 6.
109. The adhesive layer of any one of Claims 89-108, wherein the adhesive has a dielectric constant of about 2.5 to about 3.5.
110. The adhesive layer of any one of Claims 89-109, wherein the adhesive has a refractive index of about 1.25 to about 1.80 at about 25 °C.
111. The adhesive layer of any one of Claims 89-110, wherein the adhesive has a refractive index of about 1.35 to about 1.60 at about 25 °C.
112. The adhesive layer of any one of Claims 89-111, wherein the adhesive further comprises at least one corrosion resistance additive.
113. The adhesive layer of Claim 112, wherein the corrosion resistance additive comprises benzophenone.
114. The adhesive layer of Claim 112, wherein the corrosion resistance additive comprises triazine.
115. The adhesive layer of Claim 112, wherein the corrosion resistance additive comprises benzotriazole.
116. The adhesive layer of Claim 112, wherein the corrosion resistance additive comprises hindered amine light stabilizers.
117. The adhesive layer of Claim 112, wherein the adhesive comprises about 0.1% to about 10% corrosion resistance additive by weight.
118. The adhesive layer of any one of Claims 89-112, wherein the adhesive has a thickness of about 30 microns or less.
119. The adhesive layer of any one of Claims 89-112, wherein the adhesive has a thickness of about 15 microns or less.
120. The adhesive layer of any one of Claims 89-112, wherein the adhesive has a thickness of about 5 microns or less.
PCT/US2017/059526 2016-11-01 2017-11-01 Optically clear barrier tapes WO2018085395A1 (en)

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