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WO2016068661A2 - Dispositif d'affichage flexible - Google Patents

Dispositif d'affichage flexible Download PDF

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Publication number
WO2016068661A2
WO2016068661A2 PCT/KR2015/011603 KR2015011603W WO2016068661A2 WO 2016068661 A2 WO2016068661 A2 WO 2016068661A2 KR 2015011603 W KR2015011603 W KR 2015011603W WO 2016068661 A2 WO2016068661 A2 WO 2016068661A2
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WO
WIPO (PCT)
Prior art keywords
adhesive film
meth
display device
flexible display
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2015/011603
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English (en)
Korean (ko)
Other versions
WO2016068661A3 (fr
Inventor
문형랑
김지호
김일진
곽병도
김지희
문성현
신선희
이광환
이우진
이은화
조익환
한재현
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Samsung SDI Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Samsung SDI Co Ltd
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 claimed from KR1020150150670A external-priority patent/KR101659239B1/ko
Application filed by Samsung Electronics Co Ltd, Samsung SDI Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to EP15854252.2A priority Critical patent/EP3214531B1/fr
Priority to US15/522,253 priority patent/US10669450B2/en
Priority to CN201580058757.9A priority patent/CN107077247B/zh
Publication of WO2016068661A2 publication Critical patent/WO2016068661A2/fr
Publication of WO2016068661A3 publication Critical patent/WO2016068661A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • the present invention relates to a flexible display device.
  • the flexible display device having a flexibility to be folded and unfolded while replacing a glass substrate or a high hardness substrate with a film in a liquid crystal display device, an organic light emitting diode display device, and the like has been developed.
  • the flexible display device is advantageous in that it can be manufactured in various forms because the film is used as a substrate, it is not only thin and light but also strong against impact and can be folded and unfolded.
  • a flexible display device has a structure in which a window film is laminated on a display member, and an optical clear adhesive (OCA) film is interposed between the display member and the window film.
  • OCA optical clear adhesive
  • An object of the present invention is to provide a flexible display device having excellent quality by applying a pressure-sensitive adhesive film is maintained, and also excellent recovery characteristics.
  • Another object of the present invention is to provide a flexible display device capable of maintaining excellent reliability and durability even in severe use environments, storage environments, and / or manufacturing environments.
  • An aspect of the present invention relates to a flexible display device.
  • the flexible display device includes an optical device portion, a first adhesive film formed on the optical device portion, a touch function portion formed on the first adhesive film, a second adhesive film formed on the touch function portion, and the second adhesive film.
  • the storage modulus of the storage modulus according to the temperature of the y-axis (KPa) is based on the x-axis
  • the first adhesive film or the second adhesive film may have a storage modulus of about 10 KPa or more at 80 ° C.
  • the flexible display device includes an optical device portion, a first adhesive film formed on the optical device portion, a touch function portion formed on the first adhesive film, a second adhesive film formed on the touch function portion, and the second A window film formed on the pressure-sensitive adhesive film, wherein the first pressure-sensitive adhesive film or the second pressure-sensitive adhesive film is formed of a pressure-sensitive adhesive composition comprising a monomer mixture and organic particles to form a (meth) acrylic copolymer having a hydroxyl group, the organic The average particle diameter of the particles may be 10 nm to 400 nm.
  • the flexible display device may further include a polarizer formed on the touch function unit or the first adhesive film.
  • the touch function unit may include a base layer, and the base layer may include a polarizer.
  • the optical device unit may be an LCD including an OLED, an LED, or a light source.
  • the thickness of the first adhesive film may be thicker than the second adhesive film.
  • the first adhesive film or the second adhesive film may have a T-peel peel strength of about 400 gf / in to about 5,000 gf / in at 25 ° C. with respect to the corona treated polyethylene terephthalate (PET) film. .
  • PET polyethylene terephthalate
  • the first adhesive film or the second adhesive film may have a T-peel peel strength of about 200 gf / in to about 3,000 gf / in at 60 ° C. with respect to the corona treated polyethylene terephthalate (PET) film. .
  • PET polyethylene terephthalate
  • the first adhesive film or the second adhesive film may have a storage modulus of about 10 KPa to about 1000 KPa at 80 ° C.
  • the first adhesive film or the second adhesive film may have a storage modulus of about 10 KPa to about 1000 KPa at -20 ° C.
  • the first adhesive film or the second adhesive film may have a haze of about 5% or less after 200% stretching at a thickness of about 100 ⁇ m.
  • the first pressure-sensitive adhesive film or the second pressure-sensitive adhesive film may have a recovery force of about 30% to about 98% by a thickness of about 100 ⁇ m.
  • Equation 1 when both ends of the PET (polyethylene terephthalate) film (thickness: about 75 ⁇ m) of the horizontal ⁇ vertical (about 50 mm ⁇ about 20 mm), respectively called the first end and the second end, The end portions of each of the two PET films are adhered to each other by an X-length (about 20 mm ⁇ about 20 mm) adhesive film, and the first end / adhesive film of the PET film (width ⁇ length, about 20 mm ⁇ about 20 mm) A test piece was prepared in the order of the second end of the PET film, the jig was fixed to both ends of the PET film, one jig was fixed, and the other jig was pulled at a speed of about 300 mm / min.
  • the first adhesive film or the second adhesive film may have an elongation of about 800% to about 2000%.
  • PET and the adhesive having a thickness of about 50 ⁇ m on one surface of the first adhesive film (about 13 cm ⁇ about 3 cm, thickness about 100 ⁇ m) or the second adhesive film (about 13 cm ⁇ about 3 cm, thickness about 100 ⁇ m)
  • a pressure-sensitive adhesive film having about 100 ⁇ m-thick PET laminated on the back side of the film is bent in a 50 ⁇ m PET direction so that the horizontal length of the pressure-sensitive adhesive film is about 1/2 between parallel frames of about 1 cm intervals, and the temperature is about 70 ° C.
  • the bubble generation area may be about 0%.
  • the bubble generation area of the first adhesive film or the second adhesive film may be about 0%.
  • the first pressure-sensitive adhesive film or the second pressure-sensitive adhesive film is a cured product of the pressure-sensitive adhesive composition
  • the pressure-sensitive adhesive composition may include a monomer mixture and organic particles to form a (meth) acrylic copolymer having a hydroxyl group.
  • the organic particles may have an average particle diameter of about 10 nm to about 400 nm.
  • the monomer mixture forming the (meth) acrylic copolymer having a hydroxyl group may include a (meth) acrylate and a comonomer having a hydroxyl group.
  • the organic particles have a core-shell structure, and the glass transition temperature of the core and the shell may satisfy the following Equation 2.
  • Tg (c) is the glass transition temperature (° C.) of the core
  • Tg (s) is the glass transition temperature (° C.) of the shell
  • the glass transition temperature of the core is about -150 °C to about 10 °C, the glass transition temperature of the shell may be about 15 °C to about 150 °C.
  • the core comprises at least one polyalkyl (meth) acrylate having a glass transition temperature of about -150 ° C to about 10 ° C
  • the shell has a polyalkyl (meth) having a glass transition temperature of about 15 ° C to about 150 ° C. It may contain one or more acrylates.
  • the core or the shell may include two or more layers, and the outermost layer of the organic particles may include one or more polyalkyl (meth) acrylates having a glass transition temperature of about 15 ° C to about 150 ° C. have.
  • the shell may be included in about 1% to about 70% by weight of the organic particles.
  • the organic particles may be included in an amount of about 0.1 parts by weight to about 15 parts by weight based on 100 parts by weight of the monomer mixture forming a (meth) acrylic copolymer having a hydroxyl group.
  • the organic particles may have a refractive index difference of about 0.05 or less from a (meth) acrylic copolymer having a hydroxyl group formed from the monomer mixture.
  • the (meth) acrylic copolymer having a hydroxyl group may be polymerized from a monomer mixture comprising about 5% to about 40% by weight of (meth) acrylate having a hydroxyl group and about 60% to about 95% by weight comonomer. have.
  • the comonomer is an alkyl (meth) acrylate monomer, a monomer having an ethylene oxide, a monomer having a propylene oxide, a monomer having an amine group, a monomer having an amide group, a monomer having an alkoxy group, a monomer having a phosphoric acid group, a monomer having a sulfonic acid group, At least one of a monomer having a phenyl group and a monomer having a silane group, wherein the glass transition temperature (Tg) of the comonomer may be about -150 °C to about 0 °C.
  • Tg glass transition temperature
  • the pressure-sensitive adhesive composition may further include one or more of an initiator and a crosslinking agent.
  • the present invention provides a flexible display device having excellent quality by maintaining a viscoelastic property and applying an adhesive film having excellent recovery properties and maintaining excellent reliability and durability even in severe use environments, storage environments, and / or manufacturing environments. Has the effect.
  • FIG. 1 is a cross-sectional view of a flexible display device of an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of a flexible display device of another embodiment of the present invention.
  • FIG 3 is a cross-sectional view of a flexible display device according to still another embodiment of the present invention.
  • FIG. 4 is a conceptual diagram of a specimen for measuring T-peel peel strength.
  • FIG. 5 is a cross-sectional view and a plan view of a specimen for measuring the recovery force.
  • (meth) acryl refers to acrylic and / or methacryl.
  • copolymer may include oligomers, polymers or resins.
  • nonomer is a monomer that polymerizes with (meth) acrylate having a hydroxyl group, and is not limited as long as it is capable of polymerization with (meth) acrylate having a hydroxyl group.
  • the "glass transition temperature" of the monomer may refer to the glass transition temperature measured by DSC measurement of TA Instrument for the homopolymer of the monomer to be measured. Specifically, the temperature of the monomer to be measured is raised to about 180 ° C. at a rate of about 20 ° C./min, and then cooled slowly to about ⁇ 80 ° C., and then about 180 ° C. at a rate of about 10 ° C./min. After the data of the endothermic transition curve when the temperature is raised to, the inflection point of the endothermic transition curve can be determined as the glass transition temperature.
  • the "bubble generation area of the adhesive film” is about 50 ⁇ m thick PET on one side of the adhesive film (about 13 cm ⁇ about 3 cm, thickness about 100 ⁇ m) and about 100 ⁇ m thick PET on the back side of the adhesive film.
  • the laminated pressure-sensitive adhesive film is bent in a direction of 50 ⁇ m PET so that the horizontal length of the pressure-sensitive adhesive film is about 1/2 between parallel frames of about 1 cm interval, and aged at a temperature of about 70 ° C. and a humidity of about 93% for about 24 hours. It is the value (%) which measured the ratio of the bubble size and the occupied area to the area by aging and analyzing the image measured with the optical microscope (Olympus, EX-51) with Mountech Mac-view software.
  • bubble generation area of a display device refers to replacing the window film of the flexible display device with a PET film (thickness of about 100 ⁇ m), and then bending it in the direction of the PET film between parallel frames at a distance of about 1 cm.
  • average particle diameter is a particle diameter of organic particles expressed in Z-average values measured in an aqueous solvent or an organic solvent using a Zetasizer nano-ZS device manufactured by Malvern.
  • core-shell structure may mean a conventional core-shell structure, and also includes a structure in which the core or the shell is several layers, and the “outer layer” refers to the outermost layer of the various layers. it means.
  • the "elongation rate” refers to TA (TA.XT_Plus Texture Analyzer (Stable Micro System)) by preparing a pressure-sensitive adhesive film sample having a thickness of about 100 ⁇ m, about 5 cm ⁇ about 5 cm, and then rolling it tightly. When both ends are fixed and stretched at a speed of about 300 mm / min, it means the ratio (%) of the length at the moment of breaking with respect to the length before stretching.
  • T-peel peel strength means a value measured by the measuring method of the following i) to v).
  • the pressure-sensitive adhesive composition is applied to a release treated PET (polyethylene terephthalate) film, and irradiated with an ultraviolet light amount of about 2000 mJ / cm 2 to prepare a pressure-sensitive adhesive film and a pressure-sensitive adhesive sheet of about 100 ⁇ m thickness.
  • T-peel peel strength is measured by fixing one PET film on the TA.XT_Plus Texture Analyzer and pulling the other PET film at a speed of about 50 mm / min. (See FIG. 4B)
  • the "recovery force" is when both ends of the PET (polyethylene terephthalate) film (thickness: about 75 ⁇ m) of width X length (about 50 mm ⁇ about 20 mm) are referred to as the first and second ends, respectively.
  • the end portions of each of the two PET films are adhered to each other by an adhesive film having a width ⁇ length (about 20 mm ⁇ about 20 mm), and the first ends of the PET film / adhesive film / PET film are adhered in the order of the second ends of the PET films.
  • the area of contact between the PET film and the pressure-sensitive adhesive film is measured with a specimen that is horizontal x vertical (about 20 mm x about 20 mm).
  • the jig (jig) is fixed to both ends of the non-adhesive PET film of the specimen at room temperature (about 25 °C)
  • One jig is fixed and the other jig is about 1000% of the thickness of the pressure-sensitive adhesive film at a speed of about 300 mm / min (about 10 times the initial thickness of the adhesive film, X 0 ).
  • the adhesive film After pulling as much as it is maintained for about 10 seconds, the adhesive film is restored to the same speed (about 300 mm / min) at the speed of pulling the adhesive film stretched length when the force of about 0 kPa applied to the adhesive film X f ( Unit: ⁇ m), the recovery force (%) is a value calculated by the following equation (1):
  • the initial thickness of the adhesive film may be about 20 ⁇ m to about 300 ⁇ m.
  • the recovery power can be measured with a TA.XT_Plus Texture Analyzer (Stable Micro System).
  • the recovery force can be measured at about 25 ° C to about 80 ° C.
  • FIG. 1 is a flexible display device according to an embodiment of the present invention.
  • the flexible display device 100 includes an optical element portion 91, a first adhesive film 92 (a) formed on the optical element portion 91, and a first adhesive film 92 (a).
  • the touch function unit 93 formed on the upper surface of the touch function unit 93, the second adhesive film 92 (b) formed on the touch function unit 93, and the window film 95 formed on the second adhesive film 92 (b).
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a distribution of storage modulus according to temperature, the temperature is the x-axis (° C), and the storage modulus is the y-axis (KPa).
  • the average slope at -20 ° C to 80 ° C may be about -9.9 to about 0.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has an average slope of about -9.9, -9.5, -9, -8.5, -8, -7.5,- 7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5, -2, -1.5, -1, -0.5 or 0.
  • first pressure-sensitive adhesive film 92 (a) or the second pressure-sensitive adhesive film 92 (b) may have an average slope in a range of at least one of the above values and at most one of the above values.
  • the average slope may specifically be about ⁇ 5 to about 0, more specifically about ⁇ 2 to about 0.
  • the adhesive film exhibits viscoelastic properties in a wide temperature range, excellent recovery power, and can be used in a flexible display device.
  • the average slope means an average slope at ⁇ 20 ° C. to 80 ° C. when the storage modulus distribution according to the temperature of the adhesive film is represented by the temperature x axis (° C.) and the storage modulus on the y axis (KPa). Calculated according to 3.
  • Mo (80 ° C) is the storage modulus at 80 ° C
  • Mo (-20 ° C) is the storage modulus at -20 ° C)
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) may have a storage modulus of about 10 KPa or more at 80 ° C.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a storage modulus of about 10, 20, 30, 40, 50, 60, 70, 80, It may be 90, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950 or 1000 KPa.
  • first pressure-sensitive adhesive film (92 (a)) or the second pressure-sensitive adhesive film (92 (b)) at 80 °C storage modulus may be in the range of one or more of the above values and about one or less of the above values.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a storage modulus of about 10 KPa to about 1000 KPa, specifically about 10 KPa to about 800 KPa at 80 ° C. And more specifically, from about 10 KPa to about 100 KPa. In the above range, the viscoelastic characteristics are expressed even at high temperatures, and the recovery force of the adhesive film is excellent.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) is previously surface treated, for example, about 150 mJ / cm 2 on the adherend surface to which the adhesive film is attached.
  • the corona pretreatment step may be followed.
  • the corona pretreatment may be performed by using a corona treatment (Now plasma) to treat the surface to be bonded (eg, PET film) twice while discharging at a dose of about 78 doses. It is not.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) is a T-peel for the corona-treated PET film at room temperature (about 25 °C) at a thickness of about 100 ⁇ m Peel strength can be about 400 gf / in to about 5,000 gf / in.
  • the first pressure-sensitive adhesive film 92 (a) or the second pressure-sensitive adhesive film 92 (b) may be used as a tip for corona-treated PET film at room temperature (about 25 ° C.) at a thickness of about 100 ⁇ m.
  • T-peel peeling strength of about 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400, 4500, 4600, 4700, 4800, 4900 or May be 5000 gf / in.
  • the first adhesive film (92 (a)) or the second adhesive film (92 (b)) is a T-fill for the corona treated PET film at room temperature (about 25 °C) at a thickness of about 100 ⁇ m (T-
  • the peel strength may be in the range of at least one of the above values and at most one of the above values.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) is a T-peel for the corona-treated PET film at room temperature (about 25 °C) at a thickness of about 100 ⁇ m Peel strength can be about 500 gf / in to about 4,000 gf / in, more specifically about 700 gf / in to about 3,500 gf / in. In the above range, the adhesion and reliability of the pressure-sensitive adhesive film is excellent at room temperature.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a T-peel peel strength of the corona-treated PET film at about 60 °C at a thickness of about 100 ⁇ m About 200 gf / in to about 3,000 gf / in.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) is a T-peel for the corona-treated PET film at about 60 °C at a thickness of about 100 ⁇ m ) Peel strength about 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400 , 2500, 2600, 2700, 2800, 2900 or 3000 gf / in.
  • the first adhesive film (92 (a)) or the second adhesive film (92 (b)) is a T-peel peeling on the corona treated PET film at about 60 °C at a thickness of about 100 ⁇ m
  • the intensity can range from about one or more of the above values and about one or less of the above values.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) is peeled off the T-peel for the corona-treated PET film at about 60 °C at a thickness of about 100 ⁇ m
  • the strength may be about 500 gf / in to about 2,000 gf / in, more specifically about 500 gf / in to about 1,500 gf / in. In the above range, even when the adhesive film at high temperature has a curvature shape, the adhesive force and reliability are excellent.
  • T-peel peel strength of the adhesive film is measured as follows. Corona of PET film with corona treatment of horizontal ⁇ length ⁇ thickness (about 150 mm ⁇ about 25 mm ⁇ about 75 ⁇ m) on both sides of the adhesive film of about 100 mm ⁇ 25 mm ⁇ 100 ⁇ m (width ⁇ length ⁇ thickness) Each pretreated side is laminated and autoclaved for about 1000 seconds at a pressure of about 3.5 bar and about 50 ° C. and fixed in a TA.XT_Plus Texture Analyzer (Stable Micro System). At 25 ° C. or 60 ° C., one PET film is fixed and the other PET film is pulled at a rate of about 50 mm / min to measure the T-peel peel strength for the PET film. Corona pretreatment of the PET film, for example, using a corona treatment (Now plasma), while discharging at a dose of about 78 doses, the PET film can be treated twice (total dose: about 156 doses).
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a storage modulus of about 10 KPa or more, for example, about 10 KPa to about 1000 KPa, specifically about 10 KPa at 80 ° C. To about 800 KPa, more specifically about 10 KPa to about 100 KPa. In the above range, the viscoelastic characteristics are expressed even at high temperatures, and the recovery force of the adhesive film is excellent.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a storage modulus of about 10 KPa to about 1000 KPa, specifically about 10 KPa to about 800 KPa at 25 ° C. May include a pressure-sensitive adhesive film of about 20 KPa to about 500 KPa. In the above range, the viscoelastic properties are expressed at room temperature, and there is an excellent recovery force.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a storage modulus of about 10 KPa to about 1000 KPa, specifically about 10 KPa to about 500 KPa at -20 ° C. It may include a pressure-sensitive adhesive film of about 20 KPa to about 500 KPa. In the above range, when used in the flexible device at a low temperature, the adhesive film is flexible, there is no whitening phenomenon, there is an advantage that can be used for optical materials.
  • the ratio of the storage modulus at 80 ° C. to the storage modulus at ⁇ 20 ° C. of the first adhesive film 92 (a) or the second adhesive film 92 (b) is about 1: 1 to about 1:10, specifically, About 1: 1 to 1: 8, more specifically about 1: 1 to 1: 5.
  • the adhesive film does not fall off the adhesion between the adhesives in a wide temperature range (-20 to 80 °C), it can be used in a flexible (flexible) display device.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a haze of about 5% or less, specifically about 3% or less, more specifically about 1 at a thickness of about 100 ⁇ m. It may include a pressure-sensitive adhesive film or less. In the above range, excellent transparency is exhibited when the adhesive film is used in an optical display device.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a haze of about 5% or less, specifically about 3% or less, after stretching of about 200% at a thickness of about 100 ⁇ m.
  • the adhesive film may include about 1% or less. In the above range, the adhesive film exhibits excellent transparency when used in a display.
  • the first pressure-sensitive adhesive film 92 (a) or the second pressure-sensitive adhesive film 92 (b) may have a recovery force of about 30% to about 98% by a thickness of about 100 ⁇ m.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) has a thickness of about 100 ⁇ m, and a recovery force of about 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97 or 9
  • the first pressure-sensitive adhesive film (92 (a)) or the second pressure-sensitive adhesive film (92 (b)) has a thickness of about 100 ⁇ m
  • the recovery force according to the following formula 1 is at least one of the above values and about the above numerical value It may be in the range of one or less.
  • the adhesive film can be applied to a flexible display device, and the service life is also long.
  • Equation 1 when both ends of the PET (polyethylene terephthalate) film (thickness: about 75 ⁇ m) of the horizontal ⁇ vertical (about 50 mm ⁇ about 20 mm), respectively called the first end and the second end, The end portions of each of the two PET films are adhered to each other by an X-length (about 20 mm ⁇ about 20 mm) adhesive film, and the first end / adhesive film of the PET film (width ⁇ length, about 20 mm ⁇ about 20 mm) A test piece was prepared in the order of the second end of the PET film, the jig was fixed to both ends of the PET film, one jig was fixed, and the other jig was pulled at a speed of about 300 mm / min.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) is cut to a size of about 100 ⁇ m in thickness and about 5 cm ⁇ about 5 cm, and then rolled to adhere tightly to the TA (TA.XT_Plus).
  • TA TA.XT_Plus
  • both ends are fixed to a Texture Analyzer (manufactured by Stable Micro System) and stretched at a speed of about 300 mm / min
  • the length of the break point of the adhesive film is about 800% to about 2000 compared to the length before stretching.
  • % Specifically about 800% to about 1800%, more specifically about 900% to about 1700% in the above range is applicable to the flexible display device and excellent in reliability.
  • the first pressure-sensitive adhesive film 92 (a) or the second pressure-sensitive adhesive film 92 (b) is about 50 cm thick PET and the adhesive on one surface of about 13 cm x about 3 cm, 100 mm thick adhesive film
  • the adhesive film in which PET of about 100 ⁇ m thickness is laminated on the back side of the film, is bent in a direction of about 50 ⁇ m PET so that the horizontal length of the adhesive film is about 1/2 between parallel frames of about 1 cm interval, and the temperature is about 70
  • the bubble generation area may be about 0%.
  • the adhesive film is excellent in reliability and can be applied to a flexible display device.
  • the flexible display apparatus 100 replaces the window film with a PET film (about 100 ⁇ m in thickness), bends the PET film in the direction of the PET film between parallel frames of about 1 cm intervals, and has a temperature of about 70 ° C. and a humidity of about 93%.
  • the bubble generation area of the first adhesive film or the second adhesive film may be about 0%. In the above range, the bubble area is reduced by the spreading, diffusion, movement, etc., the bubble area can be reduced, and the reliability of the adhesive film and the display device is increased.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) may have a thickness of about 1 ⁇ m to about 2 mm, specifically about 50 ⁇ m to about 1 mm and in the above range, It can be used for a display device.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) may be formed by curing the adhesive composition.
  • the first adhesive film 92 (a) or the second adhesive film 92 (b) may include a cured product of the adhesive composition.
  • the pressure-sensitive adhesive composition may include a monomer mixture and organic particles forming a (meth) acrylic copolymer having a hydroxyl group.
  • the monomer mixture forming the (meth) acrylic copolymer having a hydroxyl group may include a (meth) acrylate having a hydroxyl group and a comonomer, and the (meth) acrylic copolymer having the hydroxyl group polymerizes the monomer mixture. Can be formed.
  • the (meth) acrylate having a hydroxyl group is a (meth) acrylic acid ester having an alkyl group having 1 to 20 carbon atoms having at least one hydroxyl group, a (meth) acrylic acid ester having a cycloalkyl group having 5 to 20 carbon atoms having at least one hydroxyl group, Or a (meth) acrylic acid ester having an aryl group having 6 to 20 carbon atoms having at least one hydroxyl group.
  • the (meth) acrylate having a hydroxyl group is, for example, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy It may be one or more of propyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, but is not necessarily limited thereto.
  • an alkyl group-containing (meth) acrylic monomer having 1 to 5 carbon atoms having a hydroxyl group there may be an effect of increasing adhesion.
  • the (meth) acrylate having a hydroxyl group may be included in about 5% to about 40% by weight, for example from about 10% to about 30% by weight of the monomer mixture forming the (meth) acrylic copolymer having a hydroxyl group. .
  • the adhesive film in the above range has an excellent effect of adhesion and reliability.
  • Comonomers are alkyl (meth) acrylate monomers, monomers with ethylene oxide, monomers with propylene oxide, monomers with amine groups, monomers with amide groups, monomers with alkoxy groups, monomers with phosphoric acid groups, monomers with sulfonic acid groups, phenyl groups It may include one or more of a monomer having a monomer and a silane group, but is not necessarily limited thereto.
  • the alkyl (meth) acrylate monomer may include an unsubstituted linear or branched alkyl (meth) acrylic acid ester having 1 to 20 carbon atoms.
  • one or more (meth) acrylate monomers containing an ethylene oxide group may be used.
  • the monomer having propylene oxide may be polypropylene oxide monomethyl ether (meth) acrylate, polypropylene oxide monoethyl ether (meth) acrylate, polypropylene oxide monopropyl ether (meth) acrylate, polypropylene oxide monobutyl ether ( Meth) acrylate, polypropylene oxide monopentyl ether (meth) acrylate, polypropylene oxide dimethyl ether (meth) acrylate, polypropylene oxide diethyl ether (meth) acrylate, polypropylene oxide monoisopropyl ether (meth) Polypropylene oxide alkyl ether (meth) acrylates such as acrylates, polypropylene oxide monoisobutyl ether (meth) acrylates, polypropylene oxide monotertbutyl ether (meth) acrylates, but are not necessarily limited thereto. Is no.
  • Monomer which has the said amino group is monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, monomethylaminopropyl (meth) acrylate, monoethylaminopropyl (meth) acrylate, and dimethylaminoethyl Amino-group-containing (meth) acrylic-types, such as (meth) acrylate, diethylaminoethyl (meth) acrylate, N-tert- butylaminoethyl (meth) acrylate, and methacryloxyethyl trimethylammonium chloride (meth) acrylate It may be a monomer, but is not necessarily limited thereto.
  • the monomer having an amide group may be (meth) acrylamide, N-methylacrylamide, N-methylmethacrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N, N- Amide group-containing (meth) acrylic monomers such as methylene bis (meth) acrylamide and 2-hydroxyethylacrylamide may be used, but are not necessarily limited thereto.
  • Monomers having the alkoxy group include 2-methoxy ethyl (meth) acrylate, 2-methoxypropyl (meth) acrylate, 2-ethoxypropyl (meth) acrylate, 2-butoxypropyl (meth) acrylate, 2-methoxypentyl (meth) acrylate, 2-ethoxypentyl (meth) acrylate, 2-butoxyhexyl (meth) acrylate, 3-methoxypentyl (meth) acrylate, 3-ethoxypentyl ( Meth) acrylate, 3-butoxyhexyl (meth) acrylate, but is not necessarily limited thereto.
  • It may be an acrylic monomer having a phosphoric acid group, such as, but is not necessarily limited thereto.
  • the monomer having a sulfonic acid group is an acrylic monomer having a sulfonic acid group such as sodium sulfopropyl (meth) acrylate, sodium 2-sulfoethyl (meth) acrylate, and sodium 2-acrylamido-2-methylpropane sulfonate.
  • the present invention is not limited thereto.
  • the monomer having a phenyl group may be an acryl-based vinyl monomer having a phenyl group such as p-tert-butylphenyl (meth) acrylate and o-biphenyl (meth) acrylate, but is not necessarily limited thereto.
  • Monomers having the silane group include 2-acetoacetoxyethyl (meth) acrylate, vinyltrimethoxysilane, vinyltriethoxysilane, vinyl tris ( ⁇ -methoxyethyl) silane, vinyltriacetylsilane and methacryloyl. It may be a vinyl monomer having a silane group such as oxypropyltrimethoxysilane, but is not necessarily limited thereto.
  • the comonomer may be included in about 60% to about 95% by weight, for example from about 70% to about 90% by weight of the monomer mixture forming the (meth) acrylic copolymer having a hydroxyl group.
  • the adhesive film in the above range has an excellent adhesive strength and excellent reliability effect.
  • the comonomer may use a glass transition temperature (Tg) of about -150 °C to about 0 °C.
  • Tg glass transition temperature
  • the glass transition temperature can be measured using, for example, DSC discovery of TA Instrument for the homopolymer of each measurement target monomer. Specifically, the temperature is raised to about 180 ° C at a rate of about 20 ° C / min with respect to the homopolymer of each monomer, and then cooled slowly to about -80 ° C, and then to about 180 ° C at a rate of about 10 ° C / min. After obtaining the data of the endothermic transition curve at the time of raising the temperature, the inflection point of the endothermic transition curve is determined as the glass transition temperature.
  • the comonomer having the glass transition temperature (Tg) of about -150 ° C to about 0 ° C may be used without limitation as long as it has a glass transition temperature (Tg) of about -150 ° C to about 0 ° C.
  • a comonomer having a glass transition temperature (Tg) of about -150 ° C to about -20 ° C more specifically, a comonomer having a glass transition temperature (Tg) of about -150 ° C to about -40 ° C.
  • the comonomer is an alkyl (meth) acrylate monomer, a monomer having ethylene oxide, a monomer having propylene oxide, a monomer having an amine group, a monomer having an amide group, a monomer having an alkoxy group, a monomer having a phosphoric acid group,
  • One or more of the monomer having a sulfonic acid group, the monomer having a phenyl group, and the monomer having a silane group may have a glass transition temperature (Tg) of about -150 ° C to about 0 ° C.
  • Such comonomers are, for example, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, iso-butyl acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethyl Alkyl (meth) acrylate monomers including hexyl acrylate, dodecyl (meth) acrylate, and the like; Polyethylene oxide monomethyl ether (meth) acrylate, polyethylene oxide monoethyl ether (meth) acrylate, polyethylene oxide monopropyl ether (meth) acrylate, polyethylene oxide monobutyl ether (meth) acrylate, polyethylene oxide monopentyl ether ( Contains alkylene oxide groups including meth) acrylate, polypropylene oxide monomethyl ether (meth) acrylate, polypropylene oxide monoethyl ether (meth) acrylate
  • the monomer mixture may include a (meth) acrylate monomer having a hydroxyl group and a comonomer having a glass transition temperature (Tg) of about -150 ° C to about 0 ° C.
  • the comonomer having a glass transition temperature (Tg) of about ⁇ 150 ° C. to about 0 ° C. in the monomer mixture may include about 60% to about 95% by weight, for example, about 70% to about 90% by weight. In this range, there is an excellent effect of excellent adhesion and reliability.
  • the (meth) acrylate having a hydroxyl group may be included in about 5 to about 40% by weight, for example about 10 to about 30% by weight of the monomer mixture. The haze is low in the above range, there is an effect excellent in adhesion.
  • the monomer mixture may further include a monomer having a carboxyl group.
  • the monomer having a carboxyl group is (meth) acrylic acid, 2-carboxyethyl (meth) acrylate, 3-carboxypropyl (meth) acrylate, 4-carboxybutyl (meth) acrylate, itaconic acid, crotonic acid, maleic acid, Fumaric acid and maleic anhydride, and the like, but are not necessarily limited thereto.
  • the monomer having a carboxyl group may further include about 10% by weight or less, specifically about 5% by weight or less, more specifically about 1% by weight or less of the total monomer mixture.
  • the adhesive strength is high, and there is an excellent effect of reliability.
  • the pressure-sensitive adhesive composition or the pressure-sensitive adhesive film includes organic particles, thereby having excellent low temperature and / or room temperature viscoelasticity, and having a crosslinked structure, thereby stably expressing high temperature viscoelasticity.
  • the organic particles may form a chemical bond with the (meth) acrylic copolymer having the hydroxyl group.
  • the pressure-sensitive adhesive composition or the pressure-sensitive adhesive film has excellent transparency by having a specific refractive index difference with the (meth) acrylic copolymer having the following specific average particle size organic particles and the following hydroxyl group, even though the organic particles are included. Can be.
  • the organic particles may have an average particle diameter of about 10 nm to about 400 nm.
  • the organic particles have an average particle diameter of about 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390 or 400 nm.
  • the organic particles may have an average particle diameter in a range of at least one of the above values and at most one of the above values. Specifically about 10 nm to about 300 nm, more specifically about 10 nm to about 200 nm. In the above range, the aggregation of organic particles can be prevented and the transparency is excellent.
  • the organic particles may have a refractive index difference from the (meth) acrylic copolymer having a hydroxyl group of about 0.05 or less, specifically about 0 or more and about 0.03 or less, specifically about 0 or more and about 0.02 or less. In the above range, the transparency of the pressure-sensitive adhesive film is excellent.
  • the organic particles have a core-shell structure, and the glass transition temperature of the core and the shell may satisfy the following Equation 2.
  • Tg (c) is the glass transition temperature (° C.) of the core
  • Tg (s) is the glass transition temperature (° C.) of the shell.
  • the glass transition temperature of the core may be about -150 °C to about 10 °C, specifically about -150 °C to about -5 °C, more specifically about -150 °C to about -20 °C. In the above range, it is possible to realize a storage modulus value required at low temperature (about -20 ° C), and excellent low temperature and / or room temperature viscoelastic properties.
  • the core may include at least one polyalkyl (meth) acrylate having the glass transition temperature.
  • the core may be polymethyl acrylate, polyethyl acrylate, polypropyl acrylate, polybutyl acrylate, polyisopropyl acrylate, polyhexyl acrylate, polyhexyl methacrylate, polyethylhexyl acrylate and And may include, but are not necessarily limited to, one or more of polyethylhexyl methacrylates.
  • it may include one or more of polybutyl acrylate and polyethylhexyl acrylate.
  • the glass transition temperature of the shell may be about 15 ° C to about 150 ° C, specifically about 35 ° C to about 150 ° C, more specifically about 50 ° C to about 140 ° C.
  • the (meth) acrylic copolymer having a hydroxyl group in the above range has an advantage of excellent dispersibility of organic particles.
  • the shell may comprise a polyalkyl (meth) acrylate having the glass transition temperature.
  • a polyalkyl (meth) acrylate having the glass transition temperature.
  • PMMA polymethyl methacrylate
  • PMMA polyethyl methacrylate
  • polypropyl methacrylate polybutyl methacrylate
  • polyisopropyl methacrylate polyisobutyl methacrylate
  • polycyclohexyl methacrylate It may include one or more of the rate, but is not necessarily limited thereto.
  • it may include polymethyl methacrylate.
  • the core or the shell comprises two or more layers, and the outermost layer of the organic particles may comprise one sheet of polyalkyl (meth) acrylate having a glass transition temperature of about 15 ° C to about 150 ° C.
  • the core may include at least one polyalkyl (meth) acrylate having a glass transition temperature of about ⁇ 150 ° C. to about 10 ° C., and at least one polyalkyl (meth) acrylate without limiting the glass transition temperature.
  • the glass transition temperature of the entire core may satisfy about -150 °C to about 10 °C, but is not necessarily limited thereto.
  • the shell may also include one or more polyalkyl (meth) acrylates having a glass transition temperature of about 15 ° C. to about 150 ° C., and include one or more polyalkyl (meth) acrylates without limiting the glass transition temperature.
  • the glass transition temperature of the entire shell may satisfy about 15 ° C. to about 150 ° C., but is not necessarily limited thereto.
  • the shell may comprise about 1% to about 70% by weight, specifically about 5% to about 60% by weight, more specifically about 10% to about 50% by weight of the organic particles.
  • the viscoelastic properties are maintained in a wide temperature range, the recovery force of the adhesive film is excellent.
  • the organic particles are about 0.1 parts by weight to about 15 parts by weight, specifically about 0.1 parts by weight to about 10 parts by weight, and more specifically, based on 100 parts by weight of the monomer mixture forming the (meth) acrylic copolymer having a hydroxyl group. About 0.1 part by weight to about 8 parts by weight. There is an effect having excellent adhesion and reliability in the above range.
  • the (meth) acrylic copolymer having a hydroxyl group has about 5% to about 40% by weight of the (meth) acrylate having a hydroxyl group, specifically about 10% to about 30% by weight and a comonomer (e.g. Comonomers having a glass transition temperature (Tg) of from about -150 ° C to about 0 ° C) from about 60% to about 95% by weight, specifically from about 70% to about 90% Can be.
  • Tg glass transition temperature
  • the (meth) acrylic copolymer having a hydroxyl group comprises about 5% to about 40% by weight of (meth) acrylate having a hydroxyl group, such as about 10% to about 30% by weight, comonomer (e.g. Comonomers having a glass transition temperature (Tg) of about -150 ° C to about 0 ° C) about 60% to about 95% by weight, for example about 70% to about 90% by weight, about 0 monomers having a carboxyl group It may be formed from a monomer mixture comprising from about 10% to about 10% by weight, for example from about 0.1% to about 1% by weight. There is an effect having excellent adhesion and reliability in the above range.
  • comonomer e.g. Comonomers having a glass transition temperature (Tg) of about -150 ° C to about 0 ° C
  • Tg glass transition temperature
  • the organic particles included in the pressure-sensitive adhesive composition may be polymerized with the monomer mixture to form a (meth) acrylic copolymer having a hydroxyl group.
  • the organic particles may be used in a polymerized state together with the monomer mixture. In this case, the organic particles may be used in a state contained in the (meth) acrylic copolymer having a hydroxyl group.
  • the pressure-sensitive adhesive composition may include organic particles together with a (meth) acrylic copolymer having hydroxyl groups already polymerized from the monomer mixture.
  • the organic particles may be included in the pressure-sensitive adhesive composition in a state separate from the (meth) acrylic copolymer having a hydroxyl group.
  • the glass transition temperature of the (meth) acrylic copolymer having a hydroxyl group may be about -150 ° C to about -13 ° C, specifically about -100 ° C to about -20 ° C, while having excellent foldability in the above range, It has the effect of excellent adhesion and reliability over a wide temperature range.
  • the (meth) acrylic copolymer having a hydroxyl group may be prepared by mixing a monomer mixture, organic particles, and a radical photopolymerization initiator, solution polymerization, suspension polymerization, photopolymerization, bulk polymerization, dispersion polymerization or emulsion polymerization.
  • organic particles may be added to the prepolymer to prepare a (meth) acrylic copolymer having a hydroxyl group.
  • the emulsion polymerization may be performed at about 25 ° C. to about 100 ° C. by adding an initiator to a dispersant, a crosslinking agent and a monomer mixture, and organic particles in an aqueous solution.
  • the pressure-sensitive adhesive composition may further include one or more of a crosslinking agent and an initiator.
  • Crosslinking agents are polyfunctional (meth) acrylates, for example 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentylglycol di (meth) acrylate, Polyethylene glycol di (meth) acrylate, neopentylglycol adipate di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (meth) acrylic Ethylene Oxide Modified Di (meth) acrylate, Di (meth) acryloxyethyl Isocyanurate, Allylated Cyclohexyl Di (meth) acrylate, Tricyclodecanedimethanol (meth) acrylate, Dimethylol Dish Clopentane di (meth) acrylate, ethylene oxide modified hexahydrophthalic acid di (meth)
  • the crosslinking agent may be a polyfunctional ( By using meth) acrylate, there exists an effect which has the outstanding durability reliability.
  • the crosslinking agent is about 0.01 parts by weight to about 10 parts by weight, specifically about 0.03 parts by weight to about 7 parts by weight, specifically about 0.1 parts by weight to 100 parts by weight of the monomer mixture forming the (meth) acrylic copolymer having a hydroxyl group. About 5 parts by weight. There is an effect of excellent adhesion and increased reliability in the above range.
  • the initiator may use a radical photopolymerization initiator or a thermal polymerization initiator.
  • the initiator may be the same as or different from the initiator used in the preparation of the (meth) acrylic copolymer having a hydroxyl group. In other embodiments, a thermal polymerization initiator can be used.
  • any photoinitiator as long as it can induce the polymerization reaction of the radically polymerizable compound mentioned above in the hardening process by light irradiation etc., and can implement
  • benzoin benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether , Benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylanino acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2 -Hydroxy-2-methyl-1-phenylpropane-1one, 1-hydroxycyclohexylphenylketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1- On, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4-nonsidiethylaminobenzophenone, dichlorobenzophenone, 2 -Methylanth
  • the kind of thermal polymerization initiator is not particularly limited as long as it has the above-described physical properties.
  • a common initiator such as an azo compound, a peroxide compound, or a redox compound can be used.
  • the azo compound in the above are 2,2-azobis (2-methylbutyronitrile), 2,2-triazobis (isobutyronitrile), 2,2-triazobis (2,4-dimethyl Valeronitrile), 2,2-nitazobis-2-hydroxymethylpropionitrile, dimethyl-2,2-methylazobis (2-methylpropionate) and 2,2-piazobis (4- Methoxy-2,4-dimethylvaleronitrile) and the like
  • the peroxide-based compound include inorganic peroxides such as potassium peroxide, ammonium persulfate or hydrogen peroxide; Or diacyl peroxide, peroxy dicarbonate, peroxy ester, tetramethylbutylperoxy neodecanoate, bis (4-butyl
  • Examples of the compound include, but are not limited to, a mixture using a peroxide compound and a reducing agent in combination.
  • a peroxide compound and a reducing agent in combination.
  • one kind or a mixture of two or more kinds of the azo-based, peroxide-based or redox-based compounds may be used.
  • the initiator is about 0.01 to about 5 parts by weight, specifically about 0.05 to about 3 parts by weight, and more specifically about 0.1 parts by weight to 100 parts by weight of the monomer mixture forming the (meth) acrylic copolymer having a hydroxyl group. About 1 part by weight. In the above range, the curing reaction may proceed completely, and remaining amount of initiator may remain to prevent a decrease in transmittance, and also may lower bubble generation and have excellent reactivity.
  • the pressure-sensitive adhesive composition may further include a silane coupling agent.
  • the silane coupling agent may further include a siloxane-based or epoxy-based silane coupling agent, but is not limited thereto.
  • the silane coupling agent may be included in an amount of about 0.01 parts by weight to about 0.1 parts by weight, specifically about 0.05 parts by weight to about 0.1 parts by weight, based on 100 parts by weight of the monomer mixture forming the (meth) acrylic copolymer having a hydroxyl group. There is an effect of increasing the reliability in the above range.
  • the pressure-sensitive adhesive composition may optionally include a curing accelerator, an ionic liquid, a lithium salt, an inorganic filler, a softener, a molecular weight regulator, an antioxidant, an antioxidant, a stabilizer, a tackifying resin, a modified resin (polyol resin, a phenol resin, an acrylic resin, a polyester resin).
  • a curing accelerator an ionic liquid, a lithium salt, an inorganic filler, a softener, a molecular weight regulator, an antioxidant, an antioxidant, a stabilizer, a tackifying resin, a modified resin (polyol resin, a phenol resin, an acrylic resin, a polyester resin).
  • Polyolefin resins epoxy resins, epoxidized polybutadiene resins, etc.
  • leveling agents antifoaming agents, plasticizers, dyes, pigments (colored pigments, sieving pigments, etc.), treatment agents, sunscreen agents, fluorescent brighteners, dispersants, thermal stabilizers, Conventional additives such as light stabilizers, ultraviolet absorbers, antistatic agents, flocculants, lubricants and solvents may be further included.
  • the pressure-sensitive adhesive composition may further include a non-curable compound.
  • the pressure-sensitive adhesive composition may have a viscosity of about 300 to about 50,000 cPs at 25 ° C., and may have an effect of obtaining excellent coating property and thickness uniformity in the above range.
  • the flexible display device 100 including the adhesive film may include an optical device portion 91 and a first adhesive film 92 formed on the optical device portion 91. ), The touch function unit 93 formed on the first adhesive film 92 (a), the second adhesive film 92 (b) formed on the touch function unit 93, and the second adhesive film 92 ( b)) a window film 95 formed on it.
  • the optical element unit 91 may be applied without limitation as long as it is made of a flexible material, and may be, for example, an LCD including an OLED, an LED, or a light source.
  • the optical device unit 91 may have a touch function unit 93 formed on an LCD panel having an OLED, an LED, or a light source, and the touch function unit 93 may be in contact with the polarizer 94.
  • An adhesive film of the present invention may be interposed between the LCD panel having the OLED, the LED or the light source, and the touch function unit 93.
  • the touch function unit 93 detects an electrical signal by a touch of a finger or the like, and may be formed of a material having flexibility. Specifically, a conductor in which a metal nanowire, which is a flexible conductive material having flexibility, and a conductive film containing a conductive polymer are patterned can be used. For example, the touch function unit 93 may form the conductor on a substrate layer (not shown). The touch function unit 93 can be applied to a conventional one, it is easy to purchase commercial. The lower portion of the touch function unit 93 may be stacked on the optical device unit 91 via the first adhesive film 92 (a).
  • the window film 95 can apply a conventional thing, and is easy to purchase commercially.
  • the window film 95 may be formed of an optically transparent and flexible resin, and may be formed of a base layer and a hard coating layer.
  • the substrate layer include polyester resins such as polyethylene terephthalate polyethylene naphthalate, polybutyl terephthalate and polybutylene naphthalate, polycarbonate resins, polyimide resins, polystyrene resins, polymethyl methacrylates, and the like. It may be made of any one or more of the containing poly (meth) acrylate resin.
  • the hard coating layer has a pencil strength of 6H or more, it may be formed of a siloxane resin.
  • the second adhesive film 92 (b) may be made of the same material as the first adhesive film 92 (a).
  • the same material' means that the ingredients and the physical properties are the same.
  • the second adhesive film 92 (b) may be made of a material different from that of the first adhesive film 92 (a).
  • the thickness of the first adhesive film 92 (a) may be thicker than that of the second adhesive film 92 (b). Therefore, the first adhesive film 92 (a) has a higher adhesive force than the second adhesive film 92 (b), the reliability of the flexible display device is high, there is an advantage that can flatten the optical element portion.
  • the flexible display apparatus 200a or 200b may further include a polarizer 94 formed on the touch function 93 or the first adhesive film 92 (a).
  • the polarizer 94 may be formed on the touch function unit 93, and the second adhesive film 92 according to the embodiment of the present invention may be formed on the touch function unit 93.
  • the window film 95 may be laminated via b)).
  • the polarizer 94 may be stacked on the optical device unit 91 via the first adhesive film 92 (a).
  • the polarizer 94 polarizes natural or artificial light, and dyes iodine or dichroic dye on a modified polyvinyl alcohol film or polyolefin film such as a partially formalized polyvinyl alcohol film, an acetoacetyl group modified polyvinyl alcohol film, and the like. It is produced by stretching in a constant direction. Specifically, it is prepared through the swelling process, the dyeing step, the stretching step. Methods of performing each step are commonly known to those skilled in the art.
  • the polarizer 94 may be applied to a conventional one, it is easy to purchase commercially.
  • the conductor may be formed on the base layer, and the base layer may include the polarizer 98. It may include.
  • composition used to prepare the adhesive film is as follows.
  • the core is a poly-butyl acrylate (PBA)
  • the shell is a poly-methyl methacrylate (PMMA) core-shell structure
  • the shell is 40% by weight of the organic particles
  • the average particle diameter is 230 nm
  • the core is a core-shell structure consisting of polybutyl acrylate (PBA), the shell is polymethyl methacrylate (PMMA), the shell is 30% by weight of the organic particles, the average particle diameter is 230 nm, the refractive index ( N B ) used 1.48 organic particles.
  • PBA polybutyl acrylate
  • PMMA polymethyl methacrylate
  • N B refractive index
  • the core is a core-shell structure consisting of polybutyl acrylate (PBA), the shell is polymethyl methacrylate (PMMA), the shell is 30% by weight of the organic particles, the average particle diameter is 130 nm, the refractive index ( N B ) used organic particles having a size of 1.48.
  • PBA polybutyl acrylate
  • PMMA polymethyl methacrylate
  • N B refractive index
  • the core is a poly-ethylhexyl acrylate (PEHA)
  • the shell is a core-shell structure consisting of polymethyl methacrylate (PMMA)
  • the shell is 30% by weight of the organic particles
  • the average particle diameter is 140 nm
  • Refractive index (N B ) was used organic particles of 1.48.
  • the resulting pressure-sensitive adhesive composition was coated on a polyester film (release film, polyethylene terephthalate film, 50 ⁇ m thick) to form an adhesive film having a thickness of 100 ⁇ m. After covering the release film having a thickness of 75 ⁇ m on the top, and irradiated on both sides using a low pressure lamp (BL Lamp manufactured by Sankyo) for about 6 minutes to obtain a transparent adhesive sheet.
  • BL Lamp low pressure lamp manufactured by Sankyo
  • a transparent adhesive sheet was prepared in the same manner as in Preparation Example 1, except that the content of each component in Preparation Example 1 was changed as in Table 1 below.
  • a transparent adhesive sheet was manufactured by the same method as Preparation Example 1, and hot air drying was further performed at 80 ° C. for 20 minutes and at 100 ° C. for 5 minutes.
  • Viscoelasticity was measured under auto strain conditions at a shear rate of 1 rad / sec and strain of 1% using ARES (Anton Paar, MCR-501), a dynamic viscoelasticity measuring device. After removing the release film, the adhesive film was laminated to a thickness of 500 ⁇ m, and the laminate was punched out using a puncher having a diameter of 8 mm to be used as a specimen. The measurement was carried out using a jig of 8 mm at a temperature rise rate of 5 °C / min in the temperature range of -60 °C to 90 °C, the elastic modulus was recorded at -20 °C, 25 °C, 80 °C.
  • Mo (80 ° C) is the storage modulus at 80 ° C
  • Mo (-20 ° C) is the storage modulus at -20 ° C)
  • T-peel peel strength Corona treatment twice (total dose) on a PET film of width ⁇ length ⁇ thickness (150 mm ⁇ 25 mm ⁇ 75 ⁇ m) while discharging at a dose of 78 doses using a corona treatment machine. : 156 dose).
  • the adhesive film sample was obtained by the magnitude
  • the corona treated surface of the PET film was laminated on both surfaces of the adhesive film sample, thereby preparing the specimen shown in FIG.
  • the specimens were autoclaved at pressure of 3.5 bar at 50 ° C.
  • one PET film was fixed at 60 ° C., and the other PET film was pulled at a rate of 50 mm / min to measure T-Peel peel strength at 60 ° C.
  • Haze meter Nippon Denshoku company model NDH 5000
  • ASTM American Society for Testing and Measurement
  • Test Method D 1003-95 (“Standard Test for Haze and Luminous Transmittance of Transparent Plastic”). Haze was measured.
  • Bubble generation area (%) 50 ⁇ m thick PET on one side of the adhesive film (13 cm ⁇ 3 cm, thickness 100 ⁇ m) and 100 ⁇ m thick PET laminated on the back side of the adhesive film Bending in the direction of 50 ⁇ m PET so that the horizontal length of the adhesive film is 1/2 between the parallel frame of 1 cm intervals and aged for 24 hours at a temperature of 70 °C, 93% humidity and an optical microscope (Olympus, The image measured by EX-51) was analyzed by Macech's Mac-view software, and the ratio of the bubble size to the area to the area was measured (%).
  • PC film coated with a transparent electrode 50um Teijin chemical PC film was prepared by coating a silver nanowire containing solution (Clearohm-A G4-05, Cambrios, Inc., including silver nanowires and a binder).
  • Second adhesive film A 50 ⁇ m adhesive film was formed from the composition of Preparation Example 1.
  • PET film 100um Cosmoshine TA015, Toyobo, thickness: 100um
  • a flexible display device was manufactured in the same manner as in Example 1, except that Preparation Examples 2 to 8 were used as an adhesive composition for forming an adhesive film.
  • a flexible display apparatus was manufactured in the same manner as in Example 1, except that Preparation Example 9 was used as an adhesive composition for forming an adhesive film.
  • Example Comparative example One 2 3 4 5 6 7 8 One Bubble generation area (%) 0 0 0 0 0 0 0 0 0 0 3.22
  • the embodiment to which the adhesive film of the present invention is applied can be seen that the reliability is excellent as the bubble generation area 0%.
  • Bubble generation area (%) The manufactured display device (replacement of the window film with PET film (thickness of 100 ⁇ m)) was bent in the direction of the PET film (thickness of 100 ⁇ m) between parallel frames of 1 cm interval, and the temperature was 70 ° C. After aging at 93% humidity for 24 hours and measuring the adhesive film with an optical microscope (Olympus, EX-51, 30x), Mountech's Mac-view software was used to analyze the bubble size and size. It is the value (%) which measured the ratio of the area to occupy.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Electroluminescent Light Sources (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)

Abstract

La présente invention concerne un dispositif d'affichage flexible comprenant : une unité d'élément optique ; un premier film adhésif formé sur l'unité d'élément optique ; une unité de fonction tactile formée sur le premier film adhésif ; un second film adhésif formé sur l'unité de fonction tactile ; et un film de fenêtre formé sur le second film adhésif, le premier film adhésif ou le second film adhésif présentant une répartition de module de conservation dépendant de la température qui, lorsque la température est tracée sur l'axe x (°C) et le module de conservation est tracé sur l'axe y (KPa), présente une pente moyenne d'environ -9,9 à environ 0 à -20 °C à 80 °C en référence à l'axe x, et le premier film adhésif ou le second film adhésif présente un module de conservation supérieur ou à égal à environ 10 KPa à 80 °C.
PCT/KR2015/011603 2014-11-01 2015-10-30 Dispositif d'affichage flexible Ceased WO2016068661A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15854252.2A EP3214531B1 (fr) 2014-11-01 2015-10-30 Dispositif d'affichage flexible
US15/522,253 US10669450B2 (en) 2014-11-01 2015-10-30 Flexible display device
CN201580058757.9A CN107077247B (zh) 2014-11-01 2015-10-30 可挠式显示装置

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR20140153211 2014-11-01
KR10-2014-0153211 2014-11-01
KR20140150799 2014-11-01
KR10-2014-0150799 2014-11-01
KR10-2014-0156463 2014-11-11
KR20140156463 2014-11-11
KR10-2015-0150670 2015-10-29
KR1020150150670A KR101659239B1 (ko) 2014-11-01 2015-10-29 플렉시블 디스플레이 장치

Publications (2)

Publication Number Publication Date
WO2016068661A2 true WO2016068661A2 (fr) 2016-05-06
WO2016068661A3 WO2016068661A3 (fr) 2016-06-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018159923A1 (fr) * 2017-02-28 2018-09-07 동우화인켐 주식회사 Film de fenêtre, stratifié de film de fenêtre le comprenant et dispositif d'affichage d'image
CN109118963A (zh) * 2017-06-23 2019-01-01 三星显示有限公司 电子设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100002638A (ko) * 2008-06-30 2010-01-07 동우 화인켐 주식회사 광학필름용 점착제 조성물, 이를 이용한 광학필름 및액정표시장치
KR101640631B1 (ko) * 2012-12-12 2016-07-18 제일모직주식회사 편광판용 접착 필름, 이를 위한 접착제 조성물, 이를 포함하는 편광판 및 이를 포함하는 광학 표시 장치
KR102077859B1 (ko) * 2013-01-09 2020-02-14 도레이첨단소재 주식회사 개선된 광학 특성을 갖는 터치스크린용 점착 수지 조성물 및 점착필름
JP6097589B2 (ja) * 2013-02-13 2017-03-15 リンテック株式会社 粘着性組成物、粘着剤および粘着シート
KR102078831B1 (ko) * 2013-03-12 2020-04-03 삼성디스플레이 주식회사 플렉서블 터치 스크린 패널을 구비한 플렉서블 표시장치

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018159923A1 (fr) * 2017-02-28 2018-09-07 동우화인켐 주식회사 Film de fenêtre, stratifié de film de fenêtre le comprenant et dispositif d'affichage d'image
CN109118963A (zh) * 2017-06-23 2019-01-01 三星显示有限公司 电子设备
US11183651B2 (en) 2017-06-23 2021-11-23 Samsung Display Co., Ltd. Electronic apparatus

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