WO2007139174A1 - 粘着剤付き偏光フィルム、光学積層体及び偏光フィルムのセット - Google Patents
粘着剤付き偏光フィルム、光学積層体及び偏光フィルムのセット Download PDFInfo
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- WO2007139174A1 WO2007139174A1 PCT/JP2007/061043 JP2007061043W WO2007139174A1 WO 2007139174 A1 WO2007139174 A1 WO 2007139174A1 JP 2007061043 W JP2007061043 W JP 2007061043W WO 2007139174 A1 WO2007139174 A1 WO 2007139174A1
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- Prior art keywords
- film
- adhesive layer
- polarizing film
- adhesive
- pressure
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
- C09J2301/162—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer the carrier being a laminate constituted by plastic layers only
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2423/00—Presence of polyolefin
- C09J2423/006—Presence of polyolefin in the substrate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon
Definitions
- the present invention relates to a polarizing film with an adhesive that is used by being bonded to a glass cell for liquid crystal display, an optical laminated body in which the polarizing film is bonded to a glass cell for liquid crystal display, and a glass cell for liquid crystal display. It is related with the set of the polarizing film for.
- the present invention also relates to a method for producing a polarizing film with an adhesive.
- Liquid crystal display glass cells commonly used in liquid crystal display devices such as TN (Twisted Nematic) and STN (Super Twisted Nematic) have a structure in which the liquid crystal component is sandwiched between two glass substrates. have.
- optical films such as a polarizing film, a retardation film, and an antireflection film are laminated via an adhesive mainly composed of an acrylic resin.
- a surface treatment layer such as an antireflection layer is provided on the display surface side surface of the polarizing film. Therefore, an optical laminate formed by laminating the surface treatment layer, the polarizing film, the Z adhesive layer, the glass cell for liquid crystal display / the adhesive layer, and the Z polarizing film in general is used.
- the pressure-sensitive adhesive layer in such an optical laminate has a large dimensional change due to expansion and contraction under heat or wet heat conditions. Therefore, foaming occurs in the pressure-sensitive adhesive layer of the obtained optical laminate, or between the pressure-sensitive adhesive layer and the glass substrate. There was a problem that floating and peeling occurred. Furthermore, the distribution of residual stress acting on the surface treatment layer and the optical film such as polarizing film under heat or wet heat conditions becomes non-uniform, resulting in stress concentration at the outer periphery of the optical laminate. Occasionally, a phenomenon called hollowing occurs in which the outer peripheral portion becomes whitish, and the STN liquid crystal cell has a problem that color unevenness occurs in the outer peripheral portion.
- liquid crystal display devices are also used for in-vehicle applications such as a force navigation system, but in such in-vehicle applications, foaming, floating, peeling, even under high temperature and high humidity conditions, Durability that does not cause appearance changes such as cloudiness is also required.
- JP-A-2006-77224 discloses that a gel fraction is set to 10 to 50% by weight by blending a crosslinking agent with two kinds of acrylic resins having different weight average molecular weights.
- An optical laminate with a polarizing film pasted on both sides of a liquid crystal display glass cell via this adhesive is white even when exposed to high-temperature drying conditions and high-temperature and high-humidity conditions. It is described that generation
- Patent Document 1 describes that the optical film provided with the pressure-sensitive adhesive disclosed therein is excellent in such reworkability.
- polarizing films have a structure in which a polarizer made of a polyvinyl alcohol resin is sandwiched from both sides by a protective film made of an acetyl cellulose resin typified by triacetyl cellulose. There is an attempt to change at least one of them to an amorphous cyclic polyolefin-based resin film using norbornene or the like as a monomer.
- a polarizing film in which protective films are laminated on both sides of a polarizer at least one of the protective films is a film having a retardation function made of a thermoplastic norbornene resin. It is described to do.
- JP 2005-208456 discloses a structure in which a cyclic polyolefin resin film is laminated on one surface of a polarizer made of polyvinyl alcohol resin, and an acetyl cellulose film is laminated on the other surface. It is disclosed.
- a first polarizing film consisting of an amorphous cyclic polyolefin resin film / polarizer Z protective film is coated with an adhesive layer on the amorphous cyclic polyolefin resin film side.
- a second polarizing film in which a acetyl cellulose cellulose protective film is bonded to both sides of the polarizer is laminated via an adhesive layer.
- a pressure sensitive adhesive with a low gel fraction and high flexibility was applied to both sides of a glass substrate
- a high temperature eg 80 drying conditions
- a long time eg 100 hours
- the adhesive It has become clear that due to insufficient cohesive strength, there is a possibility that the durability may be insufficient due to floating, peeling, or bubbles between the adhesive layer and the amorphous cyclic polyolefin resin film.
- a polarizing film composed of an amorphous cyclic polyolefin resin film Z polarizer / protective film is provided on both sides of a liquid crystal display glass cell via an adhesive layer on the amorphous cyclic polyolefin resin film side. In laminating, it has become clear that the same problem still occurs even when an adhesive having a low gel fraction and high flexibility is applied.
- an adhesive having a high gel fraction is applied to a polarizing film in which an amorphous cyclic polyolefin resin film is bonded to one side of a polarizer. It has been found effective to apply the agent. Then, the first polarizing film having the structure of the amorphous cyclic polyolefin resin film Z polarizer protective film is provided on one side of the glass cell for liquid crystal display via the first adhesive layer. When the second polarizing film is laminated on the other side of the glass cell, and the second polarizing film is bonded to both sides of the polarizer, the glass for liquid crystal display is used.
- Adhesive to be bonded to both sides of the cell As a result, it was found that it is more effective to use a different pressure-sensitive adhesive.
- a polarizing film composed of an amorphous cyclic polyolefin resin film-no-polarizer Z protective film is provided on both sides of the liquid crystal display glass cell via an adhesive layer, respectively, on the amorphous cyclic polyolefin resin film side. It was also found that it is advantageous to form each adhesive layer with an adhesive having a high gel fraction when laminating with. The present invention has been completed based on such findings and further various studies.
- the present invention from the first point of view, it is provided on the outer side of the amorphous cyclic polyolefin resin film, the polarizing film comprising the polarizer / protective film, and the amorphous cyclic polyolefin resin film.
- the pressure-sensitive adhesive layer is preferably formed of a pressure-sensitive adhesive in which a crosslinking agent is blended with an acrylic resin.
- a brightness enhancement film can be laminated on the outside of the protective film.
- an optical laminated body in which a polarizing film with an adhesive specified from the first standpoint is attached to one side of a glass cell for liquid crystal display on the sticking layer side.
- a preferred form of this optical laminate is a first polarizing film comprising a structure of an amorphous cyclic polyolefin resin film Z polarizer protective film via a first adhesive layer on one side of a glass cell for liquid crystal display.
- the second polarizing film in which an amorphous ring-shaped polyolefin resin film is adhered to the glass cell and the other side of the glass cell is bonded with an acetyl cellulose-based protective film on both sides of the polarizer.
- the first adhesive layer has a gel fraction of 75 to 95% by weight
- the second adhesive layer has a gel fraction of 3 0 to 70% by weight.
- the second polarizing film can have a surface treatment layer on the surface opposite to the second adhesive layer.
- optical laminate is an amorphous cyclic polyolefin-based resin film Z polarizer / protective film on one side of a glass cell for liquid crystal display via a first adhesive layer.
- the first polarizing film having the structure of the film is stuck on the amorphous cyclic polyolefin resin film side, and on the other surface of the glass cell, the amorphous cyclic polyolefin resin film Z polarizer protective film
- a second polarizing film having the following structure is stuck on the amorphous cyclic polyolefin resin film side, and both the first adhesive layer and the second adhesive layer have a gel fraction of 7 5 to 9 5% by weight.
- the second polarizing film can have a surface treatment layer on the surface opposite to the second adhesive layer.
- a set of polarizing films for liquid crystal display devices is also provided from a third standpoint.
- This set of polarizing films is a combination of a first polarizing film with an adhesive and a second polarizing film with an adhesive, and the first polarizing film with an adhesive is an amorphous cyclic polyolefin resin film film.
- the polarizer has a first polarizing film composed of a Z protective film and a first adhesive layer provided outside the amorphous cyclic polyolefin resin film, with a second adhesive.
- the polarizing film has a second polarizing film in which a facetyl cellulose-based protective film is bonded to both sides of the polarizer, and a second adhesive layer provided on one side of the polarizing film.
- One adhesive layer has a gel fraction of 75 to 95% by weight, and the second adhesive layer has a gel fraction of 30 to 70% by weight.
- the pressure-sensitive adhesive layer is prepared so that the gel fraction is 75 to 95% by weight and provided on the surface of the amorphous cyclic polyolefin-based resin film of the polarizing film.
- a method of manufacturing is also provided.
- Amorphous cyclic polyolefin resin film Z Polarizer Polarizing film which is a protective film, has a low photoelastic coefficient of amorphous cyclic polyolefin resin film and is unlikely to cause phase change.
- the adhesive strength of the amorphous cyclic polyolefin resin film is weak, foaming, floating, peeling This is likely to occur. Therefore, in the polarizing film with an adhesive of the present invention, an adhesive layer having a high gel fraction and a high cohesive force as an adhesive layer for adhering to the glass cell for liquid crystal display on the amorphous cyclic polyolefin-based resin film side. By using the agent, the occurrence of foaming, floating, peeling, etc. can be suppressed.
- this polarizing film with an adhesive is excellent in reworkability when bonded to a glass cell for liquid crystal display.
- the optical layered body of the present invention is obtained by adhering the above-mentioned polarizing film with an adhesive to one side of a glass cell for liquid crystal display, and can suppress the occurrence of foaming, floating, peeling, etc. accompanying a temperature change or the like.
- an amorphous cyclic polyolefin-based resin film is formed on one side of a glass cell for liquid crystal display via a first adhesive layer having a high gel fraction and a large cohesive force.
- an amorphous cyclic polyolefin resin film is formed on one side of a glass cell for liquid crystal display via a first adhesive layer having a high gel fraction and a high cohesive force.
- the first polarizing film as an element is laminated, and an amorphous cyclic polyolefin resin film is formed on the other surface of the glass cell via a first adhesive layer having a high gel fraction and high cohesive force.
- the adhesion layer can be prevented from floating or peeling off from the glass substrate.
- white spots are suppressed when the glass substrate constituting the optical laminate is a TN liquid crystal cell, and color unevenness is suppressed when the glass substrate is an STN liquid crystal cell.
- These optical laminates are less susceptible to white spots even after repeated heating, do not change appearance such as floating, peeling, foaming, and clouding, and have excellent durability and a large size of 15 or more. However, optical defects such as white spots and color unevenness are suppressed.
- the glass after peeling Since adhesive residue and fogging are unlikely to occur on the substrate, another polarizing film can be pasted on the glass cell again, and the reworkability is excellent.
- the set of polarizing films according to the present invention has an amorphous cyclic polyolefin resin film, a gel fraction on the amorphous cyclic polyolefin resin film side of the first polarizing film composed of a polarizer / protective film.
- the first adhesive layer which is high and has high cohesive force, is arranged to form a first polarizing film with an adhesive, and one side of the second polarizing film is bonded with a acetyl cellulose base film on both sides of the polarizer.
- the second adhesive layer having a low gel fraction and a low cohesive force was disposed to form a second polarizing film with an adhesive, when each was bonded to a glass cell for liquid crystal display, the first Adhesive strength on the polarizing film side of the second polarizing film is enhanced, and even if stress is generated due to dimensional changes due to temperature changes etc. on the second polarizing film side, the stress is absorbed by the second adhesive layer. Do Door can be. As a result, local stress concentration is reduced, and the floating or peeling of the adhesive layer on the glass substrate is suppressed, and optical defects such as white spots due to uneven stress distribution are prevented.
- FIG. 1 is a schematic cross-sectional view showing a layer configuration example of a polarizing film with an adhesive according to the present invention.
- Fig. 2 is a schematic cross-sectional view showing an example of a polarizing film with an adhesive in which a brightness enhancement film is laminated.
- FIG. 3 is a schematic cross-sectional view showing a layer configuration example of the optical layered body according to the present invention.
- FIG. 4 is a schematic cross-sectional view showing an example of an optical laminate in which a brightness enhancement film is laminated on the first polarizing film side and a surface treatment layer is provided on the outer surface of the second polarizing film.
- FIG. 1 is a schematic cross-sectional view showing an example of a layer structure of a polarizing film with an adhesive according to the present invention.
- FIG. 2 shows an example in which a brightness enhancement film is laminated on the polarizing film with an adhesive in FIG.
- the cross-sectional schematic diagram shows.
- FIG. 3 shows a schematic cross-sectional view of a layer configuration example of a preferred embodiment of the optical laminate according to the present invention.
- FIG. 4 shows the outer side of the protective film of the first polarizing film in the optical laminate of FIG.
- An example in which a brightness enhancement film is laminated and the second polarizing film has a surface treatment layer on the side opposite to the adhesive layer is shown in a schematic cross-sectional view.
- the embodiment of the present invention will be described in detail with reference to these drawings.
- the polarizing film with an adhesive 10 of the present invention is a first polarizing film 15 comprising the structure of an amorphous cyclic polyolefin resin film 1 2 polarizer 1 3 Z protective film 14 And an adhesive layer 11 provided outside the amorphous cyclic polyolefin-based resin film 12.
- the polarizer 13 constituting the polarizing film 15 has a function of emitting polarized light with respect to incident light such as natural light. Normally, such a polarized light emission function is manifested by the function of absorbing linearly polarized light having a vibration surface in a certain direction and transmitting linearly polarized light having a vibration surface perpendicular thereto.
- the polarizer 13 can be composed of a uniaxially stretched polyvinyl alcohol resin film in which a dichroic dye such as iodine or a dichroic dye is adsorbed and oriented. Such a polarizer is generally produced by subjecting a polyvinyl alcohol resin film to uniaxial stretching, dyeing with a dichroic dye, and boric acid treatment.
- a protective film made of an amorphous cyclic polyolefin resin film 12 is disposed on one side of the polarizer 13.
- the amorphous cyclic polyolefin-based resin is a resin having a cyclic olefin as a monomer, such as norbornene polycyclic norbornene, and the degree of hydrogenation is increased by hydrogenation of the ring-opened polymer of the cyclic olefin. It may be a saturated or a copolymer of cyclic olefin and chain olefin. Of these, thermoplastic saturated norbornene resins are advantageously used. Also introduced polar group It is also effective. As a commercially available amorphous cyclic polyolefin-based resin,
- the thickness of the amorphous cyclic polyolefin-based resin film 12 is usually about 10 to 12 mm, and preferably about 20 to 80 m.
- the amorphous cyclic polyolefin-based resin film 12 may be stretched uniaxially or biaxially to exhibit a predetermined birefringence.
- the draw ratio is usually about 1.1 to 5 times, preferably 1.1 to 3 times, and the in-plane retardation value is usually about 20 to 20 nm.
- the film 12 is arranged so that the slow axis of the film 12 is parallel or orthogonal to the transmission axis of the polarizer 13, so that In the vertical front direction, it is possible to prevent the brightness and contrast from being lowered without being affected by the phase difference due to the transparent protective layer.
- there is no color change such as coloring or gradation reversal, and the region of good visibility with excellent contrast and brightness can be enlarged, and a liquid crystal display device with a wide viewing angle can be obtained.
- a protective film 14 is disposed on the other surface of the polarizer 1 3.
- a transparent resin film is used.
- the transparent resin include acetyl cellulose resins such as triacetyl cellulose and diacetyl cellulose, methacryl resins such as polymethyl methacrylate, and polyester resins. Polyolefin-based resins, polystrength-ponate resins, polyetheretherketone resins, polysulfone resins and the like.
- the resin constituting the protective film include salicylic acid ester compounds, benzophenone compounds, benzotriazole compounds, triazine compounds, cyanoacrylate compounds, and nickel complex compounds.
- An ultraviolet absorber may be blended.
- the protective film 14 is preferably composed of acetyl cellulose resin, and triacetyl cellulose film is particularly preferably used. The thickness of the protective film 14 is usually about 30 to 120 rn.
- a transparent adhesive is usually used for bonding the polarizer 13 and the amorphous cyclic polyolefin resin film 12 and the polarizer 13 and the protective film 14.
- an aqueous adhesive such as an aqueous solution of polyvinyl alcohol resin is preferably used.
- An adhesive layer 11 is provided on the outer side (the side not facing the polarizer 13) of the amorphous cyclic polyolefin-based resin film 12 that constitutes the polarizing film 15. Accordingly, in the present invention, the adhesive layer 11 has a gel fraction of 75 to 95% by weight. Hereinafter, the adhesive layer 11 will be described in detail.
- the pressure-sensitive adhesive layer 11 is generally formed from a pressure-sensitive adhesive obtained by blending an acrylic resin with a crosslinking agent. Usually, it is cured to form an adhesive layer.
- the acrylic resin used in the adhesive layer is mainly composed of structural units derived from (meth) acrylic acid alkyl esters, and includes heterocyclic groups such as free-resisting lpoxyl groups, hydroxyl groups, amino groups, and epoxy rings.
- a monomer having a polar group such as, preferably having a polar functional group (meth) may contain a structural unit derived from an acrylic acid compound.
- (meth) acrylic acid means that either acrylic acid or methacrylic acid may be used.
- (meth) acrylic acid such as (meth) acrylate is also used for the same purpose. is there.
- acrylic acid esters include methyl acrylate, acrylate acrylate, propyl acrylate, butyl acrylate, isoptyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, isooctyl acrylate, lauryl acrylate, acrylic acid Stearyl, cyclohexyl acrylate, isobornyl acrylate, benzyl acrylate, methoxyethyl acrylate, ethoxylate Acrylic acid alkyl esters, methyl methacrylate, ethyl methacrylate, propyl methacrylate, propyl methacrylate, isoptyl methacrylate, 2-ethylhexyl methacrylate, Octyl methacrylate, isooctyl methacrylate, lauryl methacrylate, stearyl methacrylate, cyclohexyl methacrylate, isobornyl meth
- the alicyclic structure is usually a cycloparaffin structure having 5 or more carbon atoms, preferably about 5 to 7 carbon atoms.
- Specific examples of the acrylate ester having an alicyclic structure include isobornyl acrylate, cyclohexyl acrylate, dicyclopentyl acrylate, cyclododecyl acrylate, methyl cyclohexyl acrylate, and trimethylcyclohex acrylate.
- methacrylic esters having an alicyclic structure Isobornyl methacrylate, cyclohexyl methacrylate, dicyclopentyl methacrylate, cyclododecyl methacrylate, methyl cyclohexyl methacrylate, trimethylcyclohexyl methacrylate, Octyl tert-butyl hexyl, methacrylic acid B like cyclohexyl phenyl and the like to.
- Examples of monomers having polar functional groups include acrylic acid, methacrylic acid, monomers having a free carboxyl group, such as 3-carboxycetylacrylate; (meth) acrylic acid 2-hydroxyethyl, (meth) ) Monomers having a hydroxyl group such as 2-hydroxypropyl acrylate, (meth) acrylic acid 2_ or 3_chloro-2-hydroxypropyl, diethylenedaricol mono (meth) acrylate; Acryloylmorpholine, vinylcaprolactam, N-vinyl-2-pyrrolidone, tetrahydrofurfuryl (meth) acrylate, force prolactone-modified tetrahydro-rofurfuryl acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate
- a monomer having a heterocyclic group such as glycidyl (meth) acrylate, 2,5-dihydrofuran; a monomer having an amino group different from
- the acrylic resin used in the adhesive layer has a structural unit derived from (meth) acrylic acid alkyl ester, usually from 6 to 99.9 parts by weight, preferably 8 parts by weight based on 100 parts by weight of the nonvolatile content. 0 to 99.6 parts by weight and the structural unit derived from the monomer having a polar functional group is usually 0.1 to 20 parts by weight, preferably 0.4 to 10 parts by weight. It is contained at a ratio of parts. When (meth) acrylic acid ester having an alicyclic structure is copolymerized, the structural unit derived therefrom is contained at a ratio of about 0 to 10 parts by weight per 100 parts by weight of the nonvolatile content of the acrylic resin.
- the acrylic resin used in the present invention may contain a structural unit derived from a monomer other than an acrylic ester and a monomer having a polar functional group, including the alkyl ester described above.
- a structural unit derived from a styrene-based monomer a structural unit derived from a vinyl-based monomer, a structural unit derived from a monomer having a plurality of (meth) acryloyl groups in the molecule, and the like.
- a structural unit derived from a monomer other than an acrylic ester and a monomer having a polar functional group including the alkyl ester described above. Examples of these include a structural unit derived from a styrene-based monomer, a structural unit derived from a vinyl-based monomer, a structural unit derived from a monomer having a plurality of (meth) acryloyl groups in the molecule, and the like. In monkey.
- examples of styrenic monomers include styrene, methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, jetyl styrene, triethyl styrene, propyl styrene, butyl styrene, hexyl styrene, heptyl styrene, octyl styrene.
- Alkyl styrene Alkyl styrene; halogenated styrene such as fluorostyrene, chlorostyrene, bromostyrene, dib-mouthed mostyrene, sodostyrene; and nitrostyrene, acetyl styrene, methoxy Examples include styrene and divinylbenzene.
- vinyl monomers examples include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate such as vinyl laurate; vinyl halides such as vinyl chloride and vinyl bromide; Halogenated vinylidene such as vinylidene; nitrogen-containing aromatic vinyl such as vinyl pyridine, vinyl pyrrolidone, vinyl carbazol; conjugated gen monomers such as butadiene, isoprene, chloroprene; and acrylonitrile, methacrylonitrile Can be mentioned.
- Examples of monomers having multiple (meth) acryloyl groups in the molecule include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (methyl) acrylate, 1,9-nonanediol.
- Monomers having an acryloyl group monomers having three (meth) acryloyl groups in the molecule, such as trimethylolpropane tri (meth) acrylate.
- Monomers other than the (meth) acrylic acid ester and the monomer having a polar functional group can be used alone or in combination of two or more.
- structural units derived from monomers other than (meth) acrylic acid esters and monomers having a polar functional group are usually 0 to 20 parts per 100 parts by weight of the resin. Part by weight, preferably 0 to 10 parts by weight.
- the active ingredient of the adhesive layer 1 1 is an acrylic resin containing a structural unit derived from a monomer having a polar functional group, the main component being a structural unit derived from (meth) alkyl acrylate ester as described above. It may contain more than one type. Further, the acrylic resin has a structural unit derived from an acrylic resin different from the acrylic resin, specifically, for example, a (meth) acrylic acid alkyl ester, and does not contain a polar functional group. A mixture of krill resin and the like may also be used.
- Acrylic resin containing structural units derived from (meth) acrylic acid alkyl ester as the main component and derived from monomers having polar functional groups is a standard polystyrene equivalent weight by gel permeation chromatography (GPC).
- the average molecular weight (Mw) is preferably in the range of 1,000,000 to 2,000,000.
- the weight average molecular weight in terms of standard polystyrene is 1,000,000 or more, the adhesion at high temperature and high humidity is improved, and there is a possibility that floating or peeling occurs between the glass substrate and the adhesive layer. This is preferable because it tends to be low and reworkability tends to improve.
- the weight average molecular weight is 2,000, 000 or less, even if the size of the polarizing film bonded to the adhesive layer changes, the adhesive layer changes following the dimensional change. It is preferable because there is no difference between the brightness of the peripheral edge of the liquid crystal cell and the brightness of the center, and white spots and color unevenness tend to be suppressed.
- the molecular weight distribution represented by the ratio (MwZMn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is usually in the range of about 2 to 10.
- '' Acrylic resin (a mixture of two when two or more types are combined) is a solution prepared by dissolving it in ethyl acetate to a non-volatile content of 20% by weight.
- Viscosity can be measured with a Brookfield viscometer.
- the acrylic resin constituting the adhesive layer can be produced by various known methods such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a suspension polymerization method.
- a polymerization initiator is usually used.
- the polymerization initiator is used in an amount of about 0.001 to 5 parts by weight with respect to a total of 100 parts by weight of all monomers used in the production of the acrylic resin.
- the polymerization initiator a thermal polymerization initiator, a photopolymerization initiator ′ or the like is used.
- Photopolymerization Examples of the initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone.
- thermal polymerization initiators examples include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylpropylonitrile), 1,1'-azobis (cyclohexane-1-carponito Ril), 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitryl), dimethyl-2,2'-azobis (2-methyl) Azo compounds such as propionate), 2, 2'-azobis (2-hydroxymethylpropionitrile): lauryl peroxide, ter t-butyl hydride peroxide, benzoyl peroxide, ter t-butyl pero Xibenzoate, cumene hydride peroxide, diisopropyl peroxide dicarbonate, dipropyl peroxide dicarbonate, ter t-butyl peroxide Odecanoate, ter t-butyl peroxypivalate, organic peroxid
- the solution polymerization method is preferred as the method for producing the acrylic resin.
- a specific example of the solution polymerization method will be described.
- a desired monomer and an organic solvent are mixed, a thermal polymerization initiator is added in a nitrogen atmosphere, and the degree of ⁇ ⁇ ⁇ ⁇ , preferably 60 to 8 A method of stirring at about 0 for about 3 to 10 hours can be mentioned.
- a monomer or a thermal polymerization initiator may be added continuously or intermittently during polymerization, or may be added in a state dissolved in an organic solvent.
- organic solvent examples include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; aliphatic alcohols such as propyl alcohol and isopropyl alcohol; methyl ethyl ketone and methyl Ketones such as isoptyl keton can be used.
- a crosslinking agent is blended in the acrylic resin as described above to form an adhesive.
- the crosslinking agent used for this purpose is a compound having in the molecule at least two functional groups capable of crosslinking with polar functional groups. Specifically, isocyanate compounds, epoxy compounds, metal chelate compounds, aziridine compounds And so on.
- An isocyanate compound is a compound having at least two isocyanato groups (one NCO) in the molecule.
- tolylene diisocyanate hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate.
- examples include cyanate, hydrogenated xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthenic diisocyanate, and triphenylmethane triisocyanate.
- Adducts obtained by reacting these isocyanate compounds with polyols such as glycerol and trimethylol baked bread, and those obtained by converting isocyanate compounds into dimers and trimers are also used for the adhesive layer.
- two or more isocyanate compounds can be mixed and used.
- Epoxy compounds are compounds having at least two epoxy groups in the molecule.
- bisphenol A type epoxy resin ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin glycerin Glycidyl ether, 1, 6-hexanediol diglycidyl ether, Limethylolpropane triglycidyl ether, N, N-diglycidyl dilin, N, N, N ', N' — Tetraglycidyl m_ xylenediamine, 1, 3 — Examples include bis (N, N'-diglycidylaminomethyl) cyclohexane. Two or more types of epoxy compounds may be mixed and used.
- acetylacetone acetylacetate acetate is coordinated to a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium.
- a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium.
- Aziridine-based compounds are compounds that have at least two 3-membered ring skeletons consisting of one nitrogen atom and two carbon atoms, also called ethyleneimine, such as diphenylmethane-4,4'-bis (1 1-aziridinecarboxamide), toluene-2,4_bis (1-aziridinecarboxamide), triethylenemelamine, isophthaloylbis-1- (2-methylaziridine), tris-1-1 aziridinylphosphine oxide, hexamethylene — 1,6-bis (1-aziridincarboxamide), trimethylolpropane-tri-) 3-aziridinylpropionate, tetramethylolmethane-tri-1- / 3-aziridinylpropionate.
- ethyleneimine such as diphenylmethane-4,4'-bis (1 1-aziridinecarboxamide), toluene-2,4_bis (1-aziridinecarboxamide), triethylenemelamine, is
- crosslinking agents are preferably used. It is also effective to use an aziridine compound in combination with an isocyanate compound.
- the crosslinking agent is usually about 0.1 to 10 parts by weight, preferably 0.1 parts by weight with respect to 100 parts by weight of the non-volatile content of the acrylic resin constituting the pressure-sensitive adhesive (the total amount when two or more types are used). About 7 parts by weight is blended. Since the amount of the crosslinking agent is related to the gel fraction described later, it may be appropriately selected from the above range in accordance with the required gel fraction.
- a silane compound it is preferable to add a silane compound to the adhesive before adding a cross-linking agent.
- silane compounds include vinyl-trimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N_ (2-aminoethyl) _3-aminopropylmethyldimethoxysilane, N- (2- 1-Aminoethyl) 3-Maminopropyl trimethoxysilane, 3-Aminopropyl-triethoxysilane, 3-Glycidoxypropyltrimethoxysilane, 3-Glycidoxipyl pyrmethyldimethoxysilane, 2- (3, 4-Epoxycyclohexane Xyl) ethyl trimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyl trimethoxysilane, 3_methacryloyloxyprovir trimethoxysilane, 3-mercaptopropyltrimethoxysilane, fluoro Enyltrime
- silane-based compound a polymer or a type of polymer may be used.
- examples of polymer or oligomer type silane compounds include the following.
- 3-Mercaptopropyl trimethoxysilane-tetramethoxysilane copolymer 3-Mercappropyl-trimethoxysilane-tetraethoxysilane copolymer, 3-Mercaptopropyltriethoxysilane-tetramethoxysilane copolymer, 3-Mercaptopropyltriethoxysilane A mercaptopropyl group-containing copolymer, such as a polytetraethoxysilane copolymer;
- mercaptomethyl groups such as mercaptomethyltrimethoxysilane-tetramethoxysilane copolymer, mercaptomethyltrimethoxysilane-tetraethoxysilane copolymer, mercaptomethyltriethoxysilane-tetramethoxysilane copolymer, mercaptomethyltriethoxysilane-tetraethoxysilane copolymer
- a copolymer containing a methacryloyloxypropyl group such as
- a copolymer containing acryloyloxypropyl groups such as
- Vinyltriethoxysilane-tetraethoxysilane copolymer Vinylmethyldimethoxysilane-tetramethoxysilane copolymer, Biermethyldimethoxysilane-tetraethoxysilane copolymer, Vinylmethyl jetoxysilane-tetramethoxysilane copolymer, Vinylmethyl jetoxysilane-tetraethoxysilane copolymer
- a vinyl group-containing copolymer such as
- 3-Aminopropyltrimethoxysilane-tetramethoxysilane copolymer 3-Aminopropyltrimethoxysilane-tetraethoxysilane copolymer, 3-Aminopropyltriethoxysilane-tetramethoxysilane copolymer, 3-Aminopropyltriethoxysilane -Tetraethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-aminopropylmethyljetoxysilane-tetramethoxysilane copolymer, Amino group-containing copolymers such as 3-aminopropylmethyljetoxysilane-tetraethoxysilane copolymer.
- the compounding amount of the silane compound in the pressure-sensitive adhesive is usually about 0.001 to 10 parts by weight with respect to 100 parts by weight of the non-volatile content of the acrylic resin (when two or more types are used, the total amount). It is preferably used at a ratio of 0.1 to 5 parts by weight. It is preferable that the amount of the silane-based compound with respect to the nonvolatile content of 100 parts by weight of the acrylic resin is 0.001 part by weight or more because adhesion between the adhesive layer and the glass substrate is improved. Further, when the amount is 10 parts by weight or less, it is preferable that bleeding out of the silane compound from the adhesive layer tends to be suppressed.
- the pressure-sensitive adhesive described above may further contain a crosslinking catalyst, a weathering stabilizer, an evening fire, a plasticizer, a softening agent, a dye, a pigment, an inorganic filler, and the like.
- a crosslinking catalyst when added to the adhesive together with a crosslinking agent, the adhesive layer can be prepared by aging in a short time, and in the resulting optical laminate, there is floating or peeling between the adhesive layer and the polarizing film. It is possible to suppress the occurrence and foaming in the adhesive layer. In addition, reworkability may be further improved.
- crosslinking catalyst examples include amine compounds such as hexamethylenediamine, ethylenediamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophorone diamine, trimethylenediamine, polyamino resin, and melamine resin. And so on.
- amine compounds such as hexamethylenediamine, ethylenediamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophorone diamine, trimethylenediamine, polyamino resin, and melamine resin.
- an isocyanate compound is suitable as the crosslinking agent.
- the pressure-sensitive adhesive layer 11 has a gel fraction of 75 to 95% by weight.
- the gel fraction is a value measured according to the following (I) to (IV).
- Gel fraction (% by weight) [ ⁇ Wa- (Wb-Ws) -Wm ⁇ / (Ws -Wm)] X 1 0 0
- the gel fraction of the adhesive layer 1 1 is 75 to 95% by weight Like that.
- the gel fraction is 75% by weight or more, floating or peeling occurs between the adhesive layer 1 1 and the amorphous cyclic polyolefin resin film 1 2 constituting the polarizing film 1 5, It is preferable because foaming tends to be suppressed in the adhesive layer, and the gel fraction is preferably 95% by weight or less because it is easy to produce.
- the gel fraction of the adhesive layer 1 1 can be adjusted to 75-95% by weight, depending on the type of acrylic resin that is the active ingredient of the adhesive layer, but if the amount of cross-linking agent is increased, the gel Since the fraction increases, the gel fraction may be adjusted by the amount of the crosslinking agent.
- the blending amount of the crosslinking agent is about 0.3 to 7 parts by weight with respect to 100 parts by weight of the acrylic resin constituting the adhesive layer 11 1 (the total amount when two or more types are used). From this range, it may be appropriately selected according to the type of acryl resin.
- the thickness of the adhesive layer 11 is not particularly limited, but it is usually preferably 30 zm or less, and more preferably 10 m or more.
- the thickness of the adhesive layer is 30 or less, the adhesiveness under high temperature and high humidity is improved, and the possibility of occurrence of floating or peeling between the glass substrate and the adhesive layer tends to be reduced.
- the thickness of the adhesive layer for bonding to the glass cell for liquid crystal display has been about 25 m as a standard, but in the present invention, it is provided on the amorphous cyclic polyolefin resin film 12. It is advantageous that the adhesive layer 11 has a thickness of 2 or less. In general, when the adhesive layer is thickened, bubbles are more likely to be produced, but white spots are more likely to be suppressed. On the other hand, if the adhesive layer is made thinner, bubbles are less likely to come out, but white spots are more likely to occur.
- the amorphous cyclic polyolefin-based resin film 12 used for the polarizing film 15 has a small photoelastic coefficient as described above, so that a change in retardation due to a temperature change is small. For this reason, even if the adhesive layer 11 provided thereon is thinned, white spots caused by that side hardly occur. Even if a dimensional change occurs in the polarizing film 15 or the amorphous cyclic polyolefin resin film 12 that constitutes the polarizing film, if the adhesive layer 11 is thin, the effect of the dimensional change on the adhesive layer is small. Become.
- the thickness of the adhesive layer 1 1 is reduced to 2 O / ⁇ m or less, white spots and the like hardly occur, and further, the entire optical laminate that is bonded to a liquid crystal display glass cell is thinned. Can also contribute.
- a brightness enhancement film 17 can be laminated on the outside of the protective film 14 constituting the film 15.
- FIG. 2 is the same as FIG. 1 except that the brightness enhancement film 1 7 is arranged outside the protective film 14 (on the side opposite to the adhesive layer 1 1). The detailed explanation is omitted.
- the brightness enhancement film 17 is an optical film that can increase the utilization efficiency of backlight in a liquid crystal display device.
- Examples of brightness enhancement films include "DBEF”, a reflective polarizing separation film sold by 3M Company in the US [Sumitomo 3EM Co., Ltd. in Japan], and upward prism sheet, also sold by 3M Company.
- the polarizing film with pressure-sensitive adhesive of the present invention configured as described above is prepared by preparing a polarizing film 15 consisting of an amorphous cyclic polyolefin-based resin film 1 2 polarizer 1 3 protective film 14, Prepare a pressure-sensitive adhesive prepared so that the gel fraction is 75 to 95% by weight, and apply this pressure-sensitive adhesive to the surface of the amorphous cyclic polyolefin resin film 12 in the polarizing film 15.
- a polarizing film 15 consisting of an amorphous cyclic polyolefin-based resin film 1 2 polarizer 1 3 protective film 14
- Prepare a pressure-sensitive adhesive prepared so that the gel fraction is 75 to 95% by weight and apply this pressure-sensitive adhesive to the surface of the amorphous cyclic polyolefin resin film 12 in the polarizing film 15.
- it can be produced by the method of forming the adhesive layer 11. As shown in Fig.
- the polarizing film composed of an amorphous cyclic polyolefin resin film 1 2 Z polarizer 1 3 / protective film 14
- an organic solvent solution of the adhesive prepared so that the gel fraction is 75 to 95% by weight is directly applied.
- a method of applying and drying can be employed.
- the adhesive layer prepared so that the gel fraction is 75 to 95% by weight is peeled off from the adhesive layer 11 • It is also possible to adopt a method in which the film is formed on the surface and transferred to the surface of the amorphous cyclic polyolefin resin film 12.
- the adhesive solution diluted with the organic solvent is applied onto the release film, heated at 60 to 120 for about 0.5 to 10 minutes to remove the organic solvent, Get a layer 1 1
- an amorphous cyclic polyolefin resin film 1 2 Polarizer 1 3 Polarizing film 15 comprising the Z protective film 1 4 is applied to this adhesive layer on the amorphous cyclic polyolefin resin film 1 2 side.
- the atmosphere is room temperature (around 23) and relative humidity around 65%, it is aged for about 5 to 20 days, fully reacts with the cross-linking agent, and then peels off the release film.
- a laminate of the adhesive layer 11 and the polarizing film 15 can be obtained.
- an adhesive layer on the release film and transferring it to the surface of the amorphous cyclic polyolefin resin film 12 the following method can be mentioned. That is, according to the above, a laminate comprising a release film and an adhesive layer is obtained. When this is wound in a roll shape, the room temperature (23: around) and the relative humidity around 65% are aged for about 5 to 20 days to sufficiently react the crosslinking agent. When wound in a uniform shape, use a release film that has been subjected to release treatment on both sides. The adhesive layer may be sandwiched between the release films one after another, or another release may be applied to the exposed surface of the adhesive layer. A film may be attached.
- the adhesive layer is exposed (with a release film on one side), and an amorphous cyclic polyolefin-based resin film of polarizing film 15 on the exposed surface 1 2
- the polarizing film with an adhesive layer 10 is obtained by laminating the sides.
- the release film serves as a base material for forming the adhesive layer. It may also serve to protect the adhesive layer from foreign matter such as dust and dust during aging and when stored as a laminate of an adhesive layer and a polarizing film.
- Specific examples of the release film include a film made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polystrength, polyarylate, etc., and contact with the adhesive layer of this substrate.
- the surface include those subjected to a release treatment such as silicone treatment.
- Amorphous cyclic polyolefin-based resin film 1 2 Polarizer 1 3
- Protective film 1 4 Polarizing film composed of 4 1 Amorphous cyclic polyolefin-based resin film 1 2
- the corona discharge treatment is a treatment in which a high voltage is applied between the electrodes to discharge and activate the resin film disposed there.
- the corona discharge treatment is preferably performed with its output set at about 200 to 1,00 W.
- the output of the corona discharge treatment By setting the output of the corona discharge treatment to 200 W or more, the effect of this treatment becomes remarkable, and the adhesive force between the adhesive layer 11 and the amorphous cyclic polyolefin resin film 12 is improved. In addition, by setting the output of the corona discharge treatment to 1, 00 0 W or less, dust that tends to be generated by this treatment is reduced.
- the effect of corona discharge treatment varies depending on the type of electrode, electrode interval, voltage, humidity, type of resin film used, etc.For example, the electrode interval is 1 to 5 mm and the moving speed is 3 to 2 O mZ It is preferable to set the degree.
- the polarizing film with pressure-sensitive adhesive 10 described above can be made into an optical laminate for liquid crystal display by being bonded to the glass cell for liquid crystal display on the pressure-sensitive adhesive layer 11 side.
- a polarizing film can be attached to the other surface of the glass cell for liquid crystal display through the same adhesive layer as the adhesive layer 11 described above, but in order to suppress optical defects such as white spots, a polarizer is used.
- a polarizing film having a structure in which a acetyl cellulose cellulose protective film is bonded on both sides of the polarizing plate is bonded via an adhesive layer having a gel fraction lower than that of the opposite adhesive layer 11.
- first embodiment of the optical laminate the form in which the polarizing film is bonded on both surfaces of the glass cell for liquid crystal display through the adhesive layers having different gel fractions may be hereinafter referred to as “first embodiment of the optical laminate”.
- a polarizing film composed of an amorphous cyclic polyolefin resin film, a Z polarizer, and a protective Z film is formed on both sides of a glass cell for liquid crystal display.
- a polarizing film composed of an amorphous cyclic polyolefin-based resin film polarizer protective film is provided on both surfaces of a glass cell for liquid crystal display via an adhesive layer having a high gel fraction.
- the form of bonding on the crystalline cyclic polyolefin-based resin film side may be hereinafter referred to as “second embodiment of optical laminate”.
- the optical laminate 30 according to the present invention is provided on the one surface of the liquid crystal display glass cell 35 via the first adhesive layer 11.
- One polarizing film 15 is attached, and the second polarizing film 25 is attached to the other surface of the glass cell 35 via the second adhesive film 21.
- the first polarizing film 15 is composed of an amorphous cyclic polyolefin resin film 1 2 no polarizer 1 3 Z protective film 14, and the first adhesive layer 1 1 has a gel fraction of 7
- the first polarizing film 15 is composed of 5 to 95% by weight, and the first polarizing film 15 is on the amorphous cyclic polyolefin-based resin film 12 side. Affixed to one side of Le 35.
- the first polarizing film 15 and the second polarizing film 25 is the front side (viewing side) and which is the back side (backlight side).
- the first polarizing film 15 having the amorphous cyclic polyolefin resin film 12 is preferably on the back side.
- a brightness enhancement film 17 similar to that described above with reference to FIG. 2 can be laminated on the outer side of the protective film 14 in the first polarizing film 15 on the back side. .
- the polarizing film with adhesive 10 placed on one side (lower side of the figure) of the cell glass for liquid crystal display 35 is the same as that shown in FIG. 1, and in FIG. Liquid crystal display cell glass 3 With adhesive placed on one side (bottom side of figure) Since the polarizing film 10 is the same as that shown in FIG. 2, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the liquid crystal display glass cell 35 includes a glass substrate, and a liquid crystal display device in which a liquid crystal compound is filled between two glass substrates is usually used.
- the liquid crystal display mode in the glass cell for liquid crystal display 35 is not only TN and STN, but also IPS-(In-Plane Switching), VA (Vertical Alignment), OCB (Optical ly Co immediate ensated Birefringence), etc.
- IPS-(In-Plane Switching) VA (Vertical Alignment)
- OCB Optical ly Co immediate ensated Birefringence
- materials known in this field can be used.
- the material for the glass substrate include soda lime glass, low alkali glass, and non-alloy glass.
- the surface treatment layer 27 provided on the outer side of the second polarizing film 25 as necessary can reflect the light emitted from an external light source such as a fluorescent lamp in order to enhance display characteristics and surface properties. This is to reduce the visibility of the liquid crystal display device.
- an external light source such as a fluorescent lamp
- the anti-glare (AG) layer that scatters the reflected light by making the surface uneven the anti-reflection (AR) layer that uses light interference, and the low reflection (LR) layer that reduces the reflectance by the coating film And so on.
- AG anti-glare
- AR anti-reflection
- LR low reflection
- the eight coat layer can also be the surface treatment layer 27.
- the first polarizing film 15 and the second polarizing film 25 are usually arranged so that their respective transmission axes form a predetermined angle, for example, to be orthogonal in the TN mode, IPS mode, and VA mode. It is bonded to both surfaces of the glass cell for liquid crystal display 35 through the adhesive layer.
- the second adhesive layer 21 used for bonding the second polarizing film 25 and the liquid crystal display glass cell 35 is the same as the first adhesive layer 11 described above with reference to FIG. It can be obtained by curing a pressure-sensitive adhesive obtained by blending a crosslinking agent with an acrylic resin.
- a pressure-sensitive adhesive obtained by blending a crosslinking agent with an acrylic resin.
- acrylic resins and cross-linking agents the same explanation as for the first pressure-sensitive adhesive applies.
- the first embodiment of the optical layered body will be described mainly with reference to FIG. 3 and with reference to FIG. 4 as necessary.
- the first polarizing film 15 consisting of the amorphous cyclic polyolefin resin film 1 2 polariser 1 3 / protective film 1 4 is replaced with the amorphous cyclic polyolefin resin film 1 2 side.
- the first adhesive layer 11 having a gel fraction of 75 to 95% by weight is attached to one side of the glass cell 3 5 for liquid crystal display, and the glass cell for liquid crystal display 3 5
- the second polarizing film 25 with the acetylyl cellulose-based protective films 21 and 23 bonded to both sides of the polarizer 23 is pasted via the second adhesive layer 21.
- the second pressure-sensitive adhesive layer 21 is preferably made to have a gel fraction of 30 to 70% by weight.
- the first polarizing film 15 and the second polarizing film 25 is the front side (viewing side) and which is the back side (backlight side).
- the second polarizing film 25 having a structure in which the acetylyl cellulose-based protective films 2 2 and 24 are bonded to both surfaces of the polarizer 23 is the front side.
- a brightness enhancement film 17 similar to that described above with reference to FIG. 2 can be laminated on the outer side of the protective film 14 in the first polarizing film 15 on the back side. .
- a polarizing film is an optical film having a function of emitting polarized light with respect to incident light such as natural light.
- the polarizing film absorbs linearly polarized light having a vibration plane in a certain direction and transmits linearly polarized light having a vibration plane orthogonal to the polarizing film, and an elliptical film in which a retardation film is laminated on the linear polarizing film.
- a film containing a linear polarizing film is preferably used as the second polarizing film 25.
- polarizer 2 3 constituting the second polarizing film 25 a uniaxially stretched polyvinyl alcohol-based resin film, like the polarizer 1 3 constituting the first polarizing film 15, is used.
- polarizers in which a dichroic dye such as iodine or a dichroic dye is adsorbed and oriented.
- This polarizer 2 3 has acetyl cellulose-based protective films 2 2 and 24 bonded on both sides.
- Specific examples of the acetyl cellulose-based protective film include a triacetyl cellulose film and a diacetyl cellulose film. Among them, a triacetyl cellulose film is preferably used.
- the thickness of the protective films 2 2 and 24 is usually about 30 to 120 m.
- the second adhesive layer 21 has a gel fraction of 30 to 70% by weight, more preferably 40% by weight or more, and 65% by weight or less. It is preferable to do this.
- the gel fraction can be measured by the same method as described for the first adhesive. If the gel fraction of the second adhesive layer 2 1 is 30% by weight or more, adhesion at high temperature and high humidity is improved, and floating or peeling may occur between the glass substrate and the adhesive layer. This is preferable since the reworkability tends to be improved.
- the gel fraction is 70% by weight or less, even if the dimension of the second polarizing film 25 bonded to the adhesive layer changes, the adhesive layer follows the dimensional change. Therefore, there is no difference between the brightness at the periphery of the liquid crystal cell and the brightness at the center, which is preferable because white spots and color unevenness tend to be suppressed.
- the gel fraction of the second adhesive layer 21 can also be adjusted by adjusting the blending amount of the crosslinking agent in the adhesive.
- the amount of crosslinking agent that can bring the gel fraction of the second adhesive layer 21 to 30 to 70% by weight varies depending on the type of acrylic resin, etc., so the acrylic resin constituting the second adhesive layer 21
- the amount of cross-linking agent to 100 parts by weight of the non-volatile content is appropriately selected from the range of about 0.1 to 3 parts by weight according to the type of acrylic resin. That's fine.
- the gel fraction of the first adhesive layer 11 is at least 5% by weight greater than the gel fraction of the second adhesive layer 21.
- the difference between the two be 10% by weight or more, and further 15% by weight or more.
- the structural unit derived from the (meth) acrylic acid alkyl ester described as the acrylic resin is mainly used as the acrylic resin.
- an acrylic resin containing a structural unit derived from a monomer having a polar functional group as a component particularly an acrylic resin having a weight average molecular weight (Mw) of 1,000,000 to 2,000,000 (first acrylic resin)
- the second acrylic resin is mainly composed of structural units derived from (meth) acrylic acid alkyl ester, and the weight average molecular weight (Mw) in terms of standard polystyrene by GPC is usually 50,000 to 500,000. It is preferable to be in the range.
- the weight average molecular weight is 50,000 or more, the adhesiveness under high temperature and high humidity is improved, and the possibility of occurrence of floating or peeling between the glass substrate and the adhesive layer tends to be reduced. In addition, it is preferable because reworkability tends to improve.
- the weight average molecular weight is 500,000 or less, the size of the second polarizing film 25 bonded to the adhesive layer changes. However, since the adhesive layer fluctuates following the dimensional change, there is no difference between the brightness of the periphery of the liquid crystal cell and the brightness of the center, and there is a tendency that white spots and color unevenness are suppressed. To preferred.
- the second acrylic resin is usually 5 to 50 parts by weight based on a total of 100 parts by weight of both, and further 20 It is preferable that the ratio be about ⁇ 40 parts by weight. If the amount of the second acrylic resin relative to 100 parts by weight of the entire acrylic resin is 5 parts by weight or more, even if the dimension of the second polarizing film 25 bonded to the adhesive layer changes, Since the adhesive layer fluctuates following the dimensional change, there is no difference between the brightness at the periphery of the liquid crystal cell and the brightness at the center, and this is preferred because white spots and color unevenness tend to be suppressed.
- the amount of the second acrylic resin is 50 parts by weight or less, adhesion at high temperature and high humidity is improved, and there is a possibility that floating or peeling occurs between the glass substrate and the adhesive layer. Is preferable because the reworkability tends to be improved.
- the thickness of the second adhesive layer 21 is not particularly limited, but is usually 30 fi m or less. 3 ⁇ 2 is preferable and 1 or more is preferable. If the thickness of the adhesive layer is 30 m or less, the adhesiveness at high temperature and high humidity will improve, and the possibility of floating or peeling between the glass substrate and the adhesive layer will tend to decrease. In addition, it is preferable because it has a tendency to improve reworkability.
- the thickness of the second adhesive layer 21 is preferably 25 m or less and 15 m or more.
- the amorphous cyclic polyolefin resin film 1 2 Z polarizer 1 3 protective film 14 The first polarizing film 15 consisting of 4 is replaced with the amorphous cyclic polyolefin resin film 1 2 side.
- the glass cell for liquid crystal display 3 is laminated on one side of the glass cell for liquid crystal display 3 5 through the first adhesive layer 11 having a ⁇ 'le fraction of 75 to 95% by weight provided in 1
- the second polarizing film 25 having the structure of the amorphous cyclic polyolefin resin film 2 2 / polarizer 2 3 Z protective film 24 is also attached to the other surface of the amorphous cyclic polyolefin resin resin film 5. It laminates
- the second adhesive layer 21 also has the same description as that described for the adhesive layer 11 with reference to FIG.
- the front and back surfaces of the glass cell for liquid crystal display 35 are basically symmetrical structures, so either may be the front side (viewing side) and either may be the back side (backlight side).
- the second polarizing film 25 is the front side.
- a brightness enhancement film 17 can be laminated on the outer side of the protective film 14 in the first polarizing film 15 on the back surface side.
- the optical laminate shown in Fig. 3 has an amorphous cyclic polyolefin resin film 1 2 through a first adhesive layer 11 on one side of a glass cell 35 for liquid crystal display 1 2 No-polarizer 1 3 Z-protective film A first polarizing film 15 having the structure of 1 4 is adhered to the amorphous cyclic polyolefin resin film 1 2 side, and the second adhesive layer 2 is attached to the other surface of the glass cell for liquid crystal display 3 5. 1 can be produced by sticking the second polarizing film 25 through 1.
- the first pressure-sensitive adhesive layer 11 is prepared so that its gel fraction is 75 to 95% by weight, and the first polarizing film is prepared.
- 15 Amorphous cyclic polyolefin-based resin film 1 2 Provided on the surface, the second adhesive layer 2 1 is prepared so that its gel fraction is 30 to 70% by weight.
- a method is adopted in which the first polarizing film 15 and the second polarizing film 25 are attached to both sides of the glass cell for liquid crystal display 35 via the respective adhesive layers. it can. As shown in Fig.
- the optical laminate of the first embodiment can be produced by the following method.
- the first polarizing film having a structure of an amorphous cyclic polyolefin resin film 1 2 Z polarizer 1 3 / protective film 14 1 5 (If necessary, a brightness enhancement film 1 7 is provided outside the protective film 1 4)
- Amorphous cyclic polyolefin resin film 1 2 A polarizing film with an adhesive 10 is produced.
- the surface of the one-side protective film 22 is also applied to the second polarizing film 25 (if the second polarizing film 25 has the surface treatment layer 27, the surface opposite to the surface treatment layer)
- the second pressure-sensitive adhesive layer 21 is formed by a method according to the above to produce a second pressure-sensitive adhesive-attached polarizing film 20.
- the first pressure-sensitive adhesive film 10 and the second pressure-sensitive adhesive polarizing film 20 are bonded to each surface of the liquid crystal display glass cell 35 on the respective adhesive layer side.
- the first adhesive layer 11 is formed on the release film by the method according to the above, and the second adhesive layer 21 is formed on another release film.
- the first adhesive layer 11 is transferred onto the amorphous cyclic polyolefin-based resin film 12 of the first polarizing film 15, and the second adhesive layer is transferred onto the second polarizing film 25.
- the release film is peeled off to obtain a laminate of the first adhesive layer 11 and the first polarizing film 15 and a laminate of the second adhesive layer 21 and the second polarizing film 25.
- the first adhesive layer 1 1 is bonded to one side of the glass cell for liquid crystal display 3 5 and the second adhesive layer 21 is bonded to the other side of the glass cell 3 5 for liquid crystal display, and then the surface treatment layer 2 7 Is laminated on the surface of the second polarizing film 25.
- a film on which the surface treatment layer 27 is formed is prepared, and this is bonded to the surface of the second polarizing film 25.
- the optical laminated body according to the second embodiment is composed of an amorphous cyclic polyolefin resin film 2 2 Z polarizer 2 3 protective film 2 4 as the second polarizing film 25.
- a gel fraction having a gel fraction of 75 to 95% by weight is employed, and the others can be produced by the same method as described above.
- the set of polarizing films according to the present invention includes the amorphous cyclic polyolefin-based resin film 1 2 / polarizer 1 3 Z protective film 1 4 described above as the first embodiment of the optical laminate with reference to FIG.
- a first polarizing film with a pressure-sensitive adhesive comprising: a first polarizing film having a structure 15; and a first pressure-sensitive adhesive layer 1 1 provided on the amorphous cyclic polyolefin-based resin film 12 side, and A second polarizing film 25 having a acetylcellulose-based protective film 22, 24 bonded on both sides of the polarizer 23, and a second adhesive layer 21 provided on one side thereof And a second polarizing film with pressure-sensitive adhesive 20.
- the first adhesive layer 11 has a gel fraction of 75 to 95% by weight
- the second adhesive layer 21 has a gel fraction of 30 to 70% by weight. ing.
- this set of polarizing films is composed of amorphous cyclic polyolefin resin film 1 2 / polarizer 1 3 protective film 1 4 first polarizing film 15 consisting of amorphous cyclic polyolefin system
- the first adhesive layer 1 1 is provided on the resin film 1 2 side to form a first polarizing film 10 with an adhesive.
- acetylcellulose-based protective films 2 2 and 2 4 are provided on both sides of the polarizer 2 2. It can be produced by a method in which a second pressure-sensitive adhesive layer is provided on one side of the second polarizing film 25 to which is attached to form a second polarizing film with pressure-sensitive adhesive 20. As shown in FIG.
- the amorphous cyclic polyolefin resin film 1 2 / polarizer 1 3 protective film 14 At the stage of the polarizing film 15, it is advantageous to attach a brightness enhancement film 17 to the outside of the protective film 14 via an adhesive or the like.
- Surface treatment layer on one side of 5 When 27 is provided, it is advantageous to produce the second polarizing film 25 in a state where the surface treatment layer 27 is provided on one surface of one protective film 24.
- the first adhesive layer 11 is prepared so that its gel fraction is 75 to 95% by weight, and the first polarizing film 15 is formed on the surface of the amorphous cyclic polyolefin-based resin film 12.
- the second adhesive layer 21 is prepared such that its gel fraction is 30 to 70% by weight, and one side of the second polarizing film 25 (second polarizing film 25) If it has a surface treatment layer 27, it is provided on the opposite side of the surface treatment layer.
- Each adhesive layer is provided by a method in which an adhesive solution is directly applied to the surface of the amorphous cyclic polyolefin resin film 12 of the first polarizing film 15 or one surface of the second polarizing film 25.
- a method of applying a solution of an adhesive on a release film and removing the solvent It is advantageous to form the pressure-sensitive adhesive layer by a method of transferring the adhesive layer to the surface of each polarizing film.
- the first adhesive layer 11 is prepared such that the gel fraction is 75 to 95% by weight, and an adhesive diluted with an organic solvent is applied onto the release film, With the organic solvent removed, it is bonded to the surface of the amorphous cyclic polyolefin resin film 12 of the first polarizing film 15.
- the second adhesive layer 2 1 has a gel fraction of 30 to
- a pressure-sensitive adhesive prepared to be 70% by weight and diluted with an organic solvent is applied onto the release film, and the organic solvent is removed and the adhesive is bonded to one side of the second polarizing film 25.
- the adhesive layer is aged for a sufficient period of time before or after being applied to the polarizing film, and is allowed to react with the crosslinking agent.
- the first polarizing film 15 comprising the structure of the amorphous cyclic polyolefin resin film 1 2 / polarizer 1 3 Z protective film 14 described as the second embodiment of the optical laminate, and its amorphous A first pressure-sensitive adhesive polarizing film having a first pressure-sensitive adhesive layer 1 1 provided on the side of the porous cyclic polyolefin resin film 1 2, and an amorphous cyclic polyolefin-based resin film 2 2 / polarizer 2 3 Z protective film 2 4
- the combination of the second polarizing film 25 having the configuration and the second polarizing film with adhesive 20 having the second adhesive layer 21 provided on one side thereof can be a set of another polarizing film.
- the two polarizing films with adhesives 10 and 20 have basically the same structure except when an additional layer such as a surface treatment layer or a brightness enhancement film is provided. No explanation will be necessary.
- the optical layered body of the present invention is advantageously used as a transmissive liquid crystal display device.
- a backlight is provided on the opposite side of the glass cell for liquid crystal display 35 of the brightness enhancement film 17 to provide a liquid crystal display device.
- the surface of the glass substrate that is in contact with the adhesive layer even after the polarizing film is peeled off Since the remainder and cloudiness hardly occur, it is easy to re-attach the polarizing film to the liquid crystal display glass cell after the polarizing film is peeled off. That is, it is excellent in so-called reworkability.
- the liquid crystal display device formed from this optical laminate includes, for example, a personal computer evening display including a notebook type, a desktop type, a PDA (Personal Digital Assistant), a television, an in-vehicle display, and an electronic dictionary. Can be used for digital camera, digital video camera, electronic desk calculator, clock, etc.
- the nonvolatile content of the acrylic resin is a value measured by a method according to ⁇ IS K 5407. Specifically, the adhesive solution was taken in a petri dish at an arbitrary weight, and the weight of the residual nonvolatile content after drying for 2 hours at 1 15 in an explosion-proof oven was expressed as a percentage of the weight of the solution first measured. Is.
- acrylic resin A1 had a polystyrene-reduced weight average molecular weight Mw of 1,540,000 and Mw / Mn of 4.69 according to GP C. This is called acrylic resin A1.
- An acrylic resin solution was obtained in the same manner as in Polymerization Example 1, except that the monomer composition was changed to 98.7 parts of butyl acrylate, 1.1 parts of acrylic acid, and 0.2 parts of 2-ethylhexyl acrylate.
- the obtained acrylic resin had a polystyrene-reduced weight average molecular weight Mw of 1,390,000 and Mw / Mn of 3.53 by GPC. This Krill resin A2.
- a reactor equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer was charged with a mixed solution of 81.8 parts of ethyl acetate, 98.9 parts of butyl acrylate and 1.1 parts of acrylic acid, and the air in the apparatus was filled with nitrogen gas. Was replaced with oxygen, and the internal temperature was raised to 55. Then, a total solution of 0.14 parts of azobisisoptyronitrile (polymerization initiator) dissolved in 10 parts of ethyl acetate was added. .
- acrylic resin A3 One hour after the addition of the initiator, while adding ethyl acetate continuously to the reactor at an addition rate of 1 7.3 parts hr so that the concentration of the acrylic resin excluding the monomer is 35%, the internal temperature is 54 to 56X: 12 The mixture was kept warm for a period of time, and finally ethyl acetate was added to adjust the acrylic resin concentration to 20%.
- the resulting acrylic resin had a polystyrene equivalent weight average molecular weight Mw by GPC of 1,200,000 and Mw / Mn of 3.9. This is referred to as acrylic resin A3.
- Coronate L Trimethylolpropane adduct of tolylene diisocyanate in ethyl acetate solution (solid content 75%), Nippon Polyurethane Industry Co., Ltd.
- TAZM Trimethylolpropane Tory
- Ichigo Liquid
- X-41-1805 Silane oligomer having a mercapto group (liquid), obtained from Shin-Etsu Chemical Co., Ltd.
- Acrylic resin A3 obtained in Polymerization Example 3 was mixed in a proportion of 70 parts as a non-volatile component, and acrylic resin A4 obtained in Polymerization Example 4 was mixed in a proportion of 30 parts as a non-volatile component to obtain an acrylic resin ethyl acetate solution.
- a polarizing film with an adhesive was prepared and applied to a glass substrate to produce an optical laminate.
- steps required until the optical laminated body 1 is obtained will be described.
- a first polarizing film comprising a norbornene-based resin film, a Z-polyvinyl alcohol-based polarizer and a cellulose cellulose protective film is attached to one side of a glass cell for liquid crystal display, and a triacetyl cellulose protective film is attached to the other surface.
- a second polarizing film which is a constitution of a Z polyvinyl alcohol-based polarizer Z triacetyl cellulose protective film, is attached is shown.
- Norbornene-based resin film Z Polyvinyl alcohol-based polarizer Triacetyl Prepare first polarizing film 15 that is a cellulose protective film, and output 6 0 0 W on the surface of the norbornene-based resin film 1 2, moving speed 1 After corona discharge treatment was performed under the conditions of O mZ, laminate was used on the corona discharge treatment surface, and the previously obtained sheet-like separator with adhesive overnight 1 (gel fraction 8 0.2%, film thickness of 15 m) on the adhesive side, temperature 23: relative humidity 65% The first pressure-sensitive adhesive layer 11 was formed on the surface of the norbornene-based resin film 12 of the first polarizing film 15 to obtain a first polarizing film 10 with a pressure-sensitive adhesive.
- a second polarizing film 25 having a configuration of a triacetyl cellulose protective film polyvinyl alcohol polarizer / triacetyl cellulose protective film, with an antireflection layer formed on the surface of one protective film, and its reflection
- a laminator on the surface of the protective film where the prevention layer is not provided
- the sheet-like separator with adhesive 3 obtained above gel fraction 6 1.8%, film thickness 25 m Bonded on the adhesive side, further aged for 10 days under the condition of temperature 23: relative humidity 65%, second polarizing film 25
- the pressure-sensitive adhesive layer 21 was formed, and a second polarizing film with pressure-sensitive adhesive 20 was obtained.
- the polarizing film with the first adhesive 10 is attached to the first adhesive layer 1 1 to the separator.
- the second polarizing film with pressure-sensitive adhesive 20 was peeled off from the pressure-sensitive adhesive layer 21 and bonded to the other surface of the glass substrate.
- the first polarizing film 15 and the second polarizing film 25 were attached so as to be crossed Nicols.
- An optical laminate 30 was produced in which the first polarizing film 15) having the configuration was sequentially laminated.
- Each of the two polarizing films has a square shape of 3 O cm ⁇ 22 cm (15 type).
- ⁇ ⁇ No change in appearance such as floating, peeling or foaming.
- ⁇ Almost no change in appearance such as floating, peeling, foaming, etc.
- test piece having a size of 25 mm ⁇ l 50 mm was cut. This test piece is attached to the application device [Fuji Plastic Paste it onto a glass cell substrate for liquid crystal display using “Lami Packer” (trade name)] manufactured by Koki Co., Ltd., and automate for 20 minutes at 50 T: 5 kg / cm2 (49.03 kPa) Claving was performed. Next, heat treatment was performed at 70 ° C for 2 hours, followed by storage in an oven at 50 for 48 hours, and then this bonding was performed in an atmosphere at a temperature of 23 tons and a relative humidity of 50%.
- Norpolene-based resin film Z Polyvinyl alcohol-based polarizer Z-Liacetyl
- a polarizing film with a pressure-sensitive adhesive was prepared in the same manner as in Example 1 except that the pressure-sensitive adhesive with a separator 2 (gel fraction: 82.9%, film thickness: 25 m) was prepared, and an optical laminate was further prepared. .
- This optical laminate was evaluated in the same manner as (c) in Example 1, and the results are shown in Table 2.
- the polarizing film with the adhesive obtained by applying the adhesive 2 with a separator to the first surface of the first polarizing film 15 produced on the first polarizing film 15 is the same as (d) of Example 1. Then, when the reworkability was evaluated, no adhesive residue was observed on the surface of the glass plate, and good reworkability was exhibited with almost no clouding.
- the first polarizing film 1 5 norbornene-based resin film 1 2 The adhesive to be bonded to the surface and the second polarizing film 25 to the protective film surface on the side where the antireflection layer is not provided All were the same as in Example 1 except that the pressure-sensitive adhesive 1 (gel fraction 80.2%, film thickness 15 m) shown in the pressure-sensitive adhesive production example was used. An optical laminate was prepared and evaluated. The results are also shown in Table 2.
- Adhesive 3 shown in the production example of the adhesive 3 (gel fraction 6 1.8%, film thickness 25 im)
- the pressure-sensitive adhesive to be bonded to the surface of the protective film on the side of the second polarizing film 25 on which the antireflection layer is not provided is the pressure-sensitive adhesive 1 shown in the pressure-sensitive adhesive production example (gel fraction 80.2).
- An optical laminate was prepared and evaluated in the same manner as in Example 1 except that the film thickness was set to 1. The results are also shown in Table 2.
- Adhesive 1 Adhesive 3 ⁇ ⁇ ⁇ ⁇ ⁇
- the first adhesive layer provided on the amorphous cyclic polyolefin resin film side of the first polarizing film having the amorphous cyclic polyolefin resin film has a gel fraction of Therefore, in Examples 1 to 3 composed of the adhesive 1 or the adhesive 2 having a high cohesive force, the adhesive force is increased because the adhesive layer is adhered to the amorphous cyclic polyolefin resin film. High durability was shown.
- the second adhesive layer provided on the cellulose-based protective film side of a normal polarizing film (second polarizing film) having a cellulose-based protective film is a pressure-sensitive adhesive having a low gel fraction and thus a low cohesive force.
- Example 3 since the stress between the glass surface and the second adhesive layer side can be relaxed, white spots could be suppressed.
- the adhesive layer 3 having a low cohesive force is used in the optical laminate of Comparative Example 1 in which both of the adhesive layers are composed of the adhesive 3 having a low gel fraction and thus a low cohesive force. Therefore, good results were obtained in white spots, but the durability was inferior.
- Comparative Example 2 using a low gel fraction adhesive 3 on the first polarizing film side and a high gel fraction adhesive 1 on the second polarizing film side, the first polarizing film side Due to the low cohesive pressure-sensitive adhesive 3 used, the durability was inferior.
- a polarizing film having a configuration of a norbornene-based resin film / polyvinyl alcohol-based polarizer notriacetyl cellulose protective film is attached to both surfaces of a glass cell for liquid crystal display.
- a second polarizing film 25 having a composition of a norpolene-based resin film polyvinyl alcohol-based polarizer triacetyl cellulose protective film and having an antireflection layer formed on the surface of the triacetyl cellulose protective film is prepared.
- the previous adhesive Adhesive 1 with gel separator (gel fraction 80.2%, film thickness 15 u rn) shown in the preparation example of the adhesive was pasted on the adhesive side, and the temperature 2 3, relative humidity 6 Aged for 10 days under the condition of 5% to form a second adhesive layer 21 on the two-sided norbornene-based protective film 2 2 side of the second polarizing film 25, and polarized light with the second adhesive Film 20 was designated.
- the polarizing film with the first adhesive 10 is attached to the first adhesive layer 1 1 to the separator.
- the second polarizing film with pressure-sensitive adhesive 20 was bonded to the other surface of the glass substrate with the separator removed from the pressure-sensitive adhesive layer 21.
- the first polarizing film 15 and the second polarizing film 25 should be crossed Nicols. Stuck on.
- the antireflection layer (protective film 24, polarizer 23, norpolarene resin film 22, second polarizing film 25) / second adhesive layer 21Z glass substrate 35, first adhesive layer 1 1Z (norpornene) Resin film 1 2Z polarizer 13
- the optical laminated body 30 in which the first polarizing film 15), which is the structure of the protective film 14, was sequentially laminated was produced.
- Each of the two polarizing films was a 3 Ocm ⁇ 22 cm (15 type) square.
- Adhesives to be bonded to the surfaces of the norbornene-based resin films 12 and 22 of the first polarizing film 15 and the second polarizing film 25 are the adhesives with a sheet-like separator shown in the previous adhesive production example 4
- a polarizing film with an adhesive was produced in the same manner as in Example 4 except that the gel fraction was changed to 75.5% and the film thickness was 15 III. Further, an optical laminate was produced. The optical laminate was evaluated in the same manner as (c) of Example 4, and the results are also shown in Table 3. '
- the pressure-sensitive adhesive to be bonded to the surface of the second polarizing film 25 is the pressure-sensitive adhesive with a sheet-like separator 3 shown in the previous pressure-sensitive adhesive production example 3 (gel fraction 61.8%, film thickness A polarizing film with an adhesive was prepared in the same manner as in Example 4 except that the thickness was changed to 25 ⁇ m), and an optical laminate was further prepared. This optical laminate was evaluated in the same manner as in Example 4 (c), and the results are also shown in Table 3. Also, the reworkability of the newly prepared polarizing film with adhesive was evaluated in the same manner as in Example 4 (d). As a result, good reworkability was exhibited with no adhesive residue on the glass plate surface and almost no clouding.
- the pressure-sensitive adhesive to be bonded to the surface of the first polarizing film 15 and the norbornene-based resin film 12 is the pressure-sensitive adhesive 3 with a sheet-shaped separator shown in the previous pressure-sensitive adhesive production example 3 (gel fraction 61.8%, A polarizing film with an adhesive was produced in the same manner as in Example 4 except that the film thickness was changed to 25 rn), and an optical laminate was further produced. This optical laminate was evaluated in the same manner as in Example 4 (c), and the results are also shown in Table 3. Also, the reworkability of the newly prepared polarizing film with adhesive was evaluated in the same manner as in Example 4 (d). As a result, good reworkability was exhibited with no adhesive residue on the glass plate surface and almost no clouding.
- Adhesives to be bonded to the surfaces of the first polarizing film 15 and the second polarizing film 25 respectively of the norbornene-based resin films 12 and 22 are the same sheet-like separators with adhesive as used in Comparative Examples 3 and 4, respectively.
- Adhesive 4 Adhesive 4 ⁇ ⁇ ⁇ ⁇ Comparative Example 3
- Adhesive 1 Adhesive 3 ⁇ X X X
- the optical laminated body to which the polarizing film with a pressure-sensitive adhesive or the set of polarizing films of the present invention is applied can be suitably used for a liquid crystal display device because it has few white spots even when it is enlarged and has excellent durability.
- it is suitable for an optical laminate such as a liquid crystal cell.
- this optical laminate is used in an STN liquid crystal cell, the occurrence of color unevenness can be suppressed.
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Abstract
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Priority Applications (2)
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US12/302,153 US20090142517A1 (en) | 2006-05-26 | 2007-05-24 | Polarizing film with adhesive, optical laminate, and set of polarizing films |
KR1020087031483A KR101409615B1 (ko) | 2006-05-26 | 2007-05-24 | 점착제가 형성된 편광 필름, 광학 적층체 및 편광 필름의 세트 |
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KR (1) | KR101409615B1 (ja) |
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CN102721992B (zh) * | 2006-09-13 | 2015-09-23 | 住友化学株式会社 | 涂布有粘合剂的光学膜 |
US20100026939A1 (en) * | 2006-12-20 | 2010-02-04 | Sumitomo Chemical Company, Limited | Polarizer and liquid crystal display device |
JP5194486B2 (ja) * | 2007-02-28 | 2013-05-08 | 住友化学株式会社 | 液晶表示装置 |
JP5305997B2 (ja) * | 2008-12-03 | 2013-10-02 | 日東電工株式会社 | 耐水性偏光フィルム、及びその製造方法、及び画像表示装置 |
DE102009031421A1 (de) * | 2009-07-01 | 2011-01-05 | Tesa Se | Verwendung von Haftklebebändern |
KR101707424B1 (ko) * | 2009-09-10 | 2017-02-16 | 스미또모 가가꾸 가부시키가이샤 | 필름의 접착성 평가 방법 및 적층체의 제조 방법 |
TWI432838B (zh) * | 2011-02-25 | 2014-04-01 | Innolux Corp | 顯示器及其製造方法 |
US20120275024A1 (en) * | 2011-04-27 | 2012-11-01 | Rockwell Collins, Inc. | Polarizer assembly with adhesive layers |
KR101397697B1 (ko) | 2011-12-01 | 2014-05-22 | 제일모직주식회사 | 광학 점착제, 이를 포함하는 광학 부재 및 이를 포함하는 화상 표시 장치 |
US9562178B2 (en) | 2013-10-31 | 2017-02-07 | Lg Chem, Ltd. | Polyvinylalcohol based resin adhesive for polarizing plate, polarizing plate including same, and an image display device |
WO2015064920A1 (ko) * | 2013-10-31 | 2015-05-07 | 주식회사 엘지화학 | 편광판용 폴리비닐알코올계 수지 접착제, 이를 포함하는 편광판 및 화상표시장치 |
JP5871408B1 (ja) * | 2014-09-19 | 2016-03-01 | 日東電工株式会社 | 偏光板および光学積層体 |
JP7155287B2 (ja) * | 2018-12-14 | 2022-10-18 | 富士フイルム株式会社 | 植物育成用灯具 |
WO2020203124A1 (ja) * | 2019-03-29 | 2020-10-08 | 日東電工株式会社 | ガラス樹脂積層体の製造方法 |
CN210881886U (zh) * | 2019-08-30 | 2020-06-30 | 广东远峰汽车电子有限公司 | 车辆后视镜及具有该车辆后视镜的车辆 |
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JP2002277634A (ja) * | 2001-03-16 | 2002-09-25 | Nitto Denko Corp | 粘着型光学フィルム及び光学フィルム用粘着剤 |
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JP2003262729A (ja) * | 2002-03-11 | 2003-09-19 | Nitto Denko Corp | 粘着型光学フィルムおよび画像表示装置 |
TW200535517A (en) * | 2003-12-26 | 2005-11-01 | Zeon Corp | Polarizing plate protective film, polarizing plate with reflection preventing function and optical product |
JP5269282B2 (ja) * | 2004-08-11 | 2013-08-21 | 住友化学株式会社 | 粘着剤 |
TWI380900B (zh) * | 2004-09-17 | 2013-01-01 | Sumitomo Chemical Co | 光學疊層體 |
TW200632002A (en) * | 2004-11-30 | 2006-09-16 | Fuji Photo Film Co Ltd | Polarizing plate and liquid crystal display device comprising the same |
TWI400312B (zh) * | 2005-04-14 | 2013-07-01 | Sumitomo Chemical Co | 黏著劑 |
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2007
- 2007-05-24 TW TW96118559A patent/TWI416177B/zh active
- 2007-05-24 US US12/302,153 patent/US20090142517A1/en not_active Abandoned
- 2007-05-24 KR KR1020087031483A patent/KR101409615B1/ko active IP Right Grant
- 2007-05-24 CN CNA200780027030XA patent/CN101490587A/zh active Pending
- 2007-05-24 WO PCT/JP2007/061043 patent/WO2007139174A1/ja active Application Filing
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JP2002277634A (ja) * | 2001-03-16 | 2002-09-25 | Nitto Denko Corp | 粘着型光学フィルム及び光学フィルム用粘着剤 |
JP2003329832A (ja) * | 2002-05-13 | 2003-11-19 | Nitto Denko Corp | 粘着型光学フィルム、光学フィルム用粘着剤組成物および画像表示装置 |
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