KR20150112477A - Process for Preparing Polarizing Plate - Google Patents

Process for Preparing Polarizing Plate Download PDF

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Publication number
KR20150112477A
KR20150112477A KR1020140036752A KR20140036752A KR20150112477A KR 20150112477 A KR20150112477 A KR 20150112477A KR 1020140036752 A KR1020140036752 A KR 1020140036752A KR 20140036752 A KR20140036752 A KR 20140036752A KR 20150112477 A KR20150112477 A KR 20150112477A
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KR
South Korea
Prior art keywords
protective film
polarizing plate
polarizer
film
polarizer protective
Prior art date
Application number
KR1020140036752A
Other languages
Korean (ko)
Inventor
이제혁
이원범
Original Assignee
동우 화인켐 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 동우 화인켐 주식회사 filed Critical 동우 화인켐 주식회사
Priority to KR1020140036752A priority Critical patent/KR20150112477A/en
Publication of KR20150112477A publication Critical patent/KR20150112477A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C08L23/0823—Copolymers of ethene with aliphatic cyclic olefins
    • 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
    • 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
    • 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
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Polarising Elements (AREA)

Abstract

The present invention relates to a manufacturing method of a polarizing plate which has excellent crack resistance by controlling tension applied to a polarizer protection film when joining the polarizer and the polarizer protection film. The manufacturing method allows pre-testing with respect to the crack resistance in a review step of the polarizer protection film before using the polarizer protection film for manufacturing a polarizing plate, therefore, the tension conditions for polarizing plate manufacturing can be easily determined, which facilitates in the manufacturing of the polarizing plate having excellent crack resistance.

Description

[0001] The present invention relates to a process for preparing a polarizing plate,

The present invention relates to a method for manufacturing a polarizing plate having excellent crack resistance by controlling a tension condition added to a polarizer protective film when a polarizer and a polarizer protective film are bonded.

BACKGROUND ART Polarizers used in various image display devices including liquid crystal display devices (LCDs) are usually produced by coating a polyvinyl alcohol (PVA) -based film with at least one polarizing agent on which dichroic dye is adsorbed, And has a structure in which a polarizer protective film typified by cellulose triacetylcellulose (TAC) film is laminated.

In recent years, a retardation film is further used to compensate for the viewing angle, and a cyclic olefin-based film is mainly used as a retardation film. The retardation film generally serves not only as a viewing angle compensation but also as a protective film.

However, a protective film such as a cyclic olefin-based film is vulnerable to a solvent used in a panel joining process, and there is a high possibility that cracks are generated on a polarizing plate during a panel joining process.

However, the solvent resistance evaluation method disclosed in Korean Patent Laid-Open Publication No. 2013-0097229 confirms the state of the film before and after the addition of the solvent, and it is difficult to verify the possibility of cracking after the polarizing plate is formed.

Korean Patent Publication No. 2013-0097229

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method of manufacturing a polarizing plate having excellent crack resistance by adjusting a tension condition added to a polarizer protective film when a polarizer and a polarizer protective film are bonded .

Another object of the present invention is to provide a polarizing plate produced by the above production method.

It is still another object of the present invention to provide a liquid crystal display device including the polarizing plate.

Meanwhile, the present invention provides a method for producing a polarizing plate having excellent crack resistance by controlling a tension condition added to a polarizer protective film when a polarizer and a polarizer protective film are bonded.

In one embodiment of the present invention, the present invention relates to a method for producing a polarizing plate by evaluating the occurrence of a crack on the surface of a protective film by a solvent added onto the polarizing plate protective film while adjusting a tension condition added to the polarizing plate protecting film before the polarizing plate making process, And a tension condition in the polarizing plate forming step is set by predicting whether or not a crack will occur later.

On the other hand, the present invention provides a polarizing plate produced by the above method.

On the other hand, the present invention provides a liquid crystal display device including the polarizing plate.

According to the production method of the present invention, it is possible to pre-verify the crack resistance according to the tension condition during the examination of the polarizer protective film before the polarizing plate process, so that the tension condition during the polarizing plate process can be easily grasped, This excellent polarizing plate can be easily and easily manufactured.

Hereinafter, the present invention will be described in more detail.

An embodiment of the present invention relates to a method of manufacturing a polarizing plate having excellent crack resistance by adjusting a tension condition added to a polarizer protective film when a polarizer and a polarizer protective film are bonded.

According to one embodiment of the present invention, it is possible to evaluate whether cracks are generated on the surface of the protective film by the solvent added onto the polarizer protective film while adjusting the tension condition added to the polarizer protective film before the polarizing plate process, It is possible to produce a polarizing plate excellent in crack resistance by setting the tension condition in the polarizing plate process.

That is, according to one embodiment of the present invention, since it is possible to examine the range of stress that can remain in the protective film after the polarization plate formation, it is possible to pre-verify the crack resistance at the examination step of the polarizer protective film before the polarizing plate process Do.

In one embodiment of the present invention, the polarizer is a polymer film comprising a hydrophilic polymer film such as a vinyl alcohol-based film, a partially-formalized polyvinyl alcohol-based film, or an ethylene / vinyl acetate copolymer partially saponified film, And a film prepared by uniaxially stretching the film; And polyene oriented films such as dehydrated polyvinyl alcohol films or dechlorinated polyvinyl chloride films. Among them, a polarizer produced by adsorbing a dichroic substance such as iodine on a polyvinyl alcohol-based film and uniaxially stretching the film is particularly preferable in view of high polarization dichroism. The thickness of the polarizer is not particularly limited, but is generally about 5 to 80 탆.

The polarizer produced by adsorbing iodine onto a polyvinyl alcohol film and uniaxially stretching the film is obtained by, for example, immersing a polyvinyl alcohol-based film in an iodine aqueous solution for coloring, And then stretching it to a multiple of the length. The aqueous solution may contain boric acid, zinc sulfate, zinc chloride or the like as needed, or the polyvinyl alcohol-based film may be immersed in an aqueous solution of potassium iodide or the like. Further, the polyvinyl alcohol-based film may be immersed in water and washed with water before coloring, if necessary. The water washing of the polyvinyl alcohol film not only removes contaminants on the surface of the film or cleans the antiblocking agent, but also swells the polyvinyl alcohol film to prevent nonuniformity such as uneven coloring. The stretching of the film may be carried out after coloring the film with iodine, during the coloring of the film, or before coloring the film with iodine. The stretching may be carried out in an aqueous solution of boric acid or potassium iodide, or in a water bath.

In one embodiment of the present invention, any appropriate protective film can be used for the polarizer protective film as long as it can protect the polarizer without interfering with the effect of the present invention.

As the material of the polarizer protective film, acrylic type, cellulose type, polyolefin type, cyclic olefin type, polyester type or polycarbonate type can be used specifically.

Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate and polybutylene terephthalate; Cellulose-based resins such as diacetyl cellulose and triacetyl cellulose; Polyolefin-based resins such as polyethylene, polypropylene, cyclo-based or norbornene-based polyolefin, and ethylene-propylene copolymer; Polycarbonate resin, and the like.

The polarizer protective film may be an unoriented, uniaxially or biaxially stretched film, and the thickness thereof is usually 10 to 200 占 퐉, preferably 10 to 150 占 퐉. Further, when the polarizer protective film is laminated on both sides of the polarizer, the same or different thickness can be maintained.

In one embodiment of the present invention, when the polarizer protective film is an unoriented cycloolefin-based film, the polarizing plate having excellent crack resistance can be produced by adjusting the tension condition to 1.3 MPa or less.

In another embodiment of the present invention, when the polarizer protective film is a uniaxially stretched cyclic olefin-based film, the polarizing plate having excellent crack resistance can be produced by adjusting the tension condition to 2.3 MPa or less.

In another embodiment of the present invention, when the polarizer protective film is a biaxially stretched cyclic olefin-based film, the polarizing plate having excellent crack resistance can be produced by adjusting the tension condition to 3.3 MPa or less.

In one embodiment of the present invention, the polarizer and the polarizer protective film can be bonded using an adhesive.

Any suitable adhesive may be used as the adhesive, and a material excellent in transparency, thermal stability, and low birefringence is preferable. Specific examples include aqueous adhesives, thermoplastic adhesives, hot-melt adhesives, rubber adhesives, thermosetting adhesives, monomer reactive adhesives, inorganic adhesives, and natural adhesives. A preferred example is a monomer-responsive adhesive "Takenate 631" (trade name, manufactured by Mitsui Takeda Chemicals) containing an aliphatic isocyanate as a main component from the viewpoint of excellent optical transparency, weather resistance, and heat resistance; And an aqueous adhesive "GOHSEFIMER Z series" (trade name, manufactured by Nippon Synthetic Chemical Industry) containing a modified polyvinyl alcohol having an acetoacetyl group as a main component.

The thickness of the adhesive layer may be appropriately determined depending on the type of the resin serving as the adhesive, the adhesive strength, the environment in which the adhesive is used, and the like. The adhesive layer preferably has a thickness of 0.01 占 퐉 to 50 占 퐉, more preferably 0.05 占 퐉 to 20 占 퐉, still more preferably 0.1 占 퐉 to 10 占 퐉.

The bonding method may be a conventional method in the art. For example, a bonding method of a polarizer or a protective film, such as a flexible film, a Meyer bar coating method, a gravure coating method, a die coating method, a dip coating method, A method in which an adhesive composition is applied to the surface of a substrate and then these are bonded. The flexographic method is a method in which the polarizer or the protective film is moved in the vertical direction, the horizontal direction, or the inclined direction between the two, while applying the adhesive composition to the joint surface. After the adhesive composition is applied, the polarizer or the protective film is put on the nip roll or the like and bonded.

After the bonding, the drying treatment can be carried out. The drying treatment is carried out, for example, by spraying hot air. The drying temperature is suitably selected in the range of 40 to 100 占 폚, preferably 60 to 100 占 폚. The drying time may be about 20 to 1,200 seconds. After drying, it is preferable to cure at a room temperature or a slightly higher temperature, for example, at a temperature of 20 to 50 DEG C for about 12 to 600 hours.

A surface treatment layer such as a hard coating layer, an antireflection layer, an antiglare layer, and an antistatic layer may be further laminated on the other side of the polarizer to which the polarizer protective film is bonded on one side.

One embodiment of the present invention relates to a polarizing plate produced by the above-described manufacturing method.

The polarizing plate according to the present invention can be applied to all liquid crystal display devices. Therefore, one embodiment of the present invention relates to a liquid crystal display device including the polarizing plate.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that the following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.

Examples 1 to 9: Evaluation of crack occurrence in protective film and polarizer

3 ml of hexane was added to the protective film in a state where the tensile force shown in Table 1 was applied to a cyclic olefin (COP) polarizer protective film (25 mm width) of the following Table 1 using a UTM Autograph, The surface state of the film was confirmed.

Further, a polarizing plate was produced using a polarizer protective film to which tensile strength under the same conditions was added, and hexane was similarly added thereto to confirm whether or not a polarizing plate crack occurred.

Protective film tension menstruum Surface condition
(Whether crack occurred) Polarizer
(Whether crack occurred) Example 1 Biaxially oriented COP 0.5 MPa n-Hexane Not occurring Not occurring Example 2 Biaxially oriented COP 2.8 MPa n-Hexane Not occurring Not occurring Example 3 Biaxially oriented COP 3.8 MPa n-Hexane Occur Occur Example 4 Uniaxially stretched COP 0.5 MPa n-Hexane Not occurring Not occurring Example 5 Uniaxially stretched COP 2.0 MPa n-Hexane Not occurring Not occurring Example 6 Uniaxially stretched COP 2.8 MPa n-Hexane Occur Occur Example 7 Unreleased COP 0.5 MPa n-Hexane Not occurring Not occurring Example 8 Unreleased COP 1.0 MPa n-Hexane Not occurring Not occurring Example 9 Unreleased COP 1.5 MPa n-Hexane Occur Occur

As shown in Table 1, cracks were generated in the protective film at 3.8 MPa in the biaxially stretched cyclic olefin-based film, cracks occurred in the uniaxially stretched cyclic olefin-based film at 2.8 MPa, and the unstretched cycloolefin- Cracks occurred in MPa, and this tendency was confirmed to be the same also in the polarizing plate. Therefore, it is possible to manufacture a polarizing plate excellent in crack resistance by performing preliminary verification of crack resistance at the examination stage of the polarizer protective film before the polarizing plate making process and setting the tension condition in the polarizing plate making process.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Do. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Accordingly, the actual scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

A method for producing a polarizing plate excellent in crack resistance by controlling a tension condition added to a polarizer protective film when a polarizer and a polarizer protective film are bonded. The method according to any one of claims 1 to 3, wherein cracks on the surface of the protective film caused by the solvent added onto the polarizer protective film are evaluated while controlling the tension conditions added to the polarizer protective film before the polarizer- And setting a tension condition in the polarizing plate forming process. The method according to claim 1, wherein the polarizer protective film is an unoriented cycloolefin-based film, and the tension condition is adjusted to 1.3 MPa or less. The method according to claim 1, wherein the polarizer protective film is a uniaxially stretched cyclic olefin-based film, and the tension condition is adjusted to 2.3 MPa or less. The method according to claim 1, wherein the polarizer protective film is a biaxially stretched cyclic olefin-based film, and the tension condition is adjusted to 3.3 MPa or less. A polarizer produced by the method according to any one of claims 1 to 5. A liquid crystal display device comprising the polarizing plate according to claim 6.
KR1020140036752A 2014-03-28 2014-03-28 Process for Preparing Polarizing Plate KR20150112477A (en)

Priority Applications (1)

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KR1020140036752A KR20150112477A (en) 2014-03-28 2014-03-28 Process for Preparing Polarizing Plate

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KR1020140036752A KR20150112477A (en) 2014-03-28 2014-03-28 Process for Preparing Polarizing Plate

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