KR102024733B1 - Method of manufacturing polarizing plate - Google Patents
Method of manufacturing polarizing plate Download PDFInfo
- Publication number
- KR102024733B1 KR102024733B1 KR1020130075577A KR20130075577A KR102024733B1 KR 102024733 B1 KR102024733 B1 KR 102024733B1 KR 1020130075577 A KR1020130075577 A KR 1020130075577A KR 20130075577 A KR20130075577 A KR 20130075577A KR 102024733 B1 KR102024733 B1 KR 102024733B1
- Authority
- KR
- South Korea
- Prior art keywords
- film
- polarizer
- polarizing plate
- acrylate
- treatment
- Prior art date
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
-
- 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
- G02F1/133528—Polarisers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2329/00—Polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
Abstract
The present invention relates to a method for correcting the protruding visual recognition portion of a polarizing plate, and more particularly, to coat a photocurable resin composition containing a polarity improving agent on one surface of a polarizer in which an ionic foreign material is present to remove the ionic foreign material on the surface of the polarizer. By including the step, by correcting that the particular portion on the release film is recognized as protruding, it is possible to reduce the determination that the good polarizing plate is defective, so that the process efficiency can be significantly improved, the correction method of the projected visible portion of the polarizing plate It is about.
Description
The present invention relates to a method for correcting the projected visual recognition portion of a polarizing plate.
Along with the development of various image display devices such as liquid crystal display (LCD) and plasma display (PDP), research has been conducted to provide a polarizing plate having high polarization and transmittance in order to provide an image with excellent color reproducibility with high brightness. Has been. In general, a polarizing plate has a basic structure in which a polyvinyl alcohol (PVA) polarizer dyed with a dichroic dye or iodine and a acetylene (cellulose-based) protective film for protecting both sides of the polarizer are laminated. According to the display device, a retardation plate, a viewing angle compensation film, a brightness enhancement film, and the like may be additionally stacked on the protective film.
The polarizer applied to such a polarizing plate may not completely wash the ionic material on the surface of the polarizer during the manufacturing process, and thus ionic foreign matter may remain on the surface of the polarizer, which does not particularly affect the performance of the product.
However, since the polarizing plate is bonded to the display panel unit, the final product has a structure in which an adhesive layer and a release film are laminated on the protective film side bonded to the panel unit, and defect inspection is performed in this state. The polarizing plate including the polarizer present exists in the release film side when the release film of the part corresponding to the site where the ionic foreign material is present is recognized as protruding there is a problem that is determined to be defective even if there is no problem in the performance of the product.
Korean Patent Laid-Open No. 2012-122300 discloses a method for automatically inspecting a polarizer stain using color difference analysis.
An object of the present invention is to provide a method for correcting a projected visual recognition portion of a polarizing plate.
1. Coating method of the photocurable resin composition containing a polarity improving agent on one surface of the polarizer in which an ionic foreign material exists, and removing the ionic foreign material on the surface of a polarizer.
2. The method of 1 above, wherein the ionic foreign material remains on the surface of the polarizer without being washed in the polarizer manufacturing process.
3. In the above 1, the polarizer polyvinyl alcohol film, polyvinyl alcohol film dehydrated, polyvinyl alcohol film dehydrochlorinated, polyethylene terephthalate film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol air The method is a coalescent film, a cellulose film or a partially gumified film thereof.
4. The method of 1 above, wherein the polarity improving agent is water or alcohol.
5. according to the above 1, wherein the polarity improver is included in 0.5 to 10 parts by weight based on 100 parts by weight of the composition.
6. In the above 1, the step of laminating the polarizer, the photocurable resin layer, the protective film coated with the photocurable resin composition; And curing the photocurable resin layer to bond a polarizer and a protective film.
7. In the above 6, the protective film is a polyester film, cellulose film, polycarbonate film, acrylic film, styrene film, polyolefin film, vinyl chloride film, polyamide film, imide film, Sulfone film, polyether ketone film, polyphenylene sulfide film, vinyl alcohol film, vinylidene chloride film, vinyl butyral film, allylate film, polyoxymethylene film, urethane film, epoxy film or Method which is a silicone type film.
8. In the above 6, wherein the protective film is a surface treatment to be bonded to the polarizer primer treatment, plasma treatment, corona treatment, alkali treatment (saponification treatment) and low pressure UV treatment that is selected from the group consisting of easy treatment, Way.
The present invention corrects the recognition of a specific portion on the release film as protruding, and can reduce the discrimination of a good polarizing plate as defective, thereby significantly improving the process efficiency.
Figure 1 is a photograph that can confirm the ionic foreign material present at the interface of the protective film and the polarizer of the polarizing plate.
Figure 2 is a photograph showing whether the presence of the protruding visible portion of the release film of the polarizing plate prepared in Example 1.
Figure 3 is a photograph showing whether the presence of the protruding visible portion of the release film of the polarizing plate prepared in Comparative Example 1.
The present invention includes the step of coating a photocurable resin composition comprising a polarity improving agent on one surface of the polarizer in which the ionic foreign material is present to remove the ionic foreign material on the surface of the polarizer, thereby being recognized as a specific portion on the release film protruded It is possible to reduce the problem of discriminating that a good polarizing plate is judged to be defective, and therefore, the present invention relates to a method for correcting the projected viewing portion of the polarizing plate, which can significantly improve process efficiency.
The polarizer is usually manufactured through swelling, dyeing, crosslinking, stretching, washing with water, drying, etc., but the ionic substance on the surface of the polarizer may remain without being completely removed even after washing.
1 is an optical micrograph in which the ionic foreign material of the interface between the polarizer and the protective film in the polarizing plate including a polarizer having an ionic foreign material present on the surface.
As such, when a polarizing plate including a polarizer having ionic foreign substances on its surface is applied to a display panel, there is no particular problem in the performance of the product.
However, since the polarizing plate is adhered to the display panel part, the final product has a stacked structure in order of polarizer, protective film, adhesive layer, and release film, and thus the defect determination test is performed while the release film is laminated. In the polarizing plate including the polarizer in which the ionic foreign material is present, the release film of the portion corresponding to the portion in which the ionic foreign material is present is projected from the side of the release film, and thus the polarizing plate is determined to be defective.
In order to solve this problem, the present invention is coated with a photocurable resin composition containing a polarity improver on one surface of the polarizer in which the ionic foreign material is present, to remove the ionic foreign material on the surface of the polarizer. Thereby, it can suppress that a good polarizing plate is discriminated as defective.
Hereinafter, the present invention will be described in detail.
The method of correcting the protruding visual recognition portion of the polarizing plate of the present invention coats a photocurable resin composition including a polarity improving agent on one surface of the polarizer in which the ionic foreign material is present so as to remove the ionic foreign material on the surface of the polarizer.
In the present invention, the protruding viewing portion refers to a portion of the polarizing plate having a structure laminated in the order of the polarizer, the protective film, the adhesive layer, and the release film on the release film side, and the release film does not actually protrude, but appears to protrude.
The polarizer according to the present invention may be a polarizer commonly used in the art prepared according to a process including the steps of swelling, dyeing, crosslinking, stretching, washing, drying, and the like for forming a polarizer film.
The polarizer-forming film is not particularly limited as long as it is a dichroic substance, that is, a film that can be dyed with iodine, and the like, for example, a polyvinyl alcohol film, a polyvinyl alcohol film dehydrated, a polyvinyl alcohol film treated with dehydrochloric acid, Polyethylene terephthalate films, ethylene-vinyl acetate copolymer films, ethylene-vinyl alcohol copolymer films, cellulose films, partially gumified films thereof, and the like. Among them, polyvinyl alcohol-based films are preferred in that they are excellent in effect of enhancing uniformity in polarization degree and excellent in dyeing affinity for iodine.
The thickness of the film for polarizer formation is not specifically limited, For example, it may be 10-150 micrometers.
The swelling step is immersed in a swelling tank filled with an aqueous solution for swelling before dyeing the polarizer-forming film to remove impurities such as dust or antiblocking agent deposited on the surface of the polarizer-forming film and swelling the polarizer-forming film. It is a step to improve the physical properties of the polarizer by improving the efficiency and preventing dyeing nonuniformity.
As the aqueous solution for swelling, water (pure water, deionized water) can be usually used alone, and when a small amount of glycerin or potassium iodide is added thereto, the processability can be improved together with the swelling of the polymer film.
The content of glycerin and potassium iodide is not particularly limited, and may be, for example, 5 wt% or less and 10 wt% or less in the total weight of the aqueous solution for swelling.
The temperature of the swelling bath is not particularly limited, and may be, for example, 20 to 70 ° C, and preferably 25 to 55 ° C. In the case where the temperature of the swelling tank is 20 to 70 ° C., the stretching and dyeing efficiency is excellent thereafter, and the expansion of the film due to excessive swelling can be prevented.
The execution time (swelling tank dipping time) of the swelling step is not particularly limited, and may be, for example, 180 seconds or less, and preferably 90 seconds or less. When the immersion time is 180 seconds or less, it is possible to suppress excessive swelling and saturation, thereby preventing breakage due to softening of the polyvinyl alcohol-based film, and evenly adsorbing iodine in the dyeing step to improve polarization degree. have.
The swelling step is performed as necessary and can be omitted.
The dyeing step is a step of adsorbing iodine to the polarizer-forming film by immersing the polarizer-forming film in a dye bath filled with a dichroic material, for example, an aqueous solution for dyeing including iodine.
The dyeing aqueous solution may include water, a water-soluble organic solvent or a mixed solvent and iodine thereof. The content of iodine may be 0.01 to 1 part by weight based on 100 parts by weight of water.
The aqueous solution for dyeing may further include iodide as a dissolution aid to improve the dyeing efficiency.
The type of iodide is not particularly limited, and examples thereof include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and titanium iodide. Potassium iodide is preferred in view of its high solubility in water. These can be used individually or in mixture of 2 or more types.
The content of iodide is not particularly limited, and may be, for example, 0.5 to 20 parts by weight based on 100 parts by weight of water.
A dichroic dye may also be used as the dichroic material, in which case the dichroic dye may be included in an amount of 1 * 10 -4 to 10 parts by weight, and preferably 1 * 10 -3 to 1 part by weight based on 100 parts by weight of water. May be included.
The temperature of the dye bath is not particularly limited, and may be, for example, 5 to 45 ° C, and preferably 10 to 35 ° C.
Immersion time of the film for polarizer formation in a dye bath is not specifically limited, For example, it may be 20 second-30 minutes, Preferably it may be 2 to 10 minutes.
The crosslinking step is a step of fixing the adsorbed iodine molecules by immersing the dyed polarizer-forming film in an aqueous solution for crosslinking so that dyeability by physically adsorbed iodine molecules is not lowered by an external environment. Dichroic dyes are not often eluted in a humid environment, but iodine is often dissolved or sublimed depending on the environment when the crosslinking reaction is unstable, and sufficient crosslinking reaction is required.
The aqueous solution for crosslinking includes boron compounds such as water, boric acid, and sodium borate, which are solvents, and may further include an organic solvent that is mutually soluble with water.
The boron compound provides rigidity to the film for polarizer formation to suppress wrinkles during the process, thereby improving handleability and forming iodine orientation.
The content of the boron compound is not particularly limited, and may be, for example, 2 to 15 parts by weight, and preferably 5 to 12 parts by weight, based on 100 parts by weight of water.
The aqueous solution for crosslinking may further include a small amount of iodide in order to obtain uniformity of polarization degree in the polarizer plane.
Iodide may be the same as used in the dyeing step.
The content of iodide is not particularly limited, and may be, for example, 0.1 to 15 parts by weight, and preferably 5 to 12 parts by weight, based on 100 parts by weight of water. If the content of iodide is less than 0.1 part by weight with respect to 100 parts by weight of water, the iodide ions in the film may escape and the transmittance may increase and the color of the polarizer may change. This can be reduced.
The temperature of the crosslinking bath is not particularly limited, and may be, for example, 50 ° C or higher, preferably 50 to 85 ° C, more preferably 60 to 80 ° C.
Immersion time of the film for polarizer formation in a crosslinking tank may be 60 second to 1,200 second, Preferably it is 150 to 600 second, More preferably, it may be 200 to 400 second.
The order of the stretching step is not particularly limited, for example, may be performed before, after the dyeing step or after the crosslinking step, and may be performed simultaneously with one or more steps selected from the group consisting of a swelling step, a dyeing step and a crosslinking step. .
The stretching ratio of the stretching step is not particularly limited, and for example, the stretching ratio may be 4 to 8 times. If the cumulative draw ratio is within the above range, it is possible to maximize the durability improvement effect of the polarizer. In this specification, "cumulative draw ratio" represents the value of the product of draw ratios in each step.
The washing step is a step of removing the unnecessary residue such as boric acid attached to the film for forming the polarizer in the previous steps by immersing the polarizer forming film completed crosslinking and stretching in the washing tank filled with the aqueous solution for washing.
The aqueous solution for washing may be water (deionized water).
The temperature of the water washing tank is not particularly limited, and may be, for example, 5 to 60 ℃, preferably 10 to 40 ℃.
Immersion time of the film for polarizer formation in a water washing tank may be 1 to 120 second.
The washing step may be performed whenever previous steps such as dyeing step, crosslinking step or stretching step are completed. In addition, it may be repeated one or more times, and the number of repetitions is not particularly limited.
The drying step is a step of obtaining a polarizer having excellent optical properties by drying the washed polyvinyl alcohol-based film and further improving the orientation of the iodine molecules salted by the neck in by drying.
As a drying method, methods, such as natural drying, air drying, heat drying, far-infrared drying, microwave drying, and hot air drying, can be used.
The drying temperature is not particularly limited, and may be, for example, 30 to 100 ° C, and preferably 50 to 80 ° C.
The drying time is not particularly limited and may be appropriately performed so that the polarizer can be sufficiently dried, for example, may be performed for 1 to 10 minutes, preferably 2 to 10 minutes.
The thickness of the polarizer manufactured through the above process may be 5 to 40㎛.
The photocurable resin composition including the polarity improving agent according to the present invention is coated on one surface of the polarizer in which the ionic substance is not completely washed with ionic foreign material. In such a case, the ionic foreign material on the surface of the polarizer can be removed by desorption, thereby solving the problem of protruding visible after the release film is later bonded.
The polarity improver improves the polarity of the photocurable resin composition so that, when coated on the polarizer, the ionic foreign material present on the surface of the polarizer can be desorbed.
The polarity improving agent included in the photocurable resin composition of the present invention is not particularly limited as long as it can play the above role by improving the polarity of the composition, for example, may be water, alcohol, etc., in terms of maximizing the polarity improving effect Preferably water. These can be used individually or in mixture of 2 or more types.
The alcohol is not particularly limited, and examples thereof include methanol, ethanol, propanol, butanol, t-butanol, isopropanol, ethylene glycol, propylene glycol, glycerol and the like.
The content of the polarity improving agent is not particularly limited and may be appropriately selected so as to have compatibility in a photocurable resin composition which is usually hydrophobic while sufficiently exhibiting a polarity improving effect, for example, 0.5 to 10 based on 100 parts by weight of the resin composition. It may be included in parts by weight. If the content of the polar wettability improving agent is 0.5 to 10 parts by weight, it is possible to maximize the polarity improving effect and excellent compatibility.
The photocurable resin composition is a resin composition which is cured by irradiation of light, has excellent adhesiveness with a polarizer or a protective film, is a resin composition, and may include a photopolymerizable compound and a photopolymerization initiator.
The photopolymerizable compound may be an optical radical polymerizable compound or a photo cationic polymerizable compound.
As a radical photopolymerizable compound, a 1-6 functional monomer is mentioned, Specifically, methyl (meth) acrylate, allyl methacrylate, 2-ethoxyethyl (meth) acrylate, isodecyl (meth) acrylate , 2-dodecylthioethyl methacrylate, octyl acrylate, 2-methoxyethyl acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, Isooctyl (meth) acrylate, isodecyl (meth) acrylate, stearyl (meth) acrylate, tetraperfuryl (meth) acrylate, phenoxyethyl (meth) acrylate, urethane acrylate, aminoethyl (meth Monofunctional monomers such as) acrylate and dimethylaminoethyl (meth) acrylate; 1,3-butanedioldi (meth) acrylate, 1,4-butanedioldi (meth) acrylate, 1,6-hexanedioldi (meth) acrylate, ethylene glycoldi (meth) acrylate, bisphenol A-ethylene Glycol diacrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, dipropylene glycol di (meth) Acrylate, neopentyl glycol di (meth) acrylate, dicyclopentanyldi (meth) acrylate, caprolactone modified dicyclopentenyldi (meth) acrylate, ethylene oxide modified phosphate di (meth) acrylate, bis (2 -Hydroxyethyl) isocyanurate di (meth) acrylate, di (acryloxyethyl) isocyanurate, allylated cyclohexyldi (meth) acrylate, dimethyloldicyclopentanediacrylate , Ethylene oxide-modified hexahydrophthalic acid diacrylate, tricyclodecane dimethanol diacrylate, neopentyl glycol-modified trimethylolpropane diacrylate, adamantyl bifunctional monomers such as tandi acrylate; Trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane Trifunctional monomers such as tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, and glycerol tri (meth) acrylate ; Tetrafunctional monomers such as diglycerin tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate; Pentafunctional monomers such as propionic acid-modified dipentaerythritol penta (meth) acrylate; And six-functional monomers such as caprolactone-modified dipentaerythritol hexa (meth) acrylate, and the like, and among these, 1-3 functional monomers are preferable. These can be used individually or in mixture of 2 or more types.
As a photocationic polymerizable compound, Bisphenol-type epoxy resins, such as a bisphenol-A epoxy resin and a bisphenol F-type epoxy resin; Novolak-type epoxy resins, such as a phenol novolak-type epoxy resin and a cresol novolak-type epoxy resin; Aliphatic epoxy resins, alicyclic epoxy resins, naphthalene type epoxy resins, polyfunctional epoxy resins, biphenyl type epoxy resins, glycidyl ether type epoxy resins, glycidyl ester type epoxy resins, glycidylamine type epoxy resins; Alcohol type epoxy resins such as hydrogenated bisphenol A type epoxy resins; Halogenated epoxy resins such as brominated epoxy resins; Epoxy group-containing compounds such as rubber-modified urethane resins, urethane-modified epoxy resins, epoxidized polybutadienes, epoxidized styrene-butadiene-styrene block copolymers, epoxy group-containing polyester resins, epoxy group-containing polyurethane resins, and epoxy group-containing acrylic resins; Phenoxymethyloxetane, 3,3-bis (methoxymethyl) oxetane, 3,3-bis (phenoxymethyl) oxetane, 3-ethyl-3- (phenoxymethyl) oxetane, 3-ethyl- 3- (2-ethylhexyloxymethyl) oxetane, 3-ethyl-3-{[3- (triethoxysilyl) propoxy] methyl} oxetane, phenol novolac oxetane, 1,4-bis {[ Oxetanyl-group containing compounds, such as (3-ethyl 3- oxetanyl) methoxy] methyl} benzene, etc. are mentioned, These can be used individually or in mixture of 2 or more types.
The photopolymerization initiator is for improving the efficiency of the curing reaction, and may include photo radical polymerization initiators such as acetophenone series, benzophenone series, thioxanthone series, benzoin series and benzoin alkyl ether series; Aromatic diazonium salt, aromatic sulfonium salt, aromatic iodide aluminum salt, benzoin sulfonic acid ester, etc. are mentioned. As photocationic polymerization initiators, commercially available products, Oputoma-SP-151, Oputoma-SP-170, Oputoma-SP-171 (Asahi Telephone Co., Ltd.), Igacure-261 (Shiba Corporation), and Seaside SI -60L, UVI-6990 (Union Carbide Corporation), BBI-1C3, MPI-103, TPS-103, DTS-103, NAT-103, NDS-103 (Midori Chemical Co., Ltd.), CPI-110A (San Eprosa), etc. You can also listen. These can be used individually or in mixture of 2 or more types.
The content of the photopolymerization initiator is not particularly limited, and may be included in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the photopolymerizable compound. When the content is within the above range, it has an appropriate curing rate and has excellent durability.
The coating method of the photocurable resin composition is not particularly limited, and methods known in the art may be used, for example, bar coater, air knife, gravure, reverse roll, kiss roll, spray, blade, die coater, casting, spin Methods such as coating can be used.
The coating thickness of a photocurable resin composition is not specifically limited, For example, it can coat with 0.01-10 micrometers, Preferably it is 0.5-5 micrometers.
After coating the photocurable resin composition, the polarizing plate may be manufactured by bonding to a protective film commonly used in the art.
According to one embodiment, the polarizer coated with the photocurable resin composition is laminated in the order of a polarizer, a photocurable resin layer, and a protective film.
The protective film may be laminated on one or both sides of the polarizer.
The protective film is not particularly limited as long as the film is excellent in transparency, mechanical strength, thermal stability, moisture shielding, and isotropy. Specifically, polyester film, such as polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate; Cellulose films such as diacetyl cellulose and triacetyl cellulose; Polycarbonate film; Acrylic films such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene films such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin-based films such as cycloolefin, cycloolefin copolymer, polynorbornene, polypropylene, polyethylene, and ethylene propylene copolymer; Vinyl chloride film; Polyamide films such as nylon and aromatic polyamides; Imide film; Sulfone film; Polyether ketone film; Sulfided polyphenylene-based films; Vinyl alcohol film; Vinylidene chloride-based film; Vinyl butyral film; Allylate film; Polyoxymethylene film; Urethane film; Epoxy film; Silicone film etc. are mentioned. Among these, especially the cellulose type film which has the surface saponified by saponification by alkali etc. is preferable in consideration of polarization characteristic or durability. The protective film may also have an optical compensation function such as a phase difference function.
The thickness of the protective film is not particularly limited, and may be, for example, 10 to 200 μm, and preferably 10 to 150 μm.
The protective film may be one in which an easy bonding process for improving bonding strength is performed on the surface to be bonded to the polarizer.
The easy bonding treatment is not particularly limited as long as it can improve the bonding strength between the polarizer and the protective film, and examples thereof include dry treatment such as primer treatment, plasma treatment, and corona treatment; Chemical treatments such as alkali treatment (saponification treatment); Low pressure UV treatment; and the like.
Thereafter, the photocurable resin layer is cured to bond a polarizer and a protective film.
Curing of the photocurable resin layer is carried out by ultraviolet irradiation, and the irradiation method is not particularly limited, and for example, low pressure mercury lamp, medium pressure mercury lamp, high pressure mercury lamp, ultra high pressure mercury lamp, microwave mercury lamp, chemical lamp, black light lamp, metal halide Using a lamp or the like, a light source having a light emission distribution at a wavelength of 400 nm or less can be irradiated with an integrated light amount of 10 to 5,000 mJ / cm.
In addition, the method of correcting the protrusion of the polarizing plate of the present invention comprises the steps of forming an adhesive layer on one surface of the protective film bonded to the display panel portion; And bonding a release film on the adhesive layer.
The adhesive layer is a layer bonded to the display panel portion, and is formed by coating the pressure-sensitive adhesive composition on one surface of the protective film on the side bonded to the display panel portion.
The pressure-sensitive adhesive composition is not particularly limited and may be used pressure-sensitive adhesive composition commonly used in the art, for example, pressure-sensitive adhesive composition containing acrylic resin, silicone resin, styrene resin, polyester resin, rubber resin, urethane resin and the like. Can be used. These can be used individually or in mixture of 2 or more types.
As a coating method of an adhesive composition, the method similar to the coating method of the said photocurable resin composition can be used.
Thereafter, a release film is bonded onto the adhesive layer.
The release film is a film for protecting the adhesive layer, and specifically, a polyolefin film, a polyester film, an acrylic film, a styrene film, an amide film, a polyvinyl chloride film, a polyvinylidene chloride film, a polycarbonate film, or the like These can be mentioned, These may be a mold release process suitably by silicone type, a fluorine type, a silica powder, etc.
In the polarizing plate, the ionic foreign material on the surface of the polarizer is removed, and a phenomenon in which the release film part corresponding to the ionic foreign material present site is protruded when viewed from the release film side does not occur. Thereby, the good polarizing plate can be prevented from being judged as defective, and process efficiency can be improved.
Hereinafter, preferred examples are provided to aid the understanding of the present invention, but these examples are merely illustrative of the present invention and are not intended to limit the scope of the appended claims, which are within the scope and spirit of the present invention. It is apparent to those skilled in the art that various changes and modifications can be made to the present invention, and such modifications and changes belong to the appended claims.
Example And Comparative example
(One) Polarizer Produce
A 75 μm thick polyvinyl alcohol film having an average degree of polymerization of 2,400 and a saponification degree of 99.9 mol% or more was uniaxially stretched by about 5 times dry, and immersed in water (distilled water) at 60 ° C. for 1 minute while maintaining the stretched state. After immersion for 60 seconds in an aqueous solution of 28 ℃ having a weight ratio of iodine / potassium iodide / distilled water of 0.05 / 5/100. Thereafter, the weight ratio of potassium iodide / boric acid / distilled water was immersed in an aqueous 72 ° C. solution having a ratio of 8.5 / 8.5 / 100 for 300 seconds, washed for 20 seconds with distilled water at 26 ° C., and dried at 65 ° C. to iodine adsorbed orientation Was prepared.
(2) Preparation of Polarizing Plate
Surface bonded to the polarizer of the stretched norbornene-based protective film (thickness 70 μm) and polymethyl methacrylate film (thickness 70 μm) marked with a name pen on the part corresponding to the site where the ionic foreign material on the surface of the polarizer is present. Corona discharge treatment was performed.
Thereafter, on the corona discharge treatment surface of the stretched norbornene-based resin film, a photocurable resin composition for correcting the protrusion visual recognition region having a content and composition shown in Table 1 below was coated with a bar coater to a thickness of 3 μm, and the polarizer was laminated thereon. It was.
The photocurable resin composition for protrusion recognition site | part correction was also similarly coated also to the polymethylmethacrylate film, and it laminated | stacked on the other surface of the polarizer.
Subsequently, the laminate was irradiated with ultraviolet rays at a UVA reference accumulated light amount of 300 mJ / cm 2 from one surface by an ultraviolet irradiation device (Fusion Fusion H valve) with a belt conveyor to cure the resin layer to form a polarizer and a protective film. The polarizing plate was manufactured by bonding.
The composition of the photocurable resin composition in each Example and the comparative example is as shown in Table 1 below.
(A)
(B)
(C)
A-2: 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate
A-3: 4-hydroxybutyl acrylate
A-4: dimethylaminoethyl acrylate
B-1: CPI-110A (San Eprosa)
B-2: Irg184 (Shibasa)
C-1: water
C-2: propanol
C-3: propylene glycol
Experimental Example
(1) adhesive evaluation
After the polarizing plates prepared in Examples and Comparative Examples were left at room temperature for 1 hour, when the blade of the cutter was pushed between the polarizer and the protective film, the adhesiveness between the polarizer and the protective film was evaluated to the extent that the blade enters.
◎: Cutter blade does not enter between polarizer and protective film
○: cutter blade enters 2 mm or less between polarizer and protective film
(Triangle | delta): The blade of a cutter enters more than 2 mm-5 mm or less between a polarizer and at least one protective film.
X: The blade of the cutter goes all the way between the polarizer and at least one protective film
(2) Hot water resistance evaluation
After leaving the polarizing plates prepared in the above Examples and Comparative Examples for 24 hours at 23 ° C. and 55% RH, a 5 cm × 2 cm sample was prepared with the absorption axis (stretching direction) on the long side. Thereafter, the short sides of the samples were gripped, and 80% of the longitudinal direction was immersed in a 60 ° C. water bath for 4 hours, and then removed to wipe off moisture.
Since the polarizer shrinks by immersion in warm water, the distance from the end of the protective film in the center of the short side of the sample to the contracted polarizer was measured to make the shrinkage length.
In addition, since iodine eluted from the periphery part of a polarizer and discolored by warm water immersion, the distance from the contracted polarizer end of the short side of a sample to the part which has not been discolored was made into the iodine stripping length.
The sum of the contraction length and the iodine omission length was taken as the total erosion length. That is, the total erosion length is the distance from the end of the protective film at the center of the short side of the sample to the undiscolored portion of the polarizer. The smaller the immersion length, the better the water resistance.
◎ ： Total erosion length is less than 2mm
○: Total erosion length is 2 mm or more but less than 3 mm
△: Total erosion length is 3 mm or more and less than 5 mm
X: Total erosion length is 5mm or more
(3) evaluation of protrusion visual recognition
In the polarizing plates prepared in Examples and Comparative Examples, after performing a corona treatment on the side of the protective film bonded to the panel portion, a roll laminator (25 degrees, speed 5m / min) of the release film on the protective film with an acrylic double-sided adhesive It bonded by using.
After that, in the reflection mode (x100 times) of the optical microscope (SMZ800, Nikon Corporation), it was evaluated whether there was a part that is recognized as protruding from the release film.
In addition, the site | part corresponding to the marking-marked site | part in the release film of the polarizing plate of Example 1 and the comparative example 1 was image | photographed (refer FIG. 2 and 3).
(Circle): There is no site recognized as projected
(Triangle | delta): There exists a site recognized as having protruded finely
X: There exists the site recognized as extruded
Referring to Table 2, the polarizing plates of Examples 1 to 15 do not exist in the release film is recognized as a protruding portion, or only a portion that is recognized as being protruded finely, confirming that the protruding visible portion is corrected It was. And the adhesiveness and the hot water resistance were also excellent.
Referring to FIG. 2, it can be seen that the polarizing plate of Example 1 looks flat without any part where the part corresponding to the marking-marked part appears to protrude.
However, in the polarizing plates of Comparative Examples 1 to 3, a portion was recognized as protruding from the release film.
Referring to FIG. 3, it can be seen that the polarizing plate of Comparative Example 1 is recognized as having protruded a portion corresponding to the marked portion.
Claims (8)
Stacking a protective film on the photocurable resin composition coated on the polarizer; And
A method for producing a polarizing plate, comprising curing the coated photocurable resin composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130075577A KR102024733B1 (en) | 2013-06-28 | 2013-06-28 | Method of manufacturing polarizing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130075577A KR102024733B1 (en) | 2013-06-28 | 2013-06-28 | Method of manufacturing polarizing plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20150003012A KR20150003012A (en) | 2015-01-08 |
| KR102024733B1 true KR102024733B1 (en) | 2019-09-25 |
Family
ID=52475990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020130075577A KR102024733B1 (en) | 2013-06-28 | 2013-06-28 | Method of manufacturing polarizing plate |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR102024733B1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012118201A (en) | 2010-11-30 | 2012-06-21 | Sumitomo Chemical Co Ltd | Optical film and polarizing plate using the same |
| JP2012155147A (en) * | 2011-01-26 | 2012-08-16 | Nitto Denko Corp | Method for manufacturing polarizing plate |
| JP2013061365A (en) | 2011-09-12 | 2013-04-04 | Konica Minolta Advanced Layers Inc | Polarizer plate protection film and polarizer plate |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7695780B2 (en) * | 2004-02-26 | 2010-04-13 | Fujifilm Corporation | Optical film, optical compensation sheet, polarizing plate, and liquid crystal display device |
| TW200632002A (en) * | 2004-11-30 | 2006-09-16 | Fuji Photo Film Co Ltd | Polarizing plate and liquid crystal display device comprising the same |
| JP5296575B2 (en) * | 2009-03-06 | 2013-09-25 | 住友化学株式会社 | Photocurable adhesive composition, polarizing plate and method for producing the same, optical member and liquid crystal display device |
| KR101440974B1 (en) | 2011-04-28 | 2014-09-17 | 주식회사 엘지화학 | Automatic inspection method for stain in the polarizing plate using color difference analysis |
-
2013
- 2013-06-28 KR KR1020130075577A patent/KR102024733B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012118201A (en) | 2010-11-30 | 2012-06-21 | Sumitomo Chemical Co Ltd | Optical film and polarizing plate using the same |
| JP2012155147A (en) * | 2011-01-26 | 2012-08-16 | Nitto Denko Corp | Method for manufacturing polarizing plate |
| JP2013061365A (en) | 2011-09-12 | 2013-04-04 | Konica Minolta Advanced Layers Inc | Polarizer plate protection film and polarizer plate |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20150003012A (en) | 2015-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI601800B (en) | Active energy ray-curable adhesive composition, polarizing adhesive composition, polarizing adhesive composition, polarizing adhesive composition, | |
| KR102368582B1 (en) | Polarizing plate | |
| CN108351454B (en) | Polarizing plate and image display device including the same | |
| KR102121279B1 (en) | Process for Preparing Polarizer | |
| KR101938411B1 (en) | Polarizing plate | |
| KR20160091014A (en) | Polarizer and preparing method for the same | |
| KR20110131512A (en) | Polarizing plate and method for preparing the same | |
| KR102030636B1 (en) | Photocurable adhesive composition for polarizing plate | |
| JP6257680B2 (en) | Manufacturing method of polarizing film, laminated film | |
| KR102443829B1 (en) | Optical laminate | |
| KR20150017446A (en) | Polarizing plate and preparing method thereof | |
| KR102024733B1 (en) | Method of manufacturing polarizing plate | |
| KR102181860B1 (en) | Adhesive composition and polarizing plate comprising adhesive layer formed by using the same | |
| KR20140091217A (en) | Preparing method for polarizing plate | |
| KR102096980B1 (en) | Polarizing plate | |
| CN107709496B (en) | Adhesive, adhesive body, and method for producing adhesive body | |
| KR102026881B1 (en) | Correcting method for pressed area of the polarizer or protective film | |
| KR20130074942A (en) | Method for preparing polarizing plate, polarizing plate, and display device comprising the same | |
| TWI673522B (en) | Polarizing plate | |
| KR102675683B1 (en) | Method for manufacturing polarizing plates | |
| JP2017182022A (en) | Method for manufacturing polarizing film and laminate film | |
| KR101988982B1 (en) | Polarizing plate and preparing method thereof | |
| KR20160107458A (en) | Adhesive composition and polarizing plate using the same | |
| KR102388999B1 (en) | Process for Preparing Polarizing Plate | |
| KR20150031350A (en) | Adhesive composition for polarizing plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant |