KR20140080356A - Method for preparing polarizing plate - Google Patents
Method for preparing polarizing plate Download PDFInfo
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- KR20140080356A KR20140080356A KR1020120150058A KR20120150058A KR20140080356A KR 20140080356 A KR20140080356 A KR 20140080356A KR 1020120150058 A KR1020120150058 A KR 1020120150058A KR 20120150058 A KR20120150058 A KR 20120150058A KR 20140080356 A KR20140080356 A KR 20140080356A
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- polarizer
- polarizing plate
- film
- laminate
- optical film
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- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- C08L29/00—Compositions of 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 an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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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
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- 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
- G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—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 comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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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
- 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
-
- 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
- C08J2329/00—Characterised by the use of 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 an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Nonlinear Science (AREA)
- Materials Engineering (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
Abstract
The present invention relates to a method for producing a polarizing plate in which polarizing properties are imparted to a polyvinyl alcohol film among a first laminate in which a polyvinyl alcohol film is laminated on both surfaces of a substrate and a first polarizer and a second polarizer are laminated on the other surface A first polarizer and a second polarizer are laminated on the first polarizer and the second polarizer, respectively, and a first optical film and a second optical film are laminated on each of the first polarizer and the second polarizer, A method for producing a third laminate in which a first polarizing plate including one optical film and a second polarizing plate including the second polarizing film and a second optical film are laminated, And separating the polarizing plate and the second polarizing plate, respectively, to produce two polarizing plates.
Description
The present invention relates to a method for producing a polarizing plate. More specifically, the present invention relates to a method of producing a polarizing plate capable of producing two polarizing plates in a single step and minimizing the occurrence of curl of a laminate of a substrate and a polarizing plate during a polarizing plate manufacturing process.
Conventionally, a polarizing plate has a polyvinyl alcohol (PVA) resin film stretched in a predetermined direction and a dichroic polarizing material including an iodine compound is adsorbed and oriented. 2. Description of the Related Art Recently, a market for a slim liquid crystal display device such as a slim large wall-mounted TV, a mobile type computer, and the like is rapidly expanding. Accordingly, there is a demand for a thin film type polarizing plate which is made thin and light in order to thin the entire module of the liquid crystal display device. In addition, with the development of OLED technology, researches on flexible displays have been accelerated, and demand for low shrinkage thin film films is accelerating. However, since the polyvinyl alcohol film used in the polarizer is subjected to an elongation treatment, contraction in the stretching direction occurs after commercialization. Therefore, it is required to reduce the thickness to solve this problem.
As a method of producing a thin film polarizer, a method of producing a polarizer integrated with a substrate is most widely used. However, in the above method, there is a problem that the yield is lowered due to the problem of polarizing plate production such as curl by forming a protective film on one side only.
In order to produce a substrate-type thin film polarizing film by a conventional method, the PVA itself is reduced in thickness and laminated on a substrate and stretched. However, when the protective film is peeled off after the laminating process, the yield of the process is not high due to the problem of curling, and the productivity may be low.
An object of the present invention is to provide a process for producing a thin film polarizer excellent in productivity.
Another object of the present invention is to provide a method for producing a polarizing plate which prevents curl from occurring during the production of polarizing plate.
A polarizing plate manufacturing method of the present invention is a polarizing plate manufacturing method in which a polarizing property is imparted to a polyvinyl alcohol film among a first laminate in which a polyvinyl alcohol film is laminated on both surfaces of a substrate, A first polarizer and a second polarizer are laminated on the first polarizer and the second polarizer, and a first optical film and a second optical film are laminated on one side of each of the first polarizer and the second polarizer, A third laminate in which a first polarizer plate including the first polarizer and the first optical film and a second polarizer plate including the second polarizer and the second optical film are laminated is manufactured, And peeling the first polarizing plate and the second polarizing plate from the substrate to produce two polarizing plates.
The present invention provides a method of producing a polarizing plate capable of producing two polarizing plates in one step and minimizing curling.
1 is a conceptual view of a method of manufacturing a polarizing plate according to one embodiment of the present invention.
A polarizing plate manufacturing method of the present invention is a polarizing plate manufacturing method in which polarizing properties are imparted to a polyvinyl alcohol film of a first laminate in which a polyvinyl alcohol film is laminated on both surfaces of a substrate to produce a second laminate in which polarizers are laminated on both surfaces of the substrate ; Laminating an optical film on each of the surfaces of the polarizer, and producing a third laminate in which the polarizer and the polarizing plate including the optical film are laminated on both surfaces of the substrate; And peeling each of the polarizing plates from the substrate to produce two polarizing plates.
1 is a conceptual view of a method of manufacturing a polarizing plate according to one embodiment of the present invention.
1, the present invention can produce a polarizing plate by using the
The substrate is a film made of a polypropylene (PP) resin, but not limited thereto. The thickness of the base material may be 50 占 퐉 to 200 占 퐉, preferably 70 占 퐉 to 120 占 퐉.
The polyvinyl alcohol-based film may be a commercially available product or one produced by a solvent casting method, a melt extrusion method, or the like. In the solvent casting method, a solution in which a resin is dissolved in a solvent is coated on a casting roll or a belt, and then the solvent is evaporated to produce a film. In the melt extrusion method, the resin is melted by raising the melting temperature or higher and then extruded and cooled in a cold roll to produce a film.
The first laminate may be produced by a solvent casting method. That is, a thin film polyvinyl alcohol-based film can be laminated on both sides of the substrate, or a polyvinyl alcohol-based resin can be applied to the substrate and dried to produce the first laminate as a substrate-integrated type. A thin film polarizing plate can be manufactured by preparing it as a monolithic substrate.
The 'integrated monolithic substrate' may mean that the polyvinyl alcohol-based film is laminated on the substrate. The first laminate may be a product in which a polyvinyl alcohol film is laminated on both surfaces of the substrate.
The
The polarizer manufacturing process imparts a polarizing property to the polyvinyl alcohol-based film in the first laminate, and may include a process including dyeing, stretching, and the like. That is, the polyvinyl alcohol film can be made into the first polarizer and the second polarizer through the polarizer manufacturing process.
The polyvinyl alcohol film may be washed and swelled before dyeing. The washing process can remove foreign substances and the like present in the polyvinyl alcohol film. The swelling step is a step of swelling the subsequent dyeing step so as to smoothly proceed. That is, the polyvinyl alcohol film is passed through a swelling tank containing water or a chloride, boric acid, inorganic acid, organic solvent and the like. The temperature of the swelling bath can be maintained at a temperature of 20 to 40 캜. The manufacture and selection of the swelling bath can be easily carried out by a person having ordinary skill in the art to which the present invention belongs.
It can be dyed with a dichroic material which imparts a polarizing property to the swollen polyvinyl alcohol film. The dichroic material may be iodine or dichroic dye. In addition to iodine, the iodine dyeing vessel for dyeing with iodine molecules may further contain potassium iodide, and may further include boric acid. The iodine staining may be performed at a temperature of 20-40 < 0 > C. In the iodine dyeing tank, the concentration of iodine may be 0.1-0.5 wt%, the concentration of potassium iodide may be 0.5-1.5 wt%, and the concentration of boric acid may be 0-1 wt%.
After the dyeing process, the crosslinking process can be further roughened. That is, it is for strongly attaching the iodine molecule to the polyvinyl alcohol polymer matrix. The crosslinking agent may be boric acid, and may further contain phosphoric acid compounds and the like.
The dyed (stained) polyvinyl alcohol film may undergo a stretching process. As the stretching method, both dry stretching and wet stretching are possible. As the dry type softening method, an inter-roll stretching method, a compression stretching method, a heated roll stretching method, or the like can be used. It is also possible to carry out wet drawing after dry drawing.
The stretching bath for wet stretching may include boric acid. The temperature of the stretching bath may be in the range of 50-90 占 폚. The concentration of boric acid in the stretching tank may be 1-5% by weight.
The elongation can be made to be the same or different from that of the first polarizer and the second polarizer. In an embodiment, the difference in elongation between the first polarizer and the second polarizer may be 0-1%. In the above range, curling can be prevented in the step of drying after attaching the optical film.
In one embodiment, the elongation of the first polarizer can be 500-700%, and the elongation of the second polarizer can also be 500-700%.
The stretching process may be performed simultaneously with the dyeing process, or may be performed simultaneously with the crosslinking process. In the case of simultaneous with the dyeing step, it may be carried out in a solution containing iodine, and in the case of simultaneous with the cross-linking step, it may proceed in a solution containing boric acid.
After the stretching process, a boric acid treatment may be added. The boric acid treatment process may include a step of treating the first laminate in a solution containing 1-5% by weight of boric acid.
The polyvinyl alcohol film that has undergone the stretching process may undergo a complementary process for color correction. The complementary process can be carried out through a borohydrone containing potassium iodide and / or boric acid, but is not limited thereto. The complementary process may be carried out in a boron color bath containing 1-5% by weight of potassium iodide and 1-3% by weight of boric acid.
The polarizer produced therefrom is dried through a drying zone. During the drying process, the drying temperature, the retention path of the polarizer, and the air volume in the drying zone can be controlled. The drying temperature may be 50-100 ° C.
It is preferable that the difference in thickness between the first polarizer and the second polarizer is 0-3 탆. Within this range, curl can be prevented.
The thickness ratio of the first polarizer to the second polarizer is preferably 1: 1 to 1: 1.1. Within this range, curl can be prevented.
The thickness of each of the first polarizer and the second polarizer may be 3-100 占 퐉, preferably 3-20 占 퐉, more preferably 3-10 占 퐉.
Then, the third
The
The first
The first optical film and the second optical film may include at least one of a protective film and a retardation film.
The protective film is a film having transparency, which is conventionally used as a protective film of a polarizer, and is not particularly limited. For example, the protective film may be a film of a cellulose, a polyester, a cyclic polyolefin, a polycarbonate, a polyether sulfone, a polysulfone, a polyamide, a polyimide, a polyolefin, a polyarylate, Based, polyvinyl chloride-based, and polyvinylidene chloride-based materials.
The retardation film can be used without limitation as long as it is a film having a? / 2 or? / 4 retardation function. For example, a film made of an olefinic, acrylic, cellulose, or a mixture thereof including a cycloolefin polymer (COP) can be used.
The ratio of the thickness of the first optical film to the thickness of the second optical film may be 1: 1 to 1: 1.5. In the above range, it can be used for a polarizing plate, and curling may not occur during drying after bonding an optical film.
The thickness of each of the first optical film and the second optical film may be 10 탆 to 100 탆. Within this range, it is possible to use a polarizing plate, to provide a thin film polarizing plate, and to prevent curling. Preferably 10 占 퐉 to 60 占 퐉.
The lamination of the optical film may be carried out by a conventional method using an adhesive layer. The lamination of the optical film by the adhesive layer can be performed by applying an adhesive or by laminating an adhesive film.
That is, as shown in Fig. 1, an adhesive can be applied to each of the polarizers from the
Alternatively, an adhesive layer formed on the polarizer can be formed using an adhesive film formed on the release film.
The adhesive may include at least one of an aqueous adhesive and a pressure-sensitive adhesive. In an embodiment, an acrylic adhesive may be used.
Then, the
Further, the third layered product may be subjected to a drying step (60) in order to increase the degree of adhesion between the polarizer and the optical film. The drying process is not limited, but may be carried out at 50-90 占 폚 for 1-5 minutes. In this range, curl may not occur.
The pressing and drying process may be performed at the same time or may be changed in order.
Further, before the drying step, the length of the first optical film and the length of the second optical film in the third laminate is set to be equal to the length of the first polarizer and the second polarizer, It is possible to further perform a step of cutting the end portion.
Then, the
The peeling can be carried out by both winding rolls.
And the length of the first optical film and the second optical film in the third laminate is equal to the length of the first polarizer and the second polarizer after the drying and the peeling, It is possible to further perform a step of cutting the end portion.
In order to prevent the wrinkles from being generated by applying pressure to the polarizing plate in the process of peeling the polarizing plate from the base material, the pressing may be performed by the
The thickness of the first polarizing plate and the second polarizing plate may be 20-120 mu m. Within this range, it can be used as a polarizing plate of an optical display device including a liquid crystal display device.
Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.
Example
A laminate having a polyvinyl alcohol film laminated on both sides of a polypropylene substrate was immersed in a dyeing solution containing iodine and potassium iodide at 30 캜. The iodine content of the dyeing solution was 0.1 parts by weight based on 100 parts by weight of water, and the amount of potassium iodide was 1.5 parts by weight. And then uniaxially stretched at an elongation of 580% in an aqueous solution of boric acid at 55 ° C. The stretched laminated film was taken out from the aqueous solution of boric acid and dried by hot air at 60 캜. On each side of the polarizer, a triacetyl cellulose film having a thickness of 40 mu m was stacked on each polarizer side as a protective film using an acrylic adhesive as an aqueous adhesive. Dried at 70 DEG C for 3 minutes, and 2 polarizers were peeled off from the substrate.
Comparative Example
Except that a polyvinyl alcohol film was laminated on only one surface of the polypropylene base film in the above example, a polarizing plate was manufactured.
The curl was evaluated with respect to the laminate before the polarizing plate peeling in the above process. A laminate having a size of 100 mm x 150 mm (total thickness of embodiment: 115 mu m, comparative example: 70 mu m) was prepared at 25 DEG C, and the height of the four corners of the floor was measured. Curl means the maximum height at which the laminate is curved with respect to the bottom. The laminate according to the examples had a curl of 1-3 mm, whereas the laminate according to the comparative example had a curl of 10-30 mm, indicating that curl was low and two polarizers could be produced at the same time according to the present invention Respectively.
Claims (13)
A first optical film and a second optical film are laminated on one surface of each of the first polarizer and the second polarizer, and a second polarizer and a second optical film are laminated on one surface of the substrate, Producing a third laminate in which a first polarizer, a second polarizer including the second polarizer and a second optical film are laminated, and
And peeling the first polarizing plate and the second polarizing plate from the substrate of the third laminate to produce two polarizing plates.
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KR1020120150058A KR20140080356A (en) | 2012-12-20 | 2012-12-20 | Method for preparing polarizing plate |
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KR1020120150058A KR20140080356A (en) | 2012-12-20 | 2012-12-20 | Method for preparing polarizing plate |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20150052772A (en) * | 2013-11-06 | 2015-05-14 | 후지필름 가부시키가이샤 | Method for manufacturing polarizing plate |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20150052772A (en) * | 2013-11-06 | 2015-05-14 | 후지필름 가부시키가이샤 | Method for manufacturing polarizing plate |
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