WO2015046765A1 - Procédé de fabrication de lame polarisante mince unilatérale - Google Patents

Procédé de fabrication de lame polarisante mince unilatérale Download PDF

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Publication number
WO2015046765A1
WO2015046765A1 PCT/KR2014/008067 KR2014008067W WO2015046765A1 WO 2015046765 A1 WO2015046765 A1 WO 2015046765A1 KR 2014008067 W KR2014008067 W KR 2014008067W WO 2015046765 A1 WO2015046765 A1 WO 2015046765A1
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WO
WIPO (PCT)
Prior art keywords
film
polarizer
polarizing plate
thin polarizing
manufacturing
Prior art date
Application number
PCT/KR2014/008067
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English (en)
Korean (ko)
Inventor
조해성
김성현
손현희
하동균
박광승
이남정
박준욱
황태준
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020140112653A external-priority patent/KR101614211B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to EP14848615.2A priority Critical patent/EP3054328B1/fr
Priority to US15/024,561 priority patent/US10029449B2/en
Priority to JP2016545670A priority patent/JP2016540259A/ja
Priority to CN201480053839.XA priority patent/CN105593718B/zh
Publication of WO2015046765A1 publication Critical patent/WO2015046765A1/fr

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    • 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

Definitions

  • the present invention relates to a method for producing a single-sided thin polarizing plate.
  • Polarizers are optical elements for making natural light or arbitrary polarization into polarized light in a specific direction, and are widely used in display devices such as liquid crystal display devices and organic light emitting devices (OLEDs).
  • the polarizing plate used in the display device has been used as a structure in which a protective film is laminated on both sides of a polarizer made of a polyvinyl alcohol (hereinafter referred to as 'PVA') resin, which is usually dyed with a dichroic dye or iodine. .
  • 'PVA' polyvinyl alcohol
  • the polarizer also needs to have a thinner thickness. Accordingly, a technique of manufacturing a single-sided polarizing plate which attaches a protective film only to one surface of the polarizer, or a technique of forming a thin film of polyvinyl alcohol (hereinafter referred to as PVA) as a polarizer thinly to 50 ⁇ m or less It is proposed.
  • PVA polyvinyl alcohol
  • the manufacturing method of the conventional single-sided polarizing plate manufactured by the method of supplying a protective film to one side of PVA apply
  • a thin polarizer having a thickness of 50 ⁇ m or less may be used in the process of manufacturing the single-sided polarizing plate, and even if the width of the adhesive composition is slightly wider than the width of the polarizer, contamination may be easily and simply prevented from occurring in the manufacturing process. Development of technology is required.
  • the present invention is to solve the above problems, using a thin polarizer with a thickness of 50 ⁇ m or less, the thickness is remarkably thin, can easily prevent the occurrence of contamination in the manufacturing process, excellent workability, economical and
  • An object of the present invention is to provide a method for manufacturing a highly productive one-sided thin polarizing plate.
  • the present invention the step of supplying a process film to one surface of the polarizer having a thickness of 50 ⁇ m or less; Supplying a protective film to the other surface of the polarizer; Supplying an adhesive composition between the polarizer and the protective film to form an adhesive layer; Arranging a pair of pressing means on each surface of the process film and the protective film to press the laminate of the process film / polarizer / protective film; And peeling the process film, and a peeling force between the polarizer and the process film is 1.0 N or less.
  • the method of manufacturing a single-sided thin polarizing plate of the present invention may further include forming a protective layer on a surface from which the process film is peeled off after the process film is peeled off.
  • the adhesive composition may be formed using a radical curable composition or a cation curable composition.
  • the protective layer may be formed using a radical curable composition or a cation curable composition.
  • the modulus of the protective layer may be 500MPa to 6000MPa, the thickness may be 0.5 ⁇ m to 10 ⁇ m.
  • the thickness of the process film may be 20 ⁇ m to 100 ⁇ m
  • the width of the process film may be larger than the width of the polarizer.
  • the surface roughness (Ra) of the process film may be 0.5nm to 60nm.
  • the polarizer preferably has a thickness of 50 ⁇ m or less after stretching, and the stretching may be wet stretching or dry stretching, and the stretching ratio may be 4 times or more.
  • the thickness of the single-sided thin polarizing plate manufactured according to the present invention may be 30 ⁇ m to 140 ⁇ m.
  • a thin polarizer having a significantly thin thickness can be manufactured by using a thin polarizer having a thickness of 50 ⁇ m or less, and it is possible to easily prevent contamination from occurring in the manufacturing process, thereby providing excellent workability in the process. There is an advantage.
  • the manufacturing method of the single-sided thin polarizing plate according to the present invention since it can be performed in a continuous process using a roll to roll (roll to roll) process, the production yield is high, very economical.
  • FIG. 1 schematically shows one embodiment of a method of manufacturing a single-sided thin polarizing plate according to the present invention.
  • FIG. 2 schematically shows another embodiment of the method for manufacturing a single-sided thin polarizing plate according to the present invention.
  • the inventors of the present invention have been studied to reduce the breakage rate of the polarizer, and to develop a method for manufacturing a single-sided thin polarizer that prevents contamination of the roll in the pressing process, the result of the polarizer surface without a protective film
  • the present invention was completed by finding out that the above object can be achieved by supplying a process film to the upper part and then performing a pressurization process.
  • the manufacturing method of the single-sided thin polarizing plate comprises the steps of: supplying a process film to one surface of a polarizer having a thickness of 50 ⁇ m or less; Supplying a protective film to the other surface of the polarizer; Supplying an adhesive composition between the polarizer and the protective film to form an adhesive layer; Arranging a pair of pressing means on each surface of the process film and the protective film to press the laminate of the process film / polarizer / protective film; And peeling the process film, wherein the peel force between the polarizer and the process film is 1.0 N or less.
  • the manufacturing method of the single-sided thin polarizer according to the present invention may include a film supply process, a pressing process and a peeling process.
  • a film supply process a pressing process
  • a peeling process a peeling process.
  • the film supplying process includes supplying a process film to one surface of the polarizer having a thickness of 50 ⁇ m or less and supplying a protective film to the other surface of the polarizer. do. More specifically, for example, as shown in FIG. 1, the process film 200 is supplied to one surface of the polarizer 100 made of a polyvinyl alcohol-based resin film having a thickness of 50 ⁇ m or less, and at the same time, It may be performed by a method of supplying the protective film 300.
  • the method of supplying the polarizer 100, the process film 200, and the protective film 300 may be performed using a method well known in the art.
  • the polarizer 100, the process film 200, and the protective film 300 may be supplied in a form in which each film is wound on the rolls 110, 210, and 310.
  • the present invention is not limited thereto.
  • the process film 200 absorbs the pressure applied by the pressing means and acts on the polarizer.
  • the stress can be reduced to effectively reduce the breakage.
  • the pressing means is located directly on the upper surface of the polarizer, there is a problem that the adhesive contaminates the pressing means, that is, the roll in the pressing process.
  • the process film 200 exists on the upper part of the polarizer, the contamination of the pressing means due to the adhesive used when the protective film 300 is adhered to the polarizer 100 is relative. It has the advantage of being less.
  • the feed rate of each of the films may be determined and supplied at an appropriate value for the manufacturing process, and is not particularly limited. Do.
  • the supply direction of the polarizer 100, the process film 200, and the protective film 300 may be supplied in an oblique direction as shown in FIG. 1, but is not limited thereto. Therefore, there may be a portion that is supplied vertically or in parallel.
  • the polarizer 100 may use a thickness of 50 ⁇ m or less, the thickness of the polarizer means the thickness after stretching. That is, in the present invention, the polarizer preferably has a thickness of 50 ⁇ m or less after stretching, more preferably 4 ⁇ m to 30 ⁇ m or 4 ⁇ m to 25 ⁇ m. This is because, when the thickness of the polarizer after stretching satisfies the numerical range, the thinner single-sided thin polarizing plate can be easily manufactured.
  • the polarizer 100 a polyvinyl alcohol-based resin film in which molecular chains containing an iodine compound or a dichroic dye is oriented in a predetermined direction is generally used.
  • the polarizer 100 may be prepared by dyeing an iodine or a dichroic dye in a polyvinyl alcohol-based resin film, and then stretching and crosslinking in a predetermined direction.
  • the stretching process may be performed by wet stretching performed on a solution such as aqueous boric acid solution or iodine solution, or dry stretching performed in the air, and the stretching ratio is 4 times or more, more specifically 4 to 15 times or 4 times.
  • the stretching direction is preferably performed in the longitudinal direction (Machine Direction, MD direction) of the polyvinyl alcohol-based resin film.
  • the degree of polymerization of the polyvinyl alcohol is not particularly limited, but considering the freedom of molecular movement and flexible mixing with the containing material, the polymerization degree is preferably about 1,000 to 10,000, more preferably about 1,500 to 5,000. good.
  • the polarizer 100 may use a commercially available product, for example, products such as Kuraray Co. or Japan Synthetic Co. may be used.
  • the film which can be used as the said process film 200 in this invention will not be specifically limited if the peeling force between the polarizer 100 and the process film 200 is 1.0N or less.
  • the adhesive force between the polarizer and the substrate is at a level of about 1.01N to 4N, when the peeling force between the polarizer and the process film exceeds 1.0N, the process film does not peel well or damages the polarizer in the peeling process described later. There is a problem that can be done.
  • the peel force between a polarizer and a process film means the value measured by the method of peeling 90 degrees at 300 m / min speed using the single-sided polarizing plate of width 20mm and length 100mm.
  • the surface to be peeled off may be an interface between the process film and the PVA-based film or an interface between the process film and the adhesive layer.
  • process film 200 may include at least one selected from the group consisting of polyethylene terephthalate film, polyethylene film, polycarbonate film, triacetylcellulose film, cycloolefin polymer film, and acrylic film. It is not limited. In this case, in the case of using a substrate having a high adhesive strength with a PVA-based film such as an acrylic film as the process film 200, a separate surface in order to satisfy the peel force condition between the polarizer 100 and the process film 200. Processing can be performed.
  • the surface treatment may be performed by a method well known in the art, for example, may be performed by a method such as silicone coating.
  • the thickness of the process film 200 is not particularly limited, but, for example, having a thickness of 20 ⁇ m to 100 ⁇ m or 25 ⁇ m to 75 ⁇ m is preferable in terms of running stability.
  • the film may expand and / or shrink due to heat generated during ultraviolet curing to prevent wrinkles, and ultraviolet rays may well reach the adhesive layer during ultraviolet curing. There is an advantage that can solve the problem of the uncured portion.
  • the width of the process film 200 is preferably larger than the width of the polarizer 100.
  • the width of the process film 200 is greater than the width of the polarizer 100, contamination of the pressing means due to the adhesive may be more effectively reduced.
  • the surface roughness Ra of the process film 200 is, for example, 0.5 nm to 60 nm, 1 nm to 55 nm, or 2 nm to 50 nm.
  • the surface roughness means a fine concavo-convex shape formed on the surface of the process film.
  • the process film has a fine surface irregularities of the same size on the entire surface thereof, the surface area is significantly increased so that adhesion with the polarizer is effectively performed without forming a separate adhesive layer or the like.
  • the process film having a surface roughness value in the range as described above is very advantageous because it can prevent the occurrence of the orange peel (roughness peel) is generated by the irregularities on the surface of the polarizer.
  • the protective film 300 is not particularly limited as long as it is a transparent base film. More specifically, for example, it may include one or more selected from the group consisting of polyethylene terephthalate film, polyethylene film, polycarbonate film, triacetylcellulose film, cycloolefin polymer film and acrylic film, but is not limited thereto. no.
  • the film supply process includes supplying an adhesive composition between the polarizer 100 and the protective film 300 to form an adhesive layer.
  • the step of forming the adhesive layer may be performed by a method of applying the adhesive composition to at least one of the bonding surface of the polarizer 100 and the bonding surface of the protective film 300 in any step of the film supply process.
  • the adhesive composition is apply
  • coats an adhesive composition is not limited to this.
  • a surface activation treatment such as corona treatment, plasma treatment, ultraviolet irradiation treatment, or electron beam irradiation treatment may be performed on the adhesive surface of the protective film 300 to which the adhesive composition is applied, before the adhesive composition is applied.
  • the adhesive composition is for bonding the polarizer 100 and the protective film 300 is not particularly limited as long as it is cured by irradiation of active energy rays. More specifically, for example, it may be a cation-curable composition containing a glycidyl ether epoxy compound, an alicyclic epoxy compound and / or an oxetane compound, or may be a radical curable composition containing an acrylic compound and the like.
  • coating such an adhesive composition will not be specifically limited if a required amount of adhesive composition can be apply
  • the adhesive layer formed as described above may harden the adhesive layer by irradiating the active energy ray using the active energy ray irradiation means 60.
  • the active energy rays include ultraviolet rays, electron beams, microwaves, infrared rays (IR), X-rays and gamma rays, as well as alpha-particle beams, proton beams, and Neutron beams.
  • Particle beams such as neutron beams may be included, and typically ultraviolet rays or electron beams may be used.
  • the amount of light of the active energy ray irradiated on the adhesive layer may be 500mJ / cm 2 to 3000mJ / cm 2
  • the irradiation time may be 0.1s to 20s.
  • the irradiation direction of the active energy ray may be performed on the surface of the process film 200, may be performed on the surface of the protective film 300, the adhesive layer is formed, as shown in Figure 1, may be performed on both sides.
  • the thickness of the adhesive layer cured as described above is preferably 0.1 ⁇ m to 10 ⁇ m, 0.3 ⁇ m to 5 ⁇ m or 0.5 ⁇ m to 4.0 ⁇ m in terms of processability. That is, when the thickness of the adhesive layer is 0.1 ⁇ m or more, the coating property is excellent, and when the thickness is 10 ⁇ m or less, it may have excellent durability.
  • a pair of pressing means is disposed on each surface of the process film 200 and the protective film 300, and the process film 200 / the polarizer 100 / the protective film And pressing the stack of 300. More specifically, for example, as shown in FIG. 1, a pair of pressing means sandwiched between the laminate forming the structure of the process film 200 / the polarizer 100 / the protective film 100 is provided. It can be carried out by the method of pressurizing using. Under the present circumstances, although the said press means is not specifically limited, For example, bonding machines, such as the laminate of roll shape 10 and 20, can be used.
  • the pressing may be performed at, for example, a pressure of 0.5 MPa to 6 MPa or 1 MPa to 5 MPa.
  • the peeling process may include the step of peeling the process film 200, for example, as shown in FIG. 1, the process film peeled off by peeling the process film 200 ( At the same time as the 200 wound on the film winding roll 220, it may be performed by a method of winding the formed one-sided thin polarizing plate on the polarizing plate winding roll 400.
  • the manufacturing method of the present invention after the step of peeling the process film 200 to form a protective layer on the surface on which the process film 200 is peeled off It may further include.
  • the protective layer is formed as described above, the polarizer 100 may be prevented from being discolored even in a moisture resistant environment, and the protective layer protects the shrinkage stress of the polarizer in a thermal shock environment to prevent cracks in the polarizer. Since it is possible, the single-sided thin polarizing plate according to the present invention has an advantage of ensuring excellent water resistance and thermal shock resistance.
  • the forming of the protective layer may be performed by applying a composition for forming a protective layer on one surface of the polarizer 100 and then drying and / or curing the protective layer.
  • a protective layer can be formed by apply
  • the application means 70 which apply
  • the protective layer formed as described above may harden the adhesive layer by irradiating the active energy ray using the active energy ray irradiation means 80.
  • the type, the light amount, the irradiation time and the irradiation direction of the active energy ray is the same as described above in the step of forming the adhesive layer.
  • the thickness of the protective layer cured in the above manner may be, for example, 0.5 ⁇ m to 10 ⁇ m or 0.5 ⁇ m to 7 ⁇ m.
  • the modulus of the protective film and the protective layer is designed to be larger than the shrinkage stress of the polarizer.
  • the modulus of the protective layer depends on the thickness of the protective layer.
  • the composition for forming the protective layer is not particularly limited, but considering the process convenience, it is preferable that the composition is cured by active energy ray cured by irradiation of active energy rays. More specifically, the protective layer-forming composition is, for example, a cation-curable composition containing a glycidyl ether epoxy compound, an alicyclic epoxy compound and / or an oxetane compound, or a radical containing an acrylic compound or the like. It may be a curable composition.
  • the modulus of the protective layer may be, for example, 500MPa to 6000MPa, 1000MPa to 5500MPa or 1500MPa to 5000MPa at 70 °C.
  • the modulus of the protective layer has such a value, it is because it is possible to ensure the heat resistance and thermal shock characteristics of the polarizing plate.
  • the modulus is a value obtained by measuring a change in frequency response according to stress applied using a DMA (dynamic mechanical analyzer) device of TA Instrument.
  • the glass transition temperature (Tg) of the protective layer may be, for example, 70 °C to 300 °C.
  • the single-sided thin polarizing plate having the protective layer formed thereon may be wound on the polarizing plate winding roll 500 to be manufactured in a roll form.
  • the thickness of the single-sided thin polarizing plate manufactured according to the present invention may be, for example, 30 ⁇ m to 140 ⁇ m, 30 ⁇ m to 130 ⁇ m, or 30 ⁇ m to 120 ⁇ m.
  • a thin polarizing plate having a significantly thin thickness can be manufactured using a thin polarizer having a thickness of 50 ⁇ m or less, and it is known that contamination occurs in the manufacturing process. It can be easily prevented and the workability is excellent. In addition, it can be carried out in a continuous process using a roll to roll (roll to roll) process, the production yield is high, there is a very economic advantage.
  • the polyvinyl alcohol film manufactured by Nippon Synthetic
  • the upper surface had a thickness of 38 ⁇ m with a process film, and a peeling force with a polarizer.
  • the UV curable adhesive composition was applied between the polyvinyl alcohol-based film and the protective film to a thickness of 2 ⁇ m using a Mayer bar. Thereafter, 500 mJ / cm 2 ultraviolet rays were irradiated and cured by using an arc lamp, and the process film was peeled off to prepare a single-sided thin polarizing plate having an acrylic film attached to only one side of the polyvinyl alcohol-based film as a protective film.
  • Example 1 After peeling off a protective film, the same composition as the ultraviolet curable adhesive composition was apply
  • a polyvinyl alcohol film (manufactured by Nippon Synthetic Co., Ltd.) having a thickness of 20 ⁇ m was moved in a horizontal direction at a speed of 10 M / min under an atmosphere of 25 ° C., while an acrylic film (manufactured by Nippon Catalyst Co., Ltd.) was supplied as a protective film to one surface thereof. A pair of rolls was passed at 10 M / min speed and 2 MPa pressure. At this time, the UV curable adhesive composition was applied between the polyvinyl alcohol-based film and the protective film to a thickness of 2 ⁇ m using a Mayer bar.
  • a single-sided thin polarizing plate was produced in the same manner as in Example 1 except that a PET film having a peeling force of 3N with a polarizer was used as the process film.
  • a single-sided thin polarizing plate was manufactured in the same manner as in Example 1 except that a PET film having a surface roughness (Ra) of 65 nm was used as the process film.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une lame polarisante mince unilatérale. Le procédé comprend les étapes consistant à : fournir un film de traitement sur un côté d'un polariseur possédant une épaisseur inférieure ou égale à 50 µm ; fournir un film de protection sur l'autre côté du polariseur ; former une couche adhésive par l'apport d'une composition adhésive entre le polariseur et le film de protection ; agencer une paire de moyens de pression sur chaque surface du film de traitement et du film de protection, puis appuyer un stratifié sur le film de traitement/le polariseur/le film de protection ; et décoller le film de traitement, la force de décollement entre le polariseur et le film de traitement étant inférieure ou égale à 1,0 N.
PCT/KR2014/008067 2013-09-30 2014-08-29 Procédé de fabrication de lame polarisante mince unilatérale WO2015046765A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP14848615.2A EP3054328B1 (fr) 2013-09-30 2014-08-29 Procédé de fabrication de lame polarisante mince unilatérale
US15/024,561 US10029449B2 (en) 2013-09-30 2014-08-29 Method for manufacturing one-sided thin polarizing plate
JP2016545670A JP2016540259A (ja) 2013-09-30 2014-08-29 片面型薄型偏光板の製造方法
CN201480053839.XA CN105593718B (zh) 2013-09-30 2014-08-29 用于制造单面薄偏光板的方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2013-0117047 2013-09-30
KR20130117047 2013-09-30
KR10-2014-0112653 2014-08-27
KR1020140112653A KR101614211B1 (ko) 2013-09-30 2014-08-27 편면형 박형 편광판의 제조방법

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017072855A (ja) * 2015-02-14 2017-04-13 三菱樹脂株式会社 偏光板製造工程用ポリエステルフィルムの製造方法
JP6148775B1 (ja) * 2016-02-25 2017-06-14 住友化学株式会社 積層光学フィルムの製造方法
JP6306675B1 (ja) * 2016-11-28 2018-04-04 住友化学株式会社 プロテクトフィルム付偏光性積層フィルムの製造方法及び偏光板の製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5302459A (en) * 1991-08-01 1994-04-12 Cheil Synthetics Inc. Method for preparation of polyester films with good release and slip properties
KR20000019274A (ko) * 1998-09-10 2000-04-06 이영관 폴리에스테르 이형필름의 제조방법
JP2000338329A (ja) * 1999-06-01 2000-12-08 Sanritsutsu:Kk 偏光板及びその製造方法
JP2007292872A (ja) * 2006-04-21 2007-11-08 Okura Ind Co Ltd 偏光板の製造方法
JP2011081399A (ja) * 2010-11-11 2011-04-21 Sumitomo Chemical Co Ltd 偏光板の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5302459A (en) * 1991-08-01 1994-04-12 Cheil Synthetics Inc. Method for preparation of polyester films with good release and slip properties
KR20000019274A (ko) * 1998-09-10 2000-04-06 이영관 폴리에스테르 이형필름의 제조방법
JP2000338329A (ja) * 1999-06-01 2000-12-08 Sanritsutsu:Kk 偏光板及びその製造方法
JP2007292872A (ja) * 2006-04-21 2007-11-08 Okura Ind Co Ltd 偏光板の製造方法
JP2011081399A (ja) * 2010-11-11 2011-04-21 Sumitomo Chemical Co Ltd 偏光板の製造方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017072855A (ja) * 2015-02-14 2017-04-13 三菱樹脂株式会社 偏光板製造工程用ポリエステルフィルムの製造方法
JP6148775B1 (ja) * 2016-02-25 2017-06-14 住友化学株式会社 積層光学フィルムの製造方法
JP2017151406A (ja) * 2016-02-25 2017-08-31 住友化学株式会社 積層光学フィルムの製造方法
JP6306675B1 (ja) * 2016-11-28 2018-04-04 住友化学株式会社 プロテクトフィルム付偏光性積層フィルムの製造方法及び偏光板の製造方法
CN108121027A (zh) * 2016-11-28 2018-06-05 住友化学株式会社 带保护膜的偏振性层叠膜的制造方法和偏振板的制造方法
JP2018087861A (ja) * 2016-11-28 2018-06-07 住友化学株式会社 プロテクトフィルム付偏光性積層フィルムの製造方法及び偏光板の製造方法

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