WO2016063668A1 - Rouleau de plaque de polarisation - Google Patents

Rouleau de plaque de polarisation Download PDF

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Publication number
WO2016063668A1
WO2016063668A1 PCT/JP2015/076632 JP2015076632W WO2016063668A1 WO 2016063668 A1 WO2016063668 A1 WO 2016063668A1 JP 2015076632 W JP2015076632 W JP 2015076632W WO 2016063668 A1 WO2016063668 A1 WO 2016063668A1
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WIPO (PCT)
Prior art keywords
polarizing plate
core
convex portion
polarizer
film
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PCT/JP2015/076632
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English (en)
Japanese (ja)
Inventor
裕一 塩田
Original Assignee
住友化学株式会社
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Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020177013496A priority Critical patent/KR102291844B1/ko
Priority to CN201580057075.6A priority patent/CN107076915B/zh
Publication of WO2016063668A1 publication Critical patent/WO2016063668A1/fr

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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
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/04—Kinds or types
    • B65H75/08—Kinds or types of circular or polygonal cross-section
    • B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering

Definitions

  • the present invention relates to a polarizing plate roll formed by winding a long polarizing plate around a winding core.
  • the polarizing plate has been widely used in display devices such as liquid crystal display devices, especially in recent years for various mobile devices such as smartphones.
  • As a polarizing plate one having a configuration in which a protective film is bonded to one side or both sides of a polarizer is common, but with the development to mobile devices, the polarizer and protective film constituting the polarizing plate are made thinner. It is increasingly demanded.
  • the polarizing plate is manufactured by using a long (band-shaped) raw material film and processing the unwound raw material film while unwinding the raw material film from a roll in which the raw material film is wound around a winding core (winding core). It is common to use a so-called roll-to-roll method in which a long (band-like) polarizing plate is used, and the obtained polarizing plate is wound around a core to make a roll. Accordingly, the polarizing plate is usually obtained as a polarizing plate roll obtained by winding a long polarizing plate around a core (for example, Japanese Patent Application Laid-Open No. 2013-029754 (Patent Document 1)).
  • the polarizing plate is generally manufactured in the form of a polarizing plate roll.
  • the film length of the polarizing plate is 2000 m and the diameter of the core is 150 mm ⁇ , the number of windings of the polarizing plate reaches about 4000 times.
  • the polarizing plate manufactured as a polarizing plate roll is used for subsequent processes such as further laminating another film or forming a coating layer, or while being transported to a supply destination. It is often held in a roll for a certain continuous period.
  • the polarizing plate unwound after being held in a roll state for a certain continuous period has a problem that it is easily accompanied by deformation called “sagging” at both ends in the width direction. This problem becomes more prominent as the polarizer and the protective film constituting the polarizing plate are thinner. “Looseness” is wavy deformation (deflection) that occurs at both ends of the polarizing plate in the width direction. When this slackness is greatly spread from the end in the width direction to the inner side (center side) of the polarizing plate, the polarizing plate is used when another film is bonded or a coating layer is formed in the post-process. In other words, wrinkles are easily generated or bubbles are easily caught, resulting in a decrease in the quality of the product, and in some cases, it is difficult to perform the post-process itself.
  • the present invention is a polarizing plate roll formed by winding a polarizing plate around a winding core, which can be confirmed when the polarizing plate is unwound from the roll, and “sagging” occurring at both ends in the width direction of the polarizing plate. It aims at providing the polarizing plate roll which can suppress this.
  • the film thickness distribution of the polarizer contained in the polarizing plate is the main cause of slackness. That is, a polarizer is usually manufactured through a process of stretching a strip-shaped resin film or the like as a raw material in a longitudinal direction (film longitudinal direction) or a lateral direction (film width direction), so that both ends are compared with the central portion in the width direction. The thickness of the part is large. A polarizing plate provided with a polarizer having such a film thickness distribution also has a film thickness distribution having the same tendency. When the polarizing plate is wound around a winding core, the width direction end region of the stacked polarizing plates is reduced.
  • the polarizing plate Since the polarizing plate is further wound in the state where the overall thickness is increased, the circumferential stress is increased in both end regions of the wound polarizing plate, and the both end regions are stretched. It will be wound in a state. This is the main cause of slackness.
  • the present invention provides the following polarizing plate roll as means for solving the above problems.
  • a core including a first convex portion and a second convex portion extending in the circumferential direction on the outer peripheral surface, and a polarizing plate wound around the core,
  • the polarizing plate comprises a polarizer and a protective film laminated on at least one surface thereof, The polarizing plate is wound around the core so that one end in the width direction of the polarizer is positioned on the first convex portion and the other end is positioned on the second convex portion.
  • a polarizing plate roll.
  • a polarizing plate roll capable of suppressing slackening at both ends in the width direction of the polarizing plate. By suppressing the slack, it is possible to improve the quality of the polarizing plate itself and the product obtained by the post-process as described above, the yield of the product, and the ease of performing the post-process.
  • FIG. 1 shows the 1st convex part of the core with a convex part shown by FIG.
  • FIG. shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows typically the positional relationship regarding the width direction between the convex part of the core with a convex
  • the polarizing plate roll according to the present invention has a convex winding having a first convex portion 10 a and a second convex portion 10 b extending in the circumferential direction as a winding core on the outer peripheral surface.
  • This is a roll-type polarizing plate in which a core 10 is used and a long polarizing plate is wound around the core 10.
  • the polarizing plate in order to suppress the occurrence of the above-mentioned “sag”, has one end in the width direction of the polarizer constituting the polarizing plate positioned on the first convex portion 10a and the other end.
  • the slack is suppressed by winding the polarizing plate in the above positional relationship, with respect to the width direction of the polarizing plate, both ends of the thickest polarizer are placed on the convex portion of the core 10 with the convex portion. This is because the above-described circumferential stress in the both end regions of the wound polarizing plate is relaxed.
  • the degree of slack (length) generally reaches the maximum when the number of turns from the beginning of winding is about 70 to 75 times (depending on the diameter of the core). However, in terms of the distance (winding length) from the winding start end, it is around 30 to 40 m). As the number of windings increases, the degree of looseness gradually decreases.
  • the degree of slack (length) here refers to the length of the wavy deformation extending from the width direction end of the polarizing plate to the inner side of the polarizing plate (center side).
  • the core 10 with convex part can have the same shape as a conventionally well-known core except having the 1st convex part 10a and the 2nd convex part 10b, These
  • the main body portion of the core excluding the convex portion can be, for example, a columnar shape or a cylindrical shape.
  • the material is not particularly limited, and a metal, an alloy, or a resin (such as a thermoplastic resin) can be used.
  • the length in the width direction (rotation axis direction) of the core 10 with the convex portion is approximately the same as or longer than the width of the polarizing plate to be wound.
  • the diameter may be a general diameter of the core, for example, about 100 to 200 mm ⁇ .
  • the installation position of the 1st convex part 10a and the 2nd convex part 10b provided in the outer peripheral surface of the core 10 with a convex part is dependent on the width
  • the first convex portion 10a and the second convex portion 10b are positions different from each other on the outer peripheral surface, and one end portion in the width direction of the polarizer constituting the polarizing plate is the first convex portion. It is located on the part 10a and installed so that the other end is located on the second convex part 10b.
  • the 1st convex part 10a and the 2nd convex part 10b are the edge part area
  • the 1st convex part 10a and the 2nd convex part 10b are provided in the outer peripheral surface of the core 10 with a convex part so that it may extend in the circumferential direction of the core 10 with a convex part, Preferably the circumference
  • the first convex portion 10 a and the second convex portion 10 b are preferably strip-shaped, and are provided in an annular shape over the entire circumference or approximately the entire circumference of the outer peripheral surface of the core 10 with the convex portion. It is preferable.
  • the 1st convex part 10a and the 2nd convex part 10b may be shape
  • the 1st convex part 10a and the 2nd convex part 10b are provided in the outer peripheral surface of the columnar or cylindrical core as a main-body part of the core 10 with a convex part.
  • the method of sticking the resin film to form (for example, a film tape from a thermoplastic resin) can be mentioned. This resin film may have an adhesive layer on one side for sticking to the outer peripheral surface of the core.
  • the method of sticking the resin film using an adhesive it is possible to reattach the film, so that the position adjustment or position change of the convex portion is facilitated.
  • the method of forming the convex portion by sticking the resin film is advantageous in terms of the manufacturing cost of the convex core 10 and the simplicity of manufacturing, and the convex core 10 having sufficient strength is provided. Obtainable.
  • the resin film may be attached to the outer peripheral surface of the core using an adhesive.
  • the polarizing plate wound around the convex core 10 includes a polarizer and a protective film laminated on at least one surface thereof.
  • the protective film may be laminated
  • the protective film is usually bonded to the polarizer via an adhesive layer.
  • an active energy ray-curable adhesive such as an ultraviolet curable adhesive or a water-based adhesive such as a polyvinyl alcohol resin aqueous solution can be used.
  • the total thickness of the polarizing plate is generally about 30 to 300 ⁇ m.
  • a uniaxially stretched resin film having a dichroic dye adsorbed and oriented can be suitably used.
  • An example of the resin film is a polyvinyl alcohol resin film.
  • the dichroic dye iodine or a dichroic dye can be used.
  • the polyvinyl alcohol resin constituting the polarizer a saponified polyvinyl acetate resin can be used.
  • the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
  • Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids and (meth) acrylamides having ammonium groups.
  • (meth) acryl means at least one selected from acryl and methacryl. The same applies to “(meth) acryloyl”.
  • the degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
  • the polyvinyl alcohol resin may be modified, and for example, polyvinyl formal and polyvinyl acetal modified with aldehydes may be used.
  • the degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10,000, and preferably about 1500 to 5,000.
  • the polarizer is a step of uniaxially stretching (typically, longitudinally uniaxially stretching in the longitudinal direction of the film) the original film made of the polyvinyl alcohol resin, and the polyvinyl alcohol resin film is dyed with a dichroic dye. It can be produced by a method including a step of adsorbing a chromatic dye, a step of treating a polyvinyl alcohol resin film adsorbed with a dichroic dye with a boric acid aqueous solution, and a step of washing with water after the treatment with the boric acid aqueous solution. You may provide the swelling process which performs the immersion process to water before a dyeing
  • the uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, simultaneously with, or after the dyeing of the dichroic dye.
  • this uniaxial stretching may be performed before boric acid treatment or during boric acid treatment. Moreover, you may uniaxially stretch in these several steps.
  • the thickness (average thickness over the entire width) of the polarizer is, for example, 40 ⁇ m or less, preferably 25 ⁇ m or less. Particularly in a polarizing plate for mobile devices, it is more preferably 10 ⁇ m or less from the viewpoint of thinning the polarizing plate. preferable.
  • the thickness of the polarizer is usually 2 ⁇ m or more. Even when such a thin film polarizer is used, according to the present invention, it is possible to effectively suppress slack.
  • a polarizer is usually manufactured through a process of stretching a polyvinyl alcohol-based resin film in the longitudinal direction (film longitudinal direction), a film thickness distribution in which both end portions are thicker than the center portion in the width direction.
  • the polarizing plate also usually has the same thickness distribution.
  • the thickness of both end portions in the width direction of the polarizing plate can be about 1.01 to 1.2 times the thickness of the center portion in the width direction, about 1.04 to 1.2 times, and further 1.1 to 1 It may be about twice as large. Even if it has such a large film thickness difference, according to the present invention, it is possible to effectively suppress slack.
  • the protective film to be bonded to the polarizer is a light-transmitting (preferably optically transparent) thermoplastic resin such as a chain polyolefin resin (polypropylene resin, etc.), a cyclic polyolefin resin (norbornene-based).
  • Polyolefin resins such as resin); cellulose ester resins such as cellulose triacetate and cellulose diacetate; polyester resins; polycarbonate resins; (meth) acrylic resins; polystyrene resins; or a mixture or copolymer thereof. It can be a film made of an object or the like.
  • these may be protective films made of the same kind of resin or may be protective films made of different kinds of resins.
  • the protective film may be a protective film having both optical functions such as a retardation film and a brightness enhancement film.
  • a retardation film provided with an arbitrary retardation value by stretching a film made of the thermoplastic resin (uniaxial stretching or biaxial stretching) or by forming a liquid crystal layer or the like on the film. It can be.
  • chain polyolefin resin examples include a homopolymer of a chain olefin such as a polyethylene resin and a polypropylene resin, and a copolymer composed of two or more chain olefins.
  • Cyclic polyolefin-based resin is a general term for resins that are polymerized using cyclic olefins as polymerization units.
  • Specific examples of cyclic polyolefin resins include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins and chain olefins such as ethylene and propylene (typically Are random copolymers), graft polymers obtained by modifying them with unsaturated carboxylic acids or derivatives thereof, and hydrides thereof.
  • norbornene resins using norbornene monomers such as norbornene and polycyclic norbornene monomers as cyclic olefins are preferably used.
  • the cellulose ester resin is an ester of cellulose and a fatty acid.
  • Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate.
  • these copolymers and those in which a part of the hydroxyl group is modified with other substituents can also be used.
  • cellulose triacetate triacetyl cellulose: TAC is particularly preferable.
  • the polyester-based resin is a resin other than the cellulose ester-based resin having an ester bond, and is generally made of a polycondensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol.
  • a dicarboxylic acid or a derivative thereof can be used, and examples thereof include terephthalic acid, isophthalic acid, dimethyl terephthalate, and dimethyl naphthalenedicarboxylate.
  • a diol can be used as the polyhydric alcohol, and examples thereof include ethylene glycol, propanediol, butanediol, neopentyl glycol, and cyclohexanedimethanol.
  • polyester resin examples include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethyl terephthalate, and polycyclohexanedimethyl naphthalate.
  • Polycarbonate resin is made of a polymer in which monomer units are bonded via a carbonate group.
  • the polycarbonate-based resin may be a resin called a modified polycarbonate having a modified polymer skeleton, a copolymer polycarbonate, or the like.
  • the (meth) acrylic resin is a resin containing a compound having a (meth) acryloyl group as a main constituent monomer.
  • Specific examples of the (meth) acrylic resin include, for example, poly (meth) acrylic acid esters such as polymethyl methacrylate; methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylic acid Ester copolymer; methyl methacrylate-acrylate ester- (meth) acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (MS resin, etc.); methyl methacrylate and alicyclic hydrocarbon group And a copolymer with the compound (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate- (meth) acrylate norbornyl copolymer, etc.).
  • a polymer based on a poly (meth) acrylic acid C 1-6 alkyl ester such as poly (meth) acrylic acid methyl is used, and more preferably methyl methacrylate is used as a main component (50 to 100). % Methyl methacrylate-based resin is used.
  • the thickness of the protective film is preferably 90 ⁇ m or less, more preferably 50 ⁇ m or less, and even more preferably 30 ⁇ m or less, from the viewpoint of thinning the polarizing plate.
  • the thickness of the protective film is usually 5 ⁇ m or more from the viewpoint of strength and handleability. Even when such a thin protective film is used, according to the present invention, the slack can be effectively suppressed.
  • a protective film having a higher moisture permeability is used, the slack is likely to occur. This is considered to be because a film having a large moisture permeability is likely to change in dimensions.
  • a protective film / polarizer / TAC protective film made of TAC rather than a polarizing plate having a protective film / polarizer / TAC protective film made of a cyclic polyolefin resin or a (meth) acrylic resin, a protective film / polarizer / TAC protective film made of TAC.
  • the polarizing plate is more likely to sag. Therefore, the present invention is particularly advantageous when a polarizing plate including a protective film having a high moisture permeability such as TAC is handled.
  • the polarizing plate may include a film or layer other than the protective film.
  • films and layers other than the protective film include: an adhesive layer; a separate film that protects the outer surface of the adhesive layer (release film); a protective film that protects the surface of the protective film (surface protective film); Surface treatment layer (coating layer) for imparting functions; including various optical functional films.
  • a conventionally known appropriate pressure-sensitive adhesive can be used.
  • a (meth) acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, and a polyamide-based pressure-sensitive adhesive examples thereof include an adhesive, a polyether-based adhesive, a fluorine-based adhesive, and a rubber-based adhesive.
  • a (meth) acrylic pressure-sensitive adhesive is preferably used from the viewpoints of transparency, adhesive strength, reliability, reworkability, and the like.
  • the thickness of the pressure-sensitive adhesive layer can be generally 1 to 40 ⁇ m (for example, 3 to 25 ⁇ m).
  • the constituent material of the separate film can be a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, and the like. Among these, a stretched film of polyethylene terephthalate is preferable.
  • constituent material of the protective film examples include polyethylene resins such as polyethylene, polypropylene resins such as polypropylene, and polyester resins such as polyethylene terephthalate. Among them, from the viewpoint of moisture permeability and mechanical strength A stretched film of polyethylene terephthalate is preferred.
  • Examples of the surface treatment layer include a hard coat layer, an antiglare layer, an antireflection layer, an antistatic layer, and an antifouling layer.
  • a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light that shows the opposite property
  • a film with an antiglare function having an uneven shape on the surface
  • a film with a surface antireflection function examples thereof include a reflective film having a reflective function on the surface; a transflective film having both a reflective function and a transmissive function; and a viewing angle compensation film.
  • the width of the polarizing plate wound around the convex core 10 is not particularly limited, but is usually about 300 to 2500 mm, and more typically about 500 to 2000 mm.
  • the length of the polarizing plate is not particularly limited, but is usually about several hundred m to 3000 m (for example, about 2000 m), and more typically about 1500 to 2500 m.
  • variety of the protective film bonded to this may be the same or different, the width
  • FIG. 3 shows the convex part of the core 10 with convex part and the polarizing plate 20 to be wound. It is sectional drawing which shows typically the positional relationship regarding the width direction between.
  • the polarizing plate 20 comprised from the polarizer 21 and the 1st protective film 22 bonded on the one surface and the 2nd protective film 23 bonded on the other surface is used as an example.
  • the layer configuration of the polarizing plate is not limited to this as described above.
  • FIG. 3 shows only the first convex portion 10a of the core 10 with convex portions, but the contents described below are similarly applied to the positional relationship with the second convex portion 10b.
  • the polarizing plate 20 has one end portion (end surface, T 1 in FIG. 3) in the width direction of the polarizer 21 located on the first convex portion 10a, which is not shown in FIG. However, it winds around the core 10 with a convex part so that the other edge part (end surface) may be located on the 2nd convex part 10b.
  • the end (end face) T 1 of the polarizer 21 is positioned on the first convex portion 10a. Referring to FIG. 3, the end T 1 of the polarizer 21 is the outer end T 2 of the first convex portion 10a. And the inner end T 3 (including the case where T 1 matches T 2 or T 3 ).
  • the end portion T 1 of the polarizer 21 is positioned outside the outer end portion (end surface) T 2 of the first convex portion 10a, or inside the inner end portion (end surface) T 3 of the first convex portion 10a. In the case of being positioned, it is not possible to sufficiently obtain a slack suppressing effect.
  • the end portion T 1 of the polarizer 21 is located outside the inner end portion T 3 of the first convex portion 10a.
  • the width W 2 (the overlapping width of the polarizer 21 and the first convex portion 10a) of the end region (region including the end portion T 1 ) of the polarizer 21 positioned (ridden) on the first convex portion 10a is as follows. 5 mm or more is preferable, and 10 mm or more is more preferable. Referring to FIG. 3, the overlap width W 2 corresponds to the distance from the end T 1 of the polarizer 21 to the inner end T 3 of the first convex portion 10a. If the overlap width W 2 is too small, it is difficult to obtain a sufficient slack suppressing effect.
  • the upper limit of the overlap width W 2 is not particularly limited, but can be about 30 mm, for example.
  • the width W 1 of the first convex portion 10a is preferably 5 mm or more so that the preferable overlapping width W 2 is obtained.
  • the upper limit of the width W 1 is not particularly limited, and is 100 mm, for example.
  • the position of the end T 1 of the polarizer 21 and the position of the outer end T 2 of the first convex portion 10a are matched or approximately matched (W 1 and W 2 are the same or approximately equal to each other). The same), and the end region of the polarizer 21 may be overlapped (mounted) over the entire width or almost the entire width of the first convex portion 10a.
  • the height H of the first convex portion 10a is preferably 50 ⁇ m or more, more preferably 120 ⁇ m or more, and 500 ⁇ m or more. More preferably it is. As the height H is larger, the slack suppression effect tends to be higher.
  • the upper limit of the height H can be 1500 ⁇ m (for example, 1000 ⁇ m).
  • FIG. Figure 4 is an example of forming a first convex portion 10a by superimposing winding the second resin film t 2 on the first resin film t 1.
  • the width of the protective film is made larger, and the protective film is generally pasted so that both ends in the width direction of the protective film are located outside the both ends in the width direction of the polarizer.
  • the protrusion width W 3 of the first protective film 22 and the second protective film 23 is: It can be about 1 to 100 mm (for example, about 5 to 60 mm).
  • the polarizing plate 20 is wound by rotating the winding core 10 with the convex portion around its rotation axis.
  • the fixing member 30 is used [FIG. 5 (a)]
  • the winding start end (longitudinal direction start end) of the polarizing plate 20 is provided with a convex portion. It is preferable to fix to the outer peripheral surface of the winding core 10 [FIG.5 (b)]. Since the polarizing plate 20 can be easily fixed, a double-sided tape can be preferably used as the fixing member 30.
  • a fixing member 30 that is a double-sided tape is attached to the outer peripheral surface of the core 10 with a convex portion parallel to the rotation axis of the core 10 with a convex portion, and the winding start end of the polarizing plate 20 is polarized on the fixing member 30. It sticks so that the short side direction of the board 20 may become parallel to the rotating shaft of the core 10 with a convex part.
  • winding streak defect means a difference in height generated between the winding start end and / or fixing member of the polarizing plate fixed on the fixing member and the outer peripheral surface of the core, that is, a step portion.
  • streak-like dent defect extending in the width direction of the polarizing plate, which is generated by pressing the wound polarizing plate.
  • a defect K 1 (defect generated by being pressed against the corner at the winding start end of the polarizing plate) derived from the corner at the winding start end of the polarizing plate (short side corner of the end), and
  • a defect K 2 (defect generated by being pressed against the corner of the fixing member) derived from the corner of the fixing member such as a double-sided tape (FIG. 6).
  • Winding streak defects are strongly generated in the polarizing plate inside the polarizing plate roll (initial polarizing plate at the start of winding), and become weaker toward the outer side of the polarizing plate roll. can occur over m.
  • a polarizing plate containing winding stripe defects is applied to an image display device such as a liquid crystal display device, the visibility may be lowered.
  • the polarizing plate roll according to the present invention is advantageous for suppressing such winding streak defects.
  • the smaller the height H of the convex portion the higher the effect of suppressing winding streak defects. Therefore, when it is desired to obtain a winding streak defect suppressing effect while obtaining a sufficient slack suppressing effect, the height H is preferably less than 500 ⁇ m, and preferably 400 ⁇ m or less. In order to obtain the effect of suppressing winding streak defects, the height H is preferably 50 ⁇ m or more (for example, 100 ⁇ m or more).
  • a long polarizing plate having a layer structure of a protective film [thickness 40 ⁇ m] / protective film [thickness 62 ⁇ m] made of an agent layer / TAC and a stretched polyethylene phthalate is continuously produced by a roll-to-roll method. Then, it was wound around a cylindrical core (no protrusion) to obtain a polarizing plate roll.
  • TAC triacetylcellulose
  • the specific conditions for producing the polarizing plate roll are as follows.
  • the winding start end (longitudinal direction start end) of the polarizing plate was fixed to the outer peripheral surface of the core using a double-sided tape having a thickness of 176 ⁇ m.
  • Cylindrical core (no protrusion) ⁇ Material: FRP (fiber reinforced plastic), ⁇ Width direction (rotating axis direction) length: 1480 mm, ⁇ Diameter: 167mm ⁇ , [2] Polarizing plate Width of protective film: 1330 mm, -Polarizer width: 1270 mm, - Figure 3 in W 3: 30 mm (both ends), -Polarizing plate length: about 2000m -Tension at the time of winding a polarizing plate: 250N.
  • Example 1 A polarizing plate roll was produced in the same manner as in Comparative Example 1 except that the same core with projections as in FIG. 1 was used and the specific conditions for producing the polarizing plate roll were as follows.
  • the polarizing plate was wound so that one end portion in the width direction of the polarizer was positioned on the first convex portion and the other end portion was positioned on the second convex portion.
  • the fixed-width resin film tape which has an adhesive layer on one side is stuck on the outer peripheral surface of a core main-body part over substantially the whole circumference like FIG. Formed by.
  • Example 2 A polarizing plate roll was produced in the same manner as in Example 1 except that the height of the first and second protrusions (H in FIG. 3) was 360 ⁇ m.
  • Example 3 A polarizing plate roll was produced in the same manner as in Example 1 except that the height of the first and second protrusions (H in FIG. 3) was 180 ⁇ m.
  • Example 4 A polarizing plate roll was produced in the same manner as in Example 1 except that the overlapping width (W 2 in FIG. 3) between the polarizer and the first and second convex portions was 2 mm.
  • Example 5 A polarizing plate roll was produced in the same manner as in Example 2 except that the first protective film was changed from the TAC film to a cyclic polyolefin resin (COP) film having a thickness of 20 ⁇ m.
  • COP cyclic polyolefin resin
  • ⁇ Comparative example 2> The overlapping width (W 2 in FIG. 3) between the polarizer and the first and second convex portions is 0 mm, that is, the end portion T 1 of the polarizer is the inner end portion T 3 of the first and second convex portions.
  • a polarizing plate roll was produced in the same manner as in Example 1 except that the polarizing plate was wound so as to be located on the inner side.
  • Table 1 summarizes the main production conditions for polarizing plate rolls in Examples 1 to 5 and Comparative Examples 1 and 2.
  • the produced polarizing plate roll was stored for 15 days in an environment of 25 ° C. and 50% RH, and then the following items were evaluated. The results are shown in Table 1.
  • the polarizing plate roll after the storage was unwound and the degree of slackness (length) was measured and evaluated according to the following criteria.
  • the degree of slack (length) is the length of slack (wave-like deformation) extending from the end of the polarizing plate in the width direction to the inside (center side) of the polarizing plate (more precisely, the protective film).
  • the degree of looseness was maximum at a point where the number of windings was 70 to 75 from the start of winding.
  • A The maximum value of the length of slack is less than 60 mm.
  • B The maximum value of the length of slack is 60 mm or more and less than 120 mm,
  • C The maximum value of the length of slack is 120 mm or more.
  • A The length by which a strong winding streak defect is observed visually is less than 10 m.
  • B The length at which a strong winding streak defect is observed visually is 10 m or more and less than 15 m.
  • C The length by which a strong winding streak defect is visually observed is 15 m or more.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)

Abstract

L'invention concerne un rouleau de plaque de polarisation comprenant : un noyau d'enroulement qui comporte une surface circonférentielle extérieure pourvue d'une première saillie et d'une seconde saillie qui s'étendent dans la direction circonférentielle ; et une plaque de polarisation qui est enroulée autour du noyau d'enroulement. La plaque de polarisation est pourvue d'un polariseur et d'un film de protection qui est stratifié sur au moins une surface du polariseur, et est enroulée autour du noyau d'enroulement de sorte qu'une partie d'extrémité du polariseur dans la direction de la largeur soit positionnée au-dessus de la première saillie et que l'autre partie d'extrémité soit positionnée au-dessus de la seconde saillie.
PCT/JP2015/076632 2014-10-24 2015-09-18 Rouleau de plaque de polarisation WO2016063668A1 (fr)

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JP2014217180A JP6502059B2 (ja) 2014-10-24 2014-10-24 偏光板ロール
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CN107436459A (zh) * 2016-05-26 2017-12-05 住友化学株式会社 偏振板和液晶显示装置

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JP7203486B2 (ja) * 2017-03-03 2023-01-13 住友化学株式会社 光学フィルム原反ロールの製造方法、および光学部材シートの製造方法
TWI676554B (zh) * 2017-06-19 2019-11-11 住華科技股份有限公司 接合膠帶、應用其之保護片及偏光板
JP6787974B2 (ja) * 2018-11-06 2020-11-18 住友化学株式会社 偏光板、画像表示装置及び偏光板の製造方法

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JP2008197223A (ja) * 2007-02-09 2008-08-28 Nippon Zeon Co Ltd 光学素子、偏光板、位相差板、照明装置、および液晶表示装置
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JP6055171B2 (ja) 2011-07-29 2016-12-27 住友化学株式会社 偏光板ロールおよびその製造方法
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WO2012035837A1 (fr) * 2010-09-17 2012-03-22 コニカミノルタオプト株式会社 Procédé et système de production d'un dispositif d'affichage optique
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KR20170072923A (ko) 2017-06-27
TWI665476B (zh) 2019-07-11
KR102291844B1 (ko) 2021-08-23
CN107076915A (zh) 2017-08-18
CN107076915B (zh) 2019-12-24
JP6502059B2 (ja) 2019-04-17
TW201625995A (zh) 2016-07-16

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