WO2022145171A1 - Multilayer film, optical film, and manufacturing method - Google Patents
Multilayer film, optical film, and manufacturing method Download PDFInfo
- Publication number
- WO2022145171A1 WO2022145171A1 PCT/JP2021/044536 JP2021044536W WO2022145171A1 WO 2022145171 A1 WO2022145171 A1 WO 2022145171A1 JP 2021044536 W JP2021044536 W JP 2021044536W WO 2022145171 A1 WO2022145171 A1 WO 2022145171A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- film
- stretching
- optical film
- multilayer film
- Prior art date
Links
- 239000010408 film Substances 0.000 title claims abstract description 242
- 239000012788 optical film Substances 0.000 title claims abstract description 105
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- 238000000034 method Methods 0.000 claims description 21
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- 238000007142 ring opening reaction Methods 0.000 description 15
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- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 2
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- YEVQZPWSVWZAOB-UHFFFAOYSA-N 2-(bromomethyl)-1-iodo-4-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=CC=C(I)C(CBr)=C1 YEVQZPWSVWZAOB-UHFFFAOYSA-N 0.000 description 1
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- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- GCPCLEKQVMKXJM-UHFFFAOYSA-N ethoxy(diethyl)alumane Chemical compound CCO[Al](CC)CC GCPCLEKQVMKXJM-UHFFFAOYSA-N 0.000 description 1
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- 239000002667 nucleating agent Substances 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 125000005498 phthalate group Chemical class 0.000 description 1
- XKJCHHZQLQNZHY-UHFFFAOYSA-N phthalimide Chemical compound C1=CC=C2C(=O)NC(=O)C2=C1 XKJCHHZQLQNZHY-UHFFFAOYSA-N 0.000 description 1
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- 150000003222 pyridines Chemical class 0.000 description 1
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 1
- VIHDTGHDWPVSMM-UHFFFAOYSA-N ruthenium;triphenylphosphane Chemical compound [Ru].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 VIHDTGHDWPVSMM-UHFFFAOYSA-N 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
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- 239000002002 slurry Substances 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- YOUIDGQAIILFBW-UHFFFAOYSA-J tetrachlorotungsten Chemical compound Cl[W](Cl)(Cl)Cl YOUIDGQAIILFBW-UHFFFAOYSA-J 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
- 229960001147 triclofos Drugs 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- WTLBZVNBAKMVDP-UHFFFAOYSA-N tris(2-butoxyethyl) phosphate Chemical class CCCCOCCOP(=O)(OCCOCCCC)OCCOCCCC WTLBZVNBAKMVDP-UHFFFAOYSA-N 0.000 description 1
- LIPMRGQQBZJCTM-UHFFFAOYSA-N tris(2-propan-2-ylphenyl) phosphate Chemical class CC(C)C1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C(C)C)OC1=CC=CC=C1C(C)C LIPMRGQQBZJCTM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0073—Optical laminates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
- B29D11/00788—Producing optical films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00865—Applying coatings; tinting; colouring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- 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
-
- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
-
- 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
-
- 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
Abstract
Description
すなわち、本発明は、下記のものを含む。 The present inventor has studied to solve the above-mentioned problems. As a result, the present inventor has adopted a particular material as one of a multilayer film in which a layer of a material having a positive intrinsic birefringence and a layer of a material having a negative intrinsic birefringence are combined in a wide wavelength range. It has been found that a multilayer film that can exhibit a good effect as a three-dimensional retardation film and can be easily manufactured can be formed. Based on this finding, the inventor has completed the present invention.
That is, the present invention includes the following.
前記pA層が下記式(1)~(2)を満たし、前記pB層が下記式(3)~(4)を満たす、多層フィルム:
nz(pA)>nx(pA)≧ny(pA) ・・・(1)
nx(pA)-ny(pA)≦0.0003 ・・・(2)
nz(pB)>nx(pB)≧ny(pB) ・・・(3)
nx(pB)-ny(pB)≦0.0003 ・・・(4)
但し、
nx(pA)、ny(pA)及びnz(pA)は、前記pA層の主屈折率であり、
nx(pB)、ny(pB)及びnz(pB)は、前記pB層の主屈折率である。
〔2〕 長尺フィルムである、〔1〕に記載の多層フィルム。
〔3〕 前記pA層と、前記pB層とが、直接接する、〔1〕又は〔2〕に記載の多層フィルム。
〔4〕 pB層の厚みが、20μm以下である、〔1〕~〔3〕のいずれか1項に記載の多層フィルム。
〔5〕 〔1〕~〔4〕のいずれか1項に記載の多層フィルムの一軸共延伸物であり、固有複屈折が正の結晶性樹脂(a)からなるA層と、固有複屈折が負の材料(b)からなるB層とを備える光学フィルムであって、
下記式(5)及び(6)を満たす、光学フィルム。
Re(450)<Re(550)<Re(650) ・・・(5)
Nz<1 ・・・(6)
但し、
Re(450)、Re(550)及びRe(650)は、それぞれ、前記光学フィルムの波長450nmにおける面内レターデーション、前記光学フィルムの波長550nmにおける面内レターデーション、及び前記光学フィルムの波長650nmにおける面内レターデーションであり、
Nzは前記光学フィルムのNz係数である。
〔6〕 長尺フィルムである、〔5〕に記載の光学フィルム。
〔7〕 前記一軸共延伸が、縦一軸共延伸、横一軸共延伸、又は、斜め一軸共延伸である、〔5〕又は〔6〕に記載の光学フィルム。
〔8〕 B層の厚みが、20μm以下である、〔5〕~〔7〕のいずれか1項に記載の光学フィルム。
〔9〕 1層の前記A層と、その両面に形成された2層の前記B層とを備える、〔5〕~〔8〕のいずれか1項に記載の光学フィルム。
〔10〕 〔1〕~〔4〕のいずれか1項に記載の多層フィルムの製造方法であって、
結晶性樹脂(a)からなるフィルムoAを用意する工程(I)と、
溶媒、及び前記溶媒に溶解した固有複屈折が負の材料(b)を含む液状組成物を、前記フィルムoAの片面又は両面に塗布して、それによりpB層を形成し且つ前記フィルムoAの厚み方向の複屈折を変化させpA層とし、前記pA層及び前記pB層とを備える多層フィルムを得る工程(II)と、を含む製造方法。
〔11〕 〔5〕~〔9〕のいずれか1項に記載の光学フィルムの製造方法であって、
結晶性樹脂(a)からなるフィルムoAを用意する工程(I)と、
溶媒、及び前記溶媒に溶解した固有複屈折が負の材料(b)を含む液状組成物を、前記フィルムoAの片面又は両面に塗布して、それによりpB層を形成し且つ前記フィルムoAの厚み方向の複屈折を変化させpA層とし、前記pA層及び前記pB層とを備える多層フィルムを得る工程(II)と、
前記多層フィルムを一軸共延伸する工程(III)と、を含む製造方法。 [1] A multilayer film comprising a pA layer made of a crystalline resin (a) having a positive birefringence and a pB layer made of a material (b) having a negative birefringence.
A multilayer film in which the pA layer satisfies the following formulas (1) to (2) and the pB layer satisfies the following formulas (3) to (4):
nz (pA)> nx (pA) ≧ ny (pA) ・ ・ ・ (1)
nx (pA) -ny (pA) ≤ 0.0003 ... (2)
nz (pB)> nx (pB) ≧ ny (pB) ・ ・ ・ (3)
nx (pB) -ny (pB) ≤ 0.0003 ... (4)
however,
nx (pA), ny (pA) and nz (pA) are the main refractive indexes of the pA layer.
nx (pB), ny (pB) and nz (pB) are the main refractive indexes of the pB layer.
[2] The multilayer film according to [1], which is a long film.
[3] The multilayer film according to [1] or [2], wherein the pA layer and the pB layer are in direct contact with each other.
[4] The multilayer film according to any one of [1] to [3], wherein the pB layer has a thickness of 20 μm or less.
[5] The uniaxial co-stretched product of the multilayer film according to any one of [1] to [4], the layer A made of a crystalline resin (a) having a positive intrinsic birefringence, and the intrinsic birefringence. An optical film comprising a layer B made of a negative material (b).
An optical film satisfying the following formulas (5) and (6).
Re (450) <Re (550) <Re (650) ... (5)
Nz <1 ... (6)
however,
Re (450), Re (550) and Re (650) are the in-plane retardation of the optical film at a wavelength of 450 nm, the in-plane retardation of the optical film at a wavelength of 550 nm, and the optical film at a wavelength of 650 nm, respectively. It is an in-plane letteration,
Nz is the Nz coefficient of the optical film.
[6] The optical film according to [5], which is a long film.
[7] The optical film according to [5] or [6], wherein the uniaxial co-stretching is vertical uniaxial co-stretching, horizontal uniaxial co-stretching, or diagonal uniaxial co-stretching.
[8] The optical film according to any one of [5] to [7], wherein the thickness of the B layer is 20 μm or less.
[9] The optical film according to any one of [5] to [8], comprising one layer A and two layers B formed on both sides thereof.
[10] The method for producing a multilayer film according to any one of [1] to [4].
The step (I) of preparing the film oA made of the crystalline resin (a) and
A liquid composition containing a solvent and a material (b) having a negative intrinsic birefringence dissolved in the solvent is applied to one or both sides of the film oA to form a pB layer and the thickness of the film oA. A production method comprising a step (II) of obtaining a multilayer film including the pA layer and the pB layer by changing the birefringence in the direction to form a pA layer.
[11] The method for producing an optical film according to any one of [5] to [9].
The step (I) of preparing the film oA made of the crystalline resin (a) and
A liquid composition containing a solvent and a material (b) having a negative intrinsic birefringence dissolved in the solvent is applied to one or both sides of the film oA to form a pB layer and the thickness of the film oA. The step (II) of obtaining a multilayer film having the pA layer and the pB layer by changing the birefringence in the direction to form a pA layer.
A production method comprising the step (III) of co-stretching the multilayer film.
本発明の多層フィルムは、固有複屈折が正の結晶性樹脂(a)からなるpA層と、固有複屈折が負の材料(b)からなるpB層とを備える。 [Multilayer film: Optical characteristics]
The multilayer film of the present invention includes a pA layer made of a crystalline resin (a) having a positive intrinsic birefringence and a pB layer made of a material (b) having a negative intrinsic birefringence.
nz(pA)>nx(pA)≧ny(pA) ・・・(1)
nx(pA)-ny(pA)≦0.0003 ・・・(2)
nz(pB)>nx(pB)≧ny(pB) ・・・(3)
nx(pB)-ny(pB)≦0.0003 ・・・(4)
nx(pA)、ny(pA)及びnz(pA)は、pA層の主屈折率であり、nx(pB)、ny(pB)及びnz(pB)は、pB層の主屈折率である。 The pA layer satisfies the following formulas (1) to (2), and the pB layer satisfies the following formulas (3) to (4).
nz (pA)> nx (pA) ≧ ny (pA) ・ ・ ・ (1)
nx (pA) -ny (pA) ≤ 0.0003 ... (2)
nz (pB)> nx (pB) ≧ ny (pB) ・ ・ ・ (3)
nx (pB) -ny (pB) ≤ 0.0003 ... (4)
nx (pA), ny (pA) and nz (pA) are the main refractive indexes of the pA layer, and nx (pB), ny (pB) and nz (pB) are the main refractive indexes of the pB layer.
本発明の多層フィルムは、長尺のフィルムとしうる。「長尺」のフィルムとは、幅に対して、5倍以上の長さを有するフィルムをいい、好ましくは10倍若しくはそれ以上の長さを有し、具体的にはロール状に巻き取られて保管又は運搬される程度の長さを有するフィルムをいう。長さの上限に特段の制限は無いが、通常、幅に対して10万倍以下である。多層フィルムが長尺のフィルムであることにより、効率的な光学フィルムの製造を達成することができる。 [Multilayer film: Other features]
The multilayer film of the present invention can be a long film. The "long" film means a film having a length of 5 times or more with respect to the width, preferably having a length of 10 times or more, and specifically being wound into a roll. A film that is long enough to be stored or transported. There is no particular limitation on the upper limit of the length, but it is usually 100,000 times or less with respect to the width. Since the multilayer film is a long film, efficient production of an optical film can be achieved.
ある態様において、後述する本発明の多層フィルムの製造方法を効率的に行う観点からは、本発明の多層フィルムは、pA層及びpB層を一層ずつ備えることが好ましい。
別のある態様において、本発明の多層フィルムは、一層のpA層と、その両面に形成された2層のpB層を有することが好ましい。即ち、本発明の多層フィルムは(pB層)/(pA層)/(pB層)の層構成を有するフィルムとしうる。後述する本発明の多層フィルムの製造方法では、pA層を形成するためのフィルムの両面にpB層を形成することが可能であるため、(pB層)/(pA層)/(pB層)の層構成を有するフィルムを容易に製造しうる。かかる層構成を有する場合、一層当たりのpB層の厚みが薄くても、所望の光学特性を有する多層フィルムを容易に得ることが可能であるため好ましい。 The multilayer film of the present invention may include a pA layer and a pB layer one by one. The multilayer film of the present invention may also have two or more pA layers, or may have two or more pB layers.
In one embodiment, from the viewpoint of efficiently performing the method for producing a multilayer film of the present invention described later, it is preferable that the multilayer film of the present invention includes one layer each of a pA layer and a pB layer.
In another embodiment, the multilayer film of the present invention preferably has one layer of pA and two layers of pB formed on both sides thereof. That is, the multilayer film of the present invention can be a film having a layer structure of (pB layer) / (pA layer) / (pB layer). In the method for producing a multilayer film of the present invention described later, since it is possible to form pB layers on both sides of the film for forming the pA layer, (pB layer) / (pA layer) / (pB layer) A film having a layered structure can be easily produced. When having such a layer structure, it is preferable because a multilayer film having desired optical characteristics can be easily obtained even if the thickness of the pB layer per layer is thin.
pA層を構成する結晶性樹脂(a)は、結晶性を有する重合体を含む樹脂としうる。「結晶性を有する重合体」とは、融点Tmを有する重合体を表す。すなわち、「結晶性を有する重合体」とは、示差走査熱量計(DSC)で融点を観測することができる重合体を表す。以下の説明において、結晶性を有する重合体を、「結晶性重合体」ということがある。結晶性樹脂は、好ましくは熱可塑性樹脂である。 [Materials constituting the pA layer]
The crystalline resin (a) constituting the pA layer can be a resin containing a polymer having crystallinity. The "polymer having crystallinity" represents a polymer having a melting point Tm. That is, the "polymer having crystallinity" represents a polymer whose melting point can be observed with a differential scanning calorimeter (DSC). In the following description, a polymer having crystallinity may be referred to as a “crystalline polymer”. The crystalline resin is preferably a thermoplastic resin.
重合体(α):環状オレフィン単量体の開環重合体であって、結晶性を有するもの。
重合体(β):重合体(α)の水素化物であって、結晶性を有するもの。
重合体(γ):環状オレフィン単量体の付加重合体であって、結晶性を有するもの。
重合体(δ):重合体(γ)の水素化物であって、結晶性を有するもの。 Examples of the crystalline polymer containing an alicyclic structure include the following polymers (α) to (δ). Among these, the polymer (β) is preferable because it is easy to obtain a retardation film having excellent heat resistance.
Polymer (α): A ring-opening polymer of a cyclic olefin monomer having crystallinity.
Polymer (β): A hydride of the polymer (α) having crystallinity.
Polymer (γ): An addition polymer of a cyclic olefin monomer having crystallinity.
Polymer (δ): A hydride of the polymer (γ) that has crystallinity.
ラセモ・ダイアッドの割合は、後述する実施例に記載の13C-NMRスペクトル分析に基づいて決定できる。 The hydride of the ring-opening polymer of dicyclopentadiene preferably has a high proportion of racemic diad. Specifically, the proportion of the repeating unit racemic diad in the hydride of the ring-opening polymer of dicyclopentadiene is preferably 51% or more, more preferably 70% or more, and particularly preferably 85% or more. A high proportion of racemic diads indicates a high syndiotactic stereoregularity. Therefore, the higher the proportion of racemic diad, the higher the melting point of the hydride of the ring-opening polymer of dicyclopentadiene tends to be.
The proportion of racemo diads can be determined based on the 13 C-NMR spectral analysis described in Examples described below.
結晶性重合体の結晶化度は、X線回折法によって測定しうる。 The crystallinity of the crystalline polymer contained in the retardation film is not particularly limited, but is usually higher than a certain level. The specific range of crystallinity is preferably 10% or more, more preferably 15% or more, and particularly preferably 30% or more.
The crystallinity of the crystalline polymer can be measured by X-ray diffraction.
pA層を構成する結晶性樹脂(a)は、有機溶媒を含みうる。この有機溶媒は、通常、本発明の製造方法の工程(II)においてフィルム中に取り込まれたものである。 [Organic solvent contained in the crystalline resin (a)]
The crystalline resin (a) constituting the pA layer may contain an organic solvent. This organic solvent is usually incorporated into the film in the step (II) of the production method of the present invention.
pB層を構成する材料(b)は、負の固有複屈折を有する。材料(b)として負の固有複屈折を有する樹脂を用い、これを、正の固有複屈折を有する結晶性樹脂(a)と組み合わせることにより、本発明の要件を満たす多層フィルムを特に容易に製造できる。 [Materials constituting the pB layer]
The material (b) constituting the pB layer has a negative intrinsic birefringence. By using a resin having a negative intrinsic birefringence as the material (b) and combining this with a crystalline resin (a) having a positive intrinsic birefringence, it is particularly easy to produce a multilayer film satisfying the requirements of the present invention. can.
本発明の光学フィルムは、前記本発明の多層フィルムの一軸共延伸物である。即ち、本発明のフィルムは、前記本発明の多層フィルムを延伸することにより、pA層及びpB層を共延伸してなるものである。かかる共延伸により、多層フィルムに含まれる全ての層が同じ延伸倍率及び延伸方向で延伸され、これらの層に含まれる重合体の分子は、延伸方向に応じた方向に配向される。多層フィルムは、式(1)~(4)で規定される特定の要件を備えるため、光学フィルム用樹脂を単に延伸するといった通常の位相差フィルムの製造方法では得ることが困難な光学特性を備える光学フィルムを容易に得ることができる。 [Optical film]
The optical film of the present invention is a uniaxial co-stretched product of the multilayer film of the present invention. That is, the film of the present invention is formed by co-stretching the pA layer and the pB layer by stretching the multilayer film of the present invention. By such co-stretching, all the layers contained in the multilayer film are stretched at the same stretching ratio and stretching direction, and the polymer molecules contained in these layers are oriented in the direction corresponding to the stretching direction. Since the multilayer film has the specific requirements specified by the formulas (1) to (4), it has optical properties that are difficult to obtain by a normal method for producing an retardation film, such as simply stretching a resin for an optical film. An optical film can be easily obtained.
Re(450)<Re(550)<Re(650) ・・・(5)
Nz<1 ・・・(6) The optical film of the present invention satisfies the following formulas (5) and (6).
Re (450) <Re (550) <Re (650) ... (5)
Nz <1 ... (6)
Nz<0 ・・・(7)
0<Nz<1 ・・・(8) In a preferred embodiment, the optical film of the present invention satisfies the following formula (7) or the following formula (8).
Nz <0 ... (7)
0 <Nz <1 ... (8)
光学フィルムをλ/2波長板として用いうる場合は、Re(550)の好ましい範囲は275nm又はそれに近い値、具体的には好ましくは260~290nm、より好ましくは265~285nmの範囲としうる。 The values of Re (450), Re (550) and Re (650) can be adjusted to the values suitable for the application of the optical film. When the optical film can be used as a λ / 4 wave plate, Re (550) is preferably 80 nm or more, more preferably 100 nm or more, particularly preferably 120 nm or more, preferably 180 nm or less, more preferably 160 nm or less. It is particularly preferably 150 nm or less.
When the optical film can be used as a λ / 2 wave plate, the preferred range of Re (550) may be 275 nm or a value close to it, specifically, preferably 260 to 290 nm, and more preferably 265 to 285 nm.
本発明の多層フィルムは、下記工程(I)~(II)を含む製造方法により製造しうる。また、本発明の光学フィルムは、下記工程(I)~(II)に加えて、下記工程(III)を含む製造方法により製造しうる。
工程(I):結晶性樹脂(a)からなるフィルムoAを用意する工程。
工程(II):溶媒、及び溶媒に溶解した固有複屈折が負の材料(b)を含む液状組成物を、フィルムoAの片面又は両面に塗布して、それによりpB層を形成し且つフィルムoAの厚み方向の複屈折を変化させpA層とし、pA層及びpB層とを備える多層フィルムを得る工程。
工程(III):多層フィルムを一軸共延伸する工程。
以下において、かかる製造方法を、本発明の多層フィルムの製造方法及び本発明の光学フィルムの製造方法として説明する。 [Manufacturing method of multilayer film and manufacturing method of optical film]
The multilayer film of the present invention can be produced by a production method including the following steps (I) to (II). Further, the optical film of the present invention can be produced by a production method including the following steps (III) in addition to the following steps (I) to (II).
Step (I): A step of preparing a film oA made of the crystalline resin (a).
Step (II): A liquid composition containing a solvent and a material (b) having a negative intrinsic birefringence dissolved in the solvent is applied to one or both sides of the film oA to form a pB layer and the film oA. A step of obtaining a multilayer film including a pA layer and a pB layer by changing the birefringence in the thickness direction to form a pA layer.
Step (III): A step of co-stretching the multilayer film.
Hereinafter, such a manufacturing method will be described as a method for manufacturing a multilayer film of the present invention and a method for manufacturing an optical film of the present invention.
工程(I)は、結晶性樹脂(a)をフィルムの形状に成形することにより行いうる。工程(I)はまた、単に市販のフィルムを入手することにより行ってもよい。結晶性樹脂(a)をフィルムの形状に成形する方法としては、任意の成形方法を採用しうる。製造効率の観点からは、溶融押出成形が好ましい。フィルムoAの厚みは、製品たる多層フィルムにおけるpA層及び光学フィルムにおけるA層の厚みが所望の厚みとなるよう適宜調整しうる。 [Step (I)]
The step (I) can be performed by molding the crystalline resin (a) into the shape of a film. Step (I) may also be performed simply by obtaining a commercially available film. Any molding method can be adopted as a method for molding the crystalline resin (a) into the shape of a film. From the viewpoint of production efficiency, melt extrusion molding is preferable. The thickness of the film oA can be appropriately adjusted so that the thickness of the pA layer in the multilayer film as a product and the thickness of the A layer in the optical film are desired.
工程(II)では、溶媒、及び材料(b)を含む液状組成物を使用する。溶媒の例としては、上に述べた、pA層を構成する結晶性樹脂(a)に含まれた状態として存在しうる有機溶媒の例として挙げたものと同じ例が挙げられる。より具体的には、トルエン、リモネン、デカリン等の炭化水素溶媒;メチルエチルケトン等のケトン;並びに二硫化炭素が挙げられる。フィルムoAを変化させる効果を発現し、且つ固有複屈折が負の重合体を良好に溶解する観点からは、メチルエチルケトン等のケトン、またはケトンとその他の溶媒との混合溶媒が特に好ましい。液状組成物に含まれる溶媒の種類は、1種類でもよく、2種類以上でもよい。 [Step (II): Liquid composition]
In step (II), a liquid composition containing a solvent and material (b) is used. Examples of the solvent include the same examples as those mentioned above as examples of the organic solvent that may exist as a state contained in the crystalline resin (a) constituting the pA layer. More specifically, hydrocarbon solvents such as toluene, limonene and decalin; ketones such as methyl ethyl ketone; and carbon disulfide can be mentioned. From the viewpoint of exhibiting the effect of changing the film oA and satisfactorily dissolving the polymer having negative intrinsic birefringence, a ketone such as methyl ethyl ketone or a mixed solvent of the ketone and another solvent is particularly preferable. The type of the solvent contained in the liquid composition may be one type or two or more types.
工程(II)では、液状組成物を、フィルムoAの片面又は両面に塗布する。塗布の具体的な操作は、特に限定されないが、均一な所望の厚みのB層を形成する観点から、塗布厚みを精密に制御できる操作であることが好ましい。具体的には例えばダイコーター等のコーターによる塗布が好ましい。 [Step (II): Coating]
In step (II), the liquid composition is applied to one or both sides of the film oA. The specific operation of coating is not particularly limited, but it is preferable that the coating thickness can be precisely controlled from the viewpoint of forming the B layer having a uniform desired thickness. Specifically, for example, coating with a coater such as a die coater is preferable.
工程(III)では、工程(II)で得られた多層フィルムを一軸共延伸する。かかる共延伸により、多層フィルムのpA層及びpB層に含まれる重合体の分子は、延伸方向に応じた方向に配向される。多層フィルムは、工程(II)を経ているため、工程(III)の結果、光学フィルム用樹脂を単に延伸するといった通常の位相差フィルムの製造方法では得ることが困難な光学特性を備える光学フィルムを容易に得ることができる。工程(III)における延伸方向に制限はなく、例えば、長手方向、幅方向、斜め方向などが挙げられる。 [Step (III)]
In the step (III), the multilayer film obtained in the step (II) is uniaxially co-stretched. By such co-stretching, the molecules of the polymer contained in the pA layer and the pB layer of the multilayer film are oriented in the direction corresponding to the stretching direction. Since the multilayer film has undergone the step (II), as a result of the step (III), an optical film having optical characteristics that are difficult to obtain by a normal method for producing an retardation film, such as simply stretching a resin for an optical film, is obtained. It can be easily obtained. The stretching direction in the step (III) is not limited, and examples thereof include a longitudinal direction, a width direction, and an oblique direction.
本発明の多層フィルムの製造方法及び本発明の光学フィルムの製造方法は、上述した工程に組み合わせて、更に任意の工程を含みうる。例えば、工程(II)の後で、液状組成物中の溶媒を乾燥させる工程を含みうる。 [Other processes]
The method for producing a multilayer film of the present invention and the method for producing an optical film of the present invention may further include any step in combination with the above-mentioned steps. For example, after step (II), the step of drying the solvent in the liquid composition may be included.
本発明の光学フィルムは、必要に応じて矩形などの所望の形状に加工した上で、表示装置等の光学装置の構成要素として使用しうる。本発明の光学フィルムを表示装置の構成要素として用いた場合、表示装置に表示される画像の視野角、コントラスト、画質等の表示品質を改善することができる。 [Use of optical film]
The optical film of the present invention can be used as a component of an optical device such as a display device after being processed into a desired shape such as a rectangle, if necessary. When the optical film of the present invention is used as a component of the display device, it is possible to improve the display quality such as the viewing angle, contrast, and image quality of the image displayed on the display device.
以下の説明において、量を表す「%」及び「部」は、別に断らない限り、重量基準である。また、以下に説明する操作は、別に断らない限り、常温及び常圧の条件において行った。 Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the examples shown below, and may be arbitrarily modified and carried out without departing from the scope of claims of the present invention and the equivalent scope thereof.
In the following description, "%" and "part" representing quantities are based on weight unless otherwise specified. The operations described below were performed under normal temperature and pressure conditions unless otherwise specified.
(重合体の重量平均分子量Mw及び数平均分子量Mnの測定方法)
重合体の重量平均分子量Mw及び数平均分子量Mnは、ゲル・パーミエーション・クロマトグラフィー(GPC)システム(東ソー社製「HLC-8320」)を用いて、ポリスチレン換算値として測定した。測定の際、カラムとしてはHタイプカラム(東ソー社製)を用い、溶媒としてはテトラヒドロフランを用いた。また、測定時の温度は、40℃であった。 〔Evaluation method〕
(Method for measuring weight average molecular weight Mw and number average molecular weight Mn of polymer)
The weight average molecular weight Mw and the number average molecular weight Mn of the polymer were measured as polystyrene-equivalent values using a gel permeation chromatography (GPC) system (“HLC-8320” manufactured by Tosoh Corporation). At the time of measurement, an H type column (manufactured by Tosoh Corporation) was used as the column, and tetrahydrofuran was used as the solvent. The temperature at the time of measurement was 40 ° C.
重合体の水素化率は、オルトジクロロベンゼン-d4を溶媒として、145℃で、1H-NMR測定により測定した。 (Measuring method of hydrogenation rate of polymer)
The hydrogenation rate of the polymer was measured by 1 H-NMR measurement at 145 ° C. using orthodichlorobenzene - d4 as a solvent.
重合体のガラス転移温度Tg及び融点Tmの測定は、以下のようにして行った。まず、重合体を、加熱によって融解させ、融解した重合体をドライアイスで急冷した。続いて、この重合体を試験体として用いて、示差走査熱量計(DSC)を用いて、10℃/分の昇温速度(昇温モード)で、重合体のガラス転移温度Tg及び融点Tmを測定した。 (Measurement method of glass transition temperature Tg and melting point Tm)
The glass transition temperature Tg and the melting point Tm of the polymer were measured as follows. First, the polymer was melted by heating, and the melted polymer was rapidly cooled with dry ice. Subsequently, using this polymer as a test piece, the glass transition temperature Tg and melting point Tm of the polymer were measured at a heating rate of 10 ° C./min (heating mode) using a differential scanning calorimeter (DSC). It was measured.
重合体のラセモ・ダイアッドの割合の測定は以下のようにして行った。オルトジクロロベンゼン-d4を溶媒として、200℃で、inverse-gated decoupling法を適用して、重合体の13C-NMR測定を行った。この13C-NMR測定の結果において、オルトジクロロベンゼン-d4の127.5ppmのピークを基準シフトとして、メソ・ダイアッド由来の43.35ppmのシグナルと、ラセモ・ダイアッド由来の43.43ppmのシグナルとを同定した。これらのシグナルの強度比に基づいて、重合体のラセモ・ダイアッドの割合を求めた。 (Measuring method of racemic diad ratio of polymer)
The ratio of racemic diads in the polymer was measured as follows. 13 C-NMR measurement of the polymer was carried out by applying the inverted-gated decoupling method at 200 ° C. using ordichlorobenzene - d4 as a solvent. In the results of this 13 C-NMR measurement, the signal of 43.35 ppm derived from meso-diad and the signal of 43.43 ppm derived from racemic diad were used as the reference shift with the peak of 127.5 ppm of orthodichlorobenzene - d4 as a reference shift. Was identified. Based on the intensity ratios of these signals, the proportion of racemic diads in the polymer was determined.
フィルムの光学特性(面内方向のレターデーションRe、厚み方向のレターデーションRth及びNZ係数等)は、位相差計(Axometrics社製「AxoScan」)を用いて測定した。測定波長は、別に断らない場合は590nmで測定した。
A層(又はpA層)と、B層(又はpB層)とを備えるフィルムの各層を分離する場合の分離の手順は、以下の通りとした。フィルムのB層(又はpB層)側を、粘着層を介して、ガラスプレートに貼合した。その後、カッターを用いて、プレートの淵に切り込みを入れてA層(又はpA層)とB層(又はpB層)とを剥離した。剥離したA層(又はpA層)、及びガラスプレート上のB層(又はpB層)のそれぞれについて、別々に光学特性を測定した。 (Measuring method of optical properties of film)
The optical properties of the film (letteration Re in the in-plane direction, retardation Rth in the thickness direction, NZ coefficient, etc.) were measured using a phase difference meter (“AxoScan” manufactured by Axometrics). The measurement wavelength was 590 nm unless otherwise specified.
The procedure for separating each layer of the film including the A layer (or pA layer) and the B layer (or pB layer) was as follows. The B layer (or pB layer) side of the film was attached to the glass plate via the adhesive layer. Then, using a cutter, a cut was made in the edge of the plate to separate the A layer (or pA layer) and the B layer (or pB layer). The optical characteristics of each of the peeled A layer (or pA layer) and the B layer (or pB layer) on the glass plate were measured separately.
スナップゲージ(ミツトヨ社製「ID-C112BS」)を用いて、フィルムの幅方向において5cm間隔の複数の地点で厚みを測定した。それらの測定値の平均値を計算することにより、フィルムの平均厚みを求めた。 (Measuring method of film thickness)
Using a snap gauge (“ID-C112BS” manufactured by Mitutoyo Co., Ltd.), the thickness was measured at a plurality of points at intervals of 5 cm in the width direction of the film. By calculating the average value of those measured values, the average thickness of the film was obtained.
結晶性重合体の結晶化度(%)は、X線回折法によって測定した。 (Crystallinity)
The crystallinity (%) of the crystalline polymer was measured by an X-ray diffraction method.
試料としてのフィルムについて、卓上型耐久試験機(ユアサシステム機器社製「DLDMLH-FS」)を用いて、面状体無負荷U字伸縮試験を行った。この試験では、幅50mm、曲げ半径1mm、伸縮速度80回/分の条件で、繰り返し、フィルムの折り曲げを行った。折り曲げ回数1000回後に、装置を停止して、フィルムを目視確認し、下記の評価基準で評価した。
「良」:フィルム片の破断、クラックの発生、白化、の何れも見られなかった。
「不良」:フィルム片の破断、クラックの発生、白化、の何れかが見られた。 (Bending durability)
The film as a sample was subjected to a planar unloaded U-shaped expansion / contraction test using a desktop durability tester (“DLDMLLH-FS” manufactured by Yuasa System Equipment Co., Ltd.). In this test, the film was repeatedly bent under the conditions of a width of 50 mm, a bending radius of 1 mm, and an expansion / contraction speed of 80 times / minute. After 1000 times of bending, the apparatus was stopped, the film was visually confirmed, and the film was evaluated according to the following evaluation criteria.
"Good": No breakage, cracking, or whitening of the film piece was observed.
"Defective": Either the film piece was broken, cracks were generated, or whitening was observed.
フィルムの幅方向中央箇所からフィルム片を切り出し、長さ50mm×幅50mmの正方形のサンプルを得た。このサンプルについて、ヘイズメーター(日本電色工業社製「NDH5000」)を用いて、ヘイズを測定した。 (Haze)
A piece of film was cut out from the center of the film in the width direction to obtain a square sample having a length of 50 mm and a width of 50 mm. The haze of this sample was measured using a haze meter (“NDH5000” manufactured by Nippon Denshoku Kogyo Co., Ltd.).
長手方向に吸収軸を有する長尺の直線偏光フィルムを用意した。この直線偏光フィルムと、評価対象の光学フィルムとを貼合した。貼合に際し、直線偏光フィルムの吸収軸と光学フィルムの吸収軸とが45°の角度をなすよう、角度を調整した。この貼合は、粘着剤(日東電工社製「CS-9621」)を用いて行った。これにより、円偏光フィルムを得た。
画像表示装置(Apple社「AppleWatch」(登録商標))が備える偏光板を剥離し、その画像表示装置の表示面と、評価対象の円偏光フィルムの光学フィルム側の面とを、粘着層(日東電工製「CS9621」)を介して貼り合せた。表示面を黒表示状態(画面全体に黒色を表示した状態)にし、極角θ=0°(正面方向)、及び、極角θ=60°(傾斜方向)の全方位から、表示面を観察した。外光の反射による輝度及び色付きが小さいほど、良好な結果である。観察の結果を、下記の基準で評価した。
「A」: 視認できるレベルの輝度及び色付きが、ない。
「B」: 輝度及び色付きが、視認できるレベルで発生する。
「C」: 輝度及び色付きが、酷く発生する。 (Display quality improvement effect)
A long linear polarizing film having an absorption axis in the longitudinal direction was prepared. This linearly polarizing film and the optical film to be evaluated were bonded together. At the time of bonding, the angle was adjusted so that the absorption axis of the linear polarizing film and the absorption axis of the optical film formed an angle of 45 °. This bonding was performed using an adhesive (“CS-9621” manufactured by Nitto Denko Corporation). As a result, a circularly polarizing film was obtained.
The polarizing plate provided in the image display device (Apple Watch "Apple Watch" (registered trademark)) is peeled off, and the display surface of the image display device and the surface of the circularly polarizing film to be evaluated on the optical film side are separated into an adhesive layer (Nitto). It was pasted together via Denko's "CS9621"). Set the display surface to the black display state (black is displayed on the entire screen), and observe the display surface from all directions of polar angle θ = 0 ° (front direction) and polar angle θ = 60 ° (tilt direction). did. The smaller the brightness and coloring due to the reflection of external light, the better the result. The results of the observations were evaluated according to the following criteria.
"A": There is no visible level of brightness and coloring.
"B": Luminance and coloring occur at a visible level.
"C": Luminance and coloring occur severely.
金属製の耐圧反応器を、充分に乾燥した後、窒素置換した。この金属製耐圧反応器に、シクロヘキサン154.5部、ジシクロペンタジエン(エンド体含有率99%以上)の濃度70%シクロヘキサン溶液42.8部(ジシクロペンタジエンの量として30部)、及び1-ヘキセン1.8部を加え、53℃に加温した。 [Production Example 1: Hydride of ring-opening polymer of dicyclopentadiene]
The pressure resistant reactor made of metal was sufficiently dried and then replaced with nitrogen. In this metal pressure resistant reactor, 154.5 parts of cyclohexane, 42.8 parts of a 70% cyclohexane solution of dicyclopentadiene (endo content of 99% or more) (30 parts as the amount of dicyclopentadiene), and 1- 1.8 parts of hexene was added and the mixture was heated to 53 ° C.
この触媒溶液を耐圧反応器内の混合物に加えて、開環重合反応を開始した。その後、53℃を保ちながら4時間反応させて、ジシクロペンタジエンの開環重合体の溶液を得た。
得られたジシクロペンタジエンの開環重合体の数平均分子量(Mn)及び重量平均分子量(Mw)は、それぞれ、8,830および29,800であり、これらから求められる分子量分布(Mw/Mn)は3.37であった。 0.014 parts of the tetrachlorotungsten phenylimide (tetrahydrofuran) complex was dissolved in 0.70 parts of toluene to prepare a solution. To this solution, 0.061 part of a diethylaluminum ethoxide / n-hexane solution having a concentration of 19% was added and stirred for 10 minutes to prepare a catalytic solution.
This catalyst solution was added to the mixture in the pressure resistant reactor to initiate a ring-opening polymerization reaction. Then, the reaction was carried out for 4 hours while maintaining 53 ° C. to obtain a solution of a ring-opening polymer of dicyclopentadiene.
The number average molecular weight (Mn) and weight average molecular weight (Mw) of the obtained ring-opening polymer of dicyclopentadiene are 8,830 and 29,800, respectively, and the molecular weight distribution (Mw / Mn) obtained from these. Was 3.37.
製造例1で得たジシクロペンタジエンの開環重合体の水素化物100部に、酸化防止剤(テトラキス〔メチレン-3-(3’,5’-ジ-t-ブチル-4’-ヒドロキシフェニル)プロピオネート〕メタン;BASFジャパン社製「イルガノックス(登録商標)1010」)1.1部を混合して、結晶性樹脂(a)を得た。 [Production Example 2: Pellet of Crystalline Resin (a)]
An antioxidant (tetrakis [methylene-3- (3', 5'-di-t-butyl-4'-hydroxyphenyl)) is added to 100 parts of the hydride of the ring-opening polymer of dicyclopentadiene obtained in Production Example 1. Propionate] Methane; 1.1 parts of "Irganox (registered trademark) 1010" manufactured by BASF Japan Co., Ltd.) was mixed to obtain a crystalline resin (a).
・バレル設定温度:270℃~280℃
・ダイ設定温度:250℃
・スクリュー回転数:145rpm
・フィーダー回転数:50rpm The obtained crystalline resin (a) was put into a twin-screw extruder (“TEM-37B” manufactured by Toshiba Machine Co., Ltd.) equipped with four die holes having an inner diameter of 3 mmΦ. The resin was hot melt extruded using a twin-screw extruder to form a strand-shaped molded product. This molded product was shredded with a strand cutter to obtain pellets of the crystalline resin (a). The operating conditions of the twin-screw extruder are shown below.
-Barrel set temperature: 270 ° C to 280 ° C
・ Die set temperature: 250 ℃
・ Screw rotation speed: 145 rpm
・ Feeder rotation speed: 50 rpm
(1-1.工程(I):フィルムoA)
製造例2で得られた結晶性樹脂(a)のペレットを、100℃で5時間乾燥した。乾燥したペレットを、フィルム成形機に供給した。フィルム成形機は、樹脂の流路において押出機、ポリマーパイプ、ポリマーフィルター及びTダイをこの順に備え、押出機に投入されたペレットを溶融させ、流路を通してTダイからフィルム状の形状に押出す装置である。フィルム成形機の運転条件として、バレル温度280℃~290℃、ダイ温度270℃、及びスクリュー回転数30rpmを設定した。このフィルム成形機により、溶融した結晶性樹脂(a)を、回転するキャストロール上に向けて、幅500mmのフィルム状に押し出した。このときのキャストロールの回転速度は、6m/分に設定した。その後、結晶性樹脂(a)は、ロール上で冷却されることにより、長尺のフィルム状に成形された。これにより、結晶性樹脂(a)からなるフィルムoAを得た。得られたフィルムoAの厚みは、68μmであった。得られたフィルムoAは巻芯に巻き取って回収しフィルムロールとした。 [Example 1]
(1-1. Step (I): Film oA)
The pellet of the crystalline resin (a) obtained in Production Example 2 was dried at 100 ° C. for 5 hours. The dried pellets were fed to the film forming machine. The film forming machine is equipped with an extruder, a polymer pipe, a polymer filter and a T-die in this order in the resin flow path, melts the pellets charged in the extruder, and extrudes the pellets from the T-die into a film shape through the flow path. It is a device. As the operating conditions of the film forming machine, a barrel temperature of 280 ° C. to 290 ° C., a die temperature of 270 ° C., and a screw rotation speed of 30 rpm were set. With this film forming machine, the molten crystalline resin (a) was extruded into a film having a width of 500 mm toward a rotating cast roll. The rotation speed of the cast roll at this time was set to 6 m / min. After that, the crystalline resin (a) was cooled on a roll to be formed into a long film. As a result, a film oA made of the crystalline resin (a) was obtained. The thickness of the obtained film oA was 68 μm. The obtained film oA was wound around a core and collected to obtain a film roll.
固有複屈折が負の材料としてのスチレン-無水マレイン酸共重合体を含む樹脂(ノヴァ・ケミカル社製「Daylark D332」、ガラス転移温度130℃)を、メチルエチルケトンに溶解し、液状組成物を調製した。液状組成物におけるスチレン-無水マレイン酸共重合体の濃度は10重量%であった。 (1-2. Step (II): Multilayer film)
A resin containing a styrene-maleic anhydride copolymer as a material having a negative intrinsic birefringence (“Daymark D332” manufactured by Nova Chemical Co., Ltd., glass transition temperature 130 ° C.) was dissolved in methyl ethyl ketone to prepare a liquid composition. .. The concentration of the styrene-maleic anhydride copolymer in the liquid composition was 10% by weight.
pA層の面内レターデーションRe(pA)は8nmであり、厚み方向レターデーションRth(pA)は-42nmであり、厚み方向の複屈折Rth(pA)/dは-0.6×10-3であり、NZ係数NZ(pA)は-4.53であった。
pB層の面内レターデーションRe(pB)は1nmであり、厚み方向レターデーションRth(pB)は-59nmであり、厚み方向の複屈折Rth(pA)/dは-5.9×10-3であり、NZ係数NZ(pA)は2.50であった。 The pA layer and the pB layer of the multilayer film were peeled off, the optical characteristics of each were measured, and the Re, Rth and Nz coefficients were determined.
The in-plane retardation Re (pA) of the pA layer is 8 nm, the thickness direction retardation Rth (pA) is -42 nm, and the birefringence Rth (pA) / d in the thickness direction is -0.6 × 10 -3 . The NZ coefficient NZ (pA) was −4.53.
The in-plane retardation Re (pB) of the pB layer is 1 nm, the thickness direction retardation Rth (pB) is -59 nm, and the birefringence Rth (pA) / d in the thickness direction is -5.9 × 10 -3 . The NZ coefficient NZ (pA) was 2.50.
(1-2)で得た多層フィルムをフィルムロールから引き出して、テンター延伸機に連続的に供給した。そして、テンター延伸機によって、多層フィルムの共延伸を行った。延伸方向は、フィルム幅方向とした。延伸温度は145℃、延伸倍率は1.15倍とした。その結果、固有複屈折が正の結晶性樹脂(a)からなるA層と、固有複屈折が負の材料(b)からなるB層とを備える光学フィルムが得られた。 (1-3. Step (III): Optical film)
The multilayer film obtained in (1-2) was pulled out from the film roll and continuously supplied to the tenter stretching machine. Then, the multilayer film was co-stretched by a tenter stretching machine. The stretching direction was the film width direction. The stretching temperature was 145 ° C. and the stretching ratio was 1.15 times. As a result, an optical film including an A layer made of a crystalline resin (a) having a positive intrinsic birefringence and a B layer made of a material (b) having a negative intrinsic birefringence was obtained.
下記の変更点の他は、実施例1と同じ操作により、多層フィルム及び光学フィルムを得て評価した。
・(1-3)の多層フィルムの共延伸において、フィルムの延伸を、長手方向に沿った自由端一軸延伸とし、延伸温度を140℃、延伸倍率を1.20とした。 [Example 2]
A multilayer film and an optical film were obtained and evaluated by the same operation as in Example 1 except for the following changes.
In the co-stretching of the multilayer film of (1-3), the film was stretched by free-end uniaxial stretching along the longitudinal direction, the stretching temperature was 140 ° C., and the stretching ratio was 1.20.
(C1-1.フィルム)
結晶性樹脂(a)のペレットに代えて、脂環式構造含有重合体の一種であるノルボルネン重合体を含む熱可塑性樹脂のペレット(日本ゼオン社製「ZEONOR1420」、ガラス転移点137℃)を用いた他は、実施例1の(1-1)と同じ操作により、非結晶性樹脂からなる厚み68μmのフィルムを得た。このフィルムの波長590nmにおける面内レターデーションReは3nmであり、厚み方向レターデーションRthは10nmであり、遅相軸方向は長手方向に対し幅方向であった。 [Comparative Example 1]
(C1-1. Film)
Instead of the pellet of the crystalline resin (a), a pellet of a thermoplastic resin containing a norbornene polymer which is a kind of alicyclic structure-containing polymer (“ZEONOR 1420” manufactured by Nippon Zeon Co., Ltd., glass transition point 137 ° C.) is used. A film having a thickness of 68 μm made of a non-crystalline resin was obtained by the same operation as in (1-1) of Example 1. The in-plane retardation Re at a wavelength of 590 nm of this film was 3 nm, the thickness direction retardation Rth was 10 nm, and the slow phase axial direction was the width direction with respect to the longitudinal direction.
(1-1)で得たフィルムoAに代えて、(C1-1)で得たフィルムを用いた他は、実施例1の(1-2)~(1-3)と同じ操作により、多層フィルム及び光学フィルムを得て評価した。但し、延伸温度は135℃、延伸倍率は1.20倍とした。
比較例1では、工程(II)の終了後工程(III)に供する前の段階で、多くの部分でpA層とpB層とが剥離してしまい、光学的な用途に使用できない部分が発生し、有効な薄膜形成ができた状態では無かったが、延伸は可能であった。光学フィルムの評価は、剥離が発生しなかった部分について行った。 (C1-2. Multilayer film and optical film)
By the same operation as in Examples 1 (1-2) to (1-3), the multilayer layer was used except that the film obtained in (C1-1) was used instead of the film oA obtained in (1-1). Films and optical films were obtained and evaluated. However, the stretching temperature was 135 ° C. and the stretching ratio was 1.20 times.
In Comparative Example 1, the pA layer and the pB layer are peeled off in many parts after the end of the step (II) and before the step (III), and a part that cannot be used for optical purposes is generated. Although it was not in a state where an effective thin film was formed, it was possible to stretch it. The evaluation of the optical film was performed on the portion where peeling did not occur.
Claims (11)
- 固有複屈折が正の結晶性樹脂(a)からなるpA層と、固有複屈折が負の材料(b)からなるpB層とを備える多層フィルムであって、
前記pA層が下記式(1)~(2)を満たし、前記pB層が下記式(3)~(4)を満たす、多層フィルム:
nz(pA)>nx(pA)≧ny(pA) ・・・(1)
nx(pA)-ny(pA)≦0.0003 ・・・(2)
nz(pB)>nx(pB)≧ny(pB) ・・・(3)
nx(pB)-ny(pB)≦0.0003 ・・・(4)
但し、
nx(pA)、ny(pA)及びnz(pA)は、前記pA層の主屈折率であり、
nx(pB)、ny(pB)及びnz(pB)は、前記pB層の主屈折率である。 A multilayer film comprising a pA layer made of a crystalline resin (a) having a positive birefringence and a pB layer made of a material (b) having a negative birefringence.
A multilayer film in which the pA layer satisfies the following formulas (1) to (2) and the pB layer satisfies the following formulas (3) to (4):
nz (pA)> nx (pA) ≧ ny (pA) ・ ・ ・ (1)
nx (pA) -ny (pA) ≤ 0.0003 ... (2)
nz (pB)> nx (pB) ≧ ny (pB) ・ ・ ・ (3)
nx (pB) -ny (pB) ≤ 0.0003 ... (4)
however,
nx (pA), ny (pA) and nz (pA) are the main refractive indexes of the pA layer.
nx (pB), ny (pB) and nz (pB) are the main refractive indexes of the pB layer. - 長尺フィルムである、請求項1に記載の多層フィルム。 The multilayer film according to claim 1, which is a long film.
- 前記pA層と、前記pB層とが、直接接する、請求項1又は2に記載の多層フィルム。 The multilayer film according to claim 1 or 2, wherein the pA layer and the pB layer are in direct contact with each other.
- pB層の厚みが、20μm以下である、請求項1~3のいずれか1項に記載の多層フィルム。 The multilayer film according to any one of claims 1 to 3, wherein the pB layer has a thickness of 20 μm or less.
- 請求項1~4のいずれか1項に記載の多層フィルムの一軸共延伸物であり、固有複屈折が正の結晶性樹脂(a)からなるA層と、固有複屈折が負の材料(b)からなるB層とを備える光学フィルムであって、
下記式(5)及び(6)を満たす、光学フィルム。
Re(450)<Re(550)<Re(650) ・・・(5)
Nz<1 ・・・(6)
但し、
Re(450)、Re(550)及びRe(650)は、それぞれ、前記光学フィルムの波長450nmにおける面内レターデーション、前記光学フィルムの波長550nmにおける面内レターデーション、及び前記光学フィルムの波長650nmにおける面内レターデーションであり、
Nzは前記光学フィルムのNz係数である。 The uniaxial co-stretched product of the multilayer film according to any one of claims 1 to 4, wherein the layer A is made of a crystalline resin (a) having a positive intrinsic birefringence and a material (b) having a negative intrinsic birefringence. ), Which is an optical film including a B layer.
An optical film satisfying the following formulas (5) and (6).
Re (450) <Re (550) <Re (650) ... (5)
Nz <1 ... (6)
however,
Re (450), Re (550) and Re (650) are the in-plane retardation of the optical film at a wavelength of 450 nm, the in-plane retardation of the optical film at a wavelength of 550 nm, and the optical film at a wavelength of 650 nm, respectively. It is an in-plane letteration,
Nz is the Nz coefficient of the optical film. - 長尺フィルムである、請求項5に記載の光学フィルム。 The optical film according to claim 5, which is a long film.
- 前記一軸共延伸が、縦一軸共延伸、横一軸共延伸、又は、斜め一軸共延伸である、請求項5又は6に記載の光学フィルム。 The optical film according to claim 5 or 6, wherein the uniaxial co-stretching is vertical uniaxial co-stretching, horizontal uniaxial co-stretching, or diagonal uniaxial co-stretching.
- B層の厚みが、20μm以下である、請求項5~7のいずれか1項に記載の光学フィルム。 The optical film according to any one of claims 5 to 7, wherein the thickness of the B layer is 20 μm or less.
- 1層の前記A層と、その両面に形成された2層の前記B層とを備える、請求項5~8のいずれか1項に記載の光学フィルム。 The optical film according to any one of claims 5 to 8, further comprising one layer A and two layers B formed on both sides thereof.
- 請求項1~4のいずれか1項に記載の多層フィルムの製造方法であって、
結晶性樹脂(a)からなるフィルムoAを用意する工程(I)と、
溶媒、及び前記溶媒に溶解した固有複屈折が負の材料(b)を含む液状組成物を、前記フィルムoAの片面又は両面に塗布して、それによりpB層を形成し且つ前記フィルムoAの厚み方向の複屈折を変化させpA層とし、前記pA層及び前記pB層とを備える多層フィルムを得る工程(II)と、を含む製造方法。 The method for producing a multilayer film according to any one of claims 1 to 4.
The step (I) of preparing the film oA made of the crystalline resin (a) and
A liquid composition containing a solvent and a material (b) having a negative intrinsic birefringence dissolved in the solvent is applied to one or both sides of the film oA to form a pB layer and the thickness of the film oA. A production method comprising a step (II) of obtaining a multilayer film including the pA layer and the pB layer by changing the birefringence in the direction to form a pA layer. - 請求項5~9のいずれか1項に記載の光学フィルムの製造方法であって、
結晶性樹脂(a)からなるフィルムoAを用意する工程(I)と、
溶媒、及び前記溶媒に溶解した固有複屈折が負の材料(b)を含む液状組成物を、前記フィルムoAの片面又は両面に塗布して、それによりpB層を形成し且つ前記フィルムoAの厚み方向の複屈折を変化させpA層とし、前記pA層及び前記pB層とを備える多層フィルムを得る工程(II)と、
前記多層フィルムを一軸共延伸する工程(III)と、を含む製造方法。 The method for manufacturing an optical film according to any one of claims 5 to 9.
The step (I) of preparing the film oA made of the crystalline resin (a) and
A liquid composition containing a solvent and a material (b) having a negative intrinsic birefringence dissolved in the solvent is applied to one or both sides of the film oA to form a pB layer and the thickness of the film oA. The step (II) of obtaining a multilayer film having the pA layer and the pB layer by changing the birefringence in the direction to form a pA layer.
A production method comprising the step (III) of co-stretching the multilayer film.
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