JP6027839B2 - 偏光板の製造方法 - Google Patents
偏光板の製造方法 Download PDFInfo
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- JP6027839B2 JP6027839B2 JP2012220417A JP2012220417A JP6027839B2 JP 6027839 B2 JP6027839 B2 JP 6027839B2 JP 2012220417 A JP2012220417 A JP 2012220417A JP 2012220417 A JP2012220417 A JP 2012220417A JP 6027839 B2 JP6027839 B2 JP 6027839B2
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- film
- roll
- adhesive
- active energy
- polarizing plate
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- 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
- B29D11/00634—Production of filters
- B29D11/00644—Production of filters polarizing
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1464—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1477—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier
- B29C65/1483—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier coated on the article
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
- B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
- B29C65/4845—Radiation curing adhesives, e.g. UV light curing adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
- B29C65/524—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive by applying the adhesive from an outlet device in contact with, or almost in contact with, the surface of the part to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/45—Joining of substantially the whole surface of the articles
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
- B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
- B29C66/7336—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
- B29C66/73365—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
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- B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
- B29C66/7336—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
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- B29C66/73366—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light both parts to be joined being transparent or translucent to visible light
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0066—Optical filters
-
- 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
- B32B2307/412—Transparent
-
- 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
-
- 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
- B32B2310/00—Treatment by energy or chemical effects
- B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
- B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
- B32B37/203—One or more of the layers being plastic
- B32B37/206—Laminating a continuous layer between two continuous plastic layers
-
- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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Description
(偏光フィルム)
本発明の偏光板の製造方法に用いられる偏光フィルムは、具体的には、一軸延伸したポリビニルアルコール系樹脂フィルムに二色性色素を吸着配向させたものである。ポリビニルアルコール系樹脂は、ポリビニル酢酸系樹脂をケン化することにより得られる。ポリ酢酸ビニル系樹脂としては、酢酸ビニルの単独重合体であるポリ酢酸ビニルの他に、酢酸ビニルとこれに共重合可能な他の単量体との共重合体(例えば、エチレン−酢酸ビニル共重合体)などが挙げられる。酢酸ビニルと共重合可能な他の単量体としては、他に、不飽和カルボン酸類、オレフィン類、ビニルエーテル類、不飽和スルホン酸類、アンモニウム基を有するアクリルアミド類などが挙げられる。ポリビニルアルコール系樹脂のケン化度は、85モル%以上、好ましくは90モル%以上、より好ましくは98〜100モル%である。ポリビニルアルコール系樹脂の平均重合度は、通常1000〜10000、好ましくは1500〜5000である。これらのポリビニルアルコール系樹脂は、変性されていてもよく、たとえばアルデヒド類で変性されたポリビニルホルマール、ポリビニルアセタール、ポリビニルブチラールなども使用し得る。
本発明において、上述した偏光フィルムの片面または両面には透明フィルムが貼合される。透明フィルムを構成する材料としては、たとえば、シクロオレフィン系樹脂、酢酸セルロース系樹脂、ポリエチレンテレフタレートやポリエチレンナフタレート、ポリブチレンテレフタレートのようなポリエステル系樹脂、ポリカーボネート系樹脂、アクリル系樹脂、ポリプロピレンなど、当分野において従来より広く用いられてきているフィルム材料を挙げることができる。偏光フィルムの両面に透明フィルムが貼合される場合、各々の透明フィルムは同じものであってもよく、異なる種類のフィルムであってもよい。
偏光フィルムと透明フィルムとは、活性エネルギー線硬化型の接着剤を介して貼合される。活性エネルギー線硬化型の接着剤としては、耐候性や屈折率、カチオン重合性などの観点から、活性エネルギー線の照射により硬化するエポキシ樹脂を含有するエポキシ系樹脂組成物からなる接着剤が挙げられる。ただし、これに限定されるものではなく、従来から偏光板の製造に使用されている各種の活性エネルギー線硬化型の接着剤(有機溶剤系接着剤、ホットメルト系接着剤、無溶剤型接着剤など)、たとえばアクリルアミド、アクリレート、ウレタンアクリレート、エポキシアクリレートなどのアクリル系樹脂組成物からなる接着剤などが採用可能である。
キル基を表し、rは2〜20の整数を表す)。
(i)次式(IX)で示されるエポキシシクロペンチルエーテル類:
上記例示した脂環式エポキシ樹脂の中でも、次の脂環式エポキシ樹脂は、市販されているか、またはその類似物であって、入手が比較的容易である等の理由からより好ましく用いられる。
(B)4−メチル−7−オキサビシクロ[4.1.0]ヘプタン−3−カルボン酸と(4−メチル−7−オキサ−ビシクロ[4.1.0]ヘプト−3−イル)メタノールとのエステル化物[式(I)において、R1=4−CH3、R2=4−CH3の化合物]、
(C)7−オキサビシクロ[4.1.0]ヘプタン−3−カルボン酸と1,2−エタンジオールとのエステル化物[式(II)において、R3=R4=H、n=2の化合物]、
(D)(7−オキサビシクロ[4.1.0]ヘプト−3−イル)メタノールとアジピン酸とのエステル化物[式(III)において、R5=R6=H、p=4の化合物]、
(E)(4−メチル−7−オキサビシクロ[4.1.0]ヘプト−3−イル)メタノールとアジピン酸とのエステル化物[式(III)において、R5=4−CH3、R6=4−
CH3、p=4の化合物]、
(F)(7−オキサビシクロ[4.1.0]ヘプト−3−イル)メタノールと1,2−エタンジオールとのエーテル化物[式(V)において、R9=R10=H、r=2の化合物
]。
次に図面を参照しながら本発明の偏光板の製造装置および製造方法を説明する。図1は本発明の偏光板の製造方法に用いられる製造装置の一実施形態を示す概略図である。
ム1と透明フィルム2,3とが貼合され、積層体4が形成される(貼合工程)。
透明フィルム2,3への接着剤の塗工方法は特に限定されないが、例えば、ドクターブレード、ワイヤーバー、ダイコーター、カンマコーター、グラビアコーターなど、種々の塗工方式が利用できる。このうち、薄膜塗工、パスラインの自由度、幅広への対応などを考慮すると、接着剤塗工装置11,12としてはグラビアロールが好ましい。
本工程では、ロール状に巻回された状態から連続的に繰り出された偏光フィルム1の両面に、上記工程により接着剤が塗布された透明フィルム2,3が接着剤を介して積層される。この積層体を、搬送方向に回転する一対の貼合ロール51,52の間に挟んだ状態で、例えば貼合ロール51を貼合ロール52の方向に押圧することで、偏光フィルム1と透明フィルム2,3とが貼合され、積層体4が形成される。この際、貼合ロールの押圧方向に垂直な面に対して±3°の範囲内の角度をなすように、好ましくは±1°の範囲内の角度をなすように、特に好ましくは押圧方向に垂直な面と重なるようにして偏光フィルムを貼合ロール間に搬送することが好ましい。このようにすることで、偏光フィルムと透明フィルムが貼合ロールの手前で接触して気泡が発生してしまうことがない。
回転ロール13は、外周面が鏡面仕上げされた凸曲面を構成しており、その表面に積層体4を密着させながら搬送し、その過程で活性エネルギー線照射装置31,32により接着剤を重合硬化させる。接着剤を重合硬化させ、積層体4を充分に密着させる上で、回転ロール13の直径は特に限定されない。回転ロール13は、一対の貼合ロール51,52の内、回転駆動されるゴムロールの回転速度より速い回転速度で駆動されるものとする。一対の貼合ロール51,52の内、回転駆動されるゴムロールの回転速度を100とすると、回転ロール13の回転速度は100.1以上かつ102.0以下であることが好ましく、より好ましくは100.1〜101.5である。100.1未満であると、積層体にウェーブカールが発生しやすくなる。一方、102.0を超えると、フィルムとロールの間が滑ってすりキズなどが入る可能性がある。
活性エネルギー線照射装置31,32による活性エネルギー線の積算光量が不十分な場合は、さらに第2以降の活性エネルギー線照射装置16〜18を設け、活性エネルギー線を追加照射させ、積層体4の接着剤の硬化を促進することが好ましい。第1の活性エネルギー線照射工程とあわせた全工程における積算光量が10mJ/cm2以上、特に10〜5,000mJ/cm2となるように設定されることが好ましい。上記接着剤への積算光量が10mJ/cm2未満であると、開始剤由来の活性種の発生が十分でなく、接着剤の硬化が不十分となる。一方でその積算光量が5,000mJ/cm2を超えると、照射時間が非常に長くなり、生産性向上には不利なものとなる。この際、使用するフィルムや接着剤種の組み合わせなどによって、どの波長領域(UVA(320〜390nm)やUVB(280〜320nm)など)での積算光量が必要かは異なる。
積層体(偏光板)4を巻き取る張力を30N/cm2〜150N/cm2とする。好ましくは、30N/cm2〜120N/cm2である。30N/cm2未満では長尺のロール巻きを移送する際、巻きズレが起きるため好ましくない。150N/cm2より大きい場合は、巻き締まりが強く、タルミが発生し易い。
(偏光フィルムの作製)
ポリビニルアルコールの原反フィルムとしては、重合度2400、ケン化度99.9モル%、厚み75μm、幅3000mmの長尺のポリビニルアルコールフィルム「OPLフィルム M−7500(日本合成製)」を用いた。延伸は、処理槽前後の駆動ニップロールに周速差をつけて行った。
透明フィルムとして、厚さ40μmの位相差特性が付与された酢酸セルロール系樹脂フィルム「KC4CR−1(コニカミノルタオプト(株)製)」と、厚さ80μmのトリアセチルセルロースフィルム「KC8UX2MW」(コニカミノルタ社製)とを準備した。
上記のように作製された実施例1の偏光板について、蛍光灯を当てた反射検査にて外観を観察したところ、波板状うねりの発生は確認されなかった。
透明フィルムとして、酢酸セルロール系樹脂フィルム「KC4CR−1」に代えて厚さ60μmのシクロオレフィン系樹脂フィルム「ゼオノア(ZEONOR)」(日本ゼオン(株)製)を用いた点以外は、実施例1と同様に実施例2の偏光板を作製した。
上記のように作製された実施例2の偏光板について、実施例1と同様に外観を観察したところ、波板状うねりの発生は確認されなかった。
透明フィルムとして、酢酸セルロール系樹脂フィルム「KC4CR−1」に代えて厚さ25μmのシクロオレフィン系樹脂フィルム「ゼオノア(ZEONOR)」(日本ゼオン(株)製)を、トリアセチルセルロースフィルム「KC8UX2MW」に代えて厚さ25μmのトリアセチルセルロースフィルム「K2UAW」(コニカミノルタ社製)を用い、貼合工程において駆動回転されるゴムロールの回転速度を25.00m/分、冷却ロールの回転速度を25.08m/分とした。すなわち、ゴムロールの回転速度を100とすると、冷却ロールの回転速度は100.3であった。これらの点以外は、実施例1と同様に実施例3の偏光板を作製した。
上記のように作製された実施例3の偏光板について、実施例1と同様に外観を観察したところ、波板状うねりの発生は確認されなかった。
透明フィルムとして、酢酸セルロール系樹脂フィルム「KC4CR−1」に代えて厚さ50μmのシクロオレフィン系樹脂フィルム「ゼオノア(ZEONOR)」(日本ゼオン(株)製)を、トリアセチルセルロースフィルム「KC8UX2MW」に代えて厚さ60μmのトリアセチルセルロースフィルム「TD60UL」(富士フィルム(株)製)を用い、貼合工程において駆動回転されるゴムロールの回転速度を25.00m/分、冷却ロールの回転速度を25.28m/分とした。すなわち、ゴムロールの回転速度を100とすると、冷却ロールの回転速度は101.1であった。これらの点以外は、実施例1と同様に実施例4の偏光板を作製した。
上記のように作製された実施例4の偏光板について、実施例1と同様に外観を観察したところ、波板状うねりの発生は確認されなかった。
冷却ロールの回転速度を、貼合工程において駆動回転されるゴムロールの回転速度100に対して102.2としたこと以外は、実施例1と同様に偏光板を作製した。
上記のように作製された実施例5の偏光板について、外観を観察したところ、波板状うねりの発生は確認されなかったものの、擦り傷の発生が確認された。
冷却ロールの回転速度は、貼合工程において駆動回転されるゴムロールの回転速度100に対して100、すなわち同じ回転速度とした点以外は、実施例1と同様に比較例1の偏光板を作製した。
上記のように作製された比較例1の偏光板について、外観を観察したところ、波板状うねりの発生が確認された。
Claims (3)
- 偏光フィルムの片面または両面に透明フィルムが貼合されてなる偏光板の製造方法であって、
前記透明フィルムの片面または前記偏光フィルムの片面もしくは両面に、活性エネルギー線硬化型の接着剤を塗布する接着剤塗布工程と、
前記透明フィルムが前記偏光フィルムの片面または両面に前記接着剤を介して積層されてなる積層体を、搬送方向に回転する一対の貼合ロールの間に挟み前記積層体に圧力を加えることで前記透明フィルムと前記偏光フィルムとを貼合する貼合工程と、
前記積層体を、外周面が鏡面仕上げされ、搬送方向に回転駆動される、回転ロールに密着させた状態で搬送する間に、前記積層体に活性エネルギー線を照射して前記接着剤を硬化させる第1の活性エネルギー線照射工程とをこの順で備え、
前記一対の貼合ロールの少なくとも一方は、ゴムからなる表面を有し回転駆動されるゴムロールであり、
前記回転ロールの回転速度は、前記ゴムロールの回転速度より速い、偏光板の製造方法。 - 前記回転ロールは冷却ロールである、請求項1に記載の偏光板の製造方法。
- 前記回転ロールの回転速度は、前記ゴムロールの回転速度を100とすると100.1以上かつ102.0以下である、請求項1または2に記載の偏光板の製造方法。
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