TWI768007B - Laminated body and method for producing the same - Google Patents
Laminated body and method for producing the same Download PDFInfo
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- TWI768007B TWI768007B TW107108930A TW107108930A TWI768007B TW I768007 B TWI768007 B TW I768007B TW 107108930 A TW107108930 A TW 107108930A TW 107108930 A TW107108930 A TW 107108930A TW I768007 B TWI768007 B TW I768007B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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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
- 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
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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
- 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
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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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
- 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
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
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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
- 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
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
- B32B2037/243—Coating
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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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0076—Curing, vulcanising, cross-linking
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/418—Refractive
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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
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
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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
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
- Laminated Bodies (AREA)
Abstract
Description
本發明有關層合體以及層合體之製造方法。 The present invention relates to a laminate and a method for producing the laminate.
尤其有關藉由上覆層合薄膜層合由光擴散控制薄膜用組成物所成之塗佈層之狀態下進行光硬化所得之光擴散控制薄膜與上覆層合薄膜之層合體，係光擴散控制薄膜之光擴散特性不管薄膜面內之部位為何而均為均一的層合體、以及有關此等層合體之製造方法。 In particular, it relates to a laminate of a light-diffusion control film and an overlying laminated film obtained by photohardening in a state where a coating layer formed of a composition for a light-diffusion control film is laminated by an overlying laminated film, which is a light-diffusion control film. The light-diffusion properties of the control film are uniform regardless of the location in the film plane, and a laminate is also related to the production method of the laminate.
以往，於例如液晶顯示裝置或投影螢幕等所屬之光學技術領域中，提案使用光擴散控制薄膜。 Conventionally, in the optical technology field to which a liquid crystal display device, a projection screen, etc. belong, it is proposed to use a light-diffusion control film.
該光擴散控制薄膜具有如下之光擴散特性者：於特定入射角度範圍(以下有時稱為「光擴散入射角度區域」)時顯示一定之光擴散狀態，於偏離光擴散入射角度區域之入射角度範圍，使入射光直接透過，或顯示與在光擴散入射角度區域之光擴散狀態不同之光擴散狀態。 The light-diffusion control film has the following light-diffusion characteristics: it exhibits a certain light-diffusion state in a specific incident angle range (hereinafter sometimes referred to as "light-diffusion incident-angle region"), and at an incident angle deviating from the light-diffusion incident angle region range, allowing the incident light to pass through directly, or showing a light diffusion state different from the light diffusion state in the light diffusion incident angle region.
作為此等光擴散控制薄膜，已知有多種態 樣，尤其已廣泛使用於薄膜內具有於折射率相對低之區域中林立有折射率相對高的複數柱狀物而成之柱構造的光擴散控制薄膜。 As such light-diffusion control films, various forms are known. In this way, it has been widely used in a light-diffusion control film having a pillar structure in which a plurality of pillars having a relatively high refractive index are lined up in a region with a relatively low refractive index in the film.
又，作為其他類型之光擴散控制薄膜，已廣泛使用具有於薄膜內，於沿薄膜面沿任意一方向相互配置折射率不同之複數板狀區域而成之百葉窗構造之光擴散控制薄膜。 In addition, as other types of light diffusion control films, light diffusion control films having a louver structure in which a plurality of plate-like regions with different refractive indices are mutually arranged in any direction along the film surface in the film have been widely used.
不過，具有此等柱構造或百葉窗構造之光擴散控制薄膜，已知係藉由對於將含有折射率不同之2種以上的聚合性化合物之光擴散控制薄膜用組成物塗佈成膜狀之塗佈層，以特定方法照射活性能量線而獲得。 However, the light-diffusion control film having such a column structure or a louver structure is known to be obtained by coating a composition for light-diffusion control film containing two or more types of polymerizable compounds having different refractive indices into a film. The cloth layer is obtained by irradiating active energy rays in a specific method.
亦即，藉由對塗佈層照射經控制行進方向之特定活性能量線，邊使塗佈層中之2種以上之聚合性化合物相分離邊硬化，可獲得具有特定內部構造之光擴散控制薄膜。 That is, by irradiating the coating layer with a specific active energy ray whose traveling direction is controlled, two or more polymerizable compounds in the coating layer are hardened while phase-separating, and a light diffusion control film with a specific internal structure can be obtained. .
然而，對於塗佈層直接照射特定活性能量線時，見到難以於薄膜膜厚方向全面，亦即直至薄膜上面形成特定之內部構造之問題。 However, when the coating layer is directly irradiated with specific active energy rays, it is difficult to form a specific internal structure on the entire surface of the film in the thickness direction of the film, that is, until the upper surface of the film.
亦即，雖可於薄膜膜厚方向之下方部分形成特定之內部構造，但見到於上方部分會發生未形成內部構造之區域的問題。 That is, although a specific internal structure can be formed in the lower part in the film thickness direction, the problem that a region where the internal structure is not formed is seen in the upper part.
因此，揭示有不發生未形成內部構造之區域而用以直至薄膜上面形成特定之內部構造的技術(例如參考專利文獻1)。 Therefore, there is disclosed a technique for forming a specific internal structure up to the upper surface of a thin film without generating a region where the internal structure is not formed (for example, refer to Patent Document 1).
亦即，專利文獻1中，揭示擴散性根據光之入
射角而變化之異向性光學薄膜之製造方法，其特徵係包含下述步驟：於光硬化性之未硬化樹脂組成物層之一面上，接合濁度值為1.0~50.0%之光照射遮罩之光照射遮罩接合步驟，於光照射遮罩接合步驟後，藉由透過光照射遮罩照射光而使未硬化樹脂組成物層硬化而形成異向性擴散層之硬化步驟。
That is, in
又，亦記載有光照射遮罩之表面粗糙度為0.05~0.50μm，或光照射遮罩之氧透過係數為1.0×10-11cm3(STP)cm/(cm2．s．Pa)以下。 In addition, it is also described that the surface roughness of the light irradiation mask is 0.05 to 0.50 μm, or the oxygen transmission coefficient of the light irradiation mask is 1.0×10 −11 cm 3 (STP) cm/(cm 2 ·s·Pa) or less. .
亦即，對於由光擴散控制薄膜用組成物所成之塗佈層，以層合特定上覆層合薄膜之狀態進行光硬化，而抑制發生未形成內部構造之區域。 That is, with respect to the coating layer formed of the composition for a light-diffusion control film, photocuring is performed in a state where a specific overlying laminate film is laminated, and the occurrence of a region where the internal structure is not formed is suppressed.
[專利文獻1]日本特開2016-194687號公報(申請專利範圍) [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-194687 (Patent Application Scope)
然而，即使使用專利文獻1中記載之光照射遮罩之情況，亦難以穩定地抑制未形成內部構造之區域發生。
However, even in the case of using the light irradiation mask described in
尤其，於有某寬度之1片連續之光擴散控制薄膜中，見到未發生未形成內部構造之區域之部位，亦見到發生之部位。由此，薄膜面內之光擴散特性亦因光之入射部位而 變化，而於全體見到光擴散特性變不均一之問題。 In particular, in one continuous light-diffusion control film having a certain width, there were no occurrences of regions where the internal structure was not formed, and occurrences were also observed. As a result, the in-plane light diffusion characteristics of the film are also affected by the incident portion of the light. change, and the problem that the light diffusion characteristic becomes non-uniform is seen in the whole.
因此，本發明人等鑑於如以上之情況而積極努力後，發現藉由將沿上覆層合薄膜面內之特定方向測定的慢軸方向之配向角的偏差設為特定範圍內之值，即使於未發生未形成內部構造之區域時，或即使發生時，內部構造均可均一形成，因而完成本發明。 Therefore, the present inventors, after vigorous efforts in view of the above situation, found that by setting the deviation of the alignment angle in the slow axis direction measured along a specific direction in the surface of the overlying laminate film to a value within a specific range, even if When the region where the internal structure is not formed does not occur, or even when it occurs, the internal structure can be uniformly formed, thereby completing the present invention.
亦即，本發明之目的在於提供藉由上覆層合薄膜層合由光擴散控制薄膜用組成物所成之塗佈層之狀態下進行光硬化所得之光擴散控制薄膜與上覆層合薄膜之層合體，係光擴散控制薄膜之光擴散特性不管薄膜面內之部位為何而均為均一的層合體、以及有關此等層合體之製造方法。 That is, the object of the present invention is to provide a light-diffusion control film and an overlying laminated film obtained by photohardening in a state where an overlying laminated film is laminated with a coating layer formed of a composition for a light-diffusion control film. The laminated body is a laminated body in which the light-diffusion property of the light-diffusion control film is uniform regardless of the position in the film surface, and a manufacturing method of the laminated body.
依據本發明，提供如下之層合體，而可解決上述問題，該層合體之特徵係於光擴散控制薄膜之至少一面上將上覆層合薄膜作為層合狀態之層合體，且光擴散控制薄膜具有於低折射率區域中具有複數高折射率區域，且該高折射率區域具有往厚度方向延伸而成之內部構造，同時將沿上覆層合薄膜之短邊方向測定並以長邊方向為基準之慢軸方向的配向角
亦即，依據本發明之層合體，由於將沿上覆層合薄膜面內之特定方向測定的慢軸方向之配向角
又，構成本發明之層合體時，上覆層合薄膜之短邊方向之長度較好為100~10000mm之範圍內之值。 Moreover, when forming the laminate of the present invention, the length in the transversal direction of the overlying laminate film is preferably a value within the range of 100 to 10,000 mm.
藉由如此構成，可獲得短邊方向之長度充分的層合體，進而可獲得短邊方向之長度充分的光擴散控制薄膜。 With such a configuration, a laminate having a sufficient length in the short-side direction can be obtained, and further, a light-diffusion control film having a sufficient length in the short-side direction can be obtained.
又，構成本發明之層合體時，上覆層合薄膜之慢軸方向之配向角
藉由如此構成，可有效地抑制光擴散控制薄膜中發生未形成內部構造之區域。 With this configuration, it is possible to effectively suppress the occurrence of a region in which the internal structure is not formed in the light-diffusion control film.
又，構成本發明之層合體時，上覆層合薄膜之膜厚較好為5~5000μm之範圍內之值。 Moreover, when forming the laminate of the present invention, the thickness of the overlying laminate film is preferably a value within the range of 5 to 5000 μm.
藉由如此構成，可獲得進而安定地滿足關係式(1)之上覆層合薄膜。 With this configuration, an overlying laminate film that satisfies the relational expression (1) can be obtained in a stable manner.
又，構成本發明之層合體時，作為光擴散控制薄膜之內部構造，較好包含於折射率相對低之區域中，於薄膜膜厚方向林立有折射率相對較高之複數柱狀物而成之柱構造。 In addition, when the laminate of the present invention is formed, the internal structure of the light diffusion control film is preferably included in a region with a relatively low refractive index, and a plurality of pillars with a relatively high refractive index are lined up in the film thickness direction. pillar structure.
藉由如此構成，可獲得具有等向性之光擴散特性之光擴散控制薄膜。 With this configuration, a light-diffusion control film having isotropic light-diffusion properties can be obtained.
又，構成本發明之層合體時，作為光擴散控制薄膜之內部構造，較好包含於沿薄膜面之任意一方向交 替配置折射率不同之複數板狀區域而成之百葉窗構造。 In addition, when forming the laminate of the present invention, the internal structure of the light-diffusion control film is preferably included in an intersection along any one direction of the film surface. A louver structure formed by arranging a plurality of plate-like regions with different refractive indices.
藉由如此構成，可獲得具有異向性之光擴散特性之光擴散控制薄膜。 With this configuration, a light-diffusion control film having anisotropic light-diffusion properties can be obtained.
又，本發明之另一態樣係一種層合體之製造方法，其特徵係上述之層合體之製造方法，且包含下述步驟(a)~(d)，(a)準備包含高折射率活性能量線硬化成分及低折射率活性能量線硬化成分之光擴散控制薄膜用組成物之步驟，(b)對步驟薄片膜狀塗佈光擴散控制薄膜用組成物而形成塗佈層之步驟，(c)對於塗佈層之露出面層合滿足關係式(1)之上覆層合薄膜之步驟，(d)邊使塗佈層移動，邊透過前述上覆層合薄膜，對該塗佈層照射活性能量線之步驟。 In addition, another aspect of the present invention is a method for producing a laminate, which is characterized by the above-mentioned method for producing a laminate, and comprises the following steps (a) to (d), (a) preparing a high-refractive-index activity The step of forming the composition for a light diffusion control film of the energy ray hardening component and the low refractive index active energy ray hardening component, (b) the step of coating the composition for a light diffusion control film on a sheet film to form a coating layer, ( c) The step of laminating the overlying laminated film on the exposed surface of the coating layer that satisfies the relation (1), (d) while moving the coating layer, passing through the above-mentioned overlying laminated film, to the coating layer The step of irradiating active energy rays.
亦即，依據本發明之層合體之製造方法，由於將沿上覆層合薄膜面內之特定方向測定的慢軸方向之配向角
1:塗佈層 1: coating layer
2:步驟薄片 2: Step Flakes
10:光擴散控制薄膜 10: Light Diffusion Control Film
10a:等向性光擴散控制薄膜 10a: Isotropic light diffusion control film
10b~10d:光擴散控制薄膜 10b~10d: Light Diffusion Control Film
12、12b~12d:折射率相對較高的區域(包含折射率相對較高的板狀區域) 12, 12b~12d: areas with relatively high refractive index (including plate-like areas with relatively high refractive index)
12a:折射率相對較高的柱狀物 12a: Pillars with relatively high refractive index
14、14a~14d:折射率相對較低的區域(包含折射率相對較低的板狀區域) 14, 14a~14d: Regions with relatively low refractive index (including plate-like regions with relatively low refractive index)
16:彎曲部 16: Bending part
20:內部構造 20: Internal structure
20a’:邊界面 20a’: Boundary interface
20a:柱構造 20a: Column construction
20b:百葉窗構造 20b: Shutter construction
20c:彎曲柱構造 20c: Curved Column Construction
20d:特定內部構造 20d: specific internal structure
52、54:入射光 52, 54: Incident light
52’、54’:特定擴散光 52', 54': specific diffused light
56:入射光 56: Incident light
56’:透過光 56': Through Light
60:平行光 60: Parallel light
70:來自點光源之放射光 70: Emitted light from a point light source
100:層合體 100: Laminate
102:點光源 102: Point Lights
104:透鏡 104: Lens
圖1(a)~(b)係供於用以說明本發明之層合體概略的 圖。 1(a) to (b) are schematic diagrams for explaining the laminate of the present invention picture.
圖2係供於用以說明上覆層合薄膜中之配向角
圖3(a)~(b)係供於用以說明於薄膜內具有柱構造之光擴散控制薄膜之概略的圖。 FIG.3(a)-(b) is a figure for demonstrating the outline of the light-diffusion control film which has a pillar structure in a film.
圖4(a)~(b)係供於用以說明於薄膜內具有柱構造之光擴散控制薄膜中入射角度依存性及等向性光擴散的圖。 FIGS. 4( a ) to ( b ) are diagrams for explaining the incident angle dependence and the isotropic light diffusion in the light diffusion control film having a column structure in the film.
圖5(a)~(d)係供於用以說明本發明之光擴散控制薄膜中之內部構造態樣的圖。 FIGS. 5( a ) to ( d ) are diagrams for explaining the internal structure of the light diffusion control film of the present invention.
圖6(a)~(c)係供於用以說明本發明之層合體之製造方法的圖。 FIG.6(a)-(c) is a figure for demonstrating the manufacturing method of the laminated body of this invention.
圖7係供於用以說明活性能量線之照射角的圖。 FIG. 7 is a diagram for explaining irradiation angles of active energy rays.
圖8係供於用以顯示實施例1~2及比較例1中之上覆層合薄膜之短邊方向之位置與配向角
圖9(a)~(c)係供於用以顯示實施例1~2及比較例1中之光擴散控制薄膜之剖面照片的圖。 FIGS. 9( a ) to ( c ) are diagrams for showing cross-sectional photographs of the light diffusion control films in Examples 1 to 2 and Comparative Example 1. FIGS.
圖10(a)~(b)係供於用以顯示實施例1~2及比較例1中之參考光對於光擴散控制薄膜之入射角度與變角濁度之關係的圖。 FIGS. 10( a ) to ( b ) are graphs for showing the relationship between the incident angle of the reference light on the light diffusion control film and the variable angle haze in Examples 1 to 2 and Comparative Example 1. FIGS.
圖11(a)~(b)係供於用以顯示實施例1~2及比較例1中之光擴散控制薄膜之短邊方向的位置與直進透過光強度P.T之關係的圖。 FIGS. 11( a ) to ( b ) are diagrams for showing the relationship between the positions in the short-side direction of the light-diffusion control films in Examples 1 to 2 and Comparative Example 1 and the straight transmitted light intensity P.T.
本發明之第1實施形態係如圖1(a)所示，於光擴散控制薄膜10之至少一面上層合上覆層合薄膜4之狀態的層合體100。
The first embodiment of the present invention is a laminate 100 in a state where the
而且，係如下特徵之層合體：光擴散控制薄膜10具有於低折射率區域14中具有複數高折射率區域12，且該高折射率區域12於厚度方向延伸之內部構造20，如圖1(b)所示，將使源自光擴散控制薄膜用組成物之塗佈層1光硬化時該塗佈層1之移動方向MD設為長邊方向LD，將薄膜面內且與長邊方向LD垂直方向設為短邊方向SD，且如圖2所示，將沿上覆層合薄膜4之短邊方向SD測定之以長邊方向MD為基準之慢軸方向的配向角
亦即，係如下特徵之層合體：於光擴散控制薄膜(異向性光擴散控制薄膜等)10之至少一面上層合上覆層合薄膜4之層合體100，且光擴散控制薄膜10係包含高折射率活性能量線硬化成分及低折射率活性能量線硬化成分之光擴散控制薄膜用組成物的光硬化物，於薄膜內具有於折射率相對較低之區域14中具有複數折射率相對較高之區域12之內部構造20，並且使源自光擴散控制薄膜用組成物之塗佈層1光硬化時之該塗佈層1之移動方向MD設為長邊方向LD，將薄膜面內且與長邊方向LD垂直方向設為短邊
方向SD，且如圖2所示，將沿上覆層合薄膜4之短邊方向SD測定且以長邊方向MD為基準之慢軸方向的配向角
以下，參考適當圖式具體說明本發明之第1實施形態。 Hereinafter, the first embodiment of the present invention will be specifically described with reference to appropriate drawings.
但，關於「光擴散控制薄膜用組成物」及其「光硬化」係於第2實施形態中說明。 However, "the composition for light-diffusion control films" and its "photocuring" are described in the second embodiment.
本發明之上覆層合薄膜係如圖1(b)所示，使源自光擴散控制薄膜用組成物之塗佈層1光硬化時之該塗佈層1之移動方向MD設為長邊方向LD，將薄膜面內且與長邊方向LD垂直方向設為短邊方向SD，且如圖2所示，將沿上覆層合薄膜4之短邊方向SD測定之以長邊方向LD為基準之慢軸方向的配向角
其理由為若關係式(1)之左邊表示之配向角
因此，關係式(1)之左邊表示之配向角
且，關係式(1)之左邊表示之配向角
因此，關係式(1)之左邊表示之配向角
又，算出配向角
又，如由圖1(b)所明瞭，上覆層合薄膜之長邊方向LD及短邊方向SD與光擴散控制薄膜之長邊方向LD及短邊方向SD一致。 Moreover, as is clear from FIG. 1( b ), the long-side direction LD and the short-side direction SD of the overlying laminate film coincide with the long-side direction LD and the short-side direction SD of the light-diffusion control film.
又，配向角
此處，針對上覆層合薄膜之配向角
亦即，認為所照射之活性能量線之振動方向與所形成之折射率分佈構造有密切關係。 That is, it is considered that the vibration direction of the irradiated active energy rays is closely related to the refractive index distribution structure formed.
活性能量線照射於上覆層合薄膜時，根據上覆層合薄膜之配向軸
因此，認為配向角
又，上覆層合薄膜之慢軸方向之配向角
其理由為若配向角
另一方面，若配向角
因此，配向角
又，配向角
又，上覆層合薄膜之活性能量線照射側表面之算術平均粗糙度(Ra)較好為1~200nm之範圍內之值。 Further, the arithmetic mean roughness (Ra) of the active energy ray-irradiated side surface of the overlying laminate film is preferably a value within a range of 1 to 200 nm.
若該Ra成為未達1nm之值，則上覆層合薄膜捲出時，會有該薄膜彼此密著，剝離時之振動變大之情況。因此有該振動傳導至活性能量線照射部分，而使光擴散控制薄膜 之內部構造形成精度降低之虞。 When the Ra is a value of less than 1 nm, when the overlying laminate film is rolled out, the films may adhere to each other and the vibration at the time of peeling may increase. Therefore, the vibration is transmitted to the active energy ray irradiated portion, and the light diffusion control film is The internal structure creates a risk of reducing the accuracy.
另一方面，若該Ra成為超過200nm之值，則由於表面形狀過大，故有活性能量線產生擴散而對構造形成造成阻礙之情況之故。 On the other hand, when this Ra becomes a value exceeding 200 nm, since the surface shape becomes too large, an active energy ray spread|diffusion and it may hinder structure formation.
因此，上覆層合薄膜之算術平均粗糙度(Ra)之下限值更好為5nm以上之值，又更好為10nm以上之值。 Therefore, the lower limit value of the arithmetic mean roughness (Ra) of the overlying laminate film is more preferably a value of 5 nm or more, and more preferably a value of 10 nm or more.
且，上覆層合薄膜之算術平均粗糙度(Ra)之上限值更好為100nm以下之值，又更好為40nm以下之值，特佳為30nm以下。 Furthermore, the upper limit value of the arithmetic mean roughness (Ra) of the overlying laminate film is more preferably a value of 100 nm or less, more preferably a value of 40 nm or less, and particularly preferably 30 nm or less.
又，作為表面粗糙度之一的算術平均粗糙度(Ra)可依據JIS B 0601：2001，以與其吻合之方式測定，亦可依據ANSI B46.1測定。 In addition, the arithmetic mean roughness (Ra) which is one of the surface roughnesses can be measured according to JIS B 0601:2001, and can be measured according to ANSI B46.1.
又，上覆層合薄膜之最大***(Rp)較好為20~5000nm之範圍內之值。 Further, the maximum protuberance (Rp) of the overlying laminate film is preferably a value within a range of 20 to 5000 nm.
其理由為該Rp若成為未達20nm之值，則上覆層合薄膜捲出時，有該薄膜彼此密著，剝離時之振動變大之情況。因此，有該振動傳導至活性能量線照射部分，而使光擴散控制薄膜之內部構造形成精度降低之虞。另一方面，若該Rp成為超過5000nm之值，則由於表面形狀過大，故有活性能量線產生擴散而對構造形成造成阻礙之情況之故。 The reason for this is that when the Rp becomes a value of less than 20 nm, when the overlying laminate film is rolled out, the films may adhere to each other and the vibration at the time of peeling may increase. Therefore, the vibration is transmitted to the active energy ray irradiated portion, and there is a possibility that the formation accuracy of the internal structure of the light-diffusion control film may be lowered. On the other hand, when this Rp has a value exceeding 5000 nm, since the surface shape is too large, the active energy rays may diffuse and hinder the formation of the structure.
因此，上覆層合薄膜之最大***(Rp)之下限值更好為50nm以上之值，又更好為100nm以上之值，特佳為300nm以上。 Therefore, the lower limit value of the maximum protuberance (Rp) of the overlying laminate film is more preferably a value of 50 nm or more, more preferably a value of 100 nm or more, and particularly preferably 300 nm or more.
且，上覆層合薄膜之最大***(Rp)之上限值更好為2000nm以下之值，又更好為1000nm以下之值，特佳為600nm以下。 Furthermore, the upper limit value of the maximum protuberance (Rp) of the overlying laminate film is more preferably a value of 2000 nm or less, more preferably a value of 1000 nm or less, and particularly preferably 600 nm or less.
又，作為表面粗糙度之一的最大***(Rp)可依據JIS B 0601：2001，以與其吻合之方式測定，亦可依據ANSI B46.1測定。 In addition, the maximum protuberance (Rp) which is one of the surface roughnesses can be measured according to JIS B 0601:2001, and can be measured according to ANSI B46.1.
又，上覆層合薄膜之濁度較好成為1~25%之範圍內之值。 Further, the haze of the overlying laminate film is preferably a value within the range of 1 to 25%.
其理由為若濁度成為未達1%之值，則上覆層合薄膜捲出時，有該薄膜彼此密著，剝離時之振動變大之情況。因此，有該振動傳導至活性能量線照射部分，而使光擴散控制薄膜之內部構造形成精度降低之虞。 The reason for this is that when the haze becomes a value of less than 1%, when the overlying laminate film is rolled out, the films may adhere to each other and the vibration at the time of peeling may increase. Therefore, the vibration is transmitted to the active energy ray irradiated portion, and there is a possibility that the formation accuracy of the internal structure of the light-diffusion control film may be lowered.
另一方面，若濁度成為超過25%之值，則由於表面形狀過大，故有活性能量線產生擴散而對構造形成造成阻礙之情況之故。 On the other hand, when the haze becomes a value exceeding 25%, since the surface shape is too large, the active energy rays are diffused and the formation of the structure may be hindered.
因此，上覆層合薄膜之濁度之下限值更好為3%以上之值，又更好為5%以上之值。 Therefore, the lower limit value of the haze of the overlying laminate film is more preferably a value of 3% or more, and more preferably a value of 5% or more.
且，上覆層合薄膜之濁度之上限值更好為20%以下之值，又更好為15%以下之值。 Furthermore, the upper limit value of the haze of the overlying laminate film is more preferably a value of 20% or less, and more preferably a value of 15% or less.
又，上覆層合薄膜之全光線透過率較好成為70~97%之範圍內之值。 In addition, the total light transmittance of the overlying laminate film is preferably a value within the range of 70 to 97%.
其理由為若該全光線透過率成為未達70%之值，則活性能量線之透過性過於降低，而有難以效率良好地形成光擴散控制薄膜中之特定內部構造之情況。 The reason for this is that when the total light transmittance is less than 70%, the transmittance of active energy rays is too low, and it may be difficult to efficiently form a specific internal structure in the light diffusion control film.
另一方面，若該全光線透過率成為超過97%之值，則有材料選擇幅度過於受到限制之情況。 On the other hand, if the total light transmittance exceeds 97%, the range of material selection may be too limited.
因此，上覆層合薄膜之全光線透過率之下限值更好為75%以上之值，又更好為80%以上之值。 Therefore, the lower limit value of the total light transmittance of the overlying laminate film is more preferably a value of 75% or more, and more preferably a value of 80% or more.
且，上覆層合薄膜之全光線透過率之上限值更好為95%以下之值，又更好為93%以下之值。 Furthermore, the upper limit value of the total light transmittance of the overlying laminate film is more preferably a value of 95% or less, and more preferably a value of 93% or less.
又，作為上覆層合薄膜之材料並未特別限制，但舉例為聚對苯二甲酸乙二酯薄膜、三乙醯基纖維素薄膜、環烯烴聚合物薄膜、環狀烯烴薄膜、離子聚合物薄膜、聚乙烯薄膜、聚氯乙烯薄膜、聚偏氯乙烯薄膜、聚乙烯醇薄膜、聚丙烯薄膜、聚酯薄膜、聚碳酸酯薄膜、聚苯乙烯薄膜、聚丙烯腈薄膜、乙烯乙酸乙烯酯共聚物薄膜、乙烯-乙烯醇共聚物薄膜、乙烯-甲基丙烯酸共聚物薄膜、尼龍薄膜、賽璐吩等，可單獨使用該等中之1種，亦可組合2種以上使用。 Also, the material of the upper laminated film is not particularly limited, but exemplified by polyethylene terephthalate film, triacetyl cellulose film, cyclic olefin polymer film, cyclic olefin film, ionomer Film, polyethylene film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, polypropylene film, polyester film, polycarbonate film, polystyrene film, polyacrylonitrile film, ethylene vinyl acetate copolymer A polymer film, an ethylene-vinyl alcohol copolymer film, an ethylene-methacrylic acid copolymer film, a nylon film, cellophene, etc., may be used alone or in combination of two or more.
其理由為若為該等材料，則可更穩定地獲得滿足關係式(1)之上覆層合薄膜之故。 The reason for this is that with these materials, the overlying laminate film satisfying the relational expression (1) can be obtained more stably.
又，上覆層合薄膜之短邊方向之長度(寬)較好成為100~10000mm之範圍內之值。 Moreover, it is preferable that the length (width) in the transversal direction of the overlying laminate film is a value within the range of 100 to 10000 mm.
其理由為該短邊方向之長度成為未達100mm之值時，構成層合體之光擴散控制薄膜之短邊方向之長度亦成為未達100mm之值，而有使光擴散控制薄膜不滿足實用上要求之尺寸的情況。 The reason for this is that when the length in the short-side direction is less than 100 mm, the length in the short-side direction of the light-diffusion control film constituting the laminate also becomes a value of less than 100 mm, which may make the light-diffusion control film unsatisfactory for practical use. the required size.
另一方面，該短邊方向之長度成為超過10000mm之值 時，有難以於寬度方向均一照射活性能線之情況。 On the other hand, the length in the short-side direction becomes a value exceeding 10000 mm At the time, it may be difficult to irradiate the active energy rays uniformly in the width direction.
因此，上覆層合薄膜之短邊方向之長度之下限值更好為200mm以上之值，又更好為300mm以上之值，特佳為600mm以上之值。 Therefore, the lower limit value of the length in the transversal direction of the overlying laminate film is more preferably a value of 200 mm or more, more preferably a value of 300 mm or more, and particularly preferably a value of 600 mm or more.
又，上覆層合薄膜之短邊方向之長度之上限值更好為8000mm以下之值，又更好為6000mm以下之值，特佳為3000mm以下之值。 Moreover, the upper limit value of the length in the transversal direction of the overlying laminate film is more preferably a value of 8000 mm or less, more preferably a value of 6000 mm or less, and particularly preferably a value of 3000 mm or less.
又，上覆層合薄膜之膜厚較好成為5~5000μm之範圍內之值。 Moreover, it is preferable that the film thickness of an upper cladding laminated film shall be a value within the range of 5-5000 micrometers.
其理由為該膜厚成為未達5μm之值時，處理變難，上覆層合薄膜貼合時有產生皺摺之情況之故。 The reason for this is that when the film thickness is a value of less than 5 μm, handling becomes difficult, and wrinkles may occur when the overlying laminate film is bonded.
另一方面，該膜厚成為超過5000μm之值時，處理變難，上覆層合薄膜搬送時有產生皺摺之情況之故。 On the other hand, when the film thickness exceeds 5000 μm, handling becomes difficult, and wrinkles may occur when the overlying laminate film is conveyed.
因此，上覆層合薄膜之膜厚之下限值更好為10μm以上之值，又更好為30μm以上之值。 Therefore, the lower limit value of the film thickness of the overlying laminate film is more preferably a value of 10 μm or more, and more preferably a value of 30 μm or more.
又，上覆層合薄膜之膜厚之上限值更好為1000μm以下之值，又更好為400μm以下之值，再更佳為100μm以下之值。 Moreover, the upper limit value of the film thickness of the overlying laminate film is more preferably a value of 1000 μm or less, still more preferably a value of 400 μm or less, and still more preferably a value of 100 μm or less.
又，上覆層合薄膜之兩面中，與光擴散控制薄膜接觸之側的面亦可塗佈聚矽氧樹脂等之剝離劑而設置剝離層。 In addition, a release agent such as polysiloxane may be coated on the surface of the upper cover laminate film on the side in contact with the light-diffusion control film to provide a release layer.
最初，作為本發明之光擴散控制薄膜之一例，使用圖
3~4針對於薄膜內具有柱構造20a之具有等向性光擴散特性之光擴散控制薄膜10a加以說明。
Initially, as an example of the light diffusion control film of the present invention, the
3 to 4 describe the light-
首先，圖3(a)顯示薄膜內具有柱構造20a之等向性光擴散控制薄膜10a之俯視圖，圖3(b)係顯示沿虛線A-A於垂直方向切斷圖3(a)所示之等向性光擴散控制薄膜10a，自箭頭方向觀看切斷面之情況的等向向光擴散控制薄膜10a之剖面圖。
First, FIG. 3( a ) shows a top view of the isotropic light
又，圖4(a)顯示薄膜內具有柱構造20a之等向性光擴散控制薄膜10a之全體圖，圖4(b)係顯示藉由圖4(a)之等向性光擴散控制薄膜10a而擴散之光的擴散程度(擴散光之擴展形狀)。
4(a) shows an overall view of the isotropic light-
亦即，如圖3(a)之俯視圖所示，等向性光擴散控制薄膜10a具有由折射率相對較高的柱狀物12a與折射率相對較低之區域14a所成之柱構造20a。
That is, as shown in the top view of FIG. 3( a ), the isotropic light
又，如圖3(b)之剖面圖所示，於等向性光擴散控制薄膜10a之內部，具有折射率相對較高的柱狀物12a與折射率相對較低之區域14a，複數之折射率相對較高的柱狀物12a以具有特定間隔之方式以林立狀態配置。
Furthermore, as shown in the cross-sectional view of FIG. 3(b), inside the isotropic light
藉此推定為如圖4(a)所示，於入射角θ1為光擴散入射角度區域內的入射光藉由等向性光擴散控制薄膜10a而擴散。
From this, as shown in FIG.4(a), it is estimated that the incident light in the light-diffusion incident angle range of the incident angle θ1 is diffused by the isotropic light-
亦即推定為如圖3(b)所示，對於等向性光擴散控制薄膜10a之入射光的入射角係自對於柱構造20a之邊界面20a’平行至特定角度範圍內之值，亦即，為光擴散入射角度區
域內之值之情況，入射光(52、54)以邊變化方向邊沿膜厚方向通過柱構造20a之折射率相對較高之柱狀物12a之內部，而使出光面側之光的行進方向變得不一樣。
That is to say, as shown in Fig. 3(b), the incident angle of the incident light to the isotropic light
其結果推定為，於入射角為光擴散入射角度區域內之情況，入射光藉由等向性光擴散控制薄膜10a而擴散而成為特定之擴散光(52’、54’)。
As a result, when the incident angle is within the light diffusion incident angle range, the incident light is diffused by the isotropic light
另一方面，入射光對於等向性光擴散控制薄膜10a之入射角偏離光擴散入射角度區域之情況時，推定為如圖3(b)所示，入射光56並未藉由等向性光擴散控制薄膜10a而擴散，而是直接通過，成為透過光56’。
On the other hand, when the incident angle of the incident light to the isotropic light
藉由以上基本原理，具備柱構造20a之等向性光擴散控制薄膜10a例如如圖4(a)所示，可能發揮光之透過與擴散中之入射角依存性。
Based on the above-mentioned basic principles, the isotropic light
又，如圖3(b)所示，具備柱構造20a之等向性光擴散控制薄膜10a作為其光擴散特性通常成為具有「等向性」。
Moreover, as shown in FIG.3(b), the isotropic light-
此處，本發明中所謂「等向性」意指如圖4(b)所示，入射光藉由薄膜而擴散時，經擴散之出射光於與薄膜平行之面內(有時稱為俯視)，該光的擴散程度不因該面內之方向而變化之性質。 Here, the term “isotropy” in the present invention means that, as shown in FIG. 4( b ), when incident light is diffused by a thin film, the diffused outgoing light is in a plane parallel to the thin film (sometimes referred to as a plan view). ), the property that the degree of diffusion of the light does not change due to the in-plane direction.
更具體而言，如圖4(a)所示，入射光藉由等向性光擴散控制薄膜10a而擴散時，經擴散之出射光之擴散程度於與薄膜平行之面內成為圓狀。
More specifically, as shown in Fig. 4(a), when the incident light is diffused by the isotropic light
又，如圖4(a)所示，等向性光擴散控制薄膜，於入射光之入射角θ1包含於光擴散入射角度區域時，即使 其入射角θ1不同之情況，於出光面側亦可大致同樣地進行光擴散。 Furthermore, as shown in FIG. 4( a ), the isotropic light diffusion control film, when the incident angle θ1 of the incident light is included in the light diffusion incident angle region, is When the incident angle θ1 thereof is different, the light diffusion can be performed in substantially the same manner on the light emitting surface side.
因此，等向性光擴散控制薄膜可謂具有將光集中於特定部位之聚光作用。 Therefore, the isotropic light diffusion control film can be said to have a condensing effect of concentrating light on a specific portion.
又，柱構造之特定柱狀物內部之入射光之方向變化，認為除了成為如圖3(b)所示般藉由全反射而方向以直線狀鋸齒狀變化之步進指數型之情況以外，亦有成為方向以曲線狀變化之梯度指數型之情況。 In addition, the change of the direction of the incident light inside the specific column of the column structure is considered to be of a step-exponential type in which the direction changes in a linear zigzag shape due to total reflection as shown in FIG. 3(b). There is also a case of a gradient exponential type in which the direction changes in a curve shape.
又，本發明之光擴散控制薄膜具有之內部構造若為包含高折射率區域與低折射率區域者，則不限定於上述柱構造。 Moreover, the internal structure which the light-diffusion control film of this invention has is not limited to the above-mentioned column structure as long as it includes a high-refractive-index region and a low-refractive-index region.
亦即，光擴散控制薄膜之技術領域中，若為可藉由過去以來已知之相分離而形成之內部構造，則於本發明之光擴散控制薄膜中，亦同樣可形成。 That is, in the technical field of the light-diffusion control film, if the internal structure can be formed by phase separation known in the past, the light-diffusion control film of the present invention can be similarly formed.
例如，如圖5(a)所示，光擴散控制薄膜10b係具有折射率不同之複數板狀區域12b、14b沿薄膜面沿任意一方向交互配置而成之百葉窗構造20b。
For example, as shown in FIG. 5( a ), the light
或者，亦可如圖5(b)所示，光擴散控制薄膜10c係柱狀物12c沿薄膜膜厚方向於中間點具有彎曲部16之彎曲柱構造20c。
Alternatively, as shown in FIG. 5( b ), the light
或者，亦可如圖5(c)所示，光擴散控制薄膜10d係於折射率相對較低之區域14d中，折射率相對較高之複數薄片狀物12d沿薄膜面沿任意一方向排列複數行之特定內部構造20d。
Alternatively, as shown in FIG. 5( c ), the light
或者，亦可如圖5(d)所示，光擴散控制薄膜10e係百葉窗構造20b與柱構造20a於上下方向組合而成。
Alternatively, as shown in FIG. 5( d ), the light
亦即，光擴散控制薄膜之技術領域中已知之內部構造之種類持續有多樣，但本發明之光擴散控制薄膜10a、10b~10e為該等內部構造之任一者均可。
That is, the types of internal structures known in the technical field of the light-diffusion control film continue to vary, but the light-
且，無論哪種內部構造，光擴散之基本原理均與柱構造20a之情況相同。
In addition, regardless of the internal structure, the basic principle of light diffusion is the same as in the case of the
但，因各內部構造之形態，擴散光之擴散形狀產生差異。 However, depending on the shape of each internal structure, the diffusing shape of the diffused light varies.
例如，圖5(a)所示之百葉窗構造20b之情況，異向性光擴散之俯視中產生棒狀擴散光，於圖5(b)所示之彎曲柱構造20c時，於彎曲部之上方等向性光擴散之光的一部分於彎曲部之下方產生進而經等向性光擴散之擴散光。
For example, in the case of the
又，圖5(c)所示之特定內部構造20d時，由於係百葉窗構造20b與柱構造20a之混雜型，故產生俯視下橢圓形狀之擴散光，如圖5(d)所示組合百葉窗構造20b及柱構造20a時，於柱構造20a經光擴散之光的一部分進而於百葉窗20b被光擴散，故而產生俯視時子彈狀之擴散光。
In addition, in the case of the specific
本發明之光擴散控制薄膜中之內部構造，若為包含高折射率區域與低折射率區域，而獲得光擴散特性者，則未特別限制，可為柱構造或百葉窗構造等之各種態樣。 The internal structure of the light diffusion control film of the present invention is not particularly limited as long as it includes a high refractive index region and a low refractive index region to obtain light diffusion properties, and various aspects such as a column structure and a louver structure can be used.
以下作為一例，針對柱構造加以說明，但百葉窗構造 等之其他內部構造，亦可基於有關柱構造的內容。 Hereinafter, the column structure will be described as an example, but the shutter structure will be Other internal structures, etc., may also be based on the content of the column structure.
如圖3(a)~(b)所示，柱構造20a為用以將入射光等向性擴散之內部構造，具體而言，係於折射率相對較低的區域中，林立折射率相對較高的複數柱狀物而成之內部構造。
As shown in FIGS. 3( a ) to ( b ), the
柱構造中之折射率相對較低之區域的折射率與折射率相對較高的複數柱狀物之折射率差較好為0.01以上之值。 In the column structure, the refractive index difference between the refractive index of the relatively low refractive index region and the relatively high refractive index of the plurality of columns is preferably a value of 0.01 or more.
其理由為若該折射率差成為0.01以上之值，則入射光於柱構造內全反射之角度區域變窄，故有使入射角度依存性過度降低之情況之故。 The reason for this is that when the refractive index difference becomes a value of 0.01 or more, the angle region in which the incident light is totally reflected in the column structure becomes narrow, and the incident angle dependence may be excessively reduced.
因此，該折射率差之下限值更好成為0.03以上之值，又更好為0.1以上之值。 Therefore, the lower limit value of the refractive index difference is more preferably a value of 0.03 or more, and more preferably a value of 0.1 or more.
又，該折射率差雖較大較好，但基於選定可形成柱構造之材料之觀點，認為0.3左右為上限。 The difference in refractive index is preferably large, but from the viewpoint of selecting a material that can form a column structure, it is considered that about 0.3 is the upper limit.
又，於如圖3(a)~(b)所示之柱構造20a中，柱狀物12a之剖面中之最大徑較好成為0.1~15μm之範圍內之值。
Moreover, in the
其理由為該最大徑若為未達0.1μm之值，則儘管為入射光之入射角度，亦有難以顯示光擴散特性之情況。另一方面，該最大徑若為超過15μm之值，則於柱構造內直進的光增加，有使擴散光之均一性降低之情況之故。 The reason for this is that if the maximum diameter is a value of less than 0.1 μm, it may be difficult to exhibit light diffusion properties despite the incident angle of incident light. On the other hand, when the maximum diameter is a value exceeding 15 μm, the light traveling straight in the column structure increases, and the uniformity of the diffused light may decrease.
因此，柱構造中，該最大徑之下限值更好為0.5μm以上之值，又更好為1μm以上之值。 Therefore, in the column structure, the lower limit value of the maximum diameter is more preferably a value of 0.5 μm or more, and more preferably a value of 1 μm or more.
且，柱構造中，該最大徑之上限值更好為10μm以下之值，又更好為5μm以下之值。 In addition, in the column structure, the upper limit value of the maximum diameter is more preferably a value of 10 μm or less, and more preferably a value of 5 μm or less.
又，關於柱狀物之剖面形狀，雖未特別限定，但較好為例如圓、橢圓、多邊形、不規則形等。 Moreover, although the cross-sectional shape of a columnar object is not specifically limited, For example, a circle, an ellipse, a polygon, an irregular shape, etc. are preferable.
且，所謂柱狀物之剖面意指藉由與薄膜表面平行之面切斷而得之剖面。 In addition, the cross section of the columnar object means a cross section obtained by cutting a plane parallel to the surface of the film.
又，柱狀物之最大徑或長度等可藉由光學數位顯微鏡觀察而測定。 In addition, the maximum diameter, length, etc. of the columnar objects can be measured by observation with an optical digital microscope.
又，上述最大徑之數值範圍於柱狀物間之距離亦同樣。 In addition, the numerical range of the said maximum diameter is also the same as the distance between the pillars.
又，如圖3(b)所示之柱構造20a之厚度(膜厚方向之長度)較好成為10~700μm之範圍內之值。
Moreover, it is preferable that the thickness (length in the film thickness direction) of the
其理由為該厚度若為未達10μm之值，則於柱構造內會直進之入射光增加，有難以獲得充分光擴散特性之範圍之情況。另一方面，若該厚度成為超過700μm之值，則對於光擴散控制薄膜用組成物照射活性能量線而形成柱構造時，因初期形成之柱構造會使光聚合之進行方向擴散，而有難以形成期望之柱構造之情況之故。 The reason for this is that if the thickness is a value of less than 10 μm, the incident light entering straight in the column structure increases, and it may be difficult to obtain a range in which sufficient light diffusion properties are obtained. On the other hand, when the thickness exceeds 700 μm, when the composition for a light diffusion control film is irradiated with active energy rays to form a column structure, the column structure formed at the initial stage diffuses the direction in which the photopolymerization proceeds, which makes it difficult to Because of the situation where the pillar structure of expectation is formed.
因此，柱構造之厚度下限值更好為30μm以上之值，又更好為50μm以上之值。 Therefore, the lower limit value of the thickness of the pillar structure is more preferably a value of 30 μm or more, and more preferably a value of 50 μm or more.
且，柱構造之厚度上限值更好為200μm以下之值，又更好為100μm以下之值。 Furthermore, the upper limit value of the thickness of the pillar structure is more preferably a value of 200 μm or less, and more preferably a value of 100 μm or less.
又，所謂「光擴散特性之範圍」意指顯示光擴散特性之入射角的範圍及擴散光之擴大範圍。 In addition, the "range of the light-diffusion characteristic" means the range of the incident angle which shows the light-diffusion characteristic, and the expansion range of the diffused light.
又，柱構造中，柱狀物12a等較好對於光擴散控制薄膜之膜厚方向以一定傾斜角度林立。
In addition, in the column structure, it is preferable that the
其理由為藉由使柱狀物之傾斜角為一定，而於柱構造內使入射光更穩定反射，可進一步提高源自柱構造之入射角度依存性之故。 The reason for this is that by making the inclination angle of the pillars constant, the incident light can be more stably reflected in the pillar structure, and the incident angle dependence due to the pillar structure can be further improved.
更具體而言，柱構造中，柱狀物對於薄膜面之法線的傾斜角較好成為0~80°之範圍內之值。 More specifically, in the column structure, the inclination angle of the column with respect to the normal to the film surface is preferably a value within a range of 0 to 80°.
其理由為若該傾斜角成為超過80°之值，則有伴隨此活性能量線之入射角度之絕對值亦變大之情況之故。因此，空氣與塗佈層之界面中之活性能量線之反射比例會增加，於形成柱構造時，有產生必須照射更高照度之活性能量線之情況之故。 The reason for this is that when the inclination angle becomes a value exceeding 80°, the absolute value of the incident angle of the active energy ray may also increase. Therefore, the reflection ratio of the active energy ray in the interface between the air and the coating layer increases, and when forming the column structure, it may be necessary to irradiate the active energy ray with higher illuminance.
因此，該傾斜角度之上限值更好為60°以下之值，又更好為40°以下之值。 Therefore, the upper limit value of the inclination angle is more preferably a value of 60° or less, and more preferably a value of 40° or less.
又，傾斜角度意指於對薄膜面垂直，且藉由將1根柱狀物全體沿軸線切斷為二的面而切斷薄膜時之剖面中所測定之對於薄膜表面之法線與柱狀物之最上部所成之角度中較窄側的角度。 In addition, the angle of inclination means the normal line to the film surface and the columnar shape measured in the cross-section when the film is cut by cutting the entirety of one columnar object in two along the axis that is perpendicular to the film surface. The angle of the narrower side of the angle formed by the uppermost part of the thing.
又，本發明之光擴散控制薄膜之膜厚較好成為10~700μm之範圍內之值。 Moreover, it is preferable that the film thickness of the light-diffusion control film of this invention is a value within the range of 10-700 micrometers.
其理由為光擴散控制薄膜之膜厚若為未達10μm之值，則於柱構造內直進之入射光增加，有難以顯示特定之光擴散特性之情況。另一方面，若光擴散控制薄膜之膜厚成為超過700μm之值，則對於光擴散控制薄膜用組成物照射活性能量線而形成柱構造時，因初期形成之柱構造會使光聚合之進行方向擴散，而有難以形成期望之柱構造之情況之故。且應用於顯示器等時，有易於顯示圖像產生起皺之情況之故。 The reason for this is that if the thickness of the light-diffusion control film is less than 10 μm, the incident light traveling straight in the column structure increases, and it may be difficult to exhibit specific light-diffusion characteristics. On the other hand, when the film thickness of the light-diffusion control film exceeds 700 μm, when the composition for light-diffusion control film is irradiated with active energy rays to form a column structure, the initially formed column structure may cause the direction of photopolymerization to proceed. It may be difficult to form a desired column structure due to diffusion. In addition, when applied to a display or the like, the displayed image tends to be wrinkled.
因此，光擴散控制薄膜之膜厚下限值更好為30μm以上之值，又更好為50μm以上之值。 Therefore, the lower limit value of the film thickness of the light-diffusion control film is more preferably a value of 30 μm or more, and more preferably a value of 50 μm or more.
且，光擴散控制薄膜之膜厚上限值更好為300μm以下之值，又更好為100μm以下之值。 Furthermore, the upper limit value of the film thickness of the light-diffusion control film is more preferably a value of 300 μm or less, and more preferably a value of 100 μm or less.
又，有關本發明之光擴散控制薄膜之特性，濁度70%以上之入射角度區域之幅度較好處於60°以上之值。 Moreover, regarding the characteristic of the light-diffusion control film of this invention, it is preferable that the width|variety of the incident angle range of 70% or more of haze is a value of 60 degrees or more.
藉由如此限制特定之入射角度區域之幅度，由於可有效率地擷取入射光，並均一擴散，故有提高擴散光之明亮度之情況。 By limiting the width of the specific incident angle region in this way, since the incident light can be efficiently captured and uniformly diffused, the brightness of the diffused light can be improved.
因此，濁度70%以上之入射角度區域之幅度較好設為 80°以上之值，更好設為100°以上之值。 Therefore, the amplitude of the incident angle region where the haze is 70% or more is preferably set to be The value of 80° or more is preferably set to a value of 100° or more.
又，有關本發明之光擴散控制薄膜之特性，於將薄膜表面之法線方向設為0°，自入射角度區域於與該區域偏離之方向照射傾斜60°之入射光時之直進透過光強度P.T之中央值較好設為0.1~99%之範圍內之值。 In addition, regarding the characteristics of the light diffusion control film of the present invention, when the normal direction of the film surface is set to 0°, the straight forward transmitted light intensity is irradiated with incident light inclined at 60° from the incident angle region in a direction deviating from the region. The central value of P.T is preferably set to a value within the range of 0.1 to 99%.
其理由為若該中央值成為未達0.1%之值，則有作為薄膜之透過率惡化之情況。 The reason for this is that the transmittance as a thin film may deteriorate when the median value is less than 0.1%.
另一方面，該中央值成為超過99%之值時，有入射角度區域不足之情況。 On the other hand, when the median value exceeds 99%, the incident angle region may be insufficient.
因此，該中央值之下限更好設為1%以上，又更好為5%以上。 Therefore, the lower limit of the median value is more preferably 1% or more, and more preferably 5% or more.
且，該中央值之上限更好設為50%以下，又更好設為15%以下。 Furthermore, the upper limit of the median value is more preferably 50% or less, and more preferably 15% or less.
又，所謂直進透過光強度係將與入射光相同角度射出之出射光強度除以入射光全體之強度，以百分比表示者。 In addition, the so-called direct transmitted light intensity is expressed as a percentage by dividing the intensity of the outgoing light emitted at the same angle as the incident light by the intensity of the entire incident light.
又，有關本發明之光擴散控制薄膜之特性，直進透過光強度P.T之偏差較好設為0.1~3.8%之範圍內之值。 Moreover, regarding the characteristic of the light-diffusion control film of this invention, it is preferable to set the deviation of the intensity|strength P.T of the straight forward transmitted light to a value within the range of 0.1 to 3.8%.
其理由為該偏差若成為未達0.1%之值，則有難以控制之情況。 The reason for this is that it may be difficult to control if the deviation becomes a value of less than 0.1%.
另一方面，該偏差若設為超過3.8%之值，則有光擴散狀態發生濃淡之情況。 On the other hand, when the deviation is set to a value exceeding 3.8%, the light diffusion state may be shaded.
因此該偏差之下限更好設為1%以上，又更好為2%以上。 Therefore, the lower limit of the deviation is more preferably 1% or more, and more preferably 2% or more.
且，該偏差值之上限更好設為3.5%以下，又更好設為2.8%以下。 Furthermore, the upper limit of the deviation value is more preferably 3.5% or less, and more preferably 2.8% or less.
又，本發明之層合體亦可於光擴散控制薄膜之一面，亦即層合上覆層合薄膜而成層合狀態之側之相反側之面上，層合步驟薄片。 Furthermore, the laminate of the present invention may be laminated with a step sheet on one side of the light-diffusion control film, that is, on the side opposite to the side where the overlying laminate film is laminated to form a laminated state.
如此，藉由以上覆層合薄膜及步驟薄片挾持光擴散控制薄膜之兩面，而可有效地保護光擴散控制薄膜。 In this way, the light-diffusion control film can be effectively protected by holding both sides of the light-diffusion control film by the above-mentioned lamination film and the step sheet.
此處，所謂步驟薄片係製造層合體時，供光擴散控制用組成物塗佈之薄片。 Here, the so-called step sheet is a sheet to which the composition for light diffusion control is applied when the laminate is produced.
作為該步驟薄片，可使用通常之剝離薄膜，舉例為例如對於聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯等之聚酯薄膜、或聚丙烯、聚乙烯等之聚烯烴薄膜塗佈聚矽氧樹脂等之剝離劑而設置剝離層者。 As the step sheet, a usual release film can be used, such as polyester film for polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc., or polypropylene , Polyolefin films such as polyethylene and the like are coated with release agents such as polysiloxane resins to form a release layer.
又，該步驟薄片之膜厚通常較好設為20~150μm之範圍內之值。 In addition, the film thickness of the sheet in this step is usually preferably set to a value within the range of 20 to 150 μm.
本發明之實施形態係層合體之製造方法，係第2實施形態之層合體之製造方法，其特徵為包含下述步驟(a)~(d)。 An embodiment of the present invention is a method for producing a laminate, and is a method for producing a laminate according to a second embodiment, characterized by including the following steps (a) to (d).
(a)準備包含高折射率活性能量線硬化成分及低折射率活性能量線硬化成分之光擴散控制薄膜用組成物之步驟， (b)對步驟薄片膜狀塗佈光擴散控制薄膜用組成物而形成塗佈層之步驟，(c)對於塗佈層之露出面層合滿足關係式(1)之上覆層合薄膜之步驟，(d)邊使塗佈層移動，邊透過上覆層合薄膜，對該塗佈層照射活性能量線之步驟。 (a) a step of preparing a composition for a light diffusion control film comprising a high refractive index active energy ray hardening component and a low refractive index active energy ray hardening component, (b) the step of coating the composition for a light diffusion control film in the form of a film on a sheet to form a coating layer, and (c) laminating the exposed surface of the coating layer to satisfy the relational expression (1) on the overlying laminated film Step, (d) a step of irradiating the coating layer with active energy rays through the overlying laminate film while moving the coating layer.
以下，以與第1實施形態不同為中心，參考適當圖式具體說明本發明之第2實施形態。 Hereinafter, the second embodiment of the present invention will be specifically described with reference to appropriate drawings, focusing on the difference from the first embodiment.
步驟(a)係準備光擴散控制薄膜用組成物之步驟。 The step (a) is a step of preparing a composition for a light-diffusion control film.
更具體而言，係混合以下說明之(A)~(B)成分以及依需要之其他成分的步驟。 More specifically, it is a step of mixing the components (A) to (B) described below and other components as needed.
且，混合時，可於室溫下直接攪拌，但基於提高均一性之觀點，較好於例如40~80℃之加溫條件下攪拌，成為均一混合液。 In addition, when mixing, it may be directly stirred at room temperature, but from the viewpoint of improving the uniformity, it is preferable to stir under heating conditions of, for example, 40 to 80° C. to obtain a homogeneous mixed solution.
又，為成為適於塗佈之期望黏度，亦較好進而添加稀釋溶劑。 In addition, in order to obtain a desired viscosity suitable for coating, it is also preferable to further add a diluting solvent.
本發明之光擴散控制薄膜用組成物之特徵係包含高折射率活性能量線硬化成分作為(A)成分。 The feature of the composition for a light diffusion control film of the present invention is that it contains a high refractive index active energy ray hardening component as the component (A).
其理由為藉由包含高折射率活性能量線硬化成分作為(A)成分，而與後述之作為(B)成分之低折射率活性能量線 硬化成分之間於聚合速度產生特定差，而抑制兩成分彼此均一共聚合，藉此可邊有效率地將(A)成分及(B)成分相分離(phase separation)邊進行光硬化之故。 The reason for this is that by including a high-refractive-index active energy ray hardening component as the component (A), and a low-refractive-index active energy ray as the component (B) described later A specific difference occurs in the polymerization rate between the hardening components, and the two components are suppressed from being uniformly copolymerized with each other, whereby photohardening can be performed while efficiently phase separation of the (A) component and the (B) component.
藉此，由於於光硬化前之階段儘管為均一組成物，於光硬化時亦可形成柱構造或百葉窗構造之特定內部構造，故可對作為所得硬化物之光擴散控制薄膜，賦予可效率良好地使入射光擴散之優異光擴散特性。 In this way, although it is a homogeneous composition at the stage before photocuring, a specific internal structure of a column structure or a louver structure can be formed during photocuring, so that the light diffusion control film which is the obtained cured product can be provided with high efficiency. Excellent light-diffusing properties for diffusing incident light.
作為(A)成分之高折射率活性能量線硬化成分的折射率較好成為1.5~1.65之範圍內之值。 The refractive index of the high-refractive-index active energy ray hardening component as the component (A) is preferably a value within the range of 1.5 to 1.65.
其理由為若(A)成分之折射率成為未達1.5之值，則與作為(B)成分之低折射率活性能量線硬化成分的折射率差變得過小，而有難以獲得有效光擴散特性之情況之故。另一方面，若(A)成分之折射率成為超過1.65之值，則與(B)成分之折射率差雖變大，但有亦難以形成與(B)成分之外觀上的相溶狀態之情況之故。 The reason for this is that when the refractive index of the component (A) becomes a value less than 1.5, the difference in refractive index with the low-refractive-index active energy ray-curable component (B) becomes too small, making it difficult to obtain effective light diffusing properties. because of the situation. On the other hand, when the refractive index of the (A) component becomes a value exceeding 1.65, the difference in refractive index with the (B) component becomes large, but it is difficult to form a compatible state with the (B) component in appearance. because of the situation.
因此，(A)成分之折射率之下限值更好成為1.55以上之值，又更好為1.56以上之值。 Therefore, the lower limit value of the refractive index of the component (A) is more preferably a value of 1.55 or more, and more preferably a value of 1.56 or more.
且，(A)成分之折射率之上限值更好成為1.6以下之值，又更好為1.59以下之值。 Furthermore, the upper limit value of the refractive index of the component (A) is more preferably a value of 1.6 or less, and more preferably a value of 1.59 or less.
又，所謂上述之(A)成分之折射率，意指藉由光照射硬化前之(A)成分之折射率。 In addition, the refractive index of the said (A) component means the refractive index of (A) component before hardening by light irradiation.
又，折射率可依據例如JIS K0062：1992測定。 In addition, the refractive index can be measured based on, for example, JIS K0062:1992.
又，(A)成分種類並未特別限制，但較好為含有複數芳香環之(甲基)丙烯酸酯。 Moreover, although the kind of (A) component is not specifically limited, (meth)acrylate containing plural aromatic rings is preferable.
其理由係若為該等化合物，則可更有效率地邊將(A)成分及(B)成分相分離邊進行光硬化，而可獲得更優異之光擴散特性之故。 The reason for this is that with these compounds, photocuring can be performed more efficiently while phase-separating (A) component and (B) component, and more excellent light diffusion characteristics can be obtained.
作為此等化合物，可舉例為例如(甲基)丙烯酸聯苯酯、(甲基)丙烯酸萘酯、(甲基)丙烯酸蒽酯、(甲基)丙烯酸苄基苯酯、(甲基)丙烯酸聯苯氧基烷酯、(甲基)丙烯酸萘氧基烷酯、(甲基)丙烯酸蒽氧基烷酯、(甲基)丙烯酸苄基苯氧基烷酯、(甲基)丙烯酸鄰-苯氧基苄酯、(甲基)丙烯酸間-苯氧基苄酯、(甲基)丙烯酸對-苯氧基苄酯等，或該等之一部分藉由鹵素、烷基、烷氧基、鹵化烷基等取代者等。 As these compounds, for example, biphenyl (meth)acrylate, naphthyl (meth)acrylate, anthracene (meth)acrylate, benzylphenyl (meth)acrylate, biphenyl (meth)acrylate, Phenoxyalkyl ester, (meth)acrylate naphthoxyalkyl, (meth)acrylate anthracyloxyalkyl, (meth)acrylate benzylphenoxyalkyl, (meth)acrylate o-phenoxy Benzyl (meth)acrylate, m-phenoxybenzyl (meth)acrylate, p-phenoxybenzyl (meth)acrylate, etc., or a part of these by halogen, alkyl, alkoxy, halogenated alkyl and so on for the replacement.
又，所謂「(甲基)丙烯酸」意指丙烯酸及甲基丙烯酸兩者。 In addition, "(meth)acrylic acid" means both acrylic acid and methacrylic acid.
又，作為(A)成分，更好為包含含有聯苯環之化合物，尤其更好為包含以下述通式(1)表示之聯苯化合物。 Moreover, as (A) component, it is more preferable to contain the compound containing a biphenyl ring, and it is more preferable to contain the biphenyl compound represented by following General formula (1).
(通式(1)中，R1~R10係分別獨立，R1~R10之至少1個為以下述通式(2)表示之取代基，其餘為氫原子、羥基、羧基、烷基、烷氧基、鹵化烷基、羥基烷基、羧基烷基及鹵原子之任一取代基)。 (In the general formula (1), R 1 to R 10 are independent of each other, at least one of R 1 to R 10 is a substituent represented by the following general formula (2), and the rest are a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group , alkoxy, halogenated alkyl, hydroxyalkyl, carboxyalkyl and any substituent of halogen atom).
(通式(2)中，R11為氫原子或甲基，碳數n為1~4之整數，重複數m為1~10之整數)。 (In the general formula (2), R 11 is a hydrogen atom or a methyl group, the carbon number n is an integer of 1 to 4, and the repetition number m is an integer of 1 to 10).
其理由推定為藉由包含具有特定構造之聯苯化合物作為(A)成分，可於(A)成分及(B)成分之聚合速度產生特定差，使(A)成分與(B)成分之相溶性降低至特定範圍，而可使兩成分彼此之共聚合性降低之故。 The reason for this is presumed that by including a biphenyl compound having a specific structure as the component (A), a specific difference can be generated in the polymerization rates of the components (A) and (B), and the phase between the components (A) and (B) can be improved. The solubility is lowered to a specific range, and the copolymerizability of the two components can be lowered.
又，提高源自(A)成分之折射率相對高的區域的折射率，可更容易調節將與源自(B)成分之折射率相對低的區域的折射率之差設為特定以上之值。 In addition, by increasing the refractive index of the region having a relatively high refractive index derived from the (A) component, it becomes easier to adjust the difference between the refractive index from the region having a relatively low refractive index derived from the (B) component to a value greater than or equal to a specific value. .
又，作為以通式(1)表示之聯苯化合物之具體例可較好地舉例下述式(3)~(4)表示之化合物。 Moreover, as a specific example of the biphenyl compound represented by General formula (1), the compound represented by following formula (3)-(4) can be mentioned preferably.
本發明之光擴散控制薄膜用組成物之特徵係包含低折射率活性能量線硬化成分作為(B)成分。 The characteristic of the composition for light-diffusion control films of this invention is that it contains a low-refractive-index active energy ray hardening component as (B) component.
其理由為藉由包含低折射率活性能量線硬化成分作為(B)成分，而與上述之作為(A)成分之高折射率活性能量線硬化成分之間於聚合速度產生特定差，而抑制兩成分彼此均一共聚合，藉此可邊有效率地將(A)成分及(B)成分相分離邊進行光硬化之故。 The reason for this is that by including the low-refractive-index active-energy-ray-curing component as the component (B) and the above-mentioned high-refractive-index active-energy-ray-curing component as the component (A), there is a specific difference in the polymerization rate, thereby suppressing the two. It is because the components are uniformly copolymerized and photocuring can be performed while efficiently separating the (A) component and the (B) component.
藉此，由於於光硬化前之階段儘管為均一組成物，於光硬化時亦可形成柱構造或百葉窗構造之特定內部構造，故可對作為所得硬化物之光擴散控制薄膜，賦予可效率良好地使入射光擴散之優異光擴散特性。 In this way, although it is a homogeneous composition at the stage before photocuring, a specific internal structure of a column structure or a louver structure can be formed during photocuring, so that the light diffusion control film which is the obtained cured product can be provided with high efficiency. Excellent light-diffusing properties for diffusing incident light.
作為(B)成分之低折射率活性能量線硬化成分的折射率較好成為1.4~1.5之範圍內之值。 The refractive index of the low-refractive-index active energy ray hardening component as the component (B) is preferably a value within the range of 1.4 to 1.5.
其理由為若(B)成分之折射率成為未達1.4之值，則與(A)成分之折射率差雖變大，但有與(A)成分之相溶性極端惡化，而難以形成特定內部構造之情況之故。另一方面，若(B)成分之折射率成為超過1.5之值，則與(A)成分之折射率差變得過小，而有難以獲得期望光擴散特性之情況之故。 The reason for this is that when the refractive index of the component (B) becomes a value less than 1.4, the difference in refractive index with the component (A) increases, but the compatibility with the component (A) is extremely deteriorated, making it difficult to form a specific interior. Constructed condition. On the other hand, when the refractive index of (B) component becomes a value exceeding 1.5, the refractive index difference with (A) component becomes too small, and it may become difficult to acquire desired light-diffusion characteristics.
因此，(B)成分之折射率之下限值更好成為1.45以上之值，又更好為1.45以上之值。 Therefore, the lower limit value of the refractive index of the component (B) is more preferably a value of 1.45 or more, and more preferably a value of 1.45 or more.
且，(B)成分之折射率之上限值更好成為1.49以下之值，又更好為1.46以下之值。 Furthermore, the upper limit value of the refractive index of the component (B) is more preferably a value of 1.49 or less, and more preferably a value of 1.46 or less.
又，所謂上述之(B)成分之折射率，意指藉由光照射硬化前之(B)成分之折射率。 In addition, the refractive index of the said (B) component means the refractive index of (B) component before hardening by light irradiation.
又，折射率可依據例如JIS K0062：1992測定。 In addition, the refractive index can be measured based on, for example, JIS K0062:1992.
又，上述之(A)成分的折射率與(B)成分的折射率之差較好設為0.01以上之值。 Moreover, the difference between the refractive index of the above-mentioned (A) component and the refractive index of the (B) component is preferably set to a value of 0.01 or more.
其理由為該折射率之差若成為未達0.01之值，則入射光於特定內部構造內全反射之角度變窄，故有光擴散特性之範圍變過度狹窄之情況之故。另一方面，該折射率差若成為過度大之值，則(A)成分與(B)成分之相溶性過度惡化，而有難以形成特定之內部構造之情況之故。 The reason for this is that if the difference in the refractive index becomes a value less than 0.01, the angle at which the incident light is totally reflected in a specific internal structure becomes narrow, so that the range of light diffusion characteristics may become too narrow. On the other hand, when this refractive index difference becomes an excessively large value, the compatibility of (A) component and (B) component deteriorates excessively, and it may become difficult to form a specific internal structure.
因此，(A)成分的折射率與(B)成分的折射率之差的下 限值更好設為0.05以上之值，又更好設為0.1以上之值。 Therefore, the difference between the refractive index of the (A) component and the refractive index of the (B) component is lower than The limit value is preferably set to a value of 0.05 or more, and more preferably a value of 0.1 or more.
且，(A)成分的折射率與(B)成分的折射率之差的上限值更好設為0.5以下之值，又更好設為0.2以下之值。 Moreover, the upper limit of the difference between the refractive index of the (A) component and the refractive index of the (B) component is more preferably a value of 0.5 or less, and more preferably a value of 0.2 or less.
又，此處所謂(A)成分與(B)成分的折射率意指藉由光照射硬化前之(A)成分與(B)成分之折射率。 In addition, the refractive index of (A) component and (B) component here means the refractive index of (A) component and (B) component before hardening by light irradiation.
又，(B)成分種類並未特別限制，但可舉例為例如胺基甲酸酯(甲基)丙烯酸酯、於側鏈具有(甲基)丙烯醯基之(甲基)丙烯酸系聚合物、含有(甲基)丙烯醯基之聚矽氧樹脂、不飽和聚酯樹脂等，但特佳為胺基甲酸酯(甲基)丙烯酸酯。 In addition, the type of the component (B) is not particularly limited, but for example, urethane (meth)acrylate, (meth)acrylic polymer having a (meth)acryloyl group in a side chain, Polysiloxane resins containing (meth)acryloyl groups, unsaturated polyester resins, etc., urethane (meth)acrylates are particularly preferred.
其理由係若為胺基甲酸酯(甲基)丙烯酸酯，則可更有效率地邊將(A)成分及(B)成分相分離邊進行光硬化，而可獲得更優異之光擴散特性之故。 The reason for this is that in the case of urethane (meth)acrylate, photocuring can be performed more efficiently while phase-separating the (A) component and the (B) component, and more excellent light diffusion properties can be obtained. the reason.
又，所謂(甲基)丙烯酸酯意指丙烯酸酯及甲基丙烯酸酯兩者。 In addition, (meth)acrylate means both acrylate and methacrylate.
又，胺基甲酸酯(甲基)丙烯酸酯係由(B1)含有至少2個異氰酸酯基之化合物、(B2)多元醇化合物，較好為二醇化合物，特佳為聚烷二醇、及(B3)(甲基)丙烯酸羥基烷酯所形成。 Further, the urethane (meth)acrylate is composed of (B1) a compound containing at least two isocyanate groups, (B2) a polyol compound, preferably a diol compound, particularly preferably a polyalkylene glycol, and (B3) Hydroxyalkyl (meth)acrylate is formed.
又，(B)成分為亦包含具有胺基甲酸酯鍵之重複單位的寡聚物者。 Moreover, (B) component is an oligomer which also contains the repeating unit which has a urethane bond.
其中作為(B1)成分之含有至少2個異氰酸酯基之化合 物可舉例為例如2,4-甲苯二異氰酸酯、2,6-甲苯二異氰酸酯、1,3-二甲苯二異氰酸酯、1,4-二甲苯二異氰酸酯、4,4’-二異氰酸亞甲基二苯(MDI)等之芳香族異氰酸酯、六亞甲基二異氰酸酯等之脂肪族聚異氰酸酯、異佛酮二異氰酸酯(IPDI)、氫化二苯基甲烷二異氰酸酯等之脂環式聚異氰酸酯、及該等之縮脲體、異氰脲酸酯體、進而為乙二醇、丙二醇、新戊二醇、三羥甲基丙烷、蓖麻油等之低分子含活性氫之化合物的反應物的加成物(例如二甲苯二異氰酸酯系3官能加成物)等。 Among them, the compound containing at least 2 isocyanate groups as the component (B1) The compound can be exemplified by, for example, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,3-xylene diisocyanate, 1,4-xylene diisocyanate, 4,4'-methylene diisocyanate Aromatic isocyanates such as diphenyldiphenyl (MDI), aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate (IPDI), hydrogenated diphenylmethane diisocyanate, and Addition of reactants of these uret compounds, isocyanurate compounds, and further low-molecular-weight active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil, etc. Compounds (for example, xylene diisocyanate-based trifunctional adducts) and the like.
又，形成胺基甲酸酯(甲基)丙烯酸酯之成分中，作為(B2)成分的聚烷二醇舉例為例如聚乙二醇、聚丙二醇、聚丁二醇、聚己二醇等，其中，特佳為聚丙二醇。 In addition, among the components forming the urethane (meth)acrylate, the polyalkylene glycol as the component (B2) is, for example, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyethylene glycol, and the like, for example, Among them, polypropylene glycol is particularly preferred.
其理由為若為聚丙二醇，則使(B)成分硬化時，可成為該硬化物中之良好軟鏈段，而可有效提高所得光擴散控制薄膜之處理性或安裝性之故。 The reason for this is that when the component (B) is cured, polypropylene glycol can be a good soft segment in the cured product and can effectively improve the properties and mountability of the resulting light diffusion control film.
又，(B)成分之重量平均分子量主要可藉由(B2)成分之重量平均分子量調節。此處，(B2)成分之重量平均分子量通常為2,300~19,500，較好為4,300~14,300，特佳為6,300~12,300。 Moreover, the weight average molecular weight of (B) component can be adjusted mainly by the weight average molecular weight of (B2) component. Here, the weight average molecular weight of the component (B2) is usually 2,300 to 19,500, preferably 4,300 to 14,300, and particularly preferably 6,300 to 12,300.
又，形成胺基甲酸酯(甲基)丙烯酸酯之成分中，作為(B3)成分的(甲基)丙烯酸羥基烷酯舉例為例如(甲基)丙烯酸2-羥基乙酯、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸3-羥基丙酯、(甲基)丙烯酸2-羥基丁酯、(甲基)丙烯酸3-羥基丁酯、(甲基)丙烯酸4-羥基丁酯等。 In addition, among the components that form urethane (meth)acrylate, the hydroxyalkyl (meth)acrylate as the component (B3) is, for example, 2-hydroxyethyl (meth)acrylate, (meth)acrylate, and hydroxyalkyl (meth)acrylate. 2-hydroxypropyl acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate Wait.
且，基於降低所得胺基甲酸酯(甲基)丙烯酸酯之聚合速度，更有效地形成特定內部構造之觀點，尤其更好為甲基丙烯酸羥基烷酯，又更好為甲基丙烯酸2-羥基乙酯。 And, from the viewpoint of reducing the polymerization rate of the obtained urethane (meth)acrylate and forming a specific internal structure more efficiently, especially hydroxyalkyl methacrylate is more preferable, and 2-methacrylate is more preferable. Hydroxyethyl ester.
又，將(A)成分及(B)成分之合計量設為100重量份時，(A)成分與(B)成分之摻合比((A)成分：(B)成分(重量比))較好設為20：80~80：20之範圍內之值。 Moreover, when the total amount of (A) component and (B) component is 100 parts by weight, the blending ratio of (A) component and (B) component ((A) component: (B) component (weight ratio)) It is preferable to set the value within the range of 20:80~80:20.
亦即，將(A)成分及(B)成分之合計量設為100重量份時，(B)成分之摻合比例較好設為20~80重量份之範圍內之值。 That is, when the total amount of (A) component and (B) component is made into 100 weight part, it is preferable to make the compounding ratio of (B) component into the value within the range of 20-80 weight part.
其理由係若(B)成分之摻合比例成為未達20重量份之值，則源自(A)成分之折射率相對較高的區域幅度與源自(B)成分之折射率相對較低的區域幅度相比較，過度變大，而有難以獲得良好光擴散特性之情況之故。另一方面，若(B)成分之摻合比例成為超過80重量份之值，則(A)成分相對於(B)成分之存在比例變少，源自(A)成分之折射率相對較高的區域幅度與源自(B)成分之折射率相對較低的區域幅度相比較，過度變小，而有難以獲得良好光擴散特性之情況之故。 The reason for this is that if the blending ratio of the component (B) is less than 20 parts by weight, the width of the region where the refractive index derived from the component (A) is relatively high and the refractive index derived from the component (B) are relatively low. Compared with the area width of , the area becomes excessively large, and it is difficult to obtain good light diffusion characteristics. On the other hand, when the blending ratio of the component (B) exceeds 80 parts by weight, the presence ratio of the component (A) to the component (B) decreases, and the refractive index derived from the component (A) is relatively high. The domain width of α becomes excessively small compared with the relatively low domain width of the refractive index derived from the (B) component, and it may be difficult to obtain good light diffusion characteristics.
因此，將(A)成分及(B)成分之合計量設為100重量份時，(B)成分之摻合比例之下限值更好設為40重量份以上之值，又更好較好設為55重量份以上之值。 Therefore, when the total amount of the (A) component and the (B) component is 100 parts by weight, the lower limit value of the blending ratio of the (B) component is more preferably 40 parts by weight or more, even more preferably The value is set to 55 parts by weight or more.
且，將(A)成分及(B)成分之合計量設為100重量份 時，(B)成分之摻合比例之上限值更好設為70重量份以下之值，又更好較好設為65重量份以下之值。 And let the total amount of (A) component and (B) component be 100 parts by weight In this case, the upper limit of the blending ratio of the component (B) is preferably set to a value of 70 parts by weight or less, and more preferably set to a value of 65 parts by weight or less.
又，光擴散控制薄膜用組成物中，較好含有光聚合起始劑作為(C)成分。 Moreover, it is preferable to contain a photopolymerization initiator as (C)component in the composition for light-diffusion control films.
其理由為藉由含有光聚合起始劑，對於光擴散控制薄膜組成物照射活性能量線時，可更有效率地邊將(A)成分及(B)成分相分離邊進行光硬化，而可獲得更優異之光擴散特性之故。 The reason for this is that when the light diffusion control film composition is irradiated with active energy rays by including a photopolymerization initiator, photocuring can be performed more efficiently while phase-separating the (A) component and the (B) component. Because of obtaining more excellent light diffusion characteristics.
此處，作為光聚合起始劑，舉例為苯偶因、苯偶因甲醚、苯偶因***、苯偶因異丙醚、苯偶因正丁醚、苯偶因異丁醚、苯乙酮、二甲胺基苯乙酮、2,2-二甲氧基-2-苯基苯乙酮、2,2-二乙氧基-2-苯基苯乙酮、2-羥基-2-甲基-1-苯基丙烷-1-酮、1-羥基環己基苯基酮、2-甲基-1-[4-(甲硫基)苯基]-2-嗎啉基-丙烷-1-酮、4-(2-羥基乙氧基)苯基-2-(羥基-2-丙基)酮、二苯甲酮、對-苯基二苯甲酮、4,4’-二乙胺基二苯甲酮、二氯二苯甲酮、2-甲基蒽醌、2-乙基蒽醌、2-第三丁基蒽醌、2-胺基蒽醌、2-甲基噻噸酮、2-乙基噻噸酮、2-氯噻噸酮、2,4-二甲基噻噸酮、2,4-二乙基噻噸酮、苄基二甲基縮醛、苯乙酮二甲基縮醛、對-二甲胺基苯甲酸酯、寡聚[2-羥基-2-甲基-1-[4-(1-甲基乙烯基)苯基]丙烷]等，可單獨使用該等中之1種，亦可組合2種以上使用。 Here, as the photopolymerization initiator, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, phenylethyl ether, etc. are exemplified here. Ketone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2- Methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinyl-propane-1 - Ketone, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylamine benzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone , 2-ethyl thioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl dimethyl acetal, acetophenone two Methyl acetal, p-dimethylaminobenzoate, oligo[2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propane], etc., can be used alone One of these may be used, or two or more may be used in combination.
作為(C)成分之光聚合起始劑之摻合量，相對於(A)成分及(B)成分之合計量100重量份，較好設為0.2~20重量份之範圍內之值。 The blending amount of the photopolymerization initiator as the component (C) is preferably a value within the range of 0.2 to 20 parts by weight relative to 100 parts by weight of the total amount of the (A) component and the (B) component.
其理由係(C)成分之摻合量若成為未達0.2重量份之值，則缺乏聚合起始點，因此有難以使光擴散控制薄膜用組成物充分硬化之情況之故。另一方面，(C)成分之摻合量若成為超過20重量份之值，則有易產生光擴散控制薄膜之黃變或耐久性降低之情況之故。 The reason for this is that if the blending amount of the component (C) is less than 0.2 parts by weight, the polymerization starting point is lacking, and it may be difficult to sufficiently harden the composition for a light diffusion control film. On the other hand, when the compounding quantity of (C)component becomes a value exceeding 20 weight part, the yellowing of a light-diffusion control film or a durability fall may easily generate|occur|produce.
因此，(C)成分之摻合量下限值更好設為0.5重量份以上之值，又更好設為1重量份以上之值。 Therefore, the lower limit value of the blending amount of the component (C) is more preferably 0.5 part by weight or more, and more preferably 1 part by weight or more.
且，(C)成分之摻合量上限值更好設為15重量份以下之值，又更好設為10重量份以下之值。 And the upper limit of the compounding quantity of (C)component is more preferable to make it the value of 15 weight part or less, and it is more preferable to make it the value of 10 weight part or less.
又，在不損及本發明效果之範圍內，亦可適當摻合其他添加劑。 In addition, other additives may be appropriately blended within a range that does not impair the effects of the present invention.
作為其他添加劑舉例為例如抗氧化劑、抗靜電劑、聚合促進劑、聚合抑制劑、紅外線吸收劑、紫外線吸收劑、可塑劑、稀釋溶劑及調平劑等。 Examples of other additives include antioxidants, antistatic agents, polymerization accelerators, polymerization inhibitors, infrared absorbers, ultraviolet absorbers, plasticizers, diluents, and levelers.
又，其他添加劑之含量，一般相對於(A)成分及(B)成分之合計量100重量份，較好設為0.01~5重量份之範圍內之值。 In addition, the content of other additives is generally preferably set to a value within the range of 0.01 to 5 parts by weight with respect to 100 parts by weight of the total amount of (A) component and (B) component.
且，尤其較好摻合紫外線吸收劑作為其他添加劑。 Also, it is particularly preferable to incorporate an ultraviolet absorber as other additives.
其理由為藉由摻合紫外線吸收劑，而照射活性能量線時，可於特定範圍內選擇性吸收特定波長之活性能量線之故。 The reason for this is that when the active energy ray is irradiated by blending the ultraviolet absorber, the active energy ray of a specific wavelength can be selectively absorbed within a specific range.
其結果，不會阻礙光擴散控制薄膜用組成物之硬化，而可如例如圖5(b)所示，於所得光擴散控制薄膜10c之內部形成之特定內部構造產生彎曲部16之故。
As a result, as shown in FIG. 5( b ), the bending
又，紫外線吸收劑較好為自由羥基苯基三嗪系紫外線吸收劑、苯并***系紫外線吸收劑、二苯甲酮系紫外線吸收劑及羥基苯甲酸酯系紫外線吸收劑所成之群中選擇之至少一種。 Further, the ultraviolet absorber is preferably a group consisting of a free hydroxyphenyltriazine-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and a hydroxybenzoate-based ultraviolet absorber. At least one of the selected.
其理由係若為該等紫外線吸收劑，則可於特定內部構造中更明確產生彎曲，故所得光擴散控制薄膜中之光擴散特性之範圍可更有效地擴大之故。 The reason for this is that in the case of these ultraviolet absorbers, the curvature can be more clearly generated in a specific internal structure, so that the range of the light-diffusion properties in the obtained light-diffusion control film can be expanded more effectively.
亦即，若為於高壓水銀燈之主波長的365nm之波長於更接近部位具有波峰之該等紫外線吸收劑，則即使為少的摻合量，亦可確認產生彎曲之故。 That is, in the case of these ultraviolet absorbers having a peak at a position closer to the wavelength of 365 nm, which is the main wavelength of the high-pressure mercury lamp, even a small amount of blending can be confirmed that bending occurs.
且，光擴散控制薄膜用組成物中之紫外線吸收劑之摻合量，相對於(A)成分及(B)成分之合計量100重量份，較好為未達2重量份之值(但0重量份除外)。 Furthermore, the blending amount of the ultraviolet absorber in the composition for the light diffusion control film is preferably less than 2 parts by weight with respect to 100 parts by weight of the total amount of (A) component and (B) component (but 0 except parts by weight).
其理由係若紫外線吸收劑之摻合量成為2重量份以上之值，則會阻礙光擴散控制薄膜用組成物之硬化，於薄膜表面產生收縮皺褶，或有無法完全硬化之情況之故。另一方面，若紫外線吸收劑之摻合量過度少，則有對於光擴散控制薄膜之內部所形成之內部構造難以產生充分彎曲之情 況之故。 The reason for this is that when the blending amount of the ultraviolet absorber is 2 parts by weight or more, curing of the composition for light diffusion control film is inhibited, shrinkage wrinkles are generated on the surface of the film, or complete curing may not be possible. On the other hand, if the blending amount of the ultraviolet absorber is too small, it may be difficult to sufficiently bend the internal structure formed inside the light-diffusion control film. Because of the situation.
因此，紫外線吸收劑之摻合量下限值，相對於(A)成分及(B)成分之合計量100重量份，更好為0.01重量份以上之值，又更好為0.02重量份以上之值。 Therefore, the lower limit value of the blending amount of the ultraviolet absorber is preferably 0.01 part by weight or more, and more preferably 0.02 part by weight or more with respect to 100 parts by weight of the total amount of (A) component and (B) component. value.
又，紫外線吸收劑之摻合量上限值，相對於(A)成分及(B)成分之合計量100重量份，更好為1.5重量份以下之值，又更好為1重量份以下之值。 Moreover, the upper limit of the blending amount of the ultraviolet absorber is preferably 1.5 parts by weight or less, and more preferably 1 part by weight or less with respect to 100 parts by weight of the total amount of (A) component and (B) component. value.
步驟(b)係如圖6(a)所示，對步驟薄片2膜狀塗佈光擴散控制薄膜用組成物而形成塗佈層1之步驟。
Step (b) is a step of forming a
作為該步驟，可如第1實施形態所記載，使用通常之剝離薄膜。 As this step, as described in the first embodiment, a normal release film can be used.
又，作為於步驟薄片上塗佈光擴散控制薄膜用組成物之方法，可使用例如棒塗佈法、刮刀塗佈法、輥塗佈法、刮板塗佈法、模嘴塗佈法、凹版塗佈法等。 In addition, as a method of coating the composition for a light diffusion control film on the step sheet, for example, a bar coating method, a blade coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, and a gravure coating method can be used. coating method, etc.
又，此時之塗佈層厚度較好設為30~700μm之範圍內之值。 In addition, the thickness of the coating layer at this time is preferably set to a value within the range of 30 to 700 μm.
步驟(c)係如圖6(b)所示，對塗佈層1之露出面層合滿足關係式(1)之上覆層合薄膜4之步驟。
Step (c) is a step of laminating the overlying
亦即，步驟(c)係保有步驟薄片2與上覆層合薄膜4之間隙，以未按壓硬化前之塗佈層1之方式進行層合之步驟。
That is, step (c) is a step of laminating without pressing the
步驟(d)係如圖6(c)所示，邊使塗佈層1移動，邊透過上覆層合薄膜4，對該塗佈層1照射活性能量線(平行光等)60，而於薄膜內形成柱構造或百葉窗構造等之特定內部構造，作成光擴散控制薄膜10之步驟。
Step (d) is as shown in FIG. 6( c ), while the
以下，作為一例，針對照射平行光60，形成柱構造之情況加以說明。
Hereinafter, as an example, the case where the column structure is formed by irradiating the
亦即，如圖6(c)所示，對於步驟薄片2上形成之塗佈層1照射光線之平行度高的平行光60。
That is, as shown in FIG. 6( c ), the
此處，所謂平行光，意指光的行進方向於任一方向觀察時均不具有擴展之略平行之光。 Here, the term "parallel light" means substantially parallel light that does not have spread when viewed in any direction in the traveling direction of the light.
更具體而言，例如如圖6(c)所示，可將來自點光源102之照射光70藉由透鏡104而作成平行光60。
More specifically, as shown in FIG. 6( c ), for example, the irradiated light 70 from the point
又，照射光之平行度較好設為10°以下之值。 In addition, the parallelism of the irradiated light is preferably set to a value of 10° or less.
其理由係藉由將照射光之平行度設為該範圍內之值，可有效率且穩定地形成柱構造之故。 The reason for this is that the column structure can be efficiently and stably formed by setting the parallelism of the irradiated light to a value within this range.
因此，照射光之平行度更好設為5°以下之值，又更好設為2°以下之值。 Therefore, the parallelism of the irradiated light is preferably set to a value of 5° or less, and more preferably set to a value of 2° or less.
又，作為照射光之照射角，如圖7所示，於將對於塗佈層1的表面之法線的角度設為0°時之照射角θX通常較好設為-80~80°之範圍內之值。
In addition, as the irradiation angle of the irradiation light, as shown in FIG. 7 , the irradiation angle θ X when the angle with respect to the normal to the surface of the
其理由係若照射角成為-80~80°之範圍外之值，則於塗佈層1表面之反射等的影響變大，有難以充分形成柱構
造之情況之故。
The reason for this is that when the irradiation angle is outside the range of -80° to 80°, the influence of reflection on the surface of the
又，圖7中之箭頭MD係指塗佈層之移動方向。 In addition, the arrow MD in FIG. 7 shows the moving direction of a coating layer.
又，作為活性能量線的照射光較好使用紫外線。 In addition, ultraviolet rays are preferably used as the irradiation light for the active energy rays.
其理由係為電子束之情況，由於聚合速度非常快，因此於聚合過程中(A)成分與(B)成分無法充分相分離，而有難以形成柱構造之情況之故。另一方面，與可見光相比較時，由於藉由紫外線照射而可硬化之紫外線硬化樹脂或可使用之光聚合起始劑之變化較為豐富，故可增廣(A)成分及(B)成分之選擇幅度。 The reason for this is that in the case of electron beams, since the polymerization rate is very high, the (A) component and the (B) component cannot be sufficiently phase-separated during the polymerization process, and it may be difficult to form a column structure. On the other hand, compared with visible light, since the change of the ultraviolet curable resin that can be cured by ultraviolet irradiation or the photopolymerization initiator that can be used is more abundant, the difference between the components (A) and (B) can be increased. Choose the magnitude.
又，作為於使用紫外線作為活性能量線時之照射條件，於塗佈層表面之峰值照度較好設為0.1~10mW/cm2之範圍內之值。 Moreover, as irradiation conditions when using an ultraviolet-ray as an active energy ray, it is preferable to set the peak illuminance on the surface of a coating layer to the value within the range of 0.1-10mW/cm< 2 >.
其理由為該峰值照度若為未達0.1mW/cm2之值，則有難以明確形成柱構造之情況之故。另一方面，該峰值照度若為超過10mW/cm2之值，則推定為硬化速度過快，而有難以有效形成柱構造之情況之故。 The reason for this is that if the peak illuminance is a value less than 0.1 mW/cm 2 , it may be difficult to clearly form the column structure. On the other hand, if the peak illuminance is a value exceeding 10 mW/cm 2 , it is presumed that the hardening rate is too fast, and it may be difficult to effectively form a column structure.
因此，活性能量線照射中之塗佈層表面之峰值照度之下限值更好設為0.3mW/cm2以上之值，又更好設為0.5mW/cm2以上之值。 Therefore, the lower limit value of the peak illuminance on the surface of the coating layer in the active energy ray irradiation is more preferably a value of 0.3 mW/cm 2 or more, and more preferably a value of 0.5 mW/cm 2 or more.
活性能量線照射中之塗佈層表面之峰值照度之上限值更好設為8mW/cm2以下之值，又更好設為6mW/cm2以下之值。 The upper limit value of the peak illuminance on the surface of the coating layer in the active energy ray irradiation is more preferably a value of 8 mW/cm 2 or less, and more preferably a value of 6 mW/cm 2 or less.
又，於使用紫外線作為活性能量線時之塗佈 層表面之累積光量較好設為5~200mJ/cm2之範圍內之值。 Moreover, when using an ultraviolet-ray as an active energy ray, it is preferable to set the accumulated light quantity on the surface of a coating layer to the value within the range of 5-200mJ/cm< 2 >.
其理由為該累積光量若為未達5mJ/cm2之值，則有難以使柱構造自上方向下方充分伸長之情況之故。另一方面，該累積光量若為超過200mJ/cm2之值，則有所得光擴散控制薄膜產生著色之情況之故。 The reason for this is that if the accumulated light amount is a value of less than 5 mJ/cm 2 , it may be difficult to sufficiently extend the column structure from above to below. On the other hand, when the accumulated light amount is a value exceeding 200 mJ/cm 2 , the resulting light diffusion control film may be colored.
因此，活性能量照射線時之塗佈層表面之累積光量下限值更好設為7mJ/cm2以上之值，又更好設為10mJ/cm2以上之值。 Therefore, the lower limit value of the cumulative light intensity on the surface of the coating layer when irradiated with active energy is more preferably a value of 7 mJ/cm 2 or more, and more preferably a value of 10 mJ/cm 2 or more.
且，活性能量照射線時之塗佈層表面之累積光量上限值更好設為150mJ/cm2以下之值，又更好設為100mJ/cm2以下之值。 Furthermore, the upper limit value of the cumulative light intensity on the surface of the coating layer when irradiated with active energy is more preferably a value of 150 mJ/cm 2 or less, and more preferably a value of 100 mJ/cm 2 or less.
又，基於維持量產性並且穩定地形成柱構造之觀點，照射紫外線作為活性能量線時，步驟薄片上形成之塗佈層較好以0.1~10m/分鐘之範圍內之速度移動。 In addition, from the viewpoint of maintaining mass productivity and stably forming the column structure, when irradiating ultraviolet rays as active energy rays, the coating layer formed on the step sheet is preferably moved at a speed in the range of 0.1 to 10 m/min.
尤其更好以0.2m/分鐘以上之速度移動，且更好以8m/分鐘以下之速度移動。 In particular, it is more preferable to move at a speed of 0.2 m/min or more, and it is more preferable to move at a speed of 8 m/min or less.
又，本發明中，使光擴散控制薄膜用組成物硬化而成之光擴散控制薄膜內形成之內部構造若為包含高折射率區域及低折射率區域者，則並未限制於上述柱構造。 Moreover, in this invention, the internal structure formed in the light-diffusion control film which hardened the composition for light-diffusion control films is not limited to the above-mentioned column structure as long as it includes a high-refractive-index region and a low-refractive-index region.
例如形成如圖5(a)所示之百葉窗構造20b時，只要對於步驟薄片2上形成之塗佈層1，照射於一方向觀看時實質上為平行光且自其他方向觀看時看似非平行之雜亂光的光作為照射光即可。
For example, when forming the
又，形成如圖5(c)所示之特定內部構造20d時，只要對於步驟薄片2上形成之塗佈層1，照射於一方向觀看時實質上為平行光且自其他方向觀看時並非全部為雜亂光而是經調節至某程度平行度的光即可。
In addition, when forming the specific
以下藉由實施例更詳細說明本發明。但本發明不限定於該等記載。 The present invention will be described in more detail below by means of examples. However, the present invention is not limited to these descriptions.
準備厚度38μm、短邊方向(寬度方向)之長度1000mm之雙軸延伸聚對苯二甲酸乙二酯薄膜捲筒(以下有時稱「薄膜A」)作為上覆層合薄膜。 A biaxially stretched polyethylene terephthalate film roll (hereinafter sometimes referred to as "film A") having a thickness of 38 μm and a length of 1000 mm in the transversal direction (width direction) was prepared as a top laminate film.
測定所準備之上覆層合薄膜之配向角
亦即，將所準備之上覆層合薄膜之長邊方向中任意部位作為測定部位予以特定。 That is, any position in the longitudinal direction of the prepared overlying laminate film is specified as a measurement position.
其次，於經特定之測定部位中沿短邊方向1000mm，每50mm共20個部位作為測定點，使用王子測量機器(股)製之相位差測定裝置KOBRA-WR，測定以長邊方向為基準之慢軸方向之配向角
該圖8係以橫軸作為上覆層合薄膜之短邊方向的位置(mm)，縱軸作為配向角
且，由所得測定值，算出配向角(
又，測定所準備之上覆層合薄膜之算術平均粗糙度Ra及最大***Rp。 In addition, the arithmetic mean roughness Ra and the maximum protuberance Rp of the prepared overlying laminate film were measured.
亦即，使用Veeco公司製之表面形狀測定裝置WYKO NT110(ANSI B46.1規格)，依據ANSI B46.1測定所準備之上覆層合薄膜之算術平均粗糙度(Ra)(nm)，並且依據ANSI B46.1測定最大***(Rp)(nm)。所得結果示於表1。 That is, the arithmetic mean roughness (Ra) (nm) of the prepared overlying laminate film was measured according to ANSI B46.1 using the surface profile measuring apparatus WYKO NT110 (ANSI B46.1 specification) manufactured by Veeco, and according to ANSI B46.1 determines the maximum rise (Rp) (nm). The obtained results are shown in Table 1.
又，測定所準備之上覆層合薄膜之濁度。 Further, the haze of the prepared overlying laminate film was measured.
亦即，使用日本電色工業(股)製之濁度計NDH 5000，測定所準備之上覆層合薄膜之濁度(%)及全光線透過率。所得結果示於表1。 That is, the haze (%) and total light transmittance of the prepared overlying laminate film were measured using a turbidity meter NDH 5000 manufactured by Nippon Denshoku Kogyo Co., Ltd. The obtained results are shown in Table 1.
於容器內對於作為(B2)成分之重量平均分子量9,200之聚丙二醇(PPG)1莫耳，收納作為(B1)成分之異佛酮二異氰 酸酯(IPDI)2莫耳及作為(B3)成分之甲基丙烯酸2-羥基乙酯(HEMA)2莫耳後，依據常用方法進行反應，獲得作為(B)成分之重量平均分子量9,900之聚醚胺基甲酸酯甲基丙烯酸酯。 With respect to 1 mol of polypropylene glycol (PPG) having a weight-average molecular weight of 9,200 as the component (B2), isophorone diisocyano as the component (B1) was placed in the container After 2 moles of acid ester (IPDI) and 2 moles of 2-hydroxyethyl methacrylate (HEMA) as the component (B3), the reaction was carried out according to a common method to obtain a polymer with a weight average molecular weight of 9,900 as the component (B). Ether urethane methacrylate.
又，聚丙二醇及聚醚胺基甲酸酯甲基丙烯酸酯之重量平均分子量係藉凝膠滲透層析(GPC)按下述條件測定之聚苯乙烯換算值。 In addition, the weight average molecular weight of polypropylene glycol and polyether urethane methacrylate is a polystyrene conversion value measured by gel permeation chromatography (GPC) on the following conditions.
．GPC測定裝置：TOSOH(股)製，HLC-8020 . GPC measurement device: TOSOH (stock) system, HLC-8020
．GPC管柱：TOSOH(股)製(以下記載為通過順序) ． GPC column: TOSOH (stock) system (the following is the order of passage)
TSK防護管柱HXL-H TSK guard column HXL-H
TSK gel GMHXL(×2) TSK gel GMHXL (×2)
TSK gel G2000HXL TSK gel G2000HXL
．測定溶劑：四氫呋喃 . Assay solvent: tetrahydrofuran
．測定溫度：40℃ . Measurement temperature: 40℃
其次，添加作為(A)成分之上述式(3)表示之分子量268之丙烯酸鄰-苯基苯氧基乙氧基乙酯(新中村化學(股)製，NK ESTER A-LEN-10)62.5重量份及經合成之作為(B)成分之重量平均分子量9,900之聚醚胺基甲酸酯甲基丙烯酸酯37.5重量份、對於(A)成分及(B)成分之合計量=100重量份之作為(C)成分之2-羥基-2-甲基-1-苯基丙烷-1-酮1.25重量份後，於80℃之條件下進行加熱混合，獲得光擴散控制薄膜用組成物。 Next, o-phenylphenoxyethoxyethyl acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK ESTER A-LEN-10) 62.5 having a molecular weight of 268 represented by the above formula (3) was added as the component (A) Parts by weight and 37.5 parts by weight of polyether urethane methacrylate with a weight average molecular weight of 9,900 synthesized as component (B), the total amount of components (A) and (B) = 100 parts by weight After 1.25 parts by weight of 2-hydroxy-2-methyl-1-phenylpropan-1-one as the component (C), the mixture was heated and mixed at 80° C. to obtain a composition for a light-diffusion control film.
又，(A)成分及(B)成分之折射率係使用阿貝折射計(ATAGO(股)製，阿貝折射計DR-M2，Na光源，波長589nm)，依據JIS K0062測定後，分別為1.58及1.46。 In addition, the refractive index of (A) component and (B) component was measured according to JIS K0062 using an Abbe refractometer (manufactured by ATAGO Co., Ltd., Abbe refractometer DR-M2, Na light source, wavelength 589 nm), respectively. 1.58 and 1.46.
其次，邊基短邊方向長度1000mm之施以剝離處理之作為步驟薄片之透明聚對苯二甲酸乙二酯捲筒拉出邊於其剝離處理面塗佈所得之光擴散控制薄膜用組成物，形成膜厚60μm之塗佈層。 Next, a transparent polyethylene terephthalate roll with a length of 1000 mm in the short-side direction of the side base, which was subjected to peeling treatment as a step sheet, was pulled out and coated with the composition for light diffusion control film obtained on the peeling treated surface. A coating layer with a thickness of 60 μm was formed.
其次，對於塗佈層之露出面側，藉由輥對輥層合所準備之上覆層合薄膜。 Next, on the exposed surface side of the coating layer, the prepared overlying laminate film was laminated by roll-to-roll.
其次，如圖6(c)所示，使用紫外線平行光源(EYE GRAPHIC(股)製)，將平行度為2°以下之平行光以圖7所示之照射角θx大致成為10°之方式，對塗佈層照射。 Next, as shown in Fig. 6(c), an ultraviolet collimated light source (manufactured by EYE GRAPHIC) is used, and the parallel light with a parallelism of 2° or less is set so that the irradiation angle θx shown in Fig. 7 is approximately 10°, The coating layer is irradiated.
此時之峰值照度設為1.08mW/cm2，累積光量設為32.47mJ/cm2，燈高度設為1480mm，塗佈層之移動速度設為1.0m/分鐘。 At this time, the peak illuminance was set to 1.08 mW/cm 2 , the cumulative light amount was set to 32.47 mJ/cm 2 , the lamp height was set to 1480 mm, and the moving speed of the coating layer was set to 1.0 m/min.
又，上述峰值照度及累積光量係將安裝有受光器之UV計(EYE GRAPHIC(股)製，EYE紫外線累積照度計UVPF-A1)設置於塗佈層之位置而測定。 In addition, the above-mentioned peak illuminance and accumulated light quantity were measured by installing a UV meter (manufactured by EYE GRAPHIC, EYE Ultraviolet Accumulation Illuminance Meter UVPF-A1) equipped with a photoreceptor at the position of the coating layer.
又，光擴散控制薄膜之膜厚係使用定壓厚度測定器(寶製作所(股)製，TECLOCK PG-02J)測定。 In addition, the film thickness of the light-diffusion control film was measured using a constant-pressure thickness measuring device (manufactured by Takara Seisakusho Co., Ltd., TECLOCK PG-02J).
又，具有所得柱構造之光擴散控制薄膜於與塗佈層移動方向平行且與薄膜面正交之面切斷之剖面相片示於圖9(a)。 Moreover, the cross-sectional photograph of the light-diffusion-controlling film which has the obtained columnar structure at the plane parallel to the moving direction of the coating layer and perpendicular to the film surface is shown in Fig. 9(a).
又，膜厚方向之柱構造之長度為60μm，其傾斜角為7°。 In addition, the length of the column structure in the film thickness direction was 60 μm, and the inclination angle thereof was 7°.
且，光擴散控制薄膜之切斷係使用剃刀進行，剖面照片之拍攝係使用keyence製，數位顯微鏡VHX-1000藉由反射觀察而進行。 In addition, the cutting of the light-diffusion control film was performed using a razor, the photographing of the cross-sectional photograph was performed by the Keyence system, and the digital microscope VHX-1000 was performed by reflection observation.
測定所得光擴散控制薄膜之變角濁度。 The variable angle haze of the obtained light diffusion control film was measured.
亦即自所得步驟薄片/光擴散控制薄膜/上覆層合薄膜層合體之任意部位，切出沿長邊方向之短條狀試驗片(120mm寬)，使用東洋精機製作所(股)製，Haze Gard Plus測定變角濁度(%)。 That is, from any part of the obtained step sheet/light diffusion control film/overlay laminate film laminate, a short strip-shaped test piece (120 mm wide) along the longitudinal direction was cut out, and a Haze-shaped test piece (120 mm wide) was cut out along the longitudinal direction. Gard Plus measures variable angle turbidity (%).
此時，將積分球開口與光擴散控制薄膜之距離設為62mm，參考光之入射點設為試驗片之光擴散控制薄膜之短邊方向之中心點。 At this time, the distance between the opening of the integrating sphere and the light-diffusion control film was set to 62 mm, and the incident point of the reference light was set to the center point of the short-side direction of the light-diffusion control film of the test piece.
又，如圖10(a)所示，參考光係自試驗片之步驟薄片側入射，且使參考光之入射角度沿光擴散控制薄膜之長邊方向變化進行測定。所得結果示於圖10(b)之特性曲線A。 Furthermore, as shown in FIG. 10( a ), the reference light was incident from the step sheet side of the test piece, and the incident angle of the reference light was changed in the longitudinal direction of the light diffusion control film to measure. The obtained results are shown in the characteristic curve A of Fig. 10(b).
該圖10(b)係以橫軸作為參考光之入射角度(°)，縱軸作為變角濁度(%)之入射角度-變角濁度圖表。又，自圖10(b)算出濁度70%以上之入射角度區域之幅度，並示於表 1。 10( b ) is a graph of incident angle-variable angle haze with the horizontal axis as the incident angle (°) of the reference light, and the vertical axis as the variable angle haze (%). In addition, the width of the incident angle region where the haze is 70% or more was calculated from Fig. 10(b), and shown in the table 1.
因此，由特性曲線A，可確認光擴散程度隨入射角度而異之性質，亦即入射角度依存性(特性曲線B：實施例2，特性曲線C：比較例1亦同)。 Therefore, from the characteristic curve A, it was confirmed that the degree of light diffusion varies with the incident angle, that is, the incident angle dependence (characteristic curve B: Example 2, characteristic curve C: the same for Comparative Example 1).
測定所得光擴散控制薄膜之直進透過光強度。 The straight-through light intensity of the obtained light-diffusion control film was measured.
亦即，沿與變角濁度測定所用者同樣之試驗片之短邊方向1000mm，每50mm共20部位作為測定點，使用SUGA試驗機(股)製，變角測色計VC-2，測定直進透過光強度P.T(%)。 That is, along 1000 mm in the short side direction of the same test piece used for the variable-angle haze measurement, a total of 20 points per 50 mm were used as measurement points, using a variable-angle colorimeter VC-2 manufactured by SUGA testing machine (stock), and measured. Straight forward transmitted light intensity P.T (%).
此時，如圖11(a)所示，對於試驗片之步驟薄片側，自光擴散控制薄膜之柱狀物傾斜方向相反向傾斜60°之方向入射光而測定。所得結果示於圖11(b)之特性曲線A。 At this time, as shown in FIG. 11( a ), on the step sheet side of the test piece, light was incident from the direction opposite to the direction in which the columnar objects of the light diffusion control film were inclined by 60° and was measured. The obtained results are shown in the characteristic curve A of Fig. 11(b).
該圖11(b)係橫軸為光擴散控制薄膜之短邊方向的位置(mm)，縱軸為直進透過光強度(%)之短邊方向位置-直進透過光強度圖表。 11( b ) is a graph showing the position (mm) in the transversal direction of the light diffusion control film on the horizontal axis, and the transversal position-straight-forward transmissive light intensity on the vertical axis.
又，由所得測定值，算出直進透過光強度P.T之中央值(%)及偏差((P.Tmax-P.Tmin)/(P.Tmax+P.Tmin)×100)(%)。所得結果示於表1。 Furthermore, from the obtained measured values, the median value (%) and the deviation ((PT max -PT min )/(PT max +PT min )×100)(%) of the straight-forward transmitted light intensity PT were calculated. The obtained results are shown in Table 1.
實施例2中，除了作為上覆層合薄膜係使用厚度38μm、短邊方向之長度1000mm之雙軸延伸聚對苯二甲酸 乙二酯捲筒(以下有時稱為薄膜B)以外，與實施例1同樣製造層合體並評價。所得結果分別示於表1、圖8之特性曲線B、圖9(b)之剖面照片、圖10(b)之特性曲線B及圖11(b)之特性曲線B。 In Example 2, a biaxially stretched polyethylene terephthalic acid having a thickness of 38 μm and a length of 1000 mm in the short side direction was used as the top laminate film. A laminate was produced and evaluated in the same manner as in Example 1, except for the ethylene glycol roll (hereinafter, referred to as film B in some cases). The obtained results are shown in Table 1, the characteristic curve B in Fig. 8, the cross-sectional photograph in Fig. 9(b), the characteristic curve B in Fig. 10(b), and the characteristic curve B in Fig. 11(b), respectively.
比較例1中，除了作為上覆層合薄膜係使用厚度75μm、短邊方向之長度1000mm之雙軸延伸聚對苯二甲酸乙二酯捲筒(以下有時稱為「薄膜C」)以外，與實施例1同樣製造層合體並評價。所得結果分別示於表1、圖8之特性曲線C、圖9(c)之剖面照片、圖10(b)之特性曲線C及圖11(b)之特性曲線C。 In Comparative Example 1, a biaxially stretched polyethylene terephthalate roll (hereinafter sometimes referred to as "film C") having a thickness of 75 μm and a length of 1000 mm in the short side direction was used as the top laminate film. A laminate was produced and evaluated in the same manner as in Example 1. The obtained results are shown in Table 1, the characteristic curve C in Fig. 8, the cross-sectional photograph in Fig. 9(c), the characteristic curve C in Fig. 10(b), and the characteristic curve C in Fig. 11(b), respectively.
如以上所詳述，依據本發明，藉由將上覆層合薄膜面內之沿特定方向測定之慢軸方向之配向角的偏差設為特定範圍內之值，即使於未發生未形成內部構造區域之情況，或發生之情況，均可均一形成內部構造。 As described in detail above, according to the present invention, by setting the deviation of the alignment angle in the slow axis direction measured in the specific direction in the surface of the overlying laminate film to a value within a specific range, even if no internal structure is formed The situation of the area, or the situation that occurs, can uniformly form the internal structure.
其結果，可獲得光擴散特性不管薄膜面內部位為何均為均一的光擴散控制薄膜。 As a result, a light-diffusion control film having uniform light-diffusion properties regardless of the in-plane position of the film can be obtained.
因此，藉由本發明所得之光擴散控制薄膜期待可顯著有助於液晶顯示裝置或投影螢幕等之高品質化。 Therefore, it is expected that the light-diffusion control film obtained by the present invention can significantly contribute to the high quality of liquid crystal display devices, projection screens, and the like.
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