KR101197858B1 - Film, and process for preparing and use for the same - Google Patents

Abstract

The present invention is a film comprising a crystalline olefin (co) polymer, wherein the surface roughness Ra is 5 nm or less, and the haze is 1% or less.

Description

Film, its manufacturing method, and its use {FILM, AND PROCESS FOR PREPARING AND USE FOR THE SAME}

TECHNICAL FIELD This invention relates to the film obtained using a crystalline olefin (co) polymer, its manufacturing method, and its use.

The film which consists of a crystalline polyolefin type polymer is used for a release film etc. utilizing the characteristics, such as high melting | fusing point, favorable mold release property, and high transparency.

Patent Literature 1 enables a smooth molding of a synthetic resin plate without causing undesirable changes such as foaming, shrinkage, and turbidity, made of poly4-methyl-1-pentene, and furthermore, after molding, A surface protection film which can be easily peeled is disclosed.

Patent Document 2 discloses a retardation compensating sheet having properties similar to the temperature change of optical properties of a liquid crystal, having a uniform multiaxial orientation in the sheet plane direction, and widening the viewing angle in which only the refractive index in the sheet thickness direction is changed.

Patent Document 3 discloses a polarizing plate protective film having little change in birefringence, hardly generating carbonization deterioration in melt molding, and furthermore having no color unevenness when used as a protective film for a polarizing film of a liquid crystal display, and having excellent contrast. have.

Patent Document 1: Japanese Patent Application Laid-Open No. 5-302068

Patent Document 2: Japanese Patent Application Laid-Open No. 4-284402

Patent Document 3: Japanese Patent Application Laid-Open No. 2000-275433

DISCLOSURE OF INVENTION

Problems to be solved by the invention

By the way, the use of a transparent optical film is calculated | required further improvement of transparency, and as one solution for that, the film with little unevenness | corrugation of a surface and low haze is calculated | required. In view of the above, in a film made of crystalline olefin (co) polymers such as (co) polymer of 4-methyl-1-pentene, which has high transparency, the glass transition point (Tg) is low and the difference between the melting temperature and Tg is large. Is common. For this reason, unevenness | corrugation easily arises on the film surface after molding. Moreover, in the film which consists of crystalline olefin (co) polymer, the interface of a crystal and an amorphous exists, haze value becomes large by light scattering in this interface.

It cannot be said that the film of the viewpoint which implement | achieves such a high transparency in any of the above-mentioned patent documents is disclosed, and even these films were difficult to use as a transparent optical film.

Then, an object of this invention is to provide the film which consists of crystalline olefin (co) polymer suitable for the use as a transparent optical film, its manufacturing method, and its use.

Means for solving the problem

The present invention,

(1) A film comprising a crystalline olefin (co) polymer, wherein the surface roughness Ra is 5 nm or less, and the haze is 1% or less.

Hereinafter, (2)-(16) is each one of the preferable embodiment of this invention.

(2) The film according to the above (1), wherein the crystalline olefin (co) polymer is at least 1 selected from 4-methyl-1-pentene, 3-methyl-1-pentene, 3-methyl-1-butene It is a film obtained using a kind of olefin as a (co) polymerization component. The film characterized by the above-mentioned.

(3) The film according to the above (1) or (2), wherein the internal haze is 0.5% or less.

(4) The film as described in any one of said (1)-(3) WHEREIN: The water absorption measured according to JISK7209 method is 0.1% or less, The film characterized by the above-mentioned.

(5) The film according to any one of the above (1) to (4), wherein the water vapor transmission rate measured according to the JIS Z0208 method is 25 g / m ² / day or more.

(6) The film according to any one of the above (1) to (5), wherein the refractive index is 1.5 or less.

(7) The film according to any one of the above (1) to (6), wherein the direction in which the refractive index in the film plane is maximized is the X axis, the direction perpendicular to the X axis is Y axis, The in-plane retardation value Re = (nx-ny)? D at a wavelength of 590 nm when the refractive index at each wavelength of 590 nm is nx, ny and the film thickness of film is d is 5 nm or less.

(8) The film according to any one of the above (1) to (7), wherein the direction in which the refractive index in the film plane is maximized is the X axis, and the direction perpendicular to the X axis is the Y axis and the film. Retardation value Rth = | (nx + ny of thickness direction in wavelength 590nm when the thickness direction is set to Z-axis, and the refractive index in each wavelength of 590nm is nx, ny, nz, and the film thickness of film is d. ) / 2-nz |? D is 10 nm or less.

(9) The method for producing the film according to any one of the above (1) to (8), wherein the film made of the crystalline olefin (co) polymer is obtained by the glass transition temperature (Tg) of the crystalline olefin (co) polymer. And stretching at a temperature of not less than 120 ° C.).

(10) The manufacturing method of the film as described in said (9) WHEREIN: When forming molten resin into a film, it quenchs below Tg + 50 degreeC, The manufacturing method of the film characterized by the above-mentioned.

(11) A method for producing a film as described in (9), wherein a film made of a crystalline olefin (co) polymer is formed by a melt extrusion method, or subsequently, the film is pressed under compression. Method of preparation.

(12) The polarizing plate protective film using the film in any one of said (1)-(8).

(13) The optical compensation film using the film in any one of said (1)-(8).

(14) The release film using the film in any one of said (1)-(8).

(15) The protective film using the film in any one of said (1)-(8).

(16) The display element using the film in any one of said (1)-(8) and (12)-(15).

According to this invention, the film which consists of crystalline olefin (co) polymer suitable for the use as a transparent optical film, its manufacturing method, and its use are provided.

The above-mentioned objects, and other objects, features, and advantages are further clarified by the preferred embodiments described below, and the accompanying drawings attached thereto.

1 shows an example in which the film of the present embodiment is applied to a polarizing plate.

2 shows an example in which the film of the present embodiment is applied to an optical compensation film having a multilayer structure.

3 is a diagram illustrating an example of a configuration of a liquid crystal display device as a display device of the present embodiment.

Carrying out the invention  Best form for

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described.

The film of this embodiment is characterized by having a surface roughness Ra of 5 nm or less and a haze of 1% or less in a film made of a crystalline olefin (co) polymer.

The film of this embodiment consists of crystalline olefin (co) polymer. Here, "consist of" means both the case where all the films are comprised by the crystalline olefin (co) polymer, and when a part of the film is comprised by the crystalline olefin (co) polymer. Therefore, the film may or may not contain components other than the crystalline olefin (co) polymer. From the viewpoint of effectively realizing the effects of the present invention, the content of the crystalline olefin (co) polymer in the film is preferably 20 to 100% by weight, more preferably 50 to 100% by weight.

The crystalline olefin (co) polymer may be crystalline and transparent, and various crystalline olefin (co) polymers may be used, but for example, 4-methyl-1-pentene, 3-methyl-1-pentene, 3 The film which consists of a copolymer ((alpha)) obtained by using at least 1 sort (s) of olefin chosen from -methyl- 1-butene as a polymer component, or using these olefins as a copolymer component can be used preferably.

((Co) polymer (α))

The specific (co) polymer (α) preferably used in the film of the present invention is at least one selected from 4-methyl-1-pentene, 3-methyl-1-pentene and 3-methyl-1-butene It is obtained using an olefin as a (co) polymerization component. This particular olefin (co) polymer (α) is a homopolymer of 3-methyl-1-butene, 3-methyl-1-pentene or 4-methyl-1-pentene, or a copolymer of these mutually, further copolymerizable. Copolymers with monomers such as styrene, acrylonitrile, vinyl chloride, vinyl acetate, acrylic acid esters, methacrylic acid esters, and the like, or alternatively, blends with other thermoplastics or synthetic rubbers, block air The copolymer, graft copolymer, etc. can be illustrated. In the structural unit of the (co) polymer (α), the structural unit derived from 4-methyl-1-pentene, 3-methyl-1-pentene or 3-methyl-1-butene is usually 20 to 100 mol% in total, Preferably it is 50-100 mol%, More preferably, it is 80-100 mol%. When content of the structural unit derived from 4-methyl-1- pentene, 3-methyl-1- pentene, or 3-methyl-1- butene exists in the said range, resin excellent in the balance of various characteristics, such as transparency and heat resistance, will be obtained. It is preferable from a viewpoint of losing.

Among the (co) polymers (α), 4-methyl-1-pentene (co) polymers are preferred from the viewpoint of being excellent in transparency, peelability and the like and suitable for use in combination with an optical element. Moreover, 3-methyl-1- pentene (co) polymer and 3-methyl-1- butene (co) polymer are excellent in heat resistance, and are preferable from a viewpoint of freedom of a process, freedom of use conditions, etc.

(4-Methyl-1-pentene (co) polymer)

The 4-methyl-1-pentene (co) polymer which is particularly preferably used as the (co) polymer (α) which is preferably used in the present invention is specifically a homopolymer of 4-methyl-1-pentene or 4- Methyl-1-pentene and ethylene or other α-olefins having 3 to 20 carbon atoms, such as ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene , 1-hexadecene, 1-octadecene, 1-eicosene and the like. The 4-methyl-1-pentene (co) polymers preferably used in the present invention usually contain a structural unit derived from 4-methyl-1-pentene in an amount of 85 mol% or more, preferably 90 mol% or more. . There is no restriction | limiting in particular in the component other than 4-methyl-1- pentene origin which comprises 4-methyl-1- pentene (co) polymer, Various monomers copolymerizable with 4-methyl-1- pentene can be used suitably. However, ethylene or an α-olefin having 3 to 20 carbon atoms can be preferably used from the viewpoint of availability and copolymerization characteristics. Especially, the C7-20 alpha-olefin is preferable and 1-decene, 1-dodecene, 1- tetradecene, 1-hexadecene, and 1-octadecene are especially preferable.

Melt flow rate (MFR) of 4-methyl-1-pentene (co) polymer, which is preferably used in the present invention, measured under a load of 5 kg and a temperature of 260 ° C. according to ASTM D1238 is determined in various ways depending on the application. It is usually 1 to 50 g / 10 minutes, preferably 2 to 40 g / 10 minutes, and more preferably 5 to 30 g / 10 minutes. When the melt flow rate of 4-methyl-1-pentene (co) polymer is in the above range, the film formability and the appearance of the resulting film are good. Moreover, melting | fusing point is 100-240 degreeC, It is preferable to exist in the range of 150-240 degreeC preferably.

In addition, such 4-methyl-1-pentene (co) polymer can be prepared by a conventionally known method, for example, as described in Japanese Patent Application Laid-open No. 59-206418, and 4-methyl- in the presence of a catalyst. It can obtain by polymerizing 1-pentene and said ethylene or alpha-olefin.

(3-methyl-1-pentene (co) polymer)

Preferred comonomer species, comonomer content, MFR, melting point and the like of 3-methyl-1-pentene (co) polymers which are particularly preferably used as the (co) polymer (α) preferably used in the present invention are described above. The same applies to the case of 4-methyl-1-pentene (co) polymer. The 3-methyl-1-pentene (co) polymer preferably used in the present invention can be appropriately produced by a conventionally known method, and can be prepared by, for example, the method described in JP-A-06-145248. Can be.

(3-methyl-1-butene (co) polymer)

Preferred comonomer species, comonomer content, MFR, melting point and the like of 3-methyl-1-butene (co) polymers which are particularly preferably used as the (co) polymer (α) preferably used in the present invention are as described above. The same applies to the case of 4-methyl-1-pentene (co) polymer. The 3-methyl-1-butene (co) polymer preferably used in the present invention can be appropriately produced by a conventionally known method, and can be produced by, for example, the method described in JP-A-06-145248. Can be.

Here, "crystallinity" means that the crystallinity of the olefin (co) polymer is 10% or more. The degree of crystallinity is calculated from the integral intensity of the diffraction peaks of the amorphous portion and the crystalline portion obtained by the X-ray diffraction transmission method using the following equation.

Degree of crystallinity = (integral strength of amorphous part / amorphous and integral strength of crystalline part) × 100 (%)

Moreover, the surface roughness Ra of a film is 5 nm or less, Preferably it is 3 nm or less, and haze is 1% or less, Preferably it is 0.5% or less. Haze can be measured according to JISK7105 method. Here, haze is considered to be a sum of light scattering (outer haze) resulting from the unevenness | corrugation of a film surface and a back surface, and light scattering (internal haze) resulting from a change of refractive index, a foreign material, a defect, etc. in a film. Therefore, internal haze can be calculated | required by immersing a film in the solvent about the same refractive index as a measuring film, and making a measurement by making the reflectance in a film surface and a back surface substantially zero.

The internal haze of this film is 0.5% or less, preferably 0.2% or less.

The surface roughness Ra (center line average roughness) of the film used Ra value in three dimensions in a fixed area here. As the measuring method, a three-dimensional surface structure analysis microscope, a scanning laser microscope, an electron beam surface shape analyzer, a scanning probe microscope, a non-contact three-dimensional optical coherence surface roughness meter, and the like can be used. WYCO NT-2000 manufactured by Vico Instruments, Inc., which is an illuminance meter, was used. The Ra value was calculated by the following equation. That is, Ra was computed by carrying out the arithmetic mean of the absolute value of the height _Zjk (the height when the average value of height was made into the reference surface (height = 0)) calculated | required about each measuring point jk.

Here, M and N are the number of data corresponding to each direction in the sample plane orthogonal to the height direction, and correspond to the number of vertical and horizontal pixels if the detector is a CCD.

The film provided with such surface roughness and haze is excellent in transparency, and is suitable for the use of the transparent optical film especially mentioned later.

Moreover, it is preferable that the refractive index of a film is 1.5 or less. If the refractive index is low, since the reflectance of the surface is lowered, it is also preferable from the viewpoint of reducing the optical loss on the surface.

10 micrometers-300 micrometers are preferable, and, as for the film thickness of a film, 20 micrometers-200 micrometers are more preferable. When the thickness is 10 µm or more, wrinkles are less likely to enter during winding in a roll shape, and mechanical strength increases, so that breakage can be suppressed, which is preferable. Moreover, it becomes easy to wind up in roll shape by setting it as 300 micrometers or less. Moreover, when used for a polarizing plate protective film, an optical compensation film, etc., weight reduction and thinning are attained.

Further, the direction in which the refractive index in the film plane is maximized is the X axis, the direction perpendicular to the X axis is the Y axis, the refractive index at each wavelength of 590 nm is nx, ny, and the film thickness of the film is d. When it does, in-plane retardation value Re = (nx-ny) -d in wavelength 590nm is 5 nm or less, Preferably it is 3 nm or less.

In addition, the direction in which the refractive index in the film plane is maximized is the X axis, the direction perpendicular to the X axis is the Y axis, and the thickness direction of the film is the Z axis, and the refractive index at each wavelength 590 nm is nx, ny. , nz and the retardation value Rth = | (nx + ny) / 2-nz |? d of the thickness direction in wavelength 590nm when the film thickness of a film is set to d is 10 nm or less, Preferably it is 3 nm or less Do.

 When the values of retardation Re and Rth are in the above-mentioned range, when the polarizing plate and the optical compensation film using the said film are used for a liquid crystal display device, when the liquid crystal display surface is observed from the vertical direction, and when it is obliquely observed, Changes in contrast and color can be suppressed.

Moreover, as for the water absorption measured according to JISK7209 method of a film, It is more preferable that it is 0.1% or less, 0.05% or less preferably. When the water absorption is 0.1% or less, the dimensional change due to absorption becomes small, and warpage is less likely to occur when used as a polarizing plate protective film or an optical compensation film substrate, for example. In addition, condensation due to water vapor released in the film can be prevented.

Moreover, the cyclic polyolefin type film which is a conventional isotropic film has such a water absorption, and there exists also a thing with the small change of the dimension and optical characteristic by absorption. However, while such a cyclic polyolefin-based film is generally difficult to pass water vapor, it is preferable that the film of the present embodiment has, for example, a water vapor transmission rate of 25 g / m ² / day or more, preferably 45 g / m ² / day or more. It is easy. Since water vapor can be made to pass easily, it is useful, for example, in the use of a water-based adhesive having a small environmental load in adhesion with other materials, for example, a polarizing plate protective film. The water vapor transmission rate is measured according to the JIS Z0208 method.

That is, the film of this embodiment can be used suitably for the various uses of the conventional various isotropic film.

Moreover, the film of this embodiment may contain the plasticizer in the range which does not impair the objective of this invention. Examples of the plasticizer include mineral oils such as paraffinic, naphthenic and aroma, oligomers of α-olefins, cooligomers, ester plasticizers, various vegetable oils and animal oils. Such a plasticizer improves the moldability at the time of stretching.

In addition, the film of this embodiment may contain other resin, such as polyolefin, polyamide, polyester, etc.

Moreover, you may add the various compounding agents normally added and used for polyolefin, such as a weather stabilizer, a heat stabilizer, a slip agent, a nucleating agent, a pigment, and dye, in the range which does not impair the objective of this invention.

Particularly preferred methods for producing such films include films made of crystalline olefin (co) polymers formed by melt extrusion, solution casting, and the like, and the glass transition temperature of the crystalline olefin (co) polymer ( It is a manufacturing method including the process of extending | stretching at the temperature more than Tg) and less than 120 degreeC. Stretching temperature becomes like this. More preferably, they are Tg + 10 degreeC or more and 100 degrees C or less.

When extending | stretching temperature is Tg or more, since extending | stretching can be performed comparatively uniformly, without a break etc. occurring in a film, it is preferable. When extending | stretching temperature is less than 120 degreeC, since the haze of a film can be reduced especially effectively, it is preferable. Although the principle of being especially effective for reducing haze that extending | stretching temperature is less than 120 degreeC is not confirmed yet, since recrystallization temperature of olefin (co) polymers, such as poly 4-methyl-1- pentene, is about 120-170 degreeC, It is presumed that there is some relation with the suppression of the increase in crystallinity or crystal size which substantially raises the haze during the heating, stretching, and cooling at temperatures below this. For example, in an olefin (co) polymer having a structural unit derived from 4-methyl-1-pentene as a main component, the degree of crystallization and crystal size are about twice as high as before stretching at 40 ° C. In extending | stretching in ° C, it is considered that there is little change or decreases.

In the case of performing melt extrusion molding, specifically, the molding is performed at a predetermined cylinder temperature and a predetermined casting roll temperature with a single screw extruder, and then the drawing machine is at least a glass transition temperature (Tg) and is 120 ° C. or less, preferably 100. Stretch molding is carried out at a predetermined stretching speed by a predetermined magnification (preferably 5 times or less, particularly preferably 3 times or less) at a temperature equal to or less than ° C. In the sense of not increasing the degree of crystallinity or crystal size, it is preferable that the draw ratio is smaller and the draw speed is larger. In addition, you may perform extending | stretching by any of uniaxial stretching, biaxial stretching, etc. From the viewpoint of not increasing the crystallinity or crystal size, biaxial stretching is more preferably used than monoaxial stretching.

On the other hand, at this time, a film of a disc sheet may be produced once during melt extrusion molding, and the disc sheet may be supplied to an apparatus for stretching molding again, or melt extrusion molding and stretching molding may be performed continuously. good.

In addition, from the viewpoint of decreasing the crystallinity and crystal size, the molten resin may be quenched to Tg + 50 ° C. or lower, preferably Tg + 30 ° C. or lower on the casting roll when forming the molten resin into a film. Here, quenching (quick cooling) means lowering the temperature in a short time from the temperature at which crystallization proceeds to a temperature at which crystallization does not proceed substantially. Although it is difficult to quantify film-forming and positive resin temperature precisely, it is preferable to cool rapidly, for example to 100 degreeC / sec or more, More preferably, it is 200 degreeC / sec or more.

The film thus obtained becomes low surface roughness and low haze. Although this reason is not clear, it is considered as follows, for example.

By stretching the film formed by a predetermined method such as a melt extrusion method, a solution casting method, or the like in a predetermined temperature range, thermal deformation of the film formed during film forming to generate unevenness is caused by polymer chains in stretching molding. It is thought that this unevenness is reduced by reorientation and mitigation and correction. Furthermore, by quenching on the casting roll before extending | stretching the shape | molded film, it is thought that crystallinity falls and crystal grain diameter becomes small, and as a result, haze is considered to reduce further.

On the other hand, in the case of obtaining a film by melt extrusion molding, it may be pressurized and compressed between the rolls of the extruder simultaneously with or after molding, and the transparency of the film obtained thereby can be made higher.

Moreover, since the surface roughness and haze of the film of this embodiment exist in a predetermined range, and high transparency, it can be used suitably for the use of transparent optical films, especially a polarizing plate protective film, a peeling film, a protective film, an optical compensation film, etc. The present invention provides these transparent optical films. In addition, the optical compensation film may be a single layer structure using the film of this embodiment, and may be a multilayer structure which combined several films etc. which are mentioned later.

1 shows an example in which the film of the present embodiment is applied to a polarizing plate.

In this polarizing plate, the protective film 1 which protects a surface, the hard-coat layer 2 which provides abrasion resistance, etc. to a polarizing plate, the 2nd polarizing plate protective film 3, the polarizer 4, and the 1st The polarizing plate protective film 5, the adhesion layer 6 which acts as an adhesive layer with respect to another element, and the release film 7 which protects the adhesion layer 6 are laminated | stacked one by one.

Here, since the inspection operation of the display element with a polarizing plate, for example, a liquid crystal display element, is performed in the state which attached the protective film, the protective film 1 can use suitably the film excellent in the optical characteristics like this embodiment. . Since the 1st and 2nd polarizing plate protective films 5 and 3 are required to protect the polarizer 4 and high transparency, the film excellent in the optical characteristic like this embodiment can be used suitably. The peeling film 7 is provided in order to cover the adhesion layer 6 for further laminating | stacking an optical compensation film, retardation film (plate), etc. to the said polarizing plate at the time of formation of a display element, and the inspection operation of this polarizing plate peels. Since it is performed in the state which stuck the film 7, the film excellent in the optical characteristic like this embodiment can be used suitably.

2 shows the example which applied the film of this embodiment to the optical compensation film of a multilayered structure.

In this optical compensation film, the protective film 8 which protects a surface, the hard-coat layer 9 which provides abrasion resistance, etc. to an optical compensation film, the liquid crystal layer 10 which has a predetermined optical compensation function, and the liquid crystal layer 10 ), A pressure-sensitive adhesive layer 12 that acts as an adhesive layer to other elements, and a release film 13 that protects the pressure-sensitive adhesive layer 12 are sequentially stacked.

Also in the example of FIG. 2, as the protective film 8 and the peeling film 13, the film of this embodiment can be used suitably from a viewpoint mentioned above.

Moreover, this invention can use suitably the film mentioned above and the transparent optical film to which the said film was applied, a display element, such as a liquid crystal display element, an organic electroluminescent element, etc., This invention provides such a display element.

3 is a diagram illustrating an example of the configuration of a liquid crystal display device as such a display element.

In this liquid crystal display device, the polarizing plate 14, the retardation plate 15, the optical compensation film 16, the liquid crystal panel 17, the retardation plate 18, the polarizing plate 19, and the backlight unit 20 are sequentially It is stacked.

Here, as the polarizing plates 14 and 19, the polarizing plates to which this embodiment as shown in FIG. 1 is applied are used suitably. As the optical compensation film 16, a multilayer structure as shown in Fig. 2 can be suitably used, but a single layer structure in which the film of the present embodiment is applied as it is can be suitably used.

By such a configuration, incident light from the backlight unit 20 is polarized by the polarizing plate 19, only linearly polarized light is transmitted, and the phase of the polarized light is provided by the retardation plate 18 and is incident on the liquid crystal panel 17. . In the liquid crystal panel 17, an output image is formed, light for reproducing this image is generated and emitted, and the outgoing light is compensated for a viewing angle in the optical compensation film 16, and the phase difference plate 15 Phase difference is provided, the polarization is polarized on the polarizing plate 14, and the contrast is adjusted.

In addition, this invention is not limited to embodiment mentioned above and a specific example, It can change suitably in the range which does not deviate from the objective of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, the preferable form of this invention is concretely demonstrated, referring an Example / comparative example. In addition, this invention is not limited to a following example in any meaning.

In the Example / Comparative Example, various characteristics of the obtained film were measured by the following method.

(Film thickness)

It was measured by a tactile film thickness meter using a Mitsutoyo digital indicator (type: ID-F125).

(Surface roughness Ra)

Ra was calculated using a WYCO NT-2000 manufactured by Bico Instruments, Inc., a noncontact type three-dimensional optical interference surface roughness meter, at a measurement magnification of 20 times and a calculated area of 300 µm x 230 µm. On the other hand, the maximum measurement pixel of this measuring device is 736x480, and the resolution in a vertical direction is 0.1 nm or less.

(Hayes)

According to JIS K7105 method, it measured with the fully automatic haze meter (model: TC-HIIIDPK type) by Tokyo Denshoku Co., Ltd. make.

(Inside haze)

In the haze measurement, a quartz cell filled with silicone oil (Shin-Etsu Silicone Co., product name KF-96-100CS, refractive index 1.403) was installed as a liquid having a refractive index close to that of the film in the sample holder, and the sample was immersed in the measurement. It was.

(Water vapor permeability)

According to JIS Z0208 method, it measured on the conditions of 40 degreeCx90% RH using the moisture permeable cup of 60 mm (phi). Weighing was carried out at intervals of 24 hours using calcium chloride as the hygroscopic agent, and the mass increase per unit time was determined by two successive weighings, respectively, and the value when it was kept within 5% was used. The unit is g / m ² / day.

(Example 1)

As a crystalline olefin (co) polymer, TPX resin (trademark: MX020, MFR: 23 to 30 g / 10 min, refractive index: 1.46, melting point: 230 ° C.), glass transition, which is a copolymer obtained using 4-methyl-1-pentene. Using a temperature of 15 ° C. and a water absorption rate of 0.01% or less), melt extrusion molding was performed on a single-screw extruder (40 mm in diameter) under conditions of a cylinder temperature of 300 ° C. and a casting roll temperature of 30 ° C. to produce a film having a thickness of 120 μm. . Subsequently, this film was stretched about 3 times in the film flow direction (MD direction) by the stretching machine at the temperature of 60 degreeC, and the monoaxially stretched film whose film thickness is 40 micrometers was produced.

 Table 1 shows surface roughness Ra and haze of the obtained uniaxial stretched film. In addition, the water absorption of the film was the same as that of the resin used.

(Example 2)

As a crystalline olefin (co) polymer, TPX resin (trademark: MX020, MFR: 23 to 30 g / 10 min, refractive index: 1.46, melting point: 230 ° C.), glass transition, which is a copolymer obtained using 4-methyl-1-pentene. Using a temperature of 15 ° C. and a water absorption rate of 0.01% or less), melt extrusion was performed on a single-screw extruder (40 mm in diameter) under conditions of a cylinder temperature of 300 ° C. and a casting roll temperature of 80 ° C. to produce a film having a thickness of 120 μm. . Subsequently, this film was stretched about 2 times in the film flow direction (MD direction) by the stretching machine at the temperature of 80 degreeC, and the uniaxial stretched film whose film thickness is 60 micrometers was produced.

Table 1 shows surface roughness Ra and haze of the obtained uniaxial stretched film. In addition, the water absorption of the film was the same as that of the resin used.

(Example 3)

As a crystalline olefin (co) polymer, TPX resin (trademark: RT18, MFR: 23 to 30 g / 10 min, refractive index: 1.46, melting point: 239 ° C.), glass transition, which is a copolymer obtained using 4-methyl-1-pentene. Temperature: 22 ° C., water absorption: 0.01% or less), melt extrusion molding was performed under the conditions of a cylinder temperature of 300 ° C. and a casting roll temperature of 30 ° C. to produce a film having a thickness of 120 μm. At this time, the said film was pinched by the casting roll and the opposing touch roll. Subsequently, this film was stretched about 3 times in the film flow direction (MD direction) at the temperature of 60 degreeC with the drawing machine, and the monoaxially stretched film whose film thickness is 40 micrometers was produced.

 Table 1 shows surface roughness Ra and haze of the obtained uniaxial stretched film. In addition, the water absorption of the film was the same as that of the resin used.

(Comparative Example 1)

As a crystalline olefin (co) polymer, TPX resin (trademark: MX020, MFR: 23 to 30 g / 10 min, refractive index: 1.46, melting point: 230 ° C.), glass transition, which is a copolymer obtained using 4-methyl-1-pentene. Using a temperature of 15 ° C. and a water absorption rate of 0.01% or less), melt extrusion was performed on a single-screw extruder (40 mm in diameter) at a cylinder temperature of 300 ° C. and a casting roll temperature of 80 ° C. to produce a film having a thickness of 40 μm. .

 Table 1 shows surface roughness Ra and haze of the obtained film. In addition, the water absorption of the film was the same as that of the resin used.

(Comparative Example 2)

As a crystalline olefin (co) polymer, TPX resin (trademark: MX020, MFR: 23 to 30 g / 10 min, refractive index: 1.46, melting point: 230 ° C.), glass transition, which is a copolymer obtained using 4-methyl-1-pentene. Using a temperature of 15 ° C. and a water absorption rate of 0.01% or less), melt extrusion was carried out using a single screw extruder (40 mm in diameter) under a cylinder temperature of 300 ° C. and a casting roll temperature of 80 ° C. to produce a film having a thickness of 50 μm. .

 Table 1 shows surface roughness Ra and haze of the obtained film. In addition, the water absorption of the film was the same as that of the resin used.

(Comparative Example 3)

As a crystalline olefin (co) polymer, TPX resin (trademark: MX020, MFR: 23 to 30 g / 10 min, refractive index: 1.46, melting point: 230 ° C.), glass transition, which is a copolymer obtained using 4-methyl-1-pentene. Using a temperature of 15 ° C. and a water absorption rate of 0.01% or less), melt extrusion was performed on a single-screw extruder (40 mm in diameter) under conditions of a cylinder temperature of 300 ° C. and a casting roll temperature of 80 ° C. to produce a film having a thickness of 120 μm. .

 Table 1 shows surface roughness Ra and haze of the obtained film. In addition, the water absorption of the film was the same as that of the resin used.

(Comparative Example 4)

As a crystalline polyolefin (co) polymer, TPX resin (trademark: MX020, MFR: 23 to 30 g / 10 min, refractive index: 1.46, melting point: 230 ° C, glass), a copolymer obtained by using 4-methyl-1-pentene Using a transition temperature of 15 ° C. and a water absorption rate of 0.01% or less), melt extrusion molding was performed on a single-screw extruder (40 mm in diameter) at a cylinder temperature of 300 ° C. and a casting roll temperature of 80 ° C. to produce a film having a thickness of 120 μm. It was. Subsequently, this film was stretched about 3 times in the film flow direction (MD direction) by the stretching machine at the temperature of 160 degreeC, and the uniaxial stretched film whose film thickness is 40 micrometers was produced.

Table 1 shows surface roughness Ra and haze of the obtained uniaxial stretched film. In addition, the water absorption of the film was the same as that of the resin used.

(Comparative Example 5)

As a crystalline polyolefin-based (co) polymer, TPX resin (trademark: MX002O, MFR: 18 to 25 g / 10 min, refractive index: 1.46, melting point: 230 ° C), which is a copolymer obtained using 4-methyl-1-pentene. Using a glass transition temperature of 10 ° C. and a water absorption rate of 0.01% or less), melt extrusion molding was performed on a single-screw extruder (40 mm in diameter) under a cylinder temperature of 300 ° C. and a casting roll temperature of 80 ° C. to form a film having a thickness of 120 μm. Produced. Subsequently, this film was stretched about 2 times in the film flow direction (MD direction) by the stretching machine at 190 degreeC, and the uniaxial stretched film whose film thickness is 60 micrometers was produced.

Table 1 shows surface roughness Ra and haze of the obtained uniaxial stretched film. In addition, the water absorption of the film was the same as that of the resin used.

Claims (19)

In the film composed of the crystalline olefin (co) polymer, the surface roughness Ra is 5 nm or less, and the haze is 1% or less, When the direction in which the refractive index in the film plane becomes the largest is in the X axis, the direction perpendicular to the X axis is in the Y axis, and the refractive index at each wavelength of 590 nm is nx, ny and the film thickness of the film is d. In-plane retardation value Re = (nx-ny) -d in wavelength 590nm of is 5 nm or less, The said crystalline olefin (co) polymer obtained using at least 1 sort (s) of olefin chosen from 4-methyl-1- pentene, 3-methyl-1- pentene, 3-methyl-1- butene as a (co) polymerization component. A film, characterized in that. delete The method of claim 1, A film, characterized in that the internal haze is 0.5% or less. The method of claim 1, A water absorption measured according to the JIS K7209 method is 0.1% or less. The method of claim 1, The water vapor transmission rate measured according to JIS Z0208 method is 25 g / m <^2> / day or more, The film characterized by the above-mentioned. The method of claim 1, Refractive index is 1.5 or less, The film characterized by the above-mentioned. delete The method of claim 1, The direction in which the refractive index in the film plane is maximized is the X axis, the direction perpendicular to the X axis is the Y axis, and the film thickness direction is the Z axis, and the refractive indices at the wavelength of 590 nm are nx, ny, and nz. The retardation value Rth = | (nx + ny) / 2-nz |? D of the thickness direction in wavelength 590nm when the film thickness of a film is d is 10 nm or less. As a method of manufacturing the film as described in any one of Claims 1, 3-6, and 8. The film which consists of crystalline olefin (co) polymer is extended | stretched at the temperature which is more than glass transition temperature (Tg) of the said crystalline olefin (co) polymer, and is less than 120 degreeC. The manufacturing method of the film characterized by the above-mentioned. The method of claim 9, When forming molten resin into a film, it quenchs to below Tg + 50 degreeC, The manufacturing method of the film characterized by the above-mentioned. The method of claim 9, A method for producing a film, wherein the film made of crystalline olefin (co) polymer is formed by a melt extrusion method, or the pressure is subsequently compressed. The polarizing plate protective film containing the film of any one of Claims 1, 3-6, and 8. An optical compensation film comprising the film according to any one of claims 1, 3 to 6 and 8. The peeling film containing the film of any one of Claims 1, 3-6, and 8. The protective film containing the film of any one of Claims 1, 3-6, and 8. The display element containing the film as described in any one of Claims 1, 3-6, and 8, or the polarizing plate protective film containing this film. The display element containing the film as described in any one of Claims 1, 3-6, and 8, or the optical compensation film containing this film. The display element containing the film as described in any one of Claims 1, 3-6, and 8, or the peeling film containing this film. The display element containing the film as described in any one of Claims 1, 3-6, and 8, or the protective film containing this film.

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