JP2004224395A - Rolled-cellulose ester film package and method for storing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolled-cellulose ester film package preventing deterioration in performance when the rolled-cellulose ester film wound on a cylindrical winding core is stored and to provide a method for storing this rolled-cellulose ester film wrapper. <P>SOLUTION: This is a rolled-cellulose ester film wrapper in which a belt-likecellulose ester film is wound onto a cylindrical winding core and both a circumferential surface and a side surface of the rolled-cellulose ester film are covered and wrapped with a moisture-proof wrapping material. Moisture absorption member having as its base material moisture absorption agent is installed at the side surface and it is covered and wrapped with the moisture-proof wrapping material. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００７７】
各防湿包装材料の構成を以下に示す。
１−１：ＰＥＴ２０μｍ／アルミニウム蒸着膜／ＰＥ２０μｍ
１−２：ＰＥＴ１２μｍ／アルミニウム箔２８μｍ／ＰＥ１５μｍ
１−３：ＰＥ１００μｍ
１−４：ＰＥ５０μｍ
１−５：ＰＥ２０μｍ
上記、防湿包装材料は各層を、接着剤を使用し積層して作製した。尚、防湿包装材料の透湿度はＪＩＳ Ｚ ０２０８に準じて作製した値を示す。
【００７８】
（吸湿性部材の準備）
ロール状セルロースエステルフィルムの側面の９５％を覆う、図３に示されるドーナツ形状の厚さ１ｍｍの吸湿性部材を作製した。このとき、２枚の保持部材としては厚さ６０μｍのＰＥＴを使用し、各保持部材に直径０．５ｍｍの孔を６個／ｃｍ^２設けた。吸湿剤としては無水塩化カルシウムを使用した。吸湿剤の飽和吸湿率は、１１０質量％であった。
（包装体の作製）
作製したロール状セルロースエステルフィルムの両側面に、作製した吸湿性部材を装着し、表１に示す防湿包装材料を用いて図２に示す包装体を作製し、試料１０１〜１０５とした。尚、吸湿性部材を使用しない他は全て同じ条件で包装体を作製し、比較試料１０６〜１１０とした。
（評価）
作製した各試料１０１〜１１０を温度４０℃、湿度７０％の条件で１ヶ月間保管し、１００ｍを巻き出して切り取り、大きさ１００μｍの異物の付着数と発生した傷の数をルーペ（３倍）で観察し、ｍ^２に換算した結果を表２に示す。
【００７９】
【表２】

【００８０】
本発明の有効性が確認された。
実施例２
実施例１で作製した包装体の中で１０２を使用し、表３に示す保管条件を変化した保管試験２０１〜２２０を行った。尚、保管の期間は２週間とした。
【００８１】
（評価）
各保管試験２０１〜２２０の後に、実施例１と同じ方法、同じ項目につき評価を行った結果を表３に示す。
【００８２】
【表３】

【００８３】
試料Ｎｏ．２０１、２０６、２１２、２１６は異物の付着数、発生した傷の数が少なくて良いのであるが、保管条件は実用的ではない。本発明の有効性が確認された。
【００８４】
実施例３
（ロール状セルロースエステルフィルムの作製）
実施例１と同じロール状セルロースエステルフィルムを作製する時、表４に示す環境条件で巻き取り、ロール状セルロースエステルフィルムを作製し３０１〜３０６とした。
【００８５】
（包装体の作製）
作製したロール状セルロースエステルフィルムの両側面に実施例１で作製した吸湿性部材を装着し、実施例１で準備した防湿包装材料１−２を使用し図２に示す包装体を作製し、試料３０１〜３０６とした。
【００８６】
（評価）
作製した各試料３０１〜３０６を実施例１と同じ保管条件で保管した後、実施例１と同じ評価方法で評価した結果を表４に示す。
【００８７】
【表４】

【００８８】
本発明の有効性が確認された。
【００８９】
【発明の効果】
円筒状の巻き芯に巻き取られたロール状セルロースエステルフィルムの保管時の性能劣化を防止したロール状セルロースエステルフィルム包装体及びこのロール状セルロースエステルフィルム包装体の保管方法を提供することができ、ロール状セルロースエステルフィルムの品質が安定した。
【図面の簡単な説明】
【図１】ロール状セルロースエステルフィルムの製造方法の一例を示す模式図である。
【図２】図１に示される包装体の概略図である。
【図３】図２に示される吸湿性部材の概略図である。
【図４】偏光板の概略断面図である。
【符号の説明】
１０ 流延ダイ
１４ テンター搬送・乾燥部
１５ ロール搬送・乾燥部
１６ 巻き芯
１７ ロール状セルロースエステルフィルム
１８ 包装体
１８ａ 防湿性包装材料
１８ｂ 固定用部材
１８ｃ 吸湿性部材
１８ｂ４ 吸湿剤[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a rolled cellulose triacetate film package (hereinafter simply referred to as a rolled cellulose triacetate film) obtained by wrapping a rolled cellulose triacetate film wound around a core used for a protective film of a silver halide photographic material or a liquid crystal image display device with a moisture-proof packaging material. (Also referred to as a package) and its storage method.
[0002]
[Prior art]
Recently, the demand for liquid crystal display devices has been increasing due to the spread of liquid crystal displays for automobiles, displays of large liquid crystal televisions, mobile phones, notebook computers, and the like.
[0003]
As a basic configuration of this liquid crystal display device, a polarizing plate is provided on both sides of a liquid crystal cell. The polarizing plate transmits only light having a polarization plane in a certain direction. Therefore, in the liquid crystal display device, it plays an important role of visualizing the change in the orientation of the liquid crystal due to the electric field. That is, the performance of the liquid crystal display device largely depends on the performance of the polarizing plate. The general configuration of the polarizing plate will be described with reference to the drawings.
[0004]
FIG. 4 is a schematic sectional view of the polarizing plate. In the figure, reference numeral 1 denotes a polarizer, and protective films 2 are laminated on both sides of the polarizer 1. A liquid crystal display device is configured by laminating a polarizing plate having such a configuration on a liquid crystal cell.
[0005]
The protective film is provided for the purpose of improving the durability of the polarizer.Conventionally, as a polarizing plate protective film, cellulose resin, polycarbonate resin, polyarylate resin, polysulfone resin, polyethersulfone resin, norbornene resin, polystyrene resin Polyacrylate resins, polyester resins, etc. are known. Among these resins, in particular, cellulose ester films made of cellulose ester resins are transparent, have excellent birefringence, have low physical and mechanical properties. It is preferably used because it has a small dimensional change with respect to temperature and humidity.
[0006]
As a method for producing a cellulose ester film, a solution casting method in which a cellulose ester resin is dissolved in a solvent to form a film is used in order to prevent polymer orientation. Specifically, a dope obtained by dissolving a cellulose ester resin and various additives in a solvent is cast on an endless drum or band, and after being dried to some extent, the dried dope is further dried, wound up around a core, and rolled. In general, the product is packaged in a moisture-proof packaging material to form a product.
[0007]
In recent years, since the film is transported by applying tension during drying, orientation occurs in the film forming direction and birefringence develops, and a sufficient degree of polarization cannot be obtained. After the removal, a hot air drying method using a tenter described in JP-A-11-77719, JP-A-7-112446, and Japanese Patent Publication No. 5-19898 has come to be adopted.
[0008]
In recent years, cellulose ester films produced by such a method have been used for displays of large liquid crystal televisions, protective films for liquid crystal polarizing plates, and the like, and these have also been reduced in weight and thickness. Accordingly, the necessity of making the protective film of the polarizing plate thinner is increasing. In particular, when the cellulose ester film is stored and transported in a high-temperature, high-humidity environment, Mg compounds and Ca compounds are precipitated as crystalline foreign substances presumed due to the raw material of the cellulose ester film, and the surface of the cellulose ester film is damaged. It may look like
[0009]
In order to prevent these crystalline foreign substances from depositing on the surface of the cellulose ester film, JP-A-2000-313766 and JP-A-2000-314811 disclose cellulose ester in which the Mg compound and the Ca compound in the raw material are reduced. A film is disclosed.
[0010]
On the other hand, when stored and transported in a high-temperature, high-humidity environment, crystalline foreign matter is generated. Therefore, a roll-shaped cellulose ester film is formed using a moisture-proof packaging material in which aluminum, alumina, or the like wider than the width of the roll-shaped cellulose ester film is deposited. Is known. A package is known in which the peripheral surface of the roll is wound and covered, and the packaging material at both ends is bent along the both end surfaces of the roll-shaped cellulose ester film and fixed to a winding core (for example, see Patent Document 1).
[0011]
In the package described in Patent Document 1, although a certain improvement effect can be seen in suppressing generation of crystalline foreign matter, for example, in the case of a thin film product, the temperature is 35 to 45 ° C. and the humidity is 80 to 80 ° C. When stored at 90% RH for 0.5 to 1 month, crystalline foreign matter may be deposited inside the roll-shaped cellulose ester film. Although the temperature and humidity have been reduced during transportation and packaging materials have been devised, thin-film products are susceptible to external factors such as temperature and humidity due to their physical characteristics, and are prone to failure.
[0012]
For this reason, there is a demand for the development of a roll-shaped cellulose ester film package and a storage management method which are thin-film products and suppress generation of crystalline foreign matter during storage and transportation.
[0013]
[Patent Document 1]
JP 2001-106435 A
[0014]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a roll-shaped cellulose ester film package that prevents performance degradation during storage of a roll-shaped cellulose ester film wound around a cylindrical core. An object of the present invention is to provide a method for storing the rolled cellulose ester film package.
[0015]
[Means for Solving the Problems]
The above object of the present invention has been achieved by the following configurations.
[0016]
1) A roll-shaped cellulose ester film package in which a belt-shaped cellulose ester film is wound around a cylindrical core, and a peripheral surface and a side surface of the roll-shaped cellulose ester film in a roll state are covered with a moisture-proof packaging material. A roll-shaped cellulose ester film package, wherein a hygroscopic member using a hygroscopic agent as a base material is mounted on the side surface.
[0017]
2) The roll-shaped cellulose ester film package according to 1), wherein the desiccant has a saturated moisture absorption with respect to its own weight of 50 to 1000% by mass under an environment of a temperature of 25 ° C and a humidity of 90% RH. .
[0018]
3) The moisture-proof packaging material has a moisture permeability defined in JIS Z 0208 of 0.1 to 10 g / m. ² The roll-shaped cellulose ester film package according to 1) or 2), which is 24 h (40 ° C., 90% RH).
[0019]
4) The roll according to any one of 1) to 3), wherein the roll-shaped cellulose ester film is wound around a core at a temperature of 20 to 25 ° C and a humidity of 20 to 50% RH. Cellulose ester film package.
[0020]
5) The roll-shaped cellulose ester film package according to any one of 1) to 4), wherein the cellulose ester film of the roll-shaped cellulose ester film has a thickness of 20 to 60 µm.
[0021]
6) Storage of the rolled cellulose ester film package, wherein the rolled cellulose ester film package according to any one of 1) to 5) is stored under environmental conditions at a temperature of 20 to 45 ° C. Method.
[0022]
7) A roll-form cellulose ester film package characterized by storing the roll-form cellulose ester film package according to any one of 1) to 5) under environmental conditions of a humidity of 20 to 90% RH. Storage method.
[0023]
8) A roll wherein the roll-shaped cellulose ester film package according to any one of 1) to 5) is stored under environmental conditions of a temperature of 20 to 45 ° C and a humidity of 20 to 90% RH. Storage method for a fibrous cellulose ester film package.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment according to the present invention will be described with reference to FIGS. 1 to 3, but the present invention is not limited to this.
[0025]
FIG. 1 is a schematic view showing an example of a method for producing a roll-shaped cellulose ester film.
[0026]
In the figure, reference numeral 3 denotes a mixing tank for dissolving a cellulose ester resin in a solvent to produce a dope. Reference numeral 4 denotes a pump for transferring the dope prepared by the mixing tank 1, and reference numeral 5 denotes a dope stock tank sent by the transfer pump 4. Reference numeral 6 denotes a metering pump for feeding the dope in the stock tank 5 to the casting die 10. The dope sent by the metering pump 6 is supplied to the casting die 10 in a state where foreign substances in the dope are removed by the filtering devices 7, 8 and 9. The additive may be supplied between the filtration devices 7, 8, 9 and the casting die 10. In this case, it is preferable to provide a static mixer after supplying the additive.
[0027]
Reference numeral 11 denotes an endlessly running mirror belt-shaped metal casting belt (hereinafter, referred to as a belt) for casting the dope supplied from the casting die 10. Reference numeral 12 denotes a peeling point at which the dope cast on the belt 11 is peeled off from the solidified film, and reference numeral 13 denotes a peeled cellulose ester film. Reference numeral 14 denotes a tenter conveying / drying unit, 14a denotes an outlet, and 14b denotes a dry air intake. Reference numeral 15 denotes a roll conveying / drying unit, 15a denotes a drying box, 15b denotes a drying air intake, and 15c denotes an outlet. 15d indicates an upper transport roll, and 15e indicates a lower transport roll. The transport rolls 15d and 15e are composed of a plurality of sets, one set up and down. Reference numeral 17 denotes a roll-shaped cellulose ester film wound around a cylindrical winding core 16. The length wound on a single winding core is several hundred to several thousand m depending on the application and the equipment capacity, and thereafter, the package is packaged with a moisture-proof packaging material.
[0028]
FIG. 2 is a schematic view of the package shown in FIG. FIG. 2A is a schematic perspective view of the package. FIG. 2B is a schematic cross-sectional view along the line TT ′ of FIG.
[0029]
In the figure, reference numeral 18 denotes a package. The package 18 is made of a moisture-proof packaging material 18a for covering and surrounding the peripheral surface and both end surfaces of the roll-shaped cellulose ester film 17, and a moisture-absorbing material based on the hygroscopic agent attached to both end surfaces of the roll-shaped cellulose ester film 17. It has a member 18b, a fixing member 18c for fixing both ends of the moisture-proof packaging material 18a to the core 16, and a tape 18d for stopping the end of the moisture-proof packaging material 18a on the peripheral surface of the roll-shaped cellulose ester film 17. are doing. The hygroscopic member 18b will be described with reference to FIG.
[0030]
There is no particular limitation on the fixing member 18c, and examples thereof include a band, a string, and a rubber band. Of these fixing members, rubber bands that are easy to handle are preferable. The method for fixing both ends of the moisture-proof packaging material 18a to the core 16 with the fixing member 18c is not particularly limited. For example, both ends of the moisture-proof packaging material on the core are pressed at a plurality of locations by the fixing member. It may be fixed, or as shown in this figure, holding both ends of the moisture-proof packaging material on the winding core with the fixing member, and pushing the pressed portion into the side of the roll-shaped cellulose ester film, It may be a method of making it inside.
[0031]
The winding core 16 is not particularly limited as long as it is a material that does not allow moisture to pass through from the inside of the winding core and has strength, and examples thereof include aluminum and bakelite.
[0032]
The width of the moisture-proof packaging material 18a may be a width capable of covering the peripheral surface and both side surfaces of the roll-shaped cellulose ester film 17 and fixing both ends to the winding core in order to increase the moisture-proof property of the package. preferable.
[0033]
The moisture permeability of the moisture-proof packaging material 18a specified in JIS Z 0208 is 0.1 to 10 g / m. ² 24 h (40 ° C./90% RH) is preferred, and 0.1 to 5 g / m ² ・ 24 h (40 ° C./90% RH) is preferred, especially 0.1 to 5 g / m ² 24 h (40 ° C. 90% RH) is preferred. 0.1 g / m ² -When it is less than 24 hours (40 ° C., 90% RH), the cost may increase depending on the type of the moisture-proof packaging material. 10g / m ² -When it exceeds 24 hours (40 ° C, 90% RH), foreign substances may be deposited depending on the type of the roll-shaped cellulose ester film. When the moisture-proof packaging material 18a is wound around the peripheral surface of the roll-shaped cellulose ester film for coating and packaging, the number of windings is preferably 1 to 3 times. The thickness of the moisture-proof packaging material is preferably 10 to 100 μm, preferably 10 to 80 μm, more preferably 10 to 60 μm. Details of the moisture-proof packaging material will be described later.
[0034]
The roll-shaped cellulose ester film 17 is preferably wound around a core at a temperature of 20 to 25 ° C. and a humidity of 20 to 50% RH. By setting the winding conditions in these ranges, when the package is manufactured, the humidity inside the package can be stabilized. When the temperature is lower than 25 ° C. and the humidity is lower than 20% RH, it may be expensive to control the temperature and humidity in the process. When the temperature exceeds 25 ° C. and the humidity exceeds 50% RH, the water content of the roll-shaped cellulose ester film increases, and depending on the type of the roll-shaped cellulose ester film, foreign substances may be precipitated.
[0035]
FIG. 3 is a schematic view of the hygroscopic member shown in FIG. FIG. 3A is a schematic plan view of the hygroscopic member. FIG. 3B is a schematic sectional view of the hygroscopic member.
[0036]
The hygroscopic member 18b has two donut-shaped holding members 18b1 and 18b2, and a hygroscopic agent 18b4 sandwiched between the two holding members 18b1 and 18b2. The hygroscopic agent 18b4 may be sandwiched between two holding members 18b1 and 18b2 alone, may be impregnated into pulp molded into a donut shape, or the hygroscopic agent may be powdered and mixed with pulp to form a donut shape. It doesn't matter. It can be appropriately selected depending on the type of the moisture absorbent used.
[0037]
When the hygroscopic agent is used alone, the outer peripheral end and the inner peripheral end of the two donut-shaped holding members 18b1 and 18b2 need to be bonded to prevent the hygroscopic agent 18b4 from spilling.
[0038]
Reference numeral 18b11 denotes a surface (hereinafter, referred to as an inner surface) in contact with the end surface of the roll-shaped cellulose ester film, and reference numeral 18b21 denotes a surface (hereinafter, referred to as an outer surface) facing the inner surface 18b11. Reference numeral 18b3 denotes a moisture absorption hole provided on the inner surface 18b11 to prevent water from entering from the end surface of the roll-shaped cellulose ester film. The shape of the moisture absorbing hole is not particularly limited, and examples thereof include a circle, a triangle, and a square. This figure shows the case of a round shape. In the case of a round shape, the diameter is preferably from 0.01 to 10 mm, more preferably from 0.05 to 5 mm. The number is 1 to 50 pieces / cm ² Is more preferable, and more preferably 1 to 20 pieces / cm ² It is. The moisture absorption holes may be provided on the outer surface 18b21.
[0039]
Reference numeral 18b5 denotes a slit provided for facilitating attachment of the hygroscopic member 18b to the end face of the roll-shaped cellulose ester film. In the case of mounting on the end face of the roll-shaped cellulose ester film, the slit may be omitted in the case of passing the end of the core through the hole provided at the center of the hygroscopic member 18b.
[0040]
The material constituting the holding members 18b1 and 18b2 is not particularly limited. For example, a film, a nonwoven fabric, and a paper made of a thermoplastic resin such as polyethylene (PE), polyethylene terephthalate (PET), nylon (Ny), and polypropylene (PP) And the like. In the case of a nonwoven fabric, paper, or the like, which is a material through which moisture easily passes, it may not be necessary to provide a moisture absorption hole depending on the type of moisture absorbent used.
[0041]
L indicates the thickness of the holding member. The thickness L is preferably from 10 to 300 μm, more preferably from 20 to 200 μm, and particularly preferably from 20 to 100 μm. It is preferable that the two holding members 18b1 and 18b2 have the same thickness.
[0042]
M indicates the thickness (amount) of the moisture absorbent sandwiched between the two holding members 18b1 and 18b2. The thickness (amount) of the sandwiched moisture absorbent can be appropriately changed depending on the type of the moisture absorbent used. N indicates the thickness of the hygroscopic member. The thickness N can be appropriately changed depending on the type of the moisture absorbent used.
[0043]
The moisture absorbing agent 18b4 preferably has a saturated moisture absorption with respect to its own weight of 50 to 1000% by mass under an environment of 25 ° C. and 90% RH, particularly preferably 50 to 500% by mass. If the amount is less than 50% by mass, the effect of absorbing moisture is small, and foreign matter failure may occur. If it exceeds 1000% by mass, it is not practical.
[0044]
The saturated moisture absorption rate is determined by measuring the mass of the hygroscopic agent when the hygroscopic state becomes saturated in an environment of 25 ° C. and 90% RH under a 25 ° C./90% RH environment. The values are shown in terms of mass percentage with respect to mass.
[0045]
Examples of the moisture absorbent include activated alumina, anhydrous calcium sulfate, calcium oxide, anhydrous calcium chloride, anhydrous magnesium sulfate, and the like. Of these, anhydrous calcium chloride is particularly preferred.
[0046]
K indicates the diameter of the hygroscopic member 18b. The diameter K is preferably 95 to 100% of the diameter of the roll-shaped cellulose ester film. J indicates the diameter of the hole formed in the center of the hygroscopic member 18b. The diameter J is preferably 95 to 100% of the diameter of the winding core.
[0047]
The storage condition of the package shown in FIG. 2 in which the moisture absorbing member shown in FIG. 3 is attached to both sides of the roll-shaped cellulose ester film is as follows: 1) temperature 20 to 45 ° C., 2) humidity 20 to 90% RH, ) Temperature 20-45 ° C and humidity 20-90% RH. When the temperature is lower than 20 ° C., it is not preferable because the cost is required to maintain the storage conditions. If the temperature exceeds 45 ° C., the surface of the roll-shaped cellulose ester film may become uneven during storage or transportation, which is not preferable. If the humidity is less than 20% RH, it is not preferable because the cost for maintaining the storage conditions is high. If the humidity exceeds 90% RH, the appearance of the roll-shaped cellulose ester film may be deformed during storage or transportation, which is not preferable.
[0048]
By using the package shown in FIG. 2, even when stored in a conventional storage condition (for example, a temperature of 35 to 45 ° C. and a humidity of 80 to 90% RH) in which foreign matter is generated, no foreign matter is generated and the package is stable. It became possible to supply a roll-shaped cellulose ester film having a quality thickness of 20 to 60 μm.
[0049]
As the moisture-proof packaging material according to the present invention, various materials described in New Development of Functional Packaging Materials (Toray Research Center Co., Ltd.) can be used. For example, polyethylene-based resin, polypropylene-based resin, polyethylene terephthalate-based Resins, polyamide resins, ethylene-vinyl alcohol copolymer resins, ethylene-vinyl acetate copolymer resins, acrylonitrile-butadiene copolymer resins, cellophane resins, vinylon resins, vinylidene chloride resins, and the like. The resin such as a polypropylene-based resin and a nylon-based resin may be stretched, and may be further coated with a vinylidene chloride-based resin. In addition, low-density or high-density polyethylene resins can be used.
[0050]
Among the above polymer materials, Ny, nylon (KNy) coated with vinylidene chloride (PVDC), undrawn polypropylene (CPP), expanded polypropylene (OPP), polypropylene (KOP) coated with PVDC, PET, PVDC It is preferable to use coated cellophane (KPT), polyethylene-vinyl alcohol copolymer (EVAL), low density polyethylene (LDPE), high density polyethylene HDPE, and linear low density polyethylene (LLDPE). As the thermoplastic film, a multilayer film formed by co-extrusion with a different kind of film or a multilayer film formed by laminating at different stretching angles can be used as required. Furthermore, it is of course possible to combine the density and molecular weight distribution of the film used to obtain the required physical properties of the packaging material.
[0051]
Further, a polymer material in which these thermoplastic films are bonded to an aluminum foil or a polymer material having a vapor-deposited layer on which an inorganic compound is vapor-deposited can also be used. As vapor deposition layers, thin film handbooks p879 to p901 (Japan Society for the Promotion of Science), vacuum technology handbooks p502 to p509, p612, p810 (Nikkan Kogyo Shimbun), vacuum handbooks revised editions p132 to p134 (ULVAC Japan Vacuum Technology KK) And inorganic films as described in (1).
[0052]
Examples of the inorganic film include a metal deposited film and an inorganic oxide deposited film. Examples of the metal deposition film include ZrN, SiC, TiC, and Si. ₃ N ₄ , Single crystal Si, ZrN, PSG, amorphous Si, W, aluminum, etc., and a particularly preferred metal vapor deposition film is, for example, aluminum.
[0053]
As the inorganic oxide deposited film, for example, SiO 2 _x (X: 1 or 2), Cr ₂ O ₃ , Ta ₂ O ₃ , AI ₂ O ₃ Are used. Of these, preferred inorganic oxide vapor-deposited films include SiO 2 from the viewpoint of the strength of the vapor-deposited film. _x (X: 1 or 2), AI ₂ O ₃ Is mentioned.
[0054]
As a method of forming a vapor deposition film, a vacuum technology handbook and a packaging technology Vol29No. 8, for example, by a resistance or high-frequency induction heating method, an electron beam (EB) method, a plasma (PCVD) method, or the like. The thickness of the deposited film is preferably in the range of 40 to 200 nm, more preferably in the range of 50 to 180 nm.
[0055]
Examples of the thermoplastic resin film used as the base material of the deposited film include ethylene tetrafluoroethyl copolymer (ETFE), HDPE, 0PP, polystyrene (PS), polymethyl methacrylate (PMMA), biaxially stretched nylon (ONy), and PET. Film materials used for general packaging films, such as polycarbonate (PC), polyimide, and polyether styrene (PES) can be used.
[0056]
The multilayer film can be produced by a general coextrusion method, a dry lamination method, and the like as described in P707 to P716, edited by the Handbook of Plastics Processing Technology, The Society of Polymer Science, Japan.
[0057]
Specific examples of the moisture-proof packaging material using the multilayer film include the following, but are not limited thereto. In addition, the layer structure shown below represents the outermost layer / intermediate layer / the lowermost layer in contact with the roll-shaped cellulose ester film, respectively. Also, SiO _x ・ PET, Al ₂ O ₃ ・ PET is made of SiO on PET _x , Al ₂ O ₃ Represents what was vapor-deposited.
(1) OPP / SiO _x ・ PET / CPP
(2) OPP / SiO _x ・ PET / PE
(3) OPP / Al ₂ O ₃ ・ PET / CPP
(4) Al ₂ O ₃ ・ PET / Ny / CPP
(5) PET / Al ₂ O ₃ ・ PET / PE
(6) KOP / Ny / PE
(7) PE / KNy / PE
(8) KPT / PE / Ny / PE
(9) OPP / CPP
(10) PET / EVAL / PE
(11) OPP / EVAL / PE
(12) JP-A-5-72672, JP-A-5-281664, JP-A-5-281665, JP-A-6-186678, JP-A-6-317880, JP-A-7-82691, JP-A-7-134632, JP-A-10-133332 No. 2000-199939, JP-A-2001-305699, and JP-A-2001-31588.
These moisture-proof packaging materials can be appropriately selected and used according to the form of the package to be manufactured and the roll-shaped cellulose ester film to be used.
[0058]
The moisture-proof packaging material according to the present invention preferably uses carbon black to protect the roll-shaped cellulose ester film from ultraviolet rays. When carbon black is classified by raw material, gas furnace black, oil furnace black, channel black, anthracene black, acetylene black, Ketjen carbon black, conductive carbon black, thermal black, lamp black, oil smoke, pine smoke, animal black, vegetable There are black etc.
[0059]
Particularly preferred carbon black has a free sulfur content of 0 to 200 ppm, an average particle diameter of 10 to 120 μm, a pH of 6.0 to 9.0, an average particle diameter of 10 to 100 μm, an oil absorption of 60 to 200 ml / 100 g or more, Furnace carbon black having a volatile component of 0 to 3.0% is particularly preferred.
[0060]
The addition amount is preferably 0.05 to 20% by mass. The usage forms of carbon black include dry color, liquid color, paste color, master batch pellets, compound color pellets, granular color pellets, etc.The master batch method using master batch pellets is cost-effective and prevents workplace contamination. It is preferred in that respect. Japanese Patent Publication No. 40-26196 discloses a method for producing a polymer-carbon black masterbatch by separating carbon black into a solution of a polymer dissolved in an organic solvent. A method for preparing a masterbatch by dispersing in a polyethylene resin is described. Various pigments described in Pigment Handbook, pages 175 to 249, published by Seibundo Shinkosha Co., Ltd. are preferred as effective light-shielding substances in addition to carbon black.
[0061]
In addition, various additives such as an antistatic agent, a lubricant, an antioxidant, and a plasticizer can be added to the moisture-proof packaging material according to the present invention.
[0062]
In order to prevent dust from adhering to the roll-shaped cellulose ester film due to charging of the moisture-proof packaging material, the surface resistivity of the moisture-proof packaging material is 1 × 10 ⁵ ~ 1 × 10 ^Thirteen It is preferably Ω. The surface resistivity can be measured using a teraohm meter manufactured by Kawaguchi Electric Co., Ltd. according to the method described in JIS K6911.
[0063]
As a means for controlling the surface resistivity of the moisture-proof packaging material within the range of the present invention, it is preferable to use an antistatic agent. As the antistatic agent to be used, for example, it is preferable to include the antistatic agents described in JP-A-62-286042 and JP-A-2000-98545, and as the preferable antistatic agent, various surfactants can be used. . For example, representative examples of the nonionic surfactant are shown below. Polyethylene glycol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkylamine, polyoxyethylene alkylamine fatty acid ester, polyoxyethylene aliphatic alcohol ether, polyoxyethylene alkylphenyl ether, polyoxyethylene Glycerin fatty acid ester, polyoxyethylene aliphatic amine, sorbitan monofatty acid ester, fatty acid bentaerythrit, fatty alcohol ethylene oxide adduct, fatty acid ethylene oxide adduct, fatty acid amino or fatty acid amide ethylene oxide adduct, alkylphenol ethylene Oxide adduct, ethylene oxide adduct of alkyl naphthol, part of polyhydric alcohol Ethylene oxide adducts of fatty acid esters, polyoxyethylene alkyl amide, alkyl amine derivative, various non-ionic antistatic agent according to other Japanese Patent Publication No. 63-26697. Representative examples of the anionic surfactant are shown below. Ricinoleic acid sulfate soda salt, various fatty acid metal salts, silinoleic acid ester sulfate soda salt, sulfated ethyl aniline sulfate, olefin sulfate salt, oleyl alcohol sulfate soda salt, alkyl sulfate ester salt, fatty acid ethyl sulfonate , Alkyl sulfate, alkyl phosphate, alkyl sulfonate, alkyl naphthalene sulfonate, alkyl benzene sulfonate, succinate sulfonate, phosphate ester salt and the like. Representative examples of the cationic surfactant are shown below. Examples include amphoteric surfactants such as primary amine salts, tertiary amine salts, quaternary ammonium salts, trialkylbenzylammonium salts, and pyridine derivatives. In addition, it is possible to select and use the type and the amount of addition from various antistatic agents disclosed on pages 776 to 778 of the Plastic Data Handbook (KK Industrial Research Association, published on April 5, 1984).
[0064]
Among the above surfactants, it is particularly preferable to use a nonionic (nonionic) surfactant as an antistatic agent.
[0065]
The content of the antistatic agent is preferably 0.01 to 20% by mass, more preferably 0.05 to 10% by mass, and most preferably 0.10 to 1.0% by mass. When the content is less than 0.01% by mass, there is no effect of addition and only the kneading cost increases. On the other hand, when the total content exceeds 20% by mass, there is no effect of increasing the amount, and the cost only increases. Furthermore, the amount of bleed-out increases over time, and the surface of the roll-shaped cellulose ester film becomes sticky, which is not preferable. The method of adding these antistatic agents is not particularly limited, but it is preferable to knead them into a moisture-proof packaging material.
[0066]
As another means for suppressing electrification of the moisture-proof packaging material, it is also possible to change the surface roughness of the moisture-proof packaging material. For example, it is possible to set the surface roughness of the moisture-proof packaging material in the range of 5 to 100 μm (maximum height), preferably 10 to 30 μm (maximum height). If the maximum height is less than 5 μm, there is no antistatic effect, and if the maximum height exceeds 100 μm, a thin portion is formed and light-shielding properties are lost, which is not preferable. There is no particular limitation on the method for processing the surface roughness of the moisture-proof packaging material to 5 to 100 μm (maximum height), and for example, it can be processed by the method described in Plastic Processing Technology Handbook, Nikkan Kogyo Shimbun, pages 836 to 854. . The surface roughness represents the maximum height (Ry) specified in JIS B0601, and can be measured according to the measurement method described in JIS B0601, using a surfcom manufactured by Tokyo Seimitsu Co., Ltd. it can.
[0067]
Various known lubricants can be used as the lubricant. For example, there are silicone type, oleic acid amide type, erucamide type, stearic acid type, bisfatty acid type, alkylamine type, hydrocarbon type, fatty acid type, ester type, metal soap type, etc. Various lubricants are commercially available. The added amount of the lubricant is preferably 0.03 to 2% by mass.
[0068]
It is preferable to add an antioxidant in order to prevent the occurrence of bumps and fish eyes and to prevent coloring failure. Known antioxidants can also be used. For example, there are phenol-based, ketone amine-condensed, allylamine-based, imidazole-based, phosphite-based, thiourea-based, sulfur-based, phosphorus-based, thioether-based, and metal deactivators. Particularly preferred antioxidants are phenol-based oxidation agents. Commercially available products include Irganox of Ciba-Geigy and Sumilizer BHT, Sumilizer BH-76, Sumilizer WX-R, Sumilizer BP-101 of Sumitomo Chemical Co., Ltd. In addition, at least one of low volatility high molecular weight phenolic antioxidants (trade names Irganox 1010, Ireganolx 1076, Topanol CA, Ionox 330, etc.), dilauryl thiodipropionate, distearyl thiopropionate, dialkyl phosphate, etc. It is effective to use one kind, particularly at least two kinds in combination.
[0069]
It is preferable to use a phenolic antioxidant and a phosphorus antioxidant in combination, since the effect of the antioxidant is particularly excellent. The amount of addition is, for example, about 0.003 to about 2.0% by mass when added to the polyolefin-based resin adhesive layer or the light-shielding polyolefin-based resin film. If the amount is less than about 0.003% by mass, the effect of the addition is almost negligible. On the other hand, if the addition amount exceeds about 2.0% by mass, the photographic film utilizing the oxidizing and reducing actions may be adversely affected and abnormal photographic performance may occur. For this reason, it is preferable to add the antioxidant in the minimum amount that does not cause coloring failure, spots, or fish eyes.
[0070]
Various antioxidants disclosed on pages 794 to 799 of the Plastic Data Handbook (published by the KK Industrial Research Association) and various antioxidants disclosed on pages 327 to 329 of the Plastic Additives Data Book (published by KK Chemical Industry Co., Ltd.) And various antioxidants disclosed on pages 211-212 of LASTICS AGE ENCYCLOPEDIA Advanced Edition 1986 (published by KK Plastic Age) can be used selectively.
[0071]
As the plasticizer, for example, tallate ester, glycol ester, fatty acid ester, phosphate ester and the like can be used.
[0072]
The roll-shaped cellulose ester film according to the present invention is not particularly limited. For example, JP-A-2003-12859, JP-A-2003-12823, JP-A-2003-12822, JP-A-2003-11143, JP-A-2003-3009, JP-A-2002-370242, and JP-A-2002-2002 363342, 2002-292658, 2002-273747, 2002-248339, 2002-241511, 2002-187958, 2000-319412, 2000-314181, and 2000-313766. It is possible to do.
[0073]
【Example】
Hereinafter, the effects of the present invention will be specifically described with reference to Examples, but the present invention is not limited thereto.
[0074]
Example 1
(Preparation of rolled cellulose ester film)
Using the apparatus shown in FIG. 1, a cellulose ester film having a width of 1000 mm and a thickness of 40 μm was produced by a solution casting method, and a length of 3000 m was wound around an aluminum core at a temperature of 25 ° C. and a humidity of 50% RH. After winding, a roll-shaped cellulose ester film was produced.
[0075]
(Preparation of moisture-proof packaging material)
Table 1 shows moisture-proof packaging materials having different moisture permeability.
[0076]
[Table 1]

[0077]
The structure of each moisture-proof packaging material is shown below.
1-1: PET 20 μm / aluminum evaporated film / PE 20 μm
1-2: PET 12 μm / aluminum foil 28 μm / PE 15 μm
1-3: PE 100 μm
1-4: PE 50 μm
1-5: PE 20 μm
The moisture-proof packaging material was prepared by laminating each layer using an adhesive. Note that the moisture permeability of the moisture-proof packaging material is a value produced according to JIS Z 0208.
[0078]
(Preparation of hygroscopic member)
A doughnut-shaped hygroscopic member having a thickness of 1 mm as shown in FIG. 3 and covering 95% of the side surface of the roll-shaped cellulose ester film was produced. At this time, PET having a thickness of 60 μm was used as the two holding members, and each holding member was provided with six holes having a diameter of 0.5 mm / cm. ² Provided. Anhydrous calcium chloride was used as a hygroscopic agent. The saturated moisture absorption of the moisture absorbent was 110% by mass.
(Production of package)
The produced hygroscopic member was attached to both sides of the produced roll-shaped cellulose ester film, and the package shown in FIG. 2 was produced using the moisture-proof packaging material shown in Table 1 to obtain samples 101 to 105. A package was produced under the same conditions except that the hygroscopic member was not used, and Comparative Samples 106 to 110 were prepared.
(Evaluation)
Each of the prepared samples 101 to 110 was stored at a temperature of 40 ° C. and a humidity of 70% for one month, unwound and cut out of 100 m. ) And observe ² Table 2 shows the results of the conversion.
[0079]
[Table 2]

[0080]
The effectiveness of the present invention has been confirmed.
Example 2
Using 102 in the package produced in Example 1, storage tests 201 to 220 were performed in which the storage conditions shown in Table 3 were changed. The storage period was two weeks.
[0081]
(Evaluation)
After each of the storage tests 201 to 220, the same method and the same items as in Example 1 were evaluated, and the results are shown in Table 3.
[0082]
[Table 3]

[0083]
Sample No. In 201, 206, 212, and 216, the number of adhered foreign substances and the number of generated scratches may be small, but storage conditions are not practical. The effectiveness of the present invention has been confirmed.
[0084]
Example 3
(Preparation of rolled cellulose ester film)
When the same roll-shaped cellulose ester film as in Example 1 was produced, the film was wound up under the environmental conditions shown in Table 4 to produce a roll-shaped cellulose ester film, which was designated as 301 to 306.
[0085]
(Production of package)
The moisture-absorbing members prepared in Example 1 were attached to both sides of the prepared roll-shaped cellulose ester film, and the package shown in FIG. 2 was prepared using the moisture-proof packaging material 1-2 prepared in Example 1, and a sample was prepared. 301 to 306.
[0086]
(Evaluation)
After storing each of the manufactured samples 301 to 306 under the same storage conditions as in Example 1, the results of evaluation by the same evaluation method as in Example 1 are shown in Table 4.
[0087]
[Table 4]

[0088]
The effectiveness of the present invention has been confirmed.
[0089]
【The invention's effect】
It is possible to provide a roll-shaped cellulose ester film package and a method for storing the roll-type cellulose ester film package, which prevent performance degradation during storage of the roll-shaped cellulose ester film wound around the cylindrical core, The quality of the rolled cellulose ester film was stabilized.
[Brief description of the drawings]
FIG. 1 is a schematic view showing one example of a method for producing a roll-shaped cellulose ester film.
FIG. 2 is a schematic view of the package shown in FIG.
FIG. 3 is a schematic view of the hygroscopic member shown in FIG.
FIG. 4 is a schematic sectional view of a polarizing plate.
[Explanation of symbols]
10 Casting die
14 Tenter transport / drying section
15 Roll transport / drying section
16 winding core
17 Rolled cellulose ester film
18 Package
18a Moistureproof packaging material
18b Fixing member
18c hygroscopic member
18b4 hygroscopic agent

Claims (8)

A roll-shaped cellulose ester film package in which a belt-shaped cellulose ester film is wound around a cylindrical core, and a peripheral surface and a side surface of the rolled cellulose ester film in a roll state are covered with a moisture-proof packaging material and packaged. A roll-shaped cellulose ester film package, wherein a hygroscopic member having a hygroscopic agent as a base material is mounted thereon. The roll-shaped cellulose ester film package according to claim 1, wherein the desiccant has a saturated moisture absorption with respect to its own weight of 50 to 1000% by mass under an environment of a temperature of 25C and a humidity of 90% RH. The roll according to claim 1, wherein the moisture-proof packaging material has a moisture permeability defined in JIS Z 0208 of 0.1 to 10 g / m ² · 24 h (40 ° C./90% RH). Cellulose ester film package. The roll cellulose according to any one of claims 1 to 3, wherein the roll cellulose ester film is wound around a core at a temperature of 20 to 25 ° C and a humidity of 20 to 50% RH. Ester film package. The roll-shaped cellulose ester film package according to any one of claims 1 to 4, wherein the cellulose ester film of the roll-shaped cellulose ester film has a thickness of 20 to 60 µm. A method for storing a roll-shaped cellulose ester film package, comprising storing the roll-shaped cellulose ester film package according to any one of claims 1 to 5 under an environmental condition at a temperature of 20 to 45 ° C. A method for storing a roll-shaped cellulose ester film package, comprising storing the roll-shaped cellulose ester film package according to any one of claims 1 to 5 under an environmental condition of a humidity of 20 to 90% RH. . A roll-shaped cellulose, wherein the roll-shaped cellulose ester film package according to any one of claims 1 to 5 is stored under environmental conditions of a temperature of 20 to 45 ° C and a humidity of 20 to 90% RH. How to store the ester film package.

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