JP3699347B2 - Easy-adhesive laminated film for antireflection - Google Patents

Description

【００５７】
表１で塗布層中の各成分は下記の重合体または化合物を表わす。
ポリエステル：酸成分がテレフタル酸９０モル％／イソフタル酸４モル％／５−ナトリウムスルホイソフタル酸６モル％、グリコール成分がエチレングリコール９０モル％／ジエチレングリコール１０モル％のポリエステル共重合体（Ｔｇ＝７０℃）。
アクリル：構成成分がメチルメタクリレート５０モル％／エチルアクリレート４０モル％／Ｎ−メチロールアクリルアミド５モル％／２−ヒドロキシエチルメタクリレート５モル％のアクリル共重合体（Ｔｇ＝４０℃）。
ワックス：カルナバワックス
フィラー：シリカフィラー（平均直径：０．１μｍ）
濡れ剤：ポリオキシエチレン（ｎ＝７）ラウリルエーテル
【００５８】
次いで、この塗布フィルムを引き続いて９５℃で乾燥し、横方向に１２０℃で３．８倍に延伸し、２２０℃で幅方向に３％収縮させ熱固定し、厚さ１８８μｍの積層フィルムを得た。得られた積層フィルムの評価結果を表２に示す。なお、塗膜の厚さは０．１５μｍであった。また、積層フィルムは、クリーン度がクラス１０００の環境にて作成した。
【００５９】
［実施例４］
溶融ポリエチレン−２，６−ナフタレート（固有粘度：０．６０ｄｌ／ｇ、ガラス転移点：１２１℃）をダイより押出し、常法により冷却ドラムで冷却して未延伸フィルムとし、次いで縦方向に３．６倍に延伸した後、その両面に塗膜用組成物（表１の塗液１）の固形分濃度が８％の水性塗液をロールコーターで均一に塗布した。次いで、この塗布フィルムを引き続いて１０５℃で乾燥し、横方向に１４０℃で３．８倍に延伸し、２３０℃で幅方向に３％収縮させ熱固定し、厚さ１８８μｍの積層フィルムを得た。得られた積層フィルムの評価結果を表２に示す。なお、塗膜の厚さは０．１５μｍであった。また、積層フィルムはクリーン度がクラス１０００の環境にて作成した。
【００６０】
［比較例２］
クリーン度がクラス３０００の環境で積層フィルムを作成した以外は実施例３と同様に積層フィルムを作成した。得られた積層フィルムの評価結果を表２に示す。
【００６１】
［比較例３］
塗布層を設けない以外はすべて実施例１と同様に実施した。得られたフィルムの評価結果を表２に示す。
【００６２】
【表２】

【００６３】
表２に示す結果から明らかなように、本発明の反射防止用易接着性積層フィルムは画像鮮明性、透明性、滑り性、ハードコート層及び粘着剤層との接着性に優れたものであった。
【００６４】
【発明の効果】
本発明の反射防止用易接着性積層フィルムは、塗布層に光学異物となる欠点が無く、接着性、透明性、易滑性に優れたものであり、ＣＲＴ、ＬＣＤ、有機ＥＬ、ＰＤＰ等のディスプレイに使用される反射防止フィルムに有用である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-adhesive laminate film for antireflection, and more specifically, excellent adhesion, transparency, and ease in which an easy-adhesive coating film made of a specific composition is formed on at least one side of a polyester film. The present invention relates to an anti-adhesive laminated film for antireflection having slipperiness.
[0002]
[Prior art]
Polyester films, especially biaxially stretched films of polyethylene terephthalate and polyethylene naphthalate, have excellent mechanical properties, heat resistance, and chemical resistance, so magnetic tapes, ferromagnetic thin film tapes, photographic films, packaging films, electronic components It is widely used as a material for films for film, electrical insulating films, films for laminating metal plates, films to be attached to the surface of glass displays, protective films for various members, and the like.
[0003]
In recent years, polyester films have been widely used for various types of optics. For example, prism lens sheets for liquid crystal display members, base films such as touch panels and backlights, base films for antireflection films, and display explosion-proof (CRT explosions). It is used as a base film of a film for prevention of glass scattering when shrunk. Base films used for such optical applications are required to have excellent transparency and excellent easy adhesion to prism lenses, hard coat layers, pressure-sensitive adhesive layers, antireflection treatment layers, and the like.
[0004]
[Problems to be solved by the invention]
Polyester films generally have poor adhesion to other materials such as prism lenses and hard coat layers mainly composed of acrylic resins. For this improvement, polyester films, acrylic resins, urethane resins, etc. It has been proposed to laminate an easy-adhesion layer using a material (for example, JP-A-10-119215 and JP-A-2000-246855). However, the easy adhesion layer based on these proposals may have insufficient adhesion depending on the application. For example, a CRT film has good adhesion to the hard coat layer but poor adhesion to the adhesive layer on the opposite side. There are problems such as becoming sufficient.
[0005]
On the other hand, a polyester film is usually blended with a filler (lubricant) to improve slipperiness (easiness of slipperiness). However, a polyester film for an antireflection film used for display applications requires transparency. Therefore, it is necessary to minimize the amount of filler added. However, since the film surface becomes flat when the amount of filler added is small, the film sticks to each other when the film is wound or overlapped, and this sticking part is The problem which becomes the surface defect of a film occurs. Moreover, since the slipperiness | liquidity between films is bad, handling property is bad, and the problem that a film | membrane surface enters a film | membrane by film forming or a process process arises.
[0006]
In addition, the base film of the antireflection film used for display is laminated with an easy adhesion layer (coating layer) for the hard coat layer and the pressure-sensitive adhesive layer, and a resin having a low glass transition point is used for the easy adhesion layer. In particular, the problem of sticking between the films and slipperiness between the films becomes particularly remarkable.
[0007]
Furthermore, the presence of optical foreign matter in the coating layer causes a serious quality problem. This optical foreign matter can be applied to the coating layer in the manufacturing process or processing process by repelling the coating liquid due to foreign matter adhering to the film surface when coating the coating layer on the film, repelling due to the coating itself, or by agglomeration of the coating. This is due to scratches on the surface that enters.
[0008]
The object of the present invention is to solve the problems of the prior art and to provide a laminated film excellent in adhesive strength with a functional layer used in various optical applications, and excellent in transparency and slipperiness. .
[0009]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventor has formed an easy-adhesive coating layer on the surface of the polyester film, and the coating layer is a laminated film having no defects of the coating layer that becomes an optical foreign matter. As a result, the present inventors have found that the above problems can be solved, and have completed the present invention.
[0010]
That is, the present invention is (1) a laminated film in which a coating layer is formed on at least one side of a polyester film, and the coating layer has an optical foreign matter having a height difference of 0.5 μm or more and a maximum diameter of 0.5 μm or more. It is an easy-adhesion laminated film for reflection prevention characterized by not having the fault which becomes.
[0011]
Moreover, the preferable aspect of this invention is (2) Polyester resin and an acrylic resin are contained in a coating layer, The easily adhesive laminated film for reflection as described in (1), (3) A wax contains in a coating layer (1) or the antiadhesive laminated film for antireflection according to (2), (4) the antiadhesive for antireflection according to any one of (1) to (3), wherein a filler is contained in the coating layer (5) The antireflection easy-adhesive laminated film according to any one of (1) to (4), wherein the polyester film is mainly composed of polyethylene terephthalate and / or polyethylene-2,6-naphthalate. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0013]
(polyester)
In the present invention, the polyester constituting the polyester film is a linear saturated polyester synthesized from an aromatic dibasic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof.
[0014]
Specific examples of such polyesters include polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate, poly (1,4-cyclohexylenedimethylene terephthalate), polyethylene-2,6-naphthalate, and the like. It may be a coalescence or a blend of these with a small proportion of other resins. Of these, polyethylene terephthalate and polyethylene-2,6-naphthalate are particularly preferable because of a good balance between mechanical properties and optical properties.
[0015]
An appropriate filler can be blended with these polyesters as necessary. As the filler, those conventionally known as a slipperiness imparting agent for polyester films can be used. For example, calcium carbonate, calcium oxide, aluminum oxide, kaolin, silicon oxide, zinc oxide, carbon black, silicon carbide Tin oxide, crosslinked acrylic resin particles, crosslinked polystyrene resin particles, melamine resin particles, crosslinked silicone resin particles, and the like can be used. Furthermore, a colorant, an antistatic agent, an antioxidant, an organic lubricant, a catalyst and the like can be appropriately added to the polyester.
[0016]
(Polyester film)
The polyester film in the present invention is obtained by, for example, melt-extruding the polyester into a film and cooling and solidifying with a casting drum to form an unstretched film. The unstretched film is once or twice or more in the longitudinal direction at Tg to (Tg + 60) ° C. The film is stretched so that the total magnification is 3 to 6 times, and then stretched so that the magnification is 3 to 5 times in the width direction at Tg to (Tg + 60) ° C., and further to 180 to 230 ° C. as necessary. It can be obtained by performing heat treatment for 1 to 60 seconds and performing reheat treatment while shrinking 0 to 20% in the width direction at a temperature 10 to 20 ° C. lower than the heat treatment temperature.
[0017]
The thickness of the polyester film used in the present invention is preferably in the range of 25 to 300 μm. The upper limit of the film thickness is more preferably 250 μm, and the lower limit is more preferably 50 μm. When the film thickness is in the above range, the strength is preferable when the polyester film is used as a support for an antireflection film.
[0018]
(Coating layer)
The coating layer (easy-adhesive coating layer) in the present invention is required to have no defect that becomes an optical foreign material having a height difference of 0.5 μm or more and a maximum diameter of 0.5 μm or more. If the coating layer has defects in the coating layer that cause an optical foreign object with a height difference of 0.5 μm or more and a maximum diameter of 0.5 μm or more, interference fringes and missing images occur in images such as CRT, LCD, and PDP. The visibility and visibility of the image become worse. It is more preferable that the coating layer has no defect that becomes an optical foreign material having a height difference of 0.5 μm or more and a maximum diameter of 0.1 μm or more.
[0019]
In order to obtain such a coating layer, for example, it is preferable that the wettability of the coating agent is set to 40 mN / m or less so as to be surely wetted on the surface of the polyester film, thereby suppressing the occurrence of repellency. In order to suppress the occurrence of repellency due to foreign matter on the film surface, for example, in the manufacturing process, the cleanliness may be class 1500 or less, more preferably class 1000 or less. For example, class 1000 of cleanness means that there are no more than 1000 pieces of 0.5 μm dust in about 28.3 L. The coating layer of the composition listed below is selected for foreign matter due to coating aggregation and surface scratches (scratches, etc.) entering the coating layer in the manufacturing process and processing process. Those having the following are preferred.
[0020]
In addition, since the coating layer in this invention reduces the damage | wound etc. of the surface which enters into a coating layer in a manufacturing process or a processing process, the friction coefficient (microsecond) of the surface is 0.8 or less (thing which is excellent in slipperiness). Preferably there is.
[0021]
Furthermore, since it is used for display applications, it is necessary that the film substrate itself has little or no optical defects, and the haze of the film including the coating layer is preferably 1% or less.
[0022]
In the present invention, examples of the main component constituting the coating layer include polyester resins, acrylic resins, acrylic-modified polyester resins, polyurethane resins, polysiloxane resins, epoxy resins, polyether resins, vinyl resins, and the like. Among these, a polyester resin and an acrylic resin are preferable because of good adhesion, and a mixture of a polyester resin and an acrylic resin is more preferable.
[0023]
(Polyester resin)
Examples of the polyester resin used as a component of the coating layer include a polyester polymer or copolymer composed of a polybasic acid component and a polyol component as shown below. In addition, it is not limited to these monomers as a component of a polyester resin.
[0024]
The above polybasic acid components include terephthalic acid, isophthalic acid, phthalic acid, phthalic anhydride, 2,6-naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, adipic acid, sebacic acid, trimellitic acid, pyromellitic acid , Dimer acid, 5-sodium sulfoisophthalic acid and the like. It is preferable to use two or more of these acid components as a copolyester. Further, an unsaturated polybasic acid component such as maleic acid, itaconic acid and the like, and hydroxycarboxylic acid such as p-hydroxybenzoic acid, etc., can also be used in a slight amount.
[0025]
The polyol component includes ethylene glycol, 1,4-butanediol, diethylene glycol, dipropylene glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, xylene glycol, dimethylolpropane, and poly (ethylene oxide) glycol. And poly (tetramethylene oxide) glycol.
[0026]
(acrylic resin)
The acrylic resin used as a component of the coating layer in the present invention can be obtained by polymerizing, preferably copolymerizing, the acrylic monomers shown below. In addition, it is not limited to these monomers as a component of an acrylic resin.
[0027]
Examples of acrylic monomers include alkyl acrylates and alkyl methacrylates (alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, 2-ethylhexyl, and cyclohexyl groups. Hydroxy-containing monomers such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate and 2-hydroxypropyl methacrylate; epoxy group-containing monomers such as glycidyl acrylate, glycidyl methacrylate and allyl glycidyl ether; acrylic acid , Methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, styrene sulfonic acid and its salts (sodium salt, potassium salt, ammonium salt, tertiary amine salt, etc.) A monomer containing a carboxy group or a salt thereof; acrylamide, methacrylamide, N-alkyl acrylamide, N-alkyl methacrylamide, N, N-dialkyl acrylamide, N, N-dialkyl methacrylate (the alkyl group includes methyl group, ethyl Group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, cyclohexyl group, etc.), N-alkoxyacrylamide, N-alkoxymethacrylamide, N, N-dialkoxy Acrylamide, N, N-dialkoxymethacrylamide (alkoxy groups include methoxy, ethoxy, butoxy, isobutoxy, etc.), acryloylmorpholine, N-methylolacrylamide, N-methylolmethacrylamide, - it can be exemplified monomers containing phenyl acrylamide, an amido group such as N- phenyl methacrylamide.
[0028]
As copolymerization components, acid anhydride monomers such as maleic anhydride and itaconic anhydride; vinyl isocyanate, allyl isocyanate, styrene, α-methyl styrene, vinyl methyl ether, vinyl ethyl ether, vinyl trialkoxysilane, alkyl maleic acid Monomers such as monoesters, alkyl fumaric acid monoesters, alkyl itaconic acid monoesters, acrylonitrile, methacrylonitrile, vinylidene chloride, ethylene, propylene, vinyl chloride, vinyl acetate, and butadiene can be used.
[0029]
(Resin component in the coating layer)
It is preferable that 50 to 95% by weight of the polyester resin is contained in the coating layer. The upper limit of the proportion of the polyester resin in the coating layer is more preferably 90% by weight, and the lower limit is more preferably 60% by weight. Moreover, it is preferable that 5-30 weight% of acrylic resins are contained in an application layer. The upper limit of the proportion of the acrylic resin in the coating layer is more preferably 25% by weight, and the lower limit is more preferably 10% by weight. If the polyester resin exceeds 95% by weight or the acrylic resin is less than 5% by weight, the adhesion may be insufficient. If the acrylic resin exceeds 30% by weight, the acrylic resin may not be compatible with the polyester resin, resulting in poor transparency.
[0030]
In addition, the component which forms an application layer may be only a polyester resin and an acrylic resin, and other components other than a polyester resin and an acrylic resin may be mix | blended. For example, when 50% by weight of polyester resin and 30% by weight of acrylic resin are blended in the coating layer, 20% by weight of other components can be blended. Examples of other components include polyester resins, resins other than acrylic resins, polymers having an oxazoline group, crosslinkers such as melamine, epoxy, and aziridine, antistatic agents, colorants, surfactants, ultraviolet absorbers, lubricants ( Filler, wax).
[0031]
(wax)
In the present invention, the coating layer formed on the polyester film surface preferably further contains a wax. By containing the wax, it is possible to obtain a coating layer having better slipperiness.
[0032]
Specific examples of this wax include plant waxes such as carnauba wax, candelilla wax, rice wax, wood wax, jojoba oil, palm wax, rosin-modified wax, aucuric wax, sugar cane wax, esparto wax, bark wax, Animal waxes such as beeswax, lanolin, whale wax, ibota wax, shellac wax, mineral waxes such as montan wax, ozokerite, ceresin wax, petroleum waxes such as paraffin wax, microcrystalline wax, petrolactam, fishertro push wax, Examples thereof include synthetic hydrocarbon waxes such as polyethylene wax, oxidized polyethylene wax, polypropylene wax, oxidized polypropylene wax, and the like. Among these, carnauba wax, paraffin wax, and polyethylene wax are more preferable because they are easy to adhere to hard coats and pressure-sensitive adhesives and have good lubricity. Furthermore, an aqueous dispersion is more preferable from an environmental problem and the ease of handling.
[0033]
The wax is preferably contained in the coating layer in the range of 0.5 to 20% by weight, and more preferably in the range of 1 to 10% by weight. If the ratio of the wax is less than 0.5% by weight, the slipperiness of the film surface may not be obtained. On the other hand, if it exceeds 20% by weight, adhesion to the polyester substrate and easy adhesion to a hard coat or pressure-sensitive adhesive may be insufficient.
[0034]
(Filler)
In the present invention, the composition constituting the coating layer formed on the surface of the polyester film preferably further contains a filler. By containing a filler, it is possible to obtain a coating layer having better slipperiness.
[0035]
Specific examples of the filler include calcium carbonate, magnesium carbonate, calcium oxide, zinc oxide, magnesium oxide, silicon oxide, sodium silicate, aluminum hydroxide, iron oxide, zirconium oxide, barium sulfate, titanium oxide, tin oxide, three Illustrate inorganic fine particles such as antimony oxide, carbon black, molybdenum disulfide, organic fine particles such as acrylic cross-linked polymers, styrene cross-linked polymers, cross-linked silicone resins, fluororesins, benzoguanamine resins, phenol resins, nylon resins, etc. Can do.
[0036]
If these fillers are too large, they will fall out of the coating layer, so the average particle size is preferably 0.15 μm or less, and if they are too small, the slipperiness due to the filler will not be exhibited, so the average particle size is 0. It is preferably in the range of 0.01 to 0.1 μm. Among these, it is preferable to select a filler whose specific gravity does not exceed 3 in order to avoid sedimentation of the water-insoluble solid substance in the aqueous dispersion.
[0037]
This filler should just be contained 5 to 30weight% in the composition which forms a coating film. In particular, when a relatively large filler having an average particle size of 0.1 μm or more is used, the range is 5 to 10% by weight. When a filler having an average particle size of 0.01 to 0.1 μm is used, the range is 8 to 30% by weight. It is preferable to select from among them.
[0038]
(Coating solution)
In the present invention, the coating liquid used for forming the coating layer is preferably used in the form of an aqueous coating liquid such as an aqueous solution, an aqueous dispersion or an emulsion. For the coating liquid, if necessary, other resins than the above composition, for example, a polymer having an oxazoline group, a crosslinking agent such as melamine, epoxy, aziridine, an antistatic agent, a coloring agent, a surfactant, an ultraviolet absorber An agent, a lubricant (filler), etc. can be added. By adding a lubricant, the slipperiness and blocking resistance of the laminated film can be further improved.
[0039]
The solid content concentration of the aqueous coating liquid is usually 20% by weight or less, and more preferably 1 to 10% by weight. If this ratio is less than 1% by weight, the coatability to the polyester film may be insufficient, while if it exceeds 20% by weight, the stability of the coating and the appearance of the coating may be deteriorated.
[0040]
(Application of coating liquid)
Application of the aqueous coating liquid to the polyester film can be carried out at any stage, but it is preferably carried out during the production process of the polyester film, and moreover, it is applied to the polyester film before orientation crystallization is completed. Is preferred.
[0041]
Here, the polyester film before the crystal orientation is completed is an unstretched film, a uniaxially stretched film obtained by stretching the unstretched film in either the longitudinal direction or the transverse direction, and low in the biaxial direction of the longitudinal direction and the transverse direction. A biaxially stretched film that can be further stretched at a magnification (a biaxially stretched film before being finally restretched in the machine direction or the transverse direction to complete orientation crystallization).
[0042]
In particular, it is preferable to apply the aqueous coating liquid of the above composition to an unstretched film or a uniaxially stretched film oriented in one direction, and perform longitudinal stretching and / or lateral stretching and heat setting as it is.
[0043]
When applying an aqueous coating liquid to a film, as a pretreatment for improving the coating property, the film surface is subjected to physical treatment such as corona surface treatment, flame treatment, plasma treatment, etc., or chemically combined with the composition. It is preferable to use an inert surfactant in combination.
[0044]
Such a surfactant promotes the wettability of the aqueous coating liquid to the polyester film. For example, polyoxyethylene alkylphenyl ether, polyoxyethylene-fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester, fatty acid metal soap, Examples include anionic and nonionic surfactants such as alkyl sulfates, alkyl sulfonates, and alkyl sulfosuccinates. The surfactant is preferably contained in an amount of 1 to 10% by weight in the composition forming the coating film. If it is this range, it can be set to 40 mN / m or less, and it is possible to prevent the coating layer from repelling.
[0045]
The coating amount of the coating liquid is preferably such that the thickness of the coating film is in the range of 0.02 to 0.3 μm, preferably 0.07 to 0.25 μm. If the thickness of the coating film is too thin, the adhesive strength may be insufficient. Conversely, if it is too thick, blocking may occur or the haze value may increase.
[0046]
As the coating method, any known coating method can be applied. For example, a roll coating method, a gravure coating method, a roll brush method, a spray coating method, an air knife coating method, an impregnation method, a curtain coating method and the like can be used alone or in combination. In addition, a coating film may be formed only in the single side | surface of a film as needed, and may be formed in both surfaces.
[0047]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. In the examples and comparative examples, the defects, haze value, coefficient of friction (μs), and adhesion of the coating layer were evaluated by the following methods.
[0048]
(1) Disadvantages of coating layer
・ Size measurement
1m area ² The coating layer was visually observed for the presence or absence of defects in the coating layer such as repellency, foreign matter, scratches, etc., and if there were, the defects in the coating layer were measured with a laser optical microscope (VF-750) manufactured by Keyence Corporation. Measure the thickness. The number of defects of the coating layer having a height difference of 0.5 μm or more and a maximum diameter of 0.1 μm or more is obtained.
A: No defects in coating layer with height difference of 0.5 μm or more and maximum diameter of 0.1 μm or more ...... Extremely good
○: No defects in coating layer with height difference of 0.5 μm or more and maximum diameter of 0.5 μm or more …… Good
×: Defect present in coating layer with height difference of 0.5 μm or more and maximum diameter of 0.5 μm or more ...... Poor
[0049]
・ Image clarity and visibility
The film is pasted on a CRT (RDF19S) manufactured by Mitsubishi Electric Corporation, and the occurrence of interference fringes and optical defects is visually observed.
A: No interference fringes and no optical defects.
○: Interference fringes and optical defects are slightly confirmed, but the image is not affected.
×: Interference fringes and optical defects were confirmed, affecting the sharpness and visibility of images.
[0050]
(2) Haze value
The haze value of the film was measured using a haze measuring device (NDH-20) manufactured by Nippon Denshoku Industries Co., Ltd. The haze of the film was evaluated according to the following criteria.
A: Haze value ≦ 0.5% …… Haze of film is extremely good
○: 0.5% <haze value ≦ 1.0% …… Good film haze
×: 1.0% <haze value …… Haze defect of film
[0051]
(3) Friction coefficient (μs)
In accordance with ASTM D1894-63, a slippery measuring device manufactured by Toyo Tester was used to measure the static friction coefficient (μs) between the coating film forming surface and the polyethylene terephthalate film (coating film non-forming surface). However, the thread plate was a glass plate and the load was 1 kg. The slipping property of the film was evaluated according to the following criteria.
◎: Friction coefficient (μs) ≦ 0.5 …… Excellent sliding property
○: 0.5 <coefficient of friction (μs) ≦ 0.8 …… Good sliding property
×: 0.8 <Friction coefficient (μs) …… Slippery failure
[0052]
(4) Adhesiveness
・ Hard coat
A 10 μm thick hard coat layer is formed on the coating-forming surface of the easy-adhesive laminated film, and a cross cut (100 squares of 1 mm 2) is applied, and then a 24 mm wide cellophane tape (Nichiban) Manufactured) and abruptly peeled off at a peeling angle of 180 °, and then the peeled surface was observed and evaluated according to the following criteria.
5: Peeling area is less than 10%.
4: The peeled area is 10% or more and less than 20%.
3: The peeled area is 20% or more and less than 30%.
2: The peeled area is 30% or more and less than 40%.
1: The peeled area exceeds 40%.
[0053]
・ Adhesive (PSA)
A pressure-sensitive adhesive (PSA) layer having a thickness of 20 μm was formed on the coating film-forming surface of the easy-adhesive laminated film, and the pressure-sensitive adhesive layer surface was affixed to the float glass. Peeling was performed at a peeling angle of °, and the residual state of the pressure-sensitive adhesive (PSA) was observed on the glass surface and evaluated according to the following criteria.
5: Adhesive (PSA) residual area is less than 10%.
4: Adhesive (PSA) residual area is 10% or more and less than 20%.
3: Adhesive (PSA) residual area is 20% or more and less than 30%.
2: Adhesive (PSA) residual area is 30% or more and less than 40%.
1: Adhesive (PSA) residual area is over 40%.
[0054]
(5) Comprehensive evaluation
Based on the evaluation results of defects of the coating layer (size measurement / image clarity visibility), haze, coefficient of friction, and adhesion (hard coat / adhesive), the following criteria were used for evaluation.
A: Most of the characteristics are very good and there are no bad ones. Overall evaluation is very good.
×: Some of each characteristic is defective …… Overall evaluation is poor
[0055]
[Examples 1 to 3 and Comparative Example 1]
After extruding molten polyethylene terephthalate (inherent viscosity: 0.64 dl / g, glass transition point 78 ° C.) from a die, cooling with a cooling drum by a conventional method to form an unstretched film, and then stretching it 3.6 times in the machine direction Then, an aqueous coating solution having a solid content concentration of the following coating film composition (Table 1) of 8% was uniformly applied to both surfaces with a roll coater.
[0056]
[Table 1]

[0057]
In Table 1, each component in the coating layer represents the following polymer or compound.
Polyester: Polyester copolymer having an acid component of 90 mol% terephthalic acid / 4 mol% isophthalic acid / 5 mol of 5-sodium sulfoisophthalic acid and a glycol component of 90 mol% ethylene glycol / 10 mol% diethylene glycol (Tg = 70 ° C. ).
Acrylic: Acrylic copolymer (Tg = 40 ° C.) containing 50 mol% methyl methacrylate / 40 mol% ethyl acrylate / 5 mol% N-methylolacrylamide / 2 mol% 2-hydroxyethyl methacrylate.
Wax: Carnauba wax
Filler: Silica filler (average diameter: 0.1 μm)
Wetting agent: polyoxyethylene (n = 7) lauryl ether
[0058]
Subsequently, this coated film was subsequently dried at 95 ° C., stretched 3.8 times in the transverse direction at 120 ° C., and heat-fixed by shrinking 3% in the width direction at 220 ° C. to obtain a laminated film having a thickness of 188 μm. It was. The evaluation results of the obtained laminated film are shown in Table 2. The thickness of the coating film was 0.15 μm. The laminated film was prepared in an environment with a cleanness of class 1000.
[0059]
[Example 4]
Molten polyethylene-2,6-naphthalate (inherent viscosity: 0.60 dl / g, glass transition point: 121 ° C.) is extruded from a die, cooled by a cooling drum by a conventional method to form an unstretched film, and then 3. After stretching 6 times, an aqueous coating liquid having a solid content concentration of 8% on the both sides of the coating film composition (coating liquid 1 in Table 1) was uniformly applied with a roll coater. Subsequently, this coated film was subsequently dried at 105 ° C., stretched 3.8 times at 140 ° C. in the transverse direction, and heat-set by shrinking 3% in the width direction at 230 ° C. to obtain a laminated film having a thickness of 188 μm. It was. The evaluation results of the obtained laminated film are shown in Table 2. The thickness of the coating film was 0.15 μm. The laminated film was created in an environment with a cleanness of class 1000.
[0060]
[Comparative Example 2]
A laminated film was produced in the same manner as in Example 3 except that the laminated film was produced in an environment having a cleanness of class 3000. The evaluation results of the obtained laminated film are shown in Table 2.
[0061]
[Comparative Example 3]
All were carried out in the same manner as in Example 1 except that the coating layer was not provided. The evaluation results of the obtained film are shown in Table 2.
[0062]
[Table 2]

[0063]
As is apparent from the results shown in Table 2, the anti-adhesive laminated film for antireflection of the present invention was excellent in image sharpness, transparency, slipperiness, adhesion to the hard coat layer and the pressure-sensitive adhesive layer. It was.
[0064]
【The invention's effect】
The anti-adhesive laminated film for antireflection of the present invention has no defects that become an optical foreign substance in the coating layer, and has excellent adhesiveness, transparency, and slipperiness, such as CRT, LCD, organic EL, PDP, etc. Useful for antireflection films used in displays.

Claims (5)

A laminated film in which a coating layer is formed on at least one side of a polyester film, and the coating layer has no drawback that it becomes an optical foreign material having a height difference of 0.5 μm or more and a maximum diameter of 0.5 μm or more. Easy-adhesive laminated film for antireflection. The easily adhesive laminated film for antireflection according to claim 1, wherein the coating layer contains a polyester resin and an acrylic resin. The easily adhesive laminated film for antireflection according to claim 1 or 2, wherein the coating layer contains a wax. The easy-adhesion laminated film for antireflection according to any one of claims 1 to 3, wherein a filler is contained in the coating layer. The easily adhesive laminated film for antireflection according to any one of claims 1 to 4, wherein the polyester film is mainly composed of polyethylene terephthalate and / or polyethylene-2,6-naphthalate.