JP2014195966A - Laminated coating film and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated coating film for preventing the generation of "blocking" generated by the close adhesion of the surface and the rear surface of overlapped films and "winding deviation", that is, the deviation of winding position of the film during winding-up by a simple countermeasure, in the production of a laminated coating film by a roll-to-roll system, and to provide a method for producing the same.SOLUTION: The laminated coating film is a functional film obtained by laminating a plurality of layers on one surface or both surfaces of a base material and characterized in that the coating width of any layer other than the outermost layer is wider by 3 mm or more than the coating width of the outermost layer.

Description

  The present invention relates to a functional film obtained by laminating a plurality of layers on a film substrate and a method for producing the same, and more particularly to a roll-to-roll laminated coating film and a method for producing the same.

  Functional films obtained by coating a base film such as energy (various batteries, etc.), household goods (packaging materials, etc.) and displays are used in many fields and applications. There are a wide variety of functions required for functional films with such coatings, and in response to the demand for higher functionality and functional integration, a functional film that meets all requirements can be produced with only one coating layer. This is difficult, and generally, a functional film having a plurality of functions is created by laminating layers having respective functions.

  There are various uses for these functional films, but one side is often used for the purpose of being bonded to any member, and the other side is often used for the purpose of being exposed to air (so-called outside). As for the surface directed to the outside, although there are different requirements in the usage environment, it is generally necessary to withstand external stimuli, and for example, a function to prevent scratches or prevent dirt is required.

  In order to prevent scratches and dirt on the functional film surface, organic or inorganic materials incorporating silicone or fluorine as a functional group are commonly used as the constituent material of the outermost coating layer. Silicone and fluorine increase the contact angle of pure water on the surface of the coating layer to prevent the adhesion of dirt, and have the function of simplifying the removal of the adhered dirt, and further segregate on the surface to give slipperiness. The effect which prevents a damage can be taken out.

  For example, in the case of a display, regardless of a liquid crystal display, a plasma display, or an organic EL display, the screen size has been increased and the definition has been increased. Accordingly, there is an increasing demand for antireflection treatment for improving visibility, and an optical film provided with an antireflection layer is bonded to the front surface of the display. In the case of such a display, a hard coat layer is first formed on a transparent substrate because it is easy to be scratched by direct hand touching or touching objects, and the mechanical strength of the film substrate itself is often weak. Then, an antireflection film in which an antireflection layer containing silicone or a fluorine material for imparting antifouling properties and scratch resistance is formed is widely used.

  On the other hand, in the production of these functional films, a roll-to-roll system advantageous for mass productivity and cost reduction is actively used. In the roll-to-roll method, since the base material and the product are rolls of about several thousand meters, not only the technology relating to the coating but also the technology for winding up the product without any defects is very important.

  When rolling up a product in roll form, the front and back surfaces of the overlapping films are in close contact with each other, causing “blocking” that causes deformation of the film itself, and the winding position of the film is shifted during winding (or the same) There are two points: “winding misalignment”. It has been empirically found that the situation changes due to various factors such as the type of film used, the structure and settings of the machine, the production speed, etc. The tendency is to loosen the winding tension and film It has been found that “blocking” due to sticking can be prevented, and “winding deviation” can be prevented by increasing the winding tension. Therefore, the two "blocking" and "winding misalignment" are in a trade-off relationship, and various ideas have been studied to achieve both of them. For example, embossing called knurl is applied to both ends of the substrate, Measures such as adding fine particles as a blocking-resistant agent to the coating material, forming a fine particle-added layer, or applying a band-shaped countermeasure layer to the edge of the substrate are known.

  However, when the functional coating as described above is performed, a layer with extremely high slip properties such as silicone and fluorine is formed on the outermost surface, so that the surface of the coating layer and the substrate surface slide during winding. As a result, the winding misalignment tends to be significantly worsened, and conventional measures may not provide sufficient effects. In addition, there are configurations that do not allow coating of nals on the base material or application of anti-blocking agents, and in order to avoid cost increases due to additional processing, it is easy to stack the necessary coating layers. Measures that can improve blocking or winding deviation are needed.

Japanese Patent No. 4479260 Japanese Patent Laid-Open No. 2002- 211803 JP 2009-229501 A JP 2011-39089 A JP2011-218618A JP 2012-206502 A

  Accordingly, the present invention provides a multilayer coating film that does not cause these defects by simply implementing a countermeasure against blocking or winding deviation at the coating layer forming stage, and also provides a method for producing the same.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a functional film obtained by laminating a plurality of layers on one side or both sides of a substrate, and is not any outermost surface. The functional film is characterized in that the coating width of the layer is 3 mm or more wider than the coating width of the outermost layer.

  In the invention according to claim 2, both end portions of the outermost surface layer are laminated at a position where they do not protrude from both end portions of the layer having a wider application width of 3 mm or more than the outermost surface layer. 2. The functional film according to claim 1, wherein

  The invention according to claim 3 is the laminated coating film according to claim 1 or 2, wherein the outermost surface layer contains a slipping agent or additive having silicone or a fluorine functional group.

  According to a fourth aspect of the present invention, there is provided the multilayer coating film according to any one of the first to third aspects, wherein a thickness of the outermost surface layer is 1 μm or less.

  Moreover, as invention of Claim 5, in the manufacturing method of the functional film obtained by laminating | stacking several layers on the single side | surface or both surfaces on a base material, the coating liquid (A) was apply | coated on the base material. Thereafter, the step of drying the coating solution (A), further curing the dried coating solution, and the coating solution having a composition different from that of the coating solution (A) on the coating solution (A) after the step. (B) is applied, and then the coating liquid (B) is dried and further cured by irradiating with ultraviolet rays, and the coating liquid (B) is applied to the coating liquid (A). It is the manufacturing method of the lamination | stacking coating film characterized by being laminated | stacked in the position which does not protrude from the both ends of an application part, or inside.

  Moreover, as invention of Claim 6, in the manufacturing method of the multilayer coating film of Claim 5, the application width | variety of the application part of the said coating liquid (A) is application | coating of the application part of the said coating liquid (B). A method for producing a laminated coating film characterized by being 3 mm or more wider than the width.

  In addition, as a seventh aspect of the present invention, in the method for producing a laminated coating film according to any of the fifth to sixth aspects, the coating liquid (B) includes a slipping agent or an additive having silicone or a fluorine functional group. Is a method for producing a laminated coating film.

  The invention according to claim 8 is characterized in that, in the method for producing a laminated coating film according to claims 5 to 7, the thickness of the coating liquid (B) after curing is 1 μm or less. It is a manufacturing method of a laminated coating film.

  By suppressing the movement in the width direction of the film in which the end portions of the layers other than the outermost surface that protrude from the outermost surface layer overlap in a roll shape according to the present invention, it is possible to greatly improve the winding misalignment resistance. it can. As a result, the winding tension can be lowered, and as a result, the blocking can be improved. As described above, the present invention provides a functional film in which a plurality of layers are laminated on a film base material, and a laminated coating film in which the occurrence of problems such as blocking and winding misalignment in a product roll is prevented, and no problem occurs. A method for producing a stable laminated coating film could be proposed.

FIG. 1 is a schematic cross-sectional view of an example of the laminated coating film of the present invention. FIG. 2 is a schematic cross-sectional view of a laminated example different from FIG. FIG. 3 is a schematic cross-sectional view of an antireflection film which is one embodiment of the present invention.

  The laminated coating film of the present invention and the production method thereof will be described. The cross-sectional schematic diagram of the laminated coating film of this invention was shown in FIG. In the laminated coating film 1 of FIG. 1, a layer 11 other than the outermost surface and an outermost surface layer 10 are laminated on a substrate 12. If it is this structure, it is the characteristics of this invention that the application | coating width | variety of the layer 11 which is not the outermost surface is 3 mm or more wider than the outermost surface layer 10. FIG. Note that the coating width of the layer 11 that is not the outermost surface layer is 3 mm or more wider than the outermost surface layer 10 is that the outermost surface layer 10 as shown in FIG. 2, and the outermost surface layer 10 is not the outermost coated layer as shown in FIG. 2. The case where it has approached to one side of layers 11 other than a surface layer is also included, and the case where it has an unapplied area | region which is 3 mm or more wide on the other side is included. In addition, in FIG. 1, a two-layer laminated coating film is simply shown, but more layers may be laminated between the base material 12 and the outermost surface layer 10, and the layers other than the outermost surface layer 10 may be laminated. Any one of the layers may have a coating width that is 3 mm or more wider than the outermost surface layer 10.

Although this invention does not prescribe | regulate about the presence or absence of the nal of the base material 12, nals exist in both ends of the base material, and a layer other than the outermost surface layer 3 mm or more wider than the outermost surface layer overlaps part or all of the nal. When the layers are laminated as described above, the effects of the present invention can be further enhanced.

  The coating material used in the present invention is not particularly defined, but known resins such as a thermosetting resin having a siloxane structure and an ionizing radiation curable resin using UV or EB can be used. Furthermore, it is possible to mix known fine particles, conductive agents and additives in order to impart functionality to these resins, and in order to improve the adhesion between layers, corona treatment, plasma treatment, alkali treatment, etc. It is also possible to carry out the surface treatment on the substrate and each layer.

  Further, in order to explain the present invention in detail, an antireflection film will be described as an example.

[About transparent substrate]
As the transparent substrate used for the optical film including the antireflection film, films or sheets made of various organic polymers can be generally used. A sufficiently thin glass film that can be wound into a roll can also be used. In consideration of optical properties such as transparency and refractive index, as well as various physical properties such as impact resistance, heat resistance, durability, etc., for films or sheets made of organic polymers, polyolefins such as polyethylene and polypropylene are used. Polyesters such as polyethylene terephthalate and polyethylene naphthalate, celluloses such as triacetylcellulose, diacetylcellulose and cellophane, polyamides such as 6-nylon and 6,6-nylon, acrylics such as polymethylmethacrylate, and polystyrene Polycarbonate, polyimide, polyvinyl alcohol, etc. are used. In particular, polyethylene terephthalate, triacetyl cellulose, polycarbonate, and polymethyl methacrylate are preferably used from the viewpoint of optical properties. Furthermore, in forming these organic polymers into films, various known additives such as ultraviolet absorbers, infrared absorbers, plasticizers, antistatic agents, colorants, antioxidants, flame retardants and the like can be added. Functions can be added. Further, the transparent substrate may be composed of one kind or a mixture of two or more kinds selected from the above organic polymers, a polymer, or may be composed of a plurality of layers. The thickness of these transparent substrates is preferably 5 μm or more and 200 μm or less, and more preferably 20 μm or more and 100 μm or less.

  The antireflection film can be obtained by forming an antireflection layer on a transparent substrate. The antireflection layer needs to be formed on the outermost surface in principle, but any number of other functional layers can be provided between the transparent substrate and the antireflection layer. Since the above-mentioned transparent substrate alone has a problem of low mechanical strength such as pencil hardness, a hard coat layer generally made of an ionizing radiation curable resin is often formed on the transparent substrate. In order to further improve the antireflection function, layers having different refractive indexes may be overlapped to form an antireflection laminate.

[About hard coat layer and coating liquid (A)]
The coating liquid and coating liquid (A) that form the hard coat layer are described below.

  Examples of the ionizing radiation curable resin used for the hard coat layer include polyester acrylate-based, epoxy acrylate-based, urethane acrylate-based, polyol acrylate-based prepolymers, and the like. These ionizing radiation curable resins may be used alone or in combination of two or more.

  Examples of the photopolymerizable monomer used as the ionizing radiation curable resin include trimethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol (meth) acrylate, and pentaerythritol tris. (Meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and the like. Further, a (meth) acryl monomer or a polymer thereof can be added for the purpose of improving the surface hardness.

As the (meth) acrylic monomer, in addition to the above monomers, for example, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, butanediol di (meth) acrylate, hexanediol di (meth) acrylate, nonanediol di ( (Meth) acrylate, ethoxylated hexanediol di (meth) acrylate, propoxylated hexanediol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, ethoxylated neopentyl glycol di (meth) acrylate Di (meth) acrylates such as tripropylene glycol di (meth) acrylate and hydroxypivalate neopentyl glycol di (meth) acrylate, Tri (meth) acrylate such as trimethylolpropane tri (meth) acrylate, propoxylated trimethylolpropane tri (meth) acrylate, tris 2-hydroxyethyl isocyanurate tri (meth) acrylate, glycerol tri (meth) acrylate, dipenta Trifunctional (meth) acrylate compounds such as erythritol tri (meth) acrylate and ditrimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra (meth) ) Acrylate, dipentaerythritol penta (meth) acrylate, ditrimethylolpropane penta (meth) acrylate, ditrimethylolpropane hexa ( Motor) trifunctional or higher polyfunctional (meth) acrylate compound or the like acrylate, and these (meth) polyfunctional (meth) acrylate compound a part of the acrylate was substituted with an alkyl group and ε- caprolactone.

  In addition, a photopolymerization initiator is added to the hard coat material made of the ionizing radiation curable resin as necessary. Examples of the photopolymerization initiator include acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, thioxanthones, and the like, and these can be used alone or in combination.

  Furthermore, in order to impart an antistatic function to the antireflection film, a conductive agent can be added to the hard coat layer. The conductive agent is not particularly limited, and a quaternary ammonium salt having an ion conduction mechanism, metal oxide fine particles having an electron conduction mechanism, a π-conjugated conductive polymer, and the like can be used.

  In the embodiment of the present invention, “(meth) acrylic monomer” indicates both “acrylic monomer” and “methacrylic monomer”.

  When forming a hard coat layer made of these ionizing radiation curable resins, a coating solution diluted with a solvent is used as necessary. By using a solvent, it is possible to adjust the viscosity and the surface tension, and to improve the coating suitability. Solvents include aromatic hydrocarbons such as toluene, xylene, cyclohexane and cyclohexylbenzene, hydrocarbons such as n-hexane, dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, dioxane, dioxolane, and trioxane. , Ethers such as tetrahydrofuran, anisole and phenetole, as well as ketones such as methyl isobutyl ketone, methyl butyl ketone, acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone and methylcyclohexanone, and formic acid Ethyl, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate, and γ- Coating from esters such as tyrolactone, cellosolves such as methyl cellosolve, ethyl cellosolve, butyl cellosolve, cellosolve acetate, alcohols such as methanol, ethanol, n-propyl alcohol, isopropyl alcohol, ethylene glycol, water, etc. It is appropriately selected in consideration of appropriateness.

[Antireflection layer and coating liquid (B)]
The coating liquid and coating liquid (B) that form the antireflection layer are described below.

The antireflection material for forming the antireflection layer is generally prepared from low refractive index particles and a binder matrix forming material. Low refractive index particles such as LiF, MgF, 3NaF · AlF or AlF (all with a refractive index of 1.4), or Na ₃ AlF ₆ (cryolite, with a refractive index of 1.33) However, in order to obtain better antireflection performance (low reflectance), particles having voids inside the particles can be suitably used. In the case of particles having voids inside the particles, the voids can be made to have a refractive index of air (≈1), and therefore, low refractive index particles having a very low refractive index can be obtained. Specifically, porous silica particles and low refractive index silica particles having voids inside can be used.

As the binder matrix forming material, a hydrolyzate of silicon alkoxide can be used. Furthermore, the silicon alkoxide represented by the general formula (1), R _x Si (OR) _4-x (wherein R represents an alkyl group and x is an integer satisfying 0 ≦ x ≦ 3). Hydrolyzate can be used.

  Examples of the silicon alkoxide represented by the general formula (1) include tetramethoxysilane, tetraethoxysilane, tetra-iso-propoxysilane, tetra-n-propoxysilane, tetra-n-butoxysilane, and tetra-sec-butoxy. Silane, tetra-tert-butoxysilane, tetrapentaethoxysilane, tetrapenta-iso-propoxysilane, tetrapenta-n-proxysilane, tetrapenta-n-butoxysilane, tetrapenta-sec-butoxysilane, tetrapenta-tert-butoxysilane, methyl Trimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, methyltributoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, dimethylethoxysilane, dimethylmethan Kishishiran, dimethyl propoxysilane, dimethyl-butoxy silane, can be used methyl dimethoxysilane, methyl diethoxy silane, hexyl trimethoxy silane. The hydrolyzate of silicon alkoxide may be obtained by using a metal alkoxide represented by the general formula (1) as a raw material. For example, it can be obtained by hydrolysis with hydrochloric acid.

Furthermore, as the binder matrix forming material of the antireflection layer, the silicon alkoxide represented by the general formula (1) may be replaced with the general formula (2), R ′ _z Si (OR) _4-z (where R ′ Represents a non-reactive functional group having an alkyl group, a fluoroalkyl group or a fluoroalkylene oxide group, and z is an integer satisfying 1 ≦ z ≦ 3). As a result, antifouling property can be imparted to the surface of the antireflection layer, and the refractive index of the antireflection layer can be further reduced to reduce the reflectance.

  Examples of the silicon alkoxide represented by the general formula (2) include octadecyltrimethoxysilane, 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane, and the like.

  An ionizing radiation curable resin can also be used as the binder matrix forming material. As the ionizing radiation curable resin, the photopolymerizable polymer and the photopolymerizable monomer exemplified as the hard coat material can be used, and polyfunctional acrylates such as polyfunctional urethane acrylate can be used. In addition to these, polyether resins, polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins having an acrylate functional group can be used as ionizing radiation type resins. .

In addition, a solvent and various additives can be added to the coating liquid for forming the antireflection layer as necessary. Solvents include aromatic hydrocarbons such as toluene, xylene, cyclohexane and cyclohexylbenzene, hydrocarbons such as n-hexane, dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, dioxane, dioxolane, and trioxane. , Ethers such as tetrahydrofuran, anisole and phenetole, and ketones such as methyl isobutyl ketone, methyl butyl ketone, acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, and methylcyclohexanone , Ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, Suitable for coating from esters such as acid n-pentyl and γ-butyrolactone, cellosolves such as methyl cellosolve, cellosolve, butyl cellosolve, cellosolve acetate, alcohols such as methanol, ethanol, isopropyl alcohol, water, etc. Etc. are selected as appropriate. Moreover, a surface adjusting agent, a leveling agent, a refractive index adjusting agent, an adhesion improver, a photosensitizer, etc. can be added to the coating liquid as additives.

  In addition, when an ionizing radiation curable resin is used as a binder matrix forming material and an antireflection layer is formed by irradiating ultraviolet rays, a photopolymerization initiator is added to the coating liquid. Examples of the photopolymerization initiator include acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, thioxanthones, and the like.

  When forming the hard coat layer or the antireflection layer, a wet film forming method can be used. As the wet film forming method, a coating method using a roll coater, a reverse roll coater, a gravure coater, a micro gravure coater, a knife coater, a bar coater, a wire bar coater, a die coater, or a dip coater can be used. The wet film forming method is often used because the processing speed is relatively high, but in the present invention, a dry film forming method such as vapor deposition or sputtering may be used. Further, it is possible to combine a wet film formation method and a dry film formation method in the process of lamination.

  Examples are shown below.

[Hardcoat layer forming coating solution and coating solution (A)]
The following materials were mixed to obtain a hard coat layer forming coating solution.
・ 100 parts by weight of urethane acrylate (manufactured by Kyoeisha Chemical Co., UA-306H)
Dipentaerythritol hexaacrylate 50 parts by weight Pentaerythritol triacrylate 50 parts by weight Photopolymerization initiator 10 parts by weight (manufactured by Ciba Japan, Irgacure 184)
・ Methyl ethyl ketone 100 parts by weight ・ Methyl acetate 100 parts by weight

[Coating liquid and coating liquid for forming antireflection layer (B)]
The following materials were mixed to obtain a coating solution for forming the antireflection layer.
-Porous silica fine particle dispersion 15 parts by weight (average particle size 50 nm, solid content 20%, methyl isobutyl ketone dispersion)
・ EO modified dipentaerythritol hexaacrylate 2 parts by weight (manufactured by Nippon Kayaku Co., Ltd., DPHA-12)
Photopolymerization initiator 0.1 part by weight (Ciba Japan, Irgacure 184)
-Perfluoroalkyl group, hydrophilic group, lipophilic group-containing oligomer (manufactured by DIC, Megafac F-470) 0.1 parts by weight-Methyl isobutyl ketone 82 parts by weight

Example 1
A polyester film (Toyobo Co., Ltd., Cosmo Shine A4100, thickness 100 μm, substrate width 1340 mm) is used as the transparent substrate, and the thickness after drying is 5 μm using the coating liquid for forming the hard coat layer. Was formed with a micro gravure coater so as to be 1320 mm, dried at 60 ° C., and then cured using an ultraviolet irradiation device.

  Next, using the coating liquid for forming the antireflection layer, it was coated and formed with a microgravure coater so that the thickness after drying was 0.1 μm and the coating width was 1317 mm, and dried at 60 ° C. Then, it was cured using an ultraviolet irradiation device to produce an antireflection film. Detailed conditions and set values are shown in Table 1.

(Example 2)
As a transparent substrate, a triacetyl cellulose film (thickness 80 μm, substrate width 1330 mm) formed with naals in a range of 5 mm to 15 mm from both ends is used. Was made.

(Comparative Example 1)
An antireflection film was produced in the same manner as in Example 1 except that the coating width of the antireflection layer was 1322 mm and the hard coat layer was completely covered.

(Comparative Example 2)
An antireflection film was produced in the same manner as in Example 2 except that the coating width of the antireflection layer was 1322 mm and the hard coat layer was completely covered.

(Comparative Example 3)
An antireflection film was produced in the same manner as in Comparative Example 1 except that the mechanical conditions shown in Table 1 were changed.

(Comparative Example 4)
An antireflection film was produced in the same manner as in Comparative Example 2 except that the mechanical conditions shown in Table 1 were changed.

<Evaluation and evaluation method>
The antireflection films obtained in Examples 1 and 2 and Comparative Examples 1 to 4 were evaluated for blocking and winding deviation by the following methods. In the evaluation, the antireflection films of Examples 1 and 2 and Comparative Examples 1 to 4 were wound on a 6 inch core by 1000 m and evaluated.

"blocking"
The roll surface of the antireflection film wound up 1000 m was observed, and deformation due to blocking was evaluated. Next, after the 900 m antireflection film was unwound from the outside of the winding, deformation due to blocking of the winding core 100 m portion was evaluated. Each evaluation standard was as follows.
A: Deformation is not observed at all O: Slight deformation is observed, but there is no practical problem.
×: Deformation that can cause problems

"Winding misalignment"
The roll edge of the antireflection film taken up by 1000 m was observed, and the maximum value of the left and right deviations from the winding start part to the unwinding was measured. Moreover, it evaluated according to the following references | standards from the measured value.
◎: Winding deviation of 2 mm or less ○: Winding deviation of 2 mm to 5 mm ×: Winding deviation of 5 mm or more

  As shown in Table 1, the hard coat layer portion that protrudes from the antireflection layer moves left and right by applying a hard coat layer 3 mm wider than the antireflection layer that is the outermost surface layer as in the present invention. It can be seen that the resistance to winding deviation is improved. Furthermore, as shown in Example 2, when a base material having a knurl is used, it is possible to lower the winding tension because resistance to winding deviation is further improved, and as a result, the blocking evaluation result is good. It has become a thing. Further, in Comparative Examples 1 and 2, winding misalignment occurs, but Comparative Examples 3 and 4 are obtained by increasing the winding tension to suppress the winding misalignment with the coating width as it is. In Comparative Examples 3 and 4, although the winding deviation was improved, blocking was generated by raising the winding tension, and it was impossible to find a condition for achieving both winding deviation and blocking.

  From the above results, it was possible to easily produce a good roll that achieved both winding displacement and blocking without using a blocking agent or a blocking layer for winding defects such as winding displacement and blocking.

DESCRIPTION OF SYMBOLS 1 ... Laminated coating film 10 ... Outermost surface layer 11 ... Layer 12 other than outermost surface ... Base material 2 ... Antireflection film 20 ... Antireflection layer 21 ... Hard coat layer 22 ... Transparent base material

Claims (8)

  A functional film obtained by laminating a plurality of layers on one side or both sides of a substrate, wherein the coating width of any layer that is not the outermost surface is 3 mm or more wider than the coating width of the outermost layer Laminated coating film.   The both ends of the said outermost surface layer are laminated | stacked in the position which does not protrude from the both ends of the layer which has a 3 mm or more wider application width than the said outermost surface layer, or the inner side. Laminated coating film.   The laminated coating film according to claim 1 or 2, wherein the outermost surface layer contains a slipping agent or an additive having silicone or a fluorine functional group.   The multilayer coating film according to claim 1, wherein a thickness of the outermost surface layer is 1 μm or less. In the method for producing a functional film obtained by laminating a plurality of layers on one side or both sides on a substrate,
After applying the coating liquid (A) on the substrate, drying the coating liquid (A), and further curing by irradiating with ultraviolet rays;
After the said process, after apply | coating the coating liquid (B) of a composition different from the said coating liquid (A) on the said coating liquid (A), this coating liquid (B) is dried and the coating liquid dried further Curing the
And a coating part of the coating liquid (B) is laminated at a position where it does not protrude from both ends of the coating part of the coating liquid (A) or on the inner side. Method.   The method for producing a multilayer coating film according to claim 5, wherein the coating width of the coating part of the coating liquid (A) is 3 mm or more wider than the coating width of the coating part of the coating liquid (B). A method for producing a film.   The method for producing a multilayer coating film according to claim 5, wherein the coating liquid (B) contains a sliding agent or additive having silicone or a fluorine functional group.   The method for producing a multilayer coating film according to claim 5, wherein the coating liquid (B) has a thickness after curing of 1 μm or less.

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