JP2014058125A - Laminate film, hard coat film, touch panel, and method for manufacturing the same - Google Patents

Abstract

Provided is a laminated film including a polyester resin, which can suppress occurrence of uneven interference and can exhibit excellent adhesion.
A laminated film 3 comprising a support 1 comprising a polyester film and a laminated film 2 laminated on at least one surface of the support, the laminated film having a glass transition temperature of 80 to 130 ° C. A first polyester resin, a second polyester resin having a glass transition temperature of 0 to 80 ° C., and inorganic fine particles, wherein the second polyester resin contains triethylene glycol as a diol component, The content rate of ethylene glycol is related with the laminated | multilayer film which are 10-50 mol% with respect to the said diol component.
[Selection] Figure 1

Description

  The present invention relates to a laminated film, a hard coat film, and a touch panel. Specifically, the present invention relates to a laminated film having a layer containing two types of polyester resins having different glass transition temperatures, a hard coat film obtained by laminating a hard coat layer on the laminated film, and a touch panel equipped with the hard coat film. . Furthermore, this invention relates to the manufacturing method of these laminated | multilayer film, a hard coat film, and a touch panel.

  2. Description of the Related Art Conventionally, a touch panel is frequently used for an electronic device on which a display device is mounted. Since the touch panel is provided on the surface layer of the electronic device, the touch panel is required to have scratch resistance, impact resistance, and the like. For this reason, a hard coat film having a hard coat layer is used for the touch panel. The hard coat film has a laminated structure in which a hard coat layer and a support such as a polyester film are laminated.

  In general, functional layers such as a polyester film and a hard coat layer are composed of different components, so that it is difficult to directly bond them together. For this reason, the laminated film which functions as an easily bonding layer is provided on the polyester film, and the hard-coat layer is laminated | stacked on it, and it is set as the hard-coat film. For example, Patent Document 1 discloses a hard coat film having a polyester film and a hard coat layer. Here, two types of polyester resins having different glass transition temperatures are used for the laminated film. It has also been proposed to suppress the occurrence of interference unevenness by adjusting the refractive index of the laminated film.

Patent Documents 2 and 3 disclose that a polyester resin using a specific diol component is used for a polyester film.
In Patent Document 2, a laminated film is formed using two types of polyester resins having different glass transition temperatures, and diethylene glycol is used as a diol component of the polyester resin having a low glass transition temperature. Patent Document 3 discloses a laminated film formed using one kind of polyester resin, and triethylene glycol is used as a diol component. In these documents, it is proposed to increase the adhesive force with the adherend layer by specifying the diol component of the polyester resin.

JP 2007-253512 A JP 2002-337287 A JP 2006-213860 A

  However, the inventors of the present application have clarified that interference unevenness occurs when the laminated film of Patent Document 1 is laminated on a hard coat layer having a high refractive index to form a hard coat film. Moreover, since it is not assumed that the laminated films of Patent Documents 2 and 3 are laminated on the hard coat layer, when the hard coat film is used, interference unevenness is generated by the study of the present inventors. It was revealed.

  Furthermore, the inventors of the present application have clarified that the laminated films of Patent Documents 1 and 2 have insufficient adhesion. That is, in the conventional laminated film, there is a problem that it is impossible to achieve both suppression of interference unevenness and ensuring adhesion.

  Therefore, in order to solve the problems of the prior art, the present inventors are a laminated film containing a polyester resin, can suppress the occurrence of uneven interference, and can exhibit excellent adhesion. Investigations have been made for the purpose of providing a laminated film having a laminated film.

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present application have found that it is possible to achieve both suppression of interference unevenness and ensuring adhesion by setting the configuration of the laminated film as a specific condition. Specifically, two types of polyester resins having different glass transition temperatures and inorganic fine particles are contained in the laminated film, and the occurrence of interference unevenness is achieved by using triethylene glycol as the diol component of the polyester resin having a low glass transition temperature. Although suppressing, it succeeded in obtaining the laminated | multilayer film excellent in adhesiveness, and came to complete this invention.
Specifically, the present invention has the following configuration.

[1] A laminated film comprising a support containing a polyester film and a laminated film laminated on at least one surface of the support, wherein the laminated film has a glass transition temperature of 80 to 130 ° C. Polyester resin, a second polyester resin having a glass transition temperature of 0 to 80 ° C., and inorganic fine particles, wherein the second polyester resin contains triethylene glycol as a diol component, Content rate is a laminated film which is 10-50 mol% with respect to all the diol components of a said 2nd polyester resin.
[2] The laminated film according to [1], wherein the second polyester resin contains naphthalenedicarboxylic acid or fluorenedicarboxylic acid as an acid component.
[3] The laminated film according to [2], wherein the refractive index of the first polyester resin is 1.6 or more.
[4] The laminated film according to any one of [1] to [3], wherein the content of the inorganic fine particles is 40 to 80% by mass with respect to the laminated film.
[5] The laminated film according to any one of [1] to [4], wherein the inorganic fine particles are inorganic oxide fine particles.
[6] The laminated film according to any one of [1] to [5], wherein the second polyester resin has a number average molecular weight of 15,000 to 40,000.
[7] A hard coat film further comprising a hard coat layer on the surface of the laminated film of the laminated film according to any one of [1] to [6].
[8] A touch panel comprising the hard coat film according to [7] and a transparent electrode layer.

  According to the present invention, it is possible to obtain a laminated film capable of suppressing the occurrence of uneven interference and exhibiting high adhesion. Thereby, the laminated film of the present invention is preferably used for a hard coat film. In addition, in the hard coat film, the occurrence of uneven interference can be suppressed and high adhesion between the laminated film and the hard coat layer can be obtained, so that a high quality and highly durable hard coat film can be obtained. .

FIG. 1 is a cross-sectional view showing an example of the laminated film of the present invention. FIG. 2 is a cross-sectional view showing an example of the hard coat film of the present invention.

Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be made based on representative embodiments and specific examples, but the present invention is not limited to such embodiments. In the present specification, a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
Moreover, (meth) acrylate is used in the meaning containing both acrylate and methacrylate.

  The laminated film of the present invention includes a support containing a polyester film and a laminated film laminated on at least one surface of the support. The laminated film includes a first polyester resin having a glass transition temperature of 80 to 130 ° C., a second polyester resin having a glass transition temperature of 0 to 80 ° C., and inorganic fine particles. Here, the second polyester resin contains triethylene glycol as a diol component, and the content of triethylene glycol is 10 to 50 mol% with respect to the total diol component of the second polyester resin.

(Support)
The laminated film according to the present invention includes a support. The support is composed of a polyester film. Here, the polyester film refers to a film whose main component is polyester. Usually, it refers to a film in which 98% by mass or more of the resin component is polyester, and preferably refers to a film in which 90% by mass of the component constituting the polyester film is polyester. The kind in particular of polyester is not restrict | limited, A well-known thing can be used as polyester. Specific examples include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate. Among them, it is particularly preferable to use polyethylene terephthalate (PET) from the viewpoint of cost and mechanical strength.

  The polyester film in the present invention is preferably biaxially stretched. Biaxial stretching refers to stretching in both directions by regarding the width direction and the longitudinal direction of the film as uniaxial. Thus, the biaxially stretched polyester film has very good mechanical strength because the molecular orientation in the biaxial direction is sufficiently controlled. The draw ratio is not particularly limited, but the draw ratio in one direction is preferably 1.5 to 7 times, more preferably 2 to 5 times. In particular, a polyester film that has been biaxially stretched at a stretching ratio of 2 to 5 times per uniaxial direction has a very excellent mechanical strength because the molecular orientation is controlled more efficiently and effectively. Suitable as a film. By setting the draw ratio of the polyester film to 1.5 times or more, sufficient mechanical strength can be obtained as compared with the case of less than 1.5 times. Further, by setting the draw ratio to 7 times or less, a uniform thickness can be obtained as compared with the case where the draw ratio exceeds 7 times.

  The thickness of the support is preferably 30 to 400 μm, and more preferably 50 to 250 μm. The support in the present invention may consist of only one layer of a polyester film, or may be a laminate of two or more layers of polyester film (for example, a co-flow film or a co-extruded film). When the polyester film in this invention consists of two or more layers, the total thickness becomes in the said range.

  The polyester film may be subjected to a surface treatment. Examples of the surface treatment in this case include corona treatment, flame treatment, vacuum plasma treatment, atmospheric pressure plasma treatment, and glow discharge treatment. By performing the surface treatment of the polyester film, it is possible to enhance the adhesion with the laminated film described later.

From the viewpoint of transparency, the polyester film preferably has a refractive index of 1.63 to 1.71, more preferably 1.62 to 1.68.
Further, the polyester film may contain other additives without departing from the gist of the present invention, and examples thereof include antioxidants and ultraviolet inhibitors.

(Laminated film)
A laminated film refers to a layered structure formed on the surface of a support. The laminated film functions as an easy-adhesion layer that adheres the polyester film constituting the support and a functional layer such as a hard coat layer.

The laminated film includes a first polyester resin having a glass transition temperature of 80 to 130 ° C., a second polyester resin having a glass transition temperature of 0 to 80 ° C., and inorganic fine particles. When the glass transition temperature of the first polyester resin is Tg ₁ , Tg ₁ may be 80 to 130 ° C., preferably 90 to 120 ° C., and more preferably 100 to 115 ° C. Further, when the glass transition temperature of the second polyester resin as a Tg _2, Tg ₂ may be any 0 to 80 ° C., more be preferably from 20 to 70 ° C., is 30 to 60 ° C. preferable. By setting Tg ₁ and Tg ₂ within the above range, adhesion between the laminated film and other layers can be enhanced.

The difference in glass transition temperature between the first polyester resin and the second polyester resin (Tg ₁ −Tg ₂ ) is preferably 20 ° C. or higher, and more preferably 40 ° C. or higher. By setting Tg ₁ -Tg ₂ to the above lower limit value or more, the adhesion can be more effectively improved.

  When the content rate of the first polyester resin contained in the laminated film is P and the content rate of the second polyester resin is Q, it is preferable that P: Q = 20: 80 to 80:20, : 70 to 70:30 is more preferable, and 40:60 to 60:40 is even more preferable. By setting P: Q within the above range, good adhesive properties can be obtained.

  The second polyester resin contains triethylene glycol as a diol component. Triethylene glycol can enhance the adhesive properties of the laminated film formed using the second polyester resin. Furthermore, since triethylene glycol does not lower the specific gravity of the second polyester resin, the barrier property of the laminated film can be improved.

  The content rate of a triethylene glycol is 10-50 mol% with respect to all the diol components of a 2nd polyester resin. The content rate of triethylene glycol should just be 10-50 mol%, it is preferable that it is 15-45 mol%, and it is more preferable that it is 20-40 mol%.

  The second polyester resin contains terephthalic acid, isophthalic acid, and sodium sulfoisophthalate as acid components.

  The number average molecular weight of the second polyester resin is 15000-40000. The number average molecular weight of the second polyester resin may be 15000 to 40000, preferably 17000 to 30000, and more preferably 18000 to 25000. By setting the number average molecular weight of the second polyester resin within the above range, the adhesion between the laminated film and the polyester film, particularly the adhesion after wet heat aging can be enhanced.

The refractive index of the first polyester resin is preferably 1.6 or more. Further, the refractive index of the first polyester resin is more preferably 1.60 to 1.75, and further preferably 1.60 to 1.70. By setting the refractive index of the first polyester resin within the above range, the refractive index of the laminated film can be set to a desired range.
The first polyester resin contains terephthalic acid, isophthalic acid, sodium sulfoisophthalate, naphthalenedicarboxylic acid or fluorenedicarboxylic acid as an acid component. Among these, it is particularly preferable to include naphthalenedicarboxylic acid or fluorenedicarboxylic acid. Naphthalenedicarboxylic acid or fluorenedicarboxylic acid is preferably used because it can increase the refractive index of the laminated film.

The laminated film according to the present invention contains inorganic fine particles. By including the inorganic fine particles, the refractive index of the easy-adhesion layer can be adjusted. The laminated film and hard coat film of the present invention are preferably used for touch panel applications, but in the touch panel applications, the adjustment of the refractive index is extremely important. In this invention, even if it is a case where the hard-coat layer with a high refractive index is laminated | stacked by containing an inorganic fine particle, it can suppress that an interference nonuniformity generate | occur | produces in a hard-coat film.
The refractive index n ₁ of the laminated film preferably satisfies n _PE ≈n ₁ where n _PE is the refractive index of the polyester film. The refractive index of the laminated film is preferably 1.63-1.68, and more preferably 1.63-1.66.

Examples of the inorganic fine particles blended in the laminated film include conductive metal fine particles and metal oxide fine particles. Specific examples of the metal include antimony, selenium, titanium, tungsten, tin, zinc, indium, zirconia and the like.
The inorganic fine particles are preferably inorganic oxide fine particles, and examples of the inorganic oxide fine particles include fine particles mainly containing one or more of tin oxide, zirconium oxide, and titanium oxide. Here, the main component means a component having the largest blending amount contained in the fine particles, and usually means 80% by mass or more.
As the inorganic oxide fine particles, it is preferable to use tin oxide. Further, as the tin oxide, tin (IV) oxide having a SnO ₂ composition is preferably used. The use of tin oxide doped with antimony or the like is preferable because it has conductivity, and therefore the effect of reducing the surface resistivity of the laminated film and preventing impurities such as dust from adhering can be obtained. Specific examples of such antimony-doped tin oxide include commercially available FS-10D, SN-38F, SN-88F, SN-100F, TDL-S, and TDL-1 (all of which are Ishihara Sangyo ( Etc.), and the like can also be suitably used in the present invention. On the other hand, in order to prevent malfunction of the touch panel, inorganic oxide fine particles having no conductivity may be preferably used. For example, tin oxide prepared so that tin oxide is not doped with antimony or the like and the surface low efficiency is not lowered can be suitably used (SDL-2 manufactured by Mitsubishi Materials Electronics Chemical Co., Ltd.).

The zirconium oxide has a composition of ZrO ₂ , and examples thereof include NZS-20A, NZS-30A (both manufactured by Nissan Chemical Co., Ltd.) and SZR-CW (manufactured by Sakai Chemical Industry Co., Ltd.), These can also be suitably used in the present invention.
As the titanium oxide, titanium (IV) oxide having a TiO ₂ composition is preferably used. Titanium oxide has a rutile type (tetragonal high-temperature type), anatase type (tetragonal low-temperature type), etc. depending on the difference in crystal structure, but is not particularly limited. Further, titanium oxide subjected to surface treatment may be used. Examples of titanium oxide that can be suitably used in the present invention include IT-S, IT-O, IT-W (all manufactured by Idemitsu Kosan Co., Ltd.), TTO-W-5 (Ishihara Sangyo Co., Ltd.). Manufactured) and the like.

  The average particle size of the inorganic fine particles as described above is preferably 5 to 200 nm. When the average particle size of the inorganic fine particles is 200 nm or less, the influence of light being scattered by the fine particles is reduced and it is difficult to become an obstacle, and when the average particle size is 5 nm or more, the fine particles are less likely to aggregate and become large. . The average particle size of the inorganic fine particles in the present invention is any 50 inorganic fine particles when the particle size is the diameter of a circle having the same area as the inorganic fine particles when the inorganic fine particles are photographed with a scanning electron microscope. Is the average value of the particle sizes determined for.

  The laminated film may further contain colloidal silica as inorganic fine particles. Colloidal silica is a colloid in which silicon dioxide or a hydrate thereof is dispersed in water, and refers to a colloidal particle having an average particle diameter of 3 nm to 300 nm. Colloidal silica has a function of adjusting the friction of the laminated film.

The compounding ratio of the inorganic fine particles in the laminated film can be 40 to 80% by mass with respect to the laminated film. The blending ratio of the inorganic fine particles may be 40 to 80% by mass, preferably 45 to 75% by mass, and more preferably 50 to 70% by mass. Only one type of fine particles may be blended in the easy adhesion layer, or two or more types may be used. When two or more types of inorganic fine particles are used, it is preferable that the total of the two types of contents falls within the above range.
By setting the blending ratio of the inorganic fine particles within the above range, the refractive index of the laminated film can be set within a desired range. Specifically, the refractive index of the laminated film can be set to 1.63 to 1.68. By setting the refractive index of the laminated film to 1.63 to 1.68, it is possible to suppress occurrence of interference unevenness when the laminated film is used for a hard coat film.

  The thickness of the laminated film is preferably 30 to 200 nm, and more preferably 50 to 180 nm, in order to further develop the adhesion to the polyester film. By setting the film thickness of the easy adhesion layer to 30 nm or more, the adhesion between the polyester film and the easy adhesion layer can be enhanced. By setting the thickness of the easy adhesion layer to 200 nm or less, the surface state of the easy adhesion layer can be made good.

  The laminated film may contain polyolefin, acrylic, polyurethane, rubber-based resin or the like as a binder in order to further improve the adhesion to the polyester film.

  A polyolefin having a polar group such as a carboxyl group is preferred as an ionomer of a polyolefin having a polar group. It may be used by dissolving in an organic solvent, or an aqueous dispersion may be used. However, since the environmental load is small, it is preferable to attach with an aqueous system using an aqueous dispersion. A commercially available product may be used as the aqueous dispersion and is not particularly limited. Examples of those that can be preferably used in the present invention include Chemipearl S75N (manufactured by Mitsui Chemicals), Arrow Base SE1200. Arrowbase SB1200 (manufactured by Unitika Ltd.), Hitech S3111, S3121 (manufactured by Toho Chemical Co., Ltd.), and the like. Only one type of polyolefin may be included, or two or more types may be included.

The acrylic resin can be obtained by copolymerizing monomers exemplified below. That is, alkyl acrylate, alkyl methacrylate (alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, 2-ethylhexyl, cyclohexyl, etc.); 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 and methacrylic acid Carboxylic acids such as 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 having a 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 a methyl group, an ethyl group, n -Propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, 2-ethylhexyl group, cyclohexyl group, etc.), N-alkoxyacrylamide, N-alkoxymethacrylamide, N, N-dialkoxyacrylamide, N , N-dialkoxymethacrylamide (alkoxy groups include methoxy, ethoxy, butoxy, isobutoxy, etc.), acryloylmorpholine, N-methylolacrylamide, N-methylolmethacrylamide, N-phenol Monomers having an amide group such as ruacrylamide and N-phenylmethacrylamide; monomers of acid anhydrides such as maleic anhydride and itaconic anhydride; 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline Oxazolines such as 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-methyl-2-oxazoline Group-containing monomers: methoxydiethylene glycol methacrylate, methoxypolyethylene glycol methacrylate, vinyl isocyanate, allyl isocyanate, styrene, α-methylstyrene, vinyl methyl ether, vinyl ethyl ether, vinyl trialkoxysilane, alkyl maleic acid Monoester, alkyl fumaric acid monoesters, alkyl itaconic acid monoester, acrylonitrile, methacrylonitrile, vinylidene chloride, ethylene, propylene, vinyl chloride, vinyl acetate, butadiene.
The acrylic resin preferably has a glass transition temperature of -50 to 120 ° C, more preferably -30 to 100 ° C. The acrylic resin preferably has a weight average molecular weight of 3000 to 1000000.

  The polyurethane includes a polyol, a polyisocyanate, a chain extender, a crosslinking agent, and the like. Examples of polyols include polyoxyethylene glycol, polyoxypropylene glycol, polyethers such as polyoxytetramethylene glycol, polyethylene adipate, polyethylene-butylene adipate, polycaprolactone, and the like by a dehydration reaction of dicarboxylic acid. There are polyesters to be produced, polycarbonates having carbonate bonds, acrylic polyols, castor oil and the like. Examples of polyisocyanates include tolylene diisocyanate, phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, and the like. Examples of chain extenders or crosslinking agents include ethylene glycol, propylene glycol, diethylene glycol, trimethylolpropane, hydrazine, ethylenediamine, diethylenetriamine, triethylenetetramine, 4,4′-diaminodiphenylmethane, 4,4′-diaminodicyclohexylmethane, Water etc. are mentioned.

  The laminated film may contain a crosslinking agent, a matting agent, a surfactant, an antistatic agent, a slipping agent, and the like, if necessary, in addition to the polyester resin and the inorganic fine particles.

  Examples of the crosslinking agent include epoxy-based, isocyanate-based, melamine-based, carbodiimide-based, and oxazoline-based crosslinking agents. Among these, a carbodiimide type crosslinking agent and an oxazoline type crosslinking agent are preferable.

  As the carbodiimide-based crosslinking agent, a compound having a plurality of carbodiimide structures in the molecule is preferable. By including such a compound, the adhesion between the hard coat layer and the easy-adhesion layer tends to be improved when the hard coat layer is provided. A compound having a plurality of carbodiimide groups in the molecule can be used without particular limitation. Polycarbodiimide is usually synthesized by condensation reaction of organic diisocyanate, but the organic group of the organic diisocyanate used in this synthesis is not particularly limited, either aromatic or aliphatic, or a mixture thereof It can be used. However, aliphatic systems are particularly preferred from the viewpoint of reactivity. As the synthetic raw material, organic isocyanate, organic diisocyanate, organic triisocyanate and the like are used.

  As examples of organic isocyanates, aromatic isocyanates, aliphatic isocyanates, and mixtures thereof can be used. Specifically, 4,4'-diphenylmethane diisocyanate, 4,4-diphenyldimethylmethane diisocyanate, 1,4-phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, hexamethylene diisocyanate, cyclohexane Diisocyanate, xylylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 1,3-phenylene diisocyanate, etc. are used, and organic monoisocyanates include isophorone isocyanate, phenyl isocyanate. Cyclohexyl isocyanate, butyl isocyanate, naphthyl isocyanate and the like are used. Moreover, the carbodiimide type compound which can be used for this invention is also available as commercial items, such as carbodilite V-02-L2 (brand name: Nisshinbo Co., Ltd. product).

  Specific examples of the oxazoline-based crosslinking agent include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-ethyl-2-oxazoline, 2,2′-bis- (2-oxazoline), 2,2′-methylene-bis- (2 -Oxazoline), 2,2'-ethylene-bis- (2-oxazoline), 2,2'-trimethylene-bis- (2-oxazoline), 2,2'-tetramethylene-bis- (2-oxazoline), 2,2′-hexamethylene-bis- (2-oxazoline), 2,2′-octamethylene-bis- (2-oxazoline), 2,2′-ethylene-bis- (4 4'-dimethyl-2-oxazoline), 2,2'-p-phenylene-bis- (2-oxazoline), 2,2'-m-phenylene-bis- (2-oxazoline), 2,2'-m -Phenylene-bis- (4,4'-dimethyl-2-oxazoline), bis- (2-oxazolinylcyclohexane) sulfide, bis- (2-oxazolinyl norbornane) sulfide and the like. Furthermore, (co) polymers of these compounds can also be preferably used. Further, as a compound having an oxazoline group, Epocros K2010E, K2020E, K2030E, WS500, WS700 (all manufactured by Nippon Shokubai Chemical Co., Ltd.) and the like can be used.

  When the crosslinking agent in the present invention contains a crosslinking agent, it is preferably added in the range of 1 to 200% by mass, more preferably in the range of 5 to 100% by mass with respect to the total amount of the binder. . By making the addition amount 1% by mass or more, prevention of fine particle peeling becomes effective. On the other hand, when the addition amount is 200% by mass or less, the surface shape tends to be further improved. Two or more types of crosslinking agents may be included, and when two or more types are included, the total amount is preferably within the above range.

  As the matting agent, either organic or inorganic fine particles can be used. For example, polymer fine particles such as polystyrene, polymethyl methacrylate, silicone resin, and benzoguanamine resin, and inorganic fine particles such as silica, calcium carbonate, magnesium oxide, and magnesium carbonate can be used. Among these, polystyrene, polymethyl methacrylate, and silica are preferable from the viewpoint of the effect of improving the slipperiness and cost.

The average particle size of the matting agent is preferably 0.03 to 1 μm, more preferably 0.05 to 0.5 μm. By making the average particle size of the matting agent 0.03 μm or more, the effect of improving the slip property is effectively exhibited, and by making the average particle size 1 μm or less, it tends to be able to suppress the deterioration of display quality of the display device. is there. When the matting agent is contained, the addition amount of the matting agent varies depending on the average particle size, but is preferably 0.1 to 30 mg / m ² , more preferably 0.5 to 20 mg / m ² . . When the addition amount of the fine particles is 0.1 mg / m ² or more, the effect of improving the slip property is more effectively exhibited, and when the addition amount is 30 mg / m ² or less, the transparency is lowered and the display device is displayed. It is possible to more effectively suppress the deterioration of display quality. Two or more types of matting agents may be included, and when two or more types are included, the total amount is preferably within the above range.
The average particle size of the matting agent in the present invention is a value measured by the same method as the average particle size of the fine particles described above. Regarding the detailed description, since the fine particles are replaced with the matting agent in the above description, the detailed description is omitted here.

Examples of the surfactant include known anionic, nonionic, and cationic surfactants. Surfactants are described in, for example, “Surfactant Handbook” (Nishi Ichiro, Imai Shun-ichiro, Kasai Shozo edited by Sangyo Tosho Co., Ltd., 1960). Moreover, when it contains surfactant, it is preferable that it is 0.1-30 mg / m < ² > as addition amount of this surfactant, More preferably, it is 0.2-10 mg / m < ² >. When two or more types of surfactant are included, the total amount is preferably within the above range. It is possible to effectively suppress repellency by setting the addition amount of the surfactant to 0.1 mg / m ² or more. By setting the addition amount to 30 mg / m ² or less, the surface condition tends to be improved.

The type of the antistatic agent is not particularly limited. For example, an electron conductive polymer such as polyaniline and polypyrrole, an ion conductive polymer having a carboxyl group or a sulfonic acid group in the molecular chain, conductive fine particles, etc. Is mentioned. Among these, the conductive tin oxide fine particles described in JP-A-61-20033 can be preferably used from the viewpoints of conductivity and transparency. The addition amount of the antistatic agent is preferably added so that the surface resistivity of the easy adhesion layer measured in an atmosphere of 25 ° C. and 30% RH is 1 × 10 ⁵ Ω or more and 1 × 10 ¹³ Ω or less. The surface resistivity can be suppressed 1 × 10 and a ⁵ Omega or lower the amount of the antistatic agent tends to transparency improvement of the laminated film, by the following 1 × 10 ¹³ Omega, dust It tends to be more difficult to adhere.

The laminated film preferably contains an aliphatic wax as a slip agent. Thereby, the lubricity of the film surface can be obtained. The amount of the case of blending the fat-aliphatic wax is preferably 0.5 to 30 mg / m ^2, more preferably ^{1mg / m 2 ~10mg / m 2} . By making this content 0.5 mg / m ² or more, the slipperiness of the laminated film tends to be improved. By setting it to 30 mg / m ² or less, adhesion to a polyester film and easy adhesion to a hard coat layer, a pressure-sensitive adhesive, etc. tend to be further improved.
Specific examples of the aliphatic wax include plant-based waxes such as carnauba wax, candelilla wax, rice wax, wood wax, jojoba oil, palm wax, rosin modified wax, cucumber wax, sugar cane wax, esparto wax, and 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, and fishertro push wax And synthetic hydrocarbon waxes such as polyethylene wax, oxidized polyethylene wax, polypropylene wax, and oxidized polypropylene wax. Among these, carnauba wax, paraffin wax, and polyethylene wax are particularly preferable because they are easy to adhere to hard coats and pressure-sensitive adhesives and have good lubricity. These are preferably used as water dispersions because they can reduce the environmental burden and are easy to handle.

  The laminated film may be a single layer or a plurality of layers. For example, when the laminated film has a two-layer structure, the second layer is provided on the first layer. The second layer may be provided on the surface of the first layer, or may be provided on the surface of the first layer via another layer. In this case, the second layer may contain the same binder as the first layer, or may contain a different kind of binder. Depending on the layer structure to be laminated, it is preferable to include a different type of binder from the first layer. Thereby, the adhesiveness of a polyester film and a hard-coat layer can be improved.

  Similar to the first layer, the second layer may contain fine particles and, if necessary, a crosslinking agent, a matting agent, a surfactant, an antistatic agent, a slipping agent, and the like.

(Laminated film)
What laminated | stacked the support body containing a polyester film and one or more layers is used as a laminated film. As shown in FIG. 1, a laminated film 2 is laminated on a support 1 to obtain a laminated film 3. The laminated film having the support and laminated film having the above-described configuration can exhibit high adhesion when the hard coat layer is laminated on the laminated film. The laminated film of the present invention can maintain high adhesion even when placed under a high temperature and high humidity condition for a long time. Furthermore, when a hard coat layer is laminated on a laminated film to form a hard coat film, it is possible to suppress occurrence of interference unevenness.

  A release layer may be further formed on the surface of the laminated film of the laminated polyester film of the present invention. Since the laminated film has adhesiveness, if it is exposed, it may adhere to an unintended article, or the laminated film itself may deteriorate. For this reason, in order to physically and chemically protect the laminated film, a release layer is provided on the surface of the laminated film, and when used, the release layer is peeled off to expose the laminated film. Members can be stacked.

  Examples of the release layer include those in which a release agent layer such as silicone is applied to various plastic films to form a release agent layer, and a polypropylene film alone, which is used as a release sheet for ordinary pressure-sensitive adhesive sheets Can be used.

(Hard coat layer)
The laminated film of the present invention can be preferably used as a hard coat film by laminating a hard coat layer on the surface of the laminated film. As shown in FIG. 2, the hard coat layer 4 is laminated on the surface of the laminated film 2 of the laminated film 3 on the surface opposite to the surface on which the support 1 is laminated. Configure.

  The hard coat layer is preferably composed mainly of a curable resin having high chemical resistance and scratch resistance. Examples of such a curable resin include an ionizing radiation curable resin, a thermosetting resin, and a thermoplastic resin. Preferably, the film forming operation is easy with respect to the laminated film and the pencil hardness is set to a desired value. It is an ionizing radiation curable resin that can be easily increased.

  As the ionizing radiation curable resin used for forming the hard coat layer, those having an acrylate functional group are preferable, and polyester acrylate or urethane acrylate is particularly preferable. The polyester acrylate is composed of an oligomer (meth) acrylate of a polyester-based polyol. The urethane acrylate is composed of an acrylated oligomer composed of a polyol compound and a diisocyanate compound. In addition, as a monomer constituting the acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2 ethylhexyl (meth) acrylate, methoxyethyl (meth) acrylate, butoxyethyl (meth) acrylate And phenyl (meth) acrylate.

  In order to further increase the hardness of the hard coat layer, a polyfunctional monomer can be used in combination. Specific polyfunctional monomers include, for example, trimethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate , Dipentaerythritol hexa (meth) acrylate, 1,6 hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and the like.

  Polyester oligomers used to form the hard coat layer include adipic acid and glycol (ethylene glycol, polyethylene glycol, propylene glycol, butylene glycol, polybutylene glycol, etc.) and triol (glycerin, trimethylolpropane, etc.) sebacic acid and glycol Examples thereof include polyadipate triol which is a condensation product with triol and polysebacate polyol. Note that a part or all of the aliphatic dicarboxylic acid may be substituted with another organic acid. In this case, as the other organic acid, isophthalic acid, terephthalic acid, phthalic anhydride, or the like is preferable because high hardness is expressed in the hard coat layer.

  The polyurethane oligomer used for forming the hard coat layer can be obtained from the condensation product of polyisocyanate and polyol. Specific polyisocyanates include adducts of methylene bis (p-phenylene diisocyanate), hexamethylene diisocyanate / hexane triol, hexamethylene diisocyanate, tolylene diisocyanate, tolylene diisocyanate trimethylolpropane, 1,5- Examples include naphthylene diisocyanate, thiopropyl diisocyanate, ethylbenzene-2,4-diisocyanate, 2,4-tolylene diisocyanate dimer, hydrogenated xylylene diisocyanate, tris (4-phenylisocyanate) thiophosphate. Specific polyols include polyether polyols such as polyoxytate and methylene glycol, polyadipate polyols, and polycarbonate polyols. What polyester polyols, such as copolymers of acrylic acid esters and hydroxyethyl methacrylate can be exemplified.

  Furthermore, when using an ultraviolet curable resin as the ionizing radiation curable resin, photopolymerization of acetophenones, benzophenones, mifilabenzoyl benzoate, α-amyloxime ester, or thioxanthone is started in these resins. It is preferable to use n-butylamine, triethylamine, tri-n-butylphosphine and the like as photosensitizers as a photosensitizer.

  In addition, urethane acrylate is rich in elasticity and flexibility and excellent in workability (bendability), but on the other hand, since the surface hardness is insufficient, it is difficult to obtain a pencil hardness of 2H or more. On the other hand, the polyester acrylate can form a hard coat layer with extremely high hardness by selecting the constituent components of the polyester. Then, since it is easy to make high hardness and flexibility compatible, the hard-coat layer which mix | blended polyester acrylate 40-10 mass parts with respect to urethane acrylate 60-90 mass parts is preferable.

  The hard coat layer may contain an ultraviolet absorber. As a result, UV degradation of the laminated film and the colorant (particularly dye-based) can be prevented, and visibility and explosion-proof properties can be maintained for a long time. The kind of ultraviolet absorber is not specified. The addition amount is preferably 0.1 to 10% by mass with respect to the resin forming the hard coat layer. By setting the content to 0.1% by mass or more, the effect of preventing ultraviolet light deterioration is sufficiently exhibited, and by setting the content to 10% by mass or less, it is possible to more effectively suppress a decrease in wear resistance and scratch resistance. As a method of adding the ultraviolet absorber, a method of adding it by dispersing in a solvent is preferable.

Although the thickness of a hard-coat layer is not specifically limited, The range of 1-15 micrometers is preferable.
The refractive index of the hard coat layer in the invention is preferably 1.50 to 2.10, more preferably 1.55 to 2.00, and further preferably 1.60 to 1.80. The refractive index n _HC of the hard coat layer preferably satisfies n ₁ ≈n _HC when the refractive index of the laminated film is n ₁ .

A hard coat film can be made into a touch panel by laminating a transparent electrode layer. In general, ITO (indium tin oxide) is used for the transparent electrode layer, and the electrode pattern is produced by patterning an ITO conductive film. The hard coat layer and the transparent electrode layer may be laminated so as to be in contact with each other, or an adjustment layer such as an optical adjustment layer may be laminated between the hard coat layer and the transparent electrode. The optical adjustment layer is provided to adjust the difference in refractive index between the layers.
The refractive index of ITO is about 2.1, which is larger than the refractive index of 1.6 of the polyester film that is the support substrate. Therefore, since the reflection intensity due to external light is different between the place where ITO is present and the place where ITO is not present, the ITO pattern can be seen and display quality is remarkably deteriorated. This phenomenon is called ITO bone appearance.
However, by setting the refractive index of the hard coat layer within the above range, it is possible to suppress the appearance of the transparent electrode when a transparent electrode layer or the like is laminated on the hard coat film to form a touch panel. Thereby, the number of adjustment layers, such as an optical adjustment layer which comprises the laminated | multilayer film for touchscreens, can be reduced.

  The hard coat film may further have a laminated structure having other constituent layers. Specific examples include an optical adjustment layer, a gas barrier layer, a transparent electrode layer such as an ITO electrode, a prism layer, an antireflection layer, and the like. In particular, those having a hard coat film and a transparent electrode layer are preferably used as a touch panel.

The hard coat film can be preferably used for a liquid crystal display, a plasma display, an organic EL display, a CRT display, electronic paper, a touch panel, a PDP electromagnetic wave shielding film, and the like. Especially, it is preferable that the hard coat film of this invention is used for the laminated film for touch panels. Regarding the touch panel, descriptions in JP-A-2002-48913 can be referred to.
Since the hard coat film of the present invention has high transparency, it is particularly preferably used for touch panel applications, and the hard coat film of the present invention may be a hard coat film for touch panels.

(Production method)
Next, the production method of the laminated film, hard coat film and touch panel of the present invention will be described.

  The laminated film is usually formed on the surface of the polyester film by coating. There is no restriction | limiting in particular as an application | coating method, Well-known methods, such as bar coater application | coating and slide coater application | coating, can be used.

  A solvent (coating solvent) can be used when applying the laminated film. As the coating solvent, water, toluene, methyl alcohol, isopropyl alcohol, methyl ethyl ketone and the like, and aqueous and organic solvent based coating solvents such as a mixed system thereof can be used. Among these, the method using water as a coating solvent is preferable in view of cost and ease of production.

  The laminated film is cured by applying it in layers on a polyester film and then drying it. When the laminated film has a two-layer structure, it is preferable to apply the second layer and then dry it so that the effect is obtained.

The step of laminating the hard coat layer is a step of laminating the hard coat layer on the surface of the laminated film opposite to the surface on which the polyester film is laminated. The hard coat layer and the polyester film are laminated via a laminated film.
The hard coat layer can be formed, for example, by applying the hard coat layer composition to the surface of the laminated film. The hard coat layer composition is exemplified by a composition containing a curable resin. In this case, the solid content concentration of the hard coat layer composition is preferably 30 to 70% by mass, and more preferably 40 to 60% by mass.
As a method for applying the hard coat layer composition to the surface of the laminated film, a conventionally known method can be appropriately selected according to the characteristics and application amount of the hard coat layer composition. Specific examples include a roll coating method, a gravure coating method, a bar coating method, and an extrusion coating method.
The hard coat layer is usually cured after the hard coat layer composition is applied in layers. As a curing method, a curing method according to the material of the hard coat layer composition can be employed. For example, in the case of an ionizing radiation curable resin, curing is performed by ionizing radiation irradiation.

On the hard coat layer, another constituent layer may be further laminated to form a touch panel. For example, an optical adjustment layer can be laminated on the hard component layer. A plurality of optical adjustment layers may be laminated. In this case, the optical adjustment layer preferably has a different refractive index.
A transparent electrode layer can be further laminated on the optical adjustment layer. The transparent electrode layer can be used as a touch panel electrode.
Each of the optical adjustment layer and the transparent electrode layer can be appropriately selected from conventional known methods.

  The features of the present invention will be described more specifically with reference to examples and comparative examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples shown below.

  The evaluation criteria in the present invention are as follows.

(Evaluation of hard coat film adhesion and interference unevenness)
Using a single-edged razor, the surface of the sample to which the hard coat layer was applied was scratched by 6 scratches in the vertical and horizontal directions to form 25 squares. Next, a cellophane tape (trademark: No. 405 manufactured by Nichiban Co., Ltd., 24 mm width) is attached onto this, and then completely adhered by rubbing with poppy rubber from above, and then the tape is 90 degrees with respect to the hard coat layer. It peeled by pulling in the direction, and the following ranking was performed by obtaining the number of peeled squares to evaluate the adhesion between the hard coat layer and the easy adhesion layer. Evaluation ranks 3 to 5 are practically acceptable ranges.
5: No peeling occurs 4: The peeled squares are zero, but the scratch part is slightly peeled off.
3: The square which peeled was less than 1 square.
2: The square which peeled was 1 square or more and less than 5 squares.
1: The square which peeled was 5 squares or more.

(Evaluation of adhesion after wet heat aging)
Each polymer sheet was held for 500 hours under the environmental conditions of 80 ° C. and 10% RH and 65 ° C. and 95% RH, and then conditioned for 1 hour under the environment of 25 ° C. and 60% RH. The adhesion was evaluated by the method.

(Evaluation of uneven interference)
The sample coated with the hard coat layer was irradiated on the coated layer with the diffused light of a three-wavelength fluorescent lamp that passed through a milky white acrylic plate from a desk on which a black doskin cloth was laminated, and the generated reflected light was visually observed. And the rainbow-shaped interference nonuniformity observed at this time was judged by the following reference | standard, and this was evaluated as a coating surface shape. Moreover, in visual judgment, the blackening process was performed with respect to the sample as forced condition evaluation, and it adjusted so that the transmittance | permeability of 500 nm light might be set to 1% or less. As blackening treatment, magic ink (artline oil-based marker supplement ink KR-20 black, manufactured by shachihata Co., Ltd.) was applied to the surface of the sample opposite to the surface to be observed, and then dried. .
A: Iridescent interference unevenness is not visually confirmed in both the blackened sample and the untreated sample.
C: Iridescent interference unevenness is visually confirmed in both the blackened sample and the untreated sample.

<Synthesis of polyester resin X-1>
As an acidic component, 64 mol% of 2,6-naphthalenedicarboxylic acid, 14 mol% of terephthalic acid, 22 mol% of sodium 5-sulfoisophthalate, and as a diol component, 73 mol% of ethylene glycol and 27 mol% of diethylene glycol are used as the first polyester. Resin X-1 was synthesized. The glass transition temperature of the first polyester resin was 110 ° C., the number average molecular weight was 24000, and the refractive index was 1.63. The refractive index shows a value at a wavelength of 660 nm. The composition and physical properties of the polyester resin are summarized in Table 1.

<Synthesis of polyester resin X-2>
Polyester resin X-2 containing 70 mol% terephthalic acid as an acidic component, 17 mol% isophthalic acid, 13 mol% sodium 5-sulfoisophthalate, and 84 mol% ethylene glycol and 16 mol% diethylene glycol as a diol component Synthesized. The glass transition temperature was 69 ° C., the number average molecular weight was 23000, and the refractive index was 1.57. The composition and physical properties of the polyester resin are summarized in Table 1.

<Synthesis of polyester resins Y-1 to Y-5>
A predetermined amount of terephthalic acid, isophthalic acid, sodium 5-sulfoisophthalate, ethylene glycol, diethylene glycol, triethylene glycol and zinc acetate and antimony trioxide as a catalyst were charged in a reaction vessel so as to obtain the polymer composition of Table 1. 220 ° C The esterification reaction was carried out. Subsequently, a polycondensation reaction was performed for 3 hours at 250 ° C. and a reduced pressure of 0.1 mHg. Table 1 shows the physical property values of the obtained polyester resin.

The glass transition temperature shown in Table 1 was measured by DSC as follows. 10 mg of polyester resin is weighed and set in an aluminum pan. At a rate of temperature increase of 10 ° C./min, the temperature is raised from room temperature to 300 ° C., rapidly cooled, and again heated at 10 ° C./min to obtain a DSC curve. The temperature at which the obtained DSC curve is bent is defined as the glass transition temperature.
The number average molecular weight was measured by GPC (standard material polystyrene).

(Examples 1-4 and Comparative Examples 1-3)
Thus, the obtained polyester resin was mixed in the ratio shown in Table 2, and the laminated film was produced. In addition, Daicel Finechem Co., Ltd. AS-563A is used for the acrylic resin, Nisshinbo Co., Ltd. Carbodilite V-02-L2 is used for the carbodiimide cross-linking agent, and Mitsubishi Materials Electronics Chemical SDL-2 is used for the tin oxide fine particles. For banawax, Chukyo Oil Co., Ltd. cellosol 524, for colloidal silica, Nissan Chemical Industries Co., Ltd. Snowtex XL, for surfactant A, Nippon Oil Co., Ltd. Rapisol A-90, for surface activity As the agent B, NAROACTY CL-95 manufactured by Sanyo Chemical Industries, Ltd. was used.

<Creation of hard coat film>
A hard coat film was prepared by providing a hard coat layer on the laminated films of the above Examples and Comparative Examples.
An ultraviolet curable resin (manufactured by JSR Co., Ltd., Z7410B) is applied on both surfaces of the laminated film so that the film thickness is about 2 μm, and then an application layer is provided. It was. Next, the dried coating layer was irradiated with ultraviolet rays using a high pressure mercury lamp to cure the resin, thereby forming a hard coat layer having a thickness of 1 μm. In addition, the irradiation amount of the ultraviolet-ray with respect to a coating layer was 1000 mJ / cm < ² >. The refractive index of the hard coat layer was 1.63.

  Table 3 summarizes the results of evaluating the adhesion and the degree of interference unevenness of the hard coat films in which the hard coat layers were provided on the laminated films of Examples 1 to 4 and Comparative Examples 1 to 3.

(Examples 1-4)
In the hard coat films obtained in Examples 1 to 4, the first polyester resin having a glass transition temperature of 80 to 130 ° C, the second polyester resin having a glass transition temperature of 0 to 80 ° C, and inorganic fine particles including. The second polyester resin contains 10 to 50 mol% of triethylene glycol as a diol component with respect to the diol component. For this reason, initial adhesion and adhesion after wet heat aging are excellent. In particular, in Examples 1 to 3, since the number average molecular weight of the second polyester resin is in the range of 15,000 to 40,000, the hard coat layer does not peel at all even after wet heat aging, and the adhesion is particularly excellent. ing.
Further, in Examples 1 to 4, no interference unevenness was confirmed, and a good hard coat film was obtained.

(Comparative Examples 1-3)
In Comparative Example 1, polyester resin Y-5 not containing triethylene glycol is used as the second polyester resin. For this reason, in Comparative Example 1, the initial adhesion and the adhesion after wet heat aging are remarkably poor.
Comparative Example 2 does not use the first polyester resin having a glass transition temperature of 80 to 130 ° C. For this reason, interference unevenness has occurred and is not suitable as a hard coat film.
In Comparative Example 3, two types of polyester resins are used, but the first polyester resin has a glass transition temperature of 69 ° C. instead of a glass transition temperature of 80 to 130 ° C. For this reason, interference unevenness has occurred and is not suitable as a hard coat film.

  According to the present invention, it is possible to obtain a laminated film capable of suppressing the occurrence of uneven interference and exhibiting high adhesion. In addition, in the hard coat film, the occurrence of uneven interference can be suppressed and high adhesion between the laminated film and the hard coat layer can be obtained, so that a high quality and highly durable hard coat film can be obtained. . For this reason, the hard coat film of this invention is used especially suitably for a touch panel, and its industrial applicability is high.

DESCRIPTION OF SYMBOLS 1 Support body 2 Laminated film 3 Laminated film 4 Hard coat layer 5 Hard coat film

Claims (8)

A laminated film comprising a support comprising a polyester film and a laminated film laminated on at least one surface of the support,
The laminated film includes a first polyester resin having a glass transition temperature of 80 to 130 ° C., a second polyester resin having a glass transition temperature of 0 to 80 ° C., and inorganic fine particles,
The second polyester resin contains triethylene glycol as a diol component, and the content of the triethylene glycol is 10 to 50 mol% with respect to the total diol component of the second polyester resin.   The laminated film according to claim 1, wherein the second polyester resin contains naphthalenedicarboxylic acid or fluorenedicarboxylic acid as an acid component.   The laminated film according to claim 2, wherein the refractive index of the first polyester resin is 1.6 or more.   4. The laminated film according to claim 1, wherein the content of the inorganic fine particles is 40 to 80% by mass with respect to the laminated film.   The laminated film according to any one of claims 1 to 4, wherein the inorganic fine particles are inorganic oxide fine particles.   The number average molecular weight of said 2nd polyester resin is 15000-40000, The laminated | multilayer film of any one of Claims 1-5 characterized by the above-mentioned.   A hard coat film, further comprising a hard coat layer on the surface of the laminated film of the laminated film according to claim 1. A touch panel comprising the hard coat film according to claim 7 and a transparent electrode layer.

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