Laminated polyester film and paint composition

Abstract

The laminated polyester film of the present invention is a laminated polyester film having a polyester film and a resin layer (X), and has a resin layer (X) on at least one side surface layer, and the surface resistivity value (RX) of the resin layer (X) is 106Ω / □ or higher and 1012Ω / □ or lower, and the ratio RY / RX of the surface resistivity value (RY) of the resin layer (X) after abrasion treatment of the surface of the resin layer (X) under the following conditions is 5.0 or lower. In addition, the laminated polyester film of the present invention is a laminated polyester film having a polyester film and a resin layer (X), and has a resin layer (X) on at least one side surface layer, wherein the resin layer (X) has a resin component (A), polystyrene sulfonic acid and / or its salt (B), and a polyhydric alcohol (C), and the glass transition temperature of the resin component (A) is 40°C or higher and 120°C or lower. The laminated polyester film of the present invention has excellent antistatic properties, and the antistatic properties are difficult to deteriorate due to wear during transport in the processing process or surface treatments such as corona discharge treatment. The laminated polyester film of the present invention can be used as a protective film used in electronic components, etc., and is particularly suitable for use as a cover tape.

Description

Technology Field

[0001] The present invention relates to a laminated polyester film having a polyester film and a resin layer, and a paint composition. Background Technology

[0002] Thermoplastic resin films, especially biaxially oriented polyester films, are widely used in many applications such as magnetic recording materials and packaging materials because they possess excellent properties in mechanical properties, electrical properties, dimensional stability, transparency, and chemical resistance.

[0003] However, since polyester is generally an insulating resin, biaxially oriented polyester films have the drawback of not possessing antistatic properties in that state. Antistatic properties are characteristics imparted for the purpose of suppressing foreign matter defects caused by dust adhesion due to static electricity, and can be imparted by neutralizing the imbalance of charges by imparting conductivity to the surface or inner layer of insulating materials, such as biaxially oriented polyester films, for example. Among these, the method of imparting antistatic properties by providing a conductive coating layer on the surface of a polyester film is easy to maintain various stability characteristics of the film, and has been investigated in various ways since the past.

[0004] Conventional methods for imparting antistatic properties include a method of applying a styrene sulfonic acid copolymer, which is an ion-conducting type antistatic agent, to a polyester resin (e.g., see Patent Document 1), and a technology based on the dispersibility of the styrene sulfonic acid copolymer and the acrylic resin for the purpose of further enhancing functionality (Patent Document 2). Meanwhile, a method has been proposed to achieve both transparency of the coating film and antistatic properties by combining an epoxy crosslinking agent with a polythiophene-based conductive agent, which is an electron-conducting type antistatic agent (Patent Document 3). Furthermore, a technology combining a polythiophene-based conductive agent with a hydroxyl group-containing compound for the purpose of improving antistatic properties (Patent Document 4), and a technology using a polythiophene-based conductive agent to impart durability against magnetic field resistance tests (Patent Document 5) have been proposed.

[0005] The antistatic method of Patent Document 1, which uses an ion-conducting type antistatic agent, or Patent Document 2, which is an improvement thereof, has insufficient antistatic properties and is prone to losing performance due to wear.

[0006] Meanwhile, the method described in Patent Document 3, and the technology of Patent Documents 4 and 5 which are improvements thereof, had problems such as insufficient antistatic properties during corona discharge treatment described later, particularly noticeable in that the antistatic component was a deep color, and also affected the characteristics in terms of quality control.

[0007] In addition, the combined use of the “acrylic resin” of Patent Document 2 or the “hydroxyl group-containing compound having three or more hydroxyl groups” of Patent Document 4 is recognized as having an effect of improving the initial antistatic properties, but it is insufficient for suppressing the deterioration of antistatic properties described later.

[0008] Applications for which biaxially oriented polyester films with antistatic properties are used include protective films used in electronic components, etc. The main use of protective films is for cover tapes, etc.

[0009] This section specifically addresses the challenges associated with cover tapes for electronic components. When peeling the cover tape from an electronic component, the charging generated during peeling can cause the component to inadvertently pop out, become scattered, or lead to electrical damage due to discharge occurring between the charged tape and the component. When electronic components are packaged using the corresponding cover tape and carrier tape, the components are inspected from the cover tape side. This inspection checks, for example, whether different product types are mixed in, or if there is bending of the IC chip lead terminals or errors in the charging direction. To facilitate these inspections, the transparency of the cover tape had to be high. Cover tapes were typically made by applying an antistatic treatment to highly transparent materials such as transparent polyester or transparent polyolefin films.

[0010] However, in the process of making a cover tape, the antistatic properties were reduced due to friction during the processing process in order to form multiple layers, such as a primer or a sealant, on the conductive polyester film that is the substrate. In addition, as exemplified in Patent Document 6, surface treatments such as electrical discharge treatment are performed to increase the adhesion between the polyester film of the substrate and the sealant material, but when surface treatments such as electrical discharge treatment are performed to increase the adhesion between the polyester film of the substrate and the sealant material, the antistatic performance was reduced. Prior art literature

[0011] Japanese Patent Publication No. Sho 61-204240 Japanese Patent Publication No. 2003-071995 Japanese Patent Publication No. 2004-58648 Japanese Patent Publication No. 2016-047881 Japanese Patent Publication No. 2016-064625 Japanese Patent Publication No. 2010-013135 The problem to be solved

[0012] Therefore, the present invention provides a laminated film suitable for use in protective films, particularly cover tapes, by overcoming the aforementioned defects. means of solving the problem

[0013] To solve the above problem, the present invention has the following configuration.

[0014] (1) A laminated polyester film having a polyester film and a resin layer (X), having a resin layer (X) on at least one side surface layer, and a surface resistivity value (R) of the resin layer (X). X ) is 10 6 Ω / □ or more 10 12 Ω / □ or less, and R X And, the surface resistivity value (R) of the resin layer (X) after abrasion treatment of the surface of the resin layer (X) under the following conditions Y R of ) Y / R X A laminated polyester film having a value of 5.0 or less.

[0015] [Wear Treatment Conditions]

[0016] The surface of the resin layer (X) of the laminated polyester film is abraded 10 times using a nonwoven fabric (nonwoven fabric of Oz acid-based Hyzegaze NT-4, 100% Cupro) with a load of 20 g / cm².

[0017] (2) A laminated polyester film having a polyester film and a resin layer (X), wherein the resin layer (X) has a resin layer (X) on at least one side surface layer, and the resin layer (X) has a resin component (A), polystyrene sulfonic acid and / or its salt (B), and a polyhydric alcohol (C), and the glass transition temperature of the resin component (A) is 40°C or higher and 120°C or lower.

[0018] (3) Cover tape using a laminated polyester film of (1) or (2).

[0019] (4) A method for manufacturing a laminated polyester film as described in (1) or (2), comprising a process of applying a paint composition to at least one side of the polyester film, and then performing a stretching treatment and heat treatment in at least one direction, wherein the paint composition has polystyrene sulfonic acid and / or its salt (B).

[0020] (5) A paint composition having a resin component (A) in an amount of 15% or more and 75% or less of the total solid weight, and a polystyrene sulfonic acid and / or its salt (B) in an amount of 15% or more and 50% or less of the total solid weight. Effects of the invention

[0021] The laminated polyester film of the present invention has excellent antistatic properties, and its antistatic properties are resistant to deterioration due to wear during transport in processing or surface treatments such as corona discharge treatment. The laminated polyester film of the present invention can be used as a protective film for electronic components, and is particularly suitable for use as a cover tape. Specific details for implementing the invention

[0022] Hereinafter, the laminated polyester film of the present invention will be described in detail.

[0023] The laminated polyester film of the present invention is a laminated polyester film having a polyester film and a resin layer (X), having a resin layer (X) on at least one side surface layer, and the surface resistivity value (R) of the resin layer (X) X ) is 10 6 Ω / □ or more 10 12 Ω / □ or less, and R X And, the surface resistivity value (R) of the resin layer (X) after abrasion treatment of the surface of the resin layer (X) under the following conditions Y R of ) Y / R XThe value of is 5.0 or less. The abrasion treatment referred to here means abrading the surface of the resin layer (X) of the laminated polyester film 10 times using a nonwoven fabric (Oz Sankyo-ze Hi-ze-ze NT-4) with a load of 20 g / cm².

[0024] Surface resistivity (R) of the resin layer (X) X ) is, 10 6 Ω / □ or more 10 12 If Ω / □ or less, it can be a laminated polyester film with high antistatic performance. In addition, the ratio R of the surface resistivity values ​​before and after the above-mentioned abrasion treatment Y / R X If the value of is 5.0 or less, the degradation of antistatic performance due to wear during transport can be suppressed. Meanwhile, R Y / R X If the value of exceeds 5.0, the antistatic properties gradually deteriorate, causing problems in actual use.

[0025] Furthermore, when laminated polyester film is used for cover tape applications, the antistatic properties are degraded due to friction during the processing steps for forming multiple layers, such as primers or sealants, in the cover tape manufacturing process. Here, R Y / R X A method to reduce the value of can be adjusted by combining material types and preparation conditions, such as, for example, adjusting the amount of crosslinking component in the paint composition forming the resin layer (X), controlling the dispersion state of the conductive component by controlling the mixing ratio of the conductive material and the crosslinking component, the material type, and drying and stretching, or by adjusting the coating thickness and surface shape. The surface resistivity value (R) of the resin layer (X) X ) is 1.5×10 6 Ω / □ or greater than 5.0×10 9 It is desirable that it be Ω / □ or less. In addition, R Y / R XIt is preferable that it be 4.5 or less, more preferable that it be 3.0 or less, and more preferable that it be 1.0 or more and 2.0 or less.

[0026] In addition, the laminated polyester film of the present invention has a surface resistivity value (R X Surface resistivity value (R) of the resin layer (X) after corona discharge treatment on the surface opposite to the surface having the resin layer (X) and ) Z R ratio of ) Z / R X It is desirable that is 10.0 or less. Ratio R Z / R X If α exceeds 10.0, it may be difficult to achieve both adhesion and antistatic properties between the polyester film and various functional layers. Here, corona discharge treatment refers to installing a laminated polyester film on a grounding plate such that the resin layer (X) faces upward, and performing corona discharge treatment on the surface opposite to the surface having the resin layer (X) with a corona discharge treatment output of 100W, a discharge gap with the ceramic electrode of 1mm, an electrode movement speed of 1m / min, and one treatment cycle. Corona discharge treatment can be performed, for example, using the TEC-4AX corona surface modification evaluation device manufactured by Gas Denki Inc. R Z / R X A method for reducing the value of can be adjusted by, for example, selecting an appropriate conductive material species as a conductive material species to be contained in the resin layer (X), controlling the mixing ratio of the crosslinking component in the paint composition forming the resin layer (X), controlling the dispersion state of the conductive component by controlling drying and stretching, and controlling the coating thickness or the state of localization in the thickness direction. Surface resistivity value (R X Surface resistivity value (R) of the resin layer (X) after corona discharge treatment on the surface opposite to the surface having the resin layer (X) and ) Z R ratio of ) Z / R XIt is more desirable that it be 5.0 or less, more desirable that it be 3.0 or less, and particularly desirable that it be 1.0 or more and 2.0 or less.

[0027] In the resin layer (X) of the laminated polyester film of the present invention, it is preferable that the average surface roughness Ra measured in a 1 μm area is 3 nm or more and 10 nm or less. If Ra is not satisfied with 3 nm, the slipperiness of the resin layer (X) is insufficient, and due to this lack of slipperiness, wear on the surface of the resin layer (X) is accelerated, which may lead to a decrease in antistatic properties. On the other hand, if it exceeds 10 nm, transparency may decrease. Methods for controlling the average surface centerline roughness Ra of the resin layer (X) include, for example, adding particle materials to the resin layer (X), adding particles to the polyester substrate, or imparting a shape to the surface by controlling the drying and stretching of the resin layer. In terms of maintaining the wearability of the coating film, the method of controlling the average surface centerline roughness Ra of the resin layer (X) is preferably the method of adding particles to the polyester substrate or the method of imparting a shape to the surface by controlling the drying and stretching of the resin layer.

[0028] In addition, it is preferable that the coefficient of dynamic friction between the surface of the resin layer (X) of the laminated polyester film of the present invention and the opposite surface thereof is 0.5 or less. If the coefficient of dynamic friction exceeds 0.5, the slipperiness is insufficient, and the antistatic properties may easily deteriorate. Furthermore, although there is no specific limitation regarding the lower limit, a realistic measurement lower limit is approximately 0.01. Details of the method for measuring the coefficient of dynamic friction will be described later. It is more preferable that the coefficient of dynamic friction between the surface of the resin layer (X) of the laminated polyester film of the present invention and the opposite surface thereof is 0.05 or more and 0.4 or less.

[0029] The resin layer (X) of the laminated polyester film of the present invention preferably has a resin component (A).

[0030] The resin used as the resin component (A) preferably has a glass transition temperature (Tg) of 40°C or higher and 120°C or lower, more preferably 60°C or higher and 120°C or lower, and particularly preferably 70°C or higher and 120°C or lower. By setting the glass transition temperature (Tg) of the resin component (A) to 40°C or higher and 120°C or lower, it is possible to maintain the hardness of the coating film in an actual usage environment, thereby enabling the ratio R of the surface resistivity value before and after abrasion treatment. Y / R X The value of and the ratio of surface resistivity values ​​before and after corona discharge treatment, Rz / R X It becomes easy to adjust the value of. In addition, when manufactured using the inline coating method of the resin layer (X), the degradation of quality due to cracks, etc. can be eliminated. Furthermore, the method for measuring the glass transition temperature (Tg) will be described later.

[0031] The resin used as the resin component (A) may include acrylic resin, polyester resin, polyurethane resin, melamine resin, and epoxy resin, and one or more types may be used in combination. R is the ratio of surface resistivity values ​​before and after abrasion treatment. Y / R X The value of and the ratio R of the surface resistivity values ​​before and after corona discharge treatment z / R X In terms of adjusting the value, acrylic resin, polyester resin, and polyurethane resin are preferred, and acrylic resin is particularly preferred.

[0032] As an acrylic resin, for example, an acrylic resin emulsion dispersed in water may be used, and its dispersion diameter is preferably 20 to 200 nm, more preferably 30 to 100 nm. If the dispersion diameter of the acrylic resin emulsion dispersed in water is 20 to 200 nm, it is desirable for finely dispersing other resins. In order to make the dispersion diameter less than 20 nm, it is necessary to increase the amount of emulsifier used based on the specific surface area when preparing the acrylic emulsion by emulsion polymerization, etc., which may cause problems with adhesion, etc. If it exceeds 200 nm, fine dispersion may become difficult.

[0033] As monomer components constituting the acrylic resin, although not specifically limited, examples include alkyl acrylates, alkyl methacrylates (alkyl groups including methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, 2-ethylhexyl, lauryl, stearyl, cyclohexyl, phenyl, benzyl, phenylethyl, etc.), hydroxyl group-containing monomers such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, and 2-hydroxypropyl methacrylate, acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, N,N-dimethylolacrylamide, and N-methoxymethylacrylamide. Monomers containing amide groups such as N-methoxymethylmethacrylamide and N-phenylacrylamide, monomers containing amino groups such as N,N-diethylaminoethylacrylate and N,N-diethylaminoethylmethacrylate, monomers containing epoxy groups such as glycidyl acrylate and glycidyl methacrylate, monomers containing carboxyl groups or their salts such as acrylic acid, methacrylic acid and their salts (lithium salt, sodium salt, potassium salt, etc.), etc., may be used, and these are copolymerized using one or more of these. In addition, these may be used in combination with other types of monomers.

[0034] Here, as other types of monomers, for example, monomers containing epoxy groups such as allylglycidyl ether, monomers containing carboxyl groups or their salts such as crotonic acid, itaconic acid, maleic acid, fumaric acid and their salts (lithium salt, sodium salt, potassium salt, ammonium salt, etc.), monomers containing acid anhydrides such as maleic anhydride and itaconic anhydride, vinyl isocyanate, allyl isocyanate, styrene, vinylmethyl ether, vinylethyl ether, vinyltrisalkoxysilane, alkyl maleic acid monoester, alkyl fumaric acid monoester, acrylonitrile, methacrylonitrile, alkyl itaconic acid monoester, vinylidene chloride, vinyl chloride, vinyl acetate, etc. may be used. In addition, modified acrylic copolymers, such as block copolymers modified into polyester, urethane, epoxy, etc., graft copolymers, etc., may also be used.

[0035] Preferred acrylic resins used in the present invention include copolymers selected from methyl methacrylate, ethyl acrylate, n-butyl acrylate, 2-hydroxyethyl acrylate, acrylamide, N-methylolacrylamide, and acrylic acid. In the present invention, the polymerization method of the acrylic resin emulsion is preferably emulsion polymerization, suspension polymerization, etc.

[0036] The polyester resin used as the resin component (A) in the present invention has ester bonds in its main chain or side chain and is obtained by polycondensing a dicarboxylic acid and a diol. As the carboxylic acid component constituting the polyester resin, aromatic, aliphatic, or cycloaliphatic dicarboxylic acids or polycarboxylic acids with three or more valencies may be used.

[0037] As aromatic dicarboxylic acids, terephthalic acid, isophthalic acid, orthophthalic acid, phthalic acid, 2,5-dimethylterephthalic acid, 1,4-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,2-bisphenoxyethane-p,p'-dicarboxylic acid, phenylindanedicarboxylic acid, and ester-forming derivatives thereof may be used. Additionally, as aliphatic and alicyclic dicarboxylic acids, succinic acid, adipic acid, sebacic acid, azelaic acid, dodecanedionic acid, dimer acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and ester-forming derivatives thereof may be used.

[0038] As the glycol component of the polyester resin, ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 2,4-dimethyl-2-ethylhexane-1,3-diol, neopentyl glycol, 2-ethyl-2-butyl-1,3-propanediol, 2-ethyl-2-isobutyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,2,4-trimethyl-1,6-hexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, 4,4'-thiodiphenol, bisphenol A, 4,4'-methylenediphenol, 4,4'-(2-norbornylidene)diphenol, 4,4'-dihydroxybiphenol, o-, m-, and p-dihydroxybenzene, 4,4'-isopropylidenephenol, 4,4'-isopropylidenebindiol, cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane-1,4-diol, etc. may be used.

[0039] In the present invention, the polyester resin used as the resin component (A) is preferably used as an aqueous solution that is dissolved or dispersed in water. To facilitate the water solubility or water oxidation of the polyester resin, it is preferable to copolymerize a compound containing a sulfonic acid base or a compound having a hydrophilic group containing a carboxylic acid base.

[0040] As compounds containing sulfonic acid bases, alkali metal salts, alkaline earth metal salts, and ammonium salts such as sulfoterephthalic acid, 5-sulfoisophthalic acid, 4-sulfoisophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, sulfo-p-xylylene glycol, and 2-sulfo-1,4-bis(hydroxyethoxy)benzene can be used.

[0041] Examples of compounds containing carboxylic acid bases include alkali metal salts, alkaline earth metal salts, ammonium salts, etc., such as trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic anhydride, 4-methylcyclohexene-1,2,3-tricarboxylic acid, trimesic acid, 1,2,3,4-butanetetracarboxylic acid, 1,2,3,4-pentanetetracarboxylic acid, 3,3',4,4'-benzophenonetetracarboxylic acid, cyclopentanetetracarboxylic acid, 2,3,6,7-naphthalenetetracarboxylic acid, 1,2,5,6-naphthalenetetracarboxylic acid, ethylene glycol bistrimellitate, 2,2',3,3'-diphenyltetracarboxylic acid, thiophene-2,3,4,5-tetracarboxylic acid, and ethylenetetracarboxylic acid.

[0042] In the present invention, the polyester resin used as the resin component (A) may be a modified polyester copolymer, such as a block copolymer modified with acrylic, urethane, epoxy, etc., a graft copolymer, etc.

[0043] The polyester resin used as the resin component (A) can be manufactured by methods such as directly esterifying the dicarboxylic acid component and the glycol component, or by polycondensing the reaction product of the ester exchange reaction. At this time, as a reaction catalyst, for example, alkali metals, alkaline earth metals, manganese, cobalt, zinc, antimony, germanium, titanium compounds, etc., can be used.

[0044] The intrinsic viscosity of the polyester resin used as the resin component (A) is preferably 0.3 dl / g or higher in terms of adhesiveness, and more preferably 0.35 dl / g or higher.

[0045] As a polyurethane resin used as the resin component (A) in the present invention, a water-soluble or water-dispersible polyurethane resin having an anionic group is exemplified, but as a main component, the reaction product having a polyol compound and a polyisocyanate compound has a basic structure.

[0046] As polyol compounds, examples include polyethylene glycol, polypropylene glycol, polyethylene-propylene glycol, polytetramethylene glycol, hexamethylene glycol, hexamethylene glycol, tetramethylene glycol, 1,5-pentanediol, diethylene glycol, triethylene glycol, polycaprolactone, polyhexamethylene adipate, polytetramethylene adipate, trimethylolpropane, trimethylolethane, glycerin, acrylic polyols, etc.

[0047] As polyisocyanate compounds, examples include tolylene diisocyanate, hexamethylene diisocyanate, phenylene diisocyanate, diphenylmethane diisocyanate, adducts of tolylene diisocyanate and trimethylolpropane, adducts of hexamethylene diisocyanate and trimethylolethane, etc.

[0048] The main components of the polyurethane resin may include, in addition to polyol compounds and polyisocyanate compounds, chain length extenders or crosslinking agents. As chain extenders or crosslinking agents, ethylene glycol, propylene glycol, butanediol, diethylene glycol, ethylenediamine, diethylenetriamine, etc. may be used.

[0049] As an anionic group in the polyurethane resin used as resin component (A), a carboxylic acid group, a sulfonic acid group or a sulfate half-ester group and their ammonium, lithium, sodium, potassium salts, etc., may be used. Particularly preferably, it is a sulfonic acid and / or sulfonate group.

[0050] The amount of anionic groups in the polyurethane resin used as the resin component (A) is preferably 0.05% to 15% by weight in terms of blocking inhibition.

[0051] Polyurethane resins having anionic groups can be manufactured by using, for example, a method of using a compound having anionic groups in polyols, polyisocyanates, chain extenders, etc., a method of reacting unreacted isocyanate groups of the produced urethane resin with a compound having anionic groups, or a method of reacting active hydrogen groups of the urethane resin with a specific compound.

[0052] A polyurethane resin having an anionic group is preferably a resin comprising a polyol having a molecular weight of 300 to 20,000, a polyisocyanate, a chain length extender having a reactive hydrogen atom, a group that reacts with the isocyanate group, and a compound having at least one anionic group.

[0053] In the present invention, as a more preferred form of the resin component (A), functional groups such as carboxyl groups, hydroxyl groups, methylol groups, and amide groups are introduced into the acrylic resin by copolymerization, for example, and a component capable of crosslinking with these functional groups may be mixed. In this case, by using the specific acrylic resin described above, the reaction efficiency with the crosslinking agent is increased, thereby exhibiting an effect of improving the water resistance and heat resistance of the laminated film. As for the types of crosslinking agents, examples include melamine-based crosslinking agents, oxazoline-based crosslinking agents, isocyanate-based crosslinking agents, epoxy-based crosslinking agents, aziridine-based crosslinking agents, methylolated or alkylolated urea-based, acrylamide-based, or polyamide-based resins, amide-epoxy compounds, various silane coupling agents, various titanate-based coupling agents, etc. In particular, melamine-based crosslinking agents and oxazoline-based crosslinking agents are preferred.

[0054] The resin layer (X) of the present invention preferably comprises polystyrene sulfonic acid and / or a salt thereof. By including polystyrene sulfonic acid and / or a salt thereof, the antistatic properties can be improved.

[0055] In the resin layer (X), if polystyrene sulfonic acid and / or its salt is included, it is preferable to uniformly finely disperse polystyrene sulfonic acid and / or its salt (B) in the matrix of the resin component (A). By uniformly finely dispersing polystyrene sulfonic acid and / or its salt (B) in the matrix of the resin component (A), cracks are less likely to form in the coating film, the coating film is less likely to be scraped, transparency is not reduced, and problems such as blocking due to moisture absorption do not occur.

[0056] A method for uniformly finely dispersing polystyrene sulfonic acid and / or its salt (B) in a matrix of a resin component (A) is as follows:

[0057] 1. A method of approaching solubility parameters of polystyrenesulfonic acid and / or its salt (B) by selecting the molecular structure of the resin component (A),

[0058] 2. A method of adding a third component having a solubility parameter intermediate between that of a resin component (A) and polystyrenesulfonic acid and / or its salt (B).

[0059] Examples include the following. Among these, a preferred method for achieving both antistatic and wear resistance is to add a third component having a solubility parameter intermediate between the resin component (A) of 2 and polystyrene sulfonic acid and / or its salt (B). As the third component, it is possible to use a resin material having a solvent component that volatilizes during the manufacturing process or a reaction site. As the third component, it is particularly preferred that it be a polyhydric alcohol compound (C) described later for achieving both antistatic and wear resistance.

[0060] Here, polystyrenesulfonic acid and / or its salts may include polystyrene sulfonated and, after sulfonation, neutralized with a hydroxide of a monovalent alkali metal or alkaline earth metal, such as potassium, sodium, or lithium, to form a metal counterion, neutralized with ammonia to form an ammonium counterion, or an anionic polymer obtained by polymerizing styrenesulfonic acid or styrenesulfonate (as salts, the metal and ammonium mentioned above). While it is preferable to use this polystyrenesulfonic acid and / or its salts as homopolymers to exhibit an antistatic function, they may also be copolymerized with various monomers listed as constituent monomers of the resin component (A).

[0061] In the laminated polyester film of the present invention, the resin layer (X) preferably has a polyhydric alcohol compound (C). By containing the polyhydric alcohol compound (C), the durability of the antistatic properties can be improved.

[0062] The polyhydric alcohol compound (C) in the present invention is a compound having three or more hydroxyl groups, such as pentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, neopentyl glycol, trimethylolpropane, ditrimethylolpropane, 1,3,5-tris(2-hydroxyethyl)isocyanurate (THEIC), polyethylene glycol, glycerin, diglycerin, mannitol, maltitol, lactitol, sorbitol, erythritol, xylitol, xylose, sucrose, trehalose, inositol, fructose, maltose, lactose, etc. This polyhydric alcohol compound (C) is not a polymer.

[0063] A particularly preferred polyalcohol compound (C) is a sugar alcohol compound, and examples include sorbitol (boiling point 296°C), xylitol (melting point 216°C), erythritol (melting point 329 to 331°C), mannitol (melting point 290 to 295°C), etc. One type of polyalcohol compound (C) may be used alone, or two or more types may be used in combination.

[0064] The polyhydric alcohol compound (C) preferably has a boiling point of 200°C or higher, more preferably 220°C or higher, even more preferably 240°C or higher, and preferably 500°C or lower as an upper limit. If the boiling point of the polyhydric alcohol compound (C) is 200°C or higher, the antistatic properties of the antistatic layer are higher. Meanwhile, the melting point of the polyhydric alcohol compound (C) is preferably 20°C or higher. The boiling point of the hydroxyl group-containing compound can be determined by differential scanning thermal analysis (DSC).

[0065] The polyhydric alcohol compound (C) has a solubility parameter (SP value) of 35 [MPa] 1 / 2 ] or more 50[MPa] 1 / 2It is preferable that it be ] or less. If the SP value does not satisfy 35, or exceeds 50, compatibility with the resin component (A) or polystyrenesulfonic acid and / or its salt (B) becomes difficult, making it prone to abnormal aggregation, and consequently, the ratio R of the surface resistivity values ​​before and after abrasion treatment Y / R X The value of and the ratio R of the surface resistivity values ​​before and after corona discharge treatment z / R X There are cases where the value of is likely to exceed the desirable range.

[0066] The values ​​of solubility parameters are listed, for example, in the "Polymer Handbook (fourth Edition)" by J. BRANDRUP et al. (JOHN WILEY & SONS). On the other hand, if the solubility parameter values ​​are not listed in the database, the solubility for a solvent with known parameter values ​​can be determined by the method shown in the example, based on the property that solubility parameters with similar values ​​are easily soluble in each other, and can be calculated as a three-component vector length using Hansen Solubility Parameter in Practice (HSPiP) ver. 3.1.03 (http: / / www.hansen-solubility.com / index.php).

[0067] The polyalcohol compound (C) satisfies (i) and (ii) below

[0068] (i) Solubility parameter (SP value) is 35 [MPa] 1 / 2 ] or more 50[MPa] 1 / 2 ] That is less than or equal to.

[0069] (ii) Those with a boiling point of 200°C or higher.

[0070] It is particularly desirable to have sugar alcohols.

[0071] In addition, another laminated polyester film of the present invention is a laminated polyester film having a polyester film and a resin layer (X), having a resin layer (X) on at least one side surface layer, wherein the resin layer (X) has a resin component (A), polystyrene sulfonic acid and / or its salt (B), and a polyhydric alcohol (C), and the glass transition temperature of the resin component (A) is 40°C or higher and 120°C or lower.

[0072] Another laminated polyester film of the present invention is preferably a laminated polyester film in which a resin component (A) comprises at least one selected from acrylic resin, polyester resin, polyurethane resin, melamine resin, and epoxy resin.

[0073] Another laminated polyester film of the present invention has a glass transition temperature of a resin component (A) of 40°C or higher and 120°C or lower. The glass transition temperature (Tg) of the resin component (A) is preferably 60°C or higher and 120°C or lower, and particularly preferably 70°C or higher and 120°C or lower.

[0074] Another laminated polyester film of the present invention contains polystyrene sulfonic acid and / or its salt (B). It is preferable to uniformly finely disperse the polystyrene sulfonic acid and / or its salt (B) in the matrix of the resin component (A).

[0075] Another laminated polyester film of the present invention contains a polyhydric alcohol (C). In the present invention, the polyhydric alcohol compound (C) is a compound having three or more hydroxyl groups, and a particularly preferred polyhydric alcohol compound (C) is a sugar alcohol compound. The polyhydric alcohol compound (C) preferably has a boiling point of 200°C or higher, more preferably 220°C or higher, and even more preferably 240°C or higher. The polyhydric alcohol compound (C) has a solubility parameter (SP value) of 35 [MPa 1 / 2 ] or more 50[MPa] 1 / 2It is desirable that it be ] or less.

[0076] In addition, in the laminated polyester film of the present invention, the resin layer (X) preferably has a compound (D) having an ethylene oxide group. By including such a component, the slipperiness of the resin layer (X) can be improved, thereby improving the durability of the antistatic properties.

[0077] In the present invention, the compound (D) having an ethylene oxide group represents a compound having a structure expressed by formula (1).

[0078]

[0079] (Here, k represents an integer greater than or equal to 3).

[0080] Examples of compounds (D) having ethylene oxide groups include polyoxyethylene-polyoxypropylene block copolymers, polyethylene glycol, etc. You may use commercially available products, specifically Pluronic(R) PE3100, PE3500, PE4300, PE6100, PE6120, PE6200, PE6400, PE6800, PE7400, PE8100, PE9200, PE9400, PE10100, PE10300, PE10400, PE10500 (all manufactured by BAF Japan Co., Ltd.), Adeka(R) "Pluronic (registered trademark)" L-23, L-31, L-33, L-34, L-35, F-38, L-42, L-43, L-44, L-61, L-62, L-64, P-65, F-68, L-71, L-72, P-75, P-77, L-81, P-84, P-85, F-88, L-92, P-94, F-98, L-101, P-103, P-104, P-105, F-108, L-121, L-122, P-123, F-127 (all manufactured by ADEKA Inc.), Newpol PE-34, PE-61, PE-62, PE-64, PE-68, PE-71, PE-74, PE-75, PE-78, PE-108, PE-128 (all manufactured by Sanyo Kasei High School Co., Ltd.), etc. can be used.

[0081] The weight average molecular weight of the compound (D) having an ethylene oxide group is preferably 1,000 or more and 20,000 or less. More preferably, it is 2,000 or more and 16,000 or less, even more preferably 6,000 or more and 16,000 or less, and particularly preferably 11,000 or more and 16,000 or less. By making the weight average molecular weight 1,000 or more and 20,000 or less, the dispersion stability of the resin component (A) and polystyrene sulfonic acid and / or its salt (B) is improved, thereby suppressing the deterioration of antistatic properties caused by wear of the resin layer.

[0082] In the present invention, the weight average molecular weight of a compound (D) having an ethylene oxide group is obtained by measuring using gel permeation chromatography (GPC) in the method described below. Specifically, under the following measurement conditions, it is calculated as the weight average molecular weight equivalent to standard polymethyl methacrylate.

[0083] Device: GPC device (HLC-8220) manufactured by Doso Co., Ltd.

[0084] Column: TSK GEL SuperH1000, TSK GEL SuperH2000,

[0085] TSK GEL SuperH3000 (All manufactured by Doso Co., Ltd.)

[0086] Solvent: Water / Ethanol

[0087] Flow rate: 0.5 mL / min

[0088] Sample concentration: 1 mg / mL

[0089] Injection volume: 0.1mL.

[0090] In the laminated polyester film of the present invention, the thickness of the resin layer (X) is preferably 10 to 100 nm. More preferably, it is 15 nm or more and 80 nm or less, and even more preferably, 20 nm or more and 70 nm or less. By making the thickness of the resin layer 10 nm or more and 100 nm or less, it becomes possible to sufficiently express initial antistatic properties and resistance to degradation while maintaining excellent transparency.

[0091] The laminated polyester film of the present invention is preferably a layer in which the resin layer (X) is formed from a paint composition comprising a resin component (A) and polystyrene sulfonic acid and / or its salt (B).

[0092] In the laminated polyester film of the present invention, an intermediate layer may be provided between the resin layer (X) and the polyester film. When an intermediate layer is formed, scratches may occur on the film during the winding of the film laminated with the intermediate layer or during the subsequent process until the resin layer (X) of the present invention is provided. Therefore, in the laminated polyester film of the present invention, it is preferable that the resin layer (X) and the polyester film are directly laminated.

[0093] The laminated polyester film of the present invention preferably has a haze of 5.0% or less. By making the haze 5.0% or less, it can be preferably used as a protective film or a cover tape. More preferably, it is 4.0% or less, and even more preferably, 3.0% or less.

[0094] The laminated polyester film of the present invention is a laminated polyester film having a polyester film and a resin layer (X). The polyester film may be a single-layer film or a laminated film. In the present invention, the polyester film refers to a component in which polyester accounts for 50% or more by weight with respect to the total resin constituting the film.

[0095] Hereinafter, the polyester used in the laminated polyester film of the present invention will be described. First, polyester is a general term for a polymer having ester bonds in its main chain, and it is preferable to use at least one component selected from ethylene terephthalate, propylene terephthalate, ethylene-2,6-naphthalate, butylene terephthalate, propylene-2,6-naphthalate, ethylene-α,β-bis(2-chlorophenoxy)ethane-4,4'-dicarboxylate, etc.

[0096] A polyester film made of polyester is preferably a biaxially oriented polyester film. A biaxially oriented polyester film generally refers to a polyester sheet or film in an unoriented state that is stretched by about 2.5 to 5.0 times in the length direction and in the width direction perpendicular to the length direction, respectively, and then subjected to heat treatment to complete crystal orientation, and exhibits a biaxial orientation pattern in wide-angle X-ray diffraction. When the polyester film is biaxially oriented, thermal stability, particularly dimensional stability and mechanical strength, is sufficient, and flatness is also good.

[0097] Various additives, such as antioxidants, heat stabilizers, weather stabilizers, UV absorbers, organic lubricants, pigments, dyes, organic or inorganic fine particles, fillers, antistatic agents, nucleating agents, etc., may be added to the polyester film in an amount that does not deteriorate the properties of the polyester film.

[0098] In the present invention, it is preferable that the polyester film contains particles. Representative particle types may include silica, colloidal silica, alumina, alumina sol, kaolin, talc, mica, calcium carbonate, etc. Regarding particle type and particle size, a single material or a combination of multiple materials may be used. In the case of a composite film produced by the following co-extrusion, it is particularly preferable that the particles be contained in at least the surface layer. The particle content is preferably such that the total amount is 0.1 weight% or less relative to the entire polyester film. By keeping the particle content within the above range, the internal haze can be reduced to 0.2% or less, and a film with excellent transparency can be produced.

[0099] The thickness of the polyester film is appropriately selected depending on the application or type, but in terms of mechanical strength, handling properties, etc., it is typically preferably 5 to 500 μm, more preferably 6 to 250 μm, and most preferably 7 to 150 μm. In addition, the polyester film may be a composite film produced by co-extrusion, or a film obtained by bonding the film by various methods.

[0100] The laminated polyester film of the present invention is preferably obtained by applying a paint composition comprising a resin component (A), polystyrene sulfonic acid and / or its salt (B), and, if necessary, a polyhydric alcohol compound (C) or a compound having an ethylene oxide group (D) onto a polyester film, and, if the paint composition contains a solvent, by drying the solvent to form a resin layer (X) on the polyester film.

[0101] The laminated polyester film of the present invention is preferably used in a cover tape.

[0102] The cover tape of the present invention is a laminated polyester film having a polyester film and a resin layer (X), having a resin layer (X) on at least one side surface layer, and the surface resistivity value (R) of the resin layer (X)X ) is 10 6 Ω / □ or more 10 12 Ω / □ or less, and R X And, the surface resistivity value (R) of the resin layer (X) after abrasion treatment of the surface of the resin layer (X) under the following conditions Y R of ) Y / R X A laminated polyester film with a value of 5.0 or less is used.

[0103] The cover tape of the present invention is a laminated polyester film having a polyester film and a resin layer (X), and has a resin layer (X) on at least one side surface layer, wherein the resin layer (X) has a resin component (A), polystyrene sulfonic acid and / or its salt (B), and a polyhydric alcohol (C), and the glass transition temperature of the resin component (A) is 40°C or higher and 120°C or lower.

[0104] The method for manufacturing the laminated polyester film of the present invention is described below with examples.

[0105] The method for manufacturing a laminated polyester film of the present invention comprises a process of applying a paint composition to at least one side of a polyester film, and then performing a stretching treatment and a heat treatment in at least one direction, wherein the paint composition has polystyrenesulfonic acid and / or its salt (B).

[0106] The method for manufacturing a laminated polyester film of the present invention is described by taking the case where a polyethylene terephthalate (hereinafter PET) film is used as the polyester film as an example. First, PET pellets are sufficiently vacuum dried, then fed into an extruder, melt-extruded into a sheet shape at about 280°C, and cooled and solidified to produce an unoriented (unoriented) PET film (Film A). This film is stretched 2.5 to 5.0 times in the longitudinal direction by a roll heated to 80 to 120°C to obtain a uniaxially oriented PET film (Film B). A paint composition prepared at a predetermined concentration is applied to one side of this Film B.

[0107] The method of applying the paint composition to the polyester film is preferably an inline coating method. An inline coating method is a method of applying the coating within the manufacturing process of the polyester film. Specifically, it refers to a method of applying the coating at any stage from melt extrusion of the polyester resin, biaxial stretching, heat treatment, and winding up. Typically, the coating is applied to any of the films: a substantially amorphous unoriented (unoriented) polyester film (Film A) obtained by melt extrusion and rapid cooling, a uniaxially stretched (uniaxially oriented) polyester film (Film B) that is stretched in the longitudinal direction, or a biaxially stretched (biaxially oriented) polyester film (Film C) that is further stretched in the width direction before heat treatment.

[0108] In the method for manufacturing a laminated polyester film according to the present invention, it is preferable to adopt a method in which a paint composition is applied to either of the polyester films A and B before crystal orientation is completed, and then the polyester film is stretched in a uniaxial or biaxial direction, and heat treatment is performed at a temperature higher than the boiling point of the solvent to complete the crystal orientation of the polyester film and simultaneously provide a resin layer (X). According to this method, since the formation of the polyester film and the drying of the paint composition (i.e., the formation of the resin layer (X)) can be performed simultaneously, there is an advantage in terms of manufacturing cost. By including a polyhydric alcohol compound (C) in the coating composition, aggregation is suppressed, making it easier to obtain a stretched film of good quality.

[0109] Among these, a method of applying a paint composition to a polyester film (film B) that is uniaxially stretched in the longitudinal direction, and then stretching it in the width direction and heat treating it is preferred. This is because, compared to a method of applying to an unoriented film and then biaxially stretching, the stretching process is reduced by one step, making it difficult for defects or cracks to occur in the composition layer due to stretching, and allowing for the formation of a composition layer with excellent transparency, smoothness, and antistatic properties.

[0110] The method for manufacturing a laminated polyester film of the present invention preferably comprises a process of applying a paint composition as a resin layer (X) to at least one side of a polyester film, and then performing stretching treatment and heat treatment in at least one direction.

[0111] In the present invention, the resin layer (X) is preferably prepared by an inline coating method. Here, any known coating method, such as bar coating, reverse coating, gravure coating, die coating, or blade coating, can be used for the coating method of the paint composition on the polyester film.

[0112] In the present invention, the best method for forming a resin layer (X) is to form it by applying a paint composition using an aqueous solvent onto a polyester film using an inline coating method, and then drying and heat treating. More preferably, the method is to inline coat the paint composition onto a B film after uniaxial stretching. In the method for manufacturing a laminated polyester film of the present invention, drying can preferably be performed in a temperature range of 80 to 130°C to complete the removal of the solvent from the paint composition. Additionally, heat treatment can be performed in a temperature range of 160 to 240°C to complete the formation of the resin layer (X) by completing the thermal curing of the paint composition while completing the crystal orientation of the polyester film.

[0113] By preparing a resin layer (X) by an inline coating method, the arrangement of polystyrene sulfonic acid and / or its salt (B) is promoted by performing a stretching treatment after applying a paint composition, thereby obtaining excellent antistatic performance, and at the same time, by continuing high-temperature heat treatment, the stability of the antistatic performance against wear or surface treatment can be improved.

[0114] In the method for manufacturing a laminated polyester film of the present invention, a surface treatment such as corona discharge treatment may be performed on the coating surface of the PET film before coating. By performing a surface treatment such as corona discharge treatment, the wettability of the paint composition with respect to the PET film is improved, thereby preventing cratering of the paint composition and forming a resin layer (X) with a uniform coating thickness. After coating, it is preferable to hold the end of the PET film with a clip and guide it to a heat treatment zone (preheating zone) at 80 to 130°C to dry the solvent of the paint composition. After drying, it is preferable to stretch it 1.1 to 5.0 times in the width direction. It is then preferable to guide it to a heat treatment zone (heat fixing zone) at 160 to 240°C and perform a heat treatment for 1 to 30 seconds to complete crystal orientation.

[0115] In this heat treatment process (heat setting process), a relaxation treatment of 3 to 15% in the width direction or length direction may be performed as needed. The laminated polyester film obtained in this way becomes a film with excellent transparency, antistatic properties, and durability of antistatic properties.

[0116] The paint composition of the present invention is described.

[0117] The paint composition of the present invention comprises a resin component (A) in an amount of 15% by weight or more and 75% by weight or less based on the total solid weight, and polystyrene sulfonic acid and / or its salt (B) in an amount of 15% by weight or more and 50% by weight or less based on the total solid weight. If the resin component (A) is less than 15% by weight, the film-forming properties of the coating film are insufficient, and not only is durability of antistatic performance against wear not obtained, but the resin layer (X) is prone to detaching from the polyester film. On the other hand, if it exceeds 75% by weight, the antistatic properties are insufficient.

[0118] In the paint composition of the present invention, polystyrene sulfonic acid and / or its salt (B) is contained in a ratio of 15% by weight or more and 50% by weight or less with respect to the total solid weight of the paint composition. If it is less than 15% by weight, the antistatic properties are insufficient. On the other hand, if it exceeds 50% by weight, the transparency of the paint film is impaired, and the quality is degraded due to cracking or cutting of the film.

[0119] In the paint composition of the present invention, the resin component (A) is preferably a resin selected from acrylic resin, polyester resin, polyurethane resin, melamine resin, and epoxy resin.

[0120] The paint composition of the present invention has a glass transition temperature of a resin component (A) of 40°C or higher and 120°C or lower. The glass transition temperature (Tg) of the resin component (A) is preferably 60°C or higher and 120°C or lower, and particularly preferably 70°C or higher and 120°C or lower.

[0121] The resin component (A) contained in the paint composition of the present invention is preferably an emulsion dispersed in a water-soluble solvent.

[0122] The paint composition of the present invention preferably has a polyhydric alcohol compound (C). In the paint composition, the polyhydric alcohol compound (C) is preferably contained in a ratio of 5% by weight or more and 20% by weight or less relative to the total solid content of the paint composition. If the amount is less than 5% by weight, aggregation of the paint composition is likely to occur, and it may be difficult to obtain durability of antistatic performance against wear. On the other hand, if the amount exceeds 20% by weight, in addition to a lack of film-forming ability, blocking may occur.

[0123] The paint composition of the present invention preferably comprises at least one polyhydric alcohol compound (C) selected from sorbitol, xylitol, maltitol, erythritol, mannitol, and lactitol.

[0124] The paint composition of the present invention satisfies (i) and (ii) below, wherein the polyhydric alcohol compound (C) satisfies (i) and (ii).

[0125] (i) Solubility parameter (SP value) is 35 [MPa] 1 / 2 ] or more 50[MPa] 1 / 2 ] That is less than or equal to.

[0126] (ii) Those with a boiling point of 200°C or higher.

[0127] It is desirable to have sugar alcohols.

[0128] In the paint composition of the present invention, when the paint composition contains a solvent, it is preferable to use a water-based solvent (using a water-based coating agent) as the solvent. This is because using a water-based solvent can suppress the rapid evaporation of the solvent during the drying process, thereby enabling the formation of a uniform composition layer, and is also superior in terms of environmental impact.

[0129] Here, an aqueous solvent refers to water, or a mixture of water and organic solvents soluble in water in any proportion, such as alcohols such as methanol, ethanol, isopropyl alcohol, butanol, ketones such as acetone, methyl ethyl ketone, glycols such as ethylene glycol, diethylene glycol, and propylene glycol.

[0130] In the paint composition of the present invention, it is preferable to include a compound (D) having an ethylene oxide group. By having a compound (D) having an ethylene oxide group, it becomes easier to suppress the occurrence of aggregation, and as a result, it becomes easier to suppress the deterioration of antistatic properties due to wear, which is a problem for the resin layer of the present invention. Whether the paint composition includes a compound (D) having an ethylene oxide group can be measured using time-of-flight secondary ion gravimetric analysis (GCIB-TOF-SIMS) under the measurement conditions described below.

[0131] It is preferable that the compound (D) having an ethylene oxide group be contained in a ratio of 2% by weight or more and 20% by weight or less relative to the total solid weight of the paint composition. If it is less than 2% by weight, aggregation is likely to occur, which may result in a decrease in transparency or the quality of the paint film. On the other hand, at 20% by weight, the coating appearance may deteriorate due to foaming.

[0132] In the paint composition of the present invention, it is preferable that the weight average molecular weight of compound (D) is 1,000 or more and 20,000 or less.

[0133] The paint composition of the present invention is preferably a laminated polyester film having a polyester film and a resin layer (X), having a resin layer (X) on at least one side surface layer, and the surface resistivity value (R) of the resin layer (X) X ) is 10 6 Ω / □ or more 10 12 Ω / □ or less, and R XAnd, the surface resistivity value (R) of the resin layer (X) after abrasion treatment of the surface of the resin layer (X) under the following conditions Y R of ) Y / R X A resin layer (X) of a laminated polyester film is formed, wherein the value of is 5.0 or less.

[0134] The paint composition of the present invention preferably forms a laminated polyester film having a polyester film and a resin layer (X), wherein the resin layer (X) has a resin layer (X) on at least one side surface layer, and the resin layer (X) has a resin component (A), polystyrene sulfonic acid and / or its salt (B), and a polyhydric alcohol (C), and the glass transition temperature of the resin component (A) is 40°C or higher and 120°C or lower.

[0135] [Methods for Measuring Characteristics and Evaluating Effects]

[0136] The method for measuring characteristics and evaluating effects in the present invention is as follows.

[0137] (1) Surface resistivity

[0138] Surface resistivity R X Measurements were taken after leaving the sample for 24 hours at 23°C and 65% relative humidity, using a digital ultra-high resistance / micro-ampere R8340A (manufactured by Advantest, Inc.) under that atmosphere, with an applied voltage of 100V for 10 seconds. The unit is Ω / □. The resin lamination surface of the laminated sample was evaluated, and the average value of a total of 10 measurements was used as the sample's surface resistivity value R. X did it.

[0139] (2) Surface resistivity after wear

[0140] Surface resistivity R after wear YThe measurement was carried out in the following procedure. First, the resin layer (X) of the laminated polyester film was fixed to a Hayden Tribo Gear TYPE:38 manufactured by Shinto Kagaku Co., Ltd. with the abrasion surface facing upward. Next, a nonwoven fabric (NT-4 manufactured by Oz Sangyo Hyze) was installed on an ASTM flat indenter. Furthermore, the surface of the resin layer (X) was abraded 10 times under conditions of a travel distance of 100 mm, a travel speed of 2000 mm / min, and a load of 20 g / cm². Subsequently, the aforementioned surface resistivity value R X Measurements were performed in the same manner. The unit is Ω / □. The resin lamination surface of the laminated sample was evaluated, and the average value of a total of 10 measurements was used as the surface resistivity R of the sample after wear. Y He said.

[0141] (3) Surface resistivity after corona discharge treatment

[0142] Surface resistivity R after corona discharge treatment Z The measurement was carried out in the following procedure. First, the laminated polyester film was cut to a size of 10 cm × 20 cm. Next, using the gas-powered Denki Corporation corona surface modification evaluation device TEC-4AX, the laminated polyester film was installed on a ground plate with the resin layer (X) facing upward, and corona discharge treatment was performed under the conditions of a corona discharge treatment output of 100 W, a discharge gap with the ceramic electrode of 1 mm, an electrode movement speed of 0.5 m / min, and one treatment cycle. Subsequently, the aforementioned surface resistivity value R X Measurements were performed in the same manner. The unit is Ω / □. The resin lamination surface of the laminated sample was evaluated, and the average value of a total of 10 measurements was used as the surface resistivity R of the sample after corona discharge treatment. Z did it.

[0143] (4) Centerline average roughness

[0144] Under the following apparatus and conditions, the surface of the resin layer (X) was measured to obtain the centerline average roughness Ra specified in JIS R1683 (2007).

[0145] Measuring device: Atomic force microscope (AFM) manufactured by Burker Corporation

[0146] Measurement Mode: Tapping Mode

[0147] Cantilever: Bruker AXS SCANASYST-AIR

[0148] (Material: Si, Spring constant K: 0.4 (N / m), Tip radius of curvature R: 2 (nm))

[0149] Measurement Atmosphere: 23℃ · Air

[0150] Measurement range: 1 µm square

[0151] Resolution: 512×512

[0152] Specifically, the value of Ra in the Results tab, obtained by analyzing the measured Height Sensor channel data with "Nano Scope Analysis V1.40", performing smoothing by Plane Fit (XY, 3rd), and then processing by Roughness, was called the average surface centerline roughness Ra of the resin layer (X).

[0153] (5) Dynamic friction coefficient

[0154] Based on JIS K7125 (1999), the coefficient of kinetic friction on both sides of a laminated polyester film was measured using a HEIDON-14DR-ANL device (manufactured by Shinto Kagaku Co., Ltd.) with a contact area of ​​4 cm², a load of 1.96 N, and a speed of 100 mm / min. From a chart measured for 4 seconds (data recorded every 2.0 msec), the average value of frictional resistance from 1 second after the start of measurement to the end of measurement was called the kinetic friction force, and divided by the area and weight to be called the coefficient of kinetic friction.

[0155] (6) Hayes

[0156] Haze was measured by leaving the sample for 40 hours under conditions (23°C, relative humidity 50%), using a turbidimeter “NDH5000” manufactured by Nippon Tenshoku Kogyo Co., Ltd., in accordance with JIS K 7136 “Method for determining haze of transparent materials” (2000 edition). Additionally, the measurement was taken by irradiating light from the side of the laminated surface α of the sample. Ten square samples with sides of 50 mm were prepared, and each was measured once, for a total of 10 measurements; the average value of these measurements was defined as the haze value of the sample.

[0157] (7) Film thickness of the resin layer

[0158] The thickness of the resin layer on the polyester film was measured by observing the cross-section using a transmission electron microscope (TEM). The thickness of the resin layer was determined from images taken by the TEM at a magnification of 200,000 times. A total of 10 resin layer thicknesses were measured and the average value was taken.

[0159] (8) Presence or absence of resin component (A), polystyrene sulfonic acid and / or its salt (B) and polyhydric alcohol compound (C)

[0160] The compositional analysis of the resin layer was performed on the surface of the resin layer (X) using an X-ray photoelectron spectroscopy (ESCA), Fourier infrared spectrophotometer (FT-IR) ATR method, and time-of-flight second-order ion gravimetric analysis (TOF-SIMS). In addition, the resin layer (X) was dissolved and extracted with a solvent, separated by chromatography, and then subjected to proton nuclear magnetic resonance spectroscopy ( 1 H-NMR), carbon nuclear magnetic resonance spectroscopy ( 13 The structure was analyzed by 3D NMR and Fourier infrared spectrophotometry (FT-IR), and pyrolysis gas chromatography gravimetric analysis (GC-MS) was performed to investigate the presence of resin components (A), polystyrene sulfonic acid and / or its salts (B), and polyhydric alcohol compounds (C).

[0161] In Tables 5 and 6, if the resin layer contains the structure of a polyhydric alcohol compound (C), it is labeled Y, and if it does not contain it, it is labeled N.

[0162] (9) Glass transition temperature Tg of resin component (A)

[0163] The glass transition temperature (Tg) of resin component (A) was determined using a differential scanning calorimeter (DSC) (manufactured by Hitachi High-Tech Science Co., Ltd.; thermal analyzer DSC / 6220). 3 mg of the sample was weighed into a sample pan, and the sample was heated from 25°C to 200°C at a rate of 20°C / min in the 1st Run, and then rapidly cooled down to 25°C. In addition, in the subsequent 2nd Run, the glass transition temperature was determined from the point where the curve of the step-shaped change portion of the glass transition intersects with a straight line that is equidistant in the vertical direction from the extended straight line of each baseline in the step-shaped change portion of the glass transition. When two or more step-shaped changes in glass transition are observed, the glass transition temperature is calculated for each case, and the average of those temperatures is called the glass transition temperature (Tg) (°C) of the sample.

[0164] (10) Presence or absence of a compound (D) having an ethylene oxide group

[0165] The composition of the surface of the resin layer of the laminated film was analyzed using GCIB-TOF-SIMS (GCIB: Gas Cluster Ion Beam, TOF-SIMS: Time-of-Flight Secondary Ion Gravimetric Analysis). The measurement conditions were as follows.

[0166] <Sputtering Conditions>

[0167] Ion source: Argon gas cluster ion beam

[0168] <Detection Conditions>

[0169] Primary ion: Bi3+ (25 keV)

[0170] Secondary ionic polarity: Negative

[0171] Weight range: m / z 0 to 1000

[0172] Measurement range: 200×200㎛ 2

[0173] Let K be the peak intensity of the fragment detected at maximum intensity, and Q be the peak intensity of the fragment (-(CH2-CH2-O-CH2-CH2-O-CH2-CH2-O-)+-(M / Z=132)) derived from the repeating structure of the ethylene oxide group. If Q / K≥0.02, it was determined that the resin layer contains a compound (D) having an ethylene oxide group. Among the resin layers in Tables 35 and 6, if the compound (D) having an ethylene oxide group is contained, it was designated as Y, and if it is not contained, it was designated as N.

[0174] (11) Weight average molecular weight of compound (D) having an ethylene oxide group

[0175] The weight-average molecular weight of the compound (D) having an ethylene oxide group is obtained by measuring using gel permeation chromatography (GPC). Specifically, under the following measurement conditions, it was calculated as the weight-average molecular weight equivalent to standard polymethyl methacrylate.

[0176] Device: GPC device (HLC-8220) manufactured by Doso Co., Ltd.

[0177] Column: TSK GEL SuperH1000, TSK GEL SuperH2000,

[0178] TSK GEL SuperH3000 (All manufactured by Doso Co., Ltd.)

[0179] Solvent: Water / Ethanol

[0180] Flow rate: 0.5 mL / min

[0181] Sample concentration: 1 mg / mL

[0182] Injection volume: 0.1mL.

[0183] (12) Blocking properties (peelability after blocking test)

[0184] The laminated film was cut into 5 cm squares. The A-layer surface and the B-layer surface of the laminated film were laminated so that they were in contact, and a C-type heatable 60-ton press (manufactured by Konno Hydraulic Press) was applied at 50°C for 5 hours under a load of 150 kgf. Blocking properties were evaluated based on the resistance when the sample was peeled off with tweezers after the two laminated films were overlapped and processed.

[0185] 4: The resistance during peeling is very low.

[0186] 3: There is almost no resistance during peeling, and there is no interlayer delamination in the peeled laminated film.

[0187] 2: There is resistance during peeling, but there is no interlayer delamination in the peeled laminated film.

[0188] 1: Interlayer delamination between layer A and layer B is occurring in at least one of the delaminated laminated films.

[0189] Examples

[0190] Hereinafter, the laminated polyester film of the present invention will be described in detail based on specific embodiments, but the present invention is not limited to these embodiments.

[0191] Initially, resin composition A was adjusted as follows.

[0192] A-1: An emulsion solution of an acrylic resin (emulsion diameter 50 nm) with a Tg of 46°C comprising methyl methacrylate (47 mol%), ethyl acrylate (45 mol%), acrylic acid (2 mol%), N-methylolacrylamide (1 mol%), polyethylene glycol monomethacrylate having 16 repeating units of ethylene oxide (3 mol%), and 2-sulfoethyl acrylate (2 mol%).

[0193] A-2: An emulsion solution of an acrylic resin (emulsion diameter 50 nm) with a Tg of 67°C, comprising methyl methacrylate (66 mol%), ethyl acrylate (30 mol%), acrylic acid (3 mol%), and N-methylolacrylamide (1 mol%).

[0194] Aqueous solutions were prepared for each of the other components as follows. In addition, the mixing ratios of each paint composition are listed in Tables 1 and 2.

[0195] A-3: An emulsion solution of an acrylic resin (emulsion diameter 50 nm) with a Tg of 79°C, comprising methyl methacrylate (76 mol%), ethyl acrylate (20 mol%), acrylic acid (3 mol%), and N-methylolacrylamide (1 mol%).

[0196] A-4: An emulsion solution of an acrylic resin (emulsion diameter 50 nm) with a Tg of 90°C, comprising methyl methacrylate (84 mol%), methyl acrylate (11 mol%), acrylic acid (4 mol%), and N-methylolacrylamide (1 mol%).

[0197] B-1: Aqueous solution of ammonium polystyrene sulfonate (weight-average molecular weight 70,000)

[0198] B-2: To an aqueous solution of 1 wt% iron(III) sulfate containing 20.8 wt% of polystyrene sulfonic acid containing 1887 wt% of peroxodisulfate solution, 49 wt% of iron(III) sulfate solution, 8.8 wt% of 3,4-ethylenedioxythiophene, and 117 wt% of peroxodisulfate solution were added. This mixture was stirred at 18°C ​​for 23 hours. Subsequently, 154 wt% of cation exchange resin and 232 wt% of anion exchange resin were added to this mixture and stirred for 2 hours. Afterward, the ion exchange resin was filtered and fractionated to obtain a water dispersion B-2 (solid content concentration of 1.3 wt%) of a mixture containing poly(3,4-ethylenedioxythiophene) and polystyrene sulfonic acid.

[0199] C-1: Sorbitol (Boiling point: 296℃, SP value: 35.8 MPa) 1 / 2 Aqueous solution of )

[0200] C-2: Xylitol (Boiling point: 216℃, SP value: 36.0 MPa) 1 / 2 Aqueous solution of )

[0201] C-3: Erythritol (Boiling point: 400℃, SP value: 33.8 MPa) 1 / 2 Aqueous solution of )

[0202] C-4: Ethylene glycol (Boiling point: 197°C, SP value: 33.0 MPa) 1 / 2 Aqueous solution of )

[0203] D-1: Aqueous solution of ADEKA® "Pluronic" (registered trademark) F-108 (weight average molecular weight 15,500) manufactured by ADEKA Inc.

[0204] D-2: Aqueous solution of ADEKA® "Pluronic" (registered trademark) F-68 (weight average molecular weight 8350) manufactured by ADEKA Inc.

[0205] D-3: Aqueous solution of ADEKA® “Pluronic” F-88 (weight average molecular weight 10800) manufactured by ADEKA Inc.

[0206] (Example 1)

[0207] Paint Composition

[0208] As a paint composition 1 for forming a resin layer (X), an aqueous dispersion composed of A1 / B1 / C1=60 / 30 / 10 (solid weight ratio) was prepared.

[0209] Laminated Polyester Film

[0210] PET pellets containing 0.005 wt% of colloidal silica with an average particle size of 1.5 μm were sufficiently vacuum dried, fed into an extruder and melted at 285°C, extruded into a sheet shape from a T-shaped die, and then wound onto a mirror-finish casting drum with a surface temperature of 25°C using an electrostatic casting method and cooled to solidify. This unoriented film was heated to 90°C and stretched 3.4 times in the longitudinal direction to form a uniaxially stretched film (film B).

[0211] Next, paint composition 1 was applied to the corona discharge treated surface of a uniaxially stretched film using a bar coat. Both ends of the uniaxially stretched film coated with the paint composition were clipped and guided to a preheating zone, and the atmosphere temperature was set to 75°C. Then, the atmosphere temperature was raised to 110°C using a radiation heater, and then the atmosphere temperature was raised to 90°C to dry the paint composition and form a resin layer (X). Subsequently, the film was stretched 3.5 times in the width direction in a heating zone (stretching zone) at 120°C, and then heat-treated for 20 seconds in a heat treatment zone (heat fixing zone) at 230°C to obtain a laminated polyester film with completed crystal orientation. In the obtained laminated polyester film, the thickness of the PET film measured by observing the cross-section using a transmission electron microscope (TEM) was 20 μm, and the thickness of the resin layer (X) was 60 nm. The characteristics of the obtained laminated polyester film are shown in Tables 3 and 5.

[0212] (Example 2)

[0213] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-2 / B-1 / C-1=60 / 30 / 10 (solid weight ratio) was prepared as paint composition 2 from the conditions described in Example 1.

[0214] (Example 3)

[0215] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-1=75 / 15 / 10 (solid weight ratio) was prepared as paint composition 3 from the conditions described in Example 1.

[0216] (Example 4)

[0217] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-1=50 / 40 / 10 (solid weight ratio) was prepared as paint composition 4 from the conditions described in Example 1.

[0218] (Example 5)

[0219] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1=70 / 30 (solid weight ratio) was prepared as paint composition 5 from the conditions described in Example 1.

[0220] (Example 6)

[0221] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-2 / C-1=60 / 30 / 10 (solid weight ratio) was prepared as paint composition 6 from the conditions described in Example 1.

[0222] (Example 7)

[0223] A laminated polyester film was obtained in the same manner as in Example 1, except that, as a paint composition 7, 20 parts by weight of "Sperica 140" (silica particles, particle diameter 140 nm) manufactured by Kasei Co., Ltd. was added to an aqueous dispersion composed of A-1 / B-1 / C-1 = 70 / 20 / 10 (solid weight ratio), when the total solid weight of A-1 / B-1 / C-1 was 100 parts by weight.

[0224] (Example 8)

[0225] A laminated polyester film was obtained in the same manner as in Example 1, except that a pellet not containing colloidal silica was used as the PET pellet of the laminated polyester film from the conditions described in Example 1.

[0226] (Example 9)

[0227] A laminated polyester film was obtained by the following method using the paint composition described in Example 1. A PET film "Lumimirror T60" manufactured by Toray Corporation (substrate thickness 38 μm) was used as the substrate. The paint composition was applied onto the substrate using a wire bar, and then heated and cured in a hot air oven at 200°C for 1 min. In the obtained laminated polyester film, the thickness of the PET film was 38 μm and the thickness of the resin layer was 80 nm.

[0228] (Example 10)

[0229] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-2=60 / 30 / 10 (solid weight ratio) was prepared as paint composition 8 from the conditions described in Example 1.

[0230] (Example 11)

[0231] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-3=60 / 30 / 10 (solid weight ratio) was prepared as the paint composition 9 from the conditions described in Example 1.

[0232] (Example 12)

[0233] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-4=60 / 30 / 10 (solid weight ratio) was prepared as the paint composition 10 from the conditions described in Example 1.

[0234] (Example 13)

[0235] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-1 / D-1=55 / 30 / 10 / 5 (solid weight ratio) was prepared as the paint composition 11 from the conditions described in Example 1.

[0236] (Example 14)

[0237] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-1 / D-2=55 / 30 / 10 / 5 (solid weight ratio) was prepared as the paint composition 12 from the conditions described in Example 1.

[0238] (Example 15)

[0239] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-1 / D-3=55 / 30 / 10 / 5 (solid weight ratio) was prepared as the paint composition 13 from the conditions described in Example 1.

[0240] (Example 16)

[0241] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-3 / B-1 / C-1=60 / 30 / 10 (solid weight ratio) was prepared as the paint composition 16 from the conditions described in Example 1.

[0242] (Example 17)

[0243] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-4 / B-1 / C-1=60 / 30 / 10 (solid weight ratio) was prepared as the paint composition 17 from the conditions described in Example 1.

[0244] (Example 18)

[0245] A laminated polyester film was obtained in the same manner as in Example 9, except that the thickness of the resin layer was 60 nm.

[0246] (Example 19)

[0247] A laminated polyester film was obtained in the same manner as in Example 1, except that the thickness of the resin layer was 150 nm.

[0248] (Comparative Example 1)

[0249] A laminated polyester film was obtained by the following method using paint composition 5 described in Example 5. A PET film "Lumimirror T60" manufactured by Toray Corporation (substrate thickness 38 μm) was used as the substrate. The paint composition was applied onto the substrate using a wire bar, and then heated and cured in a hot air oven at 200°C for 1 min. In the obtained laminated polyester film, the thickness of the PET film was 38 μm and the thickness of the resin layer was 80 nm.

[0250] (Comparative Example 2)

[0251] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-1=85 / 5 / 10 (solid weight ratio) was prepared as the paint composition 14 from the conditions described in Example 1.

[0252] (Comparative Example 3)

[0253] A laminated polyester film was obtained in the same manner as in Example 1, except that an aqueous dispersion consisting of A-1 / B-1 / C-1=30 / 60 / 10 (solid weight ratio) was prepared as the paint composition 15 from the conditions described in Example 1.

[0254]

[0255]

[0256]

[0257]

[0258]

[0259]

[0260] Also, in the table, E represents the exponent; for example, 1.0E + 0.9 is 1.0 × 10⁻¹⁰ 9 It represents. Industrial applicability

[0261] The laminated polyester film of the present invention is excellent for maintaining antistatic properties, such as during wear or corona discharge treatment. The laminated polyester film of the present invention can be used as various types of tapes, particularly for magnetic recording materials, electrical insulating materials, insulating tapes, electrical materials, protective films, optical, graphic, card, transfer foil, ribbon, deposition, packaging, capacitors, cover tapes, etc.

[0262] The laminated polyester film of the present invention can be preferably used in carrier tapes because it can resolve issues such as dust adhesion due to peeling charge phenomena, electrical destruction of electronic components, and further deterioration of antistatic properties or transparency under harsh environments. In addition, the laminated polyester film of the present invention can be used in protective films because it can resolve issues such as dust adhesion due to peeling charge phenomena, destruction of electronic components of a display due to peeling charge, and deterioration of antistatic properties under harsher environments, which were challenges of protective films.

Claims

Claim 1 A laminated polyester film having a polyester film and a resin layer (X), wherein the resin layer (X) is formed on at least one surface layer, the resin layer (X) has a resin component (A), the glass transition temperature (Tg) of the resin component (A) is 46°C or higher and 120°C or lower, the resin component (A) comprises an acrylic resin, the resin layer (X) further has polystyrenesulfonic acid and / or its salt (B), the amount of polystyrenesulfonic acid and / or its salt (B) in the resin layer (X) is 15% by weight or higher and 50% by weight or lower, and the surface resistivity (R) of the resin layer (X) X ) is 10 6 Ω / □ or more 10 12 Ω / □ or less, and R X And, the surface resistivity value (R) of the resin layer (X) after abrasion treatment of the surface of the resin layer (X) under the abrasion treatment conditions below Y R of ) Y / R X A laminated polyester film having a value of 5.0 or less, a surface centerline average roughness Ra of the resin layer (X) of 3 nm or more and 10 nm or less, and a haze of the laminated polyester film of 2.5% or more and 5.0% or less. [Abrasion treatment conditions] The surface of the resin layer (X) of the laminated polyester film is abraded 10 times using a nonwoven fabric of 100% Cupro with a load of 20 g / ㎠. Claim 2 In claim 1, the surface resistivity value (R) of the laminated polyester film X ) and the surface resistivity value (R) of the resin layer (X) after corona discharge treatment under the following conditions on the surface opposite to the surface having the resin layer (X). Z Ratio of ) Z / R X A laminated polyester film having a value of 10.0 or less. [Corona discharge treatment conditions] The laminated polyester film is installed on a ground plate so that the resin layer (X) faces upward, and corona discharge treatment is performed on the surface opposite to the surface having the resin layer (X) with a corona discharge treatment output of 100W, a discharge gap with the ceramic electrode of 1mm, an electrode movement speed of 0.5m / min, and a treatment cycle of 1 time. Claim 3 A laminated polyester film according to claim 1 or 2, wherein the coefficient of kinetic friction between the surface of the resin layer (X) of the laminated polyester film and the opposite surface is 0.5 or less. Claim 4 A laminated polyester film according to claim 1 or 2, wherein the resin component (A) further comprises at least one selected from polyester resin, polyurethane resin, melamine resin and epoxy resin. Claim 5 A laminated polyester film according to claim 1 or 2, wherein the resin layer (X) has a polyhydric alcohol compound (C). Claim 6 In claim 5, the polyhydric alcohol compound (C) is a sugar alcohol satisfying (i) and (ii) below, a laminated polyester film. (i) Solubility parameter (SP value) is 35 [MPa 1 / 2 ] or more 50[MPa] 1 / 2 ] or less. (ii) A boiling point of 200℃ or higher. Claim 7 A laminated polyester film according to claim 5, wherein the polyhydric alcohol compound (C) comprises at least one selected from sorbitol, xylitol, maltitol, erythritol, mannitol, and lactitol. Claim 8 A laminated polyester film having a polyester film and a resin layer (X), wherein the resin layer (X) has a surface layer on at least one side, the resin layer (X) has a resin component (A), polystyrene sulfonic acid and / or its salt (B), and a polyhydric alcohol (C), the glass transition temperature of the resin component (A) is 46°C or higher and 120°C or lower, the resin component (A) comprises an acrylic resin, the amount of polystyrene sulfonic acid and / or its salt (B) in the resin layer (X) is 15% by weight or higher and 50% by weight or lower, the average surface centerline roughness Ra of the resin layer (X) is 3 nm or higher and 10 nm or lower, and the haze of the laminated polyester film is 2.5% or higher and 5.0% or lower. Claim 9 A laminated polyester film according to claim 8, wherein the resin component (A) further comprises at least one selected from polyester resin, polyurethane resin, melamine resin, and epoxy resin. Claim 10 A laminated polyester film according to any one of claims 1, 2, 8 and 9, wherein the resin layer (X) comprises a compound (D) having an ethylene oxide group. Claim 11 A laminated polyester film according to claim 10, wherein the weight average molecular weight of compound (D) is 1,000 or more and 20,000 or less. Claim 12 A laminated polyester film according to any one of claims 1, 2, 8 and 9, wherein the resin layer (X) is a layer formed by a paint composition comprising a resin component (A) and polystyrene sulfonic acid and / or its salt (B). Claim 13 A laminated polyester film used in a cover tape, in any one of paragraphs 1, 2, 8 and 9. Claim 14 A cover tape using a laminated polyester film as described in any one of paragraphs 1, 2, 8, and 9. Claim 15 A method for manufacturing a laminated polyester film as described in any one of claims 1, 2, 8 and 9, comprising a process of applying a paint composition to at least one side of the polyester film, and then performing a stretching treatment and heat treatment in at least one direction, wherein the paint composition has polystyrenesulfonic acid and / or its salt (B). Claim 16 delete Claim 17 delete Claim 18 delete Claim 19 delete Claim 20 delete Claim 21 delete Claim 22 delete Claim 23 delete Claim 24 delete Claim 25 delete Claim 26 delete Claim 27 delete

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