JP6419548B2 - Surface protective film, method for manufacturing surface protective film, and optical member - Google Patents

Description

  The present invention relates to a surface protective film for a touch panel, a method for producing the surface protective film, and an optical member mounted on the touch panel.

  The surface protective film generally has a configuration in which an adhesive layer is provided on a film-like substrate (support). Such a protective film is bonded to an adherend (protected body) through the pressure-sensitive adhesive layer, and is used for the purpose of protecting the adherend from scratches and dirt during processing and transportation.

  For example, a touch panel of a liquid crystal display is formed by attaching an optical member such as a polarizing plate or a wave plate to a liquid crystal cell via an adhesive layer. In the manufacture of such a liquid crystal display panel, a polarizing plate to be bonded to a liquid crystal cell is once manufactured in a roll form, and then unwound from this roll and cut into a desired size according to the shape of the liquid crystal cell. . Here, in order to prevent the polarizing plate from being rubbed and scratched with a transport roll or the like in an intermediate step, a measure is taken to attach a surface protective film to one side or both sides (typically, one side) of the polarizing plate.

  In general, since the surface protective film and the optical member are made of a plastic material, they have high electrical insulation and generate static electricity due to friction or peeling. For this reason, static electricity tends to be generated even when the surface protective film is peeled off from the optical member such as a polarizing plate, and when voltage is applied to the liquid crystal with this static electricity remaining, the alignment of the liquid crystal molecules is lost, There is also a concern that the panel may be lost. Also, the presence of static electricity can be a factor that attracts dust and reduces workability. Under such circumstances, the surface protection film is subjected to an antistatic treatment. For example, as a surface layer (topcoat layer, back layer) of the surface protection film, an antistatic layer is formed or an antistatic coating is applied. Thus, an antistatic function is provided (see Patent Documents 1 and 2).

  In recent years, PEDOT (poly (3,4-ethylenedioxythiophene) / PSS (polystyrene sulfonate) (polythiophene type) system is used as a conductive polymer used to impart an antistatic function to the surface layer of the surface protective film. However, if the water dispersion type is stored in a solution state, agglomerates are generated, and a uniform antistatic layer cannot be formed. In addition, when an antistatic layer is formed using the conductive polymer, PSS (corresponding to a dopant) is desorbed from PEDOT with the passage of time, and the surface resistance value and peeling band voltage are reduced. An increase or the like may occur, and a problem such as an increase (deterioration) in surface resistance value due to oxidation deterioration or light deterioration may occur.

  On the other hand, in a capacitive touch panel, when the polarizing plate is installed on the viewing side from the touch sensor, the surface of the surface protective film is used when checking the operation of the touch panel with the protective film attached to the polarizing plate. If the surface resistance value of the layer is too low, the touch panel does not react and cannot be inspected, and if the surface resistance value is too high, static electricity is generated and there is a concern that problems may occur.

  In addition, when the surface protective film is no longer required, a layer having another function (other layer) is provided on the adherend surface to which the surface protective film has been attached after being peeled from the optical member. There is. Depending on the condition of the adherend surface after the surface protective film is peeled off, the wettability of the other layer may deteriorate, and other layers may not function as expected or the product may be defective. The case is a concern. Specifically, it is provided to protect the surface of a polarizing plate (for example, a polarizing plate whose surface layer is a hard coat layer) when another layer such as a layer having a touch panel function is installed on the polarizing plate surface. After peeling off the surface protective film, when applying an interlayer filler between another layer and the polarizing plate surface to provide a transparent layer, the wettability of the polarizing plate surface to the interlayer filler is not sufficient There is. Therefore, when providing another layer on the adherend surface after peeling off the surface protective film, development of a surface protective film capable of ensuring a state excellent in wettability is required.

JP 2004-223923 A JP 2008-255332 A

  In view of the above circumstances, the present invention, as a result of earnest research, has excellent antistatic properties and stability over time of the stripping voltage, can be used to confirm the operation of the touch panel, and is deposited after the surface protective film is stripped. It aims at providing the surface protection film for touch panels excellent in the wettability with respect to the interlayer filler in the body surface, the manufacturing method of the said surface protection film, and an optical member.

  That is, the surface protective film for a touch panel of the present invention includes a substrate having a first surface and a second surface, an antistatic layer provided on the first surface of the substrate, and the second surface of the substrate. And a pressure-sensitive adhesive layer formed from a pressure-sensitive adhesive composition, wherein the antistatic layer comprises a polyaniline sulfonic acid as a conductive polymer component, a polyester resin as a binder, and a cross-linking agent. It is formed from an antistatic agent composition containing an isocyanate-based crosslinking agent, and the pressure-sensitive adhesive composition contains a (meth) acrylic polymer and a polyether compound, and 100 parts by weight of the (meth) acrylic polymer. On the other hand, 0.03-14 mass parts of said polyether compounds are contained, It is characterized by the above-mentioned.

  In the surface protective film for a touch panel of the present invention, the substrate preferably contains polyethylene terephthalate and / or polyethylene naphthalate.

  In the surface protective film for a touch panel of the present invention, it is preferable that the antistatic composition further contains a fatty acid amide as a lubricant.

  In the surface protective film for a touch panel of the present invention, the polyether compound is preferably a surfactant.

  The optical member mounted on the touch panel of the present invention is preferably protected by the surface protective film for touch panel.

  The method for producing a surface protective film for a touch panel according to the present invention comprises a step of preparing an aqueous solution containing the antistatic agent composition, and applying and drying the aqueous solution on the first surface of the substrate to form an antistatic layer. And a step of preparing.

  The surface protective film of the present invention can form a uniform antistatic layer by forming the antistatic layer from an antistatic agent composition containing a specific conductive polymer component, a binder, and a crosslinking agent. In addition, the workability is excellent, the antistatic property based on the antistatic layer and the stability over time of the peeling band voltage are good, and the operation of the touch panel can be confirmed. ) By peeling off the surface protective film affixed to the adherend such as a polarizing plate by forming it from the pressure-sensitive adhesive composition containing the acrylic polymer and the polyether compound in a specific ratio, the interlayer is formed on the same adherend surface. Even when a filler is applied, a surface protective film for a touch panel excellent in wettability with respect to an interlayer filler, a method for producing the surface protective film, and an optical member can be obtained, which is preferable. It has the aspect.

It is typical sectional drawing which shows one structural example of the surface protection film for touchscreens which concerns on this invention. It is typical sectional drawing of the example of 1 structure of the touchscreen which stuck the surface protection film for touchscreens of this invention. It is explanatory drawing which shows the measuring method of peeling voltage.

  Hereinafter, embodiments of the present invention will be described in detail.

<Overall structure of surface protective film for touch panel>
The surface protective film for touch panels disclosed herein (hereinafter sometimes simply referred to as “surface protective film”) is generally referred to as an adhesive sheet, an adhesive tape, an adhesive label, an adhesive film, a surface protective sheet, or the like. In particular, a surface protective film that protects the surface of an optical member at the time of processing or transporting an optical member such as a polarizing plate attached to a touch sensor or glass in a liquid crystal display panel via an adhesive layer. It is suitable as. The pressure-sensitive adhesive layer in the surface protective film is typically formed continuously, but is not limited to such a form, and is formed in a regular or random pattern such as a spot or stripe. It may be an adhesive layer. In addition, the surface protective film disclosed herein may be in the form of a roll or a single sheet.

  The typical structural example of the surface protection film disclosed here is typically shown in FIGS. The surface protective film 1 includes a base material (for example, a polyester film) 12, an antistatic layer 11 provided on the first surface 12, and a second surface of the base material 12 (on the side opposite to the antistatic layer 11). And a pressure-sensitive adhesive layer 13 provided on the surface). The surface protective film 1 is a polarizing film in which the pressure-sensitive adhesive layer 13 is attached to an adherend (a protection target, the touch sensor 32 or the base glass 33 in the liquid crystal display panel (touch panel) 3 via the pressure-sensitive adhesive layer 13. Attached to the surface of the optical member such as the plate 31). The surface protective film 1 before use (that is, before sticking to the adherend) is peeled so that the surface of the pressure-sensitive adhesive layer 13 (sticking surface to the adherend) is at least the pressure-sensitive adhesive layer 13 side. It may be in a form protected by a liner. Alternatively, even when the surface protective film 1 is wound in a roll shape, the pressure-sensitive adhesive layer 13 comes into contact with the back surface of the base material 12 (the surface of the antistatic layer 11) and the surface thereof is protected. Good.

  As shown in FIG. 1, the antistatic layer 11 is formed directly on the first surface of the substrate 12 (without any other layer), and the antistatic layer 11 is exposed on the back surface of the surface protective film 1. (In other words, the mode in which the antistatic layer 11 also serves as a topcoat layer) is provided with an antistatic layer in which the antistatic layer 11 is provided on the substrate 12 as compared with the configuration in which the antistatic layer is provided separately from the topcoat layer. A film (and thus a surface protective film using the film) is advantageous from the viewpoint of improving productivity because the number of layers constituting the surface protective film can be reduced.

<Base material>
The surface protective film of the present invention has a base material having a first surface (back surface) and a second surface (surface opposite to the first surface). In the technology disclosed herein, the resin material constituting the substrate can be used without any particular limitation. For example, transparency, mechanical strength, thermal stability, moisture shielding property, isotropic property, flexibility It is preferable to use a material excellent in properties such as property and dimensional stability. In particular, since the base material has flexibility, the pressure-sensitive adhesive composition can be applied by a roll coater or the like, and can be wound into a roll shape, which is useful.

  Examples of the substrate (support) include polyester polymers such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate; cellulose polymers such as diacetyl cellulose and triacetyl cellulose; polycarbonate polymers; An acrylic polymer such as methyl methacrylate; and the like, a plastic film composed of a resin material having a main resin component (a main component of the resin component, typically a component occupying 50% by mass or more) as the base material It can be preferably used. Other examples of the resin material include styrene polymers such as polystyrene and acrylonitrile-styrene copolymers; olefin polymers such as polyethylene, polypropylene, polyolefins having a cyclic or norbornene structure, and ethylene-propylene copolymers; Examples of the resin material include vinyl chloride polymers; amide polymers such as nylon 6, nylon 6,6, and aromatic polyamide. Still other examples of the resin material include imide polymers, sulfone polymers, polyether sulfone polymers, polyether ether ketone polymers, polyphenylene sulfide polymers, vinyl alcohol polymers, vinylidene chloride polymers, vinyl butyral polymers. , Arylate polymers, polyoxymethylene polymers, epoxy polymers and the like. The base material which consists of 2 or more types of blends of the polymer mentioned above may be sufficient.

  As the substrate, a plastic film made of a transparent thermoplastic resin material can be preferably used. Among the plastic films, it is more preferable to use a polyester film. Here, the polyester film is one having a polymer material (polyester resin) having a main skeleton based on an ester bond such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or polybutylene terephthalate as a main resin component. Say. Such a polyester film has preferable characteristics as a substrate for a surface protective film, such as excellent optical characteristics and dimensional stability. In particular, it is preferable to contain polyethylene terephthalate and / or polyethylene naphthalate as the substrate.

  Various additives such as an antioxidant, an ultraviolet absorber, a plasticizer, and a colorant (pigment, dye, etc.) may be blended in the resin material constituting the substrate as necessary. For example, corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and application of a primer are applied to the first surface of the polyester film (the surface on which the antistatic layer is provided). The surface treatment may be performed. Such a surface treatment can be, for example, a treatment for enhancing the adhesion between the substrate and the antistatic layer. Surface treatment in which polar groups such as hydroxyl groups are introduced on the surface of the substrate can be preferably employed. Moreover, the surface treatment similar to the above may be given to the 2nd surface (surface by which the adhesive layer is formed) of a base material. Such a surface treatment may be a treatment for enhancing the adhesion between the film and the pressure-sensitive adhesive layer (the anchoring property of the pressure-sensitive adhesive layer).

  The surface protective film of the present invention has an antistatic function by having an antistatic layer on the base material, but it is also possible to use a plastic film that has undergone antistatic treatment as the base material. is there. The use of the substrate is preferable because the surface protection film itself can be prevented from being charged when peeled off. Moreover, the base material is a plastic film, and by applying an antistatic treatment to the plastic film, it is possible to reduce the surface protection film itself and to have an excellent antistatic ability to the adherend. In addition, there is no restriction | limiting in particular as a method to provide an antistatic function, A conventionally well-known method can be used, for example, antistatic resin which consists of an antistatic agent and a resin component, a conductive polymer, a conductive substance Examples thereof include a method of applying a conductive resin, a method of depositing or plating a conductive material, a method of kneading an antistatic agent, and the like.

  As thickness of the said base material, it is 5-200 micrometers normally, Preferably it is about 10-100 micrometers. When the thickness of the base material is within the above range, it is preferable because the workability for bonding to the adherend and the workability for peeling from the adherend are excellent.

<Antistatic layer (topcoat layer)>
The surface protective film of the present invention is provided on a base material having a first surface (back surface) and a second surface (surface opposite to the first surface), and the first surface (back surface) of the base material. A surface protection film comprising an antistatic layer and an adhesive layer formed of an adhesive composition on the second surface of the substrate, wherein the antistatic layer is polyanilinesulfonic acid as a conductive polymer component And an antistatic agent composition containing a polyester resin as a binder and an isocyanate crosslinking agent as a crosslinking agent. When the surface protective film has an antistatic layer (topcoat layer), the antistatic property of the surface protective film and the stability over time of the stripping voltage are improved, which is a preferred embodiment.

<Conductive polymer>
The antistatic layer contains polyaniline sulfonic acid as a conductive polymer component. By using the conductive polymer, the antistatic property based on the antistatic layer and the peel voltage over time can be satisfied. The polyaniline sulfonic acid is “water-soluble”, but can be fixed in the antistatic layer by using an isocyanate-based crosslinking agent described later, and water resistance can be improved. By using the water-soluble conductive polymer-containing aqueous solution, an antistatic layer having an excellent surface resistance value with time can be obtained, which is a preferred embodiment. On the other hand, when the conductive polymer used in forming the antistatic layer is “water-dispersible”, aggregates are generated when the antistatic layer is formed using the water-dispersible conductive polymer-containing solution. This is not preferable because it tends to be easy and cannot be applied uniformly, and the surface resistance value with time tends to be extremely inferior.

  As for the usage-amount of the said conductive polymer, 10-200 mass parts is preferable with respect to 100 mass parts of binder contained in an antistatic layer, More preferably, it is 25-150 mass parts, More preferably, it is 40-120. Part by mass. If the amount of the conductive polymer used is too small, the antistatic effect may be reduced. If the amount of the conductive polymer used is too large, the adhesion of the antistatic layer to the substrate may be reduced, or the transparency may be reduced. There is a risk of lowering, which is not preferable.

The polyaniline sulfonic acid used as the conductive polymer component preferably has a polystyrene equivalent weight average molecular weight (Mw) of 5 × 10 ⁵ or less, more preferably 3 × 10 ⁵ or less. In addition, the weight average molecular weight of these conductive polymers is usually preferably 1 × 10 ³ or more, and more preferably 5 × 10 ³ or more.

As a method of forming the antistatic layer, a method of applying and drying (or curing) a coating material (antistatic agent composition) for forming an antistatic layer on the first surface of the base material (support) can be adopted. The conductive polymer component used for the preparation of the coating material includes polyaniline sulfonic acid, a polyester resin as a binder, and an isocyanate-based crosslinking agent as a crosslinking agent as essential components, and the essential component is dissolved in water. Can be preferably used (conductive polymer aqueous solution or simply referred to as an aqueous solution). Such an aqueous conductive polymer solution is prepared by, for example, dissolving a conductive polymer having a hydrophilic functional group (which can be synthesized by a method such as copolymerizing a monomer having a hydrophilic functional group in the molecule) in water. can do. Examples of the hydrophilic functional group include a sulfo group, amino group, amide group, imino group, hydroxyl group, mercapto group, hydrazino group, carboxyl group, quaternary ammonium group, sulfate group (—O—SO ₃ H), phosphorus An acid ester group (for example, —O—PO (OH) ₂ ) and the like are exemplified. Such hydrophilic functional groups may form a salt.

  Moreover, as a commercial item of the said polyaniline sulfonic acid aqueous solution, Mitsubishi Rayon Co., Ltd. brand name "aqua-PASS" etc. are illustrated.

  The antistatic layer disclosed herein contains polyaniline sulfonic acid (polyaniline type) as an essential component as the conductive polymer component. For example, one or more other antistatic components (conductive polymer) Organic conductive materials other than the above, inorganic conductive materials, antistatic agents, etc.) may be included together. In a preferred embodiment, the antistatic layer contains substantially no antistatic component other than the conductive polymer, that is, the antistatic component contained in the antistatic layer is substantially only a conductive polymer. The embodiment consisting of can be implemented more preferably.

  Examples of the organic conductive substance include cation type antistatic agents having a cationic functional group such as a quaternary ammonium salt, a pyridinium salt, a primary amino group, a secondary amino group, and a tertiary amino group; sulfonates and sulfates Anionic antistatic agents having an anionic functional group such as salts, phosphonates, phosphate esters; amphoteric ionic antistatic agents such as alkylbetaines and their derivatives, imidazolines and their derivatives, alanine and their derivatives; amino alcohols Nonionic antistatic agents such as glycerin and derivatives thereof, glycerin and derivatives thereof, polyethylene glycol and derivatives thereof; polymerization of monomers having the cation type, anion type or zwitterion type ion conductive groups (for example, quaternary ammonium base) Or an ion conductive polymer obtained by copolymerization; poly Include; thiophene, polyaniline, polypyrrole, polyethylene imine, a conductive polymer such as an allylamine polymer. Such an antistatic agent may be used individually by 1 type, and may be used in combination of 2 or more type.

  Examples of the inorganic conductive material include tin oxide, antimony oxide, indium oxide, cadmium oxide, titanium oxide, zinc oxide, indium, tin, antimony, gold, silver, copper, aluminum, nickel, chromium, titanium, iron, cobalt, Examples thereof include copper iodide, ITO (indium oxide / tin oxide), ATO (antimony oxide / tin oxide), and the like. Such inorganic conductive materials may be used alone or in combination of two or more.

  Examples of the antistatic agent include a cationic antistatic agent, an anionic antistatic agent, an amphoteric ion antistatic agent, a nonionic antistatic agent, and a monomer having a cationic, anionic or zwitterionic ion conductive group. And an ion conductive polymer obtained by polymerizing or copolymerizing.

<Binder>
The antistatic layer contains a polyester resin as an essential component as a binder. The polyester resin is preferably a resin material containing polyester as a main component (typically exceeding 50% by mass, preferably 75% by mass or more, for example, 90% by mass or more). The polyester typically includes polyvalent carboxylic acids (typically dicarboxylic acids) having two or more carboxyl groups in one molecule and derivatives thereof (an anhydride, esterified product, halogenated product of the polyvalent carboxylic acid). Selected from one or more compounds (polyhydric carboxylic acid component) selected from, and polyhydric alcohols (typically diols) having two or more hydroxyl groups in one molecule. It is preferable to have a structure in which one or two or more compounds (polyhydric alcohol component) are condensed.

  Examples of compounds that can be employed as the polyvalent carboxylic acid component include oxalic acid, malonic acid, difluoromalonic acid, alkylmalonic acid, succinic acid, tetrafluorosuccinic acid, alkylsuccinic acid, (±) -malic acid, meso. -Tartaric acid, itaconic acid, maleic acid, methylmaleic acid, fumaric acid, methylfumaric acid, acetylenedicarboxylic acid, glutaric acid, hexafluoroglutaric acid, methylglutaric acid, glutaconic acid, adipic acid, dithioadipic acid, methyladipic acid, dimethyl Adipic acid, tetramethyladipic acid, methyleneadipic acid, muconic acid, galactaric acid, pimelic acid, suberic acid, perfluorosuberic acid, 3,3,6,6-tetramethylsuberic acid, azelaic acid, sebacic acid, perfluoro Sebacic acid, brassic acid, dodecyl dicar Aliphatic dicarboxylic acids such as acid, tridecyl dicarboxylic acid, tetradecyl dicarboxylic acid; cycloalkyl dicarboxylic acid (for example, 1,4-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid), 1,4- (2- Alicyclic dicarboxylic acids such as norbornene) dicarboxylic acid, 5-norbornene-2,3-dicarboxylic acid (hymic acid), adamantane dicarboxylic acid, spiroheptane dicarboxylic acid; phthalic acid, isophthalic acid, dithioisophthalic acid, methylisophthalic acid, Dimethylisophthalic acid, chloroisophthalic acid, dichloroisophthalic acid, terephthalic acid, methylterephthalic acid, dimethylterephthalic acid, chloroterephthalic acid, bromoterephthalic acid, naphthalenedicarboxylic acid, oxofluorenedicarboxylic acid, anthracenedical Bonic acid, biphenyl dicarboxylic acid, biphenylene dicarboxylic acid, dimethyl biphenylene dicarboxylic acid, 4,4 "-p-terephenylene dicarboxylic acid, 4,4" -p-quarelphenyl dicarboxylic acid, bibenzyl dicarboxylic acid, azobenzene dicarboxylic acid, Homophthalic acid, phenylenediacetic acid, phenylenedipropionic acid, naphthalenedicarboxylic acid, naphthalenedipropionic acid, biphenyldiacetic acid, biphenyldipropionic acid, 3,3 ′-[4,4 ′-(methylenedi-p-biphenylene) dipropion Aromatic dicarboxylic acids such as acid, 4,4′-bibenzyldiacetic acid, 3,3 ′ (4,4′-bibenzyl) dipropionic acid, oxydi-p-phenylenediacetic acid; Acid anhydrides of any of the polyhydric carboxylic acids mentioned above (Eg alkyl esters). It can be a monoester, a diester or the like. ); Acid halides corresponding to any of the polyvalent carboxylic acids described above (for example, dicarboxylic acid chloride); and the like.

  Preferable examples of the compound that can be employed as the polyvalent carboxylic acid component include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, and acid anhydrides thereof; adipic acid, sebacic acid, azelaic acid, succinic acid, Aliphatic dicarboxylic acids such as fumaric acid, maleic acid, hymic acid, 1,4-cyclohexanedicarboxylic acid, and acid anhydrides thereof; and lower alkyl esters of the dicarboxylic acids (for example, monoalcohols having 1 to 3 carbon atoms) Ester) and the like.

  On the other hand, examples of compounds that can be employed as the polyhydric alcohol component include ethylene glycol, propylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, and 1,4-butanediol. , Neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, 3-methylpentanediol, diethylene glycol, 1,4-cyclohexanedimethanol, 3-methyl-1,5-pentanediol, 2-methyl- Diols such as 1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, xylylene glycol, hydrogenated bisphenol A, and bisphenol A Is mentioned. Other examples include alkylene oxide adducts (for example, ethylene oxide adducts, propylene oxide adducts, etc.) of these compounds.

The molecular weight of the polyester resin is, for example, about 5 × 10 ^{3 to} 1.5 × 10 ⁵ (preferably 1 × 10 5) as a weight average molecular weight (Mw) in terms of standard polystyrene measured by gel permeation chromatography (GPC). ^4-6 × 10 ⁴ ). Moreover, the glass transition temperature (Tg) of the said polyester resin can be 0-120 degreeC (preferably 10-80 degreeC), for example.

  As the polyester resin, a commercially available product name “Vylonal” manufactured by Toyobo Co., Ltd. can be used.

  The antistatic layer (topcoat layer) is a resin other than a polyester resin (for example, acrylic) as a binder as long as the performance of the surface protective film disclosed herein (for example, performance such as antistatic properties) is not significantly impaired. Resin, acrylic resin, acrylic styrene resin, acrylic silicone resin, silicone resin, polysilazane resin, polyurethane resin, fluororesin, polyolefin resin and the like. A preferred embodiment of the technology disclosed herein is a case where the binder of the antistatic layer is substantially composed only of a polyester resin. For example, the antistatic layer whose ratio of the polyester resin to a binder is 98-100 mass% is preferable. The proportion of the binder in the entire antistatic layer can be, for example, 50 to 95% by mass, and usually 60 to 90% by mass is appropriate.

<Lubricant>
The antistatic layer (topcoat layer) in the technique disclosed herein is preferably a fatty acid amide as a lubricant. By using fatty acid amide as a lubricant, a further release treatment (for example, a treatment in which a known release treatment agent such as a silicone release agent or a long-chain alkyl release agent is applied and dried) is applied to the surface of the antistatic layer. Even in the case where the coating is not performed, an antistatic layer (topcoat layer) having both sufficient slipping property and printing adhesion can be obtained, which can be a preferable mode. Thus, the aspect in which the surface of the antistatic layer is not further peeled can prevent whitening due to the peeling treatment agent (for example, whitening due to storage under heating and humidification conditions). This is preferable. It is also advantageous from the viewpoint of solvent resistance.

  Specific examples of the fatty acid amide include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, hydroxystearic acid amide, oleic acid amide, erucic acid amide, N-oleylparticic acid amide, N-stearyl stearic acid. Amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, methylol stearic acid amide, methylene bis stearic acid amide, ethylene biscapric acid amide, ethylene bis lauric acid amide, ethylene bis stearic acid Amides, ethylene bishydroxystearic acid amides, ethylene bisbehenic acid amides, hexamethylene bisstearic acid amides, hexamethylene bisbehenic acid amides, hexamethylene hydroxystearic acid amides N, N′-distearyl adipic acid amide, N, N′-distearyl sebacic acid amide, ethylene bisoleic acid amide, ethylene biserucic acid amide, hexamethylene bisoleic acid amide, N, N′-dioleyl Examples include adipic acid amide, N, N′-dioleyl sebacic acid amide, m-xylylene bisstearic acid amide, m-xylylene bishydroxystearic acid amide, N, N′-stearyl isophthalic acid amide, and the like. These lubricants may be used alone or in combination of two or more.

  The ratio of the lubricant to the whole antistatic layer can be 1 to 50% by mass, and usually 5 to 40% by mass is appropriate. When there is too little content rate of a lubricant, it exists in the tendency for slipperiness to fall easily. If the content of the lubricant is too large, the print adhesion may be lowered.

  The technique disclosed herein can be carried out in a mode in which the antistatic layer (topcoat layer) contains other lubricant in addition to the fatty acid amide, as long as the application effect is not greatly impaired. Examples of such other lubricants include various waxes such as petroleum wax (paraffin wax, etc.), mineral wax (montan wax, etc.), higher fatty acid (cellotic acid, etc.), and neutral fat (palmitic acid triglyceride, etc.). It is done. Alternatively, in addition to the wax, a general silicone-based lubricant, a fluorine-based lubricant, and the like may be supplemented. The technology disclosed herein can be preferably implemented in an embodiment that does not substantially contain such a silicone-based lubricant, a fluorine-based lubricant and the like. However, as long as the application effect of the technology disclosed herein is not significantly impaired, the silicone compound used for a purpose different from the lubricant (for example, as an antifoaming agent for the coating material for forming an antistatic layer described later) It does not exclude inclusion.

<Crosslinking agent>
The antistatic layer contains an isocyanate-based crosslinking agent as a crosslinking agent. By using the isocyanate-based crosslinking agent, the water-soluble polyaniline sulfonic acid, which is an essential component when forming the antistatic layer, can be fixed in the binder, has excellent water resistance, and further improves printing adhesion. The effect can be realized.

  In addition, as the isocyanate-based crosslinking agent, it is preferable to use a blocked isocyanate-based crosslinking agent that is stable even in an aqueous solution. Specific examples of the blocked isocyanate-based crosslinking agent include isocyanate-based crosslinking agents that can be used in the preparation of general pressure-sensitive adhesive layers and antistatic layers (topcoat layers) (for example, pressure-sensitive adhesive layers described later). Isocyanate compounds (isocyanate-based cross-linking agents)) alcohols, phenols, thiophenols, amines, imides, oximes, lactams, active methylene compounds, mercaptans, imines, ureas, diaryl compounds And those blocked with sodium bisulfite can be used.

  The antistatic layer in the technique disclosed herein may contain other antistatic components, antioxidants, colorants (pigments, dyes, etc.), fluidity modifiers (thixotropic agents, thickeners, etc.), if necessary. It may contain additives such as film-forming aids, surfactants (such as antifoaming agents), and preservatives.

<Formation of antistatic layer>
The antistatic layer (topcoat layer) is a liquid composition (for forming an antistatic layer) in which essential components such as the conductive polymer component and additives used as necessary are dissolved in an appropriate solvent (such as water). Can be suitably formed by a technique including applying a coating material, an antistatic agent composition) to a substrate. For example, a method of applying the coating material to the first surface of the substrate and drying it, and performing a curing treatment (heat treatment, ultraviolet treatment, etc.) as necessary can be preferably employed. The NV (nonvolatile content) of the coating material can be, for example, 5% by mass or less (typically 0.05 to 5% by mass), and usually 1% by mass or less (typically 0.10 to 10%). 1 mass%) is appropriate. In the case of forming an antistatic layer with a small thickness, it is preferable that the NV of the coating material is, for example, 0.05 to 0.50 mass% (for example, 0.10 to 0.40 mass%). Thus, a more uniform antistatic layer can be formed by using a low NV coating material.

  As the solvent constituting the coating material for forming the antistatic layer, a solvent capable of stably dissolving the components for forming the antistatic layer is preferable. Such a solvent may be an organic solvent, water, or a mixed solvent thereof. Examples of the organic solvent include esters such as ethyl acetate; ketones such as methyl ethyl ketone, acetone and cyclohexanone; cyclic ethers such as tetrahydrofuran (THF) and dioxane; aliphatic or alicyclic such as n-hexane and cyclohexane. Hydrocarbons; aromatic hydrocarbons such as toluene and xylene; aliphatic or alicyclic alcohols such as methanol, ethanol, n-propanol, isopropanol, and cyclohexanol; alkylene glycol monoalkyl ether (for example, ethylene glycol monomethyl ether) , Ethylene glycol monoethyl ether), glycol ethers such as dialkylene glycol monoalkyl ether; and the like can be used. In a preferred embodiment, the solvent of the coating material is water or a mixed solvent containing water as a main component (for example, a mixed solvent of water and ethanol).

<Properties of antistatic layer>
The thickness of the antistatic layer in the technique disclosed herein is typically 3 to 500 nm, preferably 3 to 100 nm, and more preferably 3 to 60 nm. If the thickness of the antistatic layer is too small, it becomes difficult to form the antistatic layer uniformly (for example, the thickness of the antistatic layer varies greatly depending on the location). Unevenness may be likely to occur. On the other hand, if it is too thick, the properties of the substrate (optical properties, dimensional stability, etc.) may be affected.

In a preferred embodiment of the surface protective film disclosed herein, the surface resistance value (Ω / □) measured on the surface of the antistatic layer is preferably 1.0 × 10 ⁷ or more and 1.0 × 10 ^11. It is less than, More preferably, it is 1.0 * 10 < ⁸ > or more and less than 5.0 * ¹⁰ <10>, More preferably, it is 1.0 * ¹⁰ < ⁹ > or more and less than 2.0 * ¹⁰ <10>. A surface protective film exhibiting a surface resistance value within the above range can be suitably used as a surface protective film used in the processing or transporting of articles that dislike static electricity such as liquid crystal cells and semiconductor devices. Further, the surface protective film showing the surface resistance value within the above range can be confirmed even when the polarizing plate is mounted above the touch panel sensor and the surface protective film is stuck on the polarizing plate. Can be useful. The surface resistance value can be calculated from the surface resistance value measured under an atmosphere of 23 ° C. and 50% RH using a commercially available insulation resistance measuring device.

  The surface protective film disclosed herein preferably has a property that the back surface (surface of the antistatic layer) can be easily printed with water-based ink or oil-based ink (for example, using an oil-based marking pen). Such a surface protective film has an identification number or the like of an adherend to be protected in the process of processing or transporting an adherend (for example, an optical member such as a polarizing plate) performed with the surface protective film attached. It is suitable for displaying on the surface protective film. Therefore, it is preferable that the surface protective film has excellent printability. For example, it is preferable that the solvent is alcohol-based and has high printability for oil-based inks containing pigments. Moreover, it is preferable that the printed ink is difficult to be removed by rubbing or transfer (that is, excellent in print adhesion). The surface protective film disclosed herein may also have a solvent resistance that does not cause a noticeable change in appearance even if the print is wiped with alcohol (for example, ethyl alcohol) when correcting or erasing the print. preferable.

  The surface protective film disclosed herein can be implemented in an embodiment including other layers in addition to the base material, the pressure-sensitive adhesive layer, and the antistatic layer. Examples of the arrangement of the “other layer” include a space between the first surface (back surface) of the substrate and the antistatic layer, a space between the second surface (front surface) of the substrate and the pressure-sensitive adhesive layer, and the like. The layer disposed between the back surface of the substrate and the antistatic layer can be, for example, a layer containing an antistatic component (the above-described antistatic layer). The layer disposed between the front surface of the substrate and the pressure-sensitive adhesive layer can be, for example, an undercoat layer (anchor layer) or an antistatic layer that enhances the anchoring property of the pressure-sensitive adhesive layer with respect to the second surface. It may be a surface protective film having a configuration in which an antistatic layer is disposed on the front surface of the substrate, an anchor layer is disposed on the antistatic layer, and an adhesive layer is disposed thereon.

<Adhesive layer>
The surface protective film of the present invention has the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition, and the pressure-sensitive adhesive composition comprises a (meth) acrylic polymer and a poly An ether compound is contained, and the polyether compound is contained in an amount of 0.03 to 14 parts by mass with respect to 100 parts by mass of the (meth) acrylic polymer.

  The said (meth) acrylic-type polymer can use the (meth) acrylic-type monomer which has a C1-C14 alkyl group as a raw material monomer which comprises this. As said (meth) acrylic-type monomer, 1 type (s) or 2 or more types can be used as a main component. By using the (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms, it becomes easy to control the adhesive force to the adherend (protected body) to be low, and light releasability and re-peeling. A surface protective film having excellent properties can be obtained. In the present invention, the (meth) acrylic polymer refers to an acrylic polymer and / or a methacrylic polymer, and the (meth) acrylate refers to acrylate and / or methacrylate.

  Specific examples of the (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, s-butyl (meth) ) Acrylate, t-butyl (meth) acrylate, isobutyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-nonyl ( (Meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, n-tetradecyl (meth) acrylate, etc. It is done.

  Among these, the surface protective film of the present invention includes hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl. 6 to 14 carbon atoms such as (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, n-tetradecyl (meth) acrylate and the like. A (meth) acrylic monomer having an alkyl group is preferred. In particular, by using a (meth) acrylic monomer having an alkyl group having 6 to 14 carbon atoms, it becomes easy to control the adhesive force to the adherend to be low, and the removability is excellent.

  In particular, it is preferable to contain 50% by mass or more of a (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms with respect to 100% by mass of the total amount of monomer components constituting the (meth) acrylic polymer. More preferably, it is 60 mass% or more, More preferably, it is 70 mass% or more, Most preferably, it is 80-93 mass%. If it is less than 50% by mass, the appropriate wettability of the pressure-sensitive adhesive composition and the cohesive strength of the pressure-sensitive adhesive layer will be inferior, which is not preferable.

  In the pressure-sensitive adhesive composition of the present invention, the (meth) acrylic polymer preferably contains a (meth) acrylic monomer having a hydroxyl group as a raw material monomer. As said (meth) acrylic-type monomer which has the said hydroxyl group, 1 type (s) or 2 or more types can be used as a main component.

  By using the (meth) acrylic monomer having a hydroxyl group, it is easy to control the crosslinking of the pressure-sensitive adhesive composition, and it is easy to control the balance between the improvement of wettability by flow and the reduction of the adhesive strength in peeling. Become. Furthermore, unlike carboxyl groups and sulfonate groups that can generally act as crosslinking sites, hydroxyl groups have a moderate interaction when an ionic compound or the like is used as an antistatic component. Also in terms of surface, it can be suitably used.

  Examples of the (meth) acrylic monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth). Acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) methyl acrylate, N-methylol (meth) acrylamide and the like. . In particular, it is preferable to use a (meth) acrylic monomer having a hydroxyl group having 4 or more carbon atoms in the alkyl group, since light release at the time of high-speed peeling is easy.

  It is preferable to contain 15 parts by mass or less of the (meth) acrylic monomer having a hydroxyl group with respect to 100 parts by mass of the (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms. Is 1 to 13 parts by mass, more preferably 2 to 11 parts by mass, and most preferably 3.5 to 10 parts by mass. Within the above range, the balance between the wettability of the pressure-sensitive adhesive composition and the cohesive force of the resulting pressure-sensitive adhesive layer can be easily controlled, which is preferable.

  In addition, as another polymerizable monomer component, the Tg is 0 ° C. or lower (usually −100 ° C. or higher) because the adhesive performance is easily balanced, and the glass transition temperature or peeling of the (meth) acrylic polymer A polymerizable monomer or the like for adjusting the property can be used as long as the effects of the present invention are not impaired.

  As other polymerizable monomers other than the (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms used in the (meth) acrylic polymer and the (meth) acrylic monomer having a hydroxyl group, A (meth) acrylic monomer having a carboxyl group can be used.

  Examples of the (meth) acrylic monomer having a carboxyl group include (meth) acrylic acid, carboxylethyl (meth) acrylate, carboxylpentyl (meth) acrylate, and the like.

  The (meth) acrylic monomer having a carboxyl group is preferably 5 parts by mass or less with respect to 100 parts by mass of the (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms. More preferably, it is more preferably 1 part by mass or less, and most preferably 0.005 to 0.5 part by mass. When the amount exceeds 5 parts by mass, there are many acid functional groups such as carboxyl groups having a large polar action. For example, when an ionic compound is blended as an antistatic component, an acid functional group such as a carboxyl group is added to the ionic compound. When the groups interact with each other, ion conduction is hindered, conductivity efficiency is lowered, and sufficient antistatic properties may not be obtained, which is not preferable.

  Furthermore, the (meth) acrylic monomer having a C1-C14 alkyl group used in the (meth) acrylic polymer, the (meth) acrylic monomer having a hydroxyl group, and the (meth) having a carboxyl group Other polymerizable monomers other than acrylic monomers can be used without particular limitation as long as they do not impair the characteristics of the present invention. For example, cohesive strength / heat resistance improving components such as cyano group-containing monomers, vinyl ester monomers, aromatic vinyl monomers, amide group-containing monomers, imide group-containing monomers, amino group-containing monomers, epoxy group-containing monomers, N-acryloylmorpholine In addition, a component having a functional group functioning as an adhesive strength improvement or a crosslinking base point such as a vinyl ether monomer can be appropriately used. These polymerizable monomers may be used alone or in combination of two or more.

  Examples of the cyano group-containing monomer include acrylonitrile and methacrylonitrile.

  Examples of the vinyl ester monomer include vinyl acetate, vinyl propionate, vinyl laurate, and the like.

  Examples of the aromatic vinyl monomer include styrene, chlorostyrene, chloromethyl styrene, α-methyl styrene, other substituted styrenes, and the like.

  Examples of amide group-containing monomers include acrylamide, methacrylamide, diethyl acrylamide, N-vinyl pyrrolidone, N, N-dimethyl acrylamide, N, N-dimethyl methacrylamide, N, N-diethyl acrylamide, N, N-diethyl methacryl. Examples include amide, N, N′-methylenebisacrylamide, N, N-dimethylaminopropyl acrylamide, N, N-dimethylaminopropyl methacrylamide, and diacetone acrylamide.

  Examples of the imide group-containing monomer include cyclohexylmaleimide, isopropylmaleimide, N-cyclohexylmaleimide, and itaconimide.

  Examples of the amino group-containing monomer include aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, and the like.

  Examples of the epoxy group-containing monomer include glycidyl (meth) acrylate, methyl glycidyl (meth) acrylate, and allyl glycidyl ether.

  Examples of the vinyl ether monomer include methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, and the like.

  In the present invention, other polymerizable monomers other than the (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms, the (meth) acrylic monomer having a hydroxyl group, and the (meth) acrylic monomer having a carboxyl group are as follows: It is preferably 0 to 20 parts by mass, and more preferably 0 to 10 parts by mass with respect to 100 parts by mass of the (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms. By using the other polymerizable monomer within the above range, when an ionic compound is used as an antistatic agent, a good interaction with the ionic compound and a good removability are appropriately adjusted. Can do.

  The (meth) acrylic polymer preferably has a weight average molecular weight (Mw) of 100,000 to 5,000,000, more preferably 200,000 to 4,000,000, still more preferably 300,000 to 3,000,000. When the weight average molecular weight is smaller than 100,000, the adhesive force tends to be generated due to the reduced cohesive force of the pressure-sensitive adhesive layer. On the other hand, when the weight average molecular weight exceeds 5,000,000, the fluidity of the polymer is lowered, the wetness to the adherend (for example, polarizing plate) becomes insufficient, and the adherend and the pressure-sensitive adhesive layer of the surface protective film It tends to cause blisters that occur during the period. In addition, a weight average molecular weight means what was obtained by measuring by GPC (gel permeation chromatography).

  The glass transition temperature (Tg) of the (meth) acrylic polymer is preferably 0 ° C. or lower, more preferably −10 ° C. or lower (usually −100 ° C. or higher). When the glass transition temperature is higher than 0 ° C., the polymer is difficult to flow, for example, the wettability to the polarizing plate becomes insufficient, and it tends to cause blisters generated between the polarizing plate and the pressure-sensitive adhesive layer of the surface protective film. There is. In particular, when the glass transition temperature is set to −61 ° C. or lower, an adhesive layer excellent in wettability to the polarizing plate and light peelability is easily obtained. The glass transition temperature of the (meth) acrylic polymer can be adjusted within the above range by appropriately changing the monomer component and composition ratio used.

  The polymerization method of the (meth) acrylic polymer is not particularly limited and can be polymerized by a known method such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization, etc. From the viewpoint of characteristics such as low contamination to the adherend (protected body), solution polymerization is a more preferable embodiment. Further, the polymer obtained may be any of a random copolymer, a block copolymer, an alternating copolymer, a graft copolymer, and the like.

  The solution polymerization method is not particularly limited, and examples thereof include a method in which the monomer component, the polymerization initiator, etc. are dissolved in a solvent and polymerized by heating to obtain an acrylic polymer solution containing an acrylic polymer. .

  Various common solvents can be used as the solvent used in the solution polymerization method. Examples of such a solvent (polymerization solvent) include aromatic hydrocarbons such as toluene, benzene and xylene; esters such as ethyl acetate and n-butyl acetate; aliphatic carbonization such as n-hexane and n-heptane. Examples of the organic solvents include hydrogens; alicyclic hydrocarbons such as cyclohexane and methylcyclohexane; ketones such as methyl ethyl ketone and methyl isobutyl ketone. The said solvent can be used individually or in combination of 2 or more types.

  Although it does not specifically limit as said polymerization initiator, For example, a peroxide polymerization initiator, an azo polymerization initiator, etc. are mentioned. The peroxide polymerization initiator is not particularly limited, and examples thereof include peroxy carbonate, ketone peroxide, peroxy ketal, hydroperoxide, dialkyl peroxide, diacyl peroxide, peroxy ester, and the like. More specifically, benzoyl peroxide, t-butyl hydroperoxide, di-t-butyl peroxide, t-butyl peroxybenzoate, dicumyl peroxide, 1,1-bis (t-butylperoxy)- 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclododecane and the like can be mentioned. The azo polymerization initiator is not particularly limited. For example, 2,2′-azobisisobutyronitrile, 2,2′-azobis-2-methylbutyronitrile, 2,2′-azobis (2 , 4-Dimethylvaleronitrile), 2,2'azobis (2-methylpropionic acid) dimethyl, 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile), 1,1'-azobis (cyclohexane -1-carbonitrile), 2,2'-azobis (2,4,4-trimethylpentane), 4,4'-azobis-4-cyanovaleric acid, 2,2'-azobis (2-amidinopropane) dihydro Chloride, 2,2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis (2-methylpropylene) Namidine) disulfate, 2,2'-azobis (N, N'-dimethyleneisobutylamidine) hydrochloride, 2,2'-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] hydrate Etc. The said polymerization initiator can be used individually or in combination of 2 or more types.

  The blending ratio of the polymerization initiator is not particularly limited, but is preferably 0.01 to 5 parts by mass, and more preferably with respect to the total amount of monomer components (100 parts by mass) constituting the (meth) acrylic polymer. Is 0.05 to 3 parts by mass.

  Although it does not specifically limit as a heating temperature at the time of superposing | polymerizing by heating with the said solution polymerization method, For example, 50-80 degreeC is mentioned. Although it does not restrict | limit especially as heating time, For example, 1 to 24 hours is mentioned.

<Polyether compound>
It is preferable that the pressure-sensitive adhesive composition contains a polyether compound, and the polyether compound is a surfactant. The pressure-sensitive adhesive composition can be provided with an appropriate antistatic property by blending a specific proportion of the polyether compound, and further wetted with respect to the interlayer filler on the adherend surface after peeling off the surface protective film. It is possible to secure sex and is useful.

  Specific examples of the polyether compound include, for example, polyoxyalkylene alkylamine, polyoxyalkylene diamine, polyoxyalkylene fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl ether, Nonionic surfactants such as oxyalkylene alkyl allyl ether and polyoxyalkylene alkyl phenyl allyl ether; polyoxyalkylene alkyl ether sulfate ester salt, polyoxyalkylene alkyl ether phosphate ester salt, polyoxyalkylene alkyl phenyl ether sulfate ester salt , Anionic surfactants such as polyoxyalkylene alkylphenyl ether phosphates; Cationic surfactants and amphoteric surfactants having a xyalkylene chain (polyalkylene oxide chain), polyether compounds having a polyoxyalkylene chain (and derivatives thereof), acrylic compounds having a polyoxyalkylene chain ( And derivatives thereof). The said polyether compound may be used independently and may be used in combination of 2 or more type.

  Specific examples of the polyether compound having a polyoxyalkylene chain include polypropylene glycol (PPG) -polyethylene glycol (PEG) block copolymer, PPG-PEG-PPG block copolymer, and PEG-PPG-PEG. Examples thereof include block copolymers. Examples of the derivative of the polyether compound having a polyoxyalkylene chain include an oxypropylene group-containing compound whose end is etherified (PPG monoalkyl ether, PEG-PPG monoalkyl ether, etc.), an oxypropylene group whose end is acetylated Containing compounds (terminal acetylated PPG and the like), and the like.

  Specific examples of the acrylic compound having a polyoxyalkylene chain include a (meth) acrylate polymer having an oxyalkylene group. As the oxyalkylene group, the added mole number of oxyalkylene units is preferably 1 to 50, more preferably 2 to 30 from the viewpoint of coordination of the ionic compound when an ionic compound is blended as an antistatic component. Preferably, 2-20 are more preferable. The terminal of the oxyalkylene chain may be a hydroxyl group or may be substituted with an alkyl group, a phenyl group or the like.

  The (meth) acrylate polymer having an oxyalkylene group is preferably a polymer containing (meth) acrylic acid alkylene oxide as a monomer unit (component). As a specific example of the (meth) acrylic acid alkylene oxide, As the ethylene glycol group-containing (meth) acrylate, for example, methoxy-polyethylene glycol (meth) acrylate type such as methoxy-diethylene glycol (meth) acrylate and methoxy-triethylene glycol (meth) acrylate, ethoxy-diethylene glycol (meth) Acrylate, ethoxy-polyethylene glycol (meth) acrylate type such as ethoxy-triethylene glycol (meth) acrylate, butoxy-diethylene glycol (meth) acrylate, Butoxy-polyethylene glycol (meth) acrylate type such as toxi-triethylene glycol (meth) acrylate, phenoxy-polyethylene glycol (meth) acrylate type such as phenoxy-diethylene glycol (meth) acrylate, phenoxy-triethylene glycol (meth) acrylate, Examples include 2-ethylhexyl-polyethylene glycol (meth) acrylate, nonylphenol-polyethylene glycol (meth) acrylate type, and methoxy-polypropylene glycol (meth) acrylate type such as methoxy-dipropylene glycol (meth) acrylate.

  Moreover, as said monomer unit (component), other monomer units (component) other than the said (meth) acrylic-acid alkylene oxide can also be used. Specific examples of other monomer components include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, and isobutyl (meth) acrylate. , Hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate , Acrylate and / or methacrylate having an alkyl group having 1 to 14 carbon atoms such as isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, and n-tetradecyl (meth) acrylate Door and the like.

  Furthermore, as other monomer components other than the (meth) acrylic acid alkylene oxide, carboxyl group-containing (meth) acrylate, phosphoric acid group-containing (meth) acrylate, cyano group-containing (meth) acrylate, vinyl esters, aromatic vinyl compounds , Acid anhydride group-containing (meth) acrylate, hydroxyl group-containing (meth) acrylate, amide group-containing (meth) acrylate, amino group-containing (meth) acrylate, epoxy group-containing (meth) acrylate, N-acryloylmorpholine, vinyl ethers Etc. can be used as appropriate.

  In a more preferred embodiment, the polyether compound is a compound having a (poly) ethylene oxide chain at least partially. By blending the (poly) ethylene oxide chain-containing compound, the compatibility between the (meth) acrylic polymer as the base polymer and the antistatic component is improved, bleeding to the adherend is suitably suppressed, and low contamination -Sensitive pressure-sensitive adhesive composition is obtained. In particular, when a PPG-PEG-PPG block copolymer is used, a pressure-sensitive adhesive excellent in low contamination can be obtained. As the polyethylene oxide chain-containing compound, the weight of the (poly) ethylene oxide chain in the entire polyether compound is preferably 5 to 90% by mass, more preferably 5 to 85% by mass, and still more preferably 5 to 80%. % By mass, most preferably 5 to 75% by mass.

  Furthermore, specific examples when the polyether compound is a surfactant include, for example, an anionic reactive surfactant having a (meth) acryloyl group or an allyl group, a nonionic reactive surfactant, a cationic type And reactive surfactants.

  Examples of the anionic reactive surfactant include those represented by formulas (A1) to (A10).

［式（Ａ１）中のＲ_１は水素またはメチル基を表し、Ｒ_２は炭素数１から３０の炭化水素基またはアシル基を表し、Ｘはアニオン性親水基を表し、Ｒ_３およびＲ_４は同一または異なって、炭素数１から６のアルキレン基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］。

[R ₁ in Formula (A1) represents hydrogen or a methyl group, R ₂ represents a hydrocarbon group having 1 to 30 carbon atoms or an acyl group, X represents an anionic hydrophilic group, R ₃ and R ₄ are The alkylene groups having 1 to 6 carbon atoms are the same or different, and the average added mole number m and n are 0 to 40, where (m + n) represents 3 to 40. ].

［式（Ａ２）中のＲ_１は水素またはメチル基を表し、Ｒ_２およびＲ_７は同一または異なって、炭素数１から６のアルキレン基を表し、Ｒ_３およびＲ_５は同一または異なって、水素またはアルキル基を表し、Ｒ_４およびＲ_６は同一または異なって、水素、アルキル基、ベンジル基またはスチレン基を表し、Ｘはアニオン性親水基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］。

[R ₁ in Formula (A2) represents hydrogen or a methyl group, R ₂ and R ₇ are the same or different, represent an alkylene group having 1 to 6 carbon atoms, and R ₃ and R ₅ are the same or different, Represents hydrogen or an alkyl group, R ₄ and R ₆ are the same or different and represent hydrogen, an alkyl group, a benzyl group or a styrene group, X represents an anionic hydrophilic group, and the average number of added moles m and n are 0 to 40, where (m + n) represents a number from 3 to 40. ].

［式（Ａ３）中のＲ_１は水素またはメチル基を表し、Ｒ_２は炭素数１から６のアルキレン基を表し、Ｘはアニオン性親水基を表し、平均付加モル数ｎは３〜４０の数を表す。］。

[R ₁ in Formula (A3) represents hydrogen or a methyl group, R ₂ represents an alkylene group having 1 to 6 carbon atoms, X represents an anionic hydrophilic group, and the average number of added moles n is 3 to 40 Represents a number. ].

［式（Ａ４）中のＲ_１は水素またはメチル基を表し、Ｒ_２は炭素数１から３０の炭化水素基またはアシル基を表し、Ｒ_３およびＲ_４は同一または異なって、炭素数１から６のアルキレン基を表し、Ｘはアニオン性親水基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］。

[R ₁ in Formula (A4) represents hydrogen or a methyl group, R ₂ represents a hydrocarbon group or acyl group having 1 to 30 carbon atoms, and R ₃ and R ₄ may be the same or different, and 6 represents an alkylene group, X represents an anionic hydrophilic group, the average added mole number m and n are 0 to 40, and (m + n) represents a number of 3 to 40. ].

［式（Ａ５）中のＲ_１は炭化水素基、アミノ基、カルボン酸残基を表し、Ｒ_２は炭素数１から６のアルキレン基を表し、Ｘはアニオン性親水基を表し、平均付加モル数ｎは３〜４０の整数を表す。］。

[R ₁ in Formula (A5) represents a hydrocarbon group, an amino group, or a carboxylic acid residue, R ₂ represents an alkylene group having 1 to 6 carbon atoms, X represents an anionic hydrophilic group, and average added mole The number n represents an integer of 3 to 40. ].

［式（Ａ６）中のＲ_１は炭素数１から３０の炭化水素基、Ｒ_２は水素または炭素数１から３０の炭化水素基を表し、Ｒ_３は水素またはプロペニル基を表し、Ｒ_４は炭素数１から６のアルキレン基を表し、Ｘはアニオン性親水基を表し、平均付加モル数ｎは３〜４０の数を表す。］。

[In Formula (A6), R ₁ represents a hydrocarbon group having 1 to 30 carbon atoms, R ₂ represents hydrogen or a hydrocarbon group having 1 to 30 carbon atoms, R ₃ represents hydrogen or a propenyl group, and R ₄ represents An alkylene group having 1 to 6 carbon atoms is represented, X represents an anionic hydrophilic group, and the average added mole number n represents a number of 3 to 40. ].

［式（Ａ７）中のＲ_１は水素またはメチル基を表し、Ｒ_２およびＲ_４は同一または異なって、炭素数１から６のアルキレン基を表し、Ｒ_３は炭素数１から３０の炭化水素基を表し、Ｍは水素、アルカリ金属、アンモニウム基、またはアルカノールアンモニウム基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］。

[R ₁ in Formula (A7) represents hydrogen or a methyl group, R ₂ and R ₄ are the same or different and each represents an alkylene group having 1 to 6 carbon atoms, and R ₃ represents a hydrocarbon having 1 to 30 carbon atoms. Represents a group, M represents hydrogen, an alkali metal, an ammonium group, or an alkanol ammonium group, and the average number of added moles m and n is 0 to 40, where (m + n) represents a number of 3 to 40. ].

［式（Ａ８）中のＲ_１およびＲ_５は同一または異なって、水素またはメチル基を表し、Ｒ_２およびＲ_４は同一または異なって、炭素数１から６のアルキレン基を表し、Ｒ_３は炭素数１から３０の炭化水素基を表し、Ｍは水素、アルカリ金属、アンモニウム基、またはアルカノールアンモニウム基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］

[And _{R 1} and _{R 5} in the formula (A8) the same or different, represent a hydrogen or a methyl group, _{R 2} and _{R 4} are the same or different and each represents an alkylene group having a carbon number of 1 to 6, _{R 3} is Represents a hydrocarbon group having 1 to 30 carbon atoms, M represents hydrogen, an alkali metal, an ammonium group, or an alkanol ammonium group, and the average number of added moles m and n is 0 to 40, provided that (m + n) is 3 to 40 Represents a number. ]

［式（Ａ９）中のＲ_１は炭素数１から６のアルキレン基を表し、Ｒ_２は炭素数１から３０の炭化水素基を表し、Ｍは水素、アルカリ金属、アンモニウム基、またはアルカノールアンモニウム基を表し、平均付加モル数ｎは３〜４０の数を表す。］

[R ₁ in Formula (A9) represents an alkylene group having 1 to 6 carbon atoms, R ₂ represents a hydrocarbon group having 1 to 30 carbon atoms, and M represents hydrogen, an alkali metal, an ammonium group, or an alkanol ammonium group. The average added mole number n represents a number of 3 to 40. ]

［式（Ａ１０）中のＲ_１、Ｒ_２、およびＲ_３は同一または異なって、水素またはメチル基を表し、Ｒ_４は炭素数０から３０の炭化水素基（炭素数０の場合はＲ_４がないことを示す）を表し、Ｒ_５およびＲ_６は同一または異なって、炭素数１から６のアルキレン基を表し、Ｘはアニオン性親水基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］。

[R ₁ , R ₂ and R _{3 in} Formula (A10) are the same or different and represent hydrogen or a methyl group, and R ₄ represents a hydrocarbon group having 0 to 30 carbon atoms (in the case of 0 carbon atoms, R ₄ R ₅ and R ₆ are the same or different and each represents an alkylene group having 1 to 6 carbon atoms, X represents an anionic hydrophilic group, and average added mole numbers m and n are 0 to 40, where (m + n) represents a number from 3 to 40. ].

  X in the formulas (A1) to (A6) and (A10) represents an anionic hydrophilic group. Examples of the anionic hydrophilic group include those represented by the following formulas (a1) to (a2).

［式（ａ１）中のＭ_１は水素、アルカリ金属、アンモニウム基、またはアルカノールアンモニウム基を表す。］

[M ₁ in Formula (a1) represents hydrogen, an alkali metal, an ammonium group, or an alkanol ammonium group. ]

［式（ａ２）中のＭ_２およびＭ_３は同一または異なって、水素、アルカリ金属、アンモニウム基、またはアルカノールアンモニウム基を表す。］

[M ₂ and M _{3 in} Formula (a2) are the same or different and represent hydrogen, an alkali metal, an ammonium group, or an alkanol ammonium group. ]

  Examples of the nonionic reactive surfactant include those represented by the formulas (N1) to (N6).

［式（Ｎ１）中のＲ_１は水素またはメチル基を表し、Ｒ_２は炭素数１から３０の炭化水素基またはアシル基を表し、Ｒ_３およびＲ_４は同一または異なって、炭素数１から６のアルキレン基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］

[R ₁ in Formula (N1) represents hydrogen or a methyl group, R ₂ represents a hydrocarbon group or an acyl group having 1 to 30 carbon atoms, and R ₃ and R ₄ may be the same or different, and 6 represents an alkylene group, and average addition mole numbers m and n are 0 to 40, where (m + n) represents a number of 3 to 40. ]

［式（Ｎ２）中のＲ_１は水素またはメチル基を表し、Ｒ_２、Ｒ_３およびＲ_４は同一または異なって、炭素数１から６のアルキレン基を表し、平均付加モル数ｎ、ｍ、およびｌは０〜４０であって、（ｎ＋ｍ＋ｌ）が３〜４０となる数を表す。］

[R ₁ in Formula (N2) represents hydrogen or a methyl group, R ₂ , R ₃ and R ₄ are the same or different and each represents an alkylene group having 1 to 6 carbon atoms, and the average number of added moles n, m, And l represents 0 to 40, and (n + m + 1) represents a number from 3 to 40. ]

［式（Ｎ３）中のＲ_１は水素またはメチル基を表し、Ｒ_２およびＲ_３は同一または異なって、炭素数１から６のアルキレン基を表し、Ｒ_４は炭素数１から３０の炭化水素基またはアシル基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］

[R ₁ in Formula (N3) represents hydrogen or a methyl group, R ₂ and R ₃ are the same or different and each represents an alkylene group having 1 to 6 carbon atoms, and R ₄ represents a hydrocarbon having 1 to 30 carbon atoms. A group or an acyl group, the average number of added moles m and n is 0 to 40, where (m + n) represents a number of 3 to 40. ]

［式（Ｎ４）中のＲ_１およびＲ_２は同一または異なって、炭素数１から３０の炭化水素基を表し、Ｒ_３は水素またはプロペニル基を表し、Ｒ_４は炭素数１から６のアルキレン基を表し、平均付加モル数ｎは３〜４０の数を表す。］

[R ₁ and R _{2 in} formula (N4) are the same or different and each represents a hydrocarbon group having 1 to 30 carbon atoms, R ₃ represents hydrogen or a propenyl group, and R ₄ represents an alkylene having 1 to 6 carbon atoms Represents the group, and the average addition mole number n represents a number of 3 to 40. ]

［式（Ｎ５）中のＲ_１およびＲ_３は同一または異なって、炭素数１から６のアルキレン基を表し、Ｒ_２およびＲ_４は同一または異なって、水素、炭素数１から３０の炭化水素基、またはアシル基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］

[In formula (N5), R ₁ and R ₃ are the same or different and each represents an alkylene group having 1 to 6 carbon atoms; R ₂ and R ₄ are the same or different and represent hydrogen or a hydrocarbon having 1 to 30 carbon atoms; A group or an acyl group, and the average addition mole numbers m and n are 0 to 40, where (m + n) represents a number of 3 to 40. ]

［式（Ｎ６）中のＲ_１、Ｒ_２、およびＲ_３は同一または異なって、水素またはメチル基を表し、Ｒ_４は炭素数０から３０の炭化水素基（炭素数０の場合はＲ_４がないことを示す）を表し、Ｒ_５およびＲ_６は同一または異なって、炭素数１から６のアルキレン基を表し、平均付加モル数ｍおよびｎは０〜４０、ただし（ｍ＋ｎ）は３〜４０の数を表す。］

[R ₁ , R ₂ and R _{3 in} Formula (N6) are the same or different and represent hydrogen or a methyl group, and R ₄ represents a hydrocarbon group having 0 to 30 carbon atoms (in the case of 0 carbon atoms, R ₄ R ₅ and R ₆ are the same or different and each represents an alkylene group having 1 to 6 carbon atoms, and the average added mole numbers m and n are 0 to 40, provided that (m + n) is 3 to 3. The number of 40 is represented. ]

  The number average molecular weight (Mn) of the polyether compound is suitably 50000 or less, preferably 200 to 30000, more preferably 200 to 10000, and usually 200 to 5000 is suitably used. . When Mn is larger than 50000, compatibility with the (meth) acrylic polymer as the base polymer is lowered, and the pressure-sensitive adhesive layer tends to be whitened. If Mn is less than 200, contamination with the polyether compound may easily occur. In addition, Mn means the value of polystyrene conversion obtained by gel permeation chromatography (GPC) here.

  Specific examples of commercially available polyether compounds include, for example, Adeka Pluronic 17R-4, Adeka Pluronic 25R-1, Adeka Pluronic 25R-2, Adeka Pluronic L-23, Adeka Pluronic LER-10, Adekalia Soap NE-10 (all are manufactured by ADEKA), Emulgen 120, Latemul PD-420, Latemul PD-430 (all are manufactured by Kao Corporation), Surfynol 420, Surfynol 485 (all are Nissin) Chemical Company), Aqualon HS-10: Hightenol N-08, Neugen XL-40, Anti-Floss M-9, Epan 410, Aqualon KH-10, Aqualon RN-20, Hightenol NF-08, Plysurf A212C, (The above are all manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), PEG40 0, PEG600, New Pole PE-34, Sanniks PP200 (all are manufactured by Sanyo Chemical Co., Ltd.), Blemmer PME-400, Blemmer PME-1000, Blemmer 50POEP-800B (all are manufactured by NOF Corporation), etc. Can be mentioned.

  As a compounding quantity of the said polyether compound, it contains 0.03-14 mass parts with respect to 100 mass parts of said (meth) acrylic-type polymers, Preferably it is 0.04-13 mass parts, More preferably 0.05 to 12 parts by mass, most preferably 0.05 to 10 parts by mass. If the blending amount is too small, it is not possible to obtain an appropriate antistatic property (antistatic effect), and it may be impossible to ensure wettability with respect to the interlayer filler on the surface of the adherend after peeling off the surface protective film. . On the other hand, when the amount is too large, contamination with the polyether compound may easily occur.

<Antistatic component>
In the surface protective film of the present invention, the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer can contain an antistatic component, and can contain an ionic compound as the antistatic component. Examples of the ionic compound include alkali metal salts and / or ionic liquids. By containing these ionic compounds, excellent antistatic properties can be imparted. The pressure-sensitive adhesive layer (using the antistatic component) formed by crosslinking the pressure-sensitive adhesive composition containing the antistatic component as described above is an adherend that is not antistatic when peeled (for example, a polarizing plate ), And a surface protective film with reduced contamination on the adherend is obtained. For this reason, it becomes very useful as an antistatic surface protective film in a technical field related to optical and electronic components in which charging and contamination are particularly serious problems.

<Crosslinking agent>
In the surface protective film of the present invention, the pressure-sensitive adhesive composition preferably contains a crosslinking agent. Moreover, in this invention, it can be set as an adhesive layer using the said adhesive composition. For example, a surface protective film (adhesive layer) with more excellent heat resistance can be obtained by appropriately adjusting the structural unit, structural ratio, selection of crosslinking agent and addition ratio of the (meth) acrylic polymer, and crosslinking. be able to.

  As the crosslinking agent used in the present invention, an isocyanate compound, an epoxy compound, a melamine resin, an aziridine derivative, a metal chelate compound, or the like may be used. In particular, the use of an isocyanate compound is a preferred embodiment. Moreover, these compounds may be used independently and may be used in mixture of 2 or more types.

  Examples of the isocyanate compound include aliphatic polyisocyanates such as trimethylene diisocyanate, butylene diisocyanate, hexamethylene diisocyanate (HDI), and dimer acid diisocyanate, and fats such as cyclopentylene diisocyanate, cyclohexylene diisocyanate, and isophorone diisocyanate (IPDI). Aromatic isocyanates such as cyclic isocyanates, 2,4-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate (XDI), allophanate bonds, biuret bonds, isocyanurate bonds, uretdione bonds to the isocyanate compounds. , Urea bond, carbodiimide bond, uretonimine bond, oxadiazinetrione bond, etc. More denatured polyisocynate modified products thereof. For example, as commercial products, the product names Takenate 300S, Takenate 500, Takenate D165N, Takenate D178N (above, Takeda Pharmaceutical Co., Ltd.), Sumijoule T80, Sumijoule L, Death Module N3400 (above, Sumika Bayer Urethane Co., Ltd.) Millionate MR, Millionate MT, Coronate L, Coronate HL, Coronate HX (above, manufactured by Nippon Polyurethane Industry Co., Ltd.) and the like. These isocyanate compounds may be used alone, or may be used in combination of two or more, and a bifunctional isocyanate compound and a trifunctional or higher isocyanate compound may be used in combination. By using a cross-linking agent in combination, it becomes possible to achieve both tackiness and resilience resistance (adhesiveness to a curved surface), and a surface protective film with better adhesion reliability can be obtained.

  Examples of the epoxy compound include N, N, N ′, N′-tetraglycidyl-m-xylenediamine (trade name: TETRAD-X, manufactured by Mitsubishi Gas Chemical Company) and 1,3-bis (N, N-dioxy). Glycidylaminomethyl) cyclohexane (trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Company, Inc.).

  Examples of the melamine resin include hexamethylol melamine. Examples of the aziridine derivative include commercially available product names HDU, TAZM, TAZO (manufactured by Mutual Yakugyo Co., Ltd.) and the like.

  Examples of the metal chelate compound include aluminum, iron, tin, titanium, and nickel as metal components, and acetylene, methyl acetoacetate, and ethyl lactate as chelate components.

  The content of the crosslinking agent used in the present invention is, for example, preferably 0.01 to 10 parts by mass, and 0.1 to 8 parts by mass with respect to 100 parts by mass of the (meth) acrylic polymer. It is more preferably contained, more preferably 0.5 to 6 parts by mass, and most preferably 1 to 5 parts by mass. When the content is less than 0.01 parts by mass, the crosslinking formation by the crosslinking agent becomes insufficient, the cohesive force of the resulting pressure-sensitive adhesive layer becomes small, and sufficient heat resistance may not be obtained, It tends to cause glue residue. On the other hand, when the content exceeds 10 parts by mass, the cohesive force of the polymer is large, the fluidity is lowered, the wettability to the adherend (for example, polarizing plate) becomes insufficient, and the adherend and the pressure-sensitive adhesive. There is a tendency to cause blisters generated between the layer (adhesive composition layer). Furthermore, when the amount of the crosslinking agent is large, the peeling charging property tends to be lowered.

<Crosslinking catalyst>
The pressure-sensitive adhesive composition may further contain a cross-linking catalyst for causing any of the above-described cross-linking reactions to proceed more effectively. Examples of such crosslinking catalysts include tin catalysts such as dibutyltin dilaurate and dioctyltin dilaurate, tris (acetylacetonato) iron, tris (hexane-2,4-dionato) iron, and tris (heptane-2,4-dionato). Iron, tris (heptane-3,5-dionato) iron, tris (5-methylhexane-2,4-dionato) iron, tris (octane-2,4-dionato) iron, tris (6-methylheptane-2, 4-Dionato) iron, tris (2,6-dimethylheptane-3,5-dionato) iron, tris (nonane-2,4-dionato) iron, tris (nonane-4,6-dionato) iron, tris (2 , 2,6,6-tetramethylheptane-3,5-dionato) iron, tris (tridecan-6,8-dionato) iron, tris (1-phenylbutane-1,3) Diato) iron, tris (hexafluoroacetylacetonato) iron, tris (ethyl acetoacetate) iron, tris (acetoacetate-n-propyl) iron, tris (isopropyl acetoacetate) iron, tris (acetoacetate-n-butyl) Iron, tris (acetoacetate-sec-butyl) iron, tris (acetoacetate-tert-butyl) iron, tris (methyl propionylacetate) iron, tris (ethyl propionylacetate) iron, tris (propionylacetate-n-propyl) iron , Tris (propionyl acetate-isopropyl) iron, tris (propionyl acetate-n-butyl) iron, tris (propionyl acetate-sec-butyl) iron, tris (propionyl acetate-tert-butyl) iron, tris (benzyl acetoacetate) iron, Tris (dimethyl malonate) iron, tris (diethyl malonate) iron, trimethoxy iron, Iron-based catalysts such as triethoxy iron, triisopropoxy iron, and ferric chloride can be used. These crosslinking catalysts may be used alone or in combination of two or more.

  The content (use amount) of the crosslinking catalyst is not particularly limited, but is preferably 0.0001 to 1 part by mass, for example, 0.001 to 0.5 part per 100 parts by mass of the (meth) acrylic polymer. Part by mass is more preferable. Within the above range, when the pressure-sensitive adhesive layer is formed, the speed of the crosslinking reaction is increased, which is a preferred embodiment.

<Crosslinking retarder>
The pressure-sensitive adhesive composition may further contain a crosslinking retarder. The crosslinking retarder is not particularly limited. For example, β-ketoester such as methyl acetoacetate, ethyl acetoacetate, octyl acetoacetate, oleyl acetoacetate, lauryl acetoacetate, stearyl acetoacetate, acetylacetone, 2,4- Examples include β-diketones such as hexanedione and benzoylacetone. Among them, acetylacetone can be used. The crosslinking retarder can be used alone or in combination of two or more.

  Although content (usage amount) of the said crosslinking retarder is not specifically limited, For example, 0.1-10 mass parts is preferable with respect to 100 mass parts (when converted into), 0.1-5 mass parts Part is more preferred. When it is in the above range, the pot life of the pressure-sensitive adhesive can be extended, which is a preferred embodiment.

  The pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer of the present invention may further contain a solvent. As said solvent, the solvent used for the above-mentioned solution polymerization method is mentioned, for example. The solvent in the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer of the present invention may be the same as or different from the solvent used in the solution polymerization method. The solvent in the adhesive composition which forms the adhesive layer of this invention can be used individually or in combination of 2 or more types.

  Furthermore, the pressure-sensitive adhesive composition may contain other known additives, such as powders such as colorants and pigments, surfactants, plasticizers, tackifiers, low molecular weight polymers, Surface lubricants, leveling agents, antioxidants, corrosion inhibitors, light stabilizers, UV absorbers, polymerization inhibitors, silane coupling agents, inorganic or organic fillers, metal powders, particles, foils, etc. Can be added as appropriate according to the intended use.

<Adhesive layer / surface protective film>
The surface protective film for a touch panel of the present invention is formed by forming the pressure-sensitive adhesive layer on the second surface of the base material from the pressure-sensitive adhesive composition. Although it is generally performed after application of the pressure-sensitive adhesive composition, it is also possible to transfer a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition after crosslinking to a substrate or the like.

  The method for forming the pressure-sensitive adhesive layer on the base material is not particularly limited. For example, the pressure-sensitive adhesive layer is applied to the base material by applying the pressure-sensitive adhesive composition (solution) to the base material and drying and removing the polymerization solvent. It is produced by forming on top. Thereafter, curing may be performed for the purpose of adjusting the component transfer of the pressure-sensitive adhesive layer or adjusting the crosslinking reaction. Moreover, when producing a surface protective film by applying the pressure-sensitive adhesive composition on the substrate, one or more solvents other than the polymerization solvent are added to the pressure-sensitive adhesive composition so that the surface-protective film can be uniformly applied on the substrate. You may add a new one.

  Moreover, as a formation method of the adhesive layer at the time of manufacturing the surface protection film of this invention, the well-known method used for manufacture of adhesive tapes is used. Specific examples include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, extrusion coating using a die coater, and the like.

  The surface protective film of the present invention is usually produced so that the pressure-sensitive adhesive layer has a thickness of 3 to 100 μm, preferably about 5 to 50 μm. It is preferable for the thickness of the pressure-sensitive adhesive layer to be within the above range because it is easy to obtain an appropriate balance between removability and adhesiveness.

  The surface protective film of the present invention preferably has a total thickness of 1 to 400 μm, more preferably 10 to 200 μm, and still more preferably 20 to 100 μm. Within the above range, the adhesive properties (removability, adhesiveness, etc.), workability, and appearance properties are excellent and a preferred embodiment is obtained. In addition, the said total thickness means the sum total of the thickness containing all layers, such as a base material, an adhesive layer, and an antistatic layer.

<Separator>
In the surface protective film of the present invention, a separator can be bonded to the surface of the pressure-sensitive adhesive layer for the purpose of protecting the pressure-sensitive adhesive surface as necessary.

  Examples of the material constituting the separator include paper and plastic film, and a plastic film is preferably used from the viewpoint of excellent surface smoothness. The film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer. For example, polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer Examples thereof include a coalesced film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.

  The thickness of the separator is usually about 5 to 200 μm, preferably about 10 to 100 μm. It is preferable for it to be in the above-mentioned range since it is excellent in workability for bonding to the pressure-sensitive adhesive layer and workability for peeling from the pressure-sensitive adhesive layer. For the separator, if necessary, mold release and antifouling treatment with a silicone type, fluorine type, long chain alkyl type or fatty acid amide type release agent, silica powder, etc., coating type, kneading type, vapor deposition type It is also possible to carry out antistatic treatment such as.

<Optical member>
The optical member mounted on the touch panel of the present invention is preferably protected by the surface protective film for touch panel. The surface protective film has excellent antistatic properties and stability over time of the stripping voltage, can confirm the operation of the touch panel, and has excellent wettability to the interlayer filler on the surface of the adherend after the surface protective film is peeled off. It can be used for surface protection applications (surface protective film) during processing, transportation, shipping inspection, etc., and is useful for protecting the surface of the optical member (such as a polarizing plate mounted on a touch panel). In particular, since it can be used for plastic products and the like that are likely to generate static electricity, it is very useful for antistatic applications in the technical fields related to optical and electronic parts where charging is a particularly serious problem.

  Hereinafter, several examples related to the present invention will be described, but the present invention is not intended to be limited to those shown in the specific examples. In the following description, “part” and “%” are based on mass unless otherwise specified. Further, the blending amount (addition amount) in the table indicates the solid content or the solid content ratio.

  Each characteristic in the following description was measured or evaluated as follows.

<Measurement of weight average molecular weight (Mw)>
The weight average molecular weight (Mw) was measured using a GPC apparatus (HLC-8220GPC) manufactured by Tosoh Corporation. The measurement conditions are as follows.

Sample concentration: 0.2% by mass (THF solution)
Sample injection volume: 10 μl
Eluent: THF
Flow rate: 0.6 ml / min
Measurement temperature: 40 ° C
column:
Sample column; TSKguardcolumn SuperHZ-H (1) + TSKgel SuperHZM-H (2)
Reference column; TSKgel SuperH-RC (1)
Detector: Differential refractometer (RI)
The weight average molecular weight was determined in terms of polystyrene.

<Glass transition temperature (Tg)>
The glass transition temperature Tg (° C.) was determined by the following formula using the following literature values as the glass transition temperature Tgn (° C.) of the homopolymer of each monomer.
Formula: 1 / (Tg + 273) = Σ [Wn / (Tgn + 273)]
[Wherein, Tg (° C.) is the glass transition temperature of the copolymer, Wn (−) is the weight fraction of each monomer, Tgn (° C.) is the glass transition temperature of the homopolymer of each monomer, and n is the type of each monomer Represents. ]
Literature values:
2-ethylhexyl acrylate (2EHA): -70 ° C
2-Hydroxyethyl acrylate (HEA): -15 ° C
4-hydroxybutyl acrylate (4HBA): -32 ° C
Acrylic acid (AA): 106 ° C

  As reference values, “Synthesis / design of acrylic resin and development of new applications” (published by Central Management Development Center Publishing Department) and “Polymer Handbook” (John Wiley & Sons) were referred to.

<Measurement of surface resistance value>
Measurement was performed in accordance with JIS-K-6911 using a resistivity meter (manufactured by Mitsubishi Chemical Analytic, Hiresta UP MCP-HT450 type) in an atmosphere of temperature 23 ° C. and humidity 50% RH.
The surface resistance value (Ω / □) in the present invention is preferably 1.0 × 10 both at the initial stage and when allowed to stand at room temperature (23 ° C. × 50% RH) × 1 week (7 days). ⁷ or more and less than 1.0 × 10 ¹¹ , more preferably 1.0 × 10 ⁸ or more and less than 5.0 × 10 ¹⁰ , and still more preferably 1.0 × 10 ⁹ or more and 2.0 × 10 ^10. Is less than. A surface protective film exhibiting a surface resistance value within the above range can be suitably used as a surface protective film used in the processing or transporting of articles that dislike static electricity such as liquid crystal cells and semiconductor devices. Further, the surface protective film showing the surface resistance value within the above range can be confirmed even when the polarizing plate is mounted above the touch panel sensor and the surface protective film is stuck on the polarizing plate. Can be useful.

<Touch panel operation check>
Using iPhone 5s (manufactured by Apple) equipped with an in-cell touch panel, the operation of the touch panel was evaluated. First, the surface protection film was stuck on the screen of iPhone 5s, and when the screen was traced with a finger, the touch panel reacted or was observed visually to confirm the operability.
○: When the touch panel reacts accurately.
X: When the touch panel does not react correctly.

<Water contact angle>
After a surface protective film is attached to the surface of the adherend (hard coat film) at a temperature of 23 ° C. and a humidity of 50%, it is placed in an autoclave and processed under conditions of a temperature of 50 ° C., a pressure of 5 atm, and a time of 15 minutes. Then, it was left to stand at a temperature of 23 ° C. and a humidity of 50% for 12 hours to peel off. Using a water contact angle measuring device (trade name “DM700”, manufactured by Kyowa Interface Chemical Co., Ltd.), an adherend to which a surface protective film was attached in an atmosphere of a temperature of 23 ° C. and a humidity of 50% RH by a liquid suitable method. About 2.8 μL of water droplets were dropped on the surface, and the angle formed by the tangent line between the adherend surface and the end of the dropped water droplet 1 second after the dropping was measured to obtain the “water contact angle (°)”. The case where the water contact angle was 35 ° or less was evaluated as “(Wettability) good (◯)”, and the case where the water contact angle was greater than 35 ° was evaluated as “(Wettability) poor (×)”.
In addition, the water contact angle of the to-be-adhered body which did not process anything was 37.2 degrees. That is, the adherend used in this evaluation is a triacetyl cellulose film having a water contact angle of 37.2 °.

<Wettability of interlayer filler>
After the surface protective film is attached to the surface of the adherend at a temperature of 23 ° C. and a humidity of 50%, it is put into an autoclave and treated under conditions of a temperature of 50 ° C., a pressure of 5 atm, and a time of 15 minutes to adhere to the surface. It was allowed to stand at 23 ° C. and 50% humidity for 12 hours. Thereafter, the adherend to which the surface protective film was attached was cut out to a length of 40 mm and a width of 40 mm, and attached to a glass plate having a length of 50 mm and a width of 50 mm, and the glass plate was attached to a spin coater (trade name “K-359SD1”). , Manufactured by Kyowa Riken Co., Ltd.). Thereafter, the surface protective film is peeled off from the adherend, and 4 ml of a trade name “SVR7000 series” (manufactured by Dexerials) is applied as an interlayer filler to the adherend surface to which the surface protective film has been applied. Rotated to evenly stretch the interlayer filler. After standing at a temperature of 23 ° C. and a humidity of 50% for 1 hour, the distance at which the interlayer filler was repelled from the edge of the adherend was measured with a ruler.
Moreover, the same measurement was performed using a brand name "WORD ROCK HRJ-21" (made by Kyoritsu Chemical Industry Co., Ltd.) as an interlayer filler.
When using the interlayer fillers of “SVR7000 series” and “WORD ROCK HRJ-21”, when the distance repelled from the edge is shorter than 2 mm, “good (◯)”, either one or both interlayers When the filler was used, the case where the distance from the edge was 2 mm or more was evaluated as “defective (×)”. The adherend used in this evaluation is the same as the adherend used in the “water contact angle” evaluation.

<Measurement of polarizing plate peeling voltage (polarizing plate side)>
After the surface protective film 1 according to each example was cut to a size of 70 mm in width and 130 mm in length and the release liner was peeled off, as shown in FIG. 3, the acrylic plate 10 (Mitsubishi Rayon Co., Ltd. On the surface of the polarizing plate 20 (manufactured by Nitto Denko Corporation, SEG1423DU polarizing plate, width: 70 mm, length: 100 mm) bonded to the product name “Acrylite”, thickness: 1 mm, width: 70 mm, length: 100 mm, The surface protective film 1 was pressure-bonded with a hand roller so that one end of the surface protective film 1 protruded 30 mm from the end of the polarizing plate 20.
The sample was left in an environment of 23 ° C. × 50% RH for one day, and then set at a predetermined position on a sample fixing base 30 having a height of 20 mm. The end of the surface protective film 1 that protruded 30 mm from the polarizing plate 20 was fixed to an automatic winder (not shown), and was peeled so that the peeling angle was 150 ° and the peeling speed was 10 m / min. The potential measuring device 40 (model “KSD-0103” manufactured by Kasuga Denki Co., Ltd.) in which the potential of the adherend (polarizing plate) surface generated at this time is fixed at a position 100 mm in height from the center of the polarizing plate 20. The “initial polarizing plate stripping voltage” was measured. The measurement was performed in an environment of 23 ° C. and 50% RH.
Further, after being allowed to stand in an environment of 23 ° C. × 50% RH for 1 week (7 days), the “polarizing plate peeling band voltage with time” was measured in the same manner as the “initial polarizing plate peeling band voltage”. The measurement was performed in an environment of 23 ° C. × 50% RH.
The polarizing plate peeling voltage is a peeling voltage derived from the antistatic layer and the pressure-sensitive adhesive layer constituting the surface protective film of the present invention, and contributes to antistatic properties.
The polarizing plate peeling voltage (kV) (both absolute value, initial and time) in the present invention is preferably 1.8 kV or less, more preferably 1.7 kV or less, still more preferably 1. 6 kV or less. Within the above range, for example, damage to a liquid crystal driver or the like can be prevented, which is a preferable mode.

<Contamination of polarizing plate>
The surface protective film was cut into a size of 50 mm in width and 80 mm in length together with the release liner, and the release liner was removed to expose the adhesive surface. The pressure-sensitive adhesive surface was pressure-bonded to a polarizing plate (manufactured by Nitto Denko Corporation, SEG1423DU polarizing plate) with a hand roller. This was left for 1 week in an environment of 23 ° C. × 50% RH, and then the surface protective film was peeled off from the adherend by hand. After peeling, the surface of the adherend is illuminated under a bright place (normal indoor environment with a fluorescent lamp on the ceiling) and under a dark room fluorescent lamp (external light is blocked by a light-shielding curtain, and only the desktop fluorescent lamp is used as the illumination) The environment was visually observed and the contamination state was evaluated. The evaluation criteria are as follows.
○: When no contamination was observed in the light.
×: When contamination is observed in a bright place.

<Preparation of acrylic polymer (A) for pressure-sensitive adhesive layer>
In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a condenser, 100 parts by mass of 2-ethylhexyl acrylate (2EHA), 4 parts by mass of 2-hydroxyethyl acrylate (HEA), 2 as a polymerization initiator , 2'-azobisisobutyronitrile and 157 parts by weight of ethyl acetate were charged, nitrogen gas was introduced while gently stirring, and the temperature in the flask was kept at around 65 ° C for 6 hours of polymerization. Reaction was performed and the acrylic polymer (A) solution (40 mass%) was prepared. The acrylic polymer (A) had a weight average molecular weight of 540,000 and a glass transition temperature (Tg) of −68 ° C.

<Preparation of acrylic polymer (B) for pressure-sensitive adhesive layer>
In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a condenser, 100 parts by mass of 2-ethylhexyl acrylate (2EHA), 10 parts by mass of 4-hydroxybutyl acrylate (4HBA), acrylic acid (AA) 0.02 parts by mass, 0.22 parts by mass of 2,2′-azobisisobutyronitrile and 157 parts by mass of ethyl acetate as a polymerization initiator were charged, nitrogen gas was introduced while gently stirring, and the liquid in the flask A polymerization reaction was carried out for 6 hours while maintaining the temperature at around 65 ° C. to prepare an acrylic polymer (B) solution (40% by mass). The acrylic polymer (B) had a weight average molecular weight of 540,000 and a glass transition temperature (Tg) of −67 ° C.

<Preparation of aqueous solution for antistatic layer (C)>
Polyester resin Vylonal MD-1480 (25% aqueous solution, manufactured by Toyobo Co., Ltd.) as a binder, polyaniline sulfonic acid (aquapass, weight average molecular weight 40,000, manufactured by Mitsubishi Rayon Co.) as a conductive polymer, and hexamethylene blocked with diisopropylamine as a crosslinking agent Isocyanurate of diisocyanate, lubricant, oleic amide in water / ethanol (1/3) mixed solvent, binder in solid content of 100 parts by mass, conductive polymer in solid content of 75 parts by mass, and crosslinker in solid form 10 parts by weight and 30 parts by weight of solid lubricant were added and stirred for about 20 minutes to mix thoroughly. In this way, an aqueous solution for antistatic layer (C) having an NV of about 0.4% was prepared.

<Preparation of aqueous solution for antistatic layer (D)>
Polyester resin Vylonal MD-1480 (25% aqueous solution, manufactured by Toyobo Co., Ltd.) as the binder, poly (3,4-ethylenedioxythiophene) (PEDOT) 0.5% and polystyrene sulfonate (weight average molecular weight 150,000) as the conductive polymer (PSS) 0.8% aqueous solution (Bytron P, manufactured by HC Stark Co.) in a water / ethanol (1/1) mixed solvent, 100 parts by mass of binder in solid content, and conductive polymer 50 parts by mass of solid content and 2.5 parts by mass of melamine-based crosslinking agent were added, and the mixture was stirred for about 20 minutes and mixed well. In this way, an aqueous solution for antistatic layer (D) having an NV of about 0.4% was prepared.

<Preparation of base material with antistatic layer>
The antistatic layer (C) is applied to the corona-treated surface of a transparent polyethylene terephthalate (PET) film (polyester film) having a thickness of 38 μm, a width of 30 cm, and a length of 40 cm. ) Or (D) was applied so that the thickness after drying was 30 nm or 50 nm. This coated material was heated to 130 ° C. for 1 minute and dried to prepare a base material with an antistatic layer having an antistatic layer on the first surface of the PET film.

<Example 1>
[Preparation of acrylic adhesive solution]
The acrylic polymer (A) solution (40% by mass) is diluted to 20% by mass with ethyl acetate, and the isocyanurate of hexamethylene diisocyanate (as a crosslinking agent) is added to 500 parts by mass of this solution (solid content: 100 parts by mass). Nippon Polyurethane Industry Co., Ltd., Coronate HX) 3 parts by mass (solid content 3 parts by mass), 3 parts by mass of dibutyltin dilaurate (trade name: OL-1, manufactured by Tokyo Fine Chemicals) (1% by mass ethyl acetate solution) as a crosslinking catalyst Parts (solid content: 0.03 parts by mass), 3 parts by mass with respect to 100 parts by mass of acetylacetone (when converted) as a crosslinking retarder, and polyethylene glycol (trade name: PEG400, number) as a polyether compound (Average molecular weight: 400, manufactured by Sanyo Chemical Co., Ltd.) Add 0.05 parts by mass, mix and stir to prepare an acrylic adhesive solution .

[Production of surface protective film]
The acrylic pressure-sensitive adhesive solution was applied to the surface opposite to the antistatic layer of the base material having the antistatic layer (base material with antistatic layer), heated at 130 ° C. for 1 minute, and a thickness of 15 μm. An adhesive layer was formed. Next, the surface of the pressure-sensitive adhesive layer was bonded with a silicone-treated surface of a polyethylene terephthalate film (thickness: 25 μm), which is a separator with a silicone treatment on one side, to produce a surface protective film for a touch panel.

<Examples 2 to 10 and Comparative Examples 1 to 4>
Based on the contents of Tables 1 to 3, surface protective films were produced in the same manner as in Example 1.

  Tables 4 and 5 show the results of various measurements and evaluations described above for the surface protective films according to Examples and Comparative Examples.

The abbreviations in Table 1 and Table 3 will be described below.
2EHA: 2-ethylhexyl acrylate HEA: 2-hydroxyethyl acrylate 4HBA: 4-hydroxybutyl acrylate AA: acrylic acid (AA)
Adeka Pluronic 25R-1: Polyoxyethylene-polyoxypropylene block copolymer (manufactured by ADEKA, polyether compound)
Surfynol 420: 2,4,7,9-tetramethyl-5-decyne-4,7-diol polyether product (manufactured by Nissin Chemical Co., polyether compound)
Surfynol 485: polyether product of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (manufactured by Nissin Chemical Co., polyether compound)
Aqualon HS-10: Ammonium polyoxyethylene nonylpropenyl phenyl ether sulfate (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., polyether compound)
Laterum PD-420: Polyoxyalkylene alkenyl ether (polyether compound, manufactured by Kao Corporation)
PEG400: Polyethylene glycol (number average molecular weight: 400, manufactured by Sanyo Chemical Industries, polyether compound)
PP200: Polypropylene glycol (number average molecular weight: 200, manufactured by Sanyo Chemical Industries, polyether compound)

  From the above evaluation results, it was confirmed that all the examples were excellent in antistatic property and stability over time of the stripping voltage, and were practical without any problem in confirming the operation of the touch panel. Moreover, it has confirmed that it was excellent also in wettability and contamination | pollution property by mix | blending a polyether compound with the specific ratio in the adhesive layer.

  On the other hand, in Comparative Example 1, since the polyether compound was not used, it was confirmed that the wettability was poor and the antistatic property was poor. In Comparative Example 2, it was confirmed that the antistatic property could not be obtained because the polyether compound was blended in an amount smaller than the desired ratio. In Comparative Example 3, since many polyether compounds were blended, it was confirmed that the contamination was poor. In Comparative Example 4, the use of a water-dispersed conductive polymer (PEDOT / PSS) as a component constituting the antistatic layer, the surface resistance value is too low, so that the operation of the touch panel cannot be confirmed and is practical. It was confirmed that it was not appropriate. It was also confirmed that the antistatic property and the stability over time of the stripping voltage were poor. Although the details of the reason for causing such a problem are not clear, it is presumed that the antistatic property deteriorated as a whole of the surface protective film based on the deterioration of the antistatic layer.

  The surface protective film disclosed herein is optical when manufacturing or transporting optical members such as polarizing plates used as components of liquid crystal display panels, plasma display panels (PDP), organic electroluminescence (EL) displays, and the like. It is suitable as a surface protective film for protecting the member. In particular, it is useful as a surface protective film (optical surface protective film) applied to an optical member such as a polarizing plate mounted on an on-cell or in-cell touch panel.

1: Surface protective film 3: Touch panel 10: Acrylic plate 20: Polarizing plate 30: Sample fixing base 40: Potential measuring device 11: Antistatic layer 12: Base material 13: Adhesive layer 31: Polarizing plate 32: Touch sensor 33: Base glass 34: Liquid crystal

Claims (6)

A base material having a first surface and a second surface, an antistatic layer provided on the first surface of the base material, and a pressure-sensitive adhesive layer formed from a pressure-sensitive adhesive composition on the second surface of the base material A surface protective film for a touch panel comprising:
The antistatic layer is formed from an antistatic agent composition containing polyaniline sulfonic acid as a conductive polymer component, a polyester resin as a binder , a fatty acid amide as a lubricant, and an isocyanate-based crosslinking agent as a crosslinking agent,
The lubricant does not contain wax;
The pressure-sensitive adhesive composition contains a (meth) acrylic polymer and a polyether compound,
The surface protective film for touchscreens which contains 0.03-14 mass parts of said polyether compounds with respect to 100 mass parts of said (meth) acrylic-type polymers. The surface protective film for a touch panel according to claim 1, wherein the substrate contains polyethylene terephthalate and / or polyethylene naphthalate. The polyether compound is, the surface protective film for a touch panel according to claim 1 or 2, characterized in that a surfactant. The surface resistance value (Ω / □) of the surface of the antistatic layer is 1.0 × 10 ⁷ 1.0 × 10 or more ¹¹ The surface protective film for a touch panel according to claim 1, wherein the surface protective film is a touch panel. An optical member mounted on a touch panel,
Light faculty member you wherein Tei Rukoto protected by a surface protective film for a touch panel according to claim 1. It is a manufacturing method of the surface protection film for touchscreens in any one of Claims 1-4,
Preparing an aqueous solution containing the antistatic agent composition;
Applying and drying the aqueous solution on the first surface of the substrate to prepare an antistatic layer, and a method for producing a surface protective film for a touch panel.

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