JP2019086788A - Antistatic surface protective film - Google Patents

Abstract

To provide an antistatic surface protective film which is less in contamination to an adherend and has excellent peeling antistatic performance without time degradation.SOLUTION: In an antistatic surface protective film, on one surface of a base material film 1, an adhesive layer 2 is formed which is formed of an acrylic polymer of a copolymer copolymerized with 1-30 pts.wt. of (a1) a (meth)acrylate monomer having 1 to 4 carbon atoms in an alkyl group, 70-99 pts.wt. of (a2) a (meth)acrylate monomer having 5 to 18 carbon atoms in an alkyl group and 0.1-12 pts.wt. of (B) a monomer that contains a hydroxyl group and is copolymerizable, further contains (C) a bifunctional or higher isocyanate compound, (D) a crosslinking accelerator and (E) a ketoenol tautomer, and is formed of an adhesive composition containing no antistatic agent, and a peeling film 5 in which a peeling agent layer 4 containing an antistatic agent is laminated on one surface of a resin film is stuck to the surface of the adhesive layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an antistatic surface protection film. More specifically, with regard to a method for producing an antistatic surface protective film having an antistatic performance, and an antistatic surface protective film, it has less contamination to an adherend and has excellent peeling antistatic performance without deterioration with time. Abstract: A method for producing an antistatic surface protective film, and an antistatic surface protective film.

Optical films such as polarizing plates, retardation plates, lens films for displays, antireflection films, hard coat films, transparent conductive films for touch panels, and optical products such as displays using the films The surface protective film is bonded to the surface of the optical film to prevent the surface from being soiled or damaged in a later step. The appearance inspection of an optical film which is a product may be performed with the surface protective film adhered to the optical film in order to peel off the surface protective film and to save labor for bonding again to enhance work efficiency.
Heretofore, a surface protective film provided with an adhesive layer on one side of a substrate film is generally used in order to prevent adhesion of scratches and dirt in the manufacturing process of an optical product. The surface protective film is bonded to the optical film through the pressure-sensitive adhesive layer with a slight adhesion. The pressure-sensitive adhesive layer has a slight adhesion because it can be easily peeled off when the used surface protective film is peeled off from the surface of the optical film, and the adhesive is an adherend. The purpose is to prevent the film from adhering and remaining on the optical film (so-called generation of adhesive residue).

In recent years, in the production process of liquid crystal display panels, for controlling the display screen of a liquid crystal display panel by a peeling charge voltage generated when the surface protection film bonded on the optical film is peeled and removed. The phenomenon that circuit components such as driver ICs are destroyed and the phenomenon that the alignment of liquid crystal molecules is damaged are occurring although the number of occurrence is small.
Further, in order to reduce the power consumption of the liquid crystal display panel, the driving voltage of the liquid crystal material is becoming lower, and accordingly, the breakdown voltage of the driver IC is also becoming lower. In recent years, it has been required to set the peeling voltage within the range of +0.7 kV to -0.7 kV.
For this reason, when peeling a surface protection film from the film for optics which is a to-be-adhered body, in order to prevent the problem by the peeling charge voltage being high, the adhesive layer containing the antistatic agent for restraining a peeling charge voltage low A surface protection film using a has been proposed.

For example, Patent Document 1 discloses a surface protection film using an adhesive comprising an alkyltrimethyl ammonium salt, a hydroxyl group-containing acrylic polymer, and a polyisocyanate.
Patent Document 2 discloses a pressure-sensitive adhesive composition comprising an ionic liquid and an acrylic polymer having an acid value of 1.0 or less, and a pressure-sensitive adhesive sheet using the same.
Further, Patent Document 3 discloses a pressure-sensitive adhesive composition comprising an acrylic polymer, a polyether polyol compound, an alkali metal salt treated with an anion adsorbing compound, and a surface protection film using the same.
Further, Patent Document 4 discloses a pressure-sensitive adhesive composition comprising an ionic liquid, an alkali metal salt, a polymer having a glass transition temperature of 0 ° C. or less, and a surface protection film using the same.
Patent Documents 5 and 6 show that polyether modified silicone is mixed in the adhesive layer of the surface protective film.

JP 2005-131957 A JP 2005-330464 A JP 2005-314476 A Unexamined-Japanese-Patent No. 2006-152235 JP, 2009-275128, A Patent No. 4537450 gazette

  In the above-mentioned Patent Documents 1 to 4, the antistatic agent is added to the inside of the pressure-sensitive adhesive layer, but as the thickness of the pressure-sensitive adhesive layer becomes thicker and as the elapsed time passes, the surface protective film is bonded With respect to the adherend, the amount of the antistatic agent transferred from the pressure-sensitive adhesive layer to the adherend is increased. Further, in the case of an optical film such as an LR (Low Reflective) polarizing plate or an AG (Anti Glare) -LR polarizing plate, the surface of the optical film is subjected to an antifouling treatment with a silicone compound or a fluorine compound. When the surface protective film used for the optical film is peeled from the optical film as the adherend, the peeling voltage is high.

  Moreover, when the polyether modified silicone is mixed in the adhesive layer of patent document 5, 6, it is difficult to finely adjust the adhesive force of a surface protection film. Moreover, since the polyether modified silicone is mixed in the pressure-sensitive adhesive layer, when the conditions for applying and drying the pressure-sensitive adhesive composition on the base film change, the pressure-sensitive adhesive layer on which the surface protective film was formed The characteristics of the surface change slightly. Furthermore, from the viewpoint of protecting the surface of the optical film, the thickness of the pressure-sensitive adhesive layer can not be made extremely thin. Therefore, according to the thickness of the pressure-sensitive adhesive layer, it is necessary to increase the addition amount of the polyether modified silicone mixed in the pressure-sensitive adhesive layer, and as a result, the adherend surface is easily contaminated, and the adhesive strength over time Contamination of the adherend changes.

  In recent years, with the spread of 3D displays (stereoscopic displays), there is one in which an FPR (Film Patterned Retarder) film is bonded to the surface of an optical film such as a polarizing plate. After peeling off the surface protection film bonded to the surface of the optical film such as a polarizing plate, the FPR film is bonded. However, if the surface of the optical film such as a polarizing plate is contaminated with the pressure-sensitive adhesive or antistatic agent used for the surface protective film, there is a problem that the FPR film is difficult to adhere. For this reason, the surface protection film used for the said application is required for the thing with little contamination with respect to a to-be-adhered body.

  On the other hand, in some liquid crystal panel manufacturers, the surface protective film bonded to an optical film such as a polarizing plate is peeled off once and mixed with air bubbles as a method for evaluating the contamination of the surface protective film to the adherend. The method of heat-processing what was re-bonded in a fixed state on predetermined conditions, and peeling off a surface protection film after that and observing the surface of a to-be-adhered body is employ | adopted. In such an evaluation method, even if the surface contamination of the adherend is very small, the difference in the surface contamination of the adherend between the portion mixed with air bubbles and the portion in contact with the adhesive of the surface protective film. Will remain as air bubble marks (sometimes called air bubbles). Therefore, it becomes a very severe evaluation method as an evaluation method of the contamination nature to the surface of a to-be-adhered body. In recent years, there has been a demand for a surface protection film having no problem in the contamination of the surface of an adherend even as a result of determination by such a severe evaluation method. However, in the surface protection film using the pressure-sensitive adhesive layer containing an antistatic agent, which has been conventionally proposed, it has been difficult to solve the problem.

  For this reason, there is a need for a surface protection film for use in an optical film, which has very little contamination to the adherend and does not change with time the contamination of the adherend. Furthermore, there is a demand for a surface protection film in which the peeling charging voltage when peeling from an adherend is suppressed low.

The present inventors diligently studied to solve this problem.
In order to reduce the contamination on the adherend and to reduce the time-dependent change of the antistatic performance, it is necessary to reduce the addition amount of the antistatic agent presumed to be the cause of the contamination of the adherend. However, when the amount of addition of the antistatic agent is decreased, the peeling charging voltage is increased when the surface protective film is peeled from the adherend. The inventors of the present invention examined a method for suppressing the peeling voltage drop when peeling the surface protection film from the adherend without increasing the absolute amount of the addition amount of the antistatic agent. As a result, the antistatic agent is not added and mixed in the pressure-sensitive adhesive composition to form the pressure-sensitive adhesive layer, but after the pressure-sensitive adhesive composition is applied and dried to laminate the pressure-sensitive adhesive layer, the pressure-sensitive adhesive The present invention has been found that, by applying an appropriate amount of an antistatic agent component to the surface of a layer, it is possible to suppress the peeling charge voltage low when peeling a surface protection film from an optical film as an adherend. Completed.

  The present invention has been made in view of the above circumstances, and is a method of producing an antistatic surface protective film having little peeling contamination to an adherend and having excellent peeling antistatic performance without deterioration with time, and charging. It is an object of the present invention to provide a protective surface protection film.

  In order to solve the above problems, the antistatic surface protective film of the present invention is applied and dried on a pressure-sensitive adhesive composition to laminate a pressure-sensitive adhesive layer, and then an appropriate amount of an antistatic agent is applied to the surface of the pressure-sensitive adhesive layer. The technical idea is to suppress the contamination of the adherend to a low level, and to suppress the peel voltage when peeling from the optical film as the adherend.

  In order to solve said subject, this invention is a manufacturing method of antistatic surface protection film, Comprising: Next step (1)-(3), process (1): Pressure-sensitive adhesive composition containing acrylic polymer The carbon number of the (a1) alkyl group is C1 to the total of 100 parts by weight of the (A) alkyl group, wherein the carbon number of the (A) alkyl group is C1 to C18. 1 to 30 parts by weight of at least one C4 (meth) acrylic acid ester monomer, and 70 to 99% by weight (a2) at least one C5 to C18 (meth) acrylic acid ester monomer having an alkyl group of C5 to C18 Acrylic polymer of a copolymer obtained by copolymerizing 1 part and at least one kind of a copolymerizable monomer containing (B) a hydroxyl group as a copolymerizable monomer group with 0.1 to 12 parts by weight The acrylic polymer does not contain a carboxyl group-containing copolymerizable monomer and a hydroxyl group-free nitrogen-containing vinyl monomer, and the pressure-sensitive adhesive composition further has (C) a bifunctional or higher functional group. A step of producing a pressure-sensitive adhesive composition containing an isocyanate compound, (D) a crosslinking accelerator, and (E) ketoenol tautomer compound, and a step (2): a substrate comprising a resin having transparency A step of forming a pressure-sensitive adhesive layer obtained by crosslinking the pressure-sensitive adhesive composition on one side of a film, and a step (3): a release agent layer containing an antistatic agent on one side of a resin film on the surface of the pressure-sensitive adhesive layer. Bonding the peelable film laminated with each other via the release agent layer, and transferring the antistatic agent of the release agent layer to the surface of the pressure-sensitive adhesive layer, the steps (1) to (3) In the order of) The release agent layer is formed of a resin composition containing a release agent containing dimethylpolysiloxane as a main component and an antistatic agent, and the pressure-sensitive adhesive layer is subjected to a low reflection surface treatment. After pasting to a polarizing plate, the peeling charge voltage at peeling is ± 0.6 kV or less, and the pressure-sensitive adhesive layer is stuck to a polarizing plate subjected to the low reflection surface treatment, and then peeled. The present invention provides a method for producing an antistatic surface protection film, which is characterized in that the stain resistance of the film is good.

  In the pressure-sensitive adhesive composition, a polyalkylene glycol mono (C) in which the average repeating number of the alkylene oxide constituting the (F) polyalkylene glycol chain is 3 to 14 and the diester content in the monomer is 0.2% or less It is preferred to contain a meta) acrylic ester monomer.

  The antistatic agent in the release agent layer is preferably an alkali metal salt.

  Moreover, in order to solve said subject, the adhesive layer which bridge | crosslinked the adhesive composition containing an acryl-type polymer is formed in the single side | surface of the base film which consists of resin which has transparency in this invention. It is an antistatic surface protection film, Comprising: The carbon number of the (A) alkyl group is a (A1) alkyl group with respect to a total of 100 weight part of (meth) acrylic acid ester monomers whose carbon number of the (A) alkyl group is C1-C18. 1 to 30 parts by weight of at least one kind of (meth) acrylic acid ester monomer having a carbon number of C1 to C4, and (a2) at least one kind of (meth) acrylic acid ester monomer having a carbon number of C5 to C18 of an alkyl group 70 to 99 parts by weight, and, as a group of copolymerizable monomers, (B) 0.1 to 12 parts by weight of at least one copolymerizable monomer containing a hydroxyl group The pressure-sensitive adhesive composition comprises an acrylic polymer of a polymerized copolymer, and the acrylic polymer does not contain a carboxyl group-containing copolymerizable monomer and a hydroxyl group-free nitrogen-containing vinyl monomer. Furthermore, it contains (C) a bifunctional or higher functional isocyanate compound, (D) a crosslinking accelerator, and (E) ketoenol tautomer compound, and the surface of the pressure-sensitive adhesive layer is a single side of a resin film. A release film in which a release agent layer containing an antistatic agent is laminated is laminated through the release agent layer, and the antistatic agent of the release agent layer is transferred to the surface of the pressure-sensitive adhesive layer. And the release agent layer is formed of a resin composition containing a release agent containing dimethylpolysiloxane as a main component, a silicone compound which is liquid at 20.degree. C., and an antistatic agent. Is made by, the pressure-sensitive adhesive layer, after pasting the polarizing plate low reflection surface-treated, to provide an antistatic surface protecting film in which contamination of when peeling, wherein the good.

  In the pressure-sensitive adhesive composition, furthermore, (F) a polyalkylene glycol chain is configured with respect to a total of 100 parts by weight of a (meth) acrylic acid ester monomer having a C1 to C18 alkyl group (C). 0 to 50 parts by weight of polyalkylene glycol mono (meth) acrylic acid ester monomer having an average repeating number of alkylene oxide of 3 to 14 and a diester content in the monomer of 0.2% or less Preferably).

  In addition, the (D) crosslinking accelerator is at least one selected from the group consisting of an aluminum chelate compound, a titanium chelate compound, and an iron chelate compound, and 0. 2 or less per 100 parts by weight of the acrylic polymer. It is 0.001 to 0.5 parts by weight, containing 0.1 to 300 parts by weight of the (E) keto-enol tautomer compound, and the ratio by weight of (E) / (D) is 70 to 1000. Is preferred.

  Further, the copolymerizable monomer containing a hydroxyl group (B) is 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate A) at least one selected from a group of compounds consisting of acrylate, N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-hydroxyethyl (meth) acrylamide, and said acrylic polymer The amount is preferably 0.1 to 10 parts by weight with respect to 100 parts by weight.

  In addition, as the (C) bifunctional or higher isocyanate compound, the bifunctional isocyanate compound is a compound produced by reacting a diisocyanate compound and a diol compound with a non-cyclic aliphatic isocyanate compound, and as a diisocyanate compound Is an aliphatic diisocyanate, which is a compound selected from the group consisting of tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate and 2-methyl- as a diol compound 1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2-ethyl-2-butyl-1,3-propane And one selected from a group of compounds consisting of 3-methyl-1,5-pentanediol, 2,2-dimethyl-1,3-propanediol monohydroxypivalate, polyethylene glycol and polypropylene glycol, As a trifunctional isocyanate compound, isocyanurate of hexamethylene diisocyanate, isocyanurate of isophorone diisocyanate, adduct of hexamethylene diisocyanate, adduct of isophorone diisocyanate, adduct of hexamethylene diisocyanate, biuret of hexamethylene diisocyanate, isophorone diisocyanate Burette, isocyanurate of tolylene diisocyanate compound, isocyanurate of xylylene diisocyanate compound, hydrogenated An isocyanurate of a silylene diisocyanate compound, an adduct of a tolylene diisocyanate compound, an adduct of a xylylene diisocyanate compound, an adduct of a hydrogenated xylylene diisocyanate compound, and 0.1 parts by weight based on 100 parts by weight of the acrylic polymer It is preferably 10 parts by weight.

  In the pressure-sensitive adhesive composition, a (H) polyether-modified siloxane compound having an HLB value of 7 to 15 is used in an amount of 1.0 part by weight or less (0 parts by weight) based on 100 parts by weight of the acrylic polymer. It is preferable to include.

  Moreover, it is preferable that the silicone type compound in the said release agent layer is polyether modified silicone.

  The antistatic agent in the release agent layer is preferably an alkali metal salt.

  The antistatic agent in the release agent layer is preferably a Li salt, and is preferably at least one selected from the group consisting of LiTFSI, LiFSI, and LiTF.

  The present invention also provides an optical film formed by laminating the above-described antistatic surface protective film.

  The present invention also provides an optical component formed by laminating the above-described antistatic surface protective film.

The antistatic surface protective film of the present invention causes little contamination to the adherend, and the low contamination to the adherend does not change with time. Further, according to the present invention, even when the surface of an adherend such as an LR polarizing plate or an AG-LR polarizing plate is an anti-pollution film treated with a silicone compound or a fluorine compound, etc. It is possible to suppress the peeling charging voltage generated when peeling the surface protective film from the adherend to a low level, and to provide an antistatic surface protective film having excellent peeling antistatic performance without deterioration with time.
According to the antistatic surface protective film of the present invention, since the surface of the optical film can be protected with certainty, productivity and yield can be improved.

It is sectional drawing which showed the concept of the antistatic surface protective film of this invention. It is sectional drawing which shows the state which peeled off the peeling film from the antistatic surface protective film of this invention. FIG. 2 is a cross-sectional view of one of the embodiments of the optical component of the present invention.

Hereinafter, the present invention will be described in detail based on the embodiments.
FIG. 1 is a cross-sectional view showing the concept of the antistatic surface protective film of the present invention. In the antistatic surface protective film 10, an adhesive layer 2 is formed on the surface of one side of a transparent base film 1. The release film 5 in which the release agent layer 4 is formed on the surface of the resin film 3 is bonded to the surface of the pressure-sensitive adhesive layer 2.

As the base film 1 used for the antistatic surface protection film 10 according to the present invention, a base film made of a resin having transparency and flexibility is used. Thereby, the appearance inspection of an optical component can be performed in the state which bonded the antistatic surface protection film to the optical component which is a to-be-adhered body. The film made of a resin having transparency used as the base film 1 is preferably a polyester film of polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, polybutylene terephthalate or the like. Besides polyester films, films made of other resins may be used as long as they have the required strength and optical suitability. The base film 1 may be a non-oriented film or a uniaxially or biaxially stretched film. In addition, the stretching ratio of the stretched film or the orientation angle in the axial direction formed along with the crystallization of the stretched film may be controlled to a specific value.
The thickness of the base film 1 used for the antistatic surface protective film 10 according to the present invention is not particularly limited, but for example, a thickness of about 12 to 100 μm is preferable, and a thickness of about 20 to 50 μm is easy to handle , More preferred.
In addition, on the surface of the base film 1 opposite to the surface on which the pressure-sensitive adhesive layer 2 is formed, an antifouling layer for preventing surface contamination, an antistatic layer, a scratch-resistant hard coat layer, etc. may be used. It can be provided. In addition, the surface of the base film 1 may be subjected to easy adhesion treatment such as surface modification by corona discharge and application of an anchor coating agent.

  In addition, the pressure-sensitive adhesive layer 2 used in the antistatic surface protective film 10 according to the present invention adheres to the surface of the adherend, can be easily peeled off after use, and does not easily contaminate the adherend. The adhesive is not particularly limited as long as it is, but considering the durability after bonding to an optical film, it is possible to use an acrylic adhesive formed by crosslinking a pressure-sensitive adhesive composition containing an acrylic polymer. It is common.

In particular, the acrylic polymer is a (meth) acrylic acid ester monomer in which the carbon number of the (A) alkyl group is C1 to C18, and the carbon number of the (a1) alkyl group is a (meth) acrylic acid ester monomer of the C1 to C4 A copolymerizable copolymer containing (B) a hydroxyl group as a copolymerizable monomer group and at least one type and at least one type of a (meth) acrylic acid ester monomer having at least one carbon number of C5 to C18 as the (a2) alkyl group A pressure-sensitive adhesive layer comprising an acrylic polymer of a copolymer obtained by copolymerizing at least one monomer is preferable.
Furthermore, as the above-mentioned copolymerizable monomer group, a polyalkylene glycol having an average repeating number of alkylene oxide constituting (F) polyalkylene glycol chain of 3 to 14 and a diester content in the monomer of 0.2% or less Mono (meth) acrylic acid ester monomers can be included.
It is preferable that the acrylic polymer does not contain a carboxyl group-containing copolymerizable monomer and a hydroxyl group-free nitrogen-containing vinyl monomer.
Furthermore, an adhesion comprising an adhesive composition comprising (C) a bifunctional or higher functional isocyanate compound, (D) a crosslinking accelerator, and (E) a ketoenol tautomeric compound in addition to the acrylic polymer. Agent layer is preferred.

Among the (meth) acrylic acid ester monomers having a C1 to C18 carbon number of the (A) alkyl group, as at least one (meth) acrylic acid ester monomer having a C1 to C4 carbon number of the (a1) alkyl group, Examples include butyl (meth) acrylate, isobutyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate and isopropyl (meth) acrylate.
As the (meth) acrylic acid ester monomer having a C5 to C18 carbon number of (a2) alkyl group, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, isooctyl (Meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (Meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate , Myristyl (meth) acrylate, isomyristyl (meth) acrylate, cetyl (meth) acrylate, isocetyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, and the like.
The carbon number of the (A) alkyl group is a total of 100 parts by weight of the (meth) acrylic acid ester monomer of C1 to C18, the carbon number of the (a1) alkyl group is the (meth) acrylic acid ester monomer of C1 to C4 Containing 1 to 30 parts by weight of at least one, and 70 to 99 parts by weight of at least one (meth) acrylic acid ester monomer having (C2 to C18) alkyl group (C2) It is preferable to contain 5 to 25 parts by weight of at least one of (a1) and 75 to 95 parts by weight of at least one of (a2), and It is particularly preferable to contain 8 to 22 parts by weight of at least one of a1) and 78 to 92 parts by weight of at least one of the above (a2).

(B) As a copolymerizable monomer containing a hydroxyl group, 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate And hydroxy-containing (meth) acrylamides such as N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-hydroxyethyl (meth) acrylamide and the like.
8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) It is preferable that it is at least 1 sort (s) or more selected from the compound group which consists of acrylamide and N- hydroxyethyl (meth) acrylamide. These (B) hydroxyl group-containing copolymerizable monomers do not have a polyalkylene glycol chain, unlike (F) polyalkylene glycol mono (meth) acrylic acid ester monomers described later.
(A) At least one kind of copolymerizable monomer containing a hydroxyl group (B) with respect to a total of 100 parts by weight of a (meth) acrylic acid ester monomer having a carbon number of C1 to C18 is 0.1 to 0.1 It is preferable to copolymerize in the ratio of 12 parts by weight, more preferably 0.1 to 9.5 parts by weight, and particularly preferably 0.3 to 8 parts by weight.
Further, when the total amount of the acrylic polymer is 100 parts by weight, it is preferable that the copolymerizable monomer containing a hydroxyl group (B) is contained in a ratio of 0.1 to 10 parts by weight, and 0. The amount is more preferably 1 to 8.5 parts by weight, and particularly preferably 0.3 to 7.5 parts by weight.

(C) The bifunctional or higher functional isocyanate compound may be at least one or more selected from polyisocyanate compounds having at least two or more isocyanate (NCO) groups in one molecule. The polyisocyanate compounds may be classified into aliphatic isocyanates, aromatic isocyanates, acyclic isocyanates, alicyclic isocyanates and the like, but any of them may be used. Specific examples of the polyisocyanate compound include aliphatic isocyanate compounds such as hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), trimethylhexamethylene diisocyanate (TMDI), diphenylmethane diisocyanate (MDI), xylylene diisocyanate (XDI) And aromatic isocyanate compounds such as hydrogenated xylylene diisocyanate (H6XDI), dimethyldiphenylene diisocyanate (TOID) and tolylene diisocyanate (TDI).
The trifunctional or higher isocyanate compound is a biuret-modified or isocyanurate-modified product of a bifunctional isocyanate compound (a compound having two NCO groups in one molecule), and a trivalent or higher such as trimethylolpropane (TMP) or glycerin. And adducts thereof (polyol-modified products) with the above-mentioned polyols (compounds having at least 3 or more OH groups in one molecule).
As the (C) bifunctional or higher functional isocyanate compound, it is also possible to use only the (C-1) trifunctional isocyanate compound or only the (C-2) bifunctional isocyanate compound. Moreover, it is also possible to use together the (C-1) trifunctional isocyanate compound and the (C-2) bifunctional isocyanate compound.

  Furthermore, as the (C-1) trifunctional isocyanate compound used in the present invention, isocyanurate of hexamethylene diisocyanate compound, isocyanurate of isophorone diisocyanate compound, adduct of hexamethylene diisocyanate compound, adduct of isophorone diisocyanate compound, (C-1-1) At least one or more selected from the group of aliphatic isocyanate compounds of the first group consisting of a biuret of hexamethylene diisocyanate compound and a biuret of isophorone diisocyanate compound, and tolylene diisocyanate Isocyanurate of compound, isocyanurate of xylylene diisocyanate compound, isocyanurate of hydrogenated xylylene diisocyanate compound, tolylene diisocyanate (C-1-2) A second aromatic isocyanate compound group comprising an adduct of a compound, an adduct of a xylylene diisocyanate compound, and an adduct of a hydrogenated xylylene diisocyanate compound; It is preferable to include at least one or more. It is preferable to use the (C-1-1) first aliphatic isocyanate compound group in combination with the (C-1-2) second aromatic isocyanate compound group. In the present invention, as the (C-1) trifunctional isocyanate compound, at least one or more selected from the group of (C-1-1) first aliphatic isocyanate compounds; 2) By combining at least one or more selected from the second aromatic isocyanate compounds, it is possible to further improve the balance of adhesion of the low-speed peeling area and the high-speed peeling area .

  In addition, the (C-1) trifunctional isocyanate compound is selected from at least one or more selected from the above (C-1-1) first aliphatic isocyanate compound group, and the above (C-1) 2) containing at least one or more selected from the second aromatic isocyanate compounds, and in total 0.5 to 5.0 parts by weight with respect to 100 parts by weight of the acrylic polymer Preferably, it is included. In addition, at least one selected from (C-1-1) first aliphatic isocyanate compounds, and (C-1-2) second aromatic isocyanate compounds selected from the group consisting of (C-1-1) :( C-1-2) in the range of 10%: 90% to 90%: 10% by weight ratio selected from Is preferred.

Furthermore, as the (C-2) bifunctional isocyanate compound used in the present invention, a non-cyclic aliphatic isocyanate compound is preferably a compound produced by reacting a diisocyanate compound and a diol compound.
For example, a diisocyanate compound having the general formula "O = CCN-X-N = C = O" (where X is a divalent group), and a general formula "HO-Y-OH" (where Y is a divalent group) As a compound produced | generated by making a diisocyanate compound and a diol compound react when it represents a diol compound, the compound represented by the following general formula Z is mentioned, for example.

[General formula Z]
O = C = N-X- (NH-CO-O-Y-O-CO-NH-X) _n- N = C = O

  Here, n is an integer of 0 or more. When n is 0, the general formula Z represents "O = C = N-X-N = C = O". Although a bifunctional acyclic aliphatic isocyanate compound may contain a compound of general formula Z where n is 0 (diisocyanate compound unreacted with respect to the diol compound), a compound in which n is an integer of 1 or more is an essential component. Is preferably contained. The difunctional acyclic aliphatic isocyanate compound may be a mixture of a plurality of compounds in which n in the general formula Z is different.

  The diisocyanate compound represented by the general formula "O = C = N-X-N = C = O" is an aliphatic diisocyanate. It is preferable that X is acyclic and aliphatic divalent group. The aliphatic diisocyanate preferably comprises one or more selected from the group consisting of tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, and lysine diisocyanate.

  The diol compound represented by the general formula "HO-Y-OH" is an aliphatic diol. Y is preferably an acyclic and aliphatic divalent group. Examples of the diol compound include 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, and 2-ethyl-2 -Compounds selected from the group consisting of -butyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,2-dimethyl-1,3-propanediol monohydroxypivalate, polyethylene glycol and polypropylene glycol It is preferable to consist of one or two or more selected.

  The weight ratio (C-1 / C-2) of the (C-1) trifunctional isocyanate compound to the (C-2) bifunctional isocyanate compound is preferably 1 to 90. It is preferable that the said (C) bifunctional or more than trifunctional isocyanate compound is 0.1-10 weight part with respect to 100 weight part of said acryl-type polymers.

  (D) The crosslinking accelerator may be a substance that functions as a catalyst for the reaction (crosslinking reaction) between the acrylic polymer and the crosslinking agent when using a polyisocyanate compound as the crosslinking agent, and a tertiary amine And organic metal compounds such as metal chelate compounds, organic tin compounds, organic lead compounds, organic zinc compounds and the like. In the present invention, metal chelate compounds and organic tin compounds are preferable as the crosslinking accelerator.

The metal chelate compound is a compound in which one or more polydentate ligands L are bonded to a central metal atom M. The metal chelate compound may or may not have one or more monodentate ligands X bonded to the metal atom M. For example, when a metal chelate compound having one metal atom M is represented by M (L) _m (X) _n , m ≧ 1 and n ≧ 0. When m is 2 or more, m L may be the same ligand or different ligands. When n is 2 or more, n X may be the same ligand or different ligands.

Examples of the metal atom M include Fe, Ni, Mn, Cr, V, Ti, Ru, Zn, Al, Zr, Sn and the like.
As polydentate ligand L, β-keto esters such as methyl acetoacetate, ethyl acetoacetate, octyl acetoacetate, oleyl acetoacetate, lauryl acetoacetate, stearyl acetoacetate, and acetylacetone (also known as 2,4-pentanedione), Examples include β-diketones such as 2,4-hexanedione and benzoylacetone. These are keto-enol tautomeric compounds and in the case of polydentate ligands L may be enolates (eg acetylacetonate) in which the enol is deprotonated.
Examples of the monodentate ligand X include halogen atoms such as chlorine atom and bromine atom, pentanoyl group, hexanoyl group, 2-ethylhexanoyl group, octanoyl group, nonanoyl group, decanoyl group, dodecanoyl group, octadecanoyl group, etc. And alkoxy groups such as methoxy group, ethoxy group, n-propoxy group, isopropoxy group and butoxy group.

  Specific examples of metal chelate compounds include tris (2,4-pentanedionato) iron (III), iron trisacetylacetonate, titanium trisacetylacetonate, ruthenium trisacetylacetonate, zinc bis acetylacetonate, aluminum tris Acetylacetonate, zirconium tetrakis acetylacetonate, tris (2,4-hexanedionato) iron (III), bis (2,4-hexanedionato) zinc, tris (2,4-hexanedionato) titanium, tris Examples include (2,4-hexanedionato) aluminum, tetrakis (2,4-hexanedionato) zirconium and the like.

Examples of the organic tin compound include dialkyl tin oxide, fatty acid salts of dialkyl tin, and fatty acid salts of stannous tin. Conventionally, dibutyltin compounds have been widely used, but in recent years, the problem of toxicity of organotin compounds has been pointed out, and in particular, tributyltin (TBT) contained in dibutyltin compounds is also concerned as an endocrine disrupting substance. From the viewpoint of safety, long-chain alkyl tin compounds such as dioctyl tin compounds are preferred. Specific examples of organotin compounds include dioctyltin oxide and dioctyltin dilaurate. Although Sn compounds can also be used tentatively, in view of the trend where the use of more safe substances is required in the future, Al, Ti, Fe, etc. are safer than Sn. It is preferred to use metal chelate compounds.
The (D) crosslinking accelerator in the pressure-sensitive adhesive composition according to the present invention is preferably at least one selected from the group consisting of an aluminum chelate compound, a titanium chelate compound, and an iron chelate compound.
The crosslinking accelerator (D) is preferably contained in an amount of 0.001 to 0.5 parts by weight with respect to 100 parts by weight of the acrylic polymer.

(E) Keto-enol tautomer compounds include β-keto esters such as methyl acetoacetate, ethyl acetoacetate, octyl acetoacetate, oleyl acetoacetate, lauryl acetoacetate, stearyl acetoacetate, acetylacetone, 2,4-hexanedione And β-diketones such as benzoylacetone. In the pressure-sensitive adhesive composition having a polyisocyanate compound as a crosslinking agent, these block the isocyanate group possessed by the crosslinking agent to suppress an excessive increase in viscosity and gelation of the pressure-sensitive adhesive composition after blending of the crosslinking agent. The pot life of the pressure-sensitive adhesive composition can be extended.
The keto-enol tautomer compound (E) is preferably contained in an amount of 0.1 to 300 parts by weight with respect to 100 parts by weight of the acrylic polymer.

  (E) The ratio of (E) keto enol tautomer compound to (D) crosslinking accelerator because (E) the keto enol tautomer compound has the effect of suppressing the crosslinking as opposed to (D) the crosslinking accelerator. Is preferably set appropriately. In order to prolong the pot life of the pressure-sensitive adhesive composition and improve the storage stability, the weight ratio of (E) / (D) is preferably 70 to 1000, and more preferably 70 to 700. And 80 to 600 are particularly preferred.

The acrylic polymer can optionally further contain (F) a polyalkylene glycol mono (meth) acrylic acid ester monomer as the copolymerizable monomer group. (F) The polyalkylene glycol mono (meth) acrylic acid ester monomer may be a compound in which one of the plural hydroxyl groups possessed by the polyalkylene glycol is esterified as a (meth) acrylic acid ester. Since the (meth) acrylic acid ester group becomes a polymerizable group, it can be copolymerized with the acrylic polymer. The other hydroxyl group may be OH as it is, and may be an alkyl ether such as methyl ether or ethyl ether, or a saturated carboxylic acid ester such as acetic acid ester.
As an alkylene group which polyalkylene glycol has, although an ethylene group, a propylene group, a butylene group etc. are mentioned, it is not limited to these. The polyalkylene glycol may be a copolymer of two or more polyalkylene glycols such as polyethylene glycol, polypropylene glycol and polybutylene glycol. Examples of the polyalkylene glycol copolymer include polyethylene glycol-polypropylene glycol, polyethylene glycol-polybutylene glycol, polypropylene glycol-polybutylene glycol, polyethylene glycol-polypropylene glycol-polybutylene glycol and the like, and the copolymer is It may be a block copolymer or a random copolymer.
(F) The polyalkylene glycol mono (meth) acrylic acid ester monomer preferably has an average repeating number of 3 to 14 of alkylene oxide constituting the polyalkylene glycol chain. The “average number of repetitions of alkylene oxide” is the average number of repeating alkylene oxide units in the “polyalkylene glycol chain” portion included in the molecular structure of (F) polyalkylene glycol mono (meth) acrylic acid ester monomer is there.
In the (F) polyalkylene glycol mono (meth) acrylic acid ester monomer, the diester content in the monomer is preferably 0.2% or less. The "diester component in the monomer" is the content (% by weight) of the polyalkylene glycol di (meth) acrylate contained in the (F) polyalkylene glycol mono (meth) acrylate monomer.

(F) The polyalkylene glycol mono (meth) acrylate monomer is selected from polyalkylene glycol mono (meth) acrylates, methoxypolyalkylene glycol (meth) acrylates, and ethoxy polyalkylene glycol (meth) acrylates. It is preferable that it is at least one or more.
More specifically, polyethylene glycol-mono (meth) acrylate, polypropylene glycol-mono (meth) acrylate, polybutylene glycol-mono (meth) acrylate, polyethylene glycol-polypropylene glycol-mono (meth) acrylate, polyethylene glycol-poly Butylene glycol-mono (meth) acrylate, polypropylene glycol-polybutylene glycol-mono (meth) acrylate, polyethylene glycol-polypropylene glycol-polybutylene glycol-mono (meth) acrylate; methoxypolyethylene glycol- (meth) acrylate, methoxypolypropylene glycol -(Meth) acrylate, methoxy polybutylene glycol-(meth) acrylate, methoxy Polyethylene glycol-polypropylene glycol- (meth) acrylate, methoxy-polyethylene glycol-polybutylene glycol- (meth) acrylate, methoxy-polypropylene glycol-polybutylene glycol- (meth) acrylate, methoxy-polyethylene glycol-polypropylene glycol-polybutylene glycol -(Meth) acrylate; ethoxy polyethylene glycol-(meth) acrylate, ethoxy polypropylene glycol (meth) acrylate, ethoxy polybutylene glycol (meth) acrylate, ethoxy-polyethylene glycol-polypropylene glycol-(meth) acrylate, ethoxy-polyethylene Glycol-polybutylene glycol- (meth) acrylate Ethoxy - polypropylene glycol - polybutylene glycol - (meth) acrylate, ethoxy - polyethylene glycol - polypropylene glycol - polybutylene glycol - such as (meth) acrylate.
(A) 0 to 50 weight of said (F) polyalkylene glycol mono (meth) acrylic acid ester monomer when the carbon number of the alkyl group makes the total of (meth) acrylic acid ester monomer of C1-C18 100 weight parts It is preferable to contain in the ratio of part. In the pressure-sensitive adhesive layer according to the present invention, the pressure-sensitive adhesive composition may not contain the (F) polyalkylene glycol mono (meth) acrylic acid ester monomer.

The pressure-sensitive adhesive composition can optionally contain a (H) polyether modified siloxane compound having an HLB value of 7 to 15. Polyether-modified siloxane compound is a siloxane compound having a polyether group, in addition to the normal siloxane units [-SiR ¹ ₂ -O-], siloxane units having polyether groups [-SiR ^{1 (R} 2 O ( R ³ O) _n R ⁴ ) -O-]. Here, R ¹ represents one or more alkyl groups or aryl groups, R ² and R ³ represent one or more alkylene groups, R ⁴ represents one or more alkyl groups or an acyl group Etc. (terminal group). Polyether group includes polyoxyalkylene groups such as polyoxyethylene group [(C ₂ H ₄ O) _n ] and polyoxypropylene group [(C ₃ H ₆ O) _n ].

The polyether-modified siloxane compound is preferably a polyether-modified siloxane compound having an HLB value of 7 to 15. In addition, the polyether modified siloxane compound having an HLB value of 7 to 15 is 1.0 part by weight or less (except in the case of 0 part by weight), 0.01 to 1.0, with respect to 100 parts by weight of the acrylic polymer. Preferably, it is included by weight. More preferably, it is 0.1 to 0.5 parts by weight.
HLB is, for example, a hydrophilic / lipophilic balance (hydrophilic / lipophilic ratio) defined in JIS K 3211 (term of surfactant) or the like.

The polyether-modified siloxane compound can be obtained, for example, by grafting an organic compound having an unsaturated bond and a polyoxyalkylene group to a polyorganosiloxane main chain having a silicon hydride group by a hydrosilylation reaction. Specifically, dimethylsiloxane methyl (polyoxyethylene) siloxane copolymer, dimethylsiloxane methyl (polyoxyethylene) siloxane methyl (polyoxypropylene) siloxane copolymer, dimethylsiloxane methyl (polyoxypropylene) A siloxane polymer etc. are mentioned. The HLB value of the polyether-modified siloxane compound can be adjusted by selecting the ratio of the polyether group to the siloxane group.
By blending the (H) polyether-modified siloxane compound having an HLB value of 7 to 15 into the pressure-sensitive adhesive composition, it is possible to improve the adhesive strength and the stain resistance of the pressure-sensitive adhesive. If the pressure-sensitive adhesive composition does not contain a polyether-modified siloxane compound, the cost is lower.

  Furthermore, as the other components, the pressure-sensitive adhesive composition according to the present invention includes, as other components, known surfactants, curing accelerators, plasticizers, fillers, curing retarders, processing aids, anti-aging agents, antioxidants, etc. Additives can be appropriately blended. These may be used alone or in combination of two or more.

The acrylic polymer used in the pressure-sensitive adhesive composition of the present invention is composed of (a1) alkyl group with respect to a total of 100 parts by weight of (meth) acrylic acid ester monomer having (C) alkyl group of C1 to C18. 1 to 30 parts by weight of at least one kind of (meth) acrylic acid ester monomer having a carbon number of C1 to C4, and (a2) at least one kind of (meth) acrylic acid ester monomer having a carbon number of C5 to C18 of an alkyl group Of 70 to 99 parts by weight and, as a group of copolymerizable monomers, (B) 0.1 to 12 parts by weight of at least one copolymerizable monomer having a hydroxyl group are synthesized. be able to. The copolymerizable monomer group may further include (F) a polyalkylene glycol mono (meth) acrylic acid ester monomer. The polymerization method of the acrylic polymer is not particularly limited, and appropriate polymerization methods such as solution polymerization and emulsion polymerization can be used.
The pressure-sensitive adhesive composition of the present invention contains an acrylic polymer, (C) a bifunctional or higher functional isocyanate compound, (D) a crosslinking accelerator, and (E) ketoenol tautomer compound, and further, optionally, any additive. It can be prepared by

  The cross-linking speed is improved and the adhesion is stabilized because the acrylic polymer does not contain a carboxyl group-containing copolymerizable monomer and a hydroxyl group-free nitrogen-containing vinyl monomer as a copolymerizable monomer group. Is effective. It is preferable to use a copolymerizable monomer containing a hydroxyl group (B) as a monomer that reacts with the (C) bifunctional or higher isocyanate compound used as a crosslinking agent. As a preferable monomer composition of the said acryl-type polymer, 1 type or more each from said (A) and said (B), 1 type or more each from said (A), said (B), and said (F), etc. It can be mentioned.

  The pressure-sensitive adhesive layer formed by crosslinking the pressure-sensitive adhesive composition has a tackiness of 0.05 to 0.1 N / 25 mm at a low peeling rate of 0.3 m / min and a high peeling rate of 30 m / min. The adhesive strength is preferably 1.0 N / 25 mm or less. This makes it possible to obtain a performance in which the adhesive strength is less changed even by the peeling speed, and it is possible to peel rapidly even by high-speed peeling. In addition, even when the antistatic surface protective film is once peeled off for re-sticking, it does not require an excessive force and is easily peeled off from the adherend.

The surface resistivity of the pressure-sensitive adhesive layer formed by crosslinking the pressure-sensitive adhesive composition is preferably 5.0 × 10 ⁺¹² Ω / □ or less, and the peeling voltage is preferably “± 0.6 kV or less”. In the present invention, “± 0.6 kV or less” means 0 to −0.6 kV and 0 to +0.6 kV, that is, −0.6 to +0.6 kV. When the surface resistivity is large, when the antistatic surface protective film is peeled from the adherend, the performance to release static electricity generated by charging is inferior. For this reason, by making the surface resistivity sufficiently low, the peeling-off voltage generated with the static electricity generated when the adherend peels off the pressure-sensitive adhesive layer is reduced, which affects the electric control circuit of the adherend, etc. Can be suppressed.

  The gel fraction of the pressure-sensitive adhesive layer (pressure-sensitive adhesive after crosslinking) formed by crosslinking the pressure-sensitive adhesive composition of the present invention is preferably 95 to 100%. Thus, by virtue of the high gel fraction, the adhesion does not become excessive at a low peeling rate, and the elution of unpolymerized monomers or oligomers from the acrylic polymer is reduced, resulting in contamination and high temperature / high humidity. The durability of the present invention can be improved, and the contamination of the adherend can be suppressed.

  The antistatic surface protective film of the present invention is obtained by forming a pressure-sensitive adhesive layer formed by crosslinking a pressure-sensitive adhesive composition on one side or both sides of a resin film. The antistatic surface protective film of the present invention is excellent in antistatic property because the pressure-sensitive adhesive layer is formed by crosslinking the pressure-sensitive adhesive composition in which the components (A) to (E) described above are blended in a well-balanced manner. It has good performance, good balance of adhesion at low peeling speed and high peeling speed, and excellent durability and contamination. For this reason, it can be conveniently used as a use of the surface protection film of a polarizing plate.

  The thickness of the pressure-sensitive adhesive layer 2 used in the antistatic surface protective film 10 according to the present invention is not particularly limited, but preferably about 5 to 40 μm, more preferably about 10 to 30 μm. From the adherend, it is the pressure-sensitive adhesive layer 2 having a slight adhesive strength, in which the peel strength (adhesive force) of the antistatic surface protective film to the surface of the adherend is about 0.03 to 0.3 N / 25 mm. It is preferable from the thing which is excellent in the operativity at the time of peeling off antistatic surface protection film. Moreover, since it is excellent in the operativity at the time of peeling off the peeling film 5 from the antistatic surface protective film 10, it is preferable that the peeling force from the adhesive layer 2 of the peeling film 5 is 0.2 N / 50 mm or less.

  In addition, the release film 5 used for the antistatic surface protective film 10 according to the present invention has a resin composition containing a release agent containing dimethylpolysiloxane as a main component and an antistatic agent on one side of the resin film 3. The release agent layer 4 used is formed. The release agent layer 4 preferably further contains a silicone compound which is liquid at 20 ° C. The silicone-based compound in the release agent layer 4 is preferably a polyether-modified silicone.

The resin film 3 may, for example, be a polyester film, a polyamide film, a polyethylene film, a polypropylene film or a polyimide film, but a polyester film is particularly preferable because of its excellent transparency and relatively low price. . The resin film may be a non-oriented film or a uniaxially or biaxially oriented film. In addition, the stretching ratio of the stretched film or the orientation angle in the axial direction formed along with the crystallization of the stretched film may be controlled to a specific value.
Although the thickness of the resin film 3 is not particularly limited, for example, a thickness of about 12 to 100 μm is preferable, and a thickness of about 20 to 50 μm is easy to handle and more preferable.
In addition, if necessary, the surface of the resin film 3 may be subjected to an easy adhesion treatment such as surface modification by corona discharge or application of an anchor coating agent.

  Examples of the release agent containing dimethylpolysiloxane as the main component of the release agent layer 4 include known silicone-based release agents such as addition reaction type, condensation reaction type, cationic polymerization type, and radical polymerization type. Products commercially available as addition reaction type silicone release agents include, for example, KS-776A, KS-847T, KS-779H, KS-837, KS-778, KS-830 (manufactured by Shin-Etsu Chemical Co., Ltd.) SRX-211, SRX-345, SRX-357, SD7333, SD7220, SD7223, LTC-300B, LTC-350G, LTC-310 (manufactured by Toray Dow Corning Co., Ltd.), and the like. As a product marketed as a condensation reaction type, SRX-290, SYLOFF-23 (Toray Dow Corning Co., Ltd. product) etc. are mentioned, for example. Products commercially available as cationic polymerization types include, for example, TPR-6501, TPR-6500, UV9300, VU9315, UV9430 (manufactured by Momentive Performance Materials), X62-7622 (manufactured by Shin-Etsu Chemical Co., Ltd.) And the like. As a product marketed as a radical polymerization type, X62-7205 (made by Shin-Etsu Chemical Co., Ltd.) etc. are mentioned, for example.

Examples of silicone-based compounds that are liquid at 20 ° C. that constitute the release agent layer 4 include polyether-modified silicones, alkyl-modified silicones and carbinol higher fatty acid ester-modified silicones. In the present invention, in order to improve the antistatic property of the surface of the pressure-sensitive adhesive layer, a silicone compound which is liquid at 20 ° C. in a compatible state is used in the release agent layer containing dimethylpolysiloxane as a main component. Be Among the modified silicone compounds, polyether modified silicones are preferred for use in the present invention. The polyether chain in the polyether modified silicone is composed of ethylene oxide, propylene oxide, etc. For example, by selecting the molecular weight of polyethylene oxide used for the side chain, physical properties such as compatibility with a silicone release agent, antistatic effect, etc. Is adjusted.
Further, products commercially available as polyether modified silicone include, for example, KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-642 (manufactured by Shin-Etsu Chemical Co., Ltd.), SH8400, SH8700, SF8410 (manufactured by Toray Dow Corning Co., Ltd.), TSF-4440, TSF-4441, TSF-4445, TSF-4446, TSF-4450 (manufactured by Momentive Performance Materials), BYK-300, BYK -306, BYK-307, BYK-320, BYK-325, BYK-330 (manufactured by Bick Chemie), and the like.
The addition amount of the silicone compound liquid at 20 ° C. with respect to the release agent containing dimethylpolysiloxane as a main component varies depending on the type of silicone compound and the degree of compatibility with the release agent, but the antistatic surface protection film is adhered It may be set in consideration of the desired peeling charge voltage, the contamination property to the adherend, the adhesive property and the like when peeling from the body.

  The antistatic agent constituting the releasing agent layer 4 has good dispersibility in a releasing agent solution containing dimethylpolysiloxane as a main component, and inhibits the curing of the releasing agent containing dimethylpolysiloxane as a main component It is preferable not to An alkali metal salt is suitable as such an antistatic agent.

Examples of the alkali metal salt include metal salts consisting of lithium, sodium and potassium. Specifically, for example, a cation consisting of Li ⁺ , Na ⁺ , K ⁺ , Cl ⁻ , Br ⁻ , I ⁻ , BF ₄ ⁻ , PF ₆ ⁻ , SCN ⁻ , ClO ₄ ⁻ , CF ₃ SO ₃ ⁻ , A metal salt composed of an anion consisting of (FSO ₂ ) ₂ N ⁻ , (CF ₃ SO ₂ ) ₂ N ⁻ , (C ₂ F ₅ SO ₂ ) ₂ N ⁻ , (CF ₃ SO ₂ ) ₃ C ⁻ Used for Among them, LiBr, LiI, LiBF ₄ , LiPF ₆ , LiSCN, LiClO ₄ , LiCF ₃ SO ₃ , Li (FSO ₂ ) ₂ N, Li (CF ₃ SO ₂ ) ₂ N, Li (C ₂ F ₅ SO _2). ) Lithium salts (Li salts) such as ₂ N, Li (CF ₃ SO ₂ ) ₃ C, in particular, Li (CF ₃ SO ₂ ) ₂ N "abbreviated LiTFSI", Li (FSO ₂ ) ₂ N "abbreviated LiFSI LiCF ₃ SO ₃ "abbreviated LiTF or LiTf" is preferably used. These alkali metal salts may be used alone or in combination of two or more. In order to stabilize the ionic substance, a compound containing a polyoxyalkylene structure may be added.
The amount of the antistatic agent added to the release agent containing dimethylpolysiloxane as a main component varies depending on the type of the antistatic agent and the degree of affinity with the release agent, but when the antistatic surface protective film is peeled from the adherend It may be set in consideration of the desired peeling charge voltage, the contamination property to the adherend, the adhesive property and the like.

There is no limitation in particular in the mixing method of the release agent which has dimethylpolysiloxane as a main component, and an antistatic agent. A method of adding an antistatic agent to a release agent containing dimethylpolysiloxane as a main component, mixing and then adding and mixing a catalyst for curing the release agent, an organic release agent containing dimethylpolysiloxane as a main component in advance A method of adding and mixing an antistatic agent and a catalyst for curing the release agent after dilution with a solvent, diluting the release agent containing a siloxane as a main component in an organic solvent in advance, adding and mixing the catalyst, and thereafter the antistatic agent Any method such as adding and mixing may be used. Moreover, you may add the material which assists the antistatic effect, such as a close_contact | adherence improvement agent, such as a silane coupling agent, and a compound containing a polyoxyalkylene group, as needed.
The mixing method of the polyether modified silicone with the release agent is the same as the mixing method with the antistatic agent, and is not particularly limited.

The mixing ratio of the release agent containing dimethylpolysiloxane as the main component to the antistatic agent is not particularly limited, but the solid content of the antistatic agent relative to 100 solids of the release agent containing dimethylpolysiloxane as the main component A ratio of about 5 to 100 is preferable as a minute. When the addition amount in terms of solid content of the antistatic agent is less than a ratio of 5 to the solid content 100 of the release agent containing dimethylpolysiloxane as the main component, the transfer amount of the antistatic agent onto the surface of the pressure sensitive adhesive layer is also As a result, the pressure-sensitive adhesive is less likely to exhibit the antistatic function. When the addition amount in terms of solid content of the antistatic agent exceeds a ratio of 100 to the solid content 100 of the release agent containing dimethylpolysiloxane as the main component, dimethylpolysiloxane as the main component together with the antistatic agent Since the release agent is also transferred to the surface of the pressure-sensitive adhesive layer, the pressure-sensitive adhesive properties of the pressure-sensitive adhesive may be reduced.
The mixing ratio of the polyether-modified silicone to the release agent is preferably about the same as the mixing ratio of the antistatic agent, and is not particularly limited.

  The method for forming the pressure-sensitive adhesive layer 2 and the method for bonding the release film 5 to the base film 1 of the antistatic surface protective film 10 according to the present invention may be performed by a known method, and is not particularly limited. Specifically, (1) a method of bonding the peeling film 5 after applying the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer 2 on one side of the base film 1 and drying to form the pressure-sensitive adhesive layer (2) The method of bonding the base film 1 etc. is mentioned, after applying and drying the adhesive composition for forming the adhesive layer 2 on the surface of the peeling film 5, and forming an adhesive layer. However, any method may be used.

  The pressure-sensitive adhesive layer 2 may be formed on the surface of the base film 1 by a known method. Specifically, known coating methods such as reverse coating, comma coating, gravure coating, slot die coating, Mayer bar coating, air knife coating and the like can be used.

  Similarly, the release agent layer 4 may be formed on the resin film 3 by a known method. Specifically, known coating methods such as gravure coating, mayer bar coating, air knife coating and the like can be used.

FIG. 2 is a cross-sectional view showing a state in which the release film is peeled off from the antistatic surface protective film of the present invention.
By peeling off the release film 5 from the antistatic surface protection film 10 shown in FIG. 1, part of the antistatic agent (symbol 7) contained in the release agent layer 4 of the release film 5 is the antistatic surface protection film The surface is transferred (adhered) to the surface of the pressure-sensitive adhesive layer 2. Therefore, in FIG. 2, the antistatic agent transferred onto the surface of the pressure-sensitive adhesive layer 2 of the antistatic surface protective film is schematically shown by spots of reference numeral 7.
In the antistatic surface protective film according to the present invention, the antistatic surface protective film 11 in a state in which the release film shown in FIG. 2 is peeled off is transferred to the surface of the pressure-sensitive adhesive layer 2 when pasting the adherend. Also, the antistatic agent contacts the surface of the adherend. As a result, when the antistatic surface protective film is peeled again from the adherend, it is possible to suppress the peeling charging voltage low.

FIG. 3 is a cross-sectional view showing an embodiment of the optical component of the present invention.
The release film 5 is peeled off from the antistatic surface protection film 10 of the present invention, and in a state where the pressure-sensitive adhesive layer 2 is exposed, it is bonded to the optical component 8 as an adherend via the pressure-sensitive adhesive layer 2 Ru.
That is, FIG. 3 shows an optical component 20 to which the antistatic surface protective film 10 of the present invention is bonded. Examples of optical components include optical films such as a polarizing plate, a retardation plate, a lens film, a polarizing plate also serving as a retardation plate, and a polarizing plate used as a lens film. Such optical components are used as components of various display devices such as liquid crystal display panels and organic EL display panels, and optical devices of various instruments. Moreover, as an optical component, films for optics, such as an antireflection film, a hard coat film, and a transparent conductive film for touch panels, are also mentioned. In particular, protection of optical films such as low reflection treated polarizing plates (LR polarizing plates) and antiglare low reflection treated polarizing plates (AG-LR polarizing plates) whose surfaces are treated with a silicone compound or fluorine compound to prevent contamination It can be suitably used as an antistatic surface protective film to be bonded to a surface that has been subjected to a stain treatment.
Examples of the low reflective surface treatment layer of the LR polarizing plate include metal oxide thin films (e.g. vapor deposited films such as SiO ₂ and TiO ₂ ), and antireflection films such as fluorine resin. Even when the pressure-sensitive adhesive layer of the antistatic surface protective film is stuck in contact with the above-described antireflective film, the antistatic surface protective film of the present invention has a reduced peeling voltage and low contamination to an adherend. And both.
According to the optical component of the present invention, when the antistatic surface protective film 10 is peeled and removed from the optical component (film for optics) which is an adherend, the peeling voltage can be suppressed sufficiently low. There is no risk of destroying circuit components such as IC, TFT elements, gate line drive circuits, etc., and the production efficiency can be enhanced in the process of manufacturing liquid crystal display panels, organic EL display panels, etc., and the reliability of production processes can be maintained. .

  The invention will now be further described by way of examples.

<Production of Pressure-Sensitive Adhesive Composition>
Example 1
Nitrogen gas was introduced into a reactor equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen inlet tube to replace air in the reactor with nitrogen gas. Then, 60 parts of solvent (ethyl acetate) together with 10 parts by weight of methyl acrylate, 90 parts by weight of 2-ethylhexyl acrylate, 5.0 parts by weight of 8-hydroxyoctyl acrylate, and 10 parts by weight of polypropylene glycol monoacrylate (n = 12) in a reactor. Weight parts were added. Thereafter, 0.1 parts by weight of azobisisobutyronitrile as a polymerization initiator is dropped over 2 hours, and reacted at 65 ° C. for 6 hours to obtain an acrylic polymer solution of Example 1 having a weight average molecular weight of 500,000. The To this acrylic polymer solution, 8.5 parts by weight of acetylacetone is added and stirred, and then 2.0 parts by weight of Coronate HX (isocyanurate of hexamethylene diisocyanate compound) and 0.1 parts by weight of titanium trisacetylacetonate The mixture was stirred and mixed to obtain the pressure-sensitive adhesive composition of Example 1.

[Examples 2 to 6 and Comparative Examples 1 to 3]
Pressure-sensitive adhesive compositions of Examples 2 to 6 and Comparative Examples 1 to 3 in the same manner as Example 1, except that the composition of the pressure-sensitive adhesive composition of Example 1 was changed as described in Table 1 and Table 2, respectively. I got a thing. In Tables 1 and 2, the monomers (copolymerized) contained in the acrylic polymer are (A), (B), (F), and a "carboxyl group-containing monomer".

Table 1 and Table 2 divide the integral table which shows the compounding ratio of each component into two, and all enclose the numerical value of the weight part calculated | required as the sum total of (A) group as 100 weight part in a parenthesis Indicated. In addition, the compound names of the abbreviations of the respective components used in Tables 1 and 2 are shown in Tables 3 and 4. In addition, Coronate (registered trademark) HX, HL and L are trade names of Tosoh Corporation, and Takenate (registered trademark) D-140N, D-127N and D-110N are trade names of Mitsui Chemical Co., Ltd. . In “antistatic agent” in Table 2 and Table 7 described later, LiTFSI represents Li (CF ₃ SO ₂ ) ₂ N, LiFSI represents Li (FSO ₂ ) ₂ N, and LiTF represents LiCF ₃ SO ₃ . Moreover, in the compound used for the (F) polyalkylene glycol mono (meth) acrylic acid ester monomer of each Example, the diester content in a monomer is 0.2% or less.

<Synthesis of Bifunctional Isocyanate Compound>
The bifunctional isocyanate compound of Synthesis Examples 1 and 2 was synthesized by the following method. As shown in Tables 5 and 6, a diisocyanate and a diol compound are mixed in a molar ratio: NCO / OH = 16 ratio, reacted at 120 ° C. for 3 hours, and then under reduced pressure using a thin film evaporator. Unreacted diisocyanate was removed to obtain the desired bifunctional isocyanate compound.

<Preparation of antistatic surface protection film>
Example 1
Addition reaction type silicone (Toray Dow Corning, product name: SRX-345) 5 parts by weight, polyether-modified silicone (Toray Dow Corning product, product name: SH8400, main component: dimethyl, methyl (polyethylene oxide) Acetate) siloxane) 0.15 parts by weight, 0.5 parts by weight of Li (CF ₃ SO ₂ ) ₂ N, 95 parts by weight of a 1: 1 mixed solvent of toluene and ethyl acetate, and platinum catalyst (Toray Dow Corning Co., Ltd.) Product name: SRX-212 catalyst) 0.05 parts by weight were mixed, stirred and mixed to prepare a paint for forming the release agent layer of Example 1. The paint for forming the release agent layer of Example 1 is coated on the surface of a polyethylene terephthalate film having a thickness of 38 μm with a Mayer to a dry thickness of 0.2 μm, and a hot air circulating oven at 120 ° C. The resultant was dried for 1 minute to obtain a release film of Example 1.
The pressure-sensitive adhesive composition of Example 1 is applied to the surface of a 38 μm thick polyethylene terephthalate film to a dry thickness of 20 μm, and then dried for 2 minutes in a hot air circulating oven at 100 ° C. The pressure-sensitive adhesive layer was formed. Then, the release agent layer (silicone-treated surface) of the release film of Example 1 produced above was bonded to the surface of the pressure-sensitive adhesive layer. The obtained pressure-sensitive adhesive film was kept at a temperature of 40 ° C. for 5 days to cure the pressure-sensitive adhesive, whereby an antistatic surface protective film of Example 1 was obtained.

Example 2
Example 2 in the same manner as Example 1, except that the pressure-sensitive adhesive composition of Example 1 was changed to the pressure-sensitive adhesive composition of Example 2, and the antistatic agent used for the release agent layer was changed to LiCF ₃ SO _3. The antistatic surface protection film was obtained.

[Examples 3 to 6]
The same as in Example 1 except that the pressure-sensitive adhesive composition of Example 1 was changed to the pressure-sensitive adhesive composition of Examples 3 to 6, and the antistatic agent used for the release agent layer was changed to Li (FSO ₂ ) ₂ N. To obtain the antistatic surface protective films of Examples 3 to 6.

Comparative Example 1
5 parts by weight of an addition reaction type silicone (made by Toray Dow Corning, product name: SRX-345), 95 parts by weight of a 1: 1 mixed solvent of toluene and ethyl acetate, and a platinum catalyst (made by Toray Dow Corning) Product name: SRX-212 catalyst) 0.05 parts by weight were mixed, stirred and mixed to prepare a paint for forming the release agent layer of Comparative Example 1. The paint for forming the release agent layer of Comparative Example 1 is coated on the surface of a polyethylene terephthalate film having a thickness of 38 μm with a Mayer to a dry thickness of 0.2 μm, and a hot air circulating oven at 120 ° C. The resultant was dried for 1 minute to obtain a release film of Comparative Example 1.
The pressure-sensitive adhesive composition of Comparative Example 1 is applied to the surface of a 38 μm thick polyethylene terephthalate film so that the thickness after drying is 20 μm, and then dried in a hot air circulating oven at 100 ° C. for 2 minutes. The pressure-sensitive adhesive layer was formed. Thereafter, the release agent layer (silicone-treated surface) of the release film of Comparative Example 1 prepared above was bonded to the surface of the pressure-sensitive adhesive layer. The obtained pressure-sensitive adhesive film was kept at 40 ° C. for 5 days to cure the pressure-sensitive adhesive, whereby an antistatic surface protective film of Comparative Example 1 was obtained.

Comparative Example 2
An antistatic surface protective film of Comparative Example 2 was obtained in the same manner as in Comparative Example 1 except that the pressure-sensitive adhesive composition of Comparative Example 1 was changed to the pressure-sensitive adhesive composition of Comparative Example 2.

Comparative Example 3
The pressure-sensitive adhesive composition of Example 1 is changed to the pressure-sensitive adhesive composition of Comparative Example 3, and the antistatic agent used for the release agent layer is changed to Li (FSO ₂ ) ₂ N in the same manner as in Example 1. An antistatic surface protective film of Comparative Example 3 was obtained.

  In Table 7, the composition of the release agent layer in the antistatic surface protective film of Examples 1-6 and Comparative Examples 1-3 is shown.

<Test method and evaluation>
After aging the antistatic surface protective films in Examples 1 to 6 and Comparative Examples 1 to 3 in an atmosphere of 23 ° C. and 50% RH for 7 days, the release film (PET film coated with silicone resin) is peeled off. The thing which made the pressure sensitive adhesive layer exposed was made into the measurement sample of surface resistivity.
Further, the antistatic surface protective film in which the pressure-sensitive adhesive layer is exposed is attached to the surface of the polarizing plate attached to the liquid crystal cell through the pressure-sensitive adhesive layer, and left for 1 day. The samples were autoclaved for 20 minutes and left to stand at room temperature for a further 12 hours, which were used as measurement samples of adhesion, peel voltage and contamination.

<Adhesiveness>
Low-speed peeling speed (0.3 m / min) using a tensile tester in the direction of 180 ° with the measurement sample obtained above (the 25 mm wide antistatic surface protective film attached to the surface of the polarizing plate) And it peeled off in high-speed peeling speed (30 m / min), and made the measured peeling strength adhesive.

<Surface resistivity>
After aging, before bonding to a polarizing plate, the release film (PET film coated with silicone resin) is peeled off to expose an adhesive layer, and using a resistivity meter HIRESTA UP-HT450 (manufactured by Mitsubishi Chemical Analytech Co., Ltd.) The surface resistivity of the pressure-sensitive adhesive layer was measured.

<Peeling voltage>
The voltage (charging voltage) generated when the polarizing plate is charged when the measurement sample obtained above is peeled at 180 ° at a tensile speed of 30 m / min is defined as the high accuracy electrostatic sensor SK-035, SK-200 (stock It measured using the company Keyence make, and made the maximum value of the measured value the peeling zone voltage.

Contamination
Using a bonding machine, a polarizing plate which has been subjected to low reflection surface treatment on one side of a glass plate, using an adhesive layer (for example, a double-sided adhesive tape different from the adhesive layer of the antistatic surface protective film) Paste it. Then, an antistatic surface protection film is bonded on the surface of a polarizing plate using a bonding machine. After storage for 3 days and 30 days under an environment of 23 ° C. and 50% RH, the antistatic surface protective film is peeled off, and the contamination of the surface of the polarizing plate is visually observed.
The surface contamination property is the case where the surface of the polarizing plate is slightly contaminated in any of storage for 3 days and storage for 30 days without "○", storage for 3 days and storage for 30 days. Was evaluated as "Δ", and the case with contamination was evaluated as "X".

Table 8 shows the evaluation results. The surface resistivity is represented by a method in which “m × 10 ^{+ n} ” is “mE + n” (where, m is an arbitrary real number and n is a positive integer).

From the measurement results shown in Table 8, the following can be understood.
The antistatic surface protective films of Examples 1 to 6 according to the present invention have adequate adhesion, no contamination to the surface of the adherend, and when the antistatic surface protective film is peeled from the adherend Peeling voltage is low.
On the other hand, the antistatic surface protective film of Comparative Example 1 in which the antistatic agent was added to the pressure-sensitive adhesive layer was good in the surface resistivity of the pressure-sensitive adhesive layer but low in stainability.
In addition to the addition of the antistatic agent to the pressure-sensitive adhesive layer, the antistatic surface protective film of Comparative Example 2 includes (a1) (meth) acrylic acid ester monomer having an alkyl group having a carbon number of C1 to C4, and (B) The adhesive power is high, the peel voltage is high, and the contamination is slightly inferior, probably because the amount of the copolymerizable monomer containing a hydroxyl group is large.
In addition, in the antistatic surface protective film of Comparative Example 3, the acrylic polymer does not contain a (meth) acrylic acid ester monomer having a C1 to C4 carbon number of the (a1) alkyl group, and contains a monomer having a carboxyl group. Therefore, the adhesion was high and the contamination was inferior.
That is, in Comparative Examples 1 and 2 in which the antistatic agent is mixed in the pressure-sensitive adhesive layer, it is difficult to simultaneously achieve the reduction of the peeling charge voltage and the low staining property to the adherend. On the other hand, after adding the antistatic agent to the release agent layer, in Examples 1 to 6 in which the antistatic agent contained in the release agent layer is transferred to the surface of the pressure-sensitive adhesive layer, a small amount of antistaticity is prevented on the release agent layer. Since the addition of the agent has the effect of reducing the peeling charge voltage, there is no contamination of the adherend, and a good antistatic surface protective film is obtained.

The antistatic surface protective film of the present invention is, for example, a surface of the optical component etc. in the production process of optical films such as a polarizing plate, a retardation plate, a lens film for display, etc., other various optical components etc. Can be used to protect In particular, when used as an antistatic surface protective film for an optical film such as an LR polarizing plate or an AG-LR polarizing plate, the surface of which has been treated to prevent contamination with a silicone compound or a fluorine compound, peeling from the adherend At the same time, the amount of static electricity generated can be reduced.
The antistatic surface protective film of the present invention has an excellent anti-peeling antistatic performance with little contamination to the adherend and further without deterioration with time, thereby improving the yield of production processes for optical films, optical parts, etc. Can be used, industrial value is great.

DESCRIPTION OF SYMBOLS 1 ... Base film, 2 ... adhesive layer, 3 ... resin film, 4 ... release agent layer, 5 ... peeling film, 7 ... antistatic agent, 8 ... adherend (optical component), 10 ... antistatic surface protection Film, 11: antistatic surface protective film from which the peeling film is peeled, 20: optical component laminated with the antistatic surface protective film.

Claims (8)

An antistatic surface protective film comprising a pressure-sensitive adhesive layer in which a pressure-sensitive adhesive composition containing an acrylic polymer is crosslinked is formed on one side of a substrate film made of a resin having transparency.
The acrylic polymer is
(A) 100 parts by weight in total of at least one or more of (meth) acrylic acid ester monomers having a C1 to C18 carbon number of the alkyl group,
(B) An acrylic polymer of a copolymer obtained by copolymerizing 0.1 to 12 parts by weight of a total of at least one or more kinds of copolymerizable monomers containing a hydroxyl group,
Of the total 100 parts by weight of at least one or more of (meth) acrylic acid ester monomers wherein the carbon number of the (A) alkyl group is C1 to C18,
(A1) 1 to 30 parts by weight in total of at least one kind of (meth) acrylic acid ester monomer having C1 to C4 carbon atoms in the alkyl group,
(A2) The total of at least one or more of (meth) acrylic acid ester monomers having a carbon number of C5 to C18 in the alkyl group is contained in a ratio of 70 to 99 parts by weight,
The acrylic polymer does not include a carboxyl group-containing copolymerizable monomer and a hydroxyl group-free nitrogen-containing vinyl monomer.
The pressure-sensitive adhesive composition further comprises (C) a bifunctional or higher isocyanate compound, (D) a crosslinking accelerator, and (E) a ketoenol tautomer compound, and an antistatic agent. Does not contain
A release film in which a release agent layer containing an antistatic agent is laminated on one surface of a resin film on the surface of the pressure-sensitive adhesive layer is laminated via the release agent layer,
The release agent layer is formed of a resin composition containing a release agent containing dimethylpolysiloxane as a main component, a polyether-modified silicone which is a silicone-based compound liquid at 20 ° C., and an antistatic agent,
When the release film is peeled from the surface of the pressure-sensitive adhesive layer of the antistatic surface protective film, the antistatic agent of the release agent layer is transferred to the surface of the pressure-sensitive adhesive layer;
The antistatic surface protection film from which the release film has been peeled off is bonded to a polarizing plate subjected to a low reflection surface treatment via the pressure-sensitive adhesive layer, and then the contamination property when peeled off is good. Antistatic surface protection film. In the pressure-sensitive adhesive composition, (F) an alkylene oxide constituting a polyalkylene glycol chain with respect to a total of 100 parts by weight of a (meth) acrylic acid ester monomer having a C1 to C18 alkyl group (C) 0 to 50 parts by weight (except in the case of 0 parts by weight) of polyalkylene glycol mono (meth) acrylic acid ester monomer having an average repeating number of 3 to 14 and a diester content in the monomer of 0.2% or less (F) or does not contain the above (F),
In the pressure-sensitive adhesive composition, (H) polyether modified siloxane compound having an HLB value of 7 to 15 is 1.0 part by weight or less (except in the case of 0 part by weight) with respect to 100 parts by weight of the acrylic polymer The antistatic surface protective film according to claim 1, wherein the film comprises   The (D) crosslinking accelerator is at least one selected from the group consisting of an aluminum chelate compound, a titanium chelate compound, and an iron chelate compound, and 0.001 to 1 part per 100 parts by weight of the acrylic polymer. 0.5 parts by weight, containing 0.1 to 300 parts by weight of the (E) keto enol tautomer compound, and the ratio by weight of (E) / (D) is 70 to 1000 The antistatic surface protective film according to claim 1 or 2, characterized in that   The (B) hydroxyl group-containing copolymerizable monomer is 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate And at least one selected from a group of compounds consisting of N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide and N-hydroxyethyl (meth) acrylamide, and 100 weight of said acrylic polymer The antistatic surface protective film according to any one of claims 1 to 3, wherein the amount is 0.1 to 10 parts by weight with respect to the part.   The antistatic surface protection film according to any one of claims 1 to 4, wherein the antistatic agent in the release agent layer is an alkali metal salt.   The antistatic agent in the release agent layer is a Li salt, and is at least one selected from the group of compounds consisting of LiTFSI, LiFSI and LiTF. Antistatic surface protection film as described in.   The film for optics by which the antistatic surface protection film in any one of Claims 1-6 is bonded together.   The optical component in which the antistatic surface protection film in any one of Claims 1-6 is bonded together.

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