TWI612120B - Antistatic surface protection film - Google Patents

Abstract

The invention provides an antistatic surface protection film with less pollution to adherends, no deterioration with time, and excellent anti-peeling electrostatic performance. The antistatic surface protection film is sequentially passed through a single substrate film (1) made of a transparent resin. An adhesive composition comprising a copolymer-containing acrylic polymer, and further containing (D) a difunctional or higher isocyanate compound, (E) a crosslinking accelerator, and (F) a keto-enol tautomer compound. A step of forming an adhesive layer (2); a release film (5) obtained by laminating an antistatic agent-containing release agent layer (4) on one side of a resin film (3), and applying the release agent layer (4) It is produced by a process of bonding to the surface of the adhesive layer (2). The release agent layer (4) is formed of a resin composition containing a release agent containing dimethyl polysiloxane as a main component, a polysiloxane compound which is liquid at 20 ° C, and an antistatic agent. 2) The peeling static voltage is less than ± 0.6 kV.

Description

Antistatic surface protective film

The invention relates to an adhesive composition and a surface protective film. In detail, it is related with the antistatic surface protective film which has antistatic performance. More specifically, the present invention provides a method for producing an antistatic surface protective film that has less contamination to an adherend, does not deteriorate over time, and also has excellent anti-peel electrostatic properties, and an antistatic surface protective film.

At present, when manufacturing and transporting optical films such as polarizing plates, retardation plates, display lens films, anti-reflection films, hard coating films, transparent conductive films for touch panels, and optical products using such displays, The surface protection film is bonded to the surface of the optical film to prevent surface contamination and scratches in subsequent processes. In order to save the labor and time of peeling the surface protective film and then attaching it, thereby improving work efficiency, the appearance inspection of the optical film as a product may sometimes have a surface protection attached to the optical film. The state of the film was carried out directly.

Conventionally, in order to prevent the adhesion of scratches and dirt during the manufacturing process of an optical product, a surface protective film having an adhesive layer is usually provided on one side of a base film. The surface protective film is adhered to the optical film with an adhesive layer having a slight adhesive force. The reason why the adhesive layer is set to have a slight adhesive force is that when the used surface protection film is removed from the surface of the optical film and removed, it can be easily peeled off, and to prevent the adhesive from adhering and remaining on the adherend. Phenomenon on the optical film (so-called to prevent the occurrence of adhesive residue).

In recent years, in the production process of a liquid crystal display panel, a peeling static voltage generated when a surface protective film attached to an optical film is peeled off and removed may damage a circuit such as a driver IC for controlling a display screen of the liquid crystal display panel. The components and the orientation of the liquid crystal molecules are damaged. Although these phenomena occur in a small number, they still exist.

In addition, in order to reduce the power consumption of the liquid crystal display panel, the driving voltage of the liquid crystal material tends to decrease, and the breakdown voltage of the driving IC also decreases accordingly. Recently, it is required to control the peeling static voltage within a range of +0.7 kV to -0.7 kV.

Therefore, in order to prevent defects caused by a high peeling static voltage when the surface protective film is peeled off from an optical film as an adherend, a surface protective film has been proposed which uses an antistatic agent to reduce the peeling static voltage. Adhesive layer of electrostatic agent.

For example, Patent Document 1 discloses a surface protective film using an adhesive composed of an alkyltrimethylammonium salt, a hydroxyl-containing acrylic polymer, and a polyisocyanate.

In addition, Patent Document 2 discloses an adhesive composition composed of an ionic liquid and an acrylic polymer having an acid value of 1.0 or less, and an adhesive sheet using the composition.

In addition, Patent Document 3 discloses an adhesive composition composed of an acrylic polymer, a polyether polyol compound, and an alkali metal salt treated with an anion-adsorbing compound, and a surface protective film using the composition. .

In addition, Patent Document 4 discloses an adhesive composition composed of an ionic liquid, an alkali metal salt, and a polymer having a glass transition temperature of 0 ° C or lower, and a surface protective film using the composition.

In addition, Patent Documents 5 and 6 disclose the technical content of mixing a polyether-modified polysiloxane with an adhesive layer of a surface protective film.

In the aforementioned Patent Documents 1 to 4, an antistatic agent is added inside the adhesive layer, but the thicker the thickness of the adhesive layer, the more the antistatic agent is bonded to the surface protective film from the adhesive layer over time. The more the adherent moves, the more it will move. In addition, in optical films such as low-reflection (LR, Low Reflective) polarizers, anti-glare (AG), and low-reflection (LR) polarizers, the use of polysiloxane compounds or fluoride The antifouling treatment is applied to the surface of the film. Therefore, when the surface protective film used for the optical film is peeled from the optical film as an adherend, the peeling static voltage becomes high.

In addition, as described in Patent Documents 5 and 6, when a polyether-modified polysiloxane is mixed in the adhesive layer, it is difficult to fine-tune the adhesive force of the surface protective film. In addition, since the polyether-modified silicone is mixed in the adhesive layer, when the conditions for applying and drying the adhesive composition on the substrate film are changed, the surface of the adhesive layer formed on the surface protective film is changed. The characteristics change subtly. In addition, from the viewpoint of protecting the surface of the optical film, the thickness of the adhesive layer cannot be set to be extremely thin. Therefore, according to the thickness of the adhesive layer, it is necessary to increase the amount of polyether-modified polysiloxane mixed in the adhesive layer. As a result, it is easy to contaminate the surface of the adherend, and the adhesion and the contamination of the adherend occur with time. Variety.

In recent years, with the spread of 3D displays (stereoscopic displays), a patterned retarder (FPR) film may be bonded to the surface of an optical film such as a polarizing plate. After peeling the surface protection film bonded to the surface of an optical film such as a polarizing plate, the FPR film is bonded. However, when the surface of an optical film such as a polarizing plate is contaminated with an adhesive or an antistatic agent used for a surface protection film, there is a problem that it is difficult to adhere the FPR film. Therefore, the surface protection film used for this application is required to have less contamination to an adherend.

On the other hand, in some liquid crystal panel manufacturers, as a method for evaluating the contamination property of a surface protection film to an adherend, the following method is used: the surface protection film bonded to an optical film such as a polarizing plate is peeled once After re-lamination in a state where air bubbles are mixed, the re-laminated article is heat-treated under prescribed conditions, and then the surface protective film is peeled off and the surface of the adherend is observed. In this evaluation method, even if the surface contamination of the adherend is slight, if there is a difference in the surface contamination of the adherend between the part in which the air bubbles are mixed and the part in contact with the adhesive of the surface protection film, it is regarded as air bubbles. Traces (sometimes called "bubble stains") remain. Therefore, as a method for evaluating the contamination of the surface of an adherend, it is a very strict evaluation method. In recent years, even as a result of determination by such a rigorous evaluation method, a surface protective film that has no problem with the surface contamination of an adherend is required. However, the current situation is that it has been difficult to solve this problem in a surface protection film using a pressure-sensitive adhesive layer containing an antistatic agent.

Therefore, there is a need for a surface protection film for use in an optical film, which has very little contamination of the adherend, and does not change the contamination of the adherend with time (it does not change over time). In addition, a surface protective film that suppresses the peeling static voltage when peeling from the adherend is low.

Prior art literature

Patent literature

Patent Document 1: Japanese Patent Application Laid-Open No. 2005-131957

Patent Document 2: Japanese Patent Application Laid-Open No. 2005-330464

Patent Document 3: Japanese Patent Application Laid-Open No. 2005-314476

Patent Document 4: Japanese Patent Application Laid-Open No. 2006-152235

Patent Document 5: Japanese Patent Application Laid-Open No. 2009-275128

Patent Document 6: Japanese Patent No. 4537450

Problems to be solved by the invention

In order to solve this problem, the inventors of the present case conducted careful research.

In order to reduce contamination of the adherend and also to reduce the change with time of the antistatic performance, it is necessary to reduce the amount of the antistatic agent presumed to be the cause of contaminating the adherend. However, when the amount of the antistatic agent is reduced, the peeling static voltage when the surface protective film is peeled from the adherend becomes high. The present inventors have studied a method for suppressing the peeling static voltage when peeling the surface protective film from the adherend to be low without increasing the absolute amount of the antistatic agent. As a result, it was found that instead of adding an antistatic agent to the adhesive composition and mixing to form an adhesive layer, the adhesive composition was coated and dried to laminate the adhesive layer, and then the surface of the adhesive layer was imparted with an appropriate amount of resistance. The electrostatic agent component can suppress the peeling static voltage when peeling the surface protective film from the optical film as an adherend to be low, and completed the present invention.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an antistatic surface protective film with excellent anti-peeling electrostatic properties with little pollution to adherends and no degradation with time (deterioration does not occur over time). .

Technical means to solve problems

In order to solve the above problems, the technical idea of the antistatic surface protective film of the present invention is that after applying the adhesive composition and drying to laminate the adhesive layer, the surface of the adhesive layer is given an appropriate amount which is liquid at 20 ° C. A polysiloxane (silicone) -based compound and an antistatic agent can suppress the contamination of the adherend to a low level, and can be peeled off from the optical film as an adherend. Static voltage suppression is low.

In order to solve the above-mentioned problems, the present invention provides an antistatic surface protection film which is manufactured through the following steps (1) to (2) in this order.

Step (1): A step of forming an adhesive layer made of an adhesive composition on one surface of a base film made of a resin having transparency.

The adhesive composition includes: (A) at least one of (C) to C18 alkyl (meth) acrylate monomers having an alkyl group, and carboxyl groups not included in the group as a copolymerizable monomer group Copolymerizable monomer consisting of (B) a hydroxyl-containing copolymerizable monomer and (C) a hydroxyl-free nitrogen-containing vinyl monomer or an alkoxy-containing (meth) acrylic acid alkyl ester monomer An acrylic polymer of a copolymer of at least one of the copolymerizable monomer groups; further comprising (D) a difunctional or higher isocyanate compound, (E) a crosslinking accelerator, and (F) a keto-enol tautomer Compound.

Step (2): A step of laminating a release film formed by laminating an antistatic agent-containing release agent layer on one side of a resin film, and bonding the release film to the surface of the adhesive layer with the release agent layer.

The release agent layer is formed by a resin composition containing a release agent containing dimethylpolysiloxane as a main component, a silicone-based compound that is liquid at 20 ° C, and the antistatic agent. The peeling static voltage of the adhesive layer is ± 0.6 kV or less.

The copolymerizable monomer group preferably further contains (G) a polyalkylene glycol mono (meth) acrylate monomer.

The (E) crosslinking accelerator is preferably at least one selected from the group consisting of an aluminum chelate, a titanium chelate, and an iron chelate.

In addition, it is preferable that the (B) hydroxyl-containing copolymerizable monomer is selected from the group consisting of 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. Esters, 2-hydroxyethyl (meth) acrylate, N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, and N-hydroxyethyl (meth) acrylamide At least one or more compounds in the composition group.

In addition, it is preferable that the (G) polyalkylene glycol mono (meth) acrylate monomer is selected from the group consisting of polyalkylene glycol mono (meth) acrylate and methoxy polyalkylene glycol (methyl Group) at least one of an acrylate) and an ethoxy polyalkylene glycol (meth) acrylate.

The difunctional or higher isocyanate compound (D) is preferably a compound produced by reacting a diisocyanate compound with a diol compound as the difunctional isocyanate compound, which is an acyclic aliphatic isocyanate compound. Among them, the diisocyanate compound is an aliphatic diisocyanate, which is selected from the group consisting of tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, and ionamine. One of the compound group consisting of acid diisocyanate; the diol compound is selected from the group consisting of 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2-methyl 2-propyl-1,3-propanediol, 2-ethyl-2-butyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,2-dimethyl-1 One of the compound groups consisting of 1,3-propanediol monohydroxypivalate, polyethylene glycol, and polypropylene glycol. The trifunctional isocyanate compound is preferably an isocyanurate or an isocyanurate of an hexamethylene diisocyanate compound. Isocyanurate of phorone diisocyanate compound, adduct of hexamethylene diisocyanate compound, adduct of isophorone diisocyanate compound, biuret of hexamethylene diisocyanate compound, iso Biuret of furfurone diisocyanate compound, isocyanurate of toluene diisocyanate compound, Isocyanurate of xylylene diisocyanate compound, isocyanurate of hydrogenated xylylene diisocyanate compound, addition product of toluene diisocyanate compound, addition product of xylylene diisocyanate compound, and Adduct of hydrogenated xylylene diisocyanate compound.

The adhesive composition preferably contains a (H) polyether-modified silicone compound having an HLB value of 7 to 15.

In addition, the polysiloxane compound in the release agent layer is preferably a polyether-modified polysiloxane.

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

In addition, in order to solve the above-mentioned problems, the present invention provides an antistatic surface protection film comprising an adhesive layer formed on one side of a substrate film made of a transparent resin, and laminated on the surface of the adhesive layer. A release agent film formed by laminating an antistatic agent-containing release agent layer on one side of a resin film is produced by bonding the adhesive layer and the release agent layer in contact with each other.

The adhesive layer is composed of at least one of (A) alkyl (meth) acrylate monomers having C4 to C18 carbon atoms, and is selected from the group consisting of copolymerizable monomers that does not include a carboxyl group. Copolymerizable monomer consisting of (B) a hydroxyl-containing copolymerizable monomer and (C) a hydroxyl-free nitrogen-containing vinyl monomer or an alkoxy-containing alkyl (meth) acrylate monomer An adhesive layer of an acrylic polymer composed of a copolymer of at least one copolymerizable monomer group.

The release agent layer is formed by a resin composition containing a release agent containing dimethylpolysiloxane as a main component, a polysiloxane compound that is liquid at 20 ° C, and an antistatic agent.

The copolymerizable monomer group preferably further contains (G) a polyalkylene glycol mono (meth) acrylate monomer.

In addition, the polysiloxane compound in the release agent layer is preferably a polyether-modified polysiloxane.

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

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

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

efficacy

The antistatic surface protection film of the present invention has less pollution to the adherend, and has no time-varying change to the adherend's low pollution (it will not change with time). In addition, according to the present invention, it is possible to provide an optical film capable of preventing contamination of a surface of an adherend such as an LR polarizing plate or an AG-LR polarizing plate with a polysiloxane compound, a fluoride, or the like. The peeling static voltage that occurs when the antistatic surface protective film is peeled off from the adherend is suppressed to be low, and it has an antistatic surface protective film that has no degradation with time and has excellent antistatic properties.

The antistatic surface protection film according to the present invention can reliably protect the surface of the optical film, and therefore can improve production efficiency and yield.

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

FIG. 1 is a schematic cross-sectional view of an antistatic surface protection film of the present invention. In this antistatic surface protection film 10, an adhesive layer 2 is formed on one surface of a transparent base film 1. A release film 5 is laminated on the surface of the adhesive layer 2, and the release film 5 is formed by forming a release agent layer 4 on the surface of the resin film 3.

As the base film 1 used in the antistatic surface protective film 10 of the present invention, a base film made of a resin having transparency and flexibility is used. Thereby, the external appearance inspection of an optical component can be performed in the state which bonded the antistatic surface protective film to the optical component as an adherend. As the film made of a transparent resin used as the base film 1, polyethylene terephthalate, polyethylene naphthalate, and polyethylene isophthalate are preferably used. ) And polyester films such as polybutylene terephthalate. As this base film, it is sufficient as long as it has the required strength and optical adaptability, and a film made of another resin may be used in addition to the polyester film. The base film 1 may be an unstretched film or a film subjected to uniaxial stretching or biaxial stretching. In addition, the stretching ratio of the stretched film and the orientation angle in the axial direction of the stretched film accompanying crystallization may be controlled to specific values.

The thickness of the base film 1 used in the antistatic surface protection film 10 of the present invention is not particularly limited. For example, a thickness of about 12 to 100 μm is preferred; a thickness of about 20 to 50 μm is easy Operation is therefore more preferred.

In addition, if necessary, an antifouling layer, an antistatic layer, a hard coat layer, or the like for preventing surface contamination may be provided on the surface of the base film 1 opposite to the surface on which the adhesive layer 2 is formed. In addition, the surface of the base film 1 may be subjected to adhesion treatment such as surface modification by corona discharge, application of a primer, and the like.

In addition, as for the adhesive layer 2 used in the antistatic surface protective film 10 of the present invention, as long as it is adhered to the surface of the adherend, it can be easily peeled off after use, and it is difficult to contaminate the adherend. The adhesive layer is not particularly limited, but an acrylic adhesive layer obtained by crosslinking a (meth) acrylate copolymer is generally used in consideration of durability after bonding to an optical film.

In particular, it is preferable that the main component of the acrylic adhesive is at least one of (A) alkyl (meth) acrylate monomers having C4 to C18 carbon atoms, and a component selected from the group consisting of copolymerizable monomers. Excluding carboxyl-containing copolymerizable monomers, (B) hydroxyl-containing copolymerizable monomers and (C) hydroxyl-free nitrogen-containing vinyl monomers or alkoxy-containing alkyl (meth) acrylates An adhesive layer composed of an acrylic polymer of a copolymer of at least one copolymerizable monomer group composed of a monomer.

The copolymerizable monomer group may further contain (G) a polyalkylene glycol mono (meth) acrylate monomer.

More preferably, in addition to the acrylic polymer, an adhesive composition containing (D) a difunctional or higher isocyanate compound, (E) a crosslinking accelerator, and (F) a keto-enol tautomer compound. Composition of an adhesive layer.

Examples of the (A) alkyl (meth) acrylate monomer having C4 to C18 carbon atoms include butyl (meth) acrylate, isobutyl (meth) acrylate, and (meth) acrylic acid Amyl ester, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (formyl) (Nonyl) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, twelve (meth) acrylate Alkyl ester, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, cetyl (meth) acrylate, (formyl) Base) heptadecyl acrylate, octadecyl (meth) acrylate, myristyl (meth) acrylate, isotetradecyl (meth) acrylate, cetyl (meth) acrylate, Isohexadecyl (meth) acrylate, stearyl (meth) acrylate, and (meth) propylene Isostearyl acrylate.

When the total amount of the acrylic polymer of the copolymer is set to 100 parts by weight, the content of the (A) alkyl (meth) acrylate monomer having C4 to C18 in the alkyl group is preferably 50 to 95 parts by weight.

Examples of the (B) hydroxyl-containing copolymerizable monomer include 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and ( (Meth) acrylic hydroxyalkyl esters such as 2-hydroxyethyl methacrylate; N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, and N-hydroxyethyl (Meth) acrylamide containing hydroxyl groups such as (meth) acrylamide and the like.

Preferably, the above-mentioned hydroxyl-containing copolymerizable monomer is selected from the group consisting of 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and (methyl) ) 2-hydroxyethyl acrylate, N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide and N-hydroxyethyl (meth) acrylamide At least one more.

When the total amount of the acrylic polymer of the copolymer is set to 100 parts by weight, the content of the (B) hydroxyl-containing copolymerizable monomer is preferably 0.1 to 10 parts by weight.

Preferably, the acrylic polymer contains, as the copolymerizable monomer group, at least one or more of (C) a hydroxyl group-containing nitrogen-containing vinyl monomer or an alkoxy group-containing (meth) acrylic acid alkyl ester monomer.

In (C), as the (C-1) nitrogen-containing vinyl monomer, a vinyl monomer containing a amine bond, a vinyl monomer containing an amine group, and a nitrogen monomer containing a nitrogen-containing heterocyclic structure may be mentioned. Vinyl monomers, etc. More specifically, N-vinyl-2-pyrrolidone, N-vinylpyrrolidone, methylvinylpyrrolidone, N-vinylpyridine, N-vinylpyridone, N-vinylpyrimidine, N-vinylpyrazine, N-vinylpyrazine, N-vinylpyrrole, N-vinylimidazole, N-vinyloxazole, N-vinylmorpholine, N-vinylcaprolactam, and N -Cyclic nitrogen vinyl compounds having N-vinyl substituted heterocyclic structures such as vinyl dodecylamine; N- (meth) acrylfluorenylmorpholine, N- (meth) acrylfluorenylfluorene Azine, N- (meth) propenylaziridine, N- (meth) propenylaziridine, N- (meth) propenylpyrrolidine, N- (meth) propenylpyrrolyl N- (meth) acrylfluorenyl azacycloheptane, N- (meth) acrylfluorenyl azacycloheptane, and N- (meth) acrylfluorenyl octane substituted heterocyclic structures Cyclic nitrogen vinyl compounds; cyclic nitrogens such as N-cyclohexylmaleimide and N-phenylmaleimide having a heterocyclic structure containing a nitrogen atom and a vinyl unsaturated bond in the ring Vinyl compound Unsubstituted or mono- (meth) acrylamide, N-methyl (meth) acrylamide, N-isopropyl (meth) acrylamide, and N-tert-butyl (meth) acrylamide Alkyl substituted (meth) acrylamide; N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N, N-dipropylpropene Ammonium amine, N, N-diisopropyl (meth) acrylamide, N, N-dibutyl (meth) acrylamide, N-ethyl-N-methyl (meth) acrylamide N-methyl-N-propyl (meth) acrylamide, and dialkyl substituted (meth) acrylamide, such as N-methyl-N-isopropyl (meth) acrylamide; N , N-dimethylaminomethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (methyl) Acrylate, N, N-dimethylaminoisopropyl (meth) acrylate, N, N-dimethylaminobutyl (meth) acrylate, N, N-diethylaminomethyl (Meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N-ethyl-N-methylaminoethyl (meth) acrylate, N -Methyl-N-propylaminoethyl (meth) acrylate, N-methyl-N-isopropylaminoethyl (meth) acrylate, N, N-dibutylaminoethyl (Meth) acrylates and dialkylamino (meth) acrylates such as tert-butylaminoethyl (meth) acrylate; N, N-dimethylaminopropyl (meth) Acrylamide, N, N-diethylaminopropyl (meth) acrylamide, N, N-dipropylaminopropyl (meth) acrylamide, N, N-diisopropyl Aminopropyl (meth) acrylamide, N-ethyl-N-methylaminopropyl (meth) acrylamide, N-methyl-N-propylaminopropyl (methyl) N, N-dialkyl substituted aminopropyl (meth) acrylamide, such as acrylamide and N-methyl-N-isopropylaminopropyl (meth) acrylamide; N-ethylene N-vinylcarboxylic acid amines such as methylformamide, N-vinylacetamide, and N-vinyl-N-methylacetamide; N-methoxymethyl (meth) acrylic acid Amine, N-ethoxyethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, diacetone acrylamide, and N, N-methylenebis ( Yl) acrylamide such as (meth) acrylamide-based; (meth) acrylonitrile, unsaturated carboxylic acid nitriles and the like.

The (C-1) nitrogen-containing vinyl monomer is preferably free of hydroxyl groups, and more preferably free of hydroxyl groups and carboxyl groups. As such a monomer, the monomers exemplified above are preferable, for example, an acrylic monomer containing an N, N-dialkyl-substituted amino group and an N, N-dialkyl-substituted amido group; N-vinyl- N-vinyl substituted lactams such as 2-pyrrolidone, N-vinylcaprolactam and N-vinyl-2-pyrimidone; N- (meth) acrylfluorenylmorpholine and N- ( N- (meth) acrylfluorenyl groups such as methyl) propenylpyrrolidine are substituted for cyclic amines.

In (C), examples of the (C-2) alkoxy-containing alkyl (meth) acrylate monomer include 2-methoxyethyl (meth) acrylate and (meth) acrylic acid 2-ethoxyethyl, 2-propoxyethyl (meth) acrylate, 2-isopropoxyethyl (meth) acrylate, 2-butoxyethyl (meth) acrylate, (methyl ) 2-methoxypropyl acrylate, 2-ethoxypropyl (meth) acrylate, 2-propoxypropyl (meth) acrylate, 2-isopropoxypropyl (meth) acrylate , 2-butoxypropyl (meth) acrylate, 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 3-propoxy (meth) acrylate Propyl ester, 3-isopropoxypropyl (meth) acrylate, 3-butoxypropyl (meth) acrylate, 4-methoxybutyl (meth) acrylate, 4-methyl (meth) acrylate Ethoxybutyl, 4-propoxybutyl (meth) acrylate, 4-isopropoxybutyl (meth) acrylate, 4-butoxybutyl (meth) acrylate, and the like.

These alkoxy group-containing (meth) acrylic acid alkyl ester monomers have a structure in which an alkyl group in the (meth) acrylic acid alkyl ester is substituted with an alkoxy group.

When the total amount of the acrylic polymer of the copolymer is set to 100 parts by weight, (C-1) a hydroxyl-containing nitrogen-containing vinyl monomer or (C-2) an alkoxy-containing (methyl) group is preferred. The content of the alkyl acrylate monomer is 0 to 20 parts by weight. (C-1) a hydroxyl group-containing nitrogen-containing vinyl monomer and (C-2) an alkoxy group-containing (meth) acrylic acid alkyl ester monomer may be used singly or in combination. More than two. The adhesive composition of the adhesive layer of the present invention may not include (C) a hydroxyl-containing nitrogen-containing vinyl monomer or an alkoxy-containing (meth) acrylic acid alkyl ester monomer.

The (D) difunctional or higher isocyanate compound may be at least one or two or more selected from polyisocyanate compounds having at least two or more isocyanate (NCO) groups in one molecule. Polyisocyanate compounds include classifications of aliphatic isocyanates, aromatic isocyanates, acyclic isocyanates, and alicyclic isocyanates, and the present invention may be any of them. Specific examples of the polyisocyanate compound include aliphatic isocyanates such as hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and trimethylhexamethylene diisocyanate (TMDI). Compounds; diphenylmethane diisocyanate (MDI), xylylene diisocyanate (XDI), hydrogenated xylylene diisocyanate (H6XDI), dimethyldiphenylene diisocyanate (TODI), and toluene diisocyanate ( TDI) and other aromatic isocyanate compounds.

Examples of the trifunctional or higher isocyanate compound include biuret-modified or isocyanurate-modified bifunctional isocyanate compounds (compounds having two NCO groups in one molecule), and trimethylol. Adducts (polyol modified products) of trivalent or higher polyhydric alcohols (compounds having at least three or more OH groups in one molecule) such as propane (TMP) or glycerol.

As the (D) difunctional or higher isocyanate compound, only (D-1) a trifunctional isocyanate compound or only (D-2) a difunctional isocyanate compound can be used. In addition, (D-1) a trifunctional isocyanate compound and (D-2) a difunctional isocyanate compound may be used in combination.

The (D-1) trifunctional isocyanate compound used in the present invention preferably includes at least one or more members selected from the group (D-1-1) of the first aliphatic isocyanate compound, and is selected from (D-1) -2) At least one or more of the second aromatic isocyanate compound group. Wherein, the (D-1-1) first aliphatic isocyanate compound group includes isocyanurate of hexamethylene diisocyanate compound, isocyanurate of isophorone diisocyanate compound, and hexamethylene diisocyanate compound. It is composed of the adduct of methylene diisocyanate compound, the adduct of isophorone diisocyanate compound, the biuret of hexamethylene diisocyanate compound, and the biuret of isophorone diisocyanate compound; The (D-1-2) second aromatic isocyanate compound group is composed of an isocyanurate of a toluene diisocyanate compound, an isocyanurate of a xylylene diisocyanate compound, and a hydrogenated xylylene diisocyanate. The compound is composed of an isocyanurate compound, an addition product of toluene diisocyanate compound, an addition product of xylylene diisocyanate compound, and an addition product of hydrogenated xylylene diisocyanate compound. It is preferred to use (D-1-1) the first aliphatic isocyanate compound group and (D-1-2) the second aromatic isocyanate compound group in combination. In the present invention, as the (D-1) trifunctional isocyanate compound, at least one or more selected from the (D-1-1) first aliphatic isocyanate compound group is used in combination and selected from (D-1-2) At least one or more of the second aromatic isocyanate compound group can further improve the balance of the adhesive force in the low-speed peeling region and the high-speed peeling region.

In addition, it is preferable that the (D-1) trifunctional isocyanate compound contains at least one or more kinds selected from the aforementioned (D-1-1) first aliphatic isocyanate compound group, and is selected from the aforementioned (D-1-2) second The total amount of at least one of the aromatic isocyanate compound group is 0.5 to 5.0 parts by weight based on 100 parts by weight of the copolymer. In addition, as at least one or more members selected from the (D-1-1) first aliphatic isocyanate compound group and at least one or more members selected from the (D-1-2) second aromatic isocyanate compound group The mixing ratio is preferably (D-1-1): (D-1-2) within a range of 10%: 90% to 90%: 10% by weight ratio.

The (D-2) difunctional isocyanate compound used in the present invention is preferably an acyclic aliphatic isocyanate compound and a compound formed by a reaction between a diisocyanate compound and a diol compound.

For example, when the diisocyanate compound is represented by the general formula "O = C = NXN = C = O" (where X is a divalent group), and when the general formula "HO-Y-OH" (where Y is a divalent group) When the group) represents a diol compound, examples of the compound produced by a reaction between the diisocyanate compound and the diol compound include compounds represented by the following general formula Z.

[Formula Z]

O = C = NX- (NH- CO-OYO-CO-NH-X) n -N = C = O

Here, n is an integer of 0 or more. When n is 0, the general formula Z is expressed as "O = C = N-X-N = C = O". The difunctional acyclic aliphatic isocyanate compound may include a compound in which n is 0 (a diisocyanate compound unreacted with respect to a diol compound) in the general formula Z, and a compound containing n as an integer of 1 or more as an essential component is preferable. The bifunctional acyclic aliphatic isocyanate compound may be a mixture of a plurality of compounds in which n is different in the general formula Z.

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

The diol compound represented by the general formula "HO-Y-OH" is an aliphatic diol. Preferably, Y is an acyclic aliphatic divalent group. The diol compound is preferably selected from 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, and 2-methyl-2-propyl-1,3. -Propylene glycol, 2-ethyl-2-butyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,2-dimethyl-1,3-propanediol monohydroxypivalic acid One or two or more of the compound group consisting of an ester, polyethylene glycol, and polypropylene glycol.

The weight ratio (D-1 / D-2) of the (D-1) trifunctional isocyanate compound to the (D-2) difunctional isocyanate compound is preferably 1 to 90. It is preferable that it is 0.1-10 weight part with respect to 100 weight part of said acrylic polymer, and the said (D) difunctional or more isocyanate compound.

In the case where a polyisocyanate compound is used as the crosslinking agent, the (E) crosslinking accelerator may be any substance that functions as a catalyst to function in the reaction (crosslinking reaction) of the copolymer and the crosslinking agent. : Amine compounds such as tertiary amines, metal chelates, organic tin compounds, organic lead compounds, organic zinc compounds and the like. In the present invention, a metal chelate compound or an organic tin compound is preferably used as the crosslinking accelerator.

The metal chelate is a compound in which one or more polydentate ligands L are bonded to a central metal atom M. The metal chelate may or may not have one or more monodentate ligands X bonded to the metal atom M. For example, when the general formula of a metal chelate 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 Ls 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 iron (Fe), nickel (Ni), manganese (Mn), chromium (Cr), vanadium (V), titanium (Ti), ruthenium (Ru), zinc (Zn), and aluminum ( Al), zirconium (Zr), tin (Sn), and the like.

Examples of the multidentate ligand L include methyl ethyl acetate, ethyl ethyl acetate, ethyl ethyl acetate, oleyl ethyl acetate, lauryl ethyl acetate, and stearyl ethyl acetate. β-keto esters; β-diketones such as acetoacetone (alias: 2,4-pentanedione), 2,4-hexanedione, and benzophenone acetone. They are keto-enol tautomers, and in the multidentate ligand L may also be enolates (eg, acetamidine acetonate) formed by deprotonation of the enol.

Examples of the monodentate ligand X include a halogen atom such as a chlorine atom and a bromine atom; pentamyl, hexyl, 2-ethylhexyl, octyl, nonyl, decyl, sulfanyl, and An alkoxy group such as stearyl, and the like; methoxy, ethoxy, n-propoxy, isopropoxy, and alkoxy such as butoxy.

Specific examples of the metal chelate include tris (2,4-pentanedione) iron (III), iron triacetamone acetone, titanium triacetamone acetone, titanium triacetamone ruthenium acetone, and diacetamone acetone. Zinc, aluminum triacetamate, zirconium tetraacetamone, tris (2,4-hexadione) iron (III), zinc (bis, 2,4-hexadione), tris (2,4-hexadione) ) Titanium, tris (2,4-hexadione) aluminum and tetras (2,4-hexadione) zirconium.

Examples of the organic tin compound include dialkyltin oxides, fatty acid salts of dialkyltin, and fatty acid salts of stannous acids. In the past, dibutyltin compounds have been used in most cases, but in recent years, the toxicity of organic tin compounds has been pointed out. In particular, tributyltin (TBT) contained in dibutyltin compounds is also a cause of concern. From the viewpoint of safety, a long-chain alkyltin compound such as a dioctyltin compound is preferred. Specific examples of the organotin compound include dioctyltin oxide and dioctyltin dilaurate. Although Sn compounds can also be used temporarily, in view of the tendency to use more safe substances in the future, it is preferable to use metal chelates such as Al, Ti, Fe, etc., which are safer than Sn.

The (E) crosslinking accelerator in the adhesive composition of the present invention is preferably at least one or more selected from the group consisting of an aluminum chelate, a titanium chelate, and an iron chelate.

The content of the crosslinking accelerator (E) is preferably 0.001 to 0.5 parts by weight based on 100 parts by weight of the copolymer.

Examples of (F) keto-enol tautomers include methyl ethyl acetate, ethyl ethyl acetate, octyl ethyl acetate, oleyl ethyl acetate, lauryl ethyl acetate, and ethyl acetate Β-ketoesters such as stearyl acetate; β-diketones such as acetoacetone, 2,4-hexanedione, and benzophenone acetone. In an adhesive composition using a polyisocyanate compound as a cross-linking agent, by blocking the isocyanate group of the cross-linking agent, they can suppress the excessive increase in the viscosity of the adhesive composition or gelation after the cross-linking agent is mixed. This phenomenon can extend the shelf life of the adhesive composition.

The content of the (F) keto-enol tautomer compound is preferably 0.1 to 200 parts by weight based on 100 parts by weight of the copolymer.

The (F) keto-enol tautomer compound has the effect of inhibiting the cross-linking as opposed to the (E) cross-linking accelerator. Therefore, it is preferable to appropriately set (F) the keto-enol tautomer compound to (E) ) Proportion of crosslinking accelerator. In order to extend the shelf life of the adhesive composition and improve storage stability, the weight ratio of (E) :( F) is preferably in the range of 1: 1 to 1: 500, more preferably 1:30 to 1: 500, and most preferably It is preferably 1:80 to 1: 500.

The acrylic polymer may optionally contain (G) a polyalkylene glycol mono (meth) acrylate monomer as the copolymerizable monomer group. As the (G) polyalkylene glycol mono (meth) acrylate monomer, as long as it is a compound in which one of a plurality of hydroxyl groups possessed by the polyalkylene glycol is esterified into a (meth) acrylate Just fine. Since the (meth) acrylate group is a polymerizable group, it can be copolymerized with a base polymer. The other hydroxyl group may be in the state of OH, may be an alkyl ether such as methyl ether and diethyl ether, or may be a saturated carboxylic acid ester such as acetate.

Examples of the alkylene group included in the polyalkylene glycol include, but are not limited to, ethylene, propylene, and butylene. The polyalkylene glycol may be a copolymer of two or more kinds of 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, and polyethylene glycol-polypropylene glycol-polybutylene glycol. The copolymer may be a block copolymer or a random copolymer.

It is preferred that the average number of alkylene oxides constituting the polyalkylene glycol chain in the (G) polyalkylene glycol mono (meth) acrylate monomer is 3 to 14. The "average repeating number of alkylene oxides" refers to the olefins in the "polyalkylene glycol chain" part contained in the molecular structure of the (G) polyalkylene glycol mono (meth) acrylate monomer. The average number of oxygenation unit repeats.

The (G) polyalkylene glycol mono (meth) acrylate monomer is preferably selected from the group consisting of polyalkylene glycol mono (meth) acrylate and methoxy polyalkylene glycol (methyl) ) At least one or more of acrylate and ethoxy polyalkylene glycol (meth) acrylate.

More specific examples include polyethylene glycol-mono (meth) acrylate, polypropylene glycol-mono (meth) acrylate, polybutylene glycol-mono (meth) acrylate, and polyethylene glycol. -Polypropylene glycol-mono (meth) acrylate, polyethylene glycol-polybutylene glycol-mono (meth) acrylate, polypropylene glycol-polybutylene glycol-mono (meth) acrylate, polyethylene glycol -Polypropylene glycol-polybutylene glycol-mono (meth) acrylate; methoxy polyethylene glycol- (meth) acrylate, methoxy polypropylene 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- (methyl Based) acrylate, ethoxy-polyethylene glycol-polybutylene glycol- (meth) acrylate, ethoxy-polypropylene glycol-polybutylene glycol- (meth) acrylate, ethoxy-poly Ethylene glycol-polypropylene glycol-polybutylene glycol- (meth) acrylate.

When the total amount of the acrylic polymer of the copolymer is set to 100 parts by weight, the content of the (G) polyalkylene glycol mono (meth) acrylate monomer is preferably 0 to 50 parts by weight. The adhesive composition in the adhesive layer of the present invention may not include (G) a polyalkylene glycol mono (meth) acrylate monomer.

The adhesive composition may optionally contain (H) a polyether-modified silicone compound. (H) The polyether-modified silicone compound is a silicone compound having a polyether group. In addition to the usual silicone unit (-SiR ¹ ₂ -O-), the polyether-modified silicone compound also has a polyether-containing silicon compound. Oxane units (-SiR ¹ (R ² O (R ³ O) _n R ⁴ ) -O-). Here, R ¹ represents one or two or more alkyl or aryl groups, R ² and R ³ represent one or two or more alkylene groups, and R ⁴ represents one or two or more alkyl groups, fluorenyl groups, and the like ( Terminal group). Examples of the polyether group include polyoxyalkylene groups such as a polyoxyethylene group ((C ₂ H ₄ O) _n ) and a polyoxypropylene group ((C ₃ H ₆ O) _n ).

The (H) polyether-modified silicone compound is preferably a polyether-modified silicone compound having an HLB value of 7 to 15. The content of the (H) polyether-modified silicone compound is preferably 0.01 to 1.0 parts by weight, and more preferably 0.1 to 0.5 parts by weight, based on 100 parts by weight of the copolymer.

HLB refers to a predetermined hydrophilic-lipophilic balance (a ratio of hydrophilicity to lipophilicity) specified in JIS K3211 (surfactant term).

(H) A polyether-modified silicone compound can be obtained, for example, by a method of grafting an organic compound having an unsaturated bond and a polyoxyalkylene group to a polyorganosiloxane having a silane group by a hydrosilylation reaction. Obtained from the main chain of oxane. Specific examples thereof include a dimethylsiloxane-methyl (polyoxyethylene) siloxane copolymer, and a dimethylsiloxane-methyl (polyoxyethylene) siloxane-methyl (poly (ethylene oxide)) (Propylene oxide) silicone copolymer and dimethylsilane-methyl (polyoxypropylene) silicone copolymer.

By mixing the (H) polyether-modified silicone compound with the adhesive composition, the adhesive force and reworkability of the adhesive can be improved. When the adhesive composition does not contain a polyether-modified silicone compound, the cost can be made lower.

In addition, as other components, a copolymerizable (meth) acrylic acid monomer containing an alkylene oxide, a (meth) acrylamide monomer, a dialkyl-substituted acrylamide monomer, Known additives such as surfactants, curing accelerators, plasticizers, fillers, curing inhibitors, processing aids, anti-aging agents, and antioxidants. These may be used alone or in combination of two or more.

As the copolymer of the main agent used in the adhesive composition of the present invention, at least one of (A) alkyl (meth) acrylate monomers having C4 to C18 carbon atoms can be selected from the group consisting of The copolymerizable monomer group is composed of (B) a hydroxyl-containing copolymerizable monomer, (C) a hydroxyl-free nitrogen-containing vinyl monomer, or an alkoxy-containing alkyl (meth) acrylate monomer. At least one of the copolymerizable monomer groups is synthesized by copolymerization. The copolymerizable monomer group may further contain (G) a polyalkylene glycol mono (meth) acrylate monomer. The polymerization method of the copolymer is not particularly limited, and an appropriate polymerization method such as solution polymerization or emulsion polymerization can be used.

The adhesive composition of the present invention may contain (D) a difunctional or higher isocyanate compound, (E) a cross-linking accelerator, (F) a keto-enol tautomer compound, and an appropriate amount. Of any additive.

The copolymer is preferably an acrylic polymer, and preferably contains 50 to 100% by weight of a (meth) acrylic acid ester monomer or an acrylic monomer such as (meth) acrylic acid or (meth) acrylamide.

Since the aforementioned acrylic polymer does not include a carboxyl-containing copolymerizable monomer as the copolymerizable monomer group, it is effective for improving the crosslinking speed and stabilizing the adhesive force. As a monomer which reacts with (D) a difunctional or higher isocyanate compound used as a crosslinking agent, (B) a hydroxyl-containing copolymerizable monomer is preferably used. As a preferable monomer composition of the said copolymer, the said (A) and the said (B) each one or more types, the said (A) and the said (B) and the said (C) one or more types, and the ( A) and one or more of the aforementioned (B) and (G), one or more of the aforementioned (A) and (B) and (C) and (G), and the like.

It is preferable that the adhesive force obtained by cross-linking the adhesive composition at a low peeling speed of 0.3 m / min is 0.05 to 0.1 N / 25 mm, and the adhesive force at a high peeling speed of 30 m / min is 1.0 N. / 25mm or less. As a result, a small change in the adhesive force with the peeling speed can be obtained, and the peeling can be performed quickly even in the case of high-speed peeling. In addition, even when the surface protection film is temporarily peeled for re-adhesion, an excessive force is not required, and it is easy to peel from the adherend.

The surface resistivity of the adhesive layer obtained by crosslinking the adhesive composition is preferably 5.0 × 10 ⁺¹² Ω / □ or less, and the peeling static voltage is “± 0.6 kV or less”. In addition, in the present invention, the term “± 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”. If the surface resistivity is large, the performance of discharging the static electricity generated by the charging at the time of peeling is poor. Therefore, by making the surface resistivity sufficiently small, it is possible to reduce the static electricity generated when the adhesive layer is peeled from the adherend. The peeling static voltage can suppress the influence on the electrical control circuit and the like of the adherend.

The gel fraction of the adhesive layer (crosslinked adhesive) obtained by crosslinking the adhesive composition of the present invention is preferably 95 to 100%. Because the gel fraction is so high, the adhesive force does not become too large at low peel speeds, reducing the phenomenon of dissolution of unpolymerized monomers or oligomers from the copolymer, which can improve reworkability, high temperature / high Durability under wet conditions and suppresses contamination by adherends.

The adhesive film of the present invention is formed by forming an adhesive layer on one or both sides of a resin film, and the adhesive layer is formed by crosslinking the adhesive composition of the present invention. In addition, the surface protective film of the present invention is formed by forming an adhesive layer on one side of a resin film, and the adhesive layer is formed by crosslinking the adhesive composition of the present invention. In the adhesive composition of the present invention, since each of the components (A) to (F) is blended in a good balance, it has excellent antistatic performance, and has an adhesive force at a low peeling speed and a high peeling speed. It is excellent in balance, durability, and reworkability (after drawing on a surface protective film with an adhesive pen through an adhesive layer, it does not transfer contamination to the adherend). Therefore, a surface protective film as a polarizing plate can be preferably used.

The thickness of the adhesive layer 2 used in the antistatic surface protection film 10 of the present invention is not particularly limited. For example, the thickness is preferably about 5 to 40 μm, and more preferably about 10 to 30 μm. When the antistatic surface protective film has a slightly adhesive adhesive layer 2 with a peeling strength (adhesive force) on the surface of the adherend of about 0.03 to 0.3 N / 25mm, the antistatic surface protective film is peeled from the adherend In this case, it is preferable because it has excellent operability. In addition, from the viewpoint of excellent workability when peeling the release film 5 from the antistatic surface protective film 10, the peel force of the release film 5 from the adhesive layer 2 is preferably 0.2 N / 50 mm or less.

In addition, the release film 5 used in the antistatic surface protection film 10 of the present invention is formed by forming a release agent layer 4 on one side of the resin film 3, and the release agent layer 4 is formed by using A resin composition containing a silicone as a main component of a release agent, a polysiloxane compound that is liquid at 20 ° C, and an antistatic agent is formed.

Examples of the resin film 3 include a polyester film, a polyamide film, a polyethylene film, a polypropylene film, and a polyimide film. From the viewpoint of excellent transparency and relatively low cost, a polyester film is particularly preferred. . The resin film may be an unstretched film, or a uniaxially stretched film or a biaxially stretched film. In addition, the stretching ratio of the stretched film and the orientation angle in the axial direction of the stretched film accompanying crystallization may be controlled to specific values.

The thickness of the resin film 3 is not particularly limited, and for example, a thickness of about 12 to 100 μm is preferable; a thickness of about 20 to 50 μm is easy to handle, so it is more preferable.

In addition, 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 a primer, as necessary.

Examples of the release agent comprising dimethyl polysiloxane as the main component of the release agent layer 4 include well-known polysiloxanes such as addition reaction type, condensation reaction type, cation polymerization type, and radical polymerization type. Class stripping agent. Examples of commercially available products of the addition reaction type polysiloxane-based release agent include KS-776A, KS-847T, KS-779H, KS-837, KS-778, and KS-830 (Shin-Etsu Chemical Industry Co., Ltd. Manufacturing Co., Ltd.); SRX-211, SRX-345, SRX-357, SD7333, SD7220, SD7223, LTC-300B, LTC-350G, LTC-310 (Dow Corning Toray Co., Ltd., Dow Corning Toray Co. , Ltd., etc.). As a commercially available product of a condensation reaction type, SRX-290, SYLOFF-23 (made by Dow Corning Toray Co., Ltd.), etc. are mentioned, for example. Examples of commercially available cationic polymerized products include TPR-66501, TPR-6500, UV9300, UV9315, and UV9430 (manufactured by Momentive Performance Materials Inc., Momentive Performance Materials Inc.), X62-7622 (Shin-Etsu Chemical Industry Co., Ltd.) Co., Ltd.) and so on. As a commercially available product of a radical polymerization type, for example, X62-7205 (manufactured by Shin-Etsu Chemical Industry Co., Ltd.) can be mentioned.

Examples of the polysiloxane compound constituting the release agent layer 4 that is liquid at 20 ° C. include polyether-modified polysiloxane, alkyl-modified polysiloxane, and methanol-modified fatty acid ester-modified polysiloxane. Siloxane, etc. In the present invention, in order to improve the antistatic property of the surface of the adhesive layer, a polysiloxane that is liquid at 20 ° C. and is compatible with the release agent layer containing dimethylpolysiloxane as a main component is used. Compound. From the uses of the present invention, polyether-modified polysiloxanes among the modified polysiloxane compounds are preferred. The polyether chain in the polyether-modified polysiloxane is composed of ethylene oxide (ethylene oxide), propylene oxide (propylene oxide), and the like. For example, by selecting the molecular weight of polyethylene oxide used in the side chain, it is possible to Adjust physical properties such as compatibility with polysiloxane and antistatic effect.

Examples of commercially available products of polyether-modified polysiloxane include KF-351A, KF-352A, KF-353, KF-354L, KF-355A, and KF-642 (Shin-Etsu Chemical Industry Co., Ltd. Co., Ltd.); SH8400, SH8700, SF8410 (Made by Dow Corning Toray Corporation); TSF-4440, TSF-44441, TSF-4445, TSF-4446, TSF-4450 (Momentive Performance (Manufactured by Materials Inc.); BYK-300, BYK-306, BYK-307, BYK-320, BYK-325, BYK-330 (manufactured by BYK-Chemie), and the like.

The amount of polysiloxane compound that is liquid at 20 ° C relative to the release agent containing dimethylpolysiloxane as the main component is based on the type of the polysiloxane compound and the degree of compatibility with the release agent. It is different, as long as it takes into consideration the peeling static voltage required when peeling the antistatic surface protective film from the adherend, the contamination property to the adherend, the adhesion characteristics, and the like, and it can be set.

As the antistatic agent constituting the release agent layer 4, it is preferable that the dispersibility of the release agent solution containing dimethylpolysiloxane as a main component is good, and the release agent containing dimethylpolysiloxane as a main component is not hindered. Cured antistatic agent. As such an antistatic agent, an alkali metal salt is preferable.

Examples of the alkali metal salt include a metal salt containing lithium (Li), sodium (Na), and potassium (K). Specifically, for example, a cation containing Li ⁺ , Na ⁺ , K ^+, or the like is preferably used. With Cl ^— , Br ^— , I ^— , BF ₄ ^— , PF ₆ ^— , SCN ^— , ClO ₄ ^— , CF ₃ SO ₃ ^— , (CF ₃ SO ₂ ) ₂ N ^— , (C ₂ F ₅ SO ₂ ) ₂ N ^— , (CF ₃ SO ₂ ) ₃ C ^— and other anions. Among them, LiBr, LiI, LiBF ₄ , LiPF ₆ , LiSCN, LiClO ₄ , LiCF ₃ SO ₃ , Li (CF ₃ SO ₂ ) ₂ N, Li (C ₂ F ₅ SO ₂ ) ₂ N, Li (CF ₃ SO ₂ ) ₃ C and other lithium salts. These alkali metal salts may be used alone or in combination of two or more. To stabilize the ionic substance, a compound containing a polyoxyalkylene structure may be added.

The amount of antistatic agent added to the release agent containing dimethylpolysiloxane as the main component varies depending on the type of the antistatic agent and the degree of affinity with the release agent, but it is considered that It is only necessary to set the peeling static voltage required for peeling the antistatic surface protective film, the contamination property of the adherend, the adhesive property, and the like.

There is no particular limitation on the method of mixing the release agent containing dimethylpolysiloxane as a main component, the polyether-modified polysiloxane, and the antistatic agent. Any one of the following mixing methods can be adopted: In a release agent containing dimethylpolysiloxane as a main component, a polyether-modified polysiloxane and an antistatic agent are added and mixed, and then a release agent is added for curing. A method of mixing catalysts and mixing them; after diluting a stripping agent containing dimethylpolysiloxane as a main component with an organic solvent in advance, adding a polyether-modified polysiloxane and an antistatic agent and a curing agent for the stripping agent, and A method of mixing; a method in which a release agent containing polysiloxane as a main component is diluted with an organic solvent in advance, a catalyst is added and mixed, and then a polyether-modified polysiloxane and an antistatic agent are added and mixed Wait. In addition, if necessary, materials such as an adhesion promoter such as a silane coupling agent, or a compound containing a polyoxyalkylene group to assist the antistatic effect may be added.

There is no particular limitation on the mixing ratio of the release agent containing dimethyl polysiloxane as the main component, the polyether-modified polysiloxane, and the antistatic agent. The solid content 100 of the release agent whose main component is alkane is preferably a polyether-modified polysiloxane and an antistatic agent at a ratio of about 5 to 100 in terms of solid content. Relative to the solid content 100 of the release agent containing dimethylpolysiloxane as the main component, if the polyether-modified polysiloxane and the antistatic agent are added in a proportion of less than 5 in terms of solid content, the antistatic agent The amount of transfer to the surface of the adhesive layer is also reduced, making it difficult for the adhesive layer to exert an antistatic function. In addition, compared to the solid content 100 of the release agent containing dimethylpolysiloxane as the main component, if the polyether-modified polysiloxane and the antistatic agent are added in an amount exceeding 100% in terms of solid content, it will result in The release agent containing dimethylpolysiloxane as a main component together with the polyether-modified polysiloxane and the antistatic agent is also transferred to the surface of the adhesive layer, and therefore, the adhesive characteristics of the adhesive layer may be reduced.

In the present invention, the method of forming the adhesive layer 2 on the base film 1 of the antistatic surface protective film 10 and the method of bonding the release film 5 can be performed by a known method, and are not particularly limited. Specifically, (1) The method of apply | coating the resin composition for forming the adhesive layer 2 on the single side | surface of the base film 1 and drying to form an adhesive layer, and sticking the release film 5 is mentioned. (2) A method of applying the resin composition for forming the adhesive layer 2 on the surface of the release film 5 and drying to form an adhesive layer, and then bonding the base film 1. Either method can be used.

In addition, when forming the adhesive layer 2 on the surface of the base film 1, it can be performed by a well-known method. Specifically, known coating methods such as reverse coating, doctor blade coating, gravure coating, slit extrusion coating, Mayer bar coating, and air knife coating can be used.

Similarly, when the release agent layer 4 is formed on the resin film 3, it can be performed by a well-known method. Specifically, well-known coating methods, such as gravure coating, Mylar bar coating, and air knife coating, can be used.

FIG. 2 is a cross-sectional view showing a state where the release film is peeled from the antistatic surface protection film of the present invention.

By peeling the release film 5 from the antistatic surface protective film 10 shown in FIG. 1, the release agent layer 4 contained in the release film 5 contains a polysiloxane compound and an antistatic agent (at 20 ° C.) that are liquid at 20 ° C. A part of the reference numeral 7) is transferred (attached) to the surface of the adhesive layer 2 of the antistatic surface protection film 10. Therefore, in FIG. 2, the spots indicated by the reference numeral 7 schematically show a polysiloxane compound and an antistatic liquid that are transferred to the surface of the adhesive layer 2 of the antistatic surface protective film at 20 ° C. Agent.

For the antistatic surface protective film of the present invention, when the antistatic surface protective film 11 shown in FIG. 2 after peeling off the release film is attached to an adherend, it is transferred to the surface of the adhesive layer 2. Polysiloxane compounds and antistatic agents that are liquid at 20 ° C will contact the surface of the adherend. This makes it possible to suppress the peeling static voltage when the antistatic surface protective film is peeled from the adherend again.

FIG. 3 is a cross-sectional view showing an embodiment of an optical component of the present invention.

In a state where the release film 5 is peeled from the antistatic surface protection film 10 of the present invention and the adhesive layer 2 is exposed, the adhesive layer 2 is adhered to the optical member 8 as an adherend.

That is, FIG. 3 shows the optical component 20 to which the antistatic surface protective film 10 of the present invention is bonded. Examples of the optical component 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 also serving as a lens film. Such an optical component is used as a component of a liquid crystal display device such as a liquid crystal display panel, various optical systems such as various measuring instruments, and the like. Examples of the optical component include optical films such as antireflection films, hard coat films, and transparent conductive films for touch panels. In particular, it can be suitably used as a low-reflection-treated polarizing plate (LR-polarizing plate) and an anti-glare low-reflection-processing polarizing plate (AG-LR) bonded to a surface which has been subjected to anti-pollution treatment with a polysiloxane compound, fluorine compound, or the like. An antistatic surface protective film on the surface of an optical film such as a polarizing plate).

According to the optical component of the present invention, when the antistatic surface protective film 10 is peeled off from the optical component (optical film) as an adherend, the peeling static voltage can be sufficiently suppressed to be low, so there is no need to worry about it. Destroying circuit components such as a driving IC, a TFT element, and a gate line driving circuit can improve the production efficiency in the process of manufacturing a liquid crystal display panel and the like, and ensure the reliability of the production process.

Examples

Hereinafter, the present invention is further explained by examples.

＜ Production of adhesive composition ＞

[Example 1]

Nitrogen was introduced into a reaction device equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen introduction tube, thereby replacing the air in the reaction device with nitrogen. Then, 100 parts by weight of 2-ethylhexyl acrylate and 5.0 parts by weight of 8-hydroxyoctyl acrylate were added to the reaction device, and 60 parts by weight of a solvent (ethyl acetate) was simultaneously added. Then, after 2 hours, 0.1 part by weight of azobisisobutyronitrile as a polymerization initiator was added dropwise and reacted at a temperature of 65 ° C. for 6 hours to obtain an acrylic copolymer solution of Example 1 having a weight average molecular weight of 500,000. . To this acrylic copolymer solution, 8.5 parts by weight of acetone acetone was added and stirred, and then 2.0 parts by weight of hexamethylene diisocyanate compound isocyanurate (trade name: Coronate HX (Colourator HX)) and 0.1 part by weight Titanium triacetamate was stirred and mixed to obtain the adhesive composition of Example 1.

[Examples 2 to 6 and Comparative Examples 1 to 3]

Except that each component of the adhesive composition of Example 1 was adjusted as shown in Tables 1 and 2, the same operations as in Example 1 were performed to obtain adhesive combinations of Examples 2 to 6 and Comparative Examples 1 to 3. Thing. In Tables 1 and 2, the monomers (copolymerized) contained in the acrylic copolymer are (A), (B), (C), (G), and "carboxyl-containing monomer".

Tables 1 and 2 are tables in which the entire table showing the mixing ratio of each component is divided into two parts, and the values in parentheses represent the weight parts of each component obtained by setting the total amount of group (A) to 100 parts by weight. Value. In addition, the compound names corresponding to the abbreviations of the respective components used in Tables 1 and 2 are shown in Tables 3 and 4. In addition, Coronate (コ ロ ネ ー ト, registered trademark) HX, Coronate HL and Coronate L are the trade names of Nippon Polyurethane Industry Co., Ltd., Takenate (タ ケ ネ ー ト, registered trademark) D-140N, D- 127N and D-110N are trade names of Mitsui Chemicals Corporation.

<Synthesis of difunctional isocyanate compound>

The difunctional isocyanate compounds of Synthesis Examples 1 and 2 were synthesized by the following method. That is, as shown in Tables 5 and 6, the diisocyanate and the diol compound were mixed at a molar ratio of NCO / OH = 16, reacted at 120 ° C for 3 hours, and then removed under reduced pressure using a thin film evaporation device. Unreacted diisocyanate yields the desired difunctional isocyanate compound.

＜ Manufacture of antistatic surface protection film ＞

[Example 1]

5 parts by weight of an addition reaction type polysiloxane (product name: SRX-345, manufactured by Dow Corning Toray Co., Ltd.) and 0.15 parts by weight of a polyether were modified Polysiloxane (product name SH8400, manufactured by Dow Corning Toray Co., Ltd.), 5 parts by weight of lithium perchlorate in 10% ethyl acetate solution, 95 parts by weight Parts of toluene and ethyl acetate mixed solvent of 1: 1, and 0.05 parts by weight of a platinum catalyst (product name: SRX-212 Catalyst (catalyst), manufactured by Dow Corning Toray Co., Ltd.) were mixed together and stirred The coating material which formed the release agent layer of Example 1 was mixed. The paint used to form the release agent layer of Example 1 was applied to a 38 μm-thick polyethylene terephthalate film using a Mailer rod so that the thickness after drying was 0.2 μm. The surface was dried in a hot-air loop-type oven at 120 ° C for 1 minute to obtain a release film of Example 1.

The adhesive composition of Example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm so that the thickness after drying was 20 μm, and then returned to the hot air at 100 ° C. Dry in a ring oven for 2 minutes to form an adhesive layer. Then, on the surface of this adhesive layer, the release agent layer (polysiloxane treatment surface) of the release film of Example 1 manufactured above was stuck. The obtained adhesive film was kept in an environment at 40 ° C. for 5 days to cure the adhesive, and an antistatic surface protective film of Example 1 was obtained.

[Examples 2 to 6]

The antistatic surface protective films of Examples 2 to 6 were obtained in the same manner as in Example 1 except that each of the adhesive compositions of Example 1 was set to the adhesive compositions of Examples 2 to 6.

[Comparative Example 1]

5 parts by weight of an addition reaction type polysiloxane (product name is SRX-345, manufactured by Dow Corning Toray Corporation), 95 parts by weight of a mixed solvent of toluene and ethyl acetate of 1: 1, and 0.05 parts by weight of a platinum catalyst (product name: SRX-212 Catalyst, manufactured by Dow Corning Toray Co., Ltd.) was mixed together and stirred to prepare a coating material for forming a release agent layer of Comparative Example 1. The paint used to form the release agent layer of Comparative Example 1 was applied to a 38 μm-thick polyethylene terephthalate film using a Mailer rod so that the thickness after drying was 0.2 μm. The surface was dried in a hot-air loop-type oven at 120 ° C for 1 minute, and a release film of Comparative Example 1 was obtained.

The adhesive composition of Comparative Example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm so that the thickness after drying was 20 μm, and then returned to the hot air at 100 ° C. Dry in a ring oven for 2 minutes to form an adhesive layer. Then, on the surface of this adhesive layer, the release agent layer (polysiloxane treatment surface) of the release film of Comparative Example 1 produced as described above was bonded. The obtained adhesive film was held in an environment at 40 ° C. for 5 days to cure the adhesive, and 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 adhesive composition of Comparative Example 1 was replaced with the adhesive composition of Comparative Example 2.

[Comparative Example 3]

An antistatic surface protective film of Comparative Example 3 was obtained in the same manner as in Example 1 except that the adhesive composition of Example 1 was replaced with the adhesive composition of Comparative Example 3.

The composition and thickness of the release agent layer in the antistatic surface protective films of Examples 1 to 6 and Comparative Examples 1 to 3 are shown in Table 7.

＜ Test method and evaluation ＞

After the surface protective films of Examples 1 to 6 and Comparative Examples 1 to 3 were aged at 23 ° C and 50% RH for 7 days, the release film (PET coated with silicone (polysiloxane) resin was peeled off. Film) to expose the adhesive layer and serve as a sample for measuring surface resistivity.

Furthermore, the exposed surface protective film of the adhesive layer was pasted on the surface of the polarizing plate pasted on the liquid crystal cell through the adhesive layer, left for 1 day, and then subjected to autoclave treatment at 50 ° C. and 5 atmospheres for 20 minutes. After being left at room temperature for 12 hours, it was used as a sample for measuring the adhesive force, peeling static voltage, and reworkability.

＜ Adhesiveness ＞

A tensile tester was used to peel the measurement sample obtained above at a low peeling speed (0.3 m / min) and a high peeling speed (30 m / min) in the direction of 180 ° (a 25 mm wide surface protective film was bonded together) A sample formed on the surface of a polarizing plate), the peeling strength was measured, and the peeling strength was used as an adhesive force.

＜ Surface resistivity ＞

After aging and before bonding to the polarizing plate, peel off the peeling film (PET film coated with silicone resin) to expose the adhesive layer, and use a resistivity meter (model HirestaUP-HT450 (HI-RESPU UP-HT450) Mitsubishi Chemical Analysis) (Manufactured by Mitsubishi Chemical Analytech Co., Ltd.), and measured the surface resistivity of the adhesive layer.

＜ Peeling Static Voltage ＞

Using high-precision electrostatic sensors SK-035 and SK-200 (manufactured by Keyence Corporation), the measurement was performed at 180 ° at a tensile speed of 30 m / min. At the time of peeling, the voltage (static voltage) generated by the electrification of the polarizing plate was taken as the maximum value of the measured value as the peeling static voltage.

＜ Reworkability ＞

After drawing on the surface protective film of the measurement sample obtained above with a ball pen (load 500 g, 3 times back and forth), peel the surface protective film from the polarizing plate, observe the surface of the polarizing plate, and confirm whether the pollution is transferred to the polarizing plate. . Evaluation target standard: When the pollution is not transferred to the polarizing plate, it is evaluated as "○"; when it is confirmed that the trajectory drawn along the ball-point pen is at least locally transferred, it is evaluated as "△"; when it is confirmed that there is a trace along the ball-point pen The evaluation was “×” when contamination was transferred and the release of the adhesive was also confirmed from the surface of the adhesive.

The evaluation results are shown in Table 8. In the surface resistivity, “mE + n” is used to represent “m × 10 ^{+ 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 protection films of Examples 1 to 6 of the present invention have proper adhesion and do not pollute the surface of the adherend, and the peeling static voltage when peeling the antistatic surface protection film from the adherend is low.

On the other hand, in the antistatic surface protective film of Comparative Example 1 in which a polysiloxane compound and an antistatic agent were added to the adhesive layer, the surface resistivity of the adhesive layer was low and good, but the adhesive force was large. For this reason, the peeling static voltage is high and the reworkability is poor. In Comparative Example 2, the adhesive may be gelled due to the large amount of the cross-linking accelerator added, and coating may not be performed. In addition, in Comparative Example 3, since a carboxyl group-containing monomer was included, the adhesive force was large and the reworkability was slightly inferior.

That is, in Comparative Examples 1 and 2 in which a polysiloxane compound and an antistatic agent were mixed in an adhesive, it was difficult to satisfy both the reduction of the peeling static voltage and the improvement of the contamination of the adherend. On the other hand, Examples 1 to 6 in which a polysiloxane compound and an antistatic agent were added to a release agent layer, and then the polysiloxane compound and the antistatic agent were transferred to the surface of the adhesive layer. The added amount achieves the effect of reducing the peeling static voltage, so there is no pollution to the adherend, and a good antistatic surface protective film is obtained.

Industrial applicability

The antistatic surface protective film of the present invention can be applied to, for example, optical films such as polarizing plates, retardation plates, and lens films for displays. In addition, in the production process of various optical components, the optical components can be protected. And other surfaces. 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 whose surface has been subjected to antifouling treatment with a polysiloxane compound, a fluorine compound, or the like, it can be reduced. The amount of static electricity generated when peeling from the adherend.

The antistatic surface protection film of the invention has less pollution to the adherend, does not deteriorate with time (does not deteriorate over time), and has excellent anti-peeling electrostatic performance, so it can improve the yield of the production process. The industrial use value is high.

1‧‧‧ substrate film
2‧‧‧ Adhesive layer
3‧‧‧ resin film
4‧‧‧ peeling agent layer
5‧‧‧ peeling film
7‧‧‧Polysiloxane compounds and antistatic agents that are liquid at 20 ℃
8‧‧‧ Adhered body (optical component)
10‧‧‧Anti-static surface protective film
11‧‧‧Antistatic surface protective film after peeling off the film
20‧‧‧ Optical components with antistatic surface protective film

1 is a schematic cross-sectional view of an antistatic surface protective film of the present invention. FIG. 2 is a schematic cross-sectional view showing a state where a release film is peeled from the antistatic surface protective film of the present invention. 3 is a cross-sectional view of an embodiment of an optical component of the present invention.

1‧‧‧ substrate film

2‧‧‧ Adhesive layer

3‧‧‧ resin film

4‧‧‧ peeling agent layer

5‧‧‧ peeling film

7‧‧‧Polysiloxane compounds and antistatic agents that are liquid at 20 ℃

10‧‧‧Anti-static surface protective film

Claims (9)

An antistatic surface protective film is sequentially manufactured through the following steps (1) to (2): Step (1): The adhesive composition is crosslinked on one side of a substrate film made of a transparent resin, and A step of forming an adhesive layer; the adhesive composition includes: at least one of (A) alkyl (meth) acrylate monomers having a carbon number of C4 to C18, and a copolymer selected from the group consisting of copolymerizable The monomer group consists of (B) a hydroxyl-containing copolymerizable monomer and (C) a hydroxyl-free nitrogen-containing vinyl monomer or an alkoxy-containing (meth) acrylic alkyl ester monomer and (G) An acrylic polymer of a copolymer obtained by copolymerizing at least one copolymerizable monomer group composed of a polyalkylene glycol mono (meth) acrylate monomer, (D) an isocyanate compound having a difunctional or higher functionality, (E) a cross-linking accelerator and (F) a keto-enol tautomer; and a ratio of the (F) keto-enol tautomer to the (E) cross-linking accelerator Let the weight ratio of (E) :( F) be 1: 80 ~ 1: 500; step (2): peeling off by laminating a release agent layer containing an antistatic agent on one side of the resin film A step of transferring the antistatic agent of the release agent layer to the surface of the adhesive layer by attaching the release agent layer to the surface of the adhesive layer; the release agent layer is formed by A polyether-modified polysiloxane containing a release agent containing dimethyl polysiloxane as a main component, and a polysiloxane compound that is liquid at 20 ° C, and The antistatic agent resin composition is formed, and the polyether modified resin contains the polyether modified resin in a proportion of 5 to 100 based on the solid content of the stripping agent containing dimethylpolysiloxane as a main component. Polysiloxane and the antistatic agent; the peeling static voltage of the adhesive layer is ± 0.6kV or less; the inside of the adhesive layer does not contain an antistatic agent; the antistatic agent in the release agent layer The electrostatic agent is an alkali metal salt; the acrylic polymer does not include a carboxyl-containing copolymerizable monomer. The antistatic surface protective film according to claim 1, wherein the (E) crosslinking accelerator is at least one selected from the group consisting of an aluminum chelate, a titanium chelate, and an iron chelate. the above. The antistatic surface protective film according to claim 1 or 2, wherein the (B) hydroxyl-containing copolymerizable monomer is selected from the group consisting of (meth) acrylic acid 8-hydroxyoctyl ester and (meth) acrylic acid 6 -Hydroxyhexyl ester, 4-hydroxybutyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide And at least one or more of the compound group consisting of N-hydroxyethyl (meth) acrylamide. The antistatic surface protective film according to claim 1 or 2, wherein the (G) polyalkylene glycol mono (meth) acrylate monomer is selected from polyalkylene glycol mono (methyl) At least one or more of acrylate, methoxy polyalkylene glycol (meth) acrylate, and ethoxy polyalkylene glycol (meth) acrylate. The antistatic surface protection film according to claim 1 or 2, wherein for the (D) difunctional or higher isocyanate compound, The difunctional isocyanate compound is an acyclic aliphatic isocyanate compound and is a compound formed by the reaction of a diisocyanate compound and a diol compound; the diisocyanate compound is an aliphatic diisocyanate and is selected from the group consisting of tetramethylene diisocyanate Pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, and lysine diisocyanate; the diol compound is selected from the group consisting of 2 -Methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2-ethyl-2-butyl- Compounds composed of 1,3-propanediol, 3-methyl-1,5-pentanediol, 2,2-dimethyl-1,3-propanediol monohydroxypivalate, polyethylene glycol, and polypropylene glycol One of the group; as a trifunctional isocyanate compound is an isocyanurate of a hexamethylene diisocyanate compound, an isocyanurate of an isophorone diisocyanate compound, an adduct of a hexamethylene diisocyanate compound Adduct of isophorone diisocyanate, hexamethylene Biuret of diisocyanate compound, biuret of isophorone diisocyanate compound, isocyanurate of toluene diisocyanate compound, isocyanurate of xylylene diisocyanate compound, hydrogenated xylylene An isocyanurate of a diisocyanate compound, an adduct of a toluene diisocyanate compound, an adduct of a xylylene diisocyanate compound, and an adduct of a hydrogenated xylylene diisocyanate compound. The antistatic surface protection film according to claim 1 or 2, wherein the adhesive composition contains a polyether-modified silicone compound having a (H) HLB value of 7 to 15. An antistatic surface protective film is formed by cross-linking an adhesive composition on one side of a substrate film made of a resin having transparency to form an adhesive layer, and forming an adhesive layer on the adhesive layer. On the surface, a release agent film in which a release agent layer containing an antistatic agent is laminated on one side of a resin film is bonded by the release agent layer; the adhesive composition includes; A) At least one of the (meth) acrylic acid ester monomers having C4 to C18 alkyl groups and (B) a copolymerizable monomer containing (B) a hydroxyl group and (C ) Non-hydroxyl-containing nitrogen-containing vinyl monomer or alkoxy-containing alkyl (meth) acrylate monomer and (G) polyalkylene glycol mono (meth) acrylate monomer Acrylic polymer consisting of copolymers copolymerized with at least one copolymerizable monomer group, (D) difunctional or higher isocyanate compound, (E) crosslinking accelerator, and (F) keto-enol intervariability Structured compound; and the ratio of the (F) keto-enol tautomer to the (E) crosslinking accelerator is set to a weight ratio of (E) :( F) of 1: 80 ~ 1: 500; The release agent layer is modified by a polyether containing a release agent containing dimethylpolysiloxane as a main component and a liquid polysiloxane compound at 20 ° C. It is formed by a resin composition of a siloxane and an antistatic agent, and the solid content 100 of the release agent mainly containing dimethylpolysiloxane is contained in a ratio of 5 to 100 in terms of solid content. Polyether-modified polysiloxane and the antistatic agent; the inside of the adhesive layer does not contain an antistatic agent, and the antistatic agent of the release agent layer is transferred to the surface of the adhesive layer; The antistatic agent in the release agent layer is an alkali metal salt; The acrylic polymer does not include a carboxyl-containing copolymerizable monomer. An optical film to which the antistatic surface protective film according to claim 7 is bonded. An optical component to which the antistatic surface protective film according to claim 7 is bonded.