TWI681871B - Surface-protective film and optical component attached with the same - Google Patents

Abstract

The present invention provides a surface-protective film that can be used even for an optical film having an uneven surface, and for which there is little contamination of the adherend and for which the low contamination property of the adherend does not change over time, and which has excellent peeling antistatic performance that does not deteriorate over time, and an optical component attached with the same. In accordance with the present invention, in a surface-protective film 10 in which an adhesive layer 2 is formed on one surface of a base film 1 including a transparent resin and a peeling film 5 having a release agent layer 4 is attached on the adhesive layer 2, the peeling film 5 has the release agent layer 4 containing a release agent having a long-chain alkyl group-containing resin as the main component and an antistatic agent including an ionic compound that does not react with the release agent laminated on one surface of a resin film 3, a component of the antistatic agent is transferred to a surface of the adhesive layer 2 from the peeling film 5, and the peeling charge pressure is reduced when the adhesive layer 2 is peeled from the adherend.

Description

Surface protective film and optical component to which the surface protective film is attached

The present invention relates to a surface protective film bonded to the surface of an optical component such as a polarizing plate, a retardation plate, and a lens film for display (hereinafter, sometimes referred to as "optical film"). In more detail, a surface protection film with little pollution to adherends is provided, and further a surface protection film, which has no deterioration over time (no deterioration over time) and has excellent anti-peeling electrostatic properties, and a sticker An optical component incorporating this surface protection film.

When manufacturing and transporting optical films such as polarizing plates, phase difference plates, lens films for displays, anti-reflection films, hard coating films, transparent conductive films for touch panels, and optical products such as displays using them, The surface of the optical film is bonded to a surface protection film to prevent surface contamination and scratches in subsequent steps. In order to save labor and time after peeling the surface protective film and then attaching it to improve work efficiency, for the appearance inspection of the optical film as a product, the surface protective film is sometimes attached to the optical film Direct implementation in the state.

Conventionally, in order to prevent the adhesion of scratches and dirt during the manufacturing process of optical products, a surface protective film provided with an adhesive layer on one side of the base film is generally used. The surface protective film is attached to the adhesive layer with a slight adhesive force On the optical film. The reason for setting the adhesive layer to a micro-adhesive force is that it can be easily peeled off when the used surface protective film is removed from the surface of the optical film, and in order to prevent the adhesive from adhering and remaining on the adherend The phenomenon of the optical film of the product (so-called preventing the occurrence of adhesive residue).

In recent years, in the production steps of liquid crystal display panels, the peeling static voltage generated when the surface protective film attached to the optical film is peeled off and removed, which may destroy circuits such as driver ICs for controlling the display screen of the liquid crystal display The orientation of the components and the liquid crystal molecules can be damaged. Although the number of occurrences of these phenomena is small, they also occur.

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 tends to decrease. Recently, it is required to control the stripping static voltage in the range of +0.7kV~-0.7kV.

In addition, in recent years, with the spread of 3D displays (stereoscopic displays), FPR (Film Patterned Retarder) films are sometimes bonded to the surfaces of optical films such as polarizing plates. After peeling off the surface protective film bonded to the surface of the optical film such as a polarizing plate, the FPR film is bonded. However, when the surface of the optical film such as a polarizing plate is contaminated with the adhesive or antistatic agent used for the surface protection film, there is a problem that it is difficult to adhere the FPR film. Therefore, the surface protection film used for this purpose is required to have less pollution to the adherend.

On the other hand, in some liquid crystal panel manufacturers, as the evaluation method of the contamination of the adherend by the surface protective film, the following method is adopted: first, the surface protective film attached to the optical film such as a polarizing plate is peeled off , Re-lamination is carried out with air bubbles mixed in, and the re-laminated objects are under specified conditions Under heat treatment, then peel off the surface protection film and observe the surface of the adherend. In this evaluation method, even if the contamination of the surface of the adherend is trace, if there is a difference in the contamination of the surface of the adherend between the part mixed with the bubble and the part of the surface protection film adhesive, it will be regarded as a bubble Traces (sometimes called "bubble stains") remain. Therefore, as an evaluation method of the contamination of the surface of the 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 does not have a problem with the surface contamination of the adherend is required.

In order to prevent defects caused by the high peeling static voltage when peeling the surface protective film from the optical film as the adherend, a surface protective film has been proposed which uses an antistatic agent for reducing the peeling static voltage Adhesive layer.

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

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

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

In addition, Patent Document 4 discloses a binder 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.

【Prior Technical Literature】 【Patent Literature】

[Patent Document 1] Japanese Patent Laid-Open No. 2005-131957

[Patent Document 2] Japanese Patent Laid-Open No. 2005-330464

[Patent Document 3] Japanese Patent Laid-Open No. 2005-314476

[Patent Document 4] Japanese Patent Laid-Open No. 2005-152235

In the above-mentioned Patent Documents 1 to 4, an antistatic agent is added inside the adhesive layer. However, the thicker the thickness of the adhesive layer, and the more the antistatic dose moves from the adhesive layer to the adherend to which the surface protective film is adhered as time passes after being adhered to the adherend. If there is a large amount of antistatic dose that moves to the adherend, the appearance quality of the optical film as the adherend may decrease, or the adhesion of the FPR film may decrease when the FPR film is bonded.

If the thickness of the adhesive is reduced to reduce the time-dependent change of the antistatic agent from the adhesive layer to the adherend, other problems may occur. For example, when used for optical films with irregularities on the surface of anti-glare polarizing plates and the like applied to anti-glare, there is a problem that the adhesive cannot follow the irregularities on the surface of the optical film and mix bubbles, or, Since the bonding area between the optical film and the adhesive is reduced to reduce the bonding force, the surface protection film floats or peels off during use.

The present invention has been completed in view of the above circumstances, and its object is to provide an optical film having irregularities on the surface that can be used and adhered to A surface protective film with little pollution of the appendage, low pollution to the adherend that does not change with time, and a surface protective film with excellent anti-stripping static performance without deterioration over time, and the use of the surface protection Optical components of the film.

The present inventors have carefully studied this subject.

In order to reduce the contamination of the adherend and also the temporal change of the contaminant, it is necessary to reduce the amount of antistatic agent presumed to cause contamination of the adherend. However, when the amount of the antistatic agent is reduced, the peeling static voltage when the surface protective film is peeled off from the adherend becomes high. The present inventors studied a method of suppressing the peeling static voltage when peeling off the surface protective film from the adherend 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 and mixing to form an adhesive layer, the adhesive composition containing no antistatic agent was coated and dried to laminate the adhesive layer, and then the adhesive layer was combined with The release film with the release agent layer containing an antistatic agent is bonded in such a way that the release agent layer is in contact, and an appropriate amount of antistatic agent is transferred from the release film side to the surface of the adhesive layer, thereby obtaining a charge amount capable of suppressing the release Based on the above findings and completed the present invention.

That is, the present invention provides a surface protection film in which an adhesive layer is formed on one surface of a base film made of a resin having transparency, and a peeling layer having a peeling agent layer is bonded to the adhesive layer The surface protection film of the film, wherein the release film is formed by laminating a release agent layer on one side of the resin film, and the release agent layer contains a release agent containing a long-chain alkyl group-containing resin as a main component and is not compatible with the An antistatic agent composed of an ionic compound that reacts with the release agent, as described above The antistatic agent component is transferred from the peeling film to the surface of the adhesive layer to reduce the peeling static voltage when peeling the adhesive layer from the adherend.

In addition, it is preferable that the adhesive layer is formed by crosslinking a (meth)acrylate copolymer.

In addition, the surface potential when peeled from the optical film as the adherend is preferably +0.7 kV to -0.7 kV.

In addition, it is preferable that the peeling force of the peeling film when peeling from the adhesive layer is 0.005 to 0.3 N/50 mm.

In addition, the present invention provides an optical component to which the above surface protective film is bonded.

The surface protective film of the present invention has little pollution to the adherend, and the low-pollution property of the adherend has no change with time. In addition, according to the present invention, even an optical film having irregularities on the surface such as an AG polarizing plate to be adhered can be used. In addition, according to the surface protection film of the present invention, it is possible to provide a low static voltage that can be suppressed when peeling off from an optical film as an adherend, and has excellent anti-stripping static performance without deterioration over time. A surface protective film and an optical component using the surface protective film.

According to the surface protection film of the present invention, the surface of the optical film can be reliably protected, and therefore, the production efficiency and the yield can be improved.

1‧‧‧ Base film

2‧‧‧ adhesive layer

3‧‧‧Resin film

4‧‧‧ Stripping agent layer

5‧‧‧ peel film

7‧‧‧Antistatic agent

8‧‧‧adhered body (optical parts)

10‧‧‧Surface protective film

11‧‧‧The surface protective film after peeling off the peeling film

20‧‧‧Optical components with surface protective film attached

FIG. 1 is a cross-sectional view showing the concept of the surface protection film of the present invention.

2 is a diagram showing a state after the peeling film is peeled off from the surface protection film of the present invention Profile view.

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

[For the implementation of the invention]

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

FIG. 1 is a schematic cross-sectional view showing the surface protection film of the present invention. In this surface protection film 10, an adhesive layer 2 is formed on the surface of one side of the transparent base film 1. A release film 5 is formed on the surface of the adhesive layer 2. 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 surface protection film 10 of the present invention, a base film made of a resin having transparency and flexibility is used. Thus, the appearance inspection of the optical component can be performed in a state where the surface protective film is attached to the optical component that is the adherend. For the film made of a transparent resin used as the base film 1, polyethylene terephthalate, polyethylene naphthalate, and polyethylene isophthalate are preferably used ), polyester films such as polybutylene terephthalate. As the base film, as long as it has required strength and has optical adaptability, a film made of other resins can be used in addition to the polyester film. The base film 1 may be an unstretched film, or a film to which uniaxial stretching or biaxial stretching is applied. In addition, the stretching ratio of the stretched film and the orientation angle of the stretched film in the axis direction accompanying crystallization may be controlled to specific values.

The thickness of the base film 1 used in the surface protective film 10 of the present invention is not particularly limited, for example, it is preferably about 12 to 100 μm; if it is about 20 to 50 μm, it is easy to handle, so it is more Preferably.

In addition, if necessary, a surface of the base film 1 opposite to the surface on which the adhesive layer 2 is formed may be provided with an antifouling layer for preventing surface contamination, an antistatic layer, a hard coating layer for preventing scratches, etc. . 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 a primer.

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

Examples of (meth)acrylate copolymers include copolymers obtained by copolymerizing main monomers with copolymerization monomers and functional monomers, and the main monomers include n-butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, isononyl acrylate, etc.; examples of the comonomer include acrylonitrile, vinyl acetate, methyl methacrylate, ethyl acrylate, etc.; the functionality Examples of the monomer include acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate, glycidyl methacrylate, N-methylolmethacrylamide, and the like. In the (meth)acrylate copolymer, both the main monomer and other monomers may be (meth)acrylates, or may contain one or more than two (meth)acrylic acid as monomers other than the main monomer. Monomers other than esters.

In addition, the (meth)acrylate copolymer and the compound containing polyoxyalkylene (polyoxyalkylene) may be copolymerized or mixed. Examples of the copolymerizable polyoxyalkylene group-containing compound include polyethylene glycol (400) monoacrylate and polyethylene glycol (400) monomethacrylic acid Ester, methoxypolyethylene glycol (400) acrylate, methoxypolyethylene glycol (400) methacrylate, polypropylene glycol (400) monoacrylate, polypropylene glycol (400) monomethacrylate, Methoxy polypropylene glycol (400) acrylate, methoxy polypropylene glycol (400) methacrylate, etc. By copolymerizing these polyoxyalkylene group-containing monomers with the main monomers and functional monomers of the aforementioned (meth)acrylate copolymer, a bond composed of a polyoxyalkylene group-containing copolymer can be obtained Agent.

As the polyoxyalkylene group-containing compound that can be mixed with the (meth)acrylate copolymer, the (meth)acrylate copolymer containing a polyoxyalkylene group is preferred, and the polyoxyalkylene group-containing compound is more preferred. (Meth)acrylic monomer polymer, for example, polyethylene glycol (400) monoacrylate, polyethylene glycol (400) monomethacrylate, methoxypolyethylene glycol ( 400) Acrylate, methoxypolyethylene glycol (400) methacrylate, polypropylene glycol (400) monoacrylate, polypropylene glycol (400) monomethacrylate, methoxypolypropylene glycol (400) acrylate , Methoxy polypropylene glycol (400) methacrylate and other polymers. By mixing these polyoxyalkylene group-containing compounds with the aforementioned (meth)acrylate copolymer, a binder to which the polyoxyalkylene group-containing compound is added can be obtained.

The curing agent added to the adhesive layer 2 may be an isocyanate compound, an epoxy compound, a melamine compound, a metal chelate compound, or the like as a crosslinking agent that crosslinks the (meth)acrylate copolymer. In addition, examples of the thickener include rosins, coumarone-indenes, terpenes, petroleum, and phenols.

For the adhesive layer 2 used in the surface protection film 10 of the present invention The thickness 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 peeling strength (adhesive force) of the surface protective film on the surface of the adherend is about 0.03~0.3N/25mm, and the adhesive layer 2 has a slight adhesion, the operation when peeling the surface protective film from the adherend Excellent, so it is preferred. In addition, from the viewpoint of excellent operability when peeling the peeling film 5 from the surface protective film 10, it is preferable that the peeling force of the peeling film 5 peeled from the adhesive layer 2 is at a peeling speed of 0.3 m/min and a peeling angle of 180° When the conditions are measured, it is 0.005~0.3N/50mm.

In addition, the release film 5 used in the surface protection film 10 of the present invention is formed by laminating a release agent layer 4 on one surface of the resin film 3, and the release agent layer 4 contains a resin containing a long-chain alkyl group as The main component of the stripping agent and an antistatic agent composed of an ionic compound that does not react with the stripping agent.

Examples of the resin film 3 include polyester films, polyamide films, polyethylene films, polypropylene films, and polyimide films. From the viewpoint of excellent transparency and relatively low cost, polyester films are 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 of the stretched film in the axis direction accompanying crystallization may be controlled to specific values.

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 16 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 and application of a primer, if necessary.

As the release agent layer 4, a resin containing a long-chain alkyl group is used as The stripping agent of the main component can be exemplified by amino alkyd resins containing long-chain alkyl groups, acrylic resins containing long-chain alkyl groups, long-chain aliphatic pendant resins (selected from polyvinyl alcohol, ethylene/vinyl alcohol copolymerization) The reaction product between at least one active hydrogen-containing polymer, polyethyleneimine and hydroxyl-containing cellulose derivative, and a long-chain alkyl group-containing isocyanate) and other known long-chain alkyl groups Agent. It may be a release agent that adds a curing agent and an ultraviolet initiator to perform a curing reaction, or may be a release agent that volatilizes and cures the solvent.

The "long-chain alkyl group" is preferably an alkyl group having 8 to 30 carbon atoms, and the carbon number may be 10 or more, 12 or more, 18 or less, 24 or less, and among them, a linear alkyl group is preferable. Specific examples include decyl, undecyl, lauryl, dodecyl, tridecyl, myristyl, tetradecyl, pentadecyl, cetyl, palm One or more than two kinds of alkyl groups, hexadecyl, heptadecyl, stearyl, octadecyl, nonadecyl, eicosyl, behenyl, etc.

)(註冊商標)RA-30；一方社油脂工業股份有限公司製造的Piroiru(

)(註冊商標)1010、Piroiru 1010S、Piroiru 1050、Piroiru HT；中京油脂股份有限公司製造的Resem N-137；花王股份有限公司製造的Exceparl(

)(註冊商標)PS-MA；日立化成股份有限公司製造的Tess Fine(

)(註冊商標)303等。 As a commercially available product of a resin-based stripper containing a long-chain alkyl group, for example, ASHIO RESIN (made by ASHIO CO., LTD.

) (Registered trademark) RA-30; Piroiru (produced by Ichisha Oil Industry Co., Ltd.)

) (Registered trademark) 1010, Piroiru 1010S, Piroiru 1050, Piroiru HT; Resem N-137 manufactured by Zhongjing Oil and Fats Co., Ltd.; Exceparl (manufactured by Kao Co., Ltd.)

) (Registered trademark) PS-MA; Tess Fine (made by Hitachi Chemical Co., Ltd.)

) (Registered trademark) 303, etc.

As the antistatic agent formed of an ionic compound that constitutes the release agent layer 4, it is preferable for a release agent having a long-chain alkyl group-containing resin as a main component The dispersibility of the solution is good, and the antistatic agent that does not hinder the curing of the release agent containing the long-chain alkyl-containing resin as the main component. In order to impart an antistatic effect to the adhesive layer in order to move from the release agent layer 4 to the surface of the adhesive layer 2, it is preferably an antistatic agent that does not react with a release agent containing a long-chain alkyl-containing resin as a main component .

The ionic compound is an ionic compound having a cation and an anion, and examples of the cation include pyridinium cation, imidazolium cation, pyrimidinium cation, pyrazolium cation, pyrrolium cation, and ammonium cation. Onium cation, phosphonium cation, manganese cation, etc. The nitrogen-containing onium cation may have an organic group such as an alkyl group or a substituent. It is preferably a quaternary nitrium cation, and examples thereof include quaternary pyridinium cations such as 1-alkylpyridinium (carbon atoms at 2 to 6 positions may or may not have a substituent), and 1,3-dioxane. Quaternary imidazolium cations (carbon atoms at positions 2, 4, and 5 may or may not have substituents) and N-alkylpyrimidinium (carbon atoms at positions 2 and 4 to 6) Quaternary pyridinium cations that may or may not have substituents), 1,2-dialkylpyrazolium (carbon atoms at positions 3 to 5 may or may not have substituents), etc. Quaternary ammonium cations such as quaternary pyrazolium cations, 1,1-dialkylpyrrolidinium (carbon atoms at positions 2 to 5 may or may not have substituents), and quaternary ammoniums such as tetraalkylammonium Cation, etc. Examples of the phosphonium cation include a phosphonium cation having an organic group such as tetraalkylphosphine. Examples of the sulfonium cation include sulfonium cations having an organic group such as trialkyl alkane.

Further, as the anion, include ^{_{C n H 2n + 1 COO -}} , C n F 2n + 1 COO -, NO 3 -, C n F 2n + 1 SO 3 -, (C n F 2n + 1 SO 2) _{^{2 N -, (C n F}} 2n + 1 SO 2) 3 C -, RC 6 H 4 SO 3 -, PO 4 3-, AlCl 4 -, Al 2 Cl 7 -, ClO 4 -, BF 4 -, PF _{^{6 -, AsF 6 -, SbF}} 6 -, SCN - and so on. These ionic compounds 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 antistatic agent added to the release agent that contains a long-chain alkyl-containing resin as the main component varies according to the type of antistatic agent and the degree of affinity with the release agent. It can be considered from the adherend The peeling static voltage required when peeling the surface protective film, the contamination of the adherend, the adhesion characteristics, etc. are set.

There is no particular limitation on the mixing method of the release agent and the antistatic agent which comprise the resin containing the long-chain alkyl group as the main component, which constitutes the release agent layer 4. Either of the following mixing methods can be used: a method of adding an antistatic agent to a stripping agent that contains a long-chain alkyl-containing resin as a main component, and then adding and mixing a catalyst for curing the stripping agent; it is adopted in advance After diluting the stripping agent containing the long-chain alkyl group-containing resin as the main component, an antistatic agent and a catalyst for curing the stripping agent are added and mixed; an organic solvent is used to dilute the long-chain alkyl group-containing resin in advance After the component release agent, a catalyst is added and mixed, and then an antistatic agent is added and mixed, and the like. In addition, if necessary, a material such as an adhesion promoter such as a silane coupling agent or a compound containing a polyoxyalkylene group may be added to assist in the antistatic effect.

There is no particular limitation on the mixing ratio of the release agent containing the long-chain alkyl group-containing resin as the main component and the antistatic agent, but it is relative to the solid of the release agent containing the long-chain alkyl group-containing resin as the main component. Component 100 is preferably an antistatic agent in a ratio of about 5 to 150 in terms of solid content. Relative to Yihanchang The solid content of the release agent of the alkyl group resin as the main component is 100. If the addition amount of the antistatic agent in terms of solid content is less than 5, the amount of transfer of the antistatic agent to the surface of the adhesive layer becomes small, which is difficult Make the adhesive layer play an antistatic function. In addition, with respect to the solid component 100 of the release agent containing a long-chain alkyl-containing resin as a main component, if the addition amount of the antistatic agent in terms of solid content exceeds 150, it will cause a long The release agent of the chain alkyl resin as the main component will also be transferred to the surface of the adhesive layer, therefore, the adhesive properties 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 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, there may be mentioned: (1) A method of applying the resin composition for forming the adhesive layer 2 on one side of the base film 1 and drying it to form the adhesive layer, and then bonding the release film 5 (2) The resin composition used to form the adhesive layer 2 is coated on the surface of the release film 5 and dried to form the adhesive layer, and then the method of bonding the base film 1 and the like. Either method can be used.

In addition, when the adhesive layer 2 is formed on the surface of the base film 1, a known method can be used. Specifically, known coating methods such as reverse coating, comma blade coating, gravure coating, slit-type extrusion coating, Mayer bar coating, and air knife coating can be used.

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

For the surface protection film 10 of the present invention having the above-mentioned configuration, from The surface potential when the optical film as the adherend is peeled off is preferably +0.7 kV to -0.7 kV. Furthermore, the surface potential is more preferably +0.5 kV to -0.5 kV, and particularly preferably the surface potential is +0.3 kV to -0.3 kV. This surface potential can be adjusted by changing the kind, addition amount, etc. of the antistatic agent contained in the release agent layer.

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

By peeling off the peeling film 5 from the surface protective film 10 shown in FIG. 1, a part of the antistatic agent (reference numeral 7) contained in the peeling agent layer 4 of the peeling film 5 is transferred (attached) to the surface The surface of the adhesive layer 2 of the protective film 10. Therefore, in FIG. 2, the antistatic agent attached to the surface of the adhesive layer 2 of the surface protective film is schematically shown by the spots of reference numeral 7. By transferring the components of the antistatic agent 7 from the release film 5 to the surface of the adhesive layer 2, compared with the adhesive layer 2 before the transfer, the peeling static voltage when the adhesive layer 2 is peeled off from the adherend is reduced. In addition, the peeling static voltage when peeling the adhesive layer from the adherend can be measured by a known method. For example, after attaching the surface protective film to the adherend such as a polarizing plate, the surface is peeled at a peeling speed of 40 m per minute using a high-speed peeling tester (manufactured by TESTER Sangyo Co., Ltd.) While protecting the film, use a surface potentiometer (manufactured by Keyence Corporation) to measure the surface potential of the surface of the adherend every 10 ms, and take the maximum value of the absolute value of the surface potential at this time as the peeling static voltage ( kV).

The surface protection film of the present invention is an antistatic agent transferred to the surface of the adhesive layer 2 when the surface protection film 11 shown in FIG. 2 with the peeling film peeled off is attached to the adherend Make contact with the surface of the adherend. By this operation, peeling when the surface protective film is peeled off from the adherend again can be suppressed to a low level Isolation voltage.

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

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

That is, FIG. 3 shows the optical component 20 to which the surface protection film 10 of the present invention is bonded. Examples of optical components include optical films such as polarizing plates, retardation plates, lens films, polarizing plates that also serve as phase difference plates, and polarizing plates that also serve as lens films. Such optical components are used as components of liquid crystal display devices such as liquid crystal display panels, optical system devices of various measuring instruments, and the like. In addition, as the optical member, an optical film such as an anti-reflection film, a hard coating film, and a transparent conductive film for a touch panel can also be mentioned.

According to the optical component of the present invention, when the surface protective film 10 is peeled off from the optical component (optical film) as the adherend, the peeling static voltage can be sufficiently suppressed to a low level. Therefore, there is no fear that the circuit components such as the driver IC, the TFT element, the gate line driver circuit, etc. will be damaged, the production efficiency in the steps of manufacturing the liquid crystal display panel and the like can be improved, and the reliability of the production steps can be ensured.

【Example】

Hereinafter, the present invention will be further described by examples.

(Manufacture of surface protection film)

(Example 1)

、註冊商標)HX”，日本聚氨酯工業股份有限公司(Nippon Polyurethane Industry Co.,Ltd.)製造)而形成塗抹液，將該塗抹液以使乾燥後的厚度成為20μm的方式塗布於厚度為38μm的聚對苯二甲酸乙二醇酯膜的表面，然後通過100℃的熱風迴圈式烘爐乾燥2分鐘，從而形成了黏結劑層。然後，在該黏結劑層的表面，貼合了上述製造的實施例1的剝離膜的剝離劑層(剝離劑處理面)。在40℃的環境下將所得到的黏結膜保溫5天，以使黏結劑固化，獲得了實施例1的表面保護膜。 3.125 parts by weight of a release agent containing a long-chain alkyl-containing resin as a main component (product name is "Tess Fine 303", manufactured by Hitachi Chemical Co., Ltd.), 0.5 parts by weight of tri-n-butylmethylammonium bis(trifluoromethyl Sulfonamide (FC-4400, manufactured by 3M Company), 96.875 parts by weight of a mixed solvent of toluene and ethyl acetate of 50:50, 0.09 parts by weight of catalyst (product name is "Dryer 900", Hitachi Chemical Co., Ltd. Co., Ltd.) was mixed together and stirred and mixed, and the paint for forming the release agent layer of Example 1 was prepared. Using a Mailer bar, the coating for the release agent layer of Example 1 was applied to the surface of a polyethylene terephthalate film with a thickness of 38 μm so that the thickness after drying became 0.2 μm, and It was dried for 1 minute in a 120 degreeC hot air circulation oven, and the peeling film of Example 1 was obtained. On the other hand, 2-ethylhexyl acrylate and 2-hydroxyethyl acrylate were copolymerized in a weight ratio of 100:4 to obtain an acrylate copolymer having a weight average molecular weight of 470,000, and the acrylate copolymer was 30 weight Parts are dissolved in 70 parts by weight of ethyl acetate to obtain a binder (ethyl acetate solution with a solid content of 30%), and 1.2 parts by weight of HDI are added and mixed with respect to 100 parts by weight of the binder Curing agent (product name is "Coronate(

, Registered trademark) HX", manufactured by Nippon Polyurethane Industry Co., Ltd.) to form a coating liquid, and the coating liquid is applied to a thickness of 38 μm so that the thickness after drying becomes 20 μm The surface of the polyethylene terephthalate film was then dried in a hot air loop oven at 100°C for 2 minutes to form an adhesive layer. Then, the surface of the adhesive layer was bonded to the above manufacturing The release agent layer (release agent-treated surface) of the release film of Example 1. The obtained adhesive film was kept in an environment of 40°C for 5 days to cure the adhesive, and the surface protective film of Example 1 was obtained.

(Example 2)

1.5 parts by weight of a stripper containing a long-chain alkyl group-containing resin as the main component (product name is "Piroiru 1010S", Yifang Company Oil Industry Co., Ltd. Company), 0.5 parts by weight of tri-n-butylmethylammonium bis(trifluoromethanesulfonyl)imide (FC-4400, manufactured by 3M Company), 98 parts by weight of toluene and ethyl acetate and isopropanol are 50:40: The mixed solvents of 10 were mixed together and stirred and mixed, and a coating material for forming the release agent layer of Example 2 was prepared. Using a Mailer bar, the coating for the release agent layer of Example 2 was applied to the surface of a polyethylene terephthalate film with a thickness of 38 μm so that the thickness after drying became 0.2 μm, and It was dried for 1 minute in a 120 degreeC hot-air circulation oven, and the peeling film of Example 2 was obtained. A protective film of Example 2 was obtained in the same manner as Example 1 except that the release film of Example 2 was used instead of the release film of Example 1.

(Comparative example 1)

)(註冊商標)HX”，日本聚氨酯工業股份有限公司(Nippon Polyurethane Industry Co.,Ltd.)製造)而形成塗抹液，並將該塗抹液以使乾燥後的厚度成為20μm的方式塗布於厚度為38μm的聚對苯二甲酸乙二醇酯膜的表面，然後通過100℃的熱風迴圈式烘爐乾燥2分鐘，從而形成了黏結劑層。然後，在該黏結劑層的表面，貼合了上述所製造的比較例1的剝離膜的剝離劑層(聚矽氧烷處理面)。將所得到的黏著膜在40℃的環境下保溫5天，以使黏結劑固化，獲得了比較例1的表面保護膜。 3.125 parts by weight of a release agent containing a long-chain alkyl-containing resin as a main component (product name is "Tess Fine 303", manufactured by Hitachi Chemical Co., Ltd.), 96.875 parts by weight of toluene and ethyl acetate are 50:50 The mixed solvent and 0.09 parts by weight of the catalyst (product name "Dryer 900", manufactured by Hitachi Chemical Co., Ltd.) were mixed together and stirred and mixed, and a paint forming the release agent layer of Comparative Example 1 was prepared. Using a Mailer bar, the paint for the release agent layer of Comparative Example 1 was applied to the surface of a polyethylene terephthalate film with a thickness of 38 μm so that the thickness after drying became 0.2 μm, and It was dried for 1 minute in a 120 degreeC hot air circulation oven, and the peeling film of Example 1 was obtained. On the other hand, with respect to 100 parts by weight of the binder of Example 1 (ethyl acetate solution with a solid content of 30%), 1.5 parts by weight of tri-n-butylmethylammonium bis(trifluoromethanesulfonyl) sulfoxide was added and mixed Amine (FC-4400, manufactured by 3M Company), 1.2 parts by weight of HDI curing agent (product name is "Coronate(

) (Registered trademark) HX", manufactured by Nippon Polyurethane Industry Co., Ltd.) to form a coating liquid, and the coating liquid is applied to a thickness of such that the thickness after drying becomes 20 μm The surface of the 38μm polyethylene terephthalate film was then dried in a hot air loop oven at 100°C for 2 minutes to form an adhesive layer. Then, the surface of the adhesive layer was bonded The release agent layer (polysiloxane-treated surface) of the release film of Comparative Example 1 manufactured above. The obtained adhesive film was kept in an environment of 40°C for 5 days to cure the adhesive, and Comparative Example 1 was obtained Surface protective film.

(Comparative example 2)

A surface protective film of Comparative Example 2 was obtained in the same manner as in Example 2 except that tri-n-butylmethylammonium bis(trifluoromethanesulfonyl)imide was not added to the release agent layer.

The method and results of the evaluation test are shown below.

(Measurement method of surface resistivity of adhesive layer)

，註冊商標)-UP，在外加電壓100V、測定時間30秒的條件下，測定了表面保護膜的黏結劑層的表面電阻率。測定時，將貼合了黏結劑層和剝離劑層而成的黏結膜在40℃的環境下保溫5天，然後從黏結膜上剝下剝離膜，測定了黏結膜的黏結劑層的表面電阻率。 Using Hiresta (made by Mitsubishi Chemical Corporation)

, Registered trademark)-UP, the surface resistivity of the adhesive layer of the surface protective film was measured under the conditions of an applied voltage of 100 V and a measurement time of 30 seconds. During the measurement, the adhesive film formed by bonding the adhesive layer and the release agent layer was kept at 40°C for 5 days, and then the peeling film was peeled off from the adhesive film to measure the surface resistance of the adhesive layer of the adhesive film rate.

<Measurement method of peeling force of peeling film>

The sample of the surface protection film was cut with a width of 50 mm and a length of 150 mm. Under a test environment of 23°C×50%RH, a tensile tester was used to peel the peeling film at a peeling speed of 300 mm/min in the direction of 180°, the strength at this time was measured, and this was used as the peeling force of the peeling film (N /50mm).

<Measurement method of adhesion of surface protective film>

An anti-glare low-reflection polarized plate (AG-LR polarized plate) was bonded to the surface of the glass plate using a laminating machine. Then, the surface protective film cut to a width of 25 mm was attached to the surface of the polarizing plate, and then stored in a test environment of 23° C.×50% RH for 1 day. Then, using a tensile tester, the surface protective film was peeled in the direction of 180° at a peeling speed of 300 mm/min, the strength at this time was measured, and this was used as the adhesive force (N/25 mm).

<Measurement method of peeling static voltage of surface protective film>

An anti-glare low-reflection polarized plate (AG-LR polarized plate) was bonded to the surface of the glass plate using a laminating machine. Then, the surface protective film cut to a width of 25 mm was attached to the surface of the polarizing plate, and then stored in a test environment of 23° C.×50% RH for 1 day. Then, while using a high-speed peeling tester (manufactured by TESTER Sangyo Co., Ltd.) to peel off the surface protective film at a peeling speed of 40 m per minute, a surface potentiometer (Kean Co., Ltd.) was used. (Manufactured by Keyence Corporation) The surface potential of the polarizing plate surface is measured every 10 ms, and the maximum value of the absolute value of the surface potential at this time is taken as the peeling static voltage (kV).

<Method for confirming surface contamination of surface protective film>

An anti-glare low-reflection polarized plate (AG-LR polarized plate) was bonded to the surface of the glass plate using a laminating machine. Then, the surface protective film cut to a width of 25 mm was attached to the surface of the polarizing plate, and then stored in a test environment of 23° C.×50% RH for 3 days and 30 days. Then, the surface protective film was peeled off, and the presence or absence of contamination on the surface of the polarizing plate was visually observed to confirm the surface contamination. As a criterion for surface contamination, when there is no contamination transfer on the polarizing plate, it is judged as (○), when the polarizing plate is confirmed It is judged as (×) when there is contamination on the transfer.

The obtained surface protective films of Examples 1-2 and Comparative Examples 1-2 were measured, and the measurement results are shown in Table 1. Among them, "2EHA" refers to 2-ethylhexyl acrylate, "HEA" refers to 2-hydroxyethyl acrylate, "303" refers to Tess Fine 303, "AS agent" refers to tri-n-butyl methyl ammonium bis (three (Fluorosulfonamide) imine, "Dryer" means Dryer 900, "1010S" means Piroiru 1010S.

In addition, the OR of the surface resistivity in the table is the abbreviation of "Over Range", which means that it exceeds the measurement range of the surface resistance meter (Hiresta-UP), which means the surface resistivity is 1E+13Ω/□ the above. In addition, the surface resistivity is expressed by the exponential notation method prescribed in JIS X 0210. For example, 2.0E+12 refers to the 12th power of 2.0×10.

表面電阻率：單位是Ω/□，2.0E+12的表記是指2.0×10的12次乘方。

Surface resistivity: The unit is Ω/□, and the notation of 2.0E+12 refers to the 12th power of 2.0×10.

From the measurement results shown in Table 1, the following is known.

The surface protective films of Examples 1 to 2 of the present invention have proper adhesion, and There is no pollution to the surface of the adherend, and the peeling static voltage when peeling the surface protective film from the adherend is low. On the other hand, for the surface protective film of Comparative Example 1 to which the antistatic agent was added to the adhesive layer, although the peeling static voltage when peeling the surface protective film from the adherend was low and good, it was good for the adherend after peeling. Of pollution. In addition, in Comparative Example 2 in which no antistatic agent was used, although the contamination to the adherend was improved, the peeling static voltage when the surface protective film was peeled from the adherend was high.

【Industrial Utilization】

The surface protective film of the present invention can be applied to optical films such as polarizing plates, retardation plates, lens films, and the like, and can be used by being bonded to the optical components in the production steps of various optical components and the like. To protect its surface. In addition, the surface protective film of the present invention can reduce the amount of static electricity generated when peeled off from the adherend, and the anti-stripping static performance does not change with time and has little pollution to the adherend, which can improve the yield of the production step. The industrial use value is large.

1‧‧‧ Base film

2‧‧‧ adhesive layer

3‧‧‧Resin film

4‧‧‧ Stripping agent layer

5‧‧‧ peel film

7‧‧‧Antistatic agent

10‧‧‧Surface protective film

Claims (5)

A surface protection film, which is a surface protection film in which an adhesive layer is formed on a single surface of a base film made of a transparent resin, and a release film having a release agent layer is bonded to the adhesive layer , Wherein the release film is formed by laminating a release agent layer on one side of the resin film, the release agent layer contains a release agent containing a long-chain alkyl group-containing resin as a main component and does not react with the release agent The antistatic agent composed of an ionic compound, by peeling off the peeling film from the surface protective film, a part of the antistatic agent component is transferred from the peeling film to the surface of the adhesive layer, reducing the The peeling static voltage when the adhesive layer is peeled from the adherend. The surface protection film as described in item 1 of the patent application range, wherein the adhesive layer is formed by crosslinking a (meth)acrylate copolymer. The surface protection film as described in item 1 or 2 of the patent application, wherein the surface potential when peeled from the optical film as the adherend is +0.7 kV to -0.7 kV. The surface protection film according to item 1 or 2 of the patent application range, wherein the peeling force of the peeling film when peeling from the adhesive layer is 0.005 to 0.3 N/50 mm. An optical component to which the surface protective film as described in any one of items 1 to 4 of the patent application range is bonded.

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