CN106010324B - Surface protection film and optical component bonded with same - Google Patents
Surface protection film and optical component bonded with same Download PDFInfo
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- CN106010324B CN106010324B CN201610089997.1A CN201610089997A CN106010324B CN 106010324 B CN106010324 B CN 106010324B CN 201610089997 A CN201610089997 A CN 201610089997A CN 106010324 B CN106010324 B CN 106010324B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/201—Adhesives in the form of films or foils characterised by their carriers characterised by the release coating composition on the carrier layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/21—Anti-static
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2551/00—Optical elements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/314—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive layer and/or the carrier being conductive
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2467/00—Presence of polyester
- C09J2467/005—Presence of polyester in the release coating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2483/00—Presence of polysiloxane
- C09J2483/005—Presence of polysiloxane in the release coating
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesive Tapes (AREA)
- Laminated Bodies (AREA)
- Polarising Elements (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention provides a surface protection film and an optical component using the surface protection film, the surface protection film can be used for an optical film with concave-convex surface, the pollution to an adherend is less, the low pollution property to the adherend is not changed with time, and the surface protection film has excellent stripping antistatic performance without time degradation. The surface protection film (10) is formed with an adhesive layer (2) on one surface of a base material film (1) composed of a transparent resin, the adhesive layer (2) contains an ionic compound as an antistatic agent, a stripping film (5) with a stripping agent layer (4) is adhered on the adhesive layer (2), the stripping agent layer (4) is composed of an alkali metal salt and a silicone stripping agent, the alkali metal salt component is transferred from the stripping film to the surface of the adhesive layer, and the stripping electrostatic pressure is reduced when stripping the adhesive layer from an adherend.
Description
Technical Field
The present invention relates to a surface protection film that is attached to a surface of an optical member (hereinafter, also referred to as an optical film) such as a polarizing plate (polarizing plate), a retardation plate, or a lens film for display. More specifically, the present invention provides a surface protective film which is less contaminated with an adherend and has excellent antistatic property in peeling without deterioration with time, and an optical member to which the surface protective film is bonded.
Background
In the production and transportation of optical films such as polarizing plates, retardation plates, lens films for displays, antireflection films, hard coat films, and transparent conductive films for touch panels, and optical products such as displays using these, a surface protective film is bonded to the surface of the optical film to prevent surface fouling and damage in the subsequent steps. In order to save the process of peeling off the surface protective film and then bonding the surface protective film, and to improve the work efficiency, the visual inspection of the optical film as a product may be performed in a state where the surface protective film is bonded to the optical film.
In the production process of optical products, surface protection films having an adhesive layer on one surface of a base film have been used for a long time in order to prevent scratches and adhesion of dirt. The surface protective film is bonded to the optical film via an adhesive layer having a weak adhesive force. The reason why the adhesive layer has a weak adhesive force is to enable easy peeling when a used surface protective film is peeled off and removed from the surface of an optical film, and to prevent the adhesive from adhering and remaining on the optical film as a product to be adhered (to prevent the occurrence of so-called adhesive residue).
In recent years, in a production process of a liquid crystal display panel, the following phenomena occur, although the number of generated products is small: due to the peeling static voltage generated when the surface protective film bonded to the optical film is peeled off and removed, circuit elements such as a driver IC for controlling a display screen of the liquid crystal display panel are broken and the alignment of liquid crystal molecules is damaged.
In addition, in order to reduce power consumption of the liquid crystal display panel, the driving voltage of the liquid crystal material is lowered, and the breakdown voltage of the driver IC is also lowered. Recently, the peeling electrostatic voltage is required to be in the range of +0.7kV to-0.7 kV.
Further, in the conventional polarizing plate, a triacetyl cellulose film (TAC film) is bonded to both sides of a polarizer (polarizer) made of iodine-impregnated polyvinyl alcohol (PVA) with an aqueous adhesive to protect the polarizer, but in recent years, the following polarizing plates have been used: polarizing plates using an acrylic film, a cyclic polyolefin film, a polyester film instead of the TAC film; a polarizing plate using an ultraviolet-curable adhesive instead of an aqueous adhesive. The change in the constituent materials of the polarizing plate causes the following problems: the peeling static voltage generated when the surface protective film is peeled off and removed is higher than that when the polarizing plate with the conventional structure is used.
In addition, with the recent spread of 3D displays (stereoscopic displays), an FPR (Film Patterned Retarder) Film may be bonded to the surface of an optical Film such as a polarizing plate. After peeling off the surface protection film bonded to the surface of an optical film such as a polarizing plate, an FPR film is bonded. However, there is a problem that the FPR film is difficult to adhere when the surface of the optical film such as a polarizing plate is contaminated with an adhesive or an antistatic agent used for a surface protection film. Therefore, a surface protective film for this application is required to have less contamination to an adherend.
On the other hand, some liquid crystal panel manufacturers have adopted a method of, as a method of evaluating the staining property of a surface protective film to an adherend, peeling off the surface protective film bonded to an optical film such as a polarizing plate, bonding the surface protective film again in a state where air bubbles are mixed, performing a heating treatment under predetermined conditions, and then peeling off the surface protective film to observe the surface of the adherend. In this evaluation method, even if the surface of the adherend is slightly contaminated, if the surface of the adherend is contaminated differently between a portion where air bubbles are mixed and a portion of the surface protective film which comes into contact with the adhesive, traces of air bubbles (also referred to as air bubble eruption ジミ in japanese) remain. Therefore, as a method for evaluating the staining property on the surface of the adherend, a very strict evaluation method is used. In recent years, there has been a demand for a surface protective film which has no problem in staining properties to the surface of an adherend even in the results judged by such a strict evaluation method.
There is proposed a surface protective film which comprises: in order to prevent a problem caused by a high peeling static voltage when peeling a surface protective film from an optical film as an adherend, an antistatic agent-containing pressure-sensitive adhesive layer is used which suppresses the peeling static voltage to a low peeling static voltage.
For example, patent document 1 discloses a surface protective film using a binder composed of an alkyltrimethylammonium salt, a hydroxyl group-containing acrylic polymer, and a polyisocyanate.
Patent document 4 discloses an adhesive composition comprising an ionic liquid, an alkali metal salt, and a polymer having a glass transition temperature of 0 ℃ or lower, and a surface protective film using the adhesive composition.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2005-131957
Patent document 2: japanese unexamined patent application publication No. 2005-330464
Patent document 3: japanese unexamined patent publication No. 2005-314476
Patent document 4: japanese unexamined patent publication No. 2006-152235
Disclosure of Invention
Technical problem to be solved by the invention
In the surface protective films described in patent documents 1 to 4, an antistatic agent is added to the inside of the adhesive layer. Therefore, the thicker the thickness of the pressure-sensitive adhesive layer is, or the longer the time after the pressure-sensitive adhesive layer is attached to the adherend, the more the antistatic agent tends to transfer from the pressure-sensitive adhesive layer to the adherend in the adherend to which the surface protection film is attached. When the amount of the antistatic agent transferred to the adherend is increased, the appearance quality of the optical film as the adherend may be deteriorated, or the adhesiveness of the FPR film may be deteriorated when the FPR film is bonded.
In order to reduce the change with time of the antistatic agent transferred from the pressure-sensitive adhesive layer to the adherend, another problem arises when the thickness of the pressure-sensitive adhesive layer is reduced. For example, there are problems as follows: in the case of an optical film having irregularities on the surface, such as an antiglare polarizing plate, used for antiglare purposes, the adhesive cannot follow the irregularities on the surface of the optical film and bubbles are mixed; the bonding force is reduced by the reduction of the bonding area between the optical film and the adhesive, and the surface protective film is lifted and peeled off during use.
In addition, in order to reduce the change with time of the antistatic agent transferred from the adhesive layer to the adherend, if the amount of the antistatic agent added to the adhesive layer is reduced, there is a risk that the following phenomenon occurs: the phenomenon of high peeling electrostatic voltage, breakdown of circuit elements such as a driver IC, or destruction of the orientation of liquid crystal molecules, which is generated when the surface protective film is peeled off and removed.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a surface protection film for an optical film, which can be used even for an optical film having irregularities on the surface, causes very little contamination to an adherend, does not change with time in staining to the adherend, and can suppress a peeling static voltage at the time of peeling the surface protection film to a low peeling static voltage even when a component member of a polarizing plate (a TAC film is changed to an acrylic film, a polyester film, or an aqueous pressure-sensitive adhesive is changed to an ultraviolet-curable pressure-sensitive adhesive), and an optical member using the surface protection film.
The present inventors have conducted earnest studies to solve the above-mentioned problems.
First, in order to reduce contamination to an adherend and to reduce the change with time in the staining property, it is necessary to reduce the amount of an antistatic agent to be added which is supposed to contaminate the adherend. However, when the amount of the antistatic agent added is reduced, the peeling electrostatic voltage at the time of peeling the surface protective film from the adherend increases. Then, the present inventors have studied a method for suppressing the peeling electrostatic voltage at the time of peeling the surface protective film from the adherend to a low peeling electrostatic voltage without increasing the amount of the antistatic agent added.
As a result of investigations on the above, the inventors of the present invention have found that an antistatic agent is added to an adhesive composition to such an extent that the adhesive composition does not stain an adherend, the adhesive composition is applied to one surface of a substrate, the adhesive layer is dried, and then an appropriate amount of the antistatic agent is applied to the surface of the adhesive layer. Thus, the present inventors have found that the peeling static voltage at the time of peeling the surface protective film from the optical film as an adherend can be suppressed to a low peeling static voltage and the adherend is less likely to be contaminated, and have completed the present invention.
Means for solving the problems
The technical idea of the surface protective film of the present invention is to suppress the peeling static voltage at the time of peeling from the optical film as an adherend to a low peeling static voltage while suppressing the staining property to the adherend to a low staining property by applying and drying an adhesive composition containing an antistatic agent to such an extent that the adherend is not stained, laminating an adhesive layer, and then imparting an appropriate amount of the antistatic agent to the surface of the adhesive layer.
In order to solve the above-described problems, the present invention provides a surface protection film, comprising a base film made of a transparent resin, and an adhesive layer formed on one surface of the base film, wherein the adhesive layer contains an ionic compound as an antistatic agent, a release film having a release agent layer is bonded to the adhesive layer via the release agent layer, the release agent layer contains an alkali metal salt and a silicone-based release agent, the alkali metal salt is transferred from the release film to the surface of the adhesive layer, and the electrostatic pressure for peeling the adhesive layer from an adherend is reduced.
Furthermore, it is preferred that the ionic compound is not an alkali metal salt.
Further, the adhesive layer is preferably formed by crosslinking a (meth) acrylate copolymer.
Also provided is a surface protective film having a surface potential (surface potential) of +0.7kV to-0.7 kV when peeled from an optical film as an adherend.
Further, it is preferable that the peeling force when the peeling film is peeled from the adhesive layer is 0.005 to 0.3N/50 mm.
The present invention also provides an optical member to which the surface protective film is bonded.
Effects of the invention
The surface protective film of the present invention is a surface protective film for an optical film, and can be used even for an optical film having irregularities on the surface. The surface protective film of the present invention is a surface protective film which causes very little contamination of an adherend and does not change its staining property with time. Further, the present invention can provide a surface protective film which can suppress the peeling static voltage at the time of peeling the surface protective film to a low peeling static voltage even when the constituent members of the polarizing plate are changed (from a TAC film to an acrylic film, a cyclic polyolefin film, or a polyester film, and from an aqueous adhesive to an ultraviolet-curable adhesive), and an optical member using the same.
According to the surface protective film of the present invention, the amount of static electricity generated when peeling from an adherend can be reduced, and the change with time of the peeling antistatic performance and the contamination to the adherend are small, so that the improvement of productivity and the improvement of yield can be expected.
Drawings
FIG. 1 is a schematic cross-sectional view of a surface protective film of the present invention;
FIG. 2 is a sectional view showing a state where a release film is peeled off from the surface protective film of the invention;
fig. 3 is a cross-sectional view showing an embodiment of bonding the surface protective film of the present invention to an optical member.
Description of the reference numerals
Detailed Description
The present invention will be described in detail below with reference to embodiments.
Fig. 1 is a schematic cross-sectional view of a surface protective film of the present invention. The surface protection film 10 has an adhesive layer 2 containing an antistatic agent formed on one surface of a transparent base film 1. A release film 5 is bonded to the surface of the adhesive layer 2, and the release film 5 has a release agent layer 4 containing an antistatic agent 7 formed on the surface of the resin film 3.
As the base film 1 used for the surface protection film 10 of the present invention, a base film made of a transparent and flexible resin is used. In this way, the optical member can be subjected to appearance inspection in a state where the surface protective film is bonded to the optical member as an adherend. As the film made of a transparent resin used as the base film 1, a polyester film such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, or polybutylene terephthalate is suitably used. In addition to the polyester film, a film made of another resin may be used as long as it has a desired strength and optical characteristics (optical characteristics). The substrate film 1 may be a non-stretched film or a uniaxially or biaxially stretched film. Further, the stretch ratio of the stretched film (drawn film) and the orientation angle in the axial direction formed by crystallization of the stretched film 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, and is preferably about 12 to 100 μm, and more preferably about 20 to 75 μm, because handling is facilitated.
Further, as necessary, an antifouling layer for preventing surface fouling, an antistatic layer, a hard coat layer for preventing scratches, and the like may be provided on the opposite side surface of the base material film 1 from the surface on which the adhesive layer 2 is formed. Further, an easy adhesion treatment such as surface modification by corona discharge, coating with an anchor coating agent, or the like may be applied to the surface of the base material film 1.
The pressure-sensitive adhesive layer 2 used in the surface protective film 10 of the present invention is not particularly limited as long as it can be easily peeled off after use while adhering to the surface of an adherend and hardly contaminates the adherend, and a pressure-sensitive adhesive obtained by crosslinking a (meth) acrylate copolymer is generally used in consideration of durability after adhering to an optical film.
Examples of the (meth) acrylate copolymer include copolymers obtained by copolymerizing a main monomer such as N-butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, or isononyl acrylate with a comonomer such as acrylonitrile, vinyl acetate, methyl methacrylate, or ethyl acrylate, and a functional monomer such as acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate, glycidyl methacrylate, or N-methylol methacrylamide. The (meth) acrylate copolymer may contain (meth) acrylate as both the main monomer and other monomers, and may contain 1 or 2 or more monomers other than (meth) acrylate as monomers other than the main monomer.
In addition, in the (meth) acrylate copolymer, a polyoxyalkylene group-containing compound may be copolymerized, or may be mixed. Examples of the copolymerizable polyoxyalkylene group-containing compound include 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, and methoxypolypropylene glycol (400) methacrylate. By copolymerizing these polyoxyalkylene group-containing monomers with the main monomer and the functional monomer of the (meth) acrylate copolymer, a binder formed of a polyoxyalkylene group-containing copolymer can be obtained.
The polyoxyalkylene group-containing compound to be mixed in the (meth) acrylate copolymer is preferably a polyoxyalkylene group-containing (meth) acrylate copolymer, and more preferably a polymer of a polyoxyalkylene group-containing (meth) acrylic monomer, and examples thereof include polymers of 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, methoxypolypropylene glycol (400) methacrylate, and the like. By mixing these polyoxyalkylene group-containing compounds with the (meth) acrylate copolymer, a binder to which a polyoxyalkylene group-containing compound is added can be obtained.
As the curing agent added to the pressure-sensitive adhesive layer 2, examples of the crosslinking agent for crosslinking the (meth) acrylate copolymer include isocyanate compounds, epoxy compounds, melamine compounds, metal chelates, and the like. Examples of the tackifier include rosins, coumarone indenes, terpenes, petroleum and phenols.
The adhesive layer 2 contains an antistatic agent. Examples of the antistatic agent contained in the binder layer 2 include surfactants, ionic liquids, alkali metal salts, metal oxides, metal fine particles, conductive polymers, carbon nanotubes, and the like, and ionic compounds other than alkali metal salts are preferable from the viewpoint of transparency, affinity for (meth) acrylic polymers, staining of adherends, and the like, and ionic compounds that are solid at a temperature of 25 ℃ are particularly preferable.
In addition, various resins may be added to the antistatic agent of the adhesive layer 2. Examples of the resin to be added to the antistatic agent include polyester resins, polyamide resins, polyurethane resins, polyolefin resins, polyvinyl butyral resins, polyvinyl alcohol resins, polyvinyl acetate resins, cellulose resins, silicone resins, and fluorine resins.
The antistatic agent contained in the adhesive layer 2 does not need to be concentrated on the surface of the adhesive layer 2, and can be uniformly dissolved or dispersed in the adhesive layer 2.
The ionic compound is composed of an anion and a cation, and includes an ionic liquid which is liquid at normal temperature and an ionic solid which is solid at normal temperature. Examples of the cationic moiety include cyclic amidine ions such as imidazolium ions, pyridinium ions, and ammonium ionsOrganic cations or inorganic cations such as sulfonium ions, phosphonium ions, etc. Further, as the anion moiety, C may be mentionednH2n+1COO-、CnF2n+1COO-、NO3 -、CnF2n+1SO3 -、(CnF2n+1SO2)2N-、(CnF2n+1SO2)3C-、PO4 3-、AlCl4 -、Al2Cl7 -、ClO4 -、BF4 -、PF6 -、AsF6 -、SbF6 -And the like, organic anions or inorganic anions.
The thickness of the antistatic agent-containing adhesive layer 2 used in the surface protective film 10 of the present invention is not particularly limited, but is preferably about 5 to 40 μm, and more preferably about 10 to 30 μm. Since the surface protective film is excellent in workability when peeled off from an adherend, the pressure-sensitive adhesive layer 2 having a peel strength (adhesive force) of the surface protective film to the adherend surface of about 0.03 to 0.3N/25mm and a slight adhesive force is preferable. In addition, the peeling force of the release film 5 from the adhesive layer 2 is preferably 0.005 to 0.3N/50mm in view of excellent workability when the release film 5 is peeled off from the surface protection film 10.
Further, the release film 5 used for the surface protection film 10 of the present invention has a release agent layer 4 laminated on one surface of a resin film 3, and the release agent layer 4 contains a silicone release agent and an antistatic agent 7 which does not react with the release agent.
Examples of the resin film 3 include a polyester film, a polyamide film, a polyethylene film, a polypropylene film, and a polyimide film, and the polyester film is preferable in terms of excellent transparency and low cost. The resin film may be a non-stretched film or a uniaxially or biaxially stretched film. The stretch ratio of the stretched film and the orientation angle in the axial direction formed by crystallization of the stretched film may be controlled to specific values.
The thickness of the resin film 3 is not particularly limited, but is preferably about 12 to 100 μm, and more preferably about 20 to 50 μm, because handling is easy.
Further, if necessary, an easy adhesion treatment such as surface modification by corona discharge or coating with an anchor coating agent may be applied to the surface of the resin film 3.
Examples of the silicone-based release agent constituting the release agent layer 4 include those having polydimethylsiloxane as a main component, and known silicone-based release agents such as addition reaction type, condensation reaction type, cationic polymerization type, and radical polymerization type (radial polymerization type) can be mentioned. Commercially available products of addition reaction type silicone release agents include, for example, KS-776A, KS-847T, KS-779H, KS-837, KS-778, KS-830 (manufactured by shin-Etsu chemical Co., Ltd.), SRX-211, SRX-345, SRX-357, SD7333, SD7220, SD7223, LTC-300B, LTC-350G, LTC-310 (manufactured by Dow Corning Toray Co., Ltd.). Examples of products commercially available as the condensation reaction type include SRX-290 and SYLOFF-23 (manufactured by Dow Corning Toray Co., Ltd.). Examples of products commercially available as cationic polymerization include TPR-6501, TPR-6500, UV9300, VU9315, UV9430 (manufactured by Momentive Performance Materials Co., Ltd.), and X62-7622 (manufactured by shin-Etsu chemical Co., Ltd.). Examples of commercially available products of the radical polymerization type include X62-7205 (manufactured by shin-Etsu chemical Co., Ltd.).
The antistatic agent constituting the release agent layer 4 is preferably excellent in dispersibility in a release agent solution containing dimethylpolysiloxane as a main component and does not inhibit curing of the release agent containing dimethylpolysiloxane as a main component. In addition, in order to transfer from the release agent layer 4 to the surface of the adhesive layer 2 and to impart an antistatic effect to the adhesive layer, an antistatic agent which does not react with a release agent containing dimethylpolysiloxane as a main component is preferable. As such an antistatic agent, an alkali metal salt is suitable.
Examples of the alkali metal salt include metal salts of lithium, sodium, and potassium. Specifically, for example, Li can be suitably used+、Na+、K+Cation of composition with Cl-、Br-、I-、BF4 -、PF6 -、SCN-、ClO4 -、CF3SO3 -、(CF3SO2)2N-、(C2F5SO2)2N-、(CF3SO2)3C-A metal salt consisting of a constituent anion. Among them, LiBr, LiI and LiBF are particularly preferably used4、LiPF6、LiSCN、LiClO4、LiCF3SO3、Li(CF3SO2)2N、Li(C2F5SO2)2N、Li(CF3SO2)3C, lithium salts. These alkali metal salts may be used alone, or 2 or more of them may be used in combination. For stabilization of the ionic substance, a compound having a polyoxyalkylene structure may be added.
The amount of the antistatic agent to be added to the release agent containing dimethylpolysiloxane as a main component varies depending on the kind of the antistatic agent and the degree of affinity with the release agent, and may be set in consideration of a desired electrostatic pressure for releasing the surface protective film from the adherend, staining properties to the adherend, adhesion properties, and the like.
The release agent layer 4 may be a release agent layer 4 composed of a mixture of a release agent containing dimethylpolysiloxane as a main component and an antistatic agent that does not react with the release agent. The method of mixing the release agent containing dimethylpolysiloxane as a main component with the antistatic agent is not particularly limited. Any of the following methods may be used: a method in which an antistatic agent is added to a release agent mainly composed of dimethylpolysiloxane, and a curing catalyst is mixed after mixing; a method in which a release agent mainly composed of dimethylpolysiloxane is diluted with an organic solvent in advance, and then an antistatic agent and a release agent curing catalyst are added and mixed; a method of diluting a release agent containing dimethylpolysiloxane as a main component in an organic solvent in advance, adding a mixed catalyst, and then adding and mixing an antistatic agent. Further, if necessary, an adhesion promoter such as a silane coupling agent, a material for assisting the antistatic effect such as a polyoxyalkylene group-containing compound, or the like may be added.
The mixing ratio of the release agent containing dimethylpolysiloxane as a main component and the antistatic agent is not particularly limited, and the antistatic agent is preferably contained in an amount of about 5 to 100 parts by weight in terms of solid content per 100 parts by weight of the solid content of the release agent containing dimethylpolysiloxane as a main component. If the amount of the antistatic agent added is less than 5 parts by weight in terms of solid content relative to 100 parts by weight of the solid content of the release agent containing dimethylpolysiloxane as a main component, the amount of transfer of the antistatic agent to the surface of the adhesive layer is reduced, and it is difficult to exert an antistatic function in the adhesive. Further, if the amount of the antistatic agent added in terms of solid content exceeds 100 parts by weight relative to 100 parts by weight of the solid content of the release agent containing dimethylpolysiloxane as a main component, the antistatic agent and the release agent containing dimethylpolysiloxane as a main component are transferred to the surface of the adhesive layer at the same time, and thus the adhesive properties of the adhesive may be degraded.
The method of forming the antistatic agent-containing pressure-sensitive adhesive layer 2 on the base film 1 of the surface protective film 10 of the present invention and the method of bonding the release film 5 can be carried out by known methods, and are not particularly limited. Specifically, the following methods may be mentioned: (1) a method in which a resin composition for forming an antistatic agent-containing pressure-sensitive adhesive layer 2 is applied and dried on one surface of a base film 1 to form a pressure-sensitive adhesive layer, and then a release film 5 is attached; (2) a method in which a resin composition for forming the antistatic agent-containing pressure-sensitive adhesive layer 2 is applied and dried to the surface of the release film 5 to form a pressure-sensitive adhesive layer, and then the base film 1 is attached; any of the above methods may be used.
The formation of the antistatic agent-containing pressure-sensitive adhesive layer 2 on the surface of the base film 1 can be carried out by a known method. Specifically, known Coating methods such as a reverse Coating method, Comma Coating (Comma Coating), gravure Coating (gravure Coating), slot die Coating (slot die Coating), meyer rod Coating, and air knife Coating can be used.
The release agent layer 4 can be formed on the resin film 3 by a known method. Specifically, known coating methods such as a gravure coating method, a meyer bar coating method, and an air knife coating method can be used.
The surface potential of the surface protective film 10 of the present invention having the above-described configuration when peeled from the optical film as an adherend is preferably +0.7kV to-0.7 kV. Further, the surface potential is more preferably +0.5kV to-0.5 kV, and particularly preferably +0.1kV to-0.1 kV. The surface potential can be adjusted by increasing or decreasing the kind, amount, and the like of the antistatic agent contained in the adhesive layer 2 and the antistatic agent 7 contained in the release agent layer 4. The type and amount of the antistatic agent in the adhesive layer 2 and the antistatic agent 7 in the release agent layer 4 may be adjusted in consideration of the surface contamination property of the optical film as an adherend after the surface protection film 10 is released from the optical film as an adherend.
Fig. 2 is a sectional view showing a state where a release film is peeled off from the surface protective film of the present invention.
By peeling the release film 5 from the surface protection film 10 shown in fig. 1, a part of the antistatic agent (reference numeral 7) contained in the release agent layer 4 of the release film 5 is transferred to (adhered to) the surface of the adhesive layer 2 of the surface protection film 10. Therefore, in fig. 2, the antistatic agent adhering to the surface of the adhesive layer 2 of the surface protective film is schematically indicated by a spot (circle) indicated by reference numeral 7. The antistatic agent 7 is transferred from the release film 5 to the surface of the pressure-sensitive adhesive layer 2, whereby the electrostatic peeling voltage at the time of peeling the pressure-sensitive adhesive layer 2 from the adherend is reduced as compared with the pressure-sensitive adhesive layer 2 before transfer. The peeling static voltage at the time of peeling the adhesive layer from the adherend can be measured by a known method. For example, after a surface protective film is bonded to an adherend such as a polarizing plate, the surface protective film is peeled off at a peeling speed of 40m per minute using a high speed peeling Tester (manufactured by Tester industries), and the surface potential of the adherend surface is measured once every 10ms using a surface potentiometer (manufactured by Keyence corporation), and the maximum value of the absolute value of the surface potential at this time is set as a peeling electrostatic voltage (kV).
In the surface protective film of the present invention, when the surface protective film 11 shown in fig. 2 with the release film removed is bonded to an adherend, the antistatic agent transferred to the surface of the pressure-sensitive adhesive layer 2 is in contact with the surface of the adherend. This can suppress the peeling static voltage at the time of peeling off the surface protective film from the adherend to a low peeling static voltage again.
Fig. 3 is a cross-sectional view showing an example in which the surface protective film of the present invention is bonded to an optical member.
The surface protection film 10 of the present invention is bonded to the optical member 8 as an adherend via the adhesive layer 2 in a state where the release film 5 is peeled off and the adhesive layer 2 is exposed (surface protection film 11 of fig. 2).
That is, fig. 3 shows the optical member 20 to which the surface protective film 11 is bonded, and the surface protective film 11 is in a state where the release film 5 is removed from the surface protective film 10 of the present invention. Examples of the optical member include optical films such as a polarizing plate, a retardation plate, a lens film, a polarizing plate serving as a retardation plate, and a polarizing plate serving as a lens film. Such optical members are used as components of liquid crystal display devices such as liquid crystal display panels, optical devices for various measuring instruments, and the like. Further, as the optical member, there may be mentioned optical films such as an antireflection film, a hard coat film, and a transparent conductive film for a touch panel.
When the surface protection film 11 in a state where the release film 5 is peeled off from the antistatic surface protection film 10 of the present invention is peeled off and removed from an optical member (optical film) as an adherend, the peeling electrostatic voltage can be sufficiently suppressed. Therefore, there is no possibility of breaking down circuit elements such as a driver IC, a TFT element, and a gate line driver circuit, and the production efficiency in the process of manufacturing the liquid crystal display panel can be improved, thereby ensuring the reliability of the production process.
Examples
Next, the present invention will be further described with reference to examples.
(example 1)
(preparation of surface protective film)
A coating material for forming the release agent layer of example 1 was prepared by blending 5 parts by weight of addition reaction type silicone (trade name: SRX-345, manufactured by Dow Corning Toray Co., Ltd.), 0.75 part by weight of Lithium bis (fluorosulfonyl) imide), 95 parts by weight of a 1:1 mixed solvent of toluene and ethyl acetate, and 0.05 part by weight of a platinum catalyst (trade name: SRX-212, manufactured by Dow Corning Toray Co., Ltd.) and mixing them with stirring. The coating material for forming the release agent layer of example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm using a Meyer rod so that the thickness after drying was 0.2 μm, and dried for 1 minute using a hot air circulation type oven at 120 ℃ to obtain the release film of example 1.
On the other hand, the adhesive of example 1 was prepared by mixing a binder composed of a copolymer of 80 parts by weight of 2-ethylhexyl acrylate, 17 parts by weight of methoxypolyethylene glycol (400) methacrylate and 3 parts by weight of 2-hydroxyethyl acrylate, and 0.2 part by weight of 1-nonylphenylium hexafluorophosphate (1-nonyl pyridinium hexafluorophosphate) and 2 parts by weight of an isocyanate curing agent (CORONATE (registered trademark) HX manufactured by tokyo co., ltd.) with stirring per 100 parts by weight of a 40% ethyl acetate solution of the binder.
The prepared adhesive 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 dried in a hot air circulation oven at 100 ℃ for 2 minutes to form an adhesive layer. Then, the release agent layer (silicone-treated surface) of the release film of example 1 prepared above was bonded to the surface of the adhesive layer. The obtained adhesive film was kept at 40 ℃ for 5 days to cure the adhesive, thereby obtaining the surface protective film of example 1.
(example 2)
A surface protective film of example 2 was obtained in the same manner as in example 1, except that the thickness of the coating material forming the release agent layer of example 1 after drying was set to 0.1 μm.
(example 3)
Except that the addition reaction type silicone of example 1 was prepared as follows, trade name, manufactured by Dow Corning Toray: SRX-211 a surface protective film of example 3 was obtained in the same manner as in example 1 except that lithium bistrifluoromethanesulfonylimide was used instead of lithium bistrifluoromethanesulfonylimide.
Comparative example 1
A coating material for forming the release agent layer of comparative example 1 was prepared by blending 5 parts by weight of addition reaction type silicone (trade name: SRX-345, manufactured by Dow Corning Toray Co., Ltd.), 95 parts by weight of a 1:1 mixed solvent of toluene and ethyl acetate, and 0.05 part by weight of a platinum catalyst (trade name: SRX-212, manufactured by Dow Corning Toray Co., Ltd.) and mixing them with stirring. The coating material forming the release agent layer of comparative example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm using a Meyer rod so that the thickness after drying was 0.2 μm, and dried in a hot air circulation type oven at 120 ℃ for 1 minute, to obtain the release film of comparative example 1.
On the other hand, the adhesive of example 1 was coated on the surface of a polyethylene terephthalate film having a thickness of 38 μm so that the thickness after drying was 20 μm, and then dried for 2 minutes using a hot air circulation type oven at 100 ℃. Then, the release agent layer (silicone-treated surface) of the release film of comparative example 1 prepared above was bonded to the surface of this adhesive layer. The obtained adhesive film was kept at 40 ℃ for 5 days to cure the adhesive, thereby obtaining a surface protective film of comparative example 1.
Comparative example 2
A surface protective film of comparative example 2 was obtained in the same manner as in example 1, except that 1-nonylphenylium hexafluorophosphate was not added to the binder.
Comparative example 3
A surface protective film of comparative example 3 was obtained in the same manner as in example 1, except that lithium bis (fluorosulfonylimide) was used in place of 1-nonylphenylium hexafluorophosphate of example 1.
The method and results of the evaluation test are shown below.
Method for measuring peeling force of peeling film
A sample of the surface protective film was cut into a width of 50mm and a length of 150 mm. The strength of the release film when peeled off was measured in a direction of 180 ℃ at a peeling rate of 300 mm/min in a test environment of 23 ℃ x 50% RH with a tensile tester, and this was taken as the peeling force (N/50mm) of the release film.
(surface resistivity of antistatic agent layer)
After the release film was peeled from the sample of the antistatic surface protective film, the surface resistivity (Ω/□) of the antistatic agent layer was measured using a high-performance high-resistivity meter (Hiresta (registered trademark) -UP, manufactured by mitsubishi chemical Analytech) under conditions of an applied voltage of 100V and a measurement time of 30 seconds.
Method for measuring adhesive force of surface protective film
An anti-glare and low-reflection-treated polarizing plate (AG-LR polarizing plate) in which an acrylic film was bonded to a polarizer (polyvinyl alcohol film containing iodine) using an ultraviolet-curable pressure-sensitive adhesive was used as an adherend. The polarizing plate was bonded to the surface of the glass plate by a bonding machine. Then, a surface protective film cut to a width of 25mm was attached to the acrylic film on the surface of the polarizing plate, and then stored in a test environment at 23 ℃ x 50% RH for 1 day. Then, the strength at the time of peeling the surface protective film was measured in a 180 ° direction at a peeling speed of 300 mm/min using a tensile tester, and this was taken as the adhesive force (N/25 mm).
Method for measuring electrostatic voltage for peeling surface protective film
An anti-glare and low-reflection-treated polarizing plate (AG-LR polarizing plate) in which an acrylic film was bonded to a polarizer (polyvinyl alcohol film containing iodine) using an ultraviolet-curable pressure-sensitive adhesive was used as an adherend. The polarizing plate was bonded to the surface of the glass plate by a bonding machine. Then, a surface protective film cut to a width of 25mm was attached to the acrylic film on the surface of the polarizing plate, and then stored for 1 day in a test environment of 23 ℃ x 50% RH. Then, the surface protective film was peeled off at a peeling rate of 40m per minute using a high speed peeling Tester (manufactured by Tester industries), and the surface potential of the surface of the polarizing plate was measured once every 10ms using a surface potential meter (manufactured by Keyence corporation), and the maximum value of the absolute value of the surface potential at this time was defined as a peeling electrostatic voltage (kV).
Method for confirming surface contamination of surface protective film
An anti-glare low-reflection polarizing plate (AG-LR polarizing plate) in which an acrylic film was laminated on a polarizer (polyvinyl alcohol film containing iodine) using an ultraviolet-curable adhesive was used as an adherend. The polarizing plate was bonded to the surface of the glass plate by a bonding machine. Then, a surface protective film cut to a width of 25mm was attached to the acrylic film on the surface of the polarizing plate, and then stored in a test environment at 23 ℃ x 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 property. As a criterion for determining the surface contamination property, a case where no contamination transfer was observed on the polarizing plate was indicated by "", and a case where contamination transfer was observed on the polarizing plate was indicated by "×".
The measurement results of the surface protective films of examples 1 to 3 and comparative examples 1 to 3 thus obtained are shown in Table 1. "2 EHA" means 2-ethylhexyl acrylate, "HEA" means 2-hydroxyethyl acrylate, "# 400G" means methoxypolyethylene glycol (400) methacrylate, "AS agent (1)" means lithium bis (fluorosulfonylimide), "AS agent (2)" means lithium bis (trifluoromethanesulfonylimide), "AS agent (3)" means 1-nonylphenylium hexafluorophosphate, "SRX-345" means SRX-345, "SRX-211" means SRX-211, "and" SRX212 "means platinum catalyst SRX-212. Further, "1.5E 10" in surface resistivity means 1.5X 1010。
[ Table 1]
From the measurement results shown in table 1, it is understood that:
the surface protective films of examples 1 to 3 of the present invention had a moderate adhesive force and no contamination on the surface of the adherend. Further, even if the adherend is a polarizing plate using an acrylic film, the peeling electrostatic voltage when peeling the surface protective film from the adherend is low.
On the other hand, the surface protective film of comparative example 1 in which no antistatic agent was added to the release agent layer and the surface protective film of comparative example 2 in which no antistatic agent was added to the adhesive layer had higher release electrostatic pressure when the surface protective film was released from the adherend. In addition, the surface protective film of comparative example 3, in which the same kind of antistatic agent was used for the adhesive layer and the release agent layer, was good in that the peeling static voltage at the time of peeling the surface protective film from the adherend was low, but the contamination of the adherend after peeling was increased.
That is, the surface protective films of comparative examples 1 to 3 hardly achieve both reduction in peeling static voltage and low staining property to an adherend. On the other hand, the surface protective films of examples 1 to 3 in which different types of antistatic agents were added to the adhesive layer and the release agent layer had high effect of reducing the release electrostatic voltage, and no contamination of the adherend and a good surface protective film could be obtained.
Industrial applicability
The surface protective film of the present invention can be used for bonding to optical members such as polarizing plates, retardation plates, lens films, antireflection films, hard coat films, and transparent conductive films, and for protecting surfaces in production processes of other various optical members. Further, the surface protective film of the present invention has a low amount of static electricity generated when peeled from an adherend, and is less likely to cause a change with time in the peeling antistatic property and contamination of the adherend, and can improve the yield of the production process, and has a high industrial utility value.
Claims (5)
1. A surface protection film, characterized in that an adhesive layer is formed on one surface of a base material film composed of a transparent resin, the adhesive layer contains an ionic compound as an antistatic agent, the ionic compound is solid at a temperature of 25 ℃ and is not an alkali metal salt, a stripping film with a stripping agent layer is bonded on the adhesive layer through the stripping agent layer, the stripping agent layer contains an alkali metal salt and a silicone stripping agent, the components of the alkali metal salt are transferred to the surface of the adhesive layer from the stripping film, the stripping electrostatic pressure is reduced when the adhesive layer is stripped from an adherend, and the adherend is a polarizing plate using an acrylic film, a polarizing plate using a cyclic polyolefin film, a polarizing plate using a polyester film, or a polarizing plate using an ultraviolet curing adhesive.
2. The surface protective film according to claim 1, wherein the adhesive layer is formed by crosslinking a (meth) acrylate copolymer.
3. The surface protective film according to claim 1 or 2, wherein the surface potential at the time of peeling from the optical film as an adherend is +0.7kV to-0.7 kV.
4. The surface protective film according to claim 1 or 2, wherein a peeling force when peeling the release film from the adhesive layer is 0.005 to 0.3N/50 mm.
5. An optical member having the surface protective film according to any one of claims 1 to 4 bonded thereto.
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