CN107083198B - Surface protection film and optical component bonded with same - Google Patents

Surface protection film and optical component bonded with same Download PDF

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Publication number
CN107083198B
CN107083198B CN201610888772.2A CN201610888772A CN107083198B CN 107083198 B CN107083198 B CN 107083198B CN 201610888772 A CN201610888772 A CN 201610888772A CN 107083198 B CN107083198 B CN 107083198B
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film
release
surface protective
protective film
release agent
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CN107083198A (en
Inventor
小林弘幸
春日充
新见洋人
铃木千惠
五十岚智美
木俣绘美子
林益史
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Fujimori Kogyo Co Ltd
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Fujimori Kogyo Co Ltd
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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/24—Electrically-conducting paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • 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]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • 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
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/401—Adhesives in the form of films or foils characterised by release liners characterised by the release coating composition
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/017—Additives being an antistatic agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
    • C08K5/3432—Six-membered rings
    • 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
    • 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
    • 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
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate

Abstract

The invention provides a surface protective film which can be used for an optical film with concave-convex surface, has less pollution to an adherend, has low pollution performance to the adherend, does not change with time, and has excellent anti-stripping electrostatic performance without time deterioration, and an optical component using the surface protective film. A surface protection film (10) is formed by adhering a release film (5) with a release agent layer (4) on an adhesive agent layer (2), wherein the release film (5) is formed by laminating the release agent layer (4) on one surface of a resin film (3), the release agent layer (4) contains a release agent with polydimethylsiloxane as a main component, an antistatic agent which is not reacted with the release agent, and an ester plasticizer containing at least one ether bond, the antistatic agent component is an ionic compound with a melting point of 30-80 ℃, the antistatic agent component and the ester plasticizer are transferred from the release agent layer (4) of the release film (5) to the surface of the adhesive agent layer (2), and the electrostatic release pressure when the adhesive agent layer (2) is released from an adherend is reduced.

Description

Surface protection film and optical component bonded with same
Technical Field
The present invention relates to a surface protective film to be bonded to a surface of an optical member (hereinafter, also referred to as an optical film) such as a polarizing plate, a retardation plate, or a lens film for a display. More specifically, the present invention provides a surface protective film which causes little contamination to an adherend, and further provides a surface protective film having excellent antistatic property without deterioration with time, and an optical member using the surface protective film.
Background
Conventionally, in the production and transportation of optical products such as polarizing plates, retardation plates, lens films for displays, antireflection films, hard coat films, and transparent conductive films for touch panels, and displays using these films, a surface protective film is bonded to the surface of the optical film to prevent the surface from being stained or scratched in a subsequent step. In the visual inspection of an optical film as an optical product, in order to save labor for peeling and re-attaching a surface protective film and to improve work efficiency, the surface protective film may be directly attached to the optical film.
In general, in the production process of optical products, a surface protective film having an adhesive layer provided on one surface of a base film is used in order to prevent scratches and dirt from adhering thereto. The surface protective film is bonded to the optical film via a micro-adhesive layer. The reason why the adhesive layer has a slight adhesive force is that when the used surface protective film is peeled off and removed from the surface of the optical film, the adhesive can be easily peeled off, and the adhesive is not left attached to the optical film of the product to be adhered (that is, the generation of adhesive residue is prevented).
In recent years, in the production process of a liquid crystal display panel, although the number of products is small, a peeling electrostatic voltage generated when a surface protective film bonded to an optical film is peeled off and removed is generated, and thus, a phenomenon occurs in which a circuit member such as a driver IC for controlling a display screen of the liquid crystal display panel is broken or 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 reduced, and accordingly, the breakdown voltage of the driver IC is also reduced. Recently, it is required to set the peeling electrostatic voltage within the range of +0.7kV to-0.7 kV.
In addition, with the recent spread of 3D displays (stereoscopic displays), an fpr (film Patterned reflector) film may be bonded to the surface of an optical film such as a polarizing plate. After peeling off the surface protective film bonded to the surface of the optical film such as a polarizing plate, an FPR film is bonded. However, if the surface of an optical film such as a polarizing plate is contaminated with an adhesive or an antistatic agent used for a surface protective film, there is a problem that it is difficult to attach an FPR film. Therefore, the surface protective film used for this purpose is required to have less contamination of an adherend.
Further, in some liquid crystal panel factories, as a method for evaluating the staining property of the surface protective film to the adherend, the following method is employed: a method of peeling off the surface protective film once, bonding the surface protective film once again in a state where air bubbles are mixed, heating the surface protective film under a predetermined condition, and then peeling off the surface protective film to observe the surface of the adherend. In this evaluation method, if there is a difference in surface contamination of the adherend between a portion where air bubbles are mixed and a portion in contact with the adhesive of the surface protective film even if the surface contamination of the adherend is slight, the surface contamination of the adherend remains as a trace of air bubbles (also referred to as air bubble penetration in some cases). Therefore, this evaluation method is a very strict evaluation method as an evaluation method of staining property to the surface of an adherend. In recent years, there has been a demand for a surface protective film that does not have a problem in terms of staining properties on the surface of an adherend, even when the result of determination is made by such a strict evaluation method.
In order to prevent the occurrence of a problem due to a high peeling static voltage when peeling a surface protective film from an optical film as an adherend, a surface protective film using an adhesive layer containing an antistatic agent for suppressing the peeling static voltage at a low level has been proposed.
For example, patent document 1 discloses a surface protective film using an adhesive composed of an alkyltrimethylammonium salt, a hydroxyl group-containing acrylic polymer, and a polyisocyanate.
Patent document 2 discloses an adhesive composition comprising an ionic liquid and an acrylic polymer having an acid value of 1.0 or less, and adhesive sheets using the same.
Patent document 3 discloses an adhesive composition comprising an acrylic polymer, a polyether polyol compound, and an alkali metal salt treated with an anion-adsorptive compound, and a surface protective film using the adhesive composition.
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.
Further, patent document 5 discloses an adhesive composition for a surface protection sheet of an optical member made of a polymer containing a liquid ionic salt, and an adhesive sheet.
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
Patent document 5: japanese laid-open patent publication No. 2008-069261
Disclosure of Invention
Technical problem to be solved by the invention
In the above patent documents 1 to 5, an antistatic agent is added to the inside of the adhesive agent layer. However, the thicker the adhesive layer is, or the longer the time has elapsed after the adhesion to the adherend, the more the antistatic agent is transferred from the adhesive layer to the adherend relative to the adherend to which the surface protective film is adhered. If 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, and the adhesiveness of the FPR film may be deteriorated when the FPR film is bonded.
Another problem arises when the thickness of the adhesive layer is reduced in order to reduce such an increase over time in the antistatic agent transferred from the adhesive layer to the adherend. For example, when used for an optical film having surface irregularities such as an antiglare polarizer, the film has the following problems: since the adhesive layer is difficult to follow the unevenness of the surface of the optical film and air bubbles are mixed, the adhesive force is reduced due to a decrease in the adhesive area between the optical film and the adhesive layer, and the surface protective film floats or falls off during use.
Therefore, there is a need for a surface protective film for an optical film that can be bonded to an optical film having irregularities on the surface, causes very little contamination to an adherend, and does not increase the contamination to the adherend over time, and a surface protective film that can suppress the peeling static voltage at a low level when peeling the surface protective film from the adherend.
The inventors of the present application have conducted intensive studies in order to solve these problems.
In order to reduce contamination of an adherend and increase in contamination with time, it is necessary to reduce the amount of an antistatic agent component in an adhesive layer which is supposed to cause contamination of the adherend. However, when the amount of the antistatic agent component in the adhesive agent layer is reduced, the peeling electrostatic voltage at the time of peeling the surface protective film from the adherend is increased. Therefore, a method has been studied in which the peeling electrostatic voltage at the time of peeling the surface protective film from the adherend can be suppressed to a low level without increasing the absolute amount of the antistatic agent component in the adhesive layer.
As a result, the present inventors have found that a release static voltage at the time of releasing a surface protective film from an optical film as an adherend can be suppressed to a low level by applying an appropriate amount of an antistatic agent component only on the surface of an adhesive layer after applying and drying an adhesive composition containing an antistatic agent and laminating the adhesive composition onto a substrate film to form the adhesive layer, and have completed the present invention.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a surface protective film which can be bonded to an optical film having an uneven surface, causes little contamination to an adherend, does not change the low contamination property to the adherend with time, and has excellent antistatic property without deterioration with time, and an optical member using the surface protective film.
Means for solving the problems
In order to solve the above-described problems, the present invention is based on the idea that a surface protective film of the present invention can suppress staining to an adherend and also suppress a peeling static voltage at the time of peeling from an optical film as an adherend at a low level by applying an adhesive composition containing no antistatic agent on one surface of a base film, drying the composition, and laminating an adhesive layer, and then applying an appropriate amount of antistatic agent to the surface of the adhesive layer.
In order to solve the above-mentioned problems, the present invention provides a surface protective film comprising a base film made of a transparent resin, an adhesive layer formed on one surface of the base film, and a release film having a release agent layer bonded to the adhesive layer, the release film is characterized in that the release film is formed by laminating a release agent layer on one surface of a resin film, the release agent layer contains a release agent containing polydimethylsiloxane as a main component, an antistatic agent which does not react with the release agent, and an ester plasticizer containing at least one ether bond, the antistatic agent component is an ionic compound having a melting point of 30-80 ℃, and the antistatic agent component and the ester plasticizer are transferred from the release agent layer of the release film to the surface of the adhesive layer, thereby reducing the peeling electrostatic voltage when the adhesive layer is peeled from an adherend.
The adhesive layer is preferably obtained by crosslinking an adhesive composition containing a (meth) acrylate copolymer and a crosslinking agent.
Further, the peeling force when the release film is peeled from the adhesive layer is preferably 0.2N/50mm or less.
The present invention also provides an optical member obtained by bonding the surface protective film.
Effects of the invention
The surface protective film of the present invention causes little contamination to an adherend, and the low contamination to the adherend does not change with time. The surface protective film of the present invention can be used even for an optical film having irregularities on the surface of an adherend such as an AG polarizing plate. Further, the present invention can provide a surface protective film having excellent antistatic property without deterioration with time, which can suppress a peeling static voltage generated when peeling from an optical film as an adherend at a low level, and an optical member using the surface protective film.
According to the surface protective film of the present invention, the surface of the optical film can be reliably protected, and therefore, productivity and yield can be improved.
Drawings
FIG. 1 is a schematic view showing the concept of the surface protective film of the present invention;
FIG. 2 is a sectional view showing a state where a release film is peeled from the surface protective film of the present invention;
fig. 3 is a sectional view showing one embodiment of the optical member of the present invention.
Description of the reference numerals
1 … substrate film; 2 … an adhesive layer; 3 … resin film; 4 … a release agent layer; 5 … peeling film; 7 … antistatic agent and ester plasticizer; 8 … adherend (optical member); 10 … surface protective film; 11 … peeling off the surface protection film of the peeling film; 20 … an optical member having a surface protective film bonded thereto.
Detailed Description
The present invention will be described in detail below with reference to embodiments.
Fig. 1 is a schematic view showing the concept of the surface protective film of the present invention. The surface protection film 10 has an adhesive layer 2 formed on one surface of a transparent base film 1. A release film 5 in which a release agent layer 4 is formed on the surface of a resin film 3 is bonded to the surface of the adhesive layer 2.
As the base film 1 used in the surface protective film 10 of the present invention, a base film made of a transparent and flexible resin is used. Thus, the appearance of the optical member can be detected in a state where the surface protective film is bonded to the optical member as the adherend. As the film composed 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 preferably 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 compatibility. 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 or the orientation angle in the axial direction formed by crystallization of the stretched film may be controlled to a specific value.
The thickness of the base film 1 used in the surface protective film 10 of the present invention is not particularly limited, but is preferably about 12 to 100 μm, and more preferably about 20 to 50 μm, because handling is easier.
Further, if 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 surface of the base material film 1 opposite to the surface on which the adhesive layer 2 is formed. Further, the surface of the base film 1 may be subjected to an easy adhesion treatment such as surface modification by corona discharge or coating with an anchor agent.
The adhesive layer 2 used in the surface protective film 10 of the present invention is not particularly limited as long as it is an adhesive that can be easily peeled off after being bonded to the surface of an adherend and is less likely to stain the adherend, but an acrylic adhesive obtained by crosslinking a (meth) acrylate copolymer is generally used in consideration of durability and the like after being bonded to an optical film.
Examples of the (meth) acrylate ester 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, a functional monomer such as acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate, glycidyl methacrylate, or N-methylolmethacrylamide, or a polyoxyalkylene group-containing monomer such as methoxypolyethylene glycol methacrylate. The main monomer and other monomers of the (meth) acrylate copolymer may be both (meth) acrylates, and the copolymer may contain one or more monomers other than (meth) acrylates as monomers other than the main monomer. The other monomer other than the main monomer may be selected from, but not particularly limited to, the above-mentioned comonomers, functional monomers, polyoxyalkylene group-containing monomers, and the like.
As the curing agent added to the adhesive layer 2, a crosslinking agent for crosslinking the (meth) acrylate copolymer includes an isocyanate compound, an epoxy compound, a melamine compound, a metal chelate compound, and the like. Examples of the thickener include rosins, coumarone-indenes, terpenes, petroleum, phenols and the like.
The thickness of the adhesive agent 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. Further, since the surface protective film is excellent in workability when peeled from an adherend, the adhesive layer 2 having a slight adhesive force is preferable in which the peel strength (adhesive force) of the surface protective film to the adherend surface is about 0.03 to 0.3N/25 mm. Further, since the workability when peeling off the release film 5 from the surface protective film 10 is excellent, the peeling force when peeling off the release film 5 from the adhesive agent layer 2 is preferably 0.2N/50mm or less, more preferably 0.14N/50mm or less.
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 a resin film 3, wherein the release agent layer 4 contains a release agent mainly composed of polydimethylsiloxane, an antistatic agent which does not react with the release agent, and an ester plasticizer containing at least one ether bond. In the release film used for the surface protective film of the present invention, the antistatic agent component is preferably an ionic compound having a melting point of 30 to 80 ℃.
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 particularly preferable because of its excellent transparency and low cost. The resin film may be a non-stretched film, or may be 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 16 to 50 μm, because handling is easy.
Further, if necessary, the surface of the resin film 3 may be subjected to surface modification by corona discharge, or to an easy adhesion treatment such as application of an anchor agent.
Examples of the release agent containing polydimethylsiloxane as a main component constituting the release agent layer 4 include known silicone release agents such as an addition reaction type, a condensation reaction type, a cationic polymerization type, and a radical polymerization type. 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 commercially available condensation reaction type silicone release agents include SRX-290 and SYLOFF-23 (manufactured by Dow Corning Toray Co., Ltd.). Examples of commercially available cationic polymerization silicone-based release agents include TPR-6501, TPR-6500, UV9300, VU9315, UV9430 (manufactured by Momentive Performance Materials Company), and X62-7622 (manufactured by shin-Etsu chemical Co., Ltd.). Commercially available products of the radical polymerizable silicone-based release agent include X62-7205 (manufactured by shin-Etsu chemical Co., Ltd.).
The antistatic agent constituting the release agent layer 4 is preferably an antistatic agent which has good dispersibility in a release agent solution containing polydimethylsiloxane as a main component and does not inhibit curing of the release agent containing polydimethylsiloxane as a main component. In addition, in order to transfer from the release agent layer 4 to the surface of the adhesive agent layer 2 and to impart an antistatic effect to the adhesive agent layer 2, an antistatic agent which does not react with a release agent containing polydimethylsiloxane as a main component is preferable. An ionic compound having a melting point of 30 to 80 ℃ is very suitable as such an antistatic agent.
AsThe ionic compound having a melting point of 30 to 80 ℃ is an ionic compound having a cation and an anion, and examples thereof include an onium cation such as a pyridinium cation, an imidazolium cation, a pyrimidinium cation, a pyrazolium cation, a pyrrolidinium cation, or an ammonium cation, and an onium cation such as a phosphonium cation or a sulfonium cation, and an anion such as a hexafluorophosphate (PF)6 -) Thiocyanate (SCN)-) Alkyl benzene sulfonate (RC)6H4SO3 -) Perchlorate (ClO)4 -) Tetrafluoroborate (BF)4 -) And the like inorganic or organic anionic compounds. By selecting the chain length of the alkyl group or the position, number, etc. of the substituent, an ionic compound having a melting point of 30 to 80 ℃ can be obtained. The cation is preferably a quaternary nitrogen-containing onium cation, and examples thereof include a quaternary pyridinium cation such as a 1-alkylpyridine (the carbon atom at the 2-6-position may or may not have a substituent), a quaternary imidazolium cation such as a 1, 3-dialkylimidazole (the carbon atom at the 2-4-5-position may or may not have a substituent), and a quaternary ammonium cation such as a tetraalkylammonium.
The amount of the antistatic agent added to the release agent mainly composed of polydimethylsiloxane differs depending on the kind of the antistatic agent and the affinity with the release agent. The amount of the antistatic agent to be added can be set in consideration of a peeling static voltage expected when the surface protective film is peeled from an adherend, staining properties to the adherend, adhesion properties, and the like.
The ester plasticizer containing at least one ether bond constituting the release agent layer 4 is used to improve the antistatic performance of the surface of the adhesive agent layer 2. The plasticizer contained in the release agent layer 4 is preferably a plasticizer having good dispersibility in a release agent solution containing polydimethylsiloxane as a main component. Further, a plasticizer which does not inhibit curing of the release agent mainly composed of polydimethylsiloxane is preferable. Further, the plasticizer functions to assist transfer of the antistatic agent contained in the release agent layer 4 from the release agent layer 4 to the surface of the adhesive layer 2. Therefore, the plasticizer is preferably a substance that does not react with the release agent containing polydimethylsiloxane as a main component. As such a plasticizer, an ester plasticizer containing at least one ether bond in the molecule is suitable.
At least one ether bond present in the molecule of the ester plasticizer is required to improve the affinity with the antistatic agent. In the surface protective film of the present invention, a plasticizer is used in order to transfer the antistatic agent component from the release agent layer to the surface of the adhesive layer with high efficiency when the release agent layer is in contact with the adhesive layer. In the present invention, in order to improve the affinity between the release agent layer and the adhesive agent layer, an ester group-containing plasticizer is preferably used.
Examples of the ester plasticizer having at least one ether bond in the molecule include diethylene glycol di-2-ethylhexanoate, tetraethylene glycol di-2-ethylhexanoate, hexaethylene glycol di-2-ethylhexanoate, triethylene glycol diethylbutyrate, polyethylene glycol diethylbutyrate, polypropylene glycol diethylhexanoate, triethylene glycol dibenzoate, tetraethylene glycol dibenzoate, polyethylene glycol dibenzoate, polypropylene glycol dibenzoate, and polyethylene glycol-2-ethylhexanoate benzoate. One or a mixture of two or more of these ester plasticizers can be used. Herein, the ethylhexanoate is also referred to as ethylhexanoate (ethyl hexanoate), ethylhexanoate (ethyl hexanoate ester), and the like. Benzoate (benzoate) refers to benzoate.
The amount of the ester plasticizer added to the release agent mainly composed of polydimethylsiloxane varies depending on the kind of the plasticizer and the affinity with the release agent, but may be set in consideration of a desired electrostatic pressure for peeling the surface protective film from the adherend, staining properties to the adherend, adhesion properties, and the like.
The method of mixing the release agent mainly composed of polydimethylsiloxane, the antistatic agent and the ester plasticizer is not particularly limited. Any of the following methods may be used: a method in which an antistatic agent and an ester plasticizer are added to and mixed with a release agent containing polydimethylsiloxane as a main component, and then a release agent curing catalyst is added to and mixed with the release agent; a method of diluting a release agent mainly composed of polydimethylsiloxane with an organic solvent in advance, and then adding and mixing an antistatic agent, an ester plasticizer, and a release agent curing catalyst; a method of diluting a release agent containing polydimethylsiloxane as a main component in an organic solvent in advance, adding and mixing a catalyst, and then adding and mixing an antistatic agent and an ester plasticizer. Further, if necessary, a material for assisting the antistatic effect, such as a sticking property improving agent such as a silane coupling agent or a polyoxyalkylene group-containing compound, may be added.
The mixing ratio of the release agent containing polydimethylsiloxane as a main component, the antistatic agent and the ester plasticizer is not particularly limited, but the total of the antistatic agent and the ester plasticizer is preferably about 5 to 100 parts by solid content relative to 100 parts by solid content of the release agent containing polydimethylsiloxane as a main component. If the total amount of the antistatic agent and the ester plasticizer is less than 5 parts in terms of the amount of the solid content relative to 100 parts of the solid content of the release agent mainly composed of polydimethylsiloxane, the transfer amount of the antistatic agent and the ester plasticizer to the surface of the adhesive layer decreases, and it becomes difficult to exhibit the antistatic function imparted to the adhesive. Further, if the total amount of the antistatic agent and the ester plasticizer is more than 100 parts in terms of the amount of the solid content relative to 100 parts of the solid content of the release agent mainly composed of polydimethylsiloxane, the antistatic agent and the ester plasticizer are transferred to the surface of the adhesive layer at the same time as the release agent mainly composed of polydimethylsiloxane, and thus the adhesive property of the adhesive may be lowered.
The method of forming the 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 performed by known methods, and are not particularly limited. Specifically, the following methods can be exemplified: (1) a method in which a resin composition for forming the adhesive layer 2 is applied to one surface of the base film 1, dried to form an adhesive layer, and then the release film 5 is bonded thereto; (2) any method may be used, for example, a method in which the resin composition for forming the adhesive layer 2 is applied to the surface of the release film 5 and dried to form an adhesive layer, and then the base film 1 is bonded thereto.
In addition, a known method can be used to form the adhesive layer 2 on the surface of the base film 1. Specifically, known coating methods such as reverse coating, knife coating, gravure coating, nip extrusion coating, meyer rod coating, and air knife coating can be used.
Similarly, the release agent layer 4 may be formed on the resin film 3 by a known method. Specifically, known coating methods such as gravure coating, meyer bar coating, and air knife coating can be used.
The surface protective film 10 of the present invention having the above-described structure preferably has a surface potential of +0.7kV to-0.7 kV when the adhesive layer is peeled from the optical film as an adherend. 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 adjusting the type, amount, and the like of the antistatic agent and the ester plasticizer contained in the release agent layer.
Fig. 2 is a sectional view showing a state where a release film is peeled 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 and the ester plasticizer (reference numeral 7) contained in the release agent layer 4 of the release film 5 is transferred (adhered) to the surface of the adhesive agent layer 2 of the surface protection film 10. Therefore, in fig. 2, the antistatic agent and the ester plasticizer transferred to the surface of the adhesive layer 2 of the surface protection film 11 in the state where the release film is peeled off are illustrated by the dots of reference numeral 7. By transferring the antistatic agent and the component 7 of the ester plasticizer from the release film 5 to the surface of the adhesive layer 2, the peeling electrostatic voltage at the time of peeling the adhesive layer 2 from an adherend is reduced as compared with the adhesive layer 2 before transfer. The electrostatic pressure for 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 peel TESTER (manufactured by ltd.), the surface potential of the adherend surface is measured at 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 defined as the peeling static voltage (kV).
In the surface protective film of the present invention, when the surface protective film 11 in the state shown in fig. 2 in which the release film is peeled off is attached to an adherend, the antistatic agent and the ester plasticizer transferred to the surface of the adhesive layer 2 are in contact with the surface of the adherend. This can suppress the peeling static voltage at the time of peeling the surface protective film from the adherend again to a low level.
Fig. 3 is a sectional view showing an embodiment of the optical member of the present invention.
The release film 5 is peeled from the surface protective film 10 of the present invention, and is bonded to the optical member 8 as an adherend via the adhesive layer 2 in a state where the adhesive layer 2 is exposed.
That is, fig. 3 shows an optical member 20 to which the surface protective film 11 of the present invention is bonded. Examples of the optical member include optical films such as a polarizing plate, a retardation plate, a lens film, a polarizing plate which also serves as a retardation plate, and a polarizing plate which also serves as a lens film. The optical member can be used as a component of a liquid crystal display device such as a liquid crystal display panel, an optical system device for various measuring instruments, and the like. Further, optical members include optical films such as antireflection films, hard coat films, and transparent conductive films used for touch panels.
According to the optical member of the present invention, when the surface protective film 11 is peeled and removed from the optical member (optical film) as an adherend, the peeling static voltage can be sufficiently reduced. Therefore, there is no fear of damaging circuit components such as a driver IC, a TFT element, and a gate line driver circuit, and the production efficiency in the production process of a liquid crystal display panel or the like can be improved, and the reliability of the production process can be maintained.
Examples
The invention will be further illustrated with reference to the following examples.
(example 1)
(preparation of surface protective film)
5 parts by weight of addition reaction type silicone (product name: SRX-345, manufactured by Dow Corning Toray Co., Ltd.), 0.75 part by weight of N-butyl-4-methylpyridine hexafluorophosphate as an ionic compound having a melting point of 48 ℃, 0.75 part by weight of tetraethylene glycol di-2-ethylhexanoate, 95 parts by weight of a mixed solvent of toluene and ethyl acetate at 1:1, and 0.05 part by weight of a platinum catalyst (product name: SRX-212, manufactured by Dow Corning Toray Co., Ltd.) were mixed and stirred to prepare a coating material for forming the agent layer of example 1. The coating material for forming the release agent layer of example 1 was applied to the surface of the polyethylene terephthalate film having a thickness of 38 μm using a meyer rod, the thickness after drying was set to 0.2 μm, and the film was dried for 1 minute using a hot air circulation type oven at 120 ℃. On the other hand, 1.2 parts by weight of an isocyanate-based curing agent (product name: CORONATE (registered trademark) hX, manufactured by TOSOH CORPORATION) was mixed with 100 parts by weight of a 30% ethyl acetate solution of an adhesive polymer composed of a copolymer of 90 parts by weight of 2-ethylhexyl acrylate, 7 parts by weight of methoxypolyethylene glycol (400) methacrylate, and 3 parts by weight of 2-hydroxyethyl acrylate, to prepare an adhesive composition of example 1. Furthermore, CORONATE (registered trademark) HX is a curing agent for HDI-based (hexamethylene diisocyanate).
The adhesive composition of example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm so that the thickness after drying was 20 μm, and then dried for 2 minutes using a hot air circulating oven at 100 ℃. Then, the release film of example 1 prepared above was bonded to the surface of the adhesive layer via a release agent layer (silicone-treated surface). The obtained adhesive film was kept at 40 ℃ for 5 days to cure the adhesive layer, 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 1-methyl-3-ethylimidazole hexafluorophosphate, which is an ionic compound having a melting point of 62 ℃, was used instead of N-butyl-4-methylpyridine hexafluorophosphate.
Comparative example 1
5 parts by weight of addition reaction type silicone (product name: SRX-345, manufactured by Dow Corning Toray Co., Ltd.), 95 parts by weight of toluene and a mixed solvent of ethyl acetate 1:1, 0.05 part by weight of a platinum catalyst (product name: SRX-212, manufactured by Dow Corning Toray Co., Ltd.) were mixed and stirred to prepare a coating material for forming the release agent layer of comparative example 1. The coating material for forming the release agent layer of comparative example 1 was applied to the surface of the 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 oven at 120 ℃. On the other hand, 0.3 parts by weight of N-butyl-4-methylpyridine hexafluorophosphate and 1.5 parts by weight of an isocyanate-based curing agent (product name: Coronate (registered trademark) HX, manufactured by Dow Corning Toray Co., Ltd.) were mixed with 100 parts by weight of the adhesive polymer solution of example 1 (an ethyl acetate solution having a solid content of 30%) under stirring to prepare an adhesive composition of comparative example 1.
The adhesive composition of comparative example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm so that the thickness after drying was 20 μm, and then dried for 2 minutes using a hot air circulation drying oven at 100 ℃. Then, the release agent layer (silicone-treated surface) of the release film of comparative example 1 prepared above was attached to the surface of the adhesive layer. The obtained adhesive film was kept at 40 ℃ for 5 days to cure the adhesive layer, 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 comparative example 1, except that N-butyl-4-methylpyridine hexafluorophosphate was not added to the adhesive layer.
Comparative example 3
A surface protective film of comparative example 3 was obtained in the same manner as in example 1, except that tetraethylene glycol di-2-ethylhexanoate as an ester plasticizer was not added to the release agent layer.
(example 3)
A surface protective film of example 3 was obtained in the same manner as in example 1 except that an adhesive composition in which 1.2 parts by weight of an isocyanate-based curing agent (product name: Coronate (registered trademark) HX, manufactured by TOSOH CORATION) was added to and mixed with 100 parts by weight of a 30% ethyl acetate solution of an adhesive polymer composed of a copolymer of 58 parts by weight of 2-ethylhexyl acrylate, 38 parts by weight of butyl acrylate, and 4 parts by weight of 2-hydroxyethyl acrylate was used in place of the adhesive composition of example 1.
(example 4)
A surface protective film of example 4 was obtained in the same manner as in example 1 except that an adhesive composition in which 1.2 parts by weight of an isocyanate-based curing agent (product name: Coronate (registered trademark) HX, manufactured by TOSOH CORPORATION) was added to and mixed with 100 parts by weight of a 30% ethyl acetate solution of an adhesive polymer composed of a copolymer of 96 parts by weight of 2-ethylhexyl acrylate and 4 parts by weight of 2-hydroxyethyl acrylate was used in place of the adhesive composition 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 to a width of 50mm and a length of 150 mm. The strength at the time of peeling the release film was measured in a 180 ° direction at a peeling speed of 300 mm/min using a tensile tester under a test environment of 23 ℃ x 50% RH, and this was taken as the peeling force (N/50mm) of the release film.
< method for measuring adhesion of surface protective film >
An anti-glare low-reflection-treated polarizing plate (AG-LR polarizing plate) was attached to the surface of the glass plate using a double-sided adhesive tape for an attaching machine. Then, a surface protective film cut to a width of 25mm was attached to the surface of the polarizing plate, and the polarizing plate was stored in a test environment at 23 ℃ x 50% RH for one day. Then, the strength at the time of peeling the surface protective film was measured in the 180 ° direction at a peeling speed of 300 mm/min using a tensile tester, and this was taken as a peeling force (N/25 mm).
< method for measuring Electrostatic pressure for peeling surface protective film >
An anti-glare low-reflection-treated polarizing plate (AG-LR polarizing plate) was attached to the surface of the glass plate using a double-sided adhesive tape for an attaching machine. Then, a surface protective film cut to a width of 25mm was attached to the surface of the polarizing plate, and the polarizing plate was stored in a test environment at 23 ℃ x 50% RH for one day. Thereafter, the surface protective film was peeled off at a peeling speed of 40 m/min using a high speed peel TESTER (manufactured by TESTER SANGYO CO. LTD.), and the surface potential of the surface of the polarizing plate was measured every 10ms using a surface potentiometer (manufactured by KEYENCE CORPORATION), and the maximum value of the absolute value of the surface potential at that time was taken as the peeling static voltage (kV).
< method for determining surface-staining Property of surface protective film >
An anti-glare low-reflection-treated polarizing plate (AG-LR polarizing plate) was attached to the surface of the glass plate using a double-sided adhesive tape for an attaching machine. Then, a surface protective film cut to a width of 25mm was attached to the surface of the polarizing plate, and then the polarizing plate was stored in a test environment at 23 ℃ C.. times.50% RH for 3 days and 30 days. After that, the surface protective film was peeled off, and the presence or absence of contamination on the surface of the polarizing plate was visually observed. As a criterion for determining the surface contamination property, a case where no contamination transfer was observed on the polarizer was evaluated as (o), and a case where contamination transfer was observed on the polarizer was evaluated as (x).
The measurement results of the obtained surface protective films of examples 1 to 4 and comparative examples 1 to 3 are shown in tables 1 to 2. "2 EHA" is 2-ethylhexyl acrylate, "HEA" is 2-hydroxyethyl acrylate, "BA" is butyl acrylate, "# 400G" is methoxypolyethylene glycol (400) methacrylate, "AS-a" is N-butyl-4-methylpyridine hexafluorophosphate, "AS-b" is 1-methyl-3-ethylimidazole hexafluorophosphate, and "plasticizer" is tetraethylene glycol di-2-ethylhexanoate. In tables 1 and 2, the composition of the adhesive layer is represented by parts by weight so that the total amount of the adhesive polymer (solid content) is about 100 parts by weight. Therefore, in the adhesive layer of comparative example 1, the weight ratio of the adhesive polymer (solid content) to N-butyl-4-methylpyridine hexafluorophosphate was 30 parts by weight: 0.3 parts by weight to 100 parts by weight: 1.0 part by weight.
[ Table 1]
Figure BDA0001128618850000171
[ Table 2]
Figure BDA0001128618850000181
From the measurement results shown in tables 1 and 2, the following conclusions can be drawn.
The surface protective films of examples 1 to 4 of the present invention had a moderate adhesive force, did not contaminate the adherend surface, and had a low peeling static voltage when the surface protective film was peeled from the adherend.
On the other hand, the surface protective film of comparative example 1 containing the antistatic agent in the adhesive layer was good at a low peeling static voltage when the surface protective film was peeled from the adherend, but the contamination of the adherend after peeling was increased.
In addition, in the surface protection film of comparative example 2 in which the antistatic agent was not contained in both the adhesive layer of the surface protection film and the release agent layer of the release film, the staining property to the adherend was good, but the peeling electrostatic voltage at the time of peeling the surface protection film from the adherend was high.
That is, in the surface protection film of comparative example 1 in which the antistatic agent is contained in the adhesive agent layer of the surface protection film and in the surface protection film of comparative example 2 in which the antistatic agent is not contained in both the adhesive agent layer of the surface protection film and the release agent layer of the release film, it is difficult to achieve both reduction of the release electrostatic voltage and staining property to the adherend.
On the other hand, in the surface protective films of examples 1 to 4 in which the antistatic agent and the ester plasticizer were contained in the release agent layer of the release film, and then the antistatic agent and the ester plasticizer of the release agent layer were transferred only to the surface of the adhesive agent layer, since a significant effect of reducing the release electrostatic voltage was obtained by adding a small amount of the ester plasticizer, there was no contamination to the adherend, and the antistatic property was also good.
In addition, the surface protective film of comparative example 3, in which the release agent layer contained only the antistatic agent and did not contain the ester plasticizer, was free from contamination of the adherend and also had good antistatic performance. However, the peeling electrostatic voltage was increased as compared with the surface protective films of examples 1 to 4 in which the antistatic agent and the ester plasticizer were contained in the peeling agent layer.
Industrial applicability
The surface protective film of the present invention can be used for protecting the surface by being bonded to an optical member or the like in a production process of an optical film such as a polarizing plate, a retardation plate, or a lens film, or other various optical members. Further, the surface protective film of the present invention can reduce the amount of electrostatic voltage generated when peeled from an adherend, and is less likely to cause a change in antistatic performance with time and contamination of the adherend, and can improve the yield of the production process, thereby having a high industrial value.

Claims (4)

1. A surface protection film comprising a base film made of a transparent resin, an adhesive layer formed on one surface of the base film, and a release film having a release agent layer bonded to the adhesive layer,
the release film is formed by laminating a release agent layer on one surface of a resin film, wherein the release agent layer contains a release agent containing polydimethylsiloxane as a main component, an antistatic agent which does not react with the release agent, and an ester plasticizer containing at least one ether bond,
the ester plasticizer is at least one selected from the group consisting of diethylene glycol di-2-ethylhexanoate, tetraethylene glycol di-2-ethylhexanoate, hexaethylene glycol di-2-ethylhexanoate, triethylene glycol diethylbutyrate, polyethylene glycol diethylbutyrate, polypropylene glycol diethylhexanoate, triethylene glycol dibenzoate, tetraethylene glycol dibenzoate, polyethylene glycol dibenzoate, polypropylene glycol dibenzoate, and polyethylene glycol-2-ethylhexanoate benzoate,
the antistatic agent component is an ionic compound having a melting point of 30-80 ℃, the antistatic agent component and the ester plasticizer are transferred from the release agent layer of the release film to the surface of the adhesive layer,
the peeling static voltage when the adhesive layer is peeled from an adherend is reduced.
2. The surface protective film according to claim 1, wherein the adhesive layer is formed by crosslinking an adhesive composition containing a (meth) acrylate copolymer and a crosslinking agent.
3. The surface protective film according to claim 1 or 2, wherein a peeling force when peeling the release film from the adhesive layer is 0.2N/50mm or less.
4. An optical member obtained by bonding the surface protective film according to any one of claims 1 to 3.
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TW201800234A (en) 2018-01-01
KR102027147B1 (en) 2019-10-01

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