CN117965109A - Antistatic surface protection film - Google Patents

Antistatic surface protection film Download PDF

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Publication number
CN117965109A
CN117965109A CN202410203244.3A CN202410203244A CN117965109A CN 117965109 A CN117965109 A CN 117965109A CN 202410203244 A CN202410203244 A CN 202410203244A CN 117965109 A CN117965109 A CN 117965109A
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CN
China
Prior art keywords
surface protective
antistatic
protective film
film
release
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Pending
Application number
CN202410203244.3A
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Chinese (zh)
Inventor
小林弘幸
新见洋人
春日充
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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Publication of CN117965109A publication Critical patent/CN117965109A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • C09J7/405—Adhesives in the form of films or foils characterised by release liners characterised by the substrate of the release liner
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—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
    • 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
    • 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
    • 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
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/255—Polyesters
    • 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
    • G02B1/14—Protective coatings, e.g. hard 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
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
    • 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

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention provides an antistatic surface protection film which has little pollution to an adherend and excellent stripping antistatic performance without time degradation, and is easy to strip a stripping sheet when in use. The antistatic surface protection film is formed by forming an adhesive layer (2) on one surface of a base film (1) composed of a transparent resin, and attaching a release sheet (5) to the surface of the adhesive layer (2), wherein the release sheet (5) is formed by having a release agent layer (4) on one surface of a base (3), and the release agent layer (4) is formed from a resin composition containing a release agent mainly composed of dimethylpolysiloxane and an antistatic agent.

Description

Antistatic surface protection film
The application is a divisional application of Chinese patent application with the application number 201610857251.0, the application date of 2016, 9 and 27 and the application name of antistatic surface protection film, and the application claims priority from Japanese patent application No. 2015-212030, 10 and 28, which are filed in Japan.
Technical Field
The present invention relates to an antistatic surface protective film to be bonded to the surface of an optical member (hereinafter, also referred to as an optical film) such as a polarizing plate, a retardation plate, and a lens film for a display. More specifically, the present invention provides an antistatic surface protective film which has excellent peel-off antistatic properties that are less likely to cause contamination of an adherend and which are not degraded over time, and which is easily peeled off a release sheet when used.
Background
When manufacturing and transporting optical films such as polarizing plates, retardation plates, optical films for displays, antireflection films, hard coating films, transparent conductive films for touch panels, and optical products such as displays using these films, a surface protective film is bonded to the surface of the optical films, so that fouling and flaws on the surface in subsequent steps can be prevented. In order to save the labor required for peeling off the surface protective film and re-bonding the surface protective film, the visual inspection of the optical film as an optical product may be performed in a state where the surface protective film is directly bonded to the optical film, thereby improving the work efficiency.
Conventionally, in order to prevent the adhesion of scratches or dirt in the production process of an optical product, a surface protective film having an adhesive layer on one surface of a base film has been generally used. The surface protective film is bonded to the optical film via an adhesive layer having a low adhesion force. The reason why the adhesive layer is made slightly adhesive is that when the used surface protective film is peeled off from the surface of the optical film, the adhesive layer can be easily peeled off, and the adhesive is not adhered and remains (that is, generation of a residual adhesive is prevented) on the optical film as a product of an adherend.
In recent years, in the production process of a liquid crystal display panel, the following phenomena occur although the number of produced products is small: the peeling static voltage generated when the surface protective film attached to the optical film is peeled off and removed causes a phenomenon in which circuit components such as a driver IC for controlling a display screen of the liquid crystal display panel are damaged or a phenomenon in which alignment of liquid crystal molecules is damaged.
In order to reduce the power consumption of the liquid crystal display panel, the driving voltage of the liquid crystal material is lowered, and the breakdown voltage of the driving IC is lowered accordingly. In recent years, it has been demanded to set the stripping static voltage to a range of +0.7kV to-0.7 kV.
Therefore, there has been proposed a surface protective film using an adhesive layer containing an antistatic agent for preventing a problem caused by a high peeling static voltage and for suppressing the peeling static voltage at a low level when the surface protective film is peeled from an optical film as an adherend.
For example, patent document 1 discloses a surface protective film using an adhesive formed from an alkyl trimethylammonium 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 an adhesive sheet using the adhesive composition.
Patent document 3 discloses an adhesive composition comprising an acrylic polymer, a polyether polyol compound, an alkali metal salt treated with an anion-adsorbing 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.
Patent document 5 discloses an adhesive composition comprising an acrylic copolymer, an alkylene oxide chain-containing acrylic copolymer, and an alkali metal salt, and a surface protective film using the adhesive composition.
Prior art literature
Patent literature
Patent document 1: JP-A2005-131957
Patent document 2: japanese patent laid-open No. 2005-330464
Patent document 3: JP-A2005-314476
Patent document 4: japanese patent laid-open No. 2006-152235
Patent document 5: japanese patent laid-open No. 2009-275128
Disclosure of Invention
Technical problem to be solved by the invention
In patent documents 1 to 5, although the antistatic agent is added to the inside of the adhesive layer, the thicker the adhesive layer, the greater the amount of the antistatic agent transferred from the adhesive layer to the adherend to which the surface protective film is attached with the lapse of time. In addition, in optical films such as Low reflection (LR, low reflection) polarizers and anti-glare (AG, ANTI GLARE) -LR polarizers, the surface of the optical film is treated with a silicone compound, a fluorine compound, or the like to prevent contamination, so that the peeling electrostatic pressure when the surface protective film used for the optical film is peeled from the optical film as an adherend is increased.
In recent years, with the spread of 3D displays (stereoscopic displays), polarizing (FPR, FILM PATTERNED RETARDER) films are sometimes attached to the surfaces of optical films such as polarizers. After the surface protective film bonded to the surface of the optical film such as a polarizer is peeled off, the FPR film is bonded. However, if the surface of an optical film such as a polarizer is contaminated with an adhesive or an antistatic agent used for the surface protective film, there is a problem in that it is difficult to adhere the FPR film. Therefore, the surface protective film used for this purpose is required to be less contaminated with an adherend.
On the other hand, in some liquid crystal display panel factories, as a method for evaluating the contamination of an adherend with a surface protective film, the following method is adopted: a method in which a surface protective film bonded to an optical film such as a polarizing plate is temporarily peeled off, and then bonded again in a state of being mixed with air bubbles, and then the film is subjected to a heat treatment under a predetermined condition, and then the surface protective film is peeled off to observe the surface of an adherend. In this evaluation method, if there is a difference in surface contamination of the adherend between the portion where the bubbles are mixed and the portion where the adhesive of the surface protective film contacts even if the surface contamination of the adherend is minute, the surface contamination of the adherend remains as marks of bubbles (sometimes referred to as bubble permeation). Therefore, as a method for evaluating the contamination of the surface of the adherend, the evaluation method is a very strict evaluation method. In recent years, there has been a demand for a surface protective film that has no problem in terms of contamination of the surface of an adherend even in the result of determination by such a strict evaluation method. However, in the surface protective film using the adhesive layer containing the antistatic agent, which has been proposed conventionally, there is a problem that it is difficult to solve the problem.
Therefore, there is a need for a surface protective film for an optical film that causes little contamination of an adherend and does not change the contamination of the adherend over time. Further, a surface protective film capable of suppressing the peeling static voltage at the time of peeling from an adherend is demanded.
In addition, in order to protect the adhesive layer, a release film is often attached to the conventional surface protective film (in this case, the base material of the release film is a resin film) (in the examples of patent documents 1 to 5, the release film is also used). However, in the case of using a release film for protecting the adhesive layer, since the base film of the surface protective film is also a resin film, there is a problem that when the release film is peeled from the surface protective film, it is difficult to establish the "start" of peeling of the release film, and thus it is difficult to peel the release film. Therefore, an adhesive tape such as a pick-up tape (pick-up tape) may be attached to both the surface of the base film and the surface of the release film of the surface protective film, and the release film may be peeled from the film by gripping the pick-up tape.
In the case of attaching the surface protective film to an optical member such as an optical film as an adherend by roll-to-roll, the peeling operation of the release film may be completed at the first time.
However, in the case of using the cut sheet-like surface protective film attached to an adherend, an operation of peeling the release film from the surface protective film is required in accordance with the number of cut surface protective films, and therefore, it is required to easily peel the release film.
In addition, when the surface protective film is cut and attached to an adherend, the cut surface protective film is generally circulated in a state of being overlapped in a number of several tens to several hundreds, and in the step of using the surface protective film, the surface protective film is taken out one by one from a bundle of a plurality of overlapped surface protective films and used.
Therefore, in the case where the base material of the release sheet used for the surface protective film is a resin film, the base material film and the base material of the release sheet which are in contact with each other in a state where a plurality of surface protective films are stacked, both are resin films, and adhesion is caused. Therefore, when the surface protective films are picked up one by one from the surface protective films supplied in a state of being stacked in a plurality of sheets, a problem occurs in that two or more sheets are simultaneously picked up.
Further, in the case where the base material of the surface protective film is a resin film, in the cutting step of the surface protective film, the cutting operation is difficult due to the lack of elasticity, and if the cutting condition is made more severe so that the cutting surface can be cut neatly, there is a problem that the consumption of the cutting blade becomes fast.
The present inventors have conducted intensive studies in order to solve these problems.
In order to reduce contamination of an adherend and to reduce the change with time of antistatic performance, it is necessary to reduce the amount of antistatic agent added, which is presumed to be responsible for contamination of the adherend. However, when the amount of the antistatic agent to be added is reduced, the peeling static voltage at the time of peeling the surface protective film from the adherend becomes high. The present inventors have discussed a method of suppressing the peeling static voltage at the time of peeling the surface protective film from the adherend, without increasing the absolute amount of the addition amount of the antistatic agent. As a result, it has been 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 low by applying and drying the adhesive composition, laminating the adhesive layer, and then applying an appropriate amount of an antistatic agent component to the surface of the adhesive layer, instead of forming the adhesive layer by adding and mixing the antistatic agent to the adhesive composition. It is also clear that the use of a release sheet containing paper can easily release the release sheet in order to protect the adhesive layer of the surface protective film, and the present application has been completed.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an antistatic surface protective film which is less in contamination of an adherend and has excellent peeling antistatic performance without deterioration with time, and which is easy to peel off a release sheet when used.
Technical means for solving the technical problems
In order to solve the above-described problems, the present invention is directed to an antistatic surface protective film of the present invention, which is obtained by applying and drying an adhesive composition and laminating an adhesive layer, and then applying an appropriate amount of an antistatic agent to the surface of the adhesive layer, wherein the surface protective film is less likely to cause contamination to an adherend and is less likely to cause peeling static voltage when peeling the surface protective film from an optical film as an adherend.
In order to solve the above-described problems, the present invention provides an antistatic surface protective film comprising a base film made of a transparent resin and a release sheet bonded to the surface of the adhesive layer, wherein the release sheet comprises a release agent layer on one surface of the base film, and the release agent layer comprises a resin composition containing a release agent mainly composed of dimethylpolysiloxane and an antistatic agent.
Further, the substrate is preferably a substrate containing paper.
In addition, the antistatic agent is preferably an alkali metal salt.
The adhesive layer is preferably an acrylic adhesive layer formed by crosslinking a (meth) acrylate copolymer.
The present invention also provides an optical film formed by bonding the above-described antistatic surface protective film in a state in which the release sheet has been released.
The present invention also provides an optical member formed by bonding the above-described antistatic surface protective film in a state in which the release sheet has been released.
Effects of the invention
The antistatic surface protective film of the present invention is easy to peel off a release sheet when in use, and has little contamination to an adherend and low contamination to an adherend without change with time. Further, according to the present invention, it is possible to provide an antistatic surface protective film which, even when the surface of an adherend such as an LR polarizer or an AG-LR polarizer is an optical film which has been subjected to anti-contamination treatment with a silicone compound or a fluorine compound, can suppress the peeling static voltage generated when peeling from the adherend to a low level after the antistatic surface protective film is temporarily attached to the adherend, and has excellent peeling antistatic performance which does not deteriorate with time.
According to the antistatic surface protective film of the present invention, since the surface of the optical film can be protected surely, improvement in productivity and improvement in yield can be achieved.
Drawings
Fig. 1 is a schematic cross-sectional view showing an antistatic surface protective film of the present invention;
Fig. 2 is a sectional view showing a state after the peeling film is peeled from the antistatic surface protective film of the present invention;
Fig. 3 is a cross-sectional view showing one embodiment of the optical member of the present invention.
Description of the reference numerals
1 … Substrate film; 2 … adhesive layers; 3 … substrates; 4 … stripper layers; 5 … release sheets; 7 … antistatic agent; 8 … adherend (optical member); 10 … antistatic surface protective film; 11 … peeling off the antistatic surface protective film in the state of the peeling sheet; 20 … is attached with an antistatic surface protective film.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Fig. 1 is a schematic cross-sectional view showing an antistatic surface protective film of the present invention. The antistatic surface protective film 10 has an adhesive layer 2 formed on one surface of a transparent base film 1. A release sheet 5 having a release agent layer 4 formed on the surface of the base material 3 is bonded to the surface of the adhesive layer 2.
As the base film 1 used in the antistatic surface protective film 10 of the present invention, a base film formed of a resin having transparency and flexibility is used. Thus, the appearance inspection of the optical member can be performed in a state where the antistatic surface protective film is attached to the optical member as the adherend. As the film made of the transparent resin used as the base film 1, a polyester film such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, polybutylene terephthalate, or the like is suitably used. In addition to the polyester film, a film formed of other resin may be used as long as it has a desired strength and optical adaptability. The base film 1 may be a non-stretched film or a uniaxially or biaxially stretched film. The stretching 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 antistatic surface protective film 10 of the present invention is not particularly limited, but is preferably about 12 to 100 μm, for example, and is more preferably about 20 to 50 μm, since handling is easier.
Further, an antifouling layer, an antistatic layer, a scratch-preventing hard coat layer, or the like, which prevents surface dirt, may be provided on the surface of the base film 1 opposite to the surface on which the adhesive layer 2 is formed, as necessary. Further, the surface of the base film 1 may be subjected to an easy-to-adhere treatment such as surface modification by corona discharge and application of an anchor agent (anchor coat agent).
The adhesive layer 2 formed in the antistatic surface protective film 10 of the present invention is not particularly limited as long as it adheres to the surface of an adherend, can be easily peeled off after use, and is less likely to contaminate the adherend.
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 functional monomer such as acrylonitrile, vinyl acetate, methyl methacrylate, or ethyl acrylate, or acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate, glycidyl methacrylate, or N-methylolmethacrylamide. The (meth) acrylate copolymer may contain, as the comonomer, one or more monomers other than (meth) acrylate, as well as (meth) acrylate as the main monomer and the comonomer.
Further, a polyoxyalkylene-containing compound may be copolymerized or mixed with the (meth) acrylate copolymer. 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, methoxypolypropylene glycol (400) methacrylate, and the like. By copolymerizing these polyoxyalkylene group-containing monomers with the main monomer or functional monomer of the (meth) acrylate copolymer, an adhesive formed of the polyoxyalkylene group-containing copolymer can be obtained.
The polyoxyalkylene group-containing compound that can be mixed with the (meth) acrylate copolymer is preferably a polyoxyalkylene group-containing (meth) acrylate copolymer, and more preferably a polyoxyalkylene group-containing (meth) acrylic monomer polymer, and examples thereof 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, methoxypolypropylene glycol (400) methacrylate, and the like. By mixing these polyoxyalkylene group-containing compounds with the (meth) acrylate copolymer, an adhesive to which the polyoxyalkylene group-containing compounds are added can be obtained.
As the curing agent added to the adhesive layer 2, isocyanate compounds, epoxy compounds, melamine compounds, metal chelate compounds, and the like are exemplified as the crosslinking agent for crosslinking the (meth) acrylate copolymer. Examples of the thickener include rosins, coumarone-indenes, terpenes, petroleum, phenols, and the like.
The thickness of the adhesive layer 2 used in the antistatic 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 antistatic surface protective film is excellent in handling property when peeled from the adherend, the adhesive layer 2 having a micro adhesive force is preferable in which the peel strength (adhesive force) of the antistatic surface protective film to the surface of the adherend is about 0.03 to 0.3N/25 mm. Further, since the handling property is excellent when the release sheet 5 is peeled from the surface protective film 10, the peeling force when the release sheet 5 is peeled from the adhesive layer 2 is preferably 0.2N/50mm or less.
In the release sheet 5 used in the antistatic surface protective film 10 of the present invention, the release agent layer 4 is formed on one surface of the base material 3, and the release agent layer 4 is formed of a resin composition containing a release agent mainly composed of dimethylpolysiloxane and an antistatic agent.
The substrate 3 may be a paper-containing substrate, and may be a single paper or may be a paper in which other materials such as plastics are laminated. Specifically, examples of the paper unit include fine paper, art paper, kraft paper, laterite (clay paper), and cellophane; examples of the paper laminated with other materials such as plastic include polyethylene laminated high-grade paper, polyethylene laminated art paper, and polyethylene laminated kraft paper.
The thickness of the base material 3 is not particularly limited, but is preferably about 30 to 200 μm, and more preferably about 50 to 150 μm because of easy handling.
Further, if necessary, a surface modification by frame treatment (frame treatment) or corona discharge, a coating of a filler for preventing penetration of a release agent coating into paper, or the like may be performed on the surface of the base material 3.
By using a base material containing paper as the base material 3, operability in peeling the release sheet from the antistatic surface protective film can be improved. The antistatic surface protection film 10 of the present invention is composed of a base film 1, an adhesive layer 2, and a release sheet 5.
In general, when a release sheet is peeled from a surface protective film, the surface protective film is slightly deformed by bending, and the side surface of the surface protective film is rubbed with a finger web, and the edge portion of the release sheet is caught by the finger web, thereby producing a "head" of the release sheet. After the "tab" for peeling the release sheet from the surface protective film is formed, the "tab" portion of the release sheet may be grasped for peeling. In the case where the member of the adhesive layer for protecting the surface protective film is a release film using a base film of the same kind of material as the base film, even if the surface protective film is slightly deformed by bending, the base film and the release film are deformed simultaneously, and thus "lifting" is hard to occur, and the release film is hard to peel.
In contrast, in the antistatic surface protective film 10 of the present invention, since the base material 3 containing paper is used as the base material 3 of the release sheet 5, the base material film 1 and the release sheet 5 have different elasticity (elastic modulus), and the release sheet is easily peeled from the antistatic surface protective film. Therefore, the operation efficiency of peeling the release sheet from the antistatic surface protective film and attaching it to the optical member is good.
In addition, according to the type and use of the optical member as the adherend of the antistatic surface protective film of the present invention, the antistatic surface protective film may be bonded to an optical member of a predetermined size by cutting into a sheet-like shape instead of bonding the antistatic surface protective film to the optical member by roll-to-roll. In this case, the antistatic surface protective film is picked up one by one from a bundle of antistatic surface protective films in a state of being stacked in a plurality of sheets, and after the release sheet is peeled off, the film is bonded to the optical member.
When the member for protecting the adhesive layer of the antistatic surface protective film is a release film using a resin film, the substrate film and the substrate film of the release film, which are in contact with each other in a state where a plurality of antistatic surface protective films are stacked, are both resin films, resulting in adhesion. Therefore, when the antistatic surface protective films are taken one by one from the antistatic surface protective films supplied in a state of being overlapped by a plurality of sheets, a problem occurs in that two or more sheets are taken at the same time. By using a base material containing paper as the base material of the release sheet, the paper layer of the base material of the release sheet having a surface of a material different from that of the base material film is brought into contact with the base material film, so that it is possible to prevent a problem that two or more antistatic surface protective films are simultaneously taken out.
Further, since the number of times of peeling the release sheet from the antistatic surface protective film is the same as the number of sheets of the cut antistatic surface protective film, by using the antistatic surface protective film of the present invention excellent in operability of peeling the release sheet, improvement in operation efficiency can be achieved.
Examples of the release agent containing dimethylpolysiloxane as a main component constituting the release agent layer 4 include known silicone release agents such as addition reaction type, condensation reaction type, cationic polymerization type, and radical polymerization type. As products of the addition reaction type silicone-based release agent, for example, KS-776A, KS-847T, KS-779H, KS-837, KS-778, KS-830 (manufactured by Xinyue 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.) and the like are mentioned. Products of condensation reaction type silicone release agents that are commercially available include, for example, SRX-290 and SYLOFF-23 (Dow Corning Toray Co., ltd.). Examples of commercially available cationic polymerization type silicone release agents include TPR-6501, TPR-6500, UV9300, VU9315, UV9430 (manufactured by Momentive Performance Materials Company), X62-7622 (manufactured by Xinyue chemical industries, ltd.). The commercially available radical polymerization type silicone release agent is available as X62-7205 (manufactured by Xinyue chemical industries, ltd.).
As the antistatic agent constituting the release agent layer 4, an antistatic agent which has good dispersibility in a release agent solution containing dimethylpolysiloxane as a main component and does not inhibit the curing of the release agent containing dimethylpolysiloxane as a main component is preferable. Alkali metal salts are very suitable for use as such antistatic agents.
Examples of the alkali metal salt include metal salts composed of lithium, sodium and potassium. Specifically, for example, a metal salt composed of a cation selected from Li +、Na+、K+ and an anion selected from Cl－、Br－、I－、BF4 －、PF6 －、SCN－、ClO4 －、CF3SO3 －、(CF3SO2)2N－、(C2F5SO2)2N－、(CF3SO2)3C－ is suitably used. Of these, a lithium salt such as LiBr、LiI、LiBF4、LiPF6、LiSCN、LiClO4、LiCF3SO3、Li(CF3SO2)2N、Li(C2F5SO2)2N、Li(CF3SO2)3C is particularly preferably used. These alkali metal salts may be used alone or in combination of two or more. In order to stabilize the ionic substance, a compound 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 type of the antistatic agent and the degree of affinity with the release agent, but may be set in consideration of the peeling static voltage expected when peeling the antistatic surface protective film from the adherend, the contamination property to the adherend, the adhesive property, and the like.
The method of mixing the stripping agent containing dimethylpolysiloxane as the 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 and mixed to a release agent containing dimethylpolysiloxane as a main component, and then a release agent curing catalyst is added and mixed; a method in which a stripping agent containing dimethylpolysiloxane as a main component is diluted with an organic solvent in advance, and then an antistatic agent and a catalyst for curing the stripping agent are added and mixed; and a method in which a stripping agent containing dimethylpolysiloxane as a main component is diluted in an organic solvent, a catalyst is added and mixed, and an antistatic agent is added and mixed. Further, if necessary, an adhesion improver such as a silane coupling agent, or a material having an auxiliary antistatic effect such as a polyoxyalkylene-containing compound may be added.
The mixing ratio of the release agent mainly composed of dimethylpolysiloxane and the antistatic agent is not particularly limited, but the antistatic agent is preferably 5 to 100 parts in terms of solid content relative to 100 parts in terms of solid content of the release agent mainly composed of dimethylpolysiloxane. If the amount of the antistatic agent to be added is less than 5 parts in terms of the solid content per 100 parts of the solid content of the release agent containing dimethylpolysiloxane as the main component, the transfer amount of the antistatic agent to the surface of the adhesive layer decreases, and it is difficult to exert the antistatic function of the adhesive. If the amount of the antistatic agent added is more than 100 parts in terms of the solid content per 100 parts of the solid content of the release agent mainly composed of dimethylpolysiloxane, the antistatic agent and the release agent mainly composed of dimethylpolysiloxane are simultaneously transferred to the surface of the adhesive layer, and therefore, the adhesive property of the adhesive may be lowered.
The method of forming the adhesive layer 2 on the base film 1 of the antistatic surface protective film 10 and the method of bonding the release sheet 5 according to the present invention may be performed by a known method, and are not particularly limited. Specifically, the following methods may be mentioned: (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 sheet 5 is bonded; (2) Any method may be used, such as a method of applying a resin composition for forming the adhesive layer 2 on the surface of the release sheet 5, drying the composition to form the adhesive layer, and then bonding the substrate film 1.
The adhesive layer 2 may be formed on the surface of the base film 1 by a known method. Specifically, a known coating method such as reverse coating (reverse coating), doctor blade coating (comma coating), gravure coating, slot die coating (slot coating), meyer rod coating, or air knife coating can be used.
In the same manner, the formation of the release agent layer 4 on the substrate 3 may be performed by a known method. Specifically, a known coating method such as gravure coating, meyer rod coating, or air knife coating can be used.
The antistatic surface protective film 10 of the present invention having the above-described structure is preferably applied to an optical film as an adherend in a state where the release sheet 5 is peeled off, and then the surface potential at the time of peeling from the optical film is preferably +0.7kV to-0.7 kV. Further, the surface potential is more preferably +0.5kV to-0.5 kV, particularly preferably +0.1kV to-0.1 kV.
Fig. 2 is a sectional view showing a state in which a release film is peeled from an antistatic surface protective film of the present invention.
By peeling the release sheet 5 from the antistatic surface protective film 10 shown in fig. 1, the component of the antistatic agent (symbol 7) contained in the release agent layer 4 of the release sheet 5 is transferred to the surface of the adhesive layer 2 of the antistatic surface protective film 10, and is present only on the surface of the adhesive layer. Therefore, in fig. 2, the components of the antistatic agent transferred onto the surface of the adhesive layer 2 of the antistatic surface protective film 11 in a state where the release sheet is peeled off are indicated by the spots denoted by 7.
In the antistatic surface protective film of the present invention, when the antistatic surface protective film 11 in the state of peeling off the release sheet shown in fig. 2 is attached to an adherend, only the component of the antistatic agent present on the surface of the adhesive layer 2 comes into contact with the surface of the adherend. Thus, the peeling static voltage when the antistatic surface protective film is peeled off from the adherend again can be suppressed to a low level.
Fig. 3 is a cross-sectional view showing an embodiment of the optical member of the present invention.
The release sheet 5 is peeled from the antistatic 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 an antistatic surface protective film 11 in a state of peeling off a release sheet from an antistatic surface protective film 10 of the present invention is attached. Examples of the optical member include a polarizing plate, a phase difference plate, a lens film, a polarizing plate simultaneously functioning as a phase difference plate, and an optical film such as a polarizing plate simultaneously functioning 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 device such as various gauges, and the like. Examples of the optical member include an optical film such as an antireflection film, a hard coat film, and a transparent conductive film for a touch panel. In particular, the antistatic surface protective film is suitably used as an antistatic surface protective film bonded to a surface of an optical film which has been subjected to anti-contamination treatment on the surface using a silicone compound, a fluorine compound, or the like, and the optical film is a low reflection treated polarizer (LR polarizer), an anti-glare low reflection treated polarizer (AG-LR polarizer), or the like.
According to the optical member of the present invention, when the antistatic surface protective film 11 in the state of peeling off the peeling sheet is peeled off from the optical member (optical film) as an adherend, peeling off static voltage can be suppressed sufficiently low, and therefore, there is no need to worry about damaging circuit components such as a driving IC, a TFT element, a gate line driving circuit, etc., and the production efficiency of the process of manufacturing a liquid crystal display panel, etc., can be improved, and the reliability of the production process can be maintained.
Examples
The present invention will be described in further detail with reference to examples.
Example 1
(Production of antistatic surface protective film)
10 Parts by weight of addition reaction type silicone (Dow Corning Toray co., ltd., trade name: SRX-211), 1.0 parts by weight of lithium difluorosulfimide, 90 parts by weight of a mixed solvent of toluene and ethyl acetate at 1:1, and 0.06 parts by weight of a platinum catalyst (Dow Corning Toray co., ltd., trade name: SRX-212) were mixed, stirred, and mixed to prepare a coating material for forming a stripper layer of example 1. The coating material for forming the release agent layer of example 1 was applied by mayer bar coating to the polyethylene layer side of the polyethylene laminated high-grade paper prepared by laminating the polyethylene layer to a thickness of 20 μm on one side of the high-grade paper having a weight of 53g per square meter, and the resultant was dried to a thickness of 0.5 μm by using a hot air circulation oven at 130℃for 1 minute, to obtain the release sheet of example 1.
On the other hand, the adhesive composition of example 1 was prepared by stirring and mixing 2 parts by weight of an isocyanate-based curing agent (cornonate (registered trademark) HX manufactured by TOSOH CORPORATION) with 100 parts by weight of a 40% ethyl acetate solution of the adhesive polymer of example 1, which was formed of 90 parts by weight of 2-ethylhexyl acrylate, 7 parts by weight of methoxypolyethylene glycol (400) methacrylate, and 3 parts by weight of a copolymer of 2-hydroxyethyl acrylate.
The adhesive composition of example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38. Mu.m, and dried to a thickness of 20. Mu.m, followed by drying in a hot air circulation oven at 100℃for 2 minutes to form an adhesive layer. Then, the release sheet of example 1 prepared as described above was bonded to the surface of the adhesive layer via a release agent layer (silicone-treated surface), to obtain a laminated film. The resulting laminate film was kept at 40℃for 5 days, and the adhesive layer was cured to obtain an antistatic surface protective film of example 1.
Example 2
Except that the addition reaction type silicone of example 1 was changed to one having a trade name of KS-847H manufactured by Xinyue chemical Co., ltd., and the platinum catalyst was changed to one having a trade name of CAT PL-50T manufactured by Xinyue chemical Co., ltd., with an addition amount of 0.1 part by weight, an antistatic surface protective film of example 2 was obtained in the same manner as in example 1 except that lithium bis (fluorosulfonyl) imide was changed to lithium bis (trifluoromethanesulfonyl) imide.
Comparative example 1
A surface protective film of comparative example 1 having no peeling antistatic property was obtained in the same manner as in example 1 except that the lithium bis-fluorosulfonyl imide of example 1 was not used.
Comparative example 2
10 Parts by weight of addition reaction type silicone (Dow Corning Toray co., ltd., trade name: SRX-211), 90 parts by weight of a mixed solvent of toluene and ethyl acetate at 1:1, and 0.06 parts by weight of a platinum catalyst (Dow Corning Toray co., ltd., trade name: SRX-212) were mixed, and stirred and mixed to prepare a coating material for forming a stripper layer of comparative example 2. The coating material for forming the release agent layer of comparative example 2 was applied by mayer rod coating to the polyethylene surface of the polyethylene laminated high-grade paper, which was prepared by laminating a polyethylene layer having a thickness of 20 μm on one surface of the high-grade paper having a weight of 53g per square meter, and the dried high-grade paper was dried to a thickness of 0.5 μm by using a hot air circulating oven at130℃for 1 minute, to obtain a release sheet of comparative example 2.
On the other hand, the adhesive composition of comparative example 2 was prepared by mixing 3 parts by weight of a 10% ethyl acetate solution of lithium difluorosulfimide and 2 parts by weight of an isocyanate-based curing agent (cornonate (registered trademark) HX manufactured by TOSOH CORPORATION) with respect to 100 parts by weight of a 40% ethyl acetate solution of the adhesive polymer of example 1, and the adhesive composition of comparative example 2 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm so as to have a thickness of 20 μm after drying, and then dried for 2 minutes using a hot air circulation oven at 100 ℃. Then, the release sheet of comparative example 2 prepared as described above was attached to the surface of the adhesive layer via a release agent layer (silicone-treated surface), to thereby obtain a laminated film. The resulting laminate film was kept at 40℃for 5 days, and the adhesive layer was cured to obtain an antistatic surface protective film of comparative example 2.
The method and results of the evaluation test are shown below. The surface protective films used in the method of evaluation test were antistatic surface protective films in examples 1 to 2 and comparative example 2, and surface protective films having no peeling antistatic performance in comparative example 1.
< Method for measuring peel force of Release sheet >
Samples of the surface protective film were sheared to 50mm wide and 150mm long. The strength of the release sheet was measured in the 180℃direction at a release rate of 300 mm/min under a test environment of 23℃X 50% RH using a tensile tester, and the peel force (N/50 mm) of the release sheet was used.
< Method for measuring adhesive force of surface protective film >
An anti-glare low reflection treatment 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 and peeled off was attached to the surface of the polarizing plate, and the film was stored for one day in a test environment of 23 ℃ x 50% rh. Thereafter, the strength at the time of peeling the surface protective film was measured in the direction of 180℃at a peeling speed of 300 mm/min using a tensile tester, and this was taken as an adhesive force (N/25 mm).
(Method for measuring surface resistivity of adhesive layer)
After the release sheet was peeled off from the surface protective film sample, the surface resistivity (Ω/≡) of the adhesive layer was measured using a high-performance high-resistivity meter (Mitsubishi CHEMICAL ANALYTECH co., ltd. Hiresta (registered trademark) -UP) under the conditions of an applied voltage of 100V and a measurement time of 30 seconds.
< Method for measuring peeling static Voltage of surface protective film >
An anti-glare low reflection treatment 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 and peeled off was attached to the surface of the polarizing plate, and then stored for one day in a test environment of 23 ℃ x 50% rh. The surface protective film was then peeled off at a peeling rate of 40m per minute using a high-speed peeling tester (TESTER SANGYO manufactured), while the surface potential of the polarizer surface was measured every 10ms using a surface potentiometer (keyencco., ltd.) and the maximum value of the absolute value of the surface potential at this time was taken as the peeling static voltage (kV).
< Method for confirming surface contamination of surface protective film >
An anti-glare low reflection treatment 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 in the form of a peeled sheet, which was cut to a width of 25mm, was attached to the surface of the polarizing plate, and the film was stored for 3 days and 30 days under a test environment of 23 ℃ x 50% rh. The surface protective film was then peeled off, and the surface of the polarizing plate was visually observed for contamination. As a criterion for the surface contamination, the case where no contamination transfer was observed on the polarizing plate was evaluated as (o), and the case where contamination transfer was observed on the polarizing plate was evaluated as (x).
The measurement results of the antistatic surface protective films of examples 1 and 2, the surface protective film of comparative example 1 having no peeling antistatic property, and the antistatic surface protective film of comparative example 2 are shown in table 1. "2EHA" is 2-ethylhexyl acrylate, "HEA" is 2-hydroxyethyl acrylate, "#400G" is methoxypolyethylene glycol (400) methacrylate, "AS (1)" is lithium bis-fluorosulfonyl imide, "AS (2)" is lithium bis-trifluoromethanesulfonyl imide, "SRX-211" is SRX-211, "KS-847H" is KS-847H, "SRX-212" is platinum catalyst SRX-212, "PL-50T" is platinum catalyst CAT PL-50T. The "4.7E10" of the surface resistivity is 4.7X10 10, and the "overscan" means that the surface resistivity is out of the measurement range of the measuring instrument, that is, 1.0X10 13 Ω/≡or more.
TABLE 1
From the measurement results shown in table 1, the following conclusions can be drawn.
The antistatic surface protective films of examples 1 to 2 of the present invention had moderate adhesion, did not contaminate the surface of the adherend, and had low peel static electricity when peeled from the adherend after the antistatic surface protective film was temporarily attached to the adherend.
On the other hand, in the surface protective film having no peeling antistatic property of comparative example 1 in which the antistatic agent was not added to the peeling agent layer, the peeling electrostatic pressure was increased when the surface protective film was once attached to the adherend and then peeled from the adherend.
In addition, in the antistatic surface protective film of comparative example 2 in which the antistatic agent was added to the adhesive layer, the antistatic surface protective film was temporarily attached to the adherend, and then the antistatic surface protective film was peeled off from the adherend, but the peeling static electricity was low and good, but the contamination of the adherend after peeling was increased.
That is, in the surface protective film of comparative example 1 having no peeling antistatic property and the antistatic surface protective film of comparative example 2, it is difficult to reduce both peeling static voltage and contamination to an adherend. On the other hand, in the antistatic surface protective films of examples 1 to 2 in which the antistatic agent was added to the release agent layer of the release sheet and then transferred onto the surface of the adhesive layer so that the antistatic agent component was present only on the surface of the adhesive layer, the antistatic agent was added in a small amount to reduce the peeling static voltage, and thus a good antistatic surface protective film free from contamination of an adherend was obtained.
Industrial applicability
The antistatic surface protective film of the present invention can be used for protecting the surfaces of various optical components and the like in, for example, optical films such as polarizing plates, phase difference plates, and lens films for displays, and in the production process of these optical components and the like. In particular, even when the antistatic surface protective film is used as an antistatic surface protective film for an optical film such as an LR polarizer or an AG-LR polarizer, which is treated with a silicone compound, a fluorine compound, or the like to prevent contamination of the surface, the amount of static electricity generated can be reduced when the antistatic surface protective film is peeled from an adherend after being temporarily attached to the adherend.
The antistatic surface protective film of the present invention has excellent antistatic performance without time degradation, and thus can improve the operability and yield of production process, and has great industrial utility value.

Claims (3)

1. An antistatic surface protective film formed by forming an adhesive layer on one surface of a base film made of a transparent resin, and bonding a release sheet to the surface of the adhesive layer,
The release sheet has a release agent layer formed from a resin composition containing a release agent mainly composed of dimethylpolysiloxane and an antistatic agent on one side of a base material,
The base material of the stripping sheet is a base material containing paper,
The antistatic surface protection film is a cut sheet-shaped surface protection film,
The antistatic surface protective film is picked up one by one from a bundle of the antistatic surface protective films in a state of being overlapped by a plurality of sheets, and after the release sheet is peeled off, it is attached to the optical member.
2. An optical film formed by laminating the antistatic surface protective film according to claim 1 in a state that the release sheet has been released.
3. An optical member formed by laminating the antistatic surface protective film according to claim 1 in a state that the release sheet has been released.
CN202410203244.3A 2015-10-28 2016-09-27 Antistatic surface protection film Pending CN117965109A (en)

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