CN117701167A - Surface protective film and optical member bonded with the same - Google Patents

Surface protective film and optical member bonded with the same Download PDF

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Publication number
CN117701167A
CN117701167A CN202311710417.2A CN202311710417A CN117701167A CN 117701167 A CN117701167 A CN 117701167A CN 202311710417 A CN202311710417 A CN 202311710417A CN 117701167 A CN117701167 A CN 117701167A
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CN
China
Prior art keywords
film
agent
adhesive layer
surface protective
protective film
Prior art date
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Pending
Application number
CN202311710417.2A
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Chinese (zh)
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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Publication of CN117701167A publication Critical patent/CN117701167A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • 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
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • 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
    • C09D5/20—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films
    • 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
    • C09D7/65—Additives macromolecular
    • 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
    • C09J7/201—Adhesives in the form of films or foils characterised by their carriers characterised by the release coating composition on the carrier layer
    • 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
    • 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
    • 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
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/04—Antistatic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2483/00—Presence of polysiloxane
    • C09J2483/005—Presence of polysiloxane in the release coating

Abstract

The invention provides a surface protection film which can be used for an optical film having concave-convex surface, has little pollution to an adherend, has no change of low pollution to the adherend with time, and has excellent anti-stripping electrostatic performance without time degradation, and an optical component using the surface protection film. The surface protection film (10) is formed by attaching a release film (5) having a release agent layer (4) to an adhesive 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 containing polydimethylsiloxane as a main component, an antistatic agent which does not react with the release agent, and an antistatic agent, the antistatic agent component is an ionic compound having a melting point of less than 30 ℃, the antistatic agent is polyether-modified silicone, and the antistatic agent component and the antistatic agent are transferred from the release agent layer (4) of the release film (5) to the surface of the adhesive layer (2), thereby reducing the peeling static voltage when the adhesive layer (2) is peeled from an adherend.

Description

Surface protective film and optical member bonded with the same
The present invention is a divisional application of chinese patent application having application number 201610886204.9, application date 2016, 10/11, and entitled "surface protective film and optical member to which the surface protective film is attached", and the present application claims priority from 2016/2/16 to japanese patent application 2016-027290.
Technical Field
The present invention relates to a 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, a surface protective film with little contamination to an adherend, a surface protective film having excellent anti-peeling electrostatic properties without deterioration over time, and an optical member using the surface protective film are provided.
Background
Conventionally, when manufacturing and transporting optical films such as polarizing plates, retardation plates, lens 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 film, so that fouling or 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 directly in a state where the surface protective film is bonded to the optical film, thereby improving the working efficiency.
In general, in the production process of an optical product, a surface protective film having an adhesive layer on one surface of a base film is used to prevent the adhesion of scratches or dirt. The surface protective film is bonded to the optical film via a slightly adhesive layer. 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, although the number of produced products is small, there has been a phenomenon in which circuit components such as a driving IC for controlling a display screen of the liquid crystal display panel are destroyed or alignment of liquid crystal molecules is damaged due to a peeling static voltage generated when a surface protective film attached to an optical film is peeled off and removed.
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. Recently, it has been demanded to set the stripping static voltage to be in the range of +0.7kV to-0.7 kV.
In addition, in recent years, with the spread of 3D displays (stereoscopic displays), a FPR (Film Patterned Retarder) film may be attached to the surface of an optical film such as a polarizer. 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 polarizing plate 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.
In some liquid crystal panel factories, the following methods are used as methods for evaluating the contamination of an adherend with a surface protective film: 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 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 which does not have a problem in terms of contamination of the surface of an adherend even in the result of evaluation by such a strict evaluation method.
In order to prevent occurrence of defects 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 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 for a surface protective sheet for an optical member made of a polymer containing a liquid ionic salt, and an adhesive sheet.
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: JP-A2008-069261
Disclosure of Invention
Technical problem to be solved by the invention
In patent documents 1 to 5, an antistatic agent is added to the inside of the adhesive layer. However, the thicker the adhesive layer or the longer the time elapsed after the adhesion to the adherend, the greater the amount of the antistatic agent transferred from the adhesive layer to the adherend relative to the adherend to which the surface protective film was adhered. If the amount of the antistatic agent transferred to the adherend increases, there is a possibility that the appearance quality of the optical film as the adherend decreases and the adhesiveness of the FPR film decreases when the FPR film is bonded.
In order to reduce the increase in the time period of the antistatic agent transferred from the adhesive layer to the adherend, another problem arises when the thickness of the adhesive layer is reduced. For example, when used in an optical film having irregularities on the surface of a polarizing plate or the like which has been subjected to antiglare treatment for antiglare purposes, the following problems are encountered: the adhesive layer is less likely to follow the irregularities on the surface of the optical film and to mix with bubbles, and the adhesive area between the optical film and the adhesive layer is reduced to reduce the adhesive force, so that the surface protective film floats or falls off when in use.
Therefore, there is a need for a surface protective film for an optical film which can be bonded to an optical film having irregularities on the surface, which has little contamination to an adherend, and which does not cause increased contamination to the adherend over time, and a surface protective film which can suppress the peeling static voltage at the time of 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 to reduce the increase in contamination with time, it is necessary to reduce the amount of antistatic agent components in the adhesive layer which are presumed to be responsible for contamination of the adherend. However, when the antistatic agent component in the adhesive layer is reduced, the peeling static voltage increases when the surface protective film is peeled from the adherend. Therefore, a method has been studied in which the peeling static 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, it has been found that when an adhesive composition containing no antistatic agent is applied and dried, and then laminated into an adhesive layer, an appropriate amount of an antistatic agent component is applied only to the surface of the adhesive layer, and the adhesive composition containing an antistatic agent is applied and dried on one surface of a base film, instead of forming an adhesive layer, the peeling static voltage at the time of peeling a surface protective film from an optical film as an adherend can be suppressed to a low level, and the present invention has been completed.
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 irregularities on the surface, has little contamination to an adherend, has low contamination to the adherend, does not change over time, and has excellent anti-peeling electrostatic properties which do not deteriorate over time, and an optical member using the surface protective film.
Technical means for solving the technical problems
In order to solve the above-described problems, the present invention is directed to a surface protective film of the present invention, in which an adhesive composition containing no antistatic agent is applied to one surface of a base film, and then the adhesive layer is dried and laminated, and then an appropriate amount of antistatic agent is applied to the surface of the adhesive layer, thereby suppressing contamination to an adherend and suppressing peeling static voltage at the time of peeling from an optical film as an adherend to a low level.
In order to solve the above-described 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 laminated on the adhesive layer, wherein the release film is formed by laminating a release agent layer on one surface of the 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 antistatic agent, the antistatic agent is an ionic compound having a melting point of less than 30 ℃, the antistatic agent is polyether-modified silicone, and the antistatic agent are transferred from the release agent layer of the release film to the surface of the adhesive layer, thereby reducing a peeling static voltage when the adhesive layer is peeled from an adherend.
The adhesive layer is preferably formed 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 component formed by bonding the surface protective film.
Effects of the invention
The surface protective film of the present invention has little contamination to an adherend, and the low contamination to the adherend does not change even with time. The surface protective film of the present invention may be used even in an optical film having irregularities on the surface of an AG polarizing plate or the like as an adherend. Further, according to the present invention, it is possible to provide a surface protective film having excellent anti-peeling electrostatic properties that does not deteriorate with time, which can suppress peeling electrostatic voltage generated when peeling from an optical film as an adherend, 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 protected with certainty, and therefore, improvement in productivity and improvement in yield can be achieved.
Drawings
Fig. 1 is a sectional view showing the concept of a surface protective film of the present invention;
FIG. 2 is a sectional view showing a state in which a release film is peeled from a 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 layer; 3 … resin film; 4 … stripper layer; 5 … release film; 7 … antistatic agent and antistatic auxiliary agent; 8 … adherend (optical member); 10 … surface protective film; 11 …, peeling off the surface protective film of the release film; 20 …, an optical member having a surface protective film attached thereto.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Fig. 1 is a cross-sectional view showing the concept of the surface protective film of the present invention. The surface protective film 10 has an adhesive layer 2 formed on the surface of one surface of a transparent base film 1. A release film 5 having a release agent layer 4 formed on the surface of the 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 composed of a resin having transparency and flexibility is used. Thus, the appearance of the optical member can be detected in a state in which the surface protective film is bonded to the optical member as an adherend. As the film made of the transparent resin for 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 composed of another 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 surface protective film 10 of the present invention is not particularly limited, but is preferably about 12 to 100 μm, for example, and more preferably about 20 to 50 μm, since it is easier to handle.
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 adhesion-facilitating treatment such as surface modification by corona discharge and application of 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 adheres to the surface of an adherend, can be easily peeled off after use, and is less likely to contaminate the adherend, and an acrylic adhesive obtained by crosslinking a (meth) acrylate copolymer is generally used in view of durability and the like after adhering to an optical film.
Examples of the (meth) acrylate copolymer include copolymers obtained by copolymerizing a main monomer such as N-butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, isononyl acrylate, and the like with a functional monomer such as acrylonitrile, vinyl acetate, methyl methacrylate, ethyl acrylate, acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate, glycidyl methacrylate, N-methylolmethacrylamide, and the like, and a polyoxyalkylene-containing monomer such as methoxypolyethylene glycol methacrylate. The (meth) acrylate copolymer may contain, as the main monomer, one or more monomers other than (meth) acrylate, and may contain, as the main monomer, one or more monomers other than (meth) acrylate. The other monomers than the main monomer may be selected from, but not particularly limited to, the above-mentioned comonomers, functional monomers, polyoxyalkylene-containing monomers, and the like.
As the curing agent added to the adhesive layer 2, a crosslinking agent that crosslinks the (meth) acrylate copolymer may be mentioned an isocyanate compound, an epoxy compound, a melamine compound, a metal chelate compound, or the like. Examples of the thickener include rosins, coumarone-indenes, terpenes, petroleum, phenols, and the like.
The thickness of the adhesive layer 2 used in the surface protective film 10 of the present invention is not particularly limited, but is preferably about 5 to 40 μm, and more preferably about 10 to 30 μm. In addition, since the handling property is excellent when the surface protective film is peeled from the adherend, the adhesive layer 2 having a slight adhesion, in which the peel strength (adhesion) of the surface protective film to the surface of the adherend is about 0.03 to 0.3N/25mm, is preferable. Further, since the release film 5 is excellent in handling property when peeled from the surface protective film 10, the peeling force when peeling the release film 5 from the adhesive layer 2 is preferably 0.2N/50mm or less, more preferably 0.14N/50mm or less.
The release film 5 used in the surface protective film 10 of the present invention is formed by laminating a release agent layer 4 on one surface of a resin film 3, and the release agent layer 4 contains a release agent containing polydimethylsiloxane as a main component, an antistatic agent that does not react with the release agent, and an antistatic agent. In the release film used in the surface protective film of the present invention, the antistatic agent component is preferably an ionic compound having a melting point of less than 30 ℃. The antistatic auxiliary agent is preferably polyether modified silicone.
The resin film 3 includes a polyester film, a polyamide film, a polyethylene film, a polypropylene film, a polyimide film, and the like, and is particularly preferably a polyester film because of its excellent transparency and low cost. The resin film may be a non-stretched film or a uniaxially or biaxially stretched film. The stretching ratio of the stretched film and the orientation angle in the axial direction formed by crystallization of the stretched film can 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 is more preferably about 16 to 50 μm because of easy handling.
Further, if necessary, the surface of the resin film 3 may be subjected to an adhesion-facilitating treatment such as surface modification by corona discharge and application of an anchor agent.
As the release agent containing polydimethylsiloxane as a main component constituting the release agent layer 4, known silicone release agents such as addition reaction type, condensation reaction type, cationic polymerization type, radical polymerization type and the like can be mentioned. 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 industries 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 listed on the market. 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.).
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 a release agent containing polydimethylsiloxane as a main component. In order to transfer the release agent layer 4 to the surface of the adhesive layer 2 and impart an antistatic effect to the adhesive layer 2, an antistatic agent that does not react with a release agent containing polydimethylsiloxane as a main component is preferable. Ionic compounds having a melting point of less than 30 ℃ are very suitable as such antistatic agents.
The ionic compound having a melting point of less than 30℃is an ionic compound having a cation and an anion, and examples of the cation include cyclic amidine ions such as imidazole ion, pyridine ion, ammonium ion, sulfonium ion, and phosphine ion. Further, as the anion, C may be mentioned n H 2n+1 COO - 、C n F 2n+1 COO - 、NO 3 - 、C n F 2n+1 SO 3 - 、(C n F 2n+1 SO 2 ) 2 N - 、(C n F 2n+1 SO 2 ) 3 C - 、PO 4 3- 、AlCl 4 - 、Al 2 Cl 7 - 、ClO 4 - 、BF 4 - 、PF 6 - 、AsF 6 - 、SbF 6 - Etc.
The amount of the antistatic agent to be added to the release agent containing polydimethylsiloxane as a main component varies depending on the type of the antistatic agent or the affinity with the release agent. The amount of the antistatic agent to be added may be set in consideration of the peeling static voltage expected when peeling the surface protective film from the adherend, the contamination property to the adherend, the adhesive property, and the like.
The antistatic auxiliary agent constituting the stripper layer 4 is used to improve antistatic properties of the surface of the adhesive layer. As such an antistatic auxiliary agent, polyether-modified silicone is suitable. The polyether chain in the polyether-modified silicone is composed of ethylene oxide, propylene oxide, or the like, and the molecular weight of the polyethylene oxide used for the side chain is selected to adjust the compatibility with the silicone release agent, the antistatic effect, and other physical properties.
Examples of the polyether-modified silicone products that are commercially available include KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-642 (manufactured by Xinyue chemical industries, ltd.), SH8400, SH8700, SF8410 (Dow Corning Toray Co., ltd.), TSF-4440, TSF-4441, TSF-4445, TSF-4446, TSF-4450 (manufactured by Momentive Performance Materials Co., ltd.), BYK-300, BYK-306, BYK-307, BYK-320, BYK-325, and BYK-330 (manufactured by BYK Co.).
The amount of the polyether-modified silicone to be added to the release agent containing polydimethylsiloxane as a main component varies depending on the type of the polyether-modified silicone and the degree of compatibility with the release agent, and can be set in consideration of a desired peeling static voltage, contamination to an adherend, adhesion characteristics, and the like when peeling the surface protective film from the adherend.
The method of mixing the stripping agent containing polydimethylsiloxane as a main component with the antistatic agent and the antistatic auxiliary agent is not particularly limited. Any of the following methods may be used: a method in which an antistatic agent and an antistatic auxiliary agent are added and mixed to a release agent containing polydimethylsiloxane as a main component, and then a catalyst for curing the release agent is added and mixed; a method in which a stripping agent containing polydimethylsiloxane as a main component is diluted in advance with an organic solvent, and then an antistatic agent, an antistatic auxiliary agent, and a catalyst for stripping agent curing are added and mixed; and a method in which a stripping agent containing polydimethylsiloxane as a main component is diluted in an organic solvent, a catalyst is added and mixed, and an antistatic agent and an antistatic auxiliary agent are added and mixed. Further, 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 as necessary.
The mixing ratio of the release agent mainly composed of polydimethylsiloxane, the antistatic agent and the antistatic agent is not particularly limited, but the total amount of the antistatic agent and the antistatic agent is preferably about 5 to 100 parts by solid content based on 100 parts by solid content of the release agent mainly composed of polydimethylsiloxane. If the total amount of the antistatic agent and the antistatic aid is less than 5 parts by weight based on 100 parts by weight of the solid content of the release agent containing polydimethylsiloxane as the main component, the transfer amount of the antistatic agent and the antistatic aid to the surface of the adhesive layer decreases, and it is difficult to exert the antistatic function of the adhesive. If the total amount of the antistatic agent and the antistatic aid 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 polydimethylsiloxane, the antistatic agent and the antistatic aid are also transferred onto the surface of the adhesive layer at the same time, 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 surface protective film 10 and the method of bonding the release film 5 according to the present invention can 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 film 5 is bonded; (2) A method of applying the resin composition for forming the adhesive layer 2 on the surface of the release film 5 and drying the same to form an adhesive layer, and then bonding the base film 1 to the film may be used by any method.
The method of forming the adhesive layer 2 on the surface of the base film 1 may be performed by a known method. Specifically, a known coating method such as reverse coating, doctor blade coating, gravure coating, nip extrusion coating, meyer rod coating, or air knife coating can be used.
In the same manner, the release agent layer 4 may be formed on the resin film 3 by a known method. Specifically, a known coating method such as gravure coating, meyer rod coating, or 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, particularly preferably +0.1kV to-0.1 kV. The surface potential can be adjusted by adding or subtracting the type, the amount, and the like of the antistatic agent and the antistatic auxiliary agent contained in the stripper layer.
Fig. 2 is a cross-sectional view showing a state in which the release film is peeled from the surface protective film of the present invention.
By peeling off the release film 5 from the surface protective film 10 shown in fig. 1, a part of the antistatic agent and antistatic auxiliary agent (reference numeral 7) contained in the release agent layer 4 of the release film 5 is transferred (attached) to the surface of the adhesive layer 2 of the surface protective film 10. Therefore, in fig. 2, the antistatic agent and antistatic auxiliary agent transferred on the surface of the adhesive layer 2 of the surface protection film 11 in which the release film is peeled off are indicated by the spots of reference numeral 7. By transferring the component 7 of the antistatic agent and the antistatic auxiliary agent from the release film 5 to the surface of the adhesive layer 2, the peeling static voltage when the adhesive layer 2 is peeled from the adherend is reduced compared to the adhesive layer 2 before transfer. The static peeling voltage at the time of peeling the adhesive layer from the adherend can be measured by a known method. For example, after the surface protective film is attached to an adherend such as a polarizing plate, the surface protective film is peeled at a peeling speed of 40m per minute by a high-speed peeling TESTER (manufactured by TESTER SANGYO CO,. LTD.) and the surface potential of the adherend surface is measured at 10ms by a surface potentiometer (manufactured by KEYENCE CORPORATION), and the maximum value of the absolute value of the surface potential at this time is taken as the peeling static voltage (kV).
In the surface protective film of the present invention, when the surface protective film 11 in the state of peeling off the peeling film shown in fig. 2 is attached to an adherend, an antistatic agent and an antistatic auxiliary agent transferred from the peeling agent layer onto the surface of the adhesive layer 2 come into contact with the surface of the adherend. Thus, the peeling static voltage when the 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 film 5 is peeled from the surface protective film 10 of the present invention to expose the adhesive layer 2, and is bonded to the optical member 8 as an adherend via the adhesive layer 2.
That is, fig. 3 shows an optical member 20 to which the surface protective film 11 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 which also serves as a phase difference plate, and an optical film such as 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, or 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.
According to the optical member of the present invention, when the surface protective film 11 is peeled off from the optical member (optical film) as an adherend, the peeling static voltage can be sufficiently reduced. Therefore, there is no need to damage circuit components such as the driving IC, TFT element, and gate line driving circuit, and the production efficiency in the manufacturing process of the liquid crystal display panel can be improved, and the reliability of the manufacturing process can be maintained.
Examples
The invention will be further illustrated with reference to examples.
Example 1
(production of surface protective film)
5 parts by weight of addition reaction type silicone (Dow Corning Toray Co., ltd.; trade name: SRX-345), 7.5 parts by weight of tri-n-butylmethylammonium bis (trifluoromethylsulfonyl) imide (manufactured by 3M company, FC-4400) as an ionic compound having a melting point of 27.5 ℃, 0.3 parts by weight of polyether-modified silicone (Dow Corning Toray Co., ltd.; trade name: SH 8400), 95 parts by weight of a mixed solvent of toluene and ethyl acetate 1:1, 0.05 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 the stripper layer of example 1. The coating material for forming the release agent layer of example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm using a meyer rod, and the film was dried to a thickness of 0.2 μm after drying, and dried for 1 minute using a hot air circulation oven at 120 ℃. On the other hand, the adhesive composition of example 1 was prepared by adding and mixing 1.2 parts by weight of an HDI-based curing agent (manufactured by TOSOH CORPORATION, trade name: CORONATE (registered trademark) HX) to 100 parts by weight of an adhesive polymer solution (ethyl acetate solution having a solid content of 30%) obtained by dissolving 30 parts by weight of an acrylic ester copolymer obtained by copolymerizing 2-ethylhexyl acrylate and 2-hydroxyethyl acrylate at a weight ratio of 96:4. In addition, "HDI-type" means "hexamethylene diisocyanate-type".
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 circulation oven at 100℃to form an adhesive layer. Then, a release agent layer (silicone-treated surface) of the release film of example 1 prepared as described above was bonded to the surface of the adhesive layer. The resulting adhesive film was kept at 40℃for 5 days, and the adhesive layer was cured to obtain a surface protective film of example 1.
Comparative example 1
5 parts by weight of addition reaction type silicone (Dow Corning Toray co., ltd., trade name: SRX-345), 95 parts by weight of toluene, a mixed solvent of ethyl acetate 1:1, and 0.05 part by weight of a platinum catalyst (Dow Corning Toray co., ltd., trade name: SRX-212) were mixed and stirred to prepare a coating material for forming a stripper layer of comparative example 1. The coating material for forming the release agent layer of comparative example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm using a meyer rod so that the thickness after drying was 0.2 μm, and dried using a hot air circulation oven at 120 ℃ for 1 minute, to obtain a release film of comparative example 1. On the other hand, 3 parts by weight of tri-n-butylmethylammonium bis (trifluoromethanesulfonyl) imide (manufactured by 3M company, FC-4400) as an ionic compound having a melting point of 27.5℃and 1.2 parts by weight of an HDI-based curing agent (manufactured by TOSOH CORPORATION, trade name: CORONATE (registered trademark) HX) were added to 100 parts by weight of the adhesive polymer solution (30% ethyl acetate solution) of example 1, and mixed, 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℃to form an adhesive layer. Then, the release agent layer (silicone-treated surface) of the release film of comparative example 1 prepared above was bonded to the surface of the adhesive layer. The resulting adhesive film was kept at 40℃for 5 days, and the adhesive layer was cured to obtain 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 tri-n-butylmethylammonium bis (trifluoromethanesulfonyl) imide was not contained in the adhesive layer as an ionic compound having a melting point of 27.5 ℃.
Comparative example 3
A surface protective film of comparative example 3 was obtained in the same manner as in example 1, except that the polyether-modified silicone was not contained in the release agent layer.
Example 2
The surface protective film of example 2 was obtained in the same manner as in example 1, except that 100 parts by weight of an adhesive polymer solution (ethyl acetate solution having a solid content of 30%) obtained by dissolving 30 parts by weight of an acrylic ester copolymer obtained by copolymerizing 2-ethylhexyl acrylate, butyl acrylate and 2-hydroxyethyl acrylate at a weight ratio of 60:36:4 was used in place of the adhesive composition of example 1, and 1.2 parts by weight of an HDI-based curing agent (manufactured by TOSOH CORPORATION, trade name: CORONATE (registered trademark) HX) was added and mixed.
Example 3
The surface protective film of example 3 was obtained in the same manner as in example 1, except that 100 parts by weight of an adhesive polymer solution (ethyl acetate solution having a solid content of 30%) obtained by dissolving 30 parts by weight of a (meth) acrylate copolymer obtained by copolymerizing 2-ethylhexyl acrylate, methoxypolyethylene glycol (400) methacrylate, and 2-hydroxyethyl acrylate at a weight ratio of 86:10:4 was used instead of the adhesive composition of example 1, and 1.2 parts by weight of an HDI-based curing agent (manufactured by TOSOH CORPORATION, trade name: cor ate (registered trademark) HX) was added and mixed.
The method and results of the evaluation test are shown below.
< method for measuring peeling force of Release film >
Samples of the surface protective film were sheared to 50mm wide and 150mm long. The strength at the time of peeling the release film was measured in the direction of 180℃at a peeling speed 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 film was used.
< method for measuring adhesion of surface protective film >
An antiglare low reflection treatment polarizer (AG-LR polarizer) 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 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 a peeling force (N/25 mm).
< method for measuring peeling static Voltage of surface protective film >
An antiglare low reflection treatment polarizer (AG-LR polarizer) 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 for one day in a test environment of 23℃X 50% RH. Thereafter, the surface protective film was peeled at a peeling rate of 40m per minute using a high-speed peeling TESTER (manufactured by TESTER SANGYO CO,. LTD. Times.) while measuring the surface potential of the surface of the polarizing plate every 10ms using a surface potentiometer (manufactured by KEYENCE CORPORATION), and the maximum value of the absolute value of the surface potential at this time was taken as the peeling static voltage (kV).
< method for determining surface contamination of surface protective film >
An antiglare low reflection treatment polarizer (AG-LR polarizer) 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 then stored for 3 days and 30 days under a test environment of 23℃X 50% RH. Then, the surface protective film was peeled off, and the surface of the polarizing plate was visually inspected for contamination. As a criterion for 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 obtained surface protective films of examples 1 to 3 and comparative examples 1 to 3 are shown in tables 1 to 2. "2EHA" is 2-ethylhexyl acrylate, "HEA" is 2-hydroxyethyl acrylate, "BA" is butyl acrylate, "#400G" is methoxypolyethylene glycol (400) methacrylate, and "FC4400" is tri-n-butylmethylammonium bis (trifluoromethylsulfonyl) imide. In tables 1 and 2, the composition of the adhesive layer is expressed in 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 component) to FC4400 was 30 parts by weight: 0.3 parts by weight = 100 parts by weight: 1.0 parts by weight.
TABLE 1
TABLE 2
From the measurement results shown in tables 1 and 2, the following conclusion can be obtained.
The surface protective films of examples 1 to 3 of the present invention had moderate adhesion, no contamination to the surface of the adherend, and low peeling static electricity when the surface protective films were peeled from the adherend.
On the other hand, the surface protective film of comparative example 1 in which the antistatic agent was contained in the adhesive layer was excellent in that the peeling static electricity was low when the surface protective film was peeled from the adherend, but the contamination of the adherend after peeling was increased.
In the surface protective film of comparative example 2 in which the antistatic agent was not contained in both the adhesive layer of the surface protective film and the release agent layer of the release film, the contamination to the adherend was good, but the peeling electrostatic pressure at the time of peeling the surface protective film from the adherend was increased.
That is, in the surface protective film of comparative example 1 in which the antistatic agent is contained in the adhesive layer of the surface protective film, and in the surface protective film of comparative example 2 in which the antistatic agent is not contained in both the adhesive layer of the surface protective film and the release agent layer of the release film, it is difficult to reduce both the peeling static voltage and the contamination to the adherend.
On the other hand, in the surface protective films of examples 1 to 3 in which the antistatic agent and the antistatic auxiliary agent were transferred onto the surface of the adhesive layer only after the antistatic agent and the antistatic auxiliary agent were contained in the release agent layer of the release film, the release film had a remarkable effect of reducing the release static voltage by adding a small amount of the antistatic auxiliary agent, and therefore, no contamination of the adherend was caused, and the anti-release static performance was also good.
In addition, the surface protective film of comparative example 3, in which only the antistatic agent was contained in the release agent layer and no antistatic auxiliary agent was contained, was free from contamination of the adherend and also had good anti-peeling electrostatic properties. However, the stripping electrostatic pressure was increased as compared with the surface protective films of examples 1 to 3 in which the antistatic agent and the antistatic auxiliary agent were contained in the stripping agent layer.
Industrial applicability
The surface protective film of the present invention can be bonded to the surface of an optical member or the like to protect the surface in a production process of the optical film such as a polarizing plate, a retardation plate, a lens film, or other various optical members. In addition, the surface protective film of the present invention can suppress the amount of static electricity generated when the surface protective film is peeled from an adherend, and is less in the change with time of the peeling resistance and contamination of the adherend, and can improve the yield of the production process, and is industrially valuable.

Claims (3)

1. 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 adhesive layer is formed by crosslinking an adhesive composition containing a (meth) acrylate copolymer and a crosslinking agent,
the (meth) acrylate copolymer is a copolymer obtained by copolymerizing only one or more main monomers selected from the group consisting of N-butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate and isononyl acrylate with one or more functional monomers selected from the group consisting of acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate, glycidyl methacrylate and N-methylolmethacrylamide,
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 antistatic auxiliary agent,
the antistatic agent comprises ionic compounds with melting points less than 30 ℃, the antistatic auxiliary agent is polyether modified silicone,
the antistatic agent component and the antistatic auxiliary agent are transferred from the stripper layer of the release film to the surface of the adhesive layer,
reducing the peeling static voltage when the adhesive layer is peeled from the adherend,
the surface potential when the adhesive layer is peeled from the optical film as an adherend is +0.1kV to-0.1 kV.
2. The surface protective film according to claim 1, wherein a peeling force at the time of peeling the peeling film from the adhesive layer is 0.2N/50mm or less.
3. An optical member comprising the surface protective film according to claim 1 or 2.
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Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS553460A (en) * 1978-06-26 1980-01-11 Toray Silicone Co Ltd Composition for forming release film
JP2003292874A (en) * 2002-02-04 2003-10-15 Asahi Kasei Corp Releasable material and releasing agent
JP2004274199A (en) * 2003-03-06 2004-09-30 Tetsuya Mori Telephone with security function
JP2004287199A (en) * 2003-03-24 2004-10-14 Sun A Kaken Co Ltd Surface protection film
JP4279118B2 (en) 2003-10-30 2009-06-17 藤森工業株式会社 Surface protective film and optical component on which it is adhered
JP3912686B2 (en) 2004-04-19 2007-05-09 日東電工株式会社 Adhesive composition, adhesive layer, and surface protective film
JP2005314476A (en) 2004-04-27 2005-11-10 Nitto Denko Corp Adhesive composition, adhesive sheet and surface-protective film
JP4799900B2 (en) 2004-10-28 2011-10-26 日東電工株式会社 Adhesive composition, adhesive sheet and surface protective film
JP4942171B2 (en) 2006-09-14 2012-05-30 綜研化学株式会社 Adhesive composition and adhesive sheet
JP5544800B2 (en) * 2009-09-17 2014-07-09 サイデン化学株式会社 Surface protection film
JP5587645B2 (en) * 2010-03-18 2014-09-10 リンテック株式会社 Optical pressure-sensitive adhesive, optical pressure-sensitive adhesive sheet, and optical member with a pressure-sensitive adhesive layer
JP5785798B2 (en) * 2010-06-30 2015-09-30 富士フイルム株式会社 Method for producing antistatic laminate
JP5749076B2 (en) * 2011-05-19 2015-07-15 藤森工業株式会社 Surface protective film and optical component to which it is attached
JP5879160B2 (en) * 2012-03-06 2016-03-08 藤森工業株式会社 Adhesive composition and surface protective film
JP5901399B2 (en) * 2012-04-05 2016-04-06 藤森工業株式会社 Adhesive composition and surface protective film
JP6133109B2 (en) * 2013-04-09 2017-05-24 日東電工株式会社 Adhesive composition and adhesive sheet
JP5863722B2 (en) * 2013-07-25 2016-02-17 藤森工業株式会社 Surface protective film and optical component on which it is bonded
JP5852998B2 (en) * 2013-07-29 2016-02-09 藤森工業株式会社 Surface protective film and optical component on which it is bonded
JP5882266B2 (en) * 2013-08-20 2016-03-09 藤森工業株式会社 Surface protective film and optical component on which it is bonded
JP5952242B2 (en) * 2013-09-04 2016-07-13 藤森工業株式会社 Adhesive composition, adhesive film and surface protective film
JP5963788B2 (en) * 2014-01-10 2016-08-03 藤森工業株式会社 Method for producing antistatic surface protective film, and antistatic surface protective film
JP6147223B2 (en) * 2014-05-15 2017-06-14 藤森工業株式会社 Method for producing antistatic surface protective film, and antistatic surface protective film
JP6327704B2 (en) * 2014-05-20 2018-05-23 日東電工株式会社 Method for producing surface protective film

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KR20170096568A (en) 2017-08-24
JP2017144608A (en) 2017-08-24
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TWI802530B (en) 2023-05-21
KR102050235B1 (en) 2019-11-29

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