CN106010323B - Antistatic surface protective film and optical component with the same - Google Patents

Antistatic surface protective film and optical component with the same Download PDF

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Publication number
CN106010323B
CN106010323B CN201610076854.7A CN201610076854A CN106010323B CN 106010323 B CN106010323 B CN 106010323B CN 201610076854 A CN201610076854 A CN 201610076854A CN 106010323 B CN106010323 B CN 106010323B
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film
antistatic
protective film
surface protective
antistatic agent
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CN106010323A (en
Inventor
小林弘幸
新见洋人
春日充
铃木千惠
五十嵐智美
木俣绘美子
林益史
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Fujimori Kogyo Co Ltd
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Fujimori Kogyo Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/201—Adhesives in the form of films or foils characterised by their carriers characterised by the release coating composition on the carrier layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • 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
    • C09J7/20—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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C09J9/02—Electrically-conducting adhesives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements
    • 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
    • C09J2301/314—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive layer and/or the carrier being conductive
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive 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
    • 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
    • C09J2475/00—Presence of polyurethane

Abstract

The invention provides an antistatic surface protective film and an optical member attached with the protective film, wherein the protective film is difficult to generate foreign matters (micelle) caused by an adhesive even in cutting, has good affinity (wettability) even for an optical film with concave and convex surface as an adherend, has little pollution to the adherend, has low pollution performance to the adherend and does not change even after a long time, does not deteriorate with time, and has excellent stripping antistatic performance. The antistatic surface protection film (10) is formed by sequentially laminating a polyurethane adhesive layer (2) without an antistatic agent, an antistatic agent layer (3) and a stripping film (4) after stripping treatment on one surface of a base material film (1) composed of resin with transparency.

Description

Antistatic surface protective film and optical component with the same
Technical Field
The present invention relates to a surface protective film to be bonded to a surface of an optical member (hereinafter, also referred to as an optical film) such as a polarizing plate, a retardation plate, or a lens film for a display. More specifically, the present invention provides an antistatic surface protective film which is less likely to generate foreign matter (lumps) due to an adhesive even when cut, has good affinity (wettability) for an optical film having irregularities on the surface, causes little contamination to an adherend, does not change in low contamination to the adherend over time, does not deteriorate over time, and has excellent peeling antistatic performance, and an optical member to which the protective film is bonded.
Background
When optical films such as polarizing plates, retardation plates, lens films for displays, antireflection films, hard coat films, transparent conductive films for touch panels, and the like, and optical products such as displays using these films are manufactured and transported, a surface protective film is bonded to the surface of the optical film, and contamination or damage of the surface in a subsequent step can be prevented. In the visual inspection of the optical film of the product, in order to save the procedure of peeling off the surface protective film and bonding again and to improve the work efficiency, the surface protective film may be directly bonded to the optical film.
Conventionally, in the production process of optical products, a surface protective film having an adhesive layer provided on one surface of a base film is generally used in order to prevent scratches and dirt from adhering thereto. The surface protective film is bonded to the optical film via an adhesive layer having a weak adhesive force. The reason why the adhesive layer has a weak adhesive force is to enable easy peeling when a used surface protective film is peeled off from the surface of an optical film and to prevent the adhesive from adhering to and remaining on the optical film as an adherend product (so-called prevention of adhesive residue).
An acrylic adhesive is widely used as an adhesive having a weak adhesive strength, but when an optical film is cut to a predetermined size corresponding to the size of a display, the adhesive is torn by a cutting blade, and thus, a problem arises that small pieces of foreign matter (also referred to as a "micelle") are easily generated. If the foreign matter is generated, there is a problem that the process is contaminated or a pressure mark is generated on the optical film. Therefore, there is a demand for a surface protective film that generates less foreign matter when an optical film to which the surface protective film is bonded is slit or cut. Further, there is a demand for a surface protective film which has good affinity (wettability) even for an optical film having irregularities on the surface, such as a prism sheet or an antiglare polarizer, and which is less likely to allow air bubbles to enter when the surface protective film is bonded to the optical film.
Therefore, a surface protective film using a polyurethane adhesive is used as a surface protective film which is desired to be less likely to generate a micelle at the time of slitting or cutting and to have good affinity for various optical films.
In recent years, in the production process of a liquid crystal display panel, although the number of produced products is small, the following phenomena occur: the phenomenon of damage to circuit components such as a driver IC for controlling a display screen of a liquid crystal display panel or the phenomenon of damage to the orientation of liquid crystal molecules occurs due to a peeling electrostatic voltage generated when a surface protective film bonded to an optical film is peeled off and removed.
In addition, in order to reduce power consumption of the liquid crystal display panel, the driving voltage of the liquid crystal material is lowered, and the breakdown voltage of the driver IC is also lowered. Recently, the peeling electrostatic voltage is required to be in the range of +0.7kV to-0.7 kV.
In order to prevent a problem caused by a high peeling static voltage when peeling a surface protective film from an optical film as an adherend, a surface protective film using an antistatic agent-containing pressure-sensitive adhesive layer for suppressing the peeling static voltage at a low level has been proposed.
For example, patent document 1 discloses an antistatic adhesive comprising a polyurethane having an alkylene oxide (alkylene oxide) chain, an ionic compound, and a 3-functional isocyanate compound. Patent document 2 discloses a polyurethane binder composition for a surface protective film, which is characterized by containing at least one salt of an alkali metal salt or an alkaline earth metal salt of a superacid. Further, patent document 3 discloses an adhesive composition comprising an ionic liquid containing a fluorinated organic anion and a polyurethane having a number average molecular weight of 5,000 or more, and a surface protective film using the adhesive composition.
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent application publication No. 2005-154491
Patent document 2: japanese unexamined patent publication No. 2006-182794
Patent document 3: japanese unexamined patent publication No. 2007 & 277484
Disclosure of Invention
Technical problem to be solved by the invention
In the patent documents 1 to 3, an antistatic agent is added to the inside of the adhesive layer. However, as the thickness of the pressure-sensitive adhesive layer becomes thicker or as time passes after the pressure-sensitive adhesive layer is bonded to an adherend, the amount of transfer of the antistatic agent from the pressure-sensitive adhesive layer to the adherend may increase with respect to the adherend to which the surface protective film is bonded. When the amount of the antistatic agent transferred to the adherend increases, the appearance quality of the optical film as the adherend may deteriorate, or the adhesive properties of the surface protective film may change with time.
In order to reduce the change with time of the antistatic agent transferred from the adhesive layer to the adherend, another problem occurs when the thickness of the adhesive is reduced. For example, there are problems as follows: in the case of an optical film having irregularities on the surface, such as an antiglare polarizing plate, used for antiglare purposes, the adhesive cannot follow the irregularities on the surface of the optical film and bubbles are mixed; the bonding force is reduced by the reduction of the bonding area between the optical film and the adhesive, and the surface protective film is lifted and peeled off during use.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a surface protective film which is less likely to generate foreign matter (lumps) due to an adhesive even when cut, has good affinity (wettability) for an optical film having irregularities on the surface thereof as an adherend, is less likely to stain the adherend, has low staining properties to the adherend unchanged over a long period of time, is not deteriorated with time, and has excellent peeling antistatic properties, and an optical member to which the protective film is bonded.
Means for solving the problems
The present inventors have conducted earnest studies to solve the above-mentioned problems.
First, in order to reduce contamination to an adherend and change in antistatic performance with time, it is necessary to reduce the amount of an antistatic agent to be added, which is presumed to cause contamination of the adherend. However, when the amount of the antistatic agent added is reduced, the peeling electrostatic voltage at the time of peeling the surface protective film from the adherend increases. Then, the present inventors have studied a method for suppressing the peeling static voltage at the time of peeling the surface protective film from the adherend to be low without increasing the absolute amount of the added amount of the antistatic agent. As a result, it was found that: the present inventors have found that a release static voltage at the time of releasing a surface protective film from an optical film as an adherend can be suppressed to be low by applying a component of an antistatic agent in an appropriate amount to the surface of an adhesive layer after the adhesive layer is laminated by coating and drying the adhesive composition, instead of adding and mixing an antistatic agent to the adhesive composition to form the adhesive layer, and have completed the present invention.
That is, in order to solve the above-mentioned problems, the present invention provides an antistatic surface protective film, which is characterized in that a polyurethane adhesive layer containing no antistatic agent, an antistatic agent layer, and a release film subjected to a release treatment are sequentially laminated on one surface of a base film made of a transparent resin.
Further, the antistatic agent layer preferably contains an ionic compound.
Further, the antistatic agent layer preferably contains an ionic compound having an alkali metal as a cation.
In addition, the thickness of the antistatic agent layer is preferably 0.01 to 0.3 μm.
The present invention also provides an optical member obtained by bonding the antistatic surface protective film.
Effects of the invention
The present invention can provide a surface protective film which is less likely to generate foreign matter (lumps) due to an adhesive even when cut, has good affinity (wettability) for an optical film having irregularities on the surface thereof as an adherend, is less likely to stain the adherend, has low staining properties to the adherend over a long period of time, is not likely to deteriorate with time, and has excellent peeling antistatic properties, and an optical member to which the surface protective film is bonded.
Further, according to the surface protective film of the present invention, since the surface of the optical film can be reliably protected, the occurrence of defective products in the optical component production process can be suppressed, and productivity and yield can be improved.
Drawings
FIG. 1 is a conceptual sectional view of an antistatic surface protective film according to the present invention;
FIG. 2 is a sectional view showing a state where a release film is peeled off from the antistatic surface protective film of the present invention;
fig. 3 is a sectional view showing an example of attaching the antistatic surface protective film of the present invention to an optical member.
Description of the reference numerals
1. The antistatic optical member comprises a base material film, 2 adhesive layers, 3 antistatic agent layers, 4 stripping films, 5 optical members, 10 antistatic surface protective films, 11 antistatic surface protective films stripped from the stripping films, and 20 optical members attached with the antistatic surface protective films.
Detailed Description
Hereinafter, the present invention will be described in detail based on embodiments.
Fig. 1 is a conceptual sectional view of an antistatic surface protective film of the present invention. The antistatic surface protection film 10 has an adhesive layer 2 containing no antistatic agent formed on one surface of a transparent base film 1. An antistatic agent layer 3 containing an antistatic agent material is formed on the surface of the pressure-sensitive adhesive layer 2, and a release film 4 subjected to a release treatment is further bonded to the surface of the antistatic agent layer 3.
As the base film 1 used for the antistatic surface protection film 10 of the present invention, a base film made of a transparent and flexible resin is used. In this way, the optical member can be subjected to appearance inspection in a state where the antistatic surface protective film is bonded to the optical member as an adherend. As the transparent resin film used as the base film 1, polyester films such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, and polybutylene terephthalate are suitably used. In addition to the polyester film, a film made of another resin may be used as long as it has a required strength and optical characteristics (optical characteristics). The substrate film 1 may be a non-stretched film or a uniaxially or biaxially stretched film. Further, the stretch ratio of the stretched film 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 protection film 10 of the present invention is not particularly limited, and is preferably about 12 to 100 μm, for example. Further, the thickness of the base film 1 is preferably about 20 to 50 μm, because handling is easy.
Further, as necessary, an antifouling layer for preventing surface fouling, an antistatic layer, a hard coat layer for preventing scratches, and the like may be provided on the opposite side surface of the base material film 1 from the surface on which the adhesive layer 2 is formed. Further, an easy adhesion treatment such as surface modification by corona discharge or coating with an anchor coating agent may be applied to the surface of the base film 1.
The pressure-sensitive adhesive layer 2 used in the antistatic surface protection film 10 of the present invention may be any pressure-sensitive adhesive that can be easily peeled off from an adherend after protecting the adherend on the surface of the adherend and that is less likely to contaminate the adherend. In addition, it is preferable to form the pressure-sensitive adhesive layer using a polyurethane pressure-sensitive adhesive composition from the viewpoint of less generation of a micelle during cutting and good wettability to an adherend such as an optical film.
The polyurethane binder may be selected from polyurethane resins composed of a polyol component and a polyisocyanate component in consideration of adhesiveness, wettability, staining of an adherend, and the like, and the polyol component and the polyisocyanate component are not particularly limited. The polyurethane resin may be used alone or in combination of 2 or more.
Examples of the polyol component include polyester polyols, polyether polyols, polycaprolactone polyols, polycarbonate polyols, and castor oil polyols. These polyol components may be used alone or in combination of 2 or more.
As the polyisocyanate component, aliphatic polyisocyanate, alicyclic polyisocyanate, aromatic polyisocyanate, polymer of diisocyanate, and the like can be used. These isocyanate components may be used alone or in combination of 2 or more.
Commercially available polyurethane adhesives include Cyabine (サイアバイン) (registered trademark) SH-101, SH-101M, SP-205, SP-220(Toyo-chem Co., Ltd.), ARACOAT (registered trademark) FT100, FT200 (Kawakawa chemical industry Co., Ltd.), UN1175 and UN1176 (Kawakawa chemical industry Co., Ltd.). The adhesive layer may be formed by crosslinking or curing a polyurethane adhesive.
The thickness of the adhesive layer 2 used in the antistatic surface protection film 10 of the present invention is not particularly limited, and is, for example, preferably about 5 to 40 μm, and more preferably about 10 to 30 μm.
The method for forming the adhesive layer 2 on the surface of the base film 1 may be performed by a known method, and specifically, a known coating method such as a reverse coating method, a comma knife coating method (comacoating), a gravure coating method, a slit extrusion coating method, a meyer rod coating method, or an air knife coating method may be used.
The antistatic agent-containing material used for the antistatic surface protection film 10 of the present invention to form the antistatic agent layer 3 includes an antistatic agent monomer, a mixture of an antistatic agent and various resins, and the like. As antistatic agents, ionic compounds are suitable. Examples of the resin used in the mixture of the antistatic agent and various resins include polyester resins, polyamide resins, polyurethane resins, polyolefin resins, polyvinyl butyral resins, polyvinyl alcohol resins, polyvinyl acetate resins, cellulose resins, silicone resins, and fluorine-containing resins.
The ionic compound is an ionic compound having a cation and an anion, and examples of the cation include an organic cation or an inorganic cation, for example, an alkali metal cation, a pyridinium cation, an imidazolium cation, a pyrimidinium cation, a pyrazolium cation, a pyrrolidinium cation, an ammonium cation, and other nitrogen-containing cations, phosphonium cations, and sulfonium cations. The nitrogen-containing onium cation may have an organic group or a substituent such as an alkyl group. Preferred examples of the quaternary nitrogen-containing onium cation include quaternary pyridinium cations such as 1-alkylpyridinium (the carbon atom at the 2-6-position may have a substituent or may not be substituted), quaternary imidazolium cations such as 1, 3-dialkylimidazolium (the carbon atom at the 2-4-5-position may have a substituent or may not be substituted), quaternary pyrimidinium cations such as N-alkylpyridinium (the carbon atom at the 2-and 4-6-positions may have a substituent or may not be substituted), quaternary thiazolium cations such as 1, 2-dialkylthiazolium (the carbon atom at the 3-5-position may have a substituent or may not be substituted), quaternary pyrrolidinium cations such as 1, 1-dialkylpyrrolidinium (the carbon atom at the 2-5-position may have a substituent or may not be substituted), and quaternary ammonium cations such as tetraalkylammonium. Examples of the phosphonium cation include organic group-containing phosphonium cations such as tetraalkylphosphonium. Examples of the sulfonium cation include sulfonium cations having an organic group such as trialkylsulfonium.
Furthermore, as the anion, there may be mentioned an organic anion or an inorganic anion, for example CnH2n+1COO-、CnF2n+ 1COO-、NO3 -、CnF2n+1SO3 -、(CnF2n+1SO2)2N-、(CnF2n+1SO2)3C-、RC6H4SO3 -、PO4 3-、AlCl4 -、Al2Cl7 -、ClO4 -、BF4 -、PF6 -、AsF6 -、SbF6 -、SCN-And the like. These ionic compounds may be used alone, or 2 or more of them may be used in combination. For stabilization of the ionic substance, a compound having a polyoxyalkylene structure may be added. In the above formula, the subscript n is an integer of 0 or more. When n is 0, it corresponds to HCOO-、(FSO2)2N-And the like.
Among these, an ionic compound (alkali metal salt) having an alkali metal cation as a cation is suitable. Examples of the alkali metal salt include metal salts of lithium, sodium, and potassium. Specifically, for example, Li can be suitably used+、Na+、K+Cation of composition with Cl-、Br-、I-、BF4 -、PF6 -、SCN-、ClO4 -、CF3SO3 -、(FSO2)2N-、(CF3SO2)2N-、(C2F5SO2)2N-、(CF3SO2)3C-A metal salt consisting of a constituent anion. Among them, LiBr, LiI and LiBF are particularly preferably used4、LiPF6、LiSCN、LiClO4、LiCF3SO3、Li(FSO2)2N、Li(CF3SO2)2N、Li(C2F5SO2)2N、Li(CF3SO2)3C, lithium salts. These alkali metal salts may be used alone, or 2 or more of them may be used in combination. For stabilization of the ionic substance, a compound having a polyoxyalkylene structure may be added.
The thickness of the coating film after drying the antistatic agent layer 3 may be determined in consideration of the kind of the antistatic agent, the antistatic property thereof, and the adherend staining property, and is preferably 0.3 μm or less. When the thickness of the antistatic agent layer 3 exceeds 0.3 μm, it is not preferable because the components of the adhesive composition are less likely to appear at the interface between the surface protective film and the adherend from between the resins forming the antistatic agent layer when the surface protective film is adhered to the adherend, and the adhesive force of the adhesive layer 2 does not reach a predetermined value. The thickness of the antistatic agent layer 3 is, for example, 0.01 to 0.3. mu.m.
In view of excellent workability when peeling the antistatic surface protection film 10 (specifically, the antistatic surface protection film 11 from which the release film shown in fig. 2 is peeled) from an adherend, the peeling strength (adhesive strength) when peeling the antistatic surface protection film 10 from the surface of the adherend is preferably a weak adhesive strength of about 0.03 to 0.3N/25 mm.
In addition, in view of excellent workability when peeling the release film 4 from the antistatic surface protection film 10, the peeling force when peeling the release film 4 from the antistatic agent layer 3 is preferably 0.005 to 0.3N/50mm when measured at a peeling speed of 0.3 m/min and a peeling angle of 180 °.
In the antistatic surface protective film 10 of the present invention, a method for forming the antistatic agent layer 3 on the surface of the adhesive layer 2 is not particularly limited. For example, the following methods can be cited: (1) a method in which the antistatic agent-containing material is contained in the release agent layer of the release film 4 and is transferred to the adhesive layer 2 when the release film 4 is adhered to the adhesive layer 2; (2) a method of printing the antistatic agent-containing material on the surface of the adhesive layer 2; (3) a method of applying the antistatic agent-containing material to the surface of the adhesive layer 2, and the like. The antistatic agent-containing material may be printed or coated uniformly or in a specific pattern. The adhesive strength of the adhesive layer to the adherend of the antistatic surface protective film may be determined in consideration of the adhesive strength and the like. The method for printing or coating the antistatic agent-containing material can be carried out by a known method.
The resin used in the release film 4 of the antistatic surface protective film 10 of the present invention shown in fig. 1 is not particularly limited. Examples of the release film 4 include a release film obtained by treating one surface of a resin film such as a polyester film, a polyamide film, a polyethylene film, a polypropylene film, or a polyimide film with a release agent such as a silicone-based release agent, a long-chain alkyl group-containing resin, or a fluorine-containing resin, and a release film obtained by forming a release resin such as a polyethylene resin, a polypropylene resin, a polymethylpentene resin, or a fluorine-containing resin into a film.
The thickness of the release film is not particularly limited, but is preferably about 12 to 100 μm, and more preferably about 20 to 50 μm, because handling is easy.
Fig. 2 is a sectional view showing a state where a release film is peeled off from the antistatic surface protective film of the present invention. In the antistatic surface protection film 11 shown in fig. 2 from which the release film is peeled off, the antistatic agent layer 3 is provided on the surface of the adhesive layer 2.
Fig. 3 is a sectional view showing an example in which the antistatic surface protective film of the present invention is bonded to an optical member.
The antistatic surface protection film 10 of the present invention is bonded to an optical member 5 as an adherend via an antistatic agent layer 3 in a state where a release film 4 subjected to a release treatment is peeled off and the antistatic agent layer 3 is exposed (antistatic surface protection film 11 of fig. 2).
That is, fig. 3 shows the optical member 20 to which the antistatic surface protection film 11 in a state where the release film 4 is peeled off from the antistatic surface protection film 10 of the present invention is bonded. Examples of the optical member include optical films such as a polarizing plate, a retardation plate, a lens film, a polarizing plate serving as a retardation plate, and a polarizing plate serving as a lens film. These optical members are used as components of liquid crystal display devices such as liquid crystal display panels, various measuring instruments, optical devices, and the like. Examples of the optical member include optical films such as antireflection films, hard coat films, and transparent conductive films for touch panels. In particular, the antistatic surface protective film can be suitably used as an antistatic surface protective film to be attached to a surface subjected to an anti-contamination treatment, which is an optical film such as a low reflection treatment polarizing plate (LR polarizing plate) or an antiglare low reflection treatment polarizing plate (AG-LR polarizing plate) having a surface subjected to an anti-contamination treatment with an organic silicon compound, a fluorine compound or the like.
When the antistatic surface protection film 11 in a state where the release film 4 is peeled off from the antistatic surface protection film 10 of the present invention is peeled off and removed from an optical member (optical film) as an adherend, the peeling static voltage can be sufficiently suppressed to be low. Therefore, there is no fear of damaging circuit components such as a driver IC, a TFT element, and a gate line driver circuit, and the production efficiency in a process of manufacturing a liquid crystal display panel or the like can be improved, and the reliability of the production process can be ensured.
Examples
The present invention will be further described with reference to examples.
(example 1)
(production of antistatic surface protective film)
A coating liquid containing 100 parts by weight of a polyurethane binder (ARACOAT (registered trademark) FT200, product name: manufactured by Mitsuka chemical industry Co., Ltd., content of binder nonvolatile components of 40 wt%) and 5.7 parts by weight of a curing agent (ARACOAT (registered trademark) CL2503, product name: ARACOAT (registered trademark) and content of curing agent nonvolatile components of 40 wt%) was applied to the surface of a 38 μm thick polyethylene terephthalate film to a thickness of 20 μm after drying, and then dried in a 100 ℃ hot air circulation type oven for 2 minutes to form a binder layer. Then, a sample was prepared by applying an ethyl acetate solution of lithium bistrifluoromethanesulfonylimide as an antistatic agent to the surface of the adhesive layer so that the thickness of the dried antistatic agent layer was 0.1 μm using a meyer bar No.4, and then drying the antistatic agent layer for 2 minutes using a 100 ℃ hot air circulation oven to form an antistatic agent layer on the surface of the adhesive layer. A release film (Diafil MRF38 made by Mitsubishi resin corporation, silicone release agent treatment was performed on the surface of a polyethylene terephthalate film having a thickness of 38 μm) was bonded to the surface of the adhesive layer of this sample, to obtain the antistatic surface protective film of example 1.
(example 2)
An antistatic surface protective film of example 2 was obtained in the same manner as in example 1, except that the antistatic agent of example 1 was lithium bis-fluorosulfonylimide and the thickness of the antistatic agent layer after drying was 0.05 μm.
(example 3)
In the same manner as in example 1 except that the thickness of the antistatic agent layer of example 1 after drying was 0.3 μm, an antistatic surface protective film of example 3 was obtained.
(example 4)
An antistatic surface protective film of example 4 was obtained in the same manner as in example 1 except that the antistatic agent of example 1 was changed to bis (trifluoromethanesulfonylimide) tri-n-butylmethylammonium (3M Japan, model: FC-4400).
Comparative example 1
An antistatic surface protective film of comparative example 1 was obtained in the same manner as in example 1 except that the antistatic agent layer was laminated on the adhesive layer by mixing the adhesive composition of example 1 with the antistatic agent of example 1 so that the solid content ratio was 100:1.5 and applying the mixture so that the thickness of the dried adhesive layer was 20 μm in the adhesive composition of example 1.
Comparative example 2
In the same manner as in example 1 except that the antistatic agent layer was not provided, the surface protective film of comparative example 2 was obtained.
Comparative example 3
An antistatic surface protective film of comparative example 3 was obtained in the same manner as in example 1, except that the thickness of the antistatic agent layer after drying was 0.5 μm.
The method and results of the evaluation test are shown below.
Method for measuring peeling force of peeling film
A sample of the antistatic surface protective film was cut into a width of 50mm and a length of 150 mm. The strength of the release film when peeled from the antistatic agent layer was measured in a direction of 180 ℃ at a peeling speed of 300 mm/min under a test environment of 23 ℃ x 50% RH with a tensile tester, and this was taken as the peeling force (N/50mm) of the release film.
(method of measuring surface resistivity of surface of antistatic agent)
After the release film was peeled from the sample of the antistatic surface protective film, the surface resistivity of the surface of the antistatic agent layer was measured using a high resistivity meter (Hiresta (registered trademark) -UP, manufactured by mitsubishi chemical Analytech) under conditions of an applied voltage of 100V and a measurement time of 30 seconds.
Method for measuring adhesive force of antistatic surface protective film
An antiglare low reflection treatment polarizing plate (AG-LR polarizing plate) was bonded to the surface of the glass plate using a bonding machine. Then, an antistatic surface protective film cut to a width of 25mm was attached to the surface of the polarizing plate, and then stored for 1 day under a test environment of 23 ℃ x 50% RH. Then, the strength at the time of peeling the antistatic surface protective film was measured in a 180 ° direction at a peeling speed of 300 mm/min using a tensile tester, and this was taken as the adhesive force (N/25 mm).
Method for measuring peeling electrostatic voltage of antistatic surface protective film
An antiglare low reflection treatment polarizing plate (AG-LR polarizing plate) was bonded to the surface of the glass plate using a bonding machine. Then, an antistatic surface protective film cut to a width of 25mm was laminated on the surface of the polarizing plate via an antistatic agent layer, and then stored for 1 day under a test environment of 23 ℃ x 50% RH. Then, the antistatic surface protective film was peeled off at a peeling rate of 40m per minute using a high speed peeling Tester (manufactured by Tester industries), and the surface potential of the surface of the polarizing plate was measured 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 defined as a peeling electrostatic voltage (kV).
Method for confirming surface contamination of antistatic surface protective film
An antiglare low reflection treatment polarizing plate (AG-LR polarizing plate) was bonded to the surface of the glass plate using a bonding machine. Then, an antistatic surface protective film having a width of 25mm was cut by laminating an antistatic agent layer on the surface of the polarizing plate, and then stored in a test environment at 23 ℃ x 50% RH for 3 days and 30 days. Then, the antistatic surface protective film was peeled off to visually observe the staining property of the surface of the polarizing plate. As a criterion for determining the surface contamination property, a case where no contamination transfer was observed on the polarizer was evaluated as "o", and a case where contamination transfer was observed on the polarizer was evaluated as "x".
The results of measurement of the antistatic surface protective films obtained in examples 1 to 4 and comparative examples 1 to 3 are shown in Table 1 and Table 2, LiTFSI means lithium bis (trifluoromethanesulfonylimide), "LiFSI" means lithium bis (fluorosulfonylimide), "FC-4400" means tri (trifluoromethanesulfonylimide) tri (n-butylmethylammonium) and "5.9E 9" in the column of surface resistivity of the antistatic agent layer means 5.9 × 109"Overrange" means that the surface resistivity (Ω/□) exceeds the upper limit of measurement (1.0 × 10)13Above), it cannot be measured.
[ Table 1]
Figure GDA0002552523190000131
[ Table 2]
Figure GDA0002552523190000141
From the measurement results shown in tables 1 and 2, it is understood that:
the antistatic surface protective films of examples 1 to 4 of the present invention have a moderate adhesive force even when they are laminated via an antistatic agent layer, do not contaminate the surface of an adherend, and have a low static pressure at the time of peeling the antistatic surface protective film from the adherend.
On the other hand, the surface protective film of comparative example 1 in which the antistatic agent was uniformly mixed in the pressure-sensitive adhesive layer was good because the peeling static voltage at the time of peeling the surface protective film from the adherend was low, but the staining property to the adherend over time was deteriorated after 30 days of storage. In addition, the surface protective film of comparative example 2 in which the antistatic agent layer was not provided on the surface of the pressure-sensitive adhesive layer increased the peeling electrostatic voltage when peeling the surface protective film from the adherend. Further, in comparative example 3 in which the thickness of the antistatic agent layer was increased, the peeling static voltage was low and good when the surface protective film was peeled from the adherend, but the contamination of the adherend after the peeling was increased.
Industrial applicability
The antistatic surface protective film of the present invention can be used in, for example, production processes of optical films such as polarizing plates, retardation plates, and lens films, and various other optical members, and is bonded to the optical members to protect the surfaces thereof. Further, the surface protective film of the present invention can reduce the amount of static electricity generated when peeled from an adherend, and is less likely to cause a change with time in the peeling antistatic performance and contamination of the adherend, and can improve the yield of production processes for various optical members and the like, and thus has a high industrial utility value.

Claims (2)

1. An antistatic surface protective film characterized by comprising a base film made of a transparent resin and, laminated on one surface thereof in this order, a polyurethane adhesive layer containing no antistatic agent, an antistatic agent layer, and a release film subjected to a release treatment,
the thickness of the polyurethane adhesive layer is 5-40 μm,
the thickness of the antistatic agent layer is 0.01 to 0.3 μm,
the antistatic agent in the antistatic agent layer is selected from LiBr, LiI and LiBF4、LiPF6、LiSCN、LiClO4、LiCF3SO3、Li(FSO2)2N、Li(CF3SO2)2N、Li(C2F5SO2)2N、Li(CF3SO2)3C or more than one compound in the compound group.
2. An optical member formed by attaching the antistatic surface protective film according to claim 1.
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