TW201832915A - Surface protection film - Google Patents

Abstract

The present invention provides an optical surface protection film that is provided with a separator. The thickness of a polyester base material that constitutes part of a separator stacked on an optical surface protection film is specified. Hollow cavities are additionally provided, thereby suppressing the peeling strength of the separator with respect to an adhesive layer and promising exceptional peeling properties and workability. In addition, through the presence of the hollow cavities, the formation of dents caused by the separator can be minimized by using a separator having cushioning properties. This optical surface protection film provided with a separator comprises an optical surface protection film having an adhesive layer on at least one surface of a base material film, and a separator on the opposite surface from the surface of the base material film that comes into contact with the adhesive layer, wherein the separator has a release layer and a polyester base material, the polyester base material has hollow cavities, the thickness of the polyester base material is 25-100 [mu]m, and the 180 degree initial peeling strength of the separator with respect to the adhesive layer is 0.7 N/50mm or less.

Description

Surface protection film

The present invention relates to an optical surface protection film with a separator. In particular, an optical surface protection film for protecting the surface of an optical member (for example, a polarizing plate, a wavelength plate, a retardation plate, an optical compensation film, a reflection sheet, a brightness enhancement film, etc.) used in a liquid crystal display, etc. (Lamination) A specific separator is useful for protecting the surface of the adhesive layer constituting the aforementioned optical surface protective film until it is actually used, which is excellent in peelability or workability, and prevents generation of dents, which is useful.

BACKGROUND ART A surface protection film generally has a configuration in which an adhesive layer is provided on a film-like base film (support). The surface protection film is adhered to the optical member as an adherend through the aforementioned adhesive layer, so as to protect the surface of the optical member from scratches or dirt during processing, transportation, inspection, etc. use. For example, a liquid crystal display panel is formed by bonding an optical member such as a polarizing plate or a wavelength plate to a liquid crystal cell through an adhesive layer. Until the adhesive layer is actually attached to the optical member, it is protected and stored by a release or the like subjected to a release treatment from the necessity of protecting it from drying (Patent Document 1).

After that, when the surface of the adhesive layer of the surface protection film is actually attached to the optical member and used, the separation sheet is peeled off and removed.

Prior technical documents Patent documents Patent document 1: Japanese Patent Application Laid-Open No. 2012-224811

Summary of the Invention Problems to be Solved by the Invention In addition, when the separator is thick, when the peeling force (adhesive force) of the separator to the adhesive layer constituting the surface protective film is increased during peeling or removal, the peelability or workability is poor. Problem.

In addition, if a thin separator is used instead of a thick separator for the application of an adhesive, fine particles (such as a polyester-based filler, etc.) contained in the substrate constituting the separator that adheres to the surface of the separator may be used. ), Which is the cause of dents on the surface of the adhesive layer when the adhesive layer is formed. In addition, when the separator is attached to the adherend in a state where dents are generated on the surface of the adhesive layer, air bubbles enter the dent portion (space) between the adhesive layer and the adherend, and an inspection target is generated. The problem of deterioration of inspection when attached.

Therefore, the present inventors have made efforts in view of the foregoing circumstances, and an object thereof is to provide an optical surface protective film with a separator, which specifically comprises a polyester-based substrate of a separator laminated on the optical surface protective film. Thickness and holes are provided to reduce the stiffness (rigidity) of the separator, and the peeling force of the separator to the adhesive layer can be suppressed, so that the peelability and workability are excellent, and the cushioning properties are excellent by the presence of holes, which can suppress separation The occurrence of dents caused by the parts makes the inspection excellent.

The means for solving the problem, that is, the optical surface protective film with a separator of the present invention includes an optical surface protective film and a separator, and the optical surface protective film has an adhesive layer on at least one side of a base film. The separation member is located on the opposite side of the substrate film that is in contact with the adhesive layer. The optical surface protection film with the separation member is characterized in that the separation member has a release layer and a polyester system. For the substrate, the polyester-based substrate has holes, the thickness of the polyester-based substrate is 25 to 100 μm, and the 180 ° initial peeling force of the separator to the adhesive layer is 0.7 N / 50 mm or less.

In the optical surface protective film with a separator of the present invention, the porosity of the polyester-based substrate is preferably 15% or more relative to the volume of the polyester-based substrate.

In the optical surface protection film with a separator of the present invention, the substrate film is preferably a polyester film.

In the optical surface protective film with a separator according to the present invention, the aforementioned adhesive layer is preferably formed of an adhesive composition containing a (meth) acrylic polymer.

ADVANTAGE OF THE INVENTION According to this invention, the thickness of the polyester base material which comprises the separator laminated | stacked on the optical surface protection film is specified, and a hole is provided in order to suppress the peeling force of the separator to the adhesive layer which comprises the optical surface protection film, and to peel Excellent performance and workability, and the use of a separator with holes and excellent cushioning properties can suppress the occurrence of dents caused by the separator, and can still be produced in the state where the optical surface protection film is attached to the adherend. A protective surface film for optics with a separator with excellent inspection properties is useful.

Embodiments for Carrying Out the Invention Embodiments of the present invention will be described in detail below.

<Overall Structure of Optical Surface Protective Film with Separator> The optical surface protective film with separator (hereinafter sometimes referred to simply as "surface protective film") disclosed here is generally called an adhesive tape The surface of the adhesive layer in the form of an adhesive label, an adhesive film, or the like is protected by a separator, and is particularly suitable for use as an optical component of a liquid crystal display panel in processing, inspection, and transportation of optical parts (such as polarizing plates, wavelength plates, etc.). Surface protection film for the surface of optical parts. The aforementioned adhesive layer of the surface protection film is typically formed continuously, but it is not limited to this form, and may be, for example, an adhesive layer forming regular or random patterns such as dots and stripes. The surface protection film disclosed herein may be in the form of a roll or a single sheet.

<Substrate film> The optical surface protection film which comprises the optical surface protection film with a separator of this invention is characterized by having a substrate film. In the technology disclosed here, although the resin material constituting the base film can be used without particular limitation, it is suitable to use, for example, transparency, mechanical strength, thermal stability, moisture resistance, isotropy, flexibility, and size. Those with excellent stability and other characteristics. In particular, since the base material has flexibility, the adhesive composition can be applied by a roll coater or the like and can be wound into a roll shape, which is useful.

As the substrate film (support), a plastic film composed of a resin material such as polyethylene terephthalate (PET), polymer Polyester polymers such as ethylene naphthalate (PEN), polybutylene terephthalate, etc .; cellulose polymers such as diethyl cellulose, triethyl cellulose, etc .; polycarbonate polymer The main resin component is the acrylic resin such as polymethyl methacrylate (the main component of the resin component is typically a component occupying 50% by weight or more). Other examples of the resin material include those using the following resin materials: styrene polymers such as polystyrene and acrylonitrile-styrene copolymers; polyethylene, polypropylene, and polymers having a cyclic or norbornene structure Olefins based polymers such as olefins and ethylene-propylene copolymers; vinyl chloride polymers; polyamides based polymers such as nylon 6, nylon 6,6, and aromatic polyamides. As other examples of the resin material, fluorene-based polymers, fluorene-based polymers, polyether fluorene-based polymers, polyetheretherketone-based polymers, polyphenylene sulfide-based polymers, and vinyl alcohol-based polymers are mentioned. , Vinylidene chloride polymer, vinyl butyral polymer, aryl ester polymer, polyoxymethylene polymer, epoxy polymer, etc. It may be a base film made of a mixture of two or more of the above polymers.

As the substrate film, a plastic film made of a transparent thermoplastic resin can be suitably used. In the aforementioned plastic film, a polyester film is preferably used. Here, the polyester film refers to a main skeleton having an ester bond such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate. The polyester-based polymer material (polyester resin) is used as the main resin component. The polyester film has excellent characteristics as a base film of a surface protection film, such as excellent optical characteristics and dimensional stability.

The resin material constituting the substrate film may be blended with various additives such as an antioxidant, an ultraviolet absorber, a plasticizer, and a colorant (pigment, dye, etc.) as necessary. For example, a well-known or conventional surface treatment such as a corona discharge treatment, a plasma treatment, an ultraviolet irradiation treatment, an acid treatment, an alkali treatment, and a primer application can be applied. The surface treatment is a treatment that can be used to improve, for example, the adhesion between the substrate film and the adhesive layer (anchorability of the adhesive layer).

The substrate film may be a plastic film to which an antistatic treatment is applied. By using the aforementioned base film, it is preferable to suppress the charging of the surface protection film when it is peeled off. In addition, the base film is a plastic film, and by applying an antistatic treatment to the aforementioned plastic film, the electrification of the surface protection film itself can be reduced, and a person having excellent antistatic ability to an adherend can be obtained. In addition, the method of imparting antistatic function is not particularly limited, and a well-known method can be used. For example, an antistatic resin composed of an antistatic agent and a resin component, or a conductive material containing a conductive polymer or a conductive substance can be applied. The method of resin, or the method of vapor-depositing or electroplating a conductive substance, the method of mixing an antistatic agent, etc. are mentioned.

The thickness of the substrate film is usually 5 to 200 μm, and preferably about 10 to 100 μm. When the thickness of the substrate film is within the foregoing range, it is preferable because it has excellent adhesion properties to the adherend and excellent peelability or workability from the adherend.

The surface protection film disclosed herein can be obtained in a state including other layers in addition to the base film, the adhesive layer, and the separator. Examples of the other layer include an undercoat layer (anchor layer) and the like that can improve the anchoring property of the antistatic layer or the adhesive layer.

<Adhesive layer> The adhesive used in the present invention may be used without particular limitation as long as it is formed of an adhesive composition containing an adhesive polymer having adhesive properties. The adhesive composition may be, for example, an acrylic adhesive, a urethane adhesive, a synthetic rubber adhesive, a natural rubber adhesive, a silicone adhesive, a polyester adhesive, or the like. Among them, It is preferable to use (containing) at least one selected from the group consisting of an acrylic adhesive, a urethane adhesive, and a silicone adhesive, and use ( The (meth) acrylic polymer adhesive composition (acrylic adhesive) is particularly preferable.

When an acrylic adhesive is used for the adhesive layer, the (meth) acrylic polymer constituting the adhesive polymer of the acrylic adhesive may be a (meth) acrylic monomer having 1 to 14 alkyl groups. The body is used as the main monomer as the raw material constituting it. The (meth) acrylic monomer may be used alone or in combination of two or more. By using the (meth) acrylic monomer having the aforementioned 1 to 14 carbons, the peeling force (adhesive force) to the adherend (protected body) can be easily controlled to be low, and light weight can be obtained. A surface protective film having excellent releasability or repeelability. In the present invention, the (meth) acrylic polymer means an acrylic polymer and / or a methacrylic polymer, and the (meth) acrylate means an acrylate and / or a methacrylate .

Specific examples of the (meth) acrylic monomer containing 1 to 14 carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, Secondary butyl (meth) acrylate, tertiary butyl (meth) acrylate, isobutyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, ( N-octyl methacrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, iso- (meth) acrylate Decyl ester, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, n-tetradecyl (meth) acrylate, and the like.

Among the surface protection films of the present invention, n-butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and n-octyl (meth) acrylate are particularly exemplified. Ester, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, (meth) (Meth) acrylic monomers containing 4 to 14 alkyl groups, such as n-dodecyl acrylate, n-tridecyl (meth) acrylate, and n-tetradecyl (meth) acrylate, are preferred. In particular, by using the (meth) acrylic monomer containing a 4- to 14-alkyl group, the peeling force (adhesive force) to an adherend can be easily controlled to be low, and it is excellent in re-peelability. .

In particular, it is preferable that the (meth) acrylic monomer containing 1 to 14 carbon atoms having a carbon number of 1 to 14 is more than 65% by weight based on 100% by weight of the total monomer components constituting the (meth) acrylic polymer. It is preferably 75% by weight or more, more preferably 85 to 99.9% by weight, and most preferably 90 to 99% by weight. When it is less than 50% by weight, moderate wettability of the adhesive composition or cohesive force of the adhesive layer may be deteriorated, which is not preferable.

As the (meth) acrylic polymer, a hydroxyl-containing (meth) acrylic monomer can be used as a raw material monomer. The hydroxyl-containing (meth) acrylic monomer may be used alone or in combination of two or more. By using the aforementioned (meth) acrylic monomer containing a hydroxyl group, it is possible to easily control the cross-linking of the adhesive composition, etc., and it is easier to control the improvement of wettability by flow and the decrease in peeling force (adhesive force) during peeling. balance.

Examples of the hydroxyl-containing (meth) acrylic monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. , 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, (4 -Hydroxymethylcyclohexyl) methacrylate, N-hydroxymethyl (meth) acrylamide, and the like.

With respect to 100% by weight of the total monomer components constituting the (meth) acrylic polymer, it is preferable that the hydroxy-containing (meth) acrylic monomer contains 25% by weight or less, and more preferably 15% by weight Hereinafter, it is more preferably 0.1 to 10% by weight. If it is in the said range, since it is easy to control the balance of the wettability of an adhesive composition and the cohesive force of the obtained adhesive layer, it is preferable.

In addition, as another polymerizable monomer component, from the reason that it is easy to obtain a balance in adhesive properties, in order to make Tg 0 ° C or lower (usually -100 ° C or higher), it can be used within a range that does not impair the effect of the present invention. It is used to adjust the glass transition temperature of the (meth) acrylic polymer, the peelable polymerizable monomer, and the like.

As the (meth) acrylic polymer, a carboxyl group-containing (meth) acrylic monomer can be used as a raw material monomer. By using the (meth) acrylic monomer containing the carboxyl group, it is possible to suppress an increase in the adhesive force of the adhesive layer (surface protection film) with the passage of time, and to increase re-peelability, anti-adhesive force, and workability. Excellent. Moreover, in addition to being excellent in the cohesive force of an adhesive layer, it is excellent also in a shear force, and it is preferable.

Examples of the carboxyl group-containing (meth) acrylic monomer include (meth) acrylic acid, carboxyethyl (meth) acrylate, and carboxypentyl (meth) acrylate.

The carboxyl-containing (meth) acrylic monomer is preferably 10% by weight or less, more preferably 0 to 8% by weight, based on 100% by weight of the total monomer components constituting the (meth) acrylic polymer. More preferably, it is 0 to 6% by weight. If it is in the said range, since it is easy to control the balance of the wettability of an adhesive composition and the cohesive force of the obtained adhesive layer, it is preferable.

Moreover, as long as it is the range which does not impair the characteristic of this invention, the said (meth) acrylic-type polymer can use the polymerizable monomer other than the said raw material monomer without a restriction | limiting. For example, as the other polymerizable monomers, components that improve cohesion and heat resistance, such as a cyano-containing monomer, a vinyl ester monomer, and an aromatic vinyl monomer, or a fluorenimine-containing monomer and a fluorinimide-containing monomer can be suitably used. , Amine-containing monomers, epoxy-containing monomers, N-acrylfluorenyl morpholine, vinyl ether monomers, etc. have functional groups that improve peeling force (adhesive force) and can function as a crosslinking point ingredient. Among them, nitrogen-containing monomers such as a cyano-containing monomer, a fluorenylamine-containing monomer, a fluorenimine-containing monomer, an amine-containing monomer, and N-propenylmorpholine are preferred. The use of a nitrogen-containing monomer is useful because it can ensure that a moderate peeling force (adhesive force) such as embossing or peeling does not occur, and a surface protective film excellent in shearing force can be obtained. These polymerizable monomers can be used alone or in combination of two or more.

Examples of the cyano-containing monomer include acrylonitrile and methacrylonitrile.

Examples of the amidino group-containing monomer include acrylamide, methacrylamide, diethylacrylamide, N-vinylpyrrolidone, N, N-dimethylacrylamide, N, N- Dimethylmethacrylamide, N, N-diethylacrylamide, N, N-diethylmethacrylamide, N, N'-methylenebisacrylamide, N, N- Dimethylaminopropyl acrylamide, N, N-dimethylaminopropylmethacrylamide, diacetone acrylamide, and the like.

Examples of the fluorenimine-containing monomer include cyclohexylmaleimide, isopropylmaleimide, N-cyclohexylmaleimide, and ikonimine.

Examples of the amino group-containing monomer include aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and N, N-dimethylaminopropyl ( (Meth) acrylates and the like.

Examples of the vinyl ester monomer include vinyl acetate, vinyl propionate, and vinyl laurate.

Examples of the aromatic vinyl monomer include styrene, chlorostyrene, chloromethylstyrene, α-methylstyrene, and other substituted styrenes.

Examples of the epoxy-group-containing monomer include glycidyl (meth) acrylate, methyl glycidyl (meth) acrylate, allyl glycidyl ether, and the like.

Examples of the vinyl ether monomer include methyl vinyl ether, ethyl vinyl ether, and isobutyl vinyl ether.

In the present invention, the other polymerizable monomer is preferably 0 to 30% by weight, and more preferably 0 to 10% by weight, based on 100% by weight of the total monomer components constituting the (meth) acrylic polymer. The other polymerizable monomers may be appropriately adjusted in order to obtain desired characteristics.

The (meth) acrylic polymer may further contain an alkylene oxide-containing reactive monomer as a monomer component.

In addition, from the viewpoint of compatibility with the oxyalkylene-containing compound, the average addition mol number of the oxyalkylene unit of the aforementioned alkylene oxide-containing reactive monomer is preferably 1 to 40, which is more than It should be 3 ~ 40, more preferably 4 ~ 35, especially 5 ~ 30. When the average addition mole number is 1 or more, there is a tendency that the effect of reducing contamination of an attached body (protected body) can be efficiently obtained. In addition, when the average addition mole number is greater than 40, the interaction with the oxygen-containing alkylene compound is increased, and the viscosity of the adhesive composition tends to increase, making it difficult to apply, which is not preferable. In addition, the end of the oxyalkylene chain may be a hydroxyl group, or may be substituted with other functional groups.

The aforementioned alkylene oxide-containing reactive monomer may be used singly or in combination of two or more kinds. However, the total content is preferably the total monomer component of the (meth) acrylic polymer. 0 to 20% by weight, more preferably 0 to 10% by weight. If the content of the alkylene oxide-containing reactive monomer exceeds 20% by weight, the contamination of the adherend will deteriorate, which is not preferable.

Examples of the oxyalkylene unit of the reactive monomer containing an alkylene oxide group include those having 1 to 6 carbon atoms, and examples include oxymethylene, oxyethyl, oxypropyl, and oxygen. Butyl and so on. The hydrocarbon group of the oxyalkylene chain may be straight or branched.

Moreover, it is more preferable that the said reactive group containing an epoxy alkylene group is a reactive monomer which has an epoxy ethyl group. By using a (meth) acrylic polymer containing a reactive monomer containing an epoxyethyl group as a base polymer, the compatibility between the base polymer and the oxygen-containing alkylene compound can be improved, and it is suitable to suppress the adhesion to the substrate. The body oozes, and a low-contamination adhesive composition is obtained.

Examples of the alkylene oxide-containing reactive monomer include, for example, a reaction of a (meth) acrylic acid alkylene oxide adduct, or a reaction having a reactive substituent such as acrylfluorenyl group, methacrylfluorenyl group, and allyl group in the molecule. Sexual surfactants and so on.

Specific examples of the (meth) acrylic acid alkylene oxide adduct include, for example, polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, and polyethylene glycol-polypropylene glycol (meth) acrylic acid. Ester, polyethylene glycol-polybutylene glycol (meth) acrylate, polypropylene glycol-polybutylene glycol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, ethoxypoly Ethylene glycol (meth) acrylate, butoxy polyethylene glycol (meth) acrylate, octyloxy polyethylene glycol (meth) acrylate, lauryloxy polyethylene glycol (meth) acrylate Ester, stearyloxy polyethylene glycol (meth) acrylate, phenoxy polyethylene glycol (meth) acrylate, methoxy polypropylene glycol (meth) acrylate, octyloxy polyethylene glycol -Polypropylene glycol (meth) acrylate and the like.

Specific examples of the reactive surfactant include, for example, an anionic reactive surfactant having a (meth) acrylfluorenyl group or an allyl group, a nonionic reactive surfactant, and a cationic reactive surfactant. Agent.

The weight average molecular weight (Mw) of the aforementioned (meth) acrylic polymer is preferably 100,000 to 5 million, more preferably 200,000 to 4 million, more preferably 300,000 to 3 million, and most preferably 300,000 to 120 Million. When the weight-average molecular weight is less than 100,000, the cohesive force of the adhesive layer tends to be small, so that adhesive residue tends to occur. On the other hand, when the weight-average molecular weight exceeds 5 million, the fluidity of the polymer decreases, and the wettability of the adherend (for example, a polarizing plate) becomes insufficient, and there is an adhesive that causes the adherend and the surface protection film. The tendency to cause swelling between layers. The weight-average molecular weight is measured by GPC (gel permeation chromatography).

The glass transition temperature (Tg) of the (meth) acrylic polymer is preferably 0 ° C or lower, more preferably 10 ° C or lower (usually -100 ° C or higher). When the glass transition temperature is higher than 0 ° C, the polymer does not easily flow, so that, for example, the wetting of the polarizing plate, which is an optical member, becomes insufficient, and there is a cause of expansion between the polarizing plate and the adhesive layer of the surface protection film. Propensity. In particular, by setting the glass transition temperature to -70 ° C or lower, an adhesive layer having excellent wettability and light peelability to a polarizing plate can be easily obtained. The glass transition temperature of the (meth) acrylic polymer can be adjusted within the aforementioned range by appropriately changing the monomer component or composition ratio used.

The method for polymerizing the (meth) acrylic polymer is not particularly limited, and it can be polymerized by well-known methods such as solution polymerization, emulsion polymerization, block polymerization, and suspension polymerization. However, it is particularly preferable from the viewpoint of workability or the adherend ( From the aspect of the low pollution property of the protected body), solution polymerization is a preferable aspect. The obtained polymer may be any of a random copolymer, a block copolymer, an alternating copolymer, and a graft copolymer.

<Oxyalkylene-containing compound> The adhesive composition used in the present invention may contain an oxygen-containing alkylene compound. By containing an oxygen-containing alkylene compound, light peelability can be further exhibited. Examples of the oxygen-containing alkylene compound include an organic polysiloxane having an oxyalkylene chain or an oxygen-containing alkylene compound not containing an organic polysiloxane.

Taking the specific example of the organopolysiloxane having an oxyalkylene chain as described above, specific examples of the organopolysiloxane having an oxyalkylene chain in the main chain include, for example, a trade name X- 22-4952, X-22-4272, X-22-6266, KF-6004, KF-889 (the above is manufactured by Shin-Etsu Chemical Industry Co., Ltd.), BY16-201, SF8427 (the above is manufactured by Toray‧Dow Corning), IM22 (Manufactured by Asahi Kasei Wacker). Specific examples of the organopolysiloxane having an oxyalkylene chain in a side chain include, for example, commercially available product names KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-615A, KF-945, KF-640, KF-642, KF-643, KF-6022, X-22-6191, X-22-4515, KF-6011, KF-6012, KF-6015, KF- 6017, X-22-2516 (the above are manufactured by Shin-Etsu Chemical Industry Co., Ltd.) SF8428, FZ-2162, SH3749, FZ-77, L-7001, FZ-2104, FZ-2110, L-7002, FZ-2122, FZ- 2164, FZ-2203, FZ-7001, SH8400, SH8700, SF8410, SF8422 (above manufactured by Toray‧Dow Corning), TSF-4440, TSF-4441, TSF-4445, TSF-4450, TSF-4446, TSF- 4452, TSF-4460 (the above are manufactured by Momentive Performance Materials), BYK-333, BYK-307, BYK-377, BYK-UV3500, BYK-UV3570 (by BYK-Chemie Japan), and the like. These compounds can be used alone or in combination of two or more.

Specific examples of the aforementioned oxygen-containing alkylene compound containing no organic polysiloxane include polyoxyalkylene alkylamine, polyoxyalkylene diamine, polyoxyalkylene fatty acid ester, and polyoxyalkylene. Alkyl sorbitol fatty acid ester, polyoxyalkylene alkylphenyl ether, polyoxyalkylene alkyl ether, polyoxyalkylene alkylallyl ether, polyoxyalkylene alkylphenylene Non-ionic surfactants such as propyl ether; polyoxyalkylene alkyl ether sulfate, polyoxyalkylene alkyl ether phosphate, polyoxyalkylene alkyl phenyl ether sulfate, poly Anionic surfactants such as oxyalkylene alkyl phenyl ether phosphate ester salts; In addition, there are cationic surfactants or zwitterionic surfactants with a polyoxyalkylene chain (polyoxyalkylene chain). , Polyether compounds (and derivatives thereof) having a polyoxyalkylene chain, acrylic compounds (and derivatives thereof) having a polyoxyalkylene chain, and the like. The polyoxyalkylene chain-containing monomer may be blended as a polyoxyalkylene chain-containing compound. The polyoxyalkylene chain-containing compound may be used alone or in combination of two or more kinds.

Specific examples of the polyether compound (polyether component) having a polyoxyalkylene chain include a block copolymer of polypropylene glycol (PPG) -polyethylene glycol (PEG), and a block of PPG-PEG-PPG. Copolymers, block copolymers of PEG-PPG-PEG, etc. Examples of the derivative of the polyether-based compound having a polyoxyalkylene chain include an oxyalkylene compound (PPG monoalkyl ether, PEG-PPG monoalkyl ether, etc.) having an etherified terminal, and ethyl acetate at the terminal. Chemical oxygenated compounds (such as terminal acetylated PPG, etc.).

Examples of the acrylic compound having a polyoxyalkylene chain include a (meth) acrylate polymer having an oxyalkylene group. As the aforementioned oxyalkylene group, the addition mole number of the oxyalkylene unit is preferably 1 to 50, more preferably 2 to 30, and even more preferably 2 to 20. The terminal of the oxyalkylene chain may be a hydroxyl group, or may be substituted with an alkyl group, a phenyl group, or the like.

The aforementioned (meth) acrylate polymer having an oxyalkylene group is preferably a polymer containing (meth) acrylic acid alkylene oxide as a monomer component. Taking specific examples of the aforementioned (meth) acrylic acid alkylene oxide, Examples of the (meth) acrylate containing a glycol group include methoxy groups such as methoxy-diethylene glycol (meth) acrylate and methoxy-triethylene glycol (meth) acrylate. -Polyethylene glycol (meth) acrylate type, ethoxy-polyethylene glycol, such as ethoxy-diethylene glycol (meth) acrylate, ethoxy-triethylene glycol (meth) acrylate, etc. Glycol (meth) acrylate type, butoxy-polyethylene glycol (butoxy-diethylene glycol (meth) acrylate, butoxy-triethylene glycol (meth) acrylate, etc.) Meth) acrylate type, phenoxy-polyethylene glycol (meth), such as phenoxy-diethylene glycol (meth) acrylate, phenoxy-triethylene glycol (meth) acrylate, etc. Acrylate type, 2-ethylhexyl-polyethylene glycol (meth) acrylate, nonylphenyl-polyethylene glycol (meth) acrylate type, methoxy-dipropylene glycol (meth) acrylate Methoxy-polypropylene glycol (meth) acrylate type, etc. .

Moreover, you may use other monomer components other than the said (meth) acrylic-acid alkylene oxide as said monomer component. Specific examples of other monomer components include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, secondary butyl (meth) acrylate, and tributyl (meth) acrylate. Grade butyl, isobutyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate , N-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, ( Acrylates and / or methacrylates having an alkyl group having 1 to 14 carbon atoms such as n-tridecyl methacrylate and n-tetradecyl (meth) acrylate.

In addition, a carboxyl group-containing (meth) acrylate, a phosphate group-containing (meth) acrylate, a cyano group-containing (meth) acrylate, a vinyl ester, an aromatic vinyl compound, and an acid anhydride may be used as appropriate. (Meth) acrylates based on hydroxyl groups, (meth) acrylates containing hydroxyl groups, (meth) acrylates containing amino groups, (meth) acrylates containing amino groups, (meth) groups containing epoxy groups ), Acrylate, N-acryl fluorenyl morpholine, vinyl ethers, etc. as other monomer components other than the aforementioned (meth) acrylic acid alkylene oxide.

As a preferred aspect, the aforementioned polyoxyalkylene-containing compound containing no organopolysiloxane is a compound having a (poly) ethylene oxide chain at least in part. By blending the aforementioned (poly) epoxyethyl chain-containing compound, the compatibility with the base polymer can be improved, the exudation to the adherend can be suppressed well, and an adhesive composition with low pollution can be obtained. Among them, when a block copolymer of PPG-PEG-PPG is used, an adhesive having excellent low staining properties can be obtained. As the aforementioned polyoxyethylene chain-containing compound, the weight of the (poly) oxyethyl chain to the aforementioned polyoxyalkylene group-containing compound containing no organic polysiloxane is preferably 5 to 90% by weight, and more preferably It is 5 to 85% by weight, more preferably 5 to 80% by weight, and most preferably 5 to 75% by weight.

Examples of the commercially available polyoxyalkylene chain-containing compound containing no organic polysiloxane include Adeka Pluonic 17R-4 and Adeka Pluonic 25R-2 (all of which are manufactured by ADEKA); Latemul PD-420 , Latemul PD-420, Latemul PD-450, Emulgen 120 (made by Kao Corporation); Aqualon HS-10, KH-10, Noigen EA-87, EA-137, EA-157, EA-167, EA-177 (above Manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.).

The content of the oxygen-containing alkylene compound is preferably 0.01 to 5.0 parts by weight relative to 100 parts by weight of an adhesive polymer (a main polymer such as a (meth) acrylic polymer) constituting the adhesive composition. It is preferably 0.02 to 2 parts by weight, more preferably 0.03 to 1.6 parts by weight, and most preferably 0.1 to 0.8 parts by weight. If it is in the said range, the light peelability (repeelability) of the adhesive layer (surface protection film) used by this invention can be shown easily, and it is preferable.

<Crosslinking agent> In the surface protection film of this invention, it is preferable that the said adhesive composition contains a crosslinking agent. In the present invention, an adhesive layer can be formed using the aforementioned adhesive composition. For example, when the pressure-sensitive adhesive composition is an acrylic pressure-sensitive adhesive containing the (meth) acrylic polymer, the constitutional unit, the composition ratio, and the cross-linking agent of the (meth) acrylic polymer are appropriately adjusted. Selection, addition ratio, and the like are used for crosslinking to obtain an adhesive layer (surface protection film) having more excellent heat resistance.

As the cross-linking agent used in the present invention, an isocyanate compound, an epoxy compound, a melamine resin, an aziridine derivative, a metal chelate compound, and the like can be used. In particular, an isocyanate compound or an epoxy compound is preferably used. These compounds may be used alone or in combination of two or more.

Examples of the isocyanate compound include aliphatic polyisocyanates such as trimethylene diisocyanate, butylene diisocyanate, hexamethylene diisocyanate (HDI), and diisocyanate; dicyclopentyl Alicyclic isocyanates such as diisocyanate, cyclohexyl diisocyanate, isophorone diisocyanate (IPDI), 1,3-bis (isocyanatomethyl) cyclohexane; 2,4-toluene diisocyanate , 4,4'-diphenylmethane diisocyanate, stubble diisocyanate (XDI) and other aromatic isocyanates; Urea formate bond, biuret bond, trimeric isocyanate bond, uretdione bond, urea Bond, carbodiimide bond, uretonimine bond, and two A polyisocyanate modified body obtained by modifying the aforementioned isocyanate compound, such as a triketone bond. Commercially available products include, for example, the trade names Takenate 300S, Takenate 500, Takenate 600, Takenate D165N, Takenate D178N (the above are manufactured by Takeda Pharmaceutical Industry Co., Ltd.); Sumidur T80, Sumidur L, Desmodur N3400 (the above are manufactured by Sumitomo Bayer Urethane) ; Millionate MR, Millionate MT, Coronate L, Coronate HL, Coronate HX (the above are manufactured by Japan Polyurethane Industry Corporation), etc. These isocyanate compounds may be used singly or in combination of two or more kinds. A difunctional isocyanate compound and a trifunctional or more isocyanate compound may also be used in combination. By using a cross-linking agent in combination, cohesiveness and rebound resistance (adhesion to curved surfaces) can coexist, and an adhesive layer (surface protection film) having more excellent adhesion resistance can be obtained.

Examples of the epoxy compound include N, N, N ', N'-tetraepoxypropyl-stubble diamine (trade name TETRAD-X, manufactured by Mitsubishi Gas Chemical Co., Ltd.) or 1,3-bis (N, N -Diglycidylaminomethyl) cyclohexane (trade name TETRAD-C, manufactured by Mitsubishi Gas Chemical Co., Ltd.) and the like.

Examples of the melamine-based resin include hexamethylolmelamine. Examples of the aziridine derivative include commercially available products such as HDU, TAZM, and TAZO (the above are manufactured by Muta Pharmaceutical Co., Ltd.).

Examples of the metal chelate compound include aluminum, iron, tin, titanium, and nickel as the metal component, and examples of the chelate component include acetylene, methyl ethyl acetate, and ethyl lactate.

The content of the cross-linking agent used in the present invention is preferably 0.01 to 20 parts by weight, more preferably 0.1 to 15 parts by weight, and more preferably 0.5 to 10 parts by weight relative to 100 parts by weight of the aforementioned (meth) acrylic polymer. Parts, most preferably 1 to 8 parts by weight. When the foregoing content is less than 0.01 parts by weight, the cross-linking formation using the cross-linking agent may be insufficient, resulting in a decrease in the cohesive force of the obtained adhesive layer, and failing to obtain sufficient heat resistance, and may cause The tendency of the cause of residual glue. On the other hand, when the content exceeds 20 parts by weight, the cohesion of the polymer will increase and the fluidity will decrease. Wetting of the adherend (such as a polarizing plate) will be insufficient, which may cause the adherence of the adherend and the adhesive. There is a tendency that the cause of swelling occurs between layers (adhesive composition layer). These crosslinking agents may be used alone or in combination of two or more.

<Crosslinking Catalyst> The adhesive composition may further include a crosslinking catalyst for making any of the above-mentioned crosslinking reactions more efficient. As the cross-linking catalyst, for example, tin-based catalysts such as dibutyltin dilaurate, dioctyltin dilaurate, etc .; ginseng (acetone acetone) iron, ginseng (hexano-2,4-dione) iron, Ginseng (hepta-2,4-dione) iron, ginseng (hepta-3,5-dione) iron, ginseng (5-methylhexa-2,4-dione) iron, ginseng (oct-2,4 -Dione) iron, ginseng (6-methylheptan-2,4-dione) iron, ginseng (2,6-dimethylheptan-3,5-dione) iron, ginseng (non-2,4 -Dione) iron, ginseng (non-4,6-dione) iron, ginseng (2,2,6,6-tetramethylheptan-3,5-dione) iron, ginseng (tridecane-6 , 8-diketone) iron, ginseng (1-phenylbutane-1,3-diketone) iron, ginseng (hexafluoroacetamidine acetone) iron, ginseng (ethyl acetate) iron, ginseng (acetic acid) -N-propyl) iron, ginseng (isopropyl acetoacetate) iron, ginseng (ethyl acetic acid-n-butyl) iron, ginseng (acetic acid acetic acid-secondary butyl) iron, ginseng (acetic acid acetic acid-three Grade butyl) iron, ginseng (methyl propionate acetate) iron, ginseng (ethyl propionate acetate) iron, ginseng (propyl acetate-n-propyl) iron, ginseng (isopropyl propyl acetate) iron, ginseng (Propyl acetate-n-butyl) iron, ginseng (propyl acetate-secondary butyl) iron, ginseng (propyl acetate-tertiary butyl) iron, ginseng (benzyl acetoacetate) iron, ginseng (propyl Dimethyl diacid) iron, ginseng ( Iron-based catalysts such as diethyl malonate), trimethoxy iron, triethoxy iron, triisopropoxy iron, and iron (III) chloride. These catalysts may be used singly or in combination of two or more kinds.

The content of the cross-linking catalyst is not particularly limited, but it is preferably set to about 0.0001 to 1 part by weight, and more preferably 0.001 to 0.5 part by mass, relative to 100 parts by weight of the (meth) acrylic polymer. If it is within the aforementioned range, the speed of the cross-linking reaction when the adhesive layer is formed is fast, and the useful life of the adhesive composition becomes long, which is a preferable aspect.

In addition, the aforementioned adhesive composition may also contain other well-known additives, for example, powders such as a slip agent, a colorant, and a pigment may be appropriately added according to the purpose of use; a plasticizer, an adhesion imparting agent, a low molecular weight polymer, Surface lubricants, leveling agents, antioxidants, anticorrosives, light stabilizers, UV absorbers, polymerization inhibitors, silane coupling agents, antistatic agents, inorganic or organic fillers, metal powder, particles, foils, etc. .

<Surface Protective Film for Optical with Separator> The optical surface protective film (surface protection film) with a separator of the present invention is formed by forming the aforementioned adhesive layer on at least one side of a base film. At this time, Generally, the cross-linking of the adhesive composition is performed after the adhesive composition is applied, but an adhesive layer composed of the cross-linked adhesive composition may also be transferred to a substrate film or the like.

The method for forming the adhesive layer on the substrate film is not particularly limited. For example, the adhesive composition (solution) can be coated on the substrate film, and the polymerization solvent and the like can be dried and removed on the substrate. An adhesive layer is formed on the film. Thereafter, curing may be performed for adjustment of the components of the adhesive layer, adjustment of the crosslinking reaction, and the like. In addition, when an adhesive composition is coated on a base film to prepare a surface protection film, one or more solvents other than a polymerization solvent may be newly added to the adhesive composition, so that it can be uniformly applied to the adhesive composition. On the substrate film.

As a method for forming an adhesive layer when producing the surface protective film of the present invention, a known method for producing an adhesive tape can be used. Specific examples include roll coating, gravure coating, reverse roll coating, roll brushing, spray coating, air knife coating, and extrusion coating using a die coater.

In the surface protection film of the present invention, the thickness of the aforementioned adhesive layer is usually 3 to 100 μm, and it is preferably made to be about 5 to 50 μm. If the thickness of the adhesive layer is within the aforementioned range, an appropriate balance between re-peelability and adhesiveness can be easily achieved, so it is preferable.

In addition, the total thickness of the surface protection film of the present invention is preferably 8 to 300 μm, more preferably 10 to 200 μm, and most preferably 20 to 100 μm. If it is in the said range, it is excellent in adhesive characteristics (re-peelability, adhesiveness, etc.), workability | operativity, and external appearance characteristics. In addition, the said total thickness means the total thickness of all the layers including a base film, an adhesive layer, a separator, and other layers.

<Separator> The surface protection film of the present invention is a surface protection film having an adhesive layer on at least one side of the substrate film, and having a separator on the opposite side of the substrate film in contact with the adhesive layer; the surface protection The film is characterized in that the separating member has a release layer and a polyester-based substrate, the polyester-based substrate has holes, the thickness of the polyester-based substrate is 25 to 100 μm, and the separating member faces the adhesive layer. The 180 ° initial peeling force is below 0.7N / 50mm. The aforementioned separator is for bonding the separator on the surface of the adhesive layer in order to protect the adhesive surface of the adhesive layer. Especially because of the specific thickness and holes, the stiffness (rigidity) of the separator itself can be suppressed to a low level, so that When the separator is peeled from the surface of the adhesive layer, it has excellent peelability and workability, and can provide cushioning properties through holes, so as to prevent fear of adhesion dents and the like generated after the application of the adhesive, which is a preferable aspect.

<Polyester-based substrate> The polyester-based substrate (which may be simply referred to as a "substrate") is not particularly limited as long as it is a polyester-based film that protects the adhesive layer and has holes, and examples thereof include Polyethylene terephthalate film, polyethylene naphthalate, polybutylene terephthalate, etc.

The thickness of the aforementioned polyester-based substrate is 25 to 100 μm, preferably 30 to 80 μm, and preferably 40 to 70 μm. If it is in the said range, since it is excellent in the adhesion property with respect to an adhesive layer, and peelability or workability with respect to an adhesive layer, it is preferable. In addition, if the thickness of the base material is more than 100 μm, the stiffness (rigidity) of the separator itself becomes strong, resulting in poor peelability and workability.

The polyester-based substrate may be subjected to various surface treatments, such as corona discharge treatment, or various surface treatments, such as embossing, if necessary. Fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, ultraviolet absorbers, antistatic agents, lubricants, plasticizers, colorants (pigments, dyes, etc.), etc. Various additives.

With respect to the volume of the aforementioned polyester-based substrate, the porosity of the polyester-based substrate is preferably 15% (vol%) or more, more preferably 18% or more, and more preferably 20% or more. With a porosity of 15% or more, the cushioning property of the separator can be improved, and the filler (for example, polyparaphenylene terephthalate) contained in the substrate film constituting the optical surface protection film or the polyester-based substrate constituting the separator can be absorbed. Ethylene formate (PET) filler) can suppress unevenness, and can suppress the occurrence of adhesion dents and the like caused by separators. In addition, since the stiffness (rigidity) of the separator is low, the peelability of the separator can be improved. From the viewpoint of the strength of the separator, etc., the porosity is preferably 40% or less, and more preferably 30% or less.

The shape of the pores of the polyester-based substrate is a spherical shape, an elliptical spherical shape, a thin linear shape, or the like, and is preferably in a dispersed form. The dispersion diameter is preferably 0.01 to 100 μm, and more preferably 0.05 to 30 μm. If it is in the said range, it will have the intensity | strength of a separator, and it will be excellent in cushioning property and the peelability of a separator, and it is a preferable aspect. The shape of the hole can be observed by observing the cross section of the substrate with a scanning electron microscope.

<Release layer> The said release layer has adhesiveness with respect to the said polyester-type base material, and has peelability with respect to the said adhesive layer, and can be formed from a release agent composition. The aforementioned release agent composition is not particularly limited, and a polysiloxane compound such as dimethylsiloxane or diphenylsiloxane; a long-chain alkyl group such as a polysiloxane resin, a fluororesin, and ASHIO RESIN can be used. Department of compounds and so on.

In addition, the aforementioned release agent composition may also contain other well-known additives, for example, powders such as an antistatic agent, a colorant, and a pigment may be appropriately added according to the use; a surfactant, a plasticizer, and an adhesion-imparting agent. , Low molecular weight polymers, surface lubricants, leveling agents, antioxidants, corrosion inhibitors, light stabilizers, UV absorbers, polymerization inhibitors, silane coupling agents, inorganic or organic fillers, metal powders, particles, etc.

<Preparation of separator> The said separator is a thing formed by using the said mold release agent composition on the said polyester base material.

The method for forming a release layer on the polyester-based substrate is not particularly limited. For example, a solution of the release agent composition is applied to the substrate, and a polymerization solvent is dried and removed to form the substrate. Release layer to make. After that, it may be cured for adjustment of the component transfer of the release layer and the like. When the release agent composition is coated on a substrate to prepare a release layer, one or more solvents other than a polymerization solvent may be added to the release agent composition to uniformly apply the release agent composition. On the substrate.

As the method for forming the release layer, a well-known method for producing a release layer can be used. Specific examples include roll coating, gravure coating, reverse roll coating, roll brushing, spray coating, air knife coating, and extrusion coating using a die coater.

The thickness of the aforementioned release layer is typically 1 to 200 nm, preferably 5 to 100 nm, and more preferably 10 to 50 nm. If the thickness of the release layer is too small, the release effect of the release layer is weak and it is difficult to peel off the separator. Therefore, it may be difficult to perform the operation of bonding the optical surface protection film. On the other hand, if it is too thick, the contamination of the adhesive layer of the optical surface protection film may be affected.

The commercially available products of the aforementioned separators include, for example, Crisper K7211-50 μm, Crisper K7211-38 μm (the above is manufactured by Toyobo Corporation); PET50 (K2411) PAT1 8LK, PET50 (K2411) PAT1 9K (the above manufactured by Lintec), and the like.

<Lamination of Optical Surface Protection Film and Separator> The form of the optical surface protection film with separator of the present invention is such that the release layer of the separator is bonded to the surface of the adhesive layer of the optical surface protection film. to make. The laminating industry can use well-known manufacturing methods.

<Optical member> In the present invention, the optical surface protective film obtained by peeling the separator from the surface of the adhesive layer of the optical surface protective film with a separator may be attached to the optical member to protect the optical member. The above-mentioned separator is not easy to generate dents because of its excellent cushioning property, and has good peelability, and the above-mentioned optical surface protection film has excellent appearance level (appearance), so it can be used for surface protection during processing, transportation, and shipping. The use (surface protection film) is for protecting the surface of the aforementioned optical member (polarizing plate, etc.). Examples

The following describes several embodiments related to the present invention, but it is not intended to limit the present invention to those shown in the related specific examples. In addition, "part" and "%" in the following description are based on weight unless otherwise specified. The blending amount (addition amount) is shown in the table.

In addition, each characteristic in the following description is measured or evaluated as described below.

<Measurement of Porosity of Polyester-Based Substrates Forming Separator Parts> After taking a photograph of a cross-section of a polyester-based substrate with a scanning electron microscope, the holes in the cross-sectional area are drawn on a tracing film, and the entire surface is painted. Image processing was performed with an image analysis device, and the porosity (%) was determined as the area ratio, and the value was directly expressed as the porosity (volume%).・ Scanning electron microscope used: S-510 type scanning electron microscope manufactured by Hitachi, Ltd. ・ Image analysis device used: Luzex IID manufactured by Nireco Co., Ltd.

<Measurement of the thickness of the separator> The thickness of the separator (the thickness of the separator) is the total thickness of the polyester-based substrate and the release layer, and was measured using R1-205 manufactured by Ozaki Manufacturing Co., Ltd.

<Measurement of glass transition temperature (Tg) of (meth) acrylic polymer> The glass transition temperature Tg (° C) is the glass transition temperature Tgn (° C) of the homopolymer formed from each monomer using the following literature values. And calculated from the following formula. Formula: 1 / (Tg + 273) = Σ [Wn / (Tgn + 273)] (where Tg (℃) represents the glass transition temperature of the copolymer, Wn (-) represents the weight fraction of each monomer, Tgn (° C) represents the glass transition temperature of the homopolymer of each monomer, and n represents the type of each monomer). Literature value: 2-ethylhexyl acrylate (2EHA): -70 ° C Butyl acrylate (BA): -55 ° C 2-hydroxyethyl acrylate (HEA): -15 ° C Acrylic acid (AA): 106 ° C The value refers to "Synthesis, Design and New Application Development of Acrylic Resin" (published by the Publishing Department of the Central Management Development Center).

<Measurement of weight average molecular weight (Mw) of (meth) acrylic polymer> The weight average molecular weight (Mw) of (meth) acrylic polymer used was a GPC device (HLC- 8220GPC). The measurement conditions are as follows: Sample concentration: 0.2% by weight (THF solution) Sample injection volume: 10 μl Eluent: THF Flow rate: 0.6ml / min Measurement temperature: 40 ° C Column: Sample column: TSKguardcolumn SuperHZ-H (1) + TSKgel SuperHZM-H (2 pcs.) Reference column: TSKgel SuperH-RC (1 pc.) Detector: Differential refractometer (RI) In addition, the weight-average molecular weight is calculated by polystyrene conversion.

＜ Are there any dents on the surface of the adhesive layer ＞ Under a darkroom fluorescent lamp, the separator was peeled off from the surface of the adhesive layer of the optical surface protection film, and the light was reflected on the surface of the adhesive layer. The presence or absence of dents was visually confirmed. mark. When there is no dent, it is marked as ○, and when there is a dent, it is marked as X.

<Measurement of the initial peeling force of the separator> As shown in FIG. 2, the optical surface protective film 3 with a separator was cut into a size of 50 mm in width and 100 mm in length, and a double-sided tape 4 (Nitto Denko Co., Ltd., No. 500) Glass 5 (S9213, manufactured by Matsushita Glass Industry Co., Ltd.) is pressed at a pressure of 0.25 MPa and a speed of 0.3 m / min to form a substrate film 22 for the optical surface protection film 3 with a separator. s surface. Then, the single-sided adhesive tape 6 (No. 720, manufactured by Nitto Denko Corporation, 50 mm wide) was cut to a length of 50 mm. The adhesive surface of the single-sided adhesive tape 6 was manually pressed to a 50 mm-wide separator 1 with an optical surface protection film 3 with a separator, so that the end thereof exceeded 1 mm. It was left to stand at 23 ° C and 50% RH for 10 seconds. Thereafter, the single-sided adhesive tape 6 was peeled at a speed of 0.3 m / min with a universal testing machine at a speed of 0.3 m / min, and the maximum stress applied at the beginning of the peeling at the time of peeling was taken as the initial peeling force (N / 50 mm).

The aforementioned initial peeling force (peeling force) is 0.7 N / 50 mm or less, preferably 0.68 N / 50 mm or less, and more preferably 0.65 N / 50 mm or less. If the initial peeling force is greater than 0.7 N / 50 mm, it takes time to peel the separator from the surface of the adhesive layer of the optical surface protection film when a thick separator is used, which results in poor peelability and workability. On the other hand, if the initial peeling force is too low, the surface of the adhesive layer of the optical surface protective film may not be sufficiently protected, so it is preferably 0.2N / 50mm or more.

<Preparation of (meth) acrylic polymer (A)> 100 parts by weight of 2-ethylhexyl acrylate (2EHA), 4 parts by weight of 2-hydroxyethyl acrylate (HEA), and 2 as a polymerization initiator , 2'-Azobisisobutyronitrile (AIBN) 0.2 parts by weight and 205 parts by weight of ethyl acetate were fed into a 4-neck flask equipped with a stirring blade, a thermometer, a nitrogen introduction tube, and a cooler, and nitrogen was introduced while slowly stirring The temperature of the liquid in the flask was maintained at about 63 ° C., and a polymerization reaction was performed for about 4 hours to prepare a (meth) acrylic polymer (A) solution (about 35% by weight). The weight average molecular weight of the (meth) acrylic polymer (A) was 650,000, and Tg was -68 ° C.

<Preparation of (meth) acrylic polymer (B)> 95 parts by weight of butyl acrylate (BA), 5 parts by weight of acrylic acid (AA), and 2,2'-azobisisobutyl as a polymerization initiator 0.1 parts by weight of nitrile and 234 parts by weight of ethyl acetate were fed into a 4-necked flask equipped with a stirring blade, a thermometer, a nitrogen introduction tube, and a cooler. Nitrogen was introduced while slowly stirring, and the temperature of the liquid in the flask was maintained near 65 ° C. A polymerization reaction was performed for 6 hours to prepare a (meth) acrylic polymer (B) solution (30% by weight). The weight average molecular weight (Mw) of the (meth) acrylic polymer (B) was 1.1 million, and the glass transition temperature (Tg) was -47 ° C.

[Preparation of Acrylic Adhesive (1) Solution] The above (meth) acrylic polymer (A) solution (35% by weight) was diluted with ethyl acetate to 29% by weight, and 500 parts by weight of the solution (solid 100 parts by weight of components), 4 parts by weight of a trimeric isocyanate body (Coronate HX: C / HX, manufactured by Japan Polyurethane Co., Ltd.) of a trifunctional isocyanate compound, a diisocyanuric acid methyl ester, and a cross-linking agent were added. Parts (4 parts by weight of solid content), 1.5 parts by weight (0.015 parts by weight of solid content) of dibutyltin dilaurate ("Sn" in Table 2, 1% by weight ethyl acetate solution) as a crosslinking catalyst, While maintaining the temperature around 25 ° C., the mixture was stirred for about 1 minute to prepare an acrylic adhesive (1) solution.

[Preparation of solution of acrylic adhesive (2)] The above (meth) acrylic polymer (B) solution (30% by weight) was diluted with ethyl acetate to 29% by weight, and 500 parts by weight of the solution (solid 100 parts by weight of components), an epoxy-based crosslinking agent (1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, epoxy equivalent: 110, Number of functional groups: 4, Trade name "TETRAD-C": T / C, manufactured by Mitsubishi Gas Chemical Co., Ltd.) 6 parts by weight (6 parts by weight of solid content), followed by mixing and stirring to prepare an acrylic adhesive (2) solution .

[Preparation of solution of acrylic adhesive (3)] The above (meth) acrylic polymer (A) solution (35% by weight) was diluted with ethyl acetate to 29% by weight, and 500 parts by weight of the solution (solid To 100 parts by weight of components), an isocyanate-based crosslinking agent (a trimer isocyanate of fluorene methylene diisocyanate (trade name "Coronate HX"): C / HX, Japanese polyurethane as a crosslinking agent was added as a crosslinking agent. (Manufactured by the company) 5 parts by weight (5 parts by weight of solid content), 3 parts by weight of dibutyltin dilaurate (1% by weight ethyl acetate solution) as a crosslinking catalyst (0.03 parts by weight of solid content), and no additives Polyoxyalkylene-containing polyoxyalkylene chain compound (Aqualon HS-10, manufactured by Daiichi Kogyo Co., Ltd.) 0.3 parts by weight (solid content 0.3 parts by weight), and then mixed and stirred to prepare an acrylic adhesive (3) Solution.

〈Example 1〉 [Production of antistatic treatment film] 10 parts by weight of an antistatic agent (manufactured by Solvex, Micro-Solver RMd-142, containing tin oxide and polyester resin), and 30 parts by weight of water An antistatic agent solution was prepared by diluting with a mixed solvent composed of 70 parts by weight of methanol. The prepared antistatic agent solution was coated on a polyethylene terephthalate (PET) film (thickness: 38 μm) of the base film using a meyer bar, and then dried at 130 ° C. for 1 minute to remove The solvent was used to form an antistatic layer (thickness: 0.2 μm), thereby forming an antistatic film.

[Production of optical surface protective film with separator] The acrylic adhesive (1) solution was coated on the surface opposite to the antistatic surface of the antistatic film, and heated at 130 ° C for 2 minutes. An adhesive layer having a thickness of 15 μm was formed. Next, the silicone-treated separator Crisper K7211-50 μm (produced by Toyobo Co., Ltd., specific gravity of polyester-based substrate: 1.1 g / cm ³ , porosity of polyester-based substrate: 20%, thickness 50 μm) The silicone treated surface of) is adhered to the surface of the above-mentioned adhesive layer to form an optical surface protection film with a separator.

<Examples 2 to 5, Comparative Examples 1 to 4> As shown in Table 2, the acrylic adhesive (1) solution used in Example 1 was used, or an acrylic adhesive (2) solution or acrylic acid was used instead. The adhesive (3) solution was used, and except for the separators described in Table 3, an optical surface protective film with a separator was prepared in the same manner as in Example 1.

Regarding the optical surface protective films with separators in Examples and Comparative Examples, the above-mentioned blending contents, various measurement and evaluation results are shown in Tables 1 to 3. The blending amounts in the table indicate the active ingredients.

[Table 1]

[Table 2]

[table 3]

From Table 3 above, it can be confirmed that all examples have excellent peelability and workability, and prevent dents by setting the porosity and thickness of the polyester-based substrate constituting the separator to a desired range. . In addition, since no dent was generated on the surface of the adhesive layer in the examples, air bubbles are not entrained when attached to the adherend, and when inspection is performed while the optical surface protection film is attached to the adherend, Provides an optical surface protection film with excellent inspection properties. On the other hand, it was confirmed in Comparative Examples 1 to 3 that the porosity of the polyester-based substrate constituting the separator was not in the desired range, so the stiffness (rigidity) of the separator was strong, but the peelability and workability were poor; Comparative Example (4) It was confirmed that the thickness of the polyester-based substrate was not within the desired range, so that the cushioning property could not be exhibited, and dents caused by the separator were generated.

Industrial Applicability The optical surface protection film with separators disclosed here is suitable for manufacturing and transporting components for liquid crystal display panels, plasma display panels (PDP), and organic electroluminescence (EL) displays. The optical member used is used as a surface protective film for protecting the optical member. It is particularly useful as an optical surface protection film for optical components such as polarizing plates (polarizing films), wavelength plates, retardation plates, optical compensation films, brightness enhancement films, light diffusion sheets, and reflection sheets suitable for liquid crystal display panels.

1‧‧‧ Separation

2‧‧‧ Optical surface protection film

3‧‧‧ Optical Surface Protective Film with Separator

4‧‧‧ double-sided adhesive tape

5‧‧‧ glass

6‧‧‧ single-sided adhesive tape

11‧‧‧ Polyester based substrate

12‧‧‧ release layer

21‧‧‧Adhesive layer

22‧‧‧ substrate film

FIG. 1 is a schematic cross-sectional view showing a configuration example of an optical surface protective film with a separator according to the present invention. FIG. 2 is a schematic cross-sectional view showing a configuration example when the separator is peeled from the optical surface protective film with a separator of the present invention.

Claims (4)

An optical surface protection film with a separator, comprising an optical surface protection film and a separator. The optical surface protection film is an adhesive layer on at least one side of a substrate film, and the separator is located on the aforementioned substrate. The surface of the film that is in contact with the adhesive layer is the opposite surface; the optical surface protection film with a separator is characterized in that the separator has a release layer and a polyester-based substrate, and the polyester-based substrate has Holes, the thickness of the polyester-based substrate is 25 to 100 μm, and the 180 ° initial peel force of the separator to the adhesive layer is 0.7N / 50mm or less. For example, the optical surface protective film with a separator according to claim 1, wherein the polyester-based substrate has a porosity of 15% or more relative to the volume of the aforementioned polyester-based substrate. The optical surface protection film with a separator according to claim 1 or 2, wherein the aforementioned substrate film is a polyester film. The optical surface protection film with a separator according to any one of claims 1 to 3, wherein the aforementioned adhesive layer is formed of an adhesive composition containing a (meth) acrylic polymer.