TWI769207B - surface protection film - Google Patents

Abstract

The subject of the present invention is to provide an optical surface protective film with a separator, which is an optical surface protection film with a separator attached to the surface of the optical member after adjusting the position of the optical surface protective film with a separator by using an automatic laminating machine. In the case of the surface protection film for components, it has excellent positional adjustability by using the separator, and the surface protection film for optics can be attached at the correct position on the surface of the optical component.

The solution of the present invention is an optical surface protective film with a separating member, comprising an optical surface protective film and a separating member, the optical surface protective film is an adhesive layer on at least one side of a base film, and the The separating member is located on the opposite side of the adhesive layer that is in contact with the base film; the optical surface protection film with the separating member is characterized in that: the separating member has a release layer and a base material, and the separating member has a release layer and a base material. The haze is above 90%, and the total light transmittance is below 50%.

Description

surface protection film

The present invention relates to an optical surface protection film with a separator. In particular, it can be used to protect the surface of optical components (such as polarizers, wavelength plates, retardation plates, optical compensation films, reflective sheets, brightness enhancement films, etc.) It is useful to adjust the position of the surface of the optical member accurately, and to peel off the separator after the position adjustment, so that the surface protection film for optics can be attached to the surface of the optical member at the correct position.

Background Art A surface protective film generally has a structure in which an adhesive layer is provided on a film-like base film (support). The surface protection film is pasted on the optical member to be attached through the aforementioned adhesive layer, thereby protecting the surface of the optical member from scratches or contamination during processing, transportation, inspection, etc. for the purpose. use. For example, the panel of a liquid crystal display is formed by bonding optical members, such as a polarizing plate and a wavelength plate, to a liquid crystal cell through an adhesive layer. Until the adhesive layer is actually attached to the optical member, from the necessity of being protected from drying, etc., the adhesive layer is protected and stored by a release-treated separator or the like (Patent Document 1).

After that, after actually attaching the surface of the adhesive layer of the surface protection film to the optical member and using it, the surface protection film is peeled off and removed at an unnecessary stage.

Prior Art Documents Patent Documents Patent Document 1: Japanese Patent Laid-Open No. 2012-224811

Summary of Invention

The problem to be solved by the invention

In addition, when attaching the surface protection film with the separator on the surface of the optical member, in order to attach it at the correct position, only the surface protection film is cut into the desired size without cutting the separator, and after the separation A hole is opened on the outer surface of the piece, and the hole is sensed with a sensor and the position is adjusted with an automatic laminating machine, and then the separation piece is peeled off and then attached to the surface of the optical component.

However, even if the commonly used transparent surface protection film with a separator is used to adjust the position correctly on the optical member, the opening part cannot be correctly sensed and the deviation occurs, then the surface protection film with the separator is peeled off. When the parts are separated and attached to the optical member, problems such as not being able to be attached at the correct position occur, causing problems.

Therefore, the inventors of the present invention have made diligent studies in view of the above-mentioned circumstances, and an object thereof is to provide an optical surface protection film with a separator, which is used to adjust the optical surface with a separator against an optical member using an automatic laminating machine. When the position of the protective film is attached to the surface of the optical member after peeling off the separator, it has excellent positional adjustment using the separator, and can be attached at the correct position on the surface of the optical member.

means of solving problems

That is, the optical surface protective film with a separator of the present invention has an optical surface protective film and a separator, the optical surface protective film has an adhesive layer on at least one side of the base film, and the separator is located in The surface of the adhesive layer in contact with the base film is the opposite surface; the optical surface protection film with the separator is characterized in that: the separator has a release layer and a substrate, and the haze of the separator is Above 90%, and the total light transmittance is below 50%.

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

In the optical surface protection film with a separator of the present invention, the adhesive layer is preferably composed of an adhesive layer containing at least one adhesive selected from the group consisting of acrylic adhesives, urethane adhesives and polysiloxane adhesives. Formulation of the composition.

The present invention can produce the following optical surface protection film with the separation member by using the separation member with specific optical properties, which is useful: when using an automatic laminating machine to attach the optical surface protection film with the separation member to the optical surface protection film When the component surface adjusts the position and is attached to the surface of the optical component after peeling off the separator, it has excellent positional adjustability using the separator, and can be attached to the surface of the optical component at the correct position.

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

<The overall structure of the optical surface protective film with a separator> The optical surface protective film with a separator disclosed here (hereinafter, it may only be referred to as a "surface protective film".) is generally referred to as an adhesive The surface of the adhesive layer in the form of tape, adhesive label, and adhesive film is protected by a separator, and it is especially suitable for processing, inspection, and transportation of optical parts (such as polarizers, wave plates, etc.) as components of liquid crystal display panels. Optical parts) surface protective film to protect the surface of optical parts. The adhesive layer of the aforementioned surface protection film is typically formed continuously, but is not limited to this form, and may also be an adhesive layer that forms regular or random patterns such as dots and stripes. Moreover, the surface protective film disclosed here may be in a roll shape or a single sheet shape.

<Substrate film> The surface protective film for optics with a separator of the present invention is characterized by having a substrate film. In the technique disclosed herein, the resin material constituting the base film can be used without particular limitation, but for example, transparency, mechanical strength, thermal stability, moisture resistance, isotropy, flexibility, size, etc. are preferably used. Those with excellent characteristics such as stability. In particular, since the base material has flexibility, it is useful that the adhesive composition can be applied by a roll coater or the like and can be wound into a roll shape.

As the aforementioned base film (support), a plastic film composed of the following resin materials such as polyethylene terephthalate (PET), polyethylene terephthalate (PET), polyethylene terephthalate (PET), polyethylene terephthalate (PET), Polyester-based polymers such as ethylene naphthalate (PEN), polybutylene terephthalate, etc.; cellulose-based polymers such as diacetyl cellulose, triacetyl cellulose, etc.; polycarbonate-based polymers An acrylic polymer such as polymethyl methacrylate or the like is the main resin component (the main component among the resin components is typically a component occupying 50% by weight or more). Other examples of the aforementioned resin materials include the following as resin materials: styrene-based polymers such as polystyrene and acrylonitrile-styrene copolymer; polyethylene, polypropylene, and polymers having a cyclic or norbornene structure. Olefin-based polymers of olefins, ethylene-propylene copolymers, etc.; vinyl chloride polymers; amide-based polymers of nylon 6, nylon 6,6, aromatic polyamides, etc.; etc. Still other examples of the above-mentioned resin material include imide-based polymers, ethylene-based polymers, polyether-based polymers, polyetheretherketone-based polymers, polyphenylene sulfide-based polymers, vinyl alcohol-based polymers, Vinylidene chloride-based polymers, vinyl butyral-based polymers, arylate-based polymers, polyoxymethylene-based polymers, epoxy-based polymers, and the like. A base film composed of a mixture of two or more of the above polymers may also be used.

As the aforementioned base film, a plastic film composed 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 based on polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate, or the like The polyester-based polymer material (polyester resin) is used as the main resin component. The polyester film has excellent optical properties and dimensional stability and other preferable properties as a base film of a surface protective film.

Various additives such as antioxidants, ultraviolet absorbers, plasticizers, colorants (pigments, dyes, etc.) can also be blended into the resin material constituting the aforementioned base film as required. Well-known or conventional surface treatments such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, application of a primer and the like can be applied. The surface treatment can be used to improve, for example, the adhesion between the base film and the adhesive layer (anchoring property of the adhesive layer).

The aforementioned base film can also be a plastic film with antistatic treatment. By using the above-mentioned base film, the self-charging can be suppressed when the surface protective film is peeled off, which is preferable. In addition, the base film is a plastic film, and by applying antistatic treatment to the plastic film, the charging of the surface protection film itself can be reduced, and an excellent antistatic ability to the attached body can be obtained. In addition, the method for imparting antistatic function is not particularly limited, and well-known methods can be used. The method of resin, or the method of vapor deposition or electroplating of a conductive material, and the method of mixing an antistatic agent, etc. can also be mentioned.

The thickness of the aforementioned base film is usually 5 to 200 μm, preferably about 10 to 100 μm. When the thickness of the aforementioned base film is within the aforementioned range, it is preferable because the workability of sticking to the adherend and the peelability or workability of peeling from the adherend are excellent.

The surface protective film disclosed herein can be obtained by implementing it in a form including other layers in addition to the base film, the adhesive layer, and the separator. As said other layer, the primer layer (anchor layer) etc. which improve the anchoring property of an antistatic layer or an adhesive layer are mentioned.

<Adhesive Layer> The adhesive used in the present invention can be used without any particular limitation as long as it is formed of an adhesive composition containing an adhesive polymer having adhesive properties. The aforementioned adhesive composition can be, for example, acrylic adhesives, urethane adhesives, synthetic rubber adhesives, natural rubber adhesives, polysiloxane adhesives, polyester adhesives, etc. (Containing) at least one selected from the group consisting of acrylic adhesives, urethane adhesives and polysiloxane adhesives is preferable, and it is especially preferable to use ( Adhesive composition of meth)acrylic polymer.

When an acrylic adhesive is used for the adhesive layer, the (meth)acrylic polymer constituting the adhesive polymer of the acrylic adhesive can be a (meth)acrylic monolayer having an alkyl group having 1 to 14 carbon atoms. The body is used as the main monomer as the raw material for its composition. As for the said (meth)acrylic-type monomer, 1 type or 2 or more types can be used. By using the (meth)acrylic monomer having the aforementioned alkyl group having 1 to 14 carbon atoms, the peeling force (adhesive force) to the adherend (protected body) can be easily controlled to be low, and light weight can be obtained. Surface protection film with excellent peelability or repeelability. In addition, the (meth)acrylic polymer in the present invention refers to an acrylic polymer and/or a methacrylic polymer, and the (meth)acrylate refers to an acrylate and/or a methacrylate .

Specific examples of the (meth)acrylic monomer containing an alkyl group having 1 to 14 carbon atoms include methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, and (meth)acrylate. base) tertiary butyl acrylate, tertiary butyl (meth)acrylate, isobutyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, (meth)acrylate ) n-octyl acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate , n-dodecyl (meth)acrylate, n-tridecyl (meth)acrylate, n-tetradecyl (meth)acrylate, etc.

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

In particular, with respect to 100% by weight of the total amount of the monomer components constituting the (meth)acrylic polymer, it is preferable to use (meth)acrylic monomers containing 65% by weight or more of alkyl groups having 1 to 14 carbon atoms, It is preferably 75% by weight or more, more preferably 85 to 99.9% by weight, and most preferably 90 to 99% by weight. If it is less than 65% by weight, the moderate wettability of the adhesive composition and the cohesive force of the adhesive layer will deteriorate, which is not preferable.

Moreover, the said (meth)acrylic-type polymer can use the (meth)acrylic-type monomer containing a hydroxyl group as a raw material monomer. As for the said hydroxyl-containing (meth)acrylic-type monomer, 1 type or 2 or more types can be used. By using the above-mentioned hydroxyl-containing (meth)acrylic monomer, the crosslinking of the adhesive composition can be easily controlled, and the improvement of wettability by flow and the reduction of peeling force (adhesive force) during peeling can be more easily controlled. 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, etc.

The amount of the hydroxyl group-containing (meth)acrylic monomer is preferably 25% by weight or less, preferably 15% by weight, relative to 100% by weight of the total amount of monomer components constituting the (meth)acrylic polymer. Hereinafter, it is more preferably 0.1 to 10% by weight. Within the aforementioned range, the balance between the wettability of the adhesive composition and the cohesive force of the obtained adhesive layer can be easily controlled, which is preferable.

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

Moreover, the said (meth)acrylic-type polymer can use the (meth)acrylic-type monomer containing a carboxyl group as a raw material monomer. By using the above-mentioned carboxyl-containing (meth)acrylic monomer, the increase in the adhesive force of the adhesive layer (surface protective film) over time can be suppressed, and the re-peelability, the increase in the anti-adhesion force, and the workability can be improved. Excellent. Moreover, in addition to being excellent in the cohesion force of an adhesive layer, it is also excellent in shearing force, and it is preferable.

As the said carboxyl group-containing (meth)acrylic monomer, (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, etc. are mentioned, for example.

With respect to 100% by weight of the total amount of monomer components constituting the (meth)acrylic polymer, the above-mentioned carboxyl group-containing (meth)acrylic monomer is preferably 10% by weight or less, more preferably 0 to 8% by weight, More preferably, it is 0 to 6% by weight. Within the aforementioned range, the balance between the wettability of the adhesive composition and the cohesive force of the obtained adhesive layer can be easily controlled, which is preferable.

In addition, other polymerizable monomers other than the above-mentioned raw material monomers can be used for the (meth)acrylic-based polymer without any particular limitation as long as the characteristics of the present invention are not impaired. For example, as the aforementioned other polymerizable monomers, components that improve cohesion and heat resistance, such as cyano group-containing monomers, vinyl ester monomers, aromatic vinyl monomers, etc., or amide group-containing monomers, amide-imide group-containing monomers, etc. can be suitably used. , Amine-containing monomers, epoxy-containing monomers, N-acryloyl morpholine, vinyl ether-based monomers, etc. have a combination of functional groups that improve peeling force (adhesion) and can act as a cross-linking base point. Element. Among them, nitrogen-containing monomers such as cyano group-containing monomers, amide group-containing monomers, amide imine group-containing monomers, amine group-containing monomers and N-acryloyl morpholine are preferably used. By using a nitrogen-containing monomer, a suitable peeling force (adhesion force) such as no embossing or peeling can be ensured, and a surface protection film excellent in shearing force can be obtained, which is useful. One or more of these polymerizable monomers can be used.

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

Examples of the aforementioned amide 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-dimethylaminopropyl methacrylamide, diacetone acrylamide, etc.

Examples of the above-mentioned imide group-containing monomer include cyclohexylmaleimide, isopropylmaleimide, N-cyclohexylmaleimide, iconimide, and the like.

The aforementioned amino group-containing monomers include, for example, aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl ( meth)acrylate, etc.

As said vinyl ester monomer, vinyl acetate, vinyl propionate, vinyl laurate, etc. are mentioned, for example.

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

As said epoxy group-containing monomer, glycidyl (meth)acrylate, methylglycidyl (meth)acrylate, allylglycidyl ether, etc. are mentioned, for example.

As said vinyl ether monomer, methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, etc. are mentioned, for example.

In the present invention, the other polymerizable monomers are preferably 0 to 30% by weight, more preferably 0 to 10% by weight, relative to 100% by weight of the total amount of monomer components constituting the (meth)acrylic polymer. The aforementioned other polymerizable monomers can be appropriately adjusted in order to obtain desired properties.

The said (meth)acrylic-type polymer may further contain the reactive monomer containing an epoxy group as a monomer component.

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

The above-mentioned reactive monomers containing an epoxy group may be used alone or in combination of two or more, but the overall content is preferably in the total amount of the monomer components of the (meth)acrylic polymer. 0 to 20% by weight, preferably 0 to 10% by weight. If the content of the alkylene oxide-containing reactive monomer exceeds 20% by weight, the contamination to the attached body will deteriorate, which is not preferable.

Examples of the oxyalkylene unit of the above-mentioned alkylene oxide-containing reactive monomer include those having an alkylene group having 1 to 6 carbon atoms, for example, oxymethylene, oxyethylidene, oxypropylidene, and oxymethylene group. Butyl, etc. The hydrocarbon group of the oxyalkylene chain may be straight or branched.

Moreover, it is more preferable that the said reactive monomer containing an epoxy group is the reactive monomer which has an epoxy group. By using a reactive monomer-containing (meth)acrylic polymer having an epoxy 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 inhibit the adhesion of the ethylene oxide. body exudation to obtain a low-polluting adhesive composition.

Examples of the above-mentioned reactive monomers containing an alkylene oxide group include (meth)acrylic acid alkylene oxide adducts, or reactions having reactive substituents such as acrylyl group, methacrylyl group, and allyl group in the molecule. surfactants, etc.

Specific examples of the above-mentioned (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, ethoxypolyethylene glycol (meth)acrylate Ethylene glycol (meth)acrylate, butoxy polyethylene glycol (meth)acrylate, octoxy polyethylene glycol (meth)acrylate, lauryloxy polyethylene glycol (meth)acrylic acid ester, stearyloxy polyethylene glycol (meth)acrylate, phenoxy polyethylene glycol (meth)acrylate, methoxypolypropylene glycol (meth)acrylate, octyloxy polyethylene glycol - Polypropylene glycol (meth)acrylate, etc.

Further, specific examples of the reactive surfactant include, for example, anionic reactive surfactants having a (meth)acryloyl group or an allyl group, nonionic reactive surfactants, and cationic reactive surfactants. agent, etc.

The weight-average molecular weight (Mw) of the aforementioned (meth)acrylic polymer is preferably 100,000 to 5 million, preferably 200,000 to 4 million, more preferably 300,000 to 3 million, and most preferably 300,000 to 120 Ten thousand. When the weight-average molecular weight is less than 100,000, the cohesive force of the adhesive layer tends to be reduced, and residues tend to be generated. On the other hand, when the weight average molecular weight exceeds 5 million, the fluidity of the polymer will decrease, the wetting of the adherend (such as a polarizing plate) will become insufficient, and there will be an adhesive between the adherend and the surface protective film. The tendency to cause swelling between layers. In addition, the weight average molecular weight refers to what is measured by GPC (gel permeation chromatography, gel permeation chromatography).

Moreover, the glass transition temperature (Tg) of the said (meth)acrylic-type 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 flow easily, so that, for example, the wetting of the polarizing plate, which is an optical member, becomes insufficient, which causes expansion between the polarizing plate and the adhesive layer of the surface protection film. Propensity. In particular, the glass transition temperature is preferably set to -40°C or lower, preferably -70°C or lower, and an adhesive layer excellent in wettability to polarizing plates and light peeling properties can be easily obtained. Moreover, the glass transition temperature of a (meth)acrylic-type polymer can be adjusted in the said range by suitably changing the monomer component or composition ratio used.

The polymerization method of the aforementioned (meth)acrylic polymer is not particularly limited, and the polymerization can be carried out by well-known methods such as solution polymerization, emulsion polymerization, bulk polymerization, and suspension polymerization. In terms of properties such as low contamination properties (to be protected), solution polymerization is a preferable aspect. In addition, the obtained polymer may be any of random copolymers, block copolymers, alternating copolymers, graft copolymers, and the like.

When a urethane-based adhesive is used for the aforementioned adhesive layer, any appropriate urethane-based adhesive can be used. As such a urethane type adhesive, the thing which consists of the urethane type polymer of the adhesive polymer obtained by making a polyol and a polyisocyanate compound react is mentioned preferably. As a polyol, polyether polyol, polyester polyol, polycarbonate polyol, polycaprolactone polyol, etc. are mentioned, for example. As a polyisocyanate compound, diphenylmethane diisocyanate, tolyl diisocyanate, hexamethylene diisocyanate, etc. are mentioned, for example.

When a polysiloxane-based adhesive is used in the aforementioned adhesive layer, any appropriate polysiloxane-based adhesive can be used. As such polysiloxane-based adhesives, those obtained by mixing or agglomerating polysiloxane-based polymers of adhesive polymers are preferably used.

In addition, the above-mentioned polysiloxane-based adhesive may be an addition reaction-curable polysiloxane-based adhesive or a peroxide-curable polysiloxane-based adhesive. Among these polysiloxane-based adhesives, since no peroxide (benzyl peroxide, etc.) is used and no decomposition products are produced, addition reaction-curable polysiloxane-based adhesives are preferred.

The hardening reaction of the above-mentioned addition reaction hardening type polysiloxane-based adhesive, for example, when a polysiloxane-based adhesive is to be prepared, a method of hardening the polyalkylhydrosiloxane composition by a platinum catalyst is generally used. .

<Oxygen-containing alkylene compound> The adhesive composition used in the present invention may contain an oxygen-containing alkylene compound. By containing an oxygen-containing alkylene compound, light peeling properties can be further exhibited. As the oxygen-containing alkylene compound, an organopolysiloxane having an oxygen-alkylene chain or an oxygen-containing alkylene compound not containing an organopolysiloxane can be exemplified.

Taking the specific example of the organopolysiloxane having an oxyalkylene chain as described above, as a specific example of the organopolysiloxane having an oxyalkylene chain in the main chain, for example, a commercial product under the trade name X- 22-4952, X-22-4272, X-22-6266, KF-6004, KF-889 (the above are manufactured by Shin-Etsu Chemical Co., Ltd.), BY16-201, SF8427 (the above are manufactured by Toray·Dow Corning Co., Ltd.), IM22 (manufactured by Asahi Kasei Wacker Co., Ltd.), etc. In addition, as a specific example of the organopolysiloxane having an oxyalkylene chain in the side chain, for example, commercially available trade 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 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 (the above are 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 (manufactured by BYK-Chemie Japan), and the like. These compounds may be used alone or in combination of two or more.

Specific examples of the aforementioned organopolysiloxane-containing oxygen-containing alkylene compounds include, for example, polyoxyalkylene alkylamines, polyoxyalkylene diamines, polyoxyalkylene fatty acid esters, polyoxyalkylene alkylenes. Alkyl sorbitan fatty acid ester, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl allyl ether, polyoxyalkylene alkyl phenylene Nonionic surfactants such as propyl ether; polyoxyalkylene alkyl ether sulfate, polyoxyalkylene alkyl ether phosphate, polyoxyalkylene alkyl phenyl ether sulfate, polyoxyalkylene alkyl Anionic surfactants such as oxyalkylene alkyl phenyl ether phosphate salts; in addition, there are cationic surfactants or zwitterionic surfactants with polyoxyalkylene chains (polyoxyalkylene chains) , Polyether compounds with polyoxyalkylene chains (and derivatives thereof), acrylic compounds with polyoxyalkylene chains (and derivatives thereof), etc. In addition, a polyoxyalkylene chain-containing monomer may be blended as a polyoxyalkylene chain-containing compound. The polyoxyalkylene group-containing compound may be used alone or in combination of two or more.

Specific examples of the polyether-based compound (polyether component) having a polyoxyalkylene chain include polypropylene glycol (PPG)-polyethylene glycol (PEG) block copolymers, and blocks of PPG-PEG-PPG Copolymers, block copolymers of PEG-PPG-PEG, etc. Derivatives of the aforementioned polyether-based compounds having a polyoxyalkylene chain include oxygenated propylidene compounds (PPG monoalkyl ethers, PEG-PPG monoalkyl ethers, etc.) whose ends are etherified, Oxygenated propylidene compounds (terminal acetylated PPG, etc.), etc.

Moreover, as the acrylic compound which has the said polyoxyalkylene chain, the (meth)acrylic-type polymer which has an oxyalkylene group is mentioned. As the aforementioned oxyalkylene group, the number of added molars of the oxyalkylene group unit is preferably 1 to 50, preferably 2 to 30, and more preferably 2 to 20. In addition, the terminal of the aforementioned 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 the aforementioned (meth)acrylic acid alkylene oxide as a specific example, Examples of the ethylene glycol group-containing (meth)acrylate include methoxy-diethylene glycol (meth)acrylate, methoxy-triethylene glycol (meth)acrylate, and the like. - Polyethylene glycol (meth)acrylate type, ethoxy-polyethylene glycol (meth)acrylate, ethoxy-triethylene glycol (meth)acrylate, etc. Diol (meth)acrylate type, butoxy-polyethylene glycol (butoxy-diethylene glycol (meth)acrylate, butoxy-triethylene glycol (meth)acrylate, etc. Meth)acrylate type, phenoxy-polyethylene glycol (meth)acrylate, 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, other monomer components other than the said (meth)acrylic-acid alkylene oxide may be used as said monomer component. Specific examples of other monomer components include methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, tertiary butyl (meth)acrylate, and tributyl (meth)acrylate. Grade butyl ester, 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 a carbon number of 1 to 14, such as n-tridecyl meth)acrylate and n-tetradecyl (meth)acrylate.

In addition, carboxyl group-containing (meth)acrylates, phosphoric acid group-containing (meth)acrylates, cyano group-containing (meth)acrylates, vinyl esters, aromatic vinyl compounds, and acid anhydrides can also be appropriately used (meth)acrylates containing amine groups, (meth)acrylates containing hydroxyl groups, (meth)acrylates containing amide groups, (meth)acrylates containing amine groups, (meth)acrylates containing epoxy groups ) acrylate, N-acryloyl morpholine, vinyl ethers, etc. as other monomer components other than the aforementioned (meth)acrylic acid alkylene oxide.

As a preferred aspect, the aforementioned organopolysiloxane-free polyoxyalkylene chain-containing compound is a compound having at least a part of (poly) oxirane chain. By blending the aforementioned (poly) oxirane chain-containing compound, the compatibility with the base polymer can be improved, the exudation of the adherend can be suppressed well, and an adhesive composition with low pollution can be obtained. In particular, when a block copolymer of PPG-PEG-PPG is used, an adhesive with excellent low pollution property can be obtained. As the aforementioned polyoxyethylene chain-containing compound, the weight of the (poly)oxyethylene chain in the aforementioned polyoxyalkylene chain-containing compound without organopolysiloxane is preferably 5 to 90% by weight, preferably It is 5 to 85% by weight, more preferably 5 to 80% by weight, and most preferably 5 to 75% by weight.

In addition, the commercial products of the aforementioned organopolysiloxane-containing polyoxyalkylene-containing chain compounds include, for example, Adeka Pluonic 17R-4, Adeka Pluonic 25R-2 (all of which are manufactured by ADEKA); Latemul PD-420 , Latemul PD-420, Latemul PD-450, Emulgen 120 (manufactured by Kao Corporation); Aqualon HS-10, KH-10, Noigen EA-87, EA-137, EA-157, EA-167, EA-177 (above manufactured by Daiichi Industrial Pharmaceutical Co., Ltd.), etc.

The content of the aforementioned oxygen-containing alkylene compound is relative to the adhesive polymer (main polymer, such as (meth)acrylic polymer, urethane polymer, polysiloxane, etc.) constituting the aforementioned adhesive composition. 100 parts by weight, preferably 0.01 to 5 parts by weight, 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. Within the aforementioned range, the light peelability (repeelability) of the adhesive layer (surface protective film) used in the present invention can be easily exhibited, which is preferable.

<Crosslinking agent> In the surface protection film of the present invention, the adhesive composition preferably contains a crosslinking agent. Moreover, in this invention, the said adhesive composition can be used as an adhesive layer. For example, when the aforementioned adhesive composition is an acrylic adhesive containing the aforementioned (meth)acrylic polymer, the constituent units, constituent ratios, and crosslinking agents of the aforementioned (meth)acrylic polymer can be adjusted appropriately. By selecting, adding ratio, etc., and performing crosslinking, an adhesive layer (surface protective film) with more excellent heat resistance can be obtained.

As the crosslinking agent used in the present invention, isocyanate compounds, epoxy compounds, melamine-based resins, aziridine derivatives, and metal chelate compounds can be used, and it is particularly preferable to use isocyanate compounds or epoxy compounds. In addition, these compounds may be used individually or in mixture of 2 or more types.

二

三酮鍵等將前述異氰酸酯化合物進行改質所得之聚異氰酸酯改質體。市售品可列舉例如商品名Takenate 300S、Takenate 500、Takenate 600、Takenate D165N、Takenate D-178N(以上為武田藥品工業公司製)；Sumidur T80、Sumidur L、Desmodur N3400 (以上為住化Bayer Urethane公司製)；Millionate MR、Millionate MT、Coronate L、Coronate HL、Coronate HX(以上為日本聚胺甲酸乙酯工業公司製)等。該等異氰酸酯化合物可單獨使用，亦可混合2種以上使用，亦可將雙官能之異氰酸酯化合物與三官能以上之異氰酸酯化合物併用來使用。藉由併用交聯劑可使黏著性與耐反彈性(對於曲面的接著性)並存，而可獲得接著信耐性更優異的黏著劑層(表面保護薄膜)。Examples of the isocyanate compound include aliphatic polyisocyanates such as trimethylene diisocyanate, butylene diisocyanate, hexamethylene diisocyanate (HDI), and diisocyanate; cyclopentylene Alicyclic isocyanates such as diisocyanate, cyclohexylene diisocyanate, isophorone diisocyanate (IPDI), 1,3-bis(isocyanatomethyl)cyclohexane, etc.; 2,4-toluene diisocyanate , 4,4'-diphenylmethane diisocyanate, stubble diisocyanate (XDI) and other aromatic isocyanates; by allophanate bond, biuret bond, trimer isocyanate bond, uretdione bond, urea bond, carbodiimide bond, uretonimine bond and

two

A modified polyisocyanate obtained by modifying the aforementioned isocyanate compound with a triketone bond or the like. Commercially available products include, for example, trade names Takenate 300S, Takenate 500, Takenate 600, Takenate D165N, and Takenate D-178N (the above are manufactured by Takeda Pharmaceutical Co., Ltd.); made); Millionate MR, Millionate MT, Coronate L, Coronate HL, Coronate HX (the above are manufactured by Japan Polyurethane Industry Co., Ltd.), etc. These isocyanate compounds may be used alone, or two or more of them may be used in combination, or a bifunctional isocyanate compound and a trifunctional or higher isocyanate compound may be used in combination. By using a crosslinking agent in combination, the adhesiveness and rebound resistance (adhesion to a curved surface) can be coexisted, and an adhesive layer (surface protection film) with more excellent adhesion resistance can be obtained.

Examples of the epoxy compound include N,N,N',N'-tetraglycidyl-m-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.

As said melamine type-resin, hexamethylol melamine etc. are mentioned. Examples of the aziridine derivatives include commercially available trade names HDU, TAZM, and TAZO (the above are manufactured by Mutual Pharmaceutical Co., Ltd.).

As the metal chelate compound, aluminum, iron, tin, titanium, nickel, etc. are mentioned as the metal component, and acetylene, methyl acetoacetate, ethyl lactate, etc. are mentioned as a chelate component.

The content of the crosslinking agent used in the present invention is preferably 0.01 to 20 parts by weight, preferably 0.1 to 15 parts by weight, more preferably 0.5 to 10 parts by weight relative to 100 parts by weight of the aforementioned (meth)acrylic polymer. parts, preferably 1 to 8 parts by weight. When the aforementioned content is less than 0.01 parts by weight, the formation of cross-linking by the cross-linking agent may be insufficient, resulting in a decrease in the cohesive force of the obtained adhesive composition, so that sufficient heat resistance cannot be obtained. The tendency to cause glue residue. On the other hand, when the content exceeds 20 parts by weight, the cohesion of the polymer will increase and the fluidity will decrease, and the wetting of the adherend (such as polarizer) will be insufficient, which may cause the adhesion between the adherend and the adhesive layer. Tendency to cause swelling between (adhesive composition layers). In addition, these crosslinking agents may be used alone or in combination of two or more.

<Cross-Linking Catalyst> The above-mentioned adhesive composition may further contain a cross-linking catalyst for making any of the above-mentioned cross-linking reactions proceed more efficiently. For the cross-linking catalyst, tin-based catalysts such as dibutyltin dilaurate, dioctyltin dilaurate, etc.; ginseng (heptane-2,4-dione) iron, ginseng (heptane-3,5-dione) iron, ginseng (5-methylhexyl-2,4-dione) iron, ginseng (octane-2,4 -Diketone) iron, ginseng (6-methylhept-2,4-dione) iron, ginseng (2,6-dimethylhept-3,5-dione) iron, ginseng (nonan-2,4 -Diketone) iron, ginseng (nonan-4,6-dione) iron, ginseng (2,2,6,6-tetramethylhept-3,5-dione) iron, ginseng (tridecane-6 ,8-dione)iron, ginseng(1-phenylbutan-1,3-dione)iron, ginseng(hexafluoroacetone)iron, ginseng(ethyl acetate)iron, ginseng(acetylacetate)iron - n-Propyl acetate) iron, ginseng (acetyl isopropyl acetate) iron, ginseng (acetyl acetate - n-butyl ester) iron, ginseng (acetyl acetate - secondary butyl ester) iron, ginseng (acetyl acetate - tributyl) Butyl) iron, ginseng (methyl propionyl acetate) iron, ginseng (propionyl acetate ethyl acetate) iron, ginseng (propionyl acetate-n-propyl ester) iron, ginseng (isopropyl propionyl acetate) iron , ginseng (propyl acetate - n-butyl) iron, ginseng (propyl acetate - tertiary butyl ester) iron, ginseng (propyl acetate - tertiary butyl ester) iron, ginseng (acetyl benzyl acetate) iron, ginseng (Dimethyl malonate) iron, ginseng (diethyl malonate) iron, trimethoxy iron, triethoxy iron, triisopropoxy iron, iron (III) chloride, etc. media. These catalysts may be used alone or in combination of two or more.

The content of the crosslinking catalyst is not particularly limited, but is preferably 0.0001 to 1 part by weight, preferably 0.001 to 0.5 part by weight, relative to 100 parts by weight of the (meth)acrylic polymer, for example. Within the aforementioned range, the speed of the cross-linking reaction when the adhesive layer is formed is high, and the usable life of the adhesive composition becomes longer, which is a preferable aspect.

In addition, other well-known additives may also be contained in the aforementioned adhesive composition, for example, powders such as lubricants, colorants, and pigments can be appropriately added according to the application; plasticizers, adhesion imparting agents, low molecular weight polymers, Surface lubricants, levelers, antioxidants, anticorrosion agents, light stabilizers, UV absorbers, polymerization inhibitors, silane coupling agents, antistatic agents, inorganic or organic fillers, metal powders, particles, foils, etc. .

<The optical surface protective film with a separator> The optical surface protective film (surface protective film) with a separator of the present invention is obtained by forming the aforementioned adhesive layer on at least one side of the base film, and in this case, Generally, the cross-linking of the adhesive composition is performed after the adhesive composition is applied, but the adhesive layer composed of the cross-linked adhesive composition can also be transferred to a substrate film or the like.

In addition, the method for forming the adhesive layer on the base film is not particularly limited. For example, the above-mentioned adhesive composition (solution) can be coated on the base film, and the polymerization solvent or the like can be dried and removed to form the base film. It is produced by forming an adhesive layer on the film. Thereafter, curing may be performed for adjustment of the transfer of the adhesive layer components, adjustment of the cross-linking reaction, and the like. In addition, when the adhesive composition is coated on the base film to produce a surface protection film, one or more solvents other than the polymerization solvent may be newly added to the above-mentioned adhesive composition, so that it can be uniformly coated on the adhesive composition. on the substrate film.

Moreover, as a method of forming an adhesive layer at the time of manufacturing the surface protection film of this invention, the method for manufacturing a well-known adhesive tape etc. can be used. Specifically, for example, roll coating, gravure coating, reverse roll coating, roll brushing, spray coating, air knife coating method, extrusion coating method using a die coater, etc. are mentioned.

In the surface protection film of the present invention, the thickness of the aforementioned adhesive layer is usually 3 to 100 μm, and preferably about 5 to 50 μm. If the thickness of the adhesive layer is within the aforementioned range, it is possible to easily achieve a suitable balance between re-peelability and adhesiveness, which is preferable.

In addition, the total thickness of the surface protective film of the present invention is preferably 8-300 μm, more preferably 10-200 μm, and most preferably 20-100 μm. Within the above-mentioned range, the adhesive properties (removability, adhesiveness, etc.), workability, and appearance properties are excellent, which is a preferable aspect. In addition, the said total thickness means the sum total of the thickness of all layers including a base film, an adhesive bond layer, a separator, and other layers.

<Separate part>

The surface protection film of the present invention is a substrate film with an adhesive layer on at least one side, and a separator on the opposite side of the adhesive layer in contact with the substrate film; the surface protection film is characterized by: : The separation part has a release layer and a base material, the haze of the separation part is above 90%, and the total light transmittance is below 50%. The aforesaid separators are attached to the surface of the adhesive layer in order to protect the adhesive surface of the adhesive layer. Especially, the separators have optical properties such as specific haze and total light transmittance, so they can be used in the optical properties of the attached separators. It is preferable to carry out the position adjustment on the optical member with the surface protective film, and stick (laminate) the optical surface protective film with the separator peeled off on the surface of the optical member after the position adjustment.

The haze of the aforementioned separating piece is above 90%, and the total light transmittance is below 50% (0~50%), preferably the haze is above 92%, and the total light transmittance is 5~50%, more preferably The haze is 94% or more and the total light transmittance is 8 to 48%, and the haze is 96% or more and the total light transmittance is 10 to 45%. Since the haze of the separator is more than 90% and the total light transmittance is less than 50%, the optical surface protection film with the separator can have excellent position adjustment on the surface of the optical member, and can be used after the position adjustment. It is a preferable aspect that the peeling separator can be attached to the surface of the optical member in a correct position. In particular, the total light transmittance is 50% or less (0~50%), preferably 48% or less, preferably 45% or less, more preferably 40% or less, especially 30% or less. Due to the low total light transmittance, the position of the optical surface protection film with the separator on the surface of the optical member can be easily adjusted, and it has excellent position adjustment and workability, which is ideal.

<Substrate> The aforementioned substrate can be suitably used for paper or plastic film. The film is not particularly limited as long as it can protect the above-mentioned adhesive layer, for example, polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, Vinyl chloride copolymer film, polyethylene terephthalate film, polyethylene naphthalate film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film etc., in particular, polyethylene terephthalate (PET) films, polyethylene naphthalate films, polybutylene terephthalate films, etc., which use polyester-based films, are preferred.

The method for adjusting the haze of the separator to 90% or more and the total light transmittance to 50% or less is not particularly limited, and a well-known method can be used. It can be prepared by adding holes, adding coloring materials, and roughening the surface of the base material. Specifically, the method described in Japanese Patent Application Laid-Open No. 9-12759, etc. can be mentioned.

The thickness of the aforementioned substrate is usually 5 to 200 μm, preferably about 10 to 100 μm. Within the aforementioned range, it is preferable to have excellent adhesion workability to the adhesive layer, peelability and workability of the separator to the adhesive layer.

Various surface treatments such as corona discharge treatment or various surface treatments such as embossing can be applied to the surface of the aforementioned substrate as required. Fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, UV absorbers, antistatic agents, lubricants, plasticizers, colorants (pigments, dyes, etc.) can also be blended as required. various additives.

Commercially available products of the aforementioned substrates include, for example, DIAFOIL W100, DIAFOIL W400 (above, manufactured by Mitsubishi Plastics Corporation), Lumirror #50-EA3S (manufactured by TORAY INDUSTRIES, INC.), CQ952 (manufactured by KOLON Corporation), and the like.

<Mold release layer> The said mold release layer has adhesiveness with respect to the said base material, and has peelability with respect to the said adhesive bond layer, and can be formed from a mold release agent composition. The above-mentioned mold release agent composition is not particularly limited, such as polysiloxane compounds such as dimethylsiloxane or diphenylsiloxane; long-chain alkyl groups such as polysiloxane resin, fluororesin, ASHIO RESIN, etc. can be used compounds, etc.

In addition, other well-known additives may also be contained in the aforementioned release agent composition, for example, powders of antistatic agents, colorants, pigments, etc. can be appropriately added according to the application; surfactants, plasticizers, adhesion imparting agents , low molecular weight polymers, surface lubricants, leveling agents, antioxidants, anticorrosion agents, light stabilizers, ultraviolet absorbers, polymerization inhibitors, silane coupling agents, inorganic or organic fillers, metal powders, particles, etc.

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

The method of forming the mold release layer on the substrate is not particularly limited, for example, the mold release layer can be formed on the substrate by coating the solution of the aforementioned mold release agent composition on the substrate, and drying and removing the polymerization solvent, etc. to make. Thereafter, curing may be performed for adjustment of the transfer of the mold release layer components, and the like. In addition, when the release agent composition is applied on the base material to form a release layer, one or more solvents other than the polymerization solvent may be newly added to the release agent composition to enable uniform application. on the substrate.

Moreover, as the formation method of the said mold release layer, the method for well-known mold release layer manufacture can be used. Specifically, for example, roll coating, gravure coating, reverse roll coating, roll brushing, spray coating, air knife coating method, extrusion coating method using a die coater, etc. are mentioned.

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 mold release layer is too small, it may become difficult to peel off the separation member, and thus, the lamination operation of the optical surface protection film may become difficult. On the other hand, if it is too thick, the contamination of the adhesive layer of the optical surface protection film may be affected.

As a commercial item of the said separator, for example, Crisper K7211-50 micrometer, Crisper K7211-38 micrometer, Crisper K7011-50 micrometer, Crisper K7011-38 micrometer (above, the Toyobo company make) etc. are mentioned, for example.

<Attachment of the optical surface protective film and the separator (production of the optical surface protective film with the separator)> The form of the optical surface protective film with the separator of the present invention is to attach the adhesive of the optical surface protective film The layer and the release layer of the separation piece are laminated together. A well-known method can be used for the bonding operation, for example, a method of bonding an optical surface protection film and a separator using a laminator (manufactured by MCK Co., Ltd., MRK-600).

<Optical member> In the present invention, the surface protective film for optics after peeling the separator from the adhesive layer surface of the separator-attached optical surface protective film can be attached to the optical member to protect the optical member. The above-mentioned separator has excellent cushioning properties, so it is not easy to generate dents, and the above-mentioned optical surface protection film is excellent in appearance grade (appearance), so it can be used for surface protection purposes (surface protection film) during processing, transportation, and shipping. ) for protecting the surface of the aforementioned optical member (polarizing plate, etc.). Example

Several embodiments related to the present invention are described below, but the present invention is not intended to be limited to those shown in the related specific examples. In addition, "part" and "%" in the following description are based on weight unless otherwise indicated. And the blending amount (addition amount) has been shown in the table.

In addition, each characteristic in the following description was measured or evaluated as follows, respectively.

<Measurement of haze> The measurement of haze can follow the method stipulated in JIS K7136 "Plastic-Transparent Material Haze Determination", using a haze meter (Murakami Color Institute, HM-150 type ) to proceed.

<Determination of total light transmittance> The total light transmittance can be measured in accordance with the method specified in JIS K7361 "Plastic-Transparent Materials Test Method for Total Light Transmittance", using a haze meter (made by Murakami Color Institute, HM -150 type) to carry out.

<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 value , and obtained by the following formula. Formula: 1/(Tg+273)=Σ[Wn/(Tgn+273)] (in the formula, 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 kind of each monomer). Literature values: 2-ethylhexyl acrylate (2EHA): -70°C Butyl acrylate (BA): -55°C 2-hydroxyethyl acrylate (HEA): -15°C acrylic acid (AA): 106°C The value is based on "Synthesis, Design and New Application Development of Acrylic Resin" (published by the Central Business Development Center Publishing Department).

<Measurement of the weight average molecular weight (Mw) of the (meth)acrylic polymer> The weight average molecular weight (Mw) of the (meth)acrylic polymer used was measured using a GPC apparatus (HLC- 8220GPC). The measurement conditions are as follows: Sample concentration: 0.2 wt% (THF solution) Sample injection volume: 10 μl Elution solution: THF Flow rate: 0.6 ml/min Measurement temperature: 40°C Column: Sample column: TSKguardcolumn SuperHZ-H (1 piece)+ TSKgel SuperHZM-H (two pieces) Reference column: TSKgel SuperH-RC (one piece) Detector: Differential refractometer (RI) In addition, the weight average molecular weight was calculated|required by polystyrene conversion value. In addition, when measuring the number average molecular weight (Mn), it measured in the same manner as the weight average molecular weight (Mw).

<Automatic bonding is possible> Only the surface protection film was cut into 100 mm×110 mm so as not to cut the separation piece of the surface protection film for optics with the separation piece. Then, a hole with a diameter of 5 mm is arranged in the separating piece so as to be in contact with each of the four corners of the cut surface protection film. According to the above method, on one of the suction plates (hereinafter referred to as suction plate 1) of a precision single-chip laminating machine (manufactured by Climb Products Co., Ltd., SE650naa), with the separator side facing upwards, a hole-opened attachment was placed. For the optical surface protection film of the separation piece, a glass of 100 mm×110 mm is placed on another adsorption plate (referred to as adsorption plate 2 below). Rotate the adsorption plate 1 and stack it on the adsorption plate 2, and then adjust the position of the adsorption plate 2 with a CCD camera with a precision single-chip laminating machine, so that the holes of the optical surface protection film with the separate parts do not overlap with the glass . After adjusting the position (refer to Fig. 2), the suction plate 1 is temporarily separated from the suction plate 2, and the separation part is peeled off, and then the suction plate 1 is moved to the suction plate 2, and the roller pressure is 8kgf/cm ² and the roller speed is 5mm/ Attach the optical surface protection film to the glass surface in seconds. Whether or not automatic bonding was possible (evaluation) was evaluated as ○ when the optical surface protection film could be automatically adjusted and attached correctly, and the case where the optical surface protection film could not be automatically adjusted correctly was evaluated as ×.

<Preparation of (meth)acrylic polymer (A)> 100 parts by weight of 2-ethylhexyl acrylate (2EHA) and 4 parts by weight of 2-hydroxyethyl acrylate (HEA) were used as 2 of the polymerization initiators , 0.2 parts by weight of 2'-azobisisobutyronitrile (AIBN) and 205 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, and nitrogen was introduced while stirring slowly , the liquid temperature in the flask was maintained at around 63° C., the polymerization reaction was performed for about 4 hours, and a (meth)acrylic polymer (A) solution (about 35% by weight) was prepared. The weight average molecular weight (Mw) of the said (meth)acrylic-type polymer (A) was 650,000, and the glass transition temperature (Tg) was -68 degreeC.

<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-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler, and nitrogen gas was introduced while stirring slowly, and the liquid temperature in the flask was maintained at around 65°C The 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 said (meth)acrylic-type polymer (B) was 1,100,000, and the glass transition temperature (Tg) was -47 degreeC.

[Preparation of Acrylic Adhesive (1) Solution] The above-mentioned (meth)acrylic polymer (A) solution (35% by weight) was diluted with ethyl acetate to 29% by weight, and 500 parts by weight of this solution (solid 100 parts by weight of components), 4 weights of tri-functional isocyanate compounds of hexamethylene diisocyanate and trimer isocyanate (Coronate HX: C/HX, manufactured by Nippon Polyurethane Co., Ltd.) were added as a crosslinking agent. 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 cross-linking catalyst, The acrylic adhesive (1) solution was prepared by mixing and stirring for about 1 minute while maintaining the temperature around 25°C.

[Preparation of Acrylic Adhesive (2) 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 this solution (solid 100 parts by weight of components), an isocyanate-based cross-linking agent (a isocyanate body of hexamethylene diisocyanate (trade name "Coronate HX": C/HX, Japan Polyurethane) was added as a cross-linking agent. Company) 5 parts by weight (solid content 5 parts by weight), dibutyltin dilaurate (1% by weight ethyl acetate solution) as a crosslinking catalyst 3 parts by weight (solid content 0.03 parts by weight), no additives 0.3 parts by weight (0.3 parts by weight of solid content) of the organopolysiloxane-containing polyoxyalkylene chain compound (Aqualon HS-10, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) was mixed and stirred to prepare an acrylic adhesive (2) Solution.

[Preparation of Acrylic Adhesive (3) Solution] The above-mentioned (meth)acrylic polymer (B) solution (30% by weight) was diluted with ethyl acetate to 29% by weight, and 500 parts by weight of this solution (solid component 100 parts by weight), 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 (solid content 6 parts by weight), mixed and stirred to prepare a solution of acrylic adhesive (3) .

[Preparation of Urethane-Based Adhesive (4) Solution] As a polyol, 85 parts by weight of a polyol having three hydroxyl groups, Preminol S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), and a polyol having three hydroxyl groups were blended 13 parts by weight of Sannix GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), 2 parts by weight of a polyol having three hydroxyl groups Sannix GP1000 (manufactured by Sanyo Chemical Co., Ltd., Mn=1000), the second trifunctional isocyanate compound as a crosslinking agent Trimeric isocyanate of hexamethylene isocyanate (Coronate HX: C/HX, manufactured by Japan Polyurethane Co., Ltd.) 18 parts by weight, iron (III) acetoacetate as a cross-linking catalyst (see (B) Acetate) iron, "Fe" in Table 3, manufactured by Tokyo Chemical Industry Co., Ltd.) 0.04 parts by weight, 30 parts by weight of isopropyl myristate (Exceparl IPM, manufactured by Kao Corporation) as a wettability enhancer, as an antioxidant 0.5 parts by weight of Irganox 1010 (manufactured by BASF) and 210 parts by weight of ethyl acetate as a diluting solvent were used to prepare a solution of the urethane-based adhesive (4).

[Preparation of Polysiloxane-Based Adhesive (5) Solution] 100 parts by weight of "X-40-3229" (solid content: 60% by weight, manufactured by Shin-Etsu Chemical Co., Ltd.) was blended as a polysiloxane-based adhesive 0.5 parts by weight of "CAT-PL-50T" (manufactured by Shin-Etsu Chemical Co., Ltd.) as a platinum catalyst, and 100 parts by weight of toluene as a solvent, to prepare a polysiloxane-based adhesive (5) solution.

[Separator I, II, and VII] As shown in Table 5, the separator is a commercially available base material with a mold release layer provided on the base material (PET film).

[Preparation of Separation Part III] 100 parts by weight of polysiloxane mold release agent (manufactured by Shin-Etsu Chemical Industry Co., Ltd., KS-847H), and 3.3 parts by weight of polysiloxane hardening catalyst (manufactured by Shin-Etsu Chemical Co., Ltd., CAT-PL-50T) , and diluted with toluene (Idemitsu Petrochemical Co., Ltd.), hexane (Maruzen Petrochemical Co., Ltd., n-hexane), and methyl ethyl ketone (Idemitsu Kosan Co., Ltd., MEK) in a weight ratio of 1:2:1. 0.3% by weight to obtain a release agent composition. This release agent composition was apply|coated to the base material of thickness 50 micrometers, ie, PET film (made by Mitsubishi Plastics, DIAFOIL W100), and it dried at 130 degreeC for 1 minute, and produced the separator III. The thickness of the mold release layer after drying was 20 nm.

[Preparation of Separators IV to VI and VIII] As shown in Table 5, except that the PET film of the trade name described in Table 5 was used instead of the PET film used for Separator III, it was produced in the same way as that of Separator III.

<Example 1> [Preparation of an antistatic treatment film] 10 parts by weight of an antistatic agent (Micro-Solver RMd-142, manufactured by Solvex Co., Ltd., mainly composed of tin oxide and polyester resin) was added to 30 parts by weight of water. It was diluted with a mixed solvent composed of 70 parts by weight of methanol to prepare an antistatic agent solution. The obtained antistatic agent solution was coated on a polyethylene terephthalate (PET) film (thickness: 38 μm) of the base film using a meyer bar, and dried at 130° C. for 1 minute. By removing the solvent, an antistatic layer (thickness: 0.2 μm) was formed to prepare an antistatic treatment film.

[Production of surface protective film for optics with separator] The above-mentioned acrylic adhesive (1) solution was applied on the surface opposite to the antistatically treated surface of the above-mentioned antistatic treated film, and heated at 130°C for 2 minutes to prepare An adhesive layer with a thickness of 15 μm was formed. Next, a polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., trade name: Crisper K7211-38 μm, haze: 99.3%, total light transmittance: 13.6%) was prepared as a separation member treated with polysiloxane on one side. , the polysiloxane treatment surface with a thickness of 50 μm) is attached to the surface of the above-mentioned adhesive layer, and an optical surface protection film with a separate part is produced.

<Examples 2 and 3> As shown in Table 2, in place of the acrylic adhesive (1) solution used in Example 1, an acrylic adhesive (2) solution or an acrylic adhesive (3) solution was used Except for this, a surface protective film for optics with a separator was produced in the same manner as in Example 1.

<Examples 4 and 5> As shown in Tables 3 and 4, in place of the acrylic adhesive (1) solution used in Example 1, a urethane adhesive (4) solution or a polysilicon Except for the oxygen-based adhesive (5) solution, the same method as in Example 1 was used to prepare a surface protective film for optics with a separator attached to which heating conditions and the like or the thickness of the obtained adhesive layer was adjusted.

<Examples 6 to 10, Comparative Examples 1 and 2> As shown in Table 6, except that the separator I used in Example 1 was replaced by separators II to VIII, the attached separators were prepared in the same manner as in Example 1. The optical surface protection film.

Tables 1 to 6 show the above-mentioned blending contents, the results of various measurements and evaluations performed on the surface protective films for optics with a separator of Examples and Comparative Examples. In addition, the compounding quantity in a table|surface shows an active ingredient.

[Table 1]

[Table 2]

[table 3]

[Table 4]

[table 5]

[Table 6]

From the above-mentioned Table 6, it can be confirmed that all the examples are automatically bonded at the correct position. It can be confirmed that in Comparative Example 1 and Comparative Example 2, the haze and total light transmittance of the separator were outside the expected range, so the optical surface protection film with the separator could not be automatically adjusted to the surface of the optical member. , and the surface protection film for optics cannot be attached to the surface of the optical member at the correct position after peeling off the separator.

Industrial Applicability The optical surface protective film with a separator disclosed herein is suitable for manufacturing and transporting as a constituent element of liquid crystal display panels, plasma display panels (PDP), organic electroluminescence (EL) displays, etc. When using an optical member, etc., it is used as a surface protection film to protect the optical member. It is especially used as an optical surface protection film suitable for optical components such as polarizers (polarizing films), wavelength plates, retardation plates, optical compensation films, brightness enhancement films, light diffusion sheets, and reflective sheets for liquid crystal display panels.

1‧‧‧Separator 2‧‧‧Optical Surface Protective Film 3‧‧‧Optical Surface Protective Film with Separator 10‧‧‧Optical Member 11‧‧‧Substrate 12‧‧‧Release Layer 21‧‧ ‧Adhesive layer 22‧‧‧Substrate film

FIG. 1 is a schematic cross-sectional view showing a configuration example of the optical surface protection film with a separator of the present invention.

2 is a schematic cross-sectional view showing an example of the configuration of the optical surface protection film with a separator of the present invention after position adjustment is performed on the optical member.

Claims (3)

A surface protective film for optics with a separator, comprising: a base film, an adhesive layer disposed on at least one side of the base film, and the opposite side of the adhesive layer that is in contact with the base film The separation part above; the separation part has a release layer and a base material, and the optical surface protection film with the separation part is characterized in that: the base material is a polyester film, and the haze of the separation part is above 90%, And the total light transmittance is below 50%. The surface protective film for optics with a separator according to claim 1, wherein the aforementioned substrate film is a polyester film. The surface protective film for optics with a separator according to any one of claims 1 or 2, wherein the adhesive layer is made of a material selected from the group consisting of acrylic adhesives, urethane adhesives and polysiloxane adhesives. An adhesive composition of at least one adhesive is formed.

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