JP6546806B2 - Optical surface protection film with separator - Google Patents

Description

  The present invention relates to an optical surface protection film with a separator.

  The surface protective film for optics with a separator of the present invention is an optical member such as glass, polarizing plate, wave plate, retardation plate, optical compensation film, reflective sheet, brightness improving film, and transparent conductive film used for liquid crystal display etc. It is useful as an optical surface protection film used for the purpose of protecting the surface.

  Generally, in the case of processing, assembly, inspection, transportation, etc., an optical surface protection film is attached to an optical member, an electronic member, etc., in order to prevent the damage of the exposed surface thereof. The optical surface protection film is composed of a base film and an adhesive layer, and, if necessary, a separator (a release film or a release film on the surface of the adhesive layer for the purpose of protecting the adhesive layer prior to application (use). A release liner is also bonded to each other to produce an optical surface protection film with a separator (Patent Document 1). The surface protective film for optics with a separator is stuck on the optical member which is a to-be-adhered body, after peeling a separator.

  The optical surface protection film attached is peeled off from the optical member when it becomes unnecessary, and a layer (another layer) having another function is provided on the surface of the optical member after peeling. There are cases (Patent Document 2).

JP 2012-224811 A JP 2014-208756

  However, depending on the state of the surface of the optical member (adherend) after peeling off the optical surface protection film, the other layers may be optical members due to deterioration in wettability and adhesion to other layers, etc. There is a problem that peeling occurs from the product and the product becomes defective. In particular, in the case of an optical surface protection film with a separator, when the release layer of the separator contains a silicone-based material (for example, a siloxane component), the silicone-based material of the release layer is transferred to the pressure-sensitive adhesive layer of the surface protection film. Since the surface of the optical member (adherend) after peeling off the optical surface protective film is contaminated with the silicone-based material, the above problem becomes remarkable.

  On the other hand, the total thickness of the optical surface protection film with a separator tends to be thin due to the demand for cost reduction and thinning. However, when the total thickness is small, the separator-equipped optical surface protection film is easily deformed by an external force, and as a result, the handling property of the separator-equipped optical surface protection film is reduced (for example, the separator-equipped optical surface protection film Once wound in a cylindrical shape, there is a problem that the film is deformed into a curl and can not be returned to the original state.

  The present invention relates to an optical surface protection film with a separator, in which the total thickness of the optical surface protection film with a separator is reduced without contaminating the surface of the optical member (adherend) with a silicone material. Also, it is an object of the present invention to provide an optical surface protection film with a separator, in which the optical surface protection film with a separator is hardly deformed by an external force.

  In view of the above circumstances, the inventors of the present invention conducted intensive studies, and as a result, in the surface protective film for optics with a separator, the shear adhesion (shear force) of the adhesive layer of the optical surface protective film to the release layer of the separator By increasing the value of) above a certain value, it is difficult to cause a shift at the interface between the pressure-sensitive adhesive layer and the release layer, so an external force was applied to the optical surface protective film with a separator (for example, the film was bent) Also in the case, as a result that the stress is not relieved, it has been found that even when the total thickness of the separator-equipped optical surface protective film becomes thin, it is possible to prevent a decrease in handling due to the deformation of the separator-equipped optical surface protective film. And, by making the peeling force of the separator for the optical surface protection film below a certain level, the optical surface protection film is obtained. It found that arm and the separators is excellent in peeling property, and have completed the present invention.

  That is, the present invention is an optical surface protection film with a separator, having an optical surface protection film having a pressure sensitive adhesive layer on at least one side of a polyester film, and a separator on the opposite side of the pressure sensitive adhesive layer to the polyester film. The separator has a substrate and a non-silicone release layer, and the shear adhesion of the optical surface protective film to the separator is at least 15 N / 10 mm at a tensile speed of 0.06 m / min. And the peeling force of the separator to the optical surface protection film is 0.3 N / 50 mm or less at a peeling angle of 180 degrees and a peeling speed of 0.3 m / min. Regarding film.

  In the separator-attached optical surface protection film of the present invention, the non-silicone release layer is preferably formed from a long-chain alkyl material and / or a release agent composition containing an aliphatic carboxylic acid ester. .

  In the separator-equipped optical surface protection film of the present invention, the pressure-sensitive adhesive layer is formed of an acrylic pressure-sensitive adhesive composition containing a (meth) acrylic polymer (A) and a crosslinking agent (B), and the (meth) acrylic The polymer (A) includes, as monomer components, an alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms and a functional group-containing (meth) acrylic monomer, and the alkyl group containing 2 to 14 carbon atoms described above The functional group-containing (meth) acrylic monomer is preferably contained in an amount of 2 to 20 parts by weight with respect to 100 parts by weight of the (meth) acrylic monomer.

  In the separator-equipped optical surface protection film of the present invention, the crosslinking agent (B) is preferably a polyfunctional isocyanate compound and / or a polyfunctional epoxy compound.

  The surface protective film for optics with a separator of the present invention contains 2 to 25% by weight of the polyfunctional isocyanate compound and / or the polyfunctional epoxy compound with respect to 100 parts by weight of the (meth) acrylic polymer (A). It is preferable to contain part.

  In the separator-equipped optical surface protection film of the present invention, the pressure-sensitive adhesive layer is preferably formed of a urethane-based pressure-sensitive adhesive composition.

  In the separator-equipped optical surface protection film of the present invention, the urethane-based pressure-sensitive adhesive composition contains a polyol, a polyfunctional isocyanate-based compound, a catalyst, and an anti-deterioration agent, and the catalyst is an iron-based compound and / or tin. It is a system compound and it is preferable that the equivalent ratio (NCO / OH) of the isocyanate group of the said polyfunctional isocyanate type compound and the hydroxyl group of the said polyol is 1-5.

  The optical surface protection film with a separator of the present invention contaminates the surface of the adherend with a silicone material by the pressure-sensitive adhesive layer after sticking the pressure-sensitive adhesive layer of the optical surface protection film to an optical member (adherend) Since the surface protection film for optics with a separator is difficult to be deformed by external force, the handling property of the surface protection film for optics with a separator is not reduced, and additionally, the releasability of the separator for the surface protection film for optics is excellent Because, it is useful.

It is a typical sectional view showing an example of 1 composition of a surface protection film for optics with a separator concerning the present invention. It is a schematic diagram which shows the measuring method of the shear adhesive force which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

<Whole structure of optical surface protection film with separator>
The typical structural example of the surface protection film for optics with a separator of this invention is typically shown in FIG. The separator-equipped optical surface protection film 3 has a form in which the separator 1 and the optical surface protection film 2 are laminated. The separator 1 comprises a base material 11 and a release layer 12, the optical surface protection film 2 comprises a polyester film 22 and an adhesive layer 21 provided on one side thereof, and lamination is adhesion with the release layer 12 The agent layer 21 is pasted together. The optical surface protection film 3 with a separator is an optical member (a protection target, for example, a glass used for a liquid crystal display, etc., a polarizing plate, a wavelength plate, a retardation plate) which is an adherend after the separator 1 is peeled off. It is used by sticking on the surface of optical components such as a plate, an optical compensation film, a reflective sheet, a brightness enhancement film, and a transparent conductive film), and is peeled from the optical member when it becomes unnecessary. Further, the separator-equipped optical surface protection film 3 has the pressure-sensitive adhesive layer 2 on both sides of the polyester film 22, and has the antistatic layer on the opposite side of the surface of the polyester film 22 to which the pressure-sensitive adhesive layer 2 is attached. Can be mentioned.

<Optical surface protection film>
The optical surface protection film of the present invention comprises a polyester film and a pressure-sensitive adhesive layer.

  The optical surface protection film of the present invention is an optical component (for example, glass used for liquid crystal display etc., polarizing plate, wave plate, retardation plate, optical compensation film, reflection sheet, brightness improving film, transparent conductive film, etc.) Surface protective film for protecting the surface of the optical component during processing and transport of the optical component), and is generally referred to as an adhesive sheet for optics, an adhesive tape for optics, an adhesive label for optics, an adhesive film for optics, etc. Form. The pressure-sensitive adhesive layer in the optical surface protective film is typically formed continuously, but is not limited to such a form, and is formed, for example, in a regular or random pattern such as a dot shape or a stripe shape. It may be a pressure-sensitive adhesive layer. The optical surface protection film may be in the form of a roll or sheet.

<Polyester film>
The polyester film of the present invention is mainly composed of a polymer material (polyester resin) having a main skeleton based on an ester bond, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate etc. It can be mentioned. The polyester film is excellent in optical characteristics and dimensional stability.

  If necessary, various additives such as an antioxidant, an ultraviolet light absorber, a plasticizer, a coloring agent (pigment, dye, etc.) may be blended in the resin material constituting the polyester film. The first surface of the polyester film may be subjected to known or commonly used surface treatment such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, application of an undercoat, and the like. Such surface treatment may be, for example, treatment for enhancing the adhesion between the polyester film and the pressure-sensitive adhesive layer (the anchoring property of the pressure-sensitive adhesive layer). A surface treatment in which a polar group such as a hydroxyl group is introduced to the surface of the polyester film can be preferably employed. In addition, the second surface of the polyester film may be subjected to the same surface treatment as the first surface to provide a pressure-sensitive adhesive layer or an antistatic layer.

  The optical surface protection film of the present invention can be provided with an antistatic function by providing the antistatic layer on the surface of the polyester film opposite to the surface to which the pressure-sensitive adhesive layer is attached. In addition, a polyester film which has been subjected to antistatic treatment in advance may be used. By using the polyester film, when the separator is peeled, or when the pressure-sensitive adhesive layer is peeled from the optical member as the adherend, charging is suppressed, which is preferable. In addition, there is no restriction | limiting in particular as a method of providing an antistatic function, A conventionally well-known method can be used, For example, antistatic resin, an electroconductive polymer, an electroconductive substance which consists of an antistatic agent and a resin component The method of applying the conductive resin to be contained, the method of depositing or plating the conductive substance, the method of kneading the antistatic agent and the like, and the like can be mentioned.

  The thickness of the polyester film is usually 5 to 200 μm, preferably 10 to 100 μm, and more preferably 15 to 50 μm. It is preferable for the thickness of the polyester film to be in the above-mentioned range, since the bonding workability to an optical member as an adherend and the peeling workability from an optical member are excellent.

<Pressure-sensitive adhesive layer>
The pressure-sensitive adhesive layer of the present invention can be used without particular limitation as long as it has adhesiveness, but it is a pressure-sensitive adhesive layer formed from a pressure-sensitive adhesive composition not containing a silicone material (for example, a siloxane component). Is preferred. Examples of the pressure-sensitive adhesive composition include an acrylic pressure-sensitive adhesive composition, a urethane-based pressure-sensitive adhesive composition, a synthetic rubber-based pressure-sensitive adhesive composition, a natural rubber-based pressure-sensitive adhesive composition, and the like. An acrylic pressure-sensitive adhesive composition and a urethane-based pressure-sensitive adhesive composition can be preferably used from the viewpoint of removability (peeling the surface protection film for optics from an adherend).

<Acrylic pressure-sensitive adhesive composition>
The acrylic pressure-sensitive adhesive composition contains a (meth) acrylic polymer (A) and a crosslinking agent (B). The (meth) acrylic polymer refers to an acrylic polymer and / or a methacrylic polymer.

<(Meth) acrylic polymer (A)>
The (meth) acrylic polymer (A) is not particularly limited as long as it is a tacky (meth) acrylic polymer, and as a monomer component, an alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms It is preferable to use 1 type, or 2 or more types can be used for a C2-C14 alkyl group containing (meth) acrylic-type monomer, and it can be used as a main component in a monomer component. The main component means that the blending ratio is the highest.

<C2-C14 Alkyl Group-Containing (Meth) Acrylic-Based Monomer>
As a specific example of the said C2-C14 alkyl group containing (meth) acrylic-type monomer, ethyl (meth) acrylate, n-butyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl ( Meta) acrylate, isobutyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate 2.) Acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, n-tetradecyl (meth) acrylate and the like.

  Among them, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) ) An alkyl group-containing (meth) acrylic monomer having 6 to 14 carbon atoms such as acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, n-tetradecyl (meth) acrylate It is mentioned as a suitable thing. By using a (meth) acrylic monomer having an alkyl group having 6 to 14 carbon atoms, it is easy to control the adhesion to the adherend to a low level, and a pressure-sensitive adhesive layer having excellent removability can be obtained.

  The (meth) acrylic polymer (A) is an alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms with respect to the total amount of monomer components constituting the (meth) acrylic polymer (A). The content is preferably 50 to 99% by weight, more preferably 60 to 98% by weight, still more preferably 70 to 97% by weight, and most preferably 80 to 96% by weight. By being within this range, the pressure-sensitive adhesive composition has appropriate wettability, and is also excellent in the cohesion of the pressure-sensitive adhesive layer, which is preferable.

<Functional group-containing (meth) acrylic monomer>
The (meth) acrylic polymer (A) preferably further contains a functional group-containing (meth) acrylic monomer as a monomer component. The functional group-containing (meth) acrylic monomer is preferably a (meth) acrylic monomer of a hydroxyl group-containing (meth) acrylic monomer and / or a carboxyl group-containing (meth) acrylic monomer.

<Hydroxyl group-containing (meth) acrylic monomer>
By using the above-mentioned hydroxyl group-containing (meth) acrylic monomer, the hydroxyl group can easily control the cross-linking, and the balance between the improvement of the wettability by the flow and the cohesion of the pressure-sensitive adhesive layer and the shear adhesion. It becomes easy to control. Furthermore, when an antistatic agent is added to the pressure-sensitive adhesive layer, unlike a carboxyl group or a sulfonate group which generally acts as a crosslinking site, a hydroxyl group interacts appropriately with an ionic compound which is an antistatic agent. Since it has, it can be suitably used also in terms of antistaticity.

  Examples of the hydroxyl group-containing (meth) acrylic monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate. 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxy lauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) methyl acrylate, N-methylol (meth) acrylamide and the like. The hydroxyl group-containing (meth) acrylic monomers may be used alone or in combination of two or more.

<Carboxyl group-containing (meth) acrylic monomer>
By using the carboxyl group-containing (meth) acrylic monomer, the carboxyl group can improve the shear adhesive strength, and further, the increase of the adhesive strength with time can be prevented, and the removability, the adhesive strength rise preventing property, and the workability Become an excellent adhesive layer. In particular, by improving the shear adhesive strength of the pressure-sensitive adhesive layer, by sticking the pressure-sensitive adhesive layer to the adherend, curling based on the adherend can be suppressed, and between the pressure-sensitive adhesive layer and the adherend ( Generation of slippage and slippage at the interface) can be suppressed.

  Examples of the carboxyl group-containing (meth) acrylic monomers include (meth) acrylic acid, carboxyl ethyl (meth) acrylate, carboxyl pentyl (meth) acrylate, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, -(Meth) acryloyloxypropylhexahydrophthalic acid, 2- (Meth) acryloyloxyethyl phthalic acid, 2- (Meth) acryloyloxyethylsuccinic acid, 2- (Meth) acryloyloxyethylmaleic acid, carboxy Polycaprolactone mono (meth) acrylate, 2- (meth) acryloyloxyethyl tetrahydrophthalic acid and the like can be mentioned. The carboxyl group-containing (meth) acrylic monomers may be used alone or in combination of two or more.

  The functional group-containing (meth) acrylic monomer is preferably 2 to 20 parts by weight, and more preferably 2 parts by weight with respect to 100 parts by weight of the alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms. It is 15 parts by weight, more preferably 4 to 12 parts by weight. Within this range, it is easy to control the balance between the wettability of the pressure-sensitive adhesive composition and the cohesion of the pressure-sensitive adhesive layer and the shear adhesion, and it is preferable because it is excellent in removability and adhesion increase prevention.

<Other polymerizable monomers>
As the monomer component of the (meth) acrylic polymer (A), other polymerizable monomers can be used without particular limitation as long as the characteristics of the present invention are not impaired. The other polymerizable monomers, in particular, have a glass transition temperature or the like so that the Tg of the (meth) acrylic polymer (A) is −50 ° C. or less and −100 ° C. or more because the adhesion performance can be easily balanced. It can be used to adjust the releasability.

  Examples of the other polymerizable monomers include cohesion and heat resistance improving components such as cyano group-containing monomers, vinyl ester monomers and aromatic vinyl monomers, amide group-containing monomers, imide group-containing monomers, amino group-containing monomers, A component having a functional group acting as a crosslinking (adhesion) strength improvement or a crosslinking base point, such as an epoxy group-containing monomer, N-acryloyl morpholine, a vinyl ether monomer, can be suitably used. These polymerizable monomers may be used alone or in combination of two or more.

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

  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 amide group-containing monomer include acrylamide, methacrylamide, diethyl acrylamide, N-vinyl pyrrolidone, N, N-dimethyl acrylamide, N, N- dimethyl methacrylamide, N, N- diethyl acrylamide, N, N- diethyl Methacrylamide, N, N'-methylenebisacrylamide, N, N-dimethylaminopropyl acrylamide, N, N-dimethylaminopropyl methacrylamide, diacetone acrylamide etc. are mentioned.

  Examples of the imide group-containing monomer include cyclohexyl maleimide, isopropyl maleimide, N-cyclohexyl maleimide, itaconimide and the like.

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

  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, isobutyl vinyl ether and the like.

  It is preferable that it is 0.01 to 10 weight% with respect to the monomer component whole quantity which comprises the said (meth) acrylic-type polymer (A), and said other polymerizable monomer is 0.05 to 5 weight%. Is more preferred. By using the above-mentioned other polymerizable monomers within this range, for example, when using an ionic compound of the antistatic agent, properly adjusting the good interaction with the compound and the good removability. Can.

  The weight average molecular weight (Mw) of the (meth) acrylic polymer (A) is preferably 100,000 to 5,000,000, more preferably 200,000 to 4,000,000, and still more preferably 300,000 to 3,000,000. When the weight average molecular weight is less than 100,000, the adhesive force of the pressure-sensitive adhesive composition tends to be reduced to cause adhesive residue. On the other hand, when the weight average molecular weight (Mw) exceeds 5,000,000, the fluidity of the polymer decreases and the wetting to the adherend (for example, a polarizing plate as an optical member) becomes insufficient, and the adherend adheres There is a tendency to cause swelling that occurs between the agent layer. In addition, a weight average molecular weight (Mw) says what was obtained by measuring by GPC (gel permeation chromatography).

  The glass transition temperature (Tg) of the (meth) acrylic polymer (A) is preferably −50 ° C. or less, more preferably −55 ° C. or less, and still more preferably −60 ° C. or less. As for the glass transition temperature (Tg) of the said (meth) acrylic-type polymer, -100 degreeC or more is preferable. When the glass transition temperature is higher than −50 ° C., the polymer does not flow easily, and, for example, the wetting to the adherend (eg, a polarizing plate as an optical member) becomes insufficient, and the adherend and the pressure-sensitive adhesive layer There is a tendency to cause the swelling that occurs between. In particular, by setting the glass transition temperature to −61 ° C. or less, an adhesive composition having excellent wettability to the adherend and light releasability can be easily obtained. In addition, the glass transition temperature of the said (meth) acrylic-type polymer (A) can be adjusted in the said range by changing the monomer component and composition ratio to be used suitably.

  The polymerization method of the (meth) acrylic polymer (A) is not particularly limited, and the polymerization can be carried out by known methods such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization and the like, but in particular from the viewpoint of workability Solution polymerization is a more preferable embodiment from the viewpoint of low contamination property to the adherend, and the like. Further, the polymer to be obtained may be any of a random copolymer, a block copolymer, an alternating copolymer, a graft copolymer and the like.

<Crosslinking agent (B)>
The acrylic pressure-sensitive adhesive composition preferably contains a crosslinking agent (B). As the crosslinking agent (B), an isocyanate compound, an epoxy compound, a melamine resin, an aziridine derivative, a metal chelate compound or the like may be used, and in particular, the use of an isocyanate compound and / or an epoxy compound is preferable. It becomes an aspect. These compounds may be used alone or in combination of two or more.

<Polyfunctional isocyanate compound>
As said isocyanate type compound, the polyfunctional isocyanate type compound which has an isocyanate group at least 2 in 1 molecule can be used. For example, known aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates and the like are used.

  Examples of the aliphatic polyisocyanate include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, and 2,4,4- Trimethyl hexamethylene diisocyanate etc. are mentioned.

  Examples of the alicyclic polyisocyanate include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene An isocyanate hydrogenated tetramethyl xylylene diisocyanate etc. are mentioned.

  Examples of the aromatic polyisocyanate include phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,2′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, and the like. 4,4'-toluidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, xylylene diisocyanate and the like.

  In addition, as the polyfunctional isocyanate compound, a multimer (dimer, trimer, pentamer, etc.) of the above diisocyanate, a urethane modified product reacted with a polyhydric alcohol such as trimethylolpropane, a urea modification Body, biuret-modified, alphanate-modified, isocyanurate-modified, carbodiimide-modified and the like.

  Examples of commercial products of the polyfunctional isocyanate compound include, for example, trade names "Millionate MT", "Millionate MTL", "Millionate MR-200", "Millionate MR-400", "Corronate L", "Corronate HL", "Corronate HX" [or more] Manufactured by Nippon Polyurethane Industry Co., Ltd.]; trade names "Takenate D-110N" "Takenate D-120N" "Takenate D-140N" "Takenate D-160N" "Takenate D-165N" "Takenate D-170HN" "Takenate D-" 178N, "Takenate 500", "Takenate 600" [above, Mitsui Chemicals, Inc.]; and the like. These compounds may be used alone or in combination of two or more.

  As said polyfunctional isocyanate type compound, aliphatic polyisocyanate and its modified body are preferable. Compared with other isocyanate crosslinking agents, aliphatic polyisocyanates and their modified products are more flexible in cross-linked structure, and are easier to relieve the stress associated with expansion / contraction of the optical film, and peeling occurs in the durability test It is difficult to do. Particularly as aliphatic polyisocyanate and its modification, hexamethylene diisocyanate and its modification are preferable.

<Multifunctional epoxy compound>
As the epoxy compound, a polyfunctional epoxy compound having at least two epoxy groups in one molecule can be used. Examples of polyfunctional epoxy compounds include N, N, N ′, N′-tetraglycidyl-m-xylenediamine, diglycidyl aniline, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, 1 , 6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, Pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycol Other than di-zyl ether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, triglycidyl-tris (2-hydroxyethyl) isocyanurate, resorcinol diglycidyl ether, bisphenol-S-diglycidyl ether, and an epoxy group in the molecule The epoxy resin etc. which have 2 or more are mentioned. Further, commercial products such as trade name "Tetraded C" (manufactured by Mitsubishi Gas Chemical Co., Ltd.) may be mentioned.

  The content of the polyfunctional isocyanate compound and / or the epoxy compound is 100 parts by weight of the (meth) acrylic polymer (A) from the viewpoints of removability and low staining to the adherend, The amount is preferably 2 to 25 parts by weight, and more preferably 5 to 15 parts by weight.

<Catalyst (C)>
The acrylic pressure-sensitive adhesive composition may further contain a catalyst (C) in order to allow the above reaction to proceed more effectively. As the catalyst (C), for example, tin-based catalysts such as dibutyltin dilaurate and dioctyltin dilaurate, tris (acetylacetonato) iron, tris (hexane-2,4-dionato) iron, tris (heptane-2 and 4) -Dionato) iron, tris (heptane-3,5-dionato) iron, tris (5-methylhexane-2,4-dionato) iron, tris (octane-2,4-dionato) iron, tris (6-methylheptane) -2,4-dionato) iron, tris (2,6-dimethylheptane-3,5-dionato) iron, tris (nonane-2,4-dionato) iron, tris (nonane-4,6-dionato) iron, Tris (2,2,6,6-tetramethylheptane-3,5-dionato) iron, tris (tridecane-6,8-dionato) iron, tris (1-phenylbutane-1,3-) Onato) iron, tris (hexafluoroacetylacetonato) iron, tris (ethyl acetoacetate) iron, tris (acetoacetic acid-n-propyl) iron, tris (isopropyl acetoacetate) iron, tris (acetoacetic acid-n-butyl) Iron, Tris (acetoacetate-sec-butyl) iron, Tris (acetoacetate-tert-butyl) iron, Tris (propionyl acetate methyl) iron, Tris (propionyl acetate ethyl) iron, Tris (propionyl acetate-n-propyl) iron Tris (propionyl acetate isopropyl) iron, tris (propionyl acetate-n-butyl) iron, tris (propionyl acetate-sec-butyl) iron, tris (propionyl acetate-tert-butyl) iron, tris (benzyl acetoacetate) iron, Tris (dimethyl malonate) iron, tris (diethyl malonate) iron, trimethoxy iron, Iron-based catalysts such as triethoxy iron, triisopropoxy iron, ferric chloride and the like can be used. The catalyst (C) may be used alone or in combination of two or more.

Moreover, as said iron-type catalyst, an iron chelate compound can be used suitably, For example, it can represent as general formula Fe (X) (Y) (Z). Iron chelate compounds can be obtained by combining (X) (Y) (Z) with Fe (X) ₃ , Fe (X) ₂ (Y), Fe (X) (Y) ₂ , Fe (X) (Y) (Z) It is represented by any of. In the iron chelate compound Fe (X) (Y) (Z), (X) (Y) (Z) is a ligand for Fe, and for example, when X, Y or Z is a β-diketone, β is β As diketones, acetylacetone, hexane-2,4-dione, heptane-2,4-dione, heptane-3,5-dione, 5-methyl-hexane-2,4-dione, octane-2,4-dione, 6-Methylheptane-2,4-dione, 2,6-dimethylheptane-3,5-dione, nonane-2,4-dione, nonane-4,6-dione, 2,2,6,6-tetramethyl Heptane-3,5-dione, tridecane-6,8-dione, 1-phenyl-butane-1,3-dione, hexafluoroacetylacetone, ascorbic acid and the like can be mentioned.

  When the X, Y or Z is a β-ketoester, as a β-ketoester, methyl acetoacetate, ethyl acetoacetate, n-propyl acetoacetate, isopropyl acetoacetate, n-butyl acetoacetate, sec-butyl acetoacetate Acetoacetic acid tert-butyl, propionyl acetate methyl, propionyl acetate ethyl, propionyl acetate-n-propyl, propionyl acetate isopropyl, propionyl acetate-n-butyl, propionyl acetate-sec-butyl, propionyl acetate-tert-butyl, acetoacetate Examples thereof include benzyl, dimethyl malonate, diethyl malonate and the like.

  In addition, iron-based catalysts other than the above-mentioned iron chelate compounds can also be used, and for example, compounds of iron and an alkoxy group, a halogen atom, and an acyloxy group can also be used. In the case of a compound of iron and an alkoxy group, as an alkoxy group, a methoxy group, an ethoxy group, an n-propoxy group, an isopropoxy group, an n-butoxy group, a sec-butoxy group, a tert-butoxy group, a pentyloxy group, a hexyloxy group Group, heptyloxy group, octyloxy group, 2-ethylhexyl group, phenoxy group, cyclohexyloxy group, benzyloxy group, 1-benzylnaphthyloxy group and the like.

  In the case of the compound of iron and a halogen atom, examples of the halogen atom include fluorine, chlorine, bromine and iodine.

  In the case of a compound of iron and an acyloxy group, as an acyloxy group, 2-ethylhexyl acid, octyl acid, naphthenic acid, resin acid (abietic acid, neoabietic acid, d-pimaric acid, iso-d-pimaric acid, podocarp acid) Aliphatic organic acids, benzoic acids, cinnamic acids, p, gluconic acid, fumaric acid, citric acid, aspartic acid, α-ketoglutamic acid, malic acid, succinic acid, amino acids such as glycine and histidine -Aromatic fatty acids containing as a main component oxycinnamic acid and the like.

  Among the iron-based catalysts, iron chelate compounds having a β-diketone as a ligand are preferable in terms of reactivity and curability, and in particular, it is preferable to use tris (acetylacetonato) iron.

  The content (use amount) of the catalyst (C) is, for example, preferably 0.002 to 0.5 parts by weight with respect to 100 parts by weight of the (meth) acrylic polymer (A), and 0.005 to 0. 3 parts by weight is more preferable, and 0.01 to 0.1 parts by weight is even more preferable. Within this range, the rate of the crosslinking reaction is high when the pressure-sensitive adhesive layer is formed, and the pot life of the pressure-sensitive adhesive composition is extended, which is a preferable embodiment.

<Crosslinking retarder>
Furthermore, the said acrylic adhesive composition can be made to contain the compound which produces keto-enol tautomerism as a crosslinking retarder. For example, in a pressure-sensitive adhesive composition containing a polyfunctional isocyanate-based compound or a pressure-sensitive adhesive composition that can be used in combination with a polyfunctional isocyanate-based compound, it is preferable to adopt an embodiment including the compound that produces the keto-enol tautomerism. Can. Thereby, the excessive viscosity rise and gelatinization of the adhesive composition after mix | blending of a polyfunctional isocyanate type compound can be suppressed, and the effect of extending the pot life of an adhesive composition may be implement | achieved. This technique can be preferably applied, for example, when the pressure-sensitive adhesive composition is in the form of an organic solvent solution or a solventless form.

  As a compound which produces the said keto- enol tautomerism, various (beta) -dicarbonyl compounds can be used. Specific examples thereof include acetylacetone, 2,4-hexanedione, 3,5-heptanedione, 2-methylhexane-3,5-dione, 6-methylheptane-2,4-dione, 2,6-dimethylheptane-. Β-diketones such as 3,5-dione; acetoacetic acid esters such as methyl acetoacetate, ethyl acetoacetate, isopropyl acetoacetate, tert-butyl acetoacetate; ethyl propionyl acetate, ethyl propionyl acetate, isopropyl propionyl acetate, propionyl acetate Propionyl acetates such as tert-butyl; isobutyryl acetates such as ethyl isobutyryl acetate, ethyl isobutyryl acetate, isopropyl isobutyryl acetate, tert-butyl isobutyryl acetate; malonic esters such as methyl malonate and ethyl malonate; And the like. Among them, acetylacetone and acetoacetic esters are mentioned as preferable compounds. The compounds that produce keto-enol tautomerism may be used alone or in combination of two or more.

  The content of the compound that causes the keto-enol tautomerism can be, for example, 0.1 to 20 parts by weight with respect to 100 parts by weight of the (meth) acrylic polymer (A), and is usually 0. An appropriate amount is 5 to 15 parts by weight (e.g. 1 to 10 parts by weight). When the amount of the compound is too small, it may be difficult to exhibit a sufficient use effect. On the other hand, if the compound is used more than necessary, it may remain in the pressure-sensitive adhesive layer and reduce the cohesion.

<Surfactant>
The acrylic pressure-sensitive adhesive composition can contain a surfactant from the viewpoint of improving the removability and the wettability of the pressure-sensitive adhesive composition to the adherend. As surfactant, well-known anionic surfactant, nonionic surfactant, cationic surfactant etc. are mentioned. The surfactant may be used alone or in combination of two or more.

  As the anionic surfactant, fatty acid soap, rosin acid soap, sodium naphthalene sulfonate formalin condensate, sodium alkylbenzene sulfonate, sodium alkyl sulfate such as sodium dodecyl sulfate, ammonium alkyl sulfate, alkyl sulfate triethanolamine, dialkyl sulfosuccinic acid Examples thereof include sodium, sodium alkyldiphenyl ether disulfonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, ammonium polyoxyethylene alkyl propenyl phenyl ether sulfate and the like.

  As the nonionic surfactant, polyoxyethylene alkyl ether, polyoxyethylene higher alcohol ether, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester, Examples thereof include polyoxyethylene alkylamines, alkylalkanolamides, and polyetherified compositions of acetylenic dialcohols.

  Examples of the cationic surfactant include alkyl trimethyl ammonium chloride and the like.

  The content of the surfactant can be, for example, 0.01 to 10 parts by weight with respect to 100 parts by weight of the (meth) acrylic polymer (A), and usually 0.1 to 1 parts by weight. It is appropriate to do.

  Furthermore, the acrylic pressure-sensitive adhesive composition may contain other known additives, for example, powders such as colorants and pigments, plasticizers, antistatic agents, tackifiers, 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, foils It can add suitably according to the use which uses etc.

<Urethane-based pressure-sensitive adhesive composition>
The urethane-based pressure-sensitive adhesive composition of the present invention preferably contains a polyol, a polyfunctional isocyanate-based compound, a catalyst, and an anti-deterioration agent.

  Any appropriate polyol can be adopted as the polyol, as long as it is a polyol having two or more hydroxyl groups. As such a polyol, for example, a polyol having two hydroxyl groups (diol), a polyol having three hydroxyl groups (triol), a polyol having four hydroxyl groups (tetraol), a polyol having five hydroxyl groups (Pentaol), a polyol having 6 hydroxyl groups (hexaol), and the like. As a polyol, only 1 type may be sufficient and 2 or more types may be sufficient.

  The polyol preferably contains a polyol having a number average molecular weight (Mn) of 400 to 20,000. Further, the content ratio of the polyol having a number average molecular weight (Mn) of 400 to 20,000 in the total amount of the polyol is preferably 50 to 100% by weight, more preferably 70 to 100% by weight, still more preferably 90 to It is 100% by weight, particularly preferably 95 to 100% by weight, and most preferably substantially 100% by weight. By adjusting the content ratio of the polyol having a number average molecular weight (Mn) of 400 to 20,000 in the polyol within the above range, for example, a urethane-based adhesive excellent in reworkability, initial wettability, and transparency is provided. can do.

  Examples of the polyol include polyester polyols, polyether polyols, polycaprolactone polyols, polycarbonate polyols, castor oil-based polyols and the like.

  The polyester polyol can be obtained, for example, by an esterification reaction of a polyol component and an acid component.

  Examples of the polyol component include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, and 2-butyl-2-ethyl-. 1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2- Examples thereof include methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, polypropylene glycol and the like.

  Examples of the acid component include succinic acid, methyl succinic acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, dimer acid, 2-methyl-1 2,4-cyclohexanedicarboxylic acid, 2-ethyl-1,4-cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid, 4,4'-biphenyldicarboxylic acid An acid, these acid anhydrides, etc. are mentioned.

  Examples of the polyether polyols include water, low molecular weight polyols (propylene glycol, ethylene glycol, glycerin, trimethylolpropane, pentaerythritol etc.), bisphenols (bisphenol A etc.), dihydroxybenzenes (catechol, resorcinol, hydroquinone etc.) The polyether polyol obtained by addition-polymerizing alkylene oxides, such as ethylene oxide, a propylene oxide, a butylene oxide, etc. is mentioned as an initiator, etc. is mentioned. Specifically, for example, polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like can be mentioned.

  As said polycaprolactone polyol, the caprolactone type polyester diol etc. which are obtained by the ring-opening polymerization of cyclic ester monomers, such as (epsilon) -caprolactone and (sigma)-valero lactone, etc. are mentioned, for example.

  As the polycarbonate polyol, for example, a polycarbonate polyol obtained by subjecting the polyol component and phosgene to a polycondensation reaction; the polyol component and the polyol component, dimethyl carbonate, diethyl carbonate, diprovir carbonate, diisopropyl carbonate, dibutyl carbonate, ethyl butyl carbonate, ethylene carbonate A polycarbonate polyol obtained by ester exchange condensation with a carbonate diester such as propylene carbonate, diphenyl carbonate, dibenzyl carbonate, etc .; a copolycarbonate polyol obtained by using two or more of the above-mentioned polyol components in combination; Polycarbonate polyols obtained by esterification reaction with containing compounds; Various polycarbonate polyols and hydroxyl group-containing compounds Polycarbonate polyols obtained by the etherification reaction; polycarbonate polyols obtained by the ester exchange reaction of the various polycarbonate polyols and ester compounds; polycarbonate polyols obtained by the ester exchange reaction of the various polycarbonate polyols and the hydroxyl group-containing compound Polyester-based polycarbonate polyols obtained by polycondensation reaction of the various polycarbonate polyols and dicarboxylic acid compounds; copolymerized polyether-based polycarbonate polyols obtained by copolymerizing the various polycarbonate polyols and alkylene oxides; .

  Examples of the castor oil-based polyol include castor oil-based polyols obtained by reacting castor oil fatty acid with the polyol component. Specifically, for example, a castor oil-based polyol obtained by reacting castor oil fatty acid and polypropylene glycol can be mentioned.

  As the polyol, it is preferable to use a polyol (triol) having three hydroxyl groups as an essential component from the viewpoint of removability and wettability of the pressure-sensitive adhesive composition to the adherend. The content of the polyol (triol) having 3 hydroxyl groups is preferably 50 to 100% by weight, and more preferably 70 to 100% by weight, with respect to the total amount of components constituting the polyol.

  Examples of the polyfunctional isocyanate compounds include aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanate compounds, and the like, and more specifically, the compounds exemplified in the cross-linking agent (B) A functional isocyanate type compound group is mentioned. Among them, aliphatic polyisocyanates and modified products thereof are preferable. Compared with other isocyanate crosslinking agents, aliphatic polyisocyanates and their modified products are more flexible in cross-linked structure, and are easier to relieve the stress associated with expansion / contraction of the optical film, and peeling occurs in the durability test It is difficult to do. Especially as aliphatic polyisocyanate and its modified substance, hexamethylene diisocyanate and its modified substance are preferable.

  The polyfunctional isocyanate compound and the polyol are equivalent to the isocyanate group of the polyfunctional isocyanate compound and the hydroxyl group equivalent of the polyol from the viewpoints of removability and wettability to the adherend of the pressure-sensitive adhesive composition. The ratio (NCO / OH) is preferably 1 to 5, more preferably 1.1 to 3, and even more preferably 1.2 to 2.

  The urethane-based pressure-sensitive adhesive composition preferably contains a catalyst of an iron-based compound and / or a tin-based compound. Specifically, iron-based compounds and tin-based compounds exemplified as the catalyst (C) of the above-mentioned acrylic adhesive composition may be mentioned.

  The content (use amount) of the catalyst contained in the urethane-based pressure-sensitive adhesive composition is preferably 0.002 to 0.5 parts by weight, and 0.005 to 0.3 parts by weight with respect to 100 parts by weight of the polyol. More preferably, 0.01 to 0.1 parts by weight is more preferable. Within this range, the rate of the crosslinking reaction is high when the pressure-sensitive adhesive layer is formed, and the pot life of the pressure-sensitive adhesive composition is extended, which is a preferable embodiment.

  The urethane-based pressure-sensitive adhesive composition preferably contains an anti-deterioration agent such as an antioxidant, an ultraviolet light absorber, or a light stabilizer. By including an anti-deterioration agent in the urethane-based pressure-sensitive adhesive composition, it is possible to be excellent in the adhesive residue prevention property, such as being unlikely to cause adhesive residue even when stored in a heated state after being attached to the adherend It can be.

  Examples of the antidegradants include antidegradants containing a compound having a hindered phenol structure. One type of antidegradant may be used, or two or more types may be used.

  Examples of the antidegradation agent containing a compound having a hindered phenol structure include, for example, large steric hindrance such as tertiary butyl group at least one of carbon atoms adjacent to aromatic ring carbon atoms to which OH group of phenol is bonded. Any antidegradant may be employed as long as it is an antidegradant comprising a compound having a hindered phenol structure to which a group is attached. By using a specific antidegradant such as antidegradant containing a compound having such a hindered phenol structure, it is considered that the effect of suppressing the molecular weight decrease of the polyol becomes very large compared to the prior art, and for this reason The present invention can exhibit the effect that the adhesive residue prevention property is far superior to the conventional one.

  The content of the anti-deterioration agent contained in the urethane-based pressure-sensitive adhesive composition is, for example, preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the polyol, from the viewpoint of preventing adhesive residue. 3 parts by weight is more preferable, and 0.1 to 1 part by weight is further preferable.

  The urethane-based pressure-sensitive adhesive composition can contain a fatty acid ester. By containing a fatty acid ester in the urethane-based pressure-sensitive adhesive composition, improvement in the wettability of the pressure-sensitive adhesive composition to the adherend can be expected.

  Examples of the fatty acid ester include polyoxyethylene bisphenol A laurate, butyl stearate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, monoglyceride behenate, cetyl 2-ethylhexanoate, isopropyl myristate, Isopropyl palmitate, cholesteryl isostearate, lauryl methacrylate, coconut fatty acid methyl, lauryl laurate, methyl oleate, methyl stearate, myristyl myristate, octyldodecyl myristate, pentaerythritol monooleate, pentaerythritol monostearate, penta Erythritol tetrapalmitate, stearyl stearate, isotridecyl stearate, triglyceride of 2-ethylhexanoate, La Butyl phosphate, octyl oleate. The fatty acid ester may be only one type or two or more types.

  The content of the fatty acid ester contained in the urethane-based pressure-sensitive adhesive composition is, for example, 100 parts by weight of a polyol from the viewpoint of the wettability of the pressure-sensitive adhesive composition to the adherend and the contamination of the adherend. 5 to 50 parts by weight is preferable, 10 to 40 parts by weight is more preferable, and 20 to 35 parts by weight is further preferable.

  The urethane-based pressure-sensitive adhesive composition may contain any appropriate component other than a polyol, a polyfunctional isocyanate-based compound, a catalyst, and an anti-deterioration agent, as long as the effects of the present invention are not impaired. As such other components, for example, resin components other than polyurethane resins, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, foils, softeners, plasticizers, conductive agents And surface lubricants, leveling agents, heat resistant stabilizers, polymerization inhibitors, lubricants, solvents and the like.

<Preparation of surface protection film for optics>
The optical surface protection film has a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition on one side of the polyester film, in which case the crosslinking of the pressure-sensitive adhesive composition by the crosslinking agent is adhesion Although it is common to carry out after the application of the agent composition, it is also possible to transfer the pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition after crosslinking onto a substrate or the like.

  The method for forming the pressure-sensitive adhesive layer on the polyester film is not particularly limited. For example, a solution of the pressure-sensitive adhesive composition is applied to the film, the polymerization solvent and the like are dried and removed, and the pressure-sensitive adhesive layer is polyester film It can be produced by forming it on top. Thereafter, curing may be performed for the purpose of adjusting the component transfer of the pressure-sensitive adhesive layer, adjusting the crosslinking reaction, and the like. In addition, when the pressure-sensitive adhesive composition is coated on a polyester film to produce a pressure-sensitive adhesive layer, one or more solvents other than the polymerization solvent are added to the pressure-sensitive adhesive composition so as to be uniformly coated on the polyester film. You may add it newly.

  Moreover, as a method for forming the pressure-sensitive adhesive layer, a known method used for producing the pressure-sensitive adhesive layer is used. Specific examples thereof include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, and extrusion coating using a die coater or the like.

  The thickness of the pressure-sensitive adhesive layer is preferably 3 to 100 μm, and more preferably about 5 to 50 μm. When the thickness of the pressure-sensitive adhesive layer is in this range, it is preferable because a balance between appropriate removability and adhesion (adhesion) can be easily obtained.

<Separator>
In the surface protection film for optics of the present invention, in order to protect the surface of the pressure-sensitive adhesive layer, a release layer of a separator is bonded to the surface of the pressure-sensitive adhesive layer to make an optical surface protection film with a separator. The separator comprises a substrate and a non-silicone release layer.

<Base material>
Examples of the substrate include paper and plastic films, but plastic films are preferably used in terms of excellent surface smoothness. The plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer, and examples thereof include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer A united film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, an ethylene-vinyl acetate copolymer film, etc. are mentioned.

  The thickness of the substrate is generally 5 to 200 μm, preferably 10 to 100 μm, and more preferably 20 to 50 μm. Within this range, the bonding workability to the pressure-sensitive adhesive layer and the peeling workability from the pressure-sensitive adhesive layer are excellent, which is preferable.

  The surface of the substrate may be subjected to various surface treatments such as corona discharge treatment or various surface treatments such as embossing, as necessary. In addition, if necessary, fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, ultraviolet light absorbers, antistatic agents, lubricants, plasticizers, coloring agents (pigments, dyes, etc.), etc. These various additives may be blended.

<Release layer>
The release layer has adhesion to the base material, has release properties to the pressure-sensitive adhesive layer, and does not contain a silicone-based material (for example, a siloxane component). Formed from the agent composition.

<Mold Release Agent Composition>
The release agent composition preferably contains a long chain alkyl material and / or an aliphatic carboxylic acid ester. The long-chain alkyl-based material and / or the aliphatic carboxylic acid ester is effectively included in the release agent composition to provide peelability effectively, and the coated layer formed from the release layer composition is uneven or not. It is preferable at the point from which the thing which has an external appearance without whitening etc. is obtained. The long chain alkyl material and / or the aliphatic carboxylic acid ester may be used alone or in combination of two or more.

<Long-chain alkyl material>
The long chain alkyl material is a compound having a linear or branched alkyl group having 6 or more carbon atoms, preferably 8 or more carbon atoms, and more preferably 12 or more carbon atoms. Examples of the alkyl group include octyl group, decyl group, lauryl group, octadecyl group and behenyl group. Examples of the compound having an alkyl group include various long-chain alkyl group-containing polymer compounds, long-chain alkyl group-containing amine compounds, long-chain alkyl group-containing ether compounds, long-chain alkyl group-containing quaternary ammonium salts and the like. . In view of heat resistance and contamination, a polymer compound is preferable. In addition, from the viewpoint that an appropriate water repellency can be effectively obtained with a small content, it is more preferable to be a polymer compound having a long chain alkyl group in a side chain.

  The polymer compound having a long chain alkyl group in the side chain is a (meth) acrylic polymer (i) obtained by polymerizing a monomer component containing an alkyl group-containing (meth) acrylic monomer having 6 or more carbon atoms And polymers (ii) which can be obtained by reacting a polymer having a reactive group with a compound having an alkyl group capable of reacting with the reactive group. As said reactive group, a hydroxyl group, an amino group, a carboxyl group, an acid anhydride etc. are mentioned, for example. Examples of compounds having these reactive groups include polyvinyl alcohol, butyral resin, ethylene-vinyl alcohol resin, polyethylene imine, polyethylene amine, reactive group-containing polyester resin, reactive group-containing poly (meth) acrylic resin, etc. It can be mentioned. Among them, in consideration of releasability and ease of handling, (meth) acrylic polymers, polyvinyl alcohols, butyral resins and ethylene vinyl alcohol resins are preferable.

<Alkyl group-containing (meth) acrylic polymer (i) having 6 or more carbon atoms>
The (meth) acrylic polymer obtained by polymerizing a monomer component containing an alkyl group-containing (meth) acrylic monomer having 6 or more carbon atoms is the total amount of monomer components constituting the (meth) acrylic polymer The alkyl group-containing (meth) acrylic monomer having 6 or more carbon atoms is preferably contained in an amount of 10 to 80% by weight, more preferably 20 to 70% by weight, still more preferably 30 to 70% by weight, Preferably, it is 30 to 60% by weight. When it exists in this range, the release layer obtained is excellent in the light releasability with respect to an adhesive layer.

  Examples of other polymerizable monomers other than the alkyl group-containing (meth) acrylic monomer having 6 or more carbon atoms include, for example, a hydroxyl group-containing (meth) acrylic monomer, a carboxyl group-containing (meth) acrylic monomer, cyano A group-containing monomer, a vinyl ester monomer, an aromatic vinyl monomer, an amide group-containing monomer, an imide group-containing monomer, an amino group-containing monomer, an epoxy group-containing monomer, N-acryloyl morpholine, a vinyl ether monomer and the like can be used as appropriate. These polymerizable monomers may be used alone or in combination of two or more.

  Among them, it is preferable to use a carboxyl group-containing (meth) acrylic monomer and a cyano group-containing monomer from the viewpoint of excellent light releasability of the optical surface protection film to the pressure-sensitive adhesive layer and adhesion to the separator substrate. Examples of the carboxyl group-containing (meth) acrylic monomer include (meth) acrylic acid, carboxylethyl (meth) acrylate, carboxylpentyl (meth) acrylate, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, 2- (Meth) acryloyloxypropyl hexahydrophthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyloxyethyl maleic acid, carboxypoly Examples thereof include caprolactone mono (meth) acrylate and 2- (meth) acryloyloxyethyl tetrahydrophthalic acid. Acrylonitrile and methacrylonitrile can be mentioned. Examples of cyano group-containing monomers include acrylonitrile and methacrylonitrile.

<Polymer (ii) which can also be obtained by reacting a polymer having a reactive group with a compound having an alkyl group capable of reacting with the reactive group>
The compounds having an alkyl group capable of reacting with the above-mentioned reactive groups are, for example, long chain alkyl group-containing isocyanates such as octyl isocyanate, decyl isocyanate, lauryl isocyanate, octadecyl isocyanate, behenyl isocyanate, octyl chloride, decyl chloride, Examples thereof include long-chain alkyl group-containing acid chlorides such as lauryl chloride, octadecyl chloride and behenyl chloride, long-chain alkyl group-containing amines, long-chain alkyl group-containing alcohols and the like. Among these, long-chain alkyl group-containing isocyanates are preferable in consideration of releasability and handling ease, and octadecyl isocyanate is particularly preferable.

  The compound having an alkyl group capable of reacting with the reactive group is preferably reacted with 100 to 1000 parts by weight, more preferably 200 to 800 parts by weight, with respect to 100 parts by weight of the polymer having the reactive group. 300 to 700 parts by weight is more preferable. Within this range, light releasability with respect to the pressure-sensitive adhesive layer and contamination of the pressure-sensitive adhesive layer of the optical surface protective film can be suppressed, which is preferable.

<Aliphatic carboxylic acid ester>
The aliphatic carboxylic acid ester is obtained by reacting an aliphatic carboxylic acid with an alcohol. The aliphatic carboxylic acid component is preferably a mono- or dicarboxylic acid having 6 to 36 carbon atoms, and more preferably an aliphatic saturated monocarboxylic acid having 6 to 36 carbon atoms. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, valeric acid, caproic acid, capric acid, capric acid, lauric acid, arachic acid, behenic acid, lignoceric acid, cerotic acid, melotic acid, tetraliacontanic acid And montanic acid, glutaric acid, adipic acid, azelaic acid and the like.

  On the other hand, as said alcohol, a saturated or unsaturated monohydric alcohol, a saturated or unsaturated polyhydric alcohol etc. can be mentioned. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these alcohols, monohydric or polyvalent saturated alcohols having 30 or less carbon atoms are preferable, and aliphatic saturated monohydric alcohols or polyhydric alcohols having 30 or less carbon atoms are more preferable. Here, aliphatic alcohols also include alicyclic alcohols. Specific examples of these alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, dipentaerythritol Etc. can be mentioned. These aliphatic carboxylic acid esters may contain aliphatic carboxylic acids and / or alcohols as impurities, and may be a mixture of a plurality of compounds.

  Specific examples of the aliphatic carboxylic acid ester include beeswax (mixture mainly composed of myricyl palmitate), stearyl stearate, behenyl behenate, octyldodecyl behenate, glycerin monopalmitate, glycerin monostearate, There may be mentioned glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate and pentaerythritol tetrastearate.

  The carboxylic ester is preferably contained in an amount of 70 to 99% by weight, more preferably 80 to 99% by weight, still more preferably 90 to 99% by weight, in the release agent composition. It is preferable from the point which is excellent in the light peelability with respect to an adhesive layer, when it exists in this range.

  Furthermore, the release agent composition may contain other known additives, and examples thereof include powders such as antistatic agents, colorants and pigments, surfactants, plasticizers and tackifiers. 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. It can add suitably according to the use which uses.

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

  There is no particular limitation on the method of forming the release layer on the substrate, but for example, a solution of the release agent composition is applied to the substrate, the polymerization solvent and the like are dried and removed, and the release layer is on the substrate. It is produced by forming it. Thereafter, curing may be performed for the purpose of adjustment of component transfer of the release layer. In addition, when a release agent composition is applied onto a substrate to produce a release layer, one or more kinds of components other than the polymerization solvent may be added to the release agent composition so as to be uniformly applied onto the substrate. A new solvent may be added.

  Moreover, as a method for forming the release layer, a known method used for producing a release layer is used. Specific examples thereof include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, and extrusion coating using a die coater or the like.

  The thickness of the release layer is typically 1 to 200 nm, preferably 5 to 100 nm, more preferably 10 to 50 nm. If the thickness of the release layer is too small, it may be difficult to separate the separator, which may make it difficult to attach the optical surface protective film. On the other hand, if it is too thick, the contamination of the pressure-sensitive adhesive layer of the optical surface protective film may be affected.

Bonding of a surface protection film for optics to a separator
The separator-equipped optical surface protection film of the present invention has a form obtained by bonding the pressure-sensitive adhesive layer of the optical surface protection film and the release layer of the separator. A well-known manufacturing method is used for bonding.

  The thickness (total thickness) of the separator-attached optical surface protective film is preferably 35 μm to 150 μm, more preferably 40 μm to 100 μm, and still more preferably 43 μm to 85 μm.

<Measurement of shear adhesion to separator of surface protective film for optics>
As shown in FIG. 2, the separator-attached optical surface protection film 3 of the present invention is cut into 10 mm × 50 mm, and a double-sided tape is attached to the separator 1 side of the 10 mm × 10 mm portion of the film. It fixed to 4 (70 mm long, 100 mm wide, 1 mm in thickness). The upper part of the acrylic plate 4 is held by a chuck, and the separator 1 in a portion not fixed by the acrylic plate 4 is cut, and the optical surface protection film 2 not bonded to the separator 1 is held by a chuck and fixed. The maximum value of the shear force at 0.06 m / min when pulled in the shear direction was taken as the shear adhesion (N / 10 mm).

  The shear adhesive strength of the optical surface protective film to the separator is 15 N / 10 mm or more, preferably 20 N / 10 mm or more, and more preferably 25 N / 10 mm or more. Within this range, the interface between the separator and the optical surface protective film is less likely to shift, and the stress when bending the optical surface protective film with a separator is less likely to be relieved. A surface protection film can be obtained and is preferred.

<Measurement of Peeling Force of Separator to Optical Surface Protective Film>
The surface protection film for optics with a separator of the present invention is bonded to a surface protection film for optics and a separator, and left at 23 ° C., 50% RH conditions for 20 minutes, peel angle 180 °, peel speed 0.3 m / min By peeling off the separator according to the conditions, it is possible to determine the peeling force (N / 50 mm) of the separator with respect to the optical surface protective film. The peeling force of the separator to the optical surface protective film is 0.3 N / 50 mm or less, preferably 0.2 N / 50 mm or less, and more preferably 0.1 N / 50 mm or less. Moreover, 0.02 N / 50 mm or more is preferable, and 0.03 N / 50 mm or more is more preferable. Within this range, the separator is excellent in the releasability with respect to the optical surface protective film, and the separator is also excellent in workability at the time of bonding.

<Measurement of Peeling Force of Optical Surface Protective Film to Glass>
In the separator-attached optical surface protection film of the present invention, the pressure-sensitive adhesive layer of the optical surface protection film from which the separator has been peeled is attached to the surface of a glass plate with a 2 kg roller, and then conditions of 23 ° C. and 50% RH. Peeling force (N / 25mm) of the surface protection film for optics by peeling off the surface protection film for optics on condition of exfoliation angle 180 degree and tensile speed 0.3m / min after 20 minutes progressing with Can. The peeling force of the optical surface protective film to glass is preferably 0.08 N / 25 mm or less, more preferably 0.10 N / 25 mm or less, still more preferably 0.08 N / 25 mm or less, 0.06 N / 25 mm The following is more preferable, and 0.04 N / 25 mm or less is the most preferable. Moreover, 0.01 N / 25 mm or more is preferable. If it exists in this range, it will become an adhesive layer excellent in the peelability with respect to the adherend of glass.

  Hereinafter, although the example etc. which show the composition and effect of the present invention concretely are described, the present invention is not limited to these. In addition, the evaluation item in an Example etc. measured as follows.

Example 1
<Preparation of (meth) acrylic polymer>
100 parts by weight of 2-ethylhexyl acrylate (2EHA, manufactured by Toagosei), 2-hydroxyethyl acrylate (HEA, manufactured by Toagosei, Axrix) in a square flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a cooler 4 parts by weight of HEA, 0.2 parts by weight of 2,2'-azobisisobutyronitrile (Wako Pure Chemical Industries, AIBN) as a polymerization initiator, and 205 parts by weight of ethyl acetate (manufactured by Showa Denko, ethyl acetate) While gently stirring, nitrogen gas was introduced, and the liquid temperature in the flask was maintained at around 63 ° C., and a polymerization reaction was carried out for about 4 hours to prepare a (meth) acrylic polymer solution (about 35% by weight). The weight average molecular weight (Mw) of the said (meth) acrylic-type polymer was 650,000, and Tg was -68.3 degreeC.

<Preparation of Acrylic Pressure-Sensitive Adhesive Composition>
The (meth) acrylic polymer solution (about 35% by weight) is diluted to 29% by weight with ethyl acetate, and 100 parts by weight (solid content) of the (meth) acrylic polymer of this solution is an isocyanate of hexamethylene diisocyanate. 4 parts by weight of a nurate body (Nippon Polyurethane Industry Co., Ltd., Coronate HX), 0.015 parts by weight of dioctyl tin laurate (manufactured by Tokyo Fine Chemical Co., Ltd., Envirizer OL-1) as a tin-based catalyst, and 3 parts by weight of acetylacetone as a crosslinking retarder In addition, the mixture was stirred at about 25 ° C. for about 1 minute to prepare an acrylic pressure-sensitive adhesive composition.

<Separator having non-silicone release layer>
As a separator having a non-silicone release layer, Diafoil T100H25 [UH18] (thickness 25 μm) manufactured by Mitsubishi Plastics, Inc. was used. The substrate is a polyester film, and the release layer is formed of a release agent composition containing pentaerythritol fatty acid ester and octadecyl isocyanate.

<Preparation of surface protection film for optics with a separator>
The acrylic pressure-sensitive adhesive composition was applied to one side of a polyester film (Mitsubishi resin, Diafoil T100C38, 38 μm thick) and heated at 130 ° C. for 60 seconds to form a 10 μm thick adhesive layer. Then, the release layer of the separator having the non-silicone release layer was attached to the surface of the pressure-sensitive adhesive layer with a hand roller, to prepare an optical surface protective film with a separator.

Examples 2 to 6
As shown in Table 1, Examples 2 to 6 were carried out in the same manner as in Example 1, except that the thickness of the monomer component constituting the (meth) acrylic polymer, various additives, and the pressure-sensitive adhesive layer were changed. An optical surface protection film with a separator was produced. In addition, the weight average molecular weight (Mw) of the acrylic polymer of Example 3 was 580,000, and Tg was -67.6 ° C. Moreover, the weight average molecular weight of the acrylic polymer of Example 4 is 610,000, Tg is -50.3 ° C, and as the iron-based catalyst, tris (acetylacetonato) iron (manufactured by Nippon Chemical Industrial Co., Ltd., trade name ""Nearsem ferric iron"), an epoxy-based crosslinking agent, tetrad C (made by Mitsubishi Gas Chemical Co., Ltd.), and a surfactant, Aqualon HS-10 (made by Dai-ichi Kogyo Seiyaku Co., Ltd.) were used.

Example 7
<Preparation of Urethane-Based Pressure-Sensitive Adhesive Composition>
As a polyol, 85 parts by weight of Preminor S3011 (Asahi Glass Co., Ltd., Mn = 10000, Triol), 13 parts by weight of Sannix GP3000 (Sanyo Chemical Industries, Mn = 3000, Triol), Sannicks GP1000 (Sanyo Chemical Industries, Ltd.) , Mn = 1000, triol) 2 parts by weight, and as a polyfunctional isocyanate compound, Coronate HX (Nippon Polyurethane Industry Co., Ltd.): 18 parts by weight, which is a polyfunctional alicyclic isocyanate compound, catalyst (manufactured by Nippon Chemical Industrial Co., Ltd.) , Trade name: Narsem ferric iron): 0.08 parts by weight, Irganox 1010 (manufactured by BASF): 0.5 parts by weight as an antidegradant, isopropyl myristate as an aliphatic carboxylic acid ester (manufactured by Kao, trade name: EXCEpearl IPM ): 30 parts by weight, as a dilution solvent Ethyl: by blending 210 parts by weight, and stirred with a disper, to obtain a urethane-based pressure-sensitive adhesive composition.

  The separator-equipped optical surface protection film of Example 7 was produced in the same manner as in Example 1 using the urethane-based pressure-sensitive adhesive composition.

<Comparative Examples 1 to 3>
<Separator having silicone-based release layer>
100 parts by weight of a silicone release agent (Shin-Etsu Chemical Co., Ltd., KS-847H), 3.3 parts by weight of a silicone curing catalyst (Shin-Etsu Chemical Co., Ltd., CAT-PL-50T), toluene (Idemitsu Petrochemical Co., Ltd.) Hexane (made by Maruzen Petrochemicals, normal hexane) and methyl ethyl ketone (made by Idemitsu Kosan, MEK) were diluted to 0.3% by weight with a mixed solvent of weight ratio 1: 2: 1 to obtain a releasing agent composition . This release agent composition is applied to a 38 μm thick polyester film (Mitsubishi resin, Diafoil T 100-25), dried at 130 ° C. for 1 minute, and having a silicone-based release layer for Comparative Examples 1 to 3. A separator was made. The thickness of the release layer after drying was 20 nm.

  Using the pressure-sensitive adhesive composition as shown in Table 1 and the separator having the silicone-based release layer, the optical surface protection film with a separator of Comparative Examples 1 to 3 was produced in the same manner as in Example 1. .

Comparative Example 4
Using the pressure-sensitive adhesive composition as shown in Table 1 and the separator having the non-silicone-based release layer, the separator-attached optical surface protection film of Comparative Example 4 was produced in the same manner as in Example 1. As the crosslinking agent (B), Coronate L (a trimer adduct of tolylene diisocyanate and trimethylolpropane, manufactured by Nippon Polyurethane Industry Co., Ltd.) was used.

  Specific measurement and evaluation methods are described below, and the results are shown in Table 1.

<Measurement of weight average molecular weight (Mw) of (meth) acrylic polymer>
The weight average molecular weight of the produced polymer was measured by GPC (gel permeation chromatography). The conditions are shown below.

Device: Tosoh Corporation HLC-8220 GPC
Sample column; Tosoh Corporation TSKguardcolumn Super HZ-H
(1) + TSKgel Super HZM-H (2)
Reference column; Tosoh TSKgel Super H-RC (1)
Flow rate: 0.6 ml / min
Injection volume: 10 μl
Column temperature: 40 ° C
Eluent: THF
Injection sample concentration: 0.2% by weight
Detector: Differential Refractometer In addition, the weight average molecular weight was calculated by polystyrene conversion.

<Measurement of glass transition temperature (Tg) of (meth) acrylic polymer>
The glass transition temperature (Tg) (° C.) was determined by the following equation using the following literature values as the glass transition temperature Tgn (° C.) of the homopolymer of each monomer.

Formula: 1 / (Tg + 273) = Σ [Wn / (Tgn + 273)]
(Wherein, Tg (° C.) is the glass transition temperature of the copolymer, Wn is the weight fraction of each monomer, Tgn (° C.) is the glass transition temperature of the homopolymer of each monomer, and n is the type of each monomer. )
2-ethylhexyl acrylate (2EHA): -70 ° C
Hydroxyethyl acrylate (HEA): -15 ° C
4-hydroxybutyl acrylate (HBA): -32 ° C
Acrylic acid (AA): 106 ° C
In addition, "the synthesis and design of acrylic resin and new application development" (published by Central Management Development Center Publishing Department) was referred to as the literature value.

<Measurement of shear adhesion to separator of surface protective film for optics>
As shown in FIG. 2, the obtained optical surface protection film with separator is cut into 10 mm × 50 mm, and a double-sided tape is attached to the separator side of the 10 mm × 10 mm portion thereof, and an acrylic plate (70 mm long, 100 mm wide) , 1 mm thick). The upper part of the acrylic plate is held by a chuck, and the separator not fixed by the acrylic plate is further cut, and the optical surface protection film not bonded to the separator is held between the chucks and fixed. Tension speed 0.06 m / min The maximum value of shear force when pulled in the shear direction was taken as the shear adhesion (N / 10 mm) to the separator of the optical surface protective film.

<Evaluation of handling property of optical surface protection film with separator>
The obtained separator-attached optical surface protective film with a separator was cut to 15 cm × 25 cm, wound with the optical surface protective film side inside, and formed into a cylindrical shape with a diameter of about 2 cm, and then released immediately. After release, an optical surface protection film with a separator returns to a sheet-like form is good (○), and a sheet which is deformed to not return to a sheet-like form is regarded as defective (×).

<Measurement of Peeling Force of Separator to Optical Surface Protective Film>
The obtained separator-attached optical surface protective film with a separator was cut to a width of 50 mm, and the opposite surface (polyester film) to the surface to which the adhesive layer was attached was fixed to a SUS plate (SUS304BA). After leaving in an environment of 23 ° C and relative humidity of 50% for about 20 minutes, the separator is peeled off at an angle of 180 ° at a speed of 0.3 m / min, and the peeling force of the separator against the optical surface protection film (N / 50 mm) Was measured.

<Evaluation of separator removability>
In the evaluation of the separator removability, those having a releasability of 0.3 N / 50 mm or less with respect to the surface protection film for optics of the separator were regarded as good (○) and those greater than 0.3 N / 50 mm were regarded as defective (×).

<Measurement of Peeling Force of Optical Surface Protective Film to Glass>
The resulting separator-attached optical surface protective film with separator is cut to a width of 25 mm, the separator is peeled off, and is bonded to a glass plate (Matsunami Glass, blue plate edge polishing product, OF1) using a 2 kg roller at 23 ° C. It was left in an environment of relative humidity 50% for about 20 minutes. Thereafter, the optical surface protective film was peeled at a speed of 0.3 m / min at an angle of 180 degrees, and the peeling force (N / 25 mm) of the optical surface protective film against glass was measured.

  From the results of Table 1 above, the shear adhesive strength to the separator of the optical surface protective film obtained in Examples 1 to 7 is 15 N / 10 mm or more, so the optical surface protective film with the separator is against external force. It was confirmed that it was hard to deform and was excellent in handling property. Moreover, since the peeling force with respect to the surface protection film for optics of the said separator is 0.3 N / 50 mm or less, it was confirmed that the said surface protection film for optics with a separator is excellent in the releasability with respect to the adhesive layer of a separator. .

  On the other hand, since the shear adhesion to the separator of the optical surface protective film obtained in Comparative Examples 1 to 3 is less than 15 N / 10 mm, the optical surface protective film with the separator is the same as that of the embodiment. In comparison, it was confirmed that they were easily deformed due to external force and inferior in handling property. Furthermore, since the peeling force of the separator obtained in Comparative Example 4 to the optical surface protective film is greater than 0.3 N / 50 mm, the separator-attached optical surface protective film with the separator is a separator compared to that of the example. It was confirmed that the releasability with respect to the pressure-sensitive adhesive layer was inferior.

1: Separator 2: Surface protection film for optics 3: Surface protection film for optics with separator 4: Acrylic board 11: Substrate 12: Release layer 21: Pressure-sensitive adhesive layer 22: Polyester film

Claims (5)

An optical surface protection film with a separator, comprising: an optical surface protection film having an adhesive layer on at least one side of a polyester film; and a separator on the surface of the adhesive layer opposite to the polyester film,
The pressure-sensitive adhesive layer is formed of an acrylic pressure-sensitive adhesive composition containing a (meth) acrylic polymer (A) and a crosslinking agent (B), and / or a urethane-based pressure-sensitive adhesive composition.
The separator has a substrate and a non-silicone release layer,
The non-silicone release layer is formed from a release agent composition containing a long chain alkyl group material and / or an aliphatic carboxylic acid ester,
The shear adhesion of the optical surface protective film to the separator is at least 15 N / 10 mm at a tensile speed of 0.06 m / min, and
The separator-provided optical surface protection film with a separator characterized in that the peeling force of the separator to the optical surface protection film is 0.3 N / 50 mm or less at a peeling angle of 180 degrees and a peeling speed of 0.3 m / min. Before SL (meth) acrylic polymer (A) comprises as a monomer component, containing alkyl group having 2 to 14 carbon atoms (meth) acrylic monomer, and a functional group-containing (meth) acrylic monomer,
Relative to the alkyl group-containing (meth) 100 parts by weight of the acrylic monomer of the 2 to 14 carbon atoms, the functional group-containing (meth) acrylic monomer to claim 1, characterized in that it contains 2 to 20 parts by weight The optical surface protection film with a separator as described. The optical surface protection film with a separator according to claim 1 or 2 , wherein the crosslinking agent (B) is a polyfunctional isocyanate compound and / or a polyfunctional epoxy compound. 4. The method according to claim 3 , wherein 2 to 25 parts by weight of the polyfunctional isocyanate compound and / or the polyfunctional epoxy compound is contained with respect to 100 parts by weight of the (meth) acrylic polymer (A). The optical surface protection film with a separator as described. The urethane-based pressure-sensitive adhesive composition contains a polyol, a polyfunctional isocyanate-based compound, a catalyst, and an anti-deterioration agent,
The catalyst is an iron-based compound and / or a tin-based compound,
5. The separator-equipped optical device according to claim 1 , wherein an equivalent ratio (NCO / OH) of an isocyanate group of the polyfunctional isocyanate compound and a hydroxyl group of the polyol is 1 to 5. Surface protection film.

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