JP6692968B2 - Optical surface protection film with separator - Google Patents

Description

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

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

  In general, an optical surface protective film is attached to an optical member, an electronic member, or the like during processing, assembly, inspection, transportation, or the like in order to prevent scratches on their exposed surfaces. The optical surface protection film is composed of a substrate film and an adhesive layer, and if necessary, for the purpose of protecting the adhesive layer before being attached (used), a separator (release film, or (Also referred to as a release liner) is laminated to produce an optical surface protective film with a separator (Patent Document 1). The optical surface protective film with a separator is attached to an optical member that is an adherend after the separator is peeled off.

  The adhered optical surface protection film is peeled from the optical member when it is no longer needed, and then a layer having another function (other layer) is provided on the surface of the optical member after peeling. There are cases (Patent Document 2).

JP2012-224811A JP, 2014-208756, A

  However, depending on the state of the surface of the optical member (adherend) after the optical surface protective film is peeled off, the wettability and the adhesiveness to other layers may be deteriorated, so that the other layers may not be optical members. There is a problem that the product may be defective because it may come off. In particular, in the 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 adhesive layer of the surface protection film. Therefore, the surface of the optical member (adherend) after the optical surface protection film is peeled off is contaminated with the silicone-based material, so that the above-mentioned problem becomes remarkable.

  On the other hand, the total thickness of the optical surface protective film with a separator tends to be thin due to the demand for cost reduction and thinning. However, when the total thickness is thin, the optical surface protective film with a separator is easily deformed by an external force, and as a result, the handling property of the optical surface protective film with a separator is reduced (for example, the optical surface protective film with a separator is There is a problem that once it is rolled into a tubular shape, it does not return to its original shape by curling.

  The present invention, in the optical surface protective film with a separator, in the case where the surface of the optical member (adherend) is not contaminated with a silicone-based material, and the total thickness of the optical surface protective film with a separator is reduced. Also, an object of the present invention is to provide an optical surface protection film with a separator in which the optical surface protection film with a separator is unlikely to be deformed by an external force.

  In view of the above circumstances, the present inventors have made extensive studies, and as a result, in an optical surface protective film with a separator, the pressure-sensitive adhesive layer of the optical surface protective film has a shear adhesive force (shear force) to the release layer of the separator. ) To a certain value or more, it becomes difficult to cause a deviation at the interface between the pressure-sensitive adhesive layer and the release layer, so that an external force was applied to the optical surface protection film with a separator (for example, the film was bent). Even in the case, as a result that the stress is not relieved, even when the total thickness of the optical surface protective film with a separator is reduced, it is possible to prevent the deterioration of the handling property due to the deformation of the optical surface protective film with a separator, In addition, by keeping the peeling force of the separator against the optical surface protection film below a certain level, the optical surface protection film is It found that arm and the separators is excellent in peeling property, and have completed the present invention.

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

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

  In the optical surface protective film with a separator of the present invention, the pressure-sensitive adhesive layer is formed from an acrylic pressure-sensitive adhesive composition containing a (meth) acrylic polymer (A) and a crosslinking agent (B), and the (meth) acrylic The polymer (A) contains, as a monomer component, 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 having 2 to 14 carbon atoms is contained. It is preferable to contain 2 to 20 parts by weight of the functional group-containing (meth) acrylic monomer with respect to 100 parts by weight of the (meth) acrylic monomer.

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

  The optical surface protective film with a separator of the present invention has 2 to 25 parts 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 a part.

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

  In the optical surface protective film with a separator of the present invention, the urethane adhesive composition contains a polyol, a polyfunctional isocyanate compound, a catalyst, and a deterioration inhibitor, and the catalyst is an iron compound, and / or tin. It is a system compound, and the equivalent ratio (NCO / OH) of the isocyanate group of the polyfunctional isocyanate compound and the hydroxyl group of the polyol is preferably 1 to 5.

  The optical surface protective film with a separator of the present invention, after the pressure-sensitive adhesive layer of the optical surface protective film is attached to the optical member (adherend), the surface of the adherend is contaminated with the silicone-based material by the adhesive layer. Without, and because the optical surface protection film with a separator is difficult to be deformed by an external force, the handling property of the optical surface protection film with a separator does not deteriorate, and in addition, it has excellent releasability from the optical surface protection film of the separator. Therefore, it is useful.

It is a typical sectional view showing one example of composition of an optical surface protection film 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.

<Overall structure of optical surface protection film with separator>
A typical configuration example of the optical surface protection film with a separator of the present invention is schematically shown in FIG. The optical surface protection film 3 with a separator has a form in which the separator 1 and the optical surface protection film 2 are laminated. The separator 1 includes a base material 11 and a release layer 12, the optical surface protection film 2 includes a polyester film 22 and a pressure-sensitive adhesive layer 21 provided on one surface thereof. The agent layer 21 is laminated. The optical surface protection film 3 with a separator is an optical member that is an adherend to which the pressure-sensitive adhesive layer 21 is adhered after the separator 1 is peeled off (protection target, such as glass used in liquid crystal displays, polarizing plates, wave plates, retardation films, retardation films). It is used by being attached to the surface of optical components such as a plate, an optical compensation film, a reflection sheet, a brightness enhancement film, and a transparent conductive film, and peeled from the optical member when it is no longer needed. The optical surface protective film 3 with a separator has the adhesive layer 2 on both sides of the polyester film 22, or has an antistatic layer on the opposite surface of the polyester film 22 to which the adhesive layer 2 is attached. Is 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 protective film of the present invention is an optical component (for example, glass used for liquid crystal displays, a polarizing plate, a wave plate, a retardation plate, an optical compensation film, a reflection sheet, a brightness enhancement film, a transparent conductive film, etc. The optical surface protective film that protects the surface of the optical component during processing or transportation of the optical component) is generally called an optical pressure-sensitive adhesive sheet, an optical pressure-sensitive adhesive tape, an optical pressure-sensitive adhesive label, an optical pressure-sensitive adhesive film, or the like. It is of the form The pressure-sensitive adhesive layer in the optical surface protection film is typically formed continuously, but is not limited to such a form, and is formed in a regular or random pattern such as dots or stripes. It may be a pressure-sensitive adhesive layer. Further, the optical surface protective film may be in a roll shape or a sheet shape.

<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), and polybutylene terephthalate as a main resin component. Can be mentioned. The polyester film has excellent optical characteristics and dimensional stability.

  The resin material constituting the polyester film may be mixed with various additives such as an antioxidant, an ultraviolet absorber, a plasticizer, and a coloring agent (pigment, dye, etc.), if necessary. The first surface of the polyester film may be subjected to a known or common surface treatment such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and application of an undercoating agent. Such a surface treatment may be, for example, a treatment for improving the adhesion between the polyester film and the pressure-sensitive adhesive layer (anchoring property of the pressure-sensitive adhesive layer). A surface treatment in which a polar group such as a hydroxyl group is introduced on the surface of the polyester film can be preferably adopted. Further, the second surface of the polyester film may be subjected to the same surface treatment as the first surface to provide an adhesive layer or an antistatic layer.

  The optical surface protective film of the present invention can have an antistatic function by providing the antistatic layer on the surface of the polyester film opposite to the surface having the adhesive layer. Also, a polyester film which has been subjected to antistatic treatment in advance may be used. By using the polyester film, charging is suppressed when the separator is peeled off or when the pressure-sensitive adhesive layer is peeled off from the adherend optical member, which is preferable. The method for imparting the antistatic function is not particularly limited, and a conventionally known method can be used. For example, an antistatic resin or conductive polymer composed of an antistatic agent and a resin component, or a conductive substance can be used. Examples thereof include a method of applying a conductive resin contained therein, a method of vapor depositing or plating a conductive substance, and a method of kneading an antistatic agent and the like.

  The thickness of the polyester film is usually 5 to 200 μm, preferably 10 to 100 μm, and more preferably 15 to 50 μm. When the thickness of the polyester film is within the above range, the workability of attaching to the optical member that is the adherend and the workability of peeling from the optical member are excellent, which is preferable.

<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 containing no silicone-based material (for example, a siloxane component). Is preferred. Examples of the adhesive composition include acrylic adhesive compositions, urethane adhesive compositions, synthetic rubber adhesive compositions, natural rubber adhesive compositions, and the like, among which transparency and heat resistance From the viewpoint of removability (peeling the optical surface protective film from the adherend), an acrylic pressure-sensitive adhesive composition and a urethane pressure-sensitive adhesive composition can be preferably used.

<Acrylic adhesive composition>
The acrylic pressure-sensitive adhesive composition contains a (meth) acrylic polymer (A) and a crosslinking agent (B). The (meth) acrylic polymer means 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 an adhesive (meth) acrylic polymer, but as a monomer component, an alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms. Is preferably used. The alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms can be used alone or in combination of two or more, and can be used as the main component in the monomer components. The main component means that the blending ratio is the highest.

<Alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms>
Specific examples of the alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms include, for example, ethyl (meth) acrylate, n-butyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl ( (Meth) 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, 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). ) Acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, n-tetradecyl (meth) acrylate and the like, which contains an alkyl group-containing (meth) acrylic monomer having 6 to 14 carbon atoms. It can be mentioned as a suitable one. By using a (meth) acrylic monomer having an alkyl group having 6 to 14 carbon atoms, it becomes easy to control the adhesive force to an adherend to be low, and the adhesive layer has excellent removability.

  The (meth) acrylic polymer (A) contains an alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms, based on the total amount of the monomer components constituting the (meth) acrylic polymer (A). The content is preferably 50 to 99% by weight, more preferably 60 to 98% by weight, further preferably 70 to 97% by weight, and most preferably 80 to 96% by weight. Within this range, the pressure-sensitive adhesive composition has appropriate wettability and is excellent in cohesive force of the pressure-sensitive adhesive layer, which is preferable.

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

<Hydroxyl group-containing (meth) acrylic monomer>
By using the above-mentioned hydroxyl group-containing (meth) acrylic monomer, it is possible to easily control the crosslinking of the hydroxyl group, and thus improve the wettability by flow and balance the cohesive force and shear adhesive force of the pressure-sensitive adhesive layer. Will be easier to control. Furthermore, when an antistatic agent is added to the pressure-sensitive adhesive layer, unlike a carboxyl group or a sulfonate group that can generally act as a cross-linking site, a hydroxyl group has an appropriate interaction with an ionic compound that is an antistatic agent. Since it has, it can be preferably used also in terms of antistatic property.

  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-hydroxylauryl (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 force, and can further prevent the increase of the adhesive force over time, and the removability, the adhesive force increase preventive property, and the workability. It becomes 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, it is possible to suppress curling due to the adherend, and between the pressure-sensitive adhesive layer and the adherend ( The occurrence of slippage and displacement at the interface) can be suppressed.

  Examples of the carboxyl group-containing (meth) acrylic monomer include (meth) acrylic acid, carboxylethyl (meth) acrylate, carboxylpentyl (meth) acrylate, 2- (meth) acryloyloxyethylhexahydrophthalic acid, 2 -(Meth) acryloyloxypropyl hexahydrophthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyloxyethyl maleic acid, carboxy Examples thereof include polycaprolactone mono (meth) acrylate and 2- (meth) acryloyloxyethyl tetrahydrophthalic acid. 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 to 100 parts by weight of the alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms. ˜15 parts by weight, more preferably 4 to 12 parts by weight. Within this range, the balance between the wettability of the pressure-sensitive adhesive composition and the cohesive force or shear adhesive force of the pressure-sensitive adhesive layer can be easily controlled, and the removability and the increase in pressure-sensitive adhesiveness can be excellent, which is preferable.

<Other polymerizable monomers>
Other polymerizable monomers can be used as the monomer component in the (meth) acrylic polymer (A) without particular limitation, as long as they do not impair the characteristics of the present invention. For the reason that the other (meth) acrylic polymer (A) has a Tg of −50 ° C. or lower and −100 ° C. or higher, the other polymerizable monomers have a glass transition temperature or It can be used to adjust the peelability.

  As the other polymerizable monomer, for example, a cyano group-containing monomer, a vinyl ester monomer, a cohesive force / heat resistance improving component such as an aromatic vinyl monomer, an amide group-containing monomer, an imide group-containing monomer, an amino group-containing monomer, A component having a functional group such as an epoxy group-containing monomer, N-acryloylmorpholine, and vinyl ether monomer, which has a functional group that acts as a base point for improving adhesiveness (adhesion) or a cross-linking group, can be appropriately 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, vinyl laurate and the like.

  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, diethylacrylamide, N-vinylpyrrolidone, N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, N, N-diethylacrylamide, N, N-diethyl. Methacrylamide, N, N'-methylenebisacrylamide, N, N-dimethylaminopropyl acrylamide, N, N-dimethylaminopropyl methacrylamide, diacetone acrylamide and the like can be mentioned.

  Examples of the imide group-containing monomer include cyclohexylmaleimide, isopropylmaleimide, N-cyclohexylmaleimide, and itaconimide.

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

  Examples of the epoxy group-containing monomer include glycidyl (meth) acrylate, methylglycidyl (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.

  The amount of the other polymerizable monomer is preferably 0.01 to 10% by weight, and more preferably 0.05 to 5% by weight, based on the total amount of the monomer components constituting the (meth) acrylic polymer (A). Is more preferable. By using the other polymerizable monomer within this range, for example, when using an ionic compound as an antistatic agent, it is necessary to appropriately adjust good interaction with this compound and good removability. You 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 further preferably 300,000 to 3,000,000. When the weight average molecular weight is less than 100,000, the cohesive force of the pressure-sensitive adhesive composition becomes small, and adhesive residue tends to occur. On the other hand, when the weight average molecular weight (Mw) exceeds 5,000,000, the fluidity of the polymer is lowered and the adherend (for example, a polarizing plate which is an optical member) is insufficiently wetted and adheres to the adherend. It tends to cause blistering that occurs between the agent layer. The weight average molecular weight (Mw) means that obtained by measurement by GPC (gel permeation chromatography).

  The glass transition temperature (Tg) of the (meth) acrylic polymer (A) is preferably −50 ° C. or lower, more preferably −55 ° C. or lower, and further preferably −60 ° C. or lower. The glass transition temperature (Tg) of the (meth) acrylic polymer is preferably −100 ° C. or higher. When the glass transition temperature is higher than −50 ° C., the polymer is hard to flow, and, for example, the adherend (for example, a polarizing plate which is an optical member) is insufficiently wet, and the adherend and the pressure-sensitive adhesive layer are separated from each other. It tends to cause blisters that occur between. In particular, by setting the glass transition temperature to -61 ° C or lower, it becomes easy to obtain a pressure-sensitive adhesive composition having excellent wettability to an adherend and light releasability. The glass transition temperature of the (meth) acrylic polymer (A) can be adjusted within the above range by appropriately changing the monomer components used and the composition ratio.

  The method of polymerizing the (meth) acrylic polymer (A) is not particularly limited, and it can be polymerized by a known method such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization, etc. From the viewpoint of characteristics such as low contamination to adherends, solution polymerization is a more preferable embodiment. Further, the obtained polymer 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 cross-linking 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 the use of an isocyanate compound and / or an epoxy compound is particularly preferable. It becomes a mode. These compounds may be used alone or in combination of two or more.

<Polyfunctional isocyanate compound>
As the isocyanate compound, a polyfunctional isocyanate compound having at least two isocyanate groups in one molecule can be used. For example, known aliphatic polyisocyanate, alicyclic polyisocyanate, aromatic polyisocyanate 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, 2,4,4- Examples include trimethylhexamethylene diisocyanate.

  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 diisocyanate. Isocyanate hydrogenated tetramethyl xylylene diisocyanate and the like can be mentioned.

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

Examples of the polyfunctional isocyanate-based compound include multimers of the above diisocyanates (dimers, trimers, pentamers, etc.), urethane modified products obtained by reacting with polyhydric alcohols such as trimethylolpropane, and urea modified products. Body, biuret modified product, alphanate modified product, isocyanurate modified product, carbodiimide modified product and the like.

  Examples of commercially available products of the polyfunctional isocyanate compound include trade names “Millionate MT”, “Millionate MTL”, “Millionate MR-200”, “Millionate MR-400”, “Coronate L”, “Coronate HL”, and “Coronate HX” [above. , Manufactured by Nippon Polyurethane Industry Co., Ltd .; trade name “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, manufactured by Mitsui Chemicals, Inc.] and the like. These compounds may be used alone or in combination of two or more.

  As the polyfunctional isocyanate compound, aliphatic polyisocyanates and modified products thereof are preferable. The aliphatic polyisocyanate and its modified products have a more flexible cross-linking structure than other isocyanate-based cross-linking agents, easily relax the stress associated with the expansion / contraction of the optical film, and cause no peeling in the durability test. Hard to do. As the aliphatic polyisocyanate and its modification, hexamethylene diisocyanate and its modified product are particularly preferable.

<Polyfunctional epoxy compounds>
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, diglycidylaniline, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, and , 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 Diether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, triglycidyl-tris (2-hydroxyethyl) isocyanurate, resorcin diglycidyl ether, bisphenol-S-diglycidyl ether, and an epoxy group in the molecule. Examples thereof include epoxy resins having two or more of Further, commercially available products such as trade name "Tetrad C" (manufactured by Mitsubishi Gas Chemical Co., Inc.) are also included.

  The content of the polyfunctional isocyanate-based compound and / or the epoxy-based compound is, relative to 100 parts by weight of the (meth) acrylic polymer (A), from the viewpoints of removability and low contamination to an adherend. The amount is preferably 2 to 25 parts by weight, 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. Examples of the catalyst (C) include tin-based catalysts such as dibutyltin dilaurate and dioctyltin dilaurate, tris (acetylacetonato) iron, tris (hexane-2,4-dionate) iron, tris (heptane-2,4). -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 (acetoacetate) iron, tris (acetoacetate-n-propyl) iron, tris (isopropylacetoacetate) iron, tris (acetoacetate-n-butyl) Iron, tris (acetoacetate-sec-butyl) iron, tris (acetoacetate-tert-butyl) iron, tris (propionylmethylacetate) iron, tris (propionylethylacetate) iron, tris (propionylacetate-n-propyl) 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 iron triethoxy, iron triisopropoxy, and ferric chloride can be used. The catalyst (C) may be used alone or in combination of two or more.

Further, as the iron-based catalyst, an iron chelate compound can be preferably used, and can be represented by, for example, a general formula Fe (X) (Y) (Z). The iron chelate compound is a combination of (X) (Y) (Z), and Fe (X) 3, Fe (X) 2 (Y), Fe (X) (Y) 2, Fe (X) (Y) (Z ). Iron chelate compound Fe (X) (Y)
In (Z), each of (X) (Y) (Z) is a ligand for Fe. For example, when X, Y or Z is β-diketone, β-diketone may be 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-tetramethylheptane-3,5-dione, tridecane- 6,8-dione, 1-phenyl-butane-1,3-dione, hexafluoroacetylacetone, ascorbic acid and the like can be mentioned.

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

  Further, an iron-based catalyst other than the iron chelate compound may be used, and for example, a compound of iron and an alkoxy group, a halogen atom, or an acyloxy group may be used. In the case of a compound of iron and an alkoxy group, as the 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 the compound of iron and an acyloxy group, as an acyloxy group, 2-ethylhexylic acid, octylic acid, naphthenic acid, resin acid (abietic acid, neoabietic acid, d-pimaric acid, iso-d-pimaric acid, podocarpic acid) , Gluconic acid, fumaric acid, citric acid, aspartic acid, α-ketoglutamic acid, malic acid, succinic acid, aliphatic organic acids mainly containing amino acids such as glycine and histidine, benzoic acid, cinnamic acid, p -Aromatic fatty acids containing oxycinnamic acid as a main component) and the like.

  Among the iron-based catalysts, an iron chelate compound having β-diketone as a ligand is preferable from the viewpoint of reactivity and curability, and tris (acetylacetonato) iron is particularly preferably used.

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

<Crosslink retarder>
Further, the acrylic pressure-sensitive adhesive composition may contain a compound that causes 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 by blending a polyfunctional isocyanate-based compound, it is preferable to adopt an embodiment including a compound that produces the keto-enol tautomerism. You can As a result, it is possible to achieve an effect of suppressing an excessive increase in viscosity and gelation of the pressure-sensitive adhesive composition after blending the polyfunctional isocyanate compound and extending the pot life of the pressure-sensitive adhesive composition. 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 solvent-free form.

  As the compound that causes the keto-enol tautomerism, various β-dicarbonyl compounds can be used. Specific examples 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 and tert-butyl acetoacetate; ethyl propionyl acetate, ethyl propionyl acetate, isopropyl propionyl acetate, propionyl acetic acid Propionyl acetates such as tert-butyl; Isobutyryl acetates such as ethyl isobutyryl acetate, ethyl isobutyryl acetate, isopropyl isobutyryl acetate, tert-butyl isobutyryl acetate; Malonates such as methyl malonate and ethyl malonate; And the like. Among them, preferable compounds include acetylacetone and acetoacetic acid esters. The keto-enol tautomeric compounds 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 0.1. It is suitable that the amount is 5 to 15 parts by weight (for example, 1 to 10 parts by weight). If the amount of the compound is too small, it may be difficult to exert a sufficient use effect. On the other hand, if the compound is used in an unnecessarily large amount, it may remain in the pressure-sensitive adhesive layer and reduce the cohesive force.

<Surfactant>
Further, the acrylic pressure-sensitive adhesive composition may contain a surfactant from the viewpoints of removability and improvement of wettability of the pressure-sensitive adhesive composition to an adherend. Examples of the surfactant include known anionic surfactants, nonionic surfactants, and cationic surfactants. The surfactants may be used alone or in combination of two or more.

  Examples of the anionic surfactant include fatty acid soap, rosin acid soap, sodium naphthalenesulfonate formalin condensate, sodium alkylbenzenesulfonate, sodium alkylsulfate such as sodium dodecylsulfate, ammonium alkylsulfate, triethanolamine alkylsulfate, and dialkylsulfosuccinic acid. Sodium, sodium alkyldiphenyl ether disulphonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkylphenyl ether sulfate, ammonium polyoxyethylene alkylpropenyl phenyl ether sulfate and the like can be mentioned.

  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, alkyl alkanolamides, acetylene dialcohol polyether compound compositions, and the like.

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

  The content of the surfactant may be, for example, 0.01 to 10 parts by weight, and usually 0.1 to 1 part by weight, based on 100 parts by weight of the (meth) acrylic polymer (A). Is appropriate.

  Further, the acrylic pressure-sensitive adhesive composition may contain other known additives, for example, colorant, powder such as pigment, plasticizer, antistatic agent, tackifier, 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 Etc. can be appropriately added depending on the intended use.

<Urethane 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 a deterioration inhibitor.

  As the polyol, any appropriate polyol can be adopted as long as it is a polyol having two or more hydroxyl groups. Examples of such a polyol include a polyol (diol) having two hydroxyl groups, a polyol (triol) having three hydroxyl groups, a polyol (tetraol) having four hydroxyl groups, and a polyol having five hydroxyl groups. (Pentaol), polyol having 6 hydroxyl groups (hexaol), and the like. As the polyol, only one kind may be used, or two or more kinds may be used.

  The polyol preferably includes 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, and further preferably 90 to 100% by weight. 100% by weight, particularly preferably 95 to 100% by weight, 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 having excellent reworkability, initial wettability, and transparency is provided. can do.

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

  The polyester polyol can be obtained, for example, by an esterification reaction between 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, 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- Methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, polypropylene glycol and the like can be mentioned.

  Examples of the acid component include succinic acid, methylsuccinic acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, dimer acid, and 2-methyl-1. , 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 Acids, these acid anhydrides, etc. are mentioned.

  Examples of the polyether polyol include water, low molecular weight polyols (propylene glycol, ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, etc.), bisphenols (bisphenol A, etc.), dihydroxybenzene (catechol, resorcin, hydroquinone, etc.). Examples thereof include polyether polyols obtained by addition-polymerizing alkylene oxides such as ethylene oxide, propylene oxide and butylene oxide. Specific examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and the like.

  Examples of the polycaprolactone polyol include caprolactone-based polyester diols obtained by ring-opening polymerization of cyclic ester monomers such as ε-caprolactone and σ-valerolactone.

  As the polycarbonate polyol, for example, a polycarbonate polyol obtained by polycondensation reaction of the polyol component and phosgene; the polyol component and dimethyl carbonate, diethyl carbonate, diprobyl carbonate, diisopropyl carbonate, dibutyl carbonate, ethylbutyl carbonate, ethylene carbonate , A polycarbonate polyol obtained by transesterification condensation with a carbonic acid diester such as propylene carbonate, diphenyl carbonate and dibenzyl carbonate; a copolycarbonate polyol obtained by using two or more of the above polyol components in combination; the various polycarbonate polyols and a carboxyl group Polycarbonate polyol obtained by esterification reaction with a containing compound; the above-mentioned various polycarbonate polyols and a hydroxyl group-containing compound A polycarbonate polyol obtained by an etherification reaction of: a polycarbonate polyol obtained by an ester exchange reaction between the various polycarbonate polyols and an ester compound; a polycarbonate polyol obtained by an ester exchange reaction between the various polycarbonate polyols and a hydroxyl group-containing compound A polyester-based polycarbonate polyol obtained by polycondensing the above-mentioned various polycarbonate polyols and a dicarboxylic acid compound; a copolymerized polyether-based polycarbonate polyol obtained by copolymerizing the above-mentioned various polycarbonate polyols and an alkylene oxide; ..

  Examples of the castor oil-based polyol include castor oil-based polyols obtained by reacting castor oil fatty acid with the polyol component. Specific examples include castor oil-based polyols obtained by reacting castor oil fatty acid with polypropylene glycol.

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

  Examples of the polyfunctional isocyanate compound include an aliphatic polyisocyanate, an alicyclic polyisocyanate, an aromatic polyisocyanate compound, and the like, and specifically, the polyfunctional isocyanates exemplified in the cross-linking agent (B). A functional isocyanate type compound group is mentioned. Of these, aliphatic polyisocyanates and modified products thereof are preferable. The aliphatic polyisocyanate and its modified products have a more flexible cross-linking structure than other isocyanate-based cross-linking agents, easily relax the stress associated with the expansion / contraction of the optical film, and cause no peeling in the durability test. Hard to do. As the aliphatic polyisocyanate and its modified product, hexamethylene diisocyanate and its modified product are particularly preferable.

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

  The urethane adhesive composition preferably contains a catalyst of an iron compound and / or a tin compound. Specifically, the iron-based compounds and the tin-based compounds exemplified as the catalyst (C) of the acrylic pressure-sensitive adhesive composition described above can 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 part by weight, and 0.005 to 0.3 part by weight, based on 100 parts by weight of the polyol. More preferably, 0.01 to 0.1 parts by weight is even more preferable. Within this range, the speed of the crosslinking reaction is high when the pressure-sensitive adhesive layer is formed, and the pot life of the pressure-sensitive adhesive composition becomes long, which is a preferred embodiment.

  The urethane-based pressure-sensitive adhesive composition preferably contains a deterioration inhibitor such as an antioxidant, an ultraviolet absorber or a light stabilizer. By including a deterioration inhibitor in the urethane-based pressure-sensitive adhesive composition, it is possible to prevent adhesive residue from being left on the adherend even if the adhesive composition is adhered to the adherend and stored in a heated state, and thus has excellent adhesive residue prevention properties. Can be.

  Examples of the deterioration inhibitor include a deterioration inhibitor containing a compound having a hindered phenol structure. The deterioration preventing agent may be only one kind or two or more kinds.

  Examples of the deterioration inhibitor containing a compound having a hindered phenol structure include, for example, at least one of the carbon atoms adjacent to the carbon atom on the aromatic ring to which the OH group of phenol is bonded, and a large steric hindrance such as a tertiary butyl group. Any appropriate deterioration preventing agent can be adopted as long as it is a deterioration preventing agent containing a compound having a hindered phenol structure in which groups are bonded. By using a specific deterioration inhibitor called a deterioration inhibitor containing a compound having such a hindered phenol structure, it is considered that the effect of suppressing the decrease in the molecular weight of the polyol becomes extremely large as compared with the conventional one, and for this reason In addition, it is possible to exert an effect that the adhesive residue prevention property is remarkably superior to the conventional one.

  The content of the deterioration inhibitor contained in the urethane-based pressure-sensitive adhesive composition is preferably 0.01 to 5 parts by weight, and preferably 0.03 to 100 parts by weight, from the viewpoint of adhesive residue prevention properties. 3 parts by weight is more preferable, and 0.1 to 1 part by weight is further preferable.

  The urethane adhesive composition may include a fatty acid ester. By including a fatty acid ester in the urethane-based pressure-sensitive adhesive composition, it is expected that the wettability of the pressure-sensitive adhesive composition to the adherend is improved.

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

  The content of the fatty acid ester contained in the urethane-based pressure-sensitive adhesive composition is, from the viewpoint of the wettability of the pressure-sensitive adhesive composition to the adherend and the contamination of the adherend, for example, relative to 100 parts by weight of the polyol. 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 other component other than the polyol, the polyfunctional isocyanate-based compound, the catalyst, and the deterioration inhibitor within a range that does not impair the effects of the present invention. Examples of such other components include resin components other than polyurethane resins, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, foils, softeners, plasticizers, and conductive agents. , Surface lubricants, leveling agents, heat stabilizers, polymerization inhibitors, lubricants, solvents and the like.

<Production of optical surface protection film>
The surface protective film for optics has a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition on one surface of the polyester film, in which case crosslinking by a cross-linking agent of the pressure-sensitive adhesive composition is It is generally performed after the application of the agent composition, but it is also possible to transfer the adhesive layer made of the 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, and the polymerization solvent and the like are dried and removed to form the pressure-sensitive adhesive layer on the polyester film. It can be manufactured by forming the above. After that, 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. Further, when the pressure-sensitive adhesive composition is applied onto a polyester film to form a pressure-sensitive adhesive layer, one or more solvents other than the polymerization solvent are added to the pressure-sensitive adhesive composition so that the pressure-sensitive adhesive layer can be uniformly applied onto the polyester film. You may add it newly.

  As a method for forming the pressure-sensitive adhesive layer, a known method used for manufacturing the pressure-sensitive adhesive layer is used. Specific examples include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, extrusion coating with a die coater, and the like.

  The pressure-sensitive adhesive layer preferably has a thickness of 3 to 100 μm, more preferably 5 to 50 μm. When the thickness of the pressure-sensitive adhesive layer is within this range, it is easy to obtain a suitable balance between removability and tackiness (adhesion), which is preferable.

<Separator>
The optical surface protection film of the present invention is characterized in that, for the purpose of protecting the pressure-sensitive adhesive layer surface, a release layer of a separator is attached to the pressure-sensitive adhesive layer surface to form an optical surface protection film with a separator. The separator includes a base material and a non-silicone release layer.

<Substrate>
Examples of the base material include paper and a plastic film, and a plastic film is preferably used because it has excellent surface smoothness. The plastic film is not particularly limited as long as it is a film capable of protecting 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 and the like can be mentioned.

  The thickness of the substrate is usually 5 to 200 μm, preferably 10 to 100 μm, more preferably 20 to 50 μm. It is preferable for it to be in this range because the workability of attaching to the pressure-sensitive adhesive layer and the workability of peeling from the pressure-sensitive adhesive layer are excellent.

  If necessary, the surface of the base material may be subjected to various surface treatments such as corona discharge treatment or various surface treatments such as embossing. Also, if necessary, fillers (inorganic fillers, organic fillers, etc.), antioxidants, antioxidants, ultraviolet absorbers, antistatic agents, lubricants, plasticizers, colorants (pigments, dyes, etc.), etc. Various additives may be mixed.

<Release layer>
The release layer is a release layer of a non-silicone material, which has adhesiveness to the base material, has releasability from the adhesive layer, and does not contain a silicone material (for example, a siloxane component). Formed from the agent composition.

<Release agent composition>
The release agent composition preferably contains a long-chain alkyl-based material and / or an aliphatic carboxylic acid ester. When the long-chain alkyl-based material and / or the aliphatic carboxylic acid ester is contained in the release agent composition, the releasability can be effectively obtained, and the coating layer formed from the release layer composition has unevenness. It is preferable in that a product having an appearance without whitening is obtained. The long-chain alkyl-based material and / or the aliphatic carboxylic acid ester may be used alone or in combination of two or more.

<Long-chain alkyl materials>
The long-chain alkyl material is a compound having a linear or branched alkyl group having 6 or more, preferably 8 or more, and more preferably 12 or more carbon atoms. Examples of the alkyl group include an octyl group, a decyl group, a lauryl group, an octadecyl group, and a 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, and long-chain alkyl group-containing quaternary ammonium salts. .. A polymer compound is preferable in consideration of heat resistance and stain resistance. Further, from the viewpoint that a suitable water repellency can be effectively obtained with a small content, a polymer compound having a long chain alkyl group in the side chain is more preferable.

  The polymer compound having a long-chain alkyl group in its side chain means 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, The polymer (ii) and the like 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. Examples of the reactive group include a hydroxyl group, an amino group, a carboxyl group, an acid anhydride and the like. Examples of compounds having these reactive groups include polyvinyl alcohol, butyral resin, ethylene-vinyl alcohol resin, polyethyleneimine, polyethyleneamine, reactive group-containing polyester resin, and reactive group-containing poly (meth) acrylic resin. Can be mentioned. Among these, (meth) acrylic polymers, polyvinyl alcohol, butyral resins, and ethylene vinyl alcohol resins are preferable in view of releasability and ease of handling.

<Alkyl group-containing (meth) acrylic polymer (i) having 6 or more carbon atoms>
A (meth) acrylic polymer obtained by polymerizing a monomer component containing an alkyl group-containing (meth) acrylic monomer having 6 or more carbon atoms is based on the total amount of monomer components constituting this (meth) acrylic polymer. It is preferable to contain the alkyl group-containing (meth) acrylic monomer having 6 or more carbon atoms in an amount of 10 to 80% by weight, more preferably 20 to 70% by weight, further preferably 30 to 70% by weight, and most preferably It is preferably 30 to 60% by weight. When it is within this range, the obtained release layer has excellent light releasability from the pressure-sensitive adhesive layer.

  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, and a cyano group. Group-containing monomers, vinyl ester monomers, aromatic vinyl monomers, amide group-containing monomers, imide group-containing monomers, amino group-containing monomers, epoxy group-containing monomers, N-acryloylmorpholine, vinyl ether monomers and the like can be appropriately used. These polymerizable monomers may be used alone or in combination of two or more.

  Above all, it is preferable to use a carboxyl group-containing (meth) acrylic monomer and a cyano group-containing monomer because they are excellent in light releasability of the optical surface protective film from the pressure-sensitive adhesive layer and in excellent adhesion of the separator to the substrate. Examples of the carboxyl group-containing (meth) acrylic monomer include (meth) acrylic acid, carboxylethyl (meth) acrylate, carboxylpentyl (meth) acrylate, 2- (meth) acryloyloxyethylhexahydrophthalic 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. Examples thereof include acrylonitrile and methacrylonitrile. Examples of the cyano group-containing monomer include acrylonitrile and methacrylonitrile.

<Polymer (ii) that 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>
Further, the compound having an alkyl group capable of reacting with the reactive group, for example, octyl isocyanate, decyl isocyanate, lauryl isocyanate, octadecyl isocyanate, long-chain alkyl group-containing isocyanate such as 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, and long-chain alkyl group-containing alcohols. Of these, long-chain alkyl group-containing isocyanates are preferable, and octadecyl isocyanate is particularly preferable, in consideration of releasability and ease of handling.

  The compound having an alkyl group capable of reacting with the reactive group is preferably reacted in 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, lauric acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, melissic acid, tetrariacontanoic acid. , Montanic acid, glutaric acid, adipic acid, azelaic acid and the like.

  On the other hand, examples of the alcohol include saturated or unsaturated monohydric alcohols and saturated or unsaturated polyhydric alcohols. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these alcohols, monohydric or polyhydric 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, the aliphatic alcohol also includes an alicyclic alcohol. 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 an aliphatic carboxylic acid and / or alcohol as impurities, and may be a mixture of a plurality of compounds.

  Specific examples of the aliphatic carboxylic acid ester, beeswax (mixture containing myricyl palmitate as a main component), stearyl stearate, behenyl behenate, octyldodecyl behenate, glycerin monopalmitate, glycerin monostearate, Examples thereof include glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate.

  The release agent composition contains the carboxylic acid ester in an amount of preferably 70 to 99% by weight, more preferably 80 to 99% by weight, and further preferably 90 to 99% by weight. It is preferable that the amount is in this range because it is excellent in light releasability from the adhesive layer.

  Further, the release agent composition may contain other known additives, for example, powders such as antistatic agents, colorants and pigments, surfactants, plasticizers, 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. Can be appropriately added depending on the intended use.

<Production of separator>
The separator is formed on the base material using the release agent composition.

  The method for forming the release layer on the base material is not particularly limited, but for example, a solution of the release agent composition is applied to the base material, and the release solvent is dried to remove the release layer on the base material. It is produced by forming. After that, curing may be performed for the purpose of adjusting the transfer of components in the release layer. Further, when the release agent composition is applied on the substrate to form a release layer, one or more kinds other than the polymerization solvent are added to the release agent composition so that the release layer can be uniformly applied on the substrate. A new solvent may be added.

  As the method for forming the release layer, a known method used for producing the release layer is used. Specific examples include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, extrusion coating with a die coater, and 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 peel off the separator, which may make it difficult to attach the optical surface protection film. On the other hand, if it is too thick, it may affect the stain resistance of the pressure-sensitive adhesive layer of the optical surface protection film.

<Lamination of optical surface protection film and separator>
The optical surface protective film with a separator of the present invention has a form in which the pressure-sensitive adhesive layer of the optical surface protective film and the release layer of the separator are bonded together. A known manufacturing method is used for the bonding.

  The thickness (total thickness) of the optical surface protection film with a separator is preferably 35 μm to 150 μm, more preferably 40 μm to 100 μm, and further preferably 43 μm to 85 μm.

<Measurement of shear adhesive strength of optical surface protection film to separator>
As shown in FIG. 2, the optical surface protective film with a separator 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 acrylic plate. 4 (length 70 mm, width 100 mm, thickness 1 mm). The upper part of the acrylic plate 4 is sandwiched by a chuck, and the separator 1 which is not fixed by the acrylic plate 4 is further cut, and the optical surface protection film 2 for the optical component not adhered to the separator 1 is sandwiched by the chuck and fixed, and the pulling speed The maximum value of the shearing force when pulled in the shearing direction at 0.06 m / min was defined as the shear adhesive force (N / 10 mm).

  The shear adhesion of the optical surface protection 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 protection film is less likely to be displaced, and the stress when the optical surface protection film with a separator is bent is less likely to be relaxed, so that the handling property does not deteriorate for the optical with a separator. A surface protective film can be obtained, which is preferable.

<Measurement of Separation Force of Separator from Optical Surface Protection Film>
In the optical surface protective film with a separator of the present invention, the optical surface protective film and the separator are laminated together, and after standing for 20 minutes at 23 ° C. and 50% RH, a peeling angle of 180 ° and a peeling speed of 0.3 m / min. By peeling the separator according to the conditions, the peeling force (N / 50 mm) of the separator with respect to the optical surface protection film can be obtained. The peeling force of the separator from the optical surface protection 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 has excellent releasability from the optical surface protective film, and further has excellent workability during bonding.

<Measurement of peeling force of optical surface protection film from glass>
In the optical surface protection film with a separator of the present invention, the pressure-sensitive adhesive layer of the optical surface protection film from which the separator has been peeled off is adhered to the surface of the glass plate with a 2 kg roller, and the condition is 23 ° C. and 50% RH. After 20 minutes, the peeling force (N / 25 mm) of the optical surface protective film to glass is obtained by peeling the optical surface protective film under the conditions of a peeling angle of 180 degrees and a pulling speed of 0.3 m / min. You can The peel strength of the optical surface protection film with respect to glass is preferably 0.08 N / 25 mm or less, more preferably 0.10 N / 25 mm or less, further preferably 0.08 N / 25 mm or less, and 0.06 N / 25 mm. The following is more preferable, and 0.04 N / 25 mm or less is most preferable. Further, it is preferably 0.01 N / 25 mm or more. Within this range, the pressure-sensitive adhesive layer has excellent peelability from the adherend of glass.

  Hereinafter, examples and the like specifically showing the configuration and effects of the present invention will be described, but the present invention is not limited thereto. The evaluation items in Examples and the like were measured as follows.

<Example 1>
<Preparation of (meth) acrylic polymer>
In a four flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser, 100 parts by weight of 2-ethylhexyl acrylate (2EHA, manufactured by Toagosei), 2-hydroxyethylacrylate (HEA, manufactured by Toagosei, Aclicks). 4 parts by weight of HEA, 0.2 parts by weight of 2,2′-azobisisobutyronitrile (Wako Pure Chemical Industries, AIBN) as a polymerization initiator, 205 parts by weight of ethyl acetate (Showa Denko, ethyl acetate) Then, nitrogen gas was introduced while gently stirring, the liquid temperature in the flask was kept at about 63 ° C., and the polymerization reaction was carried out for about 4 hours to prepare a (meth) acrylic polymer solution (about 35 wt%). The (meth) acrylic polymer had a weight average molecular weight (Mw) of 650,000 and a Tg of -68.3 ° C.

<Preparation of acrylic adhesive composition>
The (meth) acrylic polymer solution (about 35% by weight) was diluted to 29% by weight with ethyl acetate, and 100 parts by weight (solid content) of the (meth) acrylic polymer of this solution was added to the isocyanate of hexamethylene diisocyanate. 4 parts by weight of nurate (Coronate HX manufactured by Nippon Polyurethane Industry Co., Ltd.), 0.015 parts by weight of dioctyl tin laurate (manufactured by Tokyo Fine Chemicals, Enbilizer OL-1) as a tin-based catalyst, and 3 parts by weight of acetylacetone as a crosslinking retarder. In addition, keeping the temperature at around 25 ° C. and mixing and stirring for about 1 minute, an acrylic pressure-sensitive adhesive composition was prepared.

<Separator having a non-silicone release layer>
As a separator having a non-silicone release layer, DIAFOIL T100H25 [UH18] (thickness 25 μm) manufactured by Mitsubishi resin was used. This substrate was a polyester film, and this release layer was formed by a release agent composition containing pentaerythritol fatty acid ester and octadecyl isocyanate.

<Preparation of optical surface protection film with separator>
The acrylic adhesive composition was applied to one surface of a polyester film (manufactured by Mitsubishi Plastics, DIAFOIL T100C38, thickness 38 μm) and heated at 130 ° C. for 60 seconds to form an adhesive layer having a thickness of 10 μm. 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 protection film with a separator.

<Examples 2 to 6>
As shown in Table 1, Examples 2 to 6 were performed in the same manner as in Example 1 except that the monomer components constituting the (meth) acrylic polymer, various additives, and the thickness of the pressure-sensitive adhesive layer were changed. An optical surface protective film with a separator was prepared. The acrylic polymer of Example 3 had a weight average molecular weight (Mw) of 580,000 and a Tg of -67.6 ° C. The acrylic polymer of Example 4 had a weight average molecular weight of 610,000 and a Tg of -50.3 ° C. As an iron-based catalyst, tris (acetylacetonato) iron (manufactured by Nippon Kagaku Sangyo Co., Ltd., trade name " Ferric acid), tetrad C (manufactured by Mitsubishi Gas Chemical Co., Inc.) as the epoxy-based cross-linking agent, and Aqualon HS-10 (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) as the surfactant.

<Example 7>
<Preparation of urethane-based adhesive composition>
As a polyol, Preminol S3011 (manufactured by Asahi Glass Co., Ltd., Mn = 10000, triol): 85 parts by weight, Sannix GP3000 (manufactured by Sanyo Chemical Industry, Mn = 3000, triol): 13 parts by weight, Sannix GP1000 (manufactured by Sanyo Chemical Industry) , Mn = 1000, triol) 2 parts by weight, and as a polyfunctional isocyanate compound, a polyfunctional alicyclic isocyanate compound, Coronate HX (Japan Polyurethane Industry Co., Ltd.): 18 parts by weight, catalyst (manufactured by Nippon Kagaku Sangyo Co., Ltd.) , Trade name: ferric iron Nasem): 0.08 part by weight, Irganox 1010 (manufactured by BASF) as a deterioration inhibitor: 0.5 part by weight, isopropyl myristate as an aliphatic carboxylic acid ester (manufactured by Kao, trade name: Exepearl IPM) ): 30 parts by weight, as a diluting solvent Ethyl: by blending 210 parts by weight, and stirred with a disper, to obtain a urethane-based pressure-sensitive adhesive composition.

  An optical surface protective film with a separator of Example 7 was produced in the same manner as in Example 1 using the urethane pressure-sensitive adhesive composition.

<Comparative Examples 1 to 3>
<Separator having a silicone-based release layer>
100 parts by weight of a silicone release agent (KS-847H manufactured by Shin-Etsu Chemical Co., Ltd.), 3.3 parts by weight of a silicone curing catalyst (CAT-PL-50T manufactured by Shin-Etsu Chemical Co., Ltd.) were added, and toluene (manufactured by Idemitsu Petrochemical) was added. Hexane (manufactured by Maruzen Petrochemical, normal hexane) and methyl ethyl ketone (manufactured by Idemitsu Kosan, MEK) were diluted to 0.3% by weight with a mixed solvent having a weight ratio of 1: 2: 1 to obtain a release agent composition. .. This release agent composition is applied to a 38 μm-thick polyester film (Mitsubishi foil, Diafoil T100-25) and dried at 130 ° C. for 1 minute to have a silicone-based release layer for Comparative Examples 1 to 3. A separator was produced. 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, optical surface protective films with separators of Comparative Examples 1 to 3 were 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 release layer, a separator-equipped optical surface protection film of Comparative Example 4 was produced in the same manner as in Example 1. As the cross-linking agent (B), Coronate L (a trimer addition product of tolylene diisocyanate and trimethylol propane, manufactured by Nippon Polyurethane Industry Co., Ltd.) was used.

  The specific measurement / 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.

Equipment: Tosoh Corp., HLC-8220GPC
Sample column: Tosoh Corp., TSKguardcolumn Super HZ-H (1) + TSKgel Super HZM-H (2)
Reference column; Tosoh Corp., 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 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)]
(In the formula, 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
As a reference value, “Synthesis and design of acrylic resin and development of new applications” (published by the Central Management Development Center Publishing Division) was referred to.

<Measurement of shear adhesive strength of optical surface protection film to separator>
As shown in FIG. 2, the obtained optical surface protective film with a separator was cut into 10 mm × 50 mm, and a double-sided tape was attached to the separator side of the 10 mm × 10 mm portion of the acrylic plate (length 70 mm, width 100 mm). , Thickness 1 mm). The top of the acrylic plate is sandwiched by a chuck, and the separator that is not fixed by the acrylic plate is cut, and the optical surface protection film for which the separator is not stuck is sandwiched by the chuck and fixed, and the pulling speed is 0.06 m / min. Then, the maximum value of the shearing force when pulled in the shearing direction was defined as the shearing adhesive force (N / 10 mm) of the optical surface protection film to the separator.

<Evaluation of handleability of optical surface protection film with separator>
The obtained optical surface protection film with a separator was cut into 15 cm × 25 cm, and the optical surface protection film side was wound inside to form a tube having a diameter of about 2 cm, and then immediately released. After release, the optical surface protective film with a separator that returned to the sheet shape was evaluated as good (◯), and the one that was deformed and did not return to the sheet shape was evaluated as bad (x).

<Measurement of Separation Force of Separator from Optical Surface Protection Film>
The obtained optical surface protection film with a separator was cut into a width of 50 mm, and the surface (polyester film) opposite to the surface on 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 degrees at a speed of 0.3 m / min, and the separator has a peeling force (N / 50 mm) from the optical surface protection film. Was measured.

<Evaluation of separator releasability>
The separator releasability was evaluated as good (∘) when the separation force of the separator with respect to the optical surface protection film was 0.3 N / 50 mm or less, and as bad (x) when it was more than 0.3 N / 50 mm.

<Measurement of peeling force of optical surface protection film from glass>
The obtained optical surface protection film with a separator was cut into a width of 25 mm, the separator was peeled off, and the glass plate (Matsunami glass, soda edging product, OF1) was attached to the glass plate with a 2 kg roller, and the temperature was 23 ° C. It was left for about 20 minutes in an environment with relative humidity of 50%. Then, the optical surface protection film was peeled off at an angle of 180 degrees at a speed of 0.3 m / min, and the peeling force (N / 25 mm) of the optical surface protection film from glass was measured.

  From the results of Table 1 above, since the shear adhesive strength of the optical surface protection film obtained in Examples 1 to 7 to the separator is 15 N / 10 mm or more, the optical surface protection film with a separator is suitable for external force. It was confirmed that it was not easily deformed and was excellent in handleability. Further, since the peeling force of the separator with respect to the optical surface protective film is 0.3 N / 50 mm or less, it was confirmed that the optical surface protective film with a separator has excellent releasability from the pressure-sensitive adhesive layer of the separator. ..

  On the other hand, since the shear adhesive force to the separator of the optical surface protection film obtained in Comparative Examples 1 to 3 is less than 15 N / 10 mm, the optical surface protection film with a separator is the same as that of the example. By comparison, it was confirmed that they were easily deformed by external force and were inferior in handleability. Furthermore, since the peeling force of the separator obtained in Comparative Example 4 to the optical surface protective film is larger than 0.3 N / 50 mm, the optical surface protective film with a separator is compared with that of the example, and the separator It was confirmed that the releasability from the adhesive layer was poor.

1: Separator 2: Optical surface protective film 3: Optical surface protective film with separator 4: Acrylic plate 11: Base material 12: Release layer 21: Adhesive layer 22: Polyester film

Claims (5)

An optical surface protective film having an adhesive layer on at least one side of a polyester film, and a separator on the side opposite to the polyester film of the adhesive layer, an optical surface protective film with a separator,
The pressure-sensitive adhesive layer is formed from an acrylic pressure-sensitive adhesive composition containing a (meth) acrylic polymer (A) and a crosslinking agent (B), and / or a urethane pressure-sensitive adhesive composition,
The separator has a substrate, and a non-silicone release layer,
Shear adhesion of the optical surface protection film to the separator is 15 N / 10 mm or more at a pulling speed of 0.06 m / min, and
The peeling force of the separator with respect to the optical surface protective film is 0.3 N / 50 mm or less at a peeling angle of 180 ° and a peeling speed of 0.3 m / min, wherein the optical surface protective film with a separator is used. The (meth) acrylic polymer (A) contains, as a monomer component, an alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms and a functional group-containing (meth) acrylic monomer,
2 to 20 parts by weight of the functional group-containing (meth) acrylic monomer is contained with respect to 100 parts by weight of the alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms. An optical surface protective film with a separator as described above.   The said crosslinking agent (B) is a polyfunctional isocyanate type compound and / or a polyfunctional epoxy type compound, The optical surface protection film with a separator of Claim 1 or 2 characterized by the above-mentioned.   The polyfunctional isocyanate compound and / or the polyfunctional epoxy compound is contained in an amount of 2 to 25 parts by weight based on 100 parts by weight of the (meth) acrylic polymer (A). Optical surface protection film with separator. The urethane-based pressure-sensitive adhesive composition contains a polyol, a polyfunctional isocyanate-based compound, a catalyst, and a deterioration inhibitor,
The catalyst is an iron-based compound, and / or a tin-based compound,
The equivalence ratio (NCO / OH) of the isocyanate group of the polyfunctional isocyanate-based compound and the hydroxyl group of the polyol is 1 to 5, and the optical element with a separator according to claim 1. Surface protection film.

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