JP2019194337A - Surface protective film for optical purpose having separator - Google Patents

Abstract

To provide a surface protective film for an optical purpose having a separator, in which the surface protective film for an optical purpose having a separator is not prone to deform by an external force, even when a total thickness of the surface protective film for an optical purpose having a separator becomes thin, without contaminating a surface of an optical member with a silicone-based material.SOLUTION: A surface protective film 3 for an optical purpose having a separator includes an adhesive layer 21 composed of an acrylic pressure sensitive adhesive composition containing a (meth)acrylic polymer (A) and a crosslinking agent (B) and/or an urethane-based adhesive composition. The separator 1 includes a base material 11 and a non-silicone based release layer 12. A surface protective film 2 for an optical purpose has a shear adhesive force 15 N/10 mm or more to the separator at a tensile rate 0.06 m/min. The separator has a peel force 0.3 N/50 mm or more to the surface protective film for an optical purpose at a peel angle 180 degree and a peel rate 0.3 m/min.SELECTED DRAWING: Figure 1

Description

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

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

  In general, an optical surface protection film is attached to an optical member, an electronic member, or the like in order to prevent the exposed surface from being damaged during processing, assembly, inspection, transportation, and the like. The optical surface protective film is composed of a base film and an adhesive layer, and if necessary, a separator (release film, or on the surface of the adhesive layer for the purpose of protecting the adhesive layer before sticking (use). (Also referred to as a release liner) is bonded together 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 attached optical surface protective film is peeled off from the optical member when it is no longer needed, and further provided with a layer (other layer) having other functions on the surface of the peeled optical member. There are cases (Patent Document 2).

JP2012-224811 JP2014-208756

  However, depending on the state of the surface of the optical member (adhered body) after the optical surface protective film is peeled off, the other layer may be an optical member due to poor wettability or adhesion to other layers. There is a problem that the product peels off 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 material (for example, a siloxane component), the silicone material of the release layer is transferred to the adhesive layer of the surface protection film. For this reason, the above problem becomes significant when the surface of the optical member (adhered body) after the optical surface protective film is peeled is contaminated with the silicone material.

  On the other hand, the total thickness of the optical surface protective film with a separator tends to be thin due to demand for cost reduction and thinning. However, when the total thickness is reduced, 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 lowered (for example, an optical surface protective film with a separator is removed). Once wound in a cylindrical shape, there is a problem that it will be deformed into a curled shape and cannot be restored.

  In the optical surface protective film with a separator, the surface of the optical member (adhered body) is not contaminated with a silicone material, and the total thickness of the optical surface protective film with a separator is reduced. Another object of the present invention is to provide an optical surface protective film with a separator that is difficult 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 the optical surface protective film with a separator, the shear adhesive force (shearing force) of the pressure-sensitive adhesive layer of the optical surface protective film to the release layer of the separator. ) Higher than a certain value makes it difficult for deviation 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). Even in this case, as a result of the stress not being relieved, even when the total thickness of the optical surface protective film with a separator is reduced, it is found that the handling property can be prevented from being lowered due to the deformation of the optical surface protective film with a separator, In addition, by making the peeling force of the separator with respect to the optical surface protective film constant or less, the optical surface protective film 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 protective film with a separator having an optical surface protective film having an adhesive layer on at least one surface of a polyester film, and a separator on the opposite surface of the adhesive layer from the polyester film. The separator has a base material and a non-silicone release layer, and the shear adhesive force of the optical surface protective film to the separator is 15 N / 10 mm or more at a tensile speed of 0.06 m / min. Further, the optical surface protection with a separator is characterized in that the separation force of the separator with respect 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. Film.

  In the optical surface protective film with a separator of the present invention, the non-silicone release layer is preferably formed from a release agent composition containing a long-chain alkyl 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 -Based 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, the alkyl group containing 2 to 14 carbon atoms. 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 cross-linking 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 is 2 to 25 weights 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 from a urethane-based pressure-sensitive adhesive composition.

  In the optical surface protective film with a separator of the present invention, the urethane pressure-sensitive 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 preferable that the equivalent ratio (NCO / OH) of the isocyanate group of the polyfunctional isocyanate compound and the hydroxyl group of the polyol is 1 to 5.

  In the optical surface protective film with a separator of the present invention, after the adhesive layer of the optical surface protective film is applied to an optical member (adhered body), the surface of the adherend is contaminated with a silicone material by the adhesive layer. In addition, since the optical surface protective film with a separator is not easily deformed by an external force, the handling property of the optical surface protective film with a separator is not deteriorated, and in addition, the separator is excellent in peelability from the optical surface protective film. Because it is useful.

It is a typical sectional view showing an example of 1 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 protective film with separator>
A typical configuration example of the optical surface protective film with a separator of the present invention is schematically shown in FIG. This optical surface protective film 3 with a separator is a form in which a separator 1 and an optical surface protective film 2 are laminated. The separator 1 includes a substrate 11 and a release layer 12, the optical surface protective film 2 includes a polyester film 22, and an adhesive layer 21 provided on one surface thereof, and the lamination is performed with the release layer 12 and the adhesive layer. The agent layer 21 is bonded together. After the separator 1 is peeled off, the optical surface protective film 3 with a separator is an optical member (an object to be protected, for example, glass used for a liquid crystal display, a polarizing plate, a wave plate, a retardation, etc.). A plate, an optical compensation film, a reflection sheet, a brightness enhancement film, a surface of an optical component such as a transparent conductive film, and the like, and is used by being peeled off from the optical member when it becomes unnecessary. Further, the optical surface protective film 3 with a separator has a pressure-sensitive adhesive layer 2 on both sides of the polyester film 22, or has an antistatic layer on the opposite side of the surface of the polyester film 22 to which the pressure-sensitive adhesive layer 2 is attached. Is mentioned.

<Optical surface protective film>
The optical surface protective film of the present invention comprises a polyester film and an adhesive layer.

  The optical surface protective film of the present invention is an optical component (for example, glass, polarizing plate, wave plate, retardation plate, optical compensation film, reflection sheet, brightness enhancement film, transparent conductive film, etc. used for liquid crystal displays) Optical surface protective film that protects the surface of optical components during processing and transport of optical components), and is generally referred to as an optical adhesive sheet, optical adhesive tape, optical adhesive label, optical adhesive film, etc. It is a thing of the 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 in a regular or random pattern such as a dot or stripe. It may be a pressure-sensitive adhesive layer. The optical surface protective film may be in the form of a roll or a single wafer.

<Polyester film>
The polyester film of the present invention includes 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 is excellent in optical properties and dimensional stability.

  Various additives such as antioxidants, ultraviolet absorbers, plasticizers, colorants (pigments, dyes, etc.) may be blended in the resin material constituting the polyester film, if necessary. The first surface of the polyester film may be subjected to known or common surface treatments such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and application of a primer. Such a surface treatment can be, for example, a treatment for improving the adhesion between the polyester film and the pressure-sensitive adhesive layer (the anchoring property of the pressure-sensitive adhesive layer). Surface treatment in which polar groups such as hydroxyl groups are introduced on the surface of the polyester film can be preferably employed. Moreover, the surface treatment similar to a 1st surface may be given to the 2nd surface of the said polyester film, and an adhesive layer and an antistatic layer may be provided.

  The optical surface protective film of the present invention can be provided with an antistatic function by providing the antistatic layer on the surface opposite to the surface of the polyester film to which the pressure-sensitive adhesive layer is attached. Moreover, you may use the polyester film by which antistatic treatment was made beforehand. It is preferable to use the polyester film because charging is suppressed when the separator is peeled off or when the pressure-sensitive adhesive layer is peeled off from the optical member as an adherend. In addition, there is no restriction | limiting in particular as a method to provide an antistatic function, A conventionally well-known method can be used, for example, antistatic resin which consists of an antistatic agent and a resin component, a conductive polymer, and a conductive substance. Examples thereof include a method of applying a conductive resin, a method of depositing or plating a conductive material, 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, it is preferable because the workability of bonding to an optical member as an adherend and the workability of peeling from the optical member are excellent.

<Adhesive layer>
The pressure-sensitive adhesive layer of the present invention can be used without particular limitation as long as it has adhesiveness, but is a pressure-sensitive adhesive layer formed from a pressure-sensitive adhesive composition that does not contain a silicone-based 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, among others, transparency and heat resistance. From the viewpoint of removability (releasing 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 refers to an acrylic polymer and / or a methacrylic polymer.

<(Meth) acrylic polymer (A)>
Although the said (meth) acrylic-type polymer (A) will not be specifically limited if it is a (meth) acrylic-type polymer which has adhesiveness, As a monomer component, a C2-C14 alkyl group containing (meth) acrylic-type monomer Is preferably used. 1 type (s) 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 monomer>
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) ) Acrylates, isodecyl (meth) acrylates, n-dodecyl (meth) acrylates, n-tridecyl (meth) acrylates, n-tetradecyl (meth) acrylates and other alkyl group-containing (meth) acrylic monomers such as It is mentioned as a suitable thing. 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 the adherend to be low, and the pressure-sensitive adhesive layer is excellent in removability.

  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 in this range, the pressure-sensitive adhesive composition has an 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 (meth) acrylic monomer of a carboxyl group-containing (meth) acrylic monomer.

<Hydroxyl group-containing (meth) acrylic monomer>
By using the hydroxyl group-containing (meth) acrylic monomer, it is possible to easily control the crosslinking of the hydroxyl group, thereby improving the wettability by flow and the balance between the cohesive force and shear adhesive force of the pressure-sensitive adhesive layer. 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 that can generally act as a crosslinking site, a hydroxyl group has an appropriate interaction with an ionic compound that is an antistatic agent. Therefore, it can be suitably used in terms of antistatic properties.

  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 monomer 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 further prevent the adhesive force from increasing with time, re-peelability, adhesive force increase preventing property, and workability. Excellent pressure-sensitive adhesive layer. In particular, by improving the shear adhesive force 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 ( The occurrence of slippage and deviation 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) acryloyloxyethyl hexahydrophthalic acid, 2 -(Meth) acryloyloxypropylhexahydrophthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyloxyethyl maleic acid, carboxy Examples 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, more preferably 2 to 100 parts by weight of an alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms. -15 parts by weight, more preferably 4-12 parts by weight. Within this range, the balance between the wettability of the pressure-sensitive adhesive composition and the cohesive force and shear pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer can be easily controlled, and the re-peelability and the anti-adhesive strength prevention property are excellent.

<Other polymerizable monomers>
In the (meth) acrylic polymer (A), other polymerizable monomers can be used as a monomer component without particular limitation as long as they do not impair the characteristics of the present invention. For other polymerizable monomers, the Tg of the (meth) acrylic polymer (A) is −50 ° C. or lower and −100 ° C. or higher, particularly for the reason that it is easy to balance the adhesive performance. It can be used to adjust the peelability.

  Examples of the other polymerizable monomers include, for example, cyano group-containing monomers, vinyl ester monomers, aromatic vinyl monomers and other cohesive force / heat resistance improving components, amide group-containing monomers, imide group-containing monomers, amino group-containing monomers, A component having a functional group that works as an adhesive (adhesive) power improvement or crosslinking base point, such as an epoxy group-containing monomer, N-acryloylmorpholine, or a vinyl ether monomer, can be used as appropriate. 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, chloromethyl styrene, α-methyl styrene, other substituted styrenes, and the like.

  Examples of the amide group-containing monomer include acrylamide, methacrylamide, diethylacrylamide, N-vinylpyrrolidone, N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, N, N-diethylacrylamide, and N, N-diethyl. Examples include methacrylamide, N, N′-methylenebisacrylamide, N, N-dimethylaminopropyl acrylamide, N, N-dimethylaminopropyl methacrylamide, diacetone acrylamide, and the like.

  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, methyl glycidyl (meth) acrylate, and allyl glycidyl ether.

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

  The other polymerizable monomer is preferably 0.01 to 10% by weight, and 0.05 to 5% by weight with respect to the total amount of monomer components constituting the (meth) acrylic polymer (A). It is more preferable. By using the other polymerizable monomer within this range, for example, when using an ionic compound of an antistatic agent, appropriately adjust a good interaction with this compound and a good removability. Can do.

  The (meth) acrylic polymer (A) preferably has a weight average molecular weight (Mw) of 100,000 to 5,000,000, more preferably 200,000 to 4,000,000, still more preferably 300,000 to 3,000,000. When the weight average molecular weight is smaller than 100,000, the adhesive force tends to be generated due to a decrease in the cohesive force of the pressure-sensitive adhesive composition. On the other hand, when the weight average molecular weight (Mw) exceeds 5,000,000, the fluidity of the polymer is lowered, and the wettability to the adherend (for example, a polarizing plate as an optical member) becomes insufficient, and the adherend adheres to the adherend. There is a tendency to cause blisters occurring between the agent layer and 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 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 difficult to flow. For example, the adherend (eg, a polarizing plate which is an optical member) is insufficiently wetted, and the adherend and the adhesive layer There is a tendency to cause blisters that occur in between. In particular, by setting the glass transition temperature to −61 ° C. or lower, it becomes easy to obtain a pressure-sensitive adhesive composition excellent in wettability to the adherend and light peelability. In addition, the glass transition temperature of the said (meth) acrylic-type polymer (A) can be adjusted in the said range by changing suitably the monomer component and composition ratio to be used.

  The polymerization method of the (meth) acrylic polymer (A) is not particularly limited, and 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 the adherend, solution polymerization is a more preferable embodiment. Moreover, the polymer 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), isocyanate compounds, epoxy compounds, melamine resins, aziridine derivatives, metal chelate compounds and the like may be used, and the use of isocyanate compounds and / or epoxy compounds is particularly preferable. It becomes an aspect. Moreover, these compounds may be used independently and may be used in mixture of 2 or more types.

<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, and hydrogenated tolylene diene. Isocyanate hydrogenated tetramethylxylylene diisocyanate and the like.

  Examples of the aromatic polyisocyanate include phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,2′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, 4 4,4'-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 compound include the above-described diisocyanate multimers (dimers, trimers, pentamers, etc.), urethane-modified products reacted with polyhydric alcohols such as trimethylolpropane, and urea-modified compounds. Body, biuret modified body, alphanate modified body, isocyanurate modified body, carbodiimide modified body and the like.

  Examples of commercially available products of the polyfunctional isocyanate compound include, for example, trade names “Millionate MT” “Millionate MTL” “Millionate MR-200” “Millionate MR-400” “Coronate L” “Coronate HL” “Coronate HX” Product 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 "[manufactured by Mitsui Chemicals, Inc.]; 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. Aliphatic polyisocyanates and their modified products have more flexible cross-linking structures than other isocyanate-based cross-linking agents, easily relieve stress associated with the expansion / contraction of optical films, and may cause peeling in durability tests. Hard to do. As the aliphatic polyisocyanate and its modification, hexamethylene diisocyanate and its modification are particularly preferable.

<Polyfunctional epoxy compound>
As the epoxy compound, a polyfunctional epoxy compound having at least two epoxy groups in one molecule can be used. Examples of the polyfunctional epoxy compound include N, N, N ′, N′-tetraglycidyl-m-xylenediamine, diglycidylaniline, 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 Diethyl ether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, triglycidyl-tris (2-hydroxyethyl) isocyanurate, resorcin diglycidyl ether, bisphenol-S-diglycidyl ether, and epoxy group in the molecule And an epoxy resin having two or more. Furthermore, commercial items, such as a brand name "Tetrad C" (made by Mitsubishi Gas Chemical Co., Ltd.), are also mentioned.

  The content of the polyfunctional isocyanate-based compound and / or epoxy-based compound is based on 100 parts by weight of the (meth) acrylic polymer (A) from the viewpoint of removability and low contamination 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 can further contain a catalyst (C) in order to make the reaction proceed more effectively. Examples of the catalyst (C) include tin catalysts such as dibutyltin dilaurate and dioctyltin dilaurate, tris (acetylacetonate) iron, tris (hexane-2,4-dionato) iron, and 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 (tridecan-6,8-dionato) iron, tris (1-phenylbutane-1,3- Onato) Iron, Tris (hexafluoroacetylacetonato) iron, Tris (ethyl acetoacetate) iron, Tris (acetoacetate-n-propyl) iron, Tris (isopropyl acetoacetate) iron, Tris (acetoacetate-n-butyl) Iron, tris (acetoacetate-sec-butyl) iron, tris (acetoacetate-tert-butyl) iron, tris (methyl propionylacetate) iron, tris (ethyl propionylacetate) iron, tris (propionylacetate-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, tris Iron-based catalysts such as reethoxy iron, triisopropoxy iron, and ferric chloride can be used. One type of catalyst (C) may be used, or two or more types may be used in combination.

Further, as the iron-based catalyst, an iron chelate compound can be suitably used, and for example, it can be expressed as a general formula Fe (X) (Y) (Z). The iron chelate compound is composed of Fe (X) 3, Fe (X) 2 (Y), Fe (X) (Y) 2, Fe (X) (Y) (Z) by the combination of (X) (Y) (Z). ). Iron chelate compound Fe (X) (Y)
In (Z), (X) (Y) (Z) is a ligand for Fe. For example, when X, Y, or Z is a β-diketone, 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- Examples include 6,8-dione, 1-phenyl-butane-1,3-dione, hexafluoroacetylacetone, and ascorbic acid.

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

  Further, an iron-based catalyst other than the iron chelate compound can be used. For example, a compound of iron and an alkoxy group, a halogen atom, or an acyloxy group can be used. In the case of a compound of iron and an alkoxy group, as an alkoxy group, methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, sec-butoxy group, tert-butoxy group, pentyloxy group, hexyloxy 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 acyloxy group, as the acyloxy group, 2-ethylhexylic acid, octylic acid, naphthenic acid, resin acid (abietic acid, neoabietic acid, d-pimaric acid, iso-d-pimalic acid, podocarpic acid) , Gluconic acid, fumaric acid, citric acid, aspartic acid, α-ketoglutamic acid, malic acid, succinic acid, aliphatic organic acids such as glycine and histidine, benzoic acid, cinnamic acid, p -Aromatic fatty acids mainly composed of oxycinnamic acid and the like.

  Among the iron-based catalysts, an iron chelate compound having a β-diketone as a ligand is preferable in terms of reactivity and curability, and tris (acetylacetonate) iron is particularly preferable.

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

<Crosslinking retarder>
Further, the acrylic pressure-sensitive adhesive composition can contain a compound that causes keto-enol tautomerism as a crosslinking retarder. For example, in a pressure-sensitive adhesive composition containing a polyfunctional isocyanate compound or a pressure-sensitive adhesive composition that can be used by blending a polyfunctional isocyanate compound, an embodiment including a compound that produces the keto-enol tautomerism is preferably adopted. Can do. Thereby, the excessive viscosity rise and gelation of the adhesive composition after the blending of the polyfunctional isocyanate compound can be suppressed, and the effect of extending the pot life of the adhesive composition can be realized. This technique can be preferably applied, for example, when the pressure-sensitive adhesive composition is in an organic solvent solution or a solvent-free form.

  Various β-dicarbonyl compounds can be used as the compound that causes keto-enol tautomerism. 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; acetoacetates 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 isobutylyl acetate; malonates such as methyl malonate and ethyl malonate; etc. And the like. Among these, acetylacetone and acetoacetic acid esters are preferable compounds. Compounds that produce keto-enol tautomerism may be used alone or in combinations of two or more.

  The content of the compound that causes 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). 5 to 15 parts by weight (for example, 1 to 10 parts by weight) is appropriate. If the amount of the compound is too small, it may be difficult to achieve 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 cohesive force.

<Surfactant>
The acrylic pressure-sensitive adhesive composition may contain a surfactant from the viewpoint of removability and improvement in wettability of the pressure-sensitive adhesive composition to the adherend. Examples of the surfactant include known anionic surfactants, nonionic surfactants, and cationic surfactants. 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 naphthalene sulfonate formalin condensate, sodium alkylbenzene sulfonate, sodium alkyl dodecyl sulfate, ammonium alkyl sulfate, alkyl sulfate triethanolamine, dialkyl sulfosuccinic acid Examples include sodium, sodium alkyldiphenyl ether disulfonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkylphenyl ether sulfate, ammonium polyoxyethylene alkylpropenyl phenyl ether sulfate.

  Examples of the nonionic surfactant include 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, Polyoxyethylene alkylamines, alkyl alkanolamides, polyetherated compositions of acetylenic dialcohols, and the like.

  Examples of the cationic surfactant include alkyltrimethylammonium chloride.

  Content of the said surfactant can be 0.01-10 weight part with respect to 100 weight part of said (meth) acrylic-type polymers (A), Usually, 0.1-1 weight part and It is appropriate to do.

  Furthermore, the acrylic pressure-sensitive adhesive composition may contain other known additives, such as powders of colorants, pigments, plasticizers, antistatic agents, tackifiers, low molecular weights, and the like. 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 added as appropriate according to the intended use.

<Urethane-based 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.

  Any appropriate polyol can be adopted as the polyol as long as it has two or more hydroxyl groups. Examples of such a polyol include a polyol having 2 hydroxyl groups (diol), a polyol having 3 hydroxyl groups (triol), a polyol having 4 hydroxyl groups (tetraol), and a polyol having 5 hydroxyl groups. (Pentaol), 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 includes a polyol having a number average molecular weight (Mn) of 400 to 20000. The content ratio of the polyol having a number average molecular weight (Mn) of 400 to 20000 in the total amount of polyol is preferably 50 to 100% by weight, more preferably 70 to 100% by weight, and still more preferably 90 to 90%. 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 20000 in the polyol within the above range, for example, a urethane-based pressure-sensitive 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, and castor oil-based polyol.

  As said polyester polyol, it can obtain by esterification reaction of a polyol component and an acid component, for example.

  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- Examples include methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, and polypropylene glycol.

  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 , 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′-biphenyl dicarboxylic acid Examples thereof include acids and acid anhydrides thereof.

  Examples of the polyether polyol include water, low-molecular polyol (propylene glycol, ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, etc.), bisphenols (bisphenol A, etc.), dihydroxybenzene (catechol, resorcin, hydroquinone, etc.). And the like, and polyether polyols obtained by addition polymerization of 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.

  Examples of the polycarbonate polyol include a polycarbonate polyol obtained by polycondensation reaction of the polyol component and phosgene; the polyol component, dimethyl carbonate, diethyl carbonate, diprovir carbonate, diisopropyl carbonate, dibutyl carbonate, ethylbutyl carbonate, ethylene carbonate. Polycarbonate polyol obtained by ester exchange condensation with carbonic acid diesters such as propylene carbonate, diphenyl carbonate and dibenzyl carbonate; copolymer polycarbonate polyol obtained by using two or more of the above polyol components together; various polycarbonate polyols and carboxyl groups Polycarbonate polyol obtained by esterification reaction with a containing compound; the above-mentioned various polycarbonate polyols and a hydroxyl group-containing compound Polycarbonate polyol obtained by etherification reaction of polycarbonate; polycarbonate polyol obtained by transesterification of the above-mentioned various polycarbonate polyols and ester compounds; polycarbonate polyol obtained by transesterification of the above-mentioned various polycarbonate polyols with hydroxyl group-containing compounds Polyester polyester polyols obtained by polycondensation reaction of the various polycarbonate polyols and dicarboxylic acid compounds; copolymer polyether polycarbonate polyols obtained by copolymerizing the various polycarbonate polyols and alkylene oxides; .

  Examples of the castor oil-based polyol include castor oil-based polyol 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 viewpoint of removability and wettability of the pressure-sensitive adhesive composition to the 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 aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanate compounds, and the like. Specifically, the polyfunctional isocyanate compounds include those exemplified in the crosslinking agent (B). A functional isocyanate type compound group is mentioned. Of these, aliphatic polyisocyanates and modified products thereof are preferred. Aliphatic polyisocyanates and their modified products have more flexible cross-linking structures than other isocyanate-based cross-linking agents, easily relieve stress associated with the expansion / contraction of optical films, and may cause peeling in durability tests. Hard to do. As the aliphatic polyisocyanate and its modified product, hexamethylene diisocyanate and its modified product are particularly preferable.

  From the viewpoints of removability and wettability of the pressure-sensitive adhesive composition to the adherend, 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 to 5, more preferably 1.1 to 3, and still more preferably 1.2 to 2.

  The urethane-based pressure-sensitive adhesive composition preferably contains an iron-based compound and / or a tin-based compound catalyst. Specifically, the iron-type compound and the tin-type compound which were illustrated with the catalyst (C) of the acrylic adhesive composition mentioned above are 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 preferred is 0.01 to 0.1 part by weight. Within this range, when the pressure-sensitive adhesive layer is formed, the speed of the cross-linking reaction is high, and the pot life of the pressure-sensitive adhesive composition is increased, which is a preferred embodiment.

  The urethane pressure-sensitive adhesive composition preferably contains a deterioration inhibitor such as an antioxidant, an ultraviolet absorber, and a light stabilizer. By including an anti-degradation agent in the urethane-based pressure-sensitive adhesive composition, the adhesive residue is less likely to remain on the adherend even if it is stored in a heated state after being attached to the adherend. Can be.

  Examples of the deterioration inhibitor include a deterioration inhibitor containing a compound having a hindered phenol structure. Only one type of deterioration preventing agent may be used, or two or more types may be used.

  Examples of the deterioration inhibitor containing a compound having a hindered phenol structure include, for example, a large steric hindrance such as a tertiary butyl group on at least one of adjacent carbon atoms on the aromatic ring to which the OH group of phenol is bonded. 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 to which a group is bonded. By using a specific anti-degradation agent called an anti-degradation agent containing a compound having such a hindered phenol structure, the effect of suppressing a decrease in the molecular weight of the polyol is considered to be very large compared to the conventional case. Moreover, the effect that the adhesive residue preventing property is remarkably superior to the conventional one can be exhibited.

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

  The urethane pressure-sensitive adhesive composition may contain a fatty acid ester. By including a fatty acid ester in the urethane-based pressure-sensitive adhesive composition, improvement in 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, palm fatty acid methyl, methyl laurate, methyl oleate, methyl stearate, myristyl myristate, octyldodecyl myristate, pentaerythritol monooleate, pentaerythritol monostearate, penta Erythritol tetrapalmitate, stearyl stearate, isotridecyl stearate, 2-ethylhexanoic acid triglyceride, Butyl phosphate, octyl oleate. Only one fatty acid ester may be used, or two or more fatty acid esters may be used.

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

  The urethane-based pressure-sensitive adhesive composition can contain any appropriate other component other than the polyol, the polyfunctional isocyanate-based compound, the catalyst, and the deterioration preventing agent as long as the effects of the present invention are not impaired. Examples of such other components include other resin components other than polyurethane resins, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, foils, softeners, plasticizers, conductive agents. , Surface lubricants, leveling agents, heat stabilizers, polymerization inhibitors, lubricants, solvents and the like.

<Preparation of optical surface protective film>
The optical surface protective film has a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition on one side of the polyester film. At that time, the cross-linking by the cross-linking agent of the pressure-sensitive adhesive composition is a pressure-sensitive adhesive layer. Although it is generally performed after application of the adhesive composition, it is also possible to transfer a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition after crosslinking to 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 or the like is removed by drying to remove the pressure-sensitive adhesive layer from the polyester film. It can be manufactured 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. Further, when the pressure-sensitive adhesive composition is applied 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 that the pressure-sensitive adhesive composition can be uniformly applied on the polyester film. You may add a new one.

  Moreover, as a formation method of the said adhesive layer, the well-known method used for manufacture of an adhesive layer is used. Specific examples include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, extrusion coating using a die coater, and the like.

  The thickness of the pressure-sensitive adhesive layer is preferably 3 to 100 μm, more preferably about 5 to 50 μm. When the thickness of the pressure-sensitive adhesive layer is within this range, it is preferable because it is easy to obtain an appropriate balance between removability and adhesion (adhesion).

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

<Base material>
Examples of the substrate include paper and plastic film, and a plastic film is preferably used because of its excellent surface smoothness. The plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer. For example, polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer Examples thereof include a coalesced film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.

  The thickness of the base material is usually 5 to 200 μm, preferably 10 to 100 μm, more preferably 20 to 50 μm. Within this range, it is preferable because it is excellent in workability for bonding to the pressure-sensitive adhesive layer and workability for peeling from the pressure-sensitive adhesive layer.

  If necessary, the base material can be subjected to various surface treatments such as corona discharge treatment, or various surface treatments such as embossing. If necessary, fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, UV absorbers, antistatic agents, lubricants, plasticizers, colorants (pigments, dyes, etc.), etc. These various additives may be blended.

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

<Releasing agent composition>
The release agent composition preferably contains a long-chain alkyl 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 is effectively obtained, and the coating layer formed from the release layer composition has unevenness. 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 materials>
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, and more preferably 12 or more. 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, and long-chain alkyl group-containing quaternary ammonium salts. . In view of heat resistance and contamination, a polymer compound is preferable. Further, from the viewpoint that moderate 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 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 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. Examples of the reactive group include a hydroxyl group, an amino group, a carboxyl group, and an acid anhydride. 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, in view of releasability and ease of handling, (meth) acrylic polymers, polyvinyl alcohol, 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 based on 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, and still more preferably 30 to 70% by weight. Preferably it is 30 to 60% by weight. By being in this range, the obtained release layer is excellent in light release property to the pressure-sensitive adhesive layer.

  Examples of other polymerizable monomers other than the alkyl group-containing (meth) acrylic monomer having 6 or more carbon atoms include hydroxyl group-containing (meth) acrylic monomers, carboxyl group-containing (meth) acrylic monomers, and 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-acryloylmorpholine, a vinyl ether monomer, or the like can be used as appropriate. These polymerizable monomers may be used alone or in combination of two or more.

  Especially, it is preferable to use a carboxyl group-containing (meth) acrylic monomer and a cyano group-containing monomer from the viewpoint of excellent light peelability to the pressure-sensitive adhesive layer of the optical surface protective film and excellent adhesion to the substrate of the separator. 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 include caprolactone mono (meth) acrylate and 2- (meth) acryloyloxyethyl tetrahydrophthalic acid. Examples 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>
Examples of the compound having an alkyl group capable of reacting with the reactive group include, for example, long-chain alkyl group-containing isocyanates such as octyl isocyanate, decyl isocyanate, lauryl isocyanate, octadecyl isocyanate, and behenyl isocyanate, octyl chloride, decyl chloride, Examples 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. Among 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 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 are more preferable. When it exists in this range, since the light peelability with respect to an adhesive layer and the contamination to the adhesive layer of the surface protection film for optics can be suppressed, it 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, serotic acid, mellic 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, monovalent 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, 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. 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 include beeswax (mixture based on myristyl palmitate), 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 carboxylic acid ester is preferably contained in the release agent composition in an amount of 70 to 99% by weight, more preferably 80 to 99% by weight, and still more preferably 90 to 99% by weight. When it exists in this range, it is preferable from the point which is excellent in the light peelability with respect to an adhesive layer.

  Further, the release agent composition may contain other known additives, such as antistatic agents, powders such as colorants, 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, particulates, etc. Can be added as appropriate according to the intended use.

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

  The method for forming the release layer on the substrate is not particularly limited. For example, the release agent composition solution is applied to the substrate, and the polymerization solvent and the like are removed by drying to form the release layer on the substrate. It is produced by forming. Thereafter, curing may be performed for the purpose of adjusting the component transfer of the release layer. Further, when the release agent composition is applied onto the substrate to produce a release layer, the release agent composition contains at least one polymerization solvent other than the polymerization solvent so that it can be uniformly applied onto the substrate. A new solvent may be added.

  Moreover, as a formation method of the said release layer, the well-known method used for manufacture of a release layer is used. Specific examples include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, extrusion coating using 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. When the thickness of the release layer is too small, it is difficult to peel the separator, and therefore, the work of attaching the optical surface protective film may be difficult. On the other hand, if it is too thick, it may affect the contamination of the pressure-sensitive adhesive layer of the optical surface protective film.

<Lamination of optical surface protective film and separator>
The optical surface protective film with a separator of the present invention is 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 protective 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 protective film to separator>
As shown in FIG. 2, the optical surface protective film 3 with a separator of the present invention is cut into 10 mm × 50 mm, and a double-sided tape is pasted on 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 with a chuck, and further, the portion of the separator 1 that is not fixed with the acrylic plate 4 is cut, and the optical surface protection film 2 to which the separator 1 is not bonded is sandwiched with the chuck and fixed. The maximum value of shear force when pulled in the shear direction at 0.06 m / min was defined as shear adhesive strength (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 difficult to shift, and the stress when the optical surface protective film with a separator is bent is less likely to be relaxed. A surface protective film can be obtained and is preferable.

<Measurement of peel strength of separator on optical surface protective film>
In the optical surface protective film with a separator of the present invention, the optical surface protective film and the separator are bonded together and left to stand at 23 ° C. and 50% RH for 20 minutes, and then the peeling angle is 180 degrees and the peeling speed is 0.3 m / min. By peeling the separator depending on the conditions, the peeling force (N / 50 mm) of the separator with respect to the optical surface protective film can be obtained. The peeling force of the separator with respect 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. When it is in this range, the separator is excellent in peelability from the optical surface protective film, and further in a separator having excellent workability at the time of bonding.

<Measurement of peel strength of optical surface protective film for glass>
In the optical surface protective film with a separator of the present invention, the pressure-sensitive adhesive layer of the optical surface protective film from which the separator has been peeled is bonded to the surface of the glass plate with a 2 kg roller, and then subjected to conditions of 23 ° C. and 50% RH. After 20 minutes, the peeling force (N / 25 mm) of the optical surface protective film to the glass is obtained by peeling the optical surface protective film under the conditions of a peeling angle of 180 degrees and a tensile speed of 0.3 m / min. Can do. The peel strength of the optical surface protective film for 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, and 0.06 N / 25 mm. The following is more preferable, and 0.04 N / 25 mm or less is most preferable. Moreover, 0.01 N / 25mm or more is preferable. When in this range, the pressure-sensitive adhesive layer is excellent in releasability 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. In addition, the evaluation item in an Example etc. measured as follows.

<Example 1>
<Preparation of (meth) acrylic polymer>
A four-flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a cooler, 100 parts by weight of 2-ethylhexyl acrylate (2EHA, manufactured by Toa Gosei), 2-hydroxyethyl acrylate (HEA, manufactured by Toa Gosei, Aplix) (HEA) 4 parts by weight, 2,2′-azobisisobutyronitrile (Wako Pure Chemical Industries, AIBN) 0.2 part by weight as polymerization initiator, ethyl acetate (manufactured by Showa Denko, ethyl acetate) 205 parts by weight Nitrogen gas was introduced while gently stirring, and the polymerization temperature was maintained at around 63 ° C. for about 4 hours to prepare a (meth) acrylic polymer solution (about 35% by weight). The (meth) acrylic polymer had a weight average molecular weight (Mw) of 650,000 and Tg of −68.3 ° C.

<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 hexamethylene diisocyanate isocyanate is added to 100 parts by weight (solid content) of the (meth) acrylic polymer in this solution. 4 parts by weight of a nurate body (manufactured by Nippon Polyurethane Industry Co., Ltd., Coronate HX), 0.015 part by weight of dioctyltin laurate (manufactured by Tokyo Fine Chemicals, ENBOLIZER OL-1) as a tin-based catalyst, and 3 parts by weight of acetylacetone as a crosslinking retarder In addition, the acrylic pressure-sensitive adhesive composition was prepared by mixing and stirring for about 1 minute while maintaining around 25 ° C.

<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 was used. The base material was a polyester film, and the release layer was formed of a release agent composition containing pentaerythritol fatty acid ester and octadecyl isocyanate.

<Preparation of optical surface protective film with separator>
The acrylic pressure-sensitive adhesive composition was applied to one side of a polyester film (Mitsubishi Resin, Diafoil T100C38, thickness 38 μm) and heated at 130 ° C. for 60 seconds to form a pressure-sensitive adhesive layer having a thickness of 10 μm. Next, the release layer of the separator having the non-silicone release layer was bonded 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 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 weight average molecular weight (Mw) of the acrylic polymer of Example 3 was 580,000, and Tg was −67.6 ° C. The acrylic polymer of Example 4 has a weight average molecular weight of 610,000 and Tg of −50.3 ° C. As an iron-based catalyst, tris (acetylacetonato) iron (manufactured by Nippon Chemical Industry Co., Ltd., trade name “ "Nersem Ferric"), Tetrad C (Mitsubishi Gas Chemical Co., Ltd.) was used as the epoxy-based crosslinking agent, and Aqualon HS-10 (Daiichi Kogyo Seiyaku Co., Ltd.) was used as the surfactant.

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

  Using the 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.

<Comparative Examples 1-3>
<Separator having silicone release layer>
100 parts by weight of a silicone release agent (manufactured by Shin-Etsu Chemical Co., Ltd., KS-847H), 3.3 parts by weight of a silicone curing catalyst (manufactured by Shin-Etsu Chemical Co., Ltd., CAT-PL-50T), toluene (manufactured by Idemitsu Petrochemical), Hexane (manufactured by Maruzen Petrochemical Co., Ltd., normal hexane) and methyl ethyl ketone (manufactured by Idemitsu Kosan Co., Ltd., 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 Resin, Diafoil T100-25) and dried at 130 ° C. for 1 minute to have a silicone release layer for Comparative Examples 1-3. 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 a separator having the silicone-based release layer, optical separators with optical separators of Comparative Examples 1 to 3 were produced in the same manner as in Example 1. .

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

  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.

Device: HLC-8220GPC, manufactured by Tosoh Corporation
Sample column: manufactured by Tosoh Corporation, TSK guard column Super HZ-H (1) + TSK gel Super HZM-H (2)
Reference column; manufactured by Tosoh Corporation, TSKgel Super H-RC (1)
Flow rate: 0.6ml / 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 in terms of polystyrene.

<Measurement of glass transition temperature (Tg) of (meth) acrylic polymer>
The glass transition temperature (Tg) (° C.) was determined by the following formula 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.) represents the glass transition temperature of the copolymer, Wn represents the weight fraction of each monomer, Tgn (° C.) represents the glass transition temperature of the homopolymer of each monomer, and n represents the type of each monomer. )
2-ethylhexyl acrylate (2EHA): -70 ° C
Hydroxyethyl acrylate (HEA): -15 ° C
4-hydroxybutyl acrylate (HBA): -32 ° C
Acrylic acid (AA): 106 ° C
In addition, as a reference value, “Synthesis / design of acrylic resin and development of new application” (published by Central Management Development Center Publishing Department) was referred.

<Measurement of shear adhesive strength of optical surface protective film to separator>
As shown in FIG. 2, the obtained optical surface protective film with a separator was cut into 10 mm × 50 mm, a double-sided tape was attached to the separator side of the 10 mm × 10 mm portion, and an acrylic plate (70 mm long, 100 mm wide) And a thickness of 1 mm). The upper part of the acrylic plate is sandwiched between chucks, and the portion of the separator that is not fixed with the acrylic plate is cut, and the optical surface protection film that is not bonded to the separator is sandwiched between the chucks and fixed, and the pulling speed is 0.06 m / min. Thus, the maximum value of the shearing force when pulled in the shearing direction was defined as the shear adhesive strength (N / 10 mm) of the optical surface protective film to the separator.

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

<Measurement of peel strength of separator on optical surface protective film>
The obtained optical surface protective 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 adhered was fixed to the SUS plate (SUS304BA). After leaving in an environment of 23 ° C. and 50% relative humidity 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 protective film (N / 50 mm) Was measured.

<Evaluation of separator peelability>
The separator peelability was evaluated as good (O) when the peel strength of the separator with respect to the optical surface protective film was 0.3 N / 50 mm or less, and as poor (X) when larger than 0.3 N / 50 mm.

<Measurement of peel strength of optical surface protective film for glass>
The obtained optical surface protective film with a separator was cut to a width of 25 mm, the separator was peeled off, and the glass plate (made by Matsunami Glass, blue plate edge polished product, OF1) was bonded using a 2 kg roller, It was left in an environment with a relative humidity of 50% for about 20 minutes. Thereafter, the optical surface protective film was peeled off at an angle of 180 degrees at a speed of 0.3 m / min, and the peel force (N / 25 mm) of the optical surface protective film to the glass was measured.

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

  On the other hand, since the shear adhesive force with respect 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 a separator is the same as that of the example. In comparison, it was confirmed that the material was easily deformed with respect to external force and inferior in handling properties. Furthermore, since the peeling force with respect to the optical surface protective film of the separator obtained in Comparative Example 4 is greater than 0.3 N / 50 mm, the optical surface protective film with a separator is a separator as compared with the example. It was confirmed that it was inferior in the peelability with respect to the adhesive layer.

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 surface of the polyester film, and an optical surface protective film with a separator, having a separator on the surface opposite to the polyester film of the adhesive layer,
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-based pressure-sensitive adhesive composition,
The separator has a base material and a non-silicone release layer,
The shear adhesive strength of the optical surface protective film to the separator is 15 N / 10 mm or more at a tensile speed of 0.06 m / min, and
An optical surface protective film with a separator, wherein 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 degrees and a peeling speed of 0.3 m / min. The (meth) acrylic polymer (A) includes, 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 per 100 parts by weight of the alkyl group-containing (meth) acrylic monomer having 2 to 14 carbon atoms. The surface protective film for optics with a separator of description.   3. The optical surface protective film with a separator according to claim 1, wherein the crosslinking agent (B) is a polyfunctional isocyanate compound and / or a polyfunctional epoxy compound.   The polyfunctional isocyanate compound and / or polyfunctional epoxy compound is contained in an amount of 2 to 25 parts by weight with respect to 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 optical system with a separator according to any one of claims 1 to 4, 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 protective film.

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