JP2017177739A - Laminate and wound body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film/masking film laminate and a wound body suppressing generation of zipping and further preferably suppressing generation of blocking even after long term storage.SOLUTION: There is provided a laminate 100 containing a substrate film 111, a hard coat film containing a hard coat layer 112 arranged on at least one surface of the substrate film 111 and a masking film 120 laminated to a surface of the hard coat film on a hard coat layer 112 side and having peel strength Fof the masking film 120 and the hard coat layer 112 of 0.01-0.15 N/25 mm and a wound body thereof.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminate that can be used for applications such as an optical film, and a wound body of the laminate.

  It has been widely performed to manufacture a film used for an application such as an optical film by using a resin as a material, and further laminate a film by bonding the film and another film. For example, when manufacturing a polarizing plate provided with a polarizer and a protective film, a base film is manufactured, and it is bonded to the polarizer as a protective film. As the protective film, a hard coat film including a base film and a hard coat layer provided on one side thereof may be used. When such a hard coat film is used as a protective film, advantages such as an increase in the surface hardness of the resulting polarizing plate can be obtained.

  In many cases, such a hard coat film is produced in large quantities as a long film prior to the production of a laminate for the purpose of production efficiency. In many cases, the hard coat film produced in large quantities needs to be stored and transported for a long period of time, so that it is in a wound state suitable for storage and transport. As an example of a wound body of a hard coat film, a hard coat film / masking film laminated body is obtained by superposing a hard coat film and a masking film, and a wound body is used (for example, patent document). 1).

JP 2013-047000 A

  The quality of the wound body of the hard coat film / masking film laminate can be reduced by storing it for a long time. For example, when the wound body of the hard coat film / masking film laminate is stored for a long time and then the laminate is unwound and the masking film is peeled off, zipping may occur. Zipping refers to a phenomenon in which the progress of peeling from one end to the other end of the film does not progress constantly, and the progress and stop of peeling are repeated. When zipping occurs at the time of peeling of the masking film, streaky defects occur on the surface of the hard coat film after peeling, and the quality of the film may be impaired.

  In addition, for example, when the wound body of the hard coat film / masking film laminate is stored for a long period of time, blocking (a phenomenon in which the laminated body that is superposed on the wound body is bonded) may occur. When the laminate is unwound from the wound body that has been blocked, the laminate may be caught or the laminate may be broken.

  Accordingly, an object of the present invention is to provide a hard coat film / masking film laminate and a wound body, in which the occurrence of zipping is suppressed, even more preferably, the occurrence of blocking is suppressed even after storage for a long period of time. It is in.

As a result of studies conducted by the present inventor to solve the above problems, in the case of a laminate using a combination of a hard coat film and a masking film, the peel strength between the hard coat film and the masking film is within a specific range. As a result, the present inventors have found that the above-mentioned problems can be solved.
Therefore, according to the present invention, the following is provided.

[1] A hard coat film including a base film, and a hard coat layer provided on at least one side of the base film;
And a masking film bonded to the surface of the hard coat film on the hard coat layer side,
The peel strength _{F 1} between the masking film and the hard coat layer is 0.01~0.15N / 25mm, laminate.
[2] The laminate according to [1], wherein the base film is a resin film including an alicyclic structure-containing polymer, and the base film has a thickness of 50 μm or less.
[3] The laminate according to [1] or [2], wherein the masking film is a resin film containing polyester or polyolefin.
[4] The laminated body according to any one of [1] to [3], which is a wound body having a long shape and a length of 1000 m or more, A wound body in which the peel strength Fc between the masking film and the hard coat layer and the peel strength Fo between the masking film and the hard coat layer for the outside of the roll satisfy a relationship of Fc / Fo <1.2.
[5] The surface of the hard coat layer side after peeling the masking film from the hard coat layer has a contact angle with water of 60 ° to 100 °, and the masking film in the core portion is Contact angle Ac (°) with water on the hard coat layer side surface after peeling from the hard coat layer, and the hard coat layer after peeling the masking film from the hard coat layer in the unwinding portion The wound body according to [4], wherein a contact angle Ao (°) with water on the surface on the side satisfies a relationship of | Ac-Ao | <10.
[6] The width of the masking film is narrower than the width of the hard coat film, and the hard coat film protrudes from the masking film at both ends in the width direction. Of the protruding amount of film, the larger protruding amount is more than 0 and less than 7.5 mm.
The wound body according to [4] or [5].

  The laminated body of the present invention and the wound body of the present invention, which is a wound body thereof, have a hard coat film / masking film laminated body and a wound body in which the occurrence of blocking and zipping is suppressed even after long-term storage. It can be.

FIG. 1 is a cross-sectional view schematically showing the layer structure of the laminate of the present invention. FIG. 2 is a plan view schematically showing a state in which a part of the laminated body is unwound from the wound body of the present invention.

  Hereinafter, the present invention will be described in detail with reference to embodiments and examples, but the present invention is not limited to the following embodiments and examples, and the claims of the present invention and equivalents thereof. Any change can be made without departing from the scope described above.

  In the present application, expressions such as “(meth) acryl”, “(meth) acrylate”, and “(meth) acryloyl” mean acrylic, methacrylic, or a combination thereof. For example, (meth) acrylate means acrylate, methacrylate, or a combination thereof, and (meth) acryloyl group means an acryloyl group, a methacryloyl group, or a combination thereof.

  In the present application, the “long” film means a film having a length of 100 times or more with respect to the width of the film. Specifically, the film is long enough to be wound up and stored or transported. It has a thickness.

[1. (Outline of laminate)
The laminate of the present invention includes a specific hard coat film and a masking film. The hard coat film includes a base film and a hard coat layer provided on at least one side of the base film. The masking film is bonded to the surface of the hard coat film on the hard coat layer side.

  FIG. 1 is a cross-sectional view schematically showing the layer structure of the laminate of the present invention. In FIG. 1, the cross section which cut | disconnected the long laminated body for setting it as a wound body by the surface perpendicular | vertical to the longitudinal direction is shown. In FIG. 1, the laminate 100 includes a hard coat film 110 and a masking film 120. The hard coat film 110 includes a base film 111 and a hard coat layer 112 provided on one side of the base film 111. The masking film 120 is bonded to the surface of the hard coat film 110 on the hard coat layer 112 side.

[2. (Base film)
Examples of the material for the base film include resins containing various polymers. Such polymers include hydrocarbon polymers, (meth) acrylic polymers and polyesters.

  The hydrocarbon polymer refers to a polymer in which at least a part of the repeating unit of the polymer is a hydrocarbon group. The proportion of the hydrocarbon group which is a repeating unit in the hydrocarbon polymer can be appropriately selected according to the purpose of use, but is preferably 55% by weight or more, more preferably 70% by weight or more, and particularly preferably 90% by weight. That's it.

  As the hydrocarbon polymer, an alicyclic structure-containing polymer is preferable. An alicyclic structure-containing polymer is a polymer having an alicyclic structure in the repeating unit of the polymer, a polymer having an alicyclic structure in the main chain, and an alicyclic structure in the side chain. Any of the polymers it has may be used. Among these, a polymer containing an alicyclic structure in the main chain is preferable from the viewpoint of mechanical strength, heat resistance, and the like.

  Examples of the alicyclic structure include a saturated alicyclic hydrocarbon (cycloalkane) structure and an unsaturated alicyclic hydrocarbon (cycloalkene, cycloalkyne) structure. Among these, from the viewpoints of mechanical strength, heat resistance and the like, a cycloalkane structure and a cycloalkene structure are preferable, and a cycloalkane structure is particularly preferable.

  The number of carbon atoms constituting the alicyclic structure is preferably 4 or more, more preferably 5 or more, preferably 30 or less, more preferably 20 or less, particularly preferably per alicyclic structure. Is in the range of 15 or less, the mechanical strength, heat resistance, and film formability are highly balanced, which is preferable.

  The proportion of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer can be appropriately selected according to the purpose of use, but is preferably 55% by weight or more, more preferably 70% by weight or more, particularly preferably. 90% by weight or more. When the ratio of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer is in this range, it is preferable from the viewpoint of transparency and heat resistance of the film.

  Examples of alicyclic structure-containing polymers include norbornene polymers, monocyclic olefin polymers, cyclic conjugated diene polymers, vinyl alicyclic hydrocarbon polymers, and hydrides thereof. Can be mentioned. Among these, norbornene-based polymers can be suitably used because of their good transparency and moldability.

  As the norbornene-based polymer, for example, a ring-opening polymer of a monomer having a norbornene structure, a ring-opening copolymer of a monomer having a norbornene structure and another monomer, or a hydride thereof; An addition polymer of a monomer having a norbornene structure, an addition copolymer of a monomer having a norbornene structure and another monomer, or a hydride thereof. Among these, a ring-opening (co) polymer hydride of a monomer having a norbornene structure is particularly suitable from the viewpoints of transparency, moldability, heat resistance, low hygroscopicity, dimensional stability, lightness, and the like. Can be used. “(Co) polymer” means a polymer and a copolymer.

Examples of the monomer having a norbornene structure include bicyclo [2.2.1] hept-2-ene (common name: norbornene), tricyclo [4.3.0.1 ^2,5 ] deca-3,7. -Diene (common name: dicyclopentadiene), 7,8-benzotricyclo [4.3.0.1 ^2,5 ] dec-3-ene (common name: methanotetrahydrofluorene), tetracyclo [4.4. 0.1 ^2,5 . ^{17, 10} ] dodec-3-ene (common name: tetracyclododecene), and derivatives of these compounds (for example, those having a substituent in the ring). Here, examples of the substituent include an alkyl group, an alkylene group, and a polar group. Moreover, these substituents may be the same or different, and a plurality thereof may be bonded to the ring. One type of monomer having a norbornene structure may be used alone, or two or more types may be used in combination at any ratio.

  Examples of the polar group include a hetero atom or an atomic group having a hetero atom. Examples of the hetero atom include an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, and a halogen atom. Specific examples of the polar group include a carboxyl group, a carbonyloxycarbonyl group, an epoxy group, a hydroxyl group, an oxy group, an ester group, a silanol group, a silyl group, an amino group, a nitrile group, and a sulfonic acid group.

  Other monomers capable of ring-opening copolymerization with a monomer having a norbornene structure include, for example, monocyclic olefins such as cyclohexene, cycloheptene, and cyclooctene and derivatives thereof; and cyclic conjugates such as cyclohexadiene and cycloheptadiene. Dienes and derivatives thereof; and the like. As the other monomer capable of ring-opening copolymerization with a monomer having a norbornene structure, one type may be used alone, or two or more types may be used in combination at any ratio.

  A ring-opening polymer of a monomer having a norbornene structure and a ring-opening copolymer with another monomer copolymerizable with a monomer having a norbornene structure are, for example, a known ring-opening monomer. It can be obtained by polymerization or copolymerization in the presence of a polymerization catalyst.

  Examples of other monomers that can be addition copolymerized with a monomer having a norbornene structure include α-olefins having 2 to 20 carbon atoms such as ethylene, propylene, and 1-butene, and derivatives thereof; cyclobutene, cyclopentene, And cycloolefins such as cyclohexene and derivatives thereof; non-conjugated dienes such as 1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene; and the like. Among these, α-olefin is preferable and ethylene is more preferable. As the other monomer capable of addition copolymerization with a monomer having a norbornene structure, one type may be used alone, or two or more types may be used in combination at any ratio.

  An addition polymer of a monomer having a norbornene structure and an addition copolymer of another monomer copolymerizable with the monomer having a norbornene structure are, for example, a known addition polymerization catalyst. It can be obtained by polymerization or copolymerization in the presence.

  Examples of the monocyclic olefin polymer include addition polymers of a cyclic olefin monomer having a single ring such as cyclohexene, cycloheptene, and cyclooctene.

  Examples of the cyclic conjugated diene polymer include polymers obtained by cyclization reaction of addition polymers of conjugated diene monomers such as 1,3-butadiene, isoprene and chloroprene; cyclic conjugates such as cyclopentadiene and cyclohexadiene. And 1,2- or 1,4-addition polymers of diene monomers; and their hydrides.

  Examples of vinyl alicyclic hydrocarbon polymers include polymers of vinyl alicyclic hydrocarbon monomers such as vinylcyclohexene and vinylcyclohexane and their hydrides; vinyl aromatic hydrocarbons such as styrene and α-methylstyrene. Hydrogenated product obtained by hydrogenating an aromatic ring part contained in a polymer obtained by polymerizing monomers; vinyl alicyclic hydrocarbon monomer, or vinyl aromatic hydrocarbon monomer and vinyl aromatic hydrocarbon monomer And an aromatic ring hydride of a copolymer such as a random copolymer or a block copolymer with another copolymerizable monomer. Examples of the block copolymer include a diblock copolymer, a triblock copolymer or a multi-block copolymer having more than that, a gradient block copolymer, and the like.

  The molecular weight of the hydrocarbon polymer is appropriately selected according to the purpose of use, but gel permeation chromatography using cyclohexane as a solvent (however, if the sample does not dissolve in cyclohexane, toluene may be used). The polyisoprene or polystyrene-equivalent weight average molecular weight (Mw) measured in (1) is usually 10,000 or more, preferably 15,000 or more, more preferably 20,000 or more, and usually 100,000 or less, preferably 80,000. 000 or less, more preferably 50,000 or less. When the weight average molecular weight is in such a range, the mechanical strength and molding processability of the film are highly balanced and suitable.

  The molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of the hydrocarbon polymer is usually 1.2 or more, preferably 1.5 or more, more preferably 1.8 or more, usually 3.5. Hereinafter, it is preferably 3.0 or less, more preferably 2.7 or less. When the molecular weight distribution of the hydrocarbon polymer exceeds 3.5, the low molecular component increases, so the component with a short relaxation time increases, and even when the film has the same in-plane retardation Re, the relaxation during high temperature exposure is short. It is estimated that it will increase with time, and the stability of the film may be reduced. On the other hand, when the molecular weight distribution is less than 1.2, the productivity of the hydrocarbon polymer can be reduced and the cost can be increased.

  The glass transition temperature of the hydrocarbon polymer can be appropriately selected according to the purpose of use, but is preferably 130 ° C. or higher, more preferably 135 ° C. or higher, preferably 150 ° C. or lower, more preferably 145 ° C. or lower. . When the glass transition temperature is lower than 130 ° C., durability at high temperatures may be deteriorated. When the glass transition temperature is higher than 150 ° C., durability is improved, but normal processing may be difficult.

  The saturated water absorption of the hydrocarbon polymer is preferably 0.03% by weight or less, more preferably 0.02% by weight or less, and particularly preferably 0.01% by weight or less. When the saturated water absorption is in the above range, the temporal change of the front phase difference Re and the thickness direction phase difference Rth of the film can be reduced. Moreover, deterioration of a polarizing plate and a display apparatus provided with the obtained base film can be suppressed, and display on the display can be stably and satisfactorily maintained over a long period.

  The saturated water absorption is a value expressed as a percentage with respect to the weight of the test piece before immersion, which is obtained by immersing the test piece in water at a constant temperature for a fixed time. Usually, it is measured by immersing in 23 ° C. water for 24 hours. The saturated water absorption in the alicyclic structure-containing polymer can be adjusted to the above range, for example, by reducing the amount of polar groups in the alicyclic structure-containing polymer. From the viewpoint of lowering the saturated water absorption, the alicyclic structure-containing polymer preferably has no polar group.

  The resin constituting the base film may contain other optional components in addition to the polymer such as the alicyclic structure-containing polymer unless the effects of the present invention are significantly impaired. Examples of optional components include colorants such as pigments and dyes; fluorescent brighteners; dispersants; thermal stabilizers; light stabilizers; ultraviolet absorbers; antistatic agents; antioxidants; Examples include fillers such as amide and calcium stearate; and additives such as nucleating agents. As the optional component, one type may be used alone, or two or more types may be used in combination at any ratio. However, the resin constituting the base film generally contains a polymer such as an alicyclic structure-containing polymer, generally about 50% to 100%, or about 70% to 100%.

  The base film is obtained by molding a resin by a known film molding method. As the film forming method, any method capable of forming a long film can be adopted. For example, a cast molding method, an extrusion molding method, an inflation molding method and the like can be mentioned. Among these, a melt extrusion method that does not use a solvent can reduce the amount of residual volatile components efficiently, and is preferable from the viewpoints of the global environment and work environment, and excellent manufacturing efficiency. Examples of the melt extrusion method include an inflation method using a die, and a method using a T die is preferable in terms of excellent productivity and thickness accuracy. The film obtained by the melt extrusion method can be used as it is as a base film, or it may be used as a film having optical anisotropy after performing a treatment such as stretching as necessary.

  When an unstretched film is stretched to form a base film, the stretching may be performed in a uniaxial stretching process in which stretching is performed only in one direction, or in a biaxial stretching process in which stretching is performed in different two directions. Also good. In addition, in the biaxial stretching process, a simultaneous biaxial stretching process in which stretching processes are performed simultaneously in two directions may be performed, and a sequential biaxial stretching process in which a stretching process is performed in one direction and then a stretching process is performed in another direction. May be performed. Further, the stretching is a longitudinal stretching process in which a stretching process is performed in the longitudinal direction of the film before stretching, a lateral stretching process in which a stretching process is performed in the width direction of the film before stretching, and neither parallel nor perpendicular to the width direction of the film before stretching. Any of the oblique stretching processes in which the stretching process is performed in an oblique direction may be performed, or a combination thereof may be performed. Among these stretching treatments, the oblique stretching treatment is preferable from the viewpoint of easily producing a base film having a slow axis that forms an angle of 40 ° to 50 ° with respect to at least one side. Examples of the stretching method include a roll method, a float method, and a tenter method.

  In the case of stretching, the stretching temperature and the stretching ratio can be arbitrarily set within a range in which a base film having a desired in-plane retardation can be obtained. Specifically, the stretching temperature is preferably Tg-30 ° C or higher, more preferably Tg-10 ° C or higher, preferably Tg + 60 ° C or lower, more preferably Tg + 50 ° C or lower. The draw ratio is preferably 1.1 times or more, more preferably 1.2 times or more, particularly preferably 1.5 times or more, preferably 30 times or less, more preferably 10 times or less, particularly preferably. 5 times or less.

The base film may be a single layer film composed of one resin layer or a multilayer film composed of two or more resin layers. When the base film is a multilayer film, the resin constituting each resin layer can be any of the examples described above, for example.
The thickness of the base film is arbitrary, and can be appropriately adjusted to a desired thickness suitable for a desired use of the hard coat film such as an optical film. The thickness of the base film is preferably 5 μm or more, more preferably 10 μm or more, while preferably 50 μm or less, more preferably 30 μm or less. When the thickness of the base film is reduced, the base film can be usefully used as a material constituting the thin optical device, but breakage tends to occur. However, the laminate of the present invention can be a laminate in which breakage is suppressed even when the thickness of the base film is as thin as the above upper limit.

[3. Hard coat layer)
The hard coat layer included in the hard coat film may be a layer containing an ultraviolet curable acrylic resin. The hard coat layer can be provided on the base film by applying the hard coat composition to the surface of the base film and curing it. The hard coat composition may include an ultraviolet curable acrylic resin. The hard coat composition may further contain a solid and a solvent other than the ultraviolet curable acrylic resin as optional components.

  The thickness of the hard coat layer is arbitrary and can be appropriately adjusted to a desired thickness suitable for a desired use of the hard coat film such as an optical film. Usually, the thickness of the hard coat layer is preferably 0.5 μm or more, more preferably 1.0 μm or more, while preferably 10 μm or less, more preferably 5 μm or less.

(UV curable acrylic resin)
The ultraviolet curable acrylic resin used for forming the hard coat layer in the present invention is not particularly limited as long as it is a commonly used ultraviolet curable acrylic resin component for hard coat. As a specific example of the ultraviolet curable acrylic resin component, an ultraviolet curable resin composition containing a polyfunctional (meth) acrylic compound as a main component is preferable.

  Here, as the polyfunctional (meth) acrylic compound, for example, trimethylolpropane triacrylate, ditrimethylolpropane tetraacrylate, isocyanur EO-modified triacrylate, pentaerythritol triacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, Hexafunctional (meth) acrylic compounds such as dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, ethylene oxide adduct of dipentaerythritol hexaacrylate, or ethylene oxide with H substituted by fluorine, such as pentaerythritol tetra Ethylene oxide adduct of acrylate, pentaerythritol tetraacrylate, or ethylene oxide Or the like can be used tetrafunctional (meth) acrylic compounds such as the H-Id those fluorine-substituted. These may be used alone or in combination of two or more.

(Inorganic fine particles)
The hard coat composition may contain inorganic fine particles in addition to the ultraviolet curable acrylic resin. Examples of inorganic fine particles include silica (including organosilica sol), alumina, titania, zeolite, mica, synthetic mica, calcium oxide, zirconium oxide, antimony pentoxide, zinc oxide, magnesium fluoride, smectite, synthetic smectite, vermiculite, Examples thereof include at least one selected from the group consisting of ITO (indium oxide / tin oxide), ATO (antimony oxide / tin oxide), tin oxide, indium oxide, and antimony oxide. Among these, silica fine particles are preferable because the effect of improving the surface hardness can be particularly increased, the strength can be particularly increased, and a desired refractive index can be obtained.

  When silica fine particles are used as the inorganic fine particles, it is preferable to use silica fine particles whose surface has not been treated. The surface untreated silica fine particles are those whose oil absorption calculated by the oil absorption measuring method specified in JIS K 5101 is 250 ml / 100 g or more. By using untreated silica fine particles, the hard coat layer and the base film Can be exhibited.

  The refractive index of the inorganic fine particles used is 1.40 to 1.70, preferably 1.40 to 1.60, and more preferably 1.40 to 1.50. The average particle size of the inorganic fine particles is 100 nm or less, preferably 70 nm or less, more preferably 50 nm or less. When the thickness exceeds 100 nm, light scattering occurs, and the transmittance of the hard coat is lowered or colored, which is not preferable from the viewpoint of transparency. Here, the average particle diameter is the number average particle diameter as with the organic particles, and can be measured by a laser diffraction / scattering method.

  The content of the inorganic fine particles is 1 part by weight or more and 100 parts by weight or less, preferably 3 parts by weight or more and 50 parts by weight or less, more preferably 5 parts by weight or more with respect to 100 parts by weight of the ultraviolet curable acrylic resin solid content. 30 parts by weight or less. When the average particle size and content of the organic particles are within the above range, and the content of inorganic fine particles and the average particle size are within the above range, the slip property can be expressed.

(Other ingredients)
In addition to the inorganic fine particles, the hard coat composition includes a photosensitizer, a polymerization inhibitor, a polymerization initiation assistant, a leveling agent, a wettability improver, a surfactant, a plasticizer, an ultraviolet absorber, and an antioxidant. Any component such as an antistatic agent, a silane coupling agent, and a light stabilizer may be added. As the leveling agent, a general leveling agent can be used. For example, a fluorine-based nonionic surfactant, an acrylic leveling agent, a silicone leveling agent, and the like can be used, and one or more of these can be used. Can do. Among them, acrylic leveling agents are preferable. The amount of the leveling agent used is preferably 0.001 part by weight or more and 1.0 part by weight or less with respect to 100 parts of the hard coat layer forming resin. More preferably, it is desirable to use 0.01 parts by weight or more and 0.1 parts by weight or less. By using a leveling agent, the leveling agent bleeds to the air interface during pre-drying and solvent drying, so that it is possible to prevent the UV-curable resin from being inhibited by oxygen and hard enough to have sufficient hardness even on the outermost surface. A coat layer can be obtained. Furthermore, the acrylic leveling agent has an advantage that it can impart a characteristic excellent in recoatability because it has low activity and does not lower the surface tension.

  The polymerization initiator is not particularly limited as long as it has the ability to initiate polymerization by ultraviolet rays. For example, monocarbonyl compounds, dicarbonyl compounds, acetophenone compounds, benzoin ether compounds, acylphosphine oxide compounds, aminocarbonyl compounds, and the like can be used. .

  Specifically, monocarbonyl compounds include benzophenone, 4-methyl-benzophenone, 2,4,6-trimethylbenzophenone, methyl-o-benzoylbenzoate, 4-phenylbenzophenone, 4- (4-methylphenylthio) phenyl. -Ethanone, 3,3'-dimethyl-4-methoxybenzophenone, 4- (1,3-acryloyl-1,3,3'-dimethyl-4-methoxybenzophenone, 4- (1,3-acryloyl-1,4 , 7,10,13-pentaoxotridecyl) benzophenone, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, 4-benzoyl-N, N, N-trimethyl-1-propanamine Hydrochloride, 4-benzoyl-N, N-dimethyl-N-2- (1-oxo-2-propenyl) Oxyethyl) metaammonium oxalate, 2- / 4-iso-propylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, 1-chloro-4-propoxythioxanthone, 2-hydroxy-3- (3 4-dimethyl-9-oxo-9H thioxanthone-2-yloxy-N, N, N-trimethyl-1-propanamine hydrochloride, benzoylmethylene-3-methylnaphtho (1,2-d) thiazoline, and the like.

  Examples of the dicarbonyl compound include 1,2,2-trimethyl-bicyclo [2.1.1] heptane-2,3-dione, benzyl, 2-ethylanthraquinone, 9,10-phenanthrenequinone, and methyl-α-oxobenzene. Examples include acetate and 4-phenylbenzyl.

  Examples of acetophenone compounds include 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4-Isopropylphenyl) -2-hydroxy-di-2-methyl-1-phenylpropan-1-one, 1-hydroxy-cyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-styrylpropan-1-one Polymer, diethoxyacetophenone, dibutoxyacetophenone, 2,2-dimethoxy-1,2-diphenylethane-1-one, 2,2-diethoxy-1,2-diphenylethane-1-one, 2-methyl-1 -[4- (Methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethyl Mino-1- (4-morpholinophenyl) butan-1-one, 1-phenyl-1,2-propanedione-2- (o-ethoxycarbonyl) oxime, 3,6-bis (2-methyl-2-morpholino -Propanonyl) -9-butylcarbazole and the like.

  Examples of the benzoin ether compound include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and benzoin normal butyl ether.

  Examples of the acylphosphine oxide compound include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 4-n-propylphenyl-di (2,6-dichlorobenzoyl) phosphine oxide, and the like.

  Examples of aminocarbonyl compounds include methyl-4- (dimethoxyamino) benzoate, ethyl-4- (dimethylamino) benzoate, 2-n-butoxyethyl-4- (dimethylamino) benzoate, and isoamyl-4- (dimethylamino) benzoate. 2- (dimethylamino) ethylbenzoate, 4,4′-bis-4-dimethylaminobenzophenone, 4,4′-bis-4-diethylaminobenzophenone, 2,5′-bis (4-diethylaminobenzal) cyclopenta Non etc. are mentioned.

  Examples of commercially available polymerization initiators include Irgacure 184, 651, 500, 907, 127, 369, 784, 2959 manufactured by Ciba Specialty Chemicals Co., Ltd., Lucirin TPO manufactured by BASF, Esacure One manufactured by Nippon Sibel Hegner Co. It is done. These photopolymerization initiators may be used alone or in combination of two or more. Although there is no restriction | limiting in particular regarding the usage-amount of a photoinitiator, It is preferable to use within the range of 1-20 weight part with respect to 100 weight part of ultraviolet curable resin compositions.

  In order to maintain the light stability of the hard coat layer, an ultraviolet absorber, a light stabilizer, or a combination thereof can be used. By adding this, the adhesion between the hard coat layer and the substrate can be maintained for 50 hours or more even in a light resistance test exposed to carbon arc light for a long time. Examples of commercially available ultraviolet absorbers include benzotriazoles (for example, trade name Tinuvin 234, 326, 329, 213, and 571 by BASF) and triazines (for example, trade name Tinuvin 157 by BASF), Examples of light stabilizers include hindered amines (for example, BASF Corporation, trade names Tinuvin 622, 144, 765, 770, 765, 111, 783, 791, 123, and 119, and ADEKA Corporation, trade name ADK STAB LA. -52, LA-57, LA-63P, LA-68, LA-72, LA-77, LA-81, LA-82, LA-87, and LA-94)). Further, the ultraviolet absorber and / or the light stabilizer are a heat stabilizer, an antioxidant (hindered phenol type: for example, ADEKA Corporation, trade name ADK STAB AO-50, and ADEKA Corporation having an isocyanuric ring. You may combine with the product name, Adecaptam AO-20). These additives can be appropriately combined in consideration of solubility in a solvent and heat resistance.

  Solvents include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone and cyclohexanone; esters such as ethyl acetate and butyl acetate; alcohols such as isopropyl alcohol and ethyl alcohol; benzene, toluene, xylene and methoxybenzene Aromatic hydrocarbons such as 1,2-dimethoxybenzene; phenols such as phenol and parachlorophenol; halogenated hydrocarbons such as chloroform, dichloromethane, dichloroethane, tetrachloroethane, trichloroethylene, tetrachloroethylene, and chlorobenzene It is done. These solvents can be used alone or in combination of two or more.

[4. Masking film)
As a material constituting the masking film, a resin is usually used. As such a resin, those having properties such as mechanical strength and thermal stability for protecting the hard coat film can be used. In particular, the polymer contained in the resin as the material constituting the masking film may be a homopolymer or a copolymer. Preferable examples include polyester polymers and polyolefin polymers. Examples of polyolefin polymers include polyethylene, polypropylene, ethylene-propylene copolymer, propylene-α-olefin copolymer, ethylene-α-olefin copolymer, ethylene-ethyl (meth) acrylate copolymer, ethylene. -Methyl (meth) acrylate copolymer, ethylene-n-butyl (meth) acrylate copolymer, ethylene-vinyl acetate copolymer, etc. are mentioned. Here, examples of the polyethylene include low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene. Examples of the ethylene-propylene copolymer include a random copolymer and a block copolymer. Furthermore, examples of the α-olefin include butene-1, hexene-1, 4-methylpentene-1, octene-1, pentene-1, and heptene-1. Among these, a resin film containing a polymer of polyethylene or polypropylene is particularly preferable.

  The resin constituting the masking film may contain an optional component in addition to the polymer described above. As an example of an arbitrary component, the thing similar to the arbitrary component of the base film described above is mentioned. As the optional component, one type may be used alone, or two or more types may be used in combination at any ratio. However, the resin constituting the masking film preferably contains about 50% to 100% or about 70% to 100% of a polymer as a main component of the resin.

  Although the thickness of a masking film is arbitrary, it is 5 micrometers or more normally, Usually, 500 micrometers or less, Preferably it is 300 micrometers or less, More preferably, it is 150 micrometers or less.

  The masking film can be obtained by appropriately selecting a resin such as those described above and appropriately forming the resin by a known film forming method.

[5. Any layer)
The laminate of the present invention may have an arbitrary layer in addition to the hard coat film and the masking film. For example, the masking film may be in direct contact with the hard coat film, but may be in contact with the pressure-sensitive adhesive layer.

  Examples of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer include urethane-based, (meth) acrylic-based, rubber-based, and silicone-based. More preferred is (meth) acrylic. Among them, the (meth) acrylic adhesive has strong adhesive strength and is excellent in transparency, weather resistance, heat resistance, solvent resistance and the like.

  When a laminated body has an adhesive layer, the thickness of an adhesive layer becomes like this. Preferably it is 5 micrometers or more, More preferably, it is 10 micrometers or more, On the other hand, Preferably it is 100 micrometers or less, More preferably, it is 50 micrometers or less. By appropriately selecting the material and thickness of the pressure-sensitive adhesive layer, desired physical properties such as peel strength can be easily obtained.

[6. Manufacturing method of laminate]
The laminate of the present invention can be produced by laminating a hard coat film and a masking film directly or via an adhesive layer. Preferably, both the hard coat film and the masking film have a long shape, and these can be efficiently manufactured by bonding them in the long direction.

[7. Properties of the laminate
In the laminate of the present invention, the peel strength F ₁ between the masking film and the hard coat layer is 0.01 N / 25 mm or more, preferably 0.02 N / 25 mm or more, while 0.15 N / 25 mm or less, preferably 1.0 N / 25 mm. When the laminate has a long shape and the peel strength over the entire length of the laminate is not uniform, the peel strength is within the range over the entire length of the laminate. According to the finding of the present inventor, in the case of a laminate using a combination of a hard coat film and a masking film, when the peel strength between the hard coat film and the masking film is in the specific range, the laminate Even after being stored as a wound body for a long period of time, the uniformity of the surface properties is high, and the occurrence of blocking and zipping can be suppressed.

[8. Winding body)
The wound body of the present invention is a wound body of the laminated body of the present invention that has a long shape and a length of 1000 m or more. Although the upper limit of the length of the laminated body in the wound body of the present invention is not particularly limited, it can be, for example, 6000 m or less. The width of the wound body is preferably 500 mm or more, more preferably 1000 mm or more, and preferably 2500 mm or less, more preferably 2000 mm or less.

  In the wound body of the present invention, the peel strength Fc between the masking film and the hard coat layer at the core portion and the peel strength Fo between the masking film and the hard coat layer for the outside of the winding satisfy a specific relationship. . Referring to the example of FIG. 1, the peel strengths Fc and Fo are peeled at the interface between the hard coat layer surface 112U on the masking film 120 side and the mask film 120 surface 120D on the hard coat layer side. It is strength.

  The peel strength Fc of the core part and the peel strength Fo for the outside of the winding are obtained when the laminate is unwound from the wound body and the masking film for the core and the outside of the laminate is peeled off from the hard coat layer. It is a value obtained by measuring the peel strength. In the present application, the core part of the wound body is a part of the laminated body at a position of 50 m from the end of the core when the wound body is formed, and the outer part is the wound body. Sometimes it is the part of the laminate at a position 5 m from the outer end of the winding.

  The peel strengths Fc and Fo satisfy the relationship of Fc / Fo <1.2. The upper limit value of Fc / Fo is preferably 1.15 or less, more preferably 1.10 or less. On the other hand, the lower limit value of Fc / Fo is preferably 0.8 or more, more preferably 0.9 or more. A wound body satisfying such a relationship of Fc / Fo can be preferably used as a material for a laminate. Such a wound body can be obtained by adopting the laminated body of the present invention that satisfies the above requirements as a laminated body, and appropriately selecting the material constituting the laminated body from the above examples as necessary. .

  In the wound body of the present invention, it is preferable that the contact angle with water on the surface of the hard coat layer side after peeling the masking film from the hard coat layer is in a specific range. Specifically, the contact angle is preferably 60 ° or more, more preferably 90 ° or more, while preferably 100 ° or less, more preferably 70 ° or less. When the contact angle over the entire length of the wound body is not uniform, the contact angle is preferably within the range over the entire length of the wound body.

  In the wound body of the present invention, the contact angle Ac (°) with the water on the surface of the hard coat layer side after the masking film is peeled off from the hard coat layer in the core part, and the masking in the unwind part It is preferable that the contact angle Ao (°) with water on the surface of the hard coat layer side after peeling the film from the hard coat layer satisfies the relationship of | Ac−Ao | <10. The value of | Ac−Ao | can be more preferably 5 or less. The lower limit of | Ac−Ao | can be 0 or more, for example.

  The contact angle is measured by placing a film on a contact angle meter (for example, manufactured by Kyowa Interface Science Co., Ltd.) so that the hard coat layer side is the measurement target surface, and 3.0 μL of water droplets on the hard coat layer side surface It is possible to measure by measuring the water contact angle after 3 seconds. A wound body in which the contact angle, the contact angle Ac of the winding core portion, and the contact angle Ao of the wound outer portion satisfy such conditions can be preferably used as a material of the laminate. Such a wound body can be obtained by adopting the laminated body of the present invention that satisfies the above requirements as a laminated body, and appropriately selecting the material constituting the laminated body from the above examples as necessary. .

  In the wound body of the present invention, the width of the masking film is narrower than the width of the hard coat film, and the hard coat film protrudes from the masking film at both ends in the width direction. The amount of protrusion of the coat film is preferably within a specific range.

  The amount of protrusion will be described with reference to FIG. FIG. 2 is a plan view schematically showing a state in which a part of the laminated body is unwound from the wound body of the present invention. In FIG. 2, the state which unwound the laminated body containing the hard-coat film 110 and the masking film 120 from the wound body 100R is shown. The width of masking film 120 (width indicated by arrow A2) is narrower than the width of hard coat film 110 (width indicated by arrow A1). The hard coat film 110 protrudes at both ends in the width direction of the laminate, and the amount of protrusion is indicated by A3R and A4L, respectively.

  The amount of protrusion of the hard coat film is preferably less than 7.5 mm, more preferably 5 mm or less, and preferably more than 0 mm, more preferably 1 mm or more, at the larger end of both ends in the width direction. The smaller amount of protrusion may be 0 mm or more and less than 7.5 mm. By having the amount of protrusion of the hard coat film in such a range, blocking of the laminate in the wound body can be suppressed, whereby the laminate is caught and laminated when the laminate is unwound from the wound body. Breakage of the body can be suppressed.

[9. (Use of laminate and wound body)
The wound body of the present invention and the laminate of the present invention can be used for the production of various optical members. For example, the laminate of the present invention unwound from the wound body of the present invention can be used for manufacturing a polarizing plate and a display device including the same. Specifically, the base film side surface of the laminate of the present invention is bonded to a polarizer, and a layer structure of (masking film) / (hard coat layer) / (base film) / (polarizer). The laminated body which has can be comprised. The masking film is peeled off from this laminate, and the hard coat layer is bonded to another member such as a glass plate. For example, a layer of (glass plate) / (hard coat layer) / (base film) / (polarizer) A stacked body having a structure can be formed, and the stacked body can be used as a component of a display device such as a liquid crystal display device or an organic electroluminescence display device.

Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the embodiments shown below, and can be implemented with any modifications without departing from the scope of the claims and their equivalents.
Unless otherwise specified, the operations described below were performed under normal temperature and normal pressure conditions.

〔Evaluation method〕
(Peel strength evaluation method)
The wound bodies obtained in Examples and Comparative Examples were stored for 6 hours immediately after production. Thereafter, the laminate was unwound from this wound body. A sample for evaluating unwinding peel strength and a sample for evaluating core peel strength were cut out from the wound laminate. The sample for evaluating the unwinding peel strength and the sample for evaluating the core peel strength were both in a strip shape of 25 mm × 100 mm. The sample for evaluating the core peel strength was cut out from a portion centered at a position of 50 m from the end of the core when it was a wound body. The sample for evaluating the unwinding peel strength was cut out from a portion centered at a position of 5 m from the outer end of the winding when it was a wound body.
The surface of the sample on the hard coat film side was fixed to a flat base. Measured when the masking film peels off from the fixed hard coat film by sandwiching the masking film at one end of the strip shape at the tip of the force gauge ("Digital Force Gauge" manufactured by IMADA). The magnitude of the force was measured. The same measurement was repeated three times, and the average value was taken as the peel strength value.
From the unwinding peel strength Fo obtained as a result of the measurement of the sample for unwinding peel strength evaluation and the core peel strength Fc obtained as a result of the measurement of the sample for core peel strength evaluation, the peel strength change rate Fc / Fo is obtained. Asked.

(Method for measuring film thickness)
The thickness of the film was measured using a contact-type film thickness meter (ABS Digimatic Indicator, manufactured by Mitutoyo Corporation).

(Measurement method of adhesive strength of adhesive)
The masking film was cut into a 20 mm × 300 m strip. A masking film was bonded to the SUS plate with a hand roller. When there was an adhesive layer, the adhesive layer was bonded to the SUS plate. The force measured when the masking film peels off when the masking film is peeled off 180 degrees from the fixed SUS plate with a masking film at one end in the shape of a strip sandwiched between the tips of a force gauge ("Digital Force Gauge" manufactured by IMADA) The size of was measured.

(Measurement method of contact angle)
The wound bodies obtained in Examples and Comparative Examples were stored for 6 hours immediately after production. Thereafter, the laminate was unwound from this wound body. From the unwound laminate, a sample for evaluating the outside contact angle and a sample for evaluating the core contact angle were cut out. The sample for evaluating the contact angle outside the roll is a residual hard coat film obtained by cutting out from a portion centered at a position of 50 m from the end of the roll when it is a wound body and peeling off the masking film. The sample for evaluating the contact angle of the core is a residual hard coat film obtained by cutting out a portion centered at a position of 5 m from the end of the core when the wound body is formed, and peeling off the masking film.
The sample for contact angle evaluation was placed flat on a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd.) so that the hard coat layer side would be the measurement target surface. A 3.0 μl water droplet was dropped on the surface of the hard coat layer side, and the water contact angle after 3 seconds was measured. Ten points were measured and the average value was taken as the contact angle value.
The contact angle difference Ac-Ao was determined from the unwinding contact angle Ao obtained as a result of the measurement of the unwinding contact angle evaluation sample and the winding contact angle Ac obtained as a result of the measurement of the winding contact angle evaluation sample.

(Excess amount)
The laminated body was pulled out from the long rolls obtained in the examples and comparative examples, and the width of protrusion of the hard coat film at both ends in the width direction was measured. However, when the masking film protruded from the hard coat film, the width was recorded as a negative value. The value with the larger absolute value of the protrusion width was recorded as the protrusion amount.

(Zipping evaluation method)
The laminated body was pulled out from the long wound body obtained in Examples and Comparative Examples, and the masking film was peeled off. The hard coat film surface before and after peeling was visually observed. Furthermore, the obtained hard coat film is bonded to a polarizing plate (HLC2-5618S (manufactured by Sanlitz)) to form a laminate having a layer configuration of (hard coat layer) / (base film) / (polarizing plate). The surface on the hard coat layer side was again visually observed. The state of streak-like zipping marks was evaluated according to the following evaluation criteria.
A: No zipping trace, not visible even when pasted with polarizing plate B: Although there is a zipping trace, not visible when pasted with polarizing plate C: There is a zipping trace, visible even when pasted with a polarizing plate

(Blocking evaluation method)
The laminated body was pulled out from the long wound body obtained in the examples and comparative examples, and wound around another core. When pulling out the laminate, it is visually determined whether the laminate is caught at the end of the laminate in the width direction. When there was no catch, it was evaluated as A, when there was catch, B, and when the laminate was broken, it was evaluated as C.

[Example 1]
(1-1. Hard coat composition)
To 100 parts of an acrylate monomer (made by DIC) containing an acryloyl group having three or more functional groups, a silicon dioxide dispersion (a dispersion having a solid content of 40% by weight using methyl ethyl ketone as a dispersion medium, manufactured by Nissan Chemical Industries, Ltd., number average) (Particle size 10 nm) in solid content 10 parts, photopolymerization initiator (Irgacure 184) 3 parts and leveling agent (DIC) 0.002 parts, and methyl ethyl ketone as a solvent to a solid content concentration of 40% In addition, a hard coat composition was obtained by stirring at 500 rpm for 30 minutes using a stirrer.

(1-2. Production of hard coat film)
As a base film, a resin film (trade name “ZEONOR FILM”, manufactured by Nippon Zeon Co., Ltd.) having a thickness of 25 μm containing an alicyclic structure-containing polymer was prepared. The base film was subjected to corona treatment (output 0.4 kW, discharge amount 200 W · min / m ² ). The hard coat composition produced in (1-1) was applied to the surface subjected to the corona treatment using a die coater so that the thickness of the hard coat layer obtained after curing was 1.7 μm, and the composition A film of material was formed.
Then, after drying the film | membrane of this composition for 2 minutes at 60 degreeC, the hard coat layer is formed by irradiating and hardening | curing light of 250 mJ / cm < ² > with a high pressure mercury lamp, and a base film and a hard coat A hard coat film with a layer was obtained. The hard coat film was a long film having a width of 1300 mm.

(1-3. Masking film)
As a masking film, a long polyethylene film (thickness 30 μm, no adhesive layer, adhesive strength 0.02 N / 20 mm) was prepared. The masking film was a long film having a width slightly narrower than 1300 mm.

(1-4. Pasting and winding)
The masking film of (1-3) and the hard coat film obtained in (1-2) were bonded together to obtain a hard coat film / masking film laminate. The bonding is performed by aligning the longitudinal direction of the masking film and the hard coat film, and in both the width direction ends, the end of the hard coat film protrudes longer than the end of the masking film, and the hard coat film The hard coat layer was in contact with the masking film. The laminate was wound up at a winding tension of 250 N to obtain a long wound body having a width of 1300 mm and a length of 1000 m.

(1-5. Evaluation)
About the wound body obtained by (1-4), unwinding peeling strength, winding core peeling strength, unwinding contact angle, winding core contact angle, zipping, and blocking were evaluated. Further, the protrusions at both ends in the width direction and the protrusion amount (the value of the width with the larger absolute value of the protrusion width) were measured and recorded. With the masking film surface facing upward, the right side and the left side when the unwinding source was observed from the unwinding tip side were judged to be right and left, respectively.

[Example 2]
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
-The base film was changed to the product name "Zeonor Film" (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 100 µm.
Moreover, the dimension of the width | variety of a masking film has some differences in Examples 1-14 and Comparative Examples 1-3, and, as a result of the operation of pasting, some shrinkage may occur in the dimension of the width direction. there were. Therefore, the width of the protrusion was different as shown in Tables 1 to 3.

Example 3
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
-The application | coating thickness of the hard-coat composition was changed and the thickness of the hard-coat layer obtained after hardening was 10 micrometers.

Example 4
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
As the masking film, a film having a narrower width than that used in Example 1 was used.

Example 5
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
A masking film having a width wider than that used in Example 1 and slightly wider than the hard coat film was used.

Example 6
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The base film was changed to a polyethylene terephthalate (PET) film having a thickness of 100 μm.

Example 7
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene terephthalate film (thickness 50 μm, having an acrylic pressure-sensitive adhesive as the pressure-sensitive adhesive layer, pressure-sensitive adhesive strength 0.06 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

Example 8
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene terephthalate film (thickness 56 μm, having an acrylic adhesive as the adhesive layer, and adhesive strength 0.07 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

Example 9
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene terephthalate film (thickness 140 μm, having an acrylic adhesive as an adhesive layer, and an adhesive strength of 0.03 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

Example 10
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene film (thickness 60 μm, having an acrylic pressure-sensitive adhesive as an adhesive layer, and adhesive strength 0.06 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

Example 11
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene (PE) film (thickness 60 μm, having an acrylic adhesive as the adhesive layer, and an adhesive strength of 0.10 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

Example 12
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyolefin (PO) film (thickness 45 μm, having an acrylic adhesive as the adhesive layer, and adhesive strength 0.05 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

Example 13
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene film (thickness 63 μm, having a rubber-based adhesive as the adhesive layer, adhesive strength 0.06 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

Example 14
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene film (thickness 140 μm, having an acrylic adhesive as the adhesive layer, and adhesive strength 0.04 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

[Comparative Example 1]
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene film (thickness 63 μm, having an acrylic pressure-sensitive adhesive as the pressure-sensitive adhesive layer, pressure-sensitive adhesive strength 0.05 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

[Comparative Example 2]
Except for the following, a long wound body was produced and evaluated in the same manner as in Example 1.
The masking film was changed to a polyethylene film (thickness 38 μm, having a rubber-based adhesive as an adhesive layer, and an adhesive strength of 3.0 N / 20 mm). The bonding was performed so that the adhesive layer of the masking film was in contact with the hard coat film.

  The results of Examples and Comparative Examples are shown in Tables 1 to 3.

  From the results of Examples and Comparative Examples, it is understood that the wound body of the present invention in which the laminated body of the present invention is wound can be a good wound body in which undesirable phenomena such as zipping and blocking are suppressed. .

DESCRIPTION OF SYMBOLS 100: Laminate 110: Hard coat film 111: Base film 112: Hard coat layer 112U: The surface of the hard coat layer on the masking film side 120: Masking film 120D: The surface of the masking film on the hard coat layer side 100R: Winding Round A3R, A4L: Amount of protrusion

Claims (6)

A hard coat film comprising a base film, and a hard coat layer provided on at least one side of the base film;
And a masking film bonded to the surface of the hard coat film on the hard coat layer side,
The peel strength _{F 1} between the masking film and the hard coat layer is 0.01~0.15N / 25mm, laminate.   The laminate according to claim 1, wherein the base film is a resin film containing an alicyclic structure-containing polymer, and the thickness of the base film is 50 μm or less.   The laminate according to claim 1 or 2, wherein the masking film is a resin film containing polyester or polyolefin.   The laminated body according to any one of claims 1 to 3, wherein the laminated body has a long shape and has a length of 1000 m or more, and the masking film and the hard at the core portion. A wound body in which the peel strength Fc between the coat layer and the peel strength Fo between the masking film and the hard coat layer for the outside of the roll satisfy a relationship of Fc / Fo <1.2.   The surface of the hard coat layer side after peeling the masking film from the hard coat layer has a contact angle with water of 60 ° to 100 °, and the masking film in the core portion is the hard coat layer. Contact angle Ac (°) with water on the surface of the hard coat layer side after peeling from the surface, and the surface on the hard coat layer side after peeling the masking film from the hard coat layer in the unwinding portion The wound body according to claim 4, wherein a contact angle Ao (°) with water satisfies a relationship of | Ac−Ao | <10. The width of the masking film is narrower than the width of the hard coat film, and the hard coat film protrudes from the masking film at both ends in the width direction, and the hard coat film protrudes at both ends in the width direction. Of the amount, the larger amount of protrusion is more than 0 and less than 7.5 mm,
The wound body according to claim 4 or 5.

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