JP2015150818A - Roll-like object of multilayer film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll-like object of a multilayer film, which is obtained at a comparatively low cost while allowing existence of a high hem and has such an excellent wound figure that there are no failures such as winding deviations and wrinkles.SOLUTION: The roll-like object of the multilayer film is obtained by forming a coating layer A on one surface of a base material film and forming another coating layer B on the other surface of the base material film. The thicknesses of both ends of each of the coating layer A and the coating layer B in the width direction are made larger than that of the central part thereof. The maximum thickness positions at both ends of the coating layer B in the width direction are deviated respectively by 1 mm or more in the width direction from those at both ends of the coating layer A in the width direction.

Description

  The present invention relates to a roll of a laminated film in which coating layers are provided on both surfaces of a base film, and more specifically, a roll of a laminated film having a good winding shape (no problems such as winding slip and wrinkles). About.

  It is known that a laminated film (for example, a hard coat film) in which a coating layer (for example, a hard coat layer) is provided on both surfaces of a base film is used as a base film for an optical film for display or a transparent conductive film for a touch panel, for example. (Patent Documents 1 to 8).

  A coating layer such as a hard coat layer is generally applied by a wet coating method, and is applied with a coating width smaller than that of the base film in order to prevent the coating liquid from flowing around to the back side of the base film. ing. That is, it is applied so that an uncoated portion of the coated layer is formed on the outer sides of both end portions in the width direction of the base film.

JP 2005-209431 A JP 2010-188540 A JP 2011-39978 A JP2011-65937A JP 2011-68064 A JP 2011-145593 A JP 2011-175040 A JP 2011-201087 A

  However, in such a coating method in which uncoated portions are provided outside both end portions of the base film, depending on the composition and physical properties (surface tension) of the coating solution or the type of the base film, the end of the coating layer ( The so-called “ear height” may occur.

  In general, a laminated film is manufactured by continuously applying a coating layer on a long base film and winding it into a roll through a drying process or the like. When rolls of laminated films manufactured using a coating method in which an uncoated part is provided), when an ear height occurs, stress concentrates on the ear high part, and winding rolls and wrinkles appear on the wound roll. It can cause inconvenient problems to occur.

  And the problem of the ear height in the roll-shaped thing of a laminated | multilayer film becomes remarkable when an application layer is laminated | stacked on both surfaces of a base film. That is, when laminating a coating layer on both sides of a base film, a method of applying one side at a time with one coating device is generally adopted, and the position of the coating layer on both sides in this coating method is usually the same position. Therefore, the above-mentioned problem is increased by overlapping the positions of the ear heights at the ends of the coating layers on both sides.

  Attempts have been made to suppress such an ear height from the surface of the coating device. However, depending on the type (composition and physical properties) of the coating liquid, the coating thickness, and the type of the base film, there are problems such as that a sufficient effect cannot be obtained, or the cost associated with the introduction of a new coating apparatus.

  On the other hand, the coating layer laminated | stacked on a base film may be designed so that a water contact angle may become comparatively low. By making the water contact angle of the coating layer relatively low, the coating property and adhesion when further coating another coating layer or laminating the adhesive layer on this coating layer is improved. However, a coating layer having a low water contact angle (a coating layer formed using a coating solution having a relatively high surface tension) is likely to have a high ear height, and the above problems (rolling and wrinkling occur on the roll-like material). Problem) is prominent.

  Accordingly, an object of the present invention is to provide a roll of a laminated film having a relatively low cost while allowing the presence of an ear height and having a good winding shape (no occurrence of winding deviation, wrinkles, etc.). .

The above object of the present invention has been achieved by the following invention.
[1]
It is a roll-shaped product in which a coating film A is laminated on one surface of a base film, and a laminated film in which a coating layer B is laminated on the other surface of the base film is wound up,
The thickness of both end portions in the film width direction of the coating layer A of the laminated film is larger than the thickness of the central portion in the film width direction of the coating layer A,
The thickness of both ends in the film width direction of the coating layer B of the laminated film is larger than the thickness of the central part in the film width direction of the coating layer B,
At one end in the film width direction of the coating layer A of the laminated film, the position A1 in the width direction of the laminated film, where the thickness of the coating layer A shows the maximum value,
The absolute value D1 (D1 = | A1-B1 |) of the difference from the position B1 in the width direction of the laminated film in which the thickness of the coating layer B shows the maximum value at the end in the film width direction of the coating layer B corresponding thereto. Is 1 mm or more,
At the other end in the film width direction of the coating layer A of the laminated film, the position A2 in the width direction of the laminated film, where the coating layer A shows the maximum thickness,
The absolute value D2 (D2 = | A2-B2 |) of the difference from the position B2 in the width direction of the laminated film in which the thickness of the coating layer B shows the maximum value at the end in the film width direction of the coating layer B corresponding thereto. Is a roll of laminated film having a thickness of 1 mm or more.
[2] The laminated film roll according to [1], wherein the thickness of the base film is 200 μm or less and the roll length of the laminated film is 300 m or more.
[3] The roll-like product of the laminated film according to [1] or [2], wherein the contact angles of the coating layer A and the coating layer B with water are each 75 degrees or less.
[4] The roll of the laminated film according to any one of [1] to [3], wherein each of the coating layer A and the coating layer B is a hard coat layer.

  ADVANTAGE OF THE INVENTION According to this invention, the roll-shaped thing of a laminated | multilayer film with a favorable winding form without defects, such as winding slip and a wrinkle, can be provided at comparatively low cost. In particular, the present invention is effective when the water contact angles of the coating layers laminated on both surfaces of the base film are each 75 degrees or less.

FIG. 1 is a schematic cross-sectional view in the width direction of one embodiment of a laminated film constituting the roll-like material of the present invention. FIG. 2 is a schematic cross-sectional view in the width direction of the laminated film for explaining the positional relationship such as A1, A2, D1, B1, B2, and D2. FIG. 3 is a schematic cross-sectional view in the width direction of another embodiment of the laminated film constituting the roll of the present invention. FIG. 4 is a schematic cross-sectional view in the width direction of the laminated film for explaining the measurement position in the film width direction when the average thickness of the coating layers A and B is determined.

  The present invention is a roll-shaped product obtained by winding a laminated film in which the coating layer A is laminated on one surface of the substrate film and the coating layer B is laminated on the other surface of the substrate film.

  FIG. 1 is a schematic cross-sectional view in the width direction of a laminated film that constitutes a roll-like product of the present invention and is provided with a coating layer on both sides of a base film. The coating layer A is provided on one surface of the base film 1, and the coating layer B is provided on the other surface of the base film (in addition, “A” and “B” of the coating layer A and the coating layer B). (Also doubles as (A) and (B) in FIG. 1 and FIGS. 2 and 3 described later). In both the coating layer A and the coating layer B, the thickness at both end portions in the width direction is larger than the thickness at the central portion (hereinafter, this phenomenon may be referred to as “ear height”).

  The coating width L1 of the coating layer A and the coating width L2 of the coating layer B are smaller than the width L of the base film, and uncoated portions 2a and 3a are generally formed at both ends of the coating layer A. The uncoated portions 2b and 3b are formed at both ends of the coated layer B.

  Here, in the present invention, the maximum thickness positions (B1, B2) at both ends of the coating layer B are shifted by 1 mm or more in the width direction with respect to the maximum thickness positions (A1, A2) at both ends of the coating layer A. It is characterized by that. That is, the shift width D1 of the maximum thickness position B1 of the coating layer B with respect to the maximum thickness position A1 of one end portion of the coating layer A and the maximum thickness of the coating layer B with respect to the maximum thickness position A2 of the other end portion of the coating layer A. The deviation width D2 of the position B2 is 1 mm or more, respectively.

  In other words, in the present invention, at one end portion in the film width direction of the coating layer A of the laminated film, the thickness of the coating layer A is the maximum value A1 in the width direction of the laminated film, corresponding to the end portion. The absolute value D1 of the difference between A1 and B1 (D1 = D1 = D1 = B1) when the thickness of the coating layer B is the position B1 in the width direction of the laminated film at the end of the coating layer B in the film width direction. It is important that | A1-B1 |) is 1 mm or more (hereinafter, D1 may be referred to as “deviation width D1” or the like).

  Similarly, at the other end portion in the film width direction of the coating layer A of the laminated film, the coating layer A has the maximum thickness, which is a position A2 in the width direction of the laminated film, and the coating layer B corresponding to the end portion. The absolute value D2 (D2 = | A2−B2 |) of the difference between A2 and B2 when the thickness B of the laminated film is the position B2 in the width direction of the laminated film at the end in the film width direction. ) Is 1 mm or more (hereinafter, D2 may be referred to as “deviation width D2” or the like).

  In the present invention, the “end portion” of the coating layers A and B refers to a region extending from the end in the width direction of the coating layers A and B to 20 mm inside. In the coating layers A and B, the “central portion” refers to a coating region other than the end portion.

  FIG. 2 illustrates the relationship between the “end”, “end”, “center”, A1, B1, D1, A2, B2, and D2 of the coating layers A and B.

  In the present invention, the maximum thickness positions (B1, B2) at both ends of the coating layer B are shifted by 1 mm or more from the maximum thickness positions (A1, A2) at both ends of the coating layer A. The roll shape of the roll is good (no winding slip and wrinkle). Hereinafter, the roll-like product of the laminated film may be simply abbreviated as “roll-like product”.

  The displacement width D1 and displacement width D2 of the maximum thickness position at both ends in the width direction of the coating layer A and the coating layer B are each preferably 2 mm or more, and more preferably 3 mm or more. The upper limit is preferably 20 mm or less, more preferably 15 mm or less, and particularly preferably 10 mm or less, from the viewpoint of the effective width of the final product (the width when the ear height portions at both ends of the coating layer A and the coating layer B are removed). preferable.

  As one mode for setting the shift width D1 and the shift width D2 to be 1 mm or more, for example, a mode in which the coating width of the coating layer A and the coating width of the coating layer B are made different.

  FIG. 1 shows an example in which the coating width L2 of the coating layer B is made smaller than the coating width L1 of the coating layer A. Here, the coating width L2 of the coating layer B with respect to the coating width L1 of the coating layer A is such that the positions of both ends of the coating layer B in the width direction are shifted inward with respect to the positions of both ends of the coating layer A in the width direction. It is adjusted to be smaller. The standard of the shift amounts d1 and d2 is 1 mm or more (preferably 2 mm or more, more preferably 3 mm or more).

  As another mode for setting the above-described deviation widths D1 and D2 to 1 mm or more, for example, the coating widths of the coating layer A and the coating layer B are substantially the same, and the center positions in the width direction of the coating layer A and the coating layer B are shifted. An embodiment is mentioned.

  FIG. 3 shows an example in which the coating width L1 of the coating layer A and the coating width L2 of the coating layer B are substantially the same, and the position of the width direction center 4b of the coating layer B is shifted from the width direction center 4a of the coating layer A. is there. The standard of the shift amount between the width direction centers 4a and 4b is 1 mm or more (preferably 2 mm or more, more preferably 3 mm or more).

  Moreover, in this invention, the thickness of the film width direction both ends of the coating layer A of a laminated film is larger than the thickness of the film width direction center part of the coating layer A, and the film width direction both ends of the coating layer B of a laminated film It is important that the thickness of the coating layer is larger than the thickness of the central portion of the coating layer B in the film width direction.

  That is, in the laminated film constituting the roll-like product of the present invention, both the coating layer A and the coating layer B have a thickness at both end portions in the width direction larger than the thickness of the central portion (that is, the coating layer A and the coating layer B). Both ear heights exist).

  Here, the thickness at both ends in the width direction means the maximum thickness at each end, and the maximum thickness at both ends is larger than the thickness at the center. The average thickness at the center is 100%. This means that the maximum thickness at both ends in the width direction is 110% or more.

  Furthermore, the present invention effectively enjoys the effects of the present invention when the maximum thickness at both ends in the width direction is 120% or more with respect to the average thickness of 100% at the center (when the ear height is relatively large). be able to.

  The upper limit of the maximum thickness at both ends in the width direction is preferably 300% or less, more preferably 250% or less, and particularly preferably 200% or less with respect to the average thickness of 100% at the center. When the maximum thickness at both end portions in the width direction exceeds 300% with respect to the average thickness of 100% at the center portion, winding rolls and wrinkles are likely to enter the roll.

  The average thickness in the center in the width direction of the coating layer A and the coating layer B means the average thickness of the region excluding both ends of the coating width (specifically, the entire region 20 mm inside from both ends). The average thickness is a value obtained by measuring the thickness at the center position in the width direction of each of the five areas formed by dividing the central region defined above into five equal parts in the width direction. FIG. 4 illustrates the positions measured when determining the average thickness.

  Thus, the roll-like product of the present invention is a roll-like product of a laminated film in which the coating layer A is laminated on one surface of the base film and the coating layer B is laminated on the other surface of the base film. Thus, both the coating layer A and the coating layer B have thicknesses at both ends in the width direction larger than the thickness at the center, and both ends in the width direction of the coating layer B with respect to the maximum thickness position at both ends in the width direction of the coating layer A. It is important that the maximum thickness position of each part is shifted by 1 mm or more in the width direction.

  The thickness of coating layer A and coating layer B (average thickness at the center in the width direction) is preferably in the range of 0.1 to 30 μm. If it is out of this range, the effect of the present invention (the effect that a laminated film roll having a good winding shape can be obtained while allowing the presence of the ear height) may not be fully enjoyed. From the above viewpoint, the thickness of the coating layer A and the coating layer B (average thickness in the central portion in the width direction) is preferably in the range of 0.5 to 20 μm, more preferably in the range of 0.8 to 10 μm, and 1 to 5 μm. The range of is particularly preferable.

  The coating width of the coating layer A and the coating layer B is generally in the range of 50 to 3000 mm, but from the viewpoint of production efficiency, the coating width is preferably as large as possible, specifically 1000 mm or more, more preferably 1100 mm or more, 1200 mm or more is particularly preferable. The upper limit is preferably 2500 mm or less, and more preferably 2000 mm or less from the viewpoint of ensuring uniform coatability.

  The width | variety of a base film is a length required in order that an uncoated part may be formed in the outer side of the width direction both ends of the coating layer A and the coating layer B, respectively. The length of one unapplied portion is set to a length necessary for preventing the coating liquid from flowing around to the back side of the base film when coating the coating layer A and the coating layer B. The range of 1-20 mm is suitable for the length of one uncoated part.

  The roll length of the roll is appropriately set depending on the thickness of the base film, the winding ability of the production apparatus, the use of the laminated film, and the like, but is generally in the range of 100 to 20000 m. The greater the roll length of the roll-like product, the higher the production efficiency. The greater the roll length of the roll-like product (the greater the overlap between the coating layer A and the coating layer B), the greater the effect of the present invention. In this respect, the winding length of the roll-like material is preferably 300 m or more, more preferably 500 m or more, further preferably 1000 m or more, and particularly preferably 2000 m or more. The upper limit is preferably 20000 m or less, and more preferably 10,000 m or less.

  Although the thickness of the base film varies depending on the use of the laminated film, etc., it is used for hard coat films, optical films (antireflection films, antiglare films, Newton ring prevention films, etc.), transparent conductive film base films, etc. The thickness of the base film to be obtained is generally in the range of 20 to 300 μm.

  From the viewpoint that the production efficiency is improved as the roll length of the roll-shaped material is increased and the effects of the present invention can be enjoyed more, the thickness of the base film is preferably smaller. As the thickness of the base film is smaller, the winding length can be increased while suppressing the weight of the roll-like material from increasing. Therefore, specifically, the thickness of the base film is preferably 200 μm or less, more preferably 150 μm or less, and particularly preferably 130 μm or less. The lower limit thickness is preferably 20 μm or more.

  In this invention, it is especially preferable that the thickness of a base film is 200 micrometers or less, and the winding length of the roll-shaped material of a laminated | multilayer film is 300 m or more.

[Coating layer A and coating layer B]
The laminated film constituting the roll of the present invention (or the laminated film obtained by rewinding the roll of the present invention) is a hard coat film, an optical film (antireflection film, antiglare film, Newton ring prevention film). Etc.), and is applied to uses such as a base film of a transparent conductive film for a touch panel. In this case, the coating layer A and the coating layer B are functional layers such as a hard coat layer, an antireflection layer, an antiglare layer, and a Newton ring prevention layer.

  Moreover, the laminated film which comprises the roll-shaped material of this invention is preferably applied to the base film of the transparent conductive film for touch panels. When the laminated film constituting the roll-like product of the present invention is applied to a base film, an optical adjustment layer (for example, a high refractive index layer or a low refractive index is provided on at least one surface of the coating layer A and the coating layer B of the laminated film. Layer) or an adhesive layer may be laminated.

  In the present invention, the water contact angle of the coating layer A and the coating layer B is preferably 75 degrees or less. When the water contact angle of the coating layer A and the coating layer B is 75 degrees or less, for example, as described above, another layer is laminated (coated) on the coating layer A and the coating layer B, or the adhesive layer is adhered. Applicability and adhesion when the layers are laminated are improved.

  However, a coating layer having a water contact angle of 75 degrees or less is likely to have an ear height. That is, the coating liquid for obtaining a coating layer having a water contact angle of 75 degrees or less does not contain any additive for reducing the surface tension such as a leveling agent, or the addition amount needs to be small. As a result, the surface tension of the coating liquid becomes high and the height of the ear tends to occur.

  The present invention is effective in an embodiment in which the above-described ear height is likely to occur, that is, when the water contact angle of the coating layer A and the coating layer B is 75 degrees or less.

  The water contact angle of the coating layer A and the coating layer B is further preferably 70 degrees or less, and particularly preferably 68 degrees or less. This further improves the coating properties and adhesion when another coating layer is further coated on the coating layer A and the coating layer B, or when the adhesive layer is laminated. The lower limit of the water contact angle is preferably 60 degrees or more from the viewpoint of ensuring good applicability.

  The coating layer A and the coating layer B having a water contact angle of 75 degrees or less are obtained by not containing an additive for reducing the surface tension such as a leveling agent or by adjusting the addition amount in a small range. It is done. In the present invention, it is preferable that no additive for reducing the surface tension such as a leveling agent is contained. However, when this additive is contained, the total solid content of the coating layer A and the coating layer B is 100% by mass. Is preferably 1% by mass or less, more preferably 0.5% by mass or less, and particularly preferably 0.1% by mass or less.

  The laminated film constituting the roll of the present invention is particularly preferably applied to a hard coat film. That is, the coating layer A and the coating layer B are preferably hard coat layers. The thickness of the hard coat layer is within the range (preferably in the range of 0.5 to 20 μm, more preferably in the range of 0.8 to 10 μm) of the thickness of the coating layer A and the coating layer B (average thickness in the central portion in the width direction). Since it is often designed particularly preferably in the range of 1 to 5 μm, as described above, the effect of the present invention (the effect that a laminated film roll having a good winding shape can be obtained while allowing the presence of an ear height) is obtained. ) Can be enjoyed effectively.

  Hereinafter, the coating layer A and the coating layer B will be described by taking a hard coat layer as an example. Therefore, in the following description, the coating layer A, the coating layer B, and the hard coat layer are synonymous.

  The hard coat layer is preferably a thermosetting resin layer or an active energy ray curable resin layer, particularly an active energy ray curable resin layer, from the viewpoint of obtaining high hardness and good scratch resistance. preferable.

  Examples of the thermosetting resin include an acrylic resin, a polyester resin, a polyurethane resin, a polycarbonate resin, a polystyrene resin, a polyolefin resin, a fluorine resin, and a polyimide resin that are polymerized or crosslinked by heat. .

  The active energy ray-curable resin is a resin that is polymerized and cured by active energy rays such as ultraviolet rays and electron beams, and the active energy ray-curable resin includes at least one ethylenically unsaturated group in the molecule. The compound (monomer and oligomer) which has. Here, examples of the ethylenically unsaturated group include acryloyl group, methacryloyl group, acryloyloxy group, methacryloyloxy group, allyl group, and vinyl group.

  In the following description, “... (Meth) acrylate” is a general term for “... Acrylate” and “.

  Examples of the compound having at least one ethylenically unsaturated group in the molecule include methyl (meth) acrylate, lauryl (meth) acrylate, ethyldiethylene glycol (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, methoxytriethylene glycol ( (Meth) acrylate, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) ) Acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipropylene glycol (Meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, glycerin propoxy Tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, di Pentaerythritol hexa (meth) acrylate, tripentaerythritol tri (meth) acrylate, tripenta Listylitol hexa (meth) acrylate, pentaerythritol tri (meth) acrylate hexamethylene diisocyanate urethane pre-oligomer, pentaerythritol tri (meth) acrylate-toluene diisocyanate urethane oligomer, pentaerythritol tri (meth) acrylate-isophorone diisocyanate urethane oligomer It is done.

  Moreover, what is marketed can be used as a polyfunctional urethane (meth) acrylate oligomer. For example, urethane acrylate AH series, urethane acrylate AT series, urethane acrylate AT series, urethane acrylate UA series manufactured by Kyoeisha Chemical Co., Ltd., UN-3320 series, UN-900 series manufactured by Negami Kogyo Co., Ltd., manufactured by Shin-Nakamura Chemical Co., Ltd. NK Oligo U series, Ebecryl 1290 series manufactured by Daicel UCB, and the like.

  As the active energy ray-curable resin, a compound having 2 or more ethylenically unsaturated groups in the molecule is preferable, and a compound having 3 or more ethylenically unsaturated groups in the molecule is preferably used.

  The content of the thermosetting resin or active energy ray-curable resin in the hard coat layer is preferably 30% by mass or more, more preferably 50% by mass or more, and more preferably 60% by mass with respect to 100% by mass of the solid content of the hard coat layer. % Or more is particularly preferable. The upper limit is preferably 98% by mass or less, and more preferably 95% by mass or less.

  The hard coat layer preferably further contains a photopolymerization initiator. Specific examples of such photopolymerization initiators include, for example, acetophenone, 2,2-diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone, benzophenone, 2-chlorobenzophenone, 4,4′-dichlorobenzophenone, 4,4′-bisdiethylaminobenzophenone, Michler's ketone, benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, methyl benzoylformate, p-isopropyl-α-hydroxyisobutylphenone, α-hydroxyisobutylphenone, 2, Carbonyl compounds such as 2-dimethoxy-2-phenylacetophenone and 1-hydroxycyclohexyl phenyl ketone, tetramethylthiuram monosulfide, teto Sulfur compounds such as lamethylthiuram disulfide, thioxanthone, 2-chlorothioxanthone, and 2-methylthioxanthone can be used. These photopolymerization initiators may be used alone or in combination of two or more.

Moreover, generally the photoinitiator is marketed and they can be used. For example,
Irgacure 184, Irgacure 907, Irgacure 379, Irgacure 127, Irgacure 127, Irgacure 500, Irgacure 250, Irgacure 1800, Irgacure 1870, Irgacure OXE01, DAROCURO Sipecure MBB, Speedcure PBZ, Speedcure ITX, Speedcure CTX, Speedcure EDB, Escure ONE, Esacure KIP150, Esacure KTO46, etc. CURE DMBI etc. are mentioned.

  The content of the photopolymerization initiator is suitably in the range of 0.1 to 10% by mass and preferably in the range of 0.5 to 8% by mass with respect to 100% by mass of the total solid content of the hard coat layer.

  In order to impart good slipperiness and blocking resistance to the laminated film (hard coat film), it is preferable that at least one of the hard coat layers contains particles.

  When the hard coat layer contains particles, the haze value of the laminated film (hard coat film) tends to increase and the transparency tends to decrease, but the thickness (T) of the hard coat layer containing particles, By using particles having a sufficiently small average particle diameter (D), an increase in haze value can be suppressed.

  That is, from the viewpoint of ensuring good slipping and blocking resistance while suppressing an increase in haze value, the average particle diameter (D) of the particles with respect to the thickness (T) [μm] of the hard coat layer containing the particles. [mu] m] (D / T) is preferably in the range of 0.01 to 0.5, more preferably in the range of 0.02 to 0.3, and particularly preferably in the range of 0.03 to 0.2.

  Specifically, the average particle diameter of the particles is preferably less than 0.5 μm, more preferably less than 0.4 μm, and particularly preferably less than 0.3 μm. The lower limit of the average particle diameter is preferably 0.03 μm or more, more preferably 0.04 μm or more, and particularly preferably 0.05 μm or more.

Organic particles or inorganic particles can be used as the particles. As the resin constituting the organic particles, an acrylic resin, a styrene resin, a polyester resin, a polyurethane resin, a polycarbonate resin, a polyamide resin, a silicone resin, a fluorine resin, or 2 used for the synthesis of the above resin. Examples thereof include copolymer resins of more than one type of monomer. Among these, acrylic resin particles are preferably used. As the inorganic particles, silica is preferable, and colloidal silica is particularly preferable.

  The content of the particles is preferably in the range of 3 to 30% by mass, more preferably in the range of 5 to 25% by mass, and particularly preferably in the range of 7 to 20% by mass with respect to 100% by mass of the total solid content of the hard coat layer. .

[Base film]
A plastic film is preferably used as the base film of the laminated film constituting the roll of the present invention. Examples of the resin constituting the plastic film include polyester resins such as polyethylene terephthalate and polyethylene naphthalate, cellulose resins such as triacetyl cellulose, polyolefin resins such as polyethylene, polypropylene, and polybutylene, acrylic resins, polycarbonate resins, arton resins, and epoxy resins. , Polyimide resin, polyetherimide resin, polyamide resin, polysulfone resin, polyphenylene sulfide resin, polyether sulfone resin, and the like. Among these, a polyester resin, a polyolefin resin, and a cellulose resin are preferable, and a polyester resin is particularly preferably used. Further, a laminated plastic film in which two or more layers made of the above resin are laminated may be used.

  The base film is a base film in which an easy-adhesion layer (primer layer) is laminated in advance on both sides of the base film in order to increase the adhesion strength (adhesion strength) between the coating layer A and the coating layer B. preferable. In particular, when the base film is a polyester film (polyethylene terephthalate film), it is preferable that an easy-adhesion layer is provided in advance on both sides thereof.

  When the easy adhesion layer is provided in the base film, it is preferable that the coating layer A and the coating layer B are directly laminated | stacked on the easy adhesion layer. In this embodiment, it is preferable that the wet tension of the easy-adhesion layer is relatively high because the size of the ear height of the coating layer A and the coating layer B is reduced. From this viewpoint, the wetting tension of the easy adhesion layer is preferably 40 mN / m or more, and particularly preferably 42 mN / m or more. The upper limit of the wetting tension of the easy-adhesion layer is not particularly limited, but is about 60 mN / m.

  As described above, when the water contact angle of the coating layer A and the coating layer B is 75 degrees or less, the ear height tends to be large, but the wetting tension of the easy-adhesion layer provided on both surfaces of the base film is high. Each of 40 mN / m or more (preferably 42 mN / m or more) is preferable because the ear height of the coating layer A and the coating layer B is reduced.

  The easy adhesion layer is preferably a layer containing a resin as a main component. That is, it is preferable that an easily bonding layer is a layer which contains 50 mass% or more of resin with respect to 100 mass% of solid content total amount of an easily bonding layer. The content of the resin in the easy adhesion layer is further preferably 60% by mass or more, more preferably 70% by mass or more, and particularly preferably 80% by mass or more. The upper limit is preferably 98% by mass or less, more preferably 95% by mass or less, and particularly preferably 90% by mass or less.

  Examples of the resin constituting the easy adhesion layer include polyester resin, acrylic resin, urethane resin, polycarbonate resin, epoxy resin, alkyd resin, urea resin, and the like. These resins can be used alone or in combination.

  From the viewpoint of controlling the wetting tension of the surface of the easy adhesion layer to 40 mN / m or more, and from the viewpoint of improving the adhesion between the base film, the coating layer A and the coating layer B, Is preferably at least one selected from the group consisting of polyester resins, acrylic resins and polyurethane resins.

  The easy-adhesion layer preferably further contains a crosslinking agent. The easy-adhesion layer is a layer comprising the above-described resin and a crosslinking agent, and is preferably a layer (thermosetting layer) cured by heat. By making the easy-adhesion layer such a thermosetting layer, the adhesion between the base film and the coating layer A and the coating layer B can be further improved. The conditions (heating temperature, time) for thermosetting the easy-adhesion layer are not particularly limited, but the heating temperature is preferably 70 ° C or higher, more preferably 100 ° C or higher, particularly preferably 150 ° C or higher, and most preferably 200 ° C or higher. preferable. The upper limit is preferably 300 ° C. or lower. The heating time is preferably in the range of 5 to 300 seconds, and more preferably in the range of 10 to 200 seconds.

  Examples of the crosslinking agent include melamine crosslinking agent, oxazoline crosslinking agent, carbodiimide crosslinking agent, isocyanate crosslinking agent, aziridine crosslinking agent, epoxy crosslinking agent, methylolated or alkylolized urea crosslinking agent, acrylamide Examples thereof include system crosslinking agents, polyamide resins, amide epoxy compounds, various silane coupling agents, and various titanate coupling agents. Among these, melamine crosslinking agents, oxazoline crosslinking agents, carbodiimide crosslinking agents, isocyanate crosslinking agents, aziridine crosslinking agents, and epoxy crosslinking agents are preferable, and melamine crosslinking agents are particularly preferable.

  The content of the crosslinking agent in the easy-adhesion layer is preferably in the range of 0.5 to 30% by mass, more preferably in the range of 1 to 25% by mass, especially 2 to 2% with respect to 100% by mass of the total solid content of the easy-adhesion layer. A range of 20% by weight is preferred.

  The wetting tension of the easy-adhesion layer can also be controlled by adjusting the type and content of the crosslinking agent described above. For example, when the content of the cross-linking agent increases, the wetting tension on the surface of the easy-adhesion layer tends to decrease. Conversely, when the content of the cross-linking agent decreases, the wetting tension on the surface of the easy-adhesion layer tends to increase.

  The easy-adhesion layer can further contain a surfactant. Examples of such surfactants include polyoxyethylene alkylphenyl ether, polyoxyethylene-fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester, fatty acid metal soap, alkyl sulfate, alkyl sulfonate, alkyl sulfosuccinate, Examples thereof include quaternary ammonium tallow salt, alkylamine hydrochloride, betaine type surfactant and the like.

  The content of the surfactant in the easy-adhesion layer is preferably in the range of 0.1 to 20% by mass and more preferably in the range of 0.5 to 15% by mass with respect to 100% by mass of the total solid content of the easy-adhesion layer.

  The easy-adhesion layer preferably contains particles from the viewpoint of ensuring appropriate slipperiness in the production process of the laminated film. The average particle diameter of such particles is preferably larger than the thickness of the easy-adhesion layer. Specifically, the average particle diameter of the particles is preferably 1.1 times or more and 1.3 times or more the thickness of the easy-adhesion layer. More preferably, 1.5 times or more is particularly preferable.

  The particles to be included in the easy-adhesion layer are not particularly limited, but inorganic particles such as silica, titanium oxide, aluminum oxide, zirconium oxide, calcium carbonate, zeolite, acrylic particles, silicone particles, polyimide particles, Teflon (registered trademark) particles Organic particles such as Among these, silica particles are preferable, and colloidal silica is particularly preferable.

  The thickness of the easy adhesion layer is preferably in the range of 10 to 200 nm, particularly preferably in the range of 15 to 150 nm.

[Production method of roll-like product]
Hereinafter, the manufacturing method of the roll-shaped thing of this invention is demonstrated.

  A roll-shaped object is normally performed by a roll-to-roll system. In the roll-to-roll method, a roll-shaped base film is continuously unwound and conveyed, and the coating layer A (and coating layer B) is applied, dried, and cured as necessary, and then rolled. This is a winding method.

  Application of the coating layer A and the coating layer B may be performed continuously in one production process, or may be performed separately in two production processes.

  For example, the coating layer A and the coating layer B are continuously applied in one production process. For example, a roll-shaped base film is continuously unwound, conveyed, and applied to one surface of the base film. There is a method in which the layer A is applied, dried, cured as necessary, and then the coating layer B is applied on the other surface of the base film, dried, cured as necessary, and then wound into a roll.

  For example, in the first production process, the coating layer A and the coating layer B are separately applied in two production steps. After applying the coating layer A on one side, drying, and curing as necessary, the roll A is wound up into a roll shape, and then the roll A is continuously unwound in the second production step. A method may be mentioned in which the coating layer B is applied to the other surface of the base film, dried, cured as necessary, and then wound into a roll. Here, the first production process and the second production process may use the same production line or different production lines.

  When the coating layer A and the coating layer B are hard coat layers, and the hard coat layer is an active energy ray-curable resin layer, in the production process described above, curing after coating and drying is performed using active energy rays (ultraviolet rays). Or electron beam irradiation. On the other hand, when the hard coat layer is a thermosetting resin layer, curing after coating and drying is performed by heating.

  Application of the coating layer A and the coating layer B is preferably performed by a wet coating method. Examples of the wet coating method include a reverse coating method, a spray coating method, a bar coating method, a gravure coating method, a rod coating method, a slit die coating method, a spin coating method, and an extrusion coating method. Among these coating methods, the gravure coating method and the slit die coating method are preferable, and the gravure coating method is particularly preferable from the viewpoint of uniformly coating a relatively thin coating layer.

  In the gravure coating method, the coating liquid supplied to the gravure roll is once held in cells (grooves) formed on the peripheral surface of the gravure roll, and then the gravure roll comes into contact with the substrate film that is continuously transported, and the coating liquid in the cell Is applied by being transferred to a substrate film.

  In the gravure coating method, the coating width of the coating layer A and the coating layer B can be adjusted by adjusting the cell (groove) area of the gravure roll to the coating width, or the gravure roll cell at both ends in the width direction of the base film. There is a method of installing a transfer prevention plate (transfer prevention film) between the base film and the gravure roll so that the coating liquid held in the (groove) is not transferred to the base film.

  Adjustment of the coating width of the coating layer A and the coating layer B in the slit die coating method can be performed by adjusting the slit width of the slit die to the coating width.

  Examples of the coating liquid for forming the coating layer A and the coating layer B include, for example, the above-described thermosetting resin or active energy ray-curable resin and other additives (particles, photopolymerization initiator, etc.) as appropriate organic materials. A solution dissolved or dispersed in a solvent may be mentioned.

  The solid content concentration of the coating solution is preferably in the range of 1 to 70% by mass, more preferably in the range of 2 to 60% by mass, and particularly preferably in the range of 3 to 50% by mass.

  The viscosity of the coating solution is preferably in the range of 1 to 50 mPa · s, more preferably in the range of 2 to 40 mPa · s, and particularly preferably in the range of 3 to 30 mPa · s from the viewpoint of ensuring good coatability.

[Laminated film]
The laminated film constituting the roll of the present invention is applied to uses such as a hard coat film, an optical film (antireflection film, antiglare film, Newton ring prevention film, etc.), a base film of a transparent conductive film, and the like.

  In particular, the laminated film constituting the roll of the present invention is preferably applied to a base film of a transparent conductive film for touch panel. When applied to the base film, an optical adjustment layer (for example, a high refractive index layer or a low refractive index layer) is further laminated on at least one surface of the coating layer A and the coating layer B of the laminated film, or an adhesive layer is formed. Or stacked. In this case, the coating layer A and the coating layer B are preferably hard coat layers.

  That is, the preferable aspect of the base film of the transparent conductive film for touch panels using the laminated film which comprises the roll-shaped material of this invention whose coating layer A and coating layer B are hard-coat layers is, for example, on coating layer A And a high refractive index layer having a refractive index of 1.60 to 1.80 and a thickness of 20 to 70 nm, and a low refractive index layer having a refractive index of 1.35 to 1.53 and a thickness of 20 to 70 nm. Are stacked in this order. Furthermore, the coating layer B is preferably an anti-blocking hard coat layer containing particles.

  Since the rolled form of this invention has a favorable winding form, it can be used for the production process of the base film of the transparent conductive film for touchscreens in that state. At this time, the coating width of the high refractive index layer and the low refractive index layer laminated on the coating layer A and the coating position with respect to the base film (positions at both ends) may be the same as the coating layer A. , May be different.

  Since the thicknesses of the high refractive index layer and the low refractive index layer are extremely thin as described above, the coating width of the coating layer A, the high refractive index layer and the low refractive index layer, and the coating region for the base film are the same. However, the rolled form of the base film does not deteriorate.

  In addition, since the roll of the base film of the transparent conductive film for a touch panel manufactured using the roll of the present invention has a good winding shape, the production process of the transparent conductive film for a touch panel (low It can be used for a transparent conductive film (step of laminating an ITO (tin oxide doped indium oxide) film) on the refractive index layer.

  Thus, since the rolled product of the present invention has a good winding shape, it can be transferred to the next step without going through a slit (cutting) step for removing the ear-high portion. Improvement is achieved.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by these Examples. In addition, the measuring method and evaluation method in a present Example are shown below.

(1) Measurement of average thickness of width direction center part of coating layer A and coating layer B Measurement is performed at the following measurement position A and measurement position B, and the measurement value at measurement position A and the measurement value at measurement position B are measured. From the average value, the average thickness of the central part in the width direction of the coating layer A and the coating layer B was determined.

  Measurement position A: In the longitudinal direction of the laminated film unwound from the roll, the winding start side (winding core side) end (longitudinal end) starts from the starting point and the winding end side (surface layer side) of the laminated film. The measurement position A was 5 m in the longitudinal direction.

  Measurement position B: In the longitudinal direction of the laminated film unwound from the roll, the winding end side (surface layer side) end (longitudinal end) starts from the start point of the laminated film (winding core side). The measurement position B was 5 m in the longitudinal direction.

  At the measurement position A, the width direction of each of the five areas formed by equally dividing the area in the center in the width direction of the coating layer A and the coating layer B (all areas 20 mm inside from both ends) into the width direction. Each thickness was measured from a TEM (transmission electron microscope) cross-sectional photograph at the center position (five places), and the averaged value was taken as the measurement value at the measurement position A.

  The cross-sectional photograph of a TEM (transmission electron microscope) is a cross section of a laminated film cut into ultrathin sections and observed with a TEM (transmission electron microscope) at an acceleration voltage of 100 kV (observed at a magnification of 1 to 300,000 times). , Obtained by shooting.

  At the measurement position B, the same measurement as that performed at the measurement position A was performed, and the measurement value at the measurement position B was obtained.

  The measurement value at the measurement position A and the measurement value at the measurement position B were averaged, and the average thickness at the center in the width direction of the coating layer A and the coating layer B was determined.

(2) Specification of the maximum thickness position of the width direction both ends of the coating layer A and the coating layer B and measurement of thickness Using a stylus type surface roughness measuring instrument SE-3400 (manufactured by Kosaka Laboratory Ltd.), ( At the measurement position A described in 1), the surface roughness profiles at both ends in the width direction of the coating layer A and the coating layer B are obtained, and the maximum thickness positions (A1, A2, A2, A2) at both ends in the width direction are determined from the surface roughness profiles. B1, B2) were identified.

  And D1 and D2 were calculated | required from obtained A1, A2, B1, and B2.

  Further, at each maximum thickness position (A1, A2, B1, B2), the maximum thickness was measured from a TEM (transmission electron microscope) cross-sectional photograph by the same method as (1) above.

  In addition, the same measurement was performed at the measurement position B described in (1).

  Then, the value of D1 obtained from the measurement at the measurement position A and the value of D1 obtained from the measurement at the measurement position B were averaged to obtain a final value of D1.

  Further, the value of D2 obtained from the measurement at the measurement position A and the value of D2 obtained from the measurement at the measurement position B were averaged to obtain a final value of D2.

  In addition, regarding the maximum thickness at the maximum thickness positions (A1, A2, B1, B2) at both ends of the coating layers A and B, the respective maximum thickness values obtained from the measurement at the measurement position A and the measurement position B Each of the maximum thickness values obtained from the measurement in (1) is averaged, and the final maximum thickness values at the maximum thickness positions (A1, A2, B1, B2) at both ends of the coating layers A and B are respectively determined. Obtained.

(3) Measurement of water contact angle of coating layer A and coating layer B Coating layer A was measured using an automatic contact angle meter (DM-500) manufactured by Kyowa Interface Science Co., Ltd. and analysis software FAMAS (version 3.34). And the water contact angle of the coating layer B was measured. Pure water was used for the measurement, and the dropping amount of pure water was 2 microliters. Measurement was performed 5 times, and an average value of 3 points excluding the maximum value and the minimum value was adopted. The measurement environment is a temperature of 23 ° C. and a relative humidity of 55%.

  The measurement is performed at the measurement position A and the measurement position B described in (1). From the average value of the measurement value at the measurement position A and the measurement value at the measurement position B, the water in the coating layer A and the coating layer B is measured. The contact angle was determined.

(4) Measurement of Wetting Tension of Easy Adhesive Layer A substrate film on which an easy adhesive layer is laminated is seasoned for 6 hours in an ordinary atmosphere (23 ° C., relative humidity 50%), and JIS-K- under the same atmosphere. 6768 (1999).

(5) cutting out a section of the measurement easy adhesion layer laminated base film of the thickness of the adhesive layer to the ultra-thin sections, RuO ₄ staining, OsO ₄ staining, or by both double staining with staining ultramicrotomy The thickness of the easy adhesion layer was measured from a TEM (transmission electron microscope) cross-sectional photograph. Five locations were measured, and the average value was taken as the thickness of the easy adhesion layer.
Measurement device: Transmission electron microscope (H-7100FA type, manufactured by Hitachi, Ltd.)
・ Measurement conditions: Acceleration voltage 100kV
-Sample preparation: frozen ultrathin section method-Magnification: 300,000 times.

(6) Measurement of average particle diameter of particles contained in coating layer B The section of the coating layer B was observed with a TEM (transmission electron microscope) (approximately 10,000 to 100,000 times), and the section photograph was randomly selected. The maximum length of each of the 30 selected particles was measured, and a value obtained by averaging them was taken as the average particle diameter of the particles.

(7) Measurement of average particle diameter of particles contained in easy-adhesion layer The surface of the easy-adhesion layer laminated on the base film was observed at a magnification of 10,000 times using a SEM (scanning electron microscope), and the particles The image (light intensity produced by the particles) is connected to an image analyzer (for example, QTM900 manufactured by Cambridge Instrument), the data is acquired by changing the observation location, and when the total number of particles reaches 5000 or more, the following numerical processing is performed. The number average diameter d determined thereby was defined as the average particle diameter (diameter).
・ D = Σdi / N
Here, di is the equivalent circular diameter of the particle (the diameter of a circle having the same area as the cross-sectional area of the particle), and N is the number.

(8) Evaluation of roll form of laminated film roll According to the following criteria, the roll form of laminated film was visually evaluated.
Good: No winding slip and wrinkle.
Defective; winding slip and wrinkle are generated.

[Example 1]
<Manufacture of easy adhesion layer laminated polyethylene terephthalate (PET) film>
PET pellets (intrinsic viscosity 0.63 dl / g) substantially free of externally added particles are sufficiently vacuum-dried, then supplied to an extruder, melted at 285 ° C., extruded from a T-shaped die into a sheet shape, It was wound around a mirror-casting drum having a surface temperature of 25 ° C. using an electric application casting method and cooled and solidified. This unstretched film was heated to 90 ° C. and stretched 3.4 times in the longitudinal direction to obtain a uniaxially stretched film. After performing corona discharge treatment in air on both surfaces of this uniaxially stretched film, the following easy-adhesion layer coating solution was applied to both surfaces of the uniaxially stretched film.

  Next, the uniaxially stretched film coated with the easy-adhesion layer coating liquid on both sides is held by clips and guided to a preheating zone, dried at an ambient temperature of 75 ° C., raised to 110 ° C. using a radiation heater, and again raised to 90 ° C. Then, the film was continuously stretched 3.5 times in the width direction in a heating zone at 120 ° C., subsequently heat-treated for 20 seconds in a heating zone at 220 ° C., and wound to produce a roll-shaped PET film. .

  The roll-like PET film had a thickness of 50 μm, a width of 1500 mm, and a winding length of 6000 m. Moreover, the thickness of the easily bonding layer laminated | stacked on both surfaces was 80 nm, respectively. The wetting tension of the easily adhesive layers on both sides was 42 mN / m, respectively.

<Easily adhesive layer coating solution>
A water-dispersed coating solution was prepared by mixing 27% by mass of polyester resin a, 54% by mass of polyester resin b, 18% by mass of melamine-based crosslinking agent, and 1% by mass of particles in terms of solid content mass ratio.
Polyester resin a: a polyester resin composed of 43 mol% of 2,6-naphthalenedicarboxylic acid / 5 mol% of 5-sodium sulfoisophthalic acid / 45 mol% of ethylene glycol / 5 mol% of diethylene glycol.
Polyester resin b: a polyester resin composed of terephthalic acid 38 mol% / trimellitic acid 12 mol% / ethylene glycol 45 mol% / diethylene glycol 5 mol%.
・ Melamine-based cross-linking agent; “Nicarac MW12LF” manufactured by Sanwa Chemical Co., Ltd.
Particles: colloidal silica having an average particle size of 0.19 μm.

<Manufacture of rolls of laminated film (hard coat film)>
A laminated film having a positional relationship between the width of the base film and the coating widths of the coating layer A and the coating layer B as shown in FIG. 1 was produced.

First, using the roll-shaped PET film produced above, a coating layer A (hard coat layer) was applied on one surface by a gravure coating method, dried with hot air at 90 ° C., and then irradiated with ultraviolet rays (integrated light amount 400 mJ / cm ² ) was irradiated and cured, and then rolled to obtain roll A.

Next, using the roll A, a coating layer B (hard coat layer) is applied by a gravure coating method on the surface opposite to the surface on which the coating layer A is laminated, and dried with hot air at 90 ° C. After being cured by irradiating with ultraviolet rays (integrated light amount 400 mJ / cm ² ), it was wound up to obtain a roll of laminated film.

  The coating liquid a for forming the coating layer A and the coating liquid b for forming the coating layer B are as follows.

<Coating liquid a>
50 parts by mass of dipentaerythritol hexaacrylate as an active energy ray-curable resin, 50 parts by mass of urethane acrylate oligomer (“Art Resin UN901T” manufactured by Negami Kogyo Co., Ltd.), photopolymerization initiator (Ciba Specialty Chemicals) 5 parts by mass of “Irgacure (registered trademark) 184” manufactured by Co., Ltd. was dissolved in an organic solvent (a mixed solvent of methyl ethyl ketone: cyclohexanone = 1: 1 (mass ratio)). The coating solution has a solid content concentration of 30% by mass and a viscosity of 5 mPa · s (23 ° C.).

<Coating liquid b>
92 parts by mass of dipentaerythritol hexaacrylate as an active energy ray-curable resin, and styrene-acrylic copolymer resin particles (trade name “STAPHYLOID EA-1135” manufactured by Ganz Kasei Co., Ltd.) as organic particles; average particle diameter 130 nm 8 parts by mass in terms of solid content and 5 parts by mass of a photopolymerization initiator (“Irgacure (registered trademark) 184” manufactured by Ciba Specialty Chemicals Co., Ltd.) are mixed with an organic solvent (ethyl acetate: toluene = 1: 1 (mass). The solvent was prepared by dissolving or dispersing in the mixed solvent). The coating solution has a solid content concentration of 30% by mass and a viscosity of 5 mPa · s (23 ° C.).

  The roll of the laminated film produced as described above has a base film (PET film) width (L) of 1300 mm, a coating layer A coating width (L1) of 1290 mm, and a coating layer B coating width ( L2) was 1280 mm, the outer uncoated portions (2a, 3a) at both ends in the width direction of the coating layer A were 5 mm each, and the outer uncoated portions (2b, 3b) at both ends in the width direction of the coating layer B were 10 mm. It was. The roll length of the roll of the laminated film was 5500 m.

[Comparative Example 1]
A laminated film in the same manner as in Example 1 except that the coating width of the coating layer A and the coating layer B and the uncoated portions outside the both ends of the coating layer A and the coating layer B are changed as follows. A rolled product was produced.

  The coating width (L1, L2) of the coating layer A and the coating layer B is the same (1280 mm), and the uncoated portions (2a, 3a, 2b, 3b) outside both ends of the coating layer A and the coating layer B are all It apply | coated so that it might become 10 mm.

[Evaluation]
Tables 1 and 2 show the results of measurement and evaluation of the laminated films and rolls obtained in Example 1 and Comparative Example 1.

  The laminated film constituting the roll-like material of Example 1 of the present invention has the maximum thickness positions (B1, B2) at both ends in the width direction of the coating layer B with respect to the maximum thickness positions (A1, A2) at both ends in the width direction of the coating layer A. The deviation width (D1, D2) of B2) was 5 mm (1 mm or more), respectively, and the rolled form was good.

  On the other hand, since the deviation widths (D1, D2) of Comparative Example 1 were all 0 mm, the rolled form of the roll-shaped product was poor.

DESCRIPTION OF SYMBOLS 1 Base film 2a, 3a The uncoated part 2b, 3b of the outer side of the width direction both ends of the coating layer A 2b The uncoated part of the outer side of the width direction both ends of the coating layer A 4a The width direction center of the coating layer A 4b Center of direction A Coating layer A
B Coating layer B
A1 Maximum thickness position at one end in the width direction of the coating layer A A2 Maximum thickness position at the other end in the width direction of the coating layer A B1 Maximum thickness position at one end in the width direction of the coating layer B (A1 The maximum thickness position at the end of the coating layer B in the width direction)
B2 Maximum thickness position at the other end in the width direction of the coating layer B (maximum thickness position at the end in the width direction of the coating layer B corresponding to A2)
CA Central portion in the width direction of the coating layer A CB Central portion in the width direction of the coating layer B EA1 One end in the width direction of the coating layer A EA2 The other end in the width direction of the coating layer A EB1 In the width direction of the coating layer B One end EB2 The other end in the width direction of the coating layer B D1 The maximum of the end in the width direction of the coating layer B corresponding to the end relative to the maximum thickness position A1 of one end in the width direction of the coating layer A Deviation width of thickness position B1 (absolute value of difference between A1 and B1)
D2 Deviation width of the maximum thickness position B2 of the end portion in the width direction of the coating layer B corresponding to the end portion with respect to the maximum thickness position A2 of the other end portion in the width direction of the application layer A (the difference between A2 and B2 Absolute value)
L Width of base film L1 Width of coating layer A L2 Width of coating layer B RA1 One end in the width direction of coating layer A RA2 The other end in the width direction of coating layer A RB1 Width of coating layer B One end in the direction (the end in the width direction of the coating layer B corresponding to RA1)
RB2 The other end in the width direction of the coating layer B (the end in the width direction of the coating layer B corresponding to RA2)
d1, d2 Amount of displacement of both end portions in the width direction of the coating layer B with respect to both end portions in the width direction of the coating layer A MA Five sections obtained by dividing the central portion of the coating layer A into five equal parts in the width direction MP MA (Measurement position when calculating the average thickness of the coating layer A)
5 areas where the central part of the NA coating layer B is divided into 5 equal parts in the width direction NP NA width direction center position (measurement position when calculating the average thickness of the coating layer B)

Claims (4)

It is a roll-shaped product in which a coating film A is laminated on one surface of a base film, and a laminated film in which a coating layer B is laminated on the other surface of the base film is wound up,
The thickness of both end portions in the film width direction of the coating layer A of the laminated film is larger than the thickness of the central portion in the film width direction of the coating layer A,
The thickness of both ends in the film width direction of the coating layer B of the laminated film is larger than the thickness of the central part in the film width direction of the coating layer B,
At one end in the film width direction of the coating layer A of the laminated film, the position A1 in the width direction of the laminated film, where the thickness of the coating layer A shows the maximum value,
The absolute value D1 (D1 = | A1-B1 |) of the difference from the position B1 in the width direction of the laminated film in which the thickness of the coating layer B shows the maximum value at the end in the film width direction of the coating layer B corresponding thereto. Is 1 mm or more,
At the other end in the film width direction of the coating layer A of the laminated film, the position A2 in the width direction of the laminated film, where the coating layer A shows the maximum thickness,
The absolute value D2 (D2 = | A2-B2 |) of the difference from the position B2 in the width direction of the laminated film in which the thickness of the coating layer B shows the maximum value at the end in the film width direction of the coating layer B corresponding thereto. Is a roll of laminated film having a thickness of 1 mm or more.   The roll-like product of a laminated film according to claim 1, wherein the thickness of the base film is 200 µm or less, and the roll length of the roll-like product of the laminated film is 300 m or more.   The roll-form thing of the laminated film of Claim 1 or 2 whose contact angle with respect to the water of the coating layer A and the coating layer B is 75 degrees or less, respectively.   The roll-form thing of the laminated | multilayer film in any one of Claims 1-3 whose coating layer A and coating layer B are hard-coat layers, respectively.

Images