JP2017171849A - Adhesive film roll and manufacturing method therefor, method for suppressing deviation in winding of adhesive film and method for predicting size of deviation in winding of adhesive film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for enhancing productivity of an adhesive film having an urethane-based adhesive layer.SOLUTION: There is provided an adhesive film roll by winding an adhesive film having a substrate film and an urethane-based adhesive layer laminated on at least one surface of the substrate film on a core material, by winding the adhesive film with length of 200 m or more on the core material, at least a part of at least one end in a width direction of the substrate film has a zone where no urethane-based adhesive layer is laminated, and distance between a surface vertical to a center axis of the core material including an end part in the width direction of the substrate film of the nearest part to the core material and a surface vertical to the center axis of the core material including the end part in the width direction of the substrate film at a position of 200 m from initiation of winding of the adhesive film, in at least one end of the adhesive film roll, is 5 mm or less.SELECTED DRAWING: None

Description

  The present invention relates to an adhesive film roll and a method for producing the same, a method for suppressing winding deviation of an adhesive film, and a method for predicting the magnitude of winding deviation of an adhesive film.

  As an adhesive film having a property (removability) that can be peeled off after being attached to an adherend, an adhesive film in which a urethane adhesive layer is laminated on a base film is used. For example, Patent Document 1 discloses a polyurethane resin (A) 100 parts by weight having a primary hydroxyl group at a terminal and a hydroxyl value of 10 to 40 mgKOH / g on a plastic film substrate, a polyfunctional isocyanate compound (B). 1 to 20 parts by weight, and a re-peelable urethane pressure-sensitive adhesive comprising 10 to 100 parts by weight of at least one selected from a polyalkylene glycol compound, an epoxy compound and a phosphate ester compound (C) A releasable pressure-sensitive adhesive film on which a pressure-sensitive adhesive layer of the composition is formed is described.

Japanese Patent Laying-Open No. 2015-7226

  When laminating a urethane-based pressure-sensitive adhesive layer on a base film to produce a pressure-sensitive adhesive film, an area where the urethane-based pressure-sensitive adhesive layer is not stacked (a so-called “ear” area) is formed at the widthwise end of the base film. Is generally provided. Moreover, it is common that an adhesive film is wound up in roll shape by the core material in a manufacture process. Therefore, the adhesive film of the adhesive film roll which wound up the adhesive film immediately after manufacture normally has an "ear".

  However, in particular, when an adhesive film having a urethane-based adhesive layer immediately after production is wound around a core material, winding deviation occurs and a long adhesive film cannot be wound, which improves the productivity of the adhesive film. There were cases where it was an obstacle. That is, winding deviation may occur in the pressure-sensitive adhesive film roll having the urethane pressure-sensitive adhesive layer and winding up the pressure-sensitive adhesive film having “ears”.

  In addition, the adhesive film may be processed into a new adhesive film roll by rewinding it to another core material from the adhesive film roll wound up with the adhesive film having “ears” immediately after manufacture. The “ear” portion of the film may be cut. In this case, even when the winding film is wound on the pressure-sensitive adhesive film roll wound up immediately after the production, it is possible to reduce the winding shift when rewinding to another core material. However, rewinding to another core material in order to reduce winding deviation leads to a decrease in productivity of the adhesive film.

  This invention is made | formed in view of such a situation, and it aims at providing the technique which improves the productivity of the adhesive film which has a urethane type adhesive layer.

The present invention is as follows.
[1] An adhesive film roll comprising a base film and a urethane-based adhesive layer laminated on at least one surface of the base film, wound around a core material, the adhesive film The roll is formed by winding the adhesive film having a length of 200 m or more around the core material, and at least a part of at least one end in the width direction of the base film is laminated with a urethane-based adhesive layer. A surface perpendicular to the central axis of the core material including an end portion in the width direction of the base film at a portion closest to the core material at least at one end of the adhesive film roll, The distance between the surface perpendicular to the central axis of the core member including the end in the width direction of the base film at a position 200 m from the start of winding of the adhesive film is 5 mm or less. Rumuroru.
[2] A pressure-sensitive adhesive film comprising a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film, and wound around a core material by 200 m or more without causing winding slippage. A method for producing a film roll, the step of applying a urethane-based pressure-sensitive adhesive composition containing a urethane-based pressure-sensitive adhesive and a solvent on at least one surface of the base film, and from the urethane-based pressure-sensitive adhesive composition, A step of removing a solvent to form a urethane-based pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive film, and a step of winding the pressure-sensitive adhesive film on a core material by 200 m or more, wherein the pressure-sensitive adhesive film is wound on the core material The manufacturing method whose deviation | shift amount measured by the following measuring method in the environment of temperature 23 degreeC and humidity 50% is 10 mm or less.
(Measuring method)
The adhesive film is cut into a width of 15 mm and a length of 50 mm. Subsequently, as shown in FIG. 1, one end in the major axis direction of the pressure-sensitive adhesive film, and one end in the major axis direction of the release film coated with a silicone-based release agent, cut to a width of 15 mm and a length of 50 mm, The major axis direction of the adhesive film is parallel to the major axis direction of the release film, and the urethane adhesive layer of the adhesive film and the silicone release agent of the release film are applied. The laminated surfaces are laminated so as to be in contact with each other in a region having a width of 15 mm and a length of 15 mm, and a 2000 g roll is reciprocated once for pasting. Subsequently, the other end of the release film is fixed, a weight of 200 g is attached to the other end of the pressure-sensitive adhesive film, and the amount of shift between the release film and the pressure-sensitive adhesive film is measured after 1 minute to obtain the amount of shift.
[3] Suppresses winding of the pressure-sensitive adhesive film that occurs when a pressure-sensitive adhesive film including a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film is wound around a core material. A method of applying a urethane-based pressure-sensitive adhesive composition containing a urethane-based pressure-sensitive adhesive and a solvent on at least one surface of the base film, and removing the solvent from the urethane-based pressure-sensitive adhesive composition Forming a urethane-based pressure-sensitive adhesive layer and obtaining a pressure-sensitive adhesive film, and winding the pressure-sensitive adhesive film around a core material. When the pressure-sensitive adhesive film is wound around the core material, the temperature is measured by the following measurement method. A method in which the amount of deviation measured under an environment of 23 ° C. and a humidity of 50% is 10 mm or less.
(Measuring method)
The adhesive film is cut into a width of 15 mm and a length of 50 mm. Subsequently, as shown in FIG. 1, one end in the major axis direction of the pressure-sensitive adhesive film, and one end in the major axis direction of the release film coated with a silicone-based release agent, cut to a width of 15 mm and a length of 50 mm, The major axis direction of the adhesive film is parallel to the major axis direction of the release film, and the urethane adhesive layer of the adhesive film and the silicone release agent of the release film are applied. The laminated surfaces are laminated so as to be in contact with each other in a region having a width of 15 mm and a length of 15 mm, and a 2000 g roll is reciprocated once for pasting. Subsequently, the other end of the release film is fixed, a weight of 200 g is attached to the other end of the pressure-sensitive adhesive film, and the amount of shift between the release film and the pressure-sensitive adhesive film is measured after 1 minute to obtain the amount of shift.
[4] A pressure-sensitive adhesive film obtained by applying a urethane-based pressure-sensitive adhesive composition containing a urethane-based pressure-sensitive adhesive and a solvent to a base film, and removing the solvent to form a urethane-based pressure-sensitive adhesive layer is 200 m or more of a core material. A method of predicting the degree of winding deviation of the pressure-sensitive adhesive film when wound on the core, and when winding the pressure-sensitive adhesive film on the core material, the temperature is 23 ° C. and the humidity is 50% by the following measurement method. The method of predicting that the winding deviation is small when the deviation amount measured in step 1 is 10 mm or less, and predicting that the winding deviation is large when the deviation amount exceeds 10 mm.
(Measuring method)
The adhesive film is cut into a width of 15 mm and a length of 50 mm. Subsequently, as shown in FIG. 1, one end in the major axis direction of the pressure-sensitive adhesive film, and one end in the major axis direction of the release film coated with a silicone-based release agent, cut to a width of 15 mm and a length of 50 mm, The major axis direction of the adhesive film is parallel to the major axis direction of the release film, and the urethane adhesive layer of the adhesive film and the silicone release agent of the release film are applied. The laminated surfaces are laminated so as to be in contact with each other in a region having a width of 15 mm and a length of 15 mm, and a 2000 g roll is reciprocated once for pasting. Subsequently, the other end of the release film is fixed, a weight of 200 g is attached to the other end of the pressure-sensitive adhesive film, and the amount of shift between the release film and the pressure-sensitive adhesive film is measured after 1 minute to obtain the amount of shift.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which improves the productivity of the adhesive film which has a urethane type adhesive layer can be provided.

It is a schematic diagram explaining the measuring method of deviation | shift amount. (A) is a perspective view which shows the structure of the adhesive film roll which concerns on 1 embodiment. (B) is an arrow directional cross-sectional view in the bb line of (a). (C) is a perspective view which shows the structure of the adhesive film roll in which winding deviation produced. (D) is an arrow directional cross-sectional view in the dd line | wire of (c).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as the case may be. Note that the dimensional ratio in the drawing is exaggerated for the sake of explanation and does not necessarily match the actual dimensional ratio.

[Adhesive film roll]
In one embodiment, the present invention is an adhesive film roll in which an adhesive film comprising a base film and a urethane-based adhesive layer laminated on at least one surface of the base film is wound around a core material. In the adhesive film roll, the adhesive film having a length of 200 m or more is wound around the core material, and at least a part of at least one end in the width direction of the base film is urethane-based. It has a region where the pressure-sensitive adhesive layer is not laminated, and at least at one end of the pressure-sensitive adhesive film roll, on the central axis of the core material including the end portion in the width direction of the base film closest to the core material The distance between the vertical surface and the surface perpendicular to the central axis of the core material including the end in the width direction of the base film at a position 200 m from the start of winding of the adhesive film is: mm or less, to provide an adhesive film roll.

  Fig.2 (a) is a perspective view which shows the structure of the adhesive film roll 200 of this embodiment. FIG. 2B is a cross-sectional view taken along line bb in FIG. The pressure-sensitive adhesive film roll 200 is formed by winding a pressure-sensitive adhesive film 210 including a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film around a core material 220.

  The adhesive film roll 200 is obtained by winding an adhesive film 210 having a length of 200 m or more around a core material 220, and at least a part of at least one end in the width direction of the base film 210 is a urethane-based adhesive layer. Have regions that are not stacked. In addition, at least one end of the adhesive film roll 200, a surface perpendicular to the central axis 225 of the core material 220 including the width direction end w1 of the base film closest to the core material 220, and the winding of the adhesive film 210 A distance D between the surface perpendicular to the central axis 225 of the core member 220 including the end portion w2 in the width direction of the base film at a position of 200 m from the beginning is 5 mm or less.

  On the other hand, FIG.2 (c) is a perspective view which shows the structure of the adhesive film roll 300 in which winding deviation produced. FIG. 2D is a cross-sectional view taken along the line dd in FIG. The pressure-sensitive adhesive film roll 300 is formed by winding a pressure-sensitive adhesive film 310 including a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film around a core material 320.

  The adhesive film roll 300 is obtained by winding an adhesive film 310 having a length of 200 m or more around a core material 320, and at least a part of at least one end in the width direction of the base film 310 is a urethane-based adhesive layer. Have regions that are not stacked. Further, at least at one end of the adhesive film roll 300, a surface perpendicular to the central axis 325 of the core material 320 including the width direction end w1 ′ of the base film closest to the core material 320, and the adhesive film 310 The distance D ′ between the surface perpendicular to the central axis 325 of the core member 320 including the end portion w2 ′ in the width direction of the base film at a position of 200 m from the start of winding exceeds 5 mm.

  In the pressure-sensitive adhesive film roll of the present embodiment, the pressure-sensitive adhesive film may be a removable film. The adhesive film roll of this embodiment can be manufactured by the manufacturing method mentioned later. The pressure-sensitive adhesive film roll of the present embodiment has a length of pressure-sensitive adhesive film of, for example, 200 to 1,000 m, for example, 200 to 2,000 m, for example, 200 to 3,000 m, and is wound without causing winding slippage. High productivity of adhesive film.

  If there is a winding slip in the adhesive film roll, the commercial value is impaired. Then, when a long adhesive film cannot be wound up, it takes time and effort to divide the adhesive film roll into a large number of short films, which may lead to a decrease in productivity of the adhesive film.

  In the present specification, “winding deviation has occurred”, “winding deviation is large”, and “winding deviation amount is large” are the width direction of the portion of the base film closest to the core material in the adhesive film roll Between the surface perpendicular to the central axis of the core material including the edge of the core and the surface perpendicular to the central axis of the core material including the edge in the width direction of the base film at a position 200 m from the start of winding of the adhesive film Means that the distance exceeds 5 mm. On the other hand, “no winding error”, “winding error is suppressed”, “small winding error”, and “small winding error” are closest to the core material in the adhesive film roll. The center of the core material including the edge in the width direction of the base film at the position perpendicular to the central axis of the core material including the end in the width direction of the base film and 200 m from the start of winding of the adhesive film It means that the distance between the surface perpendicular to the axis is 5 mm or less, preferably 4 mm or less, more preferably 3 mm or less, and still more preferably 2 mm or less.

  The urethane-based pressure-sensitive adhesive layer may be laminated only on one side of the base film, or may be laminated on both sides of the base film. The adhesive film may further include a release film on the urethane-based adhesive layer.

  The release film is not particularly limited, and a film usually used in the field of pressure-sensitive adhesive films can be used. As a peeling film, what provided the peeling layer on the surface of a film base material or a paper base material is mentioned, for example.

  Examples of the film substrate include various resin films such as polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, and polyacrylate. Examples of the paper substrate include various paper materials such as polyethylene laminated paper, polypropylene laminated paper, clay coated paper, resin coated paper, glassine paper, and high quality paper. Further, the film base and the paper base may contain a filler such as a filler. Examples of the release layer include those containing a release agent such as silicone, a long-chain alkyl resin, a fluorine resin, an olefin resin, and a rubber resin. The thickness of the release film is usually about 20 to 200 μm.

  In the pressure-sensitive adhesive film roll of the present embodiment, at least a part of at least one end in the width direction of the base film has a region where the urethane-based pressure-sensitive adhesive layer is not laminated.

  From the viewpoint of improving the productivity of the adhesive film, the adhesive film roll of the present embodiment is preferably one obtained by winding up the adhesive film immediately after production. Therefore, it is preferable that the adhesive film roll once wound up is not re-wound around another core material, and the adhesive film has “ears”. Even if the adhesive film roll of this embodiment winds up the adhesive film immediately after manufacture, it can have an adhesive film with a length of 200 m or more without causing winding slippage.

(Base film)
In the pressure-sensitive adhesive film roll of the present embodiment, the substrate film is not particularly limited as long as it is used for a normal pressure-sensitive adhesive film. For example, polyethylene terephthalate, polyethylene naphthalate, polyimide, polyetherimide, polyaramid, polyether Ketone, polyetheretherketone, polyphenylene sulfide, poly (4-methylpentene-1) polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, polyvinyl chloride, vinyl chloride copolymer, polyurethane, ethylene-vinyl acetate copolymer Made of resin such as coalescence, ionomer resin, ethylene (meth) acrylic acid copolymer, polystyrene, polycarbonate, fluororesin, low density polyethylene, linear low density polyethylene, triacetyl cellulose Irumu, these laminates, these foams; woodfree paper, coated paper, glassine paper, a paper substrate or the like laminated paper and the like.

  The thickness in particular of a base film is not restrict | limited, It can set suitably, for example, 15-300 micrometers may be sufficient, for example, 30-200 micrometers may be sufficient.

(Urethane adhesive layer)
In the pressure-sensitive adhesive film roll of the present embodiment, the urethane pressure-sensitive adhesive layer may be formed by removing the solvent from a urethane pressure-sensitive adhesive composition containing a urethane pressure-sensitive adhesive and a solvent.

  The urethane pressure-sensitive adhesive is not particularly limited as long as it is used for a normal pressure-sensitive adhesive film. For example, a urethane pressure-sensitive adhesive having a glass transition point of −20 ° C. or less can be used. In the present specification, the glass transition point is a glass transition point measured by a differential scanning calorimeter. Adhesiveness can be exhibited when the glass transition point is in the above range.

  The urethane-based adhesive may be modified with a resin other than urethane, such as a silicone-based resin, an acrylic resin, and an epoxy resin, as long as the main component is polyurethane. Here, polyurethane as a main component means that the content of the polyurethane portion in the resin constituting the urethane-based pressure-sensitive adhesive is, for example, 50% by mass or more, for example 70% by mass or more, for example 80% by mass or more, in terms of solid content. For example, it means 90% by mass or more. In the present specification, the urethane-based pressure-sensitive adhesive may be a urethane pressure-sensitive adhesive or the above-described modified urethane pressure-sensitive adhesive.

  Examples of the urethane pressure-sensitive adhesive include those having adhesiveness among polyurethanes such as polycarbonate, polyester and polyether. In general, the glass transition point of polyurethane having adhesiveness is generally −20 ° C. or less. Polycarbonate-based polyurethane is obtained from the reaction of polycarbonate polyol and polyisocyanate. Polyester polyurethane is obtained from the reaction of polyester polyol and polyisocyanate. Polyether polyurethane is obtained from the reaction of polyether polyol and polyisocyanate.

  Examples of the polycarbonate polyol include 1,4-tetramethylene type, 1,5-pentamethylene type, 1,6-hexamethylene type, 1,12-dodecane type, 1,4-cyclohexane type, and mixed types thereof. Is mentioned.

  Examples of the polyester polyol include poly (ethylene adipate) diol, poly (propylene adipate) diol, poly (butylene adipate) diol, poly (hexamethylene adipate) diol, poly (butylene isophthalate) diol, and the like.

  Examples of the polyether polyol include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and poly (methyl tetramethylene glycol).

  Polyisocyanates include aromatic diisocyanates such as 4,4′-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, m-xylene diisocyanate; hexamethylene diisocyanate, trimethylene diisocyanate, tetra Aliphatic diisocyanates such as methylene diisocyanate; alicyclic diisocyanates such as 1,3-cyclopentene diisocyanate, 1,4-cyclohexane diisocyanate, and isophorone diisocyanate.

  By reacting these in accordance with a conventional method, a polycarbonate-based, polyester-based or polyether-based polyurethane can be obtained. As described above, the polyurethane may be modified. These polyurethanes may be used alone or in combination of two or more.

  The urethane-based pressure-sensitive adhesive may be obtained by crosslinking the above-described polyurethane with a polyisocyanate compound as a crosslinking agent. Here, as a polyisocyanate compound, the adduct body, biuret body, isocyanurate body, etc. of the polyisocyanate mentioned above are mentioned.

  The weight average molecular weight of the urethane-based pressure-sensitive adhesive may be, for example, 50,000 to 300,000, for example, 80,000 to 200,000, for example, 100,000 to 180,000. Good. In the present specification, the “weight average molecular weight” is a value in terms of polystyrene measured by a gel permeation chromatography (GPC) method.

  The thickness in particular of a urethane type adhesive layer is not restrict | limited, For example, 5-100 micrometers may be sufficient, for example, 10-50 micrometers may be sufficient.

(Urethane-based adhesive composition)
A urethane type adhesive composition contains the urethane type adhesive mentioned above and a solvent. Examples of the solvent include organic solvents such as aromatic hydrocarbons such as toluene and benzene; alcohols such as isopropyl alcohol, n-butanol, isobutanol, t-butanol and diacetone alcohol; methyl ethyl ketone, diethyl ketone and methyl. Ketones such as isobutyl ketone, cyclohexanone, diacetone alcohol; ethers such as dipropyl ether, dibutyl ether, anisole, dioxane, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate; Examples thereof include esters such as ethyl acetate, propyl acetate, butyl acetate and cyclohexyl acetate.

  The urethane-based pressure-sensitive adhesive composition may contain other components as necessary. Examples of other components include, for example, a crosslinking agent, a crosslinking accelerator, a tackifier, an antioxidant, an ultraviolet absorber, a light stabilizer, a softener, a plasticizer, and a silane, which are usually used as a material for a pressure-sensitive adhesive film. Examples include coupling agents, fillers, reaction retarders, and the like. These may be used alone or in combination of two or more.

(Core material)
In the pressure-sensitive adhesive film roll of the present embodiment, the core material is not particularly limited as long as it is used for a normal pressure-sensitive adhesive film roll, but a cylindrical shape is preferable. Examples of the material for the core material include paper, metal, and plastic.

[Method for producing adhesive film roll]
In one embodiment, the present invention is a pressure sensitive adhesive film comprising a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film. A method for producing a pressure-sensitive adhesive film roll that is wound up, the step of applying a urethane-based pressure-sensitive adhesive composition containing a urethane-based pressure-sensitive adhesive and a solvent on at least one surface of the base film, and the urethane-based film Removing the solvent from the pressure-sensitive adhesive composition to form a urethane-based pressure-sensitive adhesive layer, and obtaining a pressure-sensitive adhesive film; and winding the pressure-sensitive adhesive film on a core material by 200 m or more; Provided is a production method in which the amount of deviation measured under an environment of a temperature of 23 ° C. and a humidity of 50% by the following measurement method is 10 mm or less when wound on a core material.

(Measuring method)
The adhesive film is cut into a width of 15 mm and a length of 50 mm. Subsequently, the one end in the major axis direction of the pressure-sensitive adhesive film and the one end in the major axis direction of the release film coated with the silicone-based release agent, cut to a width of 15 mm and a length of 50 mm, The central axis in the axial direction and the central axis in the major axis direction of the release film are parallel, and the urethane adhesive layer of the adhesive film and the surface of the release film on which the silicone release agent is applied have a width. Laminate so as to come into contact with each other in a region of 15 mm and a length of 15 mm, and paste by reciprocating a 2000 g roll. Subsequently, the other end of the release film is fixed, a weight of 200 g is attached to the other end of the pressure-sensitive adhesive film, and the amount of shift between the release film and the pressure-sensitive adhesive film is measured after 1 minute to obtain the amount of shift.

  The measurement method will be described in more detail. FIG. 1 is a schematic diagram for explaining the measurement method. In the above measuring method, first, as shown in FIG. 1, the adhesive film 10 is cut into a width of 15 mm and a length of 50 mm. Here, when the peeling film is laminated | stacked on the urethane type adhesive layer 10a of the adhesive film 10, this is peeled. Subsequently, the one end 11 in the major axis direction of the adhesive film 10 and the one end 21 in the major axis direction of the release film 20 coated with the silicone release agent cut to a width of 15 mm and a length of 50 mm are used as the adhesive film. The central axis 12 in the major axis direction of 10 and the central axis 22 in the major axis direction of the release film 20 are parallel to each other, and the urethane adhesive layer 10a of the adhesive film 10 and the silicone release agent of the release film 20 are applied. The surface 20a is laminated so as to be in contact with a region having a width of 15 mm and a length of 15 mm, and a 2000 g roll is reciprocated once and pasted.

  As a roll of 2000 g, a roll specified in JIS Z0237: 2009 “10.2.4 Press-bonding device” is used. More specifically, on a steel roll having a diameter of 85 ± 2.5 mm and a width of 45 ± 1.5 mm, the durometer hardness specified in JIS K 6253: 2006 is A80 ± 5 and the thickness is about 6 mm. The roll is covered with a rubber, and the surface thereof is an accurate cylinder, has no irregularities, and has a roller mass of 2000 ± 100 g. When the test piece is pressure-bonded with a roll, only the mass of the roll is applied to the test piece.

  Subsequently, the other end 23 of the release film 20 is fixed, a 200 g weight is attached to the other end 13 of the adhesive film 10, and the amount of deviation between the release film 20 and the adhesive film 10 is measured after 1 minute, and is defined as the amount of deviation. . In addition, when the deviation | shift amount is 15 mm or more, the peeling film 20 and the adhesive film 10 will leave | separate and the adhesive film 10 will fall.

  Since the crosslinking of the urethane-based pressure-sensitive adhesive layer proceeds with time, it is preferable to perform the above measurement of the amount of deviation when the pressure-sensitive adhesive film is wound around a core material in the production of a pressure-sensitive adhesive film roll. That is, in the production of the pressure-sensitive adhesive film roll, it is necessary to apply the urethane pressure-sensitive adhesive composition on the base film, remove the solvent from the urethane-based pressure-sensitive adhesive composition, and wind the pressure-sensitive adhesive film around the core material. In the time and method of measuring the amount of deviation, the time required to measure the amount of deviation after applying the urethane-based pressure-sensitive adhesive composition on the base film and removing the solvent from the urethane-based pressure-sensitive adhesive composition It is preferable to agree. Therefore, in the manufacturing method of the present embodiment, “when the adhesive film is wound around the core” may be “when it corresponds to when the adhesive film is wound around the core”.

  In the manufacturing method of this embodiment, the amount of deviation is preferably 9 mm or less, more preferably 7 mm or less, still more preferably 5 mm or less, and particularly preferably 4 mm or less. As the amount of deviation is smaller, the winding deviation of the adhesive film roll tends to be smaller.

  Hereinafter, each process of the manufacturing method of this embodiment is demonstrated.

(Process of applying a urethane-based pressure-sensitive adhesive composition on a base film)
In this step, the urethane pressure-sensitive adhesive composition is applied on at least one surface of the base film. About a base film and a urethane type adhesive composition, it is the same as that of what was mentioned above. The urethane adhesive composition may be applied by a known method, for example, an air knife coater, blade coater, bar coater, gravure coater, roll coater, roll knife coater, curtain coater, die coater, knife coater, screen. Examples include a method using various coaters such as a coater, a Meyer bar coater, a kiss coater and the like.

  The coating thickness of the urethane-based pressure-sensitive adhesive composition may be adjusted as appropriate, but the thickness of the pressure-sensitive adhesive layer after solvent removal described later may be, for example, a coating thickness of 5 to 100 μm, such as 10 to 50 μm. The coating thickness may be.

(Step of obtaining an adhesive film)
In this step, the solvent is removed from the urethane-based pressure-sensitive adhesive composition to form a urethane-based pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive film. Although the removal method in particular of a solvent is not restrict | limited, For example, volatilizing a solvent by heating is mentioned. The heating temperature may be, for example, 70 to 130 ° C., and the heating time may be, for example, 1 to 5 minutes.

(Step of winding the adhesive film around the core)
In this step, the adhesive film is wound around the core material. A normal winder can be used for winding the adhesive film. The winding tension at the time of winding the adhesive film may be, for example, 50 to 400 N / m, for example, 100 to 300 N / m, for example, 200 to 300 N / m.

  When the pressure-sensitive adhesive film is wound around the core material, the amount of deviation measured by the measurement method described above in an environment of a temperature of 23 ° C. and a humidity of 50% is 10 mm or less. According to the manufacturing method of this embodiment, even when the adhesive film is wound up by 200 m or more, the winding deviation is small.

(Adjustment method of deviation)
As a method of reducing the amount of deviation measured by the measurement method described above, the thickness of the urethane-based pressure-sensitive adhesive layer is reduced by adjusting the composition of the urethane-based pressure-sensitive adhesive composition so that the polymerization rate of the urethane-based pressure-sensitive adhesive is increased. And a method of increasing the time from the formation of the urethane pressure-sensitive adhesive layer to the start of winding.

  As a method for increasing the polymerization rate of the urethane-based pressure-sensitive adhesive, a urethane pressure-sensitive adhesive having a high weight average molecular weight is used, and the addition amount of the crosslinking agent contained in the urethane-based pressure-sensitive adhesive composition is increased. For example, a crosslinking accelerator may be added to the composition. Examples of crosslinking accelerators include dioctyltin dilaurate, dibutyltin dichloride, dibutyltin oxide, dibutyltin dibromide, dibutyltin dimaleate, dibutyltin dilaurate (DBTDL), dibutyltin diacetate, dibutyltin sulfide, tributyltin sulfide, tributyltin oxide. , Tributyltin acetate, triethyltin ethoxide, tributyltin ethoxide, dioctyltin oxide, tributyltin chloride, tributyltin trichloroacetate, tin 2-ethylhexanoate tin, dibutyltitanium dichloride, tetrabutyltitanate, butoxytitanium trichloride, etc. Titanium series, lead oleate, lead 2-ethylhexanoate, lead benzoate, lead naphthenate, etc., iron 2-ethylhexanoate, iron Iron series such as cetylacetonate, cobalt series such as cobalt benzoate and cobalt 2-ethylhexanoate, zinc series such as zinc naphthenate and zinc 2-ethylhexanoate, zirconium series such as zirconium naphthenate, bismuth carboxylate, Examples thereof include bismuth-based crosslinking accelerators such as bismuth octoate (bismuth salt of 2-ethylhexanoic acid).

[Method for suppressing winding deviation of adhesive film]
In one embodiment, the present invention is the pressure-sensitive adhesive film generated when a pressure-sensitive adhesive film comprising a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film is wound around a core material. A step of applying a urethane-based pressure-sensitive adhesive composition containing a urethane-based pressure-sensitive adhesive and a solvent on at least one surface of the base film, and the urethane-based pressure-sensitive adhesive composition And removing the solvent to form a urethane-based pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive film, and winding the pressure-sensitive adhesive film around a core material. When the pressure-sensitive adhesive film is wound around the core material, Provided is a method in which the amount of deviation measured by the measurement method described above in an environment of a temperature of 23 ° C. and a humidity of 50% is 10 mm or less.

  As shown in the examples described later, according to the method of the present embodiment, it is possible to suppress winding slippage when the adhesive film is wound around the core material.

[Method of predicting the magnitude of winding deviation of adhesive film]
In one embodiment, the present invention is a pressure-sensitive adhesive obtained by applying a urethane-based pressure-sensitive adhesive composition containing a urethane-based pressure-sensitive adhesive and a solvent to a base film, and removing the solvent to form a urethane-based pressure-sensitive adhesive layer. A method for predicting the magnitude of winding deviation of the pressure-sensitive adhesive film when the film is wound on a core material by 200 m or more, and when the pressure-sensitive adhesive film is wound on the core material, a temperature of 23 is measured by the measurement method described above. When the amount of deviation measured in an environment of 50 ° C. and humidity is 10 mm or less, the winding deviation is predicted to be small, and the measurement is performed in an environment of temperature 23 ° C. and humidity 50% by the measurement method described above. Provided is a method for predicting that the winding deviation is large when the deviation amount exceeds 10 mm.

  According to the method of this embodiment, even if the adhesive film is not actually wound on the core material for 200 m or more, the magnitude of the winding deviation when the adhesive film is wound on the core material for 200 m or more can be predicted. In the present specification, “large winding deviation” and “small winding deviation” represent the above-described meanings.

  EXAMPLES Next, although an Example is shown and this invention is demonstrated further in detail, this invention is not limited to a following example.

[Measurement and evaluation method]
(Measurement of deviation)
The adhesive films of Examples and Comparative Examples were cut to a width of 15 mm and a length of 50 mm, and the release film laminated on the adhesive layer of the adhesive film was peeled off. Further, a release film in which a silicone release agent was applied to a 38 μm thick polyethylene terephthalate film was cut into a width of 15 mm and a length of 50 mm. Subsequently, as shown in FIG. 1, the one end in the major axis direction of the adhesive film and the one end in the major axis direction of the release film are connected to the central axis in the major axis direction of the adhesive film and the major axis direction of the release film. Lamination is performed so that the central axis is parallel, and the urethane adhesive layer of the adhesive film and the surface of the release film coated with the silicone release agent are in contact with each other in a 15 mm wide and 15 mm long region. JIS Z0237: The 2000-g roll prescribed | regulated to 2009 "10.2.4 crimping | compression-bonding apparatus" was reciprocated once, and it stuck.

  Subsequently, the other end of the release film was fixed, a weight of 200 g was attached to the other end of the adhesive film, and the amount of deviation between the release film and the adhesive film was measured after 1 minute, and was defined as the amount of deviation. In addition, when the deviation | shift amount was 15 mm or more, the adhesive film fell. In this case, the time from the start of the test until the adhesive film dropped was measured.

(Measurement of winding deviation of adhesive film roll)
The pressure-sensitive adhesive films of Examples and Comparative Examples were wound on a core material by 200 m or more using a winder to produce a pressure-sensitive adhesive film roll. The winding tension was set to 250 N / m. These pressure-sensitive adhesive film rolls have regions (ears) where the urethane pressure-sensitive adhesive layer is not laminated at the end in the width direction of the base film. In the pressure-sensitive adhesive film roll, the width of the base film at a position perpendicular to the central axis of the core material including the end portion in the width direction of the base material film closest to the core material and the position 200 m from the start of winding of the adhesive film The distance between the surface perpendicular to the central axis of the core material including the end portion in the direction was measured and used as the amount of winding deviation.

[Manufacture of adhesive film]
(material)
As the urethane-based pressure-sensitive adhesive, a polyurethane having a glass transition point of −59 ° C. (weight average molecular weight 150,000, solid content 57% by mass) (hereinafter referred to as “urethane-based pressure-sensitive adhesive of“ Test Example 1 ”) or glass transition point of −59 ° C. Polyurethane (weight average molecular weight 120,000, solid content 64% by mass) (hereinafter referred to as “urethane-based adhesive of“ Test Example 2 ”) was used. Moreover, the polyisocyanate compound (Coronate HX, the Tosoh company make) was used as a crosslinking agent. Further, dioctyltin dilaurate (solid content: 2.5% by mass) was used as a crosslinking accelerator.

Example 1
To the solvent (toluene), a urethane-based pressure-sensitive adhesive, a cross-linking agent, and a cross-linking accelerator were added in the blending amounts shown in Table 1 and mixed to prepare a urethane-based pressure-sensitive adhesive composition. Subsequently, the urethane-based pressure-sensitive adhesive composition was applied to a polyethylene terephthalate film (model number “Lumirror T-60”, Toray Industries, Inc.) having a thickness of 50 μm so that the thickness after drying was 15 μm, and 100 ° C. Was dried for 1 minute to form a urethane-based pressure-sensitive adhesive layer, and a release film was bonded to the urethane-based pressure-sensitive adhesive layer to obtain the pressure-sensitive adhesive film of Example 1.

(Examples 2-4, Comparative Examples 1-3)
Implemented in the same manner as in Example 1 except that the type of urethane pressure-sensitive adhesive, the amount of urethane-based pressure-sensitive adhesive, the amount of crosslinking agent and crosslinking accelerator, and the thickness of the urethane-based pressure-sensitive adhesive layer were changed as shown in Table 1. The adhesive films of Examples 2 to 4 and Comparative Examples 1 to 3 were obtained.

(Evaluation)
About the adhesive film of an Example and a comparative example, according to the evaluation method mentioned above, the shift | offset | difference amount and the winding shift | offset | difference amount of the adhesive film roll were measured. The amount of deviation and the amount of winding deviation were measured 30 minutes after the urethane-based pressure-sensitive adhesive composition was applied to the polyethylene terephthalate film and dried at 100 ° C. for 1 minute in the production process of the pressure-sensitive adhesive film. The results are shown in Table 1.

  As a result, in the adhesive films of Examples 1 to 4, the amount of winding deviation of the adhesive film roll was 5 mm or less, and the winding deviation was small. Moreover, the winding deviation | shift amount of the adhesive film roll and the deviation | shift amount measured by the measuring method mentioned above showed high correlation.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which improves the productivity of the adhesive film which has a urethane type adhesive layer can be provided.

  DESCRIPTION OF SYMBOLS 10 ... Adhesive film, 10a ... Urethane type adhesive layer, 11, 13, 21, 23 ... End, 12, 22 ... Center axis, 20 ... Release film, 20a ... Surface, 200, 300 ... Adhesive film roll, 210, 310 ... Adhesive film, 220, 320 ... Core material, 225, 325 ... Central axis, w1, w1 ', w2, w2' ... End in width direction of base film, D, D '... Distance.

Claims (4)

A pressure-sensitive adhesive film comprising a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film is a pressure-sensitive adhesive film roll wound around a core material,
The pressure-sensitive adhesive film roll is formed by winding the pressure-sensitive adhesive film having a length of 200 m or more around the core material,
At least a part of at least one end in the width direction of the base film has a region where the urethane-based pressure-sensitive adhesive layer is not laminated,
At least one end of the pressure-sensitive adhesive film roll, a surface perpendicular to the central axis of the core material including the end portion in the width direction of the base film closest to the core material, and 200 m from the start of winding of the pressure-sensitive adhesive film The adhesive film roll whose distance between the surface perpendicular | vertical to the central axis of the said core material including the edge part of the width direction of the said base film in the position of 5 mm or less is 5 mm or less. A pressure-sensitive adhesive film roll comprising a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film is wound on a core material by 200 m or more without causing winding slippage. A manufacturing method comprising:
Applying a urethane-based pressure-sensitive adhesive composition containing a urethane-based pressure-sensitive adhesive and a solvent on at least one surface of the base film;
Removing the solvent from the urethane-based pressure-sensitive adhesive composition to form a urethane-based pressure-sensitive adhesive layer, and obtaining a pressure-sensitive adhesive film;
A step of winding the adhesive film on the core material by 200 m or more;
And the adhesive film has a deviation amount of 10 mm or less as measured in an environment of a temperature of 23 ° C. and a humidity of 50% by the following measurement method when wound on the core material.
(Measuring method)
The adhesive film is cut into a width of 15 mm and a length of 50 mm. Subsequently, as shown in FIG. 1, one end in the major axis direction of the pressure-sensitive adhesive film, and one end in the major axis direction of the release film coated with a silicone-based release agent, cut to a width of 15 mm and a length of 50 mm, The major axis direction of the adhesive film is parallel to the major axis direction of the release film, and the urethane adhesive layer of the adhesive film and the silicone release agent of the release film are applied. The laminated surfaces are laminated so as to be in contact with each other in a region having a width of 15 mm and a length of 15 mm, and a 2000 g roll is reciprocated once for pasting. Subsequently, the other end of the release film is fixed, a weight of 200 g is attached to the other end of the pressure-sensitive adhesive film, and the amount of shift between the release film and the pressure-sensitive adhesive film is measured after 1 minute to obtain the amount of shift. It is a method of suppressing winding deviation of the pressure-sensitive adhesive film that occurs when a pressure-sensitive adhesive film comprising a base film and a urethane-based pressure-sensitive adhesive layer laminated on at least one surface of the base film is wound around a core material. And
Applying a urethane-based pressure-sensitive adhesive composition containing a urethane-based pressure-sensitive adhesive and a solvent on at least one surface of the base film;
Removing the solvent from the urethane-based pressure-sensitive adhesive composition to form a urethane-based pressure-sensitive adhesive layer, and obtaining a pressure-sensitive adhesive film;
Winding the adhesive film around a core material;
And the adhesive film has a deviation amount of 10 mm or less measured in an environment of a temperature of 23 ° C. and a humidity of 50% by the following measurement method when wound on the core material.
(Measuring method)
The adhesive film is cut into a width of 15 mm and a length of 50 mm. Subsequently, as shown in FIG. 1, one end in the major axis direction of the pressure-sensitive adhesive film, and one end in the major axis direction of the release film coated with a silicone-based release agent, cut to a width of 15 mm and a length of 50 mm, The major axis direction of the adhesive film is parallel to the major axis direction of the release film, and the urethane adhesive layer of the adhesive film and the silicone release agent of the release film are applied. The laminated surfaces are laminated so as to be in contact with each other in a region having a width of 15 mm and a length of 15 mm, and a 2000 g roll is reciprocated once for pasting. Subsequently, the other end of the release film is fixed, a weight of 200 g is attached to the other end of the pressure-sensitive adhesive film, and the amount of shift between the release film and the pressure-sensitive adhesive film is measured after 1 minute to obtain the amount of shift. A urethane pressure-sensitive adhesive composition containing a urethane pressure-sensitive adhesive and a solvent is applied to a base film, and the pressure-sensitive adhesive film obtained by removing the solvent to form a urethane-based pressure-sensitive adhesive layer is wound on a core material for 200 m or more. Is a method for predicting the magnitude of winding deviation of the adhesive film,
When winding the pressure-sensitive adhesive film around the core material, when the amount of deviation measured under an environment of temperature 23 ° C. and humidity 50% by the following measurement method is 10 mm or less, the winding deviation is predicted to be small, A method of predicting that the winding deviation is large when the deviation amount exceeds 10 mm.
(Measuring method)
The adhesive film is cut into a width of 15 mm and a length of 50 mm. Subsequently, as shown in FIG. 1, one end in the major axis direction of the pressure-sensitive adhesive film, and one end in the major axis direction of the release film coated with a silicone-based release agent, cut to a width of 15 mm and a length of 50 mm, The major axis direction of the adhesive film is parallel to the major axis direction of the release film, and the urethane adhesive layer of the adhesive film and the silicone release agent of the release film are applied. The laminated surfaces are laminated so as to be in contact with each other in a region having a width of 15 mm and a length of 15 mm, and a 2000 g roll is reciprocated once for pasting. Subsequently, the other end of the release film is fixed, a weight of 200 g is attached to the other end of the pressure-sensitive adhesive film, and the amount of shift between the release film and the pressure-sensitive adhesive film is measured after 1 minute to obtain the amount of shift.

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