WO2021070335A1 - Release liner, adhesive sheet, and method for manufacturing adhesive sheet - Google Patents

Release liner, adhesive sheet, and method for manufacturing adhesive sheet Download PDF

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Publication number
WO2021070335A1
WO2021070335A1 PCT/JP2019/040060 JP2019040060W WO2021070335A1 WO 2021070335 A1 WO2021070335 A1 WO 2021070335A1 JP 2019040060 W JP2019040060 W JP 2019040060W WO 2021070335 A1 WO2021070335 A1 WO 2021070335A1
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WO
WIPO (PCT)
Prior art keywords
layer
base material
release liner
cast
adhesive sheet
Prior art date
Application number
PCT/JP2019/040060
Other languages
French (fr)
Japanese (ja)
Inventor
晃司 土渕
貴宏 露▲崎▼
Original Assignee
リンテック株式会社
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Publication date
Application filed by リンテック株式会社 filed Critical リンテック株式会社
Priority to PCT/JP2019/040060 priority Critical patent/WO2021070335A1/en
Priority to JP2021551048A priority patent/JP7549591B2/en
Publication of WO2021070335A1 publication Critical patent/WO2021070335A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

Definitions

  • the present invention relates to a release liner, an adhesive sheet, and a method for producing an adhesive sheet.
  • Patent Document 1 a high-gloss base material layer, an adhesive layer, and a release liner are laminated. The sheet is disclosed. Such an adhesive sheet is peeled off from the release liner and attached to the adherend via the adhesive layer.
  • air may enter between the adhesive sheet and the adherend to cause so-called "blister", but a continuous convex portion is provided on the surface of the release liner, whereby the corresponding concave portion is formed into the adhesive layer. If it is formed in, air is discharged through the recess, so that blistering can be suppressed.
  • the release liner of the paper is provided with a convex portion, although blistering is suppressed, a mark may be left on the base material layer of the adhesive sheet depending on the texture of the paper forming the release liner, which is particularly high gloss. Adhesive sheets are not preferable because such marks are easily noticeable if they remain.
  • an object of the present invention is to provide a release liner, an adhesive sheet, and a method for producing an adhesive sheet that do not easily leave traces of formation.
  • the release liner of the present invention for achieving the above object has a polyolefin layer provided with continuous convex portions on the surface, and a cast coated paper on which the polyolefin layer is laminated.
  • the paper base material on which the cast coat layer forming the surface layer is laminated is formed of wood pulp, and the ratio of N material to L material is 0 or more in terms of mass ratio of N material / L material. It is less than / 3rd.
  • the pressure-sensitive adhesive sheet of the present invention for achieving the above object is a base material layer having a mirror glossiness Gs (60 °) of 60% or more according to JIS Z8741-1997 (ISO 2813: 1994), and a pressure-sensitive adhesive layer. And the release liner are provided in this order in the stacking direction.
  • the method for producing the pressure-sensitive adhesive sheet of the present invention for achieving the above object is among the base material layer having a mirror glossiness Gs (60 °) of 60% or more according to JIS Z8741-1997 and the release liner.
  • a pressure-sensitive adhesive layer is formed on at least one of the layers, and the base material layer and the release liner are bonded to each other via the pressure-sensitive adhesive layer.
  • the cast coated paper used for the release liner has excellent smoothness of the cast coat layer on the surface, and further, the paper base material itself formed of wood pulp is an L material. By including a large amount, it is difficult to form a formation. As a result, the formation of the release liner is effectively suppressed, and it is difficult for traces of formation to remain on the adhesive sheet.
  • the pressure-sensitive adhesive sheet 10 of the embodiment has a base material layer 11, a pressure-sensitive adhesive layer 12, and a release liner 100 in this order in the stacking direction.
  • the adhesive sheet 10 is, for example, a high-gloss decorative sheet that decorates the surface of an adherend such as an automobile, a home appliance, or furniture, and can be used as a substitute for painting, for example.
  • the adhesive sheet 10 is used by peeling off the release liner 100, and is attached to the adherend via the adhesive layer 12.
  • a release agent layer may be formed on the surface of the release liner 100 in contact with the pressure-sensitive adhesive layer 12.
  • the release liner 100 has a convex portion 111, and a concave portion 13 is formed in the pressure-sensitive adhesive layer 12 corresponding to the convex portion 111.
  • the convex portion 111 is continuous and extends in a straight line, but the present invention is not limited to this, and the convex portion 111 may be bent. Further, the number of convex portions 111 is not particularly limited. Further, in the illustrated example, the plurality of convex portions 111 extend in parallel with each other, but the present invention is not limited to this, and a form in which the plurality of convex portions 111 intersect each other in a grid pattern, for example, is also present invention. Is included in the range of.
  • the convex portion 111 has a triangular cross-sectional shape in the cross-sectional shape of the release liner 100 in the thickness direction, but the present invention is not limited to this.
  • the convex portion 111 may have another cross-sectional shape such as a rectangular shape (square, rectangular), a trapezoidal shape, or a semi-elliptical shape.
  • the concave portion 13 has a shape in which the shape of the convex portion 111 is inverted.
  • the pressure-sensitive adhesive sheet 10 has a groove-shaped recess 13 formed in the pressure-sensitive adhesive layer 12, even if air enters between the adherend and the adherend when the pressure-sensitive adhesive sheet 10 is attached to the adherend, the air can pass through the recess 13. It is discharged and can suppress blisters.
  • the adhesive sheet 10 decorates the adherend with the color and luster imparted to the base material layer 11. Further, the base material layer 11 may be provided with a handle.
  • the mirror glossiness Gs (60 °) according to JIS Z8741-1997 is 60% or more.
  • the upper limit of the mirror glossiness Gs (60 °) is not particularly limited, but is, for example, 120%.
  • the mirror glossiness Gs (60 °) can be measured by, for example, a gloss meter “VG7000” manufactured by Nippon Denshoku Kogyo Co., Ltd.
  • the base material layer 11 preferably contains a colorant and a resin.
  • the thickness of the base material layer 11 is not particularly limited, but is, for example, 50 ⁇ m or more and 200 ⁇ m or less.
  • Examples of the resin forming the base material layer 11 include polyurethane, polyolefin, polyvinyl chloride, ethylene-vinyl acetate copolymer and the like.
  • Examples of the colorant contained in the base material layer 11 include carbon black (furness black, channel black, acetylene black, thermal black, lamp black, pine smoke, etc.), graphite (graphite), copper oxide, manganese dioxide, and aniline black. , Perylene black, titanium black, cyanine black, activated carbon, ferrite (non-magnetic ferrite, magnetic ferrite, etc.), magnetite, chromium oxide, iron oxide, molybdenum disulfide, chromium complex, composite oxide black dye, anthraquinone organic black dye And so on.
  • the base material layer 11 may have a clear layer whose gloss can be adjusted on the surface opposite to the pressure-sensitive adhesive layer 12.
  • a clear layer whose gloss can be adjusted on the surface opposite to the pressure-sensitive adhesive layer 12.
  • the resin forming the clear layer for example, fluororesin; polyurethane; acrylic polymer; polyvinyl chloride; polyolefin such as polyethylene and polypropylene; thermoplastic elastomer such as olefin and polyester; and resin such as ionomer can be used.
  • the base material layer 11 may be a stabilizer (for example, Ba—Zn type, etc.), a lubricant, a filler, a processing aid, a plasticizer, a softener, a metal powder, an antifogging agent, an ultraviolet scattering agent, or the like, if necessary.
  • An ultraviolet shielding agent such as an ultraviolet absorber, an antioxidant, an antistatic agent, a hard-twisting agent and the like may be appropriately contained.
  • the pressure-sensitive adhesive layer 12 is not particularly limited as long as it can exhibit a desired adhesive force with respect to the adherend.
  • Examples of the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 12 include acrylic pressure-sensitive adhesive, rubber-based pressure-sensitive adhesive, silicone-based pressure-sensitive adhesive, urethane-based pressure-sensitive adhesive, polyester-based pressure-sensitive adhesive, styrene-diene block copolymer pressure-sensitive adhesive, and vinyl. Examples thereof include, but are not limited to, alkyl ether-based pressure-sensitive adhesives, polyamide-based pressure-sensitive adhesives, and fluorine-based pressure-sensitive adhesives. In addition, these pressure-sensitive adhesives may be used alone or in combination of two or more.
  • the thickness of the pressure-sensitive adhesive layer 12 is, for example, 10 ⁇ m or more and 100 ⁇ m or less, but is not limited thereto.
  • the release liner 100 has a structure in which the polyolefin layer 110 and the polyolefin layer 120 are laminated on the cast coated paper 130 from both sides in the thickness direction.
  • the release liner 100 on the side of the polyolefin layer 110 for example, rubber-based elastomers such as silicone, olefin-based resin, isoprene-based resin, and butadiene-based resin, long-chain alkyl-based resin, and long-chain alkyl acrylate.
  • the release agent layer may be formed by a release agent such as a based resin, an alkyd resin, or a fluororesin, but the present invention is not limited to this. If the polyolefin layer 110 is formed by a copolymer of a release agent and a polyolefin resin as exemplified here, the polyolefin layer 110 itself can exhibit good peelability even without the release agent layer.
  • the polyolefin layers 110 and 120 are layers in which the polyolefin resin is the main component of the resin contained in the layer.
  • the main component refers to a resin contained in an amount of 60% by mass or more (upper limit 100% by mass), preferably 75% by mass or more (upper limit 100% by mass), and 85% by mass or more (upper limit 100% by mass). It is more preferably contained (100% by mass), and most preferably 95% by mass or more (upper limit 100% by mass).
  • polyolefin resin forming the polyolefin layers 110 and 120 examples include polyethylene, polypropylene, and polymethylpentene. Since the polyolefin layer 110 is provided with the convex portion 111, it is preferably formed of polyethylene from the viewpoint of processability.
  • the thickness (maximum thickness) of the polyolefin layers 110 and 120 is not particularly limited, but is, for example, 5 ⁇ m or more and 50 ⁇ m or less.
  • the cast coated paper 130 has a structure in which the paper base material 131, the clay coat layer 132 (sealing layer), and the cast coat layer 133 are laminated in this order.
  • the paper base material 131 is formed of wood pulp.
  • Wood pulp includes N material and L material.
  • N material is wood pulp made from softwood, and its fibers are thick and long.
  • L material is wood pulp made from hardwood, and its fibers are thin and short.
  • the paper base material 131 contains the N material and the L material so that the ratio of the latter is larger than that of the former, or the paper base material 131 is made of the L material without containing the N material.
  • the ratio of N material to L material in the paper base material 131 N material / L material is 0 or more and 2/3 or less in terms of mass ratio.
  • the paper base material 131 is composed of the L material without including the N material.
  • the thickness of the paper base material 131 is not particularly limited, but is, for example, 80 ⁇ m or more and 150 ⁇ m or less.
  • the clay coat layer 132 contains clay and a binder resin. Further, the clay coat layer 132 may contain other additives in addition to the clay and the binder resin.
  • Examples of the clay contained in the clay coat layer 132 include, but are not limited to, kaolin, talc, bentonite, smectite, vermiculite, mica, chlorite, kibushi clay, gairome clay, and halloysite. These clays may be used alone or in combination of two or more.
  • the binder resin contained in the clay coat layer 132 is not particularly limited, and for example, a styrene-butadiene copolymer, an ethylene-vinyl chloride copolymer, a methyl methacrylate-butadiene copolymer, an ethylene-vinyl acetate copolymer, ( Meta) Emulsion of a copolymer such as an acrylic acid ester copolymer; examples thereof include water-soluble resins such as casein, dextrin, starch, oxidized starch, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose and polyvinyl alcohol. These binder resins may be used alone or in combination of two or more.
  • Additives contained in the clay coat layer 132 other than the clay and the binder resin are not particularly limited, and are, for example, pigments, pigment dispersants, defoamers, foam inhibitors, viscosity modifiers, lubricants, water resistant agents, and water retention agents. Examples include agents and coloring materials.
  • the clay coat layer 132 is given as an example of the sealing layer, but the sealing layer of the present invention is not limited to the clay coat layer 132, and does not contain clay and is a binder as described in the previous step. It may be a resin layer formed of a resin. Further, such a resin layer may contain additives as mentioned in the previous stage.
  • the cast coat layer 133 contains a pigment and a binder resin. Further, the cast coat layer 133 may contain other additives in addition to the pigment and the binder resin.
  • Examples of the pigment contained in the cast coat layer 133 include kaolin, calcined kaolin, calcium carbonate, talc, aluminum hydroxide, titanium dioxide, barium sulfate, zinc oxide, satin white, aluminum silicate, magnesium silicate, and synthetic amorphous silica. However, it is not limited to these. These pigments may be used alone or in combination of two or more.
  • the binder resin contained in the cast coat layer 133 is not particularly limited, and for example, the resins listed above can be used as the binder resin contained in the clay coat layer 132, or one kind of resin can be used alone. Also, two or more kinds of resins may be used in combination.
  • the additives contained in the cast coat layer 133 other than the pigment and the binder resin are not particularly limited, and examples thereof include pigment dispersants, mold release agents, defoamers, viscosity modifiers, water resistant agents, and preservatives. ..
  • the cast coated paper 130 is produced by forming the clay coat layer 132 on the paper base material 131 and then forming the cast coat layer 133.
  • the clay coat layer 132 is formed by applying a coating liquid prepared by diluting clay and a binder resin with an arbitrary suitable solvent to a paper base material 131 and drying the coating liquid. Calendar processing is applied.
  • the coating method is not particularly limited, and examples thereof include a roll coating method, a gravure coating method, a reverse coating method, a roll brushing method, a spray coating method, an air knife coating method, an impregnation method, and a curtain coating method. Can be mentioned.
  • the cast coat layer 133 is formed by applying a coating liquid prepared by diluting a pigment and a binder resin with an appropriate solvent to the clay coat layer 132 by a coating method as described above to form a coating film. It is formed by drying while pressing the coating film with a heated metal mirror surface drum (cast drum).
  • the coating film may be dried by a mirror surface drum in a wet state, may be dried by a mirror surface drum after being passed through a coagulating liquid to be in a gelled state, or may be dried once and then rewetted. It may be returned to a wet state with a liquid and then dried with a mirror-finished drum. Since the cast coat layer 133 is formed while being pressed by the mirror surface drum (cast drum), it has excellent smoothness and exhibits a strong luster.
  • the polyolefin layers 110 and 120 are formed.
  • the polyolefin layer 110 is formed on the surface of the cast-coated paper 130 on the side of the cast-coated layer 133, and the polyolefin layer 120 is formed on the surface of the opposite side of the cast-coated paper 130.
  • the polyolefin layer 120 is formed, but the order of formation is not limited.
  • the polyolefin layers 110 and 120 are formed, for example, by a melt extrusion method.
  • the convex portion 111 is formed by, for example, embossing the layer of the polyolefin resin formed by the melt extrusion method, preferably before the polyolefin resin is solidified.
  • the embossed roll having the concave portion formed on the outer peripheral surface is pressed against the layer of the polyolefin resin, and the concave portion on the outer peripheral surface of the embossed roll is inverted and transferred to the polyolefin resin, and as a result, the convex portion 111 is formed. Is done.
  • the pressure-sensitive adhesive layer 12 is formed on the surface provided with the convex portion 111, and the base material layer 11 and the release liner 100 are bonded to each other via the pressure-sensitive adhesive layer 12. As a result, the adhesive sheet 10 is produced.
  • the pressure-sensitive adhesive layer 12 is formed, for example, by applying the pressure-sensitive adhesive composition to the surface of the release liner 100 provided with the convex portion 111 and drying the pressure-sensitive adhesive composition.
  • How the pressure-sensitive adhesive composition is applied is not particularly limited, and is known, for example, a roll coater, a knife coater, an air knife coater, a bar coater, a blade coater, a slot die coater, a lip coater, a gravure coater, or the like. It can be applied using an apparatus.
  • cast coated paper 130 is used for the release liner 100.
  • the cast coat layer 133 on the surface is formed while being pressed by a mirror surface drum (cast drum). Therefore, the cast coat layer 133 is particularly excellent in smoothness as compared with a general coat layer. Has sex.
  • the paper base material 131 formed of wood pulp contains a large amount of L material, which makes it difficult for the paper base material 131 itself to form a formation. ..
  • Wood pulp includes N material in addition to L material, but in N material, the directions of the fibers are relatively aligned, and when the water content increases or decreases as the coating liquid is applied and dried in the process of forming the coat layer. , Dense and sparse fibers are likely to be formed, and such uneven fiber density tends to cause "waviness" that causes formation.
  • each microscopic fiber can also be a factor in causing formation, but N material is ground because the fibers are thick and long. It is easy to cause a match.
  • the directions of the fibers are different and the fiber density is less uneven, so that it is difficult to generate "waviness". Thin and short. Therefore, the paper base material 131 itself is unlikely to cause formation.
  • the formation of the release liner 100 is effectively suppressed by the characteristics of the cast coat layer 133 having excellent smoothness and the paper base material 131 itself containing a large amount of L material, so that the release liner 100 is peeled off. Even if the liner 100 and the base material layer 11 are bonded to each other, the formation of the release liner 100 is unlikely to be transferred to the base material layer 11, and traces of the formation are unlikely to remain on the adhesive sheet 10.
  • the release liner 100 has a clay coat layer 132 (sealing layer) between the paper base material 131 and the cast coat layer 133, and is applied when the cast coat layer 133 is formed. It is suppressed that the coating liquid permeates into the paper base material 131.
  • the coating liquid soaks into the paper base material 131, the texture of the paper base material 131 may emerge on the surface of the coating film and the cast coat layer 133.
  • the clay coat layer 132 (eyes) The stop layer) closes the gaps between the fibers on the surface of the paper base material 131 and suppresses the penetration of such a coating liquid, so that the smoothness of the cast coat layer 133 can be further improved.
  • the release liner 100 is difficult to curl.
  • the base material layer 11 and the release liner 100 are bonded to each other by forming an adhesive layer 12 on the release liner 100 side. Also includes a form in which the pressure-sensitive adhesive layer 12 is formed on the base material layer 11 side, and the base material layer 11 and the release liner 100 are bonded to each other.
  • the cast coated paper preferably has a sealing layer between the cast coat layer and the paper base material, but the present invention is not limited to this.
  • the scope of the present invention also includes a form in which there is no sealing layer between the cast coat layer and the paper base material and the cast coat layer is directly laminated on the paper base material.
  • the shape of the adhesive sheet is not particularly limited, and may be, for example, a rectangular shape such as a square or a rectangle, a long shape, or a shape corresponding to the shape of the adherend. There may be.
  • Adhesive sheet 11 base material layer, 12 Adhesive layer, 13 recess, 100 peeling liner, 110 Polyolefin layer, 111 convex part, 120 polyolefin layer, 130 cast coated paper, 131 Paper substrate, 132 Clay coat layer (sealing layer), 133 Cast coat layer.

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Abstract

[Problem] To provide a release liner that is not susceptible to leaving texture marks, an adhesive sheet, and a method for manufacturing the adhesive sheet. [Solution] A release liner 100 comprises a polyolefin layer 110, the surface of which is provided with consecutive protrusions 111, and a cast coated paper130 on which the polyolefin layer is laminated. The paper base material 131, on which the cast coated layer 133 that forms the surface layer of the cast coated paper is laminated, is formed from wood pulp and is such that the ratio N material/L material of the N material to the L material is 0-2/3 in terms of mass ratio.

Description

剥離ライナー、粘着シート、および粘着シートの作製方法How to make a release liner, an adhesive sheet, and an adhesive sheet
　本発明は、剥離ライナー、粘着シート、および粘着シートの作製方法に関する。 The present invention relates to a release liner, an adhesive sheet, and a method for producing an adhesive sheet.
　従来、自動車、家電、家具等の表面に貼付され装飾を付与する高光沢の粘着シートがあり、例えば特許文献１では、高光沢な基材層、粘着剤層、および剥離ライナーが積層された粘着シートが開示されている。このような粘着シートは、剥離ライナーを剥がされ、粘着剤層を介して被着体に貼付される。 Conventionally, there is a high-gloss adhesive sheet that is attached to the surface of automobiles, home appliances, furniture, etc. to give decoration. For example, in Patent Document 1, a high-gloss base material layer, an adhesive layer, and a release liner are laminated. The sheet is disclosed. Such an adhesive sheet is peeled off from the release liner and attached to the adherend via the adhesive layer.
　その際、粘着シートと被着体との間に空気が入り込み、いわゆる「ふくれ」が生じることがあるが、剥離ライナーの表面に連続する凸部を設け、これによって、対応する凹部を粘着剤層に形成すれば、凹部を通じて空気が排出されるため、ふくれを抑制できる。 At that time, air may enter between the adhesive sheet and the adherend to cause so-called "blister", but a continuous convex portion is provided on the surface of the release liner, whereby the corresponding concave portion is formed into the adhesive layer. If it is formed in, air is discharged through the recess, so that blistering can be suppressed.
特開２００７－２６９９２８号公報JP-A-2007-269928
　しかしながら、紙の剥離ライナーに凸部が設けられる場合、ふくれは抑制されるものの、剥離ライナーを形成する紙の地合によって、粘着シートの基材層に跡が残ることがあり、特に高光沢の粘着シートでは、そのような跡が残ってしまうと目立ち易いため、好ましくない。 However, when the release liner of the paper is provided with a convex portion, although blistering is suppressed, a mark may be left on the base material layer of the adhesive sheet depending on the texture of the paper forming the release liner, which is particularly high gloss. Adhesive sheets are not preferable because such marks are easily noticeable if they remain.
　そこで、本発明は、地合の跡を残し難い剥離ライナー、粘着シート、および粘着シートの作製方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a release liner, an adhesive sheet, and a method for producing an adhesive sheet that do not easily leave traces of formation.
　上記目的を達成するための本発明の剥離ライナーは、連続する凸部が表面に設けられたポリオレフィン層と、当該ポリオレフィン層が積層されたキャストコート紙と、を有する。前記キャストコート紙において表層をなすキャストコート層が積層されている紙基材は、木材パルプによって形成されており、Ｎ材とＬ材との比率Ｎ材／Ｌ材が、質量比で０以上２／３以下である。 The release liner of the present invention for achieving the above object has a polyolefin layer provided with continuous convex portions on the surface, and a cast coated paper on which the polyolefin layer is laminated. In the cast-coated paper, the paper base material on which the cast coat layer forming the surface layer is laminated is formed of wood pulp, and the ratio of N material to L material is 0 or more in terms of mass ratio of N material / L material. It is less than / 3rd.
　上記目的を達成するための本発明の粘着シートは、ＪＩＳ　Ｚ８７４１－１９９７（ＩＳＯ　２８１３：１９９４）に準拠した鏡面光沢度Ｇｓ（６０°）が、６０％以上である基材層と、粘着剤層と、上記剥離ライナーと、を積層方向にこの順序で有する。 The pressure-sensitive adhesive sheet of the present invention for achieving the above object is a base material layer having a mirror glossiness Gs (60 °) of 60% or more according to JIS Z8741-1997 (ISO 2813: 1994), and a pressure-sensitive adhesive layer. And the release liner are provided in this order in the stacking direction.
　上記目的を達成するための本発明の粘着シートの作製方法は、ＪＩＳ　Ｚ８７４１－１９９７に準拠した鏡面光沢度Ｇｓ（６０°）が、６０％以上である基材層、および、上記剥離ライナーのうち、少なくとも一方に粘着剤層を形成し、前記粘着剤層を介して、前記基材層と前記剥離ライナーとを張り合わせる。 The method for producing the pressure-sensitive adhesive sheet of the present invention for achieving the above object is among the base material layer having a mirror glossiness Gs (60 °) of 60% or more according to JIS Z8741-1997 and the release liner. A pressure-sensitive adhesive layer is formed on at least one of the layers, and the base material layer and the release liner are bonded to each other via the pressure-sensitive adhesive layer.
　上記構成を有する発明において、剥離ライナーに用いられるキャストコート紙は、表面のキャストコート層の平滑性が優れており、それだけでなくさらに、木材パルプによって形成された紙基材自体が、Ｌ材を多く含むことによって、地合を生じ難くなっている。それらのことから、剥離ライナーの地合が効果的に抑制されるため、粘着シートに地合の跡が残り難い。 In the invention having the above structure, the cast coated paper used for the release liner has excellent smoothness of the cast coat layer on the surface, and further, the paper base material itself formed of wood pulp is an L material. By including a large amount, it is difficult to form a formation. As a result, the formation of the release liner is effectively suppressed, and it is difficult for traces of formation to remain on the adhesive sheet.
実施形態の粘着シートを示す斜視図である。It is a perspective view which shows the adhesive sheet of an embodiment. 剥離ライナーを剥がした状態で実施形態の粘着シートを示す斜視図である。It is a perspective view which shows the adhesive sheet of embodiment in the state which peeled off the release liner. 実施形態の剥離ライナーを示す側面図である。It is a side view which shows the release liner of an embodiment. 粘着剤層を介した基材層と剥離ライナーとの張り合わせを示す側面図である。It is a side view which shows the bonding of a base material layer and a release liner via an adhesive layer.
　以下、添付した図面を参照しながら、本発明の実施形態を説明する。なお、図面の寸法比率は、説明の都合上誇張されており、実際の比率とは異なる。 Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. The dimensional ratios in the drawings are exaggerated for convenience of explanation and differ from the actual ratios.
　図１に示すように、実施形態の粘着シート１０は、基材層１１と、粘着剤層１２と、剥離ライナー１００と、を積層方向にこの順序で有する。粘着シート１０は、例えば、自動車、家電、家具等の被着体の表面を装飾する高光沢な加飾シートであり、例えば塗装の代わりとして使用できる。 As shown in FIG. 1, the pressure-sensitive adhesive sheet 10 of the embodiment has a base material layer 11, a pressure-sensitive adhesive layer 12, and a release liner 100 in this order in the stacking direction. The adhesive sheet 10 is, for example, a high-gloss decorative sheet that decorates the surface of an adherend such as an automobile, a home appliance, or furniture, and can be used as a substitute for painting, for example.
　図２に示すように、粘着シート１０は、剥離ライナー１００を剥がして使用され、粘着剤層１２を介して被着体に貼付される。剥離ライナー１００のうち、粘着剤層１２と接する面には、剥離剤によって剥離剤層が形成されていてもよい。剥離ライナー１００は凸部１１１を有しており、これに対応して粘着剤層１２に凹部１３が形成される。 As shown in FIG. 2, the adhesive sheet 10 is used by peeling off the release liner 100, and is attached to the adherend via the adhesive layer 12. A release agent layer may be formed on the surface of the release liner 100 in contact with the pressure-sensitive adhesive layer 12. The release liner 100 has a convex portion 111, and a concave portion 13 is formed in the pressure-sensitive adhesive layer 12 corresponding to the convex portion 111.
　凸部１１１は、連続しており、直線状に延びているが、これに限定されず、曲がっていてもよい。また、凸部１１１の数も特に限定されない。また、図示した例では、複数の凸部１１１同士が、互いに平行に延びているが、これに限定されず、複数の凸部１１１同士が、例えば格子状に交差している形態も、本発明の範囲に含まれる。 The convex portion 111 is continuous and extends in a straight line, but the present invention is not limited to this, and the convex portion 111 may be bent. Further, the number of convex portions 111 is not particularly limited. Further, in the illustrated example, the plurality of convex portions 111 extend in parallel with each other, but the present invention is not limited to this, and a form in which the plurality of convex portions 111 intersect each other in a grid pattern, for example, is also present invention. Is included in the range of.
　また、凸部１１１は、剥離ライナー１００の厚み方向の断面において、三角形の断面形状を有するが、これに限定されない。同断面において、凸部１１１は、例えば、矩形形状（正方形、長方形）、台形形状、または半楕円形状等の他の断面形状を有してもよい。凹部１３は、凸部１１１の形状が反転した形状を有する。 Further, the convex portion 111 has a triangular cross-sectional shape in the cross-sectional shape of the release liner 100 in the thickness direction, but the present invention is not limited to this. In the same cross section, the convex portion 111 may have another cross-sectional shape such as a rectangular shape (square, rectangular), a trapezoidal shape, or a semi-elliptical shape. The concave portion 13 has a shape in which the shape of the convex portion 111 is inverted.
　粘着シート１０は、粘着剤層１２に溝状の凹部１３が形成されているため、被着体に貼付される際に空気が被着体との間に入り込んだとしても、凹部１３を通じて空気が排出され、ふくれを抑制できる。 Since the pressure-sensitive adhesive sheet 10 has a groove-shaped recess 13 formed in the pressure-sensitive adhesive layer 12, even if air enters between the adherend and the adherend when the pressure-sensitive adhesive sheet 10 is attached to the adherend, the air can pass through the recess 13. It is discharged and can suppress blisters.
　粘着シート１０は、基材層１１に付与されている色および光沢によって、被着体を装飾する。また、基材層１１に柄が付与されていてもよい。基材層１１のうち、粘着剤層１２と反対側の表面では、ＪＩＳ　Ｚ８７４１－１９９７に準拠した鏡面光沢度Ｇｓ（６０°）が、６０％以上である。ここで、鏡面光沢度Ｇｓ（６０°）の上限値は、特に限定されないが、例えば１２０％である。鏡面光沢度Ｇｓ（６０°）は、例えば、日本電色工業（株）製グロスメーター「ＶＧ７０００」によって測定できる。 The adhesive sheet 10 decorates the adherend with the color and luster imparted to the base material layer 11. Further, the base material layer 11 may be provided with a handle. On the surface of the base material layer 11 opposite to the pressure-sensitive adhesive layer 12, the mirror glossiness Gs (60 °) according to JIS Z8741-1997 is 60% or more. Here, the upper limit of the mirror glossiness Gs (60 °) is not particularly limited, but is, for example, 120%. The mirror glossiness Gs (60 °) can be measured by, for example, a gloss meter “VG7000” manufactured by Nippon Denshoku Kogyo Co., Ltd.
　基材層１１は、好ましくは、着色剤と樹脂とを含む。基材層１１の厚みは、特に限定されないが、例えば、５０μｍ以上２００μｍ以下である。 The base material layer 11 preferably contains a colorant and a resin. The thickness of the base material layer 11 is not particularly limited, but is, for example, 50 μm or more and 200 μm or less.
　基材層１１を形成する樹脂としては、例えば、ポリウレタン、ポリオレフィン、ポリ塩化ビニル、エチレン－酢酸ビニル共重合体等が挙げられる。 Examples of the resin forming the base material layer 11 include polyurethane, polyolefin, polyvinyl chloride, ethylene-vinyl acetate copolymer and the like.
　基材層１１に含まれる着色剤としては、例えば、カーボンブラック（ファーネスブラック、チャンネルブラック、アセチレンブラック、サーマルブラック、ランプブラック、松煙等）、グラファイト（黒鉛）、酸化銅、二酸化マンガン、アニリンブラック、ペリレンブラック、チタンブラック、シアニンブラック、活性炭、フェライト（非磁性フェライト、磁性フェライト等）、マグネタイト、酸化クロム、酸化鉄、二硫化モリブデン、クロム錯体、複合酸化物系黒色色素、アントラキノン系有機黒色色素などが挙げられる。 Examples of the colorant contained in the base material layer 11 include carbon black (furness black, channel black, acetylene black, thermal black, lamp black, pine smoke, etc.), graphite (graphite), copper oxide, manganese dioxide, and aniline black. , Perylene black, titanium black, cyanine black, activated carbon, ferrite (non-magnetic ferrite, magnetic ferrite, etc.), magnetite, chromium oxide, iron oxide, molybdenum disulfide, chromium complex, composite oxide black dye, anthraquinone organic black dye And so on.
　基材層１１は、光沢を調整可能なクリア層を、粘着剤層１２と反対側の表面に有してもよい。クリア層を形成する樹脂としては、例えば、フッ素樹脂；ポリウレタン；アクリル系ポリマー；ポリ塩化ビニル；ポリエチレン、ポリプロピレン等のポリオレフィン；オレフィン系、ポリエステル系等の熱可塑性エラストマー；アイオノマーなどの樹脂を使用できる。 The base material layer 11 may have a clear layer whose gloss can be adjusted on the surface opposite to the pressure-sensitive adhesive layer 12. As the resin forming the clear layer, for example, fluororesin; polyurethane; acrylic polymer; polyvinyl chloride; polyolefin such as polyethylene and polypropylene; thermoplastic elastomer such as olefin and polyester; and resin such as ionomer can be used.
　また、基材層１１は、必要に応じ、安定剤（例えば、Ｂａ－Ｚｎ系等）、滑剤、充填剤、加工助剤、可塑剤、軟化剤、金属粉、防曇剤、紫外線散乱剤または紫外線吸収剤等の紫外線遮蔽剤、酸化防止剤、帯電防止剤、難撚剤などを適宜含んでもよい。 Further, the base material layer 11 may be a stabilizer (for example, Ba—Zn type, etc.), a lubricant, a filler, a processing aid, a plasticizer, a softener, a metal powder, an antifogging agent, an ultraviolet scattering agent, or the like, if necessary. An ultraviolet shielding agent such as an ultraviolet absorber, an antioxidant, an antistatic agent, a hard-twisting agent and the like may be appropriately contained.
　粘着剤層１２は、被着体に対して所望の接着力を発揮できればよく、特に限定されない。粘着剤層１２を形成する粘着剤としては、例えば、アクリル系粘着剤、ゴム系粘着剤、シリコーン系粘着剤、ウレタン系粘着剤、ポリエステル系粘着剤、スチレン－ジエンブロック共重合体粘着剤、ビニルアルキルエーテル系粘着剤、ポリアミド系粘着剤、フッ素系粘着剤などが挙げられるが、これらに限定されない。また、これらの粘着剤は、１種単独で用いても２種以上併用してもよい。粘着剤層１２の厚みは、例えば１０μｍ以上１００μｍ以下であるが、これに限定されない。 The pressure-sensitive adhesive layer 12 is not particularly limited as long as it can exhibit a desired adhesive force with respect to the adherend. Examples of the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 12 include acrylic pressure-sensitive adhesive, rubber-based pressure-sensitive adhesive, silicone-based pressure-sensitive adhesive, urethane-based pressure-sensitive adhesive, polyester-based pressure-sensitive adhesive, styrene-diene block copolymer pressure-sensitive adhesive, and vinyl. Examples thereof include, but are not limited to, alkyl ether-based pressure-sensitive adhesives, polyamide-based pressure-sensitive adhesives, and fluorine-based pressure-sensitive adhesives. In addition, these pressure-sensitive adhesives may be used alone or in combination of two or more. The thickness of the pressure-sensitive adhesive layer 12 is, for example, 10 μm or more and 100 μm or less, but is not limited thereto.
　図３に示すように、剥離ライナー１００は、キャストコート紙１３０に対し、厚み方向両側から、ポリオレフィン層１１０、およびポリオレフィン層１２０が積層された構成を有する。 As shown in FIG. 3, the release liner 100 has a structure in which the polyolefin layer 110 and the polyolefin layer 120 are laminated on the cast coated paper 130 from both sides in the thickness direction.
　また、剥離ライナー１００の表面のうち、ポリオレフィン層１１０側の表面には、例えば、シリコーン、オレフィン系樹脂、イソプレン系樹脂、ブタジエン系樹脂等のゴム系エラストマー、長鎖アルキル系樹脂、長鎖アルキルアクリレート系樹脂、アルキド系樹脂、フッ素系樹脂などの剥離剤によって、剥離剤層が形成されていてもよいが、これに限定されない。ここで例示したような剥離剤とポリオレフィン樹脂との共重合体によってポリオレフィン層１１０を形成すれば、剥離剤層がなくても、ポリオレフィン層１１０自体が、良好な剥離性を発揮できる。 Further, on the surface of the release liner 100 on the side of the polyolefin layer 110, for example, rubber-based elastomers such as silicone, olefin-based resin, isoprene-based resin, and butadiene-based resin, long-chain alkyl-based resin, and long-chain alkyl acrylate. The release agent layer may be formed by a release agent such as a based resin, an alkyd resin, or a fluororesin, but the present invention is not limited to this. If the polyolefin layer 110 is formed by a copolymer of a release agent and a polyolefin resin as exemplified here, the polyolefin layer 110 itself can exhibit good peelability even without the release agent layer.
　ポリオレフィン層１１０、１２０は、ポリオレフィン樹脂が層中に含まれる樹脂の主成分である層である。ここで、主成分とは、樹脂に対して６０質量％以上（上限１００質量％）含まれる樹脂を指し、７５質量％以上（上限１００質量％）含まれることが好ましく、８５質量％以上（上限１００質量％）含まれることがより好ましく、９５質量％以上（上限１００質量％）含まれることが最も好ましい。 The polyolefin layers 110 and 120 are layers in which the polyolefin resin is the main component of the resin contained in the layer. Here, the main component refers to a resin contained in an amount of 60% by mass or more (upper limit 100% by mass), preferably 75% by mass or more (upper limit 100% by mass), and 85% by mass or more (upper limit 100% by mass). It is more preferably contained (100% by mass), and most preferably 95% by mass or more (upper limit 100% by mass).
　ポリオレフィン層１１０、１２０を形成するポリオレフィン樹脂としては、例えば、ポリエチレン、ポリプロピレン、ポリメチルペンテンが挙げられる。ポリオレフィン層１１０は、凸部１１１が設けられるため、加工性の観点から、ポリエチレンによって形成されることが好ましい。ポリオレフィン層１１０、１２０の厚み（最大厚み）は、特に限定されないが、例えば、５μｍ以上５０μｍ以下である。 Examples of the polyolefin resin forming the polyolefin layers 110 and 120 include polyethylene, polypropylene, and polymethylpentene. Since the polyolefin layer 110 is provided with the convex portion 111, it is preferably formed of polyethylene from the viewpoint of processability. The thickness (maximum thickness) of the polyolefin layers 110 and 120 is not particularly limited, but is, for example, 5 μm or more and 50 μm or less.
　キャストコート紙１３０は、紙基材１３１、クレーコート層１３２（目止め層）、およびキャストコート層１３３が、この順序で積層された構成を有する。 The cast coated paper 130 has a structure in which the paper base material 131, the clay coat layer 132 (sealing layer), and the cast coat layer 133 are laminated in this order.
　紙基材１３１は、木材パルプによって形成されている。木材パルプとしては、Ｎ材およびＬ材がある。Ｎ材は、針葉樹を原料とする木材パルプであり、繊維が太く長い。一方、Ｌ材は、広葉樹を原料とする木材パルプであり、繊維が細く短い。紙基材１３１は、Ｎ材およびＬ材を、前者よりも後者の割合が多くなるように含む、あるいは、Ｎ材を含まずＬ材からなる。 The paper base material 131 is formed of wood pulp. Wood pulp includes N material and L material. N material is wood pulp made from softwood, and its fibers are thick and long. On the other hand, L material is wood pulp made from hardwood, and its fibers are thin and short. The paper base material 131 contains the N material and the L material so that the ratio of the latter is larger than that of the former, or the paper base material 131 is made of the L material without containing the N material.
　具体的に、紙基材１３１におけるＮ材とＬ材との比率Ｎ材／Ｌ材は、質量比で０以上２／３以下である。ここでＮ材／Ｌ材が０の場合、紙基材１３１は、Ｎ材を含まずＬ材から構成される。紙基材１３１の厚みは、特に限定されないが、例えば８０μｍ以上１５０μｍ以下である。 Specifically, the ratio of N material to L material in the paper base material 131 N material / L material is 0 or more and 2/3 or less in terms of mass ratio. Here, when the N material / L material is 0, the paper base material 131 is composed of the L material without including the N material. The thickness of the paper base material 131 is not particularly limited, but is, for example, 80 μm or more and 150 μm or less.
　クレーコート層１３２は、クレーおよびバインダー樹脂を含む。また、クレーコート層１３２は、クレーおよびバインダー樹脂以外にも、他の添加物を含んでもよい。 The clay coat layer 132 contains clay and a binder resin. Further, the clay coat layer 132 may contain other additives in addition to the clay and the binder resin.
　クレーコート層１３２に含まれるクレーとしては、例えば、カオリン、タルク、ベントナイト、スメクタイト、バーミキュライト、雲母、緑泥石、木節粘土、ガイロメ粘土、ハロイサイト等が挙げられるが、これらに限定されない。これらのクレーは、１種単独で用いても２種以上併用してもよい。 Examples of the clay contained in the clay coat layer 132 include, but are not limited to, kaolin, talc, bentonite, smectite, vermiculite, mica, chlorite, kibushi clay, gairome clay, and halloysite. These clays may be used alone or in combination of two or more.
　クレーコート層１３２に含まれるバインダー樹脂は、特に限定されないが、例えば、スチレン－ブタジエン共重合体、エチレン－塩化ビニル共重合体、メチルメタクリレート－ブタジエン共重合体、エチレン－酢酸ビニル共重合体、（メタ）アクリル酸エステル共重合体等の共重合体のエマルション；カゼイン、デキストリン、デンプン、酸化デンプン、カルボキシメチルセルロース、メチルセルロース、エチルセルロース、ヒドロキシエチルセルロース、ポリビニルアルコール等の水溶性樹脂などが挙げられる。これらのバインダー樹脂は、１種単独で用いても２種以上併用してもよい。 The binder resin contained in the clay coat layer 132 is not particularly limited, and for example, a styrene-butadiene copolymer, an ethylene-vinyl chloride copolymer, a methyl methacrylate-butadiene copolymer, an ethylene-vinyl acetate copolymer, ( Meta) Emulsion of a copolymer such as an acrylic acid ester copolymer; examples thereof include water-soluble resins such as casein, dextrin, starch, oxidized starch, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose and polyvinyl alcohol. These binder resins may be used alone or in combination of two or more.
　クレーおよびバインダー樹脂以外にクレーコート層１３２に含まれる添加物は、特に限定されないが、例えば、顔料、顔料分散剤、消泡剤、発泡防止剤、粘度調整剤、潤滑剤、耐水化剤、保水剤、色材などが挙げられる。 Additives contained in the clay coat layer 132 other than the clay and the binder resin are not particularly limited, and are, for example, pigments, pigment dispersants, defoamers, foam inhibitors, viscosity modifiers, lubricants, water resistant agents, and water retention agents. Examples include agents and coloring materials.
　本実施形態では、クレーコート層１３２を目止め層の一例として挙げたが、本発明の目止め層は、クレーコート層１３２に限定されず、クレーを含まず前々段で挙げたようなバインダー樹脂によって形成された樹脂層であってもよい。また、このような樹脂層は、前段で挙げたような添加物を含んでいてもよい。 In the present embodiment, the clay coat layer 132 is given as an example of the sealing layer, but the sealing layer of the present invention is not limited to the clay coat layer 132, and does not contain clay and is a binder as described in the previous step. It may be a resin layer formed of a resin. Further, such a resin layer may contain additives as mentioned in the previous stage.
　キャストコート層１３３は、顔料およびバインダー樹脂を含む。また、キャストコート層１３３は、顔料およびバインダー樹脂以外にも、他の添加物を含んでもよい。 The cast coat layer 133 contains a pigment and a binder resin. Further, the cast coat layer 133 may contain other additives in addition to the pigment and the binder resin.
　キャストコート層１３３に含まれる顔料としては、例えば、カオリン、焼成カオリン、炭酸カルシウム、タルク、水酸化アルミニウム、二酸化チタン、硫酸バリウム、酸化亜鉛、サチンホワイト、珪酸アルミニウム、珪酸マグネシウム、合成非晶質シリカなどが挙げられるが、これらに限定されない。これらの顔料は、１種単独で用いても２種以上併用してもよい。 Examples of the pigment contained in the cast coat layer 133 include kaolin, calcined kaolin, calcium carbonate, talc, aluminum hydroxide, titanium dioxide, barium sulfate, zinc oxide, satin white, aluminum silicate, magnesium silicate, and synthetic amorphous silica. However, it is not limited to these. These pigments may be used alone or in combination of two or more.
　キャストコート層１３３に含まれるバインダー樹脂は、特に限定されず、例えば、クレーコート層１３２に含まれるバインダー樹脂として上に挙げた樹脂を用いることができ、また、１種の樹脂を単独で用いても２種以上の樹脂を併用してもよい。 The binder resin contained in the cast coat layer 133 is not particularly limited, and for example, the resins listed above can be used as the binder resin contained in the clay coat layer 132, or one kind of resin can be used alone. Also, two or more kinds of resins may be used in combination.
　顔料およびバインダー樹脂以外にキャストコート層１３３に含まれる添加物は、特に限定されないが、例えば、顔料分散剤、離型剤、消泡剤、粘度調整剤、耐水化剤、防腐剤などが挙げられる。 The additives contained in the cast coat layer 133 other than the pigment and the binder resin are not particularly limited, and examples thereof include pigment dispersants, mold release agents, defoamers, viscosity modifiers, water resistant agents, and preservatives. ..
　キャストコート紙１３０は、紙基材１３１にクレーコート層１３２を形成し、その後、キャストコート層１３３を形成して作製される。 The cast coated paper 130 is produced by forming the clay coat layer 132 on the paper base material 131 and then forming the cast coat layer 133.
　クレーコート層１３２は、クレーおよびバインダー樹脂を任意の適切な溶媒で希釈して調製した塗工液を、紙基材１３１に塗布し、これを乾燥して形成され、塗工液の乾燥後、カレンダー加工が施される。塗工液の塗布方法は、特に限定されず、例えば、ロールコート法、グラビアコート法、リバースコート法、ロ一ルブラッシュ法、スプレーコート法、エアーナイフコート法、含浸法、カーテンコート法などが挙げられる。 The clay coat layer 132 is formed by applying a coating liquid prepared by diluting clay and a binder resin with an arbitrary suitable solvent to a paper base material 131 and drying the coating liquid. Calendar processing is applied. The coating method is not particularly limited, and examples thereof include a roll coating method, a gravure coating method, a reverse coating method, a roll brushing method, a spray coating method, an air knife coating method, an impregnation method, and a curtain coating method. Can be mentioned.
　キャストコート層１３３は、顔料およびバインダー樹脂を任意の適切な溶媒で希釈して調製した塗工液を、上で挙げたような塗布方法によってクレーコート層１３２に塗布して塗膜を形成し、加熱された金属製の鏡面ドラム（キャストドラム）によって塗膜を押圧しつつ乾燥させて形成される。ここで、塗膜は、湿潤状態のまま鏡面ドラムによって乾燥させてもよいし、凝固液中に通してゲル化状態にした後に鏡面ドラムによって乾燥させてもよいし、一旦乾燥させた後に再湿潤液によって湿潤状態に戻し、その後、鏡面ドラムによって乾燥させてもよい。キャストコート層１３３は、鏡面ドラム（キャストドラム）によって押圧されつつ形成されるため、優れた平滑性を有し、強い光沢を示す。 The cast coat layer 133 is formed by applying a coating liquid prepared by diluting a pigment and a binder resin with an appropriate solvent to the clay coat layer 132 by a coating method as described above to form a coating film. It is formed by drying while pressing the coating film with a heated metal mirror surface drum (cast drum). Here, the coating film may be dried by a mirror surface drum in a wet state, may be dried by a mirror surface drum after being passed through a coagulating liquid to be in a gelled state, or may be dried once and then rewetted. It may be returned to a wet state with a liquid and then dried with a mirror-finished drum. Since the cast coat layer 133 is formed while being pressed by the mirror surface drum (cast drum), it has excellent smoothness and exhibits a strong luster.
　キャストコート紙１３０の準備後、ポリオレフィン層１１０、１２０が形成される。ポリオレフィン層１１０は、キャストコート紙１３０に対し、キャストコート層１３３側の面に形成され、それとは反対側の面に、ポリオレフィン層１２０が形成される。ポリオレフィン層１２０が形成された後、ポリオレフィン層１１０が形成されるが、この形成順序に限定されない。ポリオレフィン層１１０、１２０は、例えば溶融押出法によって形成される。 After preparing the cast coated paper 130, the polyolefin layers 110 and 120 are formed. The polyolefin layer 110 is formed on the surface of the cast-coated paper 130 on the side of the cast-coated layer 133, and the polyolefin layer 120 is formed on the surface of the opposite side of the cast-coated paper 130. After the polyolefin layer 120 is formed, the polyolefin layer 110 is formed, but the order of formation is not limited. The polyolefin layers 110 and 120 are formed, for example, by a melt extrusion method.
　凸部１１１は、例えば溶融押出法によって形成されるポリオレフィン樹脂の層に対し、好ましくはポリオレフィン樹脂の固化前に、エンボス加工を施すことによって形成される。エンボス加工では、外周面に凹部の形成されたエンボスロールが、ポリオレフィン樹脂の層に押し当てられ、エンボスロールの外周面の凹部が、ポリオレフィン樹脂に反転して転写される結果、凸部１１１が形作られる。 The convex portion 111 is formed by, for example, embossing the layer of the polyolefin resin formed by the melt extrusion method, preferably before the polyolefin resin is solidified. In the embossing process, the embossed roll having the concave portion formed on the outer peripheral surface is pressed against the layer of the polyolefin resin, and the concave portion on the outer peripheral surface of the embossed roll is inverted and transferred to the polyolefin resin, and as a result, the convex portion 111 is formed. Is done.
　図４に示すように、剥離ライナー１００の作製後、凸部１１１の設けられた面に粘着剤層１２が形成され、粘着剤層１２を介して基材層１１と剥離ライナー１００とが張り合わされることによって、粘着シート１０が作製される。粘着剤層１２は、例えば、粘着剤組成物を、剥離ライナー１００の凸部１１１の設けられた面に塗布し、これを乾燥することによって形成される。粘着剤組成物をどのように塗布するかは、特に限定されず、例えば、ロールコーター、ナイフコーター、エアーナイフコーター、バーコーター、ブレードコーター、スロットダイコーター、リップコーター、グラビアコーター等の公知の塗布装置を用いて塗布することができる。 As shown in FIG. 4, after the release liner 100 is manufactured, the pressure-sensitive adhesive layer 12 is formed on the surface provided with the convex portion 111, and the base material layer 11 and the release liner 100 are bonded to each other via the pressure-sensitive adhesive layer 12. As a result, the adhesive sheet 10 is produced. The pressure-sensitive adhesive layer 12 is formed, for example, by applying the pressure-sensitive adhesive composition to the surface of the release liner 100 provided with the convex portion 111 and drying the pressure-sensitive adhesive composition. How the pressure-sensitive adhesive composition is applied is not particularly limited, and is known, for example, a roll coater, a knife coater, an air knife coater, a bar coater, a blade coater, a slot die coater, a lip coater, a gravure coater, or the like. It can be applied using an apparatus.
　次に本実施形態の作用効果を述べる。 Next, the action and effect of this embodiment will be described.
　本実施形態では、剥離ライナー１００にキャストコート紙１３０が用いられている。キャストコート紙１３０において、表面のキャストコート層１３３は、鏡面ドラム（キャストドラム）によって押圧されつつ形成されており、このため、一般的なコート層に比べ、キャストコート層１３３は、特に優れた平滑性を有する。 In this embodiment, cast coated paper 130 is used for the release liner 100. In the cast coated paper 130, the cast coat layer 133 on the surface is formed while being pressed by a mirror surface drum (cast drum). Therefore, the cast coat layer 133 is particularly excellent in smoothness as compared with a general coat layer. Has sex.
　また、本実施形態のキャストコート紙１３０では、木材パルプによって形成された紙基材１３１が、Ｌ材を多く含んでおり、これによって、紙基材１３１自体が、地合を生じ難くなっている。 Further, in the cast-coated paper 130 of the present embodiment, the paper base material 131 formed of wood pulp contains a large amount of L material, which makes it difficult for the paper base material 131 itself to form a formation. ..
　木材パルプとしては、Ｌ材の他にＮ材があるが、Ｎ材は、繊維同士の方向が比較的揃っており、コート層の形成過程で塗工液の塗布・乾燥とともに水分量が増減すると、繊維の密な箇所と疎な箇所とが形成され易く、このような繊維密度の偏りによって、地合の要因となる「うねり」を発生させ易い。 Wood pulp includes N material in addition to L material, but in N material, the directions of the fibers are relatively aligned, and when the water content increases or decreases as the coating liquid is applied and dried in the process of forming the coat layer. , Dense and sparse fibers are likely to be formed, and such uneven fiber density tends to cause "waviness" that causes formation.
　また、比較的大きなスケールの「うねり」だけでなく、より微視的な繊維一本一本の太さや長さも地合を生じさせる要因となりうるが、Ｎ材は、繊維が太く長いため、地合を生じさせ易い。 In addition to the relatively large scale "waviness", the thickness and length of each microscopic fiber can also be a factor in causing formation, but N material is ground because the fibers are thick and long. It is easy to cause a match.
　一方、本実施形態の紙基材１３１に多く含まれるＬ材は、繊維同士の方向がバラバラで繊維密度の偏りが少ないため、「うねり」を発生させ難く、さらに、繊維一本一本も、細く短い。従って、紙基材１３１自体が、地合を生じ難い。 On the other hand, in the L material, which is abundantly contained in the paper base material 131 of the present embodiment, the directions of the fibers are different and the fiber density is less uneven, so that it is difficult to generate "waviness". Thin and short. Therefore, the paper base material 131 itself is unlikely to cause formation.
　以上のように、本実施形態では、平滑性に優れるキャストコート層１３３、およびＬ材を多く含む紙基材１３１自体の特性によって、剥離ライナー１００の地合が効果的に抑制されるため、剥離ライナー１００と基材層１１とが張り合わされても基材層１１に剥離ライナー１００の地合が転写され難く、粘着シート１０に地合の跡が残り難い。 As described above, in the present embodiment, the formation of the release liner 100 is effectively suppressed by the characteristics of the cast coat layer 133 having excellent smoothness and the paper base material 131 itself containing a large amount of L material, so that the release liner 100 is peeled off. Even if the liner 100 and the base material layer 11 are bonded to each other, the formation of the release liner 100 is unlikely to be transferred to the base material layer 11, and traces of the formation are unlikely to remain on the adhesive sheet 10.
　剥離ライナー１００は、紙基材１３１とキャストコート層１３３との間に、クレーコート層１３２（目止め層）を有しており、これによって、キャストコート層１３３が形成される際に塗布される塗工液が、紙基材１３１へと染み込んでいくのが抑制される。 The release liner 100 has a clay coat layer 132 (sealing layer) between the paper base material 131 and the cast coat layer 133, and is applied when the cast coat layer 133 is formed. It is suppressed that the coating liquid permeates into the paper base material 131.
　同塗工液が紙基材１３１に染み込んでいくと、塗膜ひいてはキャストコート層１３３の表面に、紙基材１３１の地合が浮き出る虞があるが、本実施形態ではクレーコート層１３２（目止め層）が、紙基材１３１の表面で繊維同士の隙間を塞ぎ、そのような塗工液の染み込みを抑制するため、キャストコート層１３３の平滑性をより高めることができる。 If the coating liquid soaks into the paper base material 131, the texture of the paper base material 131 may emerge on the surface of the coating film and the cast coat layer 133. However, in the present embodiment, the clay coat layer 132 (eyes) The stop layer) closes the gaps between the fibers on the surface of the paper base material 131 and suppresses the penetration of such a coating liquid, so that the smoothness of the cast coat layer 133 can be further improved.
　本実施形態では、キャストコート紙１３０に対し、ポリオレフィン層１１０とは反対側に、ポリオレフィン層１２０が積層されているため、剥離ライナー１００がカールし難い。 In the present embodiment, since the polyolefin layer 120 is laminated on the side opposite to the polyolefin layer 110 with respect to the cast coated paper 130, the release liner 100 is difficult to curl.
　本発明は、上述した実施形態に限定されるものではなく、特許請求の範囲内で種々改変できる。例えば、上記実施形態からポリオレフィン層１２０を省略した形態も、本発明の範囲に含まれる。 The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, a mode in which the polyolefin layer 120 is omitted from the above embodiment is also included in the scope of the present invention.
　また、上記実施形態では、図４に示されているように、基材層１１と剥離ライナー１００とは、剥離ライナー１００側に粘着剤層１２を形成して互いに張り合わされているが、本発明は、基材層１１側に粘着剤層１２を形成して、基材層１１と剥離ライナー１００とを張り合わせる形態も含む。 Further, in the above embodiment, as shown in FIG. 4, the base material layer 11 and the release liner 100 are bonded to each other by forming an adhesive layer 12 on the release liner 100 side. Also includes a form in which the pressure-sensitive adhesive layer 12 is formed on the base material layer 11 side, and the base material layer 11 and the release liner 100 are bonded to each other.
　また、上記実施形態のように、キャストコート紙は、キャストコート層と紙基材との間に目止め層を有することが好ましいが、本発明はこれに限定されない。キャストコート層と紙基材との間に目止め層がなく、キャストコート層が紙基材に直接積層されている形態も、本発明の範囲に含まれる。 Further, as in the above embodiment, the cast coated paper preferably has a sealing layer between the cast coat layer and the paper base material, but the present invention is not limited to this. The scope of the present invention also includes a form in which there is no sealing layer between the cast coat layer and the paper base material and the cast coat layer is directly laminated on the paper base material.
　また、粘着シートの形状は、特に限定されず、例えば、正方形や長方形等の矩形形状であってもよいし、長尺な形状であってもよいし、被着体の形状に対応した形状であってもよい。 The shape of the adhesive sheet is not particularly limited, and may be, for example, a rectangular shape such as a square or a rectangle, a long shape, or a shape corresponding to the shape of the adherend. There may be.
１０　　粘着シート、
１１　　基材層、
１２　　粘着剤層、
１３　　凹部、
１００　　剥離ライナー、
１１０　　ポリオレフィン層、
１１１　　凸部、
１２０　　ポリオレフィン層、
１３０　　キャストコート紙、
１３１　　紙基材、
１３２　　クレーコート層（目止め層）、
１３３　　キャストコート層。 10 Adhesive sheet,
11 base material layer,
12 Adhesive layer,
13 recess,
100 peeling liner,
110 Polyolefin layer,
111 convex part,
120 polyolefin layer,
130 cast coated paper,
131 Paper substrate,
132 Clay coat layer (sealing layer),
133 Cast coat layer.

Claims (5)

  1. 　連続する凸部が表面に設けられたポリオレフィン層と、
    　当該ポリオレフィン層が積層されたキャストコート紙と、を有し、
    　前記キャストコート紙において表層をなすキャストコート層が積層されている紙基材は、木材パルプによって形成されており、Ｎ材とＬ材との比率Ｎ材／Ｌ材が、質量比で０以上２／３以下である、剥離ライナー。     A polyolefin layer with continuous protrusions on its surface,
    It has a cast-coated paper on which the polyolefin layer is laminated, and
    In the cast-coated paper, the paper base material on which the cast coat layer forming the surface layer is laminated is formed of wood pulp, and the ratio of N material to L material is 0 or more in terms of mass ratio of N material / L material. A peeling liner that is 3/3 or less.
  2. 　前記キャストコート紙は、前記キャストコート層と前記紙基材との間に、目止め層を有する、請求項１に記載の剥離ライナー。 The release liner according to claim 1, wherein the cast-coated paper has a sealing layer between the cast-coated layer and the paper base material.
  3. 　前記キャストコート紙に対し、前記凸部の設けられた前記ポリオレフィン層とは反対側に、ポリオレフィン層をさらに有する、請求項１または請求項２に記載の剥離ライナー。 The release liner according to claim 1 or 2, wherein the cast-coated paper further has a polyolefin layer on the side opposite to the polyolefin layer provided with the convex portion.
  4. 　ＪＩＳ　Ｚ８７４１－１９９７に準拠した鏡面光沢度Ｇｓ（６０°）が、６０％以上である基材層と、
    　粘着剤層と、
    　請求項１～請求項３のうちのいずれか１つに記載の剥離ライナーと、を積層方向にこの順序で有する、粘着シート。     A base material layer having a mirror glossiness Gs (60 °) of 60% or more according to JIS Z8741-1997, and a base material layer.
    Adhesive layer and
    An adhesive sheet having the release liner according to any one of claims 1 to 3 in this order in the stacking direction.
  5. 　ＪＩＳ　Ｚ８７４１－１９９７に準拠した鏡面光沢度Ｇｓ（６０°）が、６０％以上である基材層、および、請求項１～請求項３のうちのいずれか１つに記載の剥離ライナーのうち、少なくとも一方に粘着剤層を形成し、
    　前記粘着剤層を介して、前記基材層と前記剥離ライナーとを張り合わせる、粘着シートの作製方法。     Of the base material layer having a mirror glossiness Gs (60 °) of 60% or more according to JIS Z8741-1997, and the release liner according to any one of claims 1 to 3. Form an adhesive layer on at least one side and
    A method for producing an adhesive sheet, in which the base material layer and the release liner are bonded to each other via the adhesive layer.
PCT/JP2019/040060 2019-10-10 2019-10-10 Release liner, adhesive sheet, and method for manufacturing adhesive sheet WO2021070335A1 (en)

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