WO2016111208A1 - Adhesive tape - Google Patents

Adhesive tape Download PDF

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Publication number
WO2016111208A1
WO2016111208A1 PCT/JP2015/086324 JP2015086324W WO2016111208A1 WO 2016111208 A1 WO2016111208 A1 WO 2016111208A1 JP 2015086324 W JP2015086324 W JP 2015086324W WO 2016111208 A1 WO2016111208 A1 WO 2016111208A1
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WO
WIPO (PCT)
Prior art keywords
pressure
sensitive adhesive
adhesive
adhesive tape
adhesive layer
Prior art date
Application number
PCT/JP2015/086324
Other languages
French (fr)
Japanese (ja)
Inventor
貴志 布施
武夫 小井沼
大地 草野
Original Assignee
株式会社寺岡製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社寺岡製作所 filed Critical 株式会社寺岡製作所
Priority to CN201580062410.1A priority Critical patent/CN107001868B/en
Priority to KR1020177016452A priority patent/KR102569970B1/en
Priority to JP2016568338A priority patent/JP6145231B2/en
Publication of WO2016111208A1 publication Critical patent/WO2016111208A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
    • H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
    • H05K7/20472—Sheet interfaces
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/204—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive coating being discontinuous

Definitions

  • the present invention relates to an adhesive tape used for adhering between a heat radiation sheet or a magnetic sheet and an adherend.
  • a heat radiating sheet graphite sheet
  • a magnetic sheet magnetic sheet
  • the double-sided adhesive tape may be used for the sticking (patent documents 1 grade).
  • a double-sided pressure-sensitive adhesive tape may be used to attach a heat dissipation sheet or a magnetic sheet to a member other than the casing, for example, a member in the vicinity of the back of the liquid crystal unit or the organic EL element.
  • an adhesive tape may be used for fixing a cushion material to be attached to the back of the liquid crystal unit or the organic EL element.
  • An object of the present invention is to provide a double-sided pressure-sensitive adhesive tape and a pressure-sensitive adhesive tape that can alleviate the occurrence of wrinkles on a heat-dissipating sheet or a magnetic sheet even if a dimensional change occurs due to heat shrinkage of an adherend.
  • the present invention is a pressure-sensitive adhesive tape having pressure-sensitive adhesive layers on both surfaces of a substrate, and at least one of the pressure-sensitive adhesive layers is a pressure-sensitive adhesive portion where a pressure-sensitive adhesive is present and a non-pressure-sensitive adhesive where no pressure-sensitive adhesive is present
  • the present invention is a laminate in which the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive tape of the present invention is bonded to the heat radiation sheet or the magnetic sheet, and the non-adhesive portion remains in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape after the bonding. Is the body.
  • the present invention even if a dimensional change occurs due to heat shrinkage of the adherend, the occurrence of wrinkles on the double-sided pressure-sensitive adhesive tape, the heat radiation sheet, and the magnetic sheet can be reduced.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of the pressure-sensitive adhesive tape of the present invention.
  • This pressure-sensitive adhesive tape has pressure-sensitive adhesive layers 1 and 2 on both surfaces of a base material 3, the pressure-sensitive adhesive layer 1 is a layer in which pressure-sensitive adhesive is present on the entire surface, and the pressure-sensitive adhesive layer 2 is a pressure-sensitive adhesive portion in which pressure-sensitive adhesive is present. 2a and a non-adhesive part 2b in which no adhesive is present.
  • this form is a preferable form, this invention is not limited to this.
  • the two pressure-sensitive adhesive layers may be layers in which the pressure-sensitive adhesive portion 2a and the non-pressure-sensitive adhesive portion 2b are mixed.
  • a square island-shaped adhesive portion 2 a may be a pattern in which the island-like adhesive portions 2 a are regularly arranged in a series at equal intervals. As shown in FIG. It may be a pattern regularly arranged in a row at a position shifted by half, or as shown in FIG. 4, it may be a pattern in which vertical stripe-like adhesive portions 2a are regularly arranged at equal intervals. As shown in FIG. 6, the square island-shaped adhesive portions 2a may be regularly arranged in a column at a half-shifted position, or the square island-shaped adhesive portions 2a are equally spaced as shown in FIG. 7 may be a pattern regularly arranged in an oblique row, or as shown in FIG. 7, a pattern regularly arranged in an oblique row where the square island-shaped adhesive portions 2a are shifted by half.
  • the pressure-sensitive adhesive portion 2a is preferably in the shape of islands or stripes as shown in FIGS.
  • the pressure-sensitive adhesive portion 2a is not limited to a regularly arranged pattern, and may be a random mixture.
  • Examples of the shape other than the square shape include a triangular shape and a polygonal shape, but the square shape can secure the area of the pressure-sensitive adhesive portion 2a most efficiently and is vertical and horizontal as compared with the stripe-shaped pressure-sensitive adhesive portion. It is also preferable from the viewpoint of isotropic property.
  • the streak shape is not limited to a linear arrangement, and may be, for example, a wavy line or a broken line.
  • the ratio of the area of the pressure-sensitive adhesive portion 2a in the pressure-sensitive adhesive layer 2 is 40 to 95%, preferably 50 to 95%. Due to the mixture of the adhesive part 2a and the non-adhesive part 2b at such a ratio, even if a dimensional change occurs due to heat shrinkage of the adherend, wrinkles of the double-sided adhesive tape, the heat dissipation sheet and the magnetic sheet are generated. Can be relaxed. The reason is not necessarily clear, but the non-adhesive parts 2b are dispersed and scattered, so that large wrinkles are not locally concentrated and may be partly dispersed. It is done. When the ratio of the area of the pressure-sensitive adhesive portion 2a exceeds 95%, the effect of mitigating wrinkle generation becomes difficult to be exhibited. Moreover, it exists in the tendency for adhesive force to fall that the ratio is less than 40%.
  • the adhesive tape of the present invention can also escape air bubbles from the non-adhesive portion 2b. Therefore, the present invention also has an effect that the air bubbles mixed at the time of bonding can be driven out and bonded uniformly.
  • the width of the adhesive part 2a is not particularly limited, but is preferably 5 mm or less, more preferably 1 mm or less. If the width of the pressure-sensitive adhesive portion 2a is moderately narrow, bubbles (partial swelling) are less likely to occur in the pressure-sensitive adhesive portion 2a, and there are fewer surface irregularities due to the pattern pattern, and the heat-dissipating sheet or magnetic Appearance when bonded to a sheet becomes smoother.
  • the gap between the adjacent pressure-sensitive adhesive portions 2a (that is, the width of the non-pressure-sensitive adhesive portion 2b) is not particularly limited, but is preferably 0.01 to 1 mm, more preferably 0.01 to 0.3 mm. If this gap is 0.01 mm or more, the generation of wrinkles can be more effectively mitigated. Moreover, if this gap is moderately narrow, the generation of local wrinkles only in the non-adhesive portion 2b can be further alleviated, and deterioration of appearance and reduction of adhesive strength can be further prevented. Furthermore, since the probability that the non-adhesive part 2b exists in the edge part of the processed product (cut product) of an adhesive tape becomes low, attachment property becomes more stable.
  • the thickness of the pressure-sensitive adhesive layers 1 and 2 is not particularly limited, but is preferably 0.5 to 7 ⁇ m.
  • the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape used for adhering between the heat-dissipating sheet or magnetic sheet and the adherend is preferably such a thin layer.
  • the present invention is particularly useful in a pressure-sensitive adhesive tape having such a thin pressure-sensitive adhesive layer.
  • the adhesive part 2a is thin, the non-adhesive part 2b is not easily crushed even when the tape is partially transported, punched out of various sheets, or when the tape is partially pressed at the time of bonding. It can stably utilize the properties of the adhesive.
  • the non-adhesive part 2b is also thin, the thermal conductivity of the heat dissipation sheet will not be deteriorated despite the presence of air.
  • the type of the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layers 1 and 2 is not particularly limited.
  • known pressure-sensitive adhesive compositions such as acrylic, polyester, silicone, and rubber can be used.
  • a curing agent crosslinking agent
  • curing agent is not specifically limited, For example, the compound which has a reactive functional group more than bifunctional can be used.
  • metal chelate curing agents aluminum chelate, titanium chelate, etc.
  • isocyanate curing agents epoxy curing agents, aziridine curing agents, and carbodiimide curing agents.
  • a curing agent having a high curing rate is preferable.
  • the pressure-sensitive adhesive composition may be mixed with a known tackifier, a heat conductive filler or a conductive filler. Further, a colorant such as carbon black may be mixed to color the tape as necessary.
  • the type of the base material 3 is not particularly limited.
  • known base materials such as polyethylene terephthalate, polyethylene naphthalate, polyetheretherketone, polyimide, aluminum or copper metal foil can be used.
  • the coloring base material which carbon black etc. printed or kneaded.
  • the thickness of the substrate 3 is preferably 1 to 75 ⁇ m, more preferably 1 to 12 ⁇ m.
  • the thickness of the adhesive tape (excluding the thickness of the release sheet) is preferably 4 to 85 ⁇ m, more preferably 4 to 30 ⁇ m.
  • the pressure-sensitive adhesive tape of the present invention is used for attaching a heat radiating sheet or a magnetic sheet and an adherend.
  • the adherend include casings of electronic devices such as mobile phones and smartphones, and members that generate heat and electromagnetic waves inside the electronic devices (for example, liquid crystal units, organic EL elements, CPUs, integrated circuits, batteries, etc.) And members in the vicinity thereof.
  • the adhesive tape of this invention can be used also for the use which laminates
  • the adhesive tape in this case is used for adhering one of the heat radiating sheet and the magnetic sheet and the adherend (the other one of the heat radiating sheet and the magnetic sheet).
  • the non-pressure-sensitive adhesive portion 2b is not easily crushed. Specifically, for example, it is preferable that the non-adhesive portion 2b is not crushed even when a 1 kg load is applied to a 30 ⁇ 30 mm size adhesive tape in a 70 ° C. atmosphere for 3 days.
  • the laminate of the present invention is formed by adhering the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive tape of the present invention and the heat dissipation sheet or the magnetic sheet, and the non-adhesive portion 2b remains in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape after the application. It is a laminated body. Such a laminate can be preferably obtained by using an adhesive tape in which the non-adhesive portion 2b does not collapse even when the above-described tests are performed.
  • part means “part by mass”.
  • Example 1 To 100 parts of the acrylic pressure-sensitive adhesive composition, 7 parts of a 2.5% diluted solution of an aluminum chelate-based curing agent (trade name: Aluminum Chelate A (W), manufactured by Kawaken Fine Chemical Co., Ltd.) is added, stirred, and pressure-sensitive adhesive Was prepared.
  • This pressure-sensitive adhesive was applied onto a 25 ⁇ m-thick polyester film that had been subjected to a release treatment so as to be entirely smooth, followed by drying by heating to form a pressure-sensitive adhesive layer 1 having a thickness of 1.0 ⁇ m.
  • the pressure-sensitive adhesive layer 1 was transferred onto one side of a 2 ⁇ m-thick base material (polyester film manufactured by Mitsubishi Plastics, trade name K100-2.0W).
  • the square-shaped island-shaped pressure-sensitive adhesive portions 2a are regularly arranged at regular intervals in tandem as shown in FIG. 2 by gravure printing on the release-treated polyester film having a thickness of 25 ⁇ m.
  • the adhesive layer 2 having a thickness of 2.0 ⁇ m was formed by heating and drying. And this adhesive layer 2 was transcribe
  • the length of one side of the square island-shaped adhesive part 2a of the adhesive layer 2 was 0.5 mm, the width of the non-adhesive part was 0.17 mm, and the area ratio of the adhesive part was 56%.
  • Example 2 To 100 parts of the acrylic adhesive composition, 1.2 parts of an isocyanate curing agent (trade name Coronate L45E, manufactured by Tosoh Corporation) was added and stirred to prepare an adhesive. This pressure-sensitive adhesive was applied onto a 25 ⁇ m-thick polyester film that had been subjected to a mold release treatment, and was then applied to heat and dried to form a pressure-sensitive adhesive layer 1 having a thickness of 1.5 ⁇ m. The pressure-sensitive adhesive layer 1 was transferred onto one side of a 2 ⁇ m-thick base material (polyester film manufactured by Mitsubishi Plastics, trade name K100-2.0W).
  • a 2 ⁇ m-thick base material polyyester film manufactured by Mitsubishi Plastics, trade name K100-2.0W
  • the square-shaped island-shaped pressure-sensitive adhesive portions 2a are regularly arranged at regular intervals in tandem as shown in FIG. 2 by gravure printing on the release-treated polyester film having a thickness of 25 ⁇ m.
  • the adhesive layer 2 having a thickness of 1.5 ⁇ m was formed by heating and drying. And this adhesive layer 2 was transcribe
  • the length of one side of the square island-shaped adhesive part 2a of the adhesive layer 2 was 1.3 mm, the width of the non-adhesive part was 0.2 mm, and the area ratio of the adhesive part was 75%.
  • the pressure-sensitive adhesive layer 2 was formed in the same manner as in Example 2 except that the round island-shaped pressure-sensitive adhesive portions 2a were formed so as to be regularly arranged in a row at a half-shifted position.
  • the diameter of the round island-shaped adhesive part 2a of the adhesive layer 2 was 1.1 mm
  • the width of the non-adhesive part was 0.15 mm
  • the area ratio of the adhesive part was 70%.
  • Example 4 To 100 parts of the acrylic pressure-sensitive adhesive composition, 0.6 part of an epoxy curing agent (trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Company) was added and stirred to prepare a pressure-sensitive adhesive. This pressure-sensitive adhesive was applied onto a 25 ⁇ m-thick polyester film that had been subjected to a mold release treatment so that the entire surface was smooth and dried by heating to form a pressure-sensitive adhesive layer 1 having a thickness of 3 ⁇ m. And this adhesive layer 1 was transcribe
  • an epoxy curing agent trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Company
  • the pressure-sensitive adhesive is applied on the surface of the substrate opposite to the pressure-sensitive adhesive layer 1 by gravure printing so that the vertical stripe-shaped pressure-sensitive adhesive portions 2a are regularly arranged at regular intervals as shown in FIG. Heat drying was performed to form a pressure-sensitive adhesive layer 2 having a thickness of 3 ⁇ m.
  • a 25 ⁇ m-thick polyester film having been subjected to a release treatment was bonded onto the pressure-sensitive adhesive layer 2 and cured at 40 ° C. for 3 days to obtain a double-sided pressure-sensitive adhesive tape having a total thickness of 10 ⁇ m.
  • the width of the vertical stripe-shaped adhesive part of the adhesive layer 2 was 0.8 mm, the width of the non-adhesive part was 0.5 mm, and the area ratio of the adhesive part was 62%.
  • Example 5 In the same manner as in Example 4, except that the width of the vertical stripe-shaped adhesive portion of the adhesive layer 2 was 4 mm, the width of the non-adhesive portion was 4 mm, and the area ratio of the adhesive portion was 50%. A double-sided adhesive tape having a thickness of 10 ⁇ m was obtained.
  • Example 1 A double-sided pressure-sensitive adhesive tape having a total thickness of 5 ⁇ m was prepared in the same manner as in Example 21 except that the pressure-sensitive adhesive layer 1 having a thickness of 1.5 ⁇ m was formed on both surfaces of the substrate.
  • the pressure-sensitive adhesive layer 1 of the double-sided tape was bonded to a graphite sheet having a thickness of 25 ⁇ m with a 2 kg roller. Further, a 5 ⁇ m thick polyester film single-sided adhesive tape (manufactured by Teraoka Seisakusho, trade name: 633M 0.005 black) was bonded to the other surface of the graphite sheet. Next, the pressure-sensitive adhesive layer 2 (Comparative Example 1 is the other pressure-sensitive adhesive layer 1) is bonded to a 1.5 mm thick acrylonitrile-butadiene-styrene resin plate (ABS plate) with a 2 kg roller so that the size is 90 ⁇ 40 mm. A test piece was prepared.
  • This test piece is heated in an atmosphere of 85 ° C. for 1 hour, and left in an atmosphere of a temperature of 23 ⁇ 1 ° C. and a humidity of 50 ⁇ 5% for 1 hour.
  • Graphite generated due to the difference in thermal shrinkage between the graphite sheet and the ABS plate The presence or absence of wrinkles due to sheet deflection was observed and evaluated according to the following criteria. “ ⁇ ”: No wrinkle occurrence “ ⁇ ”: Wrinkle occurrence
  • Adhesive force According to JIS-Z-1528, 180 ° adhesive strength (N / 20 mm width) was measured by the following procedure.
  • Adhesive layer 2 of 100 x 100 mm double-sided tape (Comparative example 1 is adhesive layer 1) is bonded to the glass plate so as to embrace the air bubbles, and whether the air bubbles entrained can be driven out using a 2 kg roller. Were observed and evaluated according to the following criteria. “ ⁇ ”: Can expel bubbles “ ⁇ ”: Cannot expel bubbles
  • the pressure-sensitive adhesive layer 1 of the double-sided tape was bonded to one side of a graphite sheet having a size of 200 ⁇ 200 mm and a thickness of 18 ⁇ m. Furthermore, a 5 ⁇ m thick polyester film single-sided adhesive tape (manufactured by Teraoka Seisakusho, trade name: 633M 0.005 black) was bonded to the other surface of the graphite sheet. Next, the adhesive layer 2 of the double-sided tape (Comparative Example 1 is the other adhesive layer 1) was bonded to an aluminum plate having a size of 200 ⁇ 200 mm and a thickness of 1.5 mm to obtain a sample piece. In an atmosphere of temperature 23 ⁇ 1 ° C.
  • a heat source (KIKUSUI, apparatus name PASIO-35) of 110 ° C. was brought into contact with the test piece from the aluminum plate surface, and 20 minutes at a position 60 mm from the heat source.
  • the surface temperature of the later sample piece was measured with a thermal image measuring device (manufactured by Apiste, device name FSV-210L) from the graphite sheet laminate product side, and the thermal conductivity was evaluated.
  • Examples 1 to 5 had good properties in all of flexibility, ease of bubble removal, and thermal conductivity.
  • Comparative Example 1 in which the entire surface was coated and the paste surface was smooth was inferior in deflection resistance and ease of bubble removal after bonding.
  • the evaluations of the flex resistance of the pressure-sensitive adhesive tapes of Examples 1 to 5 are all “ ⁇ ” (no occurrence of wrinkles).
  • the width of the pressure-sensitive adhesive portion 2a is compared. Was particularly narrow, so that the surface roughness due to the pattern pattern was less, and the appearance was smoother than in Examples 2 to 5.
  • the non-adhesive portion 2b is not crushed even when a load of 1 kg is applied to an adhesive tape of 30 ⁇ 30 mm size in a 70 ° C. atmosphere for 3 days. The non-adhesive part remained in the adhesive layer after pasting.

Abstract

The present invention discloses an adhesive tape having an adhesive layer 1, 2 respectively on the two sides of a substrate, wherein: at least the adhesive layer 2 on one side among the adhesive layers is formed by comprising, in a mixed manner, adhesive portions 2a in which an adhesive is present and non-adhesive portions 2b in which the adhesive is not present; and the proportion of the surface area of the adhesive portions 2a in the adhesive layer is 40 to 95%. The adhesive tape is used for adherence between a heat radiating sheet or magnetic sheet and an adherend, and can reduce the occurrence of wrinkles in a two-sided adhesive tape and the heat radiating sheet or magnetic sheet.

Description

粘着テープAdhesive tape
　本発明は、放熱シート又は磁性シートと被着体の間の貼り付けに使用される粘着テープに関する。 The present invention relates to an adhesive tape used for adhering between a heat radiation sheet or a magnetic sheet and an adherend.
　例えば携帯電話、スマートフォン等の電子機器においては、その樹脂製筐体に放熱シート（グラファイトシート）や磁性シート（フェライトシート）が貼着される場合がある。また、電子機器が大型になると、それに合わせて放熱シートや磁性シートも大型化される。そしてその貼着には両面粘着テープが使用される場合がある（特許文献１等）。さらに筐体以外の部材、例えば液晶ユニットや有機ＥＬ素子の裏等の近辺にある部材に放熱シートや磁性シートを貼着する為に両面粘着テープが使用される場合もある。また、例えば液晶ユニット裏や有機ＥＬ素子の裏に貼り付けるクッション材の固定の為に粘着テープが使用される場合もある。 For example, in an electronic device such as a mobile phone or a smartphone, a heat radiating sheet (graphite sheet) or a magnetic sheet (ferrite sheet) may be attached to the resin casing. Moreover, when an electronic device becomes large, the heat dissipation sheet and the magnetic sheet are also enlarged accordingly. And the double-sided adhesive tape may be used for the sticking (patent documents 1 grade). Furthermore, a double-sided pressure-sensitive adhesive tape may be used to attach a heat dissipation sheet or a magnetic sheet to a member other than the casing, for example, a member in the vicinity of the back of the liquid crystal unit or the organic EL element. Further, for example, an adhesive tape may be used for fixing a cushion material to be attached to the back of the liquid crystal unit or the organic EL element.
　しかし、筐体等の被着体の熱収縮により寸法変化が発生すると両面粘着テープ及び放熱シートや磁性シートにしわが発生し、外観が悪化する場合がある。また、このようなしわの発生に伴い、放熱シートや磁性シートの機能が低下する恐れもある。 However, when a dimensional change occurs due to heat shrinkage of the adherend such as a housing, wrinkles are generated in the double-sided pressure-sensitive adhesive tape, the heat radiating sheet, and the magnetic sheet, and the appearance may be deteriorated. Moreover, with the occurrence of such wrinkles, the functions of the heat dissipation sheet and the magnetic sheet may be deteriorated.
特開２０１０-２５４９７９号公報JP 2010-254979 A
　本発明の目的は、被着体の熱収縮により寸法変化が発生しても、両面粘着テープ及び放熱シートや磁性シートのしわの発生を緩和できる粘着テープを提供することにある。 An object of the present invention is to provide a double-sided pressure-sensitive adhesive tape and a pressure-sensitive adhesive tape that can alleviate the occurrence of wrinkles on a heat-dissipating sheet or a magnetic sheet even if a dimensional change occurs due to heat shrinkage of an adherend.
　本発明は、基材の両面に粘着剤層を有する粘着テープであって、前記粘着剤層のうち少なくとも片面の粘着剤層は粘着剤が存在する粘着剤部分と粘着剤が存在しない非粘着剤部分とが混在してなり、前記粘着剤層における粘着剤部分の面積の割合が４０～９５％である、放熱シート又は磁性シートと被着体の間の貼り付けに使用される粘着テープである。 The present invention is a pressure-sensitive adhesive tape having pressure-sensitive adhesive layers on both surfaces of a substrate, and at least one of the pressure-sensitive adhesive layers is a pressure-sensitive adhesive portion where a pressure-sensitive adhesive is present and a non-pressure-sensitive adhesive where no pressure-sensitive adhesive is present A pressure-sensitive adhesive tape used for adhering between a heat-dissipating sheet or a magnetic sheet and an adherend, wherein the ratio of the area of the pressure-sensitive adhesive portion in the pressure-sensitive adhesive layer is 40 to 95%. .
　さらに本発明は、本発明の粘着テープの粘着剤層側と、放熱シート又は磁性シートとを貼り付けてなり、貼り付け後の粘着テープの粘着剤層に非粘着剤部分が残存している積層体である。 Furthermore, the present invention is a laminate in which the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive tape of the present invention is bonded to the heat radiation sheet or the magnetic sheet, and the non-adhesive portion remains in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape after the bonding. Is the body.
　本発明によれば、被着体の熱収縮により寸法変化が発生しても、両面粘着テープ及び放熱シートや磁性シートのしわの発生を緩和することができる。 According to the present invention, even if a dimensional change occurs due to heat shrinkage of the adherend, the occurrence of wrinkles on the double-sided pressure-sensitive adhesive tape, the heat radiation sheet, and the magnetic sheet can be reduced.
本発明の粘着テープの一実施形態を示す模式的断面図である。It is typical sectional drawing which shows one Embodiment of the adhesive tape of this invention. 本発明の粘着テープの一実施形態を示す模式的平面図である。It is a typical top view showing one embodiment of the adhesive tape of the present invention. 本発明の粘着テープの一実施形態を示す模式的平面図である。It is a typical top view showing one embodiment of the adhesive tape of the present invention. 本発明の粘着テープの一実施形態を示す模式的平面図である。It is a typical top view showing one embodiment of the adhesive tape of the present invention. 本発明の粘着テープの一実施形態を示す模式的平面図である。It is a typical top view showing one embodiment of the adhesive tape of the present invention. 本発明の粘着テープの一実施形態を示す模式的平面図である。It is a typical top view showing one embodiment of the adhesive tape of the present invention. 本発明の粘着テープの一実施形態を示す模式的平面図である。It is a typical top view showing one embodiment of the adhesive tape of the present invention.
　図１は、本発明の粘着テープの一実施形態を示す模式的断面図である。この粘着テープは、基材３の両面に粘着剤層１及び２を有し、粘着剤層１は全面に粘着剤が存在する層であり、粘着剤層２は粘着剤が存在する粘着剤部分２ａと粘着剤が存在しない非粘着剤部分２ｂとが混在してなる層である。この形態は好ましい形態であるが、本発明はこれに限定されない。例えば二つの粘着剤層がどちらも粘着剤部分２ａと非粘着剤部分２ｂとが混在してなる層であっても良い。 FIG. 1 is a schematic cross-sectional view showing an embodiment of the pressure-sensitive adhesive tape of the present invention. This pressure-sensitive adhesive tape has pressure-sensitive adhesive layers 1 and 2 on both surfaces of a base material 3, the pressure-sensitive adhesive layer 1 is a layer in which pressure-sensitive adhesive is present on the entire surface, and the pressure-sensitive adhesive layer 2 is a pressure-sensitive adhesive portion in which pressure-sensitive adhesive is present. 2a and a non-adhesive part 2b in which no adhesive is present. Although this form is a preferable form, this invention is not limited to this. For example, the two pressure-sensitive adhesive layers may be layers in which the pressure-sensitive adhesive portion 2a and the non-pressure-sensitive adhesive portion 2b are mixed.
　粘着剤部分２ａと非粘着剤部分２ｂが混在するパターンは特に制限されない。例えば、図２に示すように、四角い島状の粘着剤部分２ａが等間隔に縦列で規則正しく配列したパターンであっても良いし、図３に示すように、丸い島状の粘着剤部分２ａが半分ずれた位置の横列で規則正しく配列したパターンであっても良いし、図４に示すように、縦筋状の粘着剤部分２ａが等間隔に規則正しく配列したパターンであっても良いし、図５に示すように、四角い島状の粘着剤部分２ａが半分ずれた位置の縦列で規則正しく配列したパターンであっても良いし、図６に示すように、四角い島状の粘着剤部分２ａが等間隔に斜め列で規則正しく配列したパターンであっても良いし、図７に示すように、四角い島状の粘着剤部分２ａが半分ずれた位置の斜め列で規則正しく配列したパターンであっても良い。 The pattern in which the adhesive part 2a and the non-adhesive part 2b are mixed is not particularly limited. For example, as shown in FIG. 2, a square island-shaped adhesive portion 2 a may be a pattern in which the island-like adhesive portions 2 a are regularly arranged in a series at equal intervals. As shown in FIG. It may be a pattern regularly arranged in a row at a position shifted by half, or as shown in FIG. 4, it may be a pattern in which vertical stripe-like adhesive portions 2a are regularly arranged at equal intervals. As shown in FIG. 6, the square island-shaped adhesive portions 2a may be regularly arranged in a column at a half-shifted position, or the square island-shaped adhesive portions 2a are equally spaced as shown in FIG. 7 may be a pattern regularly arranged in an oblique row, or as shown in FIG. 7, a pattern regularly arranged in an oblique row where the square island-shaped adhesive portions 2a are shifted by half.
　粘着剤部分２ａは、図２～図７に示すような島状又は筋状が好ましい。ただし、粘着剤部分２ａは規則正しく配列したパターンに限定されず、ランダムに混在させたものでも構わない。四角状以外の形状としては、例えば三角状、多角形状が挙げられるが、四角状が粘着剤部分２ａの面積を一番効率的に確保でき、かつ筋状の粘着剤部分と比較して縦横の等方性の点からも好ましい。筋状の形状は直線的に配列されるものに限定されず、例えば波線状でも折れ線状でも良い。 The pressure-sensitive adhesive portion 2a is preferably in the shape of islands or stripes as shown in FIGS. However, the pressure-sensitive adhesive portion 2a is not limited to a regularly arranged pattern, and may be a random mixture. Examples of the shape other than the square shape include a triangular shape and a polygonal shape, but the square shape can secure the area of the pressure-sensitive adhesive portion 2a most efficiently and is vertical and horizontal as compared with the stripe-shaped pressure-sensitive adhesive portion. It is also preferable from the viewpoint of isotropic property. The streak shape is not limited to a linear arrangement, and may be, for example, a wavy line or a broken line.
　粘着剤層２における粘着剤部分２ａの面積の割合は４０～９５％であり、好ましくは５０～９５％である。このような割合で粘着剤部分２ａと非粘着剤部分２ｂとが混在することにより、被着体の熱収縮により寸法変化が発生しても、両面粘着テープ及び放熱シートや磁性シートのしわの発生を緩和できる。その理由は必ずしも明らかではないが、非粘着剤部分２ｂが分散・点在することで、大きなしわが局所的に集中発生することが無くなり、全体的に分散されることも一因であろうと考えられる。粘着剤部分２ａの面積の割合が９５％を超えると、しわ発生の緩和効果が発現し難くなる。また、その割合が４０％未満であると粘着力が低下してしまう傾向にある。 The ratio of the area of the pressure-sensitive adhesive portion 2a in the pressure-sensitive adhesive layer 2 is 40 to 95%, preferably 50 to 95%. Due to the mixture of the adhesive part 2a and the non-adhesive part 2b at such a ratio, even if a dimensional change occurs due to heat shrinkage of the adherend, wrinkles of the double-sided adhesive tape, the heat dissipation sheet and the magnetic sheet are generated. Can be relaxed. The reason is not necessarily clear, but the non-adhesive parts 2b are dispersed and scattered, so that large wrinkles are not locally concentrated and may be partly dispersed. It is done. When the ratio of the area of the pressure-sensitive adhesive portion 2a exceeds 95%, the effect of mitigating wrinkle generation becomes difficult to be exhibited. Moreover, it exists in the tendency for adhesive force to fall that the ratio is less than 40%.
　なお、粘着テープの貼り付けの際に混入する気泡が原因で部分的なふくらみが発生することがあるが、本発明の粘着テープは、非粘着剤部分２ｂから気泡を逃すこともできる。したがって本発明は、貼り合わせ時に混入する気泡を追い出し、均一に貼り合わせる事ができるという効果も奏する。 In addition, although partial swelling may occur due to air bubbles mixed when the adhesive tape is applied, the adhesive tape of the present invention can also escape air bubbles from the non-adhesive portion 2b. Therefore, the present invention also has an effect that the air bubbles mixed at the time of bonding can be driven out and bonded uniformly.
　粘着剤部分２ａの幅は特に限定されないが、好ましくは５ｍｍ以下、より好ましくは１ｍｍ以下である。粘着剤部分２ａの幅が適度に狭ければ、粘着剤部分２ａ中に気泡の混入（部分的なふくらみ）がより生じ難くなり、パターン模様に起因する表面の凹凸がより少なく、放熱シート又は磁性シートと貼り合わせた際の外観がより平滑になる。 The width of the adhesive part 2a is not particularly limited, but is preferably 5 mm or less, more preferably 1 mm or less. If the width of the pressure-sensitive adhesive portion 2a is moderately narrow, bubbles (partial swelling) are less likely to occur in the pressure-sensitive adhesive portion 2a, and there are fewer surface irregularities due to the pattern pattern, and the heat-dissipating sheet or magnetic Appearance when bonded to a sheet becomes smoother.
　隣り合う粘着剤部分２ａの隙間（すなわち非粘着剤部分２ｂの幅）は特に限定されないが、好ましくは０.０１～１ｍｍ、より好ましくは０.０１～０.３ｍｍである。この隙間が０.０１ｍｍ以上であれば、しわの発生をより効果的に緩和できる。またこの隙間が適度に狭ければ、非粘着剤部分２ｂのみにおける局所的なしわの発生をより緩和でき、外観の悪化や粘着力の低下をより防止できる。さらには、粘着テープの加工品（カット品）のエッジ部に非粘着剤部分２ｂが存在する確率が低くなるので、取り付け性がより安定する。 The gap between the adjacent pressure-sensitive adhesive portions 2a (that is, the width of the non-pressure-sensitive adhesive portion 2b) is not particularly limited, but is preferably 0.01 to 1 mm, more preferably 0.01 to 0.3 mm. If this gap is 0.01 mm or more, the generation of wrinkles can be more effectively mitigated. Moreover, if this gap is moderately narrow, the generation of local wrinkles only in the non-adhesive portion 2b can be further alleviated, and deterioration of appearance and reduction of adhesive strength can be further prevented. Furthermore, since the probability that the non-adhesive part 2b exists in the edge part of the processed product (cut product) of an adhesive tape becomes low, attachment property becomes more stable.
　粘着剤層１及び２の厚さは特に限定されないが、好ましくは０.５～７μｍである。特に、放熱シート又は磁性シートと被着体の間の貼り付けに使用される粘着テープの粘着剤層は、このような薄い層であることが好ましい。また一般に粘着剤部分２ａが薄い場合はしわが発生し易い傾向にあるので、本発明はこのような薄い粘着剤層を有する粘着テープにおいて特に有用である。また粘着剤部分２ａが薄い場合は、テープの運搬時や各種シートの抜き加工時、貼り合わせ時に部分的にテープに圧力をかけても非粘着剤部分２ｂはつぶれにくいため、取り扱い性に優れ、安定して粘着剤の特性を活かす事ができる。さらに、非粘着剤部分２ｂも薄ければそこに空気が存在するにもかかわらず、放熱シートの熱伝導性を悪化させない。 The thickness of the pressure-sensitive adhesive layers 1 and 2 is not particularly limited, but is preferably 0.5 to 7 μm. In particular, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape used for adhering between the heat-dissipating sheet or magnetic sheet and the adherend is preferably such a thin layer. In general, when the pressure-sensitive adhesive portion 2a is thin, wrinkles tend to be easily generated. Therefore, the present invention is particularly useful in a pressure-sensitive adhesive tape having such a thin pressure-sensitive adhesive layer. In addition, when the adhesive part 2a is thin, the non-adhesive part 2b is not easily crushed even when the tape is partially transported, punched out of various sheets, or when the tape is partially pressed at the time of bonding. It can stably utilize the properties of the adhesive. Furthermore, if the non-adhesive part 2b is also thin, the thermal conductivity of the heat dissipation sheet will not be deteriorated despite the presence of air.
　粘着剤層１及び２を構成する粘着剤組成物の種類は特に限定されない。例えば、アクリル系、ポリエステル系、シリコーン系、ゴム系等の公知の粘着剤組成物を使用できる。粘着剤組成物には、粘着剤の凝集力を高める為に硬化剤（架橋剤）を配合することが好ましい。凝集力が高ければ、粘着シートの非粘着剤部分２ｂがつぶれ難くなる。硬化剤の種類は特に限定されず、例えば２官能以上の反応性官能基を有する化合物を使用できる。具体例としては、金属キレート系硬化剤（アルミキレート、チタンキレート等）、イソシアネート系硬化剤、エポキシ系硬化剤、アジリジン系硬化剤、カルボジイミド系硬化剤が挙げられる。特に硬化速度が速い硬化剤を使用すれば、粘着テープの製造工程において、例えば粘着剤層形成直後に粘着テープを巻き取る際に圧力がかかっても非粘着剤部分２ｂがつぶれ難い。このような点からは、硬化速度が速い金属キレート系硬化剤が好ましい。 The type of the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layers 1 and 2 is not particularly limited. For example, known pressure-sensitive adhesive compositions such as acrylic, polyester, silicone, and rubber can be used. In order to increase the cohesive strength of the pressure-sensitive adhesive, it is preferable to add a curing agent (crosslinking agent) to the pressure-sensitive adhesive composition. If the cohesive force is high, the non-adhesive part 2b of the pressure-sensitive adhesive sheet is hardly crushed. The kind of hardening | curing agent is not specifically limited, For example, the compound which has a reactive functional group more than bifunctional can be used. Specific examples include metal chelate curing agents (aluminum chelate, titanium chelate, etc.), isocyanate curing agents, epoxy curing agents, aziridine curing agents, and carbodiimide curing agents. In particular, when a curing agent having a high curing rate is used, even in the pressure-sensitive adhesive tape manufacturing process, for example, immediately after the pressure-sensitive adhesive layer is formed, even when pressure is applied, the non-pressure-sensitive adhesive portion 2b is not easily crushed. From such a point, a metal chelate curing agent having a high curing rate is preferable.
　粘着剤組成物には、公知の粘着付与剤、熱伝導性フィラーや導電フィラーを混入しても良い。さらに必要に応じてテープを着色する為に、カーボンブラック等の着色剤を混入しても良い。 The pressure-sensitive adhesive composition may be mixed with a known tackifier, a heat conductive filler or a conductive filler. Further, a colorant such as carbon black may be mixed to color the tape as necessary.
　基材３の種類は特に限定されない。例えば、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリエーテルエーテルケトン、ポリイミド、アルミや銅の金属箔等、公知の基材を使用できる。また必要に応じてテープを着色する為に、カーボンブラック等を印刷又は練り込んだ着色基材を用いても良い。基材３の厚さは、好ましくは１～７５μｍ、より好ましくは１～１２μｍである。また粘着テープの厚さ（剥離シートの厚さは除く）は、好ましくは４～８５μｍ、より好ましくは４～３０μｍである。 The type of the base material 3 is not particularly limited. For example, known base materials such as polyethylene terephthalate, polyethylene naphthalate, polyetheretherketone, polyimide, aluminum or copper metal foil can be used. Moreover, in order to color a tape as needed, you may use the coloring base material which carbon black etc. printed or kneaded. The thickness of the substrate 3 is preferably 1 to 75 μm, more preferably 1 to 12 μm. The thickness of the adhesive tape (excluding the thickness of the release sheet) is preferably 4 to 85 μm, more preferably 4 to 30 μm.
　本発明の粘着テープは、放熱シート又は磁性シートと被着体との貼り付けに使用される。被着体の具体例としては、携帯電話、スマートフォン等の電子機器の筐体、並びに電子機器内部で熱や電磁波を発生する部材（例えば液晶ユニット、有機ＥＬ素子、ＣＰＵ、集積回路、電池など）やその近辺の部材が挙げられる。さらに本発明の粘着テープは、放熱シートと磁性シートを積層する用途にも使用できる。この場合の粘着テープは、放熱シート及び磁性シートの一方と、被着体（放熱シート及び磁性シートの他の一方）との貼り付けに使用されるものである。 The pressure-sensitive adhesive tape of the present invention is used for attaching a heat radiating sheet or a magnetic sheet and an adherend. Specific examples of the adherend include casings of electronic devices such as mobile phones and smartphones, and members that generate heat and electromagnetic waves inside the electronic devices (for example, liquid crystal units, organic EL elements, CPUs, integrated circuits, batteries, etc.) And members in the vicinity thereof. Furthermore, the adhesive tape of this invention can be used also for the use which laminates | stacks a thermal radiation sheet | seat and a magnetic sheet. The adhesive tape in this case is used for adhering one of the heat radiating sheet and the magnetic sheet and the adherend (the other one of the heat radiating sheet and the magnetic sheet).
　本発明の粘着テープは、非粘着剤部分２ｂがつぶれ難いものであることが好ましい。具体的には、例えば、３０×３０ｍｍのサイズの粘着テープに７０℃雰囲気下で１ｋｇの荷重を３日間かけた場合であっても、非粘着剤部分２ｂがつぶれないことが好ましい。 In the pressure-sensitive adhesive tape of the present invention, it is preferable that the non-pressure-sensitive adhesive portion 2b is not easily crushed. Specifically, for example, it is preferable that the non-adhesive portion 2b is not crushed even when a 1 kg load is applied to a 30 × 30 mm size adhesive tape in a 70 ° C. atmosphere for 3 days.
　本発明の積層体は、本発明の粘着テープの粘着剤層側と、放熱シート又は磁性シートとを貼り付けてなり、貼り付け後の粘着テープの粘着剤層に非粘着剤部分２ｂが残存している積層体である。このような積層体は、好ましくは上述した試験を行っても非粘着剤部分２ｂがつぶれない粘着テープを使用することにより得ることができる。 The laminate of the present invention is formed by adhering the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive tape of the present invention and the heat dissipation sheet or the magnetic sheet, and the non-adhesive portion 2b remains in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape after the application. It is a laminated body. Such a laminate can be preferably obtained by using an adhesive tape in which the non-adhesive portion 2b does not collapse even when the above-described tests are performed.
　以下、実施例により本発明を更に詳細に説明する。以下の記載において「部」は「質量部」を意味する。 Hereinafter, the present invention will be described in more detail with reference to examples. In the following description, “part” means “part by mass”.
　＜実施例１＞
　アクリル系粘着剤組成物１００部に対し、アルミキレート系硬化剤の２.５％希釈溶液（川研ファインケミカル社製、商品名アルミキレートＡ（Ｗ））７部を添加し、攪拌して粘着剤を調製した。この粘着剤を、離型処理した厚さ２５μｍのポリエステルフィルムの上に全面平滑に塗布し、加熱乾燥を行い厚さ１.０μｍの粘着剤層１を形成した。そしてこの粘着剤層１を、厚さ２μｍの基材（三菱樹脂社製ポリエステルフィルム、商品名Ｋ１００－２.０Ｗ）の片面に転写した。 <Example 1>
To 100 parts of the acrylic pressure-sensitive adhesive composition, 7 parts of a 2.5% diluted solution of an aluminum chelate-based curing agent (trade name: Aluminum Chelate A (W), manufactured by Kawaken Fine Chemical Co., Ltd.) is added, stirred, and pressure-sensitive adhesive Was prepared. This pressure-sensitive adhesive was applied onto a 25 μm-thick polyester film that had been subjected to a release treatment so as to be entirely smooth, followed by drying by heating to form a pressure-sensitive adhesive layer 1 having a thickness of 1.0 μm. The pressure-sensitive adhesive layer 1 was transferred onto one side of a 2 μm-thick base material (polyester film manufactured by Mitsubishi Plastics, trade name K100-2.0W).
　またこれとは別に、前記粘着剤を、離型処理した厚さ２５μｍのポリエステルフィルムの上にグラビア印刷により図２に示すように四角い島状の粘着剤部分２ａが等間隔に縦列で規則正しく配列するように塗布し、加熱乾燥を行い厚さ２.０μｍの粘着剤層２を形成した。そしてこの粘着剤層２を、前記基材の粘着剤層１とは反対側の面に転写した。 Separately from this, the square-shaped island-shaped pressure-sensitive adhesive portions 2a are regularly arranged at regular intervals in tandem as shown in FIG. 2 by gravure printing on the release-treated polyester film having a thickness of 25 μm. The adhesive layer 2 having a thickness of 2.0 μm was formed by heating and drying. And this adhesive layer 2 was transcribe | transferred to the surface on the opposite side to the adhesive layer 1 of the said base material.
　次いで、４０℃で３日間養生して総厚５μｍの両面粘着テープを得た。粘着剤層２の四角い島状の粘着剤部分２ａの一辺の長さは０.５ｍｍ、非粘着剤部分の幅は０.１７ｍｍ、粘着剤部分の面積の割合は５６％とした。 Then, it was cured at 40 ° C. for 3 days to obtain a double-sided adhesive tape having a total thickness of 5 μm. The length of one side of the square island-shaped adhesive part 2a of the adhesive layer 2 was 0.5 mm, the width of the non-adhesive part was 0.17 mm, and the area ratio of the adhesive part was 56%.
　＜実施例２＞
　アクリル系粘着剤組成物１００部に対し、イソシアネート系硬化剤（東ソー社製、商品名コロネートＬ４５Ｅ）１.２部を添加し、攪拌して粘着剤を調製した。この粘着剤を、離型処理した厚さ２５μｍのポリエステルフィルムの上に全面平滑に塗布し、加熱乾燥を行い厚さ１.５μｍの粘着剤層１を形成した。そしてこの粘着剤層１を、厚さ２μｍの基材（三菱樹脂社製ポリエステルフィルム、商品名Ｋ１００－２.０Ｗ）の片面に転写した。 <Example 2>
To 100 parts of the acrylic adhesive composition, 1.2 parts of an isocyanate curing agent (trade name Coronate L45E, manufactured by Tosoh Corporation) was added and stirred to prepare an adhesive. This pressure-sensitive adhesive was applied onto a 25 μm-thick polyester film that had been subjected to a mold release treatment, and was then applied to heat and dried to form a pressure-sensitive adhesive layer 1 having a thickness of 1.5 μm. The pressure-sensitive adhesive layer 1 was transferred onto one side of a 2 μm-thick base material (polyester film manufactured by Mitsubishi Plastics, trade name K100-2.0W).
　またこれとは別に、前記粘着剤を、離型処理した厚さ２５μｍのポリエステルフィルムの上にグラビア印刷により図２に示すように四角い島状の粘着剤部分２ａが等間隔に縦列で規則正しく配列するように塗布し、加熱乾燥を行い厚さ１.５μｍの粘着剤層２を形成した。そしてこの粘着剤層２を、前記基材の粘着剤層１とは反対側の面に転写した。 Separately from this, the square-shaped island-shaped pressure-sensitive adhesive portions 2a are regularly arranged at regular intervals in tandem as shown in FIG. 2 by gravure printing on the release-treated polyester film having a thickness of 25 μm. The adhesive layer 2 having a thickness of 1.5 μm was formed by heating and drying. And this adhesive layer 2 was transcribe | transferred to the surface on the opposite side to the adhesive layer 1 of the said base material.
　次いで、４０℃で３日間養生して総厚５μｍの両面粘着テープを得た。粘着剤層２の四角い島状の粘着剤部分２ａの一辺の長さは１.３ｍｍ、非粘着剤部分の幅は０.２ｍｍ、粘着剤部分の面積の割合は７５％とした。 Then, it was cured at 40 ° C. for 3 days to obtain a double-sided adhesive tape having a total thickness of 5 μm. The length of one side of the square island-shaped adhesive part 2a of the adhesive layer 2 was 1.3 mm, the width of the non-adhesive part was 0.2 mm, and the area ratio of the adhesive part was 75%.
　＜実施例３＞
　図３に示すように丸い島状の粘着剤部分２ａが半分ずれた位置の横列で規則正しく配列するように形成したこと以外は、実施例２と同様にして粘着剤層２を形成し、両面テープを作製した。粘着剤層２の丸い島状の粘着剤部分２ａの直径は１.１ｍｍ、非粘着剤部分の幅は０.１５ｍｍ、粘着剤部分の面積の割合は７０％とした。 <Example 3>
As shown in FIG. 3, the pressure-sensitive adhesive layer 2 was formed in the same manner as in Example 2 except that the round island-shaped pressure-sensitive adhesive portions 2a were formed so as to be regularly arranged in a row at a half-shifted position. Was made. The diameter of the round island-shaped adhesive part 2a of the adhesive layer 2 was 1.1 mm, the width of the non-adhesive part was 0.15 mm, and the area ratio of the adhesive part was 70%.
　＜実施例４＞
　アクリル系粘着剤組成物１００部に対し、エポキシ系硬化剤（三菱ガス化学社製、商品名ＴＥＴＲＡＤ－Ｃ）０．６部を添加し、攪拌して粘着剤を調製した。この粘着剤を、離型処理した厚さ２５μｍのポリエステルフィルムの上に全面平滑に塗布し、加熱乾燥を行い厚さ３μｍの粘着剤層１を形成した。そしてこの粘着剤層１を、厚さ４μｍの基材（東レ社製ポリエステルフィルム、商品名ルミラー４ＡＦ５３）の片面に転写した。 <Example 4>
To 100 parts of the acrylic pressure-sensitive adhesive composition, 0.6 part of an epoxy curing agent (trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Company) was added and stirred to prepare a pressure-sensitive adhesive. This pressure-sensitive adhesive was applied onto a 25 μm-thick polyester film that had been subjected to a mold release treatment so that the entire surface was smooth and dried by heating to form a pressure-sensitive adhesive layer 1 having a thickness of 3 μm. And this adhesive layer 1 was transcribe | transferred to the single side | surface of the base material (Toray Co., Ltd. polyester film, brand name Lumirror 4AF53) of thickness 4 micrometers.
　次いで前記粘着剤を、前記基材の粘着剤層１とは反対側の面にグラビア印刷により図４に示すように縦筋状の粘着剤部分２ａが等間隔に規則正しく配列するように塗布し、加熱乾燥を行い、厚さ３μｍの粘着剤層２を形成した。 Next, the pressure-sensitive adhesive is applied on the surface of the substrate opposite to the pressure-sensitive adhesive layer 1 by gravure printing so that the vertical stripe-shaped pressure-sensitive adhesive portions 2a are regularly arranged at regular intervals as shown in FIG. Heat drying was performed to form a pressure-sensitive adhesive layer 2 having a thickness of 3 μm.
　さらにその粘着剤層２の上に、離型処理した厚さ２５μｍのポリエステルフィルムを貼り合わせて、４０℃で３日間養生し、総厚１０μｍの両面粘着テープを得た。粘着剤層２の縦筋状の粘着剤部分の幅は０.８ｍｍ、非粘着剤部分の幅は０.５ｍｍ、粘着剤部分の面積の割合は６２％とした。 Further, a 25 μm-thick polyester film having been subjected to a release treatment was bonded onto the pressure-sensitive adhesive layer 2 and cured at 40 ° C. for 3 days to obtain a double-sided pressure-sensitive adhesive tape having a total thickness of 10 μm. The width of the vertical stripe-shaped adhesive part of the adhesive layer 2 was 0.8 mm, the width of the non-adhesive part was 0.5 mm, and the area ratio of the adhesive part was 62%.
　＜実施例５＞
　粘着剤層２の縦筋状の粘着剤部分の幅を４ｍｍ、非粘着剤部分の幅を４ｍｍ、粘着剤部分の面積の割合を５０％としたこと以外は、実施例４と同様にして総厚１０μｍの両面粘着テープを得た。 <Example 5>
In the same manner as in Example 4, except that the width of the vertical stripe-shaped adhesive portion of the adhesive layer 2 was 4 mm, the width of the non-adhesive portion was 4 mm, and the area ratio of the adhesive portion was 50%. A double-sided adhesive tape having a thickness of 10 μm was obtained.
　＜比較例１＞
　基材の両面に全面塗布の厚さ１.５μｍの粘着剤層１を形成したこと以外は、実施例２１と同様にして総厚５μｍの両面粘着テープを作製した。 <Comparative Example 1>
A double-sided pressure-sensitive adhesive tape having a total thickness of 5 μm was prepared in the same manner as in Example 21 except that the pressure-sensitive adhesive layer 1 having a thickness of 1.5 μm was formed on both surfaces of the substrate.
　＜評価＞
　実施例及び比較例で作製した両面粘着テープを、以下の方法で評価した。結果を表１に示す。 <Evaluation>
The double-sided pressure-sensitive adhesive tapes produced in Examples and Comparative Examples were evaluated by the following methods. The results are shown in Table 1.
　（耐たわみ性）
　両面テープの粘着剤層１を厚さ２５μｍのグラファイトシートに２ｋｇローラーで貼り合わせた。さらにグラファイトシートのもう一方の面に厚み５μｍのポリエステルフィルム片面粘着テープ（(株)寺岡製作所製、商品名６３３Ｍ　０．００５黒）を貼り合わせた。次いで、粘着剤層２（比較例１はもう一方の粘着剤層１）を厚さ１.５ｍｍのアクリロニトリル－ブタジエン－スチレン樹脂板（ＡＢＳ板）に２ｋｇローラーで貼り合わせる事で９０×４０ｍｍの大きさの試験片を作製した。この試験片を８５℃雰囲気下で１時間加熱し、温度２３±１℃、湿度５０±５％の雰囲気下で１時間放置し、グラファイトシートとＡＢＳ板との熱収縮率の違いにより発生するグラファイトシートのたわみによるしわの有無を観察し、以下の基準で評価した。
　「○」：しわの発生無し
　「×」：しわの発生有り (Flexibility resistance)
The pressure-sensitive adhesive layer 1 of the double-sided tape was bonded to a graphite sheet having a thickness of 25 μm with a 2 kg roller. Further, a 5 μm thick polyester film single-sided adhesive tape (manufactured by Teraoka Seisakusho, trade name: 633M 0.005 black) was bonded to the other surface of the graphite sheet. Next, the pressure-sensitive adhesive layer 2 (Comparative Example 1 is the other pressure-sensitive adhesive layer 1) is bonded to a 1.5 mm thick acrylonitrile-butadiene-styrene resin plate (ABS plate) with a 2 kg roller so that the size is 90 × 40 mm. A test piece was prepared. This test piece is heated in an atmosphere of 85 ° C. for 1 hour, and left in an atmosphere of a temperature of 23 ± 1 ° C. and a humidity of 50 ± 5% for 1 hour. Graphite generated due to the difference in thermal shrinkage between the graphite sheet and the ABS plate The presence or absence of wrinkles due to sheet deflection was observed and evaluated according to the following criteria.
“○”: No wrinkle occurrence “×”: Wrinkle occurrence
　（粘着力）
　ＪＩＳ－Ｚ－１５２８に準じ、１８０°粘着力（Ｎ／２０ｍｍ幅）を下記手順により測定した。厚さ２５μｍのポリエステルフィルムで裏打ちした両面粘着テープの粘着剤層２（比較例１は粘着剤層１）を温度２３±１℃、湿度５０±５％の雰囲気下にてＳＵＳ板に貼り合わせ、２ｋｇのローラーで一往復圧着し、３０分放置後、引っ張り試験機（東洋精機製作所製、装置名ＳＴＲＯＧＲＡＰＨ　Ｅ－Ｌ）を用いて剥離角度１８０°、剥離速度３００ｍｍ／分の条件でＳＵＳ板より剥離し、粘着力（Ｎ／２０ｍｍ）を測定した。 (Adhesive force)
According to JIS-Z-1528, 180 ° adhesive strength (N / 20 mm width) was measured by the following procedure. Adhesive layer 2 of a double-sided adhesive tape lined with a 25 μm thick polyester film (Comparative Example 1 is adhesive layer 1) was bonded to a SUS plate in an atmosphere of temperature 23 ± 1 ° C. and humidity 50 ± 5%, One reciprocating press with a 2 kg roller, left for 30 minutes, and then peeled off from the SUS plate using a tensile tester (manufactured by Toyo Seiki Seisakusho, device name STRROGRAPH E-L) at a peeling angle of 180 ° and a peeling speed of 300 mm / min. Then, the adhesive strength (N / 20 mm) was measured.
　（貼り合わせ後の気泡の抜け易さ）
　１００×１００ｍｍの両面テープの粘着剤層２（比較例１は粘着剤層１）を硝子板の上に気泡を抱き込むように貼り合わせ、２ｋｇローラーを用いて抱き込んだ気泡を追い出せるかどうかを観察し、以下の基準で評価した。
　「○」：気泡を追い出せる
　「×」：気泡を追い出せない (Ease of bubble removal after bonding)
Adhesive layer 2 of 100 x 100 mm double-sided tape (Comparative example 1 is adhesive layer 1) is bonded to the glass plate so as to embrace the air bubbles, and whether the air bubbles entrained can be driven out using a 2 kg roller. Were observed and evaluated according to the following criteria.
“○”: Can expel bubbles “×”: Cannot expel bubbles
　（熱画像による温度測定）
　両面テープの粘着剤層１を２００×２００ｍｍの大きさ、１８μｍの厚さのグラファイトシートの片面に貼り合わせた。さらにグラファイトシートのもう一方の面に厚さ５μｍのポリエステルフィルム片面粘着テープ（(株)寺岡製作所製、商品名６３３Ｍ　０.００５黒）を貼り合わせた。次いで、両面テープの粘着剤層２（比較例１はもう一方の粘着剤層１）に２００×２００ｍｍの大きさ、１.５ｍｍの厚さのアルミ板に貼り合わせて、試料片とした。温度２３±１℃、湿度５０±５％の雰囲気下で、試験片にアルミ板面から１１０℃の熱源（ＫＩＫＵＳＵＩ社製、装置名ＰＡＳＩＯ－３５）を接触させ、熱源から６０ｍｍの位置の２０分後の試料片表面温度を、グラファイトシート積層品側から熱画像測定装置（アピステ社製、装置名ＦＳＶ－２１０Ｌ）で測定し、熱伝導性を評価した。 (Temperature measurement by thermal image)
The pressure-sensitive adhesive layer 1 of the double-sided tape was bonded to one side of a graphite sheet having a size of 200 × 200 mm and a thickness of 18 μm. Furthermore, a 5 μm thick polyester film single-sided adhesive tape (manufactured by Teraoka Seisakusho, trade name: 633M 0.005 black) was bonded to the other surface of the graphite sheet. Next, the adhesive layer 2 of the double-sided tape (Comparative Example 1 is the other adhesive layer 1) was bonded to an aluminum plate having a size of 200 × 200 mm and a thickness of 1.5 mm to obtain a sample piece. In an atmosphere of temperature 23 ± 1 ° C. and humidity 50 ± 5%, a heat source (KIKUSUI, apparatus name PASIO-35) of 110 ° C. was brought into contact with the test piece from the aluminum plate surface, and 20 minutes at a position 60 mm from the heat source. The surface temperature of the later sample piece was measured with a thermal image measuring device (manufactured by Apiste, device name FSV-210L) from the graphite sheet laminate product side, and the thermal conductivity was evaluated.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示す通り、実施例１～５は耐たわみ性、気泡の抜け易さ、熱伝導性のいずれも良好な特性を有していた。一方、全面塗りで糊面の平滑な比較例１は耐たわみ性、貼り合わせ後の気泡の抜け易さが劣っていた。 As shown in Table 1, Examples 1 to 5 had good properties in all of flexibility, ease of bubble removal, and thermal conductivity. On the other hand, Comparative Example 1 in which the entire surface was coated and the paste surface was smooth was inferior in deflection resistance and ease of bubble removal after bonding.
　なお、実施例１～５の粘着テープの耐たわみ性の評価は全て「〇」（しわの発生無し）であるが、その張り付け後の外観を比較すると、実施例１では粘着剤部分２ａの幅が特に狭いのでパターン模様に起因する表面の凹凸がより少なく、外観がより平滑になるという点で実施例２～５よりもさらに優れていた。また、実施例１～５の粘着テープの何れも、３０×３０ｍｍのサイズの粘着テープに７０℃雰囲気下で１ｋｇの荷重を３日間かけた場合であっても、非粘着剤部分２ｂがつぶれないものであり、張り付け後の粘着剤層には非粘着剤部分が残存していた。 The evaluations of the flex resistance of the pressure-sensitive adhesive tapes of Examples 1 to 5 are all “◯” (no occurrence of wrinkles). When the appearance after pasting is compared, in Example 1, the width of the pressure-sensitive adhesive portion 2a is compared. Was particularly narrow, so that the surface roughness due to the pattern pattern was less, and the appearance was smoother than in Examples 2 to 5. In addition, in any of the adhesive tapes of Examples 1 to 5, the non-adhesive portion 2b is not crushed even when a load of 1 kg is applied to an adhesive tape of 30 × 30 mm size in a 70 ° C. atmosphere for 3 days. The non-adhesive part remained in the adhesive layer after pasting.
　１　粘着剤層
　２　粘着剤層
　２ａ　粘着剤部分
　２ｂ　非粘着剤部分
　３　基材 DESCRIPTION OF SYMBOLS 1 Adhesive layer 2 Adhesive layer 2a Adhesive part 2b Non-adhesive part 3 Base material

Claims (7)

  1. 　基材の両面に粘着剤層を有する粘着テープであって、前記粘着剤層のうち少なくとも片面の粘着剤層は粘着剤が存在する粘着剤部分と粘着剤が存在しない非粘着剤部分とが混在してなり、前記粘着剤層における粘着剤部分の面積の割合が４０～９５％である、放熱シート又は磁性シートと被着体の間の貼り付けに使用される粘着テープ。 A pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on both surfaces of a substrate, and at least one of the pressure-sensitive adhesive layers is a mixture of a pressure-sensitive adhesive portion where a pressure-sensitive adhesive is present and a non-pressure-sensitive adhesive portion where no pressure-sensitive adhesive is present. A pressure-sensitive adhesive tape used for bonding between a heat-dissipating sheet or magnetic sheet and an adherend, wherein the ratio of the area of the pressure-sensitive adhesive portion in the pressure-sensitive adhesive layer is 40 to 95%.
  2. 　粘着剤層の粘着剤部分が島状又は筋状である請求項１記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive portion of the pressure-sensitive adhesive layer has an island shape or a stripe shape.
  3. 　粘着剤層の厚さが０.５～７μｍである請求項１記載の粘着テープ。 2. The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive layer has a thickness of 0.5 to 7 μm.
  4. 　隣り合う粘着剤部分の隙間が０.０１～１ｍｍである請求項１記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein a gap between adjacent pressure-sensitive adhesive parts is 0.01 to 1 mm.
  5. 　基材の厚さが１～７５μｍである請求項１記載の粘着テープ。 The pressure-sensitive adhesive tape according to claim 1, wherein the thickness of the substrate is 1 to 75 µm.
  6. 　粘着テープの厚さが４～８５μｍである請求項１記載の粘着テープ。 2. The adhesive tape according to claim 1, wherein the thickness of the adhesive tape is 4 to 85 μm.
  7. 　請求項１記載の粘着テープの粘着剤層側と、放熱シート又は磁性シートとを貼り付けてなる積層体であって、貼り付け後の粘着テープの粘着剤層に非粘着剤部分が残存している積層体。 It is a laminate formed by adhering the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive tape according to claim 1 and a heat dissipation sheet or a magnetic sheet, and a non-adhesive part remains in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape after the application. Laminated body.
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KR102569970B1 (en) 2023-08-23
CN107001868A (en) 2017-08-01

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