CN117586701A - Adhesive composition for patterned adhesive tape, and method for producing patterned adhesive tape - Google Patents

Abstract

The problem to be solved by the present invention is to provide a thin patterned adhesive tape and a patterned adhesive tape that can quickly discharge air bubbles from the interface with an adherend, prevent air bubbles from remaining at the interface, and have excellent adhesive force. Adhesive composition. The adhesive composition for patterned adhesive tapes of the present invention has an elongational viscosity of 1,000 mPa·s or more and 650,000 mPa·s or less when measured at 30°C, or a Truton ratio of 8 or more when measured at 30°C. And below 400. The patterned adhesive tape has an adhesive layer. The adhesive layer has two or more adhesive portions (B) and a non-adhesive portion region without an adhesive portion (B) between the two or more adhesive portions (B). The adhesive area is in a pattern shape that communicates with the outer periphery of the sheet plane.

Description

Adhesive composition for patterned adhesive tape, patterned adhesive tape and manufacturing method thereof

Technical field

The present invention relates to an adhesive composition for a patterned adhesive tape, a patterned adhesive tape and a manufacturing method thereof.

Background technique

Since the adhesive tape has excellent workability and high bonding reliability, it is widely used in manufacturing sites of electronic equipment such as OA equipment and home appliances.

In recent years, the above-mentioned electronic devices have been required to be highly functional, miniaturized, and thin. In particular, portable electronic terminals such as personal computers, digital cameras, electronic notepads, mobile phones, PHS, smart phones, game consoles, and e-books have been required to be further enhanced. miniaturization and thinness. Along with this, adhesive tapes and the like constituting the portable electronic terminal are also required to be thinned.

As the thin adhesive tape, for example, a double-sided adhesive tape is known which has acrylic acid with a weight average molecular weight of 700,000 or more and a butyl acrylate unit content of 90 mass % or more on both sides of a core material. A double-sided adhesive tape with an adhesive layer in which an ester copolymer and a tackifier are the main components and the content of the tackifier is 40% to 60% by mass, and the core material and the double-sided adhesive layer are The total total thickness is 30 μm or less, and the thickness of the adhesive layer on both sides is 2 μm to 10 μm (for example, see Patent Document 1).

However, when the above-mentioned thin adhesive tape is bonded to an adherend, air bubbles tend to remain at the interface between them. As a result, appearance defects such as expansion of the adhesive tape may occur.

In addition, since the above-mentioned remaining air bubbles act as thermal resistance, when the above-mentioned thin adhesive tape is used for bonding a heat dissipation member and a heat generating member, etc., the heat dissipation performance may be reduced.

In addition, in order to realize the above-mentioned thinning, thinning of the adhesive layer has also been studied. However, in a thin adhesive layer provided only with the escape path of the above-mentioned bubbles, it is sometimes impossible to maintain a practically sufficient adhesive force.

existing technical documents

patent documents

Patent Document 1: Japanese Patent Application Publication No. 2007-169327

Contents of the invention

The technical problem to be solved by the invention

An object to be solved by the present invention is to provide a patterned adhesive tape that can quickly discharge air bubbles from the interface with an adherend, prevent air bubbles from remaining at the interface, and have excellent adhesive force.

Technical solutions for solving technical problems

The content of this disclosure includes the following embodiments.

[1] An adhesive composition for a patterned adhesive tape used for forming a patterned adhesive tape, wherein:

The adhesive composition for patterned adhesive tapes has an elongational viscosity of 1,000 mPa·s or more and 650,000 mPa·s or less when measured at 30°C.

The above patterned adhesive tape has an adhesive layer,

The adhesive layer has two or more adhesive portions (B), and a non-adhesive portion region having no adhesive portion (B) between the two or more adhesive portions (B),

The non-adhesive portion region has a pattern shape that communicates with the outer periphery of the sheet plane.

[2] An adhesive composition for a patterned adhesive tape used for forming a patterned adhesive tape, wherein:

The above-mentioned adhesive composition for patterned adhesive tapes has a Truton ratio of 8 or more and 400 or less when measured at 30°C,

The above patterned adhesive tape has an adhesive layer,

The adhesive layer has two or more adhesive portions (B), and a non-adhesive portion region having no adhesive portion (B) between the two or more adhesive portions (B),

The non-adhesive portion region has a pattern shape that communicates with the outer periphery of the sheet plane.

[3] A patterned adhesive tape including a support (A) and an adhesive layer,

The above-mentioned adhesive layer is formed using the adhesive composition for patterned adhesive tapes described in [1] or [2],

The adhesive layer has two or more adhesive portions (B), and a non-adhesive portion region having no adhesive portion (B) between the two or more adhesive portions (B),

The non-adhesive portion region has a pattern shape that communicates with the outer periphery of the sheet plane.

[4] The patterned adhesive tape according to [3], wherein the shape of the adhesive portion (B) when the adhesive portion (B) is viewed from one surface (a) side of the support (A) It is approximately circular, approximately quadrilateral or approximately hexagonal.

[5] The patterned adhesive tape according to [3] or [4], wherein any adhesive portion (b1) selected from the two or more adhesive portions (B) and an adjacent adhesive portion (b1) are The distance between the adhesive portion (b2) of b1) is 0.5 mm or less.

[6] The patterned adhesive tape according to [3] to [5], wherein the area having the adhesive portion (B) occupies an area of one surface (a) of the support (A). The ratio is 10% to 99%.

[7] The patterned adhesive tape according to [3] to [6], wherein a smooth stainless steel plate is placed on the surface having the adhesive portion (B) and pressed with a 2kg roller by reciprocating once. The test piece was obtained by leaving it for 1 hour under the conditions of 23° C. and 50% RH. The 180° peeling adhesive force measured using this test piece was in the range of 1N/20mm to 12N/20mm.

[8] A method for producing a patterned adhesive tape, which includes forming an adhesive layer on the surface of a support (A) using the adhesive composition for a patterned adhesive tape described in [1] or [2] The adhesive layer forming process,

The adhesive layer has two or more adhesive portions and a non-adhesive portion region having no adhesive portion (B) between the two or more adhesive portions (B).

[9] The method for manufacturing a patterned adhesive tape according to [8], wherein in the adhesive layer forming step, at least one surface of the support (A) is formed by a gravure printing method or a screen printing method. The adhesive composition for patterned adhesive tapes is applied to form two or more substantially circular, substantially quadrangular or substantially hexagonal adhesive portions (B).

Invention effect

The patterned adhesive tape of the present invention quickly discharges bubbles from the interface with the adherend, makes it difficult for bubbles to remain at the interface, and has excellent adhesive strength.

Description of drawings

FIG. 1 is a plan view of a patterned adhesive tape having a substantially rhombus-shaped adhesive portion as viewed from the adhesive portion side.

FIG. 2 is a plan view of a patterned adhesive tape having a substantially circular adhesive portion as viewed from the adhesive portion side.

3 is a plan view of a patterned adhesive tape having a substantially hexagonal adhesive portion as viewed from the adhesive portion side.

4 is a plan view of a patterned adhesive tape having a substantially linear adhesive portion as viewed from the adhesive portion side.

Figure 5 is a side view of the graphite composite sheet.

Detailed ways

(Adhesive composition for patterned adhesive tape)

The adhesive composition for a patterned adhesive tape according to one embodiment of the present invention (sometimes referred to as the adhesive composition according to this embodiment) is used to form a patterned adhesive tape described below.

The patterned adhesive tape has an adhesive layer, the adhesive layer has two or more adhesive parts (B), and there is no adhesive part (B) between the two or more adhesive parts (B). The non-adhesive portion area is in a pattern shape that communicates with the outer periphery of the sheet plane.

In one embodiment, the adhesive composition of this embodiment has an elongational viscosity when measured at 30° C. of 1,000 mPa·s or more and 650,000 mPa·s or less.

In order for the above-mentioned patterned adhesive tape to quickly discharge air bubbles from the interface with the adherend and to make it difficult for air bubbles to remain at the interface, it is required that the non-adhesive portion region serving as the air bubble discharge flow path is free from deformation of the adhered portion (B), etc. clogged. On the other hand, in order to express excellent adhesive force in the above-mentioned patterned adhesive tape, it is required that the adhesive portion be formed with a stable size and a sufficient bonding area be obtained by the adhesive portion.

The adhesive composition of this embodiment has an elongational viscosity when measured at 30° C. within a predetermined range, thereby preventing the non-adhesive portion region from being clogged with the adhesive composition during formation of the adhesive portion. In addition, an adhesive portion with excellent shape accuracy and shape retention can be formed. Therefore, the patterned adhesive tape formed using the adhesive composition of this embodiment can achieve both good bubble discharge and adhesive force.

In one embodiment, the adhesive composition of the present embodiment has a Truton ratio of 8 or more and 400 or less when measured at 30°C.

In order for the above-mentioned patterned adhesive tape to quickly discharge air bubbles from the interface with the adherend and to make it difficult for air bubbles to remain at the interface, it is required that the non-adhesive portion region serving as the air bubble discharge flow path is free from deformation of the adhered portion (B), etc. clogged. On the other hand, in order to express excellent adhesive force in the above-mentioned patterned adhesive tape, it is required to form the adhesive portion with a stable size and to obtain a sufficient bonding area by the adhesive portion.

The adhesive composition of this embodiment can prevent the non-adhesive portion region from being clogged by the adhesive composition during formation of the adhesive portion by setting the Truton ratio when measured at 30° C. within a predetermined range. In addition, an adhesive portion with excellent shape accuracy and shape retention can be formed. Therefore, the patterned adhesive tape formed using the adhesive composition of this embodiment can achieve both good bubble discharge and adhesive force.

The elongational viscosity of the adhesive composition of the present embodiment when measured at 30° C. is preferably 1,000 mPa·s or more and 650,000 mPa·s or less, more preferably 10,000 mPa·s or more and 450,000 mPa·s or less, and still more preferably 50,000 mPa·s or more. And below 350000mPa·s.

When forming a patterned adhesive tape, by using the adhesive composition of this embodiment with an elongational viscosity of 1000 mPa·s or more when measured at 30° C., an adhesive tape having excellent shape accuracy and shape retention can be formed. department. In particular, when the adhesive portion is formed using various printing methods, the adhesive composition has excellent transferability from the printing plate and the shape retention of the transferred adhesive portion. By using the adhesive composition of this embodiment whose elongational viscosity measured at 30° C. is 650,000 mPa·s or less when forming a patterned adhesive tape, regardless of the type of printing method for applying the adhesive composition, In both cases, an adhesive portion with good shape accuracy can be easily formed. Especially when a printing plate is used to form an adhesive portion, the adhesive portion formed by dot transfer can be easily formed with a small error in the shape and size of the adhesive portion relative to the shape and size of the dots on the plate.

In the method of producing the patterned adhesive tape described below, when the method of applying the adhesive composition of the present embodiment is a gravure printing method, the elongational viscosity when measured at 30° C. is preferably 1000 mPa· s or more and 650000 mPa·s or less, among which, it is preferably 1000 mPa·s or more and 500000 mPa·s or less, more preferably 1000 mPa·s or more and 75000 mPa·s or less, and still more preferably 1300 mPa·s or more and 20000 mPa·s or less.

By setting the elongational viscosity of the adhesive composition used in the gravure printing method within the above range, the adhesive composition can easily flow out from the recessed portion of the gravure plate corresponding to the adhesive portion, and the adhesive composition can be easily transferred. to support, release liner. In addition, the adhesive portion formed by transferring the adhesive composition to the support (adhesive portion after transfer) has excellent shape retention and dimensional accuracy.

In the method of producing the patterned adhesive tape described below, when the method of applying the adhesive composition of this embodiment is a screen printing method, the elongational viscosity when measured at 30°C is preferably 1000 mPa· s or more and 650000 mPa·s or less, of which it is preferably 50000 mPa·s or more and 650000 mPa·s or less, and more preferably 100000 mPa·s or more and 650000 mPa·s or less.

By setting the elongational viscosity of the adhesive composition used in the screen printing method within the above range, the adhesive composition can be held in the holes of the screen plate corresponding to the adhesive portion, and the adhesive composition can be transferred during transfer. Since it easily flows out from the holes, the adhesive composition can be easily transferred to the support or release liner. In addition, the bonded portion after transfer has excellent shape retention and dimensional accuracy.

The Troughton ratio of the adhesive composition of this embodiment when measured at 30° C. is 8 or more and 400 or less, more preferably 25 or more and 375 or less, and still more preferably 100 or more and 350 or less.

When forming a patterned adhesive tape, by using the adhesive composition of this embodiment with a Trouton ratio of 8 or more when measured at 30° C., an adhesive portion with excellent shape accuracy and shape retention can be formed. . In particular, when the adhesive portion is formed using various printing methods, the adhesive composition has excellent transferability from the printing plate and the shape retention of the transferred adhesive portion. By using the adhesive composition of this embodiment which has a Truton ratio of 400 or less when measured at 30° C. when forming a patterned adhesive tape, it is possible to apply the adhesive composition regardless of the type of printing method. The bonded portion with good shape accuracy can be easily formed. Especially when a printing plate is used to form an adhesive portion, the adhesive portion formed by dot transfer can be easily formed with a small error in the shape and size of the adhesive portion relative to the shape and size of the dots on the plate.

In the method of producing the patterned adhesive tape described below, when the method of applying the adhesive composition of the present embodiment is a gravure printing method, the Truton ratio when measured at 30° C. is preferably 8 or more. And 400 or less, among them, it is preferably 8 or more and 333 or less, more preferably 8 or more and 144 or less, and still more preferably 9.3 or more and 100 or less.

By setting the Trouton ratio of the adhesive composition used in the gravure printing method within the above range, the adhesive composition can easily flow out from the recessed portion of the intaglio plate corresponding to the adhesive portion, and the adhesive can be easily combined. Transfer to support, release liner. In addition, the bonded portion after transfer has excellent shape retention and dimensional accuracy.

In the method of producing the patterned adhesive tape described below, when the method of applying the adhesive composition of the present embodiment is a screen printing method, the Truton ratio when measured at 30° C. is preferably 8 160 to 400, of which 160 to 400 is preferred, 200 to 400 is more preferred, and 250 to 400 is still more preferred.

By setting the Truton ratio of the adhesive composition used in the screen printing method within the above range, the adhesive composition can be held in the holes of the screen plate corresponding to the adhesive portion, and the adhesive composition can be transferred during transfer. The composition easily flows out from the holes, so the adhesive composition can be easily transferred to the support or release liner. In addition, the bonded portion after transfer has excellent shape retention and dimensional accuracy.

The adhesive composition of this embodiment has at least one of the above-described range of elongational viscosity and the range of Trouton ratio. Among these, it is more preferable that the adhesive composition of this embodiment has the above-mentioned extensional viscosity range and has the above-mentioned Truton ratio range.

Examples of the adhesive composition of this embodiment include an acrylic adhesive composition, a rubber adhesive composition, a silicone adhesive composition, and a urethane adhesive composition. , polyester-based adhesive composition, styrene-diene block copolymer-based adhesive composition, vinyl alkyl ether-based adhesive composition, polyamide-based adhesive composition, fluorine-based adhesive composition Well-known adhesive compositions such as mixture compositions, creep property-modified adhesive compositions, and radiation-curable adhesive compositions. Among them, a patterned adhesive tape formed using an acrylic adhesive composition has excellent bonding reliability, so the adhesive composition of the present embodiment is preferably an acrylic adhesive composition.

[Acrylic adhesive composition]

As the acrylic adhesive composition, a composition containing an acrylic polymer can be used.

＜Acrylic polymer＞

As the acrylic polymer, a polymer obtained by polymerizing a monomer component containing a (meth)acrylic monomer such as an alkyl (meth)acrylate can be used.

Examples of the alkyl (meth)acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, and (meth)acrylate. )Butyl acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, amyl (meth)acrylate, hexyl (meth)acrylate, (meth)acrylate cyclohexyl acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate Ester, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, Tridecyl (meth)acrylate, myristyl (meth)acrylate, pentadecyl (meth)acrylate, cetyl (meth)acrylate, tendecyl (meth)acrylate Heptadecyl ester, stearyl (meth)acrylate, nonadecyl (meth)acrylate, eicosanyl (meth)acrylate, etc. are used alone or in combination of two or more. Among them, as the (meth)acrylic acid alkyl ester, it is preferable to use the (meth)acrylic acid alkyl ester having the carbon number of the above-mentioned alkyl group from 1 to 20, and more preferably to use the alkyl (meth)acrylate having the above-mentioned alkyl group having the carbon number of 4 to 18. Alkyl (meth)acrylates. Examples of the alkyl group include linear or branched alkyl groups.

Butyl (meth)acrylate is used as an alkyl (meth)acrylate having a carbon number of 4 to 18 in the alkyl group. This makes it easier to maintain the surface shape of the adhesive layer (the surface shape of the adhesive portion). ), it is preferable from the viewpoint of obtaining a patterned adhesive tape that can easily prevent changes over time, easily eject air bubbles from the interface with the adherend (outgassing property), and can maintain good adhesive force.

The content of the alkyl (meth)acrylate is preferably in the range of 80 to 98.5% by mass, and more preferably in the range of 90 to 98.5% by mass in the total amount of monomers constituting the acrylic copolymer. Among them, the content of the alkyl (meth)acrylate having an alkyl group having 4 to 18 carbon atoms is preferably within the above range. This is because the adhesive portion maintains good adhesion.

As the above-mentioned (meth)acrylic acid monomer, in addition to the above-mentioned monomers, monomers having carboxyl groups such as (meth)acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, or the like may also be used. Its acid anhydride; monomers with sulfonic acid groups such as sodium vinyl sulfonate; monomers with cyano groups such as acrylonitrile; acrylamide, methacrylamide, N-vinylpyrrolidone, N,N-dimethyl (methyl monomers with amide groups such as acrylamide; monomers with hydroxyl groups such as hydroxyalkyl (meth)acrylate and glycerol dimethacrylate; aminoethyl (meth)acrylate, (meth)acryloyl Monomers with amino groups such as morpholine; monomers with imide groups such as cyclohexylmaleimide and isopropylmaleimide; glycidyl (meth)acrylate, methyl (meth)acrylate Monomers with epoxy groups such as glycidyl ester; monomers with isocyanate groups such as 2-methacryloyloxyethyl isocyanate; triethylene glycol di(meth)acrylate, diethylene glycol di( Meth)acrylate, ethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate Monomers such as meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and divinylbenzene are used alone or in combination Two or more types.

Among them, the acrylic polymer preferably contains a monomer having a carboxyl group as a monomer component. The content of the monomer having a carboxyl group is preferably 0.2 mass% to 15 mass%, more preferably 0.4 mass% to 10 mass%, and even more preferably 0.5 mass% to 6 mass% in the total amount of monomers constituting the acrylic copolymer. This is because when the content of the monomer having a carboxyl group is within the above range, when the adhesive portion is formed, the adhesive portion can express appropriate cohesive force and the adhesiveness becomes good.

In addition, the acrylic polymer preferably contains a monomer having a hydroxyl group as a monomer component. The content of the monomer having a hydroxyl group is preferably 0.01% by mass to 1.0% by mass, and more preferably 0.03% by mass to 0.3% by mass in the total amount of monomers constituting the acrylic copolymer. When the content of the monomer having a hydroxyl group is within the above range, the adhesive portion formed of the adhesive composition can exhibit good adhesiveness, and further, the coating properties and printability of the adhesive composition can be improved without hindering the adhesive composition. The viscosity is improved under the circumstances.

In addition, as the above-mentioned monomer, in addition to the above-mentioned (meth)acrylic acid monomer, aromatic vinyl compounds such as styrene and substituted styrene; olefins such as ethylene, propylene, butadiene; and ethylene such as vinyl acetate can also be used. esters; vinyl chloride, etc.

The above-mentioned acrylic polymer can be produced by polymerizing the above-mentioned monomer using a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method, or the like. From the viewpoint of improving the production efficiency of the acrylic polymer, the solution polymerization method is preferably used.

Examples of the solution polymerization method include a method of mixing and stirring the above-mentioned monomer, a polymerization initiator, and an organic solvent at a temperature of preferably 40° C. to 90° C. to perform radical polymerization.

Examples of the polymerization initiator that can be used include peroxides such as benzoyl peroxide and lauroyl peroxide, azo thermal polymerization initiators such as azobisisobutyronitrile, acetophenone photopolymerization initiators, benzoyl peroxide, etc. Indium ether-based photopolymerization initiators, benzyl ketal-based photopolymerization initiators, acylphosphine oxide-based photopolymerization initiators, benzoin-based photopolymerization initiators, benzophenone-based photopolymerization initiators, etc.

The acrylic polymer obtained by the above method may be in a state of being dissolved or dispersed in an organic solvent, for example, when produced by a solution polymerization method.

As the acrylic polymer obtained by the above method, it is preferable to use an acrylic polymer having a weight average molecular weight of 300,000 to 1.2 million, and more preferably to use an acrylic polymer having a weight average molecular weight of 400,000 to 1.1 million, so that even a thin From the viewpoint of providing a patterned adhesive tape with more excellent adhesive force and ease of bubble removal, it is preferable to use an acrylic polymer having a weight average molecular weight of 500,000 to 1,000,000.

In addition, the said weight average molecular weight refers to the value calculated by measuring by gel permeation chromatography (GPC method) and converting to standard polystyrene. Specifically, the weight average molecular weight can be measured under the following conditions using a GPC device (HLC-8329GPC) manufactured by Tosoh Corporation.

Sample concentration: 0.5 mass% (tetrahydrofuran solution)

Sample injection volume: 100μL

Eluent: tetrahydrofuran

Flow rate: 1.0ml/minute

Measuring temperature: 40℃

This column: TSKgel GMHHR-H (20) 2 pieces

Guard column: TSKgel HXL-H

Detector: Differential Refractometer

Weight average molecular weight of standard polystyrene: 10,000 to 20 million (manufactured by Tosoh Corporation)

As the adhesive composition of this embodiment, it is preferable to use an adhesive composition containing a tackifier resin in order to form an adhesive portion having more excellent adhesive force, tensile strength, and tensile breaking strength.

As the above-mentioned tackifying resin, for example, rosin-based tackifying resin, polymerized rosin-based tackifying resin, polymerized rosin ester-based tackifying resin, rosin phenol-based tackifying resin, stabilized rosin ester-based tackifying resin, and disproportionated rosin ester-based tackifying resin can be used. Petroleum resin-based tackifying resins such as tackifying resins, hydrogenated rosin ester-based tackifying resins, terpene-based tackifying resins, terpene phenolic-based tackifying resins, and styrene-based tackifying resins.

As the above-mentioned tackifying resin, in order to obtain a patterned adhesive tape having superior adhesive strength and easy removal of air bubbles even if it is thin, it is preferable to use a combination of a rosin-based tackifying resin and a petroleum resin-based tackifying resin. The above-mentioned rosin-based tackifying resin and petroleum resin-based tackifying resin are particularly preferably used in combination with the above-mentioned acrylic polymer. When used in combination with an acrylic polymer obtained by polymerizing a monomer containing butyl (meth)acrylate, even It is a thin adhesive tape and has better adhesive strength and easier removal of air bubbles, so it is preferable.

In addition, as the tackifying resin, it is preferable to use a tackifying resin that is liquid at normal temperature in order to further improve the initial adhesive strength of the adhesive portion (B). Examples of tackifier resins that are liquid at room temperature include process oils, polyester plasticizers, and low molecular weight liquid rubbers such as polybutene. Terpene phenolic resins can be used, and commercially available products include YASUHARA. CHEMICAL Company manufactures YP-90L, etc.

The above-mentioned tackifying resin is preferably used in the range of 20 to 60 parts by mass relative to 100 parts by mass of the above-mentioned acrylic polymer. In order to obtain a patterned adhesive tape with more excellent adhesive force, it is more preferably used in the range of 30 parts by mass. Use in the range of parts to 55 parts by mass.

In addition, as the adhesive composition constituting the adhesive part (B), in addition to the above-mentioned acrylic polymer, etc., it is also possible to use an adhesive composition containing a softener, a plasticizer, a filler, an anti-aging agent, a colorant, etc. as needed. combination.

When a cross-linking agent is used, the gel fraction of the adhesive portion (B) can be adjusted to an appropriate range. As a result, the shape of the adhesive portion (B) can be easily maintained and changes over time can be easily prevented. It is preferable because air bubbles can be easily removed from the interface between the adherend and the adhesive portion (B) and a patterned adhesive tape having excellent adhesive force can be obtained.

As the cross-linking agent, for example, an isocyanate cross-linking agent or an epoxy cross-linking agent is preferably used.

As the isocyanate crosslinking agent, for example, toluene diisocyanate, naphthalene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and trimethylolpropane can be used. Modified toluene diisocyanate, etc., preferably toluene diisocyanate adducts such as toluene diisocyanate and trimethylolpropane-modified toluene diisocyanate are used. The toluene diisocyanate adduct is a substance having a structure derived from toluene diisocyanate in the molecule, and examples of commercially available products include Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.).

When using the isocyanate crosslinking agent, it is preferable to use an acrylic polymer having a hydroxyl group as the acrylic polymer. As the monomer used when producing the acrylic polymer having a hydroxyl group, for example, 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 6-(meth)acrylate can be used. Hydroxyhexyl ester, etc., more preferably 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are used.

In addition, as the epoxy cross-linking agent, for example, TETRAD-X and TETRAD-C manufactured by Mitsubishi Gas Chemical Co., Ltd., or E-05X manufactured by Soken Chemical Co., Ltd., etc. can be used.

When using the above-mentioned epoxy cross-linking agent, it is preferable to use an acrylic polymer having an acid group as the above-mentioned acrylic polymer. As the monomer used when producing the acrylic polymer having an acid group, for example, (meth)acrylic acid, acrylic acid dimer, itaconic acid, crotonic acid, maleic acid, maleic anhydride, etc. are preferably used, and more preferably (Methacrylate.

As the adhesive composition of this embodiment, it is preferable to use a composition containing a solvent if necessary. As the above-mentioned adhesive composition, depending on the formation method of the adhesive part, an adhesive composition prepared with a shear viscosity in the range of 125 mPa·s to 1625 mPa·s can be used, and it is preferable to use one with a shear viscosity in the range of 400 mPa·s to 1200 mPa·s. The adhesive composition prepared in the range of s is more preferable, and the adhesive composition prepared in the range of 500 mPa·s to 1000 mPa·s is more preferable since it is easy to form the adhesive part (B) of a predetermined shape.

In the method of forming a patterned adhesive tape described below using the adhesive composition of the present embodiment, when the gravure printing method is used as the forming method of the adhesive portion, as the adhesive composition, it is possible to use An adhesive composition prepared with a shear viscosity in the range of 125 mPa·s to 1500 mPa·s. It is preferable to use an adhesive composition prepared in the range of 125 mPa·s to 520 mPa·s, and to use an adhesive composition prepared in the range of 140 mPa·s to 200 mPa·s. The transfer of the adhesive composition from the printing plate It is more preferable because it has good properties and is easy to form an adhesive portion (B) of a predetermined shape.

In addition, in the method of forming a patterned adhesive tape described below using the adhesive composition of the present embodiment, when the screen printing method is used as the formation method of the adhesive portion, as the above-mentioned adhesive composition, An adhesive composition prepared with a shear viscosity in the range of 500 mPa·s to 1625 mPa·s can be used, and preferably an adhesive composition prepared in a range of 1000 mPa·s to 1625 mPa·s is used. A pressure-sensitive adhesive composition prepared in the range of s to 1625 mPa·s is more preferable because the pressure-sensitive adhesive composition has good transferability from the printing plate and can easily form the adhesive portion (B) of a predetermined shape.

The content of non-volatile components in the adhesive composition of the present embodiment is not particularly limited as long as it has the desired elongational viscosity and/or Trouton ratio. For example, it is preferably 15% by mass or more, and more preferably 20% by mass. Above, more preferably 25% by mass or more. In addition, the content of the non-volatile components is preferably less than 40% by mass, preferably 38% by mass or less, and more preferably 35% by mass or less. By setting the content of non-volatile components of the adhesive composition within the above range, the adaptability to various printing methods when forming an adhesive portion (the transferability of the adhesive composition from the printing plate and the adhesive portion after transfer shape retention, etc.) is excellent.

(Patterned adhesive tape)

A patterned adhesive tape according to one embodiment of the present invention (sometimes referred to as the adhesive tape according to this embodiment) has a support (A) and an adhesive layer having two or more adhesive portions ( There is a non-adhesive portion region without an adhesive portion (B) between B) and the above two or more adhesive portions (B). The non-adhesive portion region has a pattern shape that communicates with the outer periphery of the sheet plane.

Specific examples of the adhesive tape according to this embodiment include a patterned adhesive tape having two or more adhesive portions (B) directly on at least one surface (a) side of the support (A), or A patterned adhesive tape having the adhesive portion (B) on at least one surface (a) side of the support (A) via other layers.

When using a double-sided patterned pressure-sensitive adhesive tape as the pressure-sensitive adhesive tape of this embodiment, it is possible to use two or more of the above-mentioned specific adhesive parts (a) on both sides (a) of the support (A) B), there is an area without an adhesive section (B) between the two or more adhesive sections (B), and the above-mentioned area has a double-sided adhesive structure connected to the end of the patterned adhesive tape. A tape or a tape having two or more specific adhesive parts (B) on one surface (a) side of the support (A), and there are no adhesive parts (B) between the two or more adhesive parts (B). The area of the adhesive portion (B) has a structure that communicates with the end of the patterned adhesive tape, and has an adhesive ( Adhesive layer) double-sided adhesive tape.

The non-adhesive portion region that does not have an adhesive portion (B) between the above two or more adhesive portions (B) means that the components constituting the above-mentioned adhesive portion (B) do not exist, or can be in such a manner that no adhesive portion is exerted. area where the degree of compatibility exists. Therefore, when the adhesive tape of this embodiment is viewed from the side direction, it is observed that the adhesive portion (B) forms a convex shape with respect to the surface (a) of the support (A).

Moreover, the adhesive tape of this embodiment has the area|region which does not have an adhesive part (B) between the said two or more adhesive parts (B), and a part of the edge part (outer edge part) of a patterned adhesive tape. Connected structures. By using the patterned adhesive tape having the above structure, when the patterned adhesive tape is attached to an adherend, air bubbles are discharged to the outside from the interface between the patterned adhesive tape and the adherend through the above-mentioned area, so it is possible to prevent It eliminates appearance defects caused by expansion of the patterned adhesive tape and maintains excellent thermal conductivity, adhesive strength, etc.

As the adhesive tape of this embodiment, it is preferable to use an adhesive tape with a total thickness of 50 μm or less. Among them, an adhesive tape with a total thickness of 20 μm or less is preferably used, an adhesive tape with a thickness of 2 μm to 15 μm is more preferably used, and an adhesive tape of 3 μm to 10 μm is even more preferably used. As an adhesive tape, for example, in terms of contributing to thinning of portable electronic terminals and the like, it is particularly preferable to use an adhesive tape having a thickness of 3 μm to 6 μm. When the support (A) of the adhesive tape of this embodiment contains a foam, the total thickness of the adhesive tape of this embodiment is preferably 300 μm or less, more preferably 30 μm to 250 μm, and even more preferably 50 μm to 200 μm. , for example, in terms of contributing to thinning of portable electronic terminals and the like, 50 μm to 100 μm is particularly preferred. Even if the adhesive tape of this embodiment is very thin as described above, it maintains excellent bubble discharge ease and has excellent adhesive force and thermal conductivity. It should be noted that the total thickness of the above patterned adhesive tape refers to the pattern measured using a dial gauge in accordance with JIS K6783, with the contact surface of the dial gauge being a flat surface, a diameter of 5 mm, and a load of 1.23 N. The thickness of the adhesive tape, excluding the thickness of the release liner. The thickness can be measured, for example, with a thickness meter TH-102 manufactured by TESTER Industrial Co., Ltd.

As the adhesive tape of this embodiment, it is preferable to use an adhesive tape having an adhesive force (180° peeling adhesive force) of 1N/20mm to 12N/20mm, and more preferably to use an adhesive tape having an adhesive force of 1.5N/20mm to 10N/20mm. For the relay adhesive tape, in order to obtain a patterned adhesive tape that can easily remove air bubbles from the interface between the adherend and the patterned adhesive tape and has excellent adhesive force even if it is thin, it is preferable to use a tape with 3N/ Adhesive tape with an adhesive force of 20mm～8N/20mm. When further excellent adhesiveness is required, it is preferable to use a patterned adhesive tape having an adhesive force of 4N/20mm to 10N/20mm as the above-mentioned patterned adhesive tape, and more preferably use a patterned adhesive tape having an adhesive force of 4.5N/20mm. Patterned adhesive tape with an adhesive force of ~8N/20mm.

In addition, the said adhesive force (180 degree peeling adhesive force) refers to the value measured in accordance with JISZ0237. Specifically, the above-mentioned adhesive force is a value measured by connecting the surface having the adhesive portion (B) of a patterned adhesive tape backed with a polyethylene terephthalate film having a thickness of 25 μm and Clean and smooth stainless steel plates (BA plates) are overlapped, and a 2kg roller is used to reciprocate once on the upper surface to pressurize the sample. The pressurized sample is placed at 23°C and 50% RH for 1 hour or 24 hours. Then, the patterned adhesive tape was peeled off in the 180° direction at a speed of 0.3m/min. In addition, the said lining is performed on the surface which does not have the said adhesive part (B), and is not performed on the surface which has the adhesive part (B) which is a component of this invention. Moreover, when the said patterned adhesive tape has the said adhesive part (B) on both sides, any surface which has the adhesive part (B) is lined.

Even if the adhesive tape of this embodiment is thin, it can prevent peeling over time and detachment of parts caused by the repulsive force of the adherend and the support (A), etc., especially even if it is used at a relatively high temperature. In order to prevent the above-mentioned peeling, it is preferable to use an adhesive tape with an adhesive retention strength of 2 mm or less, more preferably an adhesive tape of 0.5 mm or less, and still more preferably an adhesive tape of 0.1 mm or less.

In addition, the above-mentioned adhesive holding force refers to the value measured in accordance with JISZ0237. Specifically, the above-mentioned adhesive holding force is a value obtained by connecting the surface having the adhesive portion (B) of a patterned adhesive tape lined with aluminum foil with a thickness of 50 μm and a clean and smooth stainless steel plate (thin stainless steel plate). Lines) were overlapped, and a 2kg roller was used to reciprocate once on the upper surface to pressurize. The pressurized sample was left for 1 hour under the conditions of 23° C. and 50% RH, and the obtained sample was used as a test piece. Next, in an environment of 100°C, the stainless steel plate constituting the test piece was fixed in the vertical direction, and left for 24 hours with a load of 100g applied to the lower end of the patterned adhesive tape constituting the test piece. Use a vernier caliper to measure the offset distance between the stainless steel plate and the patterned adhesive tape.

[Support (A)]

The support (A) constituting the adhesive tape of this embodiment can be appropriately set according to the type of the support (A). For example, if the support (A) is a resin film, it is preferable to use one with a thickness of 1 μm to 20 μm. As the support, it is more preferred to use a support having a thickness of 1 μm to 10 μm, still more preferably a support having a thickness of 1 μm to 4 μm, and even more preferably a support having a thickness of 1.5 μm to 2.5 μm. In addition, if the support (A) is a foam sheet, a foam sheet having a thickness of 250 μm or less, more preferably 30 μm to 200 μm, and even more preferably 50 μm to 100 μm can be used. By setting the thickness of the support (A) within the above range, the patterned adhesive tape can be made thinner, and air bubbles can be easily removed from the interface between the surface having the adhesive portion (B) and the adherend. As a result, , can more effectively prevent poor appearance, thermal conductivity, adhesive force and other performance degradation caused by expansion of the patterned adhesive tape.

As the support (A), for example, a sheet-shaped support obtained using resin can be used. Specific examples of the sheet-shaped support (A) obtained using resin include non-foamed resin films, foam sheets, and the like.

Examples of the resin that can be used in the production of the support (A) include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polyethylene terephthalate. Polyesters such as butylene glycol ester (PBT), polyamide (nylon), fully aromatic polyamide (aramid) and other amide resins, polybutyl acrylate, polyethyl acrylate, polymethyl methacrylate ( Acrylic resins such as PMMA), polystyrene, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin) and other styrenic resins, polyether ether ketone (PEEK ), polyetherketone and other polyetherketones, polyethersulfone (PES), polysulfone, polyvinyl chloride (PVC), polyphenylene sulfide (PPS), polyimide (PI), polyamide-imide, Polyetherimide (PEI), polyesterimide, polycarbonate (PC), polyacetal, polyarylene ether (polyphenylene ether, etc.), polyphenylene sulfide, polyarylate, polyaryl , polyurethane, epoxy resin, rubber resin, elastomer, etc. used alone or in combination of two or more.

Among them, as the support (A), a polyester film is preferably used, and polyethylene terephthalate glycol is more preferably used from the viewpoint of small variation in thickness, excellent tensile strength, processability, and economic efficiency (cost). Ester film. Among the above polyester films, it is preferable to use a biaxially stretched polyester film because the strength of the support (A) and the patterned adhesive tape obtained using the support (A) can be further improved.

The support (A) can be produced by molding the resin into a sheet shape. As a method of molding the resin into a sheet shape, a known method such as a melt extrusion method can be used. When the support (A) is a resin film, the resin film may be stretched or non-stretched.

As the support (A), a support composed of a single layer may be used, or a support composed of multiple layers composed of the same or different resins may be used. For example, the support (A) may be a laminated body including a resin film (A1) and a foam sheet (A2). When the support (A) is a laminate having a resin film (A1) and a foam sheet (A2), it is preferable that the resin film (A1) has an adhesive portion on one side and an adhesive portion on the other side. There is a foam sheet (A2) on it.

That is, the adhesive tape of this embodiment may have, for example, a structure in which an adhesive portion (B) is provided on at least one surface (a) of the support (A) of the resin film (A1), or may at least have an adhesive portion (B) as The foam sheet (A2) has a structure in which an adhesive portion (B) is provided on one surface (a) of the support (A). In addition, the adhesive tape of this embodiment may have, for example, a structure in which an adhesive portion (B) is provided on the surface of the resin film (A1) of a laminate having a resin film (A1) and a foam sheet (A2). .

In addition, as the support (A), in order to further improve the adhesion with the adhesive portion (B) or other adhesive layers, one surface or both surfaces of which has been subjected to chromic acid treatment, for example, can be used. , a support for oxidation treatments such as ozone exposure treatment, flame exposure treatment, high-voltage electric shock exposure treatment, ionizing radiation treatment, etc., and a support for forming a primer layer, etc. by using a coating agent, etc.

[Adhesive part (B)]

Next, the adhesive portion (B) constituting the adhesive tape of this embodiment will be described.

As described above, the adhesive portion (B) is provided on one or both sides of the support (A) directly or via another layer.

There is a region (non-adhesive region) between the two or more adhesive portions (B) in which no components constituting the adhesive portion (B) are present or in which no adhesive is exerted. The components constituting the above-mentioned adhesive part (B) are present to a certain extent.

Moreover, the area|region which does not have an adhesive part (B) between the said two or more adhesive parts (B) has a structure which communicates with a part of the edge part (outer edge part) of a patterned adhesive tape. By using the patterned adhesive tape having the above-mentioned structure, when the patterned adhesive tape is attached to an adherend, air bubbles can be easily removed from their interface, so it is possible to prevent problems caused by expansion of the patterned adhesive tape, etc. It has poor appearance and can maintain excellent thermal conductivity, adhesion, etc.

When the adhesive tape of this embodiment is viewed from one surface (a) side of the support (A), the shape of the adhesive portion (B) may be a substantially quadrangular shape, a substantially hexagonal shape, a substantially circular shape, or the like. A substantially circular shape is preferable because air bubbles can be easily discharged from the interface with the adherend (outgassing property) and good adhesive force can be maintained. An example of a substantially circular shape is a shape as shown in FIG. 2 . An example of a substantially hexagonal shape is a shape as shown in FIG. 3 . The adhesive portions of the above shapes are basically independent, but there may be locations where the adhesive portions are partially connected. The shape of the adhesive portion (B) may be an island shape (dot shape) as shown in FIGS. 1 to 3 or a linear shape as shown in FIG. 4 . The linear adhesive portion (B) may extend at an angle intersecting the edge located in the width direction, or may extend at an angle intersecting the edge located in the flow direction, or may extend at an angle intersecting the edge located in the width direction and the edge located in the flow direction. The angular extension of the edge intersection. Among them, the adhesive portion is more preferably dot-shaped (island-shaped), substantially quadrangular, substantially hexagonal, or substantially circular, because flow paths for bubble discharge can be provided in multiple directions.

There is no particular limitation on the substantially circular shape, but it is preferable that the ratio of the maximum diameter to the minimum diameter of one adhesive portion (maximum diameter/minimum diameter) is 1 to 4. More preferably, it is 1-2, Most preferably, it is 1-1.5. An example of a substantially circular shape is a shape as shown in FIG. 2 . The adhesive portions of the above shapes are basically independent, but there may be locations where the adhesive portions are partially connected.

Examples of the substantially quadrangular shape include substantially square, substantially rectangular, substantially trapezoidal, and substantially rhombus shapes. The substantially rhombus shape as shown in FIG. 1 is preferred because air bubbles are easily discharged from the interface with the adherend (outgassing property). , and can maintain good adhesion.

It should be noted that the "roughly" expression of the above-mentioned substantially quadrangular shape, substantially hexagonal shape, etc. includes, for example, when a release liner or the like is affixed to the surface of the adhesive part (B), or when a patterned adhesive tape is wound. When using a roller, by pressing the adhesive portion (B), the corner portions of the quadrilateral and the hexagon are rounded, and the straight portions are changed into curved portions.

It is preferable that the corners of the substantially rectangular shape have a substantially rhombus shape with an angle of 90° or less toward the flow direction of the patterned adhesive tape. The range of 45° to 90° is more preferable because air bubbles are easily discharged from the interface with the adherend (outgassing property) and good adhesive force can be maintained. The above-mentioned rough rhombus with an angle of 90° is a rough square.

In addition, it is preferable that the adhesive portion (b1) and the adhesive portion (b2) constituting the two or more adhesive portions (B) do not face the flow direction and the width direction of the patterned adhesive tape.

In addition, the above-mentioned patterned adhesive tape is often cut into an arbitrary shape according to the purpose and used. At this time, since the adhesive portion (b1) and the adhesive portion (b2) are arranged not to face the flow direction and the width direction, when the pattern-shaped adhesive tape is cut at an arbitrary position, at its end Since the adhesive portion (B) exists in a part of the adhesive tape, peeling off of the patterned adhesive tape can be suppressed.

The adhesive part (b1) of the above-mentioned two or more adhesive parts (B) and other adhesive parts (that exist closest to the above-mentioned adhesive part (b1)) adjacent to the above-mentioned adhesive part (b1) The distance of b2) is preferably 0.5mm or less, more preferably 0.05mm to 0.2mm, and even more preferably 0.06mm to 0.15mm, because bubbles are easily discharged from the interface with the adherend (air-gassing property) and can be maintained It has good adhesion, so it is particularly preferred to be 0.08mm to 0.13mm.

In addition, by setting the distance between the adhesive portion (b1) and the adhesive portion (b2) to be in the above range, the shape of the adhesive portion and the shape of the non-adhesive portion region are less visually recognized, and it is possible to suppress the interference between the adhesive portion and the non-adhesive portion. Appearance defects may occur due to the shape of the non-adhesive area.

The size of each adhesive portion (b1) selected from the above-mentioned adhesive portions (B) is preferably an area of 0.001mm ² to 100mm ² , more preferably an area of 0.01mm ² to 25mm ² , and still more preferably an area of 0.015mm ² to 16mm ² , since Since air bubbles are easily discharged from the interface with the adherend (outgassing property) and good adhesive force can be maintained, 0.02 mm ² to 5 mm ² is particularly preferred.

In addition, by setting the size of each of the adhesive portions (b1) within the above range, the shape of the adhesive portion and the shape of the non-adhesive portion region are less visually recognized, and the shape of the adhesive portion and the non-adhesive portion region can be suppressed. The occurrence of appearance defects due to shape.

It is preferable that the above-mentioned adhesive parts (B) exist within the range of the area of the patterned adhesive tape of the present invention (a square of 5 cm in the flow direction and 5 cm in the width direction), more preferably 150 to 500,000, and still more preferably Preferably, 400 to 100,000 are present, and more preferably, 1,000 to 50,000 are present. This is particularly preferred because air bubbles are easily discharged from the interface with the adherend (outgassing property) and good adhesive force can be maintained. 5,000 to 40,000.

In addition, by setting the number of the adhesive portions (B) within the above range, the shape of the adhesive portion and the shape of the non-adhesive portion region are less visually recognized, and the shape of the adhesive portion and the non-adhesive portion region can be suppressed. causing poor appearance.

In addition, as the above-mentioned patterned adhesive tape, air bubbles can be easily discharged from the interface with the adherend during application (outgassing property), and can maintain good adhesive force even if the adherend such as graphite sheets is further removed. Even when thinning, from the viewpoint of effectively preventing appearance defects caused by the shape of the adhesive portion, it is preferable to use the patterned adhesive tape within a predetermined area (a square of 1 cm in the flow direction and 1 cm in the width direction). An adhesive tape having 120 to 2000 adhesive parts is more preferably used, an adhesive tape having 280 to 1600 adhesive parts is more preferably used, and an adhesive tape having 520 to 1200 adhesive parts is still more preferably used.

It should be noted that the number of the above-mentioned adhesive parts can be determined by observing an arbitrary range of the patterned adhesive tape (a square of 1 cm in the flow direction and 1 cm in the width direction) or (a square of 5 cm in the flow direction and 5 cm in the width direction) of the patterned adhesive tape using an electron microscope. Find it by counting.

The proportion of the area having the adhesive portion (B) to the area of the one surface (a) is preferably 10% to 99%, preferably 20% to 90%, more preferably 30% to 80%, and still more preferably 35%~80%. The above range is particularly preferred because a substantially circular bonding portion described later can be formed. As a result, air bubbles can be easily discharged from the interface with the adherend (outgassing property) and can be efficiently produced. Patterned adhesive tape that maintains good adhesion. In addition, the ratio of the above-mentioned area is the area ratio of the above-mentioned adhesive portion (B) in the area of a square tape of 5 cm in the flow direction and 5 cm in the width direction.

The thickness of the adhesive part (B) is not particularly limited, but is preferably 1 μm to 20 μm, and particularly preferably 2 μm to 15 μm, so that it can have good adhesive force and can easily discharge air bubbles from the interface between the adherend and the adhesive part (B). As a result, 3 μm to 10 μm is more preferable in terms of more effectively preventing poor appearance and deterioration in performance such as thermal conductivity, heat resistance, and adhesive force caused by expansion of the patterned adhesive tape. The thickness of the adhesive part (B) mentioned above refers to the double-sided adhesive measured by using a dial gauge in accordance with JIS K6783, under the conditions that the contact surface of the dial gauge is a flat surface, the diameter is 5mm, and the load is 1.23N. The thickness of the belt.

The said adhesive part (B) can be formed using the adhesive composition for pattern-shaped adhesive tapes of this embodiment mentioned above. Among these, it is preferable to use an adhesive portion obtained using an acrylic adhesive composition as the adhesive portion (B) because it has excellent bonding reliability.

[Method for manufacturing patterned adhesive tape]

The adhesive tape of this embodiment can be formed by, for example, intermittently printing and applying the adhesive composition of this embodiment on at least one surface (a) side of the support (A) and drying it. Use the joint part (B) to make it. Examples of printing coating methods include gravure coating, comma coating, bar coating, die coating, lip roller coating, screen coating, and the like.

When the adhesive composition is intermittently applied to at least one surface (a) of the support (A) by a printing method such as a gravure printing method or a screen printing method, the thickness of the adhesive portion can be easily adjusted to make it uniform. Since it forms an adhesive part, it is preferable.

The patterned adhesive tape can also be produced by intermittently applying the adhesive composition to both sides of the support (A) and drying the adhesive composition.

In addition, the above-mentioned patterned adhesive tape can be formed by intermittently applying the above-mentioned adhesive composition on the surface of the release liner and drying it to form the adhesive part (B), and then the above-mentioned adhesive part (B) can be formed. ) is transferred to at least one surface (a) side of the support (A) and is produced.

Examples of a coating method for intermittently coating the adhesive composition on the support (A) or the release liner include gravure coating, comma coating, bar coating, and die coating. Lip roller coating method, screen coating method, etc. Among them, a method of intermittently applying the adhesive by a gravure printing method (gravure coating method) or screen printing (screen coating method) using a printing plate capable of forming a desired adhesive portion shape is preferred. In the case of composition, it is easy to adjust the thickness of the adhesive part and to form the adhesive part uniformly, so it is preferable.

For example, the patterned adhesive tape of the present invention can be produced using the release liner as described above, and then the release liner can be peeled off as necessary and another release liner can be attached thereto.

The adhesive tape of this embodiment can be suitably used, for example, for bonding a heat dissipation member such as a block or graphite sheet constituting an electronic device such as a portable electronic terminal, and a heat-generating member such as a rechargeable battery. The adhesive tape of this embodiment can be suitably used in manufacturing sites of electronic equipment such as portable electronic terminals. In particular, even when the gap between the adherends (where the patterned adhesive tape is attached) is in a very narrow range of 20 μm or less in width, the adherends can be firmly bonded.

In addition, since air bubbles are easily discharged from the interface between the adherend and the adhesive portion (B), the patterned adhesive tape can be suitably used for fixing heat sinks and magnetic sheets where performance may be reduced due to the remaining air bubbles. fixed use, etc.

(Use for fixed purpose of heat sink)

Electronic devices such as portable electronic terminals are often equipped with components that generate heat due to use. Examples of the heat-generating member include rechargeable batteries, circuit boards, and the like.

In terms of preventing malfunction of the electronic device, it is preferable to avoid local high temperatures in a part of the electronic device due to heat generated by the above-mentioned components. Therefore, heat dissipation members such as heat dissipation fins are often attached to the heat-generating member or members adjacent thereto (for example, metal members serving as frame members for imparting rigidity to electronic devices) for the purpose of diffusing the heat.

As the heat dissipation member, for example, graphite sheets and graphene sheets are preferably used.

Examples of the graphite sheet include artificial graphite sheets and natural graphite sheets.

Examples of the artificial graphite sheet include thermally decomposed graphite sheets obtained by thermally decomposing an organic film such as a polyimide film in a high-temperature inert gas atmosphere.

Examples of the natural graphite sheet include those obtained by subjecting natural graphite to an acid treatment and then pressurizing graphite powder expanded by heating to form a sheet.

As the graphite sheet, it is preferable to use a graphite sheet with few wrinkles in order to exhibit further excellent heat dissipation properties, and it is more preferable to use an artificial graphite sheet with few wrinkles.

The thickness of the graphite sheet is preferably 10 μm to 100 μm, and from the viewpoint of contributing to thinning of electronic devices such as portable electronic terminals, the thickness is preferably 15 μm to 50 μm.

On the other hand, since the graphite sheet is relatively brittle, it is usually used in a state where a graphite composite sheet with a patterned adhesive tape is adhered to one or both sides.

As the graphite composite sheet, for example, as shown in FIG. 5 , it is preferable to use a graphite sheet 4 covered with a single-sided patterned adhesive tape 5 and a double-sided patterned adhesive tape in terms of achieving both high strength and insulating properties of the graphite sheet. 6 sealed graphite composite sheets.

As the graphite composite sheet, when the graphite composite sheet is sealed (packed) with a patterned adhesive tape having a larger area than the graphite sheet, interlayer destruction of the graphite sheet, powder falling, etc. can be prevented and easily It is preferred because it achieves suitable workability.

The patterned adhesive tape of the present invention can be preferably used when bagging the graphite sheet. At this time, the patterned adhesive tape is preferably used with the surface having the adhesive portion (B) facing outward (not toward the graphite sheet side). Accordingly, when the graphite composite sheet is bonded to a heat-generating member such as a rechargeable battery or a member adjacent thereto, it is possible to effectively prevent air bubbles from remaining at the interface between them.

The above-mentioned graphite composite sheet and the above-mentioned member can be bonded, for example, through the following steps: placing the above-mentioned graphite composite sheet on the surface of the above-mentioned member, and a process of temporarily bonding them by lightly pressing them; after the above-mentioned temporary bonding, A process of applying pressure using a roller or the like to firmly bond them. In the above-mentioned temporary bonding process, bubbles usually exist at the interface between the above-mentioned member and the graphite composite sheet. However, when the graphite composite sheet using the patterned adhesive tape of the present invention is pressurized by the roller or the like, the bubbles are quickly discharged from the interface.

In addition, the above-mentioned graphite composite sheets are often attached with a surface protective film in order to prevent damage to the surface. The surface protective film is usually removed after pasting the graphite composite sheet and the member.

The patterned adhesive tape of the present invention can be firmly adhered to an adherend such as a member after the bubbles are discharged. Therefore, when the surface protective film is removed from the graphite composite sheet, the graphite composite sheet is less likely to break. Lifting and peeling from components.

As described above, the graphite composite sheet obtained using the patterned adhesive tape of the present invention can prevent the presence of bubbles at the interface with an adherend such as a member, and therefore can effectively prevent patterned adhesion due to the presence of the bubbles. The increase in the thermal resistance value of the tape can, as a result, increase the thermal conductivity in the thickness direction of the patterned adhesive tape.

(Use of magnetic sheet for fixed purpose)

In order to block the electromagnetic waves emitted from the components constituting the electronic equipment from leaking to the outside and prevent the electromagnetic waves generated from the outside from affecting the electronic equipment, magnetic sheets are often pasted inside the electronic equipment.

As the magnetic sheet, for example, Ni-based ferrite magnetic powder, Mg-based ferrite magnetic powder, Mn-based ferrite magnetic powder, Ba-based ferrite magnetic powder, and Sr-based ferrite magnetic powder can be used. Bulk powder, Fe-Si alloy powder, Fe-Ni alloy powder, Fe-Co alloy powder, Fe-Si-Al alloy powder, Fe-Si-Cr alloy powder, iron powder, Fe-based amorphous, Co-based amorphous, Sheets obtained from Fe-based nanocrystals, etc.

As the above-mentioned magnetic sheet, it is generally preferable to use a thick magnetic sheet in order to provide good electromagnetic wave shielding properties.

The adhesive tape of this embodiment is very thin as described above, and therefore a magnetic sheet having a maximum thickness can be used as the magnetic sheet.

In order to provide good insulation and high strength, the magnetic sheet is preferably used as a magnetic composite sheet in which a patterned adhesive tape is bonded to one or both sides.

Example

Hereinafter, the present invention will be described in more detail by describing examples.

(synthesis example)

"Manufacture of Acrylic Copolymer"

Put 74.9 parts by mass of n-butyl acrylate, 10 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of cyclohexyl acrylate, and 5 parts by mass of acrylic acid into a reaction container equipped with a mixer, a reflux condenser tube, a nitrogen introduction tube, and a thermometer. 0.1 parts by mass of 4-hydroxybutyl acrylate and 100 parts by mass of ethyl acetate were heated to 75°C while blowing nitrogen gas with stirring.

Next, a solution in which 0.1 part by mass of 2,2'-azobis(2-methylbutyronitrile) was dissolved in ethyl acetate was added to the above mixture, and the solution was maintained at 75° C. for 8 hours with stirring.

Next, the above mixture was diluted with ethyl acetate and filtered through a 200-mesh wire mesh to obtain an acrylic acid copolymer solution with a non-volatile content of 40% by mass and a weight average molecular weight of 890,000.

The glass transition temperature of acrylic polymer is -46.5°C.

"Preparation of Adhesive Compositions"

(Preparation Example 1)

With respect to 100 parts by mass of the acrylic copolymer obtained in the above synthesis example, 5 parts of disproportionated rosin glyceryl ester (softening point: 125°C), 15 parts of polymerized rosin pentaerythritol ester (softening point: 125°C), and aromatic-aliphatic hydrocarbons 15 parts of copolymer resin (manufactured by Mitsui Petroleum Chemical Industry Co., Ltd., trade name "FTR6125", softening point: 125°C) was diluted with ethyl acetate to prepare an acrylic adhesive composition with a non-volatile content of 32%. Next, 100 parts by mass of the above-mentioned adhesive composition and 1.0 part of an isocyanate cross-linking agent (manufactured by DIC Co., Ltd., trade name "NC40") were added, and stirred and mixed so as to be uniform, thereby preparing an adhesive composition. (a-1).

Using the above-mentioned adhesive composition (a-1), the elongational viscosity, shear viscosity, and Truton ratio were evaluated by the above-mentioned evaluation method. The results are shown in Table 1.

"Preparation of Adhesive Compositions"

(Preparation Example 2 to Preparation Example 6, Comparative Preparation Example 1 to Comparative Preparation Example 3)

Adhesive compositions (a-1) to (a) were prepared in the same manner as in Preparation Example 1, except that the non-volatile acrylic adhesive compositions shown in Table 1 were diluted with ethyl acetate. -6), (b-1)～(b-3).

Using the above-mentioned adhesive compositions (a-1) to (a-6) and (b-1) to (b-3), the elongational viscosity, shear viscosity, and characteristic properties were evaluated in the same manner as in Preparation Example 1. Luton than. The results are shown in Table 1.

(Example 1)

On "PET25×1J0L" (a release liner manufactured by Nippa Co., Ltd., a PET film with a smooth surface and a polysiloxane-based release treatment surface on the surface), the adhesive obtained in the above preparation example was applied using a roller coater. After removing the agent composition (a-1), it was dried at 100° C. for 1 minute to prepare an adhesive layer with a thickness of 1 μm.

Next, the above-mentioned adhesive layer was transferred to one surface of "K100-2.0W" (manufactured by Mitsubishi Plastics Corporation, polyester film, thickness 2 μm) as a support, thereby obtaining a single-sided adhesive tape.

Next, on the other surface of the support constituting the single-sided adhesive tape, a gravure coater and a gravure plate having a plate shape shown in Table 1 (the recesses of the plate are dot-shaped) were used to gravurely print the above-mentioned The adhesive composition (a-1) was applied in a dot shape and dried at 100° C. for 1 minute, thereby obtaining a patterned adhesive tape with a total thickness of 6 μm, which had a substantially rhombus shape as shown in Figure 1 , an adhesive portion with a thickness of 3 μm having an internal angle θ = 90° (approximately square shape). It should be noted that the distance between any of the above-mentioned adhesive parts and an adjacent adhesive part is 0.1 mm.

In addition, observe with an electron microscope (magnification 100 times), and measure the area of the adhesive portion (each), the distance between the adhesive portion (b1) and the adjacent adhesive portion (b2), and the proportion of the area having the adhesive portion. . These results are shown in Table 2.

On the surface of the patterned adhesive tape obtained above having the adhesive portion, use a laminator to laminate "PET25×1J0L" (manufactured by Nippa Co., Ltd., a PET film with a smooth surface having a polysiloxane system on the surface). (Release liner on the peeled surface)) and apply it with a linear pressure of 3N/mm.

(Example 2 to Example 4, Comparative Example 1 to Comparative Example 2)

The adhesive compositions (a-2) to (a-4) and (b-1) to (b-2) obtained in Preparation Examples 2 to 4 and Comparative Preparation Examples 1 to 2 were used, respectively. , except that the patterned adhesive tapes of Examples 2 to 4 and Comparative Examples 1 to 2 were obtained in the same manner as Example 1. The obtained patterned adhesive tape was evaluated in the same manner as in Example 1, and the results are shown in Table 2. It should be noted that in Comparative Example 2, the adhesive composition transferred from the plate to the support by gravure printing flowed, and the adhesive layer did not become dispersed dots but became solid over the entire surface, and a pattern-like adhesive layer could not be obtained. Together belt.

(Example 5)

In addition to using a screen coater and a screen plate having the plate shape shown in Table 1 (the holes of the plate are dots), the adhesive composition (a-5) obtained in Preparation Example 5 was used, and the adhesive composition (a-5) obtained in Preparation Example 5 was used. The patterned adhesive tape of Example 5 was obtained by the same method as Example 1 except printing and applying it in a dot shape. The obtained patterned adhesive tape was evaluated in the same manner as in Example 1, and the results are shown in Table 2.

(Example 6, Comparative Example 3)

Example 6 and Comparative Example were obtained by the same method as Example 5, except that the adhesive compositions (a-6) and (b-3) obtained in Preparation Example 6 and Comparative Preparation Example 3 were respectively used. 3 patterned adhesive tape. The obtained patterned adhesive tape was evaluated in the same manner as in Example 1, and the results are shown in Table 2. In addition, in Comparative Example 3, before printing the adhesive composition on the support, the adhesive composition flowed out from the plate, screen printing was not possible, and a patterned adhesive tape was not formed.

"Evaluation Methods for Adhesive Compositions"

(non-volatile components)

The nonvolatile content of the adhesive composition was calculated from the nonvolatile content of the acrylic copolymer and the amount of ethyl acetate used for dilution.

(Extensional viscosity, shear viscosity, Truton ratio)

Regarding the adhesive compositions (a-1) to (a-6) and (b-1) to (b-3) of Examples 1 to 6 and Comparative Examples 1 to 3 shown in Table 1 , measure the extensional viscosity when the elongation speed is 4000s ^-1 and the shear viscosity when the shearing speed is 4000s ^-1 by the method shown below, and find the ratio (elongational viscosity/shear viscosity): Trouton than.

The extensional viscosity is measured based on the capillary rheometer evaluation method described in JIS-7199 (ISO 11443, ASTM D 3835).

Specifically, a double capillary type device (manufactured by Gottfert; RHEOGRAPH20) was used. A capillary mold with a length of 30 mm and a diameter of 0.3 mm was used in combination with a capillary mold with a length of 0.25 mm and a diameter of 0.3 mm.

Then, based on the apparent shear viscosity (pressure) measured at a temperature of 30°C and a shear speed of 1000 s ^-1 to 300000 s ^-1 , the pressure loss is removed using bar gray scale correction to obtain the true shear viscosity. From the obtained true shear viscosity and pressure loss, the Cogswell formula is used to calculate the extensional viscosity corresponding to the elongation rate.

The values of the elongational viscosity at an elongation speed of 4000 s ^-1 , the shear viscosity at a shear speed of 4000 s ^-1 and the Truton ratio are shown in Table 1.

＜Preparation of graphite composite sheets＞

A single-sided patterned adhesive tape "IL-05G" (manufactured by DIC Co., Ltd.) of 104 mm long x 104 mm wide x 5 μm thick was bonded to one surface of a graphite sheet of 100 mm long x 100 mm wide x 25 μm thick. The patterned adhesive tape obtained in the example was cut into a size of 104 mm in length x 104 mm in width and pasted on the other surface of the graphite sheet.

At this time, among the adhesive layers constituting the patterned adhesive tape, the adhesive layer having a smooth surface is oriented in contact with the graphite sheet.

Next, a micro-adhesive single-sided adhesive tape "CPF50(25)-SP" (manufactured by Nippa Co., Ltd.) with a thickness of 62 μm was bonded to the surface of the single-sided patterned adhesive tape "IL-05G" to obtain graphite. Composite tablet.

"Evaluation Method for Patterned Adhesive Tapes"

(Measurement of adhesive layer)

Using an electron microscope (magnification: 100 times), the shape, size, etc. of the bonded portion were measured.

Using a dial gauge (manufactured by TESTER Industrial Co., Ltd.), the thicknesses of the adhesive portion, adhesive layer, and adhesive tape were measured.

(Evaluation of adhesive portion shape)

Using an electron microscope (magnification: 100 times), the area of the adhesive portion (each) and the distance between the adhesive portion (b1) and the adjacent adhesive portion (b2) were measured. The ratio of the area having the adhesive portion was calculated from the total area of the adhesive portion.

(Adhesive strength (1 hour after pasting))

The patterned adhesive tape obtained in the Examples and Comparative Examples was cut into a width of 20 mm, and the adhesive layer on one side was lined with a polyethylene terephthalate film having a thickness of 25 μm. as a test piece. The above-mentioned lining is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a component of the present invention.

The above test piece is pasted on the surface of a clean and smooth stainless steel plate, and the upper surface is pressurized by using a 2kg roller to reciprocate once. The test piece is heated at 23°C and 50% RH in accordance with JISZ-0237. After leaving it for 1 hour, the peel adhesive force (peel direction: 180°, tensile speed: 0.3 m/min) was measured using a Tensilon tensile testing machine in an atmosphere of 23° C. and 50% RH. The measurement results are shown in the "Adhesive strength (1 hour after pasting)" column of the table.

(Adhesive strength (24 hours after pasting))

The patterned adhesive tape obtained in the Examples and Comparative Examples was cut into a width of 20 mm, and the adhesive layer on one side was lined with a polyethylene terephthalate film having a thickness of 25 μm. as a test piece. The above-mentioned lining is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a component of the present invention.

The above test piece is pasted on the surface of a clean and smooth stainless steel plate, and the upper surface is pressurized by using a 2kg roller to reciprocate once. The obtained test piece is heated at 23°C and 50% RH in accordance with JISZ-0237. After leaving it under the conditions for 24 hours, the peeling adhesive force (peeling direction: 180°, tensile speed: 0.3m/min) was measured using a Tensilon tensile testing machine in an atmosphere of 23° C. and 50% RH. The measurement results are shown in the "Adhesive strength (24 hours after pasting)" column of the table.

(Retentivity)

The patterned adhesive tape obtained in the Example and Comparative Example was cut into a width of 20 mm, and a product in which the adhesive layer on one side was lined with an aluminum foil having a thickness of 50 μm was used as a test piece. The above-mentioned lining is performed on the surface of the pressure-sensitive adhesive layer having a smooth surface, and is not performed on the pressure-sensitive adhesive layer corresponding to the pressure-sensitive adhesive portion (B) which is a component of the present invention.

The above test piece was pasted on the surface of a clean and smooth stainless steel plate to form a 20 mm × 20 mm pasting area. A 2 kg roller was used to reciprocate once on the upper surface to pressurize it. According to JISZ-0237, it was heated at 23°C and After leaving it for 1 hour under the conditions of 50% RH, a load of 100 g was applied in the shearing direction in an atmosphere of 100° C., and the offset distance of the adhesive tape after 24 hours was measured. The measurement results are shown in the "holding force" column of the table.

[Evaluation method of bubble discharge ease 1 (ease of removal)]

Peel off the release liner of the graphite composite sheet, place an aluminum plate 200mm long x 200mm wide on the surface of the above-mentioned adhesive part in an atmosphere of 23°C and 50% RH, and place it for 5 seconds from above with a load of 10N. A temporary adhesive was thus obtained.

Next, after the temporary adhesive was turned over, a 2-kg roller was used to reciprocate once on the surface of the graphite composite sheet to pressurize them, thereby obtaining a laminate.

Ten pieces of the above-mentioned laminated bodies were produced by the above-mentioned method. By visually observing the bulges of the graphite sheets, it was confirmed whether bubbles were present between the adhesive layer of the graphite composite sheets constituting the laminate and the aluminum plate. Based on the number of laminates in which the presence of bubbles could not be confirmed by the above method, the ease of discharging the bubbles was evaluated.

[Evaluation method of bubble discharge ease 2 (ease of removal)]

Attach "PET25X1J0L" (manufactured by Nippa Co., Ltd., a release liner with a smooth surface after release treatment, Ra = 0.03 μm) to the surface of the adhesive portion formed by peeling off the release liner of the graphite composite sheet, and use a laminator online. After pressurizing at a pressure of 3N/mm, leave it in an environment of 23°C for one day.

Then, the above-mentioned "PET25X1J0L" was peeled off, and in an atmosphere of 23°C and 50% RH, an aluminum plate of 200mm long x 200mm wide was placed on the surface of the adhesive part formed by the peeling, and the load was placed from above the aluminum plate in a state of 10N. 5 seconds to obtain a temporary paste.

Next, after the temporary adhesive was turned over, a 2-kg roller was used to reciprocate once from the surface of the graphite composite sheet to pressurize them, thereby obtaining a laminate.

Ten pieces of the above-mentioned laminated bodies were produced by the above-mentioned method. By visually observing the bulging portion of the graphite sheet, it was confirmed whether there are bubbles between the bonded portion of the graphite composite sheet constituting the laminate and the aluminum plate. Based on the number of laminates in which the presence of bubbles could not be confirmed by the above method, the ease of discharging the bubbles was evaluated.

(Whether the graphite composite sheet floats when peeling off the micro-adhesive film)

A micro-adhesive film (a PET film with a thickness of 75 μm on one side having polysiloxane) was bonded to the surface of the single-sided patterned adhesive tape "IL-05G" (manufactured by DIC Co., Ltd.) constituting the graphite composite sheet. A laminated product of an adhesive tape with a micro-adhesive layer: adhesive force = 0.05N/20mm) is placed on an aluminum plate, and a 2kg roller is used to reciprocate once on the surface to adhere them.

One minute after the above attachment, the micro-adhesive film was peeled off in a direction 180° with respect to the surface of the graphite composite sheet at a speed of 5 m/min, and then it was visually evaluated whether the graphite composite sheet floated from the surface of the aluminum plate. Ten laminated products were produced from each of the graphite composite sheets obtained in the Examples and Comparative Examples, and the above-mentioned test was conducted. The number of laminated products in which it was not possible to confirm whether the graphite composite sheets floated from the surface of the aluminum plate through the above test is described in the following table.

(Appearance evaluation method)

The graphite composite sheet was pasted to an aluminum plate, and the evaluation was based on whether the shape of the bonded portion could be visually recognized when viewed from a position 30 cm away from the upper surface of the graphite composite sheet under a fluorescent lamp. The case where the shape of the adhesive part cannot be visually confirmed at all is evaluated as "◎", the case where the above-mentioned shape can be partially visually confirmed is evaluated as "○", and the case where the above-mentioned shape can be clearly confirmed is evaluated as " ×”. In addition, in Comparative Example 2 and Comparative Example 3, an adhesive part could not be formed and the shape could not be visually recognized by the above method, so they were not evaluated and were marked as "-".

[Number of adhesive parts]

The number of adhesive parts was determined by observing an arbitrary range of the patterned adhesive tape (a square of 5 cm in the flow direction and 5 cm in width) using an electron microscope and counting.

[Table 1]

[Table 2]

"Substantially rhombus (θ = 90°)" in the table refers to a rhombus-shaped adhesive tape with a corner angle of 90° toward the flow direction of the patterned adhesive tape (angle of a corner portion toward the width direction of 90°). joint (Fig. 1). In other words, "substantially rhombus (θ=90°)" in the table refers to a shape (substantially square shape) in which the angle θ of the inner angle is 90° in the shape of the adhesive portion (substantially rhombus shape) shown in FIG. 1 .

(inspection)

An adhesive composition having an extensional viscosity and/or a Trueton ratio within a specified range has good transferability from a printing plate when producing a patterned adhesive tape, and can form an adhesive composition with excellent shape accuracy and shape retention. Joint Department. Therefore, the patterned adhesive tape of the Example is excellent in ease of air bubble discharge and adhesive strength. In addition, the patterned adhesive tape of the embodiment is less likely to float when it is bonded to the graphite composite sheet.

On the other hand, an adhesive composition whose extensional viscosity and/or Truton ratio is not within the prescribed range has poor transferability from the printing plate and the shape of the adhesive portion after transfer when producing a patterned adhesive tape. Poor accuracy and shape retention. Therefore, it is difficult for the adhesive tape of the comparative example to achieve both easy air bubble discharge and adhesiveness.

Specifically, in Comparative Example 1, the adhesive composition had a high elongational viscosity and/or Trouton ratio, so when the adhesive composition was transferred from the plate to the support, it was difficult for the adhesive composition to transfer from the plate to the support. Come out, poor transferability. As a result, the shape of the bonded portion obtained is different from the plate shape (dot shape), the size is also small, and the shape accuracy is reduced. Therefore, in the patterned adhesive tape of Comparative Example 1, the adhesive portion (B) is not substantially rhombus-shaped with respect to the plate shape (dot shape) but has a shape close to a circle, and the adhesive portion becomes smaller due to the shape change due to transfer. The size of the joint (B) also becomes smaller, so the area ratio becomes smaller (the bonding area with the adherend decreases). As a result, the patterned adhesive tape of Comparative Example 1 failed to obtain adhesive force. In addition, in the evaluation of whether the graphite composite sheet floated, the graphite composite sheet using the patterned adhesive tape of Comparative Example 1 easily floated.

In Comparative Example 2, the adhesive composition has a low elongational viscosity and/or Troughton ratio, so when the adhesive composition is transferred from the printing plate to the support, the adhesive composition flows on the support. , unable to maintain the shape of the bonded part. Therefore, in Comparative Example 2, the shape of the adhesive portions (B) could not be maintained, and the spaces between the adhesive portions (B) were filled and became solid (non-adhesive portion areas where no pattern was formed). As a result, the adhesive tape of Comparative Example 2 had no air bubble discharge passage, and the ease of air bubble discharge was significantly poor.

In Comparative Example 3, the adhesive composition had low elongational viscosity and/or Troughton ratio, so the adhesive composition could not be maintained on the plate from the time it was placed on the plate to the time it was transferred to the support. The adhesive composition cannot form an adhesive portion on the support.

In Example 6, the size of the adhesive portion (B) is larger than the dot size of the printing plate, and the distance between the adhesive portions (B) is narrowed. Therefore, compared with other Examples, the ease of air bubble discharge is poor.

Symbol Description

1 support

2 Adhesive part

3 patterned adhesive tape

4 graphite sheets

5 single-sided patterned adhesive tape

6 Double-sided patterned adhesive tape.

Claims (9)

1. An adhesive composition for patterned adhesive tapes used to form patterned adhesive tapes, characterized in that: The adhesive composition for patterned adhesive tapes has an elongational viscosity of 1,000 mPa·s or more and 650,000 mPa·s or less when measured at 30°C, The patterned adhesive tape has an adhesive layer, The adhesive layer has two or more adhesive portions (B), and a non-adhesive portion region having no adhesive portion (B) between the two or more adhesive portions (B), The non-adhesive portion region is in a pattern shape that communicates with the outer periphery of the sheet plane. 2. An adhesive composition for patterned adhesive tapes used to form patterned adhesive tapes, characterized in that: The adhesive composition for patterned adhesive tapes has a Truton ratio of 8 or more and 400 or less when measured at 30°C, The patterned adhesive tape has an adhesive layer, The adhesive layer has two or more adhesive portions (B), and a non-adhesive portion region having no adhesive portion (B) between the two or more adhesive portions (B), The non-adhesive portion region is in a pattern shape that communicates with the outer periphery of the sheet plane. 3. A patterned adhesive tape, characterized in that it contains a support (A) and an adhesive layer, The adhesive layer is formed using the adhesive composition for patterned adhesive tape according to claim 1 or 2, The adhesive layer has two or more adhesive portions (B), and a non-adhesive portion region having no adhesive portion (B) between the two or more adhesive portions (B), The non-adhesive portion region is in a pattern shape that communicates with the outer periphery of the sheet plane. 4. The patterned adhesive tape according to claim 3, wherein the adhesive portion (B) when viewed from one surface (a) side of the support (A) ) is generally circular, generally quadrilateral or generally hexagonal. 5. The patterned adhesive tape according to claim 3 or 4, wherein any adhesive portion (b1) selected from the two or more adhesive portions (B) and an adjacent adhesive portion (b1) are The distance between the adhesive portion (b2) of b1) is 0.5 mm or less. 6. The patterned adhesive tape according to claim 3 or 4, wherein the area having the adhesive portion (B) occupies 10% of the area of one surface (a) of the support (A). The ratio is 10% to 99%. 7. The patterned adhesive tape according to claim 3 or 4, wherein a smooth stainless steel plate is placed on the surface having the adhesive portion (B) and pressed back and forth using a 2kg roller once. , and left it for 1 hour under the conditions of 23°C and 50% RH to obtain a test piece. The 180° peeling adhesive force measured using this test piece was in the range of 1N/20mm to 12N/20mm. 8. A method of manufacturing a patterned adhesive tape, characterized in that: The manufacturing method includes an adhesive layer forming step of forming an adhesive layer on the surface of the support (A) using the adhesive composition for patterned adhesive tapes according to claim 1 or 2, The adhesive layer has two or more adhesive portions (B), and a non-adhesive portion region having no adhesive portion (B) between the two or more adhesive portions (B). 9. The method for manufacturing a patterned adhesive tape according to claim 8, wherein in the adhesive layer forming step, at least one part of the support (A) is formed by a gravure printing method or a screen printing method. The adhesive composition for the patterned adhesive tape is applied to one surface to form two or more substantially circular, substantially quadrangular, or substantially hexagonal adhesive portions (B).