JP2005344068A - Electroconductive adhesive tape and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an electroconductive adhesive tape that has high conductive performance, adhesive strength and a function as a spacer, surely takes earth countermeasure and EMI (Electro Magnetic Interference) countermeasure of personal computer cabinet and various electrical appliances and to provide a method for producing the same. <P>SOLUTION: The electroconductive adhesive tape comprises a double sided adhesive tape 11 provided with adhesive layers 2 and 2 on both sides of a substrate 1 and one or more electroconductive members 3 integrally formed on both sides of the double sided adhesive tape 11. An adhesion part 4 having the exposed adhesive layer 2 is formed on one side or both the sides of the double sided adhesive tape 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a conductive pressure-sensitive adhesive tape and a method for manufacturing the same, and more particularly to a conductive pressure-sensitive adhesive tape for the purpose of grounding and EMI countermeasures for personal computer housings and housings of various electrical products.

  Conventionally, conductive adhesive tape has been used for grounding measures and EMI (Electro Magnetic Interference) measures for personal computer housings and housings of various electrical products. As this conductive adhesive tape, an adhesive layer in which conductive particles such as metal powder or carbon black powder are dispersed is provided on at least one surface of a metal foil such as an aluminum foil or copper foil (for example, a patent Document 1) and a tape-like conductive porous body impregnated with a conductive adhesive containing conductive particles (for example, see Patent Document 2) are known.

Japanese Patent Laid-Open No. 11-80682 JP-A-6-41515

However, the conductive pressure-sensitive adhesive tape described in Patent Document 1 is intended to obtain both adhesive force and conductivity by an adhesive layer in which conductive particles are dispersed in an adhesive having low conductivity. Since the metal foil is attached via the adhesive layer, the conductivity is lower than when the metal foil is directly connected. On the other hand, since the adhesive layer contains conductive particles, there is a problem that the adhesive strength of the adhesive is also reduced. Furthermore, since this conductive adhesive tape is composed of a metal foil and an adhesive layer, in order to prevent the tape itself from thinning and serving as a spacer, for example, a gap is formed between the housing and lid of an electrical product. There has been a problem that it is difficult to use in a portion having a gap.
Further, the conductive adhesive tape described in Patent Document 2 functions as a spacer because the conductive porous body is impregnated with a conductive adhesive, but the conductive adhesive tape described in Patent Document 1 Similarly, the problem of reduced conductivity and adhesion remains.

  Accordingly, the present invention provides a conductive adhesive tape that has high conductivity performance and adhesive force, has a function as a spacer, and can reliably carry out grounding and EMI countermeasures for personal computer housings and housings of various electrical products. And a manufacturing method thereof.

  In order to solve the above problems, the present invention provides a double-sided pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer is formed on both sides of a base material, and one or more conductive members integrally provided on both sides of the double-sided pressure-sensitive adhesive tape. The conductive adhesive tape which provided the adhesion part which the adhesive layer exposed on the one or both surfaces of the double-sided adhesive tape is provided.

  Moreover, this invention provides the electroconductive adhesive tape of Claim 1 which provided the buffer material in a part of said adhesion part.

  Moreover, this invention provides the electroconductive adhesive tape of Claim 1 or 2 in which the said double-sided adhesive tape forms the adhesive layer by impregnating the acrylic adhesive to the base material of acrylic foam. It is.

  Moreover, this invention provides the electroconductive adhesive tape in any one of Claims 1 thru | or 3 in which the said electroconductive member consists of electroconductive metal foils, such as aluminum foil and copper stay.

  The present invention also provides the conductive pressure-sensitive adhesive tape according to claim 4, wherein the conductive metal foil is bent at an end portion of the double-sided pressure-sensitive adhesive tape and integrally provided on both sides of the double-sided pressure-sensitive adhesive tape.

  Moreover, this invention provides the electroconductive adhesive tape of Claim 4 in which a part of electroconductive metal foil provided in the single side | surface of the said double-sided adhesive tape penetrates this double-sided adhesive tape.

  The present invention also includes a conductive metal foil such as an aluminum foil and copper foil, a conductive pressure-sensitive adhesive layer provided on one side of the conductive metal foil, and a cushioning material provided on a part of the conductive pressure-sensitive adhesive layer. The electroconductive adhesive tape which consists of these is provided.

  The present invention also includes a conductive metal foil such as an aluminum foil or copper foil, a conductive adhesive layer provided on one side of the conductive metal foil, and a double-sided adhesive provided on a part of the conductive adhesive layer. The present invention provides a conductive adhesive tape comprising a tape.

  The present invention also includes an attaching step of attaching a belt-like double-sided adhesive tape to the central portion of the belt-like conductive metal foil, and passing the conductive metal foil pasted with the double-sided adhesive tape through the jig in the longitudinal direction through the jig. Bending step of bending both sides of the conductive metal foil to the double-sided adhesive tape side, and pressing step of pressing the conductive metal foil that has passed through the bending jig to press the both sides of the conductive metal foil to the double-sided adhesive tape. The manufacturing method of an electroconductive adhesive tape is provided.

  Further, according to the present invention, the bending jig has a bowl shape, the insertion portion of the conductive metal foil is formed wide, and both side surfaces are curved inward as the direction of travel of the conductive metal foil proceeds. The manufacturing method of the electroconductive adhesive tape of Claim 9 currently formed narrowly is provided.

  Moreover, this invention provides the manufacturing method of the electroconductive adhesive tape of Claim 9 or 10 which made the said crimping | compression-bonding press-press the electroconductive metal foil and a double-sided adhesive tape with a roller machine. is there.

  According to the conductive pressure-sensitive adhesive tape of the present invention, a double-sided pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer is formed on both surfaces of a base material, and one or more conductive members provided integrally on both surfaces of the double-sided pressure-sensitive adhesive tape And having a structure in which an adhesive layer with an adhesive layer exposed is provided on one or both sides of a double-sided pressure-sensitive adhesive tape, the front and back surfaces of the double-sided pressure-sensitive adhesive tape are directly connected to each other by a conductive member. While being able to prevent the decrease, the adhesive portion can also prevent a decrease in the adhesive strength of the pressure-sensitive adhesive because the pressure-sensitive adhesive layer is exposed. In addition, the conductive pressure-sensitive adhesive tape can serve as a spacer by having a base material, and further has an effect that both surfaces can be bonded by providing an adhesive portion on both surfaces of the tape.

  Moreover, this invention can add a buffer function to a conductive adhesive tape by having the structure of Claim 1 which provided the buffer material in a part of said adhesion part, for example, the housing | casing of an electric product There is an effect that it is possible to surely take measures against grounding or EMI at a place where a buffer space is required to open and close the lid, such as between the lid and the lid.

  Further, the present invention provides the double-sided pressure-sensitive adhesive tape, wherein the acrylic foam base material is impregnated with an acrylic pressure-sensitive adhesive to form a pressure-sensitive adhesive layer. There exists an effect which can improve the aging resistance and weather resistance of an adhesive tape.

  In addition, according to the present invention, the conductive member is made of a conductive metal foil such as an aluminum foil and a copper stay, so that a high conductive performance can be obtained by having the configuration according to any one of claims 1 to 3. There is an effect that the conductive member can be easily processed.

Moreover, this invention bent the said electroconductive metal foil at the edge part of a double-sided adhesive tape, and has the structure of Claim 4 provided integrally on both surfaces of this double-sided adhesive tape, By having the structure of Claim 4, There is an effect that the conductive metal foil can be integrally provided on both sides of the double-sided pressure-sensitive adhesive tape by a simple process of bending at the end of the double-sided pressure-sensitive adhesive tape.
Moreover, this invention has a structure of Claim 4 in which a part of electroconductive metal foil provided in the single side | surface of the said double-sided adhesive tape penetrates this double-sided adhesive tape, and makes conductive metal foil double-sided. The conductive metal foil can be integrally provided on both sides of the double-sided pressure-sensitive adhesive tape by providing the pressure-sensitive adhesive tape so as to penetrate.

The present invention also includes a conductive metal foil such as an aluminum foil and copper foil, a conductive pressure-sensitive adhesive layer provided on one side of the conductive metal foil, and a cushioning material provided on a part of the conductive pressure-sensitive adhesive layer. Thus, the spacer function and the buffer function can be added to the conductive adhesive tape by the buffer material.
The present invention also includes a conductive metal foil such as an aluminum foil or copper foil, a conductive adhesive layer provided on one side of the conductive metal foil, and a double-sided adhesive provided on a part of the conductive adhesive layer. By having the structure which consists of a tape, while being able to add a spacer function with a double-sided adhesive tape, there exists an effect which can improve adhesiveness.

  Moreover, according to the manufacturing method of the electroconductive adhesive tape which concerns on this invention, the affixing process which affixes a strip | belt-shaped double-sided adhesive tape to the center part of a strip | belt-shaped electroconductive metal foil, and the conductive metal foil which affixed the double-sided adhesive tape Bending the both sides of the conductive metal foil to the double-sided adhesive tape side by passing the bending metal through the bending jig, and pressurizing the conductive metal foil that has passed through the bending jig to By having a structure consisting of a pressure bonding step for pressure bonding to a double-sided pressure-sensitive adhesive tape, a conductive metal foil can be integrally provided on both sides of the double-sided pressure-sensitive adhesive tape by a simple process, and the front and back surfaces of the double-sided pressure-sensitive adhesive tape are conductive. Since it is directly connected by the metal foil, it is possible to prevent a decrease in conductivity, and the exposed part of the double-sided adhesive tape that is not covered by the conductive metal foil functions as an adhesive part, and also prevents a decrease in adhesive force. There is an effect that can be.

  Further, according to the present invention, the bending jig has a bowl shape, the insertion portion of the conductive metal foil is formed wide, and both side surfaces are curved inward as the direction of travel of the conductive metal foil proceeds. By having the structure of Claim 9 formed narrowly, when conductive metal foil passes the inside of a bending jig, both sides of a conductive metal foil gradually go along the both sides of a bending jig. Since it is bent, the conductive metal foil can be prevented from being broken or wrinkled.

  Moreover, this invention has the structure of Claim 9 or 10 in which the said crimping | compression-bonding process pressure-pressure-bonded the electroconductive metal foil and the double-sided adhesive tape with a roller machine, and both sides of electroconductive metal foil. There is an effect that the conductive metal foil can be prevented from becoming wrinkles when the part is pressed against the double-sided adhesive tape.

Embodiments of the present invention will be described based on examples shown in the drawings.
The conductive pressure-sensitive adhesive tape 10 according to the present invention includes a double-sided pressure-sensitive adhesive tape 11 in which pressure-sensitive adhesive layers 2 and 2 are formed on both sides of a base material 1 and one or two integrally provided on both sides of the double-sided pressure-sensitive adhesive tape 11. The adhesive part 4 which consists of the above electroconductive member 3 and to which the adhesive layer 2 was exposed on the one or both surfaces of the double-sided adhesive tape 11 is provided.

  In the embodiment shown in FIG. 1, the base material 1 is made of acrylic foam, and the pressure-sensitive adhesive layer 2 is formed by impregnating both sides of the base material 1 with an acrylic pressure-sensitive adhesive. Since the base material 1 functions as a spacer, a substrate having a thickness of 0.3 to 3.0 mm is used in the illustrated embodiment. In addition, it is preferable to use acrylic foam as the base material 1 because it has a strong bonding strength and is excellent in flexibility, weather resistance, durability, etc., but a base material such as a nonwoven fabric base material or a film base material. Can also be used. The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive because of excellent weather resistance, durability, etc., but it is also possible to use a pressure-sensitive adhesive such as polyvinyl ether or polyvinyl acetate. Is possible.

  The conductive member 3 is made of a conductive metal foil such as an aluminum foil or copper stay. The thickness of the conductive metal foil is 10 to 200 μm, preferably 20 to 50 μm. In addition, the conductive metal foil is provided by being bonded to one surface of the double-sided pressure-sensitive adhesive tape 11, and both sides of the conductive metal foil are bent and bonded to the other surface at the end of the double-sided pressure-sensitive adhesive tape 11. Yes, the conductive member 3 is integrally provided on both sides of the double-sided pressure-sensitive adhesive tape 11. The conductive member 3 is preferably made of a conductive metal foil because it is easy to process and has high conductive performance. However, a metal piece such as aluminum or copper, a conductive polymer, a sheet coated with copper or silver, etc. Can also be used.

Further, the double-sided pressure-sensitive adhesive tape 11 is provided with an adhesive portion 4 where the adhesive layer 2 is exposed on the side where the conductive metal foil is bent, and a release paper 5 is provided on the adhesive portion 4.
When this conductive adhesive tape 10 is used, if the release paper 5 is peeled off from the adhesive portion 4 and is attached to a housing of a personal computer or various electric products, for example, the conductive member 3 comes into contact with the housing and double-sided adhesive Grounding and EMI countermeasures can be reliably performed through the conductive members 3 provided integrally on both surfaces of the tape 11.

Next, the manufacturing method of the electroconductive adhesive tape shown in Example 1 is demonstrated based on FIG.
The manufacturing method of the electroconductive adhesive tape which concerns on this invention is the conductive metal foil 12 which affixed the strip | belt-shaped double-sided adhesive tape 11 on the center part of the strip | belt-shaped electroconductive metal foil 12, and the double-sided adhesive tape 11 affixed. Through the bending jig 13 in the longitudinal direction, bending the both sides of the conductive metal foil 12 to the double-sided adhesive tape 11 side, and pressurizing the conductive metal foil 12 that has passed through the bending jig 13 to conduct the conductive metal. It comprises a crimping step of crimping both side portions of the foil 12 to the double-sided adhesive tape 11.

In the embodiment shown in FIG. 2, the bending jig 13 has a bowl shape, the insertion portion 13 a of the conductive metal foil 12 is formed wide, and both side surfaces are inward as it goes in the traveling direction of the conductive metal foil. The discharge portion 13b of the conductive metal foil 12 is bent and formed narrow.
Further, a roller machine 14 is provided on the discharge part side of the bending jig 13 so that the conductive metal foil 12 and the double-sided adhesive tape 11 discharged from the bending jig 13 can be pressure-bonded.

  First, a ruled line corresponding to the width of the double-sided pressure-sensitive adhesive tape 11 is drawn on the strip-shaped conductive metal foil 12, and the double-sided pressure-sensitive adhesive tape 11 is attached to the conductive metal foil 12 according to this ruled line (sticking step). Next, when the conductive metal foil 12 with the double-sided pressure-sensitive adhesive tape 11 is inserted into the bending jig 13, both side portions of the conductive metal foil 12 gradually move toward the double-sided pressure-sensitive adhesive tape 11 along the side surfaces of the bending jig 13. And bent so as to sandwich both side portions of the double-sided pressure-sensitive adhesive tape 11 (bending step). The conductive metal foil 12 and the double-sided adhesive tape 11 discharged from the bending jig 13 are pressure-bonded by a roller machine 14 (crimping step), and the conductive adhesive tape 10 shown in FIG. 1 is manufactured.

Next, another embodiment of the conductive adhesive tape according to the present invention will be described with a focus on differences from the first embodiment.
In the embodiment shown in FIG. 3, the conductive pressure-sensitive adhesive tape 10 is a double-sided pressure-sensitive adhesive tape provided with adhesive portions 4 and 4 where the pressure-sensitive adhesive layer 2 is exposed on both surfaces of the double-sided pressure-sensitive adhesive tape 11. At both ends of the double-sided pressure-sensitive adhesive tape 11, conductive members 3 and 3 made of a pair of conductive metal foils formed in a U-shaped cross section are integrally provided on both sides of the double-sided pressure-sensitive adhesive tape 11. The pressure-sensitive adhesive layer 2 at the center of both surfaces 11 is exposed. Further, the double-sided pressure-sensitive adhesive tape is not limited to the embodiment shown in FIG. 3, and in the embodiment shown in FIG. 1, the adhesive member 2 is exposed on both sides of the double-sided pressure-sensitive adhesive tape 11 by providing holes in the conductive member 3. It is also possible to form the parts 4 and 4.

  In the embodiment shown in FIG. 4 or FIG. 5, the conductive adhesive tape 10 is provided with a cushioning function 6 by providing a cushioning material 6 such as urethane foam or foam rubber on a part of the adhesive portion 4, for example, an electric product. Thus, it is possible to reliably take measures against grounding and EMI at a place where a buffer space is required to open and close the lid, such as between the case and the lid.

  In the embodiment shown in FIG. 6, the conductive pressure-sensitive adhesive tape 10 has a hole formed in the conductive member 3 made of a conductive metal foil provided on one surface of the double-sided pressure-sensitive adhesive tape 11, and a part of the conductive member 3. Is configured to pass through the double-sided pressure-sensitive adhesive tape 11 and be exposed on the other surface of the double-sided pressure-sensitive adhesive tape 11.

In the embodiment shown in FIG. 7, the conductive pressure-sensitive adhesive tape 10 includes a conductive member 3 made of a conductive metal foil such as aluminum foil or copper foil, and a conductive pressure-sensitive adhesive layer 7 provided on one side of the conductive member 3. And a buffer material 6 provided on a part of the conductive pressure-sensitive adhesive layer 7. The conductive pressure-sensitive adhesive layer 7 is made of an acrylic pressure-sensitive adhesive containing conductive particles such as metal powder and carbon black powder.
The conductive pressure-sensitive adhesive layer 7 can be provided with a double-sided pressure-sensitive adhesive tape in place of the buffer material 6, and of course, a configuration in which a pressure-sensitive adhesive layer is provided on both surfaces of the buffer material 6 is also possible.

The partial longitudinal section perspective view which shows one Example of this invention electroconductive adhesive tape. The perspective view which shows the manufacturing method of the Example. The partially vertical perspective view which shows another Example. The partially vertical perspective view which shows other Examples. The partially vertical perspective view which shows other Examples. The partially vertical perspective view which shows other Examples. The partially vertical perspective view which shows other Examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Adhesive layer 3 Conductive member 4 Adhesion part 5 Release paper 6 Buffer material 7 Conductive adhesive layer 10 Conductive adhesive tape 11 Double-sided adhesive tape 12 Conductive metal foil 13 Bending jig 13a Insertion part 13b Discharge part 14 Roller machine 15 Ruled line

Claims (11)

  It consists of a double-sided pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer is formed on both sides of the base material, and one or more conductive members integrally provided on both sides of the double-sided pressure-sensitive adhesive tape. A conductive pressure-sensitive adhesive tape provided with an adhesive portion where the pressure-sensitive adhesive layer is exposed.   The conductive adhesive tape according to claim 1, wherein a buffer material is provided on a part of the adhesive portion.   The electroconductive pressure-sensitive adhesive tape according to claim 1 or 2, wherein the double-sided pressure-sensitive adhesive tape is formed by impregnating a base material of an acrylic foam with an acrylic pressure-sensitive adhesive to form a pressure-sensitive adhesive layer.   4. The conductive adhesive tape according to claim 1, wherein the conductive member is made of a conductive metal foil such as an aluminum foil or a copper foil.   The conductive adhesive tape according to claim 4, wherein the conductive metal foil is bent at an end portion of the double-sided pressure-sensitive adhesive tape and integrally provided on both sides of the double-sided pressure-sensitive adhesive tape.   The conductive adhesive tape according to claim 4, wherein a part of the conductive metal foil provided on one side of the double-sided adhesive tape penetrates the double-sided adhesive tape.   An electrically conductive adhesive comprising an electrically conductive metal foil such as an aluminum foil or copper foil, an electrically conductive adhesive layer provided on one side of the electrically conductive metal foil, and a buffer provided on a part of the electrically conductive adhesive layer tape.   Conductivity comprising a conductive metal foil such as an aluminum foil or copper foil, a conductive pressure-sensitive adhesive layer provided on one side of the conductive metal foil, and a double-sided pressure-sensitive adhesive tape provided on a part of the conductive pressure-sensitive adhesive layer Adhesive tape.   A pasting step of pasting a strip-shaped double-sided adhesive tape to the center of the strip-shaped conductive metal foil, and bending the conductive metal foil pasted with the double-sided adhesive tape in the longitudinal direction through a jig to both sides of the conductive metal foil Manufacturing of a conductive pressure-sensitive adhesive tape comprising a bending step of bending the double-sided pressure-sensitive adhesive tape to the double-sided pressure-sensitive adhesive tape and a pressure-bonding step of pressurizing the conductive metal foil that has passed through the bending jig to press both sides of the conductive metal foil to the double-sided pressure-sensitive adhesive tape. Method.   The bending jig has a bowl shape, the insertion portion of the conductive metal foil is formed wide, and both side surfaces are curved inward as the direction of travel of the conductive metal foil proceeds to be narrow. The manufacturing method of the electroconductive adhesive tape of Claim 9. The manufacturing method of the electroconductive adhesive tape of Claim 9 or 10 which made the said crimping | compression-bonding press-press the electroconductive metal foil and a double-sided adhesive tape with a roller machine.

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