JP2001311063A - Conductive adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive adhesive tape improved in oxidation- preventing performance and flexibility and reduced in production cost. SOLUTION: This invention relates to a conductive adhesive tape comprising a web of polyester film having a first surface and a second surface, a conductive metal film which is directly coated on the second surface of the polyester film and a layer of conductive adhesive which is applied onto the conductive metal film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive adhesive tape, in particular, a conductive metal film formed of a polyester film,
For example, formed by vapor deposition on a poly (ethylene terephthalate) (PET) web support, and then coating a layer of conductive adhesive on the conductive metal film to improve antioxidant performance and flexibility; The present invention relates to a conductive adhesive tape with reduced manufacturing cost.

[0002]

2. Description of the Related Art "Foil tap"
e) "is a type of adhesive tape that includes a metal foil used to bond between two or more conductors for electrical connection, such as a computer monitor, TV screen, car phone, or electromagnetic interference (EMI). Shielding and electrostatic dissipation (s
TC for static disposition
O-99 (or 95, 92) and / or MPR
It has been widely used in devices that need to meet II. For example, in the foil tape application shown in FIG. 1 or 2, the foil tapes T each have a predetermined length and are adhered to a metal frame around a cathode ray tube (CRT) S, so that the electrostatic charge of the CRT is reduced. Dissipated by the tape T to establish EMI shielding on the CRT.

[0003] Usually, conventional foil tapes are made of ductile metal,
A metal foil 11 made of, for example, aluminum or copper and having a thickness D ₁ of about 50 μm and a layer 12 of a conductive or non-conductive adhesive having a thickness D ₂ of about 30 μm applied flat on said metal foil 11 , And substantially the structure shown in FIG. Due to such a structure and the manufacturing method of the above-mentioned conventional foil tape 1, a prefabricated metal foil (for example, aluminum Or copper foil) must be prepared in advance. This reduces the conductivity of the foil tape. Otherwise, in order to prevent the metal foil from being oxidized, it is necessary to perform an antioxidation treatment on the metal foil. In order to maintain the desired tensile strength, conventional foil tapes are made thicker (typically 50 μm or more), so that the metal foil 11 is undamaged or tough. That adversely affects the ability to bend with the outer shape of the object to which the foil tape is applied. Conventional foil tape 1
Requires a thicker metal foil 11, the above metal foil 1
The handling, transport and storage of 1 are complicated and costly, and the production cost of the foil tape is high.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first object of the present invention is to reduce the thickness of the metal film and the total tape thickness to prevent the metal film from being oxidized. An object of the present invention is to provide a conductive adhesive tape that suppresses the pressure, improves the flexibility of the tape, and reduces the manufacturing cost.

[0005]

In particular, the conductive adhesive tape of the present invention comprises a polyester film web, a conductive metal film formed by depositing a conductive metal on a polyester film web, and the above-mentioned metal. A conductive adhesive applied flat on the film; whereby the web of polyester film provides sufficient tensile strength required for the tape, and the thickness of the metal film and the thickness of the tape The overall thickness is significantly reduced and the flexibility of the tape is improved. Since the metal film is sandwiched between the polyester film web and the conductive adhesive, the metal film is isolated from the outside air, and the antioxidant property and the conductivity of the tape are improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIG. 4, one of the preferred embodiments of the conductive adhesive tape 2 of the present invention is mainly a web 21 of a polyester film, a conductive metal film 2 or the like.
It includes 2 and the conductive adhesive 23, the above-mentioned polyester film 21 having first and second surfaces, may be a web material made of polyethylene terephthalate (phthalates) having a thickness D ₃ of 25 [mu] m. The conductive metal film 22
(For example, a copper or aluminum film) is formed by evaporating or sputtering a metal material on the second surface of the polyester film 21, and is formed by about 15 minutes.
It has a thickness _{D 4} of the [mu] m. The conductive adhesive 23 may be any conventional conductive adhesive. The adhesive is applied on the conductive metal film 22 having a thickness D ₅ of 30 [mu] m.

The above-mentioned polyester film web 21
(For example, a PET web) has good flexibility and tensile strength, so that it is possible to provide the conductive adhesive tape 2 of the present invention having a strength necessary for maintaining the tape structure. Also, since the conductive metal film 22 is directly coated on the second surface of the polyester film 21 by vapor deposition, when the conductive metal film 22 is coated on the polyester film 21, only one surface is exposed to air. You. The conductive adhesive 23 is applied on the conductive metal film 22 as soon as the conductive metal film 22 is formed by vapor deposition, and the conductive metal film 22 is
1 and the conductive adhesive 23 to isolate the conductive metal film 22 from the air. Therefore, oxidation of the conductive metal film 22 is greatly reduced. In use, the surface of the conductive adhesive 23 may be directly coated between electrically connected objects. Since the polyester film 21 covers the conductive metal film 22,
When the conductive adhesive 23 is applied, the conductive metal film 22 can be protected from surface oxidation or corrosion.

Since the polyester film 21 has good flexibility and tensile strength, the thickness of the conductive metal film 22 can be greatly reduced without lowering the strength necessary for the tape. . By reducing the thickness of the conductive metal film 22, the flexibility of the conductive adhesive tape 2 is improved, and the tape can be removed without causing end peeling (flagging) at the corners of the tape 2. The ability to adapt to the contour of the surface of the object to which it is applied is greatly improved.

The above polyester web material (eg, PE
T-webs) are much cheaper than metal foils, and consequently the starting material and production costs can be reduced by the present invention. Further, during manufacture, the conductive adhesive is applied on the conductive metal film as soon as the conductive metal film is formed on the polyester web material by vapor deposition. No antioxidant treatment is required, eliminating the need for handling and storage of the metal foil, reducing manufacturing costs.

A comparison between the conductive adhesive tape of the preferred embodiment of the present invention and the current foil tape is shown in the following table.

[0011]

[Table 1]

[0012]

In conclusion, it is apparent that the present invention provides an improved conductive adhesive tape and reduces its total thickness and the thickness of the conductive metal film, and the antioxidant properties and conductivity of the metal film. Improve the flexibility of the adhesive tape,
And reduce manufacturing costs.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state of four separation foil tapes respectively applied to the outer periphery of a computer monitor or a TV screen.

FIG. 2 is a schematic diagram showing an elongated strip of four foil tapes applied to the outer periphery of a computer monitor or TV screen.

FIG. 3 is a schematic view showing the structure of a conventional foil tape.

FIG. 4 is a schematic sectional view showing the structure of a conductive adhesive tape according to one preferred embodiment of the present invention.

[Explanation of symbols]

1 ... conventional foil tape 11 ... metal foil 12 ... conductive adhesive 2 ... conductive adhesive tape 21 ... Web 22 ... conductive metal film coating 23 ... conductive adhesive D ₁ ... conventional foil of the polyester film of the present invention the thickness D ₂ ... thickness D ₃ ... thickness thickness D ₅ ... conductive adhesive web thickness D ₄ ... metal film of a polyester film of a conventional foil tape conductive adhesive tape of the metal foil S: Screen T: Conductive adhesive tape foil tape

Claims (4)

[Claims] 1. A web of a polyester film having a first surface and a second surface; a conductive metal film directly coated on a second surface of the polyester film; and a conductive adhesive applied on the conductive metal film. Conductive adhesive tape containing a layer of agent. 2. The method according to claim 1, wherein the polyester film has a thickness of 25.
2. The conductive adhesive tape according to claim 1, comprising a poly (ethylene terephthalate) web material having a micrometer. 3. The conductive adhesive tape according to claim 1, wherein the conductive metal film is formed by aluminum deposition on the second surface of the polyester film and has a thickness of 15 μm. 4. A web of poly (ethylene terephthalate) film having a first surface and a second surface and having a thickness of 25 μm; aluminum deposited directly on the second surface of the polyester film and having a thickness of 15 μm The conductive adhesive tape according to claim 1, comprising: a metal film; and a layer of a conductive adhesive applied on the conductive metal film and having a thickness of 30 µm.