JPH05101712A - Tape cable - Google Patents

Abstract

PURPOSE:To enhance heat resistance and flame resistance and further improve terminal processing property and applicability to a movable part in a tape cable. CONSTITUTION:This cable comprises; a binary or ternary copolymer film layer 1, composed of polyolefine including or not-including a flame retardant and glycidyl methacrylate, and laminated directly with a polyester resin film 2; or the binary or ternary copolymer film layer 1 of the polyolefine and glycidyl mathacrylate in two sheets of laminated films each constituted by interposing a cross-linking type primer layer between the two film layers 1,, as required. Plural pieces of electric conductors 5 are separated at desired intervals and interposedly embedded in these layers, and a free radiation or visible light is radiated thereon to perform cross-linking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape electric wire which is excellent in heat resistance, flame retardancy and terminal treatment property and can be suitably used for a movable part.

[0002]

2. Description of the Related Art Tape electric wires have insulation performance and adhesiveness,
Alternatively, various film layers and the like having excellent heat resistance and flame retardancy are laminated over several layers, and a plurality of electric conductors are embedded in the laminated layers in desired intervals. These tape electric wires are extremely easy to perform wiring work in terms of the above-mentioned shape, and can be installed in a narrow space, which contributes to downsizing of devices, communication devices, word processors, copying machines,
It is widely used for wiring of home appliances, computers, automobiles, etc.

As shown in FIG. 5a, the laminated film 10 conventionally used in these tape electric wires generally has a polyester resin film layer 12 and a thermoplastic or heat-crosslinkable polyester resin composition, a polyolefin or a modified polyolefin. , The adhesive film layer 11 made of any material selected from the group of PVC compositions by various laminating techniques such as dry laminating, wet laminating and extrusion laminating, or if necessary FIG. As described above, a primer layer 13 is further interposed between both film layers 12 and 11 to adhere and laminate them. For the thermoplastic adhesive layer or the heat-crosslinking adhesive layer that cannot be formed into a film, the above-mentioned adhesive film layer 11 is formed by various printing means or coating means. As shown in FIG. 5b, the film layers 12 and 11 may be bonded together via a primer layer 13.

A conventional tape electric wire, as shown in FIG.
The adhesive film layers 11 and 11 of the two laminated films 10 and 10 having such a structure are opposed to each other, and a plurality of electric conductors 14 are sandwiched between them while being separated by a desired distance and heated by a heating roll or the like. Adhesive film layer 1 by pressure bonding
1, the electric conductors 14 were softened and integrated, and the electric conductor 14 was embedded in the adhesive film layer 11 as shown in FIG.

[0005]

However, for example, in the thermoplastic polyester resin composition used for the adhesive film layer 11, a material having a high glass transition temperature is excellent in heat resistance but poor in low temperature resistance, A material having a low transition temperature has excellent low temperature resistance but poor high temperature resistance. Further, the heat-crosslinkable polyester resin composition is expensive,
Moreover, since isocyanate is used as a cross-linking agent, the pot life is short, the storage is difficult, and the production conditions are not stable. Further, since the polyester adhesive has good adhesiveness, the end treatment property of the electric wire is poor, and improvement has been desired.

[0006] Polyolefin as an insulating material has no adhesiveness to the electric conductor 14 and therefore has a good terminal treatment property. An electric wire using this can be used as a fixed wiring, but when used as a movable wiring. However, problems such as floating and peeling of the insulating layer and protrusion of the electric conductor 14 may occur. Furthermore, since modified polyolefins are generally graft-modified with acid anhydrides, their adhesiveness with metal conductors is improved, but when copper conductors are used, green discoloration occurs, and addition of a copper damage inhibitor is added. Will be needed. The same was true for EVA, EEA, ionomers and their modified products. Next, like the polyolefin, the PVC composition has no adhesion to the electric conductor 14 and has a good end treatment property, and an electric wire using this can be used as a fixed wiring,
When it is used as a movable wiring, inconvenience due to floating of the insulating layer, peeling, protrusion of the electric conductor 14 and the like cannot be avoided.

As described above, the conventional tape electric wire has no problem when it is used as a fixed wiring, but when a high degree of heat resistance and flame retardancy is required, and a repeated bending stress is applied. I could not avoid the inconvenience. The object of the present invention is to eliminate such drawbacks of the conventional tape electric wire, have excellent terminal treatment property, have high heat resistance and flame retardancy, do not cause green discoloration, and add a copper damage inhibitor. It is an object of the present invention to provide a tape electric wire that can be used in applications where unnecessary bending stress is applied repeatedly.

[0008]

Means for Solving the Problems The tape electric wire of the present invention which is excellent in flame retardancy and heat resistance and is excellent in repeated bendability is a binary or ternary copolymer film layer of polyolefin and glycidyl methacrylate, and a polyester resin film. Two layers of the laminated film are formed by directly laminating the layers, or by laminating a cross-linking primer layer between the two film layers as necessary, with the copolymer film layers facing each other. The electric conductors are isolated from each other at a desired interval, sandwiched and embedded, and then irradiated with free radiation or visible light to be crosslinked.

A specific embodiment of the present invention will be described with reference to FIGS. First, as shown in FIG. 1a, the laminated film 3 is obtained by directly laminating a binary or ternary copolymer film layer 1 of polyolefin and glycidyl methacrylate containing or not containing a flame retardant, and a polyester resin film layer 2, or As shown in FIG. 1b, the film layers 1 and 2 may be laminated with a crosslinkable primer layer 4 interposed therebetween.

Next, as shown in FIG. 2, using two laminated films 3 obtained as described above, the copolymer film layers 1 of both laminated films are opposed to each other, and a plurality of electric conductors are provided between them. , 5 are separated from each other at desired intervals and heated and pressurized to integrate the copolymer film layer 1 as shown in FIG. 3 to embed the electric conductors 5, 5. Then, free radiation or visible light is emitted to crosslink.

In the present invention, one of the laminated films 3
That is, the reason for using a binary or ternary copolymer of polyolefin such as LD-polyethylene, EVA, polypropylene and glycidyl methacrylate as the layer in which the electric conductor 5 is embedded is that it has excellent low temperature resistance and high temperature resistance. It has excellent adhesiveness to the conductor 5 and the polyester of the other layers, does not have the problem of the conductor peeling off as in the examples described later, and hardly deteriorates the terminal processability. This is because greening due to reaction with the conductor does not occur.

In the present invention, as the additive to be added to the above-mentioned copolymer for imparting flame retardancy, particularly a halogen-based flame retardant or a phosphorus-based flame retardant is added in a small amount to obtain a great effect. Therefore, it is preferable. As these halogen-based flame retardants, there are bromine-based flame retardants such as hexabromobenzene, decabromodiphenyl ether, hexabromodiphenyl ether, pentabromotoluene, pentabromophenol, and chlorine-based flame retardants such as decachlorobiphenyl. A combined use of a flame retardant with an antimony flame retardant described below is also preferable. Examples of the phosphorus-based flame retardant include red phosphorus, those obtained by stabilizing red phosphorus, ammonium polyphosphate, and various phosphate esters.

Besides, antimony type flame retardants such as antimony trioxide and non-halogen type flame retardants such as aluminum hydroxide and magnesium hydroxide can also be used. The amount of the halogen-based or phosphorus-based flame retardant added is preferably 5 to 20 parts by weight based on 100 parts by weight of the binary or ternary copolymer of polyolefin and glycidyl methacrylate. If the addition amount is less than 5 parts by weight, the expected flame retardant effect cannot be obtained, and if the addition amount is 20 parts by weight, the obtained flame retardancy is sufficient, and if the addition amount exceeds 20 parts by weight, However, a large effect cannot be expected, rather the film moldability is lowered, and the adhesiveness is lowered.

The above-mentioned halogen-based or phosphorus-based flame retardants, of course, exhibit a flame-retardant effect even when used alone. Especially, in the case of halogen-based flame retardants, the flame retardancy is significantly improved by the combined use with antimony trioxide. .. The amount of antimony trioxide added is
10 parts by weight or less is suitable for 100 parts by weight of the binary or ternary copolymer of polyolefin and glycidyl methacrylate. The effect is 10 even if added in excess of 10 parts by weight.
This is at the same level as when adding parts by weight, and rather the film formability is lowered, and adverse effects such as reduced adhesiveness occur.
As described above, as a method of adding various flame retardants such as halogen-based or phosphorus-based flame retardants and antimony trioxide to the binary or ternary copolymer of polyolefin and glycidyl methacrylate, various internal mixers, kneaders, and biaxial A known kneading device such as a kneading extruder can be used. At the same time, various additives such as an antioxidant, a copper damage inhibitor, a colorant and a filler can be added.

In the present invention, when laminating the films, various laminating means such as dry laminating, wet laminating and extrusion laminating may be used, or both the film layers 1 and 1 may be laminated as necessary as described above.
The two layers may be bonded to each other via a cross-linking type (eg urethane type primer) primer layer 4 (FIG. 1b).
Further, in the present invention, after embedding the conductor by sandwiching it with a laminated film, the reason for irradiating with free radiation or visible light is that the polyolefin and glycidyl which are the adhesive / glue layers are left without crosslinking treatment of the laminated film. When a layer in which a flame retardant is added to a binary or terpolymer of methacrylate is heated to, for example, about 105 ° C., melting occurs,
Thereby, when the tape electric wire is bent at the temperature, a part of the end portion of the adhesive layer may be peeled off at the bent portion, and the electrical characteristics may be deteriorated. As the free radiation source, a commonly used electron beam or γ-ray can be used.

The irradiation dose of such free radiation is related to the thickness of the laminated film to be irradiated and is not particularly limited, but usually 2 to 30 Mrad is preferable. The reason is that when it is less than 2 Mrad, the effect of irradiation cannot be exhibited, and when it exceeds 30 Mrad, the molecules of the polyester layer and the primer layer are significantly disintegrated, which may deteriorate the film. is there. When a normal non-cross-linking type primer is used instead of the cross-linking type (for example, urethane type primer), even if it is cross-linked by irradiation, when it is bent at a high temperature such as 105 ° C. The end of the adhesive layer may peel off and is not suitable.

[0017]

In the tape electric wire of the invention, the binary or ternary copolymer film layer of polyolefin and glycidyl methacrylate, which is the conductor embedding layer, is directly laminated on the polyester resin film layer, or if necessary, both of them are laminated. A crosslinked primer layer is interposed between the film layers to form a laminated film. Then, the copolymer film layers are made to face each other, and a plurality of electric conductors are sandwiched between the laminated films at desired intervals, sandwiched and embedded, and irradiated with free radiation or visible light to be crosslinked to form a tape. Since it is an electric wire, the adhesion retention at the interfaces between the films or at the interface between these and the electric conductor is surprisingly improved, and the stability is maintained even at high temperatures, and comprehensively stable electrical characteristics are maintained. To show.

[0018]

EXAMPLES The present invention will be described below with reference to specific examples. Examples 1 to 9 In 100 parts by weight of polyethylene, a terpolymer of glycidyl methacrylate and ethylene-vinyl acetate (trade name, Bond First A manufactured by Sumitomo Chemical Co., Ltd.), Table 1
Add an amount of halogen-based or phosphorus-based flame retardant, antimony trioxide, and add 10 minutes at 140 ° C with an intensive mixer.
After kneading for a minute, a film 1 having a thickness of 50 μm was obtained. The film 1 and a polyethylene terephthalate film (hereinafter referred to as PET film) 2 having a thickness of 38 μm were adhered to each other by an extrusion laminating method at 160 ° C. to obtain a laminated film 3. Next, the obtained two laminated films are made to face each other with the adhesive layer 1 facing each other as shown in FIG. 2, and four flat rectangular copper conductors 5 are arranged and sandwiched between them at a desired interval, and they are heated between 150 ° C. hot rolls. It pressure-bonded and the tape electric wire as shown in FIG. 3 was obtained. And 10Mrad on one side of the created tape electric wire
Example 1 by irradiating the opposite surface with an electron beam of 10 Mrad, and irradiating with an electron beam of 20 Mrad in total.
-9 tape electric wires were obtained.

The following evaluation test was conducted on the obtained tape electric wire, and the results are shown in Table 1 below. High temperature (105 ° C) bending heating test: Bend the tape electric wire as shown in Fig. 4, apply a load of 5 kg to the part a and leave it for 24 hours, and then apply a load of 5 kg to the parts b and c to fix it. And 105 ℃
Put in a thermostatic chamber controlled to, and after standing for 24 hours, bend back the bent portion at room temperature to evaluate whether peeling has occurred in the bent portion. Flame retardance evaluation: in accordance with JIS K 6911 and UL I went. Terminal processability: Evaluation by the company's terminal processor. Evaluation as movable wiring: U-shaped wiring was applied to a 400 mm electric wire with a bending diameter of 10 R, one end was fixed, the other end was moved 200 mm, and the number of reciprocations leading to disconnection of the conductor was obtained. It was

[0020]

[Table 1]

Examples 10 to 18 Using a polyethylene-glycidylmethacrylate binary copolymer (trade name: Bondfast E), the adhesive layer film 1 having a thickness of 50 μm was obtained in the same manner as in Example 1.
Between the PET film 2 of 38 μm thick and the thickness of 3 μm
A heat-crosslinkable polyurethane primer was used to obtain a laminated film by a dry lamination method. The same evaluation as in Example 1 was performed using the obtained laminated film, and the results are shown in Table 2.

[0022]

[Table 2]

Comparative Examples 1 to 9 Comparative Example 1 was carried out in the same manner as in Example 1 except that the type of the polymer used as the base of the conductor embedding layer was changed as shown in Table 3.
-9 tape electric wires were obtained. These tape electric wires were similarly evaluated and the results are shown in Table 3 below.

[0024]

[Table 3]

According to the results of Tables 1 to 3 above, the tape electric wire according to the example of the present invention not only gives good results in the above-mentioned high temperature bending test and heat resistance test, but also has a movable wiring property and a terminal treatment property. All of them showed excellent evaluation results, and no remarkable greening was observed. On the other hand, according to the comparative example, for example, the comparative examples 7 and 8 excellent in the movable wiring property are provided.
Is that there is a problem in the terminal processability and that green coloration is recognized, and Comparative Examples 3 and 4 that have excellent terminal processability have a difficulty in movable wiring, so avoid those that lack comprehensive balance of characteristics. It was clear that they could not.

[0026]

As is apparent from the above description and the results of the above-mentioned examples, the flame-retardant heat-resistant tape wire of the present invention has an adhesive layer in which a conductor is embedded even when left in a high temperature environment such as 105 ° C. Since the bent end of the electric conductor does not peel off, there is almost no risk of insulation failure of the electric conductor due to air and water, and there is no possibility of contact between electric conductors or short-circuit accidents. The wiring property is remarkably excellent, and an effect capable of eliminating the above conventional problems is exhibited.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a laminated film used for a tape electric wire of the present invention.

FIG. 2 is an explanatory view of a conductor installation between laminated films.

FIG. 3 is a sectional view of a tape electric wire according to an embodiment.

FIG. 4 is a schematic explanatory view of a tape electric wire bending test.

FIG. 5 is a cross-sectional view of a conventional laminated film for tape electric wire.

FIG. 6 is a conventional layout diagram of conductors between laminated films.

FIG. 7 is a cross-sectional view of a conventional tape electric wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copolymer film layer (conductor embedding layer) 2 Polyester resin film layer 3 Laminated film 4 Crosslinking type primer layer 5 Electric conductor

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[Procedure amendment]

[Submission date] October 5, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

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[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

Claims (1)

[Claims] 1. A binary or ternary copolymer film layer of polyolefin and glycidyl methacrylate and a polyester resin film layer are directly laminated, or a crosslinkable primer layer is interposed between both film layers if necessary. The two laminated films thus formed are made to face each other with their copolymer film layers facing each other, and a plurality of electric conductors are separated and sandwiched between the laminated films at a desired interval to be integrated. A heat-resistant tape electric wire, which is characterized by being cross-linked by irradiating free radiation or visible light.