JP2002080813A - Adhesive composition and insulating tape for flat cable using this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive composition having an excellent adhesion and flame retardance and an insulating tape for flat cables using this. SOLUTION: The adhesive composition comprises at least (A) a saturated copolymerized polyester containing at least one of (A1) a saturated copolymerized polyester having a melting point of >=90 deg.C but <130 deg.C and (A2) a saturated copolymerized polyester having a melting point of from 130 to 180 deg.C, and (C) a flame retardant, (D) a flame retardant auxiliary and (E) an antioxidant and optionally (B) a polyolefin resin. Here, the amount of component (C) mixed is from 40 to 120 pts.wt. against 100 pts.wt. the total of components (A) and (B).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an adhesive composition and an insulating tape for flat cables using the same.

[0002]

2. Description of the Related Art Generally, an insulating tape used for manufacturing a flat cable is formed by forming an adhesive layer on an insulating film such as a polyester film (PET film). As a material for forming the adhesive layer, a solvent-soluble adhesive and a solvent-insoluble adhesive are used. When a solvent-soluble adhesive is used, the adhesive is dissolved in a solvent in advance and coated on an insulating film using a roll coater or the like to form an adhesive layer. When using a solvent-insoluble adhesive,
The resin film is melted at a high temperature, formed into a film shape by a T-die, and extruded and laminated on an insulating film to form an adhesive layer.

[0003]

However, when the above-mentioned conventional adhesive is used, it does not have sufficient adhesiveness in an environment where a flat cable is used (low-temperature to high-temperature atmosphere). There was a disadvantage that it was inferior in flame retardancy.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an adhesive composition excellent in both adhesiveness and flame retardancy and an insulating tape for a flat cable using the same. And

[0005]

In order to achieve the above object, the present invention provides at least the following components (A) and (B), and the following components (C) to (E): And the amount of the component (C) is 40 to 12 with respect to 100 parts by weight of the total of the components (A) and (B).
The adhesive composition set in the range of 0 parts by weight is a first gist. (A) A saturated copolymerized polyester containing at least one of the following (A1) and (A2). (A1) Saturated copolyester having a melting point of from 90 to less than 130 ° C. (A2) Saturated copolyester having a melting point of 130 to 180 ° C. (B) a polyolefin resin. (C) Flame retardants. (D) a flame retardant aid. (E) Antioxidants.

Further, the present invention provides a flat cable insulating tape comprising an insulating tape core base material (hereinafter referred to as "insulating film") having an adhesive layer comprising the above-mentioned adhesive composition formed on one surface thereof. The summary of the

[0007] That is, the present inventors have intensively studied to obtain an adhesive composition having excellent adhesion and flame retardancy. As a result, when at least one of a relatively low melting point saturated copolymerized polyester (A1) and a relatively high melting point saturated copolymerized polyester (A2) is used, and a flame retardant, a flame retardant auxiliary agent, etc. are used in combination, The present inventors have found that the object of the invention can be achieved, and arrived at the present invention.

When a flat particle filler is used in addition to the above-mentioned components A to E, the adhesive force can be stabilized and the cost can be reduced by increasing the bulk.

When the polyolefin resin (component B) is a maleic anhydride-modified ethylene copolymer, the adhesiveness is further improved.

[0010]

Next, embodiments of the present invention will be described in detail.

The adhesive composition of the present invention comprises a specific saturated copolymerized polyester (component A), a polyolefin resin (component B), a flame retardant (component C), and a flame retardant auxiliary (component D). , An antioxidant (component E).

The specific saturated copolymerized polyester (component A) contains at least one of a saturated copolymerized polyester (A1) having a melting point of 90 to less than 130 ° C. and a saturated copolymerized polyester (A2) having a melting point of 130 to 180 ° C. There is no particular limitation as long as it does.

In the present invention, the saturated copolymerized polyester (component A) is an ester bond (-COO) in the main chain.
It means a linear polymer having-), such as an unsaturated polyester, which does not have an unsaturated bond in a molecule and thus does not cross-link and cure. It is a kind of thermoplastic resin.

The above saturated copolymerized polyester (component A)
Can be obtained, for example, by copolymerizing a dicarboxylic acid component and a diol component. The melting point and the like can be freely adjusted by changing the combination and mixing ratio of these components, or by randomly copolymerizing other components.

As the above dicarboxylic acid component, for example,
Aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid;
And aliphatic dicarboxylic acids such as adipic acid and sebacic acid. These may be used alone or in combination of two or more.

Examples of the diol component include ethylene glycol, 1,4-butanediol, diethylene glycol, neopentyl glycol and the like.
These may be used alone or in combination of two or more.

The saturated copolymer polyester (A2) having a melting point of 130 to 180 ° C. is preferably a carboxylic acid-modified polyester. The carboxylic acid-modified saturated copolymerized polyester (A2) can be obtained by, for example, randomly copolymerizing trimellitic acid or the like.

The acid-modified saturated copolymerized polyester (A2) preferably has an acid value in the range of 10 to 200 eq / ton, particularly preferably 50 to 150 eq / t.
is on. That is, if the acid value is less than 10 eq / ton, a sufficient adhesive force cannot be obtained, and
If eq / ton is exceeded, adverse effects such as an increase in hygroscopicity, promotion of hydrolysis, promotion of corrosion of the adherend (metal or the like), and gelation may occur.

The saturated copolymer polyester (A2) having a melting point of 130 to 180 ° C. is more preferably modified with both carboxylic acid and sodium sulfonate. When a polar group such as sodium sulfonate group is introduced, the hydrogen bond with the metal (conductor) surface used as the core wire of the flat cable becomes stronger, and only the carboxylic acid modification can be performed even at a low lamination temperature. This is more preferable because the adhesive strength is higher than that of

The sodium sulfonate-modified saturated copolymer polyester (A2) preferably has a sodium sulfonate polar group content in the range of 50 to 200 eq / ton, particularly preferably 100 to 200 eq / ton. That is, the amount of the sodium sulfonate polar group is 50
If it is less than eq / ton, the effect of improving the adhesive strength cannot be sufficiently obtained. Conversely, if it exceeds 200 eq / ton, the water resistance becomes poor, and the wet heat resistance may be reduced to a practically problematic level. Because there is.

Of the above-mentioned saturated copolymerized polyester (component A), the saturated copolymerized polyester (A
2) The acid modification is performed only when acid modification of the saturated copolymerized polyester (A1) on the low melting point side causes gelation when a flame retardant (component (C)) or a filler is mixed, resulting in extremely low fluidity. In contrast, if the high-melting-point saturated copolymerized polyester (A2), whose molecular motion is relatively suppressed, is acid-modified, the series of processing is not hindered, and the adhesiveness is reduced. It is because it can improve.

As described above, the specific saturated copolymerized polyester (component (A)) is composed of a saturated copolymerized polyester (A1) having a melting point of less than 90 to 130 ° C. and a melting point of 130 to 180.
At least one of a saturated copolymerized polyester (A2) having a melting point of 90 to 130 ° C and a melting point of 130 to 18 ° C.
Those containing both the saturated copolymerized polyester (A2) at 0 ° C. are preferred. As described above, by using two types of polyesters having different melting points in combination, it is possible to lower the heating temperature when manufacturing a flat cable and to maintain the heat resistance of the flat cable itself. Then, when both are used together, the mixing ratio is A by weight.
1 / A2 = 80/20 to 20/80 is preferable,
Particularly preferably, A1 / A2 = 60/40 to 30/70.

The polyolefin resin (component (B)) is not particularly limited, but is preferably a polyethylene resin from the viewpoint of melting point, compatibility and the like. Examples of the polyethylene resin include an ethylene-acrylic acid copolymer (E
AA), ethylene-methacrylic acid copolymer (EMA)
A), ethylene-methyl acrylate copolymer (EM
A), ethylene-methyl methacrylate copolymer (EM
MA), ethylene-ethyl acrylate copolymer (EE
A), ethylene-vinyl acetate copolymer (EVA), low density polyethylene (LDPE), high density polyethylene (H
DPE), ultra-low-density polyethylene (ULDPE), or those obtained by graft-polymerizing maleic anhydride thereto. These may be used alone or in combination of two or more. Among them, those modified with maleic anhydride are preferable from the viewpoint of excellent adhesiveness.

In the adhesive composition of the present invention, the polyolefin resin (component B) is an optional component, but is preferably used. When the above-mentioned polyolefin resin (component B) is used, when the adhesive composition is kneaded with a twin-screw kneader or a kneader, or when the adhesive composition is processed into a film by an extruder, it is discharged. This is because there is an effect of improving the overall workability such as increasing the amount, reducing the neck-in, and reducing the film thickness. The reason is that the above polyolefin resin (component B) has a relatively small temperature dependency of the melt viscosity and does not cause a sharp decrease in viscosity when heated and melted. It is presumed to improve.

The above saturated copolymerized polyester (component A)
And the blending ratio of the polyolefin-based resin (B component) is preferably in the range of A component / B component = 100/0 to 50/50 by weight ratio, and particularly preferably A / B component = 95 /.
5 to 75/25.

The flame retardant (component (C)) is not particularly limited. For example, ethylene bispentabromodiphenyl,
Brominated flame retardants such as decabromodiphenyl oxide, hexabromobenzene and brominated bisphenol A; chlorinated flame retardants such as chlorinated paraffin, chlorinated polyethylene and perchloropentacyclodecane; phosphate esters, red phosphorus and ammonium polyphosphate And phosphorus-based flame retardants such as polyphosphoramide. These can be used alone or 2
Used in combination of more than one species.

The flame retardant (component C) has an average particle size of 5 μm.
m or less is preferable. That is, the average particle size is 5 μm
The followings have good dispersibility, are unlikely to cause a problem such as poor appearance at the time of laminating a flat cable due to fish eyes when formed into a film, and can sufficiently obtain a flame retardant effect. The average particle size is a value measured using a laser diffraction type particle size distribution meter.

The amount of the flame retardant (component C) is 100 parts by weight (hereinafter abbreviated as "parts") of the saturated copolymerized polyester (component A) and the polyolefin resin (component B).
Must be set in the range of 40 to 120 parts, preferably 60 to 100 parts. That is, 40
If the amount is less than 0.1 part, the flame retardancy of the UL standard cannot be satisfied. Conversely, if the amount exceeds 120 parts, the adhesive strength decreases.

The flame retardant aid (component D) is not particularly limited, and includes, for example, antimony trioxide, zinc borate, aluminum hydroxide, magnesium hydroxide, melamine and the like. These may be used alone or in combination of two or more.

The amount of the flame retardant auxiliary (component D) is preferably in the range of 5 to 60 parts based on 100 parts of the total of the saturated copolymerized polyester (component A) and the polyolefin resin (component B). And particularly preferably 5 to 40 parts.

The antioxidant (component E) is not particularly limited as long as it can prevent oxidation during heat kneading. For example, hindered phenol antioxidants, copper antioxidants, sulfur antioxidants And the like. These may be used alone or in combination of two or more.

The amount of the antioxidant (component E) is 0.5 to 5 based on 100 parts of the total of the saturated copolymerized polyester (component A) and the polyolefin resin (component B).
Is preferably in the range of 0.5 to 3 parts.

The adhesive composition of the present invention contains the above A
A filler, a pigment and the like may be blended in addition to the components E to E.

Examples of the filler include talc, clay, synthetic mica, heavy calcium carbonate, silica, titanium dioxide and the like. These may be used alone or in combination of two or more. Note that the titanium dioxide is used for imparting concealment to make conductor wiring of the flat cable invisible.

The talc and the synthetic mica are preferably in the form of flat particles. When the flat particles are used as described above, the elastic modulus of the adhesive layer can be improved without deteriorating the adhesiveness, and the bending durability life of the flat cable can be extended. In the present invention, the flat particles are particles having a shape such as a flat plate, a needle, and a bar which are easily oriented in a plane when the adhesive layer is formed.

It is preferable that the flat particle filler has an aspect ratio in the range of 5 to 100.

The proportion of the filler is preferably in the range of 5 to 60 parts, more preferably 5 to 60 parts, based on 100 parts of the total of the saturated copolymerized polyester (component A) and the polyolefin resin (component B). 40 parts.

The adhesive composition of the present invention can be prepared, for example, using the above-mentioned A
To E and, if necessary, a filler or the like, and the mixture is kneaded using a kneader such as a biaxial kneader or a kneader.

Next, an insulating tape for a flat cable using the adhesive composition of the present invention will be described. In this flat cable insulating tape, for example, as shown in FIG. 1, an anchor coat layer 2 is formed on the surface of an insulating film 1, and an adhesive made of the above adhesive composition is further formed on the surface of the anchor coat layer 2. The layer 3 is formed.

The insulating film 1 serving as the core substrate of the insulating tape is not particularly limited. For example, a polyester (PET) film, a polyimide (PI) film, a polyethylene naphthalate (PEN) film, a polyphenylene sulfide ( (PPS) film, polyetheretherketone (PEEK) film, polyetherimide (PEI) film, polyethersulfone (PES) film and the like. Among them, a PET film is preferably used in terms of mechanical strength, electrical insulation, heat resistance, cost, and the like.

The anchor coat layer 2 formed on the surface of the insulating film 1 is formed to improve the adhesion between the insulating film 1 and the adhesive layer 3, but the anchor coat layer 2 is omitted. No problem. The anchor coating agent used as a material for forming the anchor coat layer 2 is not particularly limited, and is, for example, a two-component aromatic ester-based urethane-based adhesive composed of a solvent-soluble copolymerized polyester and an isocyanate-based curing agent. Agents and the like.

The method of applying the anchor coating agent is not particularly limited, and examples thereof include a roll coating method and a gravure coating method.

The insulating tape shown in FIG.
It can be manufactured as follows. That is, first, as shown in FIG. 2, the adhesive composition and the resin for the separator are supplied from the hoppers 4 and 5 to the extruders 6 and 7, respectively. Then, the long cylindrical body 9 having a three-layer structure is continuously formed by co-extrusion of the adhesive composition from the round die 8 in a state of sandwiching the adhesive composition with a separator resin. As shown in FIG. 3, the long cylindrical body 9 has a three-layer structure in which separator resin layers 11 and 12 are formed on the inner and outer peripheral surfaces of an adhesive layer 10. Further, air is blown into the inside of the long cylindrical body 9 to expand it (thereby extending in the horizontal direction), and at the same time, the upper part of the long cylindrical body 9 is sandwiched by pinch rolls 13 and pulled up while rotating in the forward and reverse directions. By doing so (stretching in the vertical direction), uneven wall thickness of the long cylindrical body 9 is prevented. Although not shown, a predetermined number (usually three) of ring-shaped guide plates are provided at predetermined intervals near the outer peripheral portion of the long cylindrical body 9.

Then, after winding the long cylindrical body 9 in a folded state, the long cylindrical body 9 is conveyed to the cutter 14 and both sides of the long cylindrical body 9 are cut along the lengthwise direction of the cutter 14 (only one side in FIG. (Shown) to form a film 15 continuously and wind it up on a roll 18. The above film 15
Has a three-layer structure in which separator resin layers 16 and 17 are formed on both surfaces of the adhesive layer 3 as shown in FIG.

On the other hand, as shown in FIG.
Is prepared and an anchor coat treatment (AC) is performed on the surface to form an anchor coat layer (not shown). Then, the separator resin layer 16 (or 17) on one side was peeled off from the film 15 wound up on the roll 18 to expose the adhesive layer 3, and formed on the adhesive layer 3 and the surface of the insulating film 1. An anchor coat layer (not shown) is opposed and continuously bonded to each other, and wound around a roll 19. Thereafter, the remaining separator resin layer 17 (or 16) is peeled off from the surface of the adhesive layer 3. Thereby, as shown in FIG. 1, an anchor coat layer 2 is formed on the surface of the insulating film 1, and an adhesive layer 3 is further formed on the surface of the anchor coat layer 2.
An insulating tape having a layer structure can be obtained.

The resin for the separator is not particularly limited as long as it is a resin incompatible with the adhesive composition, and examples thereof include a polyethylene resin and a polypropylene resin. These may be used alone or in combination of two or more. Among them, polyethylene resin is preferably used because it has excellent releasability from the adhesive layer and is inexpensive.

The method of manufacturing the insulating tape for a flat cable according to the present invention is not limited to the above-described co-extrusion manufacturing method using a round die.
It may be manufactured by a die extrusion lamination method.

In the thus obtained insulating tape for a flat cable of the present invention, the adhesive layer 3 has a thickness of 10 to 10.
It is preferably in the range of 50 μm, particularly preferably 20 to 40.
μm. The thickness of the insulating film 1 is usually 12
To 250 μm, and the thickness of the anchor coat layer 2 is usually in the range of 0.1 to 10 μm.

The flat cable insulating tape of the present invention can be used, for example, for manufacturing a flexible flat cable (FFC) as shown in FIG. That is, two insulating tapes 24 each having an anchor coat layer 22 formed on the surface of the insulating film 21 and an adhesive layer 23 formed on the surface of the anchor coat layer 22 are prepared. By bonding the surface of the layer 23 to both surfaces of the conductor 25, a flexible flat cable (FFC) can be manufactured.

The conductor 25 is, for example, a rectangular copper wire plated with tin. Note that those having a thickness of 20 to 50 μm and a width of 0.3 to 1.0 mm are often used.

Next, examples will be described together with comparative examples.

First, prior to Examples and Comparative Examples, the following materials were prepared.

[Saturated copolymerized polyester (A1)] manufactured by Toyobo Co., Ltd., Byron GM990S [melting point: 120 ° C., number average molecular weight: 30,000]

[Saturated copolymerized polyester (A1)] Carboxylic acid-modified polyester (manufactured by Toyobo Co., Byron SF)
-3) [melting point 119 ° C, acid value 100 eq / ton, number average molecular weight 30,000]

[Saturated copolymerized polyester (A2)] Carboxylic acid-modified polyester (manufactured by Toyobo Co., Byron GM)
440) [melting point: 143 ° C., acid value: 134 eq / ton, number average molecular weight: 20,000]

[Saturated copolymerized polyester (A2)] manufactured by Toyobo Co., Ltd., Byron SF-2 [melting point: 144 ° C., number average molecular weight: 17,000]

[Saturated Copolyester (A2)] Polyester modified with both carboxylic acid and sodium sulfonate (Vylon GM4 manufactured by Toyobo Co., Ltd.)
45) [melting point: 133 ° C, sodium sulfonate polar group content: 156 eq / ton, acid value: 155 eq / ton, number average molecular weight: 20,000]

[Saturated copolymerized polyester a] manufactured by Toray Industries, Inc.
Chemit R-99 [melting point 75 ° C, number average molecular weight 23.0
00]

[Saturated copolymerized polyester b] manufactured by Toyobo Co., Ltd., Byron GM470 [melting point 185 ° C, number average molecular weight 30,000]

[Polyolefin resin (component B)] U
LDPE-MAH (manufactured by Mitsui Petrochemical Co., Ltd., Admer SF6)
00) [density 0.88 g / cm ³ , MFR (190 ° C.)
3.5g / 10min]

[Polyolefin resin (component B)] Ethylene-methacrylic acid copolymer (EMAA) (Nucrel 4213C, manufactured by DuPont-Mitsui Polychemicals) [density 0.94 g / cm ³ , MFR (190 ° C.) 10 g / 1
0 min]

[Flame Retardant (Component C)] Brominated flame retardant: ethylene bispentabromodiphenyl (Cytex 8010, manufactured by Albemarle Co., Ltd.) [Average particle diameter: 1-2 μm, melting point: 345 ° C.]

[Flame Retardant (Component C)] Chlorine-based flame retardant: Perchloropentacyclodecane (Dechlorane Plus 35, manufactured by Okididental Chemical Co., Ltd.) [Average particle size 2 μm or less, melting point 350 ° C.]

[Flame retardant aid (D component)] Antimony trioxide (Sb ₂ O ₃ ) [Average particle size 2.1 μm]

[Flame retardant (D component)] Zinc borate

[Antioxidant (E component)] Hindered phenolic antioxidant (Irganox 1010, manufactured by Ciba-Geigy)

[Filler] Titanium dioxide (manufactured by Ishihara Sangyo Co., Ltd.)
Typek CR-58) [Average particle size 0.2 μm]

[Filler] Talc (Shimgon, manufactured by Nippon Talc) [Average particle size: 1 to 3 μm]

[0069]

Example 1 First, an adhesive composition was prepared by blending the components shown in Table 1 below in the proportions shown in the table. In addition, a polyethylene resin was prepared as a resin for the separator.
Further, a corona-treated PET film is prepared as an insulating film, an anchor coating agent is applied to the surface of the PET film by a gravure coating method, and dried (90).
(° C. × 20 seconds) to form an anchor coat layer. Then, using these materials, an insulating tape was produced according to the coextrusion manufacturing method using the above-mentioned round die.

That is, the above-mentioned adhesive composition and polyethylene resin (resin for separator) were supplied from a hopper to an extruder. Then, by extruding the adhesive composition from a round die into a long cylindrical shape with the adhesive composition sandwiched between polyethylene resins (resin for the separator), a separator resin layer is formed on the inner and outer peripheral surfaces of the adhesive layer. A three-layered long cylindrical body was continuously formed. further,
Air is blown into the inside of the long cylindrical body to expand it (they are stretched in the horizontal direction), and at the same time, the upper part of the long cylindrical body is pinched by a pinch roll and pulled up while rotating in the forward and reverse directions (in this way, in the vertical direction). ) To prevent uneven wall thickness of the long cylindrical body.

Then, after winding the long cylinder in a folded state, it is conveyed to a cutter portion, and both sides of the long cylinder are cut open along the longitudinal direction by a cutter, and an adhesive layer (40 μm in thickness) is formed. On both sides of the separator resin layer (thickness 30μ)
A film having a three-layer structure on which m) was formed was continuously formed, and the film was wound around a roll.

Then, the separator resin layer on one side is peeled off from the film wound on the roll to expose the adhesive layer, and the adhesive layer and the anchor coat layer formed on the surface of the PET film prepared before are separated. Were confronted with each other continuously and wound up on a roll. afterwards,
The remaining separator resin layer is peeled off from the surface of the adhesive layer to form an anchor coat layer (thickness: 1 μm) on the surface of the insulating film (thickness: 23 μm). ) Was formed to produce an insulating tape.

[0073]

Examples 2 to 11 and Comparative Examples 1 to 5 The same as Example 1 except that an adhesive composition was used in which the components shown in Tables 1 to 3 below were blended in the proportions shown in the table. To produce an insulating tape.

Using the insulating tapes of the examples and the comparative examples thus obtained, each characteristic was evaluated according to the following criteria. These results are shown in Tables 1 to 3 below.
Are also shown.

[Adhesive Strength] Using a hot roll, roll temperature 170 ° C., linear velocity 0.5 m / min, pressure about 0.59 MP
Under the conditions of a, a copper foil having a thickness of 50 μm and having a surface plated with tin was bonded to the adhesive layer side of each insulating tape. Next, this was cut into a size of 1 cm × 10 cm to prepare a sample. And JIS K 685
Room temperature (25 ° C.), pulling speed 50 mm
/ Min condition, a 180 ° peel test was performed, and the load when the copper foil was peeled from the sample by 180 ° was measured.
Thus, the adhesive strength (initial adhesive strength) of the adhesive layer was examined.

[Flame retardancy] The flame retardancy was evaluated according to the vertical combustion test described in UL Standard VW-1. And
Those that passed the above standard were evaluated as ○, and those that did not pass were evaluated as ×. In addition, what was especially excellent in flame retardance was shown as (double-circle).

[0077]

[Table 1]

[0078]

[Table 2]

[0079]

[Table 3]

From the results in Tables 1 to 3, the product of the example was
It can be seen that all have high adhesive strength and excellent flame retardancy. On the other hand, it can be seen that the comparative example product is inferior in any of the properties of adhesiveness and flame retardancy.

Next, using the adhesive composition having the compounding ratio described in Example 6, Example 10, or Example 11, a core wire (tin-plated foil conductor) used in an actual flat cable was used. Bonding was performed at a predetermined lamination temperature. Then, in accordance with JIS K 6854, the core wire is folded back at 180 ° and peeled off at 180 ° to obtain a room temperature (25 ° C.).
° C), adhesive strength (g / mm) at a pulling speed of 50 mm / min
Was measured. The results are shown in Table 4 below.

[0082]

[Table 4]

From the results shown in Table 4, the difference in the adhesive strength between the product of Example 10 and the product of Example 11 was lower as the laminating temperature was lower. This is because the product of Example 6 uses a polyester modified with a carboxylic acid, whereas the product of Example 10 and Example 11 uses a polyester modified with both carboxylic acid and sodium sulfonate. Because of the introduction of a polar group such as sodium sulfonate group, the hydrogen bond with the metal (conductor) surface becomes stronger, and the adhesive strength is lower than that of only carboxylic acid modification even at low lamination temperature. Is likely to be higher.

[0084]

As described above, the adhesive composition of the present invention uses at least one of a relatively low melting point saturated copolymerized polyester (A1) and a relatively high melting point saturated copolymerized polyester (A2). Since this is used together with a flame retardant, a flame retardant auxiliary, etc., it has sufficient adhesiveness and excellent flame retardancy in an environment where a flat cable is used (low to high temperature atmosphere). .

When a filler is used in addition to the above-mentioned components A to E, the adhesive force can be stabilized, and the cost can be reduced by increasing the bulk.

When the polyolefin resin (component B) is a maleic anhydride-modified ethylene copolymer, the adhesiveness is further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of the flat cable insulating tape of the present invention.

FIG. 2 is an explanatory diagram showing steps until an adhesive composition and a resin for a separator are formed into a film.

FIG. 3 is a cross-sectional view showing a three-layer structure long cylinder in which a separator resin layer is formed by coating the inner and outer peripheral surfaces of an adhesive layer.

FIG. 4 is a cross-sectional view showing a film having a three-layer structure in which a separator resin layer is formed on both surfaces of an adhesive layer.

FIG. 5 is an explanatory view showing a step of bonding an insulating film and an adhesive layer.

FIG. 6 is a cross-sectional view showing a flexible flat cable (FFC) using the insulating tape for flat cables of the present invention.

[Explanation of symbols]

 Reference Signs List 1 insulating film 2 anchor coat layer 3 adhesive layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) // C09J 167/02 C09J 167/02 (72) Inventor Hirokazu Sakai 1-3-1, Higashi 3-chome, Komaki City, Aichi Prefecture Tokai Rubber Industry Co., Ltd. (72) Inventor Kozo Kitamura 3-1, Higashi 3-chome, Komaki City, Aichi Prefecture 4J040 BA182 DA021 DA022 DA051 DA061 DA071 DA161 DE031 DF011 DF041 DF051 DL061 ED031 ED091 GA03 GA25 GA32 HA056 HA116 HA136 HA156 HA286 HA326 HB02 HB05 HB06 HB25 HB36 HD24 JA09 JB01 KA01 KA29 LA06

Claims (9)

[Claims] Claims: 1. A composition comprising at least the following components (A) and (B) and the following components (C) to (E), and the amount of the component (C) is: 40 to 12 based on a total of 100 parts by weight of the components (A) and (B)
An adhesive composition which is set in a range of 0 parts by weight. (A) A saturated copolymerized polyester containing at least one of the following (A1) and (A2). (A1) Saturated copolyester having a melting point of from 90 to less than 130 ° C. (A2) Saturated copolyester having a melting point of 130 to 180 ° C. (B) a polyolefin resin. (C) Flame retardants. (D) a flame retardant aid. (E) Antioxidants. 2. The adhesive composition according to claim 1, further comprising a filler. 3. The saturated copolymerized polyester (A2)
Is a carboxylic acid-modified product.
The adhesive composition as described in the above. 4. The saturated copolyester (A2)
Is an adhesive composition according to any one of claims 1 to 3, which is modified with both a carboxylic acid and sodium sulfonate. 5. The adhesive composition according to claim 1, wherein the acid value of the saturated copolymerized polyester (A2) is set in a range of 10 to 200 eq / ton. 6. The adhesive composition according to claim 1, wherein the polyolefin resin as the component (B) is an ethylene copolymer or a maleic anhydride-modified ethylene copolymer. . 7. The flame retardant of component (C) having an average particle size of 5
The adhesive composition according to any one of claims 1 to 6, which has a size of not more than μm. 8. The adhesive composition according to claim 2, wherein the filler is in the form of flat particles. 9. An insulating tape for a flat cable, wherein an adhesive layer comprising the adhesive composition according to any one of claims 1 to 8 is formed on one surface of an insulating tape core substrate.