JP2007031548A - Adhesive composition and insulating tape for flat cable using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive composition which can reduce adhesion of an adhesive agent to a laminate role upon lamination. <P>SOLUTION: The composition comprises the following components (A) to (E) wherein an amount of the component (B) to be incorporated is 40-140 pts.wt. relative to 100 pts.wt. of the component (A); (A): at least one of the following (A1) and (A2); (A1) a saturated copolyester of a melting point of ≥90°C but <130°C, (A2) a saturated copolyester of a melting point of 130-180°C; (B): a fire retardant, (C): a fire retardant auxiliary agent, (D): an antioxidant and (E): an aluminum-based coupling agent. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an adhesive composition and an insulating tape for a flat cable using the same, and more specifically, insulation of a flat cable used for electrical equipment, electronic equipment, automobile electrical wiring, household indoor or outdoor wiring, and the like. The present invention relates to an adhesive composition suitably used as an adhesive material for an insulating tape, which is a covering material for protection, and an insulating tape for a flat cable using the same.

In general, an insulating tape is used as a coating material for insulating protection of a flat cable (flat electric wire) used for electrical equipment, electronic equipment, automobile electrical wiring, indoor or outdoor wiring for home use, and the like. Such an insulating tape usually has an anchor coat layer formed by applying an anchor coating agent on an insulating film such as a polyester film (PET film) which is a base material of the insulating tape, and is further adhered to the surface thereof. An agent layer is formed. As the adhesive material for forming the adhesive layer, for example, various adhesives such as thermosetting polyester, thermoplastic polyester, polyolefin, etc. are used. System adhesives are widely used (see, for example, Patent Documents 1 and 2).
JP-A-11-7838 JP 2002-80813 A

  In general, the flat cable is manufactured by sandwiching a conductor made of a tinned core wire or the like between the adhesive layer surfaces of the two insulating tapes and laminating them continuously using a laminating roll (heat roll). Yes. Of the insulating tapes laminated on both sides of the conductor, one insulating tape is usually provided with holes (windows) at regular intervals in order to form the terminal portion of the flat cable. Therefore, when laminating, the adhesive protrudes from the hole (window) portion, the end portion of the insulating tape, etc., and the adhesive adheres to the surface of the laminate roll. As a result, the adhesive attached to the laminate roll is mixed into the product (flat cable, etc.), and the pressure of the roll fluctuates due to the adhesive attached to the laminate roll surface, which adversely affects the quality of the product. There is a difficulty. In addition, since it is necessary to periodically clean the laminate roll, there is a problem that productivity is inferior.

  The present invention has been made in view of such circumstances, and provides an adhesive composition that can reduce adhesion of an adhesive to a laminate roll during lamination, and an insulating tape for a flat cable using the same. For that purpose.

In order to achieve the above object, the present invention contains the following components (A) to (E), and the blending amount of the component (B) is based on 100 parts by weight of the component (A). Let the adhesive composition which exists in the range of 40-140 weight part be a 1st summary.
(A) At least one of the following (A1) and (A2) [(A1) and / or (A2)].
(A1) A saturated copolyester having a melting point of 90 ° C. or higher and lower than 130 ° C.
(A2) A saturated copolyester having a melting point of 130 ° C. or higher and 180 ° C. or lower.
(B) Flame retardant.
(C) Flame retardant aid.
(D) Antioxidant.
(E) Aluminum coupling agent.

  Further, the present invention provides a flat cable insulating tape in which an adhesive layer made of the above adhesive composition is formed on one side of an insulating tape core substrate (hereinafter referred to as “insulating film”). To do.

  That is, the present inventors have made extensive studies in order to obtain an adhesive composition that can reduce adhesion of the adhesive to the laminate roll during lamination. And since adhesion of the adhesive to the laminating roll at the time of lamination is related to the fluidity of the adhesive, research has been repeated focusing on lowering the fluidity of the adhesive. As described above, as a method for reducing the fluidity of the adhesive, a method of increasing the amount of filler components such as a flame retardant and a method of using a resin having a high viscosity can be considered. However, in the method of increasing the amount of filler components such as flame retardant, the filler components are aggregated to generate aggregates, and thus there are problems such as poor product appearance and poor quality. Moreover, the technique using the above-mentioned resin having a high viscosity has drawbacks such as a decrease in adhesive strength. Therefore, the present inventors repeated experiments on various coupling agents as a method for adjusting the fluidity of the adhesive by using a coupling agent in combination instead of these methods. The titanium-based coupling agent has a large amount of alcohol desorption during kneading with a kneader, and the resin is hydrolyzed and deteriorated. Therefore, the effect of lowering the fluidity of the adhesive is insufficient. The silane coupling agent produces a functional group by blending with water and exhibits its effect. However, when water is added to the adhesive composition, the resin is hydrolyzed and deteriorates, so that the adhesive composition Water cannot be blended into the product. For this reason, even if the silane coupling agent is added, the adhesive cannot be fully used, and the fluidity of the adhesive is deteriorated. On the other hand, an aluminum coupling agent is an adhesive agent because it has good compatibility with filler components such as flame retardants, flame retardant aids, antioxidants, and saturated copolyesters, and increases the cohesive strength of the adhesive composition. It has been found that the fluidity of the liquid drops. As a result, together with at least one of a relatively low melting point saturated copolymerized polyester (A1) and a relatively high melting point saturated copolymerized polyester (A2), a predetermined amount of flame retardant, flame retardant aid, antioxidant and aluminum-based It has been found that when a coupling agent is used in combination, the fluidity of the adhesive can be reduced, and adhesion of the adhesive to the laminate roll during lamination can be reduced, and the present invention has been achieved.

  As described above, the adhesive composition of the present invention comprises a predetermined amount of a flame retardant and a difficulty together with at least one of the relatively low melting point saturated copolymer polyester (A1) and the relatively high melting point saturated copolymer polyester (A2). Combustion aid, antioxidant and aluminum coupling agent are used in combination. As described above, the aluminum-based coupling agent has good compatibility with filler components such as flame retardant aids and antioxidants and saturated copolymerized polyester, and increases the cohesive strength of the adhesive composition. The fluidity of the agent can be reduced. And, the insulating tape for flat cable of the present invention formed by forming an adhesive layer using this adhesive composition is used for laminating the adhesive from the hole portion of the insulating tape or the end portion of the insulating tape at the time of lamination. It is possible to suppress the protrusion and to reduce the adhesion of the adhesive to the laminate roll. Therefore, the adhesive adhered to the laminate roll is hardly mixed into the product (flat cable or the like), and the product quality is improved. Further, since the periodic cleaning of the laminate roll is unnecessary, productivity is improved.

  In addition to the components A to E, when an adhesive composition containing a filler is used, the adhesive force can be stabilized and the cost can be reduced.

  Moreover, when the compounding quantity of the said aluminum coupling agent (E component) is in a predetermined range, the fluidity fall effect of an adhesive agent and the adhesive effect can be made compatible in a suitable range. The effect is obtained.

  In addition, as described above, when the high-melting point saturated copolymer polyester (A2) whose molecular motion is relatively suppressed is modified with carboxylic acid, gelation occurs when the flame retardant (component B) or filler is mixed. It does not occur, the workability is improved and the adhesiveness is improved.

  Further, when the specific saturated copolymerized polyester (A2) is modified with both carboxylic acid and sodium sulfonate, it is used as a core wire of a flat cable by introducing a polar group such as a sodium sulfonate group. As a result, the hydrogen bond with the surface of the metal (conductor) to be obtained becomes stronger, and an effect of increasing the adhesive force even at a low laminating temperature is obtained as compared with the case of only modification with carboxylic acid.

  And when the acid value of the said specific saturated copolyester (A2) is in a predetermined range, balance, such as adhesiveness, moisture absorption resistance, hydrolysis resistance, will become favorable.

  In addition, if the average particle diameter of the flame retardant (component B) is 5 μm or less, the dispersibility is good, and it is difficult to cause a problem of poor appearance when the flat cable is bonded to the fish eye when the film is formed. A flame-retardant effect can be sufficiently obtained.

  In addition, as described above, when two types of saturated copolyesters having different melting points are used in combination at a predetermined ratio, the heating temperature during the production of the flat cable can be lowered, and the heat resistance of the flat cable itself is maintained. The effect that it can do is acquired.

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

  The adhesive composition of the present invention comprises a specific saturated copolyester (A component), a flame retardant (B component), a flame retardant aid (C component), an antioxidant (D component), and an aluminum-based adhesive composition. It can be obtained using a coupling agent (E component).

  In the present invention, a predetermined amount of a flame retardant (component B), a flame retardant aid (at least one of a relatively low melting saturated copolymer polyester (A1) and a relatively high melting saturated copolymer polyester (A2)). C component), an antioxidant (D component) and an aluminum coupling agent (E component) are used in combination, and these are the greatest features.

  In the present invention, the saturated copolymerized polyester (component A) is a kind of thermoplastic resin and refers to a linear polymer having an ester bond (—COO—) in the main chain. Since this does not have an unsaturated bond in the molecule, it is usually distinguished from an unsaturated polyester having an unsaturated bond in the molecule in that it does not cure by crosslinking.

  The method for producing the saturated copolymerized polyester (component A) is not particularly limited, and can be obtained, for example, by copolymerizing a dicarboxylic acid component and a diol component. Then, the melting point and the like can be freely adjusted by changing the combination and blending ratio of these components, or by randomly copolymerizing other components.

  Examples of the dicarboxylic acid component include aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid, and aliphatic dicarboxylic acids such as adipic acid and sebacic acid, and are 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, and are used alone or in combination of two or more.

  In the present invention, the specific saturated copolyester (component A) is a saturated copolyester (A1) having a melting point of 90 ° C. or higher and less than 130 ° C., and a melting point of 130 ° C. or higher. At least one of the saturated copolyester (A2) in the range of 180 ° C. or lower is used. Thus, when at least one of the specific saturated copolyester (A1) and the specific saturated copolyester (A2) is used, an effect that the moldability at the time of cable laminating is improved is obtained. That is, when a saturated copolymer polyester having a melting point of less than 90 ° C. is used alone, the adhesive flows out during cable lamination, making it difficult to process, and conversely, a saturated copolymer polyester having a melting point exceeding 180 ° C. This is because when used alone, the core wire used for the cable is likely to be buried poorly.

  In the present invention, the saturated copolyester (A1) having a melting point of 90 ° C. or more and less than 130 ° C. preferably has a melting point of 100 ° C. or more and less than 130 ° C., particularly preferably. The melting point is in the range of 100 to 120 ° C.

  The specific saturated copolyester (A1) preferably has a melt viscosity in the range of 500 to 15000 Ps / 200 ° C, and particularly preferably has a melt viscosity in the range of 1000 to 10,000 Ps / 200 ° C.

  The acid-modified saturated copolyester (A1) preferably has an acid value in the range of 5 to 50 eq (equivalent) / ton, particularly preferably in the range of 5 to 20 eq / ton. .

  Next, as the saturated copolyester (A2) having a melting point of 130 ° C. or higher and 180 ° C. or lower, those having a melting point of 130 to 160 ° C. are preferred, and a melting point of 135 to 135 is particularly preferred. It is within the range of 150 ° C.

  The specific saturated copolyester (A2) preferably has a melt viscosity in the range of 200 to 6000 Ps / 200 ° C, particularly preferably a melt viscosity in the range of 1000 to 5000 Ps / 200 ° C.

  As the specific saturated copolyester (A2), as described above, the melt viscosity is in the range of 200 to 2000 Ps / 200 ° C. and the melt viscosity is relatively low (a), and the above ( You may use together (b) whose melt viscosity is higher than a). In this case, the content of the high melt viscosity (b) is preferably 80% by weight or less, particularly preferably in the range of 15 to 80% by weight, based on the total weight of the specific saturated copolyester (A2). It is. That is, within the above range, when the melt viscosity relatively low (a) and the melt viscosity higher than (a) (b) are used in combination, the filling of the core wire and the fluidity are compatible. be able to.

  In the present invention, the specific saturated copolyester (A2) is preferably acid-modified with carboxylic acid, sulfonic acid or the like from the viewpoint of adhesive strength with a metal (conductor) used as a core wire of a flat cable. . Among these, those modified with carboxylic acid are particularly preferable from the viewpoint of suppressing water absorption. The carboxylic acid-modified saturated copolymerized polyester (A2) can be obtained, for example, by randomly copolymerizing trimellitic acid or the like.

  The acid-modified saturated copolyester (A2) preferably has an acid value in the range of 10 to 300 eq (equivalent) / ton, particularly preferably in the range of 50 to 200 eq / ton. That is, when the acid value is less than 10 eq / ton, the adhesive strength tends to be inferior. On the other hand, when it exceeds 300 eq / ton, the hygroscopicity is increased, the hydrolyzability is promoted, the adherend (metal, etc.) This is because harmful effects such as corrosion promotion and gelation may occur.

  The specific saturated copolyester (A2) is more preferably modified with both carboxylic acid and sodium sulfonate. In this way, when a polar group such as a sodium sulfonate group is introduced, the hydrogen bond with the surface of the metal (conductor) used as the core wire of the flat cable becomes stronger, and only the carboxylic acid modification is possible even at a low lamination temperature. It is more preferable because the adhesive force is higher than that of the above.

  The saturated copolymerized polyester (A2) modified with sodium sulfonate preferably has a sodium sulfonate group amount in the range of 50 to 200 eq / ton, particularly preferably in the range of 100 to 200 eq / ton. . That is, when the amount of sodium sulfonate group is less than 50 eq / ton, the effect of improving the adhesive force tends to be deteriorated. Conversely, when it exceeds 200 eq / ton, the water resistance and the moist heat resistance tend to be deteriorated. Because.

  Of the saturated copolyesters (component A), only the high-melting-point saturated copolyester (A2) is acid-modified when the low-melting-point saturated copolyester (A1) is acid-modified. Gelation occurs when a fuel (component B), filler, etc. are mixed, the fluidity becomes extremely poor, and processing becomes impossible. On the other hand, the saturation movement on the high melting point side where molecular motion is relatively suppressed. This is because, when the polymerized polyester (A2) is acid-modified, the adhesiveness can be improved without hindering a series of processing.

  In the present invention, the specific saturated copolyester (component A) contains at least one of the specific saturated copolyester (A1) and the specific saturated copolyester (A2) as described above. However, what contains both specific saturated copolyester (A1) and specific saturated copolyester (A2) is preferable. Thus, it is preferable to use two types of saturated copolyesters having different melting points because the heating temperature at the time of producing the flat cable can be lowered and the heat resistance of the flat cable itself can be maintained.

  And as mentioned above, when using together saturated copolymerization polyester (A1) and saturation copolymerization polyester (A2), the weight ratio of both is A1 / A2 = 90/10-10/90 by mixing ratio. Is preferably within the range of A1 / A2 = 70/30 to 30/70. That is, when the mixing ratio of A1 exceeds 90 (the mixing ratio of A2 is less than 10), the heat resistance tends to deteriorate, and conversely, the mixing ratio of A1 is less than 10 (mixing of A2 If the ratio exceeds 90), the filling property of the core wire tends to deteriorate.

  Next, the flame retardant (B component) used together with the specific saturated copolyester (A component) is not particularly limited. For example, ethylene bispentabromodiphenyl, decabromodiphenyl oxide, hexabromobenzene, brominated bisphenol. Brominated flame retardants such as A, chlorinated flame retardants such as chlorinated paraffin, chlorinated polyethylene, perchloropentacyclodecane, phosphorous flame retardants such as phosphate ester, red phosphorus, ammonium polyphosphate, polyphosphate amide, etc. can give. These may be used alone or in combination of two or more.

  The flame retardant (component B) preferably has an average particle size of 5 μm or less, and particularly preferably has an average particle size of 2 μm or less. In other words, those having an average particle size of 5 μm or less have good dispersibility and are less likely to cause defects such as poor appearance at the time of laminating a flat cable by a fish eye when it is formed into a film, so that a sufficient flame retardant effect can be obtained. Because. The average particle diameter is a value measured using a laser diffraction particle size distribution meter.

  The blending amount of the flame retardant (component B) needs to be set within a range of 40 to 140 parts with respect to 100 parts by weight (hereinafter abbreviated as “part”) of the specific saturated copolyester (component A). Yes, preferably in the range of 60-100 parts. That is, if the blending amount of the flame retardant (component B) is less than 40 parts, the flame retardancy of UL standards cannot be satisfied, and conversely if it exceeds 140 parts, the adhesive strength decreases.

The flame retardant aid (C component) is not particularly limited, and examples thereof include antimony trioxide (Sb ₂ O ₃ ), zinc borate, aluminum hydroxide, magnesium hydroxide, and melamine. These may be used alone or in combination of two or more.

  The blending amount of the flame retardant aid (component C) is preferably in the range of 5 to 60 parts, particularly preferably in the range of 5 to 40 parts, with respect to 100 parts of the saturated copolymerized polyester (component A). is there.

  The antioxidant (D component) is not particularly limited as long as it can prevent oxidation during heating and kneading. For example, a hindered phenol antioxidant, a copper damage inhibitor, a sulfur antioxidant, etc. Is given. These may be used alone or in combination of two or more.

  The blending amount of the antioxidant (component D) is preferably in the range of 0.5 to 5 parts, particularly preferably 0.5 to 3 parts, relative to 100 parts of the saturated copolymerized polyester (component A). Within range.

  There is no limitation in particular as an aluminum coupling agent (E component) used for this invention, For example, an aluminum chelate compound etc. are mention | raise | lifted. And as said aluminum chelate compound, the alkoxyaluminum chelate type coupling agent represented, for example by following General formula (1) is preferable, and it is used individually or in combination of 2 or more types.

  Among the alkoxyaluminum chelate coupling agents represented by the general formula (1), alkyl acetoacetate aluminum diisopropylate represented by the following chemical formula (2) is preferably used.

  The blending amount of the aluminum coupling agent (component E) is preferably in the range of 0.1 to 3 parts, particularly preferably 0.5 to 1 with respect to 100 parts of the saturated copolymerized polyester (component A). Within the range of 5 parts. That is, when the blending amount of the aluminum coupling agent (E component) is less than 0.1 part, the interaction between the polymer (A component) and the filler component (B, C component) is not sufficient, and at the time of lamination There is a tendency for adhesion of the adhesive to the laminating roll to increase, and conversely, if it exceeds 3 parts, the interaction between the polymer (component A) and the filler component (components B and C) tends to be strong and the appearance tends to be poor. This is because of

  In addition to the above components A to E, the adhesive composition of the present invention is appropriately blended with fillers such as talc, clay, synthetic mica, calcium carbonate, silica, and titanium dioxide as necessary. There is no problem. In addition, the said titanium dioxide (pigment) is normally used in order to conceal the conductor wiring of a flat cable.

  The talc and synthetic mica are preferably in the form of flat particles. When flat particles are used in this way, the elastic modulus of the adhesive layer can be improved without lowering the adhesive property, and the bending durability life of the flat cable can be extended. In addition, in this invention, flat particle shape means the particle | grains of the shape which is easy to orient in plane, such as flat form, needle shape, and rod shape, when forming an adhesive bond layer.

  The flat particulate filler preferably has an aspect ratio in the range of 5 to 100.

  The total amount of the filler is preferably in the range of 5 to 60 parts, particularly preferably in the range of 5 to 40 parts, with respect to 100 parts of the saturated copolymerized polyester (component A).

  The adhesive composition of the present invention is prepared, for example, by blending the above components A to E and, if necessary, a filler, and kneading them using a kneader such as a biaxial kneader or a kneader. Can do.

  The adhesive composition of the present invention has an MFR (melt flow rate) of usually less than 9, preferably less than 5, more preferably less than 3. The MFR is a value under the conditions of a measurement temperature of 190 ° C. and a load of 0.22 N.

  Next, an insulating tape for flat cables using the adhesive composition of the present invention will be described. For example, as shown in FIG. 1, the flat cable insulating tape has an anchor coat layer 2 formed on the surface of the insulating film 1, and an adhesive made of the adhesive composition on the surface of the anchor coat layer 2. Layer 3 is formed and configured.

  The insulating film 1 serving as a 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. Polyether ether ketone (PEEK) film, polyether imide (PEI) film, polyether sulfone (PES) film, and the like. Among these, 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 in order to improve the adhesion between the insulating film 1 and the adhesive layer 3, but the anchor coat layer 2 may be omitted. There is no problem. The anchor coating agent used as the material for forming the anchor coating layer 2 is not particularly limited. For example, a two-pack type aromatic ester urethane composed of a solvent-soluble copolymer polyester and an isocyanate curing agent. System adhesives and the like.

  The insulating tape shown in FIG. 1 can be manufactured as follows, for example. That is, first, as shown in FIG. 2, the adhesive composition and the separator resin are supplied from the hoppers 4 and 5 to the extruders 6 and 7, respectively. Then, the three-layered long cylindrical body 9 is continuously formed by co-extrusion from the round die 8 with the adhesive composition sandwiched between the separator resins into a long cylindrical shape. The long cylinder 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 as shown in FIG. Further, air is blown into the inside of the long cylindrical body 9 to be expanded (this extends in the lateral direction), and the upper part of the long cylindrical body 9 is sandwiched between pinch rolls 13 and pulled up while rotating in the forward and reverse directions. (This extends in the longitudinal direction), thereby preventing uneven thickness of the long cylindrical body 9. Although not shown, a predetermined number (usually three) of ring-shaped guide plates are provided in the vicinity of the outer peripheral portion of the long cylindrical body 9 at a predetermined interval.

  Next, after winding the long cylindrical body 9 in a folded state, the long cylindrical body 9 is conveyed to the cutter 14 part, and the both sides of the long cylindrical body 9 are cut along the longitudinal direction with the cutter 14 (only one side is shown in the figure). The film 15 is continuously cut to form a film 15 which is wound around a roll 18. The 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. 5, the insulating film 1 is prepared, and an anchor coat layer (not shown) is formed on the surface by performing an anchor coat process (AC) such as a roll coat method or a gravure coat method. . Subsequently, 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 the adhesive layer 3 and the surface of the insulating film 1 were formed. An anchor coat layer (not shown) is confronted and continuously bonded, and is 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. As a result, an insulating tape having a three-layer structure in which the anchor coat layer 2 is formed on the surface of the insulating film 1 and the adhesive layer 3 is formed on the surface of the anchor coat layer 2 as shown in FIG. be able to.

  The separator resin is not particularly limited as long as it is incompatible with the adhesive composition, and examples thereof include polyethylene resin and polypropylene resin. These may be used alone or in combination of two or more. Among these, polyethylene resin is suitably used in terms of excellent peelability from the adhesive layer and low cost.

  In addition, the manufacturing method of the insulation tape for flat cables of this invention is not limited to the co-extrusion manufacturing method using the above-mentioned round die, For example, even if it produces by the T-die extrusion lamination manufacturing method using a T die, etc. There is no problem.

  In the insulating tape for flat cable of the present invention, the thickness of the adhesive layer 3 is preferably in the range of 10 to 50 μm, particularly preferably in the range of 20 to 40 μm. Moreover, the thickness of the insulating film 1 is usually in the range of 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 insulating tape for flat cables of the present invention can be used, for example, for producing 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. A flexible flat cable (FFC) can be produced by sandwiching the surfaces of 24 adhesive layers 23, laminating them using a laminate roll (heat roll), and laminating them on both sides of the conductor 25.

  Examples of the conductor 25 include a rectangular copper wire subjected to tin plating. The thickness of the conductor 25 is usually in the range of 20 to 50 μm, and the width of the conductor 25 is usually in the range of 0.3 to 1.0 mm.

  It should be noted that one of the insulating tapes 24 is usually provided with holes (not shown) at regular intervals in order to create a flat cable terminal.

  Next, examples will be described together with comparative examples. However, the present invention is not limited to these examples.

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

[Saturated copolymer polyester a]
Melting point: 111 ° C., reduced viscosity: 1.23 dl / g, acid value: 10 eq / ton, melt viscosity: 8000 Ps / 200 ° C.

[Saturated copolymer polyester b]
Saturated copolymer polyester modified with both carboxylic acid and sodium sulfonate (melting point: 134 ° C., reduced viscosity: 0.46 dl / g, acid value: 155 eq / ton, melt viscosity: 2000 Ps / 200 ° C.)

[Saturated copolymer polyester c]
Carboxylic acid-modified saturated copolymerized polyester (melting point: 138 ° C., reduced viscosity: 0.70 dl / g, acid value: 180 eq / ton, melt viscosity: 1500 Ps / 200 ° C.)

[Saturated copolymer polyester d]
Melting point: 143 ° C, reduced viscosity: 1.00 dl / g, acid value: 10 eq / ton, melt viscosity: 4600 Ps / 200 ° C

[Saturated copolymer polyester e]
Byron GA6400 manufactured by Toyobo Co., Ltd. [melting point: 86 ° C., molecular weight, 25000, acid value: 10 eq / ton, melt viscosity: 500 Ps / 200 ° C.]

[Saturated copolymer polyester f]
Byron GM470 manufactured by Toyobo Co., Ltd. [melting point: 185 ° C., molecular weight: 30000, melt viscosity: 2200 Ps / 200 ° C.]

〔Flame retardants〕
Perchloropentacyclodecane (Occidental Chemical Co., Dechlorane Plus 35) [average particle size 2 μm or less, melting point 350 ° C.]

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

〔filler〕
Calcium carbonate (Shiraishi Calcium, Silver W)

[Filler (pigment)]
Titanium dioxide (Ishihara Sangyo Co., Ltd., Taipei CR-58) [average particle size 0.2 μm]

〔Antioxidant〕
Hindered phenol-based antioxidant (Ciba Geigy, Irganox 1010)

[Coupling agent a]
Aluminum coupling agent represented by the structural formula (2) (Ajinomoto Co., Plainact AL-M, appearance: pale yellow liquid, specific gravity: 0.95 / 23 ° C.)

[Coupling agent b]
Titanium coupling agent (Ajinomoto Co., Plainact KR TTS)

[Coupling agent c]
Silane coupling agent (manufactured by Toshiba Silicone Co., Ltd., TSL8370)

[Example 1]
(Preparation of adhesive composition)
Each component shown in Table 1 to be described later was blended at a ratio shown in the same table to prepare an adhesive composition.

(Production of insulating tape)
First, a polyethylene resin was prepared as a separator resin, and a corona-treated PET film was prepared as an insulating film. Next, an anchor coating agent was applied to the surface of the PET film by a gravure coating method and dried (90 ° C. × 20 seconds) to form an anchor coating layer. And using these materials, the 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 (separator resin) are respectively supplied from a hopper to an extruder, and the cylindrical composition is sandwiched between the round die and the polyethylene resin (separator resin). By coextrusion, a three-layered long cylindrical body having a separator resin layer formed on the inner and outer peripheral surfaces of the adhesive layer was continuously formed. Then, air is blown into the inside of the long cylindrical body to be expanded (thereby extending in the lateral direction), and the upper part of the long cylindrical body is sandwiched between pinch rolls and pulled up while being rotated in the forward and reverse directions (thereby By stretching in the longitudinal direction, uneven thickness of the long cylindrical body was prevented.

  Next, after winding up this long cylinder body in a folded state, it is conveyed to a cutter part, and both sides of the long cylinder body are cut open with a cutter along the longitudinal direction, on both sides of the adhesive layer (thickness 40 μm). A film having a three-layer structure on which a separator resin layer (thickness 30 μm) was formed was continuously formed and wound on a roll.

  Thereafter, the separator resin layer on one side is peeled from the film wound up on the roll to expose the adhesive layer, and this adhesive layer and the anchor coat layer formed on the surface of the previously prepared PET film are opposed to each other. Then, they were stuck together and wound up on a roll. Next, the remaining separator resin layer is peeled off from the surface of the adhesive layer, an anchor coat layer (thickness 1 μm) is formed on the surface of the insulating film (thickness 23 μm), and the adhesive layer is further formed on the surface of the anchor coat layer. An insulating tape having a thickness of 40 μm was produced.

[Examples 2 to 18, Comparative Examples 1 to 9]
(Preparation of adhesive composition)
The components shown in Tables 1 to 4 below were blended in the proportions shown in the table to prepare an adhesive composition.

(Production of insulating tape)
An insulating tape was produced in the same manner as in Example 1 except that the above adhesive compositions were used.

  Each characteristic was evaluated according to the following criteria using the insulating tapes of the example product and the comparative example product thus obtained. These results are shown in Tables 1 to 4 below.

[MFR (melt flow rate)]
Using the adhesive composition of each insulating tape, MFR was measured using a melt indexer P-111H manufactured by Toyo Seiki Co., Ltd. under the conditions of a measurement temperature of 190 ° C. and a load of 0.22 N.

(Roll non-transferability)
In accordance with the method for measuring the adhesive force described below, the transfer amount (adhesion amount) of the adhesive to the laminate roll during lamination was visually observed to evaluate roll non-transferability. The evaluation was performed in four stages of ◎, ○, Δ, and × in order from the one with the smallest transfer amount (adhesion amount) of the adhesive to the laminate roll.

[Adhesive strength]
Two insulating tapes are prepared, and the adhesive layer side of each insulating tape is used under the conditions of a roll temperature of 170 ° C., a linear speed of 0.5 m / min, and a pressure of about 0.59 MPa using a laminate roll (heat roll). A sample having a predetermined size was prepared by laminating. Then, in accordance with JIS K 6854, a 180 ° peel test was performed under conditions of room temperature (25 ° C.) and a pulling speed of 50 mm / min, and the adhesive force (N / cm) between the insulating tapes was measured.

[Adhesive strength]
Prepare two insulation tapes, sandwich the core wire (tin-plated foil conductor) used in the actual flat cable with the adhesive layer surface of each insulation tape, and roll temperature using the laminate roll (heat roll) A flexible flat cable (FFC) having a predetermined size was manufactured by laminating under conditions of 170 ° C., a linear speed of 0.5 m / min, and a pressure of about 0.59 MPa, and then bonding to both surfaces of the core wire. Then, in accordance with JIS K 6854, a 180 ° peel test was performed under conditions of room temperature (25 ° C.) and a tensile speed of 50 mm / min, and the adhesive force (N / cm) between the core wire / insulating tape was measured.

〔appearance〕
The appearance of each insulating tape was visually evaluated. In the evaluation, “Good” indicates that there is no problem in product function.

  From the result of the said table | surface, since all the Example products had low MFR, fluidity | liquidity fell and roll non-transferability was also favorable. Further, the adhesive strength was high and the appearance was good.

  On the other hand, since all of the comparative example products had high MFR, the fluidity was high and the roll non-transferability was inferior. In particular, the product of Comparative Example 4 uses a titanium-based coupling agent, and thus has a strong interaction with the polymer at the time of compounding, resulting in deterioration of the polymer and the like. Since the product of Comparative Example 5 used a silane coupling agent, the interaction with the polymer was not sufficient at the time of compounding. Moreover, since the comparative example 6 goods have too few compounding quantities of a flame retardant, as a result of the vertical combustion test as described in VW-1 of UL specification, it was disqualified and the flame retardance was inferior. Since the comparative example 7 product has too much compounding quantity of a flame retardant, adhesive force fell. Moreover, since the product of Comparative Example 8 uses a saturated copolymerized polyester having a melting point of less than 90 ° C. alone, the adhesive flows out at the time of cable lamination, and it is difficult to process. Since the product of Comparative Example 9 uses a saturated copolyester having a melting point exceeding 180 ° C. alone, the core wire used for the cable is liable to be buried poorly.

  The adhesive composition of the present invention is suitably used as an adhesive material for insulating tape, which is a coating material for insulation protection of flat cables used in electrical equipment, electronic equipment, automobile electrical wiring, household indoor or outdoor wiring, etc. It is done.

It is sectional drawing which shows an example of the insulating tape for flat cables of this invention. It is explanatory drawing which shows the process until film-forming an adhesive composition and resin for separators. It is sectional drawing which shows the long cylinder body of the 3 layer structure by which a separator resin layer is coat-formed by the inner peripheral surface and outer peripheral surface of an adhesive bond layer. It is sectional drawing which shows the film of the 3 layer structure by which a separator resin layer is formed on both surfaces of an adhesive bond layer. It is explanatory drawing which shows the bonding process of an insulating film and an adhesive bond layer. It is a cross-sectional view which shows the flexible flat cable (FFC) using the insulating tape for flat cables of this invention.

Explanation of symbols

1 Insulating film 2 Anchor coat layer 3 Adhesive layer

Claims (9)

The following (A)-(E) component is contained, and the compounding quantity of the said (B) component exists in the range of 40-140 weight part with respect to 100 weight part of said (A) component. A feature of the adhesive composition.
(A) At least one of the following (A1) and (A2).
(A1) A saturated copolyester having a melting point of 90 ° C. or higher and lower than 130 ° C.
(A2) A saturated copolyester having a melting point of 130 ° C. or higher and 180 ° C. or lower.
(B) Flame retardant.
(C) Flame retardant aid.
(D) Antioxidant.
(E) Aluminum coupling agent.   The adhesive composition according to claim 1, wherein the amount of component (E) is in the range of 0.1 to 3 parts by weight with respect to 100 parts by weight of component (A).   The adhesive composition according to claim 1 or 2, comprising a filler.   The adhesive composition according to any one of claims 1 to 3, wherein the saturated copolymerized polyester (A2) is modified with a carboxylic acid.   The adhesive composition according to any one of claims 1 to 3, wherein the saturated copolymerized polyester (A2) is modified with both carboxylic acid and sodium sulfonate.   The adhesive composition according to any one of claims 1 to 5, wherein the acid value of the saturated copolymer polyester (A2) is in the range of 10 to 300 eq / ton.   The adhesive composition according to any one of claims 1 to 6, wherein the flame retardant of the component (B) has an average particle size of 5 µm or less.   The component (A) contains both the above (A1) and (A2), and the weight mixing ratio of both is within the range of (A1) / (A2) = 90/10 to 10/90. The adhesive composition as described in any one of 1-7.   An insulating tape for a flat cable, wherein an adhesive layer made of the adhesive composition according to any one of claims 1 to 8 is formed on one surface of an insulating tape core substrate.

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