JP5277766B2 - Insulating film and flat cable having the same - Google Patents

Description

  The present invention relates to an insulating film that covers both surfaces of a conductor and a flat cable including the same.

  Conventionally, for example, as an internal wiring material of an electronic device such as an in-vehicle car navigation system or an audio device, both surfaces of a plurality of flat conductors are made of a resin film such as polyethylene terephthalate, and an adhesive layer formed on the resin film, The flat cable of the structure coat | covered with the insulating film which consists of is used.

  Also, in general, when manufacturing a flat cable, both sides of a conductor are sandwiched between insulating films, and heat and pressure treatment is performed using a known thermal laminator or a hot press device, whereby the conductor is bonded to the adhesive layer of the insulating film. Thus, a method of continuously laminating and bonding the both surfaces of the conductor with an insulating film is adopted.

Here, in general, in order to improve the flame retardancy of the flat cable, a flame retardant layer containing a flame retardancy imparting agent is provided. More specifically, for example, a resin film, an anchor coat layer provided on the surface of the resin film, a flame retardant layer provided on the surface of the anchor coat layer, and an adhesive provided on the surface of the flame retardant layer The flat cable which coat | covered both surfaces of the conductor with the insulating film provided with a layer is disclosed. And as a flame retardant layer, what has a resin composition which consists of a thermoplastic resin and a thermoplastic elastomer as a main component, and contains a flame retardance imparting agent is used (for example, refer patent document 1).
JP-A-9-201914

  However, in the flat cable provided with the flame retardant layer described in Patent Document 1, since the flame retardant layer is mainly composed of a thermoplastic elastomer, both the slidability and the flame retardant property of the flame retardant layer are compatible. There was a problem that became difficult. More specifically, when a thermoplastic elastomer is used, the bending elastic modulus of the thermoplastic elastomer is small and soft, so that when the flat cable is connected to the sliding portion in the electronic device, the sliding portion operates. There is a problem that the resistance to the accompanying bending motion (that is, slidability) is poor, and the conductor is easily disconnected at the sliding bent portion of the flat cable.

  Then, this invention is made | formed in view of the above-mentioned problem, and it aims at providing the insulating film excellent in slidability and a flame retardance, and a flat cable provided with the same.

  In order to achieve the above object, the invention described in claim 1 is an insulating film in which a resin film, an anchor coat layer, a first adhesive layer, a flame retardant layer, and a second adhesive layer are laminated in this order. The flame retardant layer is composed of a resin composition containing, as a main component, a polypropylene resin having a flexural modulus of 900 to 2900 MPa measured according to JIS K7171, and further containing a flame retardant imparting agent. 60 parts by weight or more and 240 parts by weight or less are included with respect to 100 parts by weight of the polypropylene resin.

  According to this configuration, since the slidability and flame retardancy of the flame retardant layer are improved, the slidability is excellent, and the flame retardant property can pass the UL standard vertical combustion test (VW-1 test). It is possible to provide an insulating film excellent in the above.

A second aspect of the present invention is the insulating film according to the first aspect, wherein the first and second adhesive layers are mainly composed of an acid-modified polyolefin resin.
According to this configuration, since the first and second adhesive layers do not contain a resin that easily absorbs water or hydrolyzes, the first and second adhesive layers are excellent in water resistance and moist heat resistance. Insulating film can be provided.

Invention of Claim 3 is the insulating film of Claim 2, Comprising: The melt flow rate of the said acid-modified polyolefin resin measured on condition of load 2.16kgf and temperature 230 degreeC based on JISK7210 Is 1.3 g / 10 min to 9.2 g / 10 min.
According to this configuration, it becomes possible to improve the laminate processability and film processability of the first and second adhesive layers.

  Invention of Claim 4 is an insulating film of any one of Claim 1 thru | or 3, Comprising: The 1st and 2nd adhesive bond layer and a flame-resistant layer are melt extrusion methods. After being formed as a laminate, the laminate is laminated on the surface of the anchor coat layer by a dry laminating method.

  According to this configuration, it is possible to reduce the thermal shrinkage of the first and second adhesive layers when dry laminating. Therefore, the occurrence of curled deformation in the insulating film can be prevented. As a result, the workability of the insulating film is improved, and when the conductor is sandwiched between two insulating films and subjected to heat and pressure treatment, both sides of the conductor are laminated and covered with the insulating film. It is possible to satisfactorily laminate both sides of the conductor.

  The invention according to claim 5 is a flat cable comprising the insulating film according to any one of claims 1 to 4 and a conductor, wherein the conductor is covered with the insulating film. It is. According to this configuration, since the insulating film according to any one of claims 1 to 4 is provided, the same effect as the invention according to any one of claims 1 to 4 is obtained. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, in the flat cable which coat | covered both surfaces of the conductor with the insulating film, the insulating film excellent in slidability and a flame retardance, and a flat cable provided with the same can be provided.

  Hereinafter, a preferred embodiment of the present invention will be described. FIG. 1 is a schematic diagram illustrating a configuration of a flat cable according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIGS. 1 and 2, the flat cable 1 in this embodiment has a structure in which both surfaces of a plurality of flat conductors 2 having a predetermined width and thickness are covered with an insulating film 3. The insulating film 3 is formed by laminating a resin film 5, an anchor coat layer 7, a first adhesive layer 4, a flame retardant layer 8, and a second adhesive layer 9 in this order. The cable 1 has a configuration in which the two insulating films 3 are bonded together with a plurality of conductors 2 sandwiched between the two insulating films 3.

  Further, as shown in FIG. 3, at the end portion (hereinafter referred to as “cable end portion”) 1a of the flat cable 1, a conductor 2 is connected to a printed circuit board, an electric / electronic component or the like (not shown). In order to connect to the conductor 2, a part of the conductor 2 is exposed to the outside without forming the insulating film 3.

  As a manufacturing method of the flat cable 1, first, both sides of the conductor 2 are sandwiched between the insulating films 3, and heat and pressure treatment is performed using a known thermal laminator or a hot press device, whereby the conductor 2 is bonded to the second adhesive. A long product in which both sides of the conductor 2 are covered with the insulating film 3 is manufactured by laminating continuously with the layer 9. At this time, in order to provide an exposed portion in which a part of the conductor 2 is exposed to the outside without forming the insulating film 3 at the cable end 1a, a hole is formed in one insulating film 3 by punching. The flat cable 1 is manufactured by laminating the insulating film 3 with the conductor 2 while forming and then cutting the long product into a certain length.

  The conductor 2 is made of a conductive metal foil such as copper foil, tin-plated annealed copper foil, or nickel-plated annealed copper thin. The thickness of the conductor 2 corresponds to the amount of current used, but the slidability of the flat cable 1 is considered. Then, 20 micrometers-50 micrometers are preferable.

  The resin film 5 is made of a resin material having excellent flexibility. For example, any resin film made of a polyester resin, a polyphenylene sulfide resin, a polyimide resin, or the like and having versatility for a flat cable can be used. It is. Polyester resins include polyethylene terephthalate resin, polyethylene naphthalate resin, polybutylene terephthalate resin, polybutylene naphthalate resin, polytrimethylene terephthalate resin, polytrimethylene naphthalate resin, polycyclohexane dimethyl terephthalate resin, polycyclohexane dimethyl naphthalate poly Examples include arylate resin.

  Of these resin films, a resin film 5 made of polyethylene terephthalate resin is preferably used from the viewpoint of electrical characteristics, mechanical characteristics, cost, and the like. In addition, by using a resin film 5 made of polyimide resin, it has heat aging resistance of 105 ° C or higher that meets UL (Underwriters Laboratories Inc.) standards, and it can be used for mounting electronic components with solder that does not contain lead. Can be provided. In the present embodiment, a resin film having a thickness of 12 μm to 50 μm can be suitably used.

  As the first and second adhesive layers 4 and 9, those mainly composed of a resin material having excellent heat and moisture resistance are used, and in this embodiment, those mainly composed of an acid-modified polyolefin resin are used. Is done. In general, when an adhesive layer containing a saturated copolyester resin that is susceptible to water absorption or hydrolysis is used, there is a problem that the water resistance of the adhesive layer is poor and the heat and moisture resistance is reduced. Insulation excellent in water resistance and moisture and heat resistance of the first and second adhesive layers 4 and 9 by using a resin composition comprising an acid-modified polyolefin resin as a main component as in this embodiment. The film 3 can be provided.

  Examples of the acid-modified polyolefin resin include acid-modified polypropylene resin and acid-modified polyethylene resin. In the present embodiment, the first and second adhesive layers 4 and 9 having a thickness of 3 μm to 15 μm can be suitably used.

  As the acid-modified polypropylene resin, those excellent in heat resistance and adhesive strength with the conductor 2 are used, and examples thereof include maleic anhydride-modified polypropylene resin, acrylic acid-modified polypropylene resin, and itaconic acid-modified polypropylene resin. In addition, what modified | denatured polypropylene resin with other functional groups, such as an epoxy group, a hydroxyl group, a carboxyl group, an amino group, can also be used. Moreover, it is preferable that melting | fusing point of acid-modified polypropylene resin is 105 to 155 degreeC from a viewpoint of improving heat resistance and the adhesive strength with a conductor.

  In addition, it is preferable to use an acid-modified polyolefin resin having a melt flow rate (MFR) of 1.3 g / 10 min to 9.2 g / 10 min. This is because if the melt flow rate is less than 1.3 g / 10 min, the melt viscosity becomes high and it is difficult to flow even when melted in the lamination process with the conductor, so that it does not adhere to the conductor 2, the conductor 2 is not embedded, On the other hand, inconvenience that wrinkles enter may occur. On the other hand, if it exceeds 9.2 g / 10 min, the melt viscosity becomes low, and the inconvenience may occur that the adhesive flows out during lamination with the conductor. It is. In addition, when an acid-modified polyolefin resin having a melt flow rate (MFR) of 1.3 g / 10 min to 9.2 g / 10 min is used to form a film-like laminate by melt extrusion, a uniform thickness is obtained. Therefore, the film processability is improved. That is, by using such an acid-modified polyolefin resin, it is possible to improve the conductor laminate processability and film processability of the first and second adhesive layers 4 and 9. The “melt flow rate” here is measured under the conditions of a measurement temperature of 230 ° C. and a load of 2.16 kgf in accordance with JIS K 7210.

  The anchor coat layer 7 is used to improve the adhesion between the resin film 5 and the first adhesive layer 4. The anchor coat layer 7 is not particularly limited when the first adhesive layer 4 is subjected to corona treatment. For example, a room temperature curing resin in which an isocyanate curing agent is mixed with a polyurethane resin as a main component. A urethane-based anchor coat layer using an anchor coat agent mainly composed of the composition can be used. In the present embodiment, the anchor coat layer 7 having a thickness of 0.5 μm to 5 μm can be suitably used.

  As the flame retardant layer 8, a material mainly composed of a resin material having flame retardancy and excellent slidability is used. In the present embodiment, a resin composition made of a polypropylene resin having a high flexural modulus. What consists of a resin composition which contains a thing as a main component and contains a flame retardant imparting agent is used. More specifically, the main component is a resin composition made of a polypropylene resin having a flexural modulus measured in accordance with JIS K7171 of 900 to 2900 MPa. This is because if the flexural modulus is less than 900 MPa, the flame retardant layer becomes soft, so that the slidability of the entire flat cable 1 may not be sufficiently improved. This is because the layer becomes too hard, which may cause inconvenience of buckling.

  Moreover, in this embodiment, it is set as the structure which makes the flame-resistant layer 8 contain the flame retardant which is a flame retardant, and provides the flame retardance which passes the vertical flame test (VW-1 test) of UL specification. . Examples of the flame retardant include chlorinated flame retardants such as chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenyl, perchlorpentacyclodecane, ethylene bispentabromodiphenyl, tetrabromoethane, tetrabromobisphenol A, hexa Halogen flame retardants such as brominated flame retardants such as bromobenzene, decabromobiphenyl ether, tetrabromophthalic anhydride, polydibromophenylene oxide, hexabromocyclodecane, and ammonium bromide. Also, for example, triallyl phosphate, alkyl allyl phosphate, alkyl phosphate, dimethyl phosphate, phosphophosphate, halogenated phosphate ester, trimethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, octyl diphenyl phosphate, Tricresyl phosphate, cresyl phenyl phosphate, triphenyl phosphate, tris (chloroethyl) phosphate, tris (2-chloropropyl) phosphate, tris (2,3-dichloropropyl) phosphate, tris (2,3-dibromopropyl) phosphate , Tris (bromochloropropyl) phosphate, bis (2,3 dibromopropyl) 2,3 dichloropropyl phosphate , Bis (chloropropyl) monooctyl phosphate, polyphosphonate, polyphosphate, aromatic polyphosphate, phosphate ester or phosphorus compound such as dibromoneopentyl glycol, phosphonate-type polyol, phosphate-type polyol, polyol containing halogen element, etc. Is mentioned. Aluminum hydroxide, magnesium hydroxide, magnesium carbonate, antimony trioxide, antimony trichloride, zinc borate, antimony borate, boric acid, antimony molybdate, molybdenum oxide, phosphorus / nitrogen compounds, calcium / aluminum silicate, zirconium Compounds, tin compounds, dawsonite, calcium aluminate hydrate, copper oxide, metal copper powder, calcium carbonate, barium metaborate, and other metal powders and inorganic compounds, silicone polymers, ferrocene, fumaric acid, maleic acid, and melamine shear Examples thereof include nitrogen compounds such as nurate, triazine, isocyanurate, urea, and guanidine.

  In addition, as a flame retardant contained in the flame retardant layer 8, it is preferable to use a halogen flame retardant such as the above brominated flame retardant or a chlorine flame retardant, and a brominated flame retardant or a chlorine flame retardant. A flame retardant may be used alone, or a bromine flame retardant and a chlorine flame retardant may be mixed and used.

  Moreover, in this embodiment, it is set as the structure which mix | blends the flame retardant adjuvant which is a flame retardant imparting agent with the flame retardant layer 8 from a viewpoint of improving the flame retardance of the flat cable 1 further, and the said flame retardant assistance. As the agent, it is preferable to use antimony trioxide.

  In the present embodiment, the flame retardant layer 8 includes 60 parts by weight of the flame retardant imparting agent composed of a flame retardant and a flame retardant aid with respect to 100 parts by weight of the resin composition composed of the above-described polypropylene resin. The content is 240 parts by weight or less. If the content of the flame retardant imparting agent is less than 60 parts by weight, the flame retardancy of the entire flat cable 1 may not be sufficiently improved, and the content of the flame retardant imparting agent may be insufficient. This is because the film processability of the flame retardant layer 8 may be reduced when the amount is more than 240 parts by weight.

In this embodiment, it becomes possible to provide the flat cable 1 excellent in slidability and flame retardance by using such a flame retardant layer 8.
Further, when the insulating film 3 is manufactured, the first and second adhesive layers 4 and 9 and the flame retardant layer 8 are formed into a film as a three-layer laminate by melt extrusion, and then dry laminated. This film-like laminate is provided on the surface of the anchor coat layer 7 by the method. More specifically, a resin composition in which a flame retardant imparting agent comprising a flame retardant and a flame retardant aid is blended with the polypropylene resin constituting the flame retardant layer 8 is a biaxial mixer, a three roll, or the like. Kneading with a kneader. Next, the kneaded resin composition and the resin composition comprising the acid-modified polyolefin resin forming the first and second adhesive layers 4 and 9 are melt-extruded by a T-die method, an inflation method, or the like. Extruding at the same time, the first and second adhesive layers 4 and 9 and the flame retardant layer 8 are formed into a film as a laminate. Then, after applying the above-mentioned anchor coat agent on the surface of the resin film 5 to form the anchor coat layer 7, the first and second adhesive layers 4, 9 and A method of dry laminating a laminate composed of three layers of the flame retardant layer 8 with the resin film 5 can be employed. By such a method, it becomes possible to reduce the thermal shrinkage of the first and second adhesive layers 4 and 9 when laminating, so that the occurrence of curled deformation in the insulating film 3 can be prevented.

According to the present embodiment described above, the following effects can be obtained.
(1) In this embodiment, the flame retardant layer 8 is mainly composed of a polypropylene resin having a flexural modulus of 900 to 2900 MPa measured according to JIS K7171, and further comprises a flame retardant and a flame retardant aid. It is set as the structure which consists of a resin composition containing a flame retardant imparting agent. And the flame retardant layer 8 contains a flame retardant imparting agent comprising a flame retardant and a flame retardant aid in an amount of 60 parts by weight or more and 150 parts by weight or less with respect to 100 parts by weight of the resin composition comprising a polypropylene resin. Yes. Therefore, since the slidability and flame retardancy of the flame retardant layer 8 are improved, the slidability is excellent, and the UL standard vertical combustion test (VW-1 test) can be passed. The insulating film 3 can be provided.

  (2) In the present embodiment, the first and second adhesive layers 4 and 9 have an acid-modified polyolefin resin as a main component. Therefore, it is possible to provide the insulating film 3 having excellent water resistance and moisture and heat resistance of the first and second adhesive layers 4 and 9.

  (3) In this embodiment, the acid-modified polyolefin resin forming the first and second adhesive layers 4 and 9 was measured under the conditions of a load of 2.16 kgf and a temperature of 230 ° C. according to JIS K7210. The melt flow rate is 1.3 g / 10 min to 9.2 g / 10 min. Therefore, it becomes possible to improve the laminate processability and film processability of the first and second adhesive layers 4 and 9.

  (4) In this embodiment, the first and second adhesive layers 4 and 9 and the flame retardant layer 8 are formed as a three-layer laminate by melt extrusion, and the laminate is formed by dry lamination. The structure is provided on the surface of the anchor coat layer 7. Therefore, when laminating, it becomes possible to reduce the thermal shrinkage of the first and second adhesive layers 4 and 9, so that the occurrence of curled deformation in the insulating film 3 can be prevented. As a result, the workability of the insulating film 3 is improved, and when the conductor 2 is sandwiched between the two insulating films 3 and heated and pressurized, both surfaces of the conductor 2 are laminated with the insulating film 3 and covered. In addition, both sides of the conductor 2 can be satisfactorily laminated by the insulating film 3.

The above embodiment may be modified as follows.
As shown in FIG. 4 (BB sectional view of FIG. 1), in the cable end 1a, the surface of the exposed portion of the conductor 2 at the cable end 1a in order to increase the connection reliability between the conductor 2 and the connection terminal. It is good also as a structure which coat | covers with the plating layer 6. FIG.

In this case, it is preferable to use a plating layer 6 that does not contain lead in consideration of the environment, and plating that does not contain lead from the viewpoint of preventing a decrease in connection reliability between the conductor 2 and the connection terminal. It is preferable to use a gold plating layer as the layer 6. The plating process on the surface of the conductor 2 is performed by an electroless plating method or an electrolytic plating method. When a gold plating layer is provided, first, nickel plating as a diffusion preventing layer is applied to the exposed conductor surface. After forming the layer, a method of forming a gold plating layer on the surface of the nickel plating layer is employed. With such a configuration, when the conductor 2 is connected to a connection terminal provided on a printed circuit board or an electric / electronic component, a decrease in connection reliability between the conductor 2 and the connection terminal can be effectively prevented. .
In addition, an antioxidant, a colorant (for example, titanium oxide), a hiding agent, a hydrolysis inhibitor, a lubricant, a processing stabilizer, a plasticizer, a foaming agent, etc. are applied to the first and second adhesive layers 4 and 9. A known compounding agent may be added. Moreover, mixing of these compounding agents can be performed by the method of melt-mixing using a single screw mixer, a twin screw mixer, etc., when making it into a film by a melt molding method.

  Below, this invention is demonstrated based on an Example and a comparative example. In addition, this invention is not limited to these Examples, These Examples can be changed and changed based on the meaning of this invention, and they are excluded from the scope of the present invention. is not.

Example 1
(Production of flame retardant resin composition)
First, 100 parts by weight of a polypropylene resin (manufactured by Nippon Polypro Co., Ltd., trade name: Novatec PP FL03H, flexural modulus: 1600 MPa), 60 parts by weight of a flame retardant (trade name: SAITEX 8010, manufactured by Almavert Co., Ltd.) and 35 weights The flame retardant resin composition was prepared by adding antimony trioxide as a part of flame retardant aid and mixing uniformly using a biaxial mixer.

(Preparation of insulation film)
Next, the prepared flame-retardant resin composition and maleic anhydride-modified polypropylene resin that forms the first and second adhesive layers 4 and 9 [trade name Modic AP P604V, melt flow, manufactured by Mitsubishi Chemical Corporation] The resin composition having a rate of 3.2 g / 10 min] was simultaneously extruded by a T-die, and the first and second adhesive layers (thickness 0.005 mm) and the flame retardant layer (thickness 0.025 mm) Were formed into a film (thickness: 0.035 mm) as a laminate. Next, 100 parts by weight of a polyurethane resin (Mitsui Chemical Polyurethane Co., Ltd., trade name Takelac A-310) and 5 parts by weight of an isocyanate curing agent [Mitsui Chemical Polyurethanes Co., Ltd., trade name Takenate A-3] An anchor coating agent prepared by dissolving a resin composition mixed with ethyl acetate as a solvent is prepared, and the above anchor is formed on the surface of a resin film made of polyethylene terephthalate (manufactured by Teijin DuPont Films Co., Ltd., thickness 0.025 mm). After the coating agent was applied, the solvent was removed by drying to form an anchor coat layer (thickness 0.003 mm) on the surface of the resin film. Next, the above-mentioned film-like laminate was laminated on the surface of the anchor coat layer by a dry lamination method. More specifically, the surface of the first adhesive layer 4 is subjected to corona treatment, and heat and pressure treatment is performed using a hot roll heated to 80 ° C., so that the surface of the anchor coat layer is formed. A film-like insulating film having a total thickness of 0.063 mm was prepared by laminating a laminate composed of three layers of the first and second adhesive layers 4 and 9 and the flame retardant layer 8. .

(Flat cable production)
Next, ten tin-plated annealed copper foils (thickness 0.035 mm, width 1.0 mm), which are conductors, are arranged in parallel, and the tin-plated annealed copper foil is sandwiched between the two produced insulating films. A flat cable was manufactured by laminating and covering both surfaces of a tin-plated annealed copper foil with an insulating film by performing a heat and pressure treatment using a thermal laminator heated to ° C., and processing into a cable shape.

(Slidability evaluation)
Subsequently, the produced flat cable was subjected to a slidability test using a sliding tester (trade name SEK-31B4S manufactured by Shin-Etsu Engineering Co., Ltd.). More specifically, the flat cable 1 is fixed to the fixing members 10 and 11 and bent as shown in FIG. 5 under the conditions of a sliding radius of 5.0 mm, a sliding speed of 700 times / min, and a sliding stroke of 250 mm. In this state, the flat cable 1 was repeatedly reciprocated in the longitudinal direction X and slid. And the case where it was able to slide 2 million times or more by making one reciprocating sliding in the longitudinal direction X as 1 time was set as the pass. The results are shown in Table 1.

(Moisture and heat resistance evaluation)
Next, the heat and humidity resistance of the produced flat cable was evaluated. More specifically, after the produced flat cable is left in a constant temperature and humidity chamber set at a temperature of 85 ° C. and a humidity of 85% for 1000 hours, the flat cable is taken out of the constant temperature and humidity chamber, and the flat cable is connected. The exposed conductor at the end was peeled by 90 ° at a speed of 100 mm / min, and the conductor adhesive strength [g / mm] was measured. In addition, the measurement of the conductor adhesive force was performed using a tensile tester [manufactured by INSTRON, trade name INSTRON MODEL4301]. Moreover, the thing with a conductor adhesive force larger than 100 g / mm was set as the pass. The results are shown in Table 1.

(Flame retardance evaluation)
Next, a vertical combustion test defined by VW-1 of UL standard 1581 was performed on the produced flat cable. More specifically, 10 flat cables are prepared for each, and after ignition, one or more of the 10 burned, burnt fallen absorbent cotton disposed below the flat cable as a sample, or The kraft paper attached to the upper part of the flat cable as the sample burned, and the others were rejected. The results are shown in Table 1.

(Example 2)
Instead of the polypropylene resin [Nippon Polypro Corp., trade name Novatec PP FL03H, flexural modulus 1600 MPa] used in Example 1, polypropylene resin [Nippon Polypro Corp., trade name Novatec PP FG4FA, flexural modulus] 900 MPa] was used in the same manner as in Example 1 described above to produce a flame retardant resin composition, an insulating film, and a flat cable. Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

(Example 3)
Instead of the polypropylene resin used in Example 1 [manufactured by Nippon Polypro Co., Ltd., trade name: Novatec PP FL03H, flexural modulus 1600 MPa], polypropylene resin [trade name: Novatec PP FL6H, produced by Nippon Polypro Co., Ltd., flexural modulus] 2900 MPa] was used in the same manner as in Example 1 above, to produce a flame retardant resin composition, an insulating film, and a flat cable. Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

Example 4
Instead of the maleic anhydride-modified polypropylene resin [Mitsubishi Chemical Corporation, trade name Modic AP P604V, melt flow rate 3.2 g / 10 min] used in Example 1, a maleic anhydride-modified polypropylene resin [Mitsubishi Chemical Corporation ), Product name Modic APP502, melt flow rate 1.3 g / 10 min] was used in the same manner as in Example 1 above to produce a flame retardant resin composition, an insulating film, and a flat cable. did. Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

(Example 5)
Instead of the maleic anhydride-modified polypropylene resin [Mitsubishi Chemical Corporation, trade name Modic AP P604V, melt flow rate 3.2 g / 10 min] used in Example 1, a maleic anhydride-modified polypropylene resin [Mitsui Chemicals, Inc. ), Product name Admer QE840, melt flow rate 9.2 g / 10 min] was used in the same manner as in Example 1 above to produce a flame-retardant resin composition, an insulating film, and a flat cable. . Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

(Example 6)
Flame retardancy was carried out in the same manner as in Example 1 except that 40 parts by weight of a flame retardant (trade name SAITEX 8010, manufactured by Almavert Co., Ltd.) and 20 parts by weight of antimony trioxide as a flame retardant aid were used. Resin composition, insulating film, and flat cable were produced. Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

(Example 7)
A flame retardant was carried out in the same manner as in Example 1 except that 160 parts by weight of a flame retardant (trade name SAITEX 8010 manufactured by Alma Vale Co., Ltd.) and 80 parts by weight of antimony trioxide as a flame retardant aid were used. Resin composition, insulating film, and flat cable were produced. Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

(Comparative Example 1)
Instead of the polypropylene resin [Nippon Polypro Corp., trade name Novatec PP FL03H, flexural modulus 1600 MPa] used in Example 1, polypropylene resin [Nippon Polypro Corp., trade name Novatec PP FX4E, flexural modulus] 650 MPa], and instead of the maleic anhydride-modified polypropylene resin used in Example 1 (Mitsubishi Chemical Corporation, trade name Modic APP P604V, melt flow rate 3.2 g / 10 min) A flame retardant resin composition, insulation, in the same manner as in Example 1 except that a modified polyethylene resin [trade name Admer NE827, melt flow rate 5.7 g / 10 min, manufactured by Mitsui Chemicals, Inc.] was used. A film and a flat cable were produced. Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

(Comparative Example 2)
Instead of the polypropylene resin used in Example 1 [manufactured by Nippon Polypro Co., Ltd., trade name Novatec PP FL03H, flexural modulus 1600 MPa], thermoplastic polyester resin [manufactured by Toyobo Co., Ltd., trade name Byron GM400, flexural modulus 1800 MPa], instead of the maleic anhydride-modified polypropylene resin used in Example 1 (trade name Modic AP P604V, melt flow rate 3.2 g / 10 min, manufactured by Mitsubishi Chemical Corporation), a thermoplastic polyester resin Except for using [Toyobo Co., Ltd., trade name Byron GM990, melt flow rate 17 g / 10 min], in the same manner as in Example 1 above, the flame retardant resin composition, insulating film, and flat cable were used. Produced. Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

(Comparative Example 3)
A flame retardant was carried out in the same manner as in Example 1 except that 30 parts by weight of a flame retardant [trade name SAITEX 8010 manufactured by Alma Beer Co., Ltd.] and 15 parts by weight of antimony trioxide as a flame retardant aid were used. Resin composition, insulating film, and flat cable were produced. Next, under the same conditions as in Example 1 described above, slidability evaluation, wet heat resistance evaluation, and flame retardancy evaluation were performed. The results are shown in Table 1.

表１に示すように、実施例１〜７のフラットケーブルは、いずれの場合においても、摺動性、耐湿熱性、および難燃性に優れていることが判る。一方、表１に示すように、比較例１のフラットケーブルは、摺動性に劣ることが判る。これは、比較例１のフラットケーブルにおいては、難燃層を構成する樹脂組成物に、曲げ弾性率の低い（６５０ＭＰａ）ポリプロピレン樹脂が含有されているためであると考えられる。また、比較例２のフラットケーブルは、耐湿熱性に劣ることが判る。これは、接着剤層を構成する樹脂組成物が、吸水や加水分解が起こり易いポリエステル樹脂を含有しているためであると考えられる。また、比較例３のフラットケーブルは、難燃性に劣ることが判る。これは、難燃層が、難燃付与剤をポリプロピレン樹脂からなる樹脂組成物の１００重量部に対して、６０重量部未満（即ち、４５重量部）しか含有していないためであると考えられる。

As shown in Table 1, it can be seen that the flat cables of Examples 1 to 7 are excellent in slidability, moisture and heat resistance, and flame retardancy in any case. On the other hand, as shown in Table 1, it can be seen that the flat cable of Comparative Example 1 is inferior in slidability. This is considered to be because in the flat cable of Comparative Example 1, the resin composition constituting the flame retardant layer contains a polypropylene resin having a low flexural modulus (650 MPa). Moreover, it turns out that the flat cable of the comparative example 2 is inferior to heat-and-moisture resistance. This is presumably because the resin composition constituting the adhesive layer contains a polyester resin that is susceptible to water absorption and hydrolysis. Moreover, it turns out that the flat cable of the comparative example 3 is inferior to a flame retardance. This is considered to be because the flame retardant layer contains less than 60 parts by weight (that is, 45 parts by weight) of the flame retardant imparting agent with respect to 100 parts by weight of the resin composition made of polypropylene resin. .

  Examples of utilization of the present invention include an insulating film that covers both sides of a conductor, and a flat cable including the same.

It is the schematic which shows the structure of the flat cable which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is BB sectional drawing of FIG. 1, Comprising: It is the schematic which shows the structure of the modification of the flat cable which concerns on embodiment of this invention. It is a figure for demonstrating the state of a flat cable at the time of performing slidability evaluation in an Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Flat cable, 1a ... Cable edge part, 2 ... Conductor, 3 ... Insulating film, 4 ... 1st adhesive layer, 5 ... Resin film, 6 ... Plating layer, 7 ... Anchor coat layer, 8 ... Flame retardant layer 9 ... second adhesive layer

Claims (5)

An insulating film in which a resin film, an anchor coat layer, a first adhesive layer, a flame retardant layer, and a second adhesive layer are laminated in this order,
The flame retardant layer is composed of a resin composition containing, as a main component, a polypropylene resin having a flexural modulus of 900 to 2900 MPa measured according to JIS K7171, and further containing a flame retardant imparting agent. 60 parts by weight or more and 240 parts by weight or less based on 100 parts by weight of the polypropylene resin.   The insulating film according to claim 1, wherein the first and second adhesive layers are mainly composed of an acid-modified polyolefin resin.   The melt flow rate of the acid-modified polyolefin resin measured under conditions of a load of 2.16 kgf and a temperature of 230 ° C in accordance with JIS K7210 is 1.3 g / 10 min to 9.2 g / 10 min. 2. The insulating film according to 2.   After the first and second adhesive layers and the flame retardant layer are formed as a laminate by a melt extrusion method, the laminate is laminated on the surface of the anchor coat layer by a dry laminate method. The insulating film according to any one of claims 1 to 3, characterized in that:   A flat cable comprising the insulating film according to any one of claims 1 to 4 and a conductor, wherein the conductor is covered with the insulating film.

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