JPH09201913A - Laminated body for flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently and heat-resistantly cover a metal cable under the state that neither delamination occurs nor blowing develops under an elevated temperature in a flat cable. SOLUTION: In a flat cable 10, in which bonding resin layers 4 of two sets of laminated body 1 for flat cable consisting of at least a heat resistant base material 2 and the bonding resin layer 4 face each other so as to pinch a metal cable 5 between them for heat-sealing, this laminated body is produced by laminated a two-component curing type bonding acceleration layer 3 and the bonding resin layer 4 in the order named on one side of the heat resistant base material 2. Further, the bonding resin layer 4 is made of a composition, the MFR of which is prepared to be 0.3-40g/10min by adding 1-200 pts.wt. of nonflammability imparting agent to 100 pts.wt. of thermoplastic resin having the melting point of 70-200 deg.C and can heat-seal a metal. Furthermore, the bonding resin layers are mutually heat-sealable each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION Cables used in electronic devices such as electronic parts, liquid crystal display devices, mobile phones, home appliances, computers, etc. belong to a flat cable laminate excellent in flame retardancy and heat resistance.

[0002]

The adhesive resin layer used in the conventional flat cable has a low heat resistance temperature, and when it is placed in an environment of high temperature, or when it is repeatedly subjected to high temperature to low temperature, Peeling or destruction phenomenon (hereinafter referred to as delamination in the present specification) or the adhesive resin layer between the heat resistant substrate or the metal cable and the adhesive resin layer, between the adhesive resin layers or inside the adhesive resin layer. The problem is to solve problems such as foaming due to the remaining volatile components.

[0003]

In order to solve the above-mentioned problems, the present invention provides an adhesive resin of two sets of laminates which comprises at least a heat-resistant base material and an adhesive resin layer formed of a thermoplastic resin. In a flat cable in which layers are opposed to each other and heat-sealed so as to sandwich a metal cable, at least a two-component curing type adhesion promoting layer and an adhesive resin layer are laminated at least in order on one surface of a heat resistant substrate. . Then, the adhesive resin layer is blended with 1 to 200 parts by weight of a flame retardancy-imparting agent with respect to 100 parts by weight of a thermoplastic resin having a melting point of 70 to 200 ° C., and a melt flow index (in this specification, 190 ° C., 10 min at a load of 2.16 kgf
Of g is simply referred to as MFR..g. ) 0.3-40
A laminate for a flat cable, which has a composition adjusted to g / 10 min and which can be heat-sealed with a metal and has adhesive resin layers having heat-sealing properties. Also,
The thermoplastic resin constituting the adhesive resin layer has a carbonyl group based on a carboxylic acid, a carboxylic anhydride, a carboxylic acid salt, a carboxylic acid amide, or a carboxylic acid ester in a main chain or a side chain of 1 to 700 milliequivalent. / 100g
(Hereinafter, it is described as meq / 100 g in the present specification.) A laminate for a flat cable containing a resin concentration. The thermoplastic resin forming the adhesive resin layer is a laminate for a flat cable made of ethylene / acrylic acid copolymer, ionomer, polyamide, polyester, or acrylic resin. The adhesive resin layer is a flat cable laminate provided by single-layer or multi-layer melt extrusion coating.

[0004]

2. Description of the Related Art Cables used in conventional electronic equipment have been made of ordinary single or multiple wires made of metallic copper covered with an insulating material such as cross-linked polyethylene or polyvinyl chloride. However, as electronic devices have become smaller and more sophisticated in recent years, the space inside a substrate on which electronic components are mounted has become smaller, and the demand for cables with a certain direction that are difficult to meander has increased. Therefore, a metal wire having a flat cross section (hereinafter referred to as a metal cable in the present specification) is covered with a plastic laminate having excellent insulation properties and flame retardancy to save space, bend resistance and constant directionality. A flat cable with has been developed.

A plastic laminate for a flat cable is formed on a heat resistant substrate such as a biaxially stretched polyester film.
As the adhesive resin layer, a polyvinyl chloride sheet laminated by dry lamination via an adhesive, or a composition comprising a polyester resin and a flame retardant via a primer layer as necessary (adhesiveness A varnish prepared by dissolving a resin layer in a suitable solvent and drying it has been used as a flat cable molding sheet. In both of them, the metal cable is sandwiched between the adhesive resin layers facing each other, and heat sealed to cover the metal cable.

However, in the case where the polyvinyl chloride is laminated, the polyvinyl chloride, which is the adhesive resin layer, and the metal cable are not completely adhered to each other. There is a problem that an air gap is generated between them and the adhesive resin layer causes delamination due to the pressure of the air gap. Further, polyvinyl chloride having a heat-sealing property is generally inferior in heat resistance, and there is a problem that it melts at a temperature of 60 ° C. or higher and causes delamination at the bent portion of the flat cable.

The adhesive strength between a flat cable laminate formed by coating a varnish obtained by dissolving a composition comprising a polyester resin and a flame retardant in an appropriate solvent and a metal cable is comparable to that of polyvinyl chloride. However, the solvent-soluble polyester resin has poor heat resistance, and there is a problem that it melts at a temperature of 60 ° C. or higher and causes delamination at the bent portion of the flat cable. Further, the adhesive resin layer of the flat cable laminated sheet into which the metal cable is inserted and heat-sealed needs to be provided with a thickness of 1/10 or more of that of the metal cable having a thickness of 50 to 200 μm. The adhesive resin layer having a thickness of less than 1/10 has a problem that the adhesive resin layer is torn at the end portion of the metal cable during fitting as described later. Therefore, when forming the constituent composition of the adhesive resin layer from a dissolved varnish, the coating amount of the varnish becomes large, it is difficult to completely vaporize and remove the solvent, and the residual solvent is adhesive to the metal cable. Not only does it hinder the adhesion with the resin layer, but it also acts as a plasticizer over time to soften it, or it vaporizes in high temperature environments to generate bubbles, which may cause peeling from the heat resistant substrate. There was a problem of causing lamination.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a flat cable laminate 1 of the present invention comprises two sets of at least a heat resistant substrate 2 and an adhesive resin layer 4 formed of a thermoplastic resin. In the flat cable 10 in which the adhesive resin layer 4 of the laminated body faces and heat seals so as to sandwich the metal cable 5, at least 2 is provided on one surface of the heat resistant base material 2.
The liquid hardening type adhesion promoting layer 3 and the adhesive resin layer 4 are laminated at least in order. Then, the adhesive resin layer 4
Is 1 to 200 parts by weight of a flame retardant-imparting agent to 100 parts by weight of a thermoplastic resin having a melting point of 70 to 200 ° C.
A composition adjusted to 0.3 to 40 g / 10 min,
A laminate for flat cable 1 that can be heat-sealed with a metal and has adhesive resin layers having heat-sealing properties
It is. The thermoplastic resin constituting the adhesive resin layer 4 has a carbonyl group based on carboxylic acid, carboxylic acid anhydride, carboxylic acid salt, carboxylic acid amide, or carboxylic acid ester in the main chain or side chain of 1 to 700 meq. / 100
It is the laminated body 1 for flat cables containing in the density | concentration of g resin. The thermoplastic resin forming the adhesive resin layer 4 is the flat cable laminate 1 made of ethylene / acrylic acid copolymer, ionomer, polyamide, polyester, or acrylic resin. Further, it is the flat cable laminate 1 in which the adhesive resin layer 4 is formed by melt extrusion coating as a single layer or by coextrusion coating.

The heat-resistant substrate of the present invention has a melting point of the composition containing the desired additive which is higher than the melting point of the adhesive resin layer by 30 ° C. or more. It doesn't matter. For example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate,
Polyester such as polytetramethylene naphthalate,
Polypropylene, polyolefin such as ethylene / propylene copolymer, nylon 12, nylon 6, nylon 66, polyamide such as wholly aromatic polyamide, polyamide such as polyamide imide and polyether imide, tetrafluoroethylene, trifluoroethylene, polyvinylidene fluoride , Fluorinated resin such as polyvinyl fluoride,
An unstretched or stretched sheet of polyvinyl chloride, polyether sulfone, polyether ketone, polyphenylene sulfide, polyarylate, polyester ether or polycarbonate can be applied. Particularly preferred is biaxially stretched polyethylene terephthalate from the viewpoint of easy film formation, heat resistance and rigidity.

The thickness of the heat-resistant base material is determined by taking into consideration workability to endure when inserting a metal cable and performing heat sealing, rigidity required for a construction site, and price. However, those having a thickness of 15 to 100 μm are usually used. Physical and / or chemical treatment such as corona discharge treatment, plasma treatment, ozone treatment, etc. on one side of the heat resistant substrate to strengthen the adhesion between the heat resistant substrate and the adhesion promoting layer or the adhesive resin layer. It is preferable to apply the adhesion strengthening method according to. Also, on the side of the heat resistant substrate opposite to the adhesive resin layer, when a metal cable is inserted and heat-sealed, it sticks to the heating part, or static electricity is generated or foreign matter accompanying it adheres, A normal lubricant, lubricant and / or antistatic agent may be provided in order to prevent the heat-resistant base material and the adhesive resin layer from adhering to each other when wound into a length.

The adhesion promoting layer is made of polyethyleneimine, organic titanium compound, polyolefin, polybutadiene, isocyanate, polyesterurethane, polyetherurethane, etc. in consideration of adhesion compatibility and workability with heat resistant base material and adhesive resin layer. Can be selected. In particular, the flat cable may form a two-component reaction type adhesion promoting layer in which the heat resistance of the adhesive portion and the reaction that proceeds at a temperature near room temperature of 30 to 40 ° C. after lamination are polyol and the curing agent is isocyanate. It is preferable from the viewpoint of imparting heat stability.

The main component of the adhesion promoting layer is ethylene glycol, diethylene glycol, dipropylene glycol,
Polyester polyol synthesized from a diol component such as 1,4-butanediol, 1,6 hexanediol, neopentyl glycol and a dibasic component such as adipic acid, azelaic acid, sebacic acid, isophthalic acid and terephthalic acid, and their modifications Substances, polyether polyols and modified products such as polyethylene glycol, polyoxypropylene glycol, and polytetramethylene ether glycol, ethylene glycol, diethylene glycol, dipropylene glycol, 1,4-butanediol, 1,6 hexanediol, neopentyl glycol And low molecular weight polyols such as trimethylolpropane. The curing agent for the adhesion promoting layer is an isocyanate monomer such as tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tris (isocyanate phenyl), methane-tris (isocyanate phenyl) thiophosphate, or an isocyanate such as tolylene diisocyanate or hexamethylene diisocyanate. Examples thereof include urethane prepolymers obtained by adding a monomer to trimethylolpropane, hexamethylene diisocyanate burette, hexamethylene diisocyanate, and isocyanate modified products such as isophorone diisocyanate trimer.

A titanium coupling agent, a silane coupling agent, an inorganic filler or the like can be added as an auxiliary agent for strengthening and promoting the adhesion strength, heat resistant adhesion and reaction rate of the adhesion promoter.

The adhesion promoting layer can be formed by coating in either the same step as forming the adhesive resin layer on the heat resistant substrate or in another step. The coating is performed by rubber or steel roll coating, and in some cases, gravure coating, in order to perform coating uniformly and evenly. The application amount by the gravure plate can be easily regulated, but depending on the type of the adhesion promoter, a hardened insoluble matter may be deposited on the gravure cell, which may cause unevenness in the application. The coating solution is an aliphatic, aromatic hydrocarbon, alcohol,
In addition to a solution of an organic solvent such as an ester or a ketone, an aqueous dispersion is used for coating and drying. The coating amount is 0.
It is 02-2 g / m < ² > (solid content).

The flame retardant imparting agent to be blended with the thermoplastic resin is
A flame retardant effect is given to the laminate for flat cables, and the composition is selected in consideration of suitability for melt extrusion coating. For example, chlorine-based compounds such as chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenyl, perchlorpentacyclodecane, het anhydride, and chlorendo acid, and tetrabromoethane, tetrabromobisphenol A, hexabromobenzene, decabromo. Biphenyl ether, tetrabromophthalic anhydride, polydibromophenylene oxide, hexabromocyclodecane,
There are organic or inorganic compounds containing halogen elements such as ammonium bromide. Triallyl phosphate, alkyl allyl phosphate, alkyl phosphate, dimethyl phosphate, phosphonate, halogenated phosphate ester, trimethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, octyl diphenyl phosphate, tricresyl phosphate, cresyl Dilphenyl 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 (chloro Propyl)
There are phosphoric acid esters and phosphorus compounds such as monooctyl phosphate, polyphosphonate, polyphosphate, aromatic polyphosphate, and dibromoneopentyl glycol, phosphonate-type polyols, phosphate-type polyols, and halogen-containing polyols. Aluminum hydroxide, magnesium hydroxide, magnesium carbonate, antimony trioxide, antimony trichloride, zinc borate, antimony borate, boric acid, antimony molybdate, molybdenum oxide, phosphorus / nitrogen compounds, calcium /
There are metal powders and inorganic compounds such as aluminum silicate, zirconium compound, tin compound, dawsonite, calcium aluminate hydrate, copper oxide, copper metal powder, calcium carbonate and barium metaborate. In addition, there are compounds containing nitrogen such as silicone polymers, ferrocene, fumaric acid, maleic acid, triazine, isocyanurate, urea and guanidine. The flame retardancy-imparting agent in the present invention is preferably a method in which a phosphoric acid ester and an inorganic compound are used in combination.

The flame retardancy-imparting agent for the thermoplastic resin is preferably blended in an amount of 1 to 200 parts by weight based on 100 parts by weight of the thermoplastic resin by a known dry blending method or melt blending method. Then, the flame retardant imparting agent is used by combining one or more of the above-mentioned ones, and the MFR of the composition to be the adhesive resin layer is adjusted to 0.3 to 40 g suitable for melt extrusion coating. Create so that If the amount of the flame retardant-imparting agent is less than 1 part by weight based on 100 parts by weight of the thermoplastic resin, there is no effect of imparting flame retardancy, and if it exceeds 200 parts by weight, film-forming property during melt extrusion coating Not only cannot form a uniform adhesive resin layer, but even if a film is formed, the rigidity of the film is too strong to follow the bending of the metal cable. Further, the adhesive resin layer containing an excessive amount of the flame retardant imparts an obstacle to the adhesion with the heat resistant base material, which may cause a problem of delamination of the flat cable at high temperature.

The material used for the adhesive resin layer has heat sealability (heat adhesiveness) with metal cables such as copper, stainless steel, gold, silver, nickel, tin, brass and aluminum, and the adhesive resin layers are It is a thermoplastic resin with heat sealability.

The thermoplastic resin constituting the adhesive resin layer is
A carbonyl group "-(C = O)-" based on a carboxylic acid, a carboxylic anhydride, a carboxylic acid salt, a carboxylic acid ester, etc., which has a heat-sealing property with a metal, in the main chain or side chain 1
It contains ~ 700 meq / 100 g. If the carbonyl group is less than 1 meq / 100 g, the adhesion to metal is low and delamination may occur at high temperature. On the other hand, when it exceeds 700 meq / 100 g, neck-in (change in flow width of molten resin when melt-extruding from T die) becomes large during film formation, and film formation becomes difficult. The thermoplastic resin applicable to the adhesive resin layer is ethylene / methyl acrylate copolymer, ethylene /
Ethyl acrylate copolymer, ethylene / acrylic acid copolymer, ethylene / methyl methacrylate copolymer, ethylene / ethyl methacrylate copolymer, maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, acrylic acid grafted Resin composition obtained by copolymerizing polyolefin, ethylene / vinyl acetate copolymer, partially saponified ethylene / vinyl acetate copolymer with a compound having an acetoxy group, a hydroxyl group or a carbonyl group, an ionically cross-linked olefin copolymer (hereinafter referred to as ionomer). 1) of copolyester, copolyamide, etc.
It is a species or a combination of two or more species.

The composition of the adhesive resin layer has a melting point of 70 to 2
It is preferable that the temperature is 00 ° C. and the MFR is 0.3 to 40 g. If the melting point is less than 60 ° C, it can be heat-sealed with a metal cable at a relatively low temperature, but when it is rolled up and stored as a laminated body, it tends to block in a rolled-up form, which may be used in the flat cable manufacturing process. In some cases, the supply becomes impossible, and the processed flat cable is plasticized at a high temperature to be separated from the metal cable, or may cause delamination in which it breaks inside the adhesive resin layer. When the melting point is higher than 200 ° C, the heat-sealing temperature when processing a flat cable becomes high, and not only the heat-resistant temperature of the heat-resistant substrate needs to be set higher, but also the work efficiency is lowered, This causes uneven heat sealing with the cable, which causes a problem in product quality.

When the MFR of the adhesive resin layer is 0.3 g or less, the resin pressure in the molten state becomes high in the melt extrusion coating for producing the flat cable laminate,
There is a problem in processing that extrusion coating cannot be performed and thickness unevenness occurs. In addition, when the flat cable is created, the heat-sealing resin flow is poor, and high temperature and pressure are required to insert and adhere the metal cable, which reduces productivity and increases the size of the processing machine. This causes a rise in cost and product cost.

When the MFR of the adhesive resin layer exceeds 40 g, the workability of heat-sealing a flat cable into which a metal cable is inserted is good, but the melt extrusion coating for producing a laminate for a flat cable has fluidity. Bad, the neck-in becomes large and the molten resin does not become a uniform film shape, the state of the film changes with a slight change in the processing temperature, and the thickness of the extruded coating becomes uneven, This causes a processing problem that a streak-like convex portion is generated. Further, the blended flame retardant-imparting agent and filler roughen the film and deteriorate the surface appearance.

The thermoplastic resin having a poor fluidity in the composition of the adhesive resin blended has a good melt extrusion coating suitability, for example, an MFR of 3 to 8 g. Density is 0.92g / c
It is also possible to laminate the m ³ low density polyethylene by coextrusion coating so as to be in contact with the heat resistant substrate. Although not shown, the composition of the adhesive resin layer is formed by another method, for example, a casting method, a film formed by inflation or the like, and a heat resistant substrate, and an adhesion promoting layer using polyethylene or the like in a melt extruder. It is also possible to construct a laminate by sandwich sandwiching via.

The adhesive resin layer may contain polyolefin, polyester, polyamide, acrylic resin, etc., if necessary, in order to improve suitability for melt extrusion coating, workability in the flat cable production process, and blocking resistance of the laminate. It is possible to mix the above, or to appropriately add an auxiliary agent such as an inorganic compound-based additive such as silica or talc, a spherical or plate-shaped organic compound, a surfactant, an antioxidant, a plasticizer, or an ultraviolet absorber. it can. Although not shown, adhesion promotion can be achieved by selecting an adhesive resin layer having adhesiveness (heat adhesion) with a heat resistant substrate, such as a polyamide resin film and an olefin resin having a carbonyl group. It is also possible to construct a flat cable laminate in which layers are omitted.

The thickness of the adhesive resin layer can be appropriately selected depending on the thickness of the metal cable, the application, and the use environment. And
It is selected so that it can adhere to the bend of the flat cable while keeping the heat seal strength with the metal cable and follow it.
Usually, it is 0.1 to 2 times the thickness of the metal cable. When the adhesive resin layer is formed by extrusion coating, the adhesion promoting layer is formed by coating a solution of an extremely thin adhesion promoting layer, drying it, and then coating it with a thermoplastic resin that is heated and melted at a high temperature. It is possible to form a flat cable laminate that does not contain a volatile residual solvent and does not leave air bubbles between the heat resistant substrate and the adhesive resin layer.

The flat cable laminate 1 of the present invention comprises:
As shown in FIG. 2, FIG. 3, FIG. 4 and FIG. 1, it is composed of a heat resistant substrate 2, an adhesion promoting layer 3 and an adhesive resin layer 4. The two sets of flat cable laminates 1 are placed so that the adhesive resin layer 4 faces each other and the metal cable 5 is inserted therein. Then, heating from the side of the heat resistant substrate 2 by a known method,
The pressure-softened adhesive resin layer 4 and the metal cable 5 are temporarily fixed at the temporary attachment portion 6, and the metal cable 5 is positioned at a predetermined position. Further, in order to heat-seal the facing adhesive resin layers 4 to each other, the adhesive resin layer 4 is plasticized by being strongly heated and pressed so that the adhesive resin layer 4 bites into the metal cable 5 so as to cover the periphery thereof and adhere. The portion 7 is formed, the adhesive resin layer 4 is heat-sealed, and cooled and fixed. The metal cable 5 is fixed between the two sets of flat cable laminates 1. At this time, the adhesive resin layer 4 composed of the thermoplastic resin and the flame retardancy-imparting agent is
Not only does it provide a cushioning effect at the time of pressurization, but also forms a flat cable 10 that is fixed in a state in which the metal cable is covered and inserted so as to be fitted, as shown in FIG.

The fixing of the metal cable in the present invention is established by the chemical adhesion with the carbonyl group of the adhesive resin layer 4 and the physical fitting state (inserted state) with the metal cable 5. By this chemical adhesion and physical fitting, it follows the bending of the flat cable at high temperature,
Laminated body for flat cable 1 that can prevent delamination, has excellent heat resistance, and can accurately arrange metal cables
Can be configured.

[0027]

EXAMPLE As shown in FIG. 2, a heat-resistant base material 2 was a biaxially stretched polyethylene terephthalate film having a thickness of 50 μm, and an adhesion promoting layer 3 had a polyester polyol: diphenylmethane diisocyanate ratio of 4: 1 (solid content ratio). The ethyl acetate solution blended in (1) was coated at 0.5 g / m ² by rubber roll coating. Next, the adhesive resin layer 4 and the thermoplastic resin for adhesive resin layer shown in Table 1 and Table 2 are shown.
Adhesion promoting layer side provided with the above-mentioned heat-resistant substrate 2 with the compositions of Examples 1 to 12 and Comparative Examples 1 to 6 in which the flame retardancy-imparting agent shown in Table 1 is combined as shown in Table 3. 3 was melt-extruded and coated so that the adhesive resin layer 4 had a thickness of 30 μm to prepare a flat cable laminate 1 of the present invention shown in FIG. Then, as shown in FIGS.
As a surface-tin-plated copper cable having a cross section of 0.1 mm in thickness and 2 mm in width, the adhesive resin layers 4 of the two sets 1 of the flat cable laminate are confronted with each other, and as shown in FIGS. After inserting the surface tin-plated copper cable with the cable 5 at 1 mm intervals and crimping it between two rubber rolls heated to 200 ° C. at a running speed of 3 m / min, a stronger pressure is applied between the cooled metal roll and the rubber roll. The flat cable 10 shown in FIG. 1 in which the adhesive portion 7 was formed in a state in which the circumference of the metal cable was completely covered by crimping and cooling was prepared.

[0028]

[Table 1] C = 0: carbonyl group meq / 100 g (hereinafter, blank space)

[0029]

[Table 2] P *: Phosphoric acid ester-based compound, the same applies hereinafter. (Below margin)

[0030]

[Table 3]

The following evaluations were performed on the flat cables prepared for the examples and comparative examples. Storage test under high temperature (a) Adhesive strength: 80 with 12 metal cables
Peeled in the longitudinal direction of the metal cable at ℃, peeling angle 180
The peeling rate was measured at a peeling speed of 300 mm / min. (b) Evaluation of delamination: 10 flat cables
It was bent and fixed so as to be in a state of 0 mmφ, and the state of delamination after holding at 100 ° C. for 48 hours was visually evaluated. Flame-retardant test: The end of a sample having a width of 25 mm and a length of 150 mm was ignited by a flame of a gas burner, and the combustion state after removing the flame was visually evaluated. Self-extinguishing ... Immediately extinguishing Complete combustion ... Continuing combustion Workability: Visually evaluate the situation when melt-extruding and coating the adhesive resin layer and the uniformity of the formed adhesive resin layer. Table 4 shows the evaluation results. (Below margin)

[0032]

[Table 4]

Samples 1 to 12 of the examples showed sufficient adhesive strength even at high temperature, and neither bubbles nor delamination were observed. Further, it has excellent flame retardancy and does not hinder workability. In Comparative Example 1, since the melting point of the adhesive resin layer was less than 70 ° C. (60 ° C.), bubbles and delamination were generated at high temperature. In Comparative Example 2, since the MFR of the adhesive resin layer was 0.2 g, bubbles and delamination were generated at high temperature, and the workability was poor, and streak-shaped protrusions were generated. In Comparative Example 3 and Comparative Example 4, the adhesive strength with the flat cable was small, and bubbles and delamination were generated at high temperature. In Comparative Example 5, the amount of the flame retardancy-imparting agent was not sufficient, and the composition had flammability. In Comparative Example 6, the amount of the flame retardancy-imparting agent was excessive, the processability was poor, and streaky convex portions were generated.

[0034]

The fixing of the metal cable by the flat cable laminate of the present invention is not limited to the chemical bonding between the metal and the carbonyl group of the adhesive resin layer, but also between the adhesive resin layer 4 and the metal cable 5. Physical mating state (inserted state)
Is established together with. By this chemical adhesion and physical fitting, it is possible to follow the bending of the flat cable at high temperature, prevent delamination, have excellent heat resistance, and construct a flat cable laminate that can accurately arrange metal cables. is there. In addition, the adhesive resin layer formed by melt extrusion coating is a laminated body for a flat cable that has no residual solvent of the adhesive, air bubbles caused by air remaining between the heat-resistant base material and the middle, and delamination. The effect of being able to provide.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a cross section of a flat cable formed of a flat cable laminate of the present invention.

FIG. 2 is a conceptual diagram of a cross section of a flat cable laminate of the present invention.

FIG. 3 is a conceptual diagram of a cross section showing a state in which a metal cable is placed.

FIG. 4 is a conceptual diagram of a cross section showing a state in which a metal cable is temporarily attached.

[Explanation of symbols]

 1 Flat Cable Laminate 2 Heat Resistant Base Material 3 Adhesion Promoting Layer 4 Adhesive Resin Layer 5 Metal Cable 6 Temporary Attachment with Metal Cable 7 Adhesion with Metal Cable 10 Flat Cable

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Claims (4)

[Claims] 1. A flat cable in which at least two adhesive resin layers of a laminated body composed of a heat-resistant base material and an adhesive resin layer formed of a thermoplastic resin face each other so as to sandwich a metal cable and are heat-sealed. In the above, at least a two-component curable adhesion promoting layer and an adhesive resin layer are laminated on at least one surface of a heat-resistant substrate, and the adhesive resin layer has a melting point of 70 to 200 ° C. 1 to 200 parts by weight of a flame retardant additive is mixed with 100 parts by weight to obtain a melt flow index of 0.3 to 40 g / 10 mi.
A laminate for a flat cable, which has a composition adjusted to n, can be heat-sealed with a metal, and has adhesive resin layers having heat-sealing properties. 2. The thermoplastic resin constituting the adhesive resin layer is a carboxylic acid, a carboxylic acid anhydride, a carboxylic acid salt,
A carbonyl group based on a carboxylic acid amide or a carboxylic acid ester is contained in a main chain or a side chain at a concentration of 1 to 700 milliequivalent / 100 g resin.
The laminate for a flat cable described. 3. The laminate for a flat cable according to claim 1, wherein the thermoplastic resin forming the adhesive resin layer is made of ethylene / acrylic acid copolymer, ionomer, polyamide, polyester, or acrylic resin. 4. The flat cable laminate according to claim 1, 2 or 3, wherein the adhesive resin layer is provided by melt extrusion coating of a single layer or multiple layers.