JPH09167523A - Extra-thin, diameter multi-core cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extra-thin diameter, multi-core cable with its superior self-fusion property in handling to be used electronic equipment, medical equipment products, etc. SOLUTION: This cable can be obtained by means of inter-wire fusion processing due to heating process after plural extra-thin insulation electric wires of which resin composition sharing methacrylate monomer having isocyanate group at the end in urethane-acrylate ultraviolet-ray hardened resin composition and methacrylate monomer having hydroxy group at its end is coated with an insulation thickness of 50μm or less are stranded on a metal wire of 100μm or less in conductor diameter. In addition, urethane acrylate ultraviolet-ray hardened resin composition in which the ratio of isocyanate group and hydroxy group of said resin composition ranges from 5/1 to 1/1 is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-small diameter multi-core cable used for electronic equipment, medical equipment products, etc.
The present invention relates to a novel ultra-thin multi-core cable that is self-fusing and has improved diameter, terminal treatment, identification, and handleability.

[0002]

2. Description of the Related Art In recent years, communication devices and precision electronic devices have been miniaturized and mounted at high density, and in order to transmit more information signals, it is necessary to use insulated wires whose conductors are cable cores having a reduced diameter. A small-diameter multi-core cable that combines multiple cables is used. In particular, in the field of medicine, it has been attempted to introduce a sensor into a living body using a catheter prior to an operation and collect information on the inside of the living body from a detection signal of the sensor. In order to obtain much information, it is required to miniaturize the sensor and to reduce the diameter and density of the lead wire used for the sensor.

The diameter of the insulated wire can be reduced by reducing the diameter of the conductor and the thickness of the surface coating. As a method of forming a thin surface coating, there is a method of applying a liquid material to a conductor and curing it, as represented by the production of enameled wire.

There are various types of liquid materials such as thermosetting type, ultraviolet curing type, and electron beam curing type. Among them, the ultraviolet curing type resin composition is a solventless liquid state, and it is easy to form a thin coating and has a curing rate. A coating of any thickness can be obtained quickly and by one or several coatings. This UV-curable resin composition has higher safety than a thermosetting varnish that uses a solvent, and has excellent terminal processability at the time of connection. Furthermore, a colorless and transparent resin composition can easily be colored. Therefore, there is an advantage that it is easy to identify the electric wire.

As another method, there is known a method of forming a thin coating by extrusion based on a thermoplastic resin such as a polyolefin resin or a fluorine resin.

[0006]

In the above-mentioned conventional coating forming method, when the coating is thinned and used, a method of applying a liquid material to a conductor like an enamel wire and curing the same by baking is used. Since the peelability is poor and the liquid material is difficult to be colored, there is a problem that the distinguishability is poor. In addition, in the forming method by extrusion of thermoplastic resin, the load on the conductor becomes large at the time of extrusion, so if the pressure of the coating material and the drawing speed of the conductor cannot be controlled appropriately, the conductor will be disconnected, the appearance will be rough, and the coating will not occur. Due to problems such as non-uniform thickness, the manufacturing technology is difficult, which is a factor that prevents the diameter reduction.

On the other hand, when inserting an ultra-multicore cable in which a plurality of extra-fine diameter insulated electric wires are twisted into a cylindrical tube or spiral tube, the twisting alone causes the insertion at the time of insertion, and the insertion cannot be done. However, there is a problem that the electrical characteristics in the liquid become unstable when they are dispersed in the tube. In addition, after twisting, an outer layer coat may be applied to prevent loosening, but it takes a lot of time and effort to take out each of the twisted insulated wires with an outer diameter of several tens of microns. There was a problem.

In the field of enameled wire, as a method of imparting self-bonding property, there is a self-bonding enameled wire in which copolymer nylon or a modified product thereof is dissolved in a solvent and the surface is thinly coated, but a solvent is used. Therefore, there is a problem in that it requires large-scale equipment such as solvent recovery and is not preferable for applications involving living organisms.

On the other hand, the ultraviolet curable coating material is easy to be solvent-free and has great advantages in terms of safety and production. However, UV curable coatings generally form a three-dimensional cross-linked product during curing, as with thermosetting varnish for enameled wires, and do not fuse with heat after curing. There is a problem that you cannot wear it.

The present invention has been made in view of the above circumstances, and solves the above-mentioned drawbacks of the prior art,
An object of the present invention is to provide an ultra-thin diameter multicore cable having excellent self-bonding property, which is excellent in handleability and used in medical device products and the like.

[0011]

The present invention is directed to a resin composition in which a urethane acrylate-based ultraviolet curable resin composition is used in combination with a (meth) acrylate monomer having an isocyanate group and a (meth) acrylate monomer having a hydroxy group at the end. On a metal wire with a conductor diameter of 100 μm or less,
It is an ultra-thin diameter multi-core cable obtained by twisting a plurality of ultrafine insulated electric wires coated with an insulation thickness of 50 μm or less and then performing a fusion treatment between wires by a heat treatment. Further, it is an ultra-thin multi-core cable characterized by using a urethane acrylate-based ultraviolet curable resin composition in which the ratio of isocyanate groups to hydroxy groups of the resin composition is in the range of 5/1 to 1/1.

As a result of various studies conducted by the present inventors on the UV curable resin composition, the urethane acrylate UV curable resin composition has a (meth) acrylate monomer having an isocyanate group at the terminal and a hydroxy group at the terminal. Using a (meth) acrylate monomer in combination, a self-fusing resin composition in which the ratio of the isocyanate group and the hydroxy group is in the range of 5/1 to 1/1,
After twisting a plurality of ultra-fine insulated electric wires coated with an insulation thickness of 50 μm or less on a metal wire with a conductor diameter of 100 μm or less, heat treatment is performed to fuse the wires to reduce the diameter,
It is possible to manufacture ultra-thin multi-core cables that are easy to handle, easy to handle, and easy to identify.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The urethane (meth) acrylate monomer-based UV crosslinking resin composition used in the present invention is
A resin composition comprising a urethane (meth) acrylate oligomer as a main component and other components such as a photopolymerizable monomer and a photopolymerization initiator, wherein the urethane (meth) acrylate oligomer is a diisocyanate, a polyol and a hydroxyalkyl (meth) acrylate. It is not particularly limited as long as it is manufactured from.

The photopolymerizable monomer is an acryloyl group,
A known reactive diluent having a functional group having an unsaturated double bond such as a methacroyl group, an allyl group and a vinyl group can be used. Desirably, it is effective for low temperature solderability to use a monofunctional monomer whose functional group is a metacroyl group.

The photopolymerization initiator is not particularly limited, and known photoinitiators may be used. For example, there are acetophenone-based, benzoin-based, benzophenone-based, thioxanthone-based, and the like. As the acetophenone type, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 2
-Methyl-1- [4- (methylthio) phenyl] -2-
Morpholinopropane-1 and the like, and examples of the benzophenone type include benzoin, benzoin methyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and benzyl dimethyl ketal. Examples of the benzophenone type include benzophenone, methyl benzoylbenzoate, 3.3′-dimethyl-4-methoxybenzophenone, and the like, and thioxanthone type 2.4.
-Diethylthioxanthone, 2.4-dichlorothioxanthone and the like.

Having an isocyanate group at the terminal (meth)
The acrylate monomer is not particularly limited, and may be a (meth) acrylate monomer having at least one isocyanate group. For example,
2-Isocyanate (meth) acrylate is mentioned as a typical monomer.

The (meth) acrylate monomer having a hydroxy group at the terminal may be any (meth) acrylate monomer having at least one hydroxy group. For example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate,
Examples include glycidol di (meth) acrylate.

When ultrafine insulated wires coated with the urethane acrylate-based UV-curable resin composition that uses them in combination are stacked and heated at a certain temperature or higher, isocyanate groups and hydroxy groups react between the surfaces of the ultrafine insulated wires to cause a line. The spaces can be bonded.

In the present invention, the ratio of the isocyanate group to the hydroxy group is set in the range of 5/1 to 1/1 because the urethane group and the allophanate bond in the urethane (meth) acrylate oligomer are higher when the ratio of the isocyanate group is higher. This is because it is possible to improve the adhesion between the wires of the ultrafine insulated wire.

The proportion of the monomer having an isocyanate group and the monomer having a hydroxy group in the urethane acrylate-based UV-curable resin composition is not particularly limited, but is preferably in the range of 1% by weight to 30% by weight. If it is less than 1% by weight, it is difficult to obtain self-bonding property, and 30% by weight
If it is more, there is a problem that the curability is lowered. further,
It is preferably in the range of 5% by weight to 20% by weight.

The metal constituting the conductor may be any of copper, aluminum, iron, silver, platinum, etc., and alloys thereof.
They may be alloys with tin, zinc, etc. Further, those plated with tin, silver, nickel or the like may be used. The metal conductor may be a single wire, or a stranded wire or a stranded wire further plated. Alternatively, a rectangular metal conductor may be used.

In addition, if necessary, a photoinitiator aid, an adhesion preventive agent, a thixotropic agent, a filler, a plasticizer, a non-reactive polymer, a colorant, a flame retardant, a flame retardant aid, an anti-softening agent, a mold release agent. Agent,
Drying agent, dispersing agent, wetting agent, anti-settling agent, thickening agent, antistatic agent, antistatic agent, antifungal agent, anti-mouse agent, anti-termite agent, matting agent, anti-blocking agent, anti-skin agent Other various inorganic compounds and organic compounds can be used in combination.

The use of the ultraviolet curable resin composition as the coating material for the extra-fine insulated wire is that thin wires can be easily distinguished from each other by thin coating or coloring, and in addition, compared with the enameled wire that is baked with a thermosetting varnish, it can be processed by a terminal treatment. This is because it has an advantage of excellent property (peelability). Moreover, you may use ultraviolet-ray and thermosetting resin composition for this resin composition. The UV and thermosetting combined resin composition may be a combination of a thermal polymerization initiator having a function of initiating a polymerization reaction by heat in addition to the above composition, and in the present invention, this is not particularly limited. Absent.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings together with comparative examples.

[Example 1] Urethane methacrylate oligomer U-1
22M [Shin-Nakamura Chemical Co., Ltd.] 100 parts by weight, phenoxydiethylene glycol methacrylate [Shin-Nakamura Chemical Co., Ltd.] 50 parts by weight, 2-isocyanate ethyl methacrylate (Dow Chemical) 7 parts by weight, 2-hydroxyethyl methacrylate [ Kyoeisha Yushi Co., Ltd.] 5 parts by weight and a photopolymerization initiator 2,2-dimethoxy-2-phenylacetophenone (manufactured by Ciba-Geigy) 5 parts by weight, an ultraviolet curable resin composition, conductor diameter 25 ± shown in FIG.
After coating the wire 1 of 1 μm (silver-plated copper alloy wire) and curing it through an ultraviolet irradiation furnace, an ultrafine insulated electric wire 3 having a self-bonding ultraviolet curable resin layer 2 with an insulation thickness of 10 ± 1 μm is obtained, As shown in FIG. 2, two pieces of this were twisted and fused through a heating furnace to obtain an ultra-small diameter multi-core cable 4 and used as a sample.

[0025]

[Example 2] Urethane methacrylate oligomer U-1
22M [Shin-Nakamura Chemical Co., Ltd.] 100 parts by weight, phenoxydiethylene glycol methacrylate [Shin-Nakamura Chemical Co., Ltd.] 50 parts by weight, 2-isocyanate ethyl methacrylate (Dow Chemical) 18 parts by weight, 2-hydroxypropyl methacrylate [ Osaka Organic Co., Ltd.] 5
2,2-dimethoxy-2-part by weight and photopolymerization initiator
An ultraviolet ray curing resin composition consisting of 5 parts by weight of phenylacetophenone (manufactured by Ciba Geigy) was coated on a wire 1 having a conductor diameter of 25 ± 1 μm (silver plated copper alloy wire) as in the case shown in FIG. Cured through, insulation thickness 10
After obtaining an ultrafine insulated electric wire 4 having a self-bonding UV-curable resin layer 2 of ± 1 μm, 7 pieces of this are twisted and fused through a heating furnace as shown in FIG. A sample was obtained.

[0026]

[Comparative Example 1] Urethane methacrylate oligomer U-1
22M [Shin-Nakamura Chemical Co., Ltd.] 100 parts by weight, phenoxydiethylene glycol methacrylate [Shin-Nakamura Chemical Co., Ltd.] 60 parts by weight, and photopolymerization initiator 2,2-dimethoxy-2-phenylacetophenone (Ciba Geigy) 5 An ultraviolet curable resin composition consisting of parts by weight is coated on the element wire 1 having a conductor diameter of 25 ± 1 μm (silver plated copper alloy wire) as in the case shown in FIG. After obtaining an ultrafine insulated electric wire 3 having a self-fusing UV-curable resin layer 2 of ± 1 μm, two ultrafine insulated electric wires 3 are twisted as shown in FIG. A sample was obtained.

[0027]

[Comparative Example 2] Urethane methacrylate oligomer U-1
22M [Shin-Nakamura Chemical Co., Ltd.] 100 parts by weight, phenoxydiethylene glycol methacrylate [Shin-Nakamura Chemical Co., Ltd.] 60 parts by weight, 2-isocyanate ethyl methacrylate (manufactured by Dow Chemical) 5 parts by weight, and 2 of a photopolymerization initiator , 2-dimethoxy-2-phenylacetophenone (manufactured by Ciba-Geigy) was used to prepare an ultraviolet curable resin composition in the same manner as that shown in FIG.
m (silver-plated copper alloy wire) is coated on the element wire 1 and cured through an ultraviolet irradiation furnace to obtain an ultrafine insulated electric wire 3 having a self-bonding ultraviolet curable resin layer 2 with an insulation thickness of 10 ± 1 μm. Similar to the one shown in FIG. 3, seven pieces were twisted and fused through a heating furnace to obtain an ultra-small diameter multi-core cable 5, which was used as a sample.

Table 1 shows the evaluation results of the ultra-thin multicore cables of Examples 1 and 2 and Comparative Examples 1 and 2.

[0029]

[Table 1]

In this table, the self-bonding evaluation method is as follows.
mm, mandrel diameter 20 mm, length 50 mm, wrapped around aluminum bobbin so that the wires come into contact with each other, and this insulated wire is treated by electric heating for 10 minutes at a temperature of about 150 ° C. Adhesion was observed and evaluated. Also, a 200 μm-thick sheet of an ultraviolet curable resin composition was prepared, and two sheets having a width of 20 mm and a length of 100 mm were stacked, sandwiched between aluminum metal plates, and a load of 500 g was placed, and the temperature was 150 ° C. for 30 minutes. After the heat treatment, the adhesive force was measured by Tensilon.

As is clear from Table 1, the insulated wires of Example 1 and Example 2 in which a monomer having an isocyanate group and a hydroxy group at the ends were used together were capable of self-bonding. Further, it can be seen that, when the sheets are laminated, the higher the isocyanate group ratio, the higher the adhesive strength. On the other hand, each of the ultrafine insulated electric wires of Comparative Example 1 and Comparative Example 2 had no self-bonding property and had no adhesive force even when the sheets were attached.

In the above table, the method of evaluating the insertability in the tube is as follows. The produced ultra-thin multi-core cable has an inner diameter of 0.12 mm (samples of Examples 1 and Comparative Example 1) and an inner diameter of 0.2 mm. The insertability was evaluated using a polyethylene tube of 18 mm (samples of Example 2 and Comparative Example 2).

The ultra-small diameter multi-core cable of the present invention is constructed and used as shown in FIGS. 2 and 3, and FIG.
Plastic or metal tube 6 as shown in
Used by inserting into. In the case of this example, the insertability of the ultra-small diameter multi-core cable becomes extremely important.

[0034]

As described above, the ultra-thin multi-core cable of the present invention comprises the urethane acrylate-based UV-curable resin composition in which a monomer having a terminal isocyanate group and a hydroxy group is used in combination on a wire having a conductor diameter of 50 μm or less. It is excellent in insertability, electrical characteristics, handleability, terminal processability, and distinctiveness by twisting multiple ultra-fine insulated wires with a coating with an insulation thickness of 50 μm or less and fusing them through a heating furnace on the outer layer. It is possible to obtain an ultra-fine diameter multi-core cable, and it is extremely significant to meet today's demands.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the configuration of an embodiment of an ultrafine insulated wire of the present invention,

FIG. 2 is a cross-sectional view showing the configuration of an embodiment of an ultra-thin diameter multi-core cable of the present invention,

FIG. 3 is a cross-sectional view showing the configuration of another embodiment of the ultra-thin diameter multi-core cable of the present invention,

FIG. 4 is a cross-sectional view showing the configuration of an embodiment in which the ultra-small diameter multi-core cable of the present invention is inserted into a tube.

[Explanation of symbols]

 1 Self-fusing UV curable resin layer 2 Conductor 3 Extra-fine insulated wire 4 Ultra-thin multi-core cable 5 Ultra-thin multi-core cable 6 Plastic plastic or metal tube

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H01B 11/00 4232-5L H01B 11/00 B

Claims (2)

[Claims] 1. A resin composition comprising a urethane acrylate-based ultraviolet curable resin composition in which a (meth) acrylate monomer having an isocyanate group at the terminal and a (meth) acrylate monomer having a hydroxyl group at the terminal are used in combination with a conductor diameter of 100 μm or less. After twisting a plurality of ultra-fine insulated wires coated with an insulation thickness of 50 μm or less on the metal wire of
An ultra-thin diameter multi-core cable, which is obtained by a fusion treatment between wires by a heat treatment. 2. A urethane acrylate-based UV curable resin composition having a ratio of isocyanate groups to hydroxy groups in the range of 5/1 to 1/1 in the resin composition is used. Small diameter multi-core cable.