JPH09157605A - Sheet for reinforcing terminal end of tape wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reinforcing sheet which has a specific adhesive layer on one surface of the insulating base material and is used for reinforcing the ends of the tape wires in which the conductive wires are arranged in the insulating layers at a certain interval, thus shows excellent adhesion to the conductive wires not only at room temperature but also in both cold and hot atmospheres. SOLUTION: On one surface of the insulating base material, an adhesive layer comprising (A) 50-90wt.% of polyester polymer containing a polycarbonate diol as an essential polyol and (B) 50-10wt.% of a resin with a softening point of >=80 deg.C is formed. The component A preferably has a weight-average molecular weight of 40,000-120,000. The softening point of the component B is preferably >=100 deg.C, usually >=150 deg.C. The content of the components insoluble in the solvent in the adhesive layer is preferably set to 20-80wt.%. In order to reinforce the terminal ends of the tape wire with the objective sheet, the insulating layer is removed to expose the conductive wires and the sheet is allowed to adhere to the exposed part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing sheet composed of an insulating base material and an adhesive layer used for reinforcing the end portion of a tape electric wire.

[0002]

2. Description of the Related Art In recent years, multi-core cables called "tape electric wires" (or "flat cables") have come into wide use with the spread of OA equipment and the development of LANs. This type of tape electric wire has a structure in which a predetermined number (two or more) of conducting wires are arranged in parallel in an insulating layer.

When connecting the end of this tape electric wire,
The insulating layer is removed at the terminal to expose the conductive wire, and a reinforcing sheet is bonded to the exposed portion. As the reinforcing sheet, for example, those described in Japanese Utility Model Laid-Open No. 61-93936 and Japanese Patent Application Laid-Open No. 3-28312 are known.

In these reinforcing sheets, an insulating layer (polyester film) at a terminal portion of a tape electric wire and an adhesive layer for adhering to a conductor are provided on one surface of an insulating base material serving as a reinforcing layer. It has a different structure. Further, since this adhesive layer is firmly adhered to each of the insulating layer and the conductive wire, an adhesive suitable for each adherend is selected and has a structure such as streaking or double coating.

Further, the adhesive includes thermoplastic copolymer polyester resin, epoxy group-containing ethylene copolymer,
Vinyl aromatic hydrocarbon polymers, acrylic acid ester-based polymers, rubber-like substances, ethylene-based polymers and the like are recommended.

[0006]

However, in most cases, the conventional reinforcing sheets provided with these adhesive layers have insufficient adhesive strength in a room temperature atmosphere (10 to 50 ° C.). Or, even if the adhesive strength at room temperature is good,
The adhesive strength in a low temperature atmosphere (less than 10 ° C) and a high temperature atmosphere (more than 50 ° C and 80 ° C or less) was insufficient.

In view of the above circumstances, the present invention provides a reinforcing sheet composed of an insulating base material and an adhesive layer for reinforcing the end portion of a tape electric wire, which is not only a room temperature atmosphere but also a low temperature atmosphere. It is also an object of the present invention to provide a tape having excellent adhesiveness to a tape electric wire even in a high temperature atmosphere.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present inventors have conducted various studies on the material composition of the adhesive layer provided on one surface of the insulating substrate, and as a result, have found that a specific polyester and a specific resin are used. By using and in combination,
The inventors have found that a reinforcing sheet having excellent adhesiveness to a tape electric wire can be obtained not only in a normal temperature atmosphere but also in a low temperature atmosphere and a high temperature atmosphere, and have completed the present invention.

That is, the present invention provides a sheet for reinforcing the terminal portion of a tape electric wire having a structure in which conductive wires are arranged at intervals in an insulating layer, wherein A ) 50-90% by weight of a polyester polymer containing polycarbonate as an essential polyol component, and B) a softening point of 8
The present invention relates to a sheet for reinforcing an end portion of a tape electric wire, which is provided with an adhesive layer composed of 50 to 10% by weight of a resin having a temperature of 0 ° C. or higher. It is possible to provide the above-mentioned reinforcing sheet having a molecular weight of 20,000 to 200,000.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the reinforcing sheet of the present invention,
The insulating base material may be one that effectively functions as a reinforcing layer at the end portion of the tape electric wire, and for example, a plastic film having a thickness of about 50 to 350 μm or the like, or paper, A porous material such as a non-woven fabric is used.

In the reinforcing sheet of the present invention, the thickness of the adhesive layer provided on one surface of the insulating base material is usually 10 to 1
It has a thickness of about 50 μm.
Good adhesion to insulating layers and conductors that make up electric wires, especially from low-temperature atmospheres below 10 ° C to 10
In the normal temperature atmosphere of -50 ° C and the high temperature atmosphere of more than 50 ° C and 80 ° C or less, the one made of a specific adhesive described below is used as a material exhibiting good adhesive strength.

The specific adhesive is a polyester polymer containing polycarbonate as an essential polyol component as the A component, and a softening point of 80 as the B component together with the A component. It is a combination of resins having a temperature of ℃ or higher.

The polyester polymer as the component A contains a polyol component essentially containing polycarbonate, that is, 50% by weight or more, preferably 60% by weight or more of polycarbonate. A polyester having a polyol component and a polybasic acid component and having a weight average molecular weight of 20,000 to 200,000, preferably 30,000 to 150,000, and more preferably 40,000 to 120,000 is used. If the molecular weight is too low, the durability is poor, and if it is too high, the coatability of the adhesive is poor.
Not preferred.

Polycarbonate diol has the following formula: (In the formula, R is an aliphatic or alicyclic hydrocarbon group having 2 to 20 carbon atoms) and has a repeating unit represented by a commercially available product manufactured by Daicel Chemical Industries, Ltd. Product name: Praxel CD-220PL, CD-210P
L, CD-205PL, CD-220, CD-2
10 and others. As the polyol component, other than this, alkyldiol such as ethylene glycol, propylene glycol, butanediol, hexanediol, octanediol, decanediol, octadecanediol, etc. are used. To be

Examples of the polybasic acid component reacted with such a polyol component include malonic acid, succinic acid,
Methylsuccinic acid, adipic acid, sebacic acid, 1,12-
Saturated polybasic acids consisting of dicarboxylic acids such as dodecanedioic acid or their acid anhydrides, and unsaturated polybasic acids consisting of dicarboxylic acids such as fumaric acid, maleic acid, citraconic acid, itaconic acid or their acid anhydrides. An acid is mentioned.

The component B resin has a softening point of 80 ° C. or higher, preferably 90 ° C. or higher, more preferably 100 ° C. or higher, and usually 150 ° C. or lower. When the softening point is lower than 80 ° C., the creep resistance and the adhesive strength at high temperature are deteriorated, which is not preferable. The types of resin include terpene-based, rosin-based, alkylphenol-based, terpenephenol-based, rosinphenol-based, coumarone-indene-based,
Examples include aromatic petroleum-based oils and aliphatic petroleum-based oils.

In the total amount of the component A polyester polymer and the component B resin, the component A polyester polymer is 50 to 90% by weight, preferably 55 to 87% by weight, more preferably 65. The amount of the component B resin is 50 to 10% by weight, preferably 45 to 13% by weight, and more preferably 35 to 15% by weight. When the amount of the component A polyester polymer is less than 50% by weight and the amount of the component B resin exceeds 50% by weight, impact resistance at low temperature is lowered, and the amount A component polyester polymer is 90% by weight.
If the content of the component B resin is less than 10% by weight, the shear adhesive strength will decrease, and in any case, good adhesive strength can be exhibited over a wide temperature range from low temperature to normal temperature and high temperature. It gets harder.

The adhesive used in the present invention contains the polyester polymer as the component A and the resin as the component B in the above proportions, and the solvent insoluble content is preferably 10 to 90% by weight, more preferably 15 to 90% by weight. It is preferable to set it in the range of 85% by weight, more preferably 20 to 80% by weight.
If the solvent-insoluble content is too low, the durability will be poor, and if it is too high, the adhesiveness will be poor, both of which are not preferable.

In the adhesive used in the present invention, as a commonly used additive, for example, a cross-linking agent such as an epoxy compound or an isocyanate compound, a filler such as glass fiber or metal powder, a pigment, a colorant, A plasticizer or the like may be included.

The reinforcing sheet of the present invention configured as described above
In order to reinforce the end portion of the tape electric wire with the use of a cord, it may be carried out according to a conventional method. For example, in a terminal portion of a tape electric wire having a structure in which two or more conducting wires are arranged at intervals in an insulating layer, the insulating layer is removed to expose the conducting wire, and the exposed portion is used for the reinforcement described above. The terminal portion may be reinforced by adhering the sheet using the adhesive force of the adhesive layer.

[0021]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the scope of the present invention is not limited by the following examples. Hereinafter, "parts" means "parts by weight". The weight average molecular weight of the polyester polymer is a value converted into polystyrene by gel permeation chromatography.

Example 1 A reaction vessel equipped with a thermometer, a stirrer and a water separation tube was placed as a polycarbonate carbonate under the trade name "Plaxel CD-220PL" (hydroxyl value by Daicel Chemical Industries, Ltd.). 56.1 KOHmg / g) 100 parts, sebacic acid 1
0.1 part and 0.025 part of dibutyltin oxide were added, and the temperature was raised to 180 ° C. with stirring in the presence of toluene as a reaction water discharging solvent. After some time, a runoff of water was noted. By continuing the reaction for about 24 hours, a polyester polymer solution having a weight average molecular weight of 60,000 was obtained.

To this polyester polymer solution, per 100 parts of its solid content, 30 parts of a terpene phenol resin having a softening point of 115 ° C. and 2 parts of an adduct of trimethylolpropane and hexamethylene diisocyanate are added. Addition,
An adhesive solution was prepared by mixing. Next, this adhesive solution was applied to one side of a polyester film having a thickness of 188 μm so that the thickness after drying would be 50 μm, and 1
It was dried at 20 ° C. for 2 minutes to prepare a reinforcing sheet.

Example 2 An adhesive was prepared in the same manner as in Example 1 except that 20 parts of rosin phenol resin having a softening point of 145 ° C. was used instead of 30 parts of the terpene phenol resin having a softening point of 115 ° C. A solution was prepared and a reinforcing sheet was prepared using this solution.

Example 3 Coumaron-indene resin 50 having a softening point of 120 ° C. was used in place of 30 parts of a terpene phenol resin having a softening point of 115 ° C.
An adhesive solution was prepared in the same manner as in Example 1 except that parts were used, and a reinforcing sheet was prepared using this solution.

Comparative Example 1 To the solution of the polyester polymer obtained in Example 1, 2 parts of an adduct of trimethylolpropane and tolylene diisocyanate were added and mixed per 100 parts of the solid content, followed by adhesion. A drug solution was prepared. Next, using this adhesive solution, a reinforcing sheet was produced in the same manner as in Example 1.

Comparative Example 2 An adhesive was prepared in the same manner as in Example 1 except that 30 parts of a terpene phenol resin having a softening point of 50 ° C. was used instead of 30 parts of a terpene phenol resin having a softening point of 115 ° C. A solution was prepared and a reinforcing sheet was prepared using this solution.

Comparative Example 3 In a reaction vessel equipped with a cooling tube, a nitrogen introducing tube, a thermometer and a stirrer, 50 parts of ethyl acetate and 50 parts of toluene were used as solvents, and 50 parts of 2-ethylhexyl acrylate and n-butyl acrylate were used. By adding 45 parts, 4.9 parts of acrylic acid, 0.1 part of 2-hydroxyethyl acrylate, and 0.1 part of 2,2'-azobisisobutyronitrile, and polymerizing in a nitrogen gas stream, A solution of an acrylic polymer having a weight average molecular weight of 700,000 was obtained.

To this acrylic polymer solution, 30 parts of a terpene phenol resin having a softening point of 115 ° C. and 2 parts of an adduct of trimethylolpropane and hexamethylene diisocyanate are added per 100 parts of the solid content. An adhesive solution was prepared by adding and mixing. Using this solution, a reinforcing sheet was produced in the same manner as in Example 1.

For each of the reinforcing sheets of Examples 1 to 3 and Comparative Examples 1 to 3 described above, 0 ° C., 2 ° C.
In an atmosphere of 5 ° C. and 80 ° C., the adhesive force with respect to the tin-plated conductive wire forming the tape electric wire and the adhesive force with respect to the insulating layer (polyester film) were measured. Result is,
The results are shown in Table 1 below.

<Measurement of adhesive force to tin-plated lead wire> 5
0.1 mm on the adhesive layer of the reinforcing sheet of 0 mm x 200 mm
mm × 0.8 mm × 250 mm × 6 tin-plated flat rectangular conductor wires were placed thereon, and they were thermocompression bonded under the conditions of 160 ° C., 5 Kg / cm ² and 1 minute, and the force required for peeling one conductor wire was measured. This measurement was carried out in a 0 ° C., 25 ° C. (65% RH) and 80 ° C. atmosphere at a peeling rate of 100 mm / min and a peeling angle of 18 mm.
This was done under the condition of 0 degree.

<Measurement of Adhesive Strength to Insulating Layer (Polyester Film)> 0.1 mm × 70 mm × 250 mm × 1 piece of polyester film is placed on the adhesive layer of the reinforcing sheet of 50 mm × 200 mm, 160 ° C. , 5 kg / cm ² , 1 minute under heat and pressure, and then cut into 1 cm width, and the force required for peeling 1 cm width of polyester film was measured. This measurement was carried out in an atmosphere of 0 ° C., 25 ° C. (65% RH) and 80 ° C. under conditions of a peeling speed of 100 mm / min and a peeling angle of 180 °.

[0033]

As is clear from the results shown in Table 1 above, the reinforcing sheets of Examples 1 to 3 of the present invention all have the same table.
Excellent adhesion to insulating layer (polyester film) and conducting wire (tin-plating conducting wire) that compose electric wire under low temperature (0 ° C), normal temperature (25 ° C) and high temperature (80 ° C) Is shown.

[0035]

As described above, according to the present invention, by using a specific polyester and a specific resin together as an adhesive layer provided on one surface of an insulating substrate, not only a normal temperature atmosphere but also a low temperature atmosphere and a high temperature atmosphere Also in this case, it is possible to provide a reinforcing sheet having excellent adhesiveness to (the insulating layer and the conductive wire of) the tape electric wire.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuyuki Tokunaga 1-2-1, Shimohozumi, Ibaraki City, Osaka Prefecture Nitto Denko Corporation

Claims (2)

[Claims] 1. A sheet for reinforcing a terminal portion of a tape electric wire having a structure in which conducting wires are arranged at intervals in an insulating layer, the sheet comprising: A) a polycarbonate panel on one side of an insulating base material. -Tuzio-
50 to 90% by weight of a polyester-based polymer having a polyol as an essential polyol component, and B) a resin 50 having a softening point of 80 ° C. or higher.
A tape provided with an adhesive layer consisting of 10 to 10% by weight.
Sheet for reinforcing the end of the electric wire. 2. The sheet for reinforcing the end portion of a tape electric wire according to claim 1, wherein the weight average molecular weight of the polyester polymer as the component A is 20,000 to 200,000.