JP2003062937A - Non-halogen fire-retardant tape and flat cable using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-halogen fire-retardant tape excellent in adhesiveness and fire retardancy. SOLUTION: The non-halogen fire-retardant tape 10 is constituted by providing a non-halogen fire-retardant adhesive layer 2 to the single surface of a non-halogen base film 11 and providing a coating layer 13 comprising non- halogen fire-retardant ink to the surface on the side opposite to the fire- retardant adhesive layer 12 of the base film 11. The excessive addition of a fire retardant for the purpose of enhancing the fire retardancy of the fire- retardant adhesive layer 12 can be suppressed by the coating layer 13 of the fire-retardant ink, and good adhesiveness and high fire retardancy are obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen-free flame-retardant tape having excellent adhesiveness and flame-retardant property, and a flat cable using the same.

[0002]

2. Description of the Related Art Among halogen-free flame-retardant tapes, there is a tape having a structure in which a halogen-free flame-retardant adhesive layer is provided on one surface of a halogen-free base film. This has an advantage that a desired flame retardancy can be obtained by simply sticking it on an object.

[0003]

However, in the case of the flame-retardant tape having this structure, if more flame retardant is added to the adhesive layer material in order to obtain higher flame retardancy, the flame retardancy itself is improved. However, there is a problem that the adhesiveness is lowered.

Further, when a flat cable is formed by using such a flame-retardant tape having reduced adhesiveness, there is a problem that the tape portion is easily peeled off.

The present invention has been made in view of the above circumstances. One of them is to provide a non-halogen flame-retardant ink on the opposite side of the non-halogen base film, in addition to the flame-retardant adhesive layer. By applying it, share the flame retardant function,
This provides a flame-retardant tape that suppresses excessive addition of a flame-retardant agent to the adhesive layer side.
It is intended to provide a flat cable using this flame-retardant tape.

[0006]

The present invention according to claim 1 provides a non-halogen flame-retardant adhesive layer on one surface of a non-halogen base film, and is opposite to the flame-retardant adhesive layer of the base film. A non-halogen flame-retardant tape having a coating layer of a non-halogen flame-retardant ink on the side surface.

The invention according to claim 2 is characterized in that the flame-retardant adhesive layer comprises 100 parts by weight of a polyester resin and 10 to 150 parts by weight of a halogen-free flame retardant. It is on non-halogen flame retardant tape.

According to the present invention of claim 3, the halogen-free flame retardant is a nitrogen-containing organic flame retardant, a phosphorus flame retardant,
The halogen-free flame-retardant tape according to claim 2, which is one or more selected from metal hydroxides.

The present invention according to claim 4 is characterized in that the flame-retardant ink is prepared by dissolving a mixture of a polyester resin and a phosphoric acid flame retardant.
It is on the non-halogen flame-retardant tape described.

The present invention according to claim 5 is the same as claim 1,
A flat cable characterized in that a conductor is sandwiched between the halogen-free flame-retardant tapes described in 2, 3, or 4.

[0011]

1 shows an embodiment of a non-halogen flame-retardant tape according to the present invention, and FIG. 2 shows an embodiment of a flat cable using this flame-retardant tape. In this flame-retardant tape 10, 11 is a base film, 12 is a non-halogen flame-retardant adhesive layer provided on one side, and 13 is a non-halogen flame-retardant flame retardant provided on the side opposite to the flame-retardant adhesive layer 12. This is an ink coating layer. Further, in the flat cable 20, 10 and 10 are flame-retardant tapes, and 21 is a plurality of conductors (single may be used).

Base film 11 of the flame-retardant tape 10
There is no particular limitation as long as it has a predetermined strength, and for example, a PET film or a PE film can be used. The thickness is about 25 μm, though it depends on the application.

The halogen-free flame-retardant adhesive layer 12
Also, although not particularly limited, for example, polyester resin 1
100 parts by weight of halogen-free flame retardant 10-1
It is preferable that the composition is formed by adding 50 parts by weight. As the polyester resin used here, for example, those having a glass transition temperature (Tg) of −20 to 10 ° C. and a molecular weight (average molecular weight) of about 5,000 to 40,000 are preferably used. Examples of the non-halogen flame retardant include nitrogen-containing organic flame retardants, phosphorus flame retardants, metal hydroxides, etc. These can be used alone or in an appropriate mixture. The thickness of the flame-retardant adhesive layer 12 also varies depending on the application, but is preferably about 35 μm.

The amount of the flame retardant added is set to 10 to 150 parts by weight. If the amount is less than 10 parts by weight, the desired flame retardancy cannot be obtained, and if it exceeds 150 parts by weight, as described above. This is because the adhesiveness is lowered and the mechanical properties are also lowered.

The coating layer 13 of the non-halogen flame-retardant ink is also not particularly limited. For example, an ink prepared by dissolving a mixture of a polyester resin and a phosphoric acid flame retardant with toluene + methyl ethyl ketone (MEK) or the like is used. Preference is given to using.

The thickness of the coating layer 13 of the flame-retardant ink can be appropriately set, but is usually 10 to 60 μm.
It is good to That is, if it is less than 10 μm, the desired effect of imparting flame retardancy cannot be obtained, and if it exceeds 60 μm, it is too thick and the mechanical properties deteriorate.

In order to manufacture the above-mentioned flat cable 20 with the flame-retardant tape 10 of the present invention having the above-described structure, a predetermined number of conductors 21 are vertically attached to the flame-retardant tape 10 which is two sheets or folded. Then, the upper and lower flame-retardant adhesive layers 12 and 12 may be bonded to each other. As a result, a flat cable having high flame retardancy and excellent adhesiveness can be obtained.

<Examples> As shown in Tables 1 and 2, a flame-retardant tape satisfying the requirements of the present invention (Examples 1 to 3) and a flame-retardant tape lacking the requirements of the present invention (Comparative Examples 1 to 4). ) Was manufactured as a sample (sample). As the base film, a PET film having a thickness of 25 μm was used. The polyester resin of the flame-retardant adhesive layer has a glass transition temperature (Tg) of 0 ° C. and a molecular weight (average molecular weight) of 20.
The thing of about 00 was used. The flame retardant used was melamine cyanurate: melamine polyphosphate = 4: 1. As the flame-retardant ink, an ink made of a mixture of a polyester resin and a phosphoric acid flame retardant was used.

Then, each of these samples was evaluated for adhesive strength, breaking load, tensile elongation and oxygen index. These evaluations are also shown in Tables 1 and 2.
Regarding the adhesive force, the adhesive layer sides of the sample tapes having a width of 10 mm are opposed to each other, and the bonding speed is 0.3 m /
Laminate at a temperature of 160 ° C. and a pressure of 0.5 MPa for 1 min.
Peeling was performed by pulling at 80 ° (in the shape of a T-shape), and the peeling force at that time was measured (T-shape peeling test). Usually, the adhesive force is required to be 0.5 Kgf / cm or more.

Regarding the breaking load and the tensile elongation, a sample tape having a width of 15 mm and a length of 200 mm was marked at the center of the sample tape at intervals of 50 mm, and was 200 mm / mi.
A tensile test was performed at a speed of n. Normally, a breaking load of 7 kgf / 15 mm or more is required, and a tensile elongation of 80% or more is required.

The oxygen index was determined by measuring the minimum oxygen concentration required for the sample sample to burn with a flame retardant oxygen index measuring device (JIS-K-7201). Normally, an oxygen index of 27 or more is required.

[0022]

[Table 1]

[0023]

[Table 2]

From Table 1 above, it can be seen that the flame-retardant tapes (Examples 1 to 3) satisfying the conditions of the present invention have good adhesive strength, breaking load, tensile elongation and oxygen index. On the other hand, from Table 2, it is understood that the flame-retardant tapes (Comparative Examples 1 to 4) lacking the requirements of the present invention have a problem in any of the characteristics. In other words, Comparative Example 1 has a low flame retardance (oxygen index) when there is no coating layer of flame retardant ink,
It was insufficient. Comparative Example 2 was inadequate because the flame retardant ink coating layer was present but the thickness was not thin (5 μm), and the flame retardancy was also low. Comparative Example 3 has a coating layer of flame-retardant ink and is too thick (70 μm).
In m), although flame retardancy was high, mechanical properties (breaking load and tensile elongation) were decreased. In Comparative Example 4, the amount of the flame retardant added to the adhesive layer (250 parts by weight) was large, and the adhesive strength was
A decrease in mechanical properties (breaking load and tensile elongation) was observed.

In the above description, the base film 1
The flame retardation of 1 itself is not particularly mentioned, but in the present invention, the base film 11 side can be flame retarded if necessary.

[0026]

As is clear from the above description, according to the flame-retardant tape of the present invention, by providing the coating layer of the flame-retardant ink, an excessive flame-retardant agent is provided for improving the flame-retardant property of the adhesive layer. Addition can be suppressed, and good adhesiveness and high flame retardancy can be obtained.

Further, according to the flat cable of the present invention, by using the flame-retardant tape, a cable having a high flame-retardant property and an excellent adhesive property can be obtained with a simple structure in which the tapes are simply pasted together.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a flame-retardant tape according to the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of the flat cable according to the present invention.

[Explanation of symbols]

10 flame-retardant tape 11 Base film 12 Flame-retardant adhesive layer 13 Flame-retardant ink coating layer 20 flat cable 21 conductor

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01B 7/08 H01B 7/08 F term (reference) 4F100 AA17B AA17H AH03B AH03H AK01A AK41B AK41C AT00A BA03 BA07 CA08B CA08C CA08H CC01C JJ07B JJ JL11B JL12B YY00B 4J004 AA15 AA17 AA18 AB03 CA04 CA06 CA07 CC03 FA05 4J040 ED001 HA136 HC00 HD21 JA09 JB01 KA36 LA08 LA09 NA19 PA23 5G311 CB01 CC01 CD03

Claims (5)

[Claims] 1. A non-halogen flame-retardant adhesive layer is provided on one surface of a non-halogen base film, and a non-halogen flame-retardant ink is applied to the surface of the base film opposite to the flame-retardant adhesive layer. A non-halogen flame-retardant tape having a layer. 2. The flame-retardant adhesive layer comprises 100 parts by weight of a polyester resin and a non-halogen flame retardant 10-150.
The non-halogen flame-retardant tape according to claim 1, wherein the non-halogen flame-retardant tape comprises 1 part by weight. 3. The non-halogen flame retardant tape according to claim 2, wherein the non-halogen flame retardant is one or more selected from nitrogen-containing organic flame retardants, phosphorus flame retardants, and metal hydroxides. . 4. The non-halogen flame-retardant tape according to claim 1, wherein the flame-retardant ink is formed by dissolving a mixture of a polyester resin and a phosphoric acid flame retardant. 5. A flat cable in which a conductor is sandwiched between the halogen-free flame-retardant tapes according to claim 1, 2, 3 or 4.