JPH10130608A - Flame-retardant hot-melt adhesive composition and insulating tape obtained by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flame-retardant hot-melt adhesive compsn. which is low in cost and excellent in adhesive properties, processibility, and flame retardance by using an olefin resin as the base polymer and by incorporating a specific flame retardant into the same. SOLUTION: This compsn. is prepd. by compounding 100 pts.wt. polyolefin resin comprising 30-95wt.% maleic-anhydride-grafted linear low-density polyethylene having a melt index of 0.3-30g/10min and a density of 0.900-0.930g/cm<3> and 70-5wt.% maleic-anhydrige-grafted ultralow-density polyethylene having a melt index of 0.3-30g/10min and a density of 0.870-0.900g/cm<3> with 30-80 pts.wt. flame retardant comprising at least either ethylenebispentabromodiphenyl or decabromodiphenyl oxide and 5-40 pts.wt. auxiliary flame retardant comprising antimony trioxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt type flame-retardant adhesive composition used as a material for forming an adhesive layer or the like of an insulating tape and an insulating tape obtained by using the same.

[0002]

2. Description of the Related Art In general, an insulating tape is used as a constituent material of an electric wiring portion of electric, electronic equipment, automobiles or the like, or a flat electric wire such as indoor and outdoor wiring at home for covering and insulating the electric wire. . For example, as shown in FIG. 2, such an insulating tape has an adhesive layer 21 on a polymer film 23 such as polyester which is a base material of the insulating tape via an anchor coat layer 22 made of an anchor coat agent. The structure is provided, and the adhesion between the polymer film 23 and the adhesive layer 21 is enhanced by the anchor coat layer 22 made of the anchor coating agent. When it becomes necessary to impart flame retardancy to the insulating tape, a flame retardant is usually added to the adhesive layer 21.

As the adhesive layer 21 of the insulating tape,
Various adhesives such as a thermosetting polyester, a thermoplastic polyester, and a polyolefin are used. In recent years, polyolefin-based adhesives, which have the advantage of being the least expensive, although slightly less adhesive than polyester-based adhesives, have been awarded prizes. When it is necessary to impart flame retardancy to the insulating tape using the polyolefin adhesive for the adhesive layer 21, a flame retardant such as perchlorocyclopentadecane is blended with the polyolefin adhesive. You.

[0004]

However, in the compounding system of the above-mentioned conventional polyolefin adhesive and perchlorocyclopentadecane, when the adhesive film is extruded by using a T-die extruder, it is often called an eye. Resin residue frequently occurs at the tip of the T-die extruder, which falls off in a short time and adheres to the extruded adhesive film, which is disadvantageous in that long-term stable production is inferior. In addition, although the above-mentioned perchlorocyclopentadecane is excellent in flame retardancy, it has a disadvantage of high cost.

[0005] Therefore, it is conceivable to use, for example, tetrabromobisphenol A, ethylenebispentabromodiphenyl, decabromodiphenyl oxide or the like as a relatively inexpensive flame retardant. However, when any of the flame retardants is used in combination with a polyolefin-based adhesive, new problems such as a decrease in adhesiveness and a significant decrease in workability occur.

When an insulating tape is produced using the above-mentioned polyolefin-based adhesive, an extrusion laminating method of extruding the above-mentioned polyolefin-based adhesive onto the polymer film 23 and molding the same is generally employed. I have. However, the insulating tape manufactured by such an extrusion lamination method or the like, after the polyolefin-based adhesive is laminated with the polymer film 23 in a high temperature state,
When cooled to room temperature, the polyolefin adhesive layer 2
A so-called curling phenomenon occurs in which the insulating tape is curled with 1 inside. This is because the coefficient of thermal expansion of the polyolefin-based adhesive is generally one order of magnitude larger than the coefficient of thermal expansion of the polymer film 23, and thus the contraction force of the polyolefin-based adhesive layer 21 is larger than that of the polymer film 23. Because. Therefore, if an attempt is made to manufacture a flat cable using the curled insulating tape, there arises a problem that workability is poor and productivity is reduced.

Therefore, as a method of alleviating the curl phenomenon of the insulating tape, the polyolefin-based adhesive layer 2 is used.
1 is sufficiently thinner than the thickness of the polymer film 23 or the polyolefin-based adhesive layer 21
To reduce the volume shrinkage force of the polyolefin-based adhesive layer 21. However, reducing the thickness of the polyolefin adhesive layer 21 is not practical because there is a limit in performance when used as a flat cable. In addition, the reason why the polyolefin-based adhesive layer 21 is made flexible is that when a flat cable is bent and used, a buckling phenomenon occurs and the electrical insulation property is significantly reduced.

The present invention has been made in view of such circumstances, and has a low cost, excellent adhesiveness and workability,
Moreover, an object of the present invention is to provide a hot-melt type flame-retardant adhesive composition having excellent flame retardancy and an insulating tape which can reduce curling and is excellent in buckling resistance.

[0009]

In order to achieve the above-mentioned object, the present invention provides a hot melt comprising the following component (A) as a base polymer and the following components (B) and (C): The first aspect is a flame-retardant adhesive composition. (A) A polyolefin resin comprising at least one of the following (A ₁ ) and (A ₂ ). (A ₁ ) Maleic anhydride graft-modified linear low density polyethylene. (A ₂ ) Maleic anhydride graft-modified ultra low density polyethylene. (B) A flame retardant comprising at least one of the following (B ₁ ) and (B ₂ ). (B ₁ ) ethylenebispentabromodiphenyl. (B ₂ ) decabromodiphenyl oxide. (C) Antimony trioxide.

[0010] Further, the present invention provides an insulating material comprising an anchor coat layer formed on a polymer film surface, and an adhesive layer comprising the hot-melt type flame-retardant adhesive composition formed on the anchor coat layer. Tape is the second gist.

That is, in order to solve the above-mentioned problems, the present inventors have first studied a polyolefin resin having low cost and good adhesiveness. As a result, it was found that when the maleic anhydride-grafted linear low-density polyethylene (A ₁ ) was used as the polyolefin-based resin (component A), the cost was low and the adhesion was good. Further, a flame retardant excellent in incorporation with the above-mentioned special linear low-density polyethylene (A ₁ ) and inexpensive was repeatedly studied. As a result, the flame retardant (component B) comprising at least one of ethylenebispentabromodiphenyl (B ₁ ) and decabromodiphenyl oxide (B ₂ ) is blended with the special linear low-density polyethylene (A ₁ ). It was found that when the adhesive film was processed, the tip of the T-die extruder did not have any eye marks or the like, so that the processability was excellent and the cost was low. Further, when the special linear low-density polyethylene (A ₁ ) and the specific flame retardant (component B) are mixed with antimony trioxide (component C) as a flame retardant, the flame retardancy is reduced. Further improve. Then, the maleic anhydride graft-modified is added to a blending system of the special linear low-density polyethylene (A ₁ ), a specific flame retardant (B component), and antimony trioxide (C component) as a flame retardant auxiliary. It has been found that when ultra-low density polyethylene (A ₂ ) is blended, the adhesiveness is further improved while maintaining the above-mentioned processability and flame retardancy, and the present invention has been achieved. According to the present invention, it is possible to provide a hot-melt type flame-retardant adhesive composition which is inexpensive, excellent in adhesiveness and workability, and excellent in flame retardancy.

An insulating tape having an anchor coat layer formed on the surface of a polymer film and an adhesive layer formed of the hot-melt type flame-retardant adhesive composition formed on the anchor coat layer has a curl phenomenon. Was found to be able to relieve and to be excellent in buckling resistance.

Further, the adhesive layer comprising the hot-melt type flame-retardant adhesive composition has a tensile modulus of 8 to 20 kg.
/ Mm ² , it was found that the curling phenomenon could be further alleviated, and the buckling resistance was further improved.

[0014]

Next, embodiments of the present invention will be described in detail.

The hot-melt type flame-retardant adhesive composition of the present invention is obtained by using the special polyolefin resin (component A), the specific flame retardant (component B), and antimony trioxide (component C). Can be

The special polyolefin resin (component A) serving as the base polymer of the hot melt type flame retardant adhesive composition of the present invention is a maleic anhydride-grafted linear low-density polyethylene (A ₁ ) and maleic anhydride. It is made of at least one of acid graft-modified ultra low density polyethylene (A ₂ ). In the hot-melt type flame-retardant adhesive composition of the present invention, the above-mentioned special polyolefin-based resin (component A) is referred to as a base polymer when the special polyolefin-based resin (component A) is used as a hot-melt type flame-retardant adhesive. Occupies at least 30% by weight (hereinafter abbreviated as "%") of the entire adhesive composition.

The maleic anhydride-grafted linear low-density polyethylene [L-LDPE-MAH] (A ₁ ) in the special polyolefin resin (component A) is 190
The melt index (hereinafter abbreviated as “MI”) under a load of ° C. × 2.16 kg is preferably in the range of 0.3 to 30 g / 10 min, particularly preferably 1.0 to 20 g / min.
The range is 10 minutes. The specific linear low-density polyethylene (A ₁ ) has a density of 0.900 to 0.930.
but it is preferably in the range of from g / cm ^3, particularly preferably from 0.915~0.925g / cm ^3.

The maleic anhydride graft-modified ultra-low density polyethylene [ULDPE-MAH] (A ₂ ) in the special polyolefin resin (component A) described above was used for the M.P. I. (19
0 ° C x 2.16 kg load) is 0.3 to 30 g / 10
Min, particularly preferably from 1.0 to 2 minutes.
The range is 0 g / 10 minutes. The density of the specific ultra low density polyethylene (A ₂₎ is from 0.870 to 0.90
But it is preferably in the range of from 0 g / cm ^3, particularly preferably from 0.880~0.890g / cm ^3.

The specific linear low-density polyethylene (A)
The modification ratio of maleic anhydride in ₁ ) and the specific ultra-low-density polyethylene (A ₂ ) is preferably 0.01 to 5.0%, more preferably 0.02 to 3.0%, and still more preferably 0.1 to 3.0%. 1 to 1.0%. That is, if the modification ratio is less than 0.01%, it becomes impossible to give a sufficient adhesive force to an adherend. In addition,
When the modification ratio is 5.0%, a sufficient adhesive force can be obtained, so that it is not necessary to set the modification ratio to a value exceeding 5.0%. In addition, modifying the above-mentioned linear low-density polyethylene and ultra-low-density polyethylene with maleic anhydride is easier to modify industrially than other acid anhydrides and has excellent reactivity, and is most commonly used. Because it is

In the special polyolefin resin (component A), L-LDPE-MAH (A ₁ ) and ULD
The mixing ratio of PE-MAH (A ₂ ) is A ₁ /
It is preferable to set A ₂ = 30/70 to 95/5. That is, the mixing ratio of the A ₁ is less than 30 [mixing ratio of A ₂ exceeds 70], too increased tackiness of the adhesive surface, because unsuitable for use in some applications. Conversely, the mixing ratio of A ₁ is 95
When the mixing ratio of A ₂ is less than 5, the sufficient adhesion may not be obtained when the specific flame retardant (component B) and antimony trioxide (component C) are added. is there. In particular, the mixing ratio of A ₁ and A ₂ is preferably set so that the weight ratio is in the range of A ₁ / A ₂ = 40/60 to 60/40. That is, by setting the thickness within the above range, the curling phenomenon of the insulating tape can be further alleviated, and more excellent buckling resistance can be obtained.

The specific flame retardant (component B) comprises at least one of ethylene bispentabromodiphenyl (B ₁ ) and decabromodiphenyl oxide (B ₂ ).

The amount of the specific flame retardant (component B) is as follows:
The content is preferably set to 30 to 80 parts with respect to 100 parts by weight (hereinafter abbreviated as “parts”) of the special polyolefin resin (A component), particularly preferably 50 to 80 parts.
70 parts. That is, if the amount of the component B is less than 30 parts, the flame retardancy of the insulating tape is insufficient, and
If the amount exceeds 0 parts, the adhesiveness and the thin film workability may be reduced.

The component C, antimony trioxide (Sb
₂ O ₃ ) is used as a flame retardant aid. The amount of the antimony trioxide (component C) is 5 to 40 with respect to 100 parts of the special polyolefin resin (component A).
It is preferable to set so as to be within the range of parts, particularly preferably 15 to 35 parts. That is, if the amount of the antimony trioxide (component C) is less than 5 parts, the flame retardant (component B) must be greatly increased. This is because there is a risk of doing so.

The hot-melt type flame-retardant adhesive composition of the present invention appropriately contains various additives conventionally used in hot-melt type adhesive compositions in addition to the above-mentioned components A to C. It is possible to As the above additives, inorganic fillers such as titanium dioxide (TiO ₂ ), talc, and alumina, antioxidants, copper damage inhibitors, ultraviolet absorbers, and the like can be appropriately compounded.

The hot-melt type flame-retardant adhesive composition of the present invention comprises the special polyolefin resin (component A), the specific flame retardant (component B), the antimony trioxide (component C), It can be obtained by blending additives and the like in a predetermined ratio.

Examples of the use of the hot melt type flame retardant adhesive composition of the present invention include an insulating tape. As an insulating tape using the hot-melt type flame-retardant adhesive composition, for example, as shown in FIG. 1, an anchor coat layer 2 is formed on a polymer film 3 surface, and And an adhesive layer 1 formed of the above-mentioned hot-melt type flame-retardant adhesive composition.

The polymer film 3 serving as the base material of the insulating tape is not particularly limited. For example, a polyester (PET) film, a polyimide (PI) film, a polyethylene naphthalate (PEN) film, a polyphenylene sulfide (PPS) ) Films, polyetheretherketone (PEEK) films, polyetherimide (PEI) films, polyethersulfone (PES) films, and the like. Among them, a PET film is preferable because it has a good balance between mechanical strength, electrical insulation, heat resistance, and the like, and a PI film is particularly preferable when heat resistance and dimensional stability are required. It is. And the thickness is usually 12 to 250 μm from the viewpoint of durability, flexibility and electrical insulation.
And preferably in the range of 12 to 100 μm.

The anchor coating agent which is the material for forming the anchor coat layer 2 is not particularly limited, and may be an organic titanium compound or an ethylene-ethyl acrylate copolymer (E).
EA) whose main component is a modified silane or the like. These may be used alone or in combination of two or more. In particular, the anchor coating agent containing the above-mentioned organotitanium compound as a main component is used for the polymer film 3 and the adhesive layer 1.
It is particularly preferable in that it has an excellent adhesive force with the adhesive. Note that the above-mentioned organic titanium compound as a main component means that the above-mentioned organic titanium compound is at least 10% of the whole anchor coating agent.
%, And also includes the case where it is composed of only an organic titanium compound.

As the organic titanium compound, a tetraalkoxy titanium compound (alkyl titanate), a titanium chelate compound and the like can be used.

The above-mentioned tetraalkoxy titanium compound (alkyl titanate) refers to a compound represented by the following general formula (1).

[0031]

## STR1 ## In _{Ti (OR) 4 ... (1} ) [In formula (1), R is an alkyl group or an allyl group. ]

Specific examples of the tetraalkoxytitanium compound (alkyl titanate) include the following compounds (2) to (5). These may be used alone or in combination of two or more.

[0033]

Embedded image Tetraisopropoxytitanium: [tetraisopropyltitanate] Ti (O-iso-C ₃ H ₇ ) ₄ (2)

[0034]

Embedded image Tetra-n-butoxytitanium: [tetra-n-
Butyl titanate] _{Ti (O-n-C 4} H 9) 4 ... (3)

[0035]

Embedded image Tetrakis (2-ethylhexyloxy) titanium: [tetrakis (2-ethylhexyl) titanate] Ti [OCH ₂ CH (C ₂ H ₅ ) C ₄ H ₉ ] ₄ (4)

[0036]

Embedded image Tetrakisstearyloxytitanium: [tetrastearyl titanate] Ti (OC ₁₈ H ₃₇ ) ₄ (5)

The titanium chelate compound specifically includes the following compound (6).

[0038]

Embedded image Diisopropoxybis (acetylacetonato)
Titanium: [Titanium acetylacetonate] _{Ti (O-iso-C 3} H 7) 2 [OC (CH ₃₎ CHCOCH _{3] 2} ... (6)

As the material for forming the anchor coat layer 2,
When an anchor coating agent containing an organic titanium compound as a main component is used, since the -OR group in the molecule is dissociated by a hydrolysis reaction, a colorless, transparent and extremely thin polymer having a structure similar to titanium oxide (TiO ₂ ) It becomes a titanium oxide film. Its thickness is set in the range of 0.0005 to 10.0 μm, preferably in the range of 0.001 to 2.0 μm.

The insulating tape can be produced, for example, as follows using the hot melt type flame retardant adhesive composition and other raw materials. That is, a polyolefin resin (component A) in the form of a pellet is prepared. And the polyolefin resin (A component)
A predetermined amount of additives such as a specific flame retardant (component (B)) and antimony trioxide (component (C)) are blended into the pellets, kneaded using a twin-screw mixer, water-cooled, cut and pelletized again. On the other hand, the above-mentioned organic titanium compound is mixed with an organic solvent such as ethyl acetate, isopropyl alcohol, toluene, etc.
Prepare a ~ 5% anchor coat agent solution. The anchor coating agent solution is applied to one surface of the polymer film 3 by a commonly used roll coating method such as a gravure roll coating method or a reverse roll coating method, and the solvent is removed through a heating and drying oven to remove the polymer. An anchor coat layer 2 is formed on the film 3 surface. Then, the hot melt type flame-retardant adhesive composition previously pelletized is extrusion-laminated on the anchor coat layer 2 using a T-die extruder or the like. In this way, as shown in FIG. 1, the anchor coat layer 2 is formed on the surface of the polymer film 3, and the adhesive layer made of the hot melt type flame-retardant adhesive composition is formed on the anchor coat layer 2. Thus, an insulating tape having a three-layered structure on which an insulating film 1 is formed can be obtained.

The method of applying the anchor coating agent solution is not limited to the above-mentioned roll coating method, but may be performed by a spray coating method or the like.

The adhesive layer 1 made of the hot-melt type flame-retardant adhesive composition has a tensile modulus of 8 to 20 kg / m.
It is preferably set to be in the range of m ² , more preferably 9 to 18 kg / mm ² . That is, if the tensile modulus is less than 8 kg / mm ² , the curl phenomenon can be reduced, but the buckling resistance tends to be poor,
If it exceeds 20 kg / mm ² , the buckling resistance is excellent, but the curl phenomenon appears. The adjustment of the tensile modulus is performed by adjusting the specific linear low-density polyethylene (A
_This is performed by adjusting the mixing ratio of ₁ ) and the specific ultra-low-density polyethylene (A ₂ ). Specifically, the above A ₁
And the mixing ratio of A ₂ and A ₁ / A ₂ = 40/6 in weight ratio.
By setting to be in the range of 0 to 60/40,
The tensile modulus can be set in the range of 8 to ²⁰ kg / mm ² .

The tensile modulus of the adhesive layer 1 comprising the hot-melt type flame-retardant adhesive composition can be determined as follows. That is, the hot-melt type flame-retardant adhesive composition is formed into a sheet having a thickness of 1 mm by hot pressing, cut into a width of 10 mm and a length of 200 mm, and measured according to the method described in JIS K 7127. .

The thickness of the adhesive layer 1 made of the hot-melt type flame-retardant adhesive composition is preferably in the range of 20 to 150 μm, particularly preferably 30 to 60 μm. That is, if the thickness of the adhesive layer 1 is less than 20 μm, it is difficult to extrude the adhesive layer 1 by using a T-die.
If it exceeds 50 μm, the adhesive strength is almost saturated, and furthermore buckling is likely to occur.

Next, examples will be described together with comparative examples.

[0046]

Examples 1 to 8 First, a PET film (Tetron film type S6-31 manufactured by Teijin Limited) having a predetermined thickness was prepared, and diisopropoxybis (acetylacetonato) titanium was mixed with an organic solvent such as ethyl acetate. The mixture was mixed to prepare an anchor coating agent solution. Then, the anchor coating agent solution was applied to one surface of the PET film by the method described above, and an anchor coat layer having a desired thickness was formed on the surface of the PET film. On the other hand, the adhesive layer forming materials shown in Tables 1 and 2 described below were blended in the proportions shown in the same table, kneaded using a biaxial mixer, and then water-cooled and cut to produce adhesive pellets. . Then, the above adhesive pellets were extrusion-laminated with a T-die extruder on the anchor coat layer of the PET film prepared earlier, thereby forming an adhesive layer having a desired thickness. In this manner, the insulating tape having the anchor coat layer formed on the PET film surface and the adhesive layer made of the hot melt type flame retardant adhesive composition formed on the anchor coat layer (see FIG. 1) Was prepared. In addition, the tensile modulus of the adhesive layer was measured by the above-described method, and this was measured in Table 1 below.
And Table 2 together.

[0047]

Examples 9 and 10 Instead of the above PET film, a PI film having a desired thickness (Kapton manufactured by Du Pont-Toray Co., Ltd.) was used.
100 V). Otherwise, an insulating tape was produced in the same manner as in the above example.

[0048]

[Table 1]

[0049]

[Table 2]

[0050]

Comparative Examples 1 to 5 Insulating tapes were prepared in the same manner as in the Example except that the adhesive composition in which the adhesive layer forming materials shown in Table 3 below were blended in the proportions shown in the same table was used.

[0051]

[Table 3]

Using the insulating tapes of Examples and Comparative Examples obtained in this way, in accordance with the following criteria, flame retardancy, T-die workability, adhesiveness of insulating tape, adhesive strength, buckling resistance Measurement and evaluation were performed for the curl phenomenon. These results are shown in Tables 4 to 6 below.

[Flame retardancy] The flame retardancy is evaluated according to UL Standard S
ub. The test was performed according to the vertical combustion test described in 758 VW-1. Then, those that passed the above-mentioned standards were indicated as ○.

[T-die workability]
The adhesive was laminated using an extrusion laminator (a die width of about 600 mm) so as to have a thickness of 50 μm, and it was evaluated whether or not the eye could be processed into a long length without unevenness of the eyes, thickness unevenness, and the like. In the case of the eyes and the eye, no unevenness of thickness, no pierced ears, etc. were generated. In the above, those which frequently occurred on the eyes and adhered to the product, or those which were severely cut off from the ears and were so uneven in thickness that they could not be stretched to a predetermined thickness (50 μm) and could not be stretched were indicated as x.

[Insulation Tape Adhesion] The insulation tape adhesion was evaluated by unwinding the coil of the insulation tape prepared in the above evaluation of the T-die workability. Then, unwrapped ones with no problem are marked with ○, and those with slight adhesion and resistance to unwinding are marked with △, the adhesive on the adhesive surface is strong, the adhesion to the back of the polymer film is strong, and the winding is successful. Those that could not be loosened were indicated by x.

[Adhesive Strength (to Copper Foil)] The adhesive layer of the insulating tape was adhered to a 50 μm-thick rolled copper foil (Sn-plated product) by a heat roll laminating method. The lamination conditions at this time were as follows: a pair of two silicon rubber rolls having a diameter of 80 mm, a roll temperature of 160 ° C., a lamination speed of 0.5 mm / min, and a lamination linear pressure of 6.0 kgf.
/ Cm. Then, the obtained adhesive was cut into a width of 10 mm to obtain a test sample. This was subjected to a 180-degree peel test at a speed of 50 mm / min using a strograph (R-2 type manufactured by Toyo Seiki Co., Ltd.), and the peel strength between the Sn-plated copper foil and the insulating tape was measured.

[Bucking resistance] Two insulating tapes were bonded by a heat roll laminating method under the same conditions as in the evaluation of the adhesive force (to copper foil) so that the respective adhesive layers were in contact with each other. This was formed into a test sample having a width of 50 mm and a length of 150 mm. Using this test sample, buckling resistance was evaluated using the above-mentioned strograph. That is, as shown in FIG. 3, after placing the test sample 12 between the two support plates 14a and 14b and fixing the test sample 12 with the tape 13, the support plate 14b is moved at a constant speed in the direction of the arrow to generate a compressive force. And pressurized until the test sample 12 was completely bent, and the load-compression distance curve at that time was recorded on a chart paper. In the drawing, reference numeral 11 denotes a load cell. FIG. 4 shows an example of the load-compression distance curve. In FIG. 4, a curve 16 is a curve without buckling, and a curve 15 is a curve with buckling. In the case of buckling, a peak 17 appears on the curve 15. Therefore, the evaluation of the buckling resistance was indicated by ○ when the peak 17 did not appear at all, Δ when the peak 17 slightly appeared, and x when the peak appeared many times.

[Curl Phenomenon] The evaluation of the curl phenomenon was as follows.
The insulating tape cut into a size of 50 mm × 200 mm in length was placed on a horizontal table with the adhesive side up, and the height of the insulating tape at the end was measured. Then, if the lifting height is less than 10 mm,
Those of m or more and less than 20 mm were indicated by Δ, and those of 20 mm or more were indicated by x.

[0059]

[Table 4]

[0060]

[Table 5]

[0061]

[Table 6]

From the results shown in Tables 4 and 5, the insulating tapes of the examples manufactured using the hot-melt type flame-retardant adhesive composition of the present invention show flame-retardant properties, T-die workability, and insulating tapes. It can be seen that the evaluations of tackiness, adhesive strength (to copper foil), buckling resistance and curl phenomenon are all excellent. Above all, the tensile elastic modulus of the adhesive layer is 8 to 20 kg / mm.
The insulating tapes of Examples 4 to 6 set in the range of ² can further reduce the curling phenomenon, and
It turns out that buckling resistance is more excellent.

On the other hand, from the results shown in Table 6 above, the insulating tapes of Comparative Examples 1 to 5 produced using the adhesive composition of Comparative Example had extremely low adhesive strength (to copper foil) and were difficult to use. Flammability,
In the evaluation of the T-die workability, the insulating tape adhesiveness, the buckling resistance, and the curl phenomenon, it can be seen that it is inferior to the insulating tape of the example product.

[0064]

As described above, the hot-melt type flame-retardant adhesive composition of the present invention comprises the above-mentioned special polyolefin resin (component A) as a base polymer, the above-mentioned specific flame retardant (component B) and Antimony trioxide (C)
Component). That is, when the maleic anhydride-grafted linear low-density polyethylene (A ₁ ) is used as the special polyolefin resin (component A), the cost is low and the adhesiveness is good. When the flame retardant (component B) is blended, when the adhesive film is processed, the T-die extruder does not have an eye or the like at the tip, so that the processability is excellent and the cost is low. Furthermore the a ₁ and the specific flame retardant (B component)
In addition, when antimony trioxide (component C), which is the above-mentioned flame retardant aid, is added, the flame retardancy is further improved. And
If the above maleic anhydride-grafted ultra-low-density polyethylene (A ₂ ) is blended into a blend system of A ₁ , a specific flame retardant (component B), and antimony trioxide (component C) as a flame retardant aid, , While maintaining the aforementioned processability and flame retardancy,
Adhesion is further improved. According to the present invention, it is possible to provide a hot-melt type flame-retardant adhesive composition which is inexpensive, excellent in adhesiveness and workability, and excellent in flame retardancy. As described above, the hot-melt type flame-retardant adhesive composition of the present invention is inexpensive, excellent in adhesiveness and workability, and excellent in flame retardancy. It is most suitable as a material for forming an adhesive layer of an insulating tape used for an electric wiring portion such as a home or an indoor or outdoor wiring at home.

An insulating tape in which an anchor coat layer is formed on the surface of a polymer film and an adhesive layer made of the hot-melt type flame-retardant adhesive composition is formed on the anchor coat layer is curled. The effect is that the phenomenon can be mitigated and the buckling resistance is excellent.

Further, the adhesive layer made of the hot-melt type flame-retardant adhesive composition has a tensile modulus of 8 to 20 k.
By setting the ratio in the range of g / mm ² , the curl phenomenon can be further alleviated, and the buckling resistance is further improved. Therefore, when a flat cable is manufactured using such an insulating tape, there is an effect that the workability is excellent and the productivity is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an insulating tape using the hot melt type flame retardant adhesive composition of the present invention.

FIG. 2 is a cross-sectional view of an insulating tape using a conventional adhesive composition.

FIG. 3 is an explanatory diagram of a method for measuring buckling resistance.

FIG. 4 is a curve diagram of a load-compression distance obtained in the measurement of the buckling resistance.

[Explanation of symbols]

 1 adhesive layer 2 anchor coat layer 3 polymer film

Claims (9)

[Claims] 1. A hot-melt type flame-retardant adhesive composition comprising the following component (A) as a base polymer and the following components (B) and (C): (A) A polyolefin resin comprising at least one of the following (A ₁ ) and (A ₂ ). (A ₁ ) Maleic anhydride graft-modified linear low density polyethylene. (A ₂ ) Maleic anhydride graft-modified ultra low density polyethylene. (B) A flame retardant comprising at least one of the following (B ₁ ) and (B ₂ ). (B ₁ ) ethylenebispentabromodiphenyl. (B ₂ ) decabromodiphenyl oxide. (C) Antimony trioxide. Wherein said (A) in the component of (A ₁₎ (A ₂₎
The mixing ratio of (A ₁ ) / (A ₂ ) = 30 /
The hot-melt type flame-retardant adhesive composition according to claim 1, which is set in a range of 70 to 95/5. 3. The blending amount of the component (B) is as follows:
The hot-melt type flame-retardant adhesive composition according to claim 1 or 2, which is set in the range of 30 to 80 parts by weight based on 100 parts by weight of the component. 4. The compounding amount of the component (C) is as follows:
The hot-melt type flame-retardant adhesive composition according to any one of claims 1 to 3, which is set in a range of 5 to 40 parts by weight based on 100 parts by weight of the component. 5. An adhesive coat layer is formed on a surface of a polymer film, and the hot melt type flame-retardant adhesive composition according to claim 1 is bonded onto the anchor coat layer. An insulating tape, comprising an agent layer. 6. An adhesive layer comprising the hot-melt type flame-retardant adhesive composition having a tensile modulus of 8 to 20 kg / m.
insulating tape according to claim 5, wherein it is set to a range of m ^2. 7. The insulating tape according to claim 5, wherein the polymer film is at least one of a polyester film and a polyimide film. 8. The insulating tape according to claim 5, wherein the anchor coat layer is formed by an anchor coat agent containing an organic titanium compound as a main component. 9. The group comprising the above-mentioned organotitanium compound comprising tetraisopropoxytitanium, tetra-n-butoxytitanium, tetrakis (2-ethylhexyloxy) titanium, tetrakisstearyloxytitanium and diisopropoxybis (acetylacetonato) titanium. The insulating tape according to claim 8, which is at least one selected from the group consisting of: