JPH10237413A - Urethane-based adhesive composition for insulating tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive composition having high adhesiveness over a wide range of temperature, by using a base resin comprising a thermoplastic, an ester type urethane resin having a glass transition temperature in a specific range, an acrylic resin and a polystyrene resin having a glass transition temperature in a specific range. SOLUTION: This adhesive composition comprises a thermoplastic base resin comprising 80 to 98 pts.wt. of an ester type urethane resin having hot melt properties and having a glass transition temperature in a range of 25 to 40 deg.C and 2 to 20 pts.wt. of an acrylic resin or a polystyrene resin having a glass transition temperature in a range of 40 to 65 deg.C. The composition may further be compounded, if desired, with a bromine-based flame retardant and a chlorine- based flame retardant in an amount of 20 to 60 pts.wt. in total, relative to 100 pts.wt. of the base resin, a hydrophobic silica having a particle size of 0.01 to 10μm in an amount of 5 to 10 pts.wt., and a talc and/or clay having a particle size of 0.1 to 10μm in an amount of 5 to 50 pts.wt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a urethane-based adhesive composition for an insulating tape, and more particularly to a hot-melt adhesive composition using a thermoplastic ester-type urethane resin, which provides an adhesive layer in an insulating tape. It is.

[0002]

BACKGROUND ART Conventionally, there has been known an insulating tape in which an adhesive layer having electrical insulation properties is formed by coating on a resin film such as a polyester film.
For example, it is used as a constituent material of a flat cable for internal wiring in electronic / electric devices, automobiles, and the like, in which an insulating tape is attached to both surfaces of a copper foil. Japanese Patent Laid-Open No. 5-
One example is also disclosed in Japanese Patent No. 159632.

[0003] In particular, flat cables have been used in a wide range of applications today, such as computers, office automation equipment, mobile phones, and even automobiles. There is a demand for higher performance and higher functionality. More specifically, the recent increase in the density of OA equipment raises the temperature of the operating environment, and in many cases, mobile phones and the like are placed in various environments, and are therefore used in such applications. The adhesive for providing the adhesive layer in the insulating tape generally includes-
It is required to maintain excellent adhesive properties in a temperature range of 30 ° C. to 80 ° C., and for automobiles, it is more severe, and it is required to develop properties in a temperature range of −40 ° C. to 110 ° C. It is being done.

[0004] Further, in the case of an insulating tape having a predetermined adhesive layer formed using a thermoplastic adhesive, the insulating tape may be wound in a roll shape, for example, in a high temperature atmosphere during storage in summer or the like. When exposed to for a long time,
The adhesive layer and the resin film that is brought into contact with the surface are stuck, and it is often impossible or impossible to rewind the roll, so-called blocking occurs, which is one problem. .

Conventionally, polyester-based hot-melt adhesives have been mainly used as solvent-coated adhesives for providing adhesive layers in insulating tapes used for flat cables and the like. Then, in such an adhesive, two polyesters having different glass transition points (Tg) are blended in order to maintain the properties in a wide temperature range from a high temperature to a low temperature,
It constitutes a thermoplastic base resin,
We are trying to put it to practical use.

[0006] However, such conventional polyester-based adhesives can exhibit any desired properties by changing the copolymer composition of the base resin (polyester), but have the problem that the adhesive force changes greatly with changes in ambient temperature. Therefore, as described above, polyesters having different Tg's are blended to achieve a balance of properties and achieve practical use. However, such adhesives have low adhesive strength as a whole. There was a tendency to be an eye. Further, there is an inherent problem that the amount of the low Tg polyester component added is restricted in order to prevent blocking of the insulating tape as a product.

On the other hand, when a polyester having a high Tg is used in order to improve the heat resistance of the adhesive,
The adhesive strength in the temperature range from normal temperature to low temperature is reduced, and T is required to maintain the adhesive strength in the low temperature range.
Conversely, when a polyester having a low g is used, there is a problem that the heat-resistant adhesive strength is greatly reduced. Further, the polyester having a low Tg has tackiness, and therefore has excellent adhesiveness, but since it causes blocking in a product, it was necessary to suppress the addition amount. is there.

[0008]

In view of the circumstances described above, the present inventors have developed various types of thermoplastic base resins for hot-melt type insulating tape adhesives so as to exhibit high adhesive strength over a wide temperature range. As a result of the study, the object was advantageously achieved by using a thermoplastic ester type urethane resin having a urethane bond in the main chain and having a Tg (glass transition point) within a predetermined range, instead of the conventional polyester type. The inventors have found that the present invention can be obtained, and have completed the present invention.

Accordingly, a main object of the present invention is to provide a practical urethane-based adhesive composition for insulating tapes that can exhibit high adhesive strength over a wide temperature range.

[0010]

SOLUTION: The present invention is applied to a resin film in the form of a layer in order to solve such a technical problem,
A hot-melt type urethane-based adhesive composition for an insulating tape, which constitutes an adhesive layer of an insulating tape, wherein the thermoplastic base resin has a glass transition point in the range of 25 ° C to 40 ° C. The gist of the invention is a urethane-based adhesive composition for an insulating tape, characterized by using a urethane resin.

The present invention also provides a hot-melt type urethane-based adhesive composition for an insulating tape, which is applied in a layer form on a resin film to constitute an adhesive layer of the insulating tape,
Glass transition point of 25 ° C ~
A component comprising a thermoplastic ester-type urethane resin in the range of 40 ° C. and a B component comprising an acrylic resin or a polystyrene resin having a glass transition point in the range of 40 ° C. to 65 ° C., and When the mixing ratio of both A and B components is 100 parts by weight as their total amount,
The gist of the urethane-based adhesive composition for insulating tapes, wherein the A component is 80 to 98 parts by weight and the B component is 2 to 20 parts by weight, is also described. , In addition to the A component, by blending a predetermined amount of the B component, by using as a thermoplastic base resin, without lowering the adhesive force of the intended adhesive composition,
The blocking resistance can be further improved.

Further, the present invention provides a urethane-based adhesive composition for a hot-melt type insulating tape which is applied in a layer form on a resin film to constitute an adhesive layer of the insulating tape, wherein the thermoplastic base resin is Glass transition point is 25
A component A composed of a thermoplastic ester urethane resin in the range of 40 ° C. to 40 ° C .; a component B composed of an acrylic resin or a polystyrene resin having a glass transition point in the range of 40 ° C. to 65 ° C .; Point is -40 ° C to -10
When a C component consisting of a thermoplastic ester type urethane resin within the range of ° C. is used, and the mixing ratio of the three components A, B, and C is 100 parts by weight, the A component is = 60 to 96 parts by weight, B component = 2 to 20 parts by weight, C component = 2 to 20 parts by weight, the gist of the urethane-based adhesive composition for insulating tapes. Things. As described above, by blending a specific C component in addition to the A component and the B component to form the thermoplastic base resin, the adhesion in the low temperature region where the blending of the B component is slightly reduced. Thus, the blocking resistance can be effectively improved while improving the property.

According to a preferred embodiment of the urethane adhesive composition for an insulating tape according to the present invention, the acrylic resin is a homopolymer of methyl methacrylate or a copolymer containing the same as a main component. Will be used.

According to another preferred embodiment of each of the above adhesive compositions according to the present invention, a flame retardant is blended with the thermoplastic base resin to form a flame retardant adhesive composition. In addition, a hydrophobic silica and at least one of talc and clay are blended to obtain a desired adhesive composition. As a result, while maintaining excellent adhesiveness,
The flame retardancy can be advantageously improved, and the blocking resistance can be more effectively increased.
In addition, the melt viscosity at the time of combustion can be increased, and the generation of drip can be effectively prevented.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the urethane-based adhesive composition for an insulating tape according to the present invention, a resin used as a thermoplastic base resin (A component)
Is a hot-melt type thermoplastic ester type polyurethane resin having a urethane bond in the main chain, and has a glass transition point (Tg) in the range of 25 ° C to 40 ° C. Tg of such ester type polyurethane resin
However, when the temperature is lower than 25 ° C., blocking is caused, and when the Tg is higher than 40 ° C., the adhesiveness is reduced. From the viewpoint of blocking properties and the like, in the present invention, an ester type urethane resin having a Tg in the range of 25 ° C to 40 ° C is used.

As is well known, such an ester type urethane resin is reacted (polycondensation) using a diol component, a dicarboxylic acid component and an isocyanate component according to a polymerization technique such as bulk polymerization or solution polymerization. ) At least, it is usually produced by reacting a diol component and a dicarboxylic acid component in advance to prepare a linear polyester, and then further reacting an isocyanate component with the desired ester type. A urethane resin will be prepared. Various types of such thermoplastic ester-type urethane resins are commercially available, and in the present invention, among such commercially available products,
An ester-type urethane resin having a Tg range satisfying the requirements of the present invention is selected and used.

The diol component for providing the above-mentioned thermoplastic ester type urethane resin includes ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol and neopentyl. Glycol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,10-decanediol and the like. Examples of the dicarboxylic acid component include phthalic acid, terephthalic acid, isophthalic acid, Aromatic dicarboxylic acids such as 1,4-naphthalenedicarboxylic acid, and aliphatic dicarboxylic acids such as maleic anhydride, succinic acid, adipic acid, azelaic acid, sebacic acid, suberic acid, pimelic acid, and dodecanedicarboxylic acid are exemplified. And the isocyanate component further includes 4,4'-di E methane diisocyanate (M
DI), tolylene diisocyanate, 1,5'-naphthalene diisocyanate, tolidine diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate (XDI), hydrogenated MDI, hydrogenated XDI, and the like. And
These diol components, dicarboxylic acid components, and isocyanate components are each used alone or in combination of two or more to form an intended ester-type urethane resin.

Further, according to the present invention, in order to improve the blocking resistance without lowering the adhesive strength,
An acrylic resin or Tg together with the component A composed of an ester type urethane resin having a Tg of 25 ° C to 40 ° C as described above.
Is in the range of 40 ° C. to 65 ° C., and the mixing ratio of both A and B components is 80 to 98 parts by weight of A component and 2 to 2 parts of B component. It is necessary that the amount be 20 parts by weight (however, A component + B component = 100 parts by weight). However, when the amount of the component B is small, the effect of the compound cannot be sufficiently exhibited. When the amount exceeds 20 parts by weight, the adhesiveness in a low-temperature region becomes poor. This is because it becomes lower.

The acrylic resin used as the component B is a homopolymer or a copolymer of an acrylate or a methacrylate, and is appropriately selected from commercially available ones. In particular, in the present invention, a homopolymer of methyl methacrylate or a copolymer containing methyl methacrylate as a main component (50% or more) is advantageously used.
The polystyrene resin, which is another component of the B component, is
g must be between 40 ° C. and 65 ° C.
If it is out of the range, a sufficient effect of improving the anti-blocking property cannot be expected, and an adverse effect will also occur in the adhesiveness.

Further, in the present invention, as described above,
By adding the component B to the component A, in order to improve the adhesive property of the target adhesive composition in the low-temperature region, the glass transition point is -40 ° C to -1 ° C.
The C component consisting of a thermoplastic ester type urethane resin having a urethane bond in the main chain within the range of 0 ° C. is further compounded. The mixing ratio of the three components A, B, and C is Component = 60 to 96 parts by weight, Component B = 2
To 20 parts by weight, C component = 2 to 20 parts by weight (however, A component + B component + C component = 100 parts by weight). If the amount of the C component is too small,
This is because the effect of improving the low-temperature adhesiveness cannot be sufficiently exerted, and a problem such as a decrease in heat resistance is caused even if the amount is too large.

The ester-based urethane resin as the component C is similar to the above-mentioned ester-type urethane resin as the component A, and differs only in Tg. Similarly, one or more of each of the above-mentioned diol component, dicarboxylic acid component, and isocyanate component are appropriately selected, and they are reacted (polycondensed), so that the target Tg is − It will be prepared in the range of 40C to -10C. When the Tg of such an ester-type urethane resin is lower than -40 ° C, even a small amount of addition causes problems such as a decrease in heat resistance, and in the case of a Tg higher than -10 ° C, This causes problems such as a decrease in adhesive strength at low temperatures. Such a thermoplastic ester type urethane resin in the Tg region is already commercially available, and in the present invention, it is appropriately selected from such commercially available products and used.

By the way, the above-mentioned component A or A, B
In an insulating tape to which an adhesive composition based on two components, or three components A, B, and C, is applied,
Since it is required to have flame retardancy together with its excellent bonding workability, such adhesive compositions according to the present invention include flame retardants similar to conventional flame retardants, for example, bromine flame retardants. And chlorine-based flame retardants are appropriately blended, and if necessary, in addition to those flame retardants, a flame retardant auxiliary will be blended, but even in this flame retardant auxiliary,
Conventionally known ones such as inorganic flame retardant aids are appropriately selected,
Will be used. In addition, as a brominated flame retardant,
Decabromodiphenyl oxide, hexabromobenzene, brominated bisphenol A, ethylenebispentabromodiphenyl, etc., and as the chlorinated flame retardant, chlorinated paraffin, chlorinated polyethylene, etc., and as the inorganic flame retardant auxiliary, Antimony trioxide, aluminum hydroxide, magnesium hydroxide, etc., may each be exemplified,
One of these may be used alone or in combination of two or more.

The amounts of these flame retardants and flame retardant auxiliaries are not particularly limited. However, if a small amount is used, sufficient flame retardancy cannot be obtained. In general, each flame retardant is added in an amount of about 20 to 60 parts by weight, based on 100 parts by weight of the thermoplastic base resin, because the adhesive properties are reduced. Flame retardant aids total 3
In an amount of about 0 parts by weight or less,
It is added and blended.

Further, in the present invention, the blending system comprising a flame retardant and a flame retardant aid blended with the thermoplastic base resin as described above, further comprises talc and clay together with hydrophobic silica. At least one of them is suitably blended, whereby the flame retardancy and the blocking resistance can be significantly improved without any decrease in the adhesiveness.

By the way, the hydrophobic silica used here is a material obtained by making the surface of standard silica known as a refractory raw material hydrophobic, for example, by covering the surface with CH ₃ groups. By using such a hydrophobic silica and blending it into the blending system, unlike the case of using hydrophilic silica, no hydrolysis of the thermoplastic base resin occurs and the adhesive composition is difficult to produce. The flammability can be advantageously improved.

The hydrophobic silica is used as a thickener to increase the viscosity of a predetermined rubber material or resin material, or to increase the thixotropic property of a paint or the like to prevent sedimentation of pigments or the like in the paint. Such a water-resistant silica is generally used as an anti-settling agent and the like, and is used in the present invention. Therefore, in the adhesive composition containing such hydrophobic silica, the melting temperature at the time of combustion can be increased, and the generation of drip can be effectively prevented. When the composition is prepared as a coating liquid, its thixotropy can be advantageously enhanced, whereby sedimentation and deposition of various fillers can be prevented as much as possible and even if it occurs Excellent redispersibility can be exhibited, and both the storage stability and handleability of such a coating liquid can be effectively improved.

Incidentally, such hydrophobic silica includes:
Generally, granular or powdery solid particles are used, but the specific shape is not limited at all. The particle size is also not particularly limited and is appropriately determined in consideration of dispersibility in a base resin and the like.
Particles having a particle size of about m will be used. Further, even in the amount of the hydrophobic silica, it is appropriately determined according to the purpose. However, in order to advantageously bring out the effect of improving the blocking resistance in cooperation with talc and / or clay, It is desirable that the ratio be in the range of 5 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic base resin.

As the talc and / or clay blended in the blending system together with the hydrophobic silica, any known talc and / or clay can be appropriately used.
Various types of clay, such as kaolin clay, calcined clay, and pyrophyllite clay, are used as appropriate. Further, the particle size of such talc or clay is not particularly limited, and, like the hydrophobic silica, is appropriately determined in consideration of dispersibility in a base resin and the like, Generally, 0.1-10μ
Particles having a particle size of about m will be used. Further, the amount of the talc or clay is also determined appropriately according to the purpose, but in order to effectively improve the blocking resistance, usually, 100 parts by weight of the thermoplastic base resin. Thus, it can be advantageously blended in a proportion within the range of 5 to 50 parts by weight.

In the urethane-based adhesive composition for insulating tape according to the present invention, the above-described flame retardant and flame retardant auxiliary, and further, hydrophobic silica, talc and / or clay are compounded. Further, if necessary, known compounding agents and additives which have been conventionally used can be compounded for various purposes at the same compounding ratio as the conventional one. That is, in such an adhesive composition, for example, titanium dioxide or the like may be blended in order to impart concealing properties. Various fillers for the purpose of lowering, etc., plasticizers, antioxidants, copper damage inhibitors and the like can be appropriately compounded.

Further, in order to perform solvent coating using the urethane-based adhesive composition for an insulating tape having the above configuration, when preparing a coating liquid, alcohol, toluene, acetone, methyl ethyl ketone or the like must be used. Using a predetermined solvent, the above-mentioned specific thermoplastic base resin (A component, B component, C component) is dissolved in the solvent, and, if necessary, a flame retardant, hydrophobic silica, talc, clay or the like. ,
Further, various compounding agents including a flame retardant aid are contained and dispersed, respectively, to prepare a target coating liquid.

Then, using the coating solution of the adhesive composition according to the present invention thus prepared, on one surface of a predetermined resin film such as a PET film, according to a conventional method.
After applying in a predetermined thickness, by drying this, an adhesive layer made of such an adhesive composition is formed,
The intended insulating tape can be produced, and this insulating tape is used for flat cables and the like, and exhibits excellent adhesive properties and the like.

[0032]

EXAMPLES Hereinafter, some examples of the present invention will be described to clarify the present invention more specifically. However, the present invention imposes some restrictions by the description of such examples. It goes without saying that you don't receive anything. In addition, the present invention, in addition to the following examples, in addition to the above specific description, various modifications based on the knowledge of those skilled in the art, unless departing from the spirit of the present invention,
It should be understood that modifications, improvements and the like can be made.

First, as a component A of the thermoplastic base resin, a random copolymer obtained by reacting four components of a diol component: ethylene glycol and neopentyl glycol and a dicarboxylic acid component: adipic acid and phthalic acid is used. A thermoplastic ester type urethane resin having a Tg of 30 ° C. obtained by reacting a linear polyester with hexamethylene diisocyanate as an isocyanate component: urethane (1) is prepared. Acrylic resin: Crisbon Assister NB-60-33 (methyl methacrylate resin) manufactured by Dainippon Ink and Chemicals, Inc. or polystyrene resin: Hymer ST-95 manufactured by Sanyo Chemical Industry Co., Ltd. Similarly to the components, diol components: 1,6-hexanediol, 1, -Butanediol and dicarboxylic acid component: a polyester composed of a random copolymer of three components consisting of adipic acid, reacted with 4,4'-diphenylmethane diisocyanate and tolidine diisocyanate as isocyanate components (bulk polymerization) At least, a thermoplastic ester type urethane resin having a Tg of −20 ° C. to −10 ° C .: urethane (2) was prepared.

For comparison, as the thermoplastic base resin, polyester (high Tg): Eritaire UE-3500 (Tg = 35 ° C.) manufactured by Unitika Ltd. and polyester (low Tg): Eritaire U manufactured by Unitika Ltd.
E-3220 (Tg = 5 ° C.) was prepared.

Further, as other compounding agents, bromine-based flame retardant ethylene bispentabromodiphenyl (Cytex 8010: Albemar Corporation), antimony trioxide as a flame retardant auxiliary (Sumitomo Metal Mining Co., Ltd.), hydrophobicity Silica (Aerosil R-972: Nippon Aerosil Co., Ltd.), talc (Simgon: Nippon Talc Co., Ltd.), and clay (Samson Clay: Takagi Clay Co., Ltd.) were prepared, respectively.

Then, the respective components are dissolved or dispersed in a mixed solvent of methyl ethyl ketone and toluene in the amounts shown in Tables 1 and 2 below to obtain various insulating materials having different compositions from each other. A coating solution of the adhesive composition for tape was prepared. In addition, among the plurality of coating liquids, the one using urethane (1) as a main component of the thermoplastic base resin was used as an example, while the one using polyester or the like was used as a comparative example.

Next, using each of the coating solutions and a separately prepared PET film (thickness: 12 μm),
Various coating liquids are coated on one surface of the T film, respectively, and then dried to form an insulating layer having an adhesive layer having an adhesive composition having a different composition and a thickness of 20 μm. I got the tape. Then, using the various insulating tapes thus obtained, the adhesiveness (in the temperature range of -40 ° C to 80 ° C) and the anti-blocking property of the adhesive composition constituting the adhesive layer of each insulating tape as described below. The properties were examined, and the results are shown in Tables 1 and 2 below.

Using an adhesive heat roll, the roll temperature was 170 ° C., and the linear speed was 0.1 mm.
Under a condition of 5 m / min and a pressure of 3.0 kg / cm ^2, a 50 μm-thick copper foil having a surface plated with tin was bonded to the adhesive layer side of each insulating tape.
Various test pieces with different types of insulating tape were produced, and 1 cm ×
Three 10 cm sample pieces were cut out. Then, using a large number of sample pieces thus obtained, at a temperature of −40 ° C., room temperature, or 80 ° C. in accordance with JIS-K-6854, a tensile speed:
A 180 ° peel test was performed under the condition of 50 mm / min, and the load when the copper foil was peeled 180 ° from each sample piece was measured, whereby the adhesive force (initial adhesive force) of each adhesive composition was measured. Examined. And the measured value is 0.5kg
/ Cm or more, that is, those having excellent adhesiveness were evaluated as ○, and the measured values were 0.3 kg / cm or more and 0.5
If the measured value is less than 0.3 kg / cm and the adhesiveness is inferior, the value is less than 0.3 kg / cm. Each was evaluated as x.

Blocking resistance: From each of the insulating tapes, a 2.5 cm × 15 cm strip was cut into 3 pieces.
On the other hand, assuming a state in which a 10 cm × 15 cm sheet piece is cut out and an insulating tape is wound in a coil shape, the three strip pieces are superimposed on the resin film surface of the sheet piece on the surface on the adhesive layer side. And then, on the surface on the opposite side of the overlapping surface of the strip and the sheet,
A release PET film and a silicone rubber sheet are placed in this order, and in that state, each is pressed by a hot press under the conditions of temperature: 50 ° C., time: 5 minutes, and surface pressure: 10 kg / cm ^2. Various blocking samples made of each insulating tape were produced by pressing the resin film surface of the insulating tape and the surface on the adhesive layer side by pressure bonding. Next, JIS-K-
In accordance with 6854, a T-type peel test was performed under the conditions of a tensile speed of 200 mm / min, and the load when each blocking sample was peeled into a T-type was measured. A sample having a measured value of less than 5 g / 25 mm, that is, a sample having extremely excellent blocking resistance, is marked as ◎. And the measured value is 10 g / 25 mm or more and 15 g / 25 mm
Less than, that is, although there is a slight problem in the blocking resistance, in the practicality is acceptable and △,
Further, those having a measured value of 15 g / 25 mm or more and poor blocking resistance were evaluated as x, respectively.

[0040]

[Table 1] Note) The compounding ratio is shown in parts by weight.

[0041]

[Table 2] Note) The compounding ratio is shown in parts by weight.

As is clear from these tables, in the adhesive compositions of Examples 1 to 5 according to the present invention, favorable evaluations were obtained in both the adhesiveness in a wide temperature range and the blocking resistance. Have been. On the contrary,
In the case where a conventional polyester is used as the thermoplastic base resin, even in the case where a compound having a different Tg is blended (Comparative Examples 3 and 4), the temperature is -40 ° C or higher.
A problem arises in adhesiveness in a wide temperature range of 80 ° C., and even when an ester type urethane resin is used, its T
g is out of the range of the present invention (Comparative Example 5), or when the ester type urethane resin having a Tg out of the range of the present invention is the main component of the thermoplastic base resin (Comparative Example 6). It is clear that this also causes a problem.

[0043]

As is clear from the above description, the urethane-based adhesive composition for an insulating tape according to the present invention has a wide range from a high temperature to a low temperature while securing sufficient blocking resistance. In the temperature range, it is possible to exert a high adhesive strength, and thus an insulating tape having an adhesive layer formed of such an adhesive composition, and further constituted by attaching such an insulating tape. The usefulness of materials such as flat cables can be greatly enhanced, and there is a great technical significance of the present invention.

Claims (5)

[Claims] 1. A hot-melt type urethane-based adhesive composition for an insulating tape, which is applied in a layer form on a resin film to form an adhesive layer of an insulating tape, and has a glass transition point as a thermoplastic base resin. A urethane-based adhesive composition for an insulating tape, wherein a thermoplastic ester-type urethane resin having a temperature in the range of 25 ° C to 40 ° C is used. 2. A hot-melt type urethane-based adhesive composition for an insulating tape, which is applied in a layer form on a resin film to constitute an adhesive layer of an insulating tape, and has a glass transition point as a thermoplastic base resin. A component consisting of a thermoplastic ester urethane resin in the range of 25 ° C to 40 ° C, and an acrylic resin or a glass transition point of 40 ° C to 6 ° C.
When a B component composed of a polystyrene resin in the range of 5 ° C. is used, and the mixing ratio of both A and B components is 100 parts by weight, A component = 80 to
A urethane-based adhesive composition for an insulating tape, wherein 98 parts by weight and the B component are 2 to 20 parts by weight. 3. A hot-melt type urethane-based adhesive composition for an insulating tape which is applied in a layer form on a resin film to form an adhesive layer of an insulating tape, wherein the thermoplastic base resin has a glass transition point. A component consisting of a thermoplastic ester urethane resin in the range of 25 ° C to 40 ° C, and an acrylic resin or a glass transition point of 40 ° C to 6 ° C.
Using a B component consisting of a polystyrene resin in the range of 5 ° C. and a C component consisting of a thermoplastic ester-type urethane resin having a glass transition point in the range of −40 ° C. to −10 ° C. Assuming that the mixing ratio of the three components B and C is 100 parts by weight, the A component is 60 parts by weight.
96 parts by weight, B component = 2 to 20 parts by weight, C component = 2
A urethane-based adhesive composition for an insulating tape, wherein the composition is 20 parts by weight. 4. The urethane adhesive for an insulating tape according to claim 2, wherein the acrylic resin is a homopolymer of methyl methacrylate or a copolymer containing the same as a main component. Composition. 5. A flame retardant is blended with the thermoplastic base resin to form a flame retardant adhesive composition, and further, at least one of hydrophobic silica, talc and clay. The urethane-based adhesive composition for an insulating tape according to any one of claims 1 to 4, wherein one is blended.