CN101631841A - adhesive tape - Google Patents

Abstract

An adhesive tape (3) comprising: a substrate (5) having a thickness of 50 to 200 μm, and an adhesive layer (6) having a thickness of 10 to 50 μm and provided on at least one surface (5a) of the substrate (5) . The substrate (5) is composed of a resin composition containing a polyolefin resin and a halogen-based flame retardant, and contains a halogen element in a ratio of 15% by weight to 35% by weight of the total amount of the resin composition. Thereby, an adhesive tape excellent in flame retardancy, flexibility, and mechanical strength is provided.

Description

adhesive tape

technical field

The present invention relates to an adhesive tape used in wire harnesses for automobiles and the like, particularly an adhesive tape having flame retardancy, flexibility, and mechanical strength.

Background technique

Currently, in automobiles, wiring harnesses are often used as internal wiring for electrically connecting various electronic and electrical components and devices. This wire harness includes a bundle of wires in which insulated wires having a conductor size suitable for the current flowing in various circuits are bundled. The bundle of wires is brought together by being threaded through a sleeve, or bound using an adhesive tape or sheet. The wire harness is connected to the electric system of the car, and various components such as connectors are attached to the ends of the wire harness.

The insulated wire used in the wire harness contains a stranded or compressed conductor of annealed copper, and a resin composition covering the conductor. As the resin composition, use a polyvinyl chloride (PVC) resin composition, or mix a halogen-based flame retardant such as a brominated flame retardant or a metal hydroxide with a polyolefin resin such as polypropylene (PP) or polyethylene (PE). A polyolefin resin composition that is flame-retardant by using non-halogen flame retardants such as chemicals.

In general, heat resistance is particularly required for wire harnesses arranged in the engine room or near the engine. Therefore, wire harnesses in which heat resistance is improved by subjecting the above-mentioned insulator to cross-linking treatment by irradiating an accelerated electron beam to the insulated wire or the like are used.

Here, when using the adhesive tape to bind the electric wire bundle, the electric wire bundle is wound while stretching the adhesive tape by manual operation. Therefore, the adhesive tape is required to have flexibility (stretchability) and mechanical strength. In addition, the adhesive tape is also required to have flame retardancy. More specifically, the flame retardancy was evaluated by the limiting oxygen index (LOI value) measured by the test method of oxygen index related to the flammability of plastics based on JIS K-7201. In this test method, the adhesive tape is ignited, and the oxygen concentration required to be extinguished within 4 seconds is 23.5 or more. The oxygen concentration is represented by the following formula.

Oxygen concentration = (oxygen partial pressure / (oxygen partial pressure + nitrogen partial pressure)) × 100

Adhesive tapes used in wiring harnesses placed in the engine compartment or near the engine require, in addition to the above characteristics, an initial tensile strength of 29.4N (19mm width) or higher and an initial elongation of 125% or higher. In addition, the tensile strength after heat aging at 120° C. for 7 days is required to be 29.4 N (19 mm width) or more, and the elongation is 100% or more. In addition, thermal shock resistance that does not cause melting after thermal shock at 200° C. for 30 minutes is also required.

Then, as an adhesive tape satisfying these characteristics, an adhesive tape in which an adhesive layer is provided on one side of a film-shaped base material mainly composed of a resin composition containing a polyvinyl chloride resin (for example, refer to Patent Document 1). In addition, as the base material of the adhesive tape used for the wiring harness arranged in the engine room or near the engine, a film-shaped base material mainly composed of a resin composition containing a polyvinyl chloride resin is irradiated with an accelerated electron beam. A base material that is cross-linked to improve heat resistance (for example, refer to Patent Document 2).

However, the conventional pressure-sensitive adhesive tape mainly contains polyvinyl chloride resin, and since the polyvinyl chloride resin contains a large amount of chlorine in its molecules, it generates dioxin when it is incinerated when it is discarded, and there is a problem that it has a large environmental load. Especially in recent years, under the background of increasing concern for environmental issues, the reduction of the amount of polyvinyl chloride resin used is being studied, and non-chlorine-based adhesive tapes are required as substitutes for adhesive tapes mainly composed of polyvinyl chloride resin. Adhesive tape for substrates with resin as the main component. However, there is a problem that the development of a non-chlorine adhesive tape having flame retardancy, flexibility, and mechanical strength equal to or higher than that of an adhesive tape mainly composed of polyvinyl chloride resin has not been carried out.

Patent Document 1: Japanese Patent Application Laid-Open No. 11-205945

Patent Document 2: Japanese Patent Application Laid-Open No. 8-259909

Contents of the invention

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an adhesive tape excellent in flame retardancy, flexibility, and mechanical strength equal to or higher than an adhesive tape mainly composed of polyvinyl chloride resin.

In order to achieve the above object, according to an embodiment of the present invention, there can be provided an adhesive tape comprising: a substrate having a thickness of 50 to 200 μm; and a substrate having a thickness of 10 to 50 μm provided on at least one surface of the substrate. Adhesive layer. It is characterized in that the base material of the adhesive tape is composed of a resin composition containing a polyolefin resin and a halogen flame retardant, and contains a halogen element in a ratio of 15% to 35% by weight of the total amount of the resin composition.

According to the above configuration, the base material is composed of a resin composition containing a polyolefin resin and a halogen-based flame retardant. Therefore, the base material is made of a non-chlorine resin instead of the conventional polyvinyl chloride resin, and it is possible to provide an adhesive tape having flexibility equal to or higher than that of an adhesive tape mainly composed of polyvinyl chloride resin and excellent mechanical strength.

In addition, the base material has a structure including a halogen-based flame retardant and a halogen element of 15% by weight to 35% by weight of the total amount of the resin composition. Therefore, in the pressure-sensitive adhesive tape, the limiting oxygen index (LOI value) measured in accordance with JISK-7201 can be set to 23.5 or more, and an pressure-sensitive adhesive tape excellent in flame retardancy can be provided.

Preferably, the resin composition further contains a styrene-based elastomer, and the content of the styrene-based elastomer is greater than that of the polyolefin resin. At this time, the flexibility of the adhesive tape is improved by blending a styrene-based elastomer.

The resin composition preferably contains only polyolefin resin as a base material of the halogen-based flame retardant. In this case, since only polyolefin resin is contained in a resin composition, the pressure-sensitive adhesive tape improved in oil resistance can be manufactured inexpensively.

The halogen flame retardant is preferably selected from chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenylene, perchloropentacyclodecane, decabromodiphenylethane, ethylene bistetrabromophthalimide, At least one of brominated polystyrene, brominated diphenyl ether, hexabromobenzene, hexabromocyclododecane, and tetradecabromodiphenoxybenzene. In this case, the flame retardancy of the pressure-sensitive adhesive tape can be improved by using an inexpensive and general-purpose halogen-based flame retardant.

The resin composition is preferably subjected to a crosslinking treatment. In this case, the heat resistance of the adhesive tape can be improved.

The crosslinking treatment is preferably performed by irradiation with ionizing radiation. In this case, rapid crosslinking treatment can be performed on the resin composition as the base material component.

Description of drawings

FIG. 1 is a schematic view showing the structure of a wire harness using an adhesive tape according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view showing an adhesive tape according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view illustrating a modified example of the pressure-sensitive adhesive tape according to the embodiment of the present invention.

Detailed ways

Next, preferred embodiments of the present invention will be described. FIG. 1 is a schematic diagram showing the structure of a wire harness using an adhesive tape according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the adhesive tape according to an embodiment of the present invention.

A wire harness 1 shown in FIG. 1 is used as internal wiring for electrically connecting various electronic and electric components or devices in an automobile. In this wire harness 1 , a plurality of insulated wires 2 are bundled to form a wire bundle, and an adhesive tape 3 is wound around the wire bundle. A connector 4 is connected to the end of the wire bundle of the plurality of insulated wires 2 , and is connected to the electric system of the automobile through the connector 4 .

As shown in FIG. 2 , the adhesive tape 3 is composed of a film base 5 and an adhesive layer 6 provided on one surface 5 a of the base 5 . The total thickness of the adhesive tape 3 can be set to 60 μm to 250 μm.

As the base material 5, a base material containing a non-chlorine resin as a main component, that is, a base material is used. In this embodiment, a base material 5 using a resin composition containing a The elastomeric resin composition is the base material 5 of the base material.

As polyolefin resins, for example, polypropylene-based resins (homopolymers, block polymers, random polymers), polypropylene-based resins polymerized with metallocene catalysts, polypropylene-based thermoplastic elastomers, reactive Device type polypropylene thermoplastic elastomer, dynamically vulcanized polypropylene thermoplastic elastomer, polyethylene resin (high density polyethylene resin, linear low density polyethylene resin, low density polyethylene resin, ultra low density polyethylene resin) , ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-propylene rubber, ethylene- Acrylic rubber, ethylene-glycidyl methacrylate copolymer, ethylene-methyl acrylate-glycidyl methacrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene ionomer, And these resins are modified by maleic anhydride and other polymers.

Examples of styrene-based elastomers include: styrene-ethylene-butylene-styrene copolymer, styrene-ethylene-butylene copolymer, styrene-ethylene-butylene-olefin copolymer, styrene-isoprene copolymer styrene-ethylene-isoprene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylene-isoprene-styrene copolymer, styrene-butadiene rubber, etc. , and chemically modified polymers such as their hydrogenated polymers, partially hydrogenated polymers, and their maleic anhydride-modified or epoxy-modified products can be exemplified. In addition, maleic anhydride-modified products or epoxy-modified products of these can also be exemplified, and these can be used alone or in combination of multiple types.

By forming the substrate 5 from a resin composition containing such a polyolefin resin or a styrene-based elastomer as a base material, it is possible to obtain the above-mentioned conventional adhesive having a resin composition containing a polyvinyl chloride resin as a main component. The pressure-sensitive adhesive tape 3 having equal or higher flexibility (stretchability) and mechanical strength (tensile strength) is used. In addition, depending on the flexibility and mechanical strength required for the pressure-sensitive adhesive tape 3, these resins may be used alone or as a mixture of two or more kinds. In addition, from the viewpoint of further improving various properties, the resin composition containing polyolefin resin or styrene-based elastomer can be used by mixing resin components other than the above, such as thermoplastic elastomer and ethylene-propylene rubber, and can also be alloyed. used later.

From the viewpoint of improving the operability when the adhesive tape 3 is wound up, the total thickness of the adhesive tape 3 is 50 μm to 200 μm.

As the adhesive layer 6, known adhesives such as rubber, hot melt, acrylic, and latex can be used. Wherein, as the material of rubber type, hot-melt adhesive type adhesive layer 6, can use for example: natural rubber, silicone rubber, isoprene rubber, styrene butadiene rubber, polyisoprene and nitrile rubber wait. In addition, from the viewpoint of improving the adhesive performance of the adhesive layer 6, the adhesive layer 6 may contain a tackifier. As the tackifier, a rosin ester tackifier, a terpene tackifier, Aliphatic petroleum hydrocarbon tackifiers and hydrogenated compounds, etc. In addition, by introducing a crosslinked structure by mixing a heat-reactive phenol resin, it is possible to control adhesive performance. Additives such as oil, wax, and antioxidant can be added to the adhesive layer 6 .

As an acrylic adhesive, the homopolymer of (meth)acrylate, or the copolymer with a copolymerizable monomer is mentioned. Examples of the (meth)acrylates or copolymerizable monomers include alkyl (meth)acrylates, glycidyl (meth)acrylates, (meth)acrylic acid, itaconic acid, maleic anhydride, (Meth)acrylamide, N-hydroxylamide (meth)acrylate, alkylaminoalkyl (meth)acrylate, vinyl acetate, styrene, acrylonitrile, etc. Among them, it is preferable to use an alkyl acrylate having a homopolymer glass transition temperature of -50° C. or lower as the main component resin. These polymers can adjust the degree of crosslinking and control the adhesive force by adding polyfunctional isocyanate or the like.

As a method for forming the adhesive layer 6 on one side 5a of the substrate 5, the following method can be used: first, the above-mentioned adhesive as the material of the adhesive layer 6 is dissolved in an organic solvent such as toluene, and then , coated on one surface 5a of the substrate 5 by casting method, roll coating method, reverse coating method and doctor blade method, etc., and volatilized and removed in a drying oven. The thickness of the adhesive layer 6 is preferably 10 to 50 μm, more preferably 15 to 40 μm, from the viewpoint of improving handleability.

From the viewpoint of improving the flame retardancy of the pressure-sensitive adhesive tape 3, in the present embodiment, the base material 5, which is the base material, mainly contains a resin composition containing a polyolefin resin or a styrene-based elastomer. Fuel. Examples of the halogen-based flame retardant include chlorine-based flame retardants such as chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenylene, perchloropentacyclodecane, or decabromodiphenylethane, ethylene bis Brominated flame retardants such as tetrabromophthalimide, brominated polystyrene, brominated diphenyl ether, hexabromobenzene, hexabromocyclododecane, and tetradecabromodiphenoxybenzene.

From the viewpoint of making the adhesive tape 3 satisfy the above-mentioned condition that the limiting oxygen index (LOI value) measured in accordance with JIS K-7201 is 23.5 or more, thereby improving the flame retardancy, in the present embodiment, the base material 5 of the adhesive tape 3 A halogen element is contained in the ratio of 15 weight% - 35 weight% of the resin composition whole quantity containing the said polyolefin resin. The reason is that when the content of the flame retardant is less than 15% by weight, the limiting oxygen index is less than 23.5, so sometimes it is difficult to improve the flame retardancy of the adhesive tape 3, and when it is greater than 30% by weight, it is sometimes difficult to improve the adhesion. Band 3 flame retardancy.

From the viewpoint of further improving the heat resistance of the pressure-sensitive adhesive tape 3 , it is preferable to perform a crosslinking treatment on the resin composition comprising the polyolefin resin constituting the base material 5 . As a crosslinking method, for example, a method of performing crosslinking by irradiation of ionizing radiation such as electron beams or gamma rays, or in a resin composition containing a polyolefin resin constituting the base material 5 can be used. Thermal crosslinking or silane crosslinking in which a crosslinking agent such as dicumyl peroxide or vinyl silane is added in advance, and then treated with pressurized steam or the like.

Among these crosslinking methods, crosslinking by irradiation with ionizing radiation is preferred from the viewpoint of rapid crosslinking treatment. At this time, the acceleration voltage of the electron beam can be appropriately set according to the thickness of the substrate 5 . For example, when the thickness of the substrate 5 is the above-mentioned 50 to 200 μm, it may be irradiated with an electron beam at an accelerating voltage of 200 kV to 1 MeV. In this case, the irradiation dose is preferably an absorbed dose of 60 to 480 kGy.

When using a polypropylene-based resin as the resin composition comprising a polyolefin resin constituting the substrate 5, it is preferable to add trimethylolpropane trimethacrylate or triallyl isocyanurate from the viewpoint of improving crosslinkability. Polyfunctional monomers such as acid esters.

According to the present embodiment described above, the following effects can be obtained.

(1) In the present embodiment, the pressure-sensitive adhesive tape 3 includes a substrate 5 having a thickness of 50 to 200 μm, and an adhesive layer 6 having a thickness of 10 to 50 μm and provided on one surface 5 a of the substrate 5 . In addition, the base material 5 uses a resin composition containing a polyolefin resin or a styrene-based elastomer as a base material. Therefore, it is possible to provide the adhesive tape 3 which contains non-chlorine resin instead of the conventional polyvinyl chloride resin and has flexibility and mechanical strength equal to or higher than that of an adhesive tape mainly composed of polyvinyl chloride resin. In addition, the base material 5 contains a halogen-based flame retardant, and contains a halogen element in a ratio of 15% by weight to 35% by weight of the total amount of the resin composition. Therefore, in the adhesive tape 3, the limiting oxygen index measured based on JISK-7201 can be set to 23.5 or more, and the adhesive tape 3 excellent in flame retardancy can be provided.

(2) In this embodiment, the halogen-based flame retardant contained in the substrate 5 is selected from chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenylene, perchloropentacyclodecane, decabromodiphenylethane, At least one of ethylene bistetrabromophthalimide, brominated polystyrene, brominated diphenyl ether, hexabromobenzene, hexabromocyclododecane, and tetradetrabromodiphenoxybenzene. Therefore, the flame retardancy of the pressure-sensitive adhesive tape 3 can be improved by an inexpensive and general-purpose halogen-based flame retardant.

(3) In the present embodiment, a resin composition comprising a polyolefin resin or a styrene-based elastomer constituting the base material 5 is subjected to a crosslinking treatment. Therefore, the heat resistance of the adhesive tape 3 can be improved.

(4) In the present embodiment, a crosslinking treatment by irradiation of ionizing radiation is performed on a resin composition comprising a polyolefin resin or a styrene-based elastomer constituting the base material 5 . Therefore, rapid crosslinking treatment can be performed on the resin composition.

In addition, the above-described embodiment may be modified as follows.

In the above-described embodiment, an adhesive layer 6 is provided on one side 5a of the film base 5. As shown in FIG. The adhesive layer 6 is provided on both surfaces of the substrate 5 .

Known stabilizers, colorants, reinforcing materials, fillers, foaming agents, antioxidants, and the like may be added to the resin composition constituting the substrate 5 as needed. At this time, when melt-mixing the resin composition, known mixers such as an open mill, a Banbury mixer, a pressure kneader, a single-screw mixer, and a twin-screw mixer can be used.

Example

Hereinafter, the present invention will be described based on Examples and Comparative Examples. In addition, this invention is not limited to these Examples, These Examples can be modified and changed based on the summary of this invention.

(Example 1)

(Making of base material)

As the polyolefin resin, (1) linear low-density polyethylene resin (manufactured by Japan Unica Co., Ltd., trade name DFDJ7540, MFR (melt mass flow rate) = 0.6 g/10 minutes (190° C., load 2.16 kg ), density 0.92g/cm ³ ), (2) low-density polyethylene resin (manufactured by Sumitomo Chemical Co., Ltd., trade name Sumikasen C215, MFR=1.4g/10min (190°C, load 2.16kg), density 0.92g/ cm ³ ), and (3) ethylene-vinyl acetate copolymer (manufactured by Mitsui-DuPont Polychemical Co., Ltd., trade name Evaflex EV360, MFR=3g/10min (190°C, load 2.16kg), vinyl acetate content= 25% by weight).

(4) Brominated flame retardant Decabromodiphenylethane (manufactured by Albemar Japan Co., Ltd., trade name Saytex 8010) was used as a halogen flame retardant. In addition, (5) antioxidant (manufactured by Ciba Seika Co., Ltd., brand name IRGANOX 1010), (6) antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.), and (7) zinc stearate were used. Then, the above-mentioned components (1)-(7) are mixed according to the ratio of 30/20/50/28/1/20/2 in terms of weight ratio, and after melting and kneading by a kneader (open mill), use A calender roll set at 135° C. was calendered to produce a film-like substrate having a thickness of 70 μm. In addition, the content of the bromine element was 15.1% by weight of the total amount of the resin composition containing the polyolefin resin. In addition, an electron beam at an acceleration voltage of 300 kV up to 120 kGy was irradiated to the prepared film-shaped substrate to crosslink the substrate.

(making of adhesive)

50 parts by weight of natural rubber, 40 parts by weight of styrene-based elastomer (manufactured by Clayton Japan Co., Ltd., trade name Kraton D), 10 parts by weight of terpene phenol resin (manufactured by Yasuhara Chemical Co., Ltd., trade name YS Polyster 2100) and antioxidant ( Ciba Specialty Chemicals Co., Ltd., trade name IRGANOX 1010) 1 part by weight was mixed with a toluene solvent to prepare a rubber-based adhesive having a solid content concentration of 20%.

(Production of Adhesive Tape)

Corona treatment is carried out on one side of the prepared substrate, and at the same time, the above-mentioned adhesive is coated with a reverse coater on the surface of the substrate, and it is dried in a constant temperature bath at 100°C for 3 minutes. A rubber-based adhesive layer with a thickness of 30 μm was formed on one surface to produce an adhesive tape with a total thickness of 100 μm.

(Evaluation of Flame Retardancy)

For the produced adhesive tape, the limiting oxygen index (LOI value) was measured according to JIS K7201, and the flame retardancy was evaluated. More specifically, the prepared adhesive tape is used as a test piece, and the upper part of the test piece is attached to a wire at a distance of 100 mm or more from the upper end of the combustion cylinder, and the wire is used as a support body, and is vertically attached to the measuring tool. superior. Then, the upper end of the test piece was brought into contact with the flame using an igniter, and the contact with the flame was stopped for 15 seconds or after the burning started obviously, and the time until the flame was extinguished was measured immediately. In addition, when the time until the flame is extinguished exceeds 4 seconds, reduce the oxygen concentration to repeat the measurement of the flame extinguishment time, and when the flame is extinguished immediately or less than 4 seconds after ignition, increase the oxygen concentration and repeat the measurement of the flame extinguishment time. Then, determine the maximum oxygen flow rate to extinguish the flame within 4 seconds, use the following (Formula 1) to obtain the limiting oxygen index (LOI value), and the limiting oxygen index is 23.5 or more as a pass. The above results are shown in Table 1.

LOI value = (oxygen flow rate) × 100/(oxygen flow rate + nitrogen flow rate)...(Formula 1)

(flexibility evaluation, mechanical strength evaluation)

Three test pieces with a length of 150 mm and a width of 19 mm were prepared from the produced adhesive tape, and evaluation points were set at intervals of 50 mm in the center of each test piece. Then, these test pieces were stretched at a speed of 300 mm/min using a constant-speed tension type tensile testing machine (manufactured by Shimadzu Corporation, trade name AGS-1kNJ), and the elongation at the time of fracture of the test piece was measured. , calculate the average value of three test pieces, and evaluate the softness. In addition, the maximum tensile strength until the test piece was broken was measured, and the average value of three test pieces was calculated to evaluate the mechanical strength. Table 1 shows the above results. In addition, when the tensile strength is 29.4 N or more, it is evaluated that it has mechanical strength, and when the elongation is 125% or more, it is evaluated that it has flexibility. In addition, when the width of the test piece is different from 19 mm, it is converted into a width of 19 mm on a proportional basis.

(Heat resistance evaluation)

Three test pieces with a length of 150 mm and a width of 19 mm were prepared from the prepared adhesive tape, and each test piece was stored at 120±2° C. for 168 hours, and then naturally cooled at room temperature for more than 30 minutes. Then, the elongation and maximum tensile strength of the test piece were measured by the same method as above, and the heat resistance was evaluated. Table 1 shows the above results. In addition, when the tensile strength is 29.4 N or more and the elongation is 100% or more, it is evaluated as having heat resistance.

(Evaluation of thermal shock resistance)

As another heat resistance evaluation, thermal shock resistance was evaluated by examining whether or not melting was observed after storing the produced adhesive tape in a thermostat at 200±3° C. for 30 minutes. In addition, when melting did not occur, it was judged to be acceptable, and when melting was made, it was judged to be unacceptable. Table 1 shows the above results.

(Example 2)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) described in Example 1 are calculated according to the weight ratio of 30/20/50/40/1/20/2 The ratio is mixed, and the content of the bromine element is changed to 20% by weight of the total amount of the resin composition comprising the polyolefin resin. Except for this, it carried out similarly to the said Example 1, and produced the film-form base material which has a thickness of 70 micrometers.

(making of adhesive)

In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer, and a stirring device, 100 parts by weight of 2-ethylhexyl acrylate, 2 parts by weight of acrylic acid, and benzoyl peroxide as a polymerization initiator were added to a toluene solvent. 0.2 parts by weight, it was made to react at 60 degreeC for 8 hours, and the polymer solution was obtained. Then, 3 parts by weight of a polyisocyanate crosslinking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name CORONATE L) was added to the polymer solution with respect to 100 parts by weight of the polymer solid content to prepare an acrylic adhesive.

(Production of Adhesive Tape)

Corona treatment was carried out on one side of the base material produced, and at the same time, the above-mentioned acrylic adhesive was coated with a reverse coater on the side of the base material, and dried in a constant temperature bath at 100° C. for 3 minutes. An acrylic adhesive layer with a thickness of 30 μm was formed on one surface of the material to produce an adhesive tape with a total thickness of 100 μm.

Then, flame retardancy evaluation, flexibility evaluation, mechanical strength evaluation, heat resistance evaluation, and thermal shock resistance evaluation were performed under the same conditions as in Example 1 above. Table 1 shows the above results.

(Example 3)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) described in Example 1 are calculated according to the weight ratio of 30/20/50/60/1/20/2 The proportion of mixed, and the content of the bromine element was changed to 26.8% by weight of the total amount of the resin composition comprising polyolefin resin. Except for this, it carried out similarly to the said Example 1, and produced the adhesive tape whose total thickness was 100 micrometers. Then, flame retardancy evaluation, flexibility evaluation, mechanical strength evaluation, heat resistance evaluation, and thermal shock resistance evaluation were performed under the same conditions as in Example 1 above. Table 1 shows the above results.

(Example 4)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) described in Example 1 are calculated according to the weight ratio of 30/20/50/90/1/20/2 The proportion of mixed, and the content of the bromine element was changed to 34.5% by weight of the total amount of the resin composition comprising polyolefin resin. In addition, an electron beam at an acceleration voltage of 300 kV up to 60 kGy was irradiated to the base material on the prepared film to cross-link the base material. Except for these, it carried out similarly to the said Example 2, and produced the adhesive tape whose total thickness was 100 micrometers. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. Table 1 shows the above results.

(Example 5)

As the brominated flame retardant described in Example 1, ethylene bistetrabromophthalimide (manufactured by Albemar Japan Co., Ltd., trade name Saytex BT93) was used instead of decabromodiphenylethane. Except for this, it carried out similarly to the said Example 1, and produced the film-form base material which has a thickness of 70 micrometers. Then, in the same manner as in Example 2, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 100 μm. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. Table 1 shows the above results.

(Example 6)

As the polyolefin resin, (1) linear low-density polyethylene resin (manufactured by Japan Unica Co., Ltd., trade name DFDJ7540, MFR=0.6g/10min (190°C, load 2.16kg), density 0.92g/cm ³ ), (2) low-density polyethylene resin (manufactured by Sumitomo Chemical Co., Ltd., trade name Sumikasen CH5, MFR=1.4g/10min (190°C, load 2.16kg), density 0.92g/cm ³ ), and (3 ) ethylene-vinyl acetate copolymer (manufactured by Mitsui-DuPont Polychemical Co., Ltd., trade name Evaflex EV360, MFR = 3 g/10 minutes (190° C., load 2.16 kg), vinyl acetate content = 25% by weight). In addition, (4) bromine-based flame retardant ethylene bistetrabromophthalimide (manufactured by Albemar Japan Co., Ltd., trade name Saytex BT93) was used as a halogen-based flame retardant. In addition, (5) antioxidant (manufactured by Ciba Seika Co., Ltd., brand name IRGANOX 1010), (6) antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.), and (7) zinc stearate were used. Then, the above-mentioned components (1) to (7) were mixed in a weight ratio of 30/20/50/80/1/20/2, and they were melted and kneaded by a mixer (open mixer). , was calendered with a calender roll set at 135° C. to produce a film-like substrate having a thickness of 70 μm. In addition, the content of the bromine element was 26.3% by weight of the total amount of the resin composition containing the polyolefin resin.

The substrate on the produced film was irradiated with an electron beam at an accelerating voltage of 300 kV to 60 kGy to crosslink the substrate. Then, in the same manner as in Example 2 above, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 100 μm. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. Table 1 shows the above results.

(Example 7)

As the polyolefin resin, (1) linear low-density polyethylene resin (manufactured by Japan Unica Co., Ltd., trade name DFDJ7540, MFR=0.6g/10min (190°C, load 2.16kg), density 0.92g/cm ³ ), (2) low-density polyethylene resin (manufactured by Sumitomo Chemical Co., Ltd., trade name Sumikasen CH5, MFR=1.4g/10min (190°C, load 2.16kg), density 0.92g/cm ³ ), and (3 ) ethylene-vinyl acetate copolymer (manufactured by Mitsui-DuPont Polychemical Co., Ltd., trade name Evaflex EV360, MFR = 3 g/10 minutes (190° C., load 2.16 kg), vinyl acetate content = 25% by weight).

In addition, (4) bromine-based flame retardant ethylene bistetrabromophthalimide (manufactured by Albemar Japan Co., Ltd., trade name Saytex BT93) was used as a halogen-based flame retardant. (5) antioxidant (manufactured by Ciba Seika Co., Ltd., brand name IRGANOX 1010), (6) antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.), and (7) zinc stearate were used. Then, the above-mentioned components (1) to (7) are mixed in a ratio of 30/20/50/135/1/20/2 in terms of weight ratio, and they are melted and kneaded by a kneader (open kneader) , was calendered with a calender roll set at 135° C. to produce a film-like substrate having a thickness of 70 μm. In addition, the content of the bromine element was 35% by weight of the total amount of the resin composition containing the polyolefin resin.

The substrate on the produced film was irradiated with an electron beam at an accelerating voltage of 300 kV to 60 kGy to crosslink the substrate. Then, in the same manner as in Example 2 above, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 100 μm. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. Table 1 shows the above results.

(Embodiment 8)

As the polyolefin resin, (1) polypropylene-based thermoplastic elastomer (manufactured by SunAllomer Co., Ltd., trade name Adflex Q100F, MFR = 0.45 g/10 minutes (230° C., load 2.16 kg), melting point 142° C.), (2) Atactic polypropylene resin (manufactured by Sumitomo Chemical Co., Ltd., trade name Noblen S131, MFR=1.2g/10min (230°C, load 2.16kg), density 0.89g/cm ³ ), and (3) ethylene-acetic acid Vinyl ester copolymer (manufactured by Mitsui-DuPont Polychemical Co., Ltd., trade name Evaflex EV360, MFR = 3 g/10 minutes (190° C., load 2.16 kg), vinyl acetate content = 25% by weight).

In addition, (4) brominated flame retardant decabromodiphenylethane (manufactured by Albemar Japan Co., Ltd., trade name Saytex 8010) was used as a halogen flame retardant. (5) antioxidant (manufactured by Ciba Seika Co., Ltd., brand name IRGANOX 1010), (6) antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.), and (7) zinc stearate were used. Then, the above-mentioned components (1) to (7) were mixed in a weight ratio of 40/40/20/28/1/20/2, and they were melted and kneaded by a mixer (open mixer). , was calendered with a calender roll set at 135° C. to produce a film-like substrate having a thickness of 110 μm. In addition, the content of the bromine element was 15.1% by weight of the total amount of the resin composition containing the polyolefin resin.

An electron beam at an acceleration voltage of 300 kV up to 120 kGy was irradiated to the base material on the produced film to cross-link the base material. Then, in the same manner as in Example 2 above, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. The above results are shown in Table 2.

(Example 9)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) described in Example 8 are calculated according to the weight ratio of 40/40/20/50/1/20/2 The proportion of mixed, and the content of the bromine element was changed to 23.6% by weight of the total amount of the resin composition comprising polyolefin resin. Except for this, it carried out similarly to the said Example 8, and produced the film-form base material which has a thickness of 110 micrometers. Then, in the same manner as in Example 1, a rubber-based adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. The above results are shown in Table 2.

(Example 10)

As the polyolefin resin, (1) polypropylene-based thermoplastic elastomer (manufactured by SunAllomer Co., Ltd., trade name Adflex Q100F, MFR = 0.45 g/10 minutes (230° C., load 2.16 kg), melting point 142° C.), (2) Atactic polypropylene polymerized by metallocene (manufactured by Nippon Polypropylene Co., Ltd., trade name WINTEC WFX6, MFR=2.0g/10min (230°C, load 2.16kg), density 0.9g/cm ³ ), and ( 3) Ethylene-vinyl acetate copolymer (manufactured by Mitsui-DuPont Polychemical Co., Ltd., trade name Evaflex EV360, MFR = 3 g/10 minutes (190° C., load 2.16 kg), vinyl acetate content = 25% by weight).

(4) Brominated flame retardant Decabromodiphenylethane (manufactured by Albemar Japan Co., Ltd., trade name Saytex 8010) was used as a halogen flame retardant. In addition, (5) antioxidant (manufactured by Ciba Seika Co., Ltd., brand name IRGANOX 1010), (6) antimony trioxide (Yamanaka Sangyo) and (7) zinc stearate were used. Then, the above-mentioned components (1) to (7) were mixed in a ratio of 40/40/20/30/1/20/2 in terms of weight ratio, and they were melted and kneaded by a mixer (open mixer). , was calendered with a calender roll set at 135° C. to produce a film-like substrate having a thickness of 110 μm. In addition, the content of the bromine element was 16% by weight of the total amount of the resin composition containing the polyolefin resin.

An electron beam at an acceleration voltage of 300 kV up to 120 kGy was irradiated to the base material on the produced film to cross-link the base material. Then, in the same manner as in Example 2 above, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. The above results are shown in Table 2.

(Example 11)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) explained in Example 10 are calculated according to the weight ratio of 40/40/20/70/1/20/2 The ratio of mixing, the content of the bromine element is changed to 29.6% by weight of the total amount of the resin composition comprising the polyolefin resin, and the substrate on the film made is irradiated with an electron beam with an accelerating voltage of 300kV to 60kGy, so that the substrate is exchanged Except for these, it was carried out in the same manner as in Example 10 above to produce an adhesive tape with a total thickness of 140 μm. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. The above results are shown in Table 2.

(Example 12)

As the polyolefin resin, (1) ethylene-ethyl acrylate copolymer (manufactured by Japan Unica Co., Ltd., trade name NUC6510, MFR = 0.5 g/10 minutes (190°C, load 2.16 kg), ethyl acrylate content = 23% by weight), and (2) styrene-based elastomer (manufactured by Kuraray Co., Ltd., trade name SEPTON 4033, MFR=0.1g/10min (230°C, load 2.16kg), styrene content=30% by weight) . In addition, as a halogen-based flame retardant, (3) brominated flame retardant decabromodiphenylethane (manufactured by Albemar Japan Co., Ltd., trade name Saytex 8010) was used. In addition, (4) antioxidant (manufactured by Ciba Seika Co., Ltd., brand name IRGANOX 1010), (5) antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.), and (6) zinc stearate were used. Then, the above-mentioned components (1)-(6) were mixed according to the ratio of 60/40/40/1/20/2 in weight ratio, and after they were melted and kneaded by a kneader (open kneader), they were mixed with A calender roll set at 135° C. was calendered to produce a film-shaped substrate having a thickness of 110 μm. In addition, the content of the bromine element was 20% by weight of the total amount of the resin composition containing the polyolefin resin.

An electron beam at an acceleration voltage of 300 kV up to 120 kGy was irradiated to the base material on the produced film to cross-link the base material. Then, in the same manner as in Example 2 above, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. The above results are shown in Table 2.

(Example 13)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1)-(6) described in Example 12 are in the ratio of 60/40/90/1/20/2 by weight Mixing was performed to change the content of the bromine element to 34.5% by weight of the total amount of the resin composition containing the polyolefin resin. In addition, an electron beam at an acceleration voltage of 300 kV up to 60 kGy was irradiated to the base material on the prepared film to cross-link the base material. Except for these, it carried out similarly to the said Example 12, and produced the adhesive tape whose total thickness was 140 micrometers. Then, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed under the same conditions as in Example 1 above. The above results are shown in Table 2.

(Example 14)

(1) Styrene-ethylene-butylene-styrene copolymer (manufactured by Asahi Kasei Chemical Co., Ltd., trade name Tuftec H1041, MFR=5.0g/10min (230°C, load 2.16kg)) as a styrene-based elastomer, (2) Atactic polypropylene resin (manufactured by Sumitomo Chemical, trade name NOBRENES131, MFR=1.2g/10min (230°C, load 2.16kg), density 0.89g/cm ³ ) blended as a styrene-based elastomer polyolefin resin. In addition, as a halogen-based flame retardant, (3) brominated flame retardant decabromodiphenylethane (manufactured by Albemar Japan Co., Ltd., trade name Saytex 8010) was used.

(4) antioxidant (manufactured by Ciba Seika Co., Ltd., trade name IRGANOX1010), (5) antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.), (6) zinc stearate, and (7) trimethylol Propane trimethacrylate. Then, the above-mentioned components (1) to (7) were mixed in a ratio of 60/40/40/1/20/2/2 in terms of weight ratio, and they were melted and kneaded by a mixer (open mixer). , was calendered with a calender roll set at 135° C. to produce a film-like substrate having a thickness of 110 μm. In addition, content of bromine element was 19.1 weight% of the resin composition whole quantity.

Electron beams with an acceleration voltage of 300 kV up to 240 kGy were irradiated to the prepared film-like substrate to crosslink the substrate. Then, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as above. The results are shown in Table 3.

(Example 15)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) described in Example 14 are 60/40/70/1/20/2/2 in weight ratio Mixed in the ratio of the bromine element to change the content of the bromine element to 29.5% by weight of the total amount of the resin composition containing the styrene-based elastomer. Except for this, in the same manner as in Example 14, a film-shaped base material having a thickness of 110 μm was produced. However, the amount of electron beam irradiation was 120 kGy. Then, in the same manner as in Example 1, a rubber-based adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as those described above. The results are shown in Table 3.

(Example 16)

Using (1) hydrogenated styrene-butadiene copolymer (manufactured by Asahi Kasei Chemical Co., Ltd., trade name SOE-SS9000, MFR=2.7g/10min (230°C, load 2.16kg)) as a styrene-based elastomer, use (2) Atactic polypropylene resin polymerized by metallocene (manufactured by Nippon Polypropylene Co., Ltd., trade name WINTEC WFX6, MFR=2.0g/10min (230°C, load 2.16kg), density 0.9g/ ^cm3 ) as a polyolefin resin blended with a styrene-based elastomer.

In addition, as a halogen-based flame retardant, (3) brominated flame retardant decabromodiphenylethane (manufactured by Albemar Japan Co., Ltd., trade name Saytex 8010) was used. In addition, (4) antioxidant (manufactured by Ciba Seika Co., Ltd., trade name IRGANOX1010), (5) antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.), (6) zinc stearate, and (7) trimethylol Propane trimethacrylate. Then, the above-mentioned components (1)-(7) are mixed according to the ratio of 70/30/28/1/20/2/2 in terms of weight ratio, and after melting and kneading by a mixer (open mill), use A calender roll set at 135° C. was calendered to produce a film-shaped substrate having a thickness of 110 μm. In addition, the content of bromine element was 15.0% by weight.

Electron beams with an acceleration voltage of 300 kV up to 240 kGy were irradiated to the prepared film-like substrate to crosslink the substrate. Then, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as those described above. The results are shown in Table 3.

(Example 17)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) described in Example 16 are calculated according to the weight ratio of 70/30/70/1/20/2/2 The ratio of mixing, the content of the bromine element was changed to 32% by weight of the total amount of the resin composition containing the styrene-based elastomer. Except for this, in the same manner as in Example 16, a film-shaped base material having a thickness of 110 μm was produced. However, the amount of electron beam irradiation was 120 kGy. Then, in the same manner as in Example 1, a rubber-based adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as those described above. The results are shown in Table 3.

(comparative example 1)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) described in Example 1 are calculated according to the weight ratio of 30/20/50/25/1/20/2 The proportion of mixed, the content of the bromine element was changed to 13.8% by weight of the total amount of the resin composition containing the polyolefin resin, and the thickness of the substrate was changed to 80 μm. Except for this, it carried out similarly to Example 2, and produced the adhesive tape whose total thickness was 110 micrometers. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as in Example 1. The above results are shown in Table 4.

(comparative example 2)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) described in Example 1 are calculated according to the weight ratio of 30/20/50/95/1/20/2 Mixed in the ratio of the bromine element to change the content of the bromine element to 35.6% by weight of the total amount of the resin composition comprising the polyolefin resin. In addition, the substrate on the prepared film was irradiated with an electron beam at an acceleration voltage of 300 kV up to 60 kGy to crosslink the substrate and change the thickness of the substrate to 80 μm. Except for these, it carried out similarly to Example 2, and produced the adhesive tape whose total thickness was 110 micrometers. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as in Example 1. The above results are shown in Table 4.

(comparative example 3)

Using ethylene bistetrabromophthalimide (manufactured by Albemar Japan Co., Ltd., trade name SaytexBT93) instead of decabromodiphenylethane as a brominated flame retardant used in Example 10, the Example Components (1) to (7) described in 10 were mixed at a ratio of 40/40/20/30/1/20/2 by weight, and the content of bromine element was changed to the total amount of the resin composition containing polyolefin resin. 13% by weight of the amount, the thickness of the substrate was changed to 80 μm. Except for this, it carried out similarly to Example 10, and produced the adhesive tape whose total thickness was 110 micrometers. Then, under the same conditions as in Example 1, evaluations of flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were performed. The above results are shown in Table 4.

(comparative example 4)

Change the mixing amount of the brominated flame retardant ethylene bis-tetrabromophthalimide described in the above comparative example 3, and the components (1) to (7) described in the comparative example 3 are adjusted to 30% by weight. /20/50/140/1/20/2 are mixed, the content of bromine element is changed to 35.6% by weight of the total amount of the resin composition comprising polyolefin resin, and the acceleration voltage is irradiated to the base material on the film made Electron beam at 300kV to 60kGy to crosslink the substrate. Except for this, it carried out similarly to the comparative example 3, and produced the adhesive tape whose total thickness was 110 micrometers. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as in Example 1. The above results are shown in Table 4.

(comparative example 5)

Change the mixing amount of the brominated flame retardant ethylene bis-tetrabromophthalimide described in the above comparative example 3, and the components (1) to (7) described in the comparative example 3 are adjusted to 30% by weight. /20/50/98/1/20/2 were mixed, the content of bromine was changed to 35.6% by weight of the total amount of the resin composition containing polyolefin resin, and electron beams were not irradiated to the base material on the produced film. The substrate is not crosslinked. Except for this, it carried out similarly to the comparative example 3, and produced the adhesive tape whose total thickness was 110 micrometers. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as in Example 1. The above results are shown in Table 4.

(comparative example 6)

Using (1) hydrogenated styrene-butadiene copolymer (manufactured by Asahi Kasei Chemical Co., Ltd., trade name SOE-SS9000, MFR=2.7g/10min (230°C, load 2.16kg)) as a styrene-based elastomer, use (2) Atactic polypropylene resin polymerized by metallocene (manufactured by Nippon Polypropylene Co., Ltd., trade name WINTEC WFX6, MFR=2.0g/10min (230°C, load 2.16kg), density 0.9g/ ^cm3 ) as a polyolefin resin blended with a styrene-based elastomer.

In addition, as a halogen-based flame retardant, (3) brominated flame retardant decabromodiphenylethane (manufactured by Albemar Japan Co., Ltd., trade name Saytex 8010) was used. In addition, (4) antioxidant (manufactured by Ciba Seika Co., Ltd., trade name IRGANOX1010), (5) antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.), (6) zinc stearate, and (7) trimethylol Propane trimethacrylate. Then, the above-mentioned components (1)-(7) are mixed according to the ratio of 70/30/25/1/20/2/2 in terms of weight ratio, and after melting and kneading by a kneader (open mill), use A calender roll set at 135° C. was calendered to produce a film-shaped substrate having a thickness of 110 μm. The content of bromine element was 13.7% by weight.

Electron beams with an acceleration voltage of 300 kV up to 240 kGy were irradiated to the prepared film-like substrate to crosslink the substrate. Then, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as those described above. The results are shown in Table 5.

(comparative example 7)

Change the mixing amount of the above-mentioned brominated flame retardant decabromodiphenylethane, and the components (1) to (7) explained in Example 16 are calculated according to the weight ratio of 70/30/95/1/20/2/2 Mixed in the ratio of the bromine element to change the content of the bromine element to 35.4% by weight of the total amount of the resin composition containing the styrene-based elastomer. Except for this, in the same manner as in Comparative Example 6, a film-shaped base material having a thickness of 110 μm was produced. However, the irradiation amount of the electron beam was 120 kGy. Then, in the same manner as in Example 1, a rubber-based adhesive layer with a thickness of 30 μm was formed on one surface of the substrate to produce an adhesive tape with a total thickness of 140 μm. Then, flame retardancy, flexibility, mechanical strength, heat resistance, and thermal shock resistance were evaluated under the same conditions as those described above. The results are shown in Table 5.

Table 1

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Bromine content (weight%) 15.1 20.0 26.8 34.5 15.1 26.3 35.0 Electron beam exposure (kGy) 120 120 120 60 120 60 60 Limiting Oxygen Index 24.0 25.0 25.5 24.0 24.0 25.5 24.0 Tensile strength (N) 43 40 35 32 41 32 30 Elongation(%) 170 150 140 130 160 145 130 Tensile strength after 168 hours (N) 40 38 30 130 35 30 30 Elongation after 168 hours (%) 160 145 128 120 155 137 120 Thermal Shock Resistance qualified qualified qualified qualified qualified qualified qualified

Table 2

Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Bromine content (weight%) 15.1 23.6 16.0 29.6 20.0 34.5 Electron beam exposure (kGy) 120 120 120 60 120 60 Limiting Oxygen Index 24.0 25.0 24.5 25.0 24.0 24.5 Tensile strength (N) 30 31 36 34 41 35 Elongation(%) 150 130 160 140 180 160 Tensile strength after 168 hours (N) 32 31 37 34 37 32 Elongation after 168 hours (%) 137 120 145 130 150 135 Thermal Shock Resistance qualified qualified qualified qualified qualified qualified

table 3

Substrate thickness 110μm Example 14 Example 15 Example 16 Example 17 Bromine content (weight%) 19.1 29.5 15 32 Electron beam exposure (kGy) 240 120 240 120 Limiting Oxygen Index 27 26.5 26 26.5 Tensile strength (N) 40 36 38 33 Elongation(%) 340 320 380 330 Tensile strength after 168 hours (N) 38 35 40 34 Elongation after 168 hours (%) 320 310 350 320 Thermal Shock Resistance no melting no melting no melting no melting

Table 4

Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative Example 5 Bromine content (weight%) 13.8 35.6 13.0 35.6 29.6 Electron beam exposure (kGy) 120 60 120 60 0 Limiting Oxygen Index 23.0 22.5 22.5 22.5 25.0 Tensile strength (N) 45 29 37 29 29 Elongation(%) 180 120 145 110 170 Tensile strength after 168 hours (N) 42 30 37 30 30 Elongation after 168 hours (%) 150 98 120 90 130 Thermal Shock Resistance qualified qualified qualified qualified unqualified

table 5

Substrate thickness 110μm Comparative example 6 Comparative example 7 Bromine content (weight%) 13.7 35.4 Electron beam exposure (kGy) 240 120 Limiting Oxygen Index twenty three twenty two Tensile strength (N) 41 31 Elongation(%) 430 100 Tensile strength after 168 hours (N) 38 31 Elongation after 168 hours (%) 380 85 Thermal Shock Resistance no melting no melting

As shown in Tables 1 to 3, the limiting oxygen index (LOI value) in any of the adhesive tapes of Examples 1 to 17 was 23.5 or more, and it was judged that the flame retardancy was excellent. In addition, in any of the pressure-sensitive adhesive tapes of Examples 1 to 17, the tensile strength was 29.4 N or more, and the elongation was 125% or more, and it was judged that the mechanical strength and flexibility were excellent. In addition, in any case of the adhesive tapes of Examples 1 to 17, after storage at 120±2° C. for 168 hours, the tensile strength after natural cooling at room temperature for 30 minutes or more was 29.4 N or more, and the elongation was 100% or more, and no melting occurred in the thermal shock resistance evaluation, and it was judged to have excellent heat resistance.

On the other hand, in any of the adhesive tapes of Comparative Examples 1 to 4 shown in Table 4 and the adhesive tapes of Comparative Examples 6 and 7 shown in Table 5, the limiting oxygen index (LOI value) was less than 23.5. , it is judged that the flame retardancy is poor. In addition, in either of Comparative Examples 2 and 4, the tensile strength was less than 29.4N, and the elongation was less than 125%, and it was judged that the mechanical strength and flexibility were poor. In addition, in either of Comparative Examples 2 and 4, after storage at 120±2° C. for 168 hours, the elongation after natural cooling at room temperature for 30 minutes or more was less than 100%, and the heat resistance was judged to be poor. Moreover, as shown in Table 4, the tensile strength of the pressure-sensitive adhesive tape of Comparative Example 5 was less than 29.4N, and it was judged that the mechanical strength was inferior. In addition, the pressure-sensitive adhesive tape of Comparative Example 5 melted in the thermal shock resistance evaluation, and was judged to be poor in heat resistance. For Comparative Examples 1 to 4 and Comparative Examples 6 and 7, it is considered that the content of bromine element relative to the total amount of the resin composition containing polyolefin resin or styrene-based elastomer is 15% by weight to 10% by weight in any case. In Comparative Example 5, the range outside the range of 35% by weight is considered to be because the produced film-shaped base material was not irradiated with electron beams and the base material was not crosslinked.

Industrial Utilization Possibility

An example of an application of the present invention includes an adhesive tape having flame retardancy, flexibility, and mechanical strength used in a wire harness for automobiles and the like.

Claims (6)

1. self adhesive tape is characterized in that possessing:

Have 50～200 μ m thickness base material and

Have 10～50 μ m thickness and be arranged on binder layer at least one face of described base material,

Described base material is made of the resin combination that contains polyolefin resin and halogen fire retardant, and contains halogen element with the ratio of the 15 weight %～35 weight % of described resin combination total amount.

2. self adhesive tape as claimed in claim 1 is characterized in that described resin combination also contains the styrenic elastomerics, and the elastomeric content of styrenic is more than the content of polyolefin resin.

3. self adhesive tape as claimed in claim 1 is characterized in that, described resin combination only contains the mother metal of polyolefin resin as the halogen fire retardant.

4. as each described self adhesive tape in the claim 1～3, it is characterized in that described halogen fire retardant is at least a kind that is selected from clorafin, chlorinatedpolyethylene, chlorinated polyphenyl, perchloropentacyclodecane, TDE, the two tetrabromo phthalimides of ethylene, brominated Polystyrene, PBDE, hexabromobenzene, hexabromocyclododecane, ten tetrabromos, the two phenoxy group benzene.

5. as claim 3 or 4 described self adhesive tapes, it is characterized in that described resin combination has carried out crosslinking Treatment.

6. self adhesive tape as claimed in claim 5 is characterized in that described crosslinking Treatment is undertaken by the irradiation of ionizing radiation.

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