JP2006137883A - Film substrate and adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prepare an adhesive tape produced by using a film that is produced by using a non-halogen resin composition as a raw material, which solves problems concerning plasticity, manual cutting performance, and antiwear quality when the tape is used for binding complicated wires and cables in the engine room of a car, or the like. <P>SOLUTION: A film substrate or the adhesive tape contains, based on 100 pts.mass of an aromatic vinyl elastomer, 10 to 60 pts.mass of a styrene resin, 1 to 50 pts.mass of a maleimide copolymer prepared by polymerization of a 15 to 70 mass% aromatic vinyl monomer and a 30 to 85 mass% unsaturated dicarboxylic acid imide derivative, and 1 to 50 pts.mass of a nitrile copolymer prepared by polymerization of a 40 to 85 mass% aromatic vinyl monomer and a 15 to 40 mass% vinylcyanide monomer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a film substrate and an adhesive tape using the film substrate. Units such as “parts” and “%” indicating the composition of the present invention are displayed on a mass basis unless otherwise specified.

In addition to vehicles such as automobiles, trains, etc., in various adhesive tape fields such as insulating tapes used in electrical equipment such as aircraft, ships, houses, factories, etc., it has moderate flexibility and extensibility, flame resistance, machinery A film made from a resin composition containing a vinyl halide resin such as polyvinyl chloride because it is excellent in terms of mechanical strength, heat distortion resistance, electrical insulation and moldability, and is relatively inexpensive. Have been used. Since such a halogenated vinyl resin film generates a toxic gas when incinerated, recently, a metal hydroxide (eg, magnesium hydroxide, aluminum hydroxide, etc.) having a low environmental impact on the polyolefin resin is used. A film using a non-halogen resin composition containing a large amount of an inorganic flame retardant composed of an inorganic metal compound as a raw material has begun to be used.

As an adhesive tape using a film made of such a non-halogen resin composition as a raw material, an adhesive tape characterized by using a composition containing an olefin polymer and an inorganic flame retardant as a film substrate is known. (For example, Patent Document 1).
JP 2001-192629 A

An object of the present invention is to provide a film base material having all properties of flexibility, hand cutting property, heat resistance and wear resistance in a well-balanced manner, and an adhesive tape using the film base material.

That is, the present invention includes 10 to 60 parts by mass of a styrene resin, 1 to 50 parts by mass of a maleimide copolymer, and 1 to 50 parts by mass of a nitrile copolymer with respect to 100 parts by mass of an aromatic vinyl elastomer. It is a film substrate. Further, the aromatic vinyl elastomer comprises a styrene-butadiene random copolymer, a styrene-butadiene block copolymer, a hydrogenated styrene-butadiene random copolymer, and a hydrogenated styrene-butadiene block copolymer. It is preferably at least one compound selected from the group. Furthermore, the styrene resin is preferably a polystyrene resin (GPPS) or rubber reinforced polystyrene (HIPS). The maleimide copolymer is obtained by polymerizing 15 to 70% by mass of an aromatic vinyl monomer and 30 to 85% by mass of an unsaturated dicarboxylic imide derivative. The saturated dicarboxylic acid imide derivative is preferably N-phenylmaleimide. Further, the nitrile copolymer is obtained by polymerizing 40 to 85% by mass of an aromatic vinyl monomer and 15 to 40% by mass of a vinyl cyanide monomer, and the nitrile copolymer is styrene or vinyl cyanide. It is preferred that the monomer is acrylonitrile. Furthermore, it is preferable that 1-200 mass parts of inorganic fillers are included in a film base material. Furthermore, the inorganic filler is preferably at least one compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, hydrotalcite, and magnesium carbonate. Moreover, it is preferable to crosslink by irradiating an electron beam to a film base material. Furthermore, it is the adhesive tape which formed the adhesive layer on the single side | surface of a film base material. Moreover, it is an adhesive tape for binding using an adhesive tape. On the other hand, this invention is a manufacturing method of the film base material which calendar-processes a film base material at the roll temperature of 150-220 degreeC.

The pressure-sensitive adhesive tape using the film substrate of the present invention can provide a pressure-sensitive adhesive tape excellent in flexibility, hand cutting, heat resistance and wear resistance.

The aromatic vinyl-based elastomer that can be used for the film substrate of the present invention comprises an aromatic vinyl hydrocarbon polymer block and an elastomeric polymer block, and the aromatic vinyl hydrocarbon polymer block is hard. The segment is composed of an elastomeric polymer block and a soft segment. Typically, a copolymer represented by an aromatic vinyl hydrocarbon polymer block-elastomeric polymer block or an aromatic vinyl hydrocarbon polymer block-elastomeric polymer block-aromatic vinyl hydrocarbon polymer block. A block copolymer having a polymer structure and in which the double bonds of the elastomeric polymer block may be partially or completely hydrogenated, and is generally known as a styrene elastomer.

Examples of the aromatic vinyl hydrocarbon include styrene, α-methyl styrene, o-, m-, and p-methyl styrene, 1,3-dimethyl styrene, vinyl naphthalene, vinyl anthracene, etc. Among them, styrene is preferable. In addition, the elastomeric polymer block may be conjugated diene type or other than conjugated diene type as long as it exhibits elastomeric properties, but generally conjugated diene type is preferable. Examples of the conjugated diene in this case include butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene and the like.

Examples of aromatic vinyl elastomers include styrene-ethylene / butylene copolymer-styrene (SEBS), styrene-ethylene / propylene copolymer-styrene (SEPS), styrene-butadiene-styrene (SBS), and styrene-isoprene-styrene. (SIS) ABA type block copolymers, random copolymers, hydrogenated products of these ABA type block copolymers and random copolymers, styrene-butadiene copolymers And AB block copolymers such as styrene-isoprene copolymers, random copolymers, and hydrogenated products of these AB block copolymers and random copolymers. Preferably, a styrene-butadiene random copolymer, a styrene-butadiene block copolymer, a hydrogenated product of a styrene-butadiene random copolymer, or a hydrogenated product of a styrene-butadiene block copolymer is preferable. More preferably, a completely hydrogenated product of a styrene-butadiene random copolymer having a low elongation at break is preferred.

The styrene resin that can be used for the film substrate of the present invention is a styrene homopolymer, a copolymer of styrene and a monomer copolymerizable with the styrene, or styrene in the presence of a rubbery polymer. Styrene and one or more monomers copolymerizable with styrene are (co) polymerized. Monomers copolymerizable with styrene include α-substituted styrene such as α-methylstyrene, aromatic ring-substituted styrene such as vinyltoluene, t-butylstyrene, chlorostyrene, bromostyrene, dibromostyrene, and tribromostyrene. , Vinyl cyanide monomers such as acrylonitrile and methacrylonitrile, acrylic esters such as methyl acrylate and ethyl acrylate, methacrylic esters such as methyl methacrylate and ethyl methacrylate, vinyl carboxyl such as acrylic acid and methacrylic acid Unsaturated carboxylic acid amides such as acid, acrylic acid amide, methacrylic acid amide, unsaturated dicarboxylic acid imide derivatives such as maleimide, N-phenylmaleimide, N-cyclohexylmaleimide, and unsaturated dicarboxylic acids such as maleic acid, itaconic acid, citraconic acid Acid anhydride However, it is not limited to these.

The styrenic resin is not particularly limited, and a commonly used known resin can be used. Specifically, a polystyrene resin called GPPS or a rubber-reinforced polystyrene resin called HIPS is mentioned, and a polystyrene resin that can easily adjust the film strength by controlling the molecular weight is preferable.

The blending amount of the styrene resin is 10 to 60 parts by mass, preferably 10 to 40 parts by mass with respect to 100 parts by mass of the aromatic vinyl elastomer. When the styrene-based resin is less than 10 parts by mass, the strength of the film substrate is low and the film is easily stretched. On the other hand, when the styrene resin exceeds 60 parts by mass, the workability of the film base material is lost, and the film base material becomes rigid and the pinhole resistance is lowered.

The maleimide copolymer that can be used for the film substrate of the present invention is obtained by polymerizing 15 to 70% by mass of an aromatic vinyl monomer and 30 to 85% by mass of an unsaturated dicarboxylic imide derivative. More preferably, the aromatic vinyl monomer is 15 to 70% by mass, the unsaturated dicarboxylic imide derivative is 25 to 65% by mass, the unsaturated dicarboxylic acid anhydride is 0.1 to 25% by mass, and a vinyl monomer copolymerizable therewith. It is formed by polymerizing 0.1 to 40% by mass of a monomer. If the aromatic vinyl monomer content is less than 15% by mass or the unsaturated dicarboxylic acid imide derivative exceeds 85% by mass, the difference in melt viscosity from the aromatic vinyl-based elastomer increases, resulting in poor melt mixing and moldability of the film substrate. Decreases. On the other hand, if the aromatic vinyl monomer exceeds 70% by mass or the unsaturated dicarboxylic imide derivative is less than 30% by mass, the effect of imparting heat resistance as a film substrate is deteriorated.

The weight average molecular weight of the maleimide copolymer is preferably 60,000 to 140,000, more preferably 80,000 to 120,000. When the weight average molecular weight of the maleimide copolymer is less than 60,000 or more than 140,000, the heat resistance deteriorates and the fluidity of the resin during processing deteriorates.

Examples of the aromatic vinyl monomer constituting the maleimide copolymer include styrenes such as styrene, α-methylstyrene, vinyltoluene, ethylstyrene, and t-butylstyrene, and substituted products thereof. Preferably, it is styrene that facilitates numerical control of the molecular weight increased by the reaction.

Unsaturated dicarboxylic acid imide derivatives comprising maleimide copolymers are maleimide monomers such as maleimide, N-methylmaleimide, N-ethylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide, N-naphthylmaleimide Is mentioned. N-phenylmaleimide having high heat resistance is preferable.

Examples of the unsaturated dicarboxylic acid anhydride that constitutes the maleimide copolymer include anhydrides such as maleic acid, itakotanic acid, citraconic acid, and aconitic acid. Preferably, it is maleic anhydride that facilitates numerical control of the molecular weight that is increased by the reaction.

Vinyl monomers copolymerizable with unsaturated dicarboxylic acid anhydrides include, for example, vinyl cyanides such as acrylonitrile and methacrylonitrile, acrylic esters such as methyl acrylate, ethyl acrylate and butyl acrylate, methyl methacrylate and ethyl Methacrylic acid esters such as methacrylate, and vinyl carboxylic acids such as acrylic acid and methacrylic acid.

Maleimide-based copolymers can be directly copolymerized using these aromatic vinyl monomers and unsaturated dicarboxylic imide monomers, and if necessary, unsaturated dicarboxylic acid anhydrides and / or vinyl monomers. The unsaturated dicarboxylic acid anhydride monomer may be copolymerized with an aromatic vinyl monomer and, if necessary, a vinyl monomer copolymerizable with these monomers, and then ammonia and / or Alternatively, it may be reacted with a primary amine to form an imide monomer. However, as a method for producing these copolymers, the latter, that is, a method in which an unsaturated dicarboxylic acid anhydride monomer is copolymerized with an aromatic vinyl monomer and then imidized, is copolymerizable and economical. More preferable in terms.

Ammonia and primary amine used in the latter imidation reaction may be either anhydrous or in an aqueous solution. Examples of primary amines include alkylamines such as methylamine, ethylamine, cyclohexylamine, and / or Aromatic amines such as aniline, toluidine and naphthylamine can be mentioned.

When the imidation reaction is carried out in a solution state or suspension state, it is preferable to use an ordinary reaction vessel, such as an autoclave, and when it is carried out in a bulk molten state, an extruder equipped with a devolatilizer may be used. .

The temperature of the imidization reaction is about 80 to 350 ° C, preferably 100 to 300 ° C. When the temperature is lower than 80 ° C., the reaction rate is slow, and the reaction takes a long time and is not practical. On the other hand, when it exceeds 350 ° C., physical properties are deteriorated due to thermal decomposition of the polymer. A catalyst may be used during the imidation reaction. In that case, a tertiary amine such as triethylamine is preferably used.

The blending amount of the maleimide copolymer is preferably 1 to 50 parts by mass with respect to 100 parts by mass of the aromatic vinyl elastomer. Preferably it is the range of 10-35 mass parts. When the maleimide copolymer is less than 1 part by mass, the thermal shrinkage of the film substrate is worsened. On the other hand, when it exceeds 50 mass parts of maleimide-type copolymers, there exists a problem that the workability of a film base material will worsen.

The nitrile copolymer that can be used for the film substrate of the present invention is a polymer of an aromatic vinyl monomer and a nitrile group-containing vinyl cyanide monomer, and the production method is not particularly limited. For example, polymerization methods such as emulsion polymerization, suspension polymerization, bulk polymerization, and solution polymerization can be employed. Further, any polymerization method of batch method or continuous method may be used. This copolymer is obtained by polymerizing 40 to 85% by mass of an aromatic vinyl monomer and 15 to 40% by mass of a vinyl cyanide monomer. More preferably, an aromatic vinyl monomer mass of 50 to 80% and a vinyl cyanide monomer mass of 20 to 30% are polymerized. When the aromatic vinyl monomer exceeds 85% by mass or less than 40% by mass, or when the vinyl cyanide monomer exceeds 40% by mass or less than 15% by mass, the maleimide copolymer The compatibility with the polymer is deteriorated, and the extrusion stability is lowered during melt mixing.

The weight average molecular weight of the nitrile copolymer is 50,000 to 110,000, more preferably 70,000 to 90,000. When the weight average molecular weight is less than 50,000, or when it exceeds 110,000, the compatibility with the maleimide copolymer is deteriorated.

The weight average molecular weight of the nitrile copolymer is adjusted using a known chain transfer agent. Examples of chain transfer agents include mercaptans such as n-dodecyl mercaptan, t-dodecyl mercaptan, n-octyl mercaptan, terpenes such as dipentene and terpinolene, halogenated hydrocarbons such as chloroform and broroform, α-methylstyrene dimer, etc. In particular, mercaptans are preferable.

Examples of the aromatic vinyl monomer of the nitrile copolymer include styrene, α-methyl styrene, vinyl toluene, ethyl styrene, t-butyl styrenes, and substituted products thereof as in the case of the maleimide copolymer. Of these, styrene is particularly preferred.

Examples of the vinyl cyanide monomer of the nitrile copolymer include acrylonitrile and methacrylonitrile, and acrylonitrile is particularly preferable.

As the vinyl monomer copolymerizable with the aromatic vinyl monomer and the vinyl cyanide monomer, as in the case of the maleimide copolymer, acrylic esters such as methyl acrylate, ethyl acrylate and butyl acrylate And methacrylic acid esters such as methyl methacrylate and ethyl methacrylate, and vinyl carboxylic acids such as acrylic acid and methacrylic acid.

The blending amount of the nitrile copolymer is 1 to 50 parts by mass, preferably 10 to 30 parts by mass with respect to 100 parts by mass of the aromatic vinyl elastomer. If the nitrile copolymer is less than 1 part by mass, the maleimide copolymer does not melt and there is a problem of poor film processability. On the other hand, when the nitrile copolymer exceeds 50 parts by mass, there is a problem that heat shrinkage is deteriorated.

The reason for blending inorganic fillers is to improve the hand cutting property of the film base material, while increasing the heat conduction during the molding process to increase the cooling effect of the film base material and to suppress the distortion generated in the film base material. Because. The average particle diameter of the inorganic filler is, for example, 20 μm or less, preferably 10 μm or less. When the average particle size is less than 0.5 μm, workability and hand cutting properties may be deteriorated. On the other hand, when the average particle diameter exceeds 10 μm, the tensile strength and breaking elongation of the film base material may be lowered, and the flexibility may be lowered and pinholes may be generated. The average particle diameter is an average particle diameter measured by a laser diffraction method.

Examples of inorganic fillers include aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, calcium hydroxide, potassium hydroxide, barium hydroxide, triphenyl phosphite, ammonium polyphosphate, polyphosphate amide, zirconium oxide and magnesium oxide. , Zinc oxide, titanium oxide, molybdenum oxide, guanidine phosphate, hydrotalcite, snakerite, zinc borate, anhydrous zinc borate, zinc metaborate, barium metaborate, antimony oxide, antimony trioxide, antimony pentoxide, red phosphorus, Talc, alumina, silica, boehmite, bentonite, sodium silicate, calcium silicate, calcium sulfate, calcium carbonate, and magnesium carbonate, and one or more compounds selected from these are used. In particular, the use of at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, hydrotalcite, and magnesium carbonate is excellent in flame retardancy and is economically advantageous.

The compounding quantity of an inorganic filler is 1-200 mass parts with respect to 100 mass parts of aromatic vinyl-type elastomers, Preferably it is the range of 5-100 mass parts. When the inorganic filler is less than 1 part by mass, the flame retardancy of the film substrate may be inferior. On the other hand, when the inorganic filler exceeds 200 parts by mass, mechanical properties such as moldability and strength of the film substrate may be inferior.

When an inorganic filler is blended as a non-halogen flame retardant, the char (carbonized layer) can be formed and the flame retardancy of the film substrate can be improved.

A colorant, an antioxidant, an ultraviolet absorber, a lubricant, a stabilizer, and other additives can be blended with the film base as needed, as long as the effects of the present invention are not impaired.

The means for forming the film substrate is not particularly limited, but the above-mentioned various materials can be mixed with conventional melt-kneading and various mixing devices (single- or twin-screw extruder, roll, Banbury mixer, various kneaders, etc.). It is obtained by mixing the components so that they are uniformly dispersed, forming the mixture into a film by a calendering machine, and cutting it to a desired tape width. As the roll arrangement method in calendar molding, for example, a known method such as L-type, reverse L-type, and Z-type can be adopted, and the roll temperature is usually set in the range of 150 to 220 ° C, preferably 160 to 200 ° C. .

The thickness in particular of a film base material is not restrict | limited, For example, it is 40-500 micrometers, Preferably it is 70-200 micrometers, More preferably, it is 80-160 micrometers. In addition, the film base material may have a single layer form or may have a multiple layer form. For example, in order to cope with the operation of winding an adhesive tape around an electric wire having various forms, the winding workability may be reduced when the thickness of the film substrate is increased.

By irradiating the film base material with an electron beam and crosslinking, the film base material can be prevented from being deformed or contracted when placed under a high temperature, and the temperature dependency can be reduced. In this case, the irradiation amount of the electron beam is preferably in the range of 10 to 150 Mrad (mega rad). The range of 15 to 25 Mrad is preferable. If the irradiation amount is less than 10 Mrad, the temperature dependency is not improved. On the other hand, when the irradiation amount exceeds 150 Mrad, the film base material is deteriorated by the electron beam, which may cause a problem in workability in post-processing.

A cross-linking agent for promoting electron beam cross-linking may be added. Specific examples of the crosslinking agent include low molecular weight compounds and oligomers having at least two carbon-carbon double bonds in the molecule, such as acrylate compounds, urethane acrylate oligomers, and epoxy acrylate oligomers.

An adhesive layer may be formed on one side of the film substrate. As a pressure-sensitive adhesive for constituting the pressure-sensitive adhesive layer, a commonly used pressure-sensitive adhesive can be used as appropriate, and for example, a rubber-based pressure-sensitive adhesive or an acrylic pressure-sensitive adhesive can be used. Moreover, in order to make these adhesives have desirable performance, tackifiers, anti-aging agents, curing agents and the like can be blended.

As the base polymer of the rubber adhesive, natural rubber, recycled rubber, silicone rubber, isoprene rubber, styrene butadiene rubber, polyisoprene, NBR, styrene-isoprene copolymer, styrene-isoprene-butadiene copolymer and the like are preferable.

A crosslinking agent, a softening agent, a filler, a flame retardant, etc. can be added to a rubber-type adhesive as needed. Specific examples include isocyanate crosslinking agents as crosslinking agents, liquid rubber as softening agents, calcium carbonate as fillers, and inorganic flame retardants such as magnesium hydroxide and red phosphorus as flame retardants.

Examples of the acrylic pressure-sensitive adhesive include a homopolymer of (meth) acrylic acid ester or a copolymer with a copolymerizable monomer. (Meth) acrylic acid ester or copolymerizable monomer includes (meth) acrylic acid alkyl ester (for example, methyl ester, ethyl ester, butyl ester, 2-ethylhexyl ester, octyl ester, etc.), (meth) acrylic acid glycidyl ester , (Meth) acrylic acid, itaconic acid, maleic anhydride, (meth) acrylic acid amide, (meth) acrylic acid N-hydroxyamide, (meth) acrylic acid alkylaminoalkyl ester (for example, dimethylaminoethyl methacrylate, t- Butylaminoethyl methacrylate), vinyl acetate, styrene, acrylonitrile and the like. Of these, as the main monomer, an alkyl acrylate ester whose homopolymer (homopolymer) usually has a glass transition temperature of −50 ° C. or lower is preferred.

The tackifying resin agent can be selected in consideration of the softening point, compatibility with each component, and the like. Examples include terpene resins, rosin resins, hydrogenated rosin resins, coumarone / indene resins, styrene resins, aliphatic and alicyclic petroleum resins, terpene-phenol resins, xylene resins, and other aliphatic carbonizations. Examples thereof include a hydrogen resin or an aromatic hydrocarbon resin. The softening point of the tackifying resin is preferably 65 to 130 ° C, and moreover, an alicyclic saturated hydrocarbon resin of a petroleum resin having a softening point of 65 to 130 ° C, a polyterpene resin having a softening point of 80 to 130 ° C, and a softening point of 80 to 130. More preferred is a glycerin ester of hydrogenated rosin at 0 ° C. These can be used either alone or in combination.

The anti-aging agent is used to improve the rubber-based pressure-sensitive adhesive because it has an unsaturated double bond in the rubber molecule and is likely to deteriorate in the presence of oxygen or light.

Examples of the anti-aging agent include phenolic anti-aging agents, amine-based anti-aging agents, benzimidazole-based anti-aging agents, dithiocarbamate-based anti-aging agents, phosphorus-based anti-aging agents and the like alone or as a mixture. it can.

Examples of the curing agent for the acrylic pressure-sensitive adhesive include isocyanate-based, epoxy-based, and amine-based ones, and may be a mixture of these alone or a mixture thereof.

Specific examples of the isocyanate curing agent include polyvalent isocyanate compounds such as 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylene diisocyanate, and diphenylmethane. -4,4'-diisocyanate, diphenylmethane-2,4'-diisocyanate, 3-methyldiphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, dicyclohexylmethane-2,4'-diisocyanate, Examples include lysine isocyanate.

The means for applying to the film substrate such as the pressure-sensitive adhesive, pressure-sensitive adhesive imparting agent and anti-aging agent constituting the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape is not particularly limited. For example, the pressure-sensitive adhesive, the pressure-sensitive adhesive imparting agent and There is a method in which a pressure-sensitive adhesive solution comprising an anti-aging agent or the like is applied to one side of the film substrate by a transfer method and dried. Although the thickness of an adhesive layer can be suitably selected in the range which does not impair adhesiveness or handleability, the thickness of an adhesive layer is 5-100 micrometers, for example, Preferably it is 10-50 micrometers. If it is thinner than this, the adhesive force and the unwinding force may decrease. On the other hand, if it is thicker than this, the coating performance may deteriorate.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

In Table 1, “flexibility” is a tensile strength of 25% modulus measured in accordance with JIS C 2107. In an evaluation test chamber set at a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5% RH, the pressure-sensitive adhesive tape to be tested showed an average value of measured values of n = 3 or more, and was evaluated according to the following criteria.
O The tensile strength of the modulus is 5.0 to 15.0 N / mm2.
X Less than 5.0 N / mm2, 15.0 N / mm2 or more.

In Table 1, “elongation” is the tensile elongation at break measured according to JIS C 2107. In an evaluation test chamber set at a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5% RH, the pressure-sensitive adhesive tape to be tested showed an average value of measured values of n = 3 or more, and was evaluated according to the following criteria.
○ Tensile elongation at break is 100 to 400%.
X Less than 100%, 400% or more.

In Table 1, “hand cutting property” means that the adhesive tape formed to a length of 100 mm is cut by a human hand in the lateral direction, and the state of the cut surface of the cut surface of the adhesive tape is evaluated. Visual evaluation was performed.
The cut end is clean.
○ The cut end is clean.
△ The cut is slightly stretched but is cut cleanly.
X The cut end extends and further cuts in the flow direction of the adhesive tape.

In Table 1, “thermal shrinkage” means an evaluation test chamber set at a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5% RH after leaving a 100 mm long film at 100 ° C. for 10 minutes. The shrinkage rate of MD and TD after standing for 20 minutes or longer. An average value of measured values of n = 3 or more is shown and evaluated according to the following criteria.
○ Shrinkage is less than 10%.
X 10% or more.

In Table 1, “Abrasion resistance” means that a cotton cloth No. 3 is placed as a wear material on a film having a length of 100 mm and a width of 50 mm, a weight of 500 g is placed thereon, and a speed of 80 reciprocations per minute. The degree of scratching of the film after rubbing the film and the wear material was visually evaluated according to the following criteria.
○ There is no scratch.
× Something is scratched.

In Table 1, “workability” was evaluated based on the following criteria for ease of use when an adhesive tape was wrapped around a 1 mm diameter wire cable.
○ The tape does not stretch or break during winding.
X Those with elongation or breakage.

In Table 1, “terminal peeling” means that an adhesive tape is wound around an electric wire cable in a half wrap shape, and the presence or absence of terminal peeling of the terminal portion at the end of winding is visually evaluated according to the following criteria.
○ There is no terminal peeling.
× Something with terminal peeling.

In Table 1, “whitening” was performed by visually observing the presence or absence of whitening of the cut surface at the end of winding, by winding an adhesive tape around a wire cable in a half wrap shape.
○ No whitening.
× Things with whitening.

In Table 1, “film workability” is the degree of resin melting when film forming is performed by calendaring. The index of the resin melting condition is the melting start temperature, and the melting start temperature is apparent from the Koka type flow tester (model number CFT-500A, manufactured by Shimadzu Corporation) under the conditions of a nozzle with a diameter of 1 mm, a length of 10 mm, and a load of 100 g. Is a temperature at which the melt viscosity starts to be measured. In Table 1, the average value of the measured values of n = 3 or more is shown and evaluated according to the following criteria.
○ The temperature at which the melt viscosity starts to drop is less than 200 ° C.
X The temperature at which the melt viscosity starts to drop is 200 ° C or higher.

In Table 1, “flame retardancy” was measured according to JIS K 7201. An adhesive tape sample with a width of 20 mm and a length of 150 mm is fixed to a wire with a diameter of 0.8 mm, standing vertically, kept at the measured oxygen concentration for 30 seconds, ignited from the upper end of the sample, and after removing the ignition source, within 4 seconds This is the oxygen concentration (oxygen index) when digested. In Table 1, the minimum value of the measured values of n = 3 or more is shown and evaluated according to the following criteria.
○ The oxygen index is 18 or more.
X Less than 18.

(Example 1) The composition of the film base of the pressure-sensitive adhesive tape in this example was 100 parts by mass of a completely hydrogenated styrene-butadiene random copolymer (SOE SS9000 manufactured by Asahi Kasei Chemicals Corporation) 30 parts by mass of styrene resin (G-14L manufactured by Toyo Styrene Co., Ltd.), 30 parts by mass of maleimide copolymer (MS-NB: 46% by mass of aromatic vinyl monomer, unsaturated dicarboxylic acid manufactured by Denki Kagaku Kogyo Co., Ltd.) 52% by mass of imide derivative, 2% by mass of unsaturated dicarboxylic acid anhydride), 30 parts by mass of nitrile copolymer (AS-3 manufactured by Denki Kagaku Kogyo Co., Ltd .: 80% by mass of aromatic vinyl monomer, single vinyl cyanide) 20 parts by mass), 30 parts of magnesium hydroxide (Magsees N-1 manufactured by Kamishima Chemical Co., Ltd.) with an average particle size of 5.0 μm, and other small amounts of stabilizers, lubricants, and coloring agents. It is obtained by. The back adhesive strength is 3.0 N / 10 mm. As a pressure-sensitive adhesive, it contains a rubber-based pressure-sensitive adhesive composed of a mixture of natural rubber and SBR. This compounding agent is kneaded with a Banbury mixer, formed into a thickness of about 0.1 mm by calendering, and then a tape with a width of 25 mm. The adhesive tape of Example 1 was obtained.

In Example 1, all the characteristic values were evaluated as good, and an adhesive tape having the desired flexibility, hand cutting, heat resistance, wear resistance, and the like was obtained. The comparative examples described below are the same as the present examples unless otherwise specified.

Example 2 The composition was the same as in Example 1 except that the adhesive was changed from a rubber adhesive to an acrylic adhesive. All the characteristic values were evaluated as good, and the intended adhesive tape was obtained.

Example 3 100 parts by mass of a completely hydrogenated styrene-butadiene random copolymer was changed to 100 parts by mass of a completely hydrogenated styrene-butadiene block copolymer (SIBSTAR 103T manufactured by Kaneka Chemical Co., Ltd.). Was the same formulation as in Example 1. All the characteristic values were evaluated to be almost satisfactory, and the desired adhesive tape was obtained.

(Example 4) The composition was the same as in Example 3 except that the adhesive was changed from a rubber adhesive to an acrylic adhesive. All the characteristic values were evaluated to be almost satisfactory, and the desired adhesive tape was obtained.

(Comparative Examples 1 and 2) In Comparative Example 1 in which the blending amount of the styrene resin of Example 1 was changed to 5 parts by mass, workability was not obtained because the film substrate was too soft. In Comparative Example 2 in which the blending amount of the styrene-based resin in Example 1 was changed to 100 parts by mass, the film base material became hard, and flexibility, elongation, wear resistance and hand cutting properties were not obtained, and terminal peeling occurred. The tape cut surface became white.

(Comparative Examples 3 to 4) In Comparative Example 3 where the blending amount of the maleimide copolymer of Example 1 was changed to 0.5 parts by mass, the heat shrinkage rate of the film substrate was poor, and further flame retardancy was obtained. There wasn't. In Comparative Example 4 in which the blending amount of the maleimide copolymer of Example 1 was changed to 100 parts by mass, the film substrate became hard, and hand cutting properties, wear resistance, flexibility, and workability were not obtained, and resin Due to insufficient melting of the film, film processability was poor, terminal peeling occurred, and the tape cut surface was whitened.

(Comparative Examples 5 to 6) In Comparative Example 5 in which the blending amount of the nitrile copolymer of Example 1 was changed to 0.5 parts by mass, the film base material was hardened, and the hand cutting property, flexibility, elongation, and abrasion resistance were increased. The workability and workability were not obtained, the film processability was poor due to insufficient melting of the resin, the terminal peeling occurred, and the tape cut surface was whitened. In Comparative Example 6 in which the blending amount of the vinyl copolymer of Example 1 was changed to 100 parts by mass, the heat shrinkage rate of the film substrate was poor, and further flame retardancy was not obtained.

Although not shown in Table 1, the heat deformation rate of Example 1 was −43%. This heat deformation rate is the deformation rate of the length in the longitudinal direction of the pressure-sensitive adhesive tape that has been heat-treated at 140 ° C. for 5 minutes and then left at 23 ° C. for 30 minutes or more, and the length of the pressure-sensitive adhesive tape in the longitudinal direction. It shows sex. As another example, when the film base material of Example 1 was cross-linked by irradiation with an electron beam of 20 Mrad, the heating deformation rate was −6%, and the temperature dependency was reduced. Examples 1 and 2 have the same tensile strength, elongation at break, electrical insulation (volume resistivity of 1 × 1012 Ω · cm or more), electric resistance and breakdown voltage equivalent to those of conventional polyvinyl chloride tapes. It was.

Claims (11)

A film substrate containing 10 to 60 parts by mass of a styrene resin, 1 to 50 parts by mass of a maleimide copolymer and 1 to 50 parts by mass of a nitrile copolymer with respect to 100 parts by mass of an aromatic vinyl elastomer. The aromatic vinyl elastomer is selected from the group consisting of a styrene-butadiene random copolymer, a styrene-butadiene block copolymer, a hydrogenated styrene-butadiene random copolymer, and a hydrogenated styrene-butadiene block copolymer. The film substrate according to claim 1, which is at least one compound selected. The film substrate according to claim 1 or 2, wherein the styrenic resin is a polystyrene resin (GPPS) or a rubber-reinforced polystyrene resin (HIPS). A maleimide copolymer is obtained by polymerizing 15 to 70% by mass of an aromatic vinyl monomer and 30 to 85% by mass of an unsaturated dicarboxylic imide derivative, and the aromatic vinyl monomer is styrene or the unsaturated dicarboxylic acid. The film substrate according to any one of claims 1 to 3, wherein the acid imide derivative is N-phenylmaleimide. A nitrile copolymer is obtained by polymerizing 40 to 85% by mass of an aromatic vinyl monomer and 15 to 40% by mass of a vinyl cyanide monomer, and the nitrile copolymer is made of styrene or vinyl cyanide monomer. The film base according to any one of claims 1 to 3, wherein the monomer is acrylonitrile. The film base material as described in any one of Claims 1-5 which contains 1-200 mass parts of inorganic fillers in a film base material. The film base according to any one of claims 1 to 6, wherein the inorganic filler is at least one compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, hydrotalcite, and magnesium carbonate. The film base material according to claim 1, wherein the film base material is crosslinked by irradiating an electron beam. The adhesive tape which formed the adhesive layer in the single side | surface of the film base material as described in any one of Claims 1-8. An adhesive tape for bundling using the adhesive tape according to claim 9. The manufacturing method of the film base material which calendar-processes the film base material as described in any one of Claims 1-7 at the roll temperature of 150-220 degreeC.