JP2001059057A - Thermoplastic elastomer composition and speaker using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermoplastic elastomer composition excellent in strength, flexibility and acoustic characteristics at a temperature within the range of low to high temperatures. SOLUTION: This thermoplastic elastomer composition comprises a thermoplastic resin composition forming a matrix phase containing (A) a thermoplastic resin having >=80 deg.C softening point and (B) a polymer having 0-50 deg.C peak temperature of tanδ and an elastomer composition forming a dispersed phase containing (C) an elastomer having <=-20 deg.C glass transition point. The speaker uses the elastomer composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic elastomer composition and a loudspeaker using the same, and more particularly, to a thermoplastic elastomer composition having excellent strength, flexibility and acoustic characteristics in a low to high temperature range. The present invention relates to an object and a speaker using the same.

[0002]

2. Description of the Related Art A so-called cone type speaker used for a car audio or the like has a cone and a voice coil for vibrating the cone connected to the cone. In order to fix the cone and the voice coil to the frame of the speaker, a vibration system support member is used. As the vibration system support member, an edge provided between the cone and the frame and a damper provided between the voice coil and the frame are known.

For example, as shown in FIG. 1, the edge is provided on the peripheral portion of the cone 1 and is formed in a ring shape with a flexible material such as urethane foam or butyl rubber. However, there is a problem that urethane foam is inferior in weather resistance and wet heat resistance. Further, rubber has a relatively large specific gravity and a large tan δ of 0.4 or more, so that the vibration absorption is excessively increased, and there is a problem that sound quality is deteriorated such as muffled sound.

[0004] Further, since a car equipped with a car audio is placed in a high temperature state under the hot sun or a low temperature state in a cold region, a vibration system supporting member of a speaker having excellent strength, flexibility and acoustic characteristics in a wide temperature range is required. Was desired.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a thermoplastic elastomer composition having excellent strength, flexibility and acoustic characteristics in a low to high temperature range and a speaker using the same. It is in.

[0006]

According to the present invention, a matrix phase containing a thermoplastic resin (A) having a softening point of 80 ° C. or higher and a polymer (B) having a tan δ peak temperature of 0 to 50 ° C. A thermoplastic resin composition to be formed and an elastomer composition to form a dispersed phase containing an elastomer (C) having a glass transition point of −20 ° C. or less, and a volume of the thermoplastic resin composition and the elastomer composition The ratio is thermoplastic resin composition / elastomer composition = 90/10
To 20/80, wherein the thermoplastic elastomer composition contains 3 to 60% by weight of the polymer (B).

According to the present invention, the specific gravity is 1.2 or less, and the Young's modulus at -30 to 80 ° C. is 1 to 50 MPa.
The thermoplastic elastomer composition is provided.

Further, according to the present invention, there is provided a speaker using the above thermoplastic elastomer composition for a speaker member.

Further, according to the present invention, there is provided a speaker using the thermoplastic elastomer composition for a vibration system supporting member.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is intended to improve strength, flexibility and acoustic characteristics in a low to high temperature range as a material suitable for a vibration system supporting member such as a speaker edge and a damper. A thermoplastic resin composition forming a matrix phase containing a thermoplastic resin (A) having a softening point of 80 ° C. or higher and a polymer (B) having a tan δ peak temperature of 0 to 50 ° C., and a glass transition point of − 20 ° C
An object of the present invention is to provide a thermoplastic elastomer composition comprising an elastomer composition forming a dispersed phase containing the following elastomer (C). Further, it is superior in weather resistance and wet heat resistance as compared with urethane foam or the like. Furthermore, the thermoplastic elastomer composition has a lower specific gravity than rubber and can also achieve weight reduction of automobile parts, and further reduction in weight can be achieved by reducing the wall thickness.

The thermoplastic elastomer composition of the present invention comprises:
This is a composition having a sea-island structure in which a dispersed phase of an elastomer composition is dispersed in a matrix phase of a thermoplastic resin composition, and having thermoplasticity and flexibility. The thermoplastic resin composition contains the thermoplastic resin (A) and the polymer (B). This softening point is 80 ° C. or higher, preferably
By blending the thermoplastic resin (A) having a temperature of 100 ° C. or more, even in a vehicle having a high temperature of 70 to 80 ° C. in summer, the thermoplastic elastomer composition hardly causes sag such as strength at a high temperature. Physical properties can be improved.

The thermoplastic resin (A) has a softening point of 8
Although it is not particularly limited as long as it is 0 ° C. or higher, polyolefin-based resins (for example, high-density polyethylene (HDPE), low-density polyethylene (LDPE), ultra-high-molecular-weight polyethylene (UHMWPE), isotactic polypropylene,
Ethylene-propylene copolymer), polyamide-based resin (for example, nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 12 (N12), nylon 610 (N610), nylon 612 (N612), nylon 6/66 copolymer (N6 / 66), nylon 6/66/610 copolymer (N6 / 66/610), nylon MXD6 (MXD
6), nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer), polyester resin (for example, polybutylene terephthalate (PBT), polyethylene terephthalate (P
ET), polyethylene isophthalate (PEI), polyester copolymer, PET / PEI copolymer, polyarylate (PAR), polybutylene naphthalate (PB
N), liquid crystal polyester, aromatic polyester such as polyoxyalkylenediimidic acid / polybutylate terephthalate copolymer), polyether-based resin (for example, polyacetal (POM), polyphenylene oxide (PP)
O), polysulfone (PSF), polyetheretherketone (PEEK)), polynitrile resins (eg, polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile / styrene copolymer (AS),
Methacrylonitrile / styrene copolymer, methacrylonitrile / styrene / butadiene copolymer), polymethacrylate-based resin (for example, polymethyl methacrylate (PM
MA), polyethyl methacrylate), polyvinyl resins (eg, vinyl acetate (EVA), polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (E
VOH), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), vinyl chloride / vinylidene chloride copolymer, vinylidene chloride / methyl acrylate copolymer),
Cellulosic resins (eg, cellulose acetate, cellulose acetate butyrate), fluororesins (eg, polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polychlorofluoroethylene (PCTFE), tetrafluoroethylene / ethylene copolymer (ETFE) )), Imide-based resins (eg, aromatic polyimide (PI)), polyacetal, and the like, and two or more of these may be used in combination.

The polymer (B) blended in the thermoplastic resin composition forming the matrix phase has a peak temperature of tan δ, that is, a peak of a temperature dispersion curve obtained by plotting the relationship between tan δ and temperature, preferably from 0 to 50 ° C. Is 5
30 ° C. The environment to listen to the sound through the speaker is 0
~ 50 ° C, usually at room temperature. In this temperature range, t
If a polymer having a peak temperature of an δ is blended, tan δ in the use region can be easily controlled.

The polymer (B) is not particularly limited as long as it has a tan δ peak temperature of 0 to 50 ° C. For example, isotactic polypropylene, ethylene propylene copolymer, 4-methylpentene, nylon 6 (N
6), nylon 66 (N66), nylon 11 (N1
1), nylon 12 (N12), nylon 610 (N6
10), nylon 612 (N612), nylon 6/6
6 copolymer (N6 / 66), styrene vinyl isoprene copolymer, and the like, and two or more of these may be used in combination.

The elastomer (C) blended in the elastomer composition forming the dispersed phase of the present invention has a glass transition point (Tg) of -20 ° C. or lower, preferably -30 ° C. or lower. The strength and flexibility at a low temperature of the elastomer composition can be maintained.

The elastomer (C) is not particularly limited as long as it has a glass transition point of -20 ° C. or lower. However, diene rubbers and hydrogenated products thereof (for example, NR, IR, epoxidized natural rubber, SBR, BR (high Cis BR and low cis BR), NBR, olefin rubbers (eg, ethylene propylene rubber (EPDM, EPM), maleic acid-modified ethylene propylene rubber, IIR, isobutylene and aromatic vinyl or diene monomer copolymer, acrylic rubber (ACM ), Ionomers), halogen-containing rubbers (eg, Br-IIR, CI-IIR, brominated isobutylene paramethylstyrene copolymer (Br-IPMS), C
R, hydrin rubber (CHR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), maleic acid-modified chlorinated polyethylene, silicon rubber (eg, methyl vinyl silicone rubber, dimethyl silicone rubber, methyl phenyl vinyl silicone rubber), including Sulfur rubber (for example, polysulfide rubber), fluorine rubber (for example, vinylidene fluoride rubber, fluorine-containing vinyl ether rubber, tetrafluoroethylene-propylene rubber, fluorine-containing silicon rubber, fluorine-containing phosphazene rubber),
Examples include urethane rubber, epichlorohydrin rubber, and thermoplastic elastomers (for example, styrene-based elastomers, olefin-based elastomers, ester-based elastomers, urethane-based elastomers, and polyamide-based elastomers), and two or more of these may be used in combination.

The ratio of the thermoplastic resin composition to the elastomer composition of the present invention is as follows: thermoplastic resin composition / elastomer composition = 90/10 to 20/80, preferably 70/30 to 30 / 70. In volume ratio,
If the amount of the thermoplastic resin composition is less than 20/80, the thermoplastic resin composition cannot form a matrix phase, and does not exhibit thermoplastic properties. If too much, the flexibility is reduced.

The amount of the polymer (B) contained in the thermoplastic elastomer composition is 3 to 60% by weight. Conventionally, rubber used for a vibration system supporting member of a loudspeaker has a tan δ of about 0.5. By setting the blending amount of the polymer (B) in the above range, the tan δ range in which the sound is not broken and the sound is not muffled, that is, tan δ can be controlled to 0.15 to 0.35.

Further, the specific gravity of the thermoplastic elastomer composition of the present invention is preferably 1.2 or less, more preferably 1.1 or less. This is because by lowering the specific gravity of the thermoplastic elastomer composition, the vibration-system supporting member is likely to vibrate, so that it is possible to improve acoustic characteristics such as suppressing a muffled sound. For example, while the conventionally used butyl-based rubber has a specific gravity of 1.3 or more, by reducing the specific gravity as described above, the weight is reduced, the speaker cone is easily vibrated, and the acoustic characteristics are improved. Is further improved.

The Young's modulus of the thermoplastic elastomer composition of the present invention at -30 to 80 ° C. is 1 to 50 MPa.
a, more preferably 1 to 30 MPa, and good strength physical properties and flexibility in a temperature range from low to high temperatures can be obtained.

By setting the volume fraction and the melt viscosity of the thermoplastic resin composition and the elastomer composition so as to satisfy the following formulas, the thermoplastic resin composition is melt-kneaded by a twin-screw kneading extruder or the like. In addition, the elastomer composition can be easily formed into a dispersed phase.

(Φ _R / φ _P ) × (η _P / η _R ) <1 (where φ _R : volume fraction of the elastomer composition φ _P : volume fraction of the thermoplastic resin composition η _R : heat Melt viscosity of the elastomer composition at the temperature and shear rate conditions at the time of kneading the thermoplastic resin composition and the elastomer composition η _P : of the thermoplastic resin composition at the temperature and shear rate conditions at the time of kneading the thermoplastic resin composition and the elastomer composition Melt viscosity.)

Here, the melt viscosity means the melt viscosity of any temperature and component during kneading, and the melt viscosity of each polymer material depends on the temperature, shear rate (sec ^-1 ) and shear stress. In general, the melt viscosity is measured by measuring the stress and shear rate of the polymer material at an arbitrary temperature in the molten state flowing through the thin tube, particularly in the temperature range during kneading, and dividing the shear stress by the shear rate. calculate. For measuring the melt viscosity, a capillary rheometer Capillograph 1C manufactured by Toyo Seiki may be used.

The above-mentioned matrix phase or dispersed phase includes:
For the improvement of fluidity and heat resistance of the thermoplastic elastomer composition, physical strength, cost, etc., other polymers, reinforcing agents, fillers, softeners, anti-aging agents, as long as the objects of the present invention are not impaired. A necessary amount of a compounding agent such as a processing aid, which is added to an ordinary composition, can also be added. Further, a pigment may be added to the thermoplastic resin composition for the purpose of coloring or the like.

If the specific thermoplastic resin composition and the elastomer composition have different chemical compatibility, the third
It is preferred that both are compatibilized using a suitable compatibilizer as a component. By mixing the compatibilizing agent into the system, the interfacial tension between the thermoplastic resin composition and the elastomer composition is reduced, and as a result, the particle diameter of the elastomer composition forming the dispersion layer becomes finer. The properties of the components will be more effectively expressed. Such a compatibilizer is generally a thermoplastic resin component, a copolymer having both or one structure of the elastomer component, or an epoxy group, a carboxyl group, a carbonyl group capable of reacting with the thermoplastic resin component or the elastomer component. , A copolymer having a halogen group, an amino group, an oxazoline group, a hydroxyl group and the like. These may be selected according to the type of the thermoplastic resin component and the elastomer component to be mixed.
Ethylene / butylene / styrene block copolymer (S
EBS) and its modified maleic acid, EPDM, EP
M and their maleic acid-modified products, EPDM / styrene or EPDM / acrylonitrile graft copolymers and their maleic acid-modified products, styrene / maleic acid copolymers, and reactive phenoxines.
The amount of the compatibilizer is not particularly limited, but is preferably 0.5 to 20 parts by weight based on 100 parts by weight of the polymer component (total of the thermoplastic resin and the elastomer).

The vulcanizing agent, vulcanization aid and vulcanization conditions (temperature, time) used for vulcanizing the elastomer composition used in the thermoplastic elastomer composition used in the present invention are as follows.
What is necessary is just to determine suitably according to the composition of the elastomer composition added, and there is no restriction in particular. As the vulcanizing agent, a general rubber vulcanizing agent (crosslinking agent) can be used. Specifically, as sulfur-based vulcanizing agents, powdered sulfur, precipitated sulfur, highly dispersible sulfur, surface-treated sulfur, insoluble sulfur,
Examples thereof include dimorpholine disulfide and alkylphenol disulfide, and for example, 0.5 to 4 phr.
(Parts by weight per 100 parts by weight of the elastomer component (polymer)) may be used.

The organic peroxide-based vulcanizing agents include:
Benzoyl peroxide, t-butyl hydroperoxide, 2,4-dichlorobenzoyl peroxide,
Examples thereof include 2,5-dimethyl-2,5-di (t-butylperoxy) hexane and 2,5-dimethylhexane-2,5-di (peroxylbenzoate).
About 1 to 15 phr may be used. Further, examples of the phenolic resin-based vulcanizing agent include bromide of an alkylphenol resin, a mixed crosslinking system containing a halogen donor such as tin chloride or chloroprene and an alkylphenol resin, and for example, about 1 to 20 phr is used. I just need.

Others include zinc white (about 5 phr),
Magnesium oxide (about 4 phr), litharge (10 to 10 phr)
About 20 phr), p-quinone dioxime, p-dibenzoylquinone dioxime, tetrachloro-p-benzoquinone, poly-p-dinitrosobenzene (2 to 10
phr), methylin dianiline (0.2 to 10 phr)
r) is exemplified.

[0029] If necessary, a vulcanization accelerator may be added. Examples of the vulcanization accelerator include common vulcanization accelerators such as aldehyde / ammonia, guanidine, thiazole, sulfenamide, thiuram, dithioate, and thiourea, for example, 0.5 to 2 phr. The degree may be used.

Specifically, hexamethylenetetramine or the like is used as the aldehyde / ammonia vulcanization accelerator; diphenylguanidine is used as the guanidine vulcanization accelerator; dibenzothia is used as the thiazole vulcanization accelerator. Zirdisulphide (DM), 2-mercaptobenzothiazole and its Zn salt, cyclohexylamine salt, and the like; sulfenamide vulcanization accelerators include cyclohexylbenzothiazylsulfenamide (CBS);
N-oxydiethylenebenzothiazyl-2-sulfenamide, Nt-butyl-2-benzothiazolesulfenamide, 2- (thymolpolynyldithio) benzothiazole and the like; , Tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide, tetramethylthiuram monosulfide (TMTM), dipentamethylenethiuram tetrasulfide, etc .; as dithioate-based vulcanization accelerators, Zn-dimethyldithiocarbamate; Zn-
Thiourea such as diethyldithiocarbamate, Zn-di-n-butyldithiocarbamate, Zn-ethylphenyldithiocarbamate, Tc-diethyldithiocarbamate, Cu-dimethyldithiocarbamate, Fe-dimethyldithiocarbamate, pipecoline pipecolyldithiocarbamate; Examples of the vulcanization accelerator include ethylenethiourea, diethylthiourea and the like;

As a vulcanization accelerator, a general rubber auxiliary agent can be used in combination.
phr), stearic acid, oleic acid, and Zn salts thereof (about 2 to 4 phr) may be used.

As the pigment, an inorganic pigment and an organic pigment can be used.

The inorganic pigments include, for example, zinc white, titanium oxide, red iron oxide, chromium oxide, iron black, and complex oxides (eg, titanium yellow, zinc-iron brown, titanium / cobalt green, cobalt green, cobalt blue) , Copper-
Oxides such as chromium black and copper-iron black); chromates such as graphite and molybdate orange; ferrocyanides such as navy blue; sulfides such as cadmium yellow, cadmium red and zinc sulfide; barium sulfate and the like Sulfates such as ultramarine blue; carbonates such as calcium carbonate; phosphates such as manganese violet; hydroxides such as yellow iron oxide; carbon such as carbon black; metal powders such as aluminum powder and bronze powder; Coated mica.

Organic pigments include monoazo lakes (for example,
Lake Red C, Permanen Red 2B, Brilliant Carmine 6B), Monoazo (for example, Toluidine Red, Naphthol Red, Fast Yellow G, Benzimidalone Bordeaux, Benzimidazolone Brown), Disazo (for example, Disazo Yellow AAA, Disazo Yellow HR) , Pyrazolone red), condensed azo type (for example, condensed azo yellow, condensed azo red, condensed azo brown),
Azo-based pigments such as metal complex salt azo-based (eg, nickel azo yellow); phthalocyanine-based pigments such as copper phthalocyanine blue, copper phthalocyanine green, and brominated copper phthalocyanine green; dyeing such as basic dye lake (eg, rhodamine 6 lake) Pigmented pigments: anthraquinones (eg, flavanthrone yellow, dianthraquinolyl red, indanthrene blue), thioindigos (eg, thioindigo bordeaux), perinones (eg, perinone orange), perylenes (eg, Perylene scarlet, perylene red, perylene maroon), quinacridones (eg, quinacridone red, quinacridone magenta, quinacridone scarlet), dioxazines (eg, dioxazine violet), isoindolinones (eg, i) Indolinone yellow), condensed polycyclic pigments such as quinophthalone type (eg, quinophthalone yellow), isoindoline type (eg, isoindoline yellow), pyrrole type (eg, pyrrole red); metal complex salts azomethine such as copper azomethine yellow; aniline Black; daylight fluorescent pigments.

The method for producing the thermoplastic elastomer composition used in the present invention is as follows. The thermoplastic resin composition and the elastomer composition (unvulcanized in the case of rubber) are melt-kneaded in advance by a twin-screw kneading extruder or the like. By dispersing the elastomer composition as a dispersed phase in a thermoplastic resin forming a matrix phase. Next, in order to vulcanize the elastomer composition, a vulcanizing agent is added under kneading, and the elastomer composition is dynamically vulcanized. Further, various compounding agents for the thermoplastic resin or the elastomer composition may be added during the above kneading, but it is preferable to mix them in advance before kneading. At this time, a vulcanizing agent may be mixed in the elastomer composition in advance, and vulcanization may be simultaneously performed during kneading of the thermoplastic resin and the elastomer composition. The kneading machine used for kneading the thermoplastic resin and the elastomer composition is not particularly limited, and a screw extruder, a kneader, a Banbury mixer, a twin-screw kneading extruder and the like can be used. Among them, for kneading the thermoplastic resin and the elastomer composition and for dynamic vulcanization of the elastomer composition, it is preferable to use a twin-screw kneading extruder. Further, two or more types of kneaders may be used to knead sequentially. As the conditions for the melt-kneading, the temperature may be at least the temperature at which the thermoplastic resin melts. The shear rate during kneading is preferably from 500 to 7,500 sec ^-1 . The total kneading time is preferably 30 seconds to 10 minutes, and the vulcanization time after addition is preferably 15 seconds to 5 minutes.

As described above, in the thermoplastic elastomer composition used in the present invention, the elastomer is dynamically crosslinked. That is, the thermoplastic resin and the elastomer are kneaded and the crosslinking of the elastomer is advanced. By using such a production method, the obtained thermoplastic elastomer composition is in a state where the crosslinked elastomer phase which is a discontinuous phase is finely dispersed in the thermoplastic resin phase which is a continuous phase.

The thermoplastic elastomer composition produced by the above method may be produced in the shape of a vibration system supporting member such as a speaker edge or a damper by injection molding, press molding, extrusion molding or the like. Further, it can be used for other speaker members, and can be applied to any product other than the speaker.

[0038]

EXAMPLES The present invention will be further described with reference to the following examples, but it goes without saying that the scope of the present invention is not limited to these examples. Examples 1 to 5 and Comparative Examples 1 to 7 First, the elastomer, carbon black, and oil shown in Table 1 below were charged into a Banbury mixer at the weight ratio shown in Table 1 below, and kneaded for about 2 minutes. The sulfur-based compounding agent was added and mixed, and released at 135 ° C. The released rubber was pelletized with a rubber pelletizer, dry-blended in a weight ratio shown in Table 2, and charged into a twin-screw kneader to obtain 1 pellet.
The mixture was kneaded at 80 ° C. at a shear rate of 1000 sec ⁻¹ to obtain a thermoplastic elastomer composition.

The thermoplastic elastomer composition extruded in the form of a strand from the discharge port of the twin-screw kneader was water-cooled and pelletized with a resin pelletizer. Next, the pellets were formed into a plate having a thickness of 2 mm using an injection molding machine, and used as samples to be subjected to the following various physical property tests. Further, using these thermoplastic elastomer compositions, an edge having the shape shown in FIG. 1 was produced by injection molding, attached to a speaker, and evaluated for acoustic characteristics. Tensile strength (MPa) The breaking strength was measured in accordance with JIS K6251. Elongation (%) The elongation at break was measured according to JIS K6251.

Young's modulus (MPa) From the stress / strain curve of the tensile test of JIS K6251,
It was calculated from the slope of the curve at the beginning of tension. tan δ Using a viscoelastic spectrometer manufactured by Toyo Seiki Seisakusho, ta at 25 ° C. under the conditions of a strain of 10 ± 2% and a frequency of 100 Hz.
nδ was measured.

[0041]

[Table 1]

The following ingredients were used. EPDM: Mitsui EPT4021, manufactured by Mitsui Chemicals, Tg:
-70 ° C Denatured IIR: Exxpro89-4, manufactured by Exxon Chemical Co., Ltd., Tg: -50 ° C H-NBR: Zetpol1020, manufactured by Zeon Corporation,
Tg: 0 ° C Carbon black: Seast V, manufactured by Tokai Carbon Co., Ltd. Paraffin oil: PW-380, manufactured by Idemitsu Petrochemical Co., Ltd. Zinc flower: 3 types of zinc flower, manufactured by Seido Chemical Co., Ltd. Organic peroxide: Percadox 14-40, manufactured by Kayaku Akzo Co., Ltd. Brominated phenol: Tackilol 250-I, manufactured by Taoka Chemical Company

[0043]

[Table 2]

[0044]

[Table 3]

The following resins were used as the resins used above. EVA: Ethylene vinyl acetate resin, Suntech EVA-
Q360, Asahi Kasei Corporation, softening point: 60 ° C PP: polypropylene resin, Tokuyama Polypro ME440,
Tokuyama Co., softening point: 100 ° C PER: polypropylene / ethylene copolymer, T310
J, Tokuyama, softening point: 110 ° C PAE: polyamide elastomer resin, Pebax 63
33, Atochem, softening point: 200 ° C. Styrene vinyl isoprene copolymer: Hibler 512
7, Kuraray Co., tan δ peak temperature: 20 ° C 4 Methylpentene 1: TPX-MX002, Mitsui Chemicals, tan δ peak temperature: 25 ° C

As shown in Table 2, Comparative Example 1 using the thermoplastic resin (A) having a softening point of less than 80 ° C. was inferior in physical properties at high temperatures. tan δ is -20 ° C
Comparative Example 2 in which the rubber 3 having more than 3 was used as the elastomer (C) had too high a Young's modulus at a low temperature and lacked flexibility. In Comparative Example 3 in which the amount of the polymer (B) was too small, and in Comparative Example 4 in which the amount of the polymer (B) was too large, the tan δ of the thermoplastic elastomer composition did not fall within an appropriate range. , And it got worse. Comparative Example 5 containing too much thermoplastic resin
Is less flexible at room temperature. In Comparative Example 6 containing too much elastomer composition, phase inversion occurred and did not form a thermoplastic resin composition. In Comparative Example 7 comprising only the rubber composition, tan δ was too large, and when used as an edge of a speaker, the sound was muffled and the acoustic characteristics were deteriorated.
In contrast, the thermoplastic elastomer compositions of Examples 1 to 5 of the present invention have various physical properties at low and high temperatures, ta
The result that the balance of nδ and acoustic characteristics was excellent was obtained.

[0047]

According to the present invention, a thermoplastic resin (A) having a softening point of 80 ° C. or more and a tan δ peak temperature of 0 to 50
C. and a thermoplastic resin composition forming a matrix phase containing the polymer (B), and a glass transition point of -2.
By using a thermoplastic elastomer composition comprising an elastomer composition forming a dispersed phase containing an elastomer (C) at 0 ° C. or lower, thermoplasticity excellent in strength, flexibility, and acoustic properties in a low to high temperature range. An elastomer composition can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a speaker edge with a part thereof cut away.

[Explanation of symbols] 1 cone 2 edge

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4J002 AA01W AC01Y AC03Y AC06Y AC07Y AC08Y AC09Y AC11Y AC12Y BB12X BB15X BB15Y BB17X BB18Y BB21Y BB23Y BB24Y BB27Y BC05X BC08Y BD12Y CH04Y CK04A01 G05A01

Claims (4)

[Claims] 1. A thermoplastic resin composition which forms a matrix phase containing a thermoplastic resin (A) having a softening point of 80 ° C. or higher and a polymer (B) having a tan δ peak temperature of 0 to 50 ° C., and It consists of an elastomer composition forming a dispersed phase containing an elastomer (C) having a glass transition point of -20 ° C or lower, and the volume ratio of the thermoplastic resin composition to the elastomer composition is thermoplastic resin composition / elastomer composition A thermoplastic elastomer composition comprising: 90/10 to 20/80, and 3 to 60% by weight of the polymer (B). 2. The thermoplastic elastomer composition according to claim 1, having a specific gravity of 1.2 or less and a Young's modulus at -30 to 80 ° C. of 1 to 50 MPa. 3. A speaker using the thermoplastic elastomer composition according to claim 1 for a speaker member. 4. A speaker using the thermoplastic elastomer composition according to claim 1 for a vibration system support member.