JPH1036578A - Interior automotive trim and thermoplastic elastomer composition therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermoplastic elastomer composition for an interior automotive trim capable of maintaining the heat and light resistances, etc., at satisfiable high levels and improved in fogging resistance and to provide the interior automotive trim using the thermoplastic elastomer composition. SOLUTION: The thermoplastic elastomer composition and interior automotive trim comprise the following components (A) to (C) and have <=15% haze of a glass plate measured after the passage of 20hr from heating of the glass plate at 100 deg.C by using an apparatus according to the specification of ISO6452: (A) an olefinic resin, (B) an ethylene-α-olefinic copolymer rubber and (C) an additive for the resin.

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 for automobile interiors and an automobile interior part. More specifically, the present invention relates to a thermoplastic elastomer composition for automobile interiors which maintains heat resistance, light resistance and the like at a satisfactory high level and has improved fogging resistance, and an automobile interior using the thermoplastic elastomer composition. It concerns parts.

[0002]

2. Description of the Related Art Thermoplastic elastomer compositions are being widely used for automotive interior parts such as instrument panels (dashboards). Here, the thermoplastic elastomer composition used for automobile interior parts has heat resistance,
It is required to be excellent in general properties such as light resistance and also excellent in fogging resistance. Here, fogging refers to a phenomenon in which various additives contained in the resin composition volatilize and adhere to the window glass, causing inconvenience such as deterioration of visibility. And, from the viewpoint of maintaining heat resistance, light resistance and the like at a satisfactory high level, and from the viewpoint of excellent fogging resistance, it is difficult to say that the thermoplastic elastomer composition according to the conventional technique can be sufficiently satisfied. Was something.

[0003]

SUMMARY OF THE INVENTION In view of the above situation, an object of the present invention is to maintain heat resistance and light resistance at a satisfactory high level and to improve heat resistance for automobile interiors with improved fogging resistance. An object of the present invention is to provide a thermoplastic elastomer composition and an automobile interior part using the thermoplastic elastomer composition.

[0004]

That is, according to one aspect of the present invention, an apparatus which contains the following components (A) to (C) and conforms to the ISO 6452 standard and has a heating temperature of 1 unit is used.
The present invention relates to a thermoplastic elastomer composition for automobile interiors in which the haze of a glass plate measured after heating at 00 ° C. for 20 hours is 15% or less. (A): Olefin resin (B): Ethylene-α-olefin copolymer rubber (C): Additive for resin

[0005] Another aspect of the present invention relates to an automobile interior part obtained by using the above-mentioned thermoplastic elastomer composition.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The component (A) of the present invention is an olefin resin. As the olefin resin, polypropylene, a copolymer of propylene and an α-olefin having 2 or more carbon atoms, and polyethylene are preferable. Examples of the α-olefin having two or more carbon atoms include ethylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 1-decene, 3-methyl-1-pentene, 4- Methyl-1-pentene, 1-octene and the like can be mentioned. The melt flow rate of the olefin resin is usually from 0.1 to 500 g / 10 minutes, and preferably from 0.5 to 300 g / 10 minutes.

The component (B) of the present invention is an ethylene-α-olefin copolymer rubber. Examples of the ethylene-α-olefin copolymer rubber include an ethylene-α-olefin copolymer rubber and an ethylene-α-olefin-nonconjugated diene copolymer rubber.

The α-olefin in the ethylene-α-olefin-nonconjugated diene copolymer rubber includes, for example, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, Examples thereof include 1-decene, and among them, propylene is preferred.
Examples of the non-conjugated diene include 1,4-hexadiene, 1,6-octadiene and 2-methyl-1,5-diene.
Hexadiene, 6-methyl-1,5-heptadiene, 7
Chain non-conjugated dienes such as -methyl-1,6-octadiene; cyclohexadiene, dicyclopentadiene, methyltetrahydroindene, 5-vinylnorbornene,
5-ethylidene-2-norbornene, 5-methylene-2
Cyclic non-conjugated dienes such as -norbornene, 5-isopropylidene-2-norbornene, 6-chloromethyl-5-isopropylenyl-2-norbornene; 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3
Trienes such as -isopropylidene-5-norbornene, 2-propenyl-2,2-norbornadiene, 1,3,7-octatriene and 1,4,9-decatriene, among which 5-ethylidene-2- Norbornene or dicyclopentadiene is preferred.

The ratio (molar ratio) of ethylene / α-olefin in the ethylene-α-olefin copolymer rubber is 1 / (0.1 to 10).

When the ethylene-α-olefin-non-conjugated diene copolymer rubber is used, the content of the non-conjugated diene is as follows:
The iodine value is usually 2 to 25.

The ethylene-α-olefin copolymer rubber is preferably an ethylene-α-olefin copolymer rubber containing no non-conjugated diene from the viewpoint of light resistance and fogging resistance. In the case of producing an elastomer, the crosslinking density is insufficient, and the mechanical strength may be reduced. As a countermeasure against this inconvenience, a method using N, N'-m-phenylenebismaleimide or divinylbenzene as a cross-linking aid can be mentioned. Note that an ethylene-α-olefin copolymer rubber and an ethylene-α-olefin-non-conjugated diene copolymer rubber may be mixed and used as long as the object of the present invention is not impaired. Oil-extended rubber may be used as the ethylene-α-olefin-based copolymer rubber.

Preferable specific examples of the ethylene-α-olefin copolymer rubber include ethylene-butadiene having a propylene or butene content of 5 to 80% by weight, preferably 10 to 60% by weight, more preferably 15 to 50% by weight. Propylene copolymer rubber can be used.

[0013] Ethylene-α-olefin copolymer rubber
Is the Mooney viscosity at 100 ° C. (ML _{1 + 4} 100 ℃) is 5
To 150, more preferably 10 to 10
0. If the Mooney viscosity is too low, the mechanical strength
If the Mooney viscosity is too high,
The appearance of the shape may be impaired.

The weight ratio of (A) / (B) in the thermoplastic elastomer composition of the present invention is usually from 60/40 to
It is 10/90. If (A) is too small ((B) is too large), the fluidity may be reduced and sheet workability may be impaired, whereas if (A) is too small ((B) is too small), flexible thermoplasticity may be obtained. An elastomer may not be obtained. In addition,
In the present invention, when the oil-extended rubber is used as (B), the amount and Mooney viscosity of (B) are based on the value including the extension oil.

The component (C) of the present invention is an additive for a resin. The component (C) will be described later in detail.

[0016] The thermoplastic elastomer composition of the present invention comprises:
It contains the above components (A) to (C), and
Heating temperature was set to 100 ° C. using an apparatus conforming to the specification of No. 52, and the haze of the glass plate measured 20 hours after heating was 1
It is at most 5%, preferably at most 10%. Here, ISO stands for International Organa.
nization for Standardarizati
means on (International Organization for Standardization). If the haze is excessive, the object of the present invention of providing a thermoplastic elastomer composition for automobile interiors having improved fogging resistance and the thermoplastic elastomer composition cannot be achieved.

The device conforming to the provisions of ISO6452 is
For example, the apparatus shown in FIG. Where the oil bath,
The cooling plate has temperature control, the metal ring is chrome plated, and the annular packing is made of silicone rubber.

In the fogging measurement, the temperature of the oil bath is adjusted to 100 ± 2 ° C., the temperature of the cooling plate is adjusted to 20 ± 2 ° C., and the sample is 80 mmφ × 0.5 mmt. The sample was heated in a beaker for 20 hours,
The haze of the glass plate is measured after 1 ± 0.1 hour in an environment of 3 ± 2 ° C. and 50% RH.

Next, preferred embodiments of the present invention will be described, focusing on the component (C).

Of (C), the content of the following (C1) per 100 parts by weight of the total of (A) and (B) is 0.05
0.6 parts by weight, (A) and (B) of the following (C2)
Is contained in an amount of 0.05 to 0.
4 parts by weight or less, and the content of the following (C3) per 100 parts by weight of the total of (A) and (B) is 0.12.
It is preferable that the amount is not more than part by weight.

(C1): The following (condition 1) and (condition 2)
(C2): Additive for resin that satisfies only one of the following (Condition 1) and (Condition 2) (C3): (Condition 1) And an additive for resin that does not satisfy any of the conditions (condition 2) (condition 1): 10 measured by TG (differential scanning calorimeter)
Weight% heating loss is 300 ° C or more (Condition 2): Melting point measured by TG is 80 ° C or more

Here, the measurement conditions of TG (differential scanning calorimeter) in (condition 1) are as follows: under nitrogen atmosphere, heating rate 20 ° C./m
in.

(C1) is the above (condition 1) and (condition 2)
Satisfies both conditions, and preferably has a molecular weight of 300 to 1500, preferably 500 to 12
A phenolic antioxidant, a phosphorus-based antioxidant and / or a fatty acid amide having 20 to 25 carbon atoms. If the molecular weight is too small, there may be poor fogging resistance,
On the other hand, if the molecular weight is excessively large, the antioxidant effect and the quick-acting property of slipperiness may be lacking.

Specific examples of (C1) include pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, tris (2,4-di-t-
(Butylphenyl) phosphite and erucamide.

The content of (C1) in the thermoplastic elastomer composition of the present invention is preferably 0.05 to 0.6 parts by weight, more preferably 100 parts by weight of the total amount of (A) and (B). 0.10 to 0.5 parts by weight.
If the content of (C1) is too small, the heat resistance and the slipperiness of the resin may be poor. On the other hand, if the content of (C1) is too large, the fogging resistance may be poor.

(C2) is the above (condition 1) and (condition 2)
A hindered amine-based light stabilizer and / or a hydroxybenzotriazole-based light stabilizer having a molecular weight of preferably from 200 to 1,000, and more preferably from 300 to 500. If the molecular weight is too small, the fogging resistance may be poor. On the other hand, if the molecular weight is too large, the fast-acting weathering effect may be lacking.

Specific examples of (C2) include 2- (2-hydroxy-3-t-butyl-5-methylphenyl) -5
-Chlorobenzotriazole or bis (2,2,6,6
-Tetramethyl-4-piperidyl) sebacate.

The content of (C2) in the thermoplastic elastomer composition of the present invention is preferably 0.05 to 0.4 part by weight, more preferably 100 parts by weight of the total amount of (A) and (B). 0.10 to 0.30 parts by weight.
If the content of (C2) is too small, the light resistance may be poor. On the other hand, if the content of (C2) is too large, the fogging resistance may be poor.

(C3) is the above (condition 1) and (condition 2)
Is a resin additive that does not satisfy any of the conditions described above, and is preferably a phenolic antioxidant or a lubricant having a molecular weight of 300 or less, and specific examples thereof include 10 to 20 carbon atoms.
Fatty acid amides. In addition, molecular weight 3
As a phenolic antioxidant of not more than 00, 2,6-di-t-butyl-4-hydroxytoluene, having 10 to 10 carbon atoms
Specific examples of the fatty acid amide of No. 20 include oleic amide.

The content of (C3) in the thermoplastic elastomer composition of the present invention is preferably 0.12 parts by weight or less, more preferably 0.12 parts by weight, per 100 parts by weight of the total of (A) and (B). Not more than parts by weight. If the content of (C3) is excessive, fogging resistance may be poor.

The thermoplastic elastomer composition of the present invention comprises:
In addition to the above components, various auxiliary materials, rubbers, thermoplastic elastomers, olefin resins, and the like can be contained as necessary in a range that does not impair the object of the present invention.

Examples of various auxiliary materials include coloring pigments and fillers such as fillers and calcium carbonate. Rubbers include natural rubber, butyl rubber, chloroprene rubber, acrylonitrile-butadiene rubber, hydrogenated acrylonitrile-butadiene rubber, epichlorohydrin rubber, acrylic rubber, styrene-butadiene rubber, hydrogenated styrene-butadiene rubber, butadiene rubber, hydrogenated Examples include conjugated diene rubbers such as butadiene rubber. As the thermoplastic elastomer, styrene-based thermoplastic elastomers such as styrene-butadiene block copolymer, hydrogenated styrene-butadiene block copolymer, styrene-isoprene block copolymer, hydrogenated styrene-isoprene block copolymer, polyester Thermoplastic elastomer, polyamide-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, and the like. Examples of the olefin resin include polyethylene and polypropylene.

The thermoplastic elastomer composition of the present invention comprises:
It can be obtained as a crosslinked composition or a non-crosslinked composition by a usual method. For example, crosslinked thermoplastic elastomer compositions are disclosed in JP-A-48-26838, JP-A-1-103639, and Japanese Patent Application No. 7-249442.
The method can be obtained by a method disclosed in, for example, US Pat.

The obtained crosslinked composition or non-crosslinked composition may further contain various auxiliary materials, rubbers, thermoplastic elastomers, and olefin-based resins, if necessary, as long as the object of the present invention is not impaired. It is also possible to include them.

The method for producing a molded article obtained by molding the thermoplastic elastomer composition of the present invention is not particularly limited, and examples thereof include extrusion molding, press molding, injection molding, and powder slush molding. Powder molding method, vacuum molding method and the like can be mentioned.

The molded article obtained by molding the thermoplastic elastomer composition of the present invention is optimally used as a skin material for automobile interior parts such as instrument panels by utilizing the above-mentioned excellent characteristics.

Further, it can be used as a two-layer molded article in which a foam layer is laminated on one surface side. Such a two-layer molded article can be produced by molding a foam produced separately on a molded article made of the thermoplastic elastomer composition of the present invention by a thermocompression bonding method or an adhesive method using an adhesive, or by powder molding. It can also be integrally manufactured by a method (see Japanese Patent Application Laid-Open No. 5-473 and the like).

Examples of the foam to be adhered include a polypropylene foam and a polyurethane foam obtained by an electron beam crosslinking method.

The molded article made of the above-mentioned thermoplastic elastomer composition can also be used as a multilayer molded article in which a thermoplastic resin core is laminated on one side. Further, the above-described two-layer molded body can be used as a multilayer molded body in which a thermoplastic resin core is laminated on the foam layer side.

[0040]

Next, the present invention will be described by way of examples. The test methods used for measuring the physical properties are as follows.

(1) Mooney viscosity (ML _{1 + 4 at} 100 ° C.) Measured according to ASTM D927-57T. EP
DM was calculated by the following equation. _{log (ML 1 / ML 2)} ) = 0.0066 (△ PH
R) ML ₁ : Mooney viscosity of EPDM ML ₂ : Mooney viscosity of oil-extended EPDM ΔPHR: Oil-extended amount per 100 parts by weight of EPDM

(2) Melt flow rate (MFR) Measured under the following conditions in accordance with JIS K-7210. Polypropylene: temperature 230 ° C, load 2.16 kg Polyethylene: temperature 190 ° C, load 2.16 kg

(3) Fogging resistance The haze of a glass lid subjected to a fogging test in accordance with ISO 6452 was measured in accordance with JIS K7105.

Example 1 Method for producing a thermoplastic elastomer

(1) TPO-1 EPM-1 (ethylene-propylene copolymer rubber, propylene content = 22% by weight, ML _{1 + 4} 100 ° C. = 35)
70 parts by weight of polypropylene-1 (MFR = 10 g / 1
0 minutes, homo type) 30 parts by weight and N,
0.4 parts by weight of N′-m-phenylenebismaleimide (“Sumifine BM” manufactured by Sumitomo Chemical Co., Ltd.), and Sumisorb 300 @ 2- (2-hydroxy-3) as a light stabilizer
-T-butyl-5-methylphenyl) -5-chlorobenzotriazole, molecular weight = 316: manufactured by Sumitomo Chemical Co., Ltd.
0.05 parts by weight, Irganox 101 as heat stabilizer
0 ｛pentaerythrityl-tetrakis [3- (3,5-
Di-t-butyl-4-hydroxyphenyl) propionate], molecular weight = 1177, manufactured by Ciba-Geigy {0.
1 part by weight with a Banbury mixer at 170-200 ° C x 7
After mixing and kneading, a pelletized master batch was prepared using an extruder. Next, 0.04 parts by weight of 2,5-dimethyl-2,5-di (t-butylperoxy) hexane per 100 parts by weight of the master batch was uniformly blended for 3 minutes using a Henschel mixer. The obtained blend is twin-screw extruder (TEX-4 manufactured by Nippon Steel Works, Ltd.).
Using 4HC), a dynamic heat treatment was performed at 240 to 260 ° C. for about 30 seconds to obtain a partially crosslinked thermoplastic elastomer pellet (hereinafter, referred to as “TPO-1”).

(2) TPO-2 In the process for producing TPO-1, EPO-1 was used instead of EPM-1.
PDM-1 (ethylene-propylene-ethylidene norbornene (ENB) copolymer rubber, iodination = 12, propylene content = 28% by weight, ML _{1 + 4} 100 ° C. = 24
EPDM-1 10 in a 5% by weight hexane solution of 2)
Oil-extended EPDM-1 (ML ₁₎ obtained by adding 100 parts by weight of a mineral oil-based softening agent (“Diana Process Oil PW-380” manufactured by Idemitsu Kosan Co., Ltd.) per 0 parts by weight and then removing the solvent by steam stripping. ₊₄ 100 ° C = 53) 85
Parts by weight and polypropylene-2 (MFR = 1 g / 10 min,
Random type) 15 parts by weight and N,
0.4 parts by weight of N'-m-phenylenebismaleimide, 0.2 parts by weight of Sumisorb 300 as a light stabilizer, 0.15 parts by weight of Irganox 1010 as a heat stabilizer, and Neutron S (erucic acid as a lubricant) Amide, manufactured by Nippon Seika Co., Ltd.) Except that the amount was changed to 0.1 part by weight, a thermoplastic elastomer pellet (hereinafter, referred to as “TPO-2”) produced in the same manner as TPO-1 was obtained by partially crosslinking. .

Thermoplastic elastomer for skin of automobile instrument panel
Preparation of sheet 56 parts by weight of the above-mentioned TPO-1, 24 parts by weight of TPO-2, polyethylene {MFR = 2, Irganox 1076} octadecyl-3- (3,5-di-
t-butyl-4-hydroxyphenyl) propionate, molecular weight = 530, 0.15 parts by weight, manufactured by Ciba-Geigy, Irgafos 168 [Tris (2,4-di-t-
Butylphenyl) phosphite, molecular weight = 647, manufactured by Ciba-Geigy Co.] 0.12 parts by weight. # 20 parts by weight, 0.12 parts by weight of additive Sumisorb 300, 0.05 parts by weight of Irganox 1010, Sanol LS-
770 [bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, molecular weight = 481, manufactured by Sankyo Co., Ltd.]
After blending 0.05 parts by weight with a Henschel mixer, a twin-screw extruder (TEX-44HC manufactured by Nippon Steel Works, Ltd.)
And kneaded at 240 to 260 ° C. for about 30 seconds to obtain thermoplastic elastomer pellets. Then 25mmφT
A sheet was obtained using a die extrusion sheet processing machine. A fogging test was performed on a sample cut out from the sheet at 80 mmφ.

Example 2 A thermoplastic elastomer sheet was prepared in the same manner as in Example 1 except that 0.2 parts by weight of Neutron S was added as a lubricant in the production of the thermoplastic elastomer sheet for the skin of an automobile instrument panel of Example 1. Pellets and sheets were obtained. A fogging test was performed using this sheet. Table 2 shows the evaluation results.

Example 3 Example 1 was repeated except that 0.1 part by weight of Denon SL-1 (manufactured by Marubishi Yuka Co., Ltd.) was added as a lubricant in the production of the thermoplastic elastomer sheet for the skin of an automobile instrument panel of Example 1. In the same manner as described above, thermoplastic elastomer pellets and sheets were obtained. A fogging test was performed using this sheet. Table 2 shows the evaluation results.

Comparative Example 1 In the production of the thermoplastic elastomer sheet for the skin of an automobile instrument panel of Example 1, Sumisorb 300 was used as a light stabilizer.
Was added in the same manner as in Example 1 except that 0.2 parts by weight of was added to obtain thermoplastic elastomer pellets and a sheet.
A fogging test was performed using this sheet. Table 2 shows the evaluation results.

Comparative Example 2 Example 1 was repeated except that 0.2 part by weight of Denon SL-1 (manufactured by Marubishi Yuka Co., Ltd.) was added as a lubricant in the production of the thermoplastic elastomer sheet for the skin of an automobile instrument panel of Example 1. In the same manner as described above, thermoplastic elastomer pellets and sheets were obtained. A fogging test was performed using this sheet. Table 2 shows the evaluation results.

The following can be seen from the results. Embodiments satisfying the conditions of the present invention have shown satisfactory results. On the other hand, the haze of fogging measured 20 hours after heating using an apparatus conforming to the standard of ISO6452 and having a heating temperature of 100 ° C. is larger than that of the present invention, and Comparative Examples 1 and 2 are inferior in fogging resistance.

[0053]

[Table 1] Properties of additive ^{* 1} used ----------------------------------------------- Molecular weight: 10 ° C Temperature ℃ C1 Irganox 1010 1177 114 370 Irganox 1076 530 143 352 Irgafos 168 647 166 310 Neutron S 338 82 305 C2 Smisorb 300 316 144 266 Sanol LS770 481 83 294 C3 Denon SL-1 281 75 282 −−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

* 1 Additive Irganox 1010 : pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], molecular weight = 1177, heat stable manufactured by Ciba Geigy Agent Irganox 1076 : octadecyl-3- (3,5
-Di -t-butyl-4-hydroxyphenyl) propionate, molecular weight = 530, heat stabilizer Irgafos 168 manufactured by Ciba-Geigy: tris (2,4-di-t-butylphenyl) phosphite, molecular weight = 647, Thermal stabilizer Neutron S manufactured by Ciba-Geigy Co., Ltd .: Erucamide , Lubricant Sumisorb 300 manufactured by Nippon Seika Co., Ltd .: 2- (2-hydroxy-3-t-butyl-5-methylphenyl) -5-chlorobenzo Triazole, molecular weight = 316: light stabilizer SANOL LS-770 manufactured by Sumitomo Chemical Co., Ltd .: bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, molecular weight = 48
1. Denon SL-1: Oleic acid amide (molecular weight = 281: manufactured by Sankyo)
Lubricant manufactured by Maruzen Yuka Co., Ltd. Measuring equipment: Standard type (TAS100 manufactured by Rigaku Denki Co., Ltd.)
/ TG8110) Measurement conditions: Heating rate 20 ° C / min Under nitrogen atmosphere

[0055]

Table 2 Formulation for manufacturing thermoplastic elastomer sheet for automobile instrument panel skin (parts by weight) --------- Example Comparative example 1 2 3 1 2 Resin A 40.4 40.4 40.4 40.4 40.4 B 59.6 59.6 59.6 59.6 59.6 Additive C1 0.27 0.47 0.27 0.27 0.27 C2 0.25 0.25 0.25 0.45 0.25 C3 0 0 0.1 0 0.2 ISO haze% * 2 3 4 10 17 29 Evaluation result Fogging resistance ○ ○ ○ × × −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

As for the additives, the content per 100 parts by weight of the resin * 2 The haze of the glass plate measured at 20 ° C. after the heating at a heating temperature of 100 ° C. using an apparatus conforming to the rules of ISO6452. In consideration of the standard, an apparatus according to ISO6452 is used, the heating temperature is set to 100 ° C.
When the haze of the glass plate measured after 0 hour was 15% or less, it was evaluated as ○, and when the haze exceeded 15, it was evaluated as ×.

[0057]

As described above, according to the present invention, a thermoplastic elastomer composition for automotive interiors, which maintains heat resistance, light resistance and the like at a satisfactory high level and has improved fogging resistance, and the thermoplastic elastomer composition It was possible to provide automotive interior parts using products.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fogging haze measuring device according to ISO6452.

Claims (12)

[Claims] 1. The method according to claim 1, which comprises the following (A) to (C) and
Heating temperature was set to 10 using an apparatus conforming to O6452.
A thermoplastic elastomer composition for automobile interiors wherein the haze of a glass plate measured at 0 ° C. and 20 hours after heating is 15% or less. (A): Olefin resin (B): Ethylene-α-olefin copolymer rubber (C): Additive for resin 2. The thermoplastic elastomer composition for automobile interior according to claim 1, wherein (A) is polypropylene and / or polyethylene. 3. The thermoplastic elastomer composition according to claim 1, wherein (B) is an ethylene-α-olefin copolymer rubber or an ethylene-α-olefin-nonconjugated diene copolymer rubber. 4. The thermoplastic elastomer composition according to claim 1, wherein (B) is an ethylene-propylene copolymer rubber. 5. The content of (C1) in the following (C1) per 100 parts by weight of the total of (A) and (B) is 0.05.
0.6 parts by weight, (A) and (B) of the following (C2)
Is contained in an amount of 0.05 to 0.
4 parts by weight or less, and the content of the following (C3) per 100 parts by weight of the total of (A) and (B) is 0.12.
The thermoplastic elastomer composition for an automobile interior according to claim 1, which is not more than part by weight. (C1): Additive for resin that satisfies both of the following (condition 1) and (condition 2) (C2): satisfies only one of the following (condition 1) and (condition 2) Additive for resin (C3): Additive for resin that does not satisfy any of the following (condition 1) and (condition 2) (Condition 1): Measured by TG (differential scanning calorimeter) 10
Weight% heating loss is 300 ° C or more (Condition 2): Melting point measured by TG is 80 ° C or more 6. The thermoplastic elastomer composition according to claim 1, wherein (C) is a heat stabilizer, a light stabilizer, a lubricant or an anti-aging agent. 7. A phenolic antioxidant and / or a phosphorus antioxidant having a molecular weight of 200 to 1500, a hindered amine lightproofing agent and / or a hydroxybenzotriazole lightproofing agent having a molecular weight of 200 to 1000, carbon number The thermoplastic elastomer composition for automobile interior according to claim 1, which is a fatty acid amide and / or bis fatty acid amide-based lubricant of 10 to 25. 8. (C1) is pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl-3-
(3,5-di-t-butyl-4-hydroxyphenyl)
The thermoplastic elastomer composition for automobile interiors according to claim 5, which is propionate, tris (2,4-di-t-butylphenyl) phosphite or erucamide. 9. (C2) is 2- (2-hydroxy-3)
The thermoplastic elastomer composition according to claim 5, which is -t-butyl-5-methylphenyl) -5-chlorobenzotriazole or bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate. . 10. The method according to claim 10, wherein (C3) is 2,6-di-t-butyl-
6. The thermoplastic elastomer composition for automobile interior according to claim 5, which is 4-hydroxytoluene or oleamide. 11. An automotive interior part obtained by using the thermoplastic elastomer composition according to claim 1. 12. The automobile interior part according to claim 11, wherein the automobile interior part is an instrument panel.