JPH10306213A - Resin composition for exterior part of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin composition for an exterior part of a vehicle having excellent stiffness and tenacity simultaneously, especially excellent in surface impact destruction characteristics at a high speed, and also excellent in well- balanced surface appearance and dimensional stability of the formed product thereof. SOLUTION: This resin composition is obtained by melt-mixing 5-150 pts.wt. non-fibrous inorganic filler having 0.05-10 μm means particle diameter and/or fibrous inorganic filler having 0.05-10 μm fiber diameter other than the glass fiber and 0.05-10 pts.wt. olefinic compound having carboxylic acid anhydride group in its molecule or a polymer of the olefinic compound, based on 100 pts.wt. nylon resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for vehicle exterior parts which has both excellent stiffness and toughness, especially excellent high-speed surface impact fracture characteristics, and a good balance of surface appearance and dimensional stability of molded products. And a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, various plastic materials have been used for vehicle exterior parts, especially automobile exterior parts. However, automotive exterior parts such as resin outer plates, wheel caps, spoilers, and the like using plastics have been used. The demand for higher performance of parts is increasing. For example, a high level of dimensional stability, coating heat resistance and impact resistance are required for resin outer panels for automobiles, and wheel caps are also required to have impact resistance, low warpage and heat resistance. In addition, it is required to reduce the weight of vehicle exterior parts, and to reduce the weight, it is necessary to improve rigidity and reduce the thickness. In response, attempts have been made to improve the properties of thermoplastic resin materials for vehicle exterior parts, but it is a difficult task to satisfy all the properties.

For example, when a material containing an elastomer component is molded for the purpose of increasing the impact strength of a part, only a material having impaired heat resistance and rigidity can be obtained, and conversely, the heat resistance and rigidity of the part are increased. Therefore, if a material containing various inorganic fillers and reinforcing agents is molded, the Izod impact strength and the surface impact strength are impaired. Therefore, it is not possible to obtain a vehicle exterior part having simultaneously improved impact strength and heat resistance or rigidity. Have difficulty.

[0004] Further, by molding a material containing a fibrous reinforcing agent such as glass fiber, a component having excellent rigidity and heat resistance and at the same time having improved Izod impact strength can be obtained. The surface impact strength is lower than that of the non-reinforced system, and is not always preferable for vehicle exterior parts such as a decrease in elongation and an anisotropy of mechanical properties.

Further, as disclosed in JP-A-62-253652, a polyamide having a high glass transition temperature such as a polyphenylene ether resin, a rubbery polymer, and an unsaturated carboxylic acid are melt-kneaded with a polyamide to obtain an impact resistance. Attempts to achieve both heat resistance and heat resistance have been disclosed, but the heat resistance, dimensional stability is insufficient, and even if an inorganic filler is added, the impact resistance and the decrease in high-speed surface impact fracture characteristics are reduced. A material with large and sufficient properties could not be obtained.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned problems, that is, it has both excellent rigidity and toughness, especially excellent high-speed surface impact characteristics and a molded product surface appearance.
It is an object of the present invention to obtain a resin composition for vehicle exterior parts having excellent characteristics with balanced dimensional stability.

[0007]

Means for Solving the Problems The present inventors have studied to solve the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention relates to (1) 100 parts by weight of (A) nylon resin, and (B) a non-fibrous inorganic filler having an average particle diameter of 0.05 to 10 μm and / or a fiber diameter of 0% excluding glass fibers. A vehicle characterized by being obtained by melt-kneading an olefin compound having a carboxylic acid anhydride group in a molecule or a polymer of the olefin compound or a polymer of (C) a carboxylic acid anhydride group in a molecule. The resin composition for exterior parts, (2) (C) an olefin compound having a carboxylic acid anhydride group in the molecule or a polymer of the olefin compound is added to 0.05 parts by weight of (A) 100 parts by weight of the nylon resin.
(1) The resin composition for vehicle exterior parts according to (1), wherein the nylon resin is selected from aliphatic nylon resins having a melting point of 200 ° C. or more. (4) The resin composition for vehicle exterior parts according to any one of (1) and (2) above, wherein (4) the nylon resin is at least one selected from nylon 66 and nylon 6. The resin composition for vehicle exterior parts according to any one of (1) to (3), and (5) the olefin compound is selected from maleic anhydride, itaconic anhydride, glutaconic anhydride, citraconic anhydride, and aconitic anhydride. (1) The resin composition for vehicle exterior parts according to any one of (1) to (4) above, wherein (6) the polymer of the olefin compound is polymaleic anhydride.
The resin composition for vehicle exterior parts according to any one of (1) to (4),
(7) The resin composition for vehicle exterior parts according to any one of (1) to (6) above, wherein the inorganic filler is selected from kaolin, wollastenite, and talc, and (8) the inorganic filler is kaolin. (1) The resin composition for vehicle exterior parts according to any one of (1) to (6), and (9) the inorganic filler when the resin composition for vehicle exterior parts is dissolved in hexafluoroisopropanol and the inorganic filler is recovered. (1) to (2), wherein the amount of the nylon resin component adhering to the inorganic filler is 4 g / m ² or more per unit surface area of the inorganic filler measured by the BET method.
(8) The resin composition for vehicle exterior parts according to any one of the above,
(10) (A) For 100 parts by weight of nylon resin,
(B) a non-fibrous inorganic filler having an average particle diameter of 0.05 to 10 μm and / or a fiber diameter of 0.05 excluding glass fibers
Resin for vehicle exterior parts characterized by melt-kneading 5 to 150 parts by weight of a fibrous inorganic filler of 10 to 10 [mu] m and (C) an olefin compound having a carboxylic anhydride group in a molecule or a polymer of these olefin compounds. (11) The resin composition for a vehicle exterior component according to any one of the above (1) to (9), wherein the vehicle exterior component is a resin composition for a wheel cap, and (12) the above (1). ~
(9) A vehicle exterior part comprising the resin composition for a vehicle exterior part according to any one of (9).

[0008]

Embodiments of the present invention will be described below. In the present invention, “weight” means “mass”.

The nylon resin used in the present invention is a nylon containing amino acids, lactams or diamines and dicarboxylic acids as main components. Representative examples of the monomer that forms the main component include amino acids such as 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and paraaminomethylbenzoic acid;
Lactams such as aminocaprolactam and ω-laurolactam, tetramethylenediamine, hexamerenediamine, 2-methylpentamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4-
/ 2,4,4-trimethylhexamethylenediamine, 5
-Methylnonamethylenediamine, metaxylenediamine, paraxylylenediamine, 1,3-bis (aminomethyl) cyclohexane, 1,4-bis (aminomethyl)
Cyclohexane, 1-amino-3-aminomethyl-3,
5,5-trimethylcyclohexane, bis (4-aminocyclohexyl) methane, bis (3-methyl-4-aminocyclohexyl) methane, 2,2-bis (4-aminocyclohexyl) propane, bis (aminopropyl) piperazine, amino Aliphatic, alicyclic, and aromatic diamines such as ethylpiperazine, and adipic acid, spearic acid, azelaic acid, sebacic acid, dodecanedioic acid, terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, and 2-chloroterephthalic acid
Aliphatic, alicyclic, such as methyl terephthalic acid, 5-methyl isophthalic acid, 5-sodium sulfoisophthalic acid, hexahydroterephthalic acid, and hexahydroisophthalic acid;
An aromatic dicarboxylic acid is mentioned, and in the present invention,
Nylon homopolymers or copolymers derived from these raw materials can be used alone or in the form of a mixture.

In the present invention, a particularly useful nylon resin is a nylon resin having a melting point of 200 ° C. or more and excellent in heat resistance and strength. Specific examples thereof include polycaproamide (nylon 6) and polyhexamethylene. Adipamide (nylon 66), polytetramethylene adipamide (nylon 46), polyhexamethylene sebacamide (nylon 610), polyhexamethylene dodecamide (nylon 612), polyhexamethylene adipamide / polyhexamethylene Terephthalamide copolymer (nylon 66 /
6T), polyhexamethylene adipamide / polyhexamethylene isophthalamide copolymer (nylon 66/6
I), polyhexamethylene adipamide / polyhexamethylene terephthalamide / polyhexamethylene isophthalamide copolymer (nylon 66 / 6T / 6I), polyxylylene adipamide (nylon XD6), and mixtures or copolymers thereof Is mentioned.

Particularly preferred are nylon 6, nylon 66, nylon 610, nylon 6/66.
Examples thereof include copolymers, nylon 6/12 copolymers, and the like.
It is practically suitable to use the mixture as a mixture depending on the required properties such as heat resistance, toughness, and surface properties.

The degree of polymerization of these nylon resins is not particularly limited, and the relative viscosity measured at 25 ° C. in a 1% concentrated sulfuric acid solution is in the range of 1.5 to 5.0, particularly 2.0 to 4.0. Those in the range of 0 are preferred.

In the present invention, the non-fibrous inorganic filler having an average particle size of 0.05 to 10 μm used as the component (B) includes wollastenite, zeolite, sericite, kaolin, mica, clay, pyrophyllite, and the like. Silicates such as bentonite, asbestos, talc, alumina silicate, etc., metal compounds such as alumina, silicon oxide, magnesium oxide, zirconium oxide, titanium oxide, iron oxide, carbonates such as calcium carbonate, magnesium carbonate, dolomite, calcium sulfate, sulfuric acid Non-fibrous fillers such as sulfates such as barium, hydroxides such as magnesium hydroxide, calcium hydroxide and aluminum hydroxide, glass beads, ceramic beads, boron nitride, silicon carbide and silica, which are hollow. And furthermore, It may be used in combination agent of two or more. Of these, particularly preferred fillers are talc, wollastenite, clay, and kaolin. Kaolin is most preferred for imparting a good balance of ductility and rigidity.

These non-fibrous inorganic fillers need to have an average particle size of 0.05 to 10 μm, and if the average particle size is less than 0.05 μm, the non-fibrous inorganic filler may be agglomerated. It is not preferable because it lowers the ductility and the surface of the molded product. When the particle diameter exceeds 10 μm, ductility and deterioration of the surface of the molded product are remarkable. The average particle size is preferably 0.1 to 5 μm, more preferably 0.1 to 5 μm.
３3 μm. In addition, these average particle diameters can be measured by a sedimentation method.

Specific examples of the fibrous inorganic filler having a fiber diameter of 0.05 to 10 μm excluding glass fiber used as the component (B) include potassium whisker, zinc oxide whisker, aluminum borate whisker, alumina fiber, and carbon fiber. Silicon fiber, ceramic fiber, asbestos fiber, stone fiber,
It is a fibrous filler such as a metal fiber, a fibrous calcium carbonate, and a fibrous wollastenite, and two or more of these fillers can be used in combination. Among these, particularly preferred fillers are fibrous wollastenite and fibrous calcium carbonate. When glass fiber is used, the reason is not clear, but the effect of improving ductility is small, which is not preferable.

The fiber diameter of these fibrous inorganic fillers is 0.1.
It is necessary that the fiber diameter is 0.5 to 10 μm.
If the thickness is less than 05 μm, the fibrous inorganic filler is apt to aggregate, which is unfavorable because it lowers the ductility and the surface of the molded product. When the fiber diameter exceeds 10 μm, ductility and deterioration of the surface of the molded product are remarkable. The fiber diameter is preferably from 0.1 to 8 μm, more preferably from 1 to 6 μm. In addition, these fiber diameters are number average fiber diameters measured by using a microscope such as an electron microscope.

It is more advantageous to use these inorganic fillers after pretreating them with a coupling agent such as an isocyanate compound, an organic silane compound, an organic titanate compound, an organic borane compound or an epoxy compound. It is preferable from the viewpoint of obtaining the target strength. Particularly preferred are organic silane compounds, specific examples of which are γ-glycidoxypropyltrimethoxysilane, γ
-Glycidoxypropyltriethoxysilane, β-
Epoxy group-containing alkoxysilane compounds such as (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-
Mercapto group-containing alkoxysilane compounds such as mercaptopropyltriethoxysilane, and ureido group-containing alkoxy such as γ-ureidopropyltriethoxysilane, γ-ureidopropyltrimethoxysilane, and γ- (2-ureidoethyl) aminopropyltrimethoxysilane Silane compounds, γ-isocyanatopropyltriethoxysilane, γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldimethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylethyldimethoxysilane, γ An isocyanato group-containing alkoxysilane compound such as -isocyanatopropylethyldiethoxysilane, γ-isocyanatopropyltrichlorosilane, γ- (2
Amino-containing alkoxysilane compounds such as -aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-hydroxypropyltrimethoxysilane, γ- Hydroxy group-containing alkoxysilane compounds such as hydroxypropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, N-β- (N-vinylbenzylaminoethyl) -γ-aminopropyltrimethoxysilane hydrochloride And other alkoxysilane compounds containing a carbon-carbon unsaturated group. In particular, γ-methacryloxypropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane,
γ- (2-aminoethyl) aminopropyltrimethoxysilane and γ-aminopropyltrimethoxysilane are preferably used. These, silane coupling agent according to a conventional method, a surface treatment of the filler in advance, and then a method of melt-kneading with the polyamide resin is preferably used,
When the filler and the polyamide resin are melt-kneaded without performing the surface treatment of the filler in advance, a so-called integral blending method of adding these coupling agents may be used.

In the present invention, the amount of the inorganic filler relative to 100 parts by weight of the nylon resin is from 5 to 150 parts by weight in terms of the total amount of the non-fibrous inorganic filler and the fibrous inorganic filler. A range of parts by weight is more desirable. Especially from the balance between toughness and rigidity, and high-speed surface impact fracture characteristics, 10 to 45
Parts by weight are preferred.

Although it is a preferable method to improve impact resistance and high-speed surface impact by adding an inorganic filler in advance by coating with an elastomer, the effect of improving rigidity tends to be small.

Specific examples of the olefin compound having a carboxylic anhydride group in the molecule or a polymer of these olefin compounds used as the component (C) in the present invention include:
Maleic anhydride, itaconic anhydride, glutaconic anhydride,
Examples thereof include citraconic anhydride, aconitic anhydride, and polymers of these substituted olefin compounds. In addition,
Styrene, isobutylene, methacrylate, acrylate, etc.
An olefin other than the olefin compound having a carboxylic anhydride group in the molecule may be copolymerized within a range not impairing the effects of the present invention, but an olefin compound having a carboxylic acid anhydride group in the molecule substantially. It is preferred to consist of a polymer of. The polymerization degree of the olefin compound polymer is preferably 2 to 100, more preferably 2 to 50, and most preferably 2 to 20. Among these, maleic anhydride and polymaleic anhydride are most preferably used because of their high ductility and rigidity-imparting effects. Examples of polymaleic anhydride include, for example, J. Macromol. Sci.-Revs. Ma
Cromol. Chem., C13 (2), 235 (1975) and the like can be used.

The addition amount of these olefin compounds or polymers of these olefin compounds is from 0.05 to 10 parts by weight per 100 parts by weight of the nylon resin, and the effect of improving ductility is obtained.
It is preferable from the viewpoint of fluidity of the composition, more preferably 0.1 to 5 parts by weight, further preferably 0.1 to 3 parts by weight, and further preferably 0.1 to 1 part by weight.
Parts by weight.

The olefin compound having a carboxylic anhydride group in the molecule or a polymer of these olefin compounds used herein may have an anhydride structure when substantially melt-kneaded with a nylon resin. The compound or the polymer of the olefin compound is hydrolyzed and subjected to melt-kneading in the form of a carboxylic acid or an aqueous solution thereof. It may be kneaded.

In the present invention, when the non-fibrous inorganic filler and / or the polyamide resin component adhering to the fibrous inorganic filler which is recovered by dissolving the resin composition in hexafluoroisopropanol is larger than a predetermined amount, It is preferable because of its excellent toughness, surface smoothness and high-speed surface impact fracture characteristics. Specifically, the adhesion amount is preferably 4 g / m ² or more, and particularly preferably 5 g / m ² or more.

The adhesion amount of the polyamide resin component can be determined as follows. The polyamide composition is dissolved in hexafluoroisopropanol to a concentration of 10% by weight. The obtained suspension is centrifuged to settle the inorganic filler and separated. The inorganic filler thus separated is suspended again in hexafluoroisopropanol so as to have a concentration of 10% by weight, separated by a centrifugal separator and collected, and dried by a vacuum dryer until no residual solvent is left. The obtained filler is measured with an infrared spectrophotometer, and the polyamide resin component adhering to the filler is quantified from the calibration curve of the characteristic absorption of the polyamide and the characteristic absorption of the filler (hereinafter referred to as (1) method). ). Also, among the components adhering to the filler, when the nitrogen-containing compound is considered to be substantially only polyamide, the recovered filler is subjected to elemental analysis to determine the nitrogen content and determine the amount of adhered nylon. (Method (2)). Further, when the component adhering to the filler is considered to be substantially a polyamide resin component, for example, the polyamide resin / filler /
In the case of a composition such as (a compound of 1% by weight or less based on 100% by weight of a polyamide resin), the obtained filler is subjected to a thermogravimetric analyzer, and is held in air at 120 ° C. for 5 minutes.
The temperature was raised to 500 ° C at a rate of 20 ° C / min.
By holding for 5 minutes and measuring the heating loss, the substantial amount of the polyamide resin component adhering to the filler can be determined (method (3)). In addition, when components such as a polymer substantially unnecessary for hexafluoroisopropanol were added as other components to the composition of the present invention, a method of removing them with an appropriate solvent or the like in advance was used. Thereafter, it is necessary to determine the amount of the adhered polyamide resin component by an infrared spectrophotometer or elemental analysis as described above.

In the present invention, glass fibers may be used in combination with the above-mentioned inorganic filler within a range not to impair the effects of the present invention. At this time, it is desirable that the adhesion amount is 4 g / m ² or more including glass fiber as an inorganic filler.

Conventionally, when a material having poor compatibility with polyamide, such as polyolefin or polyphenylene oxide, is alloyed with polyamide, melt-kneading of polyolefin or polyphenylene oxide with maleic anhydride in the presence of peroxide is required. In this way, maleic anhydride is graft-polymerized to polyolefin or polyphenylene oxide, and this is further kneaded with polyamide to cause the grafted maleic anhydride to react with the amino group of the polyamide to compatibilize both polymers. I have been. A filler is further added to such a composition (for example, Japanese Patent Application Laid-Open No. 1-3111).
However, in these methods, since the maleic anhydride is consumed mainly for improving the compatibility with nylon, the polyamide resin component adhering to the filler of the present invention is used. In such a case, there is a tendency that the effect of the present invention is insufficient in imparting sufficient ductility.

Further, the resin composition of the present invention comprises an organic phosphorus compound, a crystal nucleating agent such as polyetheretherketone, a coloring inhibitor such as hypophosphite, an antioxidant such as hindered phenol and hindered amine, Heat stabilizer,
Additives such as lubricants, UV inhibitors, colorants and the like can be added.

The method for preparing the resin composition of the present invention is not limited to a specific method, but specific and efficient examples include a raw material nylon resin, an inorganic filler, and a specific olefin compound or a polymer of the olefin. A method in which the mixture is fed to a known melt-kneading machine such as a single-screw or twin-screw extruder, a Banbury mixer, a kneader, and a mixing roll and melt-kneaded at a temperature of 220 to 330 ° C. depending on the melting point of the nylon resin to be used. be able to.

In the resin composition of the present invention, it is preferable that the polyamide component adheres to the filler in a predetermined amount or more.
In order to achieve this, it is desirable to control the kneading conditions sufficiently. For example, when using a melt mixer, L / D (screw length / screw diameter) of the kneader,
It is desirable to control the presence or absence of venting, the kneading temperature, the residence time, the addition position and amount of each component.
In general, it is preferable to increase the L / D and the residence time of the melt kneader in order to increase the amount of the deposit on the filler. In this case, it is preferable that the polyamide and the filler and the specific olefin compound or the polymer of the olefin compound are sufficiently brought into contact during melt-kneading, and it is not preferable to simultaneously present a large amount of other polymer components that inhibit this. For example, the polyphenylene ether may be added to the polyamide resin composition of the present invention within a range that does not impair the effects of the present invention, but the amount is preferably less than 40 parts by weight based on 100 parts by weight of the polyamide.

The resin composition of the present invention thus obtained is excellent in terms of the surface appearance of molded articles, dimensional stability, high-speed surface impact ductile fracture, rigidity and ductility, and is excellent in vehicle exterior parts. It is extremely practical as a resin composition for use. Such a resin composition for vehicle exterior parts is injection molding or extrusion molding,
It is particularly useful when a molded article is produced by blow molding and used as a vehicle exterior part. By taking advantage of this advantage, various vehicle exterior parts for vehicles or luggage such as motorcycles, bicycles, riding toys, carts, etc. It can be suitably used for parts. Examples of automotive exterior parts include fenders,
Exterior materials such as bumpers, bumper fascias, spoilers, wheel caps, center wheel caps,
Jigs for holding luggage outside the vehicle, trunks for outside the vehicle,
Examples include windshields such as trucks and parts thereof, motorcycles include various covers such as cowlings and fenders, gas tanks and the like, and bicycles include mudguards, saddles, and loading platforms.

[0031]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In addition, the blending ratios shown in Examples and Comparative Examples are all parts by weight.

In the following examples, the following methods were used to evaluate the material strength, the surface smoothness of the molded product, the measurement of the adhesion amount of the polyamide component, the measurement of the surface area, and the high-speed surface impact.

[Material strength] Measured according to the following standard method.

Tensile strength: ASTM D638 Flexural modulus: ASTM D790 Izod Impact strength: ASTM D256 [Surface smoothness] A full wheel cap was injection molded using a 14 inch diameter full wheel cap mold for automobiles. The sharpness of the reflected image of the fluorescent lamp was visually observed on the surface of the molded article, and the index was used as an index of smoothness. ：: The outline of the fluorescent lamp is clearly observed, △: The outline of the fluorescent lamp is blurred, and X: The fluorescent lamp is not visible.

[Measurement of Surface Area by BET Method] Melt kneading was carried out, and chips of the obtained resin composition were placed in air for 500 minutes.
The filler obtained as ash was heated for 5 hours at
The measurement was performed using LSORP36 (manufactured by Nippon Bell Co., Ltd.) while adsorbing nitrogen gas.

[Measurement of Adhesion Amount of Polyamide Resin Component to Inorganic Filler] The filler obtained as the ash and the polyamide resin were mixed in a powder state, and infrared absorption was measured using an infrared spectrophotometer. A calibration curve is prepared in advance. Using hexafluoroisopropanol from the polyamide resin composition, the inorganic filler was separated by the method described above, its infrared absorption was measured, and the amount of attached nylon was quantified using a previously measured calibration curve. (Method (1)).

In the case of a composition comprising an olefin compound having a carboxylic anhydride group in the molecule of 1 part by weight or less per 100 parts by weight of the polyamide resin, the inorganic filler and the polyamide resin, or a composition comprising a polymer of the olefin compound. Is
The heating loss value (method (3)) of the inorganic filler recovered with hexafluoroisopropanol was in good agreement with the value obtained by infrared absorption (method (1)) in the error range. Also,
When the nitrogen content of the other additives is 1 part by weight or less with respect to 100 parts by weight of the nitrogen content derived from the polyamide resin in the composition, the polyamide resin component quantitative value by elemental analysis (method (2)) is also red. Value obtained by external absorption ((1) method)
Well matched.

[High-speed surface impact test] A thin flat portion (2 mm thick) of a full wheel cap obtained by injection molding was cut out and used as a servo pulser EHF-U2H-20 manufactured by Shimadzu Corporation.
Using an L-type high-speed surface impact tester, punch tip diameter 5 at 23 ° C
The test was performed at / 8 inch and a collision speed of 2.5 m / s.

Example 1 The melt kneading of a nylon resin, an inorganic filler and a substituted olefin compound or a polymer of a substituted olefin compound was carried out using a twin screw extruder TEX30 manufactured by Nippon Steel Works (L / D = 45.
5). 100 parts by weight of nylon 6 resin having a relative viscosity of 2.70, 16 parts by weight of kaolin surface-treated with aminosilane having a particle size of 0.8 μm, and nylon resin 10
0.4 parts by weight of maleic anhydride is dry-blended with respect to 0 parts by weight, and the whole amount is supplied to a feeder of an extruder operating at a cylinder temperature of 260 ° C. and a screw rotation speed of 150 rpm to perform melt-kneading and extrusion. After cooling, the gut was pelletized with a pelletizer.

These were injection-molded into various test pieces and full wheel caps, and the surface smoothness, material strength, high-speed surface impact, and the like were measured by the methods described above. The results were as shown in Table 1. The adhesion amount of the polyamide resin component is (1)
, (2) and (3) were obtained and agreed within the error range.

Comparative Example 1 Kneading, pelletizing, injection molding and measurement of physical properties were carried out in exactly the same manner as described in Example 1, except that maleic anhydride was not added. The amount of polyamide resin component attached is (1)
Method, (2) method and (3) method, and all agreed within the error range. The results are as shown in Table 2, and the composition obtained here was insufficient in tensile elongation at break, impact value, and high-speed surface impact property as compared with the composition of the present invention shown in Example 1.

Examples 2 to 5, Comparative Examples 2 to 5 As shown in Tables 1 and 2, the types and amounts of the nylon resins, inorganic fillers and olefin compounds having a carboxylic anhydride group in the molecule were changed. Except for the above, melt kneading, pelletizing, injection molding, and measurement of physical properties were performed in exactly the same manner as described in Example 1, and the results shown in Tables 1 and 2 were obtained. The polyamide resin component adhered to the filler was obtained in Examples 2 to 5,
Comparative Examples 2-3 were determined by the methods (1), (2) and (3),
All matched within the error range. Comparative Examples 4 and 5 were determined by the method (2).

[0043]

[Table 1]

[0044]

[Table 2]

Even when the types of the nylon resin and the inorganic filler are different, the addition of (c) the substituted olefin compound or the polymer of the substituted olefin compound clearly shows tensile elongation, impact strength, high-speed surface impact characteristics, and surface smoothness. It can be seen that is improved. When glass fibers were used, no remarkable improvement effect was observed (Comparative Examples 4 and 5).

Example 6, Comparative Examples 6 to 7 As shown in Table 3, a polyamide resin, an inorganic filler, a polyphenylene oxide resin and maleic anhydride were blended, and melt-kneaded in the same manner as described in Example 1. Pelletization, injection molding, and measurement of physical properties were performed, and the results shown in Table 3 were obtained. The polyphenylene oxide was removed using chloroform, and the amount of nylon adhering to the filler was determined by infrared spectroscopy (method (1)) and elemental analysis (method (2)). When a large amount of polyphenylene oxide was added, the amount of adhered nylon decreased, and good characteristics could not be obtained.

[0047]

[Table 3]

[0048]

As described above, the resin composition of the present invention has both excellent rigidity and toughness, particularly excellent high-speed impact fracture characteristics, and a balanced surface appearance and dimensional stability of a molded product. It is excellent in molding by injection molding, extrusion molding, blow molding and the like, and can be suitably used for vehicle exterior parts.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 35:00)

Claims (12)

[Claims] 1. A non-fibrous inorganic filler (B) having an average particle diameter of 0.05 to 10 μm and / or a fiber diameter of 0.1% excluding glass fibers per 100 parts by weight of (A) nylon resin.
A vehicle exterior obtained by melting and kneading 5 to 150 parts by weight of a fibrous inorganic filler having a particle size of 05 to 10 µm and (C) an olefin compound having a carboxylic anhydride group in a molecule or a polymer of the olefin compound. Resin composition for parts. 2. The method according to claim 1, wherein (C) an olefin compound having a carboxylic anhydride group in the molecule or a polymer of the olefin compound is used in an amount of from 0.05 to 100 parts by weight of the nylon resin (A).
The resin composition for vehicle exterior parts according to claim 1, wherein 10 parts by weight are melt-kneaded. 3. The resin composition for vehicle exterior parts according to claim 1, wherein the nylon resin is at least one selected from aliphatic nylon resins having a melting point of 200 ° C. or higher. 4. The nylon resin is nylon 66 or nylon 6.
The resin composition for a vehicle exterior part according to any one of claims 1 to 3, which is at least one member selected from the group consisting of: 5. The vehicle exterior according to claim 1, wherein the olefin compound is at least one selected from maleic anhydride, itaconic anhydride, glutaconic anhydride, citraconic anhydride, and aconitic anhydride. Resin composition for parts. 6. The resin composition for vehicle exterior parts according to claim 1, wherein the polymer of the olefin compound is polymaleic anhydride. 7. An inorganic filler comprising kaolin, wollastenite,
The resin composition for vehicle exterior parts according to any one of claims 1 to 6, which is selected from talc. 8. The method according to claim 1, wherein the inorganic filler is kaolin.
The resin composition for vehicle exterior parts according to any one of the above. 9. A polyamide resin component adhering to an inorganic filler when the resin composition for vehicle exterior parts is dissolved in hexafluoroisopropanol and the inorganic filler is recovered is 4 g per unit surface area of the inorganic filler measured by a BET method. / M < ² > or more, The resin composition for vehicle exterior parts according to any one of claims 1 to 8, characterized in that: 10. A non-fibrous inorganic filler having an average particle diameter of 0.05 to 10 μm and / or a fiber diameter of 0.1% excluding glass fibers per 100 parts by weight of (A) nylon resin.
5 to 150 parts by weight of a fibrous inorganic filler having a particle size of 05 to 10 μm and (C) an olefin compound having a carboxylic anhydride group in a molecule or a polymer of these olefin compounds is melt-kneaded, which is used for vehicle exterior parts. A method for producing a resin composition. 11. The resin composition for a vehicle exterior component according to claim 1, wherein the vehicle exterior component is a resin composition for a wheel cap. 12. A vehicle exterior part comprising the resin composition for a vehicle exterior part according to claim 1.