JPH08311331A - Thermoplastic resin composition, molding material and molded article - Google Patents

Abstract

(57) [Summary] [Structure] The present invention is characterized by comprising a polyamide resin (A), a polar functional group-containing modified propylene polymer (B), and a carboxyl group-containing styrene copolymer (C). The present invention relates to a thermoplastic resin composition, a molding material and a molded product. [Effect] Since the present invention is a thermoplastic resin composition that is particularly excellent in paintability, impact resistance, high rigidity when absorbing water, and appearance, it can be applied to automobile wheel caps and the like. Suitable for many molding materials and moldings.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention provides good coating adhesion when coated with various paints, and has high rigidity, impact resistance, and
The present invention relates to a polyamide-based thermoplastic resin composition having a well-balanced appearance and the like, and a molding material suitable for an automobile wheel cover or the like using the same.

[0002]

2. Description of the Related Art In recent years, in order to reduce the weight of automobile wheel covers, the shift from metal to plastic has been progressing. Many of the plastics used are polyamide resins, and among them, alloys of polyamide and polyphenylene ether are typical. In recent years, in order to further reduce the weight of automobile parts, improve the rigidity when absorbing water, and reduce the cost, it has been attempted to switch to an alloy of polyamide and modified polyolefin.

However, although an alloy of polyamide and modified polyolefin (for example, Japanese Patent Publication No. 55-44108) is excellent in impact resistance, it has problems in coating adhesion and heat resistance. Therefore, alloys of styrene / maleimide copolymers, polyamides and modified polyolefins have been proposed (for example, JP-A-62-59647), but it is known that the balance between impact resistance and coating adhesion is not good. Further, an example in which barium stearate was added to an alloy of the polyamide, a styrene-maleimide copolymer and a modified polyolefin to improve coating adhesion (Japanese Patent Application Laid-Open No. HEI 7-18753).
No. 9476). In these conventional techniques, it is difficult to achieve excellent balance of heat resistance, rigidity, impact resistance, and coating properties, and there is a problem in terms of economy, such as requiring a special monomer.

As described above, in the prior art, no material having impact resistance, economy and coating adhesion can be found, but in recent years, in automobile wheel covers and the like, only top coating, and its coating. There is a need to provide a wheel cover material for automobiles that is superior in coating film adhesion that has never been achieved while maintaining the impact resistance of the wheel cover for automobiles such as diversification and coating with various paints.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a polyamide-based thermoplastic resin having excellent coating adhesion as a wheel cover material for automobiles and having excellent balance of high rigidity, impact resistance and appearance. Compositions, their molding materials and molded articles.

[0006]

In view of the above situation, the inventors of the present invention have conducted intensive studies on a thermoplastic resin composition for automobile wheel cover materials having excellent coating film adhesion, and as a result, a specific polyamide alloy composition has been obtained. It was found that the thermoplastic resin composition obtained by the method can solve the above-mentioned problems, and has completed the present invention.

That is, the present invention relates to (A) polyamide,
(B) Polar functional group-modified propylene polymer, and (C)
A thermoplastic resin composition comprising a carboxyl group-containing styrene copolymer, preferably 90 to 50% by weight of the component (A), 5 to 50% by weight of the component (B), and 5 to the component (C). 50% by weight, preferably (B) a modified propylene-based polymer obtained by melt-kneading polymerization of an aromatic vinyl monomer and a polar functional group-containing vinyl monomer. And a polymer, preferably a polar functional group-modified propylene-based polymer
(B) is obtained by adding 0.5% by weight or more of a polar functional group-containing vinyl monomer to a propylene-based polymer and performing a melt-kneading polymerization reaction. The epoxy group-containing vinyl monomer or the carboxyl group-containing vinyl monomer, preferably the carboxyl group-containing styrene copolymer is a copolymer of styrene and methacrylic acid or a copolymer of styrene and maleic anhydride. The present invention relates to a molding material characterized by being a united body and composed of these thermoplastic resin compositions.

(Constitution) Polyamide resin used in the present invention
Examples of (A) include polyamides obtained by ring-opening polymerization of lactams such as ε-caprolactam and ω-dodecalactam, amino acids such as 6-aminocaproic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid. Derived polyamide, ethylenediamine, tetramethylenediamine hexamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4- /
2,4,4-trimethylhexamethylenediamine, 1,
3- and 1,4-bis (aminomethyl) cyclohexane, bis (4,4′-aminocyclohexyl) methane,
Aliphatic, alicyclic and aromatic diamines such as meta and paraxylylenediamine and adipic acid, suberic acid, sebacic acid, dodecanedioic acid, 1,3- and 1,4-cyclohexanedicarboxylic acid, isophthalic acid, terephthalic acid , Polyamides derived from aliphatic, alicyclic and aromatic dicarboxylic acids such as dimer acid, and copolyamides and mixed polyamides thereof. Of these, polycaproamide (nylon 6), polyhexamethylene dipamide (nylon 66) and copolyamides thereof (nylon 6/66) are preferable, and nylon 6 is particularly preferable.

As a method for polymerizing the polyamide resin, generally known melt polymerization, solid phase polymerization and a combination of these methods can be adopted.

The degree of polymerization of the polyamide resin (A) is not particularly limited, and the relative viscosity (polymer 1 g is 98% concentrated sulfuric acid 100
Polyamide dissolved in ml and measured at 25 ° C) in the range of 2.0 to 5.0 can be arbitrarily selected according to the purpose, and two or more same polyamides with different relative viscosities can be mixed and used. Good.

Modified propylene polymer (B) of the present invention
Is preferably produced by melt-kneading a propylene polymer in combination with a polar functional group-containing vinyl monomer and preferably an aromatic vinyl monomer. The propylene-based polymer used at this time is a propylene homopolymer or a copolymer mainly composed of propylene and another olefin or an ethylenic vinyl monomer (preferably, a copolymer containing 75% by weight or more of propylene). ), And specific examples thereof include isotactic polypropylene, propylene-ethylene copolymer, propylene-butene copolymer and the like. These propylene-based polymers can also be mixed and used. Further, other polymers can be used as long as the properties of the propylene polymer are not impaired.

The melt-kneading polymerization reaction means that the above-mentioned polypropylene polymer in a molten state in a kneading device such as an extruder or a mixer is used as the specific vinyl monomer and the grafting agent or the polymerization reaction initiator. It means carrying out a polymerization reaction using a radical initiator.

The specific vinyl monomer for carrying out the melt-kneading polymerization reaction must contain a polar functional group. For example, a copolymerizable epoxy group-containing vinyl monomer,
Examples thereof include a carboxyl group-containing vinyl monomer (including acid anhydride vinyl monomer), a hydroxyl group-containing vinyl monomer, and an oxazoline group-containing vinyl monomer. Preferably,
An epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer.

Examples of the epoxy group-containing vinyl monomer include glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, and methacryl glycidyl ether, which may be used alone or in combination. Glycidyl methacrylate is particularly preferable.

The carboxyl group-containing vinyl monomer is, for example, acrylic acid, methacrylic acid, maleic anhydride, maleic acid and the like, and also includes acid anhydrides, and these are used alone or as a mixture. . Maleic anhydride is particularly preferable.

Examples of the hydroxyl group-containing vinyl monomer include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate and 2
-Hydroxybutyl methacrylate and the like can be used alone or in combination.

The vinyl monomer containing an oxazoline group includes 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-oxazoline and the like. There is.

Further, as the aromatic vinyl monomer which is preferably used in combination with the polar functional group-containing vinyl monomer, for example, styrene, methylstyrene, vinyltoluene, vinylxylene, ethylvinylbenzene, isopropylstyrene, chlorostyrene can be mentioned. , Dichlorostyrene, bromostyrene and the like, which may be used alone or in combination.

The addition amount of the polar functional group-containing vinyl monomer is preferably 10% by weight or less of the propylene polymer,
It is 0.5% by weight or more. If it exceeds 10% by weight, the amount of unreacted monomer increases, which may cause adverse effects such as tackiness and mechanical properties of the composition, which is not preferable. Further, if it is less than 0.5% by weight, the compatibility with the polyamide resin is lowered, which is not preferable.

The amount of the aromatic vinyl monomer added is preferably 50% by weight or less, more preferably 1 to 35% by weight, based on the propylene polymer. If it exceeds 50% by weight, the performance of the propylene polymer is impaired, which is not preferable. Further, the aromatic vinyl monomer not only has the effect of increasing the polarity of the modified propylene-based polymer and improving the coating property of the thermoplastic resin composition in which the polyamide resin and the modified propylene-based polymer are melt-blended. It is preferable to use the modified propylene-based polymer in combination for the purpose of preventing lowering of the molecular weight of the modified propylene polymer and improving the compatibility with the polyamide resin. In that case, the polar functional group-containing vinyl monomer is added at least in the same amount or more, preferably 1 to 5 times. When the amount is less than the same amount, when this reaction is carried out, adverse effects such as lowering the molecular weight of the propylene-based polymer may occur, which is not preferable.

The radical initiator is easily dissolved in the above-mentioned vinyl monomer due to the characteristics of the present invention, and the reaction is carried out at the melt-kneading temperature of the propylene-based polymer.
Decomposition temperature to obtain half-life of minutes 130-250 ℃
It is desirable that Specific examples include t-butyl peroctate, bis (t-butyl peroxy) trimethylcyclohexane, cyclohexanone peroxide, benzoyl peroxide, dicumyl peroxide, t-butyl perbenzoate, dimethyl di (t-
Butylperoxy) hexane, dimethyldi (t-butylperoxy) hexyne and the like can be mentioned. The amount of the organic peroxide used is preferably 0.1 to 10 parts by weight, more preferably 1 to 5 parts by weight, based on 100 parts by weight of the vinyl monomer.

As other additives, a propylene-based polymer is a radical-disintegrating polymer unlike polyethylene, so that it is preferable to add a stabilizer. However, it is necessary to consider the kind and addition amount so as not to hinder the polymerization of the aromatic vinyl monomer. For example, pentaerythrityl-tetrakis ((di-t-butyl-hydroxyphenyl) propionate), ocdecyl (di-t-butyl-hydroxyphenyl) propionate, thiobis (methyl t-butylphenol), trimethyl-tris (di-t-butyl). Hydroxybenzyl) benzene and other hindered phenol stabilizers, tetrakis (di-t-butylphenyl) biphenylene phosphite, tris (di-t-butylphenyl) phosphite and other phosphorus stabilizers, zinc stearate, barium stearate There are metal soaps such as calcium stearate, and antacid adsorbents such as magnesium oxide and hydrotalcite. The amount of the stabilizer used is preferably 0.01 to 1 part by weight, more preferably 0.05 to 0.5 part by weight, based on 100 parts by weight of the propylene polymer.

The melt-kneading polymerization reaction of the propylene-based polymer with the aromatic vinyl monomer and the polar functional group-containing vinyl monomer is carried out using a closed container such as a Banbury mixer or a continuous kneader such as an extruder. It is possible to use an extruder, and the extruder is preferable in view of industrial production such as granulation. Further, a twin-screw extruder is more preferable because it is easier to control the supply of reactants, kneading, polymerization time and the like.

The modified propylene-based polymer is produced by feeding the propylene-based polymer in the form of powder or pellets to an extruder and applying pressure thereto, preferably by heating at 130 to 250 ° C. to melt the crystalline propylene-based polymer. While the aromatic vinyl monomer and the polar functional group-containing vinyl monomer are melt-kneaded and polymerized, the strand discharged from the die is cooled and pelletized using a pelletizer.

The vinyl monomer may be mixed with the propylene-based polymer in advance and then supplied to the extruder, or may be supplied to the propylene-based polymer in a molten state by using a liquid feeder. It is more preferable to mix and impregnate the propylene-based polymer in advance.

The radical initiator may be added by dissolving it in the vinyl monomer in advance, or may be added to the mixture of the propylene polymer and the vinyl monomer by using the liquid feeder. The stabilizer is preferably mixed in advance with the propylene-based polymer by using a Henschel mixer or the like. The modified propylene polymer (B) in the present invention is obtained by the above procedure.

The carboxyl group-containing styrene copolymer (C) in the present invention preferably comprises an aromatic vinyl monomer, a carboxyl group-containing vinyl monomer and a small amount of a vinyl monomer copolymerizable therewith. It is a radical copolymer. Examples include styrene / maleic acid copolymers and styrene / methacrylic acid copolymers. The copolymerization ratio of each monomer is 9 for aromatic vinyl monomers such as styrene.
5 to 50% by weight, 5 to 50% by weight of a carboxyl group-containing vinyl monomer typified by methacrylic acid, and 0 to 20% by weight of other vinyl monomers copolymerizable therewith.
Other vinyl monomers are not particularly limited, but include, for example, vinyl cyanides such as acrylonitrile and methacrylonitrile, alkyl esters of unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and maleic acid, N-phenyl. Maleimides, such as maleimide, can be mentioned.

The carboxyl group-containing styrene copolymer can be produced by a conventionally known emulsion polymerization method, suspension polymerization method, bulk polymerization method or the like using the above-mentioned monomer mixture and a known radical initiator. . Of course, a commercially available copolymer can be used as the SMA resin or the SMAA resin. Further, a resin obtained by mixing the above resin with a resin such as a butadiene-based copolymer in a necessary amount can also be used.

The composition of the present invention is preferably 50 to 90% by weight of the above-mentioned polyamide resin (A), more preferably 6% by weight.
0 to 80% by weight, modified propylene polymer (B) 5 to 4
It is 5% by weight, more preferably 10 to 30% by weight, and the carboxyl group-containing styrene copolymer (C) is 5 to 45% by weight, more preferably 10 to 30% by weight. When the content of the modified propylene polymer (B) in the composition is less than 5% by weight, the modified propylene polymer cannot provide the effects of improving the high rigidity, low water absorption and impact resistance. On the other hand, when the carboxyl group-containing styrene copolymer (C) is less than 5% by weight, the effect of improving the coating property and the like by the carboxyl group-containing styrene copolymer cannot be obtained.

In addition to these essential components, additional components can be added to the composition of the present invention within a range that does not impair the effects of the invention. As an additional component, unmodified polypropylene or polystyrene, or ethylene propylene rubber,
Styrene / butadiene rubber and its water additives, and further maleated products thereof may be added. In that case, the addition timing may be after first mixing with the modified propylene-based polymer or at the time of mixing with the carboxyl group-containing styrene copolymer, but the addition amount of unmodified polypropylene, polystyrene, rubber, etc. is It should preferably be 100 parts by weight or less with respect to 100 parts by weight of the mixture of A), the polar functional group-modified propylene polymer (B) and the carboxyl group-containing styrene copolymer (C).

The method for producing the thermoplastic resin composition of the present invention is not particularly limited, and a commonly known method can be adopted. That is, (A) polyamide resin, (B)
After uniformly mixing the polar functional group-modified propylene-based polymer and the (C) carboxyl group-containing styrene copolymer in the form of pellets, powder, or pieces using a high-speed stirrer,
Various methods such as a method of melt-kneading with a single-screw or multi-screw extruder having a sufficient kneading ability, a method of melt-kneading with a Banbury mixer, a rubber roll machine, and the like can be adopted. Further, (A) polyamide resin and (B) polar functional group-modified propylene polymer, (A) polyamide resin and (C) carboxyl group-containing styrene copolymer, (B) polar functional group-modified propylene polymer and carboxyl A method in which the group-containing styrene copolymer (C) and the like are pre-kneaded in advance, and then the mixture is adjusted to a predetermined mixing ratio and then kneaded is also possible.
Further, the polyamide resin (A) may be mixed when the (B) polar functional group-modified propylene-based polymer is produced.

The thermoplastic resin composition of the present invention comprises (A) a polyamide resin, (B) a polar functional group-modified propylene-based polymer, and a carboxyl group-containing styrene copolymer (C), as well as an organic pigment and an inorganic pigment. , Organic dyes, inorganic dyes, antioxidants represented by hindered phenols, flame retardants,
A heat stabilizer, a lubricant, a plasticizer, an antistatic agent, a filler, a reinforcing material typified by glass fiber and the like can be added at any stage according to a conventional method.

The thermoplastic resin composition or the molding material of the present invention thus obtained is subjected to molding methods such as injection molding, extrusion molding, blow molding and the like, as well as automobile wheel covers, cowlings, spoilers, automobile outer plates, Molded articles such as outboard motor housings, home appliance housings, daily necessities, etc., which require painting can be suitably obtained.

[0034]

EXAMPLES Next, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. In the following, all parts and% are based on weight unless otherwise specified. The evaluation of coating properties and mechanical properties of the thermoplastic resin composition are as follows.

"Evaluation of coatability": Acrylic-urethane two-component paint (Retan PG60 / Hardener, manufactured by Kansai Paint Co., Ltd.) was applied to a 2 mm thick injection flat plate specimen with an applicator at a film thickness of about 40 μm. Cured and dried at 60 ° C. for 30 minutes. Then, a 1 mm square grid (10 × 10 pieces) was attached to the coating film, a cellotape peeling test was performed, and the coating property was evaluated by the remaining number of the coating film. If the number of remaining coating films is 95 or more, it is "○", if it is less than 95 and 80 or more, it is "△",
A value of less than 80 was evaluated as "x".

"Impactability evaluation": 1/4 of mass 0.5 kg
At the room temperature, drop an inch weight on a flat plate specimen with a thickness of 2 mm and measure the minimum height at which the specimen breaks. The (mass) x (minimum height at which the specimen breaks) is the impact strength, and the unit To kg / c
Notated as m. A composition having an impact strength of 10 kg · cm or more was evaluated as good as an evaluation standard.

"Rigidity evaluation": A bending elastic modulus was set to 2 in accordance with ASTM D790 by using an injection flat plate specimen having a thickness of 2 mm.
It was measured at 3 ° C. The flexural modulus of the test piece is 23
The measurement was carried out in a state of being immersed in water at 24 ° C. for 24 hours and subjected to a water absorption treatment. As an evaluation standard, 17,000k even after absorbing water
A composition having g / cm ² or more was evaluated as good.

"Appearance": The molded product was broken, and the presence or absence of layered peeling on the surface was visually judged, and those without phase peeling were evaluated as good.

Reference Example 1 ε-caprolactam was polycondensed to obtain polyamide 6 (A-1) having a relative viscosity of concentrated sulfuric acid of 2.7.

Reference Example 2 Relative Viscosity of Concentrated Sulfuric Acid 2.6
Polyamide 66 (A-2) of was obtained.

Reference Example 3 Production of Modified Propylene Polymer A 30 mm twin-screw extruder manufactured by Brabender (Germany) was set to a barrel temperature of 200 ° C. (however, a feeder section 180 ° C.) and a die temperature of 210 ° C. 930 parts of polypropylene (Hipol J340P, manufactured by Mitsui Petrochemical Co., Ltd.), 0.5 parts of Irganox 1010 (stabilizer manufactured by Ciba-Gaiki), 0.5 parts of phosphite 168 (stabilized by Ciba-Gaiki)
Part, 1 part of calcium stearate (stabilizer) are mixed,
After mixing 2.1 parts of Perhexin 25B (manufactured by NOF CORPORATION) with 50 parts of styrene and 20 parts of glycidyl methacrylate, the mixture was melt-kneaded in an extruder to carry out a graft reaction, and pelletized modified propylene-based resin (B-1 ) Got.

Reference Example 4 In the same manner as in Example 1 except that 50 parts of styrene and 20 parts of glycidyl methacrylate were used instead of 50 parts of styrene and 15 parts of maleic anhydride in the production of the modified propylene polymer of Reference Example 3. A melt-kneading graft reaction was carried out to obtain pelletized modified propylene-based resin (B-2).

Reference Example 5 200 parts of water and 80% saponification polyvinyl alcohol (suspension stabilizer) were placed in a polymerization tank.
0.3 part was charged, then 90 parts of styrene, 10 parts of methacrylic acid and 0.5 part of azoisobutyronitrile were charged, and the mixture was stirred at a high speed to obtain a suspended state. While maintaining the suspension state, polymerization was carried out at 80 ° C. for 6 hours and further at 90 ° C. for 1 hour to obtain a granular carboxyl group-containing styrene copolymer (C-1).

Reference Example 6 200 parts of water and polyvinyl alcohol having a saponification degree of 80% were added to a polymerization tank (suspension stabilizer).
0.3 part was charged, 96 parts of styrene, 4 parts of maleic anhydride and 0.5 part of azoisobutyronitrile were charged, and the mixture was stirred at a high speed to obtain a suspension. While maintaining the suspension state, polymerization was carried out at 80 ° C. for 6 hours and further at 90 ° C. for 1 hour to obtain a granular carboxyl group-containing styrene copolymer (C-2).

(Example 1) 700 parts of the polyamide resin (A-1) obtained in the reference example, modified polypropylene (B-
1) 200 parts and a carboxyl group-containing styrene copolymer
100 parts of (C-1) was blended, and this was melt-kneaded and blended at 250 ° C. and 20 rpm using a twin-screw extruder and pelletized by a pelletizer, and then injection molding machine (Toshiba IS5
0 AM) to obtain samples for coating property evaluation and physical property evaluation. Subsequently, the paintability and mechanical properties were evaluated under the above conditions. The results are shown in Tables 1 and 2.

(Comparative Example 1) A test piece was prepared in the same manner as in Example 1 except that the modified polypropylene (A-1) used in Example 1 was omitted, and the physical properties were evaluated.
The results are shown in Tables 1 and 2. There were problems in impact resistance, lightness and rigidity after the water absorption test.

(Comparative Example 2) A test piece was prepared in the same manner as in Example 1 except that the carboxyl group-containing styrene copolymer (C-2) used in Example 1 was omitted and the physical properties were evaluated. did. The results are shown in Tables 1 and 2. There was a problem in paintability.

(Comparative Example 3) Instead of the carboxyl group-containing styrene copolymer (C-2) used in Example 1, the same amount of commercially available polystyrene (DIC Styrene CR3500 manufactured by Dainippon Ink and Chemicals, Inc.) was added. A test piece was prepared in the same manner as in Example 1 to evaluate the physical properties.
The results are shown in Tables 1 and 2. There were problems in paintability and impact resistance.

Comparative Example 4 The same as Example 1 except that the modified propylene resin (B-1) used in Example 1 was blended with the same amount of commercially available polypropylene (Hipol J340, manufactured by Mitsui Petrochemical Co., Ltd.). A test piece was prepared in the same manner and its physical properties were evaluated. The results are shown in Tables 1 and 2. There were problems in paintability and impact resistance.

(Example 2) 600 parts of the polyamide resin (A-1) obtained in the reference example and modified polypropylene (B-
1) 200 parts and a carboxyl group-containing styrene copolymer
200 parts of (C-1) was blended, melt-kneaded and blended at 250 ° C. and 20 rpm using a twin-screw extruder and pelletized by a pelletizer, and then injection molding machine (Toshiba IS5
0 AM) to obtain samples for coating property evaluation and physical property evaluation. Subsequently, the paintability and mechanical properties were evaluated under the above conditions. The results are shown in Tables 1 and 2.

(Example 3) 700 parts of the polyamide resin (A-2) obtained in the reference example, modified polypropylene (B-
2) 200 parts and carboxyl group-containing styrene copolymer
100 parts of (C-2) was blended, melt-kneaded and blended at 280 ° C. and 20 rpm using a twin-screw extruder and pelletized by a pelletizer, and then injection molding machine (Toshiba IS5
0 AM) to obtain samples for coating property evaluation and physical property evaluation. Subsequently, the paintability and mechanical properties were evaluated under the above conditions. The results are shown in Tables 1 and 2.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

The present invention provides a thermoplastic resin composition comprising a polyamide resin (A), a polar functional group-containing modified propylene polymer (B) and a carboxyl group-containing styrene copolymer (C). It is possible to provide a molding material and a molding product that are often coated, such as a thermoplastic resin composition and an automobile wheel cap, which are particularly excellent in paintability, impact resistance, rigidity when absorbing water, and appearance.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C08L 23:26 25:08) (C08L 77/00 51:06 25:08)

Claims (8)

[Claims] 1. A thermoplastic resin composition comprising (A) a polyamide resin, (B) a polar functional group-modified propylene-based polymer, and a carboxyl group-containing styrene copolymer (C). 2. 90 to 50% by weight of component (A) and (B)
The thermoplastic resin composition according to claim 1, comprising 5 to 45% by weight of the component and 5 to 45% by weight of the component (C). 3. The (B) polar functional group-modified propylene-based polymer comprises a modified propylene-based polymer obtained by melt-kneading polymerization reaction of an aromatic vinyl monomer and a polar functional group-containing vinyl monomer. The thermoplastic resin composition according to claim 1, wherein: 4. A polar functional group-modified propylene polymer (B)
Is obtained by a melt-kneading polymerization reaction by adding 0.5% by weight or more of a polar functional group-containing vinyl monomer to a propylene-based polymer. Stuff. 5. The thermoplastic resin composition according to claim 3, wherein the polar functional group-containing vinyl monomer is an epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer. 6. The thermoplastic resin composition according to claim 1, wherein the carboxyl group-containing styrene copolymer is a copolymer of styrene and methacrylic acid or a copolymer of styrene and maleic anhydride. Stuff. 7. A molding material comprising the thermoplastic resin composition according to claim 1. 8. A molded product obtained by using the molding material according to claim 7.