JP7383466B2 - thermoplastic resin composition - Google Patents

Description

The present invention relates to a resin composition.

Polypropylene resin is a low-density, inexpensive plastic with excellent chemical resistance, solvent resistance, and moldability, so it is used in automobile parts, industrial parts, electric/electronic equipment parts, household appliances, etc. has been done.
On the other hand, polyphenylene ether resin is known as an engineering plastic with excellent flame retardancy, heat resistance, dimensional stability, non-water absorption, and electrical properties, but it has poor melt flowability and poor moldability. It has the disadvantage of poor solvent resistance and impact resistance.

Many proposals have been made regarding alloys of polypropylene resins and polyphenylene ether resins in order to combine the advantages of these polypropylene resins and polyphenylene ether resins and compensate for their drawbacks.
Specifically, the technology uses a high-crystalline polypropylene resin and a medium-crystalline polypropylene-based resin together in a specific ratio (Patent Document 1), and a hydrogenated technology that has a specific structure as an admixture for a polypropylene-based resin and a polyphenylene ether-based resin. A technique using a block copolymer (Patent Document 2) has been proposed. Furthermore, when melt-kneading a polypropylene-based resin and a polyphenylene ether-based resin, a technique has been proposed (Patent Document 3) in which the polypropylene-based resin is first added to a melt of the polyphenylene ether-based resin and an admixture, and then the polypropylene-based resin is further melt-kneaded. There is.

Furthermore, a technique has been proposed to improve heat resistance and strength by adding inorganic fillers to this alloy.
Specifically, the technique involves blending a polypropylene resin, a polyphenylene ether resin, a glass fiber surface-treated with a silane compound, and a propylene polymer modified with an oxygen-containing unsaturated organic compound such as maleic anhydride (Patent Document 4). and 5) are proposed.

Japanese Patent Application Publication No. 9-12799 Japanese Patent Application Publication No. 9-12804 Japanese Patent Application Publication No. 9-302167 Japanese Patent Application Publication No. 3-14853 International Publication No. 2007/138177

Molded articles for automobile parts and industrial parts are becoming larger and more complex in design, and as a result, welds are sometimes formed when injection molding the molded articles. In general, the strength of welded parts may be lower than that of non-welded parts, and product defects due to weld cracks have sometimes been a problem.
However, it has been difficult to improve the weld strength to a high level without reducing the strength of the non-welded portion. Further, although weld strength can be improved to some extent by optimizing molding conditions, it is required to obtain products with little variation from product to product during mass production.

Therefore, an object of the present invention is to provide a resin composition that has a good balance between heat resistance and toughness, has excellent strength in non-welded parts and welded parts, and can yield molded products with less variation in strength in welded parts. .

In order to solve the above problems, the present inventors have conducted extensive research and found that a polyphenylene ether tree, a specific polypropylene resin, a specific amount of modified polypropylene resin having a specific configuration, an admixture, and By creating a resin composition containing a specific amount of inorganic filler, it is possible to obtain a molded product with excellent balance between heat resistance and toughness, and strength in non-welded and welded areas, with less variation in strength in welded areas. This discovery led to the completion of the present invention.

That is, the present invention is as follows.
[1]
(A) polyphenylene ether resin,
(B) polypropylene resin,
(C) modified polypropylene resin,
(D) an admixture, and (E) an inorganic filler;
The melting point of the component (B) is 158° C. or higher, and the solidifying point is 113° C. or higher,
The component (C) is (c-1) a propylene unit, (c-2) an ethylene unit, and (c-3) a unit derived from an α,β-unsaturated carboxylic acid or a derivative thereof, a unit containing a glycidyl group, or one or more units selected from units containing an oxazoline group,
In the component (C), the content of the (c-1) unit is 90 to 98 mol%, when the total of all structural units is 100 mol%,
The component (D) is one or more selected from the group consisting of a hydrogenated block copolymer, a copolymer having a polystyrene block chain-polyolefin block chain, and a copolymer having a polyphenylene ether block chain-polyolefin block chain. can be,
The component (E) is glass fiber,
The content of the component (E) is 5 to 45% by mass based on the total amount of the resin composition,
A thermoplastic characterized in that the content of the component (C) is 1.0 to 5.0 parts by mass when the total of the component (B) and the component (C) is 100 parts by mass. Resin composition.
[2]
In the component (C), when the total of the units (c-1), (c-2), and (c-3) is 100 parts by mole, the content of the unit (c-3) is 0. The thermoplastic resin composition according to [1], which contains .001 to 0.02 parts by mole.
[3]
The thermoplastic resin composition according to [1], wherein the weight average molecular weight of the component (C) is 70,000 to 150,000.
[4]
According to [1], the content of the component (A) is 5 to 70 parts by mass when the total of the component (A), the component (B), and the component (C) is 100 parts by mass. thermoplastic resin composition.
[5]
The total content of the (B) component and the (C) component is 30 to 95 parts by mass when the total of the (A) component, the (B) component, and the (C) component is 100 parts by mass. The thermoplastic resin composition according to [1].
[6]
The thermoplastic resin composition according to [1], wherein the content of the component (D) is 1 to 20 parts by mass based on 100 parts by mass of the component (A).

According to the present invention, a resin composition can be obtained that has an excellent balance between heat resistance and toughness, has excellent strength in non-welded parts and welded parts, and can yield molded products with little variation in strength in welded parts.

Hereinafter, a mode for carrying out the present invention (hereinafter referred to as "this embodiment") will be described in detail. The present embodiment below is an illustration for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be implemented with appropriate modifications within the scope of its gist.

[Resin composition]
The resin composition of the present embodiment includes (A) a polyphenylene ether resin, (B) a polypropylene resin, (C) a modified polypropylene resin, (D) an admixture, and (E) an inorganic filler; ) component has a melting point of 158°C or higher and a solidification point of 113°C or higher, and the component (C) comprises (c-1) propylene units, (c-2) ethylene units, (c-3) α, It has one or more units selected from a unit derived from a β-unsaturated carboxylic acid or a derivative thereof, a unit containing a glycidyl group, or a unit containing an oxazoline group, and in the component (C), the total of all structural units is 100 mol%, the content of the (c-1) unit is 90 to 98 mol%, and the content of the component (E) is 5 to 45% by mass based on the total amount of the resin composition. When the total of the component (B) and the component (C) is 100 parts by mass, the content of the component (C) is 1.0 to 5.0 parts by mass.

（一般式（１）中、Ｒ₁、Ｒ₂、Ｒ₃、及びＲ₄は、それぞれ独立して、水素原子、ハロゲン原子、炭素数１～７の第１級又は第２級のアルキル基、フェニル基、ハロアルキル基、アミノアルキル基、炭化水素オキシ基、又は少なくとも２個の炭素原子がハロゲン原子と酸素原子とを隔てているハロ炭化水素オキシ基を表す。） -(A) Polyphenylene ether resin-
The resin composition of the present embodiment contains at least (A) a polyphenylene ether (PPE)-based resin (hereinafter sometimes simply referred to as "component (A)").
Component (A) is a resin component containing polyphenylene ether (PPE), and PPE includes, but is not limited to, a homopolymer having a repeating unit structure represented by the following general formula (1). and/or copolymers; or modified products thereof.

(In general formula (1), R ₁ , R ₂ , R ₃ , and R ₄ are each independently a hydrogen atom, a halogen atom, a primary or secondary alkyl group having 1 to 7 carbon atoms, represents a phenyl group, a haloalkyl group, an aminoalkyl group, a hydrocarbonoxy group, or a halohydrocarbonoxy group in which at least two carbon atoms separate the halogen atom and the oxygen atom)

The reduced viscosity of component (A) (0.5 g/dL chloroform solution, measured at 30°C) is not particularly limited, but is preferably 0.15 to 0.7 dL/g, and 0.2 to 0.6 dL. /g is more preferable.
When the reduced viscosity of component (A) is within the above range, excellent impact resistance and heat resistance can be obtained in the resin composition of this embodiment. The reduced viscosity of component (A) can be adjusted by adjusting the production conditions such as the amount of catalyst during polymerization and the polymerization time.
Component (A) may be a mixture of two or more polyphenylene ether resins having different reduced viscosities.

Component (A) is not particularly limited, and known components may be used. For example, poly(2,6-dimethyl-1,4-phenylene ether), poly(2-methyl-6-ethyl-1,4-phenylene ether), poly(2-methyl-6-phenyl-1,4- homopolymers such as 2,6-dimethylphenol and other phenols (such as 2,3,6-trimethylphenol and 2- copolymers with methyl-6-butylphenol); and the like. Among these, poly(2,6-dimethyl-1,4-phenylene ether), a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol are preferred; , 4-phenylene ether) is more preferred.
Component (A) may be used alone or in combination of two or more.

The method for producing component (A) is not particularly limited, and conventionally known methods can be used. For example, a complex of a cuprous salt and an amine described in U.S. Pat. , Method of oxidative polymerization of 2,6-xylenol, US Pat. No. 3,306,875, US Pat. No. 3,257,357, US Pat. Examples include the methods described in Japanese Patent Application Laid-Open No. 152628/1983.

Component (A) may be the above-mentioned unmodified PPE modified with a modifier such as a styrene monomer or a derivative thereof (modified PPE). In this case, for example, unmodified PPE may be grafted or added with a styrene monomer or a derivative thereof. Modified PPE can be produced by, for example, reacting the above-mentioned PPE with a styrenic monomer or its derivative at 80 to 350°C in the presence or absence of a radical generator in a molten state, a solution state, or a slurry state. can get.

Examples of the modifier for PPE include styrene monomers, α,β-unsaturated carboxylic acids, and derivatives thereof (eg, ester compounds, acid anhydride compounds, etc.). Examples of the styrene monomer include styrene, α-methylstyrene, styrene sulfonic acid, and the like.
Specific examples of the above-mentioned modified PPE include modified PPE to which a styrene monomer or a derivative thereof is grafted or added in a proportion of 0.01 to 10% by mass.

Component (A) may include both unmodified PPE and modified PPE. The mixing ratio of unmodified PPE and modified PPE is not particularly limited, and can be mixed at any ratio.

In this embodiment, component (A) may contain one or more selected from the group consisting of polystyrene, syndiotactic polystyrene, and high impact polystyrene. In particular, it is preferable to mix one or more selected from the group consisting of polystyrene, syndiotactic polystyrene, and high-impact polystyrene in a total amount not exceeding 400 parts by mass with respect to 100 parts by mass of the above-mentioned PPE. be.

-(B) Polypropylene resin-
The resin composition of the present embodiment preferably contains at least (B) a polypropylene resin (hereinafter sometimes simply referred to as "component (B)").
Examples of the component (B) include propylene homopolymers, copolymers of propylene and other monomers, and modified products thereof. Component (B) is preferably crystalline, more preferably a crystalline propylene homopolymer or a crystalline propylene-ethylene block copolymer. Furthermore, component (B) may be a mixture of a crystalline propylene homopolymer and a crystalline propylene-ethylene block copolymer.
Component (B) may be used alone or in combination of two or more.

Other monomers copolymerizable with propylene include, for example, α-olefins such as butene-1 and hexene-1. The polymerization form is not particularly limited, and may be a random copolymer, a block copolymer, or the like.

As a method for producing the crystalline propylene-ethylene block copolymer, for example, a crystalline propylene homopolymer portion is synthesized in the first step of polymerization, and propylene, ethylene, and if necessary, are synthesized in the second and subsequent steps of polymerization. Examples include a method in which another α-olefin used in combination is copolymerized with a crystalline propylene homopolymer portion.

The method for producing component (B) is not particularly limited, and known methods such as a method of polymerizing propylene or other monomers in the presence of a catalyst can be used. Specifically, for example, a method of polymerizing propylene or other monomers in the presence of the above-mentioned catalyst and an alkyl aluminum compound at a polymerization temperature of 0 to 100° C. and a polymerization pressure of 3 to 100 atm.
Examples of the catalyst used in the production of component (B) include titanium trichloride catalysts and titanium halide catalysts supported on carriers such as magnesium chloride. In the production of component (B), a chain transfer agent such as hydrogen may be added in order to adjust the molecular weight of the polymer.

As the polymerization method for producing component (B), either a batch method or a continuous method can be selected. The polymerization method is selected from solution polymerization in a solvent such as butane, pentane, hexane, heptane, octane, etc., slurry polymerization, bulk polymerization in a monomer without a solvent, gas phase polymerization in a gaseous monomer, etc. can.

In the production of component (B), in addition to the above catalyst, an electron-donating compound can be used as a third component as an internal donor component or an external donor component in order to enhance the isotacticity and polymerization activity of polypropylene. As the electron-donating compound, known compounds can be used, such as ester compounds such as ε-caprolactone, methyl methacrylate, ethyl benzoate, methyl toluate, aromatic monocarboxylic acid ester, alkoxy ester; phosphorous acid Phosphite esters such as triphenyl and tributyl phosphite; Phosphoric acid derivatives such as hexamethylphosphoric triamide; Alkoxysilanes such as aromatic alkyl alkoxysilanes and aliphatic hydrocarbon alkoxysilanes; various ethers; various alcohols ; various phenols; and the like.

The melt flow rate (MFR) of component (B) (230°C, load 2.16 kgf) is preferably 0.01 to 300 g/10 minutes, more preferably 0.1 to 100 g/10 minutes. , more preferably 0.1 to 30 g/10 minutes. By setting the MFR within the above range, molding fluidity, impact strength, and weld strength can be balanced.
Further, as long as the polypropylene resin has an MFR within these ranges, it may be used alone or in combination of two or more.

The melting point of component (B) is 158°C or higher, preferably 160°C or higher, more preferably 165°C or higher, and even more preferably 167°C or higher. By setting the melting point of component (B) within the above numerical range, the rigidity and heat-resistant creep characteristics after heat history (for example, after heat history at 80° C. for 24 hours) can be further improved.

The solidification point of component (B) is 113°C or higher, preferably 115°C or higher, more preferably 117°C. By setting the solidification point of component (B) within the above numerical range, the rigidity and heat-resistant creep properties after heat history (for example, after heat history at 80° C. for 24 hours) can be further improved.

The melting point and solidification point of component (B) were determined using a differential scanning calorimeter (DSC) (manufactured by PerkinElmer, trade name "DSC-2 type") at a heating rate of 20°C/min and a cooling rate of 20°C/min. It can be determined by measuring under the conditions of 10 minutes. Specifically, first, about 5 mg of the sample is held at 20°C for 2 minutes, then the temperature is raised to 230°C at a heating rate of 20°C/min, and held at 230°C for 2 minutes. Then, the temperature is lowered to 20°C at a cooling rate of 20°C/min, and held at 20°C for 2 minutes. The temperature at the top of the exothermic peak that appears when the temperature is lowered can be determined as the solidification point.
Further, the temperature is raised to 230°C at a heating rate of 20°C/min, and held at 230°C for 2 minutes. The temperature at the top of the endothermic peak that appears when the temperature is raised can be determined as the melting point.

-(C) Modified polypropylene resin-
The resin composition of the present embodiment contains at least (C) a modified polypropylene resin (hereinafter sometimes simply referred to as "component (C)"). By containing the modified polypropylene resin (C), the adhesion between the resin composition and the inorganic filler (E) can be improved, and mechanical strength can be improved.

Component (C) of this embodiment includes (c-1) a propylene unit, (c-2) an ethylene unit, and (c-3) a unit containing an α,β-unsaturated carboxylic acid or a derivative thereof, a glycidyl group. or one or more units selected from a unit containing an oxazoline group.

Examples of α,β-unsaturated carboxylic acids and their derivatives include maleic acid, maleic anhydride, fumaric acid, citraconic acid, citraconic anhydride, mesaconic acid, itaconic acid, itaconic anhydride, aconitic acid, aconitic anhydride, Himic anhydride. Examples include acids, (meth)acrylic acid, (meth)acrylic esters, and the like. Among these, maleic anhydride is preferred.

Examples of the monomer constituting the unit containing a glycidyl group include unsaturated carboxylic acid glycidyl ether, glycidyl acrylate, glycidyl methacrylate, and the like.

Examples of the monomer constituting the unit containing an oxazoline group include oxazoline and oxazole, with oxazoline being preferred.
Oxazoline is a heterocyclic compound represented by the following chemical formula (2), and refers to a group of compounds containing this heterocycle.

(C) The modified polypropylene resin may be obtained by modifying an unmodified polypropylene resin with a modifier such as an α,β-unsaturated carboxylic acid or a derivative thereof (including acid anhydrides and esters). Examples of modified polypropylene resins include those obtained by grafting and adding α,β-unsaturated carboxylic acids or derivatives thereof to unmodified polypropylene resins.
Specific examples include those in which α,β-unsaturated carboxylic acid or its derivative is grafted or added to polypropylene resin at a ratio of about 0.01 to 10% by mass of the entire polypropylene resin. .
(C) The modified polypropylene resin can be mixed with the unmodified polypropylene resin described above in a molten state, a solution state, or a slurry state at a temperature of 30 to 350°C in the presence or absence of a radical generator. It is obtained by reacting with the agent.

(C) There are no particular restrictions on the method for producing the modified polypropylene resin, but examples include a method in which a polypropylene resin is reacted in a state dissolved in an organic solvent, a method in which a polypropylene resin is reacted in a state in which it is dissolved, a method in which a polypropylene resin is reacted in a state in which it is dissolved. Examples include a method in which the reaction is carried out in a slurry state with a solvent, a method in which a polypropylene resin powder is reacted in a gas phase state, and the like.

In this embodiment, the weight average molecular weight of component (C) is preferably 70,000 to 150,000, more preferably 70,000 to 110,000, and even more preferably 70,000 to 100,000. When it is within this range, a molded product can be obtained that has excellent heat resistance, toughness, and strength in the non-welded portion and the welded portion, and has less variation in the strength of the welded portion.

In this embodiment, when the total of all structural units of component (C) is 100 mol%, the content of units (c-1) is 90 to 98 mol%, preferably 92 to 98 mol%. , more preferably 94 to 98 mol%. When the content of the (c-1) unit is within this range, a molded product with excellent heat resistance, toughness, and strength in non-welded and welded parts and with little variation in strength in the welded part can be obtained.

In this embodiment, when the total of (c-1) units, (c-2) units, and (c-3) units is 100 mol parts, the content of (c-2) units is 2 to 10 mol parts. 1 part, more preferably 2 to 8 parts by mole, and even more preferably 4 to 6 parts by mole. When the content of the (c-2) unit is within this range, a molded product can be obtained that has excellent heat resistance, toughness, and strength in non-welded parts and welded parts, and has little variation in strength in welded parts.
Furthermore, when the total of (c-1) units, (c-2) units, and (c-3) units is 100 mole parts, the content of (c-3) units is 0.001 to 0.02 It is preferably a molar part, more preferably 0.003 to 0.02 molar part, even more preferably 0.005 to 0.02 molar part. When it is within this range, a molded product can be obtained that has excellent heat resistance, toughness, and strength in the non-welded portion and the welded portion, and has less variation in the strength of the welded portion.
In this embodiment, when the total of all constitutional units of component (C) is 100 mol%, the total content of (c-1) units, (c-2) units, and (c-3) units is as follows: It is preferably 99 to 100 mol%, more preferably 99.5 to 100 mol%, particularly preferably 100 mol%.

In this embodiment, when the total of (B) polypropylene resin and (C) modified polypropylene resin is 100 parts by mass, the content of component (C) is 1.0 to 5.0 parts by mass. , preferably 1.0 to 4.0 parts by weight, more preferably 1.0 to 3.5 parts by weight, even more preferably 1.0 to 3.0 parts by weight. When the content of component (C) is within this range, a molded product can be obtained that has excellent heat resistance, toughness, and strength in the non-welded portion and the welded portion, and has less variation in the strength of the welded portion.

-(D) Admixture-
The resin composition of the present embodiment contains at least (D) an admixture (hereinafter sometimes simply referred to as "component (D)"). By containing the admixture (D), the compatibility between the components (A) and (B) can be improved.

By containing the (D) component, the resin composition of the present embodiment can form a matrix phase containing the (B) component and a dispersed phase containing the (A) component. Thereby, the heat-resistant creep properties of the resulting resin composition can be further improved. The morphology of the resin composition can be confirmed by, for example, a transmission electron microscope.

The matrix phase is preferably composed of a component containing at least component (B), and may be composed of a component containing component (B) and component (C), for example. The dispersed phase is preferably composed of a component containing at least component (A), and may be composed of a component containing component (A) and component (D), for example. Component (D) is not only included in the dispersed phase, but may also be partially included in the matrix phase to the extent that the effects of the present invention are not impaired.

Component (D) is preferably a copolymer having a segment block chain having high compatibility with component (A) and a segment block chain having high compatibility with component (B). High compatibility means that there is no phase separation.

Examples of the segment block chain having high compatibility with component (A) include polystyrene block chains, polyphenylene ether block chains, and the like.
Examples of the segment block chain having high compatibility with component (B) include a polyolefin block chain, a copolymer elastomer block chain of ethylene and α-olefin, and the like.
Note that in this specification, component (D) is not included in the scope of component (A) and component (B).

As component (D), for example, one selected from the group consisting of a hydrogenated block copolymer, a copolymer having a polystyrene block chain-polyolefin block chain, and a copolymer having a polyphenylene ether block chain-polyolefin block chain. There are more than one species. Among these, hydrogenated block copolymers are preferred from the viewpoint of superior thermal stability. Component (D) may be used alone or in combination of two or more.

The above-mentioned hydrogenated block copolymer includes a block copolymer containing a polymer block a mainly composed of a vinyl aromatic compound and a polymer block b mainly composed of a conjugated diene compound, in which at least a part of the block copolymer is hydrogenated. Examples include hydrogenated block copolymers and the like.

A preferred specific example of the hydrogenated block copolymer includes a polymer block a mainly composed of a vinyl aromatic compound, and a total amount of 1,2-vinyl bonds and 3,4-vinyl bonds of 30 to 90%. A hydrogenated block copolymer containing a polymer block b1 mainly composed of a certain conjugated diene compound is preferable. The total amount of 1,2-vinyl bonds and 3,4-vinyl bonds of the conjugated diene compound in the polymer block b1 is preferably 30 to 90% from the viewpoint of compatibility with the polyphenylene ether resin.

The polymer block a is preferably a homopolymer block of a vinyl aromatic compound or a copolymer block of a vinyl aromatic compound and a conjugated diene compound.
In the polymer block a, "mainly consisting of a vinyl aromatic compound" means that the polymer block a contains more than 50% by mass of vinyl aromatic compound units. From the viewpoint of further excellent molding fluidity, impact resistance, welding, and appearance, it is preferable that the polymer block a contains 70% by mass or more of vinyl aromatic compound units.

Examples of the vinyl aromatic compound constituting the polymer block a include styrene, α-methylstyrene, vinyltoluene, p-tert-butylstyrene, and diphenylethylene. Among them, styrene is preferred.
These may be used alone or in combination of two or more.

The number average molecular weight of the polymer block a is not particularly limited, but is preferably 15,000 or more. Moreover, it is preferable that it is 50,000 or less. By setting the number average molecular weight of the polymer block a within the above range, the heat resistant creep property of the resin composition of this embodiment can be made even more excellent.
The number average molecular weight of polymer block a can be measured by GPC (mobile phase: chloroform, standard substance: polystyrene).

The polymer block b is preferably a homopolymer block of a conjugated diene compound or a random copolymer block of a conjugated diene compound and a vinyl aromatic compound.
In the polymer block b, "containing a conjugated diene compound as a main component" means that the polymer block b contains more than 50% by mass of conjugated diene compound units. From the viewpoint of further excellent molding fluidity, impact resistance, welding, and appearance, it is preferable that the polymer block b contains 70% by mass or more of conjugated diene compound units.

Examples of the conjugated diene compound constituting the polymer block b include butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene, and the like. Among them, butadiene, isoprene, and combinations thereof are preferred.
These may be used alone or in combination of two or more.

Regarding the microstructure of polymer block b (bonding form of conjugated diene compounds), the amount of 1,2-vinyl bonds and the amount of 3,4-vinyl bonds relative to the total amount of vinyl bonds contained in the conjugated diene compounds constituting the polymer block The total amount of bonding (hereinafter sometimes referred to as "total vinyl bonding amount") is preferably 30 to 90%, more preferably 45 to 90%, and 65 to 90%. is even more preferable.
By setting the total vinyl bond content of the conjugated diene compound in the polymer block b within the above range, the compatibility with the polypropylene resin is further improved. In particular, by setting the total amount of vinyl bonds to 30% or more, the dispersibility of component (A) in the resin composition can be further improved. By controlling the total amount of vinyl bonds to 90% or less, the excellent dispersibility of component (A) can be maintained while being economically efficient.
In particular, when the polymer block b is a polymer block containing butadiene as a main component, it is preferable that the total vinyl bond content of butadiene in the polymer block b is 65 to 90%.
The total amount of vinyl bonds can be measured by infrared spectrophotometer. The calculation method is based on Analytical Chemistry, Volume 21, No. 8, August 1949.

Component (D) is preferably a hydrogenated block copolymer of a block copolymer containing at least a polymer block a and a polymer block b.

When polymer block a in component (D) is represented by "a" and polymer block b is represented by "b", component (D) is, for example, a-b, a-ba, b-a-b. Examples include hydrogenated products of vinyl aromatic compound-conjugated diene compound block copolymers having structures such as -a, (ab-) ₄ Si, a-ba-ba-ba, etc. (ab-) ₄ Si in Si is a reactive residue of a polyfunctional coupling agent such as silicon tetrachloride or tin tetrachloride, or a residue of an initiator such as a polyfunctional organolithium compound. .

The molecular structure of the block copolymer containing polymer block a and polymer block b is not particularly limited, and may be, for example, linear, branched, radial, or any combination thereof. .

Polymer block a and polymer block b are characterized in that the distribution of the vinyl aromatic compound or conjugated diene compound in the molecular chain in each polymer block is random or tapered (the monomer component increases or decreases along the molecular chain). It may be partially block-shaped, or any combination thereof.

When there are two or more of either polymer block a or polymer block b in a repeating unit, those two or more polymer blocks may have the same structure or different structures. good.

The hydrogenated block copolymer of component (D) has a structure derived from the vinyl aromatic compound contained in the block copolymer before hydrogenation, from the viewpoint of better molding fluidity, impact resistance, welding, and appearance. The unit is preferably 20 to 95% by mass, more preferably 30 to 80% by mass. The content of the structural unit derived from the vinyl aromatic compound can be measured by an ultraviolet spectrophotometer.

The number average molecular weight of the block copolymer before hydrogenation is preferably 5,000 to 1,000,000, more preferably 10,000 to 800,000, and more preferably 30,000 to 500,000. It is more preferable that The number average molecular weight can be measured by gel permeation chromatography (GPC, mobile phase: chloroform, standard substance: polystyrene).

The molecular weight distribution of the block copolymer before hydrogenation is preferably 10 or less. The molecular weight distribution can be calculated by determining the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) (Mw/Mn), measured by GPC (GPC, mobile phase: chloroform, standard material: polystyrene). .

The hydrogenation rate of double bonds derived from the conjugated diene compound in component (D) is not particularly limited, but from the viewpoint of better heat resistance, it is preferably 50% or more, and preferably 80% or more. More preferably, it is 90% or more. The hydrogenation rate can be measured by NMR.

The method for producing the hydrogenated block copolymer of component (D) is not particularly limited, and any known production method may be employed. For example, JP-A-47-011486, JP-A-49-066743, JP-A-50-075651, JP-A-54-126255, JP-A-56-010542, JP-A-Sho. 56-062847, JP 56-100840, JP 02-300218, British Patent No. 1130770, US Patent No. 3281383, US Patent No. 3639517, British Patent No. Examples include manufacturing methods described in US Pat. No. 1,020,720, US Pat. No. 3,333,024, and US Pat. No. 4,501,857.

The hydrogenated block copolymer of component (D) is obtained by grafting or adding the above hydrogenated block copolymer with an α,β-unsaturated carboxylic acid or a derivative thereof (ester compound or acid anhydride compound). , or a modified hydrogenated block copolymer.

The modified hydrogenated block copolymer is prepared by combining the hydrogenated block copolymer described above with α, It can be obtained by reacting with β-unsaturated carboxylic acid or its derivative. In this case, it is preferable that α,β-unsaturated carboxylic acid or its derivative is grafted or added to the hydrogenated block copolymer in a proportion of 0.01 to 10% by mass. Furthermore, it may be a mixture of the above hydrogenated block copolymer and a modified hydrogenated block copolymer in any proportion.

-(E) Inorganic filler-
The resin composition of the present embodiment contains at least (E) an inorganic filler (hereinafter sometimes simply referred to as "component (E)"). (E) By containing an inorganic filler, mechanical strength and rigidity under heat can be improved.

Examples of inorganic fillers include glass fiber, glass flakes, wollastonite, talc, mica, kaolin, xonotlite, titanium oxide, potassium titanate, calcium carbonate, zinc oxide, and the like. Among them, glass fiber, glass flakes, wollastonite, talc, mica, titanium oxide, and zinc oxide are preferable, and glass fiber, glass flakes, and talc are more preferable, and most preferable because they have a high effect of suppressing a decrease in heat resistance. An inorganic filler that can be used is glass fiber.

As the glass fibers that can be suitably used in this embodiment, chopped strands having a fiber diameter of 5 μm to 20 μm are preferred from the viewpoint of mechanical properties and handleability. A more preferable fiber diameter is 8 μm to 15 μm.

Glass fibers and glass flakes may be surface-treated with a coupling agent (for example, silane-based, titanate-based, aluminum-based, zirconium-based, etc.). Further, a sizing agent may be applied, and epoxy-based, urethane-based, urethane/maleic acid-modified, and urethane/amine-modified compounds are preferably used. These surface treatment agents and sizing agents may be used in combination.

Wollastonite is a refined, crushed, and classified natural mineral containing calcium silicate. In addition, those synthesized artificially can also be used.
The size of wollastonite that can be suitably used in this embodiment is preferably one with an average particle size of 2 to 9 μm and an aspect ratio of 5 or more, more preferably one with an average particle size of 3 to 7 μm and an aspect ratio of 5 or more. More preferably, the average particle diameter is 3 to 7 μm and the aspect ratio is 8 or more and 30 or less.

Talc is a mineral containing magnesium hydroxide and silicate, and its chemical name is hydrated magnesium silicate. Generally, the main components of the talc are about 60% SiO ₂ , about 30% MgO, and 4.8% water of crystallization.

The average particle diameter (D50) of talc that can be suitably used in this embodiment measured by a laser diffraction method is preferably 5 μm or less, and 4 μm or less, from the viewpoint of improving the low-temperature impact properties of the resin composition. is more preferable, and even more preferably 3 μm or less.

From the viewpoint of increasing the rigidity of the resin composition, the bulk specific gravity of the talc is preferably 0.40 g/cm ³ or more, more preferably 0.50 g/cm ³ or more, and 0.60 g/cm ³ It is more preferable that it is above, and it is more preferable that it is 1.00 g/cm ³ or less.
Note that the bulk specific gravity of talc can be measured in accordance with JIS K 5101.

These inorganic fillers (E) include derivatives such as higher fatty acids or their esters and salts (e.g., stearic acid, oleic acid, palmitic acid, magnesium stearate, calcium stearate, aluminum stearate, stearic acid) as surface treatment agents. amide, stearic acid ethyl ester, etc.) and coupling agents (for example, silane-based, titanate-based, aluminum-based, zirconium-based, etc.) can be used as necessary. The amount used is preferably 0.05 to 5% by mass based on the inorganic filler.

-Other ingredients-
The resin composition of this embodiment may contain other components such as various additives, if necessary.
The above additives include, but are not limited to, polyamides, polyesters, other thermoplastic resins such as polyolefins other than component (B), plasticizers (low molecular weight polyolefins other than component (B), Organic heat stabilizers such as polyethylene glycol, fatty acid ester amides, etc.), antistatic agents, nucleating agents, fluidity improvers, reinforcing agents, various peroxides, spreading agents, and hindered phenolic antioxidants. agents, antioxidants, ultraviolet absorbers, light stabilizers, flame retardants, colorants and the like.
The content of the additive is preferably 10% by mass or less, more preferably less than 5% by mass, and even more preferably 3% by mass or less, based on the total amount of the resin composition.

-Content of each component-
The resin composition of this embodiment is composed of components (A) to (E) as basic components.
The content of component (A) contained in the resin composition of the present embodiment is 5 to 70 parts by mass when the total of component (A), component (B), and component (C) is 100 parts by mass. The amount is preferably 5 to 50 parts by mass, and more preferably 5 to 50 parts by mass. When the content of component (A) is within this range, the balance between heat resistance, heat-resistant creep properties, dimensional stability, and moldability will be even better.

The total content of component (B) and component (C) contained in the resin composition of this embodiment is based on the total of component (A), component (B), and component (C) being 100 parts by mass. In this case, the amount is preferably 30 to 95 parts by weight, more preferably 50 to 95 parts by weight. When the total content of components (B) and (C) is within this range, the balance between heat resistance, heat-resistant creep properties, dimensional stability, and moldability will be even better.

The total content of component (A), component (B), and component (C) contained in the resin composition of this embodiment is 94 to 40% by mass based on the total amount of the resin composition. is preferably 91 to 41% by mass. When the total content of components (A), (B), and (C) is within this range, the balance between heat resistance, heat-resistant creep properties, dimensional stability, and moldability is even better.

The content of component (D) contained in the resin composition of the present embodiment is preferably 1 to 20 parts by mass, and preferably 1 to 15 parts by mass, based on 100 parts by mass of component (A). is more preferable. When the content of component (D) is within the above range, the balance between heat resistant creep properties and impact resistance is excellent.

The content of the inorganic filler (E) is 5 to 45% by mass, preferably 8 to 45% by mass, and more preferably 10 to 45% by mass, based on the total amount of the resin composition. . (E) When the content of the inorganic filler is within the above range, a molded article with excellent mechanical strength and a small coefficient of linear expansion due to temperature change (for example, change from -30° C. to 120° C.) can be obtained.

[Manufacture of resin composition]
The method for producing the resin composition of the present embodiment is not particularly limited, and examples thereof include methods for producing the resin composition using various melt kneaders, kneading extruders, and the like.

The melt kneader and kneading extruder are not particularly limited, and any known kneader can be used. Examples include multi-screw extruders such as a single-screw extruder and twin-screw extruder, and heating melt kneading machines such as rolls, kneaders, Brabender plastographs, and Banbury mixers. Among these, a twin-screw extruder is preferred. Specific examples include kneading extruders such as the "ZSK" series manufactured by Coperion, the "TEM" series manufactured by Toshiba Machinery, and the "TEX" series manufactured by Japan Steel Works.

In the case of using an extruder, the type, standard, etc. thereof are not particularly limited, and any known extruder can be used as appropriate. The L/D ratio (barrel effective length (L)/barrel inner diameter (D)) of the extruder is preferably 20 to 75, more preferably 30 to 60.
As an extruder, a first raw material supply port is provided on the upstream side with respect to the flow direction of the raw materials, a first vacuum vent is provided downstream of the first material supply port, a second material supply port is provided downstream of the first vacuum vent, and a second material supply port is provided downstream of the first vacuum vent. Preferably, a die material supply port is provided, and a second vacuum vent is further provided downstream of the die material supply port. The extruder may be further provided with a third raw material supply port, a third vacuum vent, etc. downstream of these. The total number of raw material supply ports of the extruder and their arrangement can be appropriately set in consideration of the number of types of materials of the resin composition, etc.

The method of supplying raw materials to the second raw material supply port is not particularly limited, but rather than simply adding and supplying from the open ports of the second and third raw material supply ports of the extruder, a forced side feeder is used from the side open port of the extruder. The method of adding and supplying the compound is preferred because it is more stable.

The melt-kneading temperature and screw rotation speed are not particularly limited, but it is usually preferable that the melt-kneading temperature is 200 to 370° C. and the screw rotation speed is 100 to 1200 rpm.

[Molding]
The molded article of the resin composition of this embodiment can be manufactured by molding using a known molding method. The above-mentioned molding method is not particularly limited, and examples thereof include methods such as injection molding, extrusion molding, press molding, blow molding, calendar molding, and casting molding.
Specifically, the resin composition is melted in the cylinder of an injection molding machine whose cylinder temperature is adjusted within a range of not less than the melting point of component (B) and not more than 330°C, and then injected into a mold of a predetermined shape. A method for manufacturing molded products of a predetermined shape by melting a resin composition in an extruder whose cylinder temperature is adjusted within the above range, and manufacturing a fibrous molded product by spinning it from a nozzle. Examples include a method of manufacturing a film-like or sheet-like molded product by melting the resin composition in an extruder whose cylinder temperature is adjusted within the above range and extruding it from a T-die.
A coating layer made of paint, metal, other types of polymers, etc. may be formed on the surface of the molded article manufactured by the above method.

The molded product obtained from the resin composition of this embodiment can be used as a molded product with an excellent balance between heat-resistant creep properties and toughness, so it can be used as an automotive part, an electric/electronic equipment part, a household appliance, or an industrial equipment part. It can be used, and is particularly suitable for automobile exterior/skin parts, automobile interior parts, automobile underhood parts, secondary battery containers, printer ink peripheral parts, heat exchanger parts, etc. Moreover, the molded article obtained from the resin composition of this embodiment, which is also excellent in chemical resistance, moldability, heat resistance, dimensional stability, low water absorption, and electrical properties, is particularly suitable for these uses.

The present invention will be described below with reference to specific examples and comparative examples, but the present invention is not limited thereto.
The measurement methods and raw materials used in Examples and Comparative Examples are shown below.

(1) Notched Charpy impact strength Using the resin composition pellets produced in the Examples and Comparative Examples described later, the cylinder temperature was set at 230 to 250°C using an injection molding machine (manufactured by Toshiba Machinery Co., Ltd.: EC75SXII). The mold temperature was set at 70°C, and a JIS K7139 type A multipurpose test piece was molded. Using a gear oven, the multipurpose test piece was left standing in an environment of 80° C. for 24 hours to perform heat history treatment. A test piece was further cut out from the multipurpose test piece after the heat history treatment, and its Charpy impact strength was measured under a temperature condition of 23° C. according to ISO179.
Five test pieces were molded and one measurement was performed for each test piece, and the average value was taken as the notched Charpy impact strength (kJ/m ² ). It was determined that the higher this value, the better the impact resistance.

(2) Deflection temperature under load A test piece of 80 mm x 10 mm x 4 mm was further cut out from the multipurpose test piece prepared in the same manner as in (1) above, and the deflection temperature under load was measured using the flatwise method at a load of 1.8 MPa according to ISO75. (℃) was measured. It was determined that the higher the measured value, the better the heat resistance.

(3) Tensile Strength Using a multi-purpose test piece prepared in the same manner as in (1) above, a tensile test was conducted at a tensile speed of 5 mm/sec in accordance with ISO 527, and the tensile strength (MPa) was evaluated. It was determined that the higher the measured value, the better the tensile strength.

(4) Tensile weld strength and its variation Using the resin composition pellets produced with an extruder in the Examples and Comparative Examples described later, the cylinder temperature was set to 230 to Setting the mold temperature to 250°C and 70°C, pour the molten resin from both longitudinal ends of the double-end gate mold with a length of 127 mm, a width of 12.7 mm, and a thickness of 1.6 mm. Five test pieces each having a weld formed thereon were obtained. The series of operations from pellet production to injection molding using the extruder described above was repeated three times to obtain a total of 15 test pieces.
Each test piece was measured once, and a tensile test was performed in accordance with ASTM D638, except that the distance between the chucks was 50 mm and the tensile speed was 5 mm/min, and the tensile strength (MPa) was measured 15 times. The average of the measured values was calculated. It was determined that the higher this value, the better the tensile strength.
In addition, the standard deviation of the tensile strength measurements made 15 times was taken and used as the variation in tensile weld strength. It was determined that the smaller this value, the less variation.

[Raw materials used in Examples and Comparative Examples]
[(A) Polyphenylene ether resin]
Similar to Example 1 of WO 2011/105504, PPE was prepared as follows.
A 2000-liter jacketed stainless steel polymerization tank equipped with an iron sparger, stainless steel stirring turbine blades, and stainless steel baffles for introducing oxygen-containing gas at the bottom of the polymerization tank, and a reflux condenser in the vent gas line at the top of the polymerization tank. 160.8 g of cupric oxide, 1209.0 g of 47% aqueous hydrogen bromide solution, 387.36 g of di-t-butylethylenediamine, and 1875.2 g of di- -n-butylamine, 5707.2 g of butyldimethylamine, 826 kg of toluene, and 124.8 kg of 2,6-dimethylphenol were added and stirred until a homogeneous solution was obtained and the internal temperature of the reactor reached 25°C.
Next, dry air was introduced into the polymerization tank through a sparger at a rate of 1312 NL/min to start polymerization. Aeration was carried out for 142 minutes, and the internal temperature was controlled to be 40° C. at the end of polymerization. The polymerization solution at the end of the polymerization was in a solution state.
The ventilation of the dry air was stopped, and 100 kg of a 2.5% by mass aqueous solution of ethylenediaminetetraacetic acid tetrasodium salt (reagent manufactured by Dojindo Laboratories) was added to the polymerization mixture. After stirring the polymerization mixture at 70°C for 150 minutes, the mixture was allowed to stand still. The organic phase and the aqueous phase were separated by liquid-liquid separation (GEA disc centrifuge).
After the obtained organic phase was brought to room temperature, methanol was added in excess to prepare a slurry in which polyphenylene ether was precipitated. Thereafter, it was filtered using a basket centor (Model 0-15 manufactured by Tanabe Wiltec).
After filtration, excess methanol was put into the basket center and filtered again to obtain wet polyphenylene ether. Next, the wet polyphenylene ether was put into a feather mill (FM-1S manufactured by Hosokawa Micron) equipped with a 10 mm round hole mesh, and after pulverization, the wet polyphenylene ether was kept at 150°C and 1 mmHg for 1.5 hours using a conical dryer to dry it. A PPE powder was obtained. The reduced viscosity of this PPE was 0.40 dL/g (0.5 g/dL, chloroform solution, measured at 30°C).

[(B) Polypropylene resin]
(B-1)
A polypropylene resin with a number average molecular weight of 350,000, a weight average molecular weight of 710,000, a molecular weight distribution (Mw/Mn) of 2.0, a melting point of 163°C, a solidification point of 121°C, and an MFR of 2.5 g/10 minutes (230°C, 2.16 kgf).
(B-2)
A polypropylene resin with a number average molecular weight of 350,000, a weight average molecular weight of 710,000, a molecular weight distribution (Mw/Mn) of 2.0, a melting point of 162°C, a solidification point of 118°C, and an MFR of 2.5 g/10 minutes (230°C, 2.16 kgf).
[Other ingredients]
(B-x-1)
A polypropylene resin with a number average molecular weight of 350,000, a weight average molecular weight of 710,000, a molecular weight distribution (Mw/Mn) of 2.0, a melting point of 162°C, a solidification point of 111°C, and an MFR of 2.5 g/10 minutes (230°C, 2.16 kgf).
(B-x-2)
A polypropylene resin with a number average molecular weight of 300,000, a weight average molecular weight of 680,000, a molecular weight distribution (Mw/Mn) of 2.2, a melting point of 152°C, a solidification point of 119°C, and an MFR of 2.5 g/10 minutes (230°C, 2.16 kgf).

In addition, the molecular weight and molecular weight distribution were measured by gel permeation chromatography (hereinafter referred to as GPC).
<GPC conditions>
Measuring device: Gel permeation chromatograph Alliance GPC 2000 model (manufactured by Waters)
Column: TSKgel GMH6-HT (manufactured by Tosoh) x 2 + TSKgel GMH6-HTL (manufactured by Tosoh) x 2 connected in series Flow rate: 1.0 mL/min Detector: Differential refractometer (RI)
Solvent: o-dichlorobenzene Column temperature: 140°C
Sample concentration: 0.15%
Injection volume: 0.5mL
Molecular weight calibration: polystyrene conversion

[(C) Modified polypropylene resin]
(C-1)
Modified ethylene with a number average molecular weight of 40,000, a weight average molecular weight of 90,000, a molecular weight distribution (Mw/Mn) of 2.3, a content of units derived from maleic anhydride of 0.006 mol%, and a propylene/ethylene ratio of 94/6 mol%.・Propylene copolymer.
(C-2)
Modified ethylene with a number average molecular weight of 40,000, a weight average molecular weight of 90,000, a molecular weight distribution (Mw/Mn) of 2.3, a content of units derived from maleic anhydride of 0.009 mol%, and a propylene/ethylene ratio of 96/4 mol%.・Propylene copolymer.
(C-3)
Number average molecular weight 36,000, weight average molecular weight 75,000, molecular weight distribution (Mw/Mn) 1.6, content of units derived from maleic anhydride 0.004 mol%, propylene/ethylene = 96/4 mol % modified ethylene-propylene copolymer.
[Other ingredients]
(C-x-1)
Modified ethylene with a number average molecular weight of 50,000, a weight average molecular weight of 110,000, a molecular weight distribution (Mw/Mn) of 2.5, a content of units derived from maleic anhydride of 0.006 mol%, and a propylene/ethylene ratio of 85/15 mol%.・Propylene copolymer.
(C-x-2)
A modified polypropylene with a number average molecular weight of 57,000, a weight average molecular weight of 110,000, a molecular weight distribution (Mw/Mn) of 1.9, a content of units derived from maleic anhydride of 0.006 mol%, and a propylene 100 mol%.

The propylene/ethylene content was calculated using NMR, and the content of units derived from maleic anhydride was determined by measuring the acid value using the following titration method to calculate the amount of maleic anhydride.
<NMR measurement conditions>
^13C -NMR
100 mg of the sample and 0.6 mL of heavy orthodichlorobenzene were placed in an NMR sample tube and heated at 150 degrees for 8 hours to completely dissolve the sample. This was used as a sample for NMR measurement.
Measuring device: JEOL-ECA500
SCAN: 25,000 times Solvent: Heavy orthodichlorobenzene Standard: Orthodichlorobenzene (132.39ppm)
Temperature: 150℃
Mode: Quantitative mode The P/E ratio was calculated using the integrated value of CH ₂ derived from EP (ethylene-propylene) and CH ₂ derived from PP (propylene-propylene).

<Acid value measurement conditions>
The sample and xylene were heated and dissolved in an oil bath at 135° C. for about 40 minutes, and then the solution was poured into acetone and reprecipitated to remove free maleic anhydride not bonded to the polymer. The precipitate was dried with hot air at 60°C and used as a titration sample. Approximately 0.5 g of this sample and 70 ml of xylene are added to a 100 mL Erlenmeyer flask, an air cooling tube is attached, and the flask is heated and dissolved in an oil bath at 135° C. for 15 minutes. Three drops of phenolphthalein was added thereto as an indicator, and the mixture was titrated with a 0.05 mol/L sodium hydroxide benzyl alcohol solution on a hot stirrer at about 100° C., and the acid value was determined using the following formula.
Acid value (mgKOH/g) = {(V ₁ - V ₀ ) x N x f x 56.11}/S
V ₁ : Titrated liquid volume (ml) in this test
V ₀ : Volume of titrant in blank test (ml)
N: concentration of titrant (mol/L)
f: Titrant factor S: Sample mass

[(D) Admixture]
A hydrogenated block copolymer having a polystyrene-hydrogenated polybutadiene-polystyrene structure. The amount of styrene units contained in the block copolymer before hydrogenation is 43%, the amount of 1,2-vinyl bonds in the polybutadiene portion is 75%, the number average molecular weight of the polystyrene chain is 20,000, and the hydrogenation rate of the polybutadiene portion. was 99.9%.
The hydrogenated block copolymer is produced by anionic block copolymerization of styrene and butadiene in a cyclohexane solvent using n-butyllithium as an initiator and tetrahydrofuran as a 1,2-vinyl bond content regulator. A styrene-butadiene block copolymer was obtained. Next, using bis(η5-cyclopentadienyl) titanium dichloride and n-butyllithium as hydrogenation catalysts, the obtained styrene-butadiene block copolymer was heated at a hydrogen pressure of 5 kg/cm ² and a temperature of 50 Hydrogenation was carried out at ℃. The polymer structure was controlled by adjusting the amount and order of monomers. Molecular weight was controlled by adjusting the amount of catalyst. The amount of 1,2-vinyl bonds was controlled by adjusting the amount of the regulator for the amount of 1,2-vinyl bonds added and the polymerization temperature. The hydrogenation rate was controlled by adjusting the hydrogenation time.
The amount of 1,2-vinyl bonds in the polybutadiene moiety was measured using an infrared spectrophotometer, and the amount of 1,2-vinyl bonds in the polybutadiene moiety was measured using an infrared spectrophotometer. 8, August 1949. The amount of bound styrene was measured using an ultraviolet spectrophotometer.
The number average molecular weight of polystyrene chains was determined by GPC (mobile phase: chloroform, standard substance: polystyrene). The hydrogenation rate of the polybutadiene portion was measured using a nuclear magnetic resonance apparatus (NMR).

[(E) Inorganic filler]
ESC03 T-497 (manufactured by Nippon Electric Glass Co., Ltd., 13 μm diameter, 3 mm chopped glass fiber)).

[Examples 1 to 7 and Comparative Examples 1 to 5]
A twin-screw extruder [TEM58SX: manufactured by Toshiba Machine Co., Ltd., L/D=53.8] having three supply ports on the upstream side, midstream side, and downstream side was used. Assuming the total length of the extruder cylinder to be 1.0, the supply port at position L=0 from upstream is the first raw material supply port (upstream supply port), and the supply port at position L=0.4 from upstream. is the second raw material supply port (midstream supply port), the supply port at the position of L = 0.8 is the third raw material supply port (downstream supply port), and the barrel temperature of the extruder is set at 280 to 320°C, and the screw rotation speed. were melt-kneaded at 620 rpm and a discharge rate of 500 kg/hour to obtain pellets of the resin composition. The above-mentioned evaluations were performed using the obtained resin composition pellets. Details of the manufacturing method and evaluation results are shown in Table 1 below.

It was found that Examples 1 to 7 were excellent in impact strength, deflection temperature under load, tensile strength, and tensile strength of the welded portion, and there was little variation in the tensile strength of the welded portion.
On the other hand, in Comparative Example 1, the solidification point of the polypropylene resin was outside the range of the present invention, so the impact strength, deflection temperature under load, tensile strength, and weld strength were poor. Furthermore, in Comparative Example 2, the melting point of the polypropylene resin was outside the range of the present invention, so the deflection temperature under load, tensile strength, and weld strength were poor.
Comparative Example 3 used a modified polypropylene resin in which the content of component (c-1) was less than the lower limit of the present invention, resulting in poor impact strength, deflection temperature under load, tensile strength, and weld strength. .
Comparative Example 4 uses a modified polypropylene resin in which the content of component (c-1) exceeds the upper limit of the present invention, so although it has excellent impact strength, deflection temperature under load, tensile strength, and weld strength, it has poor weld strength. There was a large variation.
Comparative Example 5 did not contain component (C), and therefore had poor deflection temperature under load and weld strength.

The resin composition of the present invention is suitable for use in automobile parts, electric/electronic equipment parts, industrial parts, household electrical appliances, especially automobile exterior/outer panel parts, automobile interior parts, automobile underhood parts, secondary battery containers, and printers. It has industrial applicability as an ink peripheral component.

Claims (6)

(A) polyphenylene ether resin,
(B) polypropylene resin,
(C) modified polypropylene resin,
(D) an admixture, and (E) an inorganic filler;
The melting point of the component (B) is 158° C. or higher, and the solidifying point is 113° C. or higher,
The component (C) is (c-1) a propylene unit, (c-2) an ethylene unit, and (c-3) a unit derived from an α,β-unsaturated carboxylic acid or a derivative thereof, a unit containing a glycidyl group, or one or more units selected from units containing an oxazoline group,
In the component (C), the content of the (c-1) unit is 90 to 98 mol%, when the total of all structural units is 100 mol%,
The component (D) is one or more selected from the group consisting of a hydrogenated block copolymer, a copolymer having a polystyrene block chain-polyolefin block chain, and a copolymer having a polyphenylene ether block chain-polyolefin block chain. can be,
The component (E) is glass fiber,
The content of the component (E) is 5 to 45% by mass based on the total amount of the resin composition,
A thermoplastic characterized in that the content of the component (C) is 1.0 to 5.0 parts by mass when the total of the component (B) and the component (C) is 100 parts by mass. Resin composition. In the component (C), when the total of the units (c-1), (c-2), and (c-3) is 100 parts by mole, the content of the unit (c-3) is 0. The thermoplastic resin composition according to claim 1, wherein the amount is .001 to 0.02 mole part. The thermoplastic resin composition according to claim 1, wherein the weight average molecular weight of the component (C) is 70,000 to 150,000. According to claim 1, the content of the component (A) is 5 to 70 parts by mass when the total of the component (A), the component (B), and the component (C) is 100 parts by mass. thermoplastic resin composition. The total content of the (B) component and the (C) component is 30 to 95 parts by mass when the total of the (A) component, the (B) component, and the (C) component is 100 parts by mass. The thermoplastic resin composition according to claim 1. The thermoplastic resin composition according to claim 1, wherein the content of the component (D) is 1 to 20 parts by mass based on 100 parts by mass of the component (A).