JP7182333B1 - Resin composition and molded article - Google Patents

Abstract

An object of the present invention is to provide a technique for obtaining a molded article containing modified polyphenylene ether and inorganic substance powder and having good impact resistance and high rigidity. The present invention provides a resin composition comprising a thermoplastic resin, an inorganic powder, and a hydrogenated styrenic thermoplastic elastomer, wherein the thermoplastic resin and the The mass ratio with the inorganic powder is 10:90 to 50:50, the thermoplastic resin is made of modified polyphenylene ether, and the content of the hydrogenated styrene thermoplastic elastomer is is 5.0% by mass or more and 20.0% by mass or less. [Selection figure] None

Description

The present invention relates to resin compositions and molded articles.

From the viewpoint of reducing the environmental load, it is known to add inorganic powder (for example, calcium carbonate powder, etc.) in the production of resin products.

However, the inorganic powder can impair the impact resistance of the resin product. From the viewpoint of solving such problems, for example, Patent Document 1 proposes blending a specific elastomer component together with low-density polyethylene in a propylene resin composition filled with a large amount of inorganic powder.

Japanese Patent No. 6892185

Here, modified polyphenylene ether is known as a thermoplastic resin having good impact resistance.
However, the present inventors have found that blending an inorganic substance powder with a modified polyphenylene ether can increase the rigidity of the resulting product, but significantly impairs the impact resistance.

The present invention has been made in view of the above circumstances, and aims to provide a technique for obtaining a molded article containing modified polyphenylene ether and inorganic substance powder and having good impact resistance and high rigidity. do.

The present inventors have found that the above problems can be solved by blending a predetermined amount of a hydrogenated styrene thermoplastic elastomer in addition to the modified polyphenylene ether and the inorganic powder, and have completed the present invention. More specifically, the present invention provides:

(1) A resin composition,
The resin composition contains a thermoplastic resin, an inorganic powder, and a hydrogenated styrene thermoplastic elastomer,
The mass ratio of the thermoplastic resin and the inorganic substance powder is 10:90 to 50:50,
The thermoplastic resin is made of modified polyphenylene ether,
The content of the hydrogenated styrenic thermoplastic elastomer is 5.0% by mass or more and 20.0% by mass or less with respect to the resin composition.
Resin composition.

(2) The resin composition according to (1), wherein the modified polyphenylene ether is a polymer alloy containing polyphenylene ether and polystyrene resin.

(3) The resin according to (1), wherein the hydrogenated styrene thermoplastic elastomer has a weight average molecular weight of 10000 or more and 100000 or less and a styrene unit content of 30.0% or more and 80.0% or less by mass. Composition.

(4) The resin composition according to (1), wherein the inorganic substance powder is ground calcium carbonate powder.

(5) the ground calcium carbonate powder is ground calcium carbonate powder treated with a surface treatment agent;
The surface treatment agent is one or more selected from the group consisting of a surface treatment agent containing sulfonic acid, a surface treatment agent containing a sulfonate, and a surface treatment agent containing a phosphate ester.
The resin composition according to (4).

(6) The resin composition according to (4), wherein the heavy calcium carbonate powder has an average particle size of 0.7 μm or more and 6.0 μm or less as determined by an air permeation method according to JIS M-8511.

(7) A molded article made of the resin composition according to any one of (1) to (6).

(8) The molded article according to (7), wherein the molded article is an extrusion molded article or an injection molded article.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a technique for obtaining a molded article containing modified polyphenylene ether and inorganic powder and having good impact resistance and high rigidity.

Embodiments of the present invention will be described below, but the present invention is not limited thereto.

<Resin composition>
The resin composition of the present invention satisfies all of the following requirements.
- The resin composition contains a thermoplastic resin, an inorganic powder, and a hydrogenated styrenic thermoplastic elastomer.
- The mass ratio of the thermoplastic resin to the inorganic powder is 10:90 to 50:50.
- The thermoplastic resin is composed of modified polyphenylene ether.
- The content of the hydrogenated styrene-based thermoplastic elastomer is 5.0% by mass or more and 20.0% by mass or less with respect to the resin composition.

The resin composition of the present invention is mainly technically characterized in that a predetermined amount of modified polyphenylene ether is blended in the resin composition containing a thermoplastic resin and an inorganic substance powder.
According to the resin composition having the above structure, a molded article having high rigidity can be produced without impairing the impact resistance of the modified polyphenylene ether.

Hydrogenated styrene thermoplastic elastomers are known as impact modifiers for resins such as modified polyphenylene ethers.
However, it is surprising that the hydrogenated styrenic thermoplastic elastomer suppresses the decrease in the impact resistance of the modified polyphenylene ether-containing molded article and does not hinder the improvement in rigidity achieved by blending the inorganic powder. is.
The reason for this is not clear, but it is presumed that the addition of the hydrogenated styrene thermoplastic elastomer improves the dispersibility of the inorganic powder.

In the present invention, "impact resistance" includes the height of Charpy impact strength of a molded article obtained from the resin composition.

The impact resistance of a molded article obtained from the resin composition can be evaluated by the method shown in Examples.

In the present invention, the term "rigidity" includes resistance to dimensional change of a molded product against external bending force.

The rigidity of a molded article obtained from a resin composition can be evaluated by the method shown in Examples.

Details of the resin composition of the present invention are described below.

Hereinafter, in the present invention, "A consists of component a" means that "A" does not substantially contain components other than "component a", preferably contains no components other than "component a". Inclusive of non-inclusive.
In the present invention, "A does not substantially contain components other than component a" means that the content of components other than "component a" in "A" is preferably 0.1% by mass or less. and more preferably 0.05% by mass or less.

(1) Thermoplastic resin The thermoplastic resin in the present invention consists of modified polyphenylene ether (hereinafter also referred to as "modified PPE"). Modified PPE can be used singly or in combination of two or more.

"Modified polyphenylene ether (modified PPE)" is a polymer alloy of a polyphenylene ether (PPE)-based resin and a resin other than PPE.
Modified PPE has a sea-island structure in which polyphenylene ether resins are arranged in islands and other resins (polystyrene resins, polyester resins, polypropylene resins, etc.) are arranged in the sea.
Modified PPE is generally a resin that has good impact resistance but low stiffness and is easily deformed.

Modified PPE in the present invention is not particularly limited, and includes any conventionally known ones.
However, from the viewpoint that the effects of the present invention are readily exhibited, the modified PPE is preferably a polymer alloy containing polyphenylene ether and polystyrene resin.

The polyphenylene ether resin that constitutes the modified PPE is not particularly limited, but may be either or both of a homopolymer and a copolymer.

Examples of homopolymer polyphenylene ether resins include poly(2,6-dimethyl-1,4-phenylene ether), poly(2-methyl-6-ethyl-1,4-phenylene ether), poly(2- methyl-6-phenyl-1,4-phenylene ether), poly(2,6-dichloro-1,4-phenylene ether) and the like.

Polyphenylene ether-based resins that are copolymers include copolymers of 2,6-dimethylphenol and other phenols (copolymers of 2,6-dimethylphenol and 2,3,6-trimethylphenol , a copolymer of 2,6-dimethylphenol and 2-methyl-6-butylphenol, etc.).

The polystyrene-based resin that constitutes the modified PPE is not particularly limited, but resins having a styrene content of 50% by weight or more can be used.
Such resins include styrene polymers, atactic polystyrene, styrene-acrylonitrile copolymers, and rubber reinforcements thereof.

A commercially available product can also be used as the modified PPE. Examples of this include "Zylon (registered trademark) 200H" (manufactured by Asahi Kasei Corporation), "Iupiace (registered trademark) LN40" (manufactured by Mitsubishi Engineering-Plastics Corporation), and "Noryl (trademark) N190HF" (manufactured by SABIC). etc. These resins correspond to polymer alloys containing polyphenylene ether and polystyrene resins.

The content of the thermoplastic resin can be appropriately set from the viewpoint of moldability and the like.

The upper limit of the content of the thermoplastic resin is preferably 48% by mass or less, more preferably 43% by mass or less, relative to the resin composition.
The lower limit of the content of the thermoplastic resin is preferably 8% by mass or more, more preferably 13% by mass or more, relative to the resin composition.

(2) Inorganic substance powder The inorganic substance powder is not particularly limited, and those contained in ordinary resin products or the like can be used. The inorganic substance powder can be used singly or in combination of two or more.

(2-1) Types of Inorganic Substance Powders Examples of inorganic substance powders include the following.
Carbonates, sulfates, silicates, phosphates, or borates of metals (calcium, magnesium, aluminum, titanium, iron, zinc, etc.);
oxides of metals (calcium, magnesium, aluminum, titanium, iron, zinc, etc.);
hydrates of the above salts or oxides;

Examples of inorganic substance powders include calcium carbonate, magnesium carbonate, zinc oxide, titanium oxide, silica, alumina, clay, talc, kaolin, aluminum hydroxide, magnesium hydroxide, aluminum silicate, magnesium silicate, calcium silicate, aluminum sulfate, magnesium sulfate, calcium sulfate, magnesium phosphate, barium sulfate, silica sand, carbon black, zeolite, molybdenum, diatomaceous earth, sericite, shirasu, calcium sulfite, sodium sulfate, potassium titanate, bentonite, graphite and the like.

The inorganic substance powder may be synthetic or derived from natural minerals.

The shape of the inorganic powder is not particularly limited, and may be particulate (spherical, irregular, etc.), flakes, granules, fibers, or the like.

(2-2) Preferred Inorganic Powder Calcium carbonate powder is preferred as the inorganic powder.
Generally, increasing the amount of calcium carbonate powder blended with respect to the resin composition facilitates increasing the rigidity of molded articles obtained from the resin composition. On the other hand, if the blending amount of calcium carbonate powder is increased in the resin composition containing the modified polyphenylene ether, the impact resistance of the molded article tends to be markedly deteriorated.
However, according to the present invention, even if the amount of calcium carbonate powder is high, by blending a predetermined amount of hydrogenated styrene-based thermoplastic elastomer, the decrease in impact resistance is suppressed and the modified polyphenylene having good rigidity is obtained. Ether-containing moldings are obtained.

The calcium carbonate powder may be either heavy calcium carbonate powder or light calcium carbonate powder.

“Heavy calcium carbonate” is calcium carbonate obtained by mechanically pulverizing (dry method, wet method, etc.) a natural raw material (limestone, etc.) containing calcium carbonate (CaCO ₃ ) as a main component.
"Light calcium carbonate" is calcium carbonate prepared by a synthetic method (such as a chemical precipitation reaction).
Therefore, heavy calcium carbonate and light calcium carbonate are clearly distinguished from each other.

From the viewpoint of having more contact interfaces with the thermoplastic resin and facilitating the effects of the present invention, the inorganic substance powder preferably contains heavy calcium carbonate powder, and the inorganic substance powder is heavy calcium carbonate. More preferably, it consists of powder.

The average particle size of the inorganic substance powder based on the air permeation method according to JIS M-8511 is preferably 0.7 μm or more and 6.0 μm or less, more preferably 1.0 μm or more, from the viewpoint of easily improving dispersibility. 0 μm or less.

In the present invention, the "average particle size" means a value calculated from the measurement results of the specific surface area by the air permeation method according to JIS M-8511. As a measuring device, for example, a specific surface area measuring device "SS-100 type" manufactured by Shimadzu Corporation can be preferably used.

(2-3) Surface Treatment of Inorganic Powder The inorganic powder may or may not be treated with a surface treatment agent.
Preferred surface treatment agents are selected from the group consisting of a surface treatment agent containing sulfonic acid, a surface treatment agent containing a sulfonate, and a surface treatment agent containing a phosphate ester, from the viewpoint of enhancing the dispersibility of the inorganic substance powder. 1 or more to be selected, and the like.
The surface treatment agents can be used singly or in combination of two or more.

In the present invention, "a surface treatment agent containing sulfonic acid" includes a surface treatment agent containing an organic substance having a sulfonic acid group.
In the present invention, the "surface treatment agent containing a sulfonate" includes surface treatment agents containing salts of organic substances having a sulfonic acid group.

As an organic substance having a sulfonic acid group,
Alkylsulfonic acids (methanesulfonic acid, ethanesulfonic acid, propane-1-sulfonic acid, propane-2-sulfonic acid, n-butane-1-sulfonic acid, n-butane-2-sulfonic acid, t-butane-2- Sulfonic acid, 2-methyl-propane-1-sulfonic acid, n-octane-1-sulfonic acid, n-octane-2-sulfonic acid, n-dodecane-1-sulfonic acid, pentadecanesulfonic acid, hexadecanesulfonic acid, octadecane sulfonic acid, dialkylsulfosuccinate, perfluorobutanesulfonic acid, perfluorooctane sulfonic acid, etc.);
Arylsulfonic acid and alkylarylsulfonic acid (benzenesulfonic acid, p-toluenesulfonic acid, m-toluenesulfonic acid, o-toluenesulfonic acid, various xylenesulfonic acids, cumenesulfonic acid, other alkylbenzenesulfonic acids, naphthalenesulfonic acid, naphthalene disulfonic acid, naphthalenetrisulfonic acid, alkylnaphthalenesulfonic acid, etc.);
Alkyldiphenyl ether disulfonic acid, laureth sulfuric acid, polyoxyethylene alkylphenol sulfonic acid, etc.
is mentioned.

Sulfonates include alkali metal salts (salts of sodium, potassium, etc.) and ammonium salts.

In the present invention, "a surface treatment agent containing a phosphoric acid ester" includes a surface treatment agent containing a phosphoric acid-based ester.

Phosphate-based esters include
Monoesters, diesters, triesters of phosphoric acid and alcohols;
monoesters, diesters, triesters of phosphoric acid and phenol;
Monoesters, diesters, triesters of phosphoric acid and alkylphenols;
Monoesters, diesters and triesters of phosphoric acid, alcohols and alkylene oxides,
Phosphate ester having a structure in which an alkyloxy group, an alkyloxyalkyleneoxy group and a hydroxy group are bonded to a phosphorus atom;
Phosphate ester having a structure having a carboxy group or a carbonyl group;
salts of the above (sodium salts, potassium salts, ammonium salts, etc.),
is mentioned.

The aliphatic hydrocarbon group in the phosphate ester is not particularly limited, but may be a saturated or unsaturated, linear, branched, or cyclic aliphatic hydrocarbon group.
The aliphatic hydrocarbon group may be substituted with a hydroxy group, an alkoxy group, an amino group, a nitro group, a cyano group, or the like.

The surface treatment method of the inorganic powder is not particularly limited.
For example, a method of adding a surface treatment agent to a slurry of an inorganic substance powder and stirring (wet method), a method of putting the inorganic substance powder and the surface treatment agent in a grinder or mixer, and stirring while heating if necessary ( dry method), and a method in which a water-containing cake of inorganic substance powder and a surface treatment agent are stirred while being heated in a mixer.

(2-4) Content of Inorganic Powder The content of the inorganic powder can be appropriately set from the viewpoint of moldability, dispersibility, and the like.

The upper limit of the content of the inorganic substance powder is preferably 86% by mass or less, more preferably 80% by mass or less, relative to the resin composition.
The lower limit of the content of the inorganic substance powder is preferably 40% by mass or more, more preferably 50% by mass or more, relative to the resin composition.

(3) Hydrogenated styrene-based thermoplastic elastomer In the resin composition of the present invention, the hydrogenated styrene-based thermoplastic elastomer is blended in an amount of 5.0% by mass or more and 20.0% by mass or less based on the resin composition. . The hydrogenated styrene thermoplastic elastomers can be used singly or in combination of two or more.

As described above, a molded article containing modified polyphenylene ether and inorganic powder has increased rigidity, but impact resistance may be compromised.
However, as a result of investigations by the present inventors, it was found that both impact resistance and high rigidity can be achieved by further blending the hydrogenated styrenic thermoplastic elastomer in the above amount.

The upper limit of the content of the hydrogenated styrene thermoplastic elastomer is 20.0% by mass or less, preferably 18.0% by mass or less, more preferably 16.0% by mass or less, relative to the resin composition.

The lower limit of the content of the hydrogenated styrenic thermoplastic elastomer is 5.0% by mass or more, preferably 6.0% by mass or more, more preferably 7.0% by mass or more, relative to the resin composition.

A "hydrogenated styrene thermoplastic elastomer" is obtained by hydrogenating a styrene thermoplastic elastomer.
A "styrenic thermoplastic elastomer" consists of a hard segment (polystyrene) and a soft segment (butadiene, isoprene, etc.).

The hydrogenated styrenic thermoplastic elastomer in the present invention is not particularly limited and includes any conventionally known ones.
Hydrogenated styrene thermoplastic elastomers include hydrogenated styrene-butadiene copolymer resins and hydrogenated styrene-isoprene copolymer resins.

From the viewpoint that the effects of the present invention can be easily exhibited, the weight average molecular weight of the hydrogenated styrene thermoplastic elastomer is preferably 10,000 or more and 100,000 or less, more preferably 15,000 or more and 95,000 or less, and still more preferably 20,000 or more and 90,000 or less.

From the viewpoint that the effects of the present invention are likely to be exhibited, the styrene unit content of the hydrogenated styrene thermoplastic elastomer is preferably 30.0% by mass or more and 80.0% by mass or less, more preferably 45.0% by mass or more. 80.0 mass % or less, more preferably 60.0 mass % or more and 80.0 mass % or less.

A commercially available product can also be used as the hydrogenated styrene thermoplastic elastomer. As such examples, "Tuftec (registered trademark) H1043" (manufactured by Asahi Kasei Corporation), "Tuftec (registered trademark) H1517" (manufactured by Asahi Kasei Corporation), "Septon (registered trademark) 2002" (manufactured by Kuraray Co., Ltd.) etc.
Among these, "Tuftech (registered trademark) H1043" is preferable from the viewpoint that the effects of the present invention are particularly likely to be exhibited. "Tuftec (registered trademark) H1043" is a hydrogenated styrene thermoplastic elastomer (styrene and butadiene It corresponds to a polymer obtained by hydrogenating the double bond portion of a block copolymer consisting of.

(4) Other components In addition to the above components, other components may or may not be added to the resin composition of the present invention as long as the effects of the present invention are not impaired.
Other components include, for example, resins (thermoplastic resins other than modified polyphenylene ether), plasticizers, lubricants, coloring agents, coupling agents, fluidity improvers (fluidity modifiers), cross-linking agents, dispersants, UV absorbers, flame retardants, foaming agents, antistatic agents and the like can be mentioned. These additives can be used singly or in combination of two or more.

However, preferred embodiments of the present invention include embodiments in which the resin composition comprises a thermoplastic resin, an inorganic powder, and a hydrogenated styrenic thermoplastic elastomer.

(5) Compounding ratio of each component In the resin composition of the present invention, the mass ratio of the thermoplastic resin to the inorganic powder (thermoplastic resin:inorganic powder) is 10:90 to 50:50, preferably 15. :85-50:50, more preferably 20:80-50:50.
In the present invention, high rigidity and good impact resistance can be achieved at the same time even in a resin composition having such a high blending ratio of inorganic powder.

In the present invention, the mass ratio of the thermoplastic resin to the hydrogenated styrene thermoplastic elastomer (thermoplastic resin:hydrogenated styrene thermoplastic elastomer) is preferably 1:2 to 10:1.

In the present invention, the mass ratio of the inorganic powder to the hydrogenated styrene thermoplastic elastomer (inorganic powder:hydrogenated styrene thermoplastic elastomer) is preferably 3:1 to 18:1.

(6) Form etc. of Resin Composition The form etc. of the resin composition of the present invention may be any form etc. according to the type of molded article to be obtained.

The form of the resin composition is not particularly limited, and examples thereof include pellets.

The shape of the pellet is not particularly limited, but examples thereof include cylindrical, spherical, ellipsoidal and the like.

The pellet size is not particularly limited. For example, spherical pellets may have a diameter of 1 mm or more and 10 mm or less. In the case of an ellipsoidal pellet, the aspect ratio may be 0.1 or more and 1.0 or less, and the length and width may be 1 mm or more and 10 mm or less. In the case of cylindrical pellets, they may have a diameter of 1 mm or more and 10 mm or less and a length of 1 mm or more and 10 mm or less.

<Method for producing resin composition>
As a method for producing the resin composition of the present invention, conventionally known methods and conditions can be employed depending on the form and application of the resin composition.

The resin composition of the present invention can be obtained, for example, by mixing or melt-kneading the constituent components.

Machines for producing the resin composition of the present invention can be selected according to the form and application of the resin composition, and include extruders, kneaders, Banbury mixers, and kneaders (twin-screw kneaders, etc.).

<Molded product>
The molded article of the present invention is made of the resin composition of the present invention, and is obtained by molding the resin composition of the present invention by any molding method.

The molded article of the present invention may have any shape according to its use.
The molded article of the present invention includes, for example, films, sheets, containers (food containers, etc.), daily necessities (various disposable products, etc.), automotive parts, electrical and electronic parts, various consumables (such as those in the field of construction materials, etc.). etc.

The method for producing the molded article of the present invention can be appropriately selected according to the molded article to be obtained.
Examples of methods for producing the molded article of the present invention include extrusion molding, injection molding, inflation molding, foam injection molding, injection compression molding, blow molding, press molding, calendar molding, and vacuum molding. etc.

The resin composition of the present invention is particularly suitable for extrusion molding or injection molding. Accordingly, the molded articles of the present invention are preferably extruded or injection molded articles.

Extruded articles include sheets, films and hollow articles.

Examples of injection-molded articles include containers, daily necessities (various disposable products, etc.), automobile parts, electrical and electronic parts, and various consumables (such as those in the field of construction materials, etc.).

EXAMPLES The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these Examples.

<Preparation of resin composition>
A resin composition was produced by the following method.

(1) Preparation of materials The following materials were prepared.
Hereinafter, the "average particle size" is a value calculated from the results of specific surface area measurement by an air permeation method according to JIS M-8511 using a specific surface area measuring device "SS-100 type" manufactured by Shimadzu Corporation. is.

(Thermoplastic resin)
Modified polyphenylene ether ("Zylon (registered trademark) 200H", manufactured by Asahi Kasei Corporation)
This resin corresponds to a polymer alloy containing polyphenylene ether and polystyrene resin.

(inorganic substance powder)
CC-1: Heavy calcium carbonate powder (average particle size: 2.2 μm, no surface treatment)
CC-2: Heavy calcium carbonate powder (average particle size: 7.2 μm, no surface treatment)
CC-3: Heavy calcium carbonate powder (surface treated with sulfonic acid, average particle size: 1.1 μm)
CC-4: light calcium carbonate powder (average particle size: 1.5 μm, no surface treatment)

(Hydrogenated styrene thermoplastic elastomer)
SEBS-1: "Tuftec (registered trademark) H1043" (manufactured by Asahi Kasei Corporation, weight average molecular weight: 39,000, styrene unit content: 67% by mass)
SEBS-2: "Tuftec (registered trademark) H1517" (manufactured by Asahi Kasei Corporation, weight average molecular weight: 76,000, styrene unit content: 43% by mass)

(2) Preparation of resin composition In the ratio shown in "Resin composition composition" in the table, each material was mixed with a co-rotating twin-screw kneading extruder "HK-25D" (φ 25 mm, L / D = 41, (manufactured by Parker Corporation), extruded strands at a cylinder temperature of 220 to 230° C., cooled and cut to prepare pellets. In this example, the pellets correspond to the resin composition of the present invention.

(3) Preparation of extruded product The obtained pellets are put into a twin-screw kneading extruder, melt-kneaded at 220 ° C., and then formed into a sheet (thickness 1.2 mm) with a T die to obtain an extruded product. Obtained.

(4) Evaluation The obtained extruded product was subjected to the following evaluations. The results are shown in "Evaluation" in the table.

(4-1) Evaluation of impact resistance Impact resistance of the extruded product was evaluated by the following method.

[Method for evaluating impact resistance]
The Charpy impact strength of each extrudate was measured according to ISO179/1eA. In this example, the higher the Charpy impact strength, the better the impact resistance.

[Evaluation Criteria for Impact Resistance]
A: The Charpy impact strength was 8 kJ/m ² or more.
B: The Charpy impact strength was 8 kJ/m ² or more and less than 5 kJ/m ² .
C: The Charpy impact strength was 5 kJ/m ² or more and less than 2 kJ/m ² .
D: Charpy impact strength was less than 2 kJ/m ² .

(4-2) Evaluation of Rigidity Rigidity of the extruded product was evaluated by the following method.

[Rigidity evaluation method]
The bending strength of each extruded product was measured according to JISK7171. In this example, higher bending strength means higher rigidity.

[Rigidity evaluation criteria]
A: Rigidity was 2500 MPa or more.
B: Rigidity was 2000 MPa or more and less than 2500 MPa.
C: Rigidity was 1500 MPa or more and less than 2000 MPa.
D: Rigidity was less than 1500 MPa.

As shown in each table, the molded articles obtained from the resin compositions satisfying the requirements of the present invention had good impact resistance and high rigidity.

When heavy calcium carbonate powder is used as the inorganic substance powder, and further when the average particle size of the heavy calcium carbonate powder is 0.7 μm or more and 6.0 μm or less, the heavy calcium carbonate powder is surface-treated. The above tendency was easy to obtain when there was

When a hydrogenated styrene thermoplastic elastomer having a weight average molecular weight of 10000 or more and 100000 or less and a styrene unit content of 30.0 mass % or more and 80.0 mass % or less is used, the above tendency is likely to be obtained. rice field.

On the other hand, when the requirements of the present invention are not satisfied, the resulting molded article tends to be inferior in impact resistance and/or rigidity.

Although data are not shown, when a surface treatment agent containing a sulfonate or a surface treatment agent containing a phosphate ester is used as a surface treatment agent for heavy calcium carbonate, and when a molded product is injection molded The same tendency as above was obtained in the case of the product as well.

Claims (7)

A resin composition,
The resin composition contains a thermoplastic resin, an inorganic powder, and a hydrogenated styrene thermoplastic elastomer,
The mass ratio of the thermoplastic resin and the inorganic substance powder is 10:90 to 50:50,
The thermoplastic resin is made of modified polyphenylene ether,
The resin composition does not contain a thermoplastic resin other than the modified polyphenylene ether,
The modified polyphenylene ether is a polymer alloy containing polyphenylene ether and a polystyrene resin,
The content of the hydrogenated styrenic thermoplastic elastomer is 5.0% by mass or more and 20.0% by mass or less with respect to the resin composition.
Resin composition. The resin composition according to claim 1, wherein the hydrogenated styrene thermoplastic elastomer has a weight average molecular weight of 10000 or more and 100000 or less and a styrene unit content of 30.0 mass% or more and 80.0 mass% or less. 2. The resin composition according to claim 1, wherein said inorganic substance powder is ground calcium carbonate powder. The ground calcium carbonate powder is ground calcium carbonate powder treated with a surface treatment agent,
The surface treatment agent is one or more selected from the group consisting of a surface treatment agent containing sulfonic acid, a surface treatment agent containing a sulfonate, and a surface treatment agent containing a phosphate ester.
The resin composition according to claim 3 . 4. The resin composition according to claim 3 , wherein the heavy calcium carbonate powder has an average particle size of 0.7 μm or more and 6.0 μm or less as measured by an air permeation method according to JIS M-8511. A molded article made of the resin composition according to any one of claims 1 to 5 . 7. The molded article according to claim 6 , wherein the molded article is an extrusion molded article or an injection molded article.