JP2017119739A - Resin composition and molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition containing a flame retardant, which has a small weight increase rate after a long-term wet heat treatment and a small weight loss rate after a high temperature treatment, and a resin composition using the same. Providing molded products. SOLUTION: It is represented by the formula (B) (1) with respect to 100 parts by weight of a resin component (A) containing 30 to 100% by weight of a polyphenylene ether resin (a1) and 70 to 0% by weight of a styrene resin (a2). A resin composition containing 4 to 26 parts by weight of the compound. Formula (1) (R1 to R4 are 2,6-xylyl groups; n is 1-3) [Selection diagram] None

Description

  The present invention relates to a resin composition that includes a polyphenylene ether resin as an essential component as a resin component, and may include a styrene-based resin as necessary, and a molded article formed by molding the resin composition.

  Polyphenylene ether resins are used in various applications such as office equipment use, automobile use, electrical and electronic equipment use, and home appliance use. As a composition containing such a polyphenylene ether resin, for example, Patent Document 1 discloses that the intrinsic viscosity measured in chloroform at 25 ° C. is about 0.34 to about 0.48 dL / w with respect to the total mass of the composition. g of poly (arylene ether), about 53 to about 63% by weight, rubber-modified polystyrene about 15 to about 25% by weight, bisphenol bis (diaryl phosphate) about 11 to about 18% by weight, alkenyl aromatic compound Disclosed is a composition comprising about 1 to about 4 weight percent of a hydrogenated block copolymer of a conjugated diene.

Special table 2014-534286

Here, as described in Patent Document 1, a phosphoric ester-based flame retardant is blended with the polyphenylene ether resin. However, as a result of investigation by the present inventor, as described in Patent Document 1, a molded product obtained by molding a resin composition in which bisphenol bis (diaryl phosphate) is blended with a polyphenylene ether resin is subjected to a long-time wet heat treatment. It was found that the rate of weight increase later was large. Further, when the present inventors have further studied, it has been found that depending on the type of flame retardant to be blended, the weight reduction rate of the molded product after high-temperature treatment is large.
The present invention aims to solve such problems, and is a resin composition containing a flame retardant, having a small weight increase rate after long-time wet heat treatment, and a weight decrease after high-temperature treatment. It aims at providing the resin composition which can provide the molded article with a small rate.

式（１）中、Ｒ¹〜Ｒ⁴は、２，６−キシリル基であり、ｎは１〜３である。
＜２＞前記樹脂成分（Ａ）が、ポリフェニレンエーテル樹脂（ａ１）４５〜９９．５重量％と、スチレン系樹脂（ａ２）５５〜０．５重量％とを含む、＜１＞に記載の樹脂組成物。
＜３＞前記樹脂成分（Ａ）が、ポリフェニレンエーテル樹脂（ａ１）７０〜９９重量％と、スチレン系樹脂（ａ２）３０〜１重量％とを含む、＜１＞に記載の樹脂組成物。
＜４＞前記スチレン系樹脂（ａ２）が、ゴム変性スチレン樹脂（ａ２−１）を含む、＜１＞〜＜３＞のいずれかに記載の樹脂組成物。
＜５＞前記スチレン系樹脂（ａ２）が、スチレン−オレフィンブロック共重合体（ａ２−２）を含む、＜１＞〜＜４＞のいずれかに記載の樹脂組成物。
＜６＞１００ｍｍ×１００ｍｍ×３ｍｍ厚の角板に成形し、８５℃、相対湿度８５％で２５００時間処理したときの重量増加率が０．５％以下である、＜１＞〜＜５＞のいずれかに記載の樹脂組成物。
＜７＞３００℃で３０分間加熱したときの重量減少率が５．０％以下である、＜１＞〜＜６＞のいずれかに記載の樹脂組成物。
＜８＞前記式（１）におけるｎが１である、＜１＞〜＜７＞のいずれかに記載の樹脂組成物。
＜９＞＜１＞〜＜８＞のいずれかに記載の樹脂組成物を成形してなる成形品。 As a result of intensive studies by the present inventors under the above problems, it has been found that the above problems can be solved by using a specific compound as a flame retardant. Specifically, the above problem has been solved by the following <1>, preferably by <2> to <9>.
<1> The resin component (A) containing 30 to 100% by weight of the polyphenylene ether resin (a1) and 70 to 0% by weight of the styrene resin (a2) is represented by the formula (1) (B). A resin composition comprising 4 to 26 parts by weight of a compound;
Formula (1)

In the formula (1), R ^{1 to} R ⁴ are 2,6-xylyl groups, and n is 1 to 3.
<2> The resin according to <1>, wherein the resin component (A) includes 45 to 99.5% by weight of a polyphenylene ether resin (a1) and 55 to 0.5% by weight of a styrene resin (a2). Composition.
<3> The resin composition according to <1>, wherein the resin component (A) includes 70 to 99% by weight of a polyphenylene ether resin (a1) and 30 to 1% by weight of a styrene resin (a2).
<4> The resin composition according to any one of <1> to <3>, wherein the styrene-based resin (a2) includes a rubber-modified styrene resin (a2-1).
<5> The resin composition according to any one of <1> to <4>, wherein the styrene-based resin (a2) includes a styrene-olefin block copolymer (a2-2).
<6><1> to <5>, which is formed into a square plate of 100 mm × 100 mm × 3 mm thickness and has a weight increase rate of 0.5% or less when treated at 85 ° C. and a relative humidity of 85% for 2500 hours. The resin composition in any one.
<7> The resin composition according to any one of <1> to <6>, wherein the weight reduction rate when heated at 300 ° C. for 30 minutes is 5.0% or less.
<8> The resin composition according to any one of <1> to <7>, wherein n in the formula (1) is 1.
<9> A molded product obtained by molding the resin composition according to any one of <1> to <8>.

  A resin composition containing a flame retardant, which can provide a molded product having a small weight increase rate after a long-time wet heat treatment and a small weight decrease rate after a high-temperature treatment, and a molded product using the resin composition Became available.

  Hereinafter, the contents of the present invention will be described in detail. In the present specification, “to” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.

式（１）中、Ｒ¹〜Ｒ⁴は、２，６−キシリル基であり、ｎは１〜３である。
このような構成とすることにより、長時間湿熱処理後の重量増加率が小さく、かつ、高温処理後の重量減少率が小さい成形品を提供可能になる。また、難燃性も維持できる。このメカニズムは定かではないが、式（１）で表される化合物は、２，６−キシリル基を有するため、高温高湿時の加水分解が抑えられると考えられる。
以下、本発明の詳細について、説明する。 The resin composition of the present invention is represented by the formula (1) (B) with respect to 100 parts by weight of the resin component (A) containing 30 to 100% by weight of the polyphenylene ether resin and 70 to 0% by weight of the styrene resin. It contains 4 to 26 parts by weight of the compound.
Formula (1)

In the formula (1), R ^{1 to} R ⁴ are 2,6-xylyl groups, and n is 1 to 3.
By adopting such a configuration, it is possible to provide a molded product having a small weight increase rate after the long-time wet heat treatment and a small weight decrease rate after the high temperature treatment. Moreover, a flame retardance can also be maintained. Although this mechanism is not clear, since the compound represented by the formula (1) has a 2,6-xylyl group, it is considered that hydrolysis at high temperature and high humidity can be suppressed.
Details of the present invention will be described below.

<Resin component (A)>
The resin component in the present invention includes 30 to 100% by weight of polyphenylene ether resin (a1) and 70 to 0% by weight of styrene resin (a2), and 30 to 99.5% by weight of polyphenylene ether resin (a1) and styrene resin. (A2) 70 to 0.5 wt% is preferably included, and polyphenylene ether resin (a1) 45 to 99.5 wt% and styrene resin (a2) 55 to 0.5 wt% are more preferable. More preferably, the polyphenylene ether resin 60 to 99.5% by weight and the styrene resin 40 to 0.5% by weight are included, the polyphenylene ether resin (a1) 70 to 99% by weight, and the styrene resin (a2) 30. More preferably, the polyphenylene ether resin (a1) is 85 to 97% by weight, and the styrene resin (a2). And even more preferably contains a 15 to 3 wt%. Moreover, the resin component in this invention may contain other resin components other than a polyphenylene ether resin (a1) and a styrene resin (a2). When other resin components are included, 5 to 30% by weight of the resin component (A) is preferable. On the other hand, the resin composition of this invention can also be set as the structure which does not contain another resin component substantially. Here, “substantially free” means less than 5% by weight of the resin component, preferably less than 3% by weight, more preferably less than 1% by weight.
Hereinafter, the polyphenylene ether resin (a1), the styrene resin (a2), and other resins will be described.

<< Polyphenylene ether resin (a1) >>
The polyphenylene ether resin used in the resin composition of the present invention is a polymer having a structural unit represented by the following formula in the main chain, and may be either a homopolymer or a copolymer.

（式中、２つのＲ^aは、それぞれ独立に、水素原子、ハロゲン原子、第１級若しくは第２級アルキル基、アリール基、アミノアルキル基、ハロアルキル基、炭化水素オキシ基、又はハロ炭化水素オキシ基を表し、２つのＲ^bは、それぞれ独立に、水素原子、ハロゲン原子、第１級若しくは第２級アルキル基、アリール基、ハロアルキル基、炭化水素オキシ基、又はハロ炭化水素オキシ基を表す。ただし、２つのＲ^aがともに水素原子になることはない。）

(In the formula, two R ^{a s} independently represent a hydrogen atom, a halogen atom, a primary or secondary alkyl group, an aryl group, an aminoalkyl group, a haloalkyl group, a hydrocarbonoxy group, or a halohydrocarbonoxy group. Each of the two R ^{b s} independently represents a hydrogen atom, a halogen atom, a primary or secondary alkyl group, an aryl group, a haloalkyl group, a hydrocarbonoxy group, or a halohydrocarbonoxy group. However, both R ^a are not hydrogen atoms.)

R ^a and R ^b are preferably a hydrogen atom, a primary or secondary alkyl group, or an aryl group. Preferable examples of the primary alkyl group include methyl group, ethyl group, n-propyl group, n-butyl group, n-amyl group, isoamyl group, 2-methylbutyl group, 2,3-dimethylbutyl group, 2 -, 3- or 4-methylpentyl group or heptyl group may be mentioned. Preferable examples of the secondary alkyl group include isopropyl group, sec-butyl group, and 1-ethylpropyl group. In particular, R ^a is preferably ^a primary or secondary alkyl group having 1 to 4 carbon atoms or a phenyl group. R ^b is preferably a hydrogen atom.

  Suitable homopolymers of polyphenylene ether resins include, for example, poly (2,6-dimethyl-1,4-phenylene ether), poly (2,6-diethyl-1,4-phenylene ether), poly (2, 2 such as 6-dipropyl-1,4-phenylene ether), poly (2-ethyl-6-methyl-1,4-phenylene ether), poly (2-methyl-6-propyl-1,4-phenylene ether), etc. , 6-dialkylphenylene ether polymer. Examples of the copolymer include 2,6-dimethylphenol / 2,3,6-trimethylphenol copolymer, 2,6-dimethylphenol / 2,3,6-triethylphenol copolymer, and 2,6-diethylphenol. 2,6-dialkylphenol / 2,3,6-trialkylphenol copolymer such as 2,3,6-trimethylphenol copolymer and 2,6-dipropylphenol / 2,3,6-trimethylphenol copolymer Polymer, graft copolymer obtained by graft polymerization of styrene to poly (2,6-dimethyl-1,4-phenylene ether), styrene to 2,6-dimethylphenol / 2,3,6-trimethylphenol copolymer And a graft copolymer obtained by graft polymerization.

  As the polyphenylene ether resin in the present invention, poly (2,6-dimethyl-1,4-phenylene ether) and 2,6-dimethylphenol / 2,3,6-trimethylphenol random copolymer are particularly preferable. In addition, polyphenylene ether resins that define the number of terminal groups and the copper content as described in JP-A-2005-344065 can also be suitably used.

  The molecular weight of the polyphenylene ether resin is preferably such that the intrinsic viscosity at 30 ° C. measured in chloroform is 0.2 to 0.8 dl / g, more preferably 0.3 to 0.6 dl / g. By setting the intrinsic viscosity to 0.2 dl / g or more, the mechanical strength of the resin composition tends to be further improved. By setting the intrinsic viscosity to 0.8 dl / g or less, the fluidity is further improved and the molding process is improved. It tends to be easier. Two or more kinds of polyphenylene ether resins having different intrinsic viscosities may be used in combination to achieve this intrinsic viscosity range.

  The method for producing the polyphenylene ether resin used in the present invention is not particularly limited. For example, a method for oxidative polymerization of a monomer such as 2,6-dimethylphenol in the presence of an amine copper catalyst according to a known method. In this case, the intrinsic viscosity can be controlled within a desired range by selecting the reaction conditions. Control of intrinsic viscosity can be achieved by selecting conditions such as polymerization temperature, polymerization time, and catalyst amount.

  In this invention, polyphenylene ether resin may be used individually by 1 type, and 2 or more types may be mixed and used for it.

<< Styrenic resin (a2) >>
Examples of the styrene resin include a polymer of a styrene monomer, a copolymer of a styrene monomer and another copolymerizable monomer, and a styrene graft copolymer. In the present invention, the styrene resin may be used alone or in combination of two or more.

Examples of the styrene resin used in the present invention include polystyrene resin (PS), rubber-modified styrene resin (also referred to as impact-resistant polystyrene, HIPS), acrylonitrile / styrene copolymer (AS resin), acrylonitrile / butadiene / styrene copolymer. Polymer (ABS resin), methyl methacrylate / acrylonitrile / butadiene / styrene copolymer (MABS resin), acrylonitrile / acrylic rubber / styrene copolymer (AAS resin), acrylonitrile / ethylene propylene rubber / styrene copolymer (AES) Resin), a resin such as a styrene / IPN type rubber copolymer, a styrene-olefin block copolymer, or a mixture thereof.
The styrene resin used in the present invention preferably contains at least one selected from a rubber-modified styrene resin (a2-1) and a styrene-olefin block copolymer (a2-2), and at least a rubber-modified styrene. It is more preferable that resin (a2-1) is included.
Further, as one embodiment of the present invention, 98 to 100% by weight of the styrene resin contained in the resin component (A) in the present invention is a rubber-modified styrene resin (a2-1) and a styrene-olefin block copolymer (a2). -2).

<< Rubber-modified styrene resin (a2-1) >>
The rubber-modified styrene resin used in the present invention is a so-called impact-resistant polystyrene (HIPS), and is obtained, for example, by polymerizing at least a styrene monomer in the presence of rubber. In the rubber-modified styrene resin, fine rubber-like particles are blended or graft-polymerized in a matrix of a styrene polymer.
Examples of rubber include polybutadiene, styrene-butadiene copolymer, polyisoprene, and ethylene-propylene copolymer.
Examples of the styrenic polymer include polystyrene and copolymers of styrene and other copolymerizable monomers, and polystyrene is preferred. Examples of the styrenic polymer include a polymer composed of a repeating unit represented by the following general formula (2) and another copolymerizable monomer containing 50% by weight or more of a repeating unit represented by the following general formula (2). And a copolymer.

（一般式（２）中、Ｒは、水素原子または炭素数１〜４のアルキル基であり、Ｚは水素原子、炭素数１〜４のアルキル基またはハロゲン原子を表し、ｎは１〜５の整数である。）
スチレン系以外の単量体としては、アクリロニトリル、メチルメタクリレートなどのビニル系単量体が挙げられる。

(In General Formula (2), R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, Z represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a halogen atom, and n is 1 to 5) (It is an integer.)
Examples of the monomer other than styrene include vinyl monomers such as acrylonitrile and methyl methacrylate.

  The content of the rubbery polymer component in the rubber-modified styrene resin is preferably in the range of 1 to 40% by weight, more preferably 3 to 30% by weight. When the monomer component other than the styrene monomer is included, the sum of the content of the rubbery polymer component and the styrene monomer component in the rubber-modified styrene resin is desirably 90% by weight or more. More preferably, it is 95% by weight or more.

As the melt flow rate (MFR) reflecting the molecular weight of the rubber-modified styrene resin, the measured value under the conditions of a temperature of 200 ° C. and a load of 5 kg is preferably in the range of 0.5 to 15 g / 10 min, more preferably 1 The range is from 0 to 10 g / 10 minutes.
Examples of commercially available rubber-modified styrene resins include HT478 manufactured by PS Japan.

When the rubber-modified styrene resin (a2-1) is blended, the blending amount is preferably 0.5 to 50% by weight of the resin component (A), and more preferably 3 to 45% by weight.
In particular, when the styrene-olefin block copolymer (a2-2) is not used as the styrene resin, the amount of the rubber-modified styrene resin (a2-1) is 10 to 50% by weight of the resin component (A). It is preferably 20 to 45% by weight. On the other hand, when used in combination with a styrene-olefin block copolymer (a2-2) described later, the amount of the rubber-modified styrene resin (a2-1) is preferably 1 to 25% by weight of the resin component (A). 10 to 10% by weight is more preferable.

<< Styrene-olefin block copolymer (a2-2) >>
The styrene-olefin block copolymer used in the present invention is a region containing a styrene-derived structural unit as a main component (styrene block) in a molecule, preferably at least at one end of the molecule, more preferably at both ends of the molecule. And a region having an olefin-derived structural unit as a main component (olefin block). Here, having a structural unit derived from styrene as a main component means that 90% by weight or more of the styrene block is composed of a structural unit derived from styrene. The same applies to the olefin block.
The styrene-olefin block copolymer used in the present invention may contain a region other than the styrene block and the olefin block, and the other region is usually 5% by weight of the styrene-olefin block copolymer. It is as follows.
Examples of the olefin include ethylene, propylene, butylene and isoprene. The styrene contained in the styrene-olefin block copolymer may be only one type or two or more types.
Specific examples of the styrene-olefin block copolymer include styrene-ethylene / propylene copolymer (SEP), styrene-butadiene-styrene copolymer (SBS), and styrene-ethylene / butylene-styrene copolymer (SEBS). Styrene-ethylene-propylene-styrene copolymer (SEPS), styrene-ethylene-ethylene-propylene-styrene copolymer (SEEPS), styrene-isoprene-styrene copolymer (SIS), polystyrene-vinyl-polyisoprene. Examples thereof include a combined triblock copolymer (PS-VPI).
Moreover, only 1 type may be sufficient as the styrene-olefin block copolymer (a2-2) used by this invention, and 2 or more types may be sufficient as it.

When mix | blending a styrene-olefin block copolymer (a2-2), 0.5-10 weight% of the resin component (A) is preferable, and, as for the compounding quantity, 0.5-5 weight% is more preferable.
In particular, when the rubber-modified styrene resin (a2-1) is not used as the styrene resin, the blending amount of the styrene-olefin block copolymer (a2-2) is 0.5 to 10% by weight of the resin component (A). % Is preferable, and 0.5 to 5% by weight is more preferable.
On the other hand, when the rubber-modified styrene resin (a2-1) is used in combination as the styrene-based resin, the blending amount of the rubber-modified styrene resin (a2-1) as the styrene-based resin is 0.5 to 0.5 of the resin component (A). 10 weight% is preferable and 0.5 to 5 weight% is more preferable.

<< Other resin components >>
As described above, the resin composition of the present invention uses a resin other than the polyphenylene ether resin (a1) and the styrene-based resin (a2) as a part of the resin component as long as the effects of the present invention are not impaired. Also good. Other resins include, for example, thermoplastic resins such as polyamide resins, polyester resins, polyphenylene sulfide resins, liquid crystal polyester resins, polycarbonate resins, polyacetal resins, polyacrylonitrile resins, acrylic resins, polyethylene resins, and polypropylene resins. And thermosetting resins such as epoxy resins, melamine resins, and silicone resins. These thermoplastic resins and thermosetting resins can be used in combination of two or more.

式（１）中、Ｒ¹〜Ｒ⁴は、２，６−キシリル基であり、ｎは１〜３である。
ｎは１または２が好ましく、１がより好ましい。
本発明で用いる式（１）で表される化合物は固体であることが好ましい。固体であると、化合物の取り扱い性に優れ、作業効率を向上させることができる。 <(B) Compound represented by Formula (1)>
The resin composition of this invention contains the compound represented by Formula (1).
Formula (1)

In the formula (1), R ^{1 to} R ⁴ are 2,6-xylyl groups, and n is 1 to 3.
n is preferably 1 or 2, and more preferably 1.
The compound represented by the formula (1) used in the present invention is preferably a solid. When it is solid, it is excellent in the handleability of the compound, and the working efficiency can be improved.

  The compound represented by Formula (1) contains 4-26 weight part with respect to 100 weight part of resin components (A). The lower limit of the amount of the compound represented by the formula (1) is preferably 5 parts by weight or more, more preferably 7 parts by weight or more with respect to 100 parts by weight of the resin component (A). More preferred are parts by weight. Moreover, the upper limit of the compounding quantity of the compound represented by Formula (1) is preferably 22 parts by weight or less, more preferably 20 parts by weight or less with respect to 100 parts by weight of the resin component (A). .

  The resin composition of the present invention may contain a flame retardant other than the compound represented by the above formula (1). However, in this invention, it can also be set as the structure which does not contain flame retardants other than said Formula (1) substantially. “Substantially free” means that the content of the compound other than the compound represented by formula (1) in the resin composition of the present invention is 5% by weight or less of the amount of the compound represented by formula (1), It is preferably 3% by weight or less, particularly preferably 1% by weight or less.

<Other ingredients>
The resin composition of this invention may contain other components other than the compound represented by the said resin component (A) and Formula (1).
Specifically, the resin composition of the present invention comprises a heat stabilizer, a flame retardant other than the above, a dye / pigment, a release agent, an antioxidant, a weather resistance improver, a nucleator, an impact resistance improver, and a plasticizer. Further, it may contain a fluidity improver and the like. When these components are contained, the total content is preferably in the range of 0.01 to 5% by weight of the resin composition.
Furthermore, you may mix | blend at least 1 sort (s) of an organic filler and an inorganic filler, for example, glass fiber, glass flakes, talc, mica, calcium carbonate, silica, clay, carbon fiber, etc. When blending these fillers, the total amount is preferably in the range of 1 to 10% by weight of the resin composition. However, in this invention, it can also be set as the structure which does not mix | blend an organic filler and an inorganic filler substantially. “Not substantially blended” means, for example, 1% by weight or less of the resin composition.

<Physical properties>
The resin composition of the present invention is preferably formed into a square plate having a thickness of 100 mm × 100 mm × 3 mm and a weight increase rate of 0.5% or less when treated at 85 ° C. and a relative humidity of 85% for 2500 hours. The weight increase rate is preferably 0.4% or less, more preferably 0.3% or less, and may be 0.2% or less. The lower limit of the weight increase rate is preferably 0%, but even 0.05% or more is sufficiently practical.
The resin composition of the present invention preferably has a weight loss rate of 5.0% or less when heated at 300 ° C. for 30 minutes. The weight reduction rate is preferably 4.5% or less, and more preferably 4.0% or less. The lower limit of the weight reduction rate is preferably 0%, but 1.0% or more, and even 2.0% or more is sufficiently practical.
The weight increase rate and the weight decrease rate in the present invention follow the methods described in Examples described later. However, when the device used in the embodiment is not available due to a waste version or the like, a device having equivalent performance can be used.
In the UL94 V combustion test, the resin composition of the present invention preferably satisfies an evaluation at 1.6 mm thickness of V-1 or more.

  As a method for obtaining the resin composition of the present invention, the above components are kneaded and pelletized with various kneaders, for example, a uniaxial and multi-axial kneader, a Banbury mixer, a roll, a Brabender plastogram, and the like. can get.

<Molded product>
The present invention also discloses a molded article formed by molding the resin composition of the present invention. Examples of the form of the molded product include a film and a housing.
The method for producing the molded article of the present invention is not particularly limited, and is a molding method generally used for thermoplastic resin compositions, for example, injection molding, hollow molding, extrusion molding, sheet molding, thermoforming, rotation. A molding method such as molding or lamination molding can be applied. In particular, when the resin composition of the present invention is formed into a film or a laminate, the resin composition is melt-extruded into a layer with one or a plurality of uniaxial or biaxial extruders, and the film is formed with a feed block and a T die. And a method of obtaining a laminate using a multi-manifold die.
The molded article of the present invention can be widely used in fields such as the electric / electronic industry, the space / aircraft industry, etc., and is particularly preferably used for photovoltaic modules, lithium batteries, and lead-acid battery cells.

  The present invention will be described more specifically with reference to the following examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

ＲＤＰ（レゾルシノールビス（ジフェニルフォスフェート））
ＣＲ−７３３Ｓ：大八化学工業製、２５℃で液体である

ＴＰＰ（リン酸トリフェニル）
ＴＰＰ：大八化学工業製、２５℃で固体である

<Resin component (A)>
(A1) Polyphenylene ether resin: PX100L, manufactured by Polyxylenol Singapore (a2-1) Rubber-modified styrene resin: HT478, manufactured by PS Japan (a2-2) Styrene-olefin copolymer: Septon 8007L, manufactured by Kuraray <Flame Retardant (B )>
Compound PX-200 represented by formula (1): manufactured by Daihachi Chemical Industry, solid at 25 ° C.

RDP (resorcinol bis (diphenyl phosphate))
CR-733S: Daihachi Chemical Industry, liquid at 25 ° C

TPP (triphenyl phosphate)
TPP: manufactured by Daihachi Chemical Industry, solid at 25 ° C

Example 1
Each component was mixed in the ratio shown in Table 1 below, and melt-kneaded at a cylinder temperature of 280 ° C. and a screw rotation speed of 350 rpm using a twin-screw extruder (manufactured by Toshiba Machine) to obtain a resin composition (pellet). . Next, the resin composition is injection-molded using an injection molding machine (manufactured by Toshiba Machine, clamping force 75T) under the conditions of a cylinder temperature of 270 ° C. and a mold temperature of 70 ° C. A test piece of a plate was prepared.
The following evaluation was performed about the obtained test piece. The results are shown in Table 1.

<Weight increase rate when treated at 85 ° C. and 85% relative humidity for 2500 hours>
The test piece obtained above was allowed to stand for 2500 hours in an environment of 85 ° C. and a relative humidity of 85%. The weight before and after standing was measured, and the weight increase rate was measured according to the following formula.
Weight increase rate (%) = (weight after standing−weight before standing) / weight before standing × 100

<Weight reduction rate when heated at 300 ° C. for 30 minutes>
The test piece obtained above was heated at 300 ° C. for 30 minutes, and the weight loss rate was measured.
Weight reduction rate (% by weight) = (weight before heating−weight after heating) / weight before heating × 100

<Flame retardance>
Using the resin composition obtained above, an injection molding machine (manufactured by Toshiba Machine Co., Ltd., clamping force 75T) was injection molded under the conditions of a cylinder temperature of 280 ° C. and a mold temperature of 70 ° C., 127 × 13 × 1 A 6 mm thick strip was molded and evaluated for flame retardancy according to the UL94 V combustion test. V-0 is most excellent in flame retardancy, and inferior in order of V-1 and V-2.

Other Examples and Comparative Examples In Example 1, the amount of each component was changed as shown in Table 1, and the others were performed in the same manner. The results are shown in Table 1.

In the said table | surface, the quantity of each component is a weight part.
As is clear from the above results, the molded product obtained by molding the resin composition of the present invention had a small weight increase rate after the long-time wet heat treatment and a small weight decrease rate after the high temperature treatment. On the other hand, when a flame retardant other than the compound represented by the formula (1) was used as the flame retardant, the weight increase rate after the long-time wet heat treatment was large or the weight decrease rate after the high temperature treatment was large ( Comparative Examples 1-4). In particular, the effect of the present invention is extremely surprising in that a large difference in effect is recognized despite the fact that the structure of the flame retardant is close.

Claims (9)

Compound (4) represented by formula (1) with respect to 100 parts by weight of resin component (A) containing 30 to 100% by weight of polyphenylene ether resin (a1) and 70 to 0% by weight of styrene resin (a2) A resin composition comprising -26 parts by weight;
Formula (1)

In the formula (1), R ^{1 to} R ⁴ are 2,6-xylyl groups, and n is 1 to 3. The resin composition according to claim 1, wherein the resin component (A) contains 45 to 99.5% by weight of a polyphenylene ether resin (a1) and 55 to 0.5% by weight of a styrene resin (a2). The resin composition according to claim 1, wherein the resin component (A) contains 70 to 99% by weight of a polyphenylene ether resin (a1) and 30 to 1% by weight of a styrene resin (a2). The resin composition according to any one of claims 1 to 3, wherein the styrene-based resin (a2) includes a rubber-modified styrene resin (a2-1). The resin composition according to any one of claims 1 to 4, wherein the styrene-based resin (a2) includes a styrene-olefin block copolymer (a2-2). In any 1 item | term of the weight increase rate when shape | molding to a square plate of 100 mm x 100 mm x 3 mm thickness, and processing for 2500 hours at 85 degreeC and 85% of relative humidity is 0.5% or less. The resin composition as described. The resin composition according to any one of claims 1 to 6, wherein a weight reduction rate when heated at 300 ° C for 30 minutes is 5.0% or less. The resin composition according to any one of claims 1 to 7, wherein n in the formula (1) is 1. The molded article formed by shape | molding the resin composition of any one of Claims 1-8.