JPH0632975A - Polyphenylene ether resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin compsn. excellent in low-temp. impact resistance and thermal stability and useful as a molding material by compounding a polyphenylene ether resin with a specified amt. of a specific high-impact styrene resin component. CONSTITUTION:10-90 pts.wt. polyphenylene ether resin [e.g. poly(2,6-dimethyl-1,4- phenylene) ether], 90-10 pts.wt. high-impact styrene resin component, and 0-20 pts.wt. block copolymer as an optional component are compounded. The styrenic resin component comprises a high-impact styrenic resin which contains a conjugated diene rubber having a 1,2-vinyl bond content of 5wt.% or lower and a cis-1,4-bond content of 90wt.% or higher (e.g. a resin obtd. by polymerizing styrene in the presence of a hydrogenated polybutadiene) and a partially hydrogenated conjugated diene rubber which is obtd. by hydrogenating 5-70wt.% of all the double bonds of a conjugated diene rubber and has a 1,2-vinyl bond content of 3wt.% or lower and a cis-1,4-bond content of 30wt.% or higher (e.g. polybutadiene) in a wt. ratio of the high-impact styrenic resin to the partially hydrogenated conjugated diene rubber of 0.2-5.0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyphenylene ether resin composition having both excellent impact resistance at low temperature and thermal stability.

[0002]

2. Description of the Related Art Polyphenylene ether resin is heat resistant,
It is a resin that has excellent characteristics such as electrical characteristics, acid resistance, alkali resistance, and low specific gravity and low water absorption, but on the other hand, its low fluidity makes it difficult to perform melt molding, and also has low impact strength. It has the drawback of being slightly brittle.
In order to remedy these drawbacks at the same time, a technique of compounding high impact polystyrene with polybutadiene has been developed and disclosed in US Pat. No. 3,383,435. In addition to this, Japanese Patent Publication No. 54-20537 discloses a technique of blending impact-resistant polystyrene using polybutadiene having a specified microstructure. The technology of the Japanese Examined Patent Publication is 1,4-in the entire microstructure of polybutadiene.
The content of the cis bond and the content of the vinyl group are 50% by weight or more and 10% by weight or less, respectively. However, in these technologies, there is no extreme difference in the degree of change in physical properties due to oxidative deterioration based on the chemical instability of the double bond, regardless of the microstructure, and there is no melt molding, heat exposure or light exposure. It was very difficult to avoid the deterioration of physical properties due to such factors.

On the other hand, a technique of reinforcing with a hydrogenated styrene-butadiene block copolymer containing almost no double bond is disclosed in, for example, Japanese Patent Publication No. 50-71742, which is also heat stable. Although it has excellent properties, it has low rubber efficiency because it does not contain dispersed particles of styrene resin in the particles like impact-resistant styrene resin rubber particles, and it is necessary to add a large amount of rubber component to improve impact resistance. was there. Moreover, the affinity between the hydrogenated styrene-butadiene block copolymer and the polyphenylene ether is not always sufficient, so that peeling often occurs in the molded product. In addition, the higher the hydrogenation rate of the 1,4-butadiene component in the polybutadiene block, the higher the glass transition temperature of the rubber component, and thus such a technique cannot provide sufficient low temperature impact resistance. Apart from this, as a technique for improving the impact strength while maintaining the rigidity of the impact resistant styrene resin, a technique using an impact resistant styrene resin containing a partially hydrogenated conjugated diene rubber is disclosed in JP-A-64-90208. It is disclosed in the official gazette, and it is shown that the impact strength is improved as compared with the conventional impact-resistant styrene resin. But,
The polyphenylene ether-based resin is characterized by high heat resistance, and in the region containing a large amount of 1,2-vinyl residues in the technique disclosed in the publication, the physical properties are greatly deteriorated when molded at high temperature or exposed to heat. There is a problem. Furthermore, there are problems such as low temperature impact strength not being obtained in the region of high hydrogenation rate, and it shows a sufficiently satisfactory technical range of impact resistant styrene resin required for improving the physical properties of polyphenylene ether resin. It can't be. As a technique for improving the thermal stability and the low temperature impact resistance, the hydrogenation rate of the impact resistant styrene resin containing the partially hydrogenated conjugated diene rubber, the 1,2-vinyl residue, and the 1,4-vinyl bond amount A technique for defining the above is disclosed in Japanese Patent Application Laid-Open No. 3-143953, and a very balanced resin composition is obtained. But,
Among the conventional impact-resistant styrene resins, an impact-resistant styrene resin containing a conjugated diene rubber having a 1,2-vinyl bond content of 5% by weight or less and a cis-1,4 bond content of 90% by weight or more. It is inferior in impact resistance at low temperature as compared with the case of using a resin. It is presumed that this is because the glass transition temperature of the conjugated diene rubber rises due to hydrogenation and loses rubber-like properties.

[0004]

The object of the present invention is to provide a polyphenylene ether resin having an excellent balance of thermal stability and impact resistance at low temperature in imparting molding processability and impact resistance to the polyphenylene ether resin. To obtain the composition.

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have found that when a polyphenylene ether resin is reinforced with an impact-resistant styrene resin containing a conjugated diene rubber, heat stability The impact-resistant styrene-based resin containing partially hydrogenated rubber with excellent properties and the 1,2-vinyl bond with excellent low-temperature impact resistance at 5% by weight or less are cis-
The impact-resistant styrene-based resin containing a conjugated diene rubber having a 1,4 bond content of 90% by weight or more is used together in a specific ratio to provide an excellent balance between thermal stability and impact resistance at low temperatures. It was found that a polyphenylene ether-based resin composition was obtained, and the present invention was completed based on this finding.

That is, the present invention relates to (a) a polyphenylene ether resin of 10 to 90 parts by weight, (b) an impact-resistant styrene resin, the following (b-1) / (b-2):
90-1 whose ratio is 0.2-5.0 weight ratio
0 parts by weight, (b-1) comprises a conjugated diene rubber having a 1,2-vinyl bond content of 5% by weight or less and a cis-1,4 bond content of 90% by weight or more, impact resistance The styrene resin (b-2) is hydrogenated with 5 to 70% by weight of all double bonds of the conjugated diene rubber, and 1,2-
Vinyl bond is less than 3% by weight, 1,4 bond amount is 30% by weight
Containing the partially hydrogenated conjugated diene rubber as described above,
The present invention relates to a resin composition comprising an impact-resistant styrene-based resin and, if necessary, 0 to 20 parts by weight of a block copolymer (c).

The present invention will be described in detail below. The polyphenylene ether-based resin used as the component (a) of the composition of the present invention means the general formulas (I) and (II),

[0008]

[Chemical 1]

[0009]

[Chemical 2]

(In the formula, R1, R2, R3, R4, R5
R6 is a monovalent residue such as an alkyl group having 1 to 4 carbon atoms, an aryl group, halogen and hydrogen, and R5 and R6 are not hydrogen at the same time. ) Is a repeating unit, and a homopolymer or a copolymer in which the structural unit is composed of the general formulas (I) and (II) can be used. Typical examples of homopolymers of polyphenylene ether-based resins include poly (2,6-dimethyl-1,4-phenylene ether and poly (2-methyl-
6-ethyl 1,4-phenylene) ether, poly (2,
6-diethyl-1,4-phenylene) ether, poly (2-ethyl-6-n-propyl-1,4-phenylene) ether, poly (2,6-di-n-propyl-1,)
4-phenylene) ether, poly (2-methyl-6-n)
-Butyl-1,4-phenylene) ether, poly (2-
Ethyl-6-isopropyl-1,4-phenylene) ether, poly (2-methyl-6-chloroethyl-1,4-)
Phenylene) ether, poly (2-methyl-6-hydroxyethyl-1,4-phenylene) ether, poly (2
Examples thereof include homopolymers such as -methyl-6-chloroethyl-1,4-phenylene) ether.

The polyphenylene ether copolymer is 2,
Copolymer of 6-dimethylphenol and 2,3,6-trimethylphenol or copolymer of o-cresol or 2,3,6-trimethylphenol and o-
It includes a polyphenylene ether copolymer mainly composed of a polyphenylene ether structure such as a copolymer with cresol.

In the present invention, the content of the polyphenylene ether resin is preferably in the range of 10 to 90 parts by weight.
When the content is less than 10 parts by weight, the improvement effect of the polyphenylene ether resin is not sufficiently exerted, which is not preferable, and when the content exceeds 90% by weight, a sufficient amount of resistance to improve molding processability or impact resistance is obtained. It is not preferable because the impact styrene resin cannot be added.

Examples of the styrene resin used in the present invention include styrene compounds, compounds copolymerizable with styrene compounds, and rubbery polymers. The styrene compound is represented by the general formula (III)

[0014]

[Chemical 3]

(Wherein R represents hydrogen, lower alkyl or halogen, Z is selected from the group consisting of vinyl, hydrogen, halogen and lower alkyl, and p is an integer of 0 to 5) Means Specific examples thereof include styrene, α-methylstyrene, 2,4-dimethylstyrene, monochlorostyrene, p-methylstyrene, p-tert-butylstyrene, ethylstyrene and the like. Further, as the compound copolymerizable with the styrene compound, methacrylic acid esters; methyl methacrylate, ethyl methacrylate, etc., unsaturated nitrile compounds; acrylonitrile, methacrylonitrile, etc.,
Examples thereof include acid anhydrides such as maleic anhydride, which are used together with styrene compounds. As the rubbery polymer, polybutadiene (low cis polybutadiene and high cis polybutadiene) styrene-butadiene copolymer, polyisoprene, butadiene-isoprene copolymer, natural rubber and the like are generally used. In the present invention, the content of the impact resistant styrene resin is preferably selected from the range of 90 to 10 parts by weight. If the content exceeds 90 parts by weight, the required amount of polyphenylene ether resin cannot be added, and if it is less than 10 parts by weight, the rubber component cannot be sufficiently contained, resulting in impact resistance and environmental cracking resistance. It is not preferable because the property cannot be improved sufficiently. The method for producing the impact resistant styrene resin of the present invention is not limited, and any of bulk polymerization, solution polymerization, emulsion polymerization and suspension polymerization well known to those skilled in the art may be used.

Impact-resistant styrene resin (b-1) of the present invention
Used for an impact-resistant styrene-based resin containing a conjugated diene rubber having a 1,2-vinyl bond content of 5% by weight or less and a cis-1,4 bond content of 90% by weight or more, which is used as a component. Rubbers are known in the known manner, for example, with the following heterogeneous catalysts: chromium compounds adsorbed on an inorganic support or organometallic compounds (eg trialkylaluminium) and transition metal compounds (eg halogenides, especially titanium chloride, titanium iodide or Lithium halogenide) is used to prepare butadiene by stereoregular polymerization in an inert hydrocarbon solution using a catalyst containing the reaction product.

Impact-resistant styrene resin (b-2) of the present invention
5 to 70% by weight of the total double bonds of the conjugated diene rubber used as the component is hydrogenated, and 1,2-
Vinyl bond is less than 3% by weight, 1,4 bond amount is 30% by weight
Containing the partially hydrogenated conjugated diene rubber as described above,
The partially hydrogenated conjugated diene rubber used for the impact resistant styrene resin is obtained by partially hydrogenating the conjugated diene rubber obtained by a known method. The conjugated diene rubber obtained by a known method generally includes all rubbers used for producing impact resistant styrene resins. For example, polybutadiene, styrene-butadiene copolymer,
Polyisoprene, butadiene-isoprene copolymer, natural rubber and the like are preferred, and polybutadiene is most preferred. The preferred amount of 1,2-vinyl bonds in the total double bonds of the conjugated diene rubber is not particularly limited because it depends on the hydrogenation rate of the total double bonds, but is generally 5% by weight or more. Is desirable. When the hydrogenation rate is increased to improve the thermal stability, the rubber elasticity is lost, but the more the 1,2-vinyl bonds are, the less the rubber elasticity is reduced. In the present invention,
The partially hydrogenated conjugated diene rubber has 5 to 7 out of all double bonds.
0 wt% is hydrogenated and the 1,2-vinyl bond content is 3
It is desirable that the content is 1% by weight or less, preferably 2% by weight or less, and the amount of 1,4-bond is 30% by weight or more. When the hydrogenation rate of all double bonds is less than 5% by weight, the effect of partial hydrogenation is not sufficiently exerted. For example, hydrogenation of conjugated diene rubber having a 1,2-vinyl content of 8% by weight before hydrogenation to 5% by weight cannot reduce the 1,2-vinyl content to 3% by weight or less, and the total double bond Even if hydrogenated at 5% by weight,
Impact resistance and environmental crack resistance can hardly be improved. When the hydrogenation rate exceeds 70% by weight, impact resistance, especially low temperature impact resistance, cannot be sufficiently obtained, which is not preferable. If the 1,2-vinyl bond content in the partially hydrogenated diene rubber exceeds 3% by weight, the rubber component will be oxidized and the main chain splitting of the styrene resin will be more easily induced, resulting in thermal stability. It is not preferable because the property cannot be improved sufficiently. Further, if the 1,4-bond amount is less than 30% by weight, the effect of improving impact resistance becomes poor, which is not preferable. The partially hydrogenated conjugated diene rubber can be obtained by partially hydrogenating the above-mentioned supporting diene rubber. As the hydrogenation method, any conventionally known method may be used. L. Ramp. et a
l, J. Amer. Chem. , 83, 4672 (19
61), a method of hydrogenating using the triisbutylborane catalyst described in Hung Yu Chen, J .; Poly
m. Sci. Polym. Letter Ed. , 1
5,271 (1977), a method of hydrogenating using toluenesulfonyl hydrazide, or Japanese Examined Patent Publication No.
A method of hydrogenating using an organic cobalt-organic aluminum-based catalyst or an organic nickel-organic aluminum-based catalyst described in JP-A-2-8704 can be mentioned.
A particularly preferred method of hydrogenation in the practice of the present invention is
The method disclosed in JP-A-52-41890 using a catalyst capable of selectively hydrogenating 1,2-vinyl bonds prior to 1,4-bonds, or hydrogenation under mild conditions of low temperature and low pressure JP-A-59-1332 using possible catalysts
No. 03, JP-A No. 60-220147.

The impact-resistant styrene resin (b
The ratio of -1) / (b-2) is preferably 0.2 to 5.0 weight ratio. If it is less than 0.2, impact resistance at low temperature is insufficient, and if it exceeds 5.0, thermal stability is insufficient. It is enough. A particularly preferred range is 0.2 to 4.5. The block copolymer which is the component (c) of the present invention is a block copolymer composed of at least one styrene polymer block and at least one olefin elastomer block.

The styrene-based polymer block referred to in the present invention is specifically represented by the general formula (III),

[0020]

[Chemical 4]

(Wherein R represents hydrogen, lower alkyl or halogen, Z is selected from the group consisting of vinyl, hydrogen, halogen and lower alkyl, and p is an integer of 0 to 5) Is a polymer or copolymer block derived from The olefin elastomer block referred to in the present invention includes monoolefins such as ethylene, propylene, 1-butene and isobutylene, conjugated diolefins such as butadiene, isoprene and 1,3-pentadiene, 1,4-hexadiene and norbornene derivatives. A polymer block having a form in which one or more olefin compounds selected from non-conjugated diolefins are polymerized or copolymerized, and the unsaturation degree of the block is 20% or less. Therefore, when the above diolefins are used as the constituent monomers of the olefin elastomer block, the degree of unsaturation of the block portion is 2
Measures to reduce the degree of unsaturation, such as hydrogenation, must be taken to the extent that it does not exceed 0%. Further, a styrene compound may be randomly copolymerized with the olefin elastomer block.

Other additives to the composition of the present invention, such as:
It is possible to add plasticizers, stabilizers, ultraviolet absorbers, flame retardants, colorants, mold release agents and fibrous reinforcing agents such as glass fibers and carbon fibers, and fillers such as glass beads, calcium carbonate and talc. it can. As the stabilizer, phosphite esters, hindered phenols, sulfur-containing antioxidants, alkanolamines, acid amides, dithiocarbamic acid metal salts, inorganic sulfides, metal oxides alone or in combination. Can be used.

Any method may be used for mixing the respective components constituting the present invention. For example, an extruder, a heating roll, a Banbury mixer, a kneader or the like may be used.

[0024]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples.
Hereinafter,% and parts represent% by weight and parts by weight, respectively. In addition,
The impact-resistant styrene resin used in the following examples and comparative examples was prepared by the production method described below. Table 1 shows the impact-resistant styrene resins used in Examples and Comparative Examples, and the conjugated diene rubbers and partially hydrogenated rubbers used to prepare the same.

[0025]

Production Example 1 Production of Partially Hydrogenated Conjugated Diene Rubber: The partially hydrogenated conjugated diene rubber used in the examples was typically produced by the method described below. Using a stirrer with an internal volume of 10 liters and an autoclave with a jacket as a reactor,
20 l of n-hexane mixed solution (butadiene concentration 20%)
/ Hr, n-butyllithium / n-hexane solution (concentration 5%) was introduced at 70 ml / hr, and the polymerization temperature was 110 ° C.
Continuous polymerization of butadiene was carried out. The obtained active polymer was deactivated with methanol, and 8 liters of the polymer solution was transferred to another reactor with a stirrer and a jacket having an internal volume of 10 liters, and at a temperature of 60 ° C., di-p-as a hydrogenation catalyst. 250 ml of trilbis (1-cyclopentadienyl) titanium / cyclohexane solution (concentration 1.2 mmol / l)
And n-butyllithium solution (concentration 6 mmol / l) 5
A mixture of 0 ml and 0 ° C. under a hydrogen pressure of 2.0 kg / cm ² was added, and a hydrogen partial pressure of 3.0 kg / cm ² was added to 60.
Let react for minutes. The resulting partially hydrogenated polymer solution was added with 0.5 part of 2,6-di-t-butylhydroxytoluene per polymer as an antioxidant to remove the solvent. The analytical values of polybutadiene before partial hydrogenation and partial hydrogenated polybutadiene obtained by sampling after deactivation of methanol are shown in Table 1.

[0026]

[Production Example 2] Production of high impact styrene resin: The high impact styrene resin used in the examples was produced by a bulk polymerization method. A typical example will be described below. 10 parts of partially hydrogenated polybutadiene in Table 1 was dissolved in 90 parts of styrene and 8 parts of ethylbenzene, and 0.05 part of benzoyl peroxide and 0.10 part of α-methylstyrene dimer were added to styrene. , 8
Polymerization was carried out under stirring at 0 ° C. for 4 hours, 110 ° C. for 4 hours, and 150 ° C. for 4 hours. Further, heat treatment was carried out at around 230 ° C. for 30 minutes, and then unreacted styrene and ethylbenzene were removed in vacuum to obtain an impact-resistant styrene resin. The content of partially hydrogenated polybutadiene in the obtained impact-resistant styrene-based resin was 11%, and the average particle diameter of partially hydrogenated polybutadiene in the state of containing dispersed polystyrene particles was 2.7 μm. The impact-resistant styrenic resin produced in the same manner is shown in Table 2 below.

Next, the method for evaluating the physical properties of the resin composition will be described. (1) Adjustment of test piece An injection molding machine manufactured by Toshiba Machine Co., Ltd., IS80EPN, cylinder temperature 290 ° C, molding cycle 1 minute to prepare a test piece. (2) IZOD impact strength-ASTM D256, notch: Yes-Temperature: 23 ° C and -30 ° C (3) DART impact strength Graphic impact tester (manufactured by Toyo Seiki Co., Ltd.) is used to measure total absorbed energy did.

-Temperature: 23 ° C and -30 ° C (4) Molding stability Molding was carried out by allowing the molded product molded at an injection molding temperature of 290 ° C to remain in the cylinder at 320 ° C for 10 minutes with respect to the IZOD impact strength, and then molded. It was judged from the retention rate of the IZOD impact strength of the product.

(5) Heat resistance exposure IZ after aging at a temperature of 110 ° C. for 500 hours
It was judged from the retention rate of the OD impact strength and the increase rate of the melting index.

[0030]

Example 1 Intrinsic viscosity 0.50 (in chloroform, 30
45 parts of poly (2,6-dimethyl-1.4-phenylene) ether (hereinafter abbreviated as PPE) (measured at 0 ° C.), NO. 10 parts of high impact polystyrene (hereinafter abbreviated as HIPS) of No. 3, No. 3 of Table 2. 45 HIPS of 1,
And octadecyl-3- (3,5-di- as a stabilizer
t-butyl-4-hydroxyphenyl) propionate 0.3 parts, tris (2,4-di-t-butylphenyl)
0.3 parts of phosphite was used for 2 in an inert gas atmosphere using a PCM-30 twin-screw extruder (manufactured by Ikegai Tekko KK).
The resin composition was obtained by melt-kneading at a temperature of 70 ° C. Table 3 shows the results of physical property tests of the resin composition.

[0031]

[Example 2] The NO. HIP of 3
S for 27.5 parts, NO. Example 1 was repeated except that the HIPS of 1 was changed to 27.5 parts to obtain a resin composition. Table 3 shows the results of physical property tests of the resin composition.

[0032]

[Embodiment 3] In Table 1, NO. HIP of 3
S for 35 parts, NO. Example 1 was repeated except that the HIPS of 1 was changed to 20 parts to obtain a resin composition. Table 3 shows the results of physical property tests of the resin composition.

[0033]

[Embodiment 4] NO. HIP of 3
S for 45 parts, NO. Example 1 was repeated except that the HIPS of 1 was changed to 10 parts to obtain a resin composition. Table 3 shows the results of physical property tests of the resin composition.

[0034]

[Comparative Example 1] The NO. HIP of 3
S for 5 parts, NO. Example 1 was repeated except that the HIPS of 1 was changed to 50 parts to obtain a resin composition. Table 3 shows the results of physical property tests of the resin composition.

[0035]

[Comparative Example 2] The NO. HIP of 3
S for 47 parts, NO. Example 1 was repeated except that the HIPS of 1 was changed to 8 parts to obtain a resin composition. Table 3 shows the results of physical property tests of the resin composition.

[0036]

[Comparative Example 3] In Table 1, NO. HIP of 3
55 parts of S, NO. Example 1 was repeated except that HIPS of No. 1 was not added to obtain a resin composition. Table 4 shows the results of physical property tests of the resin composition.

[0037]

[Comparative Example 4] The NO. HIP of 3
S is not added, and NO. Example 1 was repeated except that 55 parts of HIPS of 1 was added to obtain a resin composition. Table 4 shows the results of physical property tests of the resin composition.

[0038]

[Embodiment 5] NO. HIP of 1
S to NO. A resin composition was obtained in the same manner as in Example 1 except that the HIPS was changed to 2. Table 4 shows the results of physical property tests of the resin composition.

[0039]

[Sixth Embodiment] No. 2 in Table 2 in the second embodiment. HIP of 1
S to NO. A resin composition was obtained in the same manner as in Example 2, except that the HIPS was changed to 2. Table 4 shows the results of physical property tests of the resin composition.

[0040]

[Embodiment 7] NO. HIP of 1
S to NO. A resin composition was obtained in the same manner as in Example 4, except that the HIPS was changed to 2. Table 4 shows the results of physical property tests of the resin composition.

[0041]

[Comparative Example 5] In Table 5, NO. HIP of 3
S is not added, and NO. Example 5 was repeated except that 55 parts of HIPS 2 of 2 was added to obtain a resin composition. Table 4 shows the results of physical property tests of the resin composition.

[0042]

[Embodiment 8] In Table 3, NO. HIP of 1
S to NO. A resin composition was obtained in the same manner as in Example 3, except that the HIPS of No. 4 was changed. Table 5 shows the results of physical property tests of the resin composition.

[0043]

[Embodiment 9] NO. HIP of 1
S to NO. A resin composition was obtained in the same manner as in Example 1 except that the HIPS of No. 4 was changed. Table 5 shows the results of physical property tests of the resin composition.

[0044]

[Embodiment 10] NO. HI of 1
PS to NO. A resin composition was obtained in the same manner as in Example 3, except that the HIPS of No. 5 was changed. Table 5 shows the results of physical property tests of the resin composition.

[0045]

[Embodiment 11] NO. HI of 1
PS to NO. A resin composition was obtained in the same manner as in Example 1 except that the HIPS of No. 5 was changed. Table 5 shows the results of physical property tests of the resin composition.

[0046]

[Comparative Example 6] The NO. HIP of 3
S is not added, and NO. Example 1 was repeated except that 55 parts of HIPS of 4 was added to obtain a resin composition. Table 5 shows the results of physical property tests of the resin composition.

[0047]

[Comparative Example 7] The NO. HI of 3
No PS was added and NO. Example 1 was repeated except that 55 parts of HIPS of 5 was added to obtain a resin composition. Table 5 shows the results of physical property tests of the resin composition.

[0048]

Example 12 Intrinsic viscosity 0.50 (3 in chloroform
45 parts of poly (2,6-dimethyl-1.4-phenylene) ether (measured at 0 ° C.) (hereinafter abbreviated as PPE),
The NO. Impact-resistant polystyrene of 3 (hereinafter HIPS
Abbreviated as 10), NO. HIPS 40 of 1
Parts, Kraton G1650 (manufactured by Shell Chemical Corporation) as a block copolymer, and octadecyl-3- (3,5-di-t-butyl-4) as a stabilizer.
-Hydroxyphenyl) propionate (0.1 part) and tris (2,4-di-t-butylphenyl) phosphite (0.2 part) were inactivated using a PCM-30 twin-screw extruder (manufactured by Ikegai Tekko KK). A resin composition was obtained by melt-kneading at a temperature of 270 ° C. in a gas atmosphere. Table 6 shows the physical property test results of the resin composition.

[0049]

[Embodiment 13] NO. H of 3
20 copies of IPS, NO. Example 12 was repeated except that the HIPS of 1 was changed to 20 parts to obtain a resin composition. Table 6 shows the physical property test results of the resin composition.

[0050]

[Embodiment 14] NO. H of 3
40 copies of IPS, NO. Example 12 was repeated except that the HIPS of 1 was changed to 10 parts to obtain a resin composition. Table 6 shows the physical property test results of the resin composition.

[0051]

[Comparative Example 8] The NO. HI of 3
50 parts of PS, NO. Example 12 was repeated except that HIPS 1 of 1 was not added to obtain a resin composition. Table 6 shows the physical property test results of the resin composition.

[0052]

[Comparative Example 9] The NO. HI of 3
No PS was added and NO. Example 12 was repeated except that 50 parts of HIPS 1 was added to obtain a resin composition. Table 6 shows the physical property test results of the resin composition.

[0053]

[Table 1]

[0054]

[Table 2]

[0055]

[Table 3]

[0056]

[Table 4]

[0057]

[Table 5]

[0058]

[Table 6]

[0059]

The polyphenylene ether resin composition of the present invention is a useful molding material having an excellent balance of thermal stability and impact resistance at low temperatures. The molded article of the composition of the present invention is a molding material suitable for automobile exterior parts, water supply / drainage equipment, ship exterior parts, and the like, and is easy to recycle by utilizing good thermal stability.

Claims (1)

[Claims] 1. A polyphenylene ether resin (a)
10 to 90 parts by weight (b) Impact-resistant styrene-based resin, which has the following (b-
The ratio of 1) / (b-2) is 90 to 10 parts by weight of resin having a weight ratio of 0.2 to 5.0, and (b-1) has 1,2-vinyl bonds of 5% by weight or less and cis. An impact-resistant styrene-based resin (b-2) containing a conjugated diene rubber having a -1,4 bond content of 90% by weight or more is 5 to 5 out of all double bonds of the conjugated diene rubber. 70% by weight is hydrogenated, and
An impact-resistant styrene resin containing a partially hydrogenated conjugated diene rubber having a 1,2-vinyl bond content of 3% by weight or less and a 1,4 bond content of 30% by weight or more after hydrogenation. Further, if necessary, a resin composition comprising 0 to 20 parts by weight of a block copolymer (c).