JPH0657127A - Resin composition excellent in impact resistance - Google Patents

Abstract

PURPOSE:To obtain a resin composition excellent in the balance between impact resistance and rigidity and also in chemical resistance by mixing a polyphenylene ether resin with a polyolefin resin, a specified copolymer and a specified high impact-resistant PS resin. CONSTITUTION:The resin composition is prepared by mixing 40-95 pts.wt. polyphenylene ether resin or mixture thereof with a polystyrene resin with 2-20 pts.wt. polyolefin resin, 4-40 pts.wt. vinylaromatic compound/conjugated diene compound copolymer and/or its hydrogenation product and 1-50 pts.wt. high impact-resistant polystyrene resin of a mean rubber particle diameter of 1.5mum or above. This composition is excellent in the balance between impact resistance and rigidity and also in chemical resistance and can be used in the electrical and electronic fields, automobile field and industrial material field.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition which has an excellent balance of impact resistance and rigidity and excellent chemical resistance and which can be used in the fields of electric and electronic fields, automobile fields and various industrial material fields.

[0002]

2. Description of the Related Art Polyphenylene ether has excellent mechanical properties, electrical properties, heat resistance, low water absorption and excellent dimensional stability, but has the disadvantage of poor moldability and impact resistance. By improving the processability and impact resistance by blending with high-impact polystyrene, for example, industrial parts, electric / electronic parts,
Office equipment housing Widely used as resin moldings for automobile parts and precision parts. However, although the classical polyphenylene ether resin composition composed of this polyphenylene ether and high-impact polystyrene has improved impact resistance, it has the drawback of being inferior in chemical resistance. A technique for blending polyolefins to improve the chemical resistance of polyphenylene ether is Japanese Patent Publication No.
Although it is disclosed in No. 69, the fact is that it cannot be put into practical use due to defects such as delamination of the layer and weak impact strength because no compatibilizer is added.

Several techniques have been disclosed for improving impact resistance, chemical resistance and compatibility of polyphenylene ether resin and polyolefin resin. JP-A-53-7115
No. 8 discloses impact resistance improvement by blending a premixture of a hydrogenated product of a polyolefin resin and a vinyl aromatic compound-conjugated diene compound copolymer with a polyphenylene ether resin. Japanese Patent Laid-Open No. 54-889
No. 60 discloses impact resistance improvement with a hydrogenated product of a polyphenylene ether resin, a polyolefin resin, a vinyl aromatic compound-conjugated diene compound block copolymer or a vinyl aromatic compound-conjugated diene compound block copolymer. There is.

JP-A-56-51356 discloses the improvement of the adhesion between a polyphenylene ether resin and a polyolefin resin with a hydrogenated product of a polyphenylene ether resin, a polyolefin resin and a vinyl aromatic compound-conjugated diene compound block copolymer. ing. JP-A-59-10
No. 0159 discloses impact resistance improvement with a hydrogenated product of a polyphenylene ether resin, a polyolefin resin and a vinyl aromatic compound-conjugated diene compound diblock copolymer. JP-A-62-179561 discloses improvement of fluidity, glossiness and impact resistance with a composition comprising a polyphenylene ether resin, a polyethylene resin having a density of 0.94 or less and rubber. JP-A-63-218748
JP-A-63-245453, JP-A-1-1393
6, JP-A-1-40556, JP-A-2-92957.
In No. 1, blending polyphenylene ether resin, polystyrene resin and premixed polyolefin and vinyl aromatic compound-conjugated diene compound block copolymer,
Improvements in stress crack resistance and impact resistance are disclosed. JP-A-2-225563 discloses that the dispersion of hydrogenated polyphenylene ether resin, polyolefin and a specific vinyl aromatic compound-conjugated diene compound block copolymer is 0.3 μm or less, and improvement in chemical resistance is disclosed. There is. JP-A-3-157451 discloses chemical resistance, impact resistance, and delamination improvement by blending a polyphenylene ether resin, a polyolefin, and two specific types of vinyl aromatic compound-conjugated diene compound block copolymers. .

In Japanese Patent Application Laid-Open No. 58-103557, a polyolefin resin is used as a matrix and a polyphenylene ether resin and a specific vinyl aromatic compound-conjugated diene compound block copolymer or vinyl aromatic compound-conjugated diene compound block copolymer are used. Fluidity with hydrogenates,
Improved brittleness is disclosed. Japanese Patent Laid-Open No. 60-76547
In the publication, a polyolefin resin is used as a matrix, and a polyphenylene ether resin and a specific vinyl aromatic compound-
Hydrogenated blends of conjugated diene compound block copolymers or vinyl aromatic compound-conjugated diene compound block copolymers are disclosed. JP-A-63-831
No. 49 discloses a blend of a polyolefin resin, a polyphenylene ether resin, and a hydrogenated product of a specific vinyl aromatic compound-conjugated diene compound block copolymer. JP-A-63-225642 discloses a blend of a hydrogenated product of a polyolefin resin, a polyphenylene ether resin, and a specific vinyl aromatic compound-conjugated diene compound block copolymer.

[0006]

However, in the technologies disclosed in the past, impact resistance decreases as the amount of the polyphenylene ether resin decreases, especially when the polyphenylene ether resin containing the polystyrene resin is the matrix. There was a problem to go. As a solution to this problem, if a large amount of impact-resistant polystyrene resin is added to improve the impact resistance, the rigidity decreases, and the rigidity and the impact resistance cannot be balanced. Further, when a large amount of a polyolefin resin and a vinyl aromatic compound-conjugated diene compound block copolymer or a hydrogenated product thereof is added, there is a problem that rigidity similarly decreases.

An object of the present invention is to obtain a resin composition having an excellent balance between impact resistance and rigidity and excellent chemical resistance.

[0008]

Means for Solving the Problems As a result of intensive studies in view of this point, the present inventors have found that polyphenylene ether resin containing polyphenylene ether resin or polystyrene resin, polyolefin resin, vinyl aromatic compound-conjugated diene By blending a hydrogenated compound block copolymer and / or a vinyl aromatic compound-conjugated diene compound block copolymer with a high impact polystyrene resin having a specific rubber particle size, a balance between impact resistance and rigidity can be obtained. The present inventors have found that impact resistance and chemical resistance can be improved without losing the present invention.

The present invention includes (A) a polyphenylene ether resin or a polyphenylene ether resin containing a polystyrene resin, 40 to 94 parts by weight, (B) a polyolefin resin, 2 to 20 parts by weight, and (C) a vinyl aromatic compound-conjugate. Hydrogenated product of diene compound copolymer and / or vinyl aromatic compound-conjugated diene compound copolymer 4 to 40 parts by weight, (D) impact-resistant polystyrene resin having an average rubber particle size of 1.5 μm or more 1 to 50 There is provided a resin composition comprising:

The present invention will be described in detail below. (A) component polyphenylene ether resin (hereinafter simply referred to as P
Abbreviated as PE) is a bonding unit

[0011]

[Chemical 1]

The reduced viscosity (0.5 / deciliter, chloroform solution, measured at 30 ° C.) is 0.30 to 0.
It is a homopolymer and / or copolymer in the range of 70, more preferably in the range of 0.40 to 0.65. This P
Specific examples of PE include, for example, poly (2,6-dimethyl-1,4-phenylene ether), poly (2-methyl-6-ethyl-1,4-phenylene ether), poly (2-methyl-). 6-phenyl-1,4-phenylene ether), poly (2,6-dichloro-1,4-phenylene ether), and the like, and further, 2,6-dimethylphenol and other phenols (for example, 2,3). , 6-trimethylphenol and 2-methyl-6-butylphenol) are preferable, and among them, poly (2,6-dimethyl-1,4-phenylene ether), 2,6-dimethylphenol and 2,3,3. A copolymer with 6-trimethylphenol is preferable, and poly (2,6-dimethyl-1,4-phenylene ether) is particularly preferable.

The PPE is not particularly limited as long as it is obtained by a known method, and for example, a complex of cuprous salt and amine by Hay described in US Pat. No. 3,306,874 is used as a catalyst, For example 2,
It can be easily produced by oxidative polymerization of 6-xylenol. In addition, US Pat. No. 3,306,875
US Pat. No. 3,257,357, US Pat. No. 325
It can be easily produced by the method described in Japanese Patent No. 7358 and Japanese Patent Publication No. 52-18880.

The PPE used in the present invention is the above-mentioned PPE.
In addition to PE, the PPE and α, β-unsaturated carboxylic acid or a derivative thereof in the presence or absence of a radical generator in a molten state, a dissolved state or a slurry state of 80-
Modified PPE obtained by reacting at a temperature of 350 ° C (0.01 to 10% by weight is grafted or added)
The above PPE and the modified PPE
May be a mixture in any ratio.

The polystyrene resin usable as the component (A) may be a homopolymer of a vinyl aromatic compound or a resin containing a monomer copolymerizable with the vinyl aromatic compound. Examples of the vinyl aromatic compound include styrene, α-methylstyrene, α-
Ethylstyrene, α-methylstyrene-p-methylstyrene, o-methylstyrene, m-methylstyrene, p-
Nuclear alkyl-substituted styrenes such as methylstyrene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, p-bromostyrene, dichlorostyrene, dibromostyrene, trichlorostyrene, trihalostyrene, and other halogenated styrenes. Of these, styrene and α-methylstyrene are preferred.

Examples of the monomer copolymerizable with the vinyl aromatic compound include vinyl cyanide such as acrylonitrile, methacrylonitrile, fumaronitrile and maleonitrile, methyl methacrylate, methyl acrylate and methacrylic acid. Acrylic acid, maleic anhydride and the like can be mentioned, of which acrylonitrile is preferred. In the present invention, the amount of component (A) is in the range of 40 to 94 parts by weight, preferably 55 to 91 parts by weight.
Polystyrene resin as 100 parts by weight of component (A) is
5 to 95 parts by weight, preferably 10 to 90
Parts by weight.

In the present invention, the component (B) polyolefin resin is a polyolefin resin having a number average molecular weight of 30,000 or more, which is used as a usual molding material, and examples thereof include high density polyethylene and ultra high molecular weight high density. Polyethylene, low-density polyethylene, linear low-density polyethylene, ultra-low-density polyethylene with a density of less than 0.90, isotactic polypropylene, ethylene, propylene, other α-olefins, unsaturated carboxylic acids or their derivatives A copolymer of two or more compounds,
For example, ethylene / butene-1 copolymer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer, propylene / ethylene (random, block) copolymer, propylene / 1-hexene Examples thereof include a copolymer, a propylene / 4-methyl-1-pentene copolymer, and poly (4-methyl-1-pentene), polybutene-1, and the like. These are not only one type but also two or more types. Can be used together. Of these polyolefin resins, polyethylene is preferable, and ethylene / propylene copolymer, low density polyethylene, linear low density polyethylene, and high density polyethylene are preferable. The polyolefin resin is in the range of 2 to 20 parts by weight,
It is preferably 3 to 15 parts by weight.

Next, the hydrogenated product of the vinyl aromatic compound-conjugated diene compound copolymer or the vinyl aromatic compound-conjugated diene compound copolymer (hereinafter referred to as the compatibilizer) of the component (C) in the present invention is , A copolymer obtained by copolymerizing a vinyl aromatic compound and a conjugated diene compound, a hydrogenated product of a copolymer obtained by copolymerizing a vinyl aromatic compound and a conjugated diene compound (to a copolymerized conjugated diene compound At least 5 of olefinic double bonds based on
0% or more, preferably 80% or more is hydrogenated), and at least one of these is used, and they may be used in combination. Examples of the copolymerization form of this compatibilizer include a random copolymer, a block copolymer, a graft copolymer and a combination thereof, and among them, the block copolymer is preferable.

As the vinyl aromatic compound constituting this compatibilizer, for example, one or more selected from styrene, α-methylstyrene, vinyltoluene, p-tert-butylstyrene, diphenylethylene and the like. Of these, styrene is preferred. Examples of the conjugated diene compound include butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3.
One or more selected from butadiene and the like, and among them, butadiene, isoprene and combinations thereof are preferable.

Examples of such a compatibilizer include a styrene-butadiene copolymer obtained by anionic polymerization and a hydrogenated product of this styrene-butadiene copolymer. No. 1,130,770, U.S. Pat. No. 3,281,38
No. 3,639,517 and British Patent No. 1,020,720, US Pat. Nos. 3,333,024 and 4,501,857. Can be easily manufactured by the above method.

As this compatibilizer, for example,
Asahi Kasei Kogyo Co., Ltd. “Toughprene”, “Sorprene”, “Tuffden”, “Asaprene”, “Tuftec”
What is marketed by the brand name can be used. Further, if necessary, even if the unsaturated portion of the structure (for example, butadiene portion) such as styrene-butadiene copolymer is saturated by hydrogenation by a known method, α, β-unsaturated Saturated carboxylic acid or its derivative in the presence or absence of a radical generator,
80-300 in molten, dissolved or slurry state
It may be a modified elastomer obtained by reacting at a temperature of ° C, or may be a mixture of the above elastomer with the hydrogenated elastomer and a modified elastomer. The hydrogenated product of the vinyl aromatic compound-conjugated diene compound copolymer or the vinyl aromatic compound-conjugated diene compound copolymer is in the range of 4 to 40 parts by weight, preferably 6 to 30 parts by weight.

Next, the high impact polystyrene resin of the component (D) of the present invention can be copolymerized with a vinyl aromatic compound or its vinyl aromatic compound and another vinyl aromatic compound in the presence of a conjugated diene rubber. It is a resin obtained by polymerizing a monomer. The amount of conjugated diene rubber is in the range of 3 to 30% by weight, preferably 4 to 12% by weight. The rubber average particle size of impact-resistant polystyrene resin is
The thickness is 1.5 μm or more, and preferably 2.5 μm or more.
The conjugated diene rubber generally includes all rubbers used for producing impact-resistant polystyrene resin. For example,
Polybutadiene (low cis polybutadiene, high cis polybutadiene), styrene-butadiene copolymer (SB
R), polyisoprene, butadiene-isoprene copolymer, natural rubber and the like, and butadiene polymer and styrene-butadiene copolymer are particularly preferable examples. The vinyl aromatic compound used here is
It is equivalent to the vinyl aromatic compound contained in the component (A). Preferred vinyl aromatic compounds include styrene polymers and styrene-acrylonitonyl copolymers. The average particle size of the rubber-like polymer particles in the impact-resistant polystyrene resin is measured by a method well known to those skilled in the art, for example, a phase-contrast microscope, a transmission electron microscope, a centrifugal sedimentation method, a call counter method, or the like. it can. The method used in the present invention is the call counter method, and the average particle diameter is volume average. The component (D) is a substantially continuous phase, but the rubber particles are present in the dispersed phase. The rubber average particle diameter in the resin composition obtained by melt-kneading the components (A), (B), (C), and (D) is taken by a transmission electron microscope to obtain a high impact polystyrene type. The volume average particle diameter of only the rubber particle component of the resin is measured. In the present invention, the component (D) is in the range of 1 to 50 parts by weight, preferably 3 to 30 parts by weight.

The resin composition of the present invention is obtained by melt-kneading the above-mentioned component (A), component (B), component (C) and component (D), and is obtained by various molding methods shown below. An example of the melt-kneading method is a method of melt-kneading using an extruder or the like, but it is not particularly limited as long as it is a generally-used kneading method. As a feeding method, a method of charging the materials all at once, a method of side-feeding a part of the materials, and a method of feeding the pre-kneaded material can be considered, but any method may be used. The kneading temperature may be the glass transition point of PPE (about 210 ° C.) or higher, but preferably 220 ° C. or higher.
The temperature is 350 ° C, more preferably 230 ° C to 320 ° C. The resulting resin composition has continuous phases (A) and (D).
And the dispersed phases were (B) and (C).

In the present invention, in addition to the above-mentioned components, other optional components such as an antioxidant, a weather resistance improver and a polyolefin composition may be added as needed within a range not impairing the characteristics and effects of the present invention. Nucleating agents, slip agents, inorganic or organic fillers and reinforcing agents (glass fiber, carbon fiber, whiskers,
Mica, talc, calcium carbonate, potassium titanate,
(Wollastonite, etc.), flame retardants (halogen flame retardants, red phosphorus, phosphorus compound flame retardants such as triphenyl phosphate), flame retardant aids, plasticizers, various colorants, antistatic agents, release agents, etc. You may add it.

The resin composition of the present invention may be molded by any commonly used molding method such as injection molding, extrusion molding, compression molding, blow molding, etc., and the shape of the resulting resin composition may be any. It is not limited and is not restricted by the molding method.

[0026]

【Example】

[Reference Example 1: Preparation of PPE] After the inside of a stainless steel reactor having an oxygen blowing port at the bottom of the reactor and having a cooling coil and stirring blades inside was sufficiently replaced with nitrogen, cupric bromide 53. Then, 8.75 kg of 2,6-xylenol was dissolved in a mixed solvent of 6 g, 1110 g of di-n-butylamine, 20 liters of toluene, 16 liters of n-butanol and 4 liters of methanol and charged into a reactor. Oxygen was continuously blown into the reactor while stirring to carry out polymerization for 180 minutes. In addition, in order to maintain the internal temperature at 30 ° C., water was circulated through the cooling coil during the polymerization. After the polymerization was completed, the precipitated polymer was filtered off and a methanol / hydrochloric acid mixture was added,
PPE in the form of a pale yellowish white powder is obtained by decomposing the residual catalyst in the polymer, further thoroughly washing with methanol and then drying.
(Reduced viscosity 0.54) was obtained. [Reference Example 2: Hydrogenated product of styrene / butadiene block copolymer] Nitrogen-substituted 50 liter stirrer, 33.1 liters of cyclohexane and 1.16 kg of styrene were charged into a jacketed autoclave and stirred.
The temperature was raised to 0 ° C. Further, 5.4 g of tetramethylethylenediamine and 2.8 g of sec-butyllithium were added, and 6
Polymerized for 0 minutes. Then, 2.31 kg of butadiene was supplied to the autoclave and polymerized for 90 minutes. After polymerization of butadiene for a predetermined time, 1.16 kg of styrene was further supplied to the autoclave and polymerization was continued for 60 minutes to obtain a block copolymer having a polystyrene-polybutadiene-polystyrene structure as a whole. When the block copolymer obtained here was analyzed, the amount of bound styrene was 50% by weight, the number average molecular weight of the polystyrene block segment was 26,800, the molecular weight distribution of the entire polymer was 1.03, and the 1,2 bond amount of the polybutadiene block segment was 41%. Met.

The block copolymer obtained here was further subjected to a hydrogenation reaction in the same manner as in Examples 1 to 12 of JP-B-63-5401 to obtain a structure of polystyrene-hydrogenated polybutadiene-polystyrene. A hydrogenated block copolymer having a hydrogenation rate of 99.9% in the polybutadiene block segment was synthesized. [Reference Example 3: Preparation of high-impact polystyrene] Polybutadiene used in the examples was prepared by the following method. Inner volume 10
Using a liter agitated autoclave with a jacket as a reactor, a butadiene / n-hexane mixture (butadiene concentration 20%) was added at n- at 20 liter / hr.
Butyllithium / n-hexane solution (concentration 5%) 70
It was introduced at a rate of milliliter / hr and continuous polymerization of butadiene was carried out at a polymerization concentration of 110 ° C. The obtained active polymer was deactivated with methanol, and 2,6-ditertiarybutylhydroxytoluene was added as an antioxidant in an amount of 0.5 per polymer.
Part was added to remove the solvent. Table 1. No. A polybutadiene of 1 was obtained.

The high impact polystyrene resin used in the examples was produced by a bulk polymerization method. A typical example will be described below. 10 parts of polybutadiene 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, and the mixture was heated at 80 ° C. for 4 hours. Polymerization was carried out with stirring at 110 ° C. for 4 hours and at 150 ° C. for 4 hours. Further, heat treatment was performed at about 230 ° C. for 30 minutes, and then unreacted styrene and ethylbenzene were removed in vacuum to obtain an impact-resistant styrene-based resin.

The content of polybutadiene in the high-impact polystyrene resin thus obtained was 11%, and the average particle size of polybutadiene with polystyrene dispersed particles contained was 2.5 μm. Next, a method for measuring and evaluating physical properties of the resin composition will be described. (0) Preparation of test piece Injection molding machine (FANUC CORPORATION MODEL 50D
A test piece was prepared at a cylinder temperature of 280 ° C. and a molding cycle of 1 minute). (1) Izod impact strength ASTM D258, notch: Yes (2) Flexural modulus ASTM D790 (3) Chemical resistance Chemical resistance evaluation by creep rupture tester (100 mm
Put resin in a mold of × 100mm × thickness of 2mm and set it to 250
Width of 4m for sample molded at ℃, preheat 3 minutes, press 2 minutes
Adjust m × length 70 mm × thickness 2 mm and anneal at 80 ° C. for 48 hours. One end of this sample was attached to a creep rupture machine manufactured by Seiwa Riko, a load of 1 kg was set on the other end, and 0.2 g of salad oil (manufactured by Nisshin Oil Co., Ltd.) was applied to 20 mm from the load setting end, and the time until rupture. To measure. (The measurement room is a constant temperature room at 23 ° C and 50% humidity)

[0030]

Example 1 21 parts by weight of polyphenylene ether having a reduced viscosity of 0.54, 48 parts by weight of polystyrene (685; manufactured by Asahi Kasei Kogyo Co., Ltd.), 7 parts by weight of low density polyethylene (Suntech LD-M1804; manufactured by Asahi Kasei Kogyo Co., Ltd.) Department,
Styrene-butadiene copolymer (Asaflex 805
Asahi Kasei Co., Ltd. 7 parts by weight, styrene-butadiene copolymer (Sorprene T406 Nippon Elastomer Co., Ltd.) 7 parts by weight, Table 1. No. 1 part of high impact polystyrene, Irga. Knox 3114
(Ciba Geigy) 0.2 parts, PEP36 (Asahi Denka)
0.6 part was blended with a Henschel mixer and a twin-screw co-direction extruder (ZSK-25; Werner & Pfleid
(manufactured by erer) was melt-kneaded at a cylinder temperature of 280 ° C. to obtain extruded strands as pellets. The pellets obtained here were supplied to an injection molding machine set at 280 ° C., and a test piece was injection molded under the condition of a mold temperature of 80 ° C. The results are shown in Table 2.

As can be seen from the comparison with Comparative Example 3, the impact strength is greatly improved, the difference in flexural modulus is small, and the balance between impact resistance and rigidity and the chemical resistance are excellent.

[0032]

Comparative Example 1 21 parts by weight of polyphenylene ether of Example 1, 48 parts by weight of polystyrene, No. Example 1 was repeated with 35 parts by weight of polyphenylene ether and 44 parts by weight of polystyrene blended in place of 10 parts by weight of 1 impact polystyrene. The results are shown in Table 2.

[0033]

Comparative Example 2 Example 1 was repeated by blending 30 parts by weight of polyphenylene ether and 48 parts by weight of polystyrene in place of 35 parts by weight of polyphenylene ether and 44 parts by weight of polystyrene of Comparative Example 1. The results are shown in Table 2.

[0034]

Comparative Example 3 Example 1 was repeated except that 21 parts by weight of polyphenylene ether and 58 parts by weight of polystyrene were blended instead of 35 parts by weight of polyphenylene ether and 44 parts by weight of polystyrene of Comparative Example 1. The results are shown in Table 2. As can be seen from Comparative Examples 1 to 3, the smaller the PPE content, the lower the Izod impact strength.

[0035]

Comparative Example 4 No. 1 in Table 1 of Example 1 No. 1 instead of high impact polystyrene. 2 Example 10 was repeated, blending 10 parts of high impact polystyrene. The results are shown in Table 2. Impact-resistant polystyrene has an average rubber particle size of 0.7μ
When it is m, the Izod impact strength is significantly reduced.

[0036]

Example 2 34 parts by weight of polystyrene instead of 44 parts by weight of polystyrene of Comparative Example 1, No. 1 in Table 1 were used. Example 1 was repeated, blending 10 parts by weight of high impact polystyrene. The results are shown in Table 2. Compared to Comparative Example 1, it has excellent balance of impact resistance and rigidity, and excellent chemical resistance.

[0037]

Third Embodiment No. 1 in Table 1 of the first embodiment. No. 1 instead of high impact polystyrene. Example 1 was repeated, blending 10 parts of 3 high impact polystyrene. The results are shown in Table 2. Compared with Comparative Example 4, when the average rubber particle size of impact-resistant polystyrene is 1.5 μm, the balance between impact resistance and rigidity and chemical resistance are excellent.

[0038]

Comparative Example 5 48 parts by weight of polystyrene of Comparative Example 4, N
o. 2 instead of 10 parts by weight of high impact polystyrene, 28 parts by weight of polystyrene, No. 2 Example 1 was repeated, blending 30 parts by weight of high impact polystyrene. The results are shown in Table 2. The flexural modulus is lower than that of Example 1, and the chemical resistance is also slightly lower.

[0039]

Example 4 69 parts by weight of polyphenylene ether having a reduced viscosity of 0.54, low density polyethylene (Suntech LD-
M1804; Asahi Kasei Kogyo Co., Ltd. 7 parts by weight, styrene-butadiene copolymer (Asaflex 805; Asahi Kasei Kogyo KK) 7 parts by weight, styrene-butadiene copolymer (Sorprene T406; Nippon Elastomer Co., Ltd.) Made)
7 parts by weight, Table 1. No. Impact-resistant polystyrene 1
0 parts, triphenyl phosphate (TP as flame retardant
P; Daihachi Chemical Co., Ltd.) 15 parts, Irganox 3114 (Ciba Geigy) 0.2 part as a stabilizer, PEP36 (Asahi Denka Co., Ltd.) 0.6 part were blended with a Henschel mixer,
Twin-screw co-direction extruder (ZSK-25; Werner & Pf
Cylinder temperature of 280
Melt kneading at 0 ° C. to obtain extruded strands as pellets. The pellets obtained here were supplied to an injection molding machine set at 280 ° C., and a test piece was injection molded under the condition of a mold temperature of 80 ° C. The results are shown in Table 2.

Compared with Comparative Example 6, the impact resistance and the rigidity are balanced and the chemical resistance is excellent.

[0041]

[Comparative example 6] No. 1 high-impact polystyrene was used instead of 10 parts by weight. 2 Impact-resistant polystyrene 1
Example 4 was repeated, blending 0 parts by weight. The results are shown in Table 2.

[0042]

Example 5 Example 1 was repeated by adding 7 parts by weight of high-density polyethylene (Suntech B-871; manufactured by Asahi Chemical Industry Co., Ltd.) in place of the low-density polyethylene of Example 1. The results are shown in Table 3.

[0043]

Example 6 Example 1 was repeated except that 7 parts by weight of polypropylene (Suntec E-1100; manufactured by Asahi Kasei Kogyo Co., Ltd.) was added in place of the low density polyethylene of Example 1. The results are shown in Table 3.

[0044]

Example 7 Instead of the low density polyethylene of Example 1, linear low density polyethylene (Suntech LF2408;
Example 1 was repeated with the addition of 7 parts by weight of Asahi Kasei Corporation. The results are shown in Table 3.

[0045]

Example 8 7 parts by weight of the styrene-butadiene copolymer (Asaflex 805; manufactured by Asahi Kasei Kogyo KK) of Example 1 and a styrene-butadiene copolymer (Sorprene T40).
6; Nippon Elastomer Co., Ltd.) 7 parts by weight, 1 part of the hydrogenated styrene-butadiene block copolymer of Reference Example 2 (Tuftec H-1051: Asahi Chemical Industry Co., Ltd.)
4 parts were added and Example 1 was repeated. The results are shown in Table 3.

[0046]

Comparative Example 7 Example 1 was prepared by adding 10 parts by weight of rubber-modified polystyrene having an average rubber particle size of 0.7 μm in place of 10 parts by weight of high impact polystyrene having an average rubber particle size of 2.5 μm. I repeated. The results are shown in Table 3.

[0047]

Comparative Example 8 Example 1 was repeated by blending 48 parts by weight of polystyrene of Example 8, 7 parts by weight of low density polyethylene and 69 parts by weight of polystyrene instead of 14 parts by weight of hydrogenated styrene-butadiene copolymer. The results are shown in Table 3. Compared with Example 8, when the polyolefin resin and the styrene-butadiene block copolymer were not blended, the impact resistance was significantly reduced and the chemical resistance was also significantly reduced.

[0048]

Comparative Example 9 Example 1 was repeated except that 48 parts by weight of polystyrene of Example 1 and 55 parts by weight of polystyrene were blended instead of 7 parts by weight of low-density polyethylene. The results are shown in Table 3.
It was shown to. The chemical resistance is significantly reduced as compared with Example 1.

[0049]

[Table 1]

[0050]

[Table 2]

[0051]

[Table 3]

[0052]

According to the present invention, it is possible to provide a resin composition having an excellent balance of impact resistance and rigidity and excellent chemical resistance.

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Claims (1)

[Claims] 1. A polyphenylene ether resin containing (A) a polyphenylene ether resin or a polystyrene resin, 40 to 94 parts by weight, (B) a polyolefin resin, 2 to 20 parts by weight, (C) a vinyl aromatic compound-conjugated diene compound. Hydrogenated product of copolymer and / or vinyl aromatic compound-conjugated diene compound copolymer, 4 to 40 parts by weight, (D) impact-resistant polystyrene resin having an average rubber particle size of 1.5 μm or more 1 to 50 parts by weight A resin composition having excellent impact resistance, which is characterized by comprising parts.