JPH0718173A - Polyphenylene ether-polyolefin resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition, good in balance among physical properties of fluidity, heat, impact and chemical resistance, having <=1 specific gravity thereof and an ultrahigh industrial value and reduced in its weight as compared with that of usual engineering plastics. CONSTITUTION:This resin composition is composed of (A) 5-90 pts.wt. polyphenylene ether resin, (B) 10-95 pts.wt. olefin polymer, (C) 10-20 pts.wt. at least one A-B-A type hydrogenated block copolymer selected from the group consisting of (C-1) A-B-A type hydrogenated block copolymers (A is polymer block of alkenylaromatic compound; B is polymer block of diene-based hydrocarbon compound) having >50wt.% content of A and (C-2) A-B-A type hydrogenated block copolymers having <=50wt.% content of A, (D) 0-20 pts.wt. graft copolymer obtained by kneading an ethylenic copolymer with an aromatic vinyl monomer and (E) 0.05-20 pts.wt. polymer of an unsaturated carboxylic acid or its derivative.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a polyphenylene ether resin suitable for large molded articles such as automobile interior panels, which has a good balance of physical properties such as fluidity, heat resistance, impact resistance (low temperature impact) and chemical resistance. And a resin composition comprising a polyolefin resin.

[0002]

2. Description of the Related Art Polyphenylene ether resin (hereinafter referred to as PP
(Abbreviated as E) is widely used in the industrial field because of its good heat resistance. However, due to lack of fluidity, PPE is rarely used alone. In order to make up for this drawback, a polymer alloy modified with a polystyrene resin is generally used as a modified PPE.
However, the impact resistance is still insufficient in practical use, and it has been attempted to improve impact resistance by adding various elastic bodies (elastomers) without impairing the original properties. There is. A typical example of this elastomer is an ABA type triblock copolymer composed of an alkenyl aromatic compound A and a conjugated diene compound B or a hydrogenated product thereof. Various elastomers of this series are commercially available depending on the molecular weight and the like, but the addition of these elastomers has not yet led to the realization of practical physical properties in a well-balanced manner.

For the purpose of supplementing this, a polyolefin (hereinafter abbreviated as PO) resin is added to the ABA type elastomer to improve impact resistance. US Pat.
66, 055, 4,239, 673, etc., but the compatibility between resins is insufficient and still insufficient. Further, since the above composition is insufficient in compatibility between the polyphenylene ether resin and the polyolefin resin, the blending amount of the polyolefin resin is the upper limit of 10% by weight, and if it is added more than that, phase separation occurs, The situation was that practical use was impossible. For this reason, the other drawback of the PPE-based resin, that is, the improvement in chemical resistance, was not achieved, and it remained as a major problem. More recently, for environmental protection reasons, weight reduction has been highlighted as an essential technology in the automobile industry.

Based on the above industrial background, PPE / PO
Several methods have been proposed for alloying the system. First, regarding PPE / PO alloys, Japanese Patent Publication No. 42-70
It has been proposed to mix PO with PPE in 69 at an arbitrary ratio. However, at this point, the compatibilization technology is immature,
It has not reached the point of exhibiting the characteristics of both resins, leaving problems for practical use. After that, JP-A-58-10355
Since it was proposed to add a block copolymer such as SEBS as a third component as a compatibilizing agent in No. 7, a wide variety of block copolymers, modified elastomers and the like have been proposed. Among these, some have been confirmed to have effects of compatibilization, but from an economic viewpoint, they have not yet been put to practical use as satisfactory technologies. On the other hand, as proposed in Japanese Examined Patent Publication No. 54-44026, it has been considered to modify both resins by some method to improve the compatibility. Although many proposals have been made to modify PPE by various methods to improve the compatibility based on the added functional group after that, the process becomes complicated and an economical problem remains.

[0005]

DISCLOSURE OF THE INVENTION The present invention achieves the above-mentioned problems, that is, the flowability, chemical resistance and impact resistance (low temperature impact) required for PPE resins in a well-balanced manner,
It is an object to realize further weight reduction.

[0006]

Means for Solving the Problems In solving the above-mentioned problems, the inventors of the present invention dramatically improve the compatibility of both resins by modifying PPE and PO with a polymer of unsaturated carboxylic acid. I found it. In addition, as a result of trying various methods for melt-kneading this modification with a normal twin-screw extruder, so-called reactive processing was adopted.
The present invention has been completed by confirming that alloying can be realized under economically advantageous conditions by adopting the step-pressing method. That is, the present invention relates to (A) polyphenylene ether resin 5 to
90 parts by weight, (B) polyolefin-based polymer 10 to 9
5 parts by weight of (C) (C-1) A-B-A type hydrogenated block copolymer (A is a polymer block of an alkenyl aromatic compound and B is a polymer block of a diene hydrocarbon compound). And the content of A exceeds 50% by weight, (C-2) ABA type hydrogenated block copolymer (A is a block of an alkenyl aromatic compound, B is a block of a diene hydrocarbon compound) 10 to 20 parts by weight of at least one ABA type hydrogenated block copolymer selected from the group consisting of those having a content of A of 50% by weight or less, ) A graft polymer having a high grafting efficiency, obtained by kneading an ethylene-based copolymer and a vinyl aromatic monomer, and having 0 to 20 parts by weight of a graft polymer obtained by graft-polymerizing an aromatic vinyl polymer on an ethylene-based (co) polymer. Part, (E) unsaturated cal Emissions Sanmata is a resin composition consisting of polymer 0.05 to 20 parts by weight of a derivative thereof.

The polyphenylene ether resin (A) used in the present invention (hereinafter abbreviated as PPE) is a polymer having a structural unit represented by Chemical formula 1 in the main chain, and it may be a homopolymer or a copolymer. For example, poly (2,6-dimethyl-1,4phenylene) ether, poly (2,6-diethyl-1,4-phenylene) ether, poly (2,6-dipropyl-1,4phenylene) ether, poly (2-methyl), 6-propyl-1,4 phenylene) ether and the like can be mentioned, but especially poly (2,
6-dimethyl-1,4 phenylene) ether, 2,6-dimethylphenol and 2,3,6-trimethylphenol copolymer are preferred.

[Chemical 1] (In the formula, R1 is a lower alkyl group having 1 to 3 carbon atoms, R2,
R3 is a hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms. )

The olefin polymer (B) used in the present invention is a crystalline or amorphous olefin polymer, and specifically, high density polyethylene, low density polyethylene, polypropylene, propylene-ethylene copolymer. ,
Polymers of olefins themselves such as poly-4-methylpentene-1, ring-opening polymers of cyclic olefin compounds, conjugated dienes, predominant amounts of olefins and vinyl monomers copolymerizable therewith (for example, acrylates). , Methacrylic acid esters, glycidyl (meth) acrylate and the like). These can be used alone or as a mixture of two or more kinds. Of these polyolefins, polyethylene and polypropylene are preferable, and polypropylene is particularly preferable. These polyolefins can be prepared by a method known to those skilled in the art, for example, "Encyclopedia of Polymer Science and Technology" (ENCYCLOPED).
IA OF POLIMER SCIENCE AND
TECHNOLOGY) Volume 6, 275 pages (published in 1967) and 11 volumes, 597 pages (published in 1969) [John.
Wairi. and. Sands Company (John Wiley & S
ons, Inc. )].

The (C) ABA type hydrogenated block copolymer used in the present invention is a triblock copolymer composed of a polymer block A of an alkenyl aromatic compound and a polymer block B of a conjugated diene hydrocarbon compound. At least one kind of coalesced or hydrogenated products having different contents of A is added. That is, the content of the A component in the triblock copolymer (C-1) is 50% by weight, particularly preferably 60 to 80% by weight, and the content of the A component in the triblock copolymer (C-2) is Is selected to be less than or equal to 50 weight percent, particularly preferably between 20 and 40 weight percent. Although the molecular weight of these copolymers is not particularly limited, the former is preferably 70,000 to 200,000 and the latter is preferably 100,000 to 300,000 in terms of physical property balance. As specific examples of these, hydrogenated styrene-butadiene-styrene triblock products (hereinafter abbreviated as SEBS) such as those manufactured by Shell Co., Ltd., trade name: Clayton, water such as Kuraray Co., Ltd., trade name Septon Examples thereof include an added styrene-isoprene-styrene triblock body (hereinafter abbreviated as SEPS).

An aromatic vinyl polymer is added to the ethylene (co) polymer having a high grafting efficiency, which is obtained by kneading the (D) ethylene copolymer used in the present invention and an aromatic vinyl monomer. The graft-polymerized graft polymer means an ethylene (co) polymer suspended in water, a mixture of one or more specific radical-copolymerizable organic peroxides, an aromatic vinyl monomer and Add a solution of radical polymerization initiator,
By impregnating the above polymer and heating under specific conditions,
Aromatic vinyl polymer is graft-polymerized on ethylene (co) polymer, which is a grafting precursor and has high grafting efficiency obtained by kneading with a polymer of ethylene copolymer and vinyl aromatic monomer. This is the resin composition. The method for producing the graft precursor will be described in more detail. 100 parts by weight of the ethylene-based (co) polymer is suspended in water, and separately from 5 to 400 parts by weight of the aromatic vinyl monomer, a radical ( One or a mixture of two or more kinds of (co) polymerizable organic peroxides is added in an amount of 0.01 to 100 parts by weight of the aromatic vinyl monomer.
A solution in which 5 parts by weight is dissolved is added, and the mixture is heated under conditions where decomposition of the radical polymerization initiator does not substantially occur. Aromatic vinyl monomer, radical (co) polymerizable organic peroxide and radical polymerization initiator Is impregnated in an ethylene-based (co) polymer, and when the total amount of free aromatic vinyl monomer and radical (co) polymerizable organic peroxide is less than 50% by weight, It is a resin obtained by raising the temperature and completely copolymerizing an aromatic vinyl monomer and a radical (co) polymerizable organic peroxide in an ethylene (co) polymer.

The radical (co) polymerizable organic peroxide is, for example, a compound represented by Chemical formula 2.

[Chemical 2] (In the formula, R ₁ is a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, R ₂ is a hydrogen atom or a methyl group, R ₃ and R ₄ are each an alkyl group having 1 to 4 carbon atoms, and R ₅ is a carbon group. It represents an alkyl group having 1 to 12 carbon atoms, a phenyl group, an alkyl-substituted phenyl group, or a cycloalkyl group having 3 to 12 carbon atoms, m is 1 or 2, and a radical (co) polymerizable organic peroxide. The oxide may be a compound represented by Chemical formula 3. Specifically, t-butylperoxyacryloyloxyethyl carbonate and t-butylperoxyallyl carbonate can be exemplified as preferable ones.

[Chemical 3] (In the formula, R ₆ is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R ₇ is a hydrogen atom or a methyl group, R ₈ and R ₉ are each an alkyl group having 1 to 4 carbon atoms, and R ₁₀ is a carbon group. An alkyl group having a number of 1 to 12, a phenyl group, an alkyl-substituted phenyl group or a cycloalkyl group having a carbon number of 3 to 12 is shown, n is 0, 1 or 2.

A preferred example of the ethylene-based (co) polymer is a low-density ethylene polymer. The density of this low density ethylene polymer is 0.910 to 0.935 g.
/ Cm ³ is preferable, and specifically, an ethylene homopolymer obtained by a high-pressure polymerization method, ethylene and an α-olefin for adjusting the density, for example, propylene, butene-1,
The copolymer with pentene-1 is mentioned. The low-density ethylene polymer may be in the form of pellets having a particle size of 1 to 5 mm or powder. It is preferable to properly use these depending on the blending ratio of the low density ethylene polymer in the grafting precursor. For example, when the low-density ethylene polymer in the grafting precursor is 50% by weight or more, it is preferably in the pellet form, and when it is less than 50% by weight, the powder form is preferable. Specific examples of the aromatic vinyl monomer include styrene, methylstyrene, ethylstyrene, dimethylstyrene, isopropylstyrene, chlorostyrene, α-methylstyrene and α-ethylstyrene. The number average molecular weight of the above polymer is 10,000 to 200,000 for the former and 20,000 to 15 for the latter.
Many are suitable. These are commercially available under the trade name of Modeper. In this graft polymer, the ratio of the ethylene-based polymer and the polymer of the aromatic vinyl compound to be grafted is not particularly limited, but the ethylene-based polymer ratio is preferably 15 to 85% by weight, and preferably 25 to 85% by weight.
70 weight percent is more preferably used. Considering the compatibility, 30 to 50 weight percent is the most preferable.

The polymer of the unsaturated carboxylic acid or its derivative (E) used in the present invention is a non-aromatic carbon-carbon double bond or triple bond and one or more carboxyl groups in the molecule. Is a compound in which a functional compound having a group derived from a carboxyl group is used as a monomer and the unsaturated bond is cleaved to form a polymer. Specific examples of the monomer, acrylic acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, maleic anhydride, fumaric anhydride, itaconic anhydride, citraconic acid, aconitic acid, allylmalonic acid, angelic acid, isocrotonic acid. , Α-ethylcrotonic acid, erucic acid, oleic acid,
Allyl formate, glutaconic acid, crotonic acid, 2-chloroacrylic acid, 3-chloroacrylic acid, 2-chlorocrotonic acid, chlorofumaric acid, chloromaleic acid, vinylacetic acid,
Examples thereof include 2-butyric acid, propionic acid, bromofumaric acid, bromomaleic acid, 4-pentenoic acid, mesaconic acid, methacrylic acid, maleic acid amide, maleic acid hydrazide, and polymers having the imide compound as a monomer.
The polymers of unsaturated carboxylic acids or their derivatives include homopolymers thereof, copolymers composed of plural kinds of these, and copolymers of at least one kind selected from these and a vinyl compound of a different kind. . The degree of polymerization is preferably 2 to 200, more preferably 2 to 10. Of these, a homopolymer of itaconic acid is preferable.

In producing the composition of the present invention, it is possible to use a method in which all the raw materials are collectively melted and kneaded. Further, preferably, first, (A) polyphenylene ether resin, (C) ABA type hydrogenated block copolymer,
(D) A graft polymer obtained by kneading an ethylene-based copolymer and an aromatic vinyl monomer, which has a high grafting efficiency and is obtained by graft-polymerizing an aromatic vinyl polymer onto an ethylene-based (co) polymer, ( E) A homopolymer of an unsaturated carboxylic acid or a derivative thereof is melt-kneaded, and then (B) a polyolefin-based polymer obtained by modifying the polyolefin-based polymer with the component (E) is supplied and melt-kneaded. Method of obtaining, or first, (A) polyphenylene ether resin, (C) A
-BA type hydrogenated block copolymer, (D) an ethylene-based (co) polymer having a high grafting efficiency, which is obtained by kneading an ethylene-based copolymer and an aromatic vinyl monomer Graft polymer obtained by graft polymerization of vinyl polymer, (E)
A homopolymer of the unsaturated carboxylic acid or its derivative, and a part (B) of the polyolefin-based polymer of the total amount of the polyolefin-based polymer are melt-kneaded, and then the content of the total amount of the polyolefin-based polymer is adjusted. A method is possible in which the remaining polyolefin resin (B) is preliminarily modified with the component (E) and a stabilizer is supplied and melt kneaded. In melt-kneading, it is also preferable to add 0.05 to 10 parts by weight of a known radical initiator to the total amount of resin.

The resin composition of the present invention may be compounded or added with a substance other than the above-mentioned substances. Examples thereof include binders, other thermoplastic resins, flame retardants, ultraviolet absorbers, lubricants, dyes and pigments, inorganic reinforcing fibers, organic reinforcing fibers, metal fibers, and fillers. Examples of the binder include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, citraconic acid and itaconic acid, and their anhydrides or unsaturated carboxylic acids such as maleic acid amide, malein hydrazide and acrylamide. Acid amides of acids, esters of unsaturated carboxylic acids such as ethyl maleic acid, imides of unsaturated carboxylic acids such as maleimide, unsaturated epoxy compounds such as allyl glycidyl ether, glycidyl acrylate and glycidyl methacrylate, diamines, diepoxys, diols And the like. Other thermoplastic resins include nylon-6, nylon-66, nylon-1.
Polyamides such as 2 and the like, polyamideimides, polyacrylic acid esters such as polymethylmethacrylate, polyvinyl halides such as polyvinyl chloride and polyvinylidene chloride, polystyrene, high impact polystyrene, styrene-butadiene copolymer, styrene- Butadiene-acrylonitrile copolymer, styrene-α-methylstyrene copolymer, styrene-maleic anhydride copolymer,
Examples thereof include polystyrene resins such as styrene-methyl methacrylate copolymer, ethylene-styrene copolymer, and ethylene-propylene-butadiene-styrene copolymer.

As the flame retardant, triphenyl phosphate, tricresyl phosphate, phosphate obtained from a mixture of isopropylphenol and phenols, bifunctional phenol such as benzohydroquinone or bisphenol A and other alcohols or Phosphates such as phosphate obtained from a mixture with phenol, decabromobiphenyl, pentabromotoluene, decabromodiphenyl ether, hexabromobenzene, brominated polystyrene, brominated compounds such as brominated epoxy resin, melamine melamine triisocyanurin Examples thereof include nitrogen-containing compounds such as rate, inorganic substances such as red phosphorus, antimony trioxide, and boron oxide. As the ultraviolet absorber, 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- (3,5-di-t
Examples include -butyl-2-hydroxyphenyl) benzotriazole and 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole. Examples of lubricants include polyethylene wax and paraffin. Examples of inorganic reinforcing fibers include glass fibers, potassium titanate, rock wool, carbon fibers and the like. Above all, ultrafine fibers having a submicron fiber diameter are important for outer panel materials that require good appearance. As an example of the organic fiber, aromatic polyamide fiber,
Examples thereof include aromatic polyester fibers and polybenzimidazole fibers. Examples of metal fibers include copper and SU
Fibers such as S, aluminum and brass can be mentioned.

Specific examples of the filler include glass beads,
Inorganic fillers such as glass flakes, milled glass fibers, wollastonite, mica, talc, clay, calcium carbonate, magnesium hydroxide, silica, diatomaceous earth, metal fillers such as aluminum flakes and zinc flakes, organic fillers such as polyimide powder Agents and the like. The compounding ratio of the above-mentioned substances can be arbitrarily selected according to the purpose, but when a general compounding ratio is exemplified, 100 parts by weight of the total amount of PPE, PO and elastomers is 100 parts by weight of the other thermoplastic resin. Parts by weight or less, the flame retardant is 30 parts by weight or less, the ultraviolet absorber is 0.1 to 20 parts by weight, an inorganic reinforcing fiber,
The organic fiber and the metal fiber are 200 parts by weight or less, and the filler is 100 parts by weight or less.

[0018]

EXAMPLES The present invention will be described more specifically with reference to examples, but the present invention is not limited thereto. PPE of the present invention
The physical properties of the resin composition were confirmed by the following methods. Molding method: PPE resin compositions having the compounding ratios shown in Tables 1 and 2 were mixed in a tumbler type blender for 10 minutes, and melted at a barrel set temperature of 240 to 290 ° C. with a twin screw extruder TEX30 type manufactured by Nippon Steel Co., Ltd. The mixture was kneaded and pelletized. Melt kneading was carried out by the following three methods. Melt-kneading-1 All the raw materials were simultaneously charged from the first supply port of the twin-screw extruder and melt-kneaded. Melt kneading-2 Components A, C-1, C-2, D, and E are charged from the first supply port, and a predetermined amount of the modified polyolefin obtained by previously modifying the component B with the component E and a stabilizer are supplied to the second supply port. It was further charged and melt-kneaded. Melt-kneading-3 Component A, C-1, C-2, D, E and half of the total blending amount of polyolefin of component B are charged from the first supply port, and component B is added.
The remaining half of the above was charged with the modified polyolefin previously modified with the component E and the stabilizer through the second supply port and melt-kneaded. After drying the obtained pellets at 90 ° C. for 5 hours, the molding temperature 2
A test piece for measuring physical properties was molded with a molding machine having a mold clamping pressure of 50 tons at 80 ° C. The physical properties were measured by the following methods. Physical property measurement method Izod impact value: measured according to ASTM D-256 at a thickness of 1/8 "and a notched temperature of 23 ° C. (Kg.
cm / cm) DTUL: Thickness 1 / according to ASTM D-648
At Japan Steel Works J100SAII-formers,: 4 ', was measured under a load 18.6Kg / cm ² (℃) flow length.
Cylinder temperature 290 ℃, injection pressure 1000Kg / c
m ² , thickness 2 mm, width 20 mm bar flow length (mm)
Was measured. Chemical resistance test: A tensile test piece conforming to ASTM was used to obtain a strain rate of 0.
A gauze impregnated with a kerosene wax remover (YUSIRO, ST-7) was applied with a stress of 48%, and the evaluation was made by the occurrence of cracks on the sample surface after 72 hours. ◯: No change x: Breakage of sample due to crack

Example 1 PPE (Mitsubishi Gas Chemical Co., Inc.)
Manufactured, 25 ° C. in chloroform, intrinsic viscosity 0.45) 55
Parts by weight, polypropylene resin (K-40 manufactured by Chisso Corporation)
17) 35 parts by weight, hydrogenated SEBS (manufactured by Shell Co., trade name: Clayton G1651) 10 parts by weight, itaconic acid polymer 0.5 parts by weight, as a stabilizer, manufactured by Sumitomo Chemical Co., Ltd.,
Brand name Sumilizer BHT 0.1 part by weight, SANDOZ
(Trade name) Sand Starve P-EPQ (0.1 part by weight) and calcium stearate (0.1 part by weight) were mixed, and a test sample was prepared under the condition of melt kneading-1.

Example 2: 45 parts by weight of PPE in Example 1,
Same as Example 1 except that 45 parts by weight of polypropylene resin was blended.

Example 3: Half of the polypropylene resin used in Example 2 was used as a modified polypropylene resin previously modified with an itaconic acid polymer, and this was mixed with stabilizers-1 and -2 by the method of melt kneading-2. Pellets were made. The modified polypropylene resin is prepared by mixing 3 parts by weight of an itaconic acid polymer and 1 part by weight of dicumylperoxide as a radical initiator with respect to 100 parts by weight of the polypropylene resin.
It was obtained by melt-kneading with a twin-screw extruder at a cylinder temperature of 240 ° C.

Example 4: The whole amount of the polypropylene resin used in Example 2 was modified polypropylene which was previously modified with an itaconic acid polymer, and this was mixed with stabilizers -1 and -2, and pelletized by the method of melt kneading -3. It was created.

Example 5: The same procedure as in Example 2 was repeated except that a maleic anhydride polymer was used in place of the itaconic acid polymer in Example 2 and 1 part by weight of the radical initiator dicumyl peroxide was added. Pellets were prepared by kneading-1.

Comparative Example 1: Pellets were prepared by the method of melt kneading-1 without adding the itaconic acid polymer in Example 2.

Comparative Example 2: Pellets were prepared by melt kneading-1 in the same manner as in Example 2 except that itaconic acid was used instead of the itaconic acid polymer in Example 2.

Comparative Example 3: Pellets were prepared by melt-kneading-1 in the same manner as in Example 2 except that maleic anhydride was used in place of the itaconic acid polymer in Example 2.

Comparative Example 4: 40 parts by weight of PPE resin, 45 parts by weight of polystyrene resin (manufactured by Mitsubishi Kasei Polytech Co., Ltd., trade name Dialex HT478), hydrogenated SEPS (trade name Septon 2104, 4055 manufactured by Kuraray Co., Ltd.) 5 parts by weight, LDPE-g-PS (NOF Corporation)
Manufactured by Sumitomo Chemical Co., Ltd., Sumilizer BHT0.2 and SA.
Sand stub P-EPQ0 manufactured by NDOZ Co., Ltd. and 2 parts by weight were blended to prepare pellets by melt kneading-1.

Symbols representing each component in the table will be described below. A) PPE resin (Mitsubishi Gas Chemical Co., Ltd., limiting viscosity 0.45 dl / g in chloroform at 25 ° C.) B-1) Polypropylene resin, Chisso Corp., trade name K-4017 B-2) B -1) is modified with an itaconic acid polymer C-1) Hydrogenated SEBS (Clayton G1651) C-2) Hydrogenated SEPS (Septon 2104) C-3) Hydrogenated SEPS (Septon 4055) D) LDPE-g-PS (Modiper A1101) E-1) Itaconic acid polymer, degree of polymerization n = 50 to 100 E-2) Homopolymer of maleic anhydride, degree of polymerization n = 5
-10 E-3) Itaconic acid E-4) Maleic anhydride S-1) Sumilizer BHT S-2) Sand starve P-EPQ S-3) Calcium stearate

[0029]

Ingredients Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 A 55 45 45 45 45 45 45 B-1 35 45 22.5 0 45 40 B-2 0 0 22.5 45 0 0 C-1 10 10 10 10 10 10 0 C-2 0 0 0 0 0 5 C-3 0 0 0 0 0 0 5 5 D 0 0 0 0 0 5 5 E-1 1.5 1.5 1.0 0.8 0 1 E-2 0 0 0 0 1.5 0

[0030]

Table 2 Components Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 A 45 45 45 40 40 B-1 45 45 45 45 C-1 10 10 10 0 C-2 0 0 0 5 C-3 0 0 0 5 D 0 0 0 5 E-3 0 1.8 0 0 E-4 0 0 1.5 0 S-1 0.1 0.1 0.1 0.1 S-2 0.1 0.1 0.1 0.2 S-3 0.05 0.05 0.05 0

[0031]

[Table 3] Test items Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Izod 15 10 30 35 35 15 20 Specific gravity 0.99 0.97 0.97 0.97 0.97 0.98 Bar flow chemical resistance ○ ○ ○ ○ ○ ○ DTUL 138 131 130 133 125 125

[0032]

[Table 4] Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Izod 2 12 10 25 Specific gravity 0.97 0.97 0.97 1.06 Bar flow-290 295 235 DTUL 130 130 130 130 120 Chemical resistance- ○ × ×

[0033]

The resin composition obtained by the present invention has a good balance of physical properties such as fluidity, heat resistance, impact resistance and chemical resistance, and has a specific gravity of 1 or less, which is higher than that of general engineering plastics. It is a lightweight product, and its industrial value is extremely high.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number in the agency FI technical display location C08L 51:06 33:02 35:00) (72) Inventor Shinya Miya 5 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Chome 6-2 Sanryo Gas Chemical Co., Ltd. Plastics Center

Claims (6)

[Claims] 1. A polyphenylene ether resin (A) 5 to
90 parts by weight, 10 to 95 parts by weight of (B) olefin polymer, (C) (C-1) ABA type hydrogenated block copolymer (A is a block of an alkenyl aromatic compound, B is a diene) (A polymer block of a hydrocarbon-based compound) and the content of A exceeds 50% by weight (C
-2) ABA type hydrogenated block copolymer (A is a polymer block of an alkenyl aromatic compound, B is a polymer block of a diene hydrocarbon compound), and the content of A is 50% by weight. 10 to 20 parts by weight of at least one ABA type hydrogenated block copolymer selected from the group consisting of: (D) an ethylene copolymer and an aromatic vinyl monomer; 0 to 20 parts by weight of a graft polymer obtained by kneading, which has a high graft efficiency and is obtained by graft-polymerizing an aromatic vinyl polymer onto an ethylene (co) polymer, (E)
Polymer of unsaturated carboxylic acid or its derivative 0.05 to 2
A resin composition consisting of 0 parts by weight. 2. The resin composition according to claim 1, wherein the polymer of the unsaturated carboxylic acid or its derivative (E) is an itaconic acid polymer. 3. The resin composition according to claim 1, which is obtained by melting and kneading all the raw materials at once in the production of the composition. 4. In producing the resin composition, first, (A) polyphenylene ether resin and (C) AB-
A-type hydrogenated block copolymer, (D) ethylene-based (co) polymer and aromatic vinyl polymer obtained by kneading ethylene-based copolymer and aromatic vinyl monomer A graft polymer obtained by graft polymerization of (E), a homopolymer of (E) an unsaturated carboxylic acid or a derivative thereof, is melt-kneaded,
2. The resin composition according to claim 1, wherein the modified polyolefin polymer obtained by modifying the polyolefin polymer (B) with the component (E) is then supplied and melt-kneaded. 5. In producing the resin composition, first, (A) polyphenylene ether resin and (C) AB-
A-type hydrogenated block copolymer, (D) ethylene-based (co) polymer and aromatic vinyl polymer obtained by kneading ethylene-based copolymer and aromatic vinyl monomer A graft polymer obtained by graft polymerization of (B), a homopolymer of (E) an unsaturated carboxylic acid or a derivative thereof, and a part (B) of a polyolefin-based polymer in a blending amount of all the polyolefin-based polymers are melt-kneaded. After that, a modified polyolefin-based polymer obtained by previously modifying the (B) polyolefin-based polymer with the remaining amount of the total amount of the polyolefin-based polymer compounded with the component (E), and a stabilizer are supplied and melt-kneaded to obtain. The resin composition according to claim 1, wherein the resin composition is obtained. 6. The resin composition according to any one of claims 3 to 5, wherein 0.05 to 10 parts by weight of a radical initiator is added to the total amount of resin in the melt-kneading.