JPH0784543B2 - Resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermoplastic resin composition which can be used as a molded product, a sheet or the like by injection molding, extrusion molding, blow molding or the like. More specifically, mechanically prepared by blending an oxygen-containing hydrocarbon compound having an oxirane ring structure with a polyolefin, a polyphenylene ether resin, a copolymer having both an alkenyl aromatic compound polymerization chain and an aliphatic hydrocarbon chain in the same molecule. The present invention relates to a novel thermoplastic resin composition excellent in physical property balance and molding processability.

(Prior art) Polyolefin has been widely used in various molded products, films, sheets, etc. since it has excellent processability, toughness, water resistance, organic solvent resistance, chemical resistance, etc., and has low specific gravity and is inexpensive. Has been done.

However, polyolefins are not so high in heat resistance and rigidity, and it is desirable to further improve these in order to develop new applications.

On the other hand, polyphenylene ether resin has excellent heat resistance,
Although it has rigidity, its use range is limited because of its drawbacks in moldability and solvent resistance. These are blended with styrenic resins for the purpose of improving their moldability, impact strength, etc., but they are used, but they have drawbacks in solvent resistance,
There is a limit to its range of use, and it is not suitable for fields requiring resistance to oily solvents such as gasoline containers.

Combining the respective advantages of these polyolefins and polyphenylene ethers, various blend compositions have been proposed for the purpose of compensating for the drawbacks. For example, compositions aiming at improving processability and tensile strength (Japanese Patent Publication No. 42-7069). However, the relatively high mechanical strength level required in the industrial field cannot always be satisfied. Further, for the purpose of further improving the compatibility between the polyolefin and the polyphenylene ether resin and improving the mechanical strength, for example, a block copolymer of styrene and butadiene or a composition containing a hydrogenated product thereof ( JP-A-53-71158, JP-A-54-88960, JP-A-59-100159 and the like), and a composition obtained by adding an inorganic filler to these components (JP-A-58-103556). ) Etc. have been proposed. According to these, molding processability and mechanical strength can be improved, but the polyolefin content is small, or the matrix (continuous phase) is composed of a polyphenylene ether resin or a combination thereof with a styrene resin, so that the polyolefin The organic solvent resistance of is not fully exhibited. Further, a polyphenylene ether resin is mixed with a large amount of polyolefin of more than 20% by weight, and as a compound having a compatibilizing action, a diblock copolymer or a radial tereblock copolymer composed of an alkenyl aromatic compound and a conjugated diene, and Compositions (JP-A-58-103557 and JP-A-60-76547) to which these hydrogenated polymers are added have been proposed, and melt processability, tensile properties, brittleness, etc. can be improved. However, the mechanical properties balance such as a relatively high level of rigidity and impact strength required in the industrial field is not necessarily satisfied.

(Problems to be Solved by the Invention) The present invention is a polyolefin having sufficient organic solvent resistance, high mechanical property balance, and moldability by developing a new compound in view of the above-mentioned situation. And to obtain a resin composition containing a polyphenylene ether resin.

(Means for Solving the Problem) In order to make up for and improve the insufficient mechanical properties of conventional polyolefin-polyphenylene ether blends, the present inventors have investigated various polyolefins, polyphenylene ether resins and various blends. As a result of investigating the components, a polymer having both an alkenyl aromatic compound chain and an aliphatic hydrocarbon chain in the same molecule and an oxygen-containing hydrocarbon compound having at least one oxirane ring structure in the same molecule are blended. As a result, it was found that an excellent balance of mechanical properties centering on impact strength can be obtained, and the present invention was completed.

Therefore, the composition according to the present invention comprises: (a) 20 to 75% by weight of a polyolefin selected from the group consisting of homopolymers or copolymers of α-olefins; (b) 20 to 75% by weight of a polyphenylene ether resin; e) Polymer 4 having both alkenyl aromatic compound polymerization chain (c) and aliphatic hydrocarbon chain (d) in the same molecule
Of 40 to 40% by weight of the total amount of the polymer, and (f) 0.05 to 10 parts by weight of an oxygen-containing hydrocarbon compound having at least one oxirane ring structure in the same molecule. It is a resin composition.

According to the present invention, a resin composition having a high level of impact strength, a good level of rigidity, moldability, and organic solvent resistance can be obtained, as compared with a resin composition containing a conventional polyolefin and a polyphenylene ether resin. .

(Detailed Description of the Invention) 1. Constituent Components (1) Polyolefin (a) The polyolefin used in the present invention is ethylene, propylene, butene-1-, bentene-1, hexene-1,
It is a homopolymer or intercopolymer of α-olefins such as 3-methylbutene-1, 4-methylpentene-1, heptene-1, and octene, and at least partially exhibits crystallinity.

Of these, homopolymers of propylene, butene-1, 3-methylbutene-1, 4-methylpentene-1 or their mutual copolymers are preferable, and among them, crystalline propylene-based polymer, that is, crystalline propylene homopolymer. Coalesced, crystalline propylene-ethylene block and random copolymer, or α-olefin rubber containing ethylene and a majority of these crystalline propylene-based polymers, that is, α-olefin containing plural ethylene, and in some cases small amount of A mixture with a rubbery copolymer containing a non-conjugated diene is preferable in terms of balance of mechanical properties.

These crystalline propylene-based polymers and these and α-
Melt flow rate of mixture with olefin rubber (MF
R) (230 ° C, load 2.16kg) is preferably 0.01-150g / 1
The range of 0 minutes, more preferably 0.05 to 70 g / 10 minutes, and most preferably 0.1 to 50 g / 10 minutes. In the range where the MFR value is higher than this, the level of mechanical property balance is low,
Further, in a range lower than this, mechanical molding processability becomes difficult, which is not preferable.

Among these, those having a higher molecular weight and having a molecular weight change caused by a heat treatment in the presence of a radical generator such as an organic peroxide to be in the MFR range are also included.

(2) Polyphenylene ether resin (b) The polyphenylene ether used in the present invention has the general formula In the formula, the ether oxygen atom of one unit is connected to the benzene nucleus of the next adjacent unit, n is at least 30, Q is independently hydrogen, halogen, Hydrocarbon groups containing no tertiary α carbon atoms, halohydrocarbon groups having at least 2 carbon atoms between a halogen atom and a phenyl nucleus, hydrocarbon oxy groups and at least 2 between a halogen atom and a phenyl nucleus.
Represents a monovalent substituent selected from the group consisting of halohydrocarbonoxy groups having 4 carbon atoms.

As typical examples of polyphenylene ether, poly (2,6-dimethyl-1,4-phenylene) ether, poly (2,6-diethyl-1,4-phenylene) ether, poly (2-methyl-6- Ethyl-1,4-phenylene) ether, poly (2-methyl-6-propyl-1,4-phenylene) ether, poly (2,6-dipropyl-1,4-phenylene) ether, poly (2-ethyl- 6-propyl-1,4
-Phenylene) ether, poly (2,6-dibutyl-1,4-
Phenylene) ether, poly (2,6-dipropenyl-1,4
-Phenylene) ether, poly (2,6-dilauryl-1,4
-Phenylene) ether, poly (2,6-diphenyl-1,4
-Phenylene) ether, poly (2,6-dimethoxy-1,4
-Phenylene) ether, poly (2,6-diethoxy-1,4
-Phenylene) ether, poly (2-methoxy-6-ethoxy-1,4-phenylene) ether, poly (2-ethyl-6-stearyloxy-1,4-phenylene) ether, poly (2,6-dichloro-) 1,4-phenylene) ether, poly (2-methyl-6-phenyl-1,4-phenylene) ether, poly (2,6-dibenzyl-1,4-phenylene) ether, poly (2-ethoxy-1, 4-phenylene) ether, poly (2-chloro-1,4-phenylene),
Poly (2,5-dibromo-1,4-phenylene) ether and equivalents.

Also, a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol, 2,6-dimethylphenol and 2,3,5,6
There may also be mentioned copolymers of tetramethylphenol and copolymers of 2,6-diethylphenol and 2,3,6-trimethylphenol.

Further, the polyphenylene ether used in the present invention is
It also includes modified polyphenylene ethers such as those obtained by grafting a styrenic monomer (for example, styrene, p-methylstyrene, α-methylstyrene, etc.) onto the polyphenylene ether defined by the above general formula.

A method for producing a polyphenylene ether corresponding to the above is known, for example, U.S. Pat.Nos. 3306874, 3306875,
No. 3257357 and No. 3257358, and Japanese Patent Publication No. 52-17880 and Japanese Patent Laid-Open No. 50-51197.

A preferred group of polyphenylene ethers for the purposes of the present invention are those having alkyl substituents at the two ortho positions relative to the ether oxygen atom and copolymers of 2,6-dialkylphenol and 2,3,6-trialkylphenol. is there.

Of these, a polymer of 2,6-dimethylphenol is particularly preferable. Further, the range of the preferable molecular weight is 0.15 to 0.70 dl / g in the range of the value of the intrinsic viscosity measured by using 30 ° C. chloroform as its scale.
More preferably 0.2 to 0.65 dl / g, even more preferably 0.4 to 0.
6dl / g range, particularly preferably 0.45-0.58dl / g
It is in the range of g.

In the range of less than 0.15 dl / g, the mechanical strength of the composition is low, and in the range of more than 0.7 dl / g, the moldability of the composition decreases, which is not preferable.

The above polyphenylene ether resin may be a mixture of polyphenylene ether and a styrene resin in a range not exceeding half.

(3) Polymer having both alkenyl aromatic compound polymerization chain (c) and aliphatic hydrocarbon chain (d) in the same molecular chain (e) Alkenyl aromatic compound polymerization chain used in the present invention (C) [Hereinafter, referred to as chain (c). ]
And an aliphatic hydrocarbon chain (d) [hereinafter referred to as chain (d). And a polymer (e) [hereinafter, polymer (e)]
Called. ], In the same polymer chain constituting the polymer, at least partially and at least one of a polymerization chain portion of an alkenyl aromatic compound and a portion forming a polymerization chain form of an aliphatic hydrocarbon. A polymer composed of a polymer chain having two chains, each of which has at least one chain (c) and at least one chain (d) linearly bonded to each other, a so-called linear block structure or a so-called radial teleblock structure, which has one It includes a trunk and a so-called graft-like branched structure having other branches.

The alkenyl aromatic compound forming the chain (c) has a chemical structure represented by the following general formula.

In the formula, R ¹ and R ² are selected from the group consisting of hydrogen and a lower alkyl group or alkenyl group having 1 to 6 carbon atoms, and R ³ and R ⁴
Is hydrogen, a lower alkyl group having 1 to 6 carbon atoms, chlorine or bromine, and R ⁵ , R ⁶ and R ⁷ are hydrogen and 1 carbon atom.
Selected from the group consisting of lower alkyl groups and alkenyl groups of ~ 6, or R ⁶ and R ⁷ may form part of an aromatic ring to form a naphthyl group.

Specific examples of alkenyl aromatic compounds include styrene, paramethylstyrene, α-methylstyrene, vinylxylene, vinyltoluene, vinylnaphthalene, divinylbenzene, bromostyrene and chlorostyrene, and combinations thereof. Among these, styrene, α-methylstyrene, paramethylstyrene, vinyltoluene and vinylxylene are preferable, and styrene is more preferable.

The chain (c) may contain a copolymerization component other than the alkenyl aromatic in an amount not exceeding 25% by weight, based on the weight of 100% by weight.

The chain (d) is a hydrocarbon chain mainly composed of a saturated aliphatic hydrocarbon, and specifically, a known carbon-carbon unsaturated bond of a polymer chain of olefins or a polymer of conjugated dienes. Those having a structure similar to or similar to the polymer chain of olefins by being saturated by a hydrogenation treatment method are included. The chain (d) may partially contain a carbon-carbon unsaturated bond, a cross-linked structure, or a branched structure, and the total weight of the chain (d) is 100% by weight and does not exceed 25% by weight. As the other copolymerization component, a component derived from a monomer containing a hetero atom such as oxygen, nitrogen, sulfur, silicon, phosphorus and halogen and an alkenyl aromatic compound may be contained in a block, random or graft form. Examples of the monomer containing a hetero atom include maleic anhydride and its derivatives, acrylic acid and its derivatives, vinyl chloride and the like.

The proportion of the chain (c) in the polymer (e) is preferably in the range of 20 to 75% by weight, with the total weight of the polymer (e) being 100% by weight, and the proportion of the chain (d) is 25 to 80%. A weight% range is preferred. The polymer (e) may include a chain (c) and a polymer chain other than the chain (c) in a range not exceeding the majority of the chain, and the polymer chain is a branched chain. It may form part of a trunk, branch or block-like chain. Further, it may contain a polyfunctional hydrocarbon group or a heteroatom or a polyfunctional hydrocarbon group containing a heteroatom at a branch point of a branched structure or a radial teleblock structure. Further, the polymer (e) is more preferable as long as it has rubber-like properties.

Specific examples of the polymer (e) include olefins, that is,
Included in the scope of the present invention is a graft copolymer, block copolymer, etc. of the olefin described in 1. Component (1) Polyolefin (a) and an alkenyl aromatic compound such as water lily. Polystyrene-grafted ethylene-propylene rubber, polystyrene-grafted ethylene-propylene-diene rubber, ethylene-styrene block copolymer, propylene-styrene block copolymer, block copolymer or alkenyl aromatic compound and the following conjugated diene , Partially hydrogenated products of graft copolymers of alkenyl aromatic compounds for conjugated diene polymer rubbers and polypentenamers, etc.,
Among these, the partially hydrogenated alkenyl aromatic compound-conjugated diene block copolymer is more preferable.

Specific examples of the above conjugated diene include 1,3-butadiene and 2
-Methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene and the like, among them, 1,3-butadiene, 2-methyl-1,3-butadiene Those selected from the above are preferable. In addition to these conjugated dienes, a small amount of lower olefinic hydrocarbons such as ethylene, propylene and 1-butene, cyclopentadiene and non-conjugated dienes may be contained.

Hereinafter, particularly preferred as the component (e) in the present invention,
The partially hydrogenated alkenyl aromatic compound-conjugated diene block copolymer will be described in more detail. The “partially hydrogenated alkenyl aromatic compound-conjugated diene block copolymer” has at least one chain block “A” derived from an alkenyl aromatic compound and at least one chain block “B” derived from a conjugated diene. It is a block copolymer of the alkenyl aromatic compound-conjugated diene block copolymer having a structure, in which the aliphatic unsaturated groups of block B are reduced by hydrogenation. The arrangement of blocks A and B includes those having a linear structure or those having a branched structure, that is, a so-called radial teleblock structure. Further, a part of these structures may include a random chain derived from the random copolymerization part of the alkenyl aromatic compound and the conjugated diene. On these,
Those having a linear structure are preferred.

In the partially hydrogenated alkenyl aromatic compound-conjugated diene block copolymer, the proportion of repeating units derived from the alkenyl aromatic compound is 20 to 75% by weight.
Is preferable, and a range of 25 to 65% by weight is more preferable. If it is less than this range, the rigidity level of the composition is low, and if it is more than this range, the impact strength level of the composition is low and the object of the present invention cannot be achieved.
Of the aliphatic chain moieties in these block copolymers,
The proportion of unsaturated bonds remaining without being hydrogenated is preferably 20% or less, more preferably 10% or less. In addition, about 25% of aromatic unsaturated bonds derived from alkenyl aromatic compounds
The following may be hydrogenated.

These hydrogenated block copolymers (e) have a toluene solution viscosity value at 25 ° C of 3,000 to 30 cps (concentration 15% by weight) or 10,000 to
Those in the range of 50 cps (concentration 20% by weight) are preferable.

Many methods have been proposed as a method for producing an alkenyl aromatic compound-conjugated diene block copolymer.
Typical methods include, for example, the methods described in Japanese Examined Patent Publication No. 40-23798, U.S. Pat.Nos. 3,5959,942 and 4,090,996, and the like, which are used in an inert solvent using a lithium catalyst or a Ziegler type catalyst. Block copolymerization is carried out.

The hydrogenation treatment of these block copolymers is carried out by hydrogenation in an inert solvent, for example, by the method described in each publication such as JP-B-42-8704, 43-6636 or 46-20814. It is carried out by hydrogenation in the presence of an added catalyst. In this hydrogenation, at least 50%, preferably 80% of the olefinic double bonds in polymer block B are
The above is hydrogenated, and 25% or less of the aromatic unsaturated bonds in the polymer block A are hydrogenated. One such hydrogenated block copolymer is commercially available under the trade name "KRATON-G" from Ciel Chemical Company. In addition, the Journal of Polymer Scienc
e) According to the method described in the literature such as Part B Letters Volume 11, pages 427 to 434 (1973), hydrogenation can be carried out using p-toluenesulfonyl hydrazide in an inert solvent. .

(4) Oxygen-containing hydrocarbon compound having at least one oxirane ring structure in the same molecule (f) Oxygen-containing hydrocarbon compound having at least one oxirane ring structure in the same molecule (f) used in the present invention
[Abbreviated as compound (f) below] is represented by the following general formula.

Here, R ¹ is a hydrocarbon group having 4 to 40 carbon atoms, and a group containing a cyclic structure, a carbon-carbon unsaturated group, an oxygen atom, a sulfur atom, a nitrogen atom, and a silicon atom in its structure. For example, it may contain an ether group, a thioether group, an ester group, an amino group, an amide group, a ketone group, a silyl ether group, or a halogen atom, and those atoms other than carbon are bonded to X. May be.

R ² , R ³ and R ⁴ include a hydrogen atom or a group containing a hydrocarbon group having 1 to 30 carbon atoms, including a hetero atom such as oxygen or sulfur in the structure, or a group having an unsaturated bond. .

X ^{is, - (CR 5 R 6)} n- ( wherein, R ⁵ and R ⁶ are a hydrogen atom, a linear or branched in the range of a single prime 1-6 represents a cyclic hydrocarbon group, and R ¹ R ^{5 s} may be the same or different and may form the same ring, and n represents a positive integer in the range of 1 to 4).

Specific examples of these compounds (f) include stearyl glycidyl ether, cetyl glycidyl ether, lauryl glycidyl ether, behenyl glycidyl ether,
Glycidyl ethers such as erucyl glycidyl ether; glycidyl esters such as glycidyl erucinate, glycidyl behenate, glycidyl stearate, glycidyl cetane, and glycidyl laurate; partial epoxidized unsaturated fats and oils such as soybean oil and linseed oil; Olefin epoxidized products such as 1-eicosene oxyside, 1-octadecene oxide, 1-hexadecene oxide; glycidyl methacrylate graft products of polyolefin oligomers, alkyl glycidyl maleate graft products of polyolefin oligomers, alkyl-substituted phenyl glycidyl ethers, etc. Can be mentioned. Among these, alkyl glycidyl ethers are particularly preferable, and behenyl glycidyl ether, stearyl glycidyl ether, cetyl glycidyl ether, tetradecyl glycidyl ether, lauryl glycidyl ether and the like are particularly preferable.

These may be a mixture and may contain impurities such as unreacted raw materials at the time of synthesis as long as the effects of the present invention are not significantly impaired.

These are commercially available, can be synthesized by known methods, and can be used.

2. Composition Ratio of Constituents The proportion of polyolefine (a) in the resin composition according to the present invention is as follows: polyolefin (a), polyphenylene ether resin (b), and alkenyl aromatic compound chain (c) in the same molecule. In the total 100% by weight of the polymer component consisting of the polymer (e) having the aliphatic hydrocarbon chain (d) together, the range of 20 to 75% by weight is preferable, and the range of 28 to 60
The range by weight is more preferable, and the range from 32 to 50% by weight is particularly preferable. If it is less than 20% by weight, the organic solvent resistance is not sufficient, and if it exceeds 75% by weight, the rigidity level becomes low and the object of the present invention cannot be achieved, which is not preferable.

Similarly, the proportion of the polyphenylene ether resin (b) in the resin composition according to the present invention is 100% in total of the polymer components.
The preferred range is 20 to 75% by weight, 30 to 65% by weight.
A range of weight% is more preferable. Especially, the range of 35 to 58% by weight is preferable. If it is less than 20% by weight, the rigidity and heat resistance are not sufficient, and if it exceeds 75% by weight, the solvent resistance becomes poor, which is not preferable. Similarly, the proportion of the polymer (e) having both the alkenyl aromatic compound polymerization chain (c) and the aliphatic hydrocarbon chain (d) in the same molecular chain is 4 to 40 in the total 100% by weight of the polymer components. A weight% range is preferred,
A range of 7 to 30% by weight is more preferable, and a range of 10 to 25% by weight is particularly preferable. If it is less than 4% by weight, the impact strength level is not sufficient, and if it exceeds 40% by weight, the rigidity level is low.
It is not preferable because the object of the present invention cannot be achieved.

The proportion of the compound (f) having at least one oxirane ring structure in the same molecule in the resin composition according to the present invention is such that the total amount of the polymer components is 100 parts by weight and the amount added as an external number is from 0.05 to 10. The range is preferably from 0.5 to 7 parts by weight, more preferably from 1 to 5 parts by weight. If it is less than 0.05 parts by weight, the effect of improving the impact strength is not sufficient, and if it exceeds 10 parts by weight, the rigidity and impact strength levels are poor and the surface of the molded product tends to become sticky, which is not preferable.

The resin composition according to the present invention is a thermoplastic or thermosetting resin other than the above polymer component, a rubber component other than the polymer (e), and an antioxidant, if necessary, within a range that does not impair the object of the present invention. , Weather resistance improvers, nucleating agents, slip agents, inorganic or organic fillers and reinforcing agents, flame retardants, various colorants, antistatic agents, release agents, small amount of radical generators for controlling the molecular weight of polyolefins. Ingredients such as (organic peroxides, azo compounds, organic tin compounds) can also be added.

3. Blending method As a blending method for obtaining the resin composition according to the present invention, there are generally used resin or resin and a stabilizer or colorant,
Further, various methods of blending a resin and a filler can be applied. For example, powdery or granular components are uniformly dispersed by a Henschel mixer, super mixer, ribbon blender, V blender, etc., and then a twin-screw kneading extruder, a single-screw kneading extruder, a roll, a Banbury mixer, Melt kneading can be performed using a plastomill, a Brabender plastograph, or the like. The melt-kneading temperature is usually in the range of 200 ° C to 350 ° C.

The resin composition obtained as described above can be extruded into pellets after melt-kneading.

4. Application of the resin composition according to the present invention The resin composition according to the present invention can be easily shaped by a molding method generally applied to thermoplastic resins, that is, injection molding, extrusion molding, blow molding, etc. Injection molding is the most preferable although it can be easily molded by molding. Since it has good mechanical properties, it is suitable for parts such as automobile interior and exterior parts, electrical equipment exterior parts, and so-called office automation equipment.

(Example) 1. Description of each component 1) Polyolefin (a) A polypropylene homopolymer and a propylene-ethylene block copolymer sold by Mitsubishi Petrochemical Co., Ltd. were used. The melt flow rate (MFR) and ethylene content of each are shown in the table. In addition,
MFR was measured according to JIS K7210-1975, and the ethylene component content was measured by infrared spectroscopy.

2) Polyphenylene ether resin (b) Poly (2,6-dimethyl-1,4-phenylene) ether, a prototype of Mitsubishi Petrochemical Co., Ltd. (Intrinsic viscosity of 0.50 dl / g measured using chloroform at 30 ° C) )It was used.

3) Polymer having both alkenyl aromatic compound polymerization chain and aliphatic hydrocarbon chain in the same molecule (e) Partially hydrogenated styrene-isoprene block copolymer (trade name) sold by Shell Chemical Co., Ltd. Clayton GX1701, abbreviated as hydrogenated SI-block in Table 1) was used.

4) Oxygen-containing hydrocarbon compound (f) having at least one oxirane ring structure in the same molecule As an example of the compound (f), a glycidyl ether of a higher alcohol having a prime number of about 13 to 15 [trade name YED-111, Manufactured by Yuka Shell Epoxy Co., Ltd.], abbreviations in Table 1 are (f3), commercially available stearyl glycidyl ether (purity about 80%), Table 1
The abbreviation in the table was (f1), a commercially available cetyl-glycidyl ether (purity about 80%), and the abbreviation in the table was (f2). The main component of impurities of the glycidyl ether compound is higher alcohol which is an unreacted raw material.

When kneading each polymer component, as a stabilizer, 4-
Methyl-1,6-di-t-butylphenol was added at 0.2 parts by weight (as an external number relative to 100 parts by weight of the total amount of all polymers).

2. Mixing and kneading the resin composition After thoroughly mixing and stirring the predetermined amounts of the components shown in the table below with a super mixer, using a PCM twin-screw extruder manufactured by Ikegai Tekko KK, set temperature The composition was melt-kneaded at 270 ° C. to obtain a composition, which was then extruded in a strand shape and pelletized by a cutter.

3. Preparation of test pieces for physical property measurement and evaluation In-line screw type injection molding machine, Toshiba Machine Co., Ltd.
Using IS-90B type, cylinder temperature 270 ℃, mold cooling temperature
Injection molding was performed at 60 ° C to prepare a test piece.

4. Measurement and Evaluation Method Each physical property value and various properties in the examples and comparative examples shown below were measured and evaluated under the following conditions.

1) MFR The MFR of polyolefin was measured according to JIS K7210-1975.

The MFR of the composition was measured by a method in which the method according to JIS K7210-1975 was partially modified. The items to be changed were the measurement temperature and the load, and the conditions were 280 ° C and a load of 5 kg.

2) Flexural modulus According to ISO R178-1974 Procedure12 (JIS K7203),
It measured using the Instron tester.

3) Izod impact strength Measured using an Izod impact strength tester manufactured by Toyo Purifying Machinery according to ISO R180-1969 (JIS J7110) (notched Izod impact strength). Measurement ambient temperature is 23 ℃ and −
30 ° C.

4) Drop impact strength Test piece (120mm x 80m) installed on a support (hole diameter 40mm)
m, thickness 2 mm), the load sensor dart was dropped (2 m × 7 kgf), the deformation and fracture behavior of the test piece under impact load was measured, and the impact absorbed up to the crack initiation point in the obtained impact pattern. The energy was calculated and used as the impact strength of the material. The measurement ambient temperature is 23 ° C and -30 ° C.

5) Organic solvent resistance It was measured according to the Bergen 1/4 ellipse method [SPE Journal 667 (1962)]. Specifically, a test piece with a plate thickness of 2 mm is
It was fixed as a quarter elliptic jig with a short axis of 8 cm and immersed in commercially available gasoline for 5 minutes, and was determined as the critical strain of the minimum strain at which cracking occurs. At this time, those with no cracks or those with a critical strain value of 1.5% or more were evaluated as ◯ (good), 1.0 to 1.5% Δ (normal), and less than 1.0% × (poor).

5. Description of Examples and Comparative Examples Table 1 summarizes the types of various components of the composition of the present invention and the comparative composition, and the physical properties of each composition obtained thereby.

As can be seen from Table 1, from Example 1 and Comparative Examples 1 and 2, a partially hydrogenated alkenyl aromatic compound and an oxygen-containing hydrocarbon having at least one oxirane ring structure in the same molecule as constituent components of the resin composition. When the compound is contained, the impact strength of the resin composition containing polyolefin and polyphenylene ether is remarkably high, and the effect of the present invention is clear.

Similarly, in Table 1, by comparing Example 1 with Comparative Example 3, Example 2 with Comparative Example 4, and Example 3 with Comparative Example 5, the oxygen content containing at least one oxirane ring structure in the same molecule is shown. The composition containing a hydrocarbon compound not only has a significantly high impact strength as compared with a composition containing no hydrocarbon compound, but also exhibits almost no change in the rigidity level, and thus exhibits a high level of balance between rigidity and impact strength, and various polyolefins. The same effect can be seen in the above, and the effect of the present invention is clear.

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Claims (1)

[Claims] 1. A polyolefin 20 selected from the group consisting of (a) homopolymers or interpolymers of α-olefins.
To 75% by weight, (b) 20 to 75% by weight of polyphenylene ether resin, (e) Polymer 4 having both alkenyl aromatic compound polymerization chain (c) and aliphatic hydrocarbon chain (d) in the same molecule.
Of 40 to 40% by weight of the total amount of the polymer, and (f) 0.05 to 10 parts by weight of an oxygen-containing hydrocarbon compound having at least one oxirane ring structure in the same molecule. Resin composition.