JPH0247155A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain the title composition improved in flow and impact resistance by mixing a (non)functional polyphenylene with a polyamide, a modified polyolefin and a styrene elastomer. CONSTITUTION:A functional polyphenylene ether having 0.1-6wt.% reactive residues of a compound of formula I [wherein (I) is formula II (wherein X is F, Cl, Br, I, OH, OR or formula III; and R is H, an alkyl or an aryl); X is a bivalent hydrocarbon group; and (II) is a carboxylic acid (ester), an acid anhydride, an acid amide, an imide, an amino or a hydroxy], e.g., trimellitic anhydride chloride, is obtained by reacting said compound with a polyphenylene ether. 20-77wt.% said ether is mixed with 0-50wt.% nonfunctional polyphenylene ether, 20-77wt.% polyamide, 3-20wt.% modified polyolefin having at least one kind of a functional group selected from among carboxyl (metal salt), carboxylic ester, carboxylic acid anhydride and imide groups in the molecule, and 0-20wt.% styrene elastomer.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a thermoplastic resin composition containing a polyphenylene ether resin and a polyamide resin as main components.

BACKGROUND OF THE INVENTION Polyphenylene ether resins are useful as molding materials due to their excellent mechanical and electrical properties;
Solvent resistance is insufficient. In order to improve this point, it has been proposed to mix polyphenylene ether resin and polyamide with good solvent resistance (Japanese Patent Laid-Open No. 58-165
No. 25). However, polyphenylene ether resin and polyamide have poor compatibility, and mixtures thereof do not exhibit the properties originally possessed by both resins, such as good mechanical properties. In order to improve this point, a compound having a specific functional group such as maleic anhydride, linseed oil, liquid polybutadiene, or a liquid diene compound was added as a compatibilizer during melt mixing (Japanese Patent Publication No. 60-11966).
(Japanese Patent Publication No. 61-10494, etc.), polyphenylene ether modified with a specific compound such as maleic anhydride, and then mixed with polyamide (Japanese Patent Publication No. 59-664)
No. 5, JP-A No. 62-257957), etc. are known. Japanese Patent Publication No. 62-500456@ describes a composition of functionalized polyphenylene ether and polyamide.

Problems to be Solved However, as described in the aforementioned Japanese Patent Publications No. 11966/1988 and 10494/1982, there is a method of adding a specific compound such as maleic anhydride when melt-mixing polyphenylene ether and polyamide. In the composition produced by the method, the reaction with polyphenylene ether or polyamide occurs randomly without a specific GMW, which is unfavorable in terms of fluidity and impact resistance. Also, JP-A-596645 and JP-A-62-257957
Even with the method of modifying polyphenylene ether in advance as described in the above issue, the same problem as above occurs because the modification of polyphenylene ether is random and is not performed primarily at the ends.

Therefore, an object of the present invention is to obtain a resin composition containing polyphenylene ether resin and polyamide as main components, which has excellent flowability and impact resistance.

Structure of the Invention The present invention which achieves the above object is (A) general formula (1) % formula % (1) (wherein (I>) is general formula (2) (X-C)... ... (2)
(wherein, is 2
(II) is at least one group selected from a carboxylic acid group, an acid anhydride group, an acid amide group, an imide group, a carboxylic acid ester group, an amino group, or a hydroxy group. . 20 to 77,000% by weight of functionalized polyphenylene ether, which is a reaction product of the compound represented by ) and polyphenylene ether; (B) 0 to 50% by weight of non-functionalized polyphenylene ether; (C) 20 to 77% by weight of polyamide; (0) carboxylic acid group, carboxylic acid metal base, carboxylic ester group,
3 to 20% by weight of a modified polyolefin having at least one functional group selected from carboxylic acid anhydride groups and imide groups in the molecule: and (E) 0 to 20% by weight of styrenic elastomer i.
However, the above weight % is based on the total weight of the resin composition).

Component (A) functionalized polyphenylene ether used in the present invention includes (a) polyphenylene ether, and (b)
It is a reaction product of the general formula % formula % (). Here 7 contains at least 1, typically 1 to 6 carbon atoms. Formula (I>-Z-(
n), preferably the group (I) or J
: and (n) cannot be the same group at the same time. For example, when the group (I) has a carboxylic acid group (Coo)-1)'c, the group (II) does not contain a carbonic acid group. Rather, in this case it is preferred that group (II) is an acid anhydride group. The converse is also true, as long as the group (II> of the compound contains one or more carboxylic acid groups, the group (I) is not -〇〇H. In this case, the group (I) is an acyl chloride. or similar groups are preferred.

In the present invention, suitable compounds of the general formula (I>-Z-(I[)) include chloroethanolsuccinic anhydride, trimellitic anhydride, chloride, chloroformylsuccinic anhydride, OII, 1-acetoxyacetyl-3,4-dibenzoic acid, Examples include, but are not limited to, acid anhydrides.

Numerous molecules containing groups selected from carboxylic vL (including mono- and polycarboxylic acids), acid anhydrides, acid amides, imides, carboxylic esters, amines or hydroxyl groups can react with polyamides, or can meet.

Accordingly, such molecules, such as the acid chloride of terephthalic acid, can be utilized to obtain the functionalized polyphenylene ethers of the present invention.

The amount of the compound of formula (I>-Z-(II) used to functionalize the polyphenylene ether may result in improved properties, particularly improved compatibility as well as improved processing, in the polyphenylene ether-polyamide composition. Formula (I)-Z~ used to react with polyphenylene ether which is the parent that imparts elasticity, impact strength and/or extensibility
The amount of compound (II) is generally less than about 6% by weight based on the polyphenylene ether, preferably from about O,OS to
It is approximately 4% by weight. The optimum amount of compatibilizer to use to achieve the best results for a given composition depends on the type of polyphenylene ether and polyamide to be reacted, and the @n ratio of the polymers and processing conditions.

In the present invention, the polyphenylene ether is known per se, for example, the general formula (A) (wherein R1, R2,
R3 and R4 are hydrogen, halogen, alkyl group, alkoxy group, haloalkyl group and haloalkoxy group having at least two carbon atoms between the halogen atom and the phenyl ring, and do not contain a tertiary α-carbon (indicates a monovalent substituent selected from It may also be a copolymer in which these are combined.

In preferred embodiments, R1 and R2 have 1 to 4 carbon atoms.
is an alkyl group, and R3 and R4 are hydrogen or an alkyl group having 1 to 4 carbon atoms. For example, 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-broby-1,4-phenylene) ether, poly(2,6-diprobyl-1,4-
phenylene) ether, poly(2-ethyl-6-propyl-1,4-phenylene) ether, and the like.

A particularly preferred pop-enylene ether resin is poly(2,
6-dimethyl-1,4-phenylene) ether.

Examples of the polyphenylene ether copolymer include copolymers containing a portion of alkyl trisubstituted phenol, such as 2,3,6-trimethylphenol, in the polyphenylene ether repeating unit. Alternatively, a copolymer in which a styrene compound is grafted onto these polyphenylene ethers may be used. The styrene-based compound-grafted polyphenylene ether is a copolymer obtained by grafting a styrene-based compound such as styrene, α-methylstyrene, vinyl 1-toluene, chlorostyrene, etc. onto the above-mentioned polyphenylene ether.

A particularly preferred group of polyphenylene ethers for the present invention includes C1-
Including those with C4 alkyl substituents. Examples of this group include: 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(2,6-diprobyl-1,4-7enylene) ether: Poly(2-ethyl-6-brobyl-1,4-phenylene) ether, etc., and the most preferred is poly(2,6-dimethyl-1 , 4-phenylene) ether having at least one of the terminal groups of formula (B) and formula (C).

The reaction of polyphenylene ether with a compound of formula (I) is as follows.

Linear polyphenylene ethers having terminal groups of general formula (I), such as trimellitic anhydride acid chloride of formula
>-Z-(II) can be reacted with an acyl compound having >-Z-(II) to form a functionalized polyphenylene ether of formula O.

These can be suitably purified, such as by precipitation in methanol or acetone, and optionally filtered.
May be dried.

In this example, the polyphenylene ether is the group (1) moiety of trimellitic anhydride acid chloride (i.e., C, l
It is clear that the residue is 10-.

The acid anhydride groups in this functionalized polyphenylene ether are understood to have polyamide affinity and participate primarily in chemical or physical association with the polyamide resin.

Compounds having formula (I)-Z-(II) are reacted with polyphenylene ethers to form functionalized polyphenylene ethers. The functionalized polyphenylene ether is made compatible with the polyamide or polyphenylene ether/polyamide composition.

The content of the functionalized polyphenylene ether resin in the thermoplastic composition of the present invention is 20 to 77 m%,
Preferably it is 30 to 70% by weight. If the amount of the functionalized polyphenylene ether resin is less than 20% by weight, sufficient heat resistance will not be achieved, and if it is more than 77% by weight, processability will be poor.

In the present invention, the non-functionalized polyphenylene ether (B), which is an optional component, is a polyphenylene ether that has not been reacted with the compound of the formula (1), and is a polyphenylene ether that is not reacted with the compound of the formula (1).
). Non-functionalized polyphenylene ether is used in amounts up to 50i%. 50% by weight
If the amount is exceeded, the effect of using the functionalized polyphenylene ether will be significantly reduced.

The polyamide resin of component (C) used in the present invention is a polyamide whose main components are an amino acid, a lactam, or a diamine and a dicarboxylic acid.

Specific examples of constituent components include lactams such as ε-caprolactam, enantlactam, and ω-laurolactam;
-aminocaproic acid, 11-aminoundecanoic acid, 12
- Amino acids such as aminododecanoic acid, tetramethylene diamine, hexamethylene diamine, undecamethylene diamine, dodecamethylene diamine, 2,2.4-/2
, 4.4-trimethylhexamethylenediamine, 5-
Methylnonamethylenediamine, m-xylylenediamine, p-xylylenediamine, 1,3-bisaminomethylcyclohexane, 1,4-bisaminomethylcyclohexane, bis-p-aminocyclohexylmethane, bis p
- Diamines such as aminocyclohexylpropane and isophorone diamine, adipic acid, speric acid, azelaic acid, sebacic acid, dodecanoic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid There are dicarboxylic acids such as acids and dimer acids. These constituent components are subjected to polymerization either alone or in the form of a mixture of two or more, and either a polyamide homopolymer or a copolymer obtained in this way can be used in the present invention. In particular, polyamides usefully used in the present invention include polycaproamide (nylon 6), polyhexamethylene adipamide (nylon 66), polyhexamethylene diamine (nylon 6), and polyhexamethylene diamine (nylon 6).
10), polyundecaneamide (nylon 11), polydodecanamide (nylon 12), and copolymers and mixtures of these polyamides. There is no particular restriction on the degree of polymerization of the polyamide used here;
If the relative viscosity of the acid solution at 25°C is, for example, 1.5 to
Any value within the range of 5.0 can be used.

The end groups of these polyamides are typically used for melt viscosity adjustment,
In order to improve thermal stability, terminal blocking etc. are carried out.
The molar ratio of terminal amine groups to terminal carboxyl groups (hereinafter referred to as terminal group ratio) is suppressed to 1 or less. The polyamide used in the present invention preferably has a terminal group ratio of greater than 1.

Such a polyamide can be obtained by adding an extra compound having a group that reacts with a carboxyl group, such as a diamine, during the polymerization of the polyamide. Alternatively, it can also be obtained by polymerizing polyamide and then reacting it with a compound having a group that reacts with a carboxyl group. When a polyamide with an end group ratio of more than 1 is used according to the present invention, the appearance and mechanical strength of the molded article are dramatically improved compared to when a polyamide with an end group ratio of 1 or less is used. This was completely unexpected, and there is currently no definitive theoretical explanation, but electron micrographs of the molded product show that particles of polyphenylene oxide resin dispersed in the polyamide matrix. The diameter is small and uniform. It is surprising that such a significant difference occurs due to the difference in the end group ratio of polyamide. The terminal group ratio is preferably 1.1 or more, more preferably 1.3 or more.

The amount of polyamide blended in the thermoplastic composition of the present invention is 77 to 20% by weight, preferably 70 to 30% by weight. When it exceeds 77% by weight, heat resistance decreases, and 2
If it is less than 0% by weight, processability is poor.

The modified polyolefin of component (D) used in the present invention is ethylene, propylene, butene-1, pentene-1,4-
Methylpentene-1, isobutylene, 1,4-hexadiene, dicyclopentadiene, 2,5-norbornadiene, 5-ethylidenenorbornene, 5-ethyl-2,5
-norbornadiene, 5- (1'-propenyl)-2
- A polyolefin obtained by radical polymerization of at least one olefin selected from norbornene and styrene, containing a carboxylic acid group, a carboxylic ester group, a carboxylic acid metal base, a carboxylic acid anhydride group, and an imide group. a small matrix component having at least one functional group (
This is a modified polyolefin obtained by introducing a functional group-containing component (hereinafter referred to as a functional group-containing component).

Examples of functional group-containing components include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, methylmaleic acid, methylfumaric acid, menaconic acid,
Citraconic acid, glutaconic acid and metal salts of these carboxylic acids, methyl hydrogen maleate, methyl hydrogen itaconate, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, hydroxyethyl acrylate, methyl methacrylate , 2-ethylhexyl methacrylate, hydroxyethyl methacrylate, aminoethyl methacrylate, dimyl maleate,
Dimethyl itaconate, maleic anhydride, itaconic anhydride, citraconic anhydride, endobicyclo-(2,2,1)
-5-heptene-2,3-dicarboxylic acid, endobicyclo-(2,2,1)-5-hebutene-2,3-dicarboxylic anhydride, maleimide, N-ethylmaleimide,
Examples include N-butylmaleimide and N-phenylmaleimide.

The method for introducing these functional group-containing components is not particularly limited, and methods such as mixing with the main component olefins and copolymerizing them, or grafting them into polyolefins using a radical initiator can be used. The amount of the functional group-containing component introduced is o, o relative to the entire modified polyolefin.
A suitable range is oi to 40 mol%, preferably 0.01 to 35 mol%.

Specific examples of modified polyolefins particularly useful in the present invention include ethylene/acrylic acid copolymers, ethylene/methacrylic acid copolymers, and helium, lithium, or Salts with potassium, zinc, and calcium, ethylene/methyl acrylate copolymer, ethylene/ethyl acrylate copolymer, ethylene/methyl methacrylate copolymer, ethylene/ethyl methacrylate copolymer, ethylene/ Ethyl acrylate-〇-maleic anhydride copolymer, (“′q
'' represents a graft (the same applies hereinafter), ethylene/methyl methacrylate-〇-maleic anhydride copolymer, ethylene/ethyl acrylate-〇-maleimide copolymer, ethylene/ethyl acrylate-Cl-N-phenylmaleimide Copolymers and partially saponified products of these copolymers, ethylene/propylene-〇-maleic anhydride copolymer, ethylene/butene-1-Q-maleic anhydride copolymer, ethylene/propylene/1,4- Xadiene-〇-maleic anhydride copolymer, ethylene/propylene/dicyclopentadiene-〇-maleic anhydride copolymer, ethylene/propylene/2,5-norbornadiene-q-maleic anhydride copolymer, ethylene/ Propylene-q-N-phenylmaleimide copolymer, ethylene/butene-1-q-N
Examples include -phenylmaleimide copolymer, styrene/maleic anhydride copolymer, and the like, and each of these can be used alone or in the form of a mixture.

The content of the modified polyolefin in the resin composition of the present invention is within the range of 3 to 20% by weight.

If it is less than 3% by weight, the effect of improving impact resistance will be small, and if it exceeds 20% by weight, heat resistance and rigidity will be impaired, which is not preferable.

The styrenic elastomer as the optional component (E) used in the present invention is a copolymer including random, block and graft copolymers of vinyl aromatic compound conjugated diene. Examples of these materials include A-B-A and A-B
Hydrogenated or non-hydrogenated block copolymers of the type (A is polystyrene and B is an elastomeric diene such as polybutadiene), radial teleblock copolymers of 19 dienes with styrene, acrylic resin modified styrene-butadiene resins, etc. and a graft copolymer obtained by graft copolymerizing a monomer or monomer mixture containing a styrene compound as a main component to a rubber-like polymer.

By blending these styrenic elastomers in the resin composition of the present invention in an amount of 20% by weight or less, physical properties such as impact strength and processability can be further improved. Preferably it is used in an amount of 5 to 15% by weight.

In addition to the above composition components, the resin composition of the present invention can contain a resin that is compatible with polyphenylene ether, such as polystyrene.

The resin composition of the present invention may contain other additives such as pigments, dyes, reinforcing agents, fillers, heat resistant agents, oxidative deterioration inhibitors, weathering agents, and lubricants during resin mixing and molding as long as the physical properties are not impaired. , a mold release agent, a crystal nucleating agent, a plasticizer, a flame retardant, a fluidity improver, an antistatic agent, etc. can be added.

The resin composition of the present invention has excellent fluidity and can be molded by any method such as injection molding, blow molding, or extrusion molding.

Molded products have excellent impact resistance, heat resistance, water resistance, and dimensional stability, and these are especially useful for automobile exteriors such as faders, door panels, quarter panels, bumpers, spoilers, hubcaps, fuel lids, and sight shields. Extremely useful as parts or other general mechanical parts.

There are no particular limitations on the method for producing the resin composition of the present invention, and conventional methods can be used satisfactorily.

However, melt mixing methods are generally preferred. There are no particular restrictions on the temperature and time required for melt mixing, and they can be appropriately determined depending on the composition of the materials.

The temperature varies somewhat with the mixing ratio of polyphenylene ether to polyamide, but is generally within the range of 270-350°C. Although long times and/or high shear rates are desirable for mixing, they result in progressive degradation of the resin composition. Therefore, the time needs to be determined taking these points into consideration.

Any melt mixing method can be used provided it can handle the molten viscous mass. The method may be used batchwise or continuously. Particular examples include extruders, Banbury mixers, rollers, kneaders, etc.

All components may be added directly to the process system or to one polymer. Regarding the other components of the composition, all components may be added directly to the treatment system, or certain additives may be premixed with each other.

EXAMPLES The present invention will be explained in more detail with reference to Examples below.

Examples 1 to 6 and Comparative Examples 1 to 2 (1) In the following Examples and Comparative Examples, poly(2,6-dimethyl-1,4-phenylene) ether produced as follows was used as the non-functionalized polyphenylene ether. there was.

332 parts by weight of toluene, 10 parts by weight of 2.6-xylenol, 4.3 parts by weight of dimethyl-
n-butylamine, 1.0 parts by weight of di-n-butylamine, 0.3 parts by weight of di-tert-butylethylenediamine and 50 parts by weight of cuprous oxide dissolved in 0.8 parts by weight of an aqueous solution of HBr. .08 overlapping parts of the solution were added. Oxygen was bubbled into the stirred solution, during which time 90 parts by weight of 2,6-xylenol were forced into the reactor over a period of 40 minutes. The reaction temperature was maintained at a reaction width of approximately 35° C. while the molecular weight was increasing. Oxygen flow was stopped after approximately 120 minutes. The temperature of the polymer solution was maintained at 50-70'C, during which time the by-product 2,6-dimethyldiphenoquinone was introduced into the polymer and reacted.

Add nitrotriacetic acid to the polymer solution to complex it with the copper catalyst;
Removed by liquid-liquid centrifugation. Before precipitating the polymer with methanol, the solvent was distilled off to concentrate the polymer solution to about a 30 wt% solution. The dried and filtered polymer made in this manner is in the form of a polyphenylene ether powder.

This polyphenylene ether polymer has an intrinsic viscosity of about 0.45 d, Q 2 /g, as measured in chloroform at 25°C.

(2) In the following examples, a functionalized polyphenylene ether prepared as follows was used.

A polyphenylene ether-trimellitic anhydride acid chloride reaction product was made. 100 parts of the poly(2,6-dimethyl-1,4-phenylene) ether (PPE) obtained in (1) dissolved in 500 parts by weight of toluene was added to trimellitic anhydride acid chloride (TAAC>1.
7 to 2.3 parts, and 4.1 to 5 parts as an acid acceptor.
8 parts of dimethyl-n-butylamine (DMBA) was utilized. The reaction was carried out at 95° C. for 0.5-3.0 hours.

TAAC was obtained from Aldrich Chemical with a purity of 99%, a molecular weight of 210.57 g mol, and a melting point of 66-68°C.

The reaction product was purified by precipitation in methanol and then dried overnight in a vacuum oven at 60-80°C.

The formation of PPE-TAAC is associated with a reduction in the known PPE hydroxyl peaks from 2650 to 29000 m and 173
The appearance of a carbonyl absorption peak expressed from 0 to 1740 cm was verified in the infrared spectrum.

(3) The functionalized polyphenylene ether obtained in (2) above was used as component (A).

The non-functionalized polyphenylene ether obtained in (1) above was used as component (B).

As component (C) polyamide, two types of nylon-6
prepared. The first polyamide has =5 8, 4x 10 mol/g of terminal amino groups, 1.8x
It has a terminal carboxyl group of 10'-yl/g. The second polyamide has 4.6X 10' moles/g of terminal amino groups and 7,0x 10' moles/g of terminal carboxyl groups.

Both molecular weights are 13,000. By appropriately blending these two types of polyamides, a polyamide having the intended end group ratio was obtained. In addition, the same results were obtained in the molded product even when the end group ratio was adjusted during polymerization instead of blending the two types of polyamides.

Component (D) is an ethylene propylene copolymer (C-1) containing 1 mol % of maleic anhydride and having a melt index of 0.4 g/10 minutes, or an ethylene propylene copolymer (C-1) containing 0.5 mol % of maleic anhydride and having a melt index of 2. 0 ethylene-ethyl acrylate copolymer (C-2) was used.

As component (E), styrene-ethylene-butylene-styrene copolymer (Shell Chemical 1l Kraton G
-1651> was used.

First, pellets were made by extruding a blend of the above-mentioned components at a temperature of 290° C. using a twin-screw extruder equipped with a vacuum vent. Molded articles were made from the pellets using an injection molding machine set at a cylinder temperature of 280° C., an injection pressure of 1.2 ooB, "crA, and a mold temperature of 80° C., and were subjected to tests for various properties.

The ingredients of the resin compositions used in each Example and Comparative Example and the results of tests on various properties are shown in Table 1.

The various properties described in the Examples and Comparative Examples were evaluated by the following methods.

(1) Melt index: Measured at 280°C and 5 kg load based on JIS K7210 2 Tensile strength: ASTH0638 3 Bending properties: ASTHDγ90 4 Izot impact strength: AST) f D2565
Heat distortion temperature: AST)l [)648 (4,6KFI
/cm load) 6 How to break: A punching impact test was conducted on a molded product with a thickness of 3 mm using 130'C15TrL/SeC to find out how to break.

Without the use of maleic anhydride, the compositions of the present invention using functionalized polyphenylene ethers have dramatically improved melt index and improved Izot strength.

Out wish Man engineering Plastics Co., Ltd.

Claims (1)

[Claims] 1. (A) General formula (1) (I)-Z-(II) (1) (wherein (I) is general formula (2) ▲There are mathematical formulas, chemical formulas, tables, etc.▼・・・・・・・・・
(2) (In the formula,
Z is a divalent hydrocarbon group, and (II) is a carboxylic acid group, acid anhydride group, acid amide group, imide group, or carboxylic acid ester group. 20 to 77% by weight of functionalized polyphenylene ether which is a reaction product of a compound represented by (at least one group selected from , amino group, or hydroxy group) and polyphenylene ether: (B) non-functionalized polyphenylene Ether 0-50% by weight
(C) 20 to 77% by weight of polyamide: (D) At least one functional group selected from carboxylic acid groups, carboxylic acid metal bases, carboxylic ester groups, carboxylic acid anhydride groups, and imide groups in the molecule. and (E) 0 to 20% by weight of a styrenic elastomer (however, the above weight% is based on the total weight of the resin composition). 2. The resin composition according to claim 1, wherein the functionalized polyphenylene ether contains 0.1 to 6% by weight of reactive residues of the compatibilizing compound. 3. The compound of general formula (1) is at least one of chloroformylsuccinic anhydride, chloroethanolsuccinic anhydride, trimellitic anhydride chloride, trimellitic anhydride, acetic anhydride, and terephthalic acid chloride. A resin composition according to claim 1. 4. The resin composition according to claim 1, wherein the polyamide is a polyamide containing a greater number of terminal amino groups than the amount of terminal carboxyl groups.