JPH08104799A - Resin composition - Google Patents

Abstract

PURPOSE: To provide a resin composition which maintains the impact resistance at a sufficiently high level, is excellent in processability by virtue of the high fluidity, and also is excellent in antistatic properties. CONSTITUTION: The composition comprises a thermoplastic polyester resin, an epoxidized ethylene copolymer, and a reaction product of a styrene-maleic anhydride copolymer with a polyalkylene oxide monoalkyl ether and/or a metal salt of the reaction product.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a resin composition. More specifically, the present invention relates to a resin composition which is excellent in processability because it has a sufficiently high level of impact resistance and has a high fluidity and is also excellent in antistatic property.

[0002]

2. Description of the Related Art Generally, thermoplastic polyester resins are widely used as engineering plastics because they are excellent in weather resistance, electrical characteristics, chemical resistance, abrasion resistance and heat aging resistance. However, the impact resistance of the molded product has a difficulty or a point to be improved, which is an obstacle to practical application. Various methods have been proposed so far as methods for improving the impact resistance, which is a drawback of such thermoplastic polyester resins.

For example, as a typical method, a composition using an ethylene-glycidyl methacrylate copolymer as a modifier (Japanese Patent Publication No. 58-47419), a terpolymer such as ethylene-glycidyl methacrylate-methyl acrylate, etc. A composition containing a modifier (Japanese Patent Publication No. 59-2822).
No. 3), and a composition obtained by dry blending an ethylene-glycidyl methacrylate copolymer and an ethylene-propylene random copolymer and melt-mixing with a screw extruder in order to further improve low temperature impact resistance ( JP-B-63-4566) and an ethylene-glycidyl methacrylate copolymer and an ethylene-α-olefin-specific non-conjugated diene terpolymer are dry-blended and melt-mixed by a screw extruder to obtain The disclosed composition (Japanese Patent Publication No. 1-26380) is proposed.

However, in the above-mentioned prior art, although it is possible to obtain a thermoplastic polyester resin having improved impact resistance, for example, due to an interaction such as a chemical reaction occurring between the thermoplastic polyester resin and the modifier. The fluidity of the obtained thermoplastic resin composition is reduced.
Thermoplastic resin compositions with reduced fluidity have recently become larger,
It is difficult to develop for use in injection-molded products where the wall thickness is thin and the shape is complicated, and it is feared that such a decrease in fluidity prolongs the injection-molding cycle and causes a decrease in the productivity of the molded products.

Therefore, it is strongly desired to develop a composition which does not cause the above problems, that is, a thermoplastic polyester resin composition having good impact resistance and fluidity.

[0006]

In view of the present situation, the present invention maintains impact resistance at a sufficiently high level and has high fluidity so that it is excellent in workability and antistatic. The point is to provide a resin composition.

[0007]

That is, the present invention relates to a resin composition containing the following components (A) to (C). (A) component: thermoplastic polyester resin (B) component: epoxy group-containing ethylene copolymer (C) component: reaction product of styrene-maleic anhydride copolymer and polyalkylene oxide monoalkyl ether and / or Metal salt of reaction product

The details will be described below.

The component (A) of the present invention is a thermoplastic polyester resin, which is usually obtained from a dicarboxylic acid and a diol.

Examples of the dicarboxylic acid are aliphatic dicarboxylic acids having 2 to 20 carbon atoms such as azelaic acid, adipic acid, sebacic acid and dodecanedicarboxylic acid; terephthalic acid, isophthalic acid, orthophthalic acid, diphenyl-4,4-dicarboxylic acid. , Aromatic dicarboxylic acids such as diphenylethane-4,4-dicarboxylic acid and naphthalenedicarboxylic acid; and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid. In addition, these may be used individually by 1 type, or may be used in mixture of 2 or more types.

At least 4 of the dicarboxylic acids used
It is preferable that 0 mol% is terephthalic acid.

As the diol, ethylene glycol,
1,3-propanediol, 1,4-butanediol,
1,5-pentadiol, 1,6-hexanediol,
Examples thereof include aliphatic glycols or alicyclic glycols having 2 to 20 carbon atoms such as 1,10-decanediol and 1,4-cyclohexanediol. In addition, these may be used individually by 1 type, or may be used in mixture of 2 or more types.

Specific preferred examples of the component (A) include polyethylene terephthalate and polybutylene terephthalate. Further, the intrinsic viscosity measured at 25 ° C. using o-chlorophenol as a solvent is 0.
It is preferably 5 to 3.0 dl / g. If the intrinsic viscosity is too low or too high, the resulting resin composition may have insufficient mechanical strength.

The component (B) of the present invention is an epoxy group-containing ethylene copolymer, usually 50 to 99% by weight of ethylene unit, 0.1 to 30% by weight of unsaturated carboxylic acid glycidyl ester unit or unsaturated glycidyl ether unit. % And an ethylenically unsaturated ester compound unit of 0 to 50% by weight.

The unsaturated carboxylic acid glycidyl ester unit is usually a constitutional unit represented by the following chemical formula (1).

[0016]

(R ¹ represents a C 2-18 hydrocarbon group having an ethylenically unsaturated bond.)

Specific examples of the compound having the constituent unit include glycidyl acrylate, glycidyl methacrylate, itadic acid glycidyl ester and the like.

The unsaturated glycidyl ether unit is usually a constitutional unit represented by the following chemical formula (2).

[0020]

(R ² represents a hydrocarbon group having an ethylenically unsaturated bond and having 2 to 18 carbon atoms, and X represents a methyleneoxy group or a phenoxy group.)

Specific examples of the compound having the constituent unit include allyl glycidyl ether, 2-methylallyl glycidyl ether, styrene-p-glycidyl ether and the like.

Examples of the ethylenically unsaturated ester compound unit in the component (B) include saturated vinyl carboxylates such as vinyl acetate and vinyl propionate, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate and methacrylic acid. It may contain an α, β-unsaturated carboxylic acid alkyl ester such as ethyl acid or butyl methacrylate. Among them, from the viewpoint of productivity and mechanical properties of the resin composition obtained by the present invention, vinyl acetate,
Methyl acrylate and ethyl acrylate are preferred. The ethylenically unsaturated ester compound unit is a constituent component that can be appropriately used in the component (B), and is not an essential component.

As the component (B), JIS K6760 is used.
Melt index measured according to
It is preferably 0 g / 10 minutes, more preferably 2 to 50 g / 10 minutes. If the melt index is too small, the compatibility with the component (A) may be insufficient, and as a result, the mechanical properties of the resulting composition may be insufficient. On the other hand, if the melt index is too large, the mechanical properties of the resulting composition may be insufficient.

The component (B) can be produced by a known method, for example, by subjecting the monomers to be copolymerized to a suitable solvent or chain transfer at 500 to 4000 at 100 to 300 ° C. in the presence of a radical generator. A method of copolymerizing in the presence or absence of an agent, a method of mixing an unsaturated epoxy compound and a radical generator with polyethylene, and performing melt graft copolymerization in an extruder, and the like can be used.

As the component (B) of the present invention, the epoxy group-containing ethylene copolymer and a rubber component may be used in combination.

The rubber component is, for example, ethylene-propylene rubber, ethylene-propylene-non-conjugated diene rubber, ethylene-butene rubber, ethylene-butadiene rubber or the like, or a rubber composed of an ethylene unit and an α-olefin unit having 3 or more carbon atoms. Ethylene copolymers such as rubbers consisting of ethylene units to which conjugated diene units are added-α olefin units having 3 or more carbon atoms-non-conjugated diene units, styrene butadiene rubber, SBS rubber, hydrogenated SBS rubber, liquid polymerized styrene-butadiene Styrene rubber such as rubber, or polyisobutylene rubber, butyl rubber, butadiene rubber, isoprene rubber, Alfie rubber, nitrile rubber, fluoro rubber, vinyl pyridine rubber, silicone rubber, butadiene-methyl methacrylate rubber, acrylic rubber, urethane rubber, Examples include epichlorohydrin rubber, chlorobutyl rubber and bromobutyl rubber. Further, these may be mixed with each other or modified with maleic anhydride, a halogen compound, a vinyl compound, an acrylic compound unless they have a bad influence such as an overreaction with the epoxy group-containing ethylene copolymer. It doesn't matter.

The rubber component and the epoxy group-containing ethylene copolymer are dry-blended with the other components and then melt-mixed by a screw extruder, or the rubber component and the epoxy group-containing ethylene copolymer are melted in advance. The mixed mixture may be dry blended with other components and melt mixed by a screw extruder.

Regarding the ratio of the rubber component to the epoxy group-containing ethylene copolymer, the rubber component is 80 to 30% by weight, the epoxy group-containing ethylene copolymer is 20 to 70% by weight, and preferably the rubber component is 70 to 40%. %, And the ratio of the epoxy group-containing ethylene copolymer is 30 to 60% by weight. When the ratio of the epoxy group-containing ethylene copolymer is less than 20% by weight, the resulting mixture pellets have high mutual sticking property and poor handling property. On the contrary, when the ratio exceeds 70% by weight, it is satisfactory as a modifier for the thermoplastic polyester resin. You cannot give the effect that you can.

The melt mixture of the rubber component and the epoxy group-containing ethylene copolymer is melt-blended by a closed kneader such as a Banbury mixer, a heated roll mill or a pressure kneader, and the obtained block is extruded by an extruder. It is obtained by using it and processing it into a pellet form. Further, when melt blending with a Banbury mixer or the like, appropriate amounts of various additives, colorants, fillers and the like can be added as necessary.

The component (C) of the present invention is a reaction product of a styrene-maleic anhydride copolymer and a polyalkylene oxide monoalkyl ether and / or a metal salt of the reaction product.

The styrene-maleic anhydride copolymer preferably has a number average molecular weight of 1000 to 400000 and a styrene / maleic anhydride molar ratio of 1/1 to 9/1. When the reaction with the polyalkylene oxide monoalkyl ether is carried out in a reaction vessel in the absence of a solvent, the number average molecular weight is 1000 to 4000 and the molar ratio is 1/1.
Those of about 5/1 are particularly preferable. Furthermore, when the reaction is carried out using an extruder for plastics, the number average molecular weight is 150,000 to 400,000, and the molar ratio is 4 /.
It is preferably from 1 to 9/1. As an example of the former,
SMA (registered trademark) resin sold by Elf Atchem, and an example of the latter is Dailark (registered trademark) sold by Arco Chemical.

The polyalkylene oxide monoalkyl ether is usually a compound represented by the following chemical formula (3).

[0034]

(In the formula, R ³ represents an alkyl group having 1 to 4 carbon atoms, R ⁴ represents hydrogen or an alkyl group having 1 to 2 carbon atoms, and n represents an integer of 5 to 100.)

As the polyalkylene oxide monoalkyl ether, one kind thereof may be used alone,
Two or more kinds may be mixed and used (for example, R ⁴ is hydrogen and methyl is used).

When the carbon number of R ³ and R ⁴ exceeds 4, the antistatic performance becomes insufficient.

The polyalkylene oxide monoalkyl ether preferably has a number average molecular weight of 100 to 5,000. If the number average molecular weight is too small, the antistatic property may be insufficient, while if the number average molecular weight is too large, the reactivity with the styrene-maleic anhydride copolymer may be insufficient.

Polyethylene oxide monomethyl ether can be mentioned as a preferable polyalkylene oxide monoalkyl ether from the viewpoint of reactivity and performance of the reaction product.

The reaction between the styrene-maleic anhydride copolymer and the polyalkylene oxide monoalkyl ether is
The styrene-maleic anhydride copolymer and the polyalkylene oxide monoalkyl ether may be heated together. Specific examples can be roughly classified into a batch system using a heating reaction tank equipped with a stirrer and a continuous system utilizing a uniaxial or biaxial extruder used for kneading and molding of resin and rubber. In either system, the amount of the styrene-maleic anhydride copolymer and the polyalkylene oxide monoalkyl ether supplied is such that the terminal of the polyalkylene oxide monoalkyl ether with respect to the maleic anhydride group in the styrene-maleic anhydride copolymer. The molar ratio of hydroxyl groups is usually set in the range of 1.2 to 0.1, preferably 0.8 to 0.2. If the molar ratio is too large, the amount of unreacted polyalkylene oxide monoalkyl ether mixed in the reaction product may increase, which may lead to a problem of surface tackiness of the molded product and deterioration of mechanical properties. On the other hand, if the molar ratio is too small, the antistatic performance may be insufficient.

In a batch system using a reaction vessel, a predetermined amount of polyalkylene oxide monoalkyl ether is charged and heated to 120 to 200 ° C., preferably 140 to 180 ° C. in a nitrogen atmosphere and powdered with stirring. Alternatively, pelletized styrene-maleic anhydride copolymer is gradually added up to a predetermined amount and reacted for usually 10 to 300 minutes, preferably 30 to 180 minutes. If the reaction temperature is lower than 120 ° C, the viscosity of the reaction system is large and the reaction rate is slow, so that productivity is a problem, and if it exceeds 200 ° C, the decomposition reaction of the polyalkylene oxide monoalkyl ether occurs simultaneously. A reaction rate of polyalkylene oxide monoalkyl ether determined by a method of adding excess sodium hydroxide aqueous solution to the product acetone solution and stirring at room temperature for 20 minutes and then back titrating with sulfuric acid aqueous solution is 50% or more, preferably 70%. React to more than%. In some cases, it may be preferable to coexist an appropriate solvent or catalyst in order to increase the reaction rate.

The most rational embodiment of the batch method is to use the same reaction vessel and to use alkali metal (Li, Na,
Ring-opening polymerization of alkylene oxide in the presence of alkyl alcohols such as methyl alcohol and ethyl alcohol, or low molecular weight glycol monoalkyl ethers such as ethylene glycol monomethyl ether and diethylene glycol monomethyl ether using the hydroxide or alcoholate of K) as a catalyst. Then, (B) polyalkylene oxide monoalkyl ether is synthesized, and the heat of polymerization is 140-
This is a method in which a styrene-maleic anhydride copolymer is added while the temperature is kept at 180 ° C. to carry out an addition reaction in the latter stage.

On the other hand, in the continuous system using a single-screw or twin-screw extruder, the raw material styrene-maleic anhydride copolymer and polyalkylene oxide monoalkyl ether and, if necessary, the diluent thermoplastic resin are quantitatively added. It is supplied and melt-kneaded at 150 to 250 ° C. The styrene-maleic anhydride copolymer has a number average molecular weight of 100.
When using 0 to 4000 alone, the reactivity is good, but the fluidity is too high, so that the number average molecular weight is 200.
It is preferable to blend an appropriate amount of 0-40,000 and supply.

The thermoplastic resin for dilution is 150 to 2
It is preferable that the melt viscosity at 50 ° C. does not have a reactive polar group within an appropriate range. Specific examples thereof include polyolefin resins such as polyethylene and polypropylene; polystyrene, rubber-modified polystyrene, styrene-acrylonitrile copolymer, acrylonitrile-butadiene /
Polystyrene resin such as styrene copolymer; and the like can be used. The supply amount of the thermoplastic resin for dilution is usually 0.5 to 10 times the total amount of the styrene-maleic anhydride copolymer and the polyalkylene oxide monoalkyl ether,
It is preferably 1 to 5 times. As a method of supplying the polyalkylene oxide monoalkyl ether, a styrene-acrylonitrile copolymer and, if necessary, a thermoplastic resin for dilution are mixed in a batch type mixer, and then a method of supplying from a main feeder is also used. It is also possible to supply in the state of heating and melting by using a pump from the side feeder of the machine.

With respect to the reaction product of a styrene-maleic anhydride copolymer and a polyalkylene oxide monoalkyl ether, various metal oxides, hydroxides, carbonates, acetates or higher fatty acids such as stearic acid can be used. A metal salt (ionomer) of the reaction product can be synthesized by adding a salt or the like and heating and kneading at 150 to 250 ° C. for neutralization. Metals include lithium, sodium,
Preference is given to potassium, magnesium, aluminum, zinc and the like. It is preferable that 10 to 90 mol% of the total amount of the acid anhydride groups remaining in the reaction product and the carboxylic acid groups by-produced is neutralized. As a method of the neutralization reaction, there are a batch method using a heating reaction tank equipped with a stirrer and a continuous method utilizing a uniaxial or biaxial extruder.

The resin composition of the present invention comprises the above-mentioned (A) component 6
4-96% by weight, preferably 70-92% by weight, (B)
Component 3 to 30% by weight, preferably 5 to 25% by weight, and component (C) 1 to 6% by weight, preferably 2 to 5% by weight,
(However, (A) component + (B) component + (C) component = 10
0% by weight. ) Consists of.

When the component (A) is too small, the tensile properties, bending properties and heat resistance may be poor. If the component (B) is too small, the impact resistance may be poor. If the amount of component (C) is too small, the fluidity may decrease, the processability may be poor, and the antistatic property may be poor.

As a method for obtaining the resin composition of the present invention,
Although not particularly limited, melt kneading can be performed using a commonly used kneader such as a single-screw or twin-screw extruder, Banbury mixer, roll, and various kneaders. In the case of melt-kneading using an extruder, the components (A) and (B) may be dry-blended in advance and then fed to the extruder, or may be individually fed using two feeders. be able to. Regarding the component (C), a pellet-shaped product is preliminarily dry-blended with the components (A) and (B) and then fed to an extruder, or a liquid material heated and melted is directly fed into the extruder by various pumps. Can also be used. Further, the component (C) master batch obtained by melt-kneading the component (C) with another resin may be used for melt-kneading with the components (A) and (B).

In the resin composition of the present invention, if necessary,
Generally added to thermoplastic resins, heat stabilizers, antioxidants, weathering agents, light stabilizers, nucleating agents, lubricants, release agents, pigments,
A flame retardant, a filler and a reinforcing agent such as glass fiber can be added. In addition to the component (C), a processability improver, an antistatic agent, etc. may be used in combination. The resin composition of the present invention is optimally used in the fields of, for example, automobile parts, electric and electronic device parts, by taking advantage of its excellent characteristics.

[0050]

EXAMPLES The evaluation method is as follows. (1) MFR (melt flow rate) (fluidity = workability) It was measured according to ASTM D1238 (250 ° C., 2160 g). (2) Tensile Properties Physical properties were measured according to ASTM D638 (test piece thickness 1/8 inch). (3) Bending property It measured according to ASTM D790 (test piece thickness 1/8 inch). (4) Impact strength The strength was measured according to ASTM D256 (test piece thickness 1/8 inch, measurement temperature -30, -10, 0, 23 ° C). (5) Antistatic property Using a super insulation meter SM-8210 and flat plate electrode SME-8310 manufactured by Toa Denpa Kogyo Co., Ltd., a ⅛ inch flat plate was injection-molded for 3 days and then conditioned at 23 ° C. and 50 ° C. It was measured under the condition of% RH.

Examples 1 to 6 and Comparative Examples 1 to 6 The components shown in Tables 1, 2 and 3 were kneaded using a 30 mmφ twin-screw extruder to obtain resin compositions. The resin composition was evaluated according to the method described above. The results are shown in Tables 2 and 4.
And 6 are shown.

The results show the following. All the examples satisfying the conditions of the present invention show satisfactory results in all evaluation items. On the other hand, Comparative Example 2 lacking the component (B) is inferior in impact resistance. Further, Comparative Examples 3, 4, 5 and 6 lacking the component (C) are inferior in fluidity (workability) and antistatic property. Furthermore, lacking the components (B) and (C),
Comparative Example 1 using only the component (A) is inferior in impact resistance, fluidity (workability) and antistatic property.

[0053]

[Table 1] ------------------------------------- Example --Example-- Comparative Example Comparative Example Comparative Example 1 2 1 2 3 Combination (A) Component type * 1 A1 A1 A1 A1 A1 amount wt% 87 87 100 97 90 (B) Component type * 2 B1 B2--B1 amount wt% 10 10 0 0 10 (C) Component type * 3 C1 C1-C1-amount wt% 3 3 0 3 0 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

[0054]

[Table 2] ------------------------------------- Example --Example --Comparative Example Comparative Example Comparative Example Comparative Example 1 2 1 2 3 Evaluation results MFR g / 10min 25 26 27 48 17 Tensile properties YS kg / cm ² 410 410 550 500 440 US kg / cm ² 260 290 540 350 290 UE% 42 43 410 290 28 Bending properties FM kg / cm ² 17600 17400 26000 21800 20500 FS kg / cm ² 640 640 900 790 730 Impact resistance -30 ℃ 8.4 8.0 4.4 4.5 8.6 -10 ℃ 9.7 9.5 4.8 4.2 11 0 ℃ 9.9 10 4.6 4.5 11 +23 ℃ 12 12 4.4 5.2 12 Electrostatic Prevention property Volume resistivity 2.5 2.9 5.2 1.0 7.2 Ω ・ cm × 10 ¹⁵ × 10 ¹⁵ × 10 ¹⁶ × 10 ¹⁶ × 10 ¹⁵ Surface resistivity 4.2 3.0 1.1 1.3 3.4 Ω / □ × 10 ¹² × 10 ¹² × 10 ¹⁷ × 10 ¹⁶ × 10 ¹⁵ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

[0055]

[Table 3]

[0056]

[Table 4]

[0057]

[Table 5] ------------------------------------------ Examples Comparative Examples Examples Comparative Examples 5 5 6 6 Blend (A) Component type * 1 A1 A1 A1 A1 amount wt% 87 90 77 80 (B) Component type * 2 B3 B3 B3 B3 amount wt% 10 10 20 20 (C) Component type * 3 C1-C1-Amount wt % 3 0 3 0 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

[0058]

[Table 6] ------------------------------------------ Examples Comparative Examples Examples Comparative Examples 5 5 6 6 Evaluation results MFR g / 10min 19 12 1.0 0.27 Tensile properties YS kg / cm ² 430 440 380 320 US kg / cm ² 420 360 370 350 UE% 340 24 310 370 Bending properties FM kg / cm ² 17400 21000 12300 14100 FS kg / cm ² 630 720 460 500 Impact resistance -30 ℃ 5.3 6.1 7.6 10 -10 ℃ 7.0-15 70 0 ℃ 8.8 10 77 88 +23 ℃ 36 33 90 86 Antistatic volume resistivity 2.0 9.0 4.3 4.0 Ω ・ cm × 10 ¹⁵ × 10 ¹⁵ × 10 ¹⁶ × 10 ¹⁶ Surface resistivity 5.5 7.8 1.0 6.3 Ω / □ × 10 ¹⁵ × 10 ¹⁵ × 10 ¹⁵ × 10 ¹⁵ −−−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−

* 1 Type of component (A) A1: Polybutylene terephthalate (Intrinsic viscosity measured at 25 ° C. using o-chlorophenol as a solvent = 1.0 d
l / g)

* 2 Type of component (B) B1: ethylene (86.2% by weight) -glycidyl methacrylate (12% by weight) -vinyl acetate (1.8% by weight)
50 parts by weight of a copolymer (melt index = 3.0 g / 10 minutes measured according to ASTM D1238),
EPDM; ethylene (76.7 mol%)-propylene (23.1 mol%)-5-ethylidene-2-norbornene (0.2 mol%) copolymer (Moonie viscosity ML)
_{1 + 4} (121 ° C. = 68) and 50 parts by weight are melt-kneaded using a 4.0 L Banbury mixer, and the obtained melt-kneaded product is pelletized by a 65 mmφ extruder equipped with an underwater type cutting device. To obtain B1.

B2: ethylene (86.2% by weight) -glycidyl methacrylate (12% by weight) -vinyl acetate (1.8% by weight) copolymer (melt index = 3.0 g / measured in accordance with ASTM D1238) 10
Min) 38 parts by weight, EPDM; ethylene (76.7 mol%)-propylene (23.1 mol%)-5-ethylidene-2-norbornene (0.2 mol%) copolymer (Moonie viscosity ML ₁₊ 62 parts by weight of ₄ (121 ° C.) = 68) was melt-kneaded using a 4.0 L Banbury mixer, and the obtained melt-kneaded product was pelletized by a 65 mmφ extruder equipped with an underwater type cutting device to form B2. Got

B3: ethylene (66% by weight) -glycidyl methacrylate (6% by weight) -methyl acrylate (28% by weight) copolymer (melt index = 10 g / 10 minutes measured according to ASTM D1238)

* 3 Type of component (C) C1: 200 g of diethylene glycol monomethyl ether and 0.4 g of flake caustic soda were charged into an autoclave equipped with a magnetic stirrer of 3 liters, and gas replacement was performed once with nitrogen and three times with ethylene oxide. , Heated to 170 ° C, internal pressure 2 kg / cm ² , internal temperature 160-170 ° C
Then, 1440 g of liquid ethylene oxide was supplied over 2.5 hours while controlling with an external water cooling system to synthesize polyethylene oxide monomethyl ether (hereinafter referred to as MEG-1). The hydroxyl value (pyridine / acetic anhydride method) measured by the standard oil and fat analysis test method established by the Japan Oil Chemistry Association is 5
It was 8.3 mgKOH / g.

After cooling to 140 ° C., the atmosphere was replaced with nitrogen and 800 g of a powdery styrene-maleic anhydride copolymer (at SMA (registered trademark) # 3,000 manufactured by Elf Atochem Co., Ltd.) was added under a substitution atmosphere at normal pressure. , Number average molecular weight 1,900, styrene: maleic anhydride = 3: 1 copolymerization molar ratio) (hereinafter SM
(Referred to as A-1) is gradually added, and the mixture is dissolved with stirring at 180 ° C.
And react for 2 hours in a comb-type polyol ether (hereinafter SP
O-1) was synthesized. SPO-1 was a soft waxy solid, and the acetone solution thereof was analyzed by the titration method for determining the acid value described above. As a result, the reaction rate for MEG-1 was 78%.

The styrene-maleic anhydride copolymer as the component (C) has a number average molecular weight of 3460, and
The styrene / maleic anhydride molar ratio of the component was 3/1, and the number average molecular weight of the polyalkylene oxide monoalkyl ether of the component (C) was 1,000.

[0066]

Industrial Applicability As described above, the present invention provides a resin composition which has a sufficiently high level of impact resistance and has a high fluidity so that it has excellent processability and antistatic properties. We were able to.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C08L 25:08)

Claims (8)

[Claims] 1. A resin composition containing the following components (A) to (C). (A) component: thermoplastic polyester resin (B) component: epoxy group-containing ethylene copolymer (C) component: reaction product of styrene-maleic anhydride copolymer and polyalkylene oxide monoalkyl ether and / or Metal salt of reaction product 2. The resin composition according to claim 1, wherein the component (A) is polyethylene terephthalate and / or polybutylene terephthalate. 3. The resin composition according to claim 1, wherein the component (B) is an ethylene-unsaturated carboxylic acid glycidyl ester copolymer and / or an ethylene-unsaturated glycidyl ether copolymer. 4. The resin composition according to claim 1, wherein the styrene-maleic anhydride copolymer as the component (C) has a number average molecular weight of 1,000 to 400,000. 5. The resin composition according to claim 1, wherein the component (C) has a styrene / maleic anhydride molar ratio of 1/1 to 9/1. 6. The (C) component polyalkylene oxide monoalkyl ether has a number average molecular weight of 100 to 5,000.
The resin composition according to claim 1, which is polyethylene oxide monomethyl ether. 7. The resin composition according to claim 1, wherein the metal salt of the component (C) is a lithium salt, a sodium salt, a potassium salt, a magnesium salt, an aluminum salt or a zinc salt. 8. A component (A) 64-96% by weight, a component (B) 3-30% by weight and a component (C) 1-6% by weight (provided that the component (A) + the component (B) + (C)). The resin composition according to claim 1, wherein the component is 100% by weight.