JP3344109B2 - Resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition. More specifically, the present invention relates to a resin composition that maintains impact resistance at a sufficiently high level, has high flowability, is excellent in processability, and is also excellent in antistatic properties.

[0002]

2. Description of the Related Art In general, thermoplastic polyester resins are widely used as engineering plastics because of their excellent weather resistance, electrical properties, chemical resistance, abrasion resistance and heat aging resistance. However, the molded article has a difficulty or a point requiring improvement in the impact resistance, which is an obstacle in exploring practical applications. Various methods have been proposed as methods for improving the impact resistance, which is a disadvantage of the thermoplastic polyester resin.

[0003] For example, typical methods include a composition using an ethylene-glycidyl methacrylate copolymer as a modifier (Japanese Patent Publication No. 58-47419), and a terpolymer such as ethylene-glycidyl methacrylate-methyl acrylate. (JP-B-59-2822)
No. 3) and a composition obtained by dry-blending an ethylene-glycidyl methacrylate copolymer and an ethylene-propylene random copolymer in order to further improve low-temperature impact resistance, and melt-mixing with a screw extruder ( JP-B-63-4566) and a ternary copolymer composed of an ethylene-glycidyl methacrylate copolymer and an ethylene-α-olefin-specific non-conjugated diene are dry-blended and melt-mixed with a screw extruder to obtain a mixture. Compositions (Japanese Patent Publication No. 1-26380) and the like have been proposed.

[0004] However, in the above prior art, it is possible to obtain a thermoplastic polyester resin having improved impact resistance. However, for example, an interaction such as a chemical reaction that occurs between the thermoplastic polyester resin and a modifying agent can be obtained. The fluidity of the obtained thermoplastic resin composition decreases.
In recent years, thermoplastic resin compositions with reduced fluidity have become larger,
It is difficult to develop it for an injection molded product whose thickness and shape are extremely complicated, and there is a fear that such a decrease in fluidity may prolong the injection molding cycle and cause a decrease in productivity of the molded product.

[0005] Therefore, there is a strong demand for the development of a composition which does not cause the above-mentioned problems, that is, a thermoplastic polyester resin composition having good impact resistance and fluidity.

[0006]

In view of the above situation, the present invention maintains excellent impact resistance at a sufficiently high level, has high fluidity, and is excellent in workability and also excellent in antistatic properties. It is in providing 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 with 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.

The dicarboxylic acids include 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 And 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.

It is to be noted that at least 4 of the dicarboxylic acids used
Those in which 0 mol% is terephthalic acid are preferred.

As the diol, ethylene glycol,
1,3-propanediol, 1,4-butanediol,
1,5-pentadiol, 1,6-hexanediol,
Examples thereof include aliphatic glycols having 2 to 20 carbon atoms and alicyclic glycols 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 0.1.
It is preferably from 5 to 3.0 dl / g. If the intrinsic viscosity is too low or too high, the mechanical strength of the obtained resin composition may be insufficient.

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

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

[0016]

(R ¹ represents a hydrocarbon group having 2 to 18 carbon atoms having an ethylenically unsaturated bond.)

Specific examples of the compound having the structural unit include glycidyl acrylate, glycidyl methacrylate and glycidyl itaconate.

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

[0020]

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

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

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

As the component (B), JIS K6760
Melt index measured according to 0.5 to 10
Those having 0 g / 10 min are preferable, and those having 2 to 50 g / 10 min are more preferable. 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 a monomer to be copolymerized to a suitable solvent or chain transfer at 500 to 4000 atm and 100 to 300 ° C. in the presence of a radical generator. A method in which copolymerization is carried out in the presence or absence of an agent or a method in which an unsaturated epoxy compound and a radical generator are mixed with polyethylene and melt-grafted and copolymerized in an extruder can be used.

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

The rubber component includes, for example, a rubber composed of an ethylene unit and an α-olefin unit having 3 or more carbon atoms, such as ethylene-propylene rubber, ethylene-propylene-non-conjugated diene rubber, ethylene-butene rubber, ethylene-butadiene rubber, and the like. Ethylene copolymers such as rubbers comprising ethylene units to which conjugated diene units are added, α-olefin units having 3 or more carbon atoms and 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, silicon rubber, butadiene-methyl methacrylate rubber, acrylic rubber, urethane rubber, Epichlorohydrin rubber, chlorobutyl rubber, bromobutyl rubber and the like. These may be mixed with each other or modified with a maleic anhydride, a halogen compound, a vinyl compound, or an acrylic compound as long as they do not have a bad effect such as an overreaction with the epoxy group-containing ethylene copolymer. No problem.

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

The ratio of the rubber component to the epoxy group-containing ethylene copolymer is 80 to 30% by weight for the rubber component, 20 to 70% by weight for the epoxy group-containing ethylene copolymer, and preferably 70 to 40% by weight. % By weight, and the ratio of the epoxy group-containing ethylene copolymer is 30 to 60% by weight. When the proportion of the epoxy group-containing ethylene copolymer is less than 20% by weight, the obtained mixture pellets have high cohesiveness and poor handling properties. Conversely, when the proportion exceeds 70% by weight, it is satisfactory as a modifier for a thermoplastic polyester resin. Can not give the effect that can be.

The molten 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 processing it into pellets. Further, when melt-blending with a Banbury mixer or the like, appropriate amounts of various additives, coloring agents, 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 with 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 1,000 to 400,000 and a molar ratio of styrene / maleic anhydride of 1/1 to 9/1. When the reaction with the polyalkylene oxide monoalkyl ether is carried out in a reaction vessel without solvent, the number average molecular weight is from 1,000 to 4,000, and the molar ratio is 1/1.
５5/1 are particularly preferred. Further, 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 /
1-9 / 1 are preferred. As an example of the former,
SMA (registered trademark) resin sold by Elf Atochem Co., and an example of the latter is Dairak (registered trademark) sold by Arco Chemical Company.

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 used as a mixture (for example, those in which R ⁴ is hydrogen and a methyl group).

If 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 properties may be insufficient, while if the number average molecular weight is too large, the reactivity with the styrene-maleic anhydride copolymer may be insufficient.

From the viewpoint of reactivity and performance of the reaction product, polyethylene oxide monomethyl ether can be mentioned as a preferred polyalkylene oxide monoalkyl ether.

The reaction between the styrene-maleic anhydride copolymer and the polyalkylene oxide monoalkyl ether is as follows:
What is necessary is just to heat in the state where a styrene-maleic anhydride copolymer and a polyalkylene oxide monoalkyl ether coexist. Specific examples can be broadly classified into a batch system using a heating reaction tank equipped with a stirrer and a continuous system using a single-screw or twin-screw extruder used for kneading or molding resin or rubber. In either method, the supply amounts of the styrene-maleic anhydride copolymer and the polyalkylene oxide monoalkyl ether are based on the amount of the terminal in the polyalkylene oxide monoalkyl ether relative to the maleic anhydride groups in the styrene-maleic anhydride copolymer. The molar ratio of the hydroxyl group is usually set in the range of 1.2 to 0.1, preferably in the range of 0.8 to 0.2. If the molar ratio is too large, the amount of unreacted polyalkylene oxide monoalkyl ether in the reaction product increases, which may lead to problems such as surface stickiness of the molded product and a decrease in mechanical properties. On the other hand, if the molar ratio is too small, the antistatic performance may be insufficient.

In a batch method using a reaction tank, a predetermined amount of polyalkylene oxide monoalkyl ether is charged, and the mixture is heated to usually 120 to 200 ° C., preferably 140 to 180 ° C. under a nitrogen atmosphere, and then powdered under stirring. Alternatively, a styrene-maleic anhydride copolymer in the form of pellets is gradually added to a predetermined amount, and the reaction is usually performed for 10 to 300 minutes, preferably 30 to 180 minutes. When the reaction temperature is lower than 120 ° C., the viscosity of the reaction system is large and the reaction rate is low, so that productivity is problematic. When the reaction temperature is higher than 200 ° C., a decomposition reaction of polyalkylene oxide monoalkyl ether occurs simultaneously. After adding an excess aqueous sodium hydroxide solution to the acetone solution of the product and stirring at room temperature for 20 minutes, the reaction rate of the polyalkylene oxide monoalkyl ether determined by the method of back titration with a sulfuric acid aqueous solution is 50% or more, preferably 70% or more. %. In some cases, it may be preferable to use a suitable solvent or catalyst in order to increase the reaction rate.

The most rational embodiment in the batch mode uses the same reaction vessel, and in the first stage, the 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 (B) to synthesize a polyalkylene oxide monoalkyl ether,
This is a method in which a styrene-maleic anhydride copolymer is additionally added while the temperature is kept at 180 ° C. to cause a subsequent addition reaction.

On the other hand, in a 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 thermoplastic resin for dilution are quantitatively determined. Supply and melt-knead at 150-250 ° C. The styrene-maleic anhydride copolymer has a number average molecular weight of 100
When a compound having a number average molecular weight of 200 to 4000 is used alone, the reactivity is good but the fluidity is too high.
It is preferable to supply an appropriate amount of 00 to 40000 in a blended state.

As the thermoplastic resin for dilution, 150 to 2
Those having a reactive viscosity at 50 ° C. within an appropriate range and having no reactive polar group are preferred. Specific examples include polyolefin resins such as polyethylene and polypropylene; polystyrene, rubber-modified polystyrene, styrene-acrylonitrile copolymer, acrylonitrile-butadiene /
Polystyrene resins such as styrene copolymers; 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,
Preferably it is 1 to 5 times. As a method for supplying the polyalkylene oxide monoalkyl ether, a styrene-acrylonitrile copolymer and, if necessary, a thermoplastic resin for dilution are mixed with a batch mixer before being supplied from the main feeder. It is also possible to supply in a heated and melted state using a pump from a side feeder of the machine.

The reaction product of a styrene-maleic anhydride copolymer and a polyalkylene oxide monoalkyl ether is reacted with a higher fatty acid such as an oxide, hydroxide, carbonate, acetate or stearic acid of various metals. A metal salt (ionomer) of the reaction product can be synthesized by adding a salt or the like and neutralizing the mixture by heating and kneading at 150 to 250 ° C. As the metal, lithium, sodium,
Potassium, magnesium, aluminum, zinc and the like are preferred. It is preferable that 10 to 90 mol% of the total amount of the acid anhydride groups and carboxylic acid groups remaining as by-products in the reaction product 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 using a single or twin screw extruder.

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

If the amount of 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 the component (C) is too small, the fluidity may be reduced, the workability may be poor, and the antistatic property may be poor.

The method for obtaining the resin composition of the present invention includes:
Although there is no particular limitation, melt kneading can be performed using a commonly used kneader such as a single-screw or twin-screw extruder, a Banbury mixer, a roll, various kneaders, and the like. When melt-kneading using an extruder, for the components (A) and (B), a method of preliminarily dry blending and then feeding the extruder, or a method of separately feeding each using two feeders is also used. be able to. As for the component (C), a method in which the pellet-shaped material is dry-blended with the components (A) and (B) in advance and then fed to an extruder or a method in which a heated and melted liquid is directly fed into the extruder by various pumps Can also be used. The component (C) masterbatch 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,
Flame retardants, fillers, and reinforcing agents such as glass fibers can be added. In addition to the component (C), a processability improver, an antistatic agent and the like can 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 equipment parts by utilizing its excellent features.

[0050]

The evaluation method is as follows. (1) MFR (melt flow rate) (fluidity = processability) Measured according to ASTM D1238 (250 ° C., 2160 g). (2) Tensile properties Measured according to ASTM D638 (1/8 inch specimen thickness). (3) Flexural properties The flexural properties were measured according to ASTM D790 (1/8 inch specimen thickness). (4) Impact strength 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 manufactured by Toa Denpa Kogyo Co., Ltd. and a plate electrode SME-8310, a 1 / 8-inch flat plate was subjected to state adjustment for 3 days after injection molding, and then 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 mm φ twin screw extruder to obtain a resin composition. The resin composition was evaluated according to the method described above. Tables 2 and 4 show the results.
And 6.

The following can be seen from the results. All 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. Comparative Examples 3, 4, 5, and 6 lacking the component (C) are inferior in fluidity (workability) and antistatic properties. Furthermore, the components (B) and (C) are missing,
Comparative Example 1 using only the component (A) is inferior in impact resistance, fluidity (workability) and antistatic properties.

[0053]

Table 1------------------------------------------------------------------------------------------------Example 1 2 3 Composition (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 1 2 3 Evaluation result 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 Flexural properties FM kg / cm ² 17600 17400 26000 21800 20500 FS kg / cm ² 640 640 900 790 730 Impact resistance -30 ° C 8.4 8.0 4.4 4.5 8.6 -10 ° C 9.7 9.5 4.8 4.2 11 0 ° C 9.9 10 4.6 4.5 11 + 23 ° C 12 12 4.4 5.2 12 Prevention Volume resistivity 2.5 2.9 5.2 1.0 7.2 Ωcm × 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 ------------------------------------------------------------------- Comparative Example Comparative Example 5 5 6 6----------------------------------------------------------------------------------- Composition (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--------------------------------------------------------------------------------------------------------------- Evaluation result 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 Flexural properties FM kg / cm ² 17400 21000 12300 14100 FS kg / cm ² 630 720 460 500 Impact resistance -30 ° C 5.3 6.1 7.6 10 -10 ° C 7.0-15 70 0 ° C 8.8 10 77 88 + 23 ° C 36 33 90 86 Antistatic property Volume resistivity 2.0 9.0 4.3 4.0 Ωcm × 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 measured according to ASTM D1238 = 3.0 g / 10 min);
EPDM; ethylene (76.7 mol%)-propylene (23.1 mol%)-5-ethylidene-2-norbornene (0.2 mol%) copolymer (Mooney viscosity ML
_{1 + 4} (121 ° C.) = 68) 50 parts by weight are melt-kneaded using a 4.0 L Banbury mixer, and the obtained melt-kneaded material is pelletized by a 65 mmφ extruder equipped with an underwater cutting device. As a result, B1 was obtained.

B2: Ethylene (86.2% by weight) -glycidyl methacrylate (12% by weight) -vinyl acetate (1.8% by weight) copolymer (melt index = 3.0 g / measured according to ASTM D1238) 10
38 parts by weight) and EPDM; an ethylene (76.7 mol%)-propylene (23.1 mol%)-5-ethylidene-2-norbornene (0.2 mol%) copolymer (Mooney viscosity ML _{1+ 4} (121 ° C.) = 68) 62 parts by weight were melt-kneaded using a 4.0 L Banbury mixer, and the resulting melt-kneaded product was pelletized by a 65 mmφ extruder equipped with an underwater cutting device to obtain B2. I got

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

* 3 Type of component (C) C1: 200 g of diethylene glycol monomethyl ether and 0.4 g of flaky caustic soda were charged into a 3 liter autoclave equipped with a magnetic stirrer, and the mixture was purged once with nitrogen and three times with ethylene oxide. , Heated to 170 ° C, internal pressure 2kg / cm ² , internal temperature 160-170 ° C
While controlling with an external water cooling system, 1440 g of liquid ethylene oxide was supplied over 2.5 hours 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 leaving to be cooled to 140 ° C., 800 g of a powdery styrene / maleic anhydride copolymer (manufactured by Elf Atochem Co., Ltd., SMA (registered trademark) # 3,000) was replaced with nitrogen at normal pressure under a substitution atmosphere. , Number average molecular weight 1,900, styrene: maleic anhydride = 3: 1 copolymer molar ratio) (hereinafter SM
A-1) is gradually added, and after stirring and dissolving,
And react for 2 hours with a comb-shaped polyol ether (hereinafter referred to as SP
O-1) was synthesized. SPO-1 was a soft waxy solid, and the acetone solution thereof was analyzed by the above-mentioned titration method for determining an acid value. As a result, the conversion of MEG-1 was 78%.

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

[0066]

As described above, according to the present invention, there is provided a resin composition which maintains impact resistance at a sufficiently high level, has high fluidity, is excellent in workability, and is also excellent in antistatic properties. We were able to.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 23/08 C08L 25/08 C08L 67/00-67/04

Claims (8)

(57) [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 with 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 glycidyl carboxylate copolymer and / or an ethylene-unsaturated glycidyl ether copolymer. 4. The resin composition according to claim 1, wherein the styrene-maleic anhydride copolymer (C) has a number average molecular weight of 1,000 to 400,000. 5. The resin composition according to claim 1, wherein the molar ratio of styrene / maleic anhydride of component (C) is from 1/1 to 9/1. 6. The polyalkylene oxide monoalkyl ether of the component (C) 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. Component (A) 64 to 96% by weight, component (B) 3 to 30% by weight and component (C) 1 to 6% by weight (provided that component (A) + component (B) + component (C) Component = 100% by weight).