JPH0264146A - Copolyester resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition, excellent in heat resistance and rigidity and improved in low-temperature moldability in metallic molds and toughness by blending a mixture of specific two kinds of copolyesters with a reinforcing substance and metal salt of an ionic hydrocarbon copolymer as a nucleating agent. CONSTITUTION:A resin composition obtained by blending 100 pts.wt. total amount of (A) a copolyester consisting of (A1) an aromatic dicarboxylic acid consisting essentially of terephthalic acid, (A2) a glycol consisting essentially of ethylene glycol, (A3) a >=9C aliphatic dicarboxylic acid and (A4) polytetramethylene glycol with (B) a copolyester consisting of the components (A1), (A2) and (B1) polyethylene glycol with (C) 5-150 pts.wt. reinforcing substance and (D) 1-10 pts.wt. metal salt of an ionic hydrocarbon copolymer. The amounts of the components based on 100 pts.wt. total amount of the components (A1) and (A2) are respectively 0.2-20 pts.wt. components (A3) and (A4) and 0.3-50 pts.wt. component (B1).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a novel copolyester resin composition. More specifically, the present invention not only has excellent heat resistance and rigidity, but also has significantly improved low-temperature mold formability, toughness, alkali resistance, etc., and is particularly useful in the automotive field, such as engine parts that require heat resistance. The present invention relates to a copolymerized polyester resin composition that is suitably used.

[Prior Art] Polyethylene terephthalate has been widely used as a material for fibers, films, various molded products, etc. due to its excellent heat resistance, chemical resistance, mechanical properties, electrical properties, etc. When such polyethylene terephthalate is used as a molding material, it is well known that an inorganic filler such as glass fiber is added to the molded product in order to further improve the strength, rigidity, heat resistance, etc. of the molded product.

However, when such a glass fiber-reinforced polyethylene terephthalate composition is to be used for injection molding, since polyethylene terephthalate has a low crystallization rate at low temperatures, for example, when injection molded at a mold temperature of 130° C. or lower, It is difficult to obtain molded products with good crystallization, and only molded products with poor surface hardness can be obtained.Furthermore, if these molded products are used at temperatures above the secondary transition point, crystallization will progress, resulting in poor shape stability. There are problems such as defects. In addition, some methods use a method in which molding is performed at a mold temperature of around 50°C to obtain a molded product in which polyethylene terephthalate is hardly crystallized, and then heat treatment is performed, but this method reduces productivity. In addition to not being able to avoid
Molded products have drawbacks such as crystallization, volumetric shrinkage, and deformation due to heat treatment.

Therefore, molding of polyethylene terephthalate compositions is usually carried out using a special molding machine that can obtain a mold temperature of 130°C or higher, but since such a molding machine is not common, it is difficult to mold the polyethylene terephthalate composition. Mold temperature 90-110°C
There has been a desire for a polyethylene terephthalate composition that has excellent low-temperature mold moldability and can be used to obtain molded products of good quality using the following molding machine.

For this reason, various polyethylene terephthalate compositions having low-temperature crystallization effects have been proposed. For example, a method is disclosed in which a known nucleating agent is blended into polyethylene terephthalate copolymerized with polyalkylene glycol (US Pat. No. 4,548,978). However, in this method, the mold temperature 1
At temperatures below 00°C, it is not possible to obtain molded products of good quality. In addition, a composition containing sodium benzoate in polyethylene terephthalate or glass fiber-containing polyethylene terephthalate (Japanese Patent Publication No. 46-29977
(Japanese Patent Publication No. 4) and compositions containing lithium terephthalate, lithium stearate, or lithium benzoate (Japanese Patent Publication No. 4)
7-14502), and a composition in which an ionic copolymer consisting of α-olefin and σ, β-unsaturated carboxylic acid is added to polyethylene terephthalate (Japanese Patent Publication No. 45-26225) is disclosed. has been done.

However, although these compositions have improved low-temperature mold formability to some extent, it is still not sufficient.

Polyethylene terephthalate, in addition to the disadvantage of poor low-temperature molding properties, also has disadvantages of inferior toughness compared to polybutylene terephthalate 7 grade, and not necessarily sufficient alkali resistance. As a copolyester with improved toughness of polyethylene terephthalate, a copolyester made by copolymerizing polyethylene terephthalate, polyalkylene glycol, and aliphatic dicarboxylic acid has been proposed (Japanese Patent Application Laid-Open No. 1983-1999).
280221). By blending glass fiber and a nucleating agent with this copolymerized Pola ester, it is possible to obtain a material with almost the same toughness as polybutylene terephthalate, but this level of toughness is not necessarily fully satisfactory. . Furthermore, no proposals have been made so far for improving alkali resistance.

[Problems to be Solved by the Invention] Conventional glass fiber reinforced polyethylene terephthalate compositions have excellent heat resistance and rigidity, but as described above, they are inferior in low temperature moldability and toughness, and do not have sufficient alkali resistance. It has the disadvantage that it is not.

The present invention is a copolyester resin that overcomes the drawbacks of conventional glass fiber-reinforced polyethylene terephthalate, has excellent heat resistance and rigidity, and has significantly improved low-temperature mold formability, toughness, alkali resistance, etc. It was made for the purpose of providing a composition.

[Means for Solving the Problem] As a result of extensive research in order to develop a copolyester resin composition having such favorable properties, the present inventors have developed a mixture of two specific types of copolyester resin. It was discovered that the above object could be achieved by blending a reinforcing substance and a metal salt of an ionic hydrocarbon copolymer as a nucleating agent in a predetermined ratio, and based on this knowledge, the present invention was completed. reached.

That is, the present invention provides (a) aromatic dicarboxylic acid units mainly composed of terephthalic acid units, (b) glycol units mainly composed of ethylene glycol units, (c) aliphatic dicarboxylic acid units having 9 or more carbon atoms, and ( d) Contains polytetramethylene glycol units, and 0.2 to 20 (c) units per 100 parts by weight of the total amount of the (a) units and (b) units.
a copolymerized polyester (A) containing 0.2 to 20 parts by weight of the (d) unit, and the (a) unit, (
A copolymerized polyester containing b) units and (e) polyethylene glycol units, and containing 0.3 to 50 parts by weight of (e) units per 100 parts by weight of the total amount of (a) units and (b) units. B), a reinforcing substance (C) and a metal salt of an ionic hydrocarbon copolymer (D); b) per 100 parts by weight of the total amount of units (c) 0.3 to 10 parts by weight, (d) 0 units
．． 3-10 parts by weight, (e) unit is 0.5-20 parts by weight, and the total amount of copolymerized polyesters (A) and (B) is 10
0 parts by weight, the reinforcing substance (C) is 5 to 150 parts by weight and 11 parts by weight, and the metal salt of the ionic hydrocarbon copolymer (D) is 1-1 parts by weight.
The object of the present invention is to provide a copolymerized polyester resin composition characterized in that 0 parts by weight of the copolymerized polyester resin is blended.

The present invention will be explained in detail below.

In the composition of the present invention, the (a) unit in the copolymerized polyester used as the component (A) and the component (B) is an aromatic dicarboxylic acid unit mainly consisting of a terephthalic acid unit; Constituent monomers include terephthalic acid and terephthalic acid and 10 mol%
Mention may be made of mixtures with less than or equal to other aromatic dicarboxylic acids. Other aromatic dicarboxylic acids include isophthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-1,5-dicarboxylic acid, diphenyl-4,4''-dicarboxylic acid, methylterephthalic acid, methylisophthalic acid,
Diphenyl ether-4,4'-dicarboxylic acid, diphenylthioether-4,4'-dicarboxylic acid, diphenylsulfone-4,4'-dicarboxylic acid, diphenylketone 4,4'-dicarboxylic acid, 2,2-diphenylpropane-4 , 4'-dicarboxylic acid and the like. These aromatic dicarboxylic acids other than terephthalic acid are 1
A species may be used, or two or more species may be used in combination.

In the copolymerized polyester used as component (A) and component (B), the monomers constituting the (b) unit, that is, the glycol unit mainly composed of ethylene glycol units, are less than 10 mol% of ethylene glycol and ethylene glycol. Mention may be made of mixtures of with other glycols. Examples of other glycols include diethylene glycol, 1,2-propylene glycol, 1.3
-propanediol, 1,3-butanediol, l, 4
-7'tanediol, 1,5-bentanediol, 1.
6-hexanediol, 2.2-dimethyl-1,3-propanediol (neopentyl glycol), 1.4-
Examples include aliphatic or alicyclic glycols such as cyclohexane diol and 1,4-cyclohexane dimetatool, and aromatic diols such as hydroquinone, resorcinol, and bisphenols. Furthermore, oxybenzoic acid,
Oxycarboxylic acids such as oxycaproic acid and hydroxyethoxybenzoic acid may be copolymerized. One type of glycol other than these ethylene glycol may be used,
You may use two or more types in combination.

The (C) unit of the (A) component copolymerized polyester, that is, the monomer constituting the aliphatic dicarboxylic acid unit having 9 or more carbon atoms, may be linear or branched. or may partially form a ring. Examples of such aliphatic dicarboxylic acids having 9 or more carbon atoms include linear dicarboxylic acids such as azelaic acid, sebacic acid, decanedicarboxylic acid, brassylic acid, dodecanedicarboxylic acid, hexadecanedicarboxylic acid, and eicosanedicarboxylic acid; and dimer acids and their water additives.

Furthermore, ester-forming derivatives of these dicarboxylic acids can also be used. One kind of these aliphatic dicarboxylic acids and their ester-forming derivatives may be used, or two or more kinds thereof may be used in combination.

Among the aliphatic dicarboxylic acids, dimer acids and dimer acid hydrogenated products are particularly preferred. This dimer acid is obtained from unsaturated fatty acids having 18 carbon atoms such as linoleic acid and lyluic acid, or their -valent alcohol esters, and the main component is dimer acid having 36 carbon atoms, but -basic acids and It also contains some trimer acids. In order to effectively achieve the object of the present invention, a dimer acid with a low content of -basic acid and trimer acid is preferred.

The content of the (c) unit in the (A) component copolymerized polyester is 0.2 to 20 parts by weight, preferably 0.5 to 20 parts by weight, per 100 parts by weight of the total amount of units (a) and (b).
The amount is selected within the range of 15 parts by weight.

If this content is less than 0.2 parts by weight, the effect of improving toughness will not be sufficiently exhibited, and if it exceeds 20 parts by weight, the melting point of the copolymerized polyester obtained will decrease and the rigidity will also tend to be impaired.

The toughness of the copolyester can also be improved by modification with polytetramethylene glycol or polyethylene glycol, which will be described later, but the toughness can be dramatically improved by modification with the aliphatic dicarboxylic acid having 9 or more carbon atoms. do. This effect is not achieved with aliphatic dicarboxylic acids having less than 9 carbon atoms. There is no particular restriction on the upper limit of the number of carbon atoms in the aliphatic dicarboxylic acid having 9 or more carbon atoms, but those having up to 50 carbon atoms are usually used.

The reason why the toughness of copolyesters obtained by modification with aliphatic dicarboxylic acids having 9 or more carbon atoms is dramatically improved is not necessarily clear at present, but for example, when polytetramethylene glycol is When copolymerized with terephthalate, a polymerization reaction product with a coarse phase-separated structure is obtained, whereas when copolymerized with an aliphatic dicarboxylic acid having 9 or more carbon atoms, a fine particle-like product is obtained. It has been confirmed through transmission electron microscopy using osmic acid staining that the polymerization reaction product changes to a dispersed structure, and this change in phase separation morphology is thought to be related to the dramatic improvement in toughness. Presumed.

In the component (A) copolymer polyester, the polytetramethylene glycol constituting the unit (d) has a number average molecular weight of 400 to 4000, preferably 600 to 200.
A value in the range of 0 is preferred. If this molecular weight deviates from the above range, the rigidity of the resulting copolyester may decrease.

The content of the polytetramethylene glycol unit (d) is 0.2 to 20 parts by weight, preferably 0.5 to 15 parts by weight, per 100 parts by weight of the total amount of the units (a) and (b).
You need to choose within the weight range. If the content is less than 0.2 parts by weight, the effect of improving toughness and crystallinity at low temperatures will not be sufficiently exhibited, and if it exceeds 20 parts by weight, the melting point and rigidity of the copolyester will tend to decrease.

In the copolymerized polyester as component (B), the polyethylene glycol constituting the unit (e) preferably has a number average molecular weight in the range of 400 to 4,000, preferably 600 to 2,000.

If this molecular weight deviates from the above range, the rigidity of the resulting copolyester may decrease.

The content of the polyethylene glycol unit (e) is selected in the range of 0.3 to 50 parts by weight, preferably 1 to 30 parts by weight, per 100 parts by weight of the total amount of the units (a) and (b). There is a need.

If this content exceeds 50 parts by weight, the copolyester will have increased stickiness and will be inconvenient in handling.

In addition, the polyethylene glycol unit (e) is (A
) It can also be contained in the copolymerized polyester of the component. In this case, the content of (e) polyethylene glycol units is 100% of the total amount of the units (a) and (b).
It is appropriate that the amount per part by weight is 20 parts by weight or less, preferably 15 parts by weight or less.

In addition, when producing the copolymerized polyester of component (A) or the copolymerized polyester of component (B), in addition to the above-mentioned components, a small amount of other copolymerized components, such as glycerin, may be added to the extent that the object of the present invention is not impaired. , trimethylolpropane, pentaerythritol, hexanetriol, 1,2.6
Triols and tetraols such as -1-limethylolethane, benzenetricarboxylic acids and benzenetetracarboxylic acids such as trimellitic acid, trimesic acid, and pyromellitic acid, p-hydroxybenzoic acid, p~hydroxyethynebenzoic acid, or 3 Polyfunctional monomers such as hydroquinocarboxylic acids such as compounds having ~4 hydroxyl groups and carboxyl groups, as well as aliphatic monocarboxylic acids such as stearic acid and oleic acid, benzoic acid, phenylacetic acid,
Monofunctional additives such as aromatic monocarboxylic acids such as diphenylacetic acid and β-naphthoic acid can also be used in combination.

In the composition of the present invention, the method for producing the copolyester used as the component (A) and the component (B) is not particularly limited, and can be produced by any known method. Usually, the copolymerized polyester is prepared by first heating a mixture of the reactants and a catalyst in the presence or absence of a catalyst at atmospheric or pressurized pressure, preferably under an inert gas atmosphere to form an oligomer. It is obtained by polycondensing. In this case, the acid component of the thickener may be used in the form of an ester-forming derivative. In addition, the reaction temperature when forming oligomers is usually 200 to 270°C.
, preferably in the range of 230 to 260°C. The polycondensation reaction of the oligomer is usually carried out in the presence of a known catalyst such as antimony titanium, iron, zinc, cobalt, lead, manganese, germanium, etc. at a temperature of 15 mrnHg or less,
Preferably at a pressure of 1 mmH9 or less, 270-
It is carried out at a temperature of about 300°C.

(A) Aliphatic dicarboxylic acid constituting the (e) unit in the component copolyester, polytetramethylene glycol constituting the (d) unit, and polyethylene glycol constituting the (e) unit in the component (B) copolyester There is no particular restriction on the timing of addition, and it can be added at any stage during the production of the copolyester. For example, it may be added at the stage of esterification or transesterification, or at the stage of polycondensation,
Alternatively, it may be added after polycondensation, and the polycondensation may be continued briefly to complete the reaction.

The intrinsic viscosity of the thus obtained copolymerized polyesters of component (A) and component (B) was determined at a temperature of 30°C.
0.4 to 1.5 when measured in a phenol/tetrachloromethane mixed solvent (weight ratio 1/1)
dn/y, preferably 0.5-1. It is desirable that it be in the range of OdQ/y.

In the composition of the present invention, there is no particular limitation on the ratio of the above-mentioned (A) component copolyester and (B) component copolyester; In a composition consisting of a copolymerized polyester, the total amount of the units (a) and (b) is 1
00 parts by weight, c) units are 0.3 to 10 parts by weight, preferably 0.5 to 5 parts by weight, and (d) units are 0.3 to 10 parts by weight.
parts by weight, preferably 0.5 to 5 parts by weight, and 0.5 to 20 parts by weight, preferably 1 to 15 parts by weight, particularly preferably 1 to 12 parts by weight of the (e) unit. Usually, the component (A) is 30 to 95% by weight, and the component (B) is 70 to 95% by weight.
It may be blended in a proportion of 5% by weight.

In the composition of the present invention, examples of reinforcing substances used as component (C) include glass fibers, carbon fibers, graphite fibers, metal carbide fibers, metal nitride fibers, potassium titanate fibers, aramid fibers, and phenolic resin fibers. Examples include fibrous reinforcing materials, talc, clay, kaolin, mica, asbestos, wollastonite, calcium silicate, silica, stone collagen, graphite, and other inorganic fillers, and these may be used alone or , two or more types may be used in combination. Among these, fibrous reinforcing materials are preferred, and glass fibers and carbon fibers are particularly preferred.

When using the fibrous reinforcing material, the length in the composition is preferably 0.02 to 2 mm, more preferably 0.02 to 2 mm.
A diameter in the range of 0.05 to 1 mm is suitable, and a diameter of about 1 to 20 μm is usually sufficient. There is no particular restriction on the form of the fibrous reinforcing material, and any form such as roving, milled 7-iva, chopped strand, whisker, etc. can be used.

Furthermore, the reinforcing substances include, for example, a silane camping agent, a titanate coupling agent, a chromium coupling agent, a silica powder, a silicone oil, a higher fatty acid,
It may be surface-treated with higher alcohol, wax, etc., or it may be bound with epoxy resin or the like.

The reinforcing substance of component (C) is 5 to 150 parts by weight, preferably 10 to 120 parts by weight, based on 100 parts by weight of the copolyester of component (A) and copolyester of component (B). It is necessary to mix it in the ratio of 1 part. If this amount is less than 5 parts by weight, the mechanical strength will be insufficient.
Rigidity and heat resistance cannot be obtained, and if the amount exceeds 150 parts by weight, no improvement in mechanical strength, rigidity, heat resistance, etc. is observed considering the amount, and rather the appearance and fluidity tend to deteriorate.

In the composition of the present invention, a metal salt of an ionic hydrocarbon copolymer is blended as component (D).

The ionic hydrocarbon copolymer is not particularly limited, and examples include ethylene, propylene, butylene, styrene,
Olefins such as α-methylstyrene and acrylic acid,
Copolymers with unsaturated carboxylic acids such as methacrylic acid and maleic acid and unsaturated carboxylic acid anhydrides such as maleic anhydride can be used. In addition, the metal ion species constituting the metal salts of these ionic hydrocarbon copolymers include, for example, alkali metal ions such as sodium ions and potassium ions, alkaline earth metals such as magnesium ions, calcium ions, and barium ions. Examples include various types of ions, such as aluminum ions and zinc ions.

As the metal salt of the ionic hydrocarbon copolymer, one having a melt index (Ml) of 50 g/10 minutes or less is usually used. Preferred metal salts of ionic hydrocarbon copolymers include sodium salts or potassium salts of copolymers of ethylene and acrylic acid or methacrylic acid having an MI of 0.5 to lo9/lo minutes.

The metal salt of the ionic hydrocarbon copolymer has an action as a crystallization accelerator for the copolyester, and its amount is equal to that of the copolyester (A) and (B).
It is selected in an amount of 1 to 10 parts by weight, preferably 2 to 8 parts by weight, based on 100 parts by weight of the total amount of the component and the copolymerized polyester. If the amount is less than 1 part by weight, the effect as a crystallization accelerator of the copolymerized polyester will not be sufficiently developed, and if it exceeds 10 parts by weight, the crystallization accelerator effect will not improve in proportion to the amount, but rather Mechanical strength and heat resistance decrease,
In addition, there is a risk that liquidity may deteriorate.

If desired, other crystallization promoters, fluidity modifiers, waxes as release agents, etc. may be added to the composition of the present invention, and further antioxidants, ultraviolet absorbers, flame retardants, etc. Even if various additives such as impact modifiers, colorants, etc. are added, it will not be sharp. As the antioxidant, in order to improve both the stability during processing and the stability of the molded article, it is preferable to use a 71-nol antioxidant and a phosphorus antioxidant in combination.

There are no particular limitations on the method for preparing the composition of the present invention, and any method can be used. For example (A) and (B
) A method in which each of the copolymerized polyesters of the components (C) and (D) are mixed in advance and compounded using an extruder or the like, and after melt-kneading the (D) component to each copolymerized polyester, A method of blending the reinforcing substance of component (C), a method of adding the reinforcing substance of component (C) at the polymerization stage or after the polymerization of each copolyester, and then mixing the component (D) therewith, (C) Compounded copolymerization Polyester and (D)
A method of blending a component blended copolymerized polyester, etc. can be used. [Example] Next, the present invention will be explained in more detail with reference to an example.
The present invention is not limited to these examples in any way.

The properties of the composition were evaluated as follows.

(1) Mold releasability (thin wall) Evaluation was made based on the ease of mold release of a box-shaped molded product with a wall thickness of 0.5 mm.

○: Good, △: Slightly good, ×: Poor (2) Surface gloss The opposite side of the dumbbell test piece is Measured in accordance with JISK-7105.

(3) Physical properties Bending strength: Measured according to ASTM D-638 Bending strain at break: Measured according to ASTM D-790 Bending modulus: Measured according to ASTM D-790 Izot impact strength: ASTM D- Measured in accordance with 256 (with and without notches) Heat distortion temperature (high load): Measured in accordance with ASTM D-648 (4) Chemical resistance (alkali resistance) In a 10% by weight aqueous sodium hydroxide solution, The bending test pieces were immersed at room temperature for 7 days, and changes from before immersion were expressed in terms of bending strength retention, weight change rate, and appearance change.

Production Example 1 Production of Copolymerized Polyester A After stirring a slurry consisting of 687 g of copolymerized polyester A, 389 g of ethylene glycol, 5 g of phosphorous acid, and 0.034 g of antimony trioxide, a reaction was carried out using a rectification column and a cooling pipe for water distillation. Gradually and continuously fill the container with 2.6 kg7
The esterification reaction was carried out at 250 to 255°C under a pressure of cm"-G. Then, this esterified product 1O
Polytetramethylene glycol 39 with a number average molecular weight of 860 and 3 g of dimer acid were added to O9, and after reacting at 250°C for 10 minutes under normal pressure, l mm
The condensation reaction was carried out at 275°C under a high vacuum of H9 or less, and the polycondensation reaction was terminated when the intrinsic viscosity [l] reached 0.71 dfl/9, to obtain copolymerized polyester A.

Production Example 2 Production of copolymerized polyester B Terephthalic acid B 79, ethylene glycol 359, phosphorous acid 0.0059, and antimony trioxide 0.0349
After stirring the slurry consisting of
/ cm2-G pressure, 250-255°C
An esterification reaction was carried out. Next, this esterified product 1
009 was added with 30 g of polyethylene glycol with a number average molecular weight of 1000, and heated at 250°C under normal pressure.
After reacting for 0 minutes, the condensation reaction proceeded under a high vacuum of 1 mmHy or less, and polycondensed polyester B was obtained when the intrinsic viscosity [i] reached 0.80 dl/g.

Examples 1 to 8, Comparative Examples 1 to 4 The copolymerized polyester, PET, or PBT obtained in the production example was pre-dried at 140°C for 5 hours or more, and for 100 parts by weight, a Glass chopped strands and sodium salt of ethylene/methacrylic acid copolymer [Himilan 1707, manufactured by DuPont Mitsui Polychemicals Co., Ltd.] in the proportions shown in Table 1, and a phenolic antioxidant (manufactured by Ciba-Geigy, trade name: 0.3 parts by weight of Irganox 1010) and 0.3 parts of a phosphorous antioxidant (manufactured by Adeka Argus, trade name PEP-36).
After preliminary kneading using parts by weight, the mixture was melt-kneaded and pelletized at a cylinder temperature of 270°C in a 57 mm twin-screw extruder equipped with one pen.

Next, the obtained pellets were pre-dried at 140°C for 5 hours or more, and then using an injection molding machine, the cylinder temperature was 270°C, the mold temperature was 90'C! A test piece was prepared and its characteristics were evaluated. The results are shown in Table 1.

(The following is a blank space) [Effects of the Invention] As explained above, the copolymerized polyester resin composition of the present invention maintains the excellent heat resistance and rigidity inherent to the glass fiber reinforced polyethylene terephthalate composition, and can also be used in low-temperature molding. It has greatly improved moldability, toughness, alkali resistance, etc., and is particularly suitable for use in the automobile field, such as engine parts that require heat resistance.

Patent applicant: Idemitsu Petrochemical Co., Ltd.

Claims (1)

[Claims] 1 (a) aromatic dicarboxylic acid units mainly consisting of terephthalic acid units, (b) glycol units mainly consisting of ethylene glycol units, (c) aliphatic dicarboxylic acid units having 9 or more carbon atoms, and (d) polytetramethylene Contains glycol units, and contains 0.2 to 20 parts by weight of (c) units and 0.2 to 20 parts by weight of (d) units per 100 parts by weight of the total amount of units (a) and (b). copolymerized polyester (A), and the (a) units, (b) units, and (e)
Contains polyethylene glycol units, and contains 0.0 units of (e) per 100 parts by weight of the total amount of units (a) and (b).
Copolymerized polyester containing 3 to 50 parts by weight (B
), a reinforcing substance (C), and a metal salt of an ionic hydrocarbon copolymer (D), in a composition of a copolymerized polyester (A) and a copolymerized polyester (B), the (a) unit and the (b) ) Units per 100 parts by weight (c) 0 units
．． 3 to 10 parts by weight, (d) unit is 0.3 to 10 parts by weight,
(e) The unit is 0.5 to 20 parts by weight, and the reinforcing substance (C) is 5 to 150 parts by weight per 100 parts by weight of the copolymerized polyester (A) and (B), and the ionic hydrocarbon copolymer A copolyester resin composition characterized in that 1 to 10 parts by weight of a coalescent metal salt (D) is blended.