JP2000143950A - Polyester elastomer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester elastomer composition with high mechanical strengths, heat resistance and hydrolysis resistance, low in volatility when heated, and slight in gel content. SOLUTION: This thermoplastic polyester elastomer composition comprises (a) 100 pts.wt. of a polyester-type block copolymer, (b) 0.1-10 pts.wt. of a bifunctional or higher functional compound satisfying the chain extender heating loss defined by the relationship: (W1-W2)/W1<=0.1 (wherein W1 is sample weight before heat treatment; W2 is sample weight after heat treatment at 200 deg.C for 30 min) and having functional groups reactive with the terminals of the component (a), and (c) 0.1-5 pts.wt. of a stabilizer with a tertiary amine representing part of the skeleton.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester elastomer composition which is excellent in mechanical properties and durability, has low volatility upon heating, and has little gelling.

[0002]

2. Description of the Related Art As a method for producing a polymer obtained by reacting an aromatic polyester with a lactone, a method comprising reacting a crystalline aromatic polyester with a lactone (Japanese Patent Publication No. 48-4116)
JP-A-48-4115), a method of reacting a crystalline aromatic polyester with a lactone, and reacting the resulting block initial copolymer with a polyfunctional acylating agent to extend the chain (JP-B-48-4115). Method of polymerizing lactones in the solid state in the presence of polyester (Japanese Patent Publication No. 52-49037)
Etc. are known.

[0003] The polymers obtained by these methods have excellent rubber-like elasticity while being thermoplastic.
However, heat resistance is insufficient, and there is a problem that strength and elongation are significantly reduced when exposed to high temperature for a long time. Furthermore, these polymers have poor water resistance and are prone to hydrolysis in the presence of water. Therefore, it is difficult to use these compositions as they are as raw materials such as fibers, films, and molding materials.

Therefore, in order to improve the heat resistance and water resistance of the above-mentioned polyester type block copolymer, 1
A method of blending a functional or higher epoxy compound (JP-A-58-1
No. 62654) has been proposed. By this method, heat resistance and water resistance are improved. Furthermore, a method has been reported in which the volatility during heating is improved by limiting the type of epoxy compound used (Japanese Patent Application Laid-Open No. 10-30053).

[0005] Also, in a polyester type block copolymer obtained by copolymerizing a crystalline aromatic polyester and a polyalkylene glycol such as polytetramethylene glycol, a method of blending an epoxy compound to improve mechanical properties has been proposed. May be taken.

Although the heat resistance and hydrolyzability of the resin are improved and the volatility during heating can be suppressed by blending the epoxy compound as described above, depending on the application, the resin may be exposed to a severe use environment. It is common to add stabilizers such as inhibitors and light stabilizers. However, if the type and amount of the stabilizer are inappropriate, the compounding of the stabilizer not only cannot improve the properties, but also has an adverse effect such as a decrease in mechanical properties due to poor affinity with the resin. Also, in the compounding step of the polyester type block copolymer, the epoxy compound and the stabilizer in the extruder, a gelled product is generated, which causes problems such as clogging of the filter and impairing the appearance of the molded product. Is required.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a thermoplastic polyester elastomer composition having excellent heat resistance and hydrolysis resistance, less volatility upon heating, and less gelation. Is to do.

[0008]

The thermoplastic polyester elastomer composition according to the present invention, which can solve the above-mentioned problems, comprises a chain extender based on 100 parts by weight of a polyester type block copolymer (a). Compound (b) which is a bifunctional or more functional compound having a heating loss rate satisfying the following formula (I) and whose functional group can react with the terminal group of the above (a).
A thermoplastic polyester elastomer composition comprising 1 to 10 parts by weight and 0.1 to 5 parts by weight of a stabilizer (c) in which a tertiary amine is part of a skeleton. (W1-W2) /W1≦0.1 (I) where, W1: sample weight before heat treatment W2: sample weight after heat treatment at 200 ° C. for 30 minutes

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester type block copolymer in the present invention is a copolymer comprising a high melting point hard polyester segment and a low melting point polymer segment having a molecular weight of about 400 to 6000. The melting point when forming a high polymer only with the components is 150 ° C. or higher, and the heat called a polyester elastomer consisting of the components having a melting point or softening point of 80 ° C. or lower when measured only with the low melting polymer segment constituent components. It is a plastic polyester type block copolymer.

The polyester type block copolymer will be described in more detail. For example, terephthalic acid, isophthalic acid, 1,1,
An aromatic dicarboxylic acid such as 5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, bis (4-carboxyphenyl) methane, bis (4-carboxyphenyl) sulfone or an ester thereof; Ethylene glycol, propylene glycol, tetramethylene glycol, pentamethylene glycol, 2,2-dimethyltrimethylene glycol, hexamethylene glycol, decamethylene glycol, p-
Polyesters produced from diols such as xylylene glycol and cyclohexanedimethanol, or oxyacids such as co-polyester p- (β-hydroxyethoxy) benzoic acid using two or more of these dicarboxylic acids or two or more diols; Polyesters derived from these esters, 1,2-bis (4,4 ′
-Dicarboxyphenoxy) ethane and other aromatic ether dicarboxylic acids and the above-mentioned diols, crystalline aromatic polyesters such as polyether esters, polylactones such as polypivalolactone, and more dicarboxylic acids and oxy acids. And diols in combination.

Examples of the low melting point polymer segment having a molecular weight of 400 to 6000 include polyalkylene ether glycols such as poly (ethylene oxide) glycol, poly (propylene oxide) glycol, poly (tetramethylene oxide) glycol, and mixtures thereof. Further, copolymerized polyether glycols obtained by copolymerizing these polyether glycol constituents can be shown. Polyesters prepared from aliphatic dicarboxylic acids having 2 to 12 carbon atoms and aliphatic glycols having 2 to 10 carbon atoms, for example, polyethylene adipate, polytetramethylene adipate, polyethylene sebacate, polyneopentyl sebacate, polytetramethylene dodeca And polylactones represented by poly-methylene azelate, polyhexamethylene azelate and poly-ε-caprolactone. Further, a polyester polyether copolymer obtained by combining the above polyester and polyether can also be shown. The proportion of the low melting point polymer segment constituting component in the polyester type block copolymer is preferably from 5 to 80% by weight.

Among these, those obtained by reacting a crystalline aromatic polyester with a lactone are compounds having a functional group capable of reacting with the terminal of the polyester in order to achieve a high degree of function as an elastomer. It is essential to increase the molecular weight by reacting,
The amount of the compound having a functional group capable of reacting with the terminal of the polyester is increased, and problems due to volatilization and problems due to gelation are likely to occur.

Preferred examples of the crystalline aromatic polyester used here include a polymer mainly composed of an ester bond or an ester bond and an ether bond, wherein at least one aromatic group is a main repeating unit, and Those having a hydroxyl group at the terminal are used. This crystalline aromatic polyester has a melting point of 15
Those having a temperature of 0 ° C. or higher, the preferred molecular weight varies depending on the application.When used as a molding material, the molecular weight is 5,000 or more, more preferably 8,000 or more.When used as an adhesive or a coating agent, the molecular weight is 5,000. It is as follows.

Preferred specific examples of the crystalline aromatic polyester include polyethylene terephthalate, polytetramethylene terephthalate, poly-1,4-cyclohexylene dimethylene terephthalate, polyethylene-2,6-naphthalate, and polybutylene-2,6-naphthalate. Homopolyesters such as polyethylene oxybenzoate,
Polyester ethers such as poly-p-phenylenebisoxyethoxy terephthalate; mainly consisting of tetramethylene terephthalate units or ethylene terephthalate units, and additionally tetramethylene or ethylene isophthalate units, tetramethylene or ethylene adipate units, tetramethylene or ethylene sebacate units And copolymerized polyesters or copolymerized polyester ethers having a copolymer component such as 1,4-cyclohexylene dimethylene terephthalate unit, tetramethylene or ethylene-p-oxybenzoate unit. In the case of a copolymer, the content of tetramethylene terephthalate or ethylene terephthalate unit is preferably 60 mol% or more. As the lactones, caprolactone is most preferred, but as the other, enanlactone, caprylolactone and the like can also be used, and two or more of these lactones can be used in combination.

The copolymerization ratio of the above-mentioned crystalline aromatic polyester and lactone can be appropriately changed depending on the use. Generally, as the proportion of the crystalline aromatic polyester increases, the resulting composition becomes harder and the mechanical properties such as strength and elongation are improved. When the proportion of lactones increases,
The resulting composition softens and has improved low temperature properties. Therefore, the copolymerization ratio of the two can be selected according to the application while considering the balance between the mechanical strength and the low-temperature characteristics. As a standard blending ratio, aromatic polyester / lactones are 97/3 to 5/95 by weight, more generally 95/5 to 30/7.
It is in the range of 0. When it is desired to obtain a hard molded product, the above ratio is preferably selected from the range of 95/5 to 70/30.

Next, as the compound having two or more functional groups which can be used in the present invention and whose functional group can react with the terminal group of the polyester type block copolymer, the following compounds can be used. As long as the compound satisfies the formula (I) and has two or more in the same core, the structure is not limited at all. (W1-W2) /W1≦0.1 (I) where, W1: sample weight before heat treatment W2: sample weight after heat treatment at 200 ° C. for 30 minutes

The loss on heating of the chain extender is determined as follows. Approximately 5 g of a chain extender stored in a desiccator containing silica gel at 25 ° C. for 1 week or more was collected in a glass weighing bottle (W′g) having a diameter of 6 cm × a height of 3 cm and having a known weight, and the weighing bottle was precisely weighed ( W0 '), then keep the bottle open for 30 minutes at 200 ° C
In a hot air dryer. After cooling, the weight is precisely weighed (W1 ′) together with the weighing bottle, and the heating loss rate is calculated by the following equation. Sample weight before heat treatment (W1 = W0'-W ') Sample weight after heat treatment (W2 = W1'-W') Loss on heating of chain extender = (W0'-W1 ') / (WO'-W')

Specific examples include bisphenol A-diglycidyl ether, bisphenol F-diglycidyl ether, bisphenol S-diglycidyl ether, cresol novolak type glycidyl ether, phenol novolak type glycidyl ether, polycarbodiimide, bisoxazoline compounds and the like. Can be Particularly preferred examples include bisphenol A-diglycidyl ether, bisphenol F-diglycidyl ether, bisphenol S-diglycidyl ether compound, and the like.

The amount of the compound having two or more functionalities may vary depending on the amount of the functional group present at the terminal of the polyester type block copolymer to be used or the required properties of the finally obtained composition. Preferably 0.1 parts by weight or more based on 100 parts by weight of the polyester type block copolymer.
It is 10 parts by weight, more preferably 0.3 parts by weight to 8 parts by weight, still more preferably 0.5 parts by weight to 6 parts by weight. If less than 0.1 part by weight, the effect obtained by reacting such a compound, for example, the effect of improving the moldability by thickening,
The effect of improving heat resistance and hydrolysis resistance is not significantly exhibited. If the amount exceeds 10 parts by weight, the unreacted compound remains, resulting in an adverse effect on the quality of the molded product, such as rough surface properties of the molded product.

In the composition of the present invention, the reaction between the polyester-type block copolymer and a compound having two or more functional groups in the same molecule that reacts with the terminal group of the polyester-type block copolymer can be carried out without using a catalyst. However, it is desirable to use a catalyst from the viewpoint of accelerating the reaction or improving the affinity. As the catalyst, generally, amines,
Examples thereof include phosphorus compounds and metal salts of Group Ia or Group IIa selected from the periodic table of the elements, such as monocarboxylic acids and / or dicarboxylic acids having 10 or more carbon atoms. Of these, trivalent phosphorus compounds such as tributylphosphine and triphenylphosphine; and stearic acid metal salts such as calcium stearate and sodium stearate are preferred. These catalysts can be used alone or in combination of two or more. Further, the same effect can be obtained whether the above-mentioned catalyst is added all at once or dividedly, and the addition amount of the catalyst is usually 3 parts by weight based on 100 parts by weight of the polyester-type block copolymer. Hereinafter, it is preferably 0.03 to 2 parts by weight.

The structure of the stabilizer used in the present invention is not particularly limited as long as the amine moiety contained in the skeleton of the stabilizer is tertiary. The primary amine moiety is a cyclocyclic 1
In particular, those having a hindered amine, benzophenone, or benzotriazole structure are preferable.

If the amine of the stabilizer is less than tertiary, or if a primary or secondary amine stabilizer is used, a gel is formed in the polyester elastomer, and the filter of the extruder is clogged or the appearance of the molded product is impaired. Problems occur. This is thought to be because primary or secondary amines are incorporated into epoxy resins and crosslink epoxy resin molecules, as is known as curing agents for epoxy resins.

The amount of the stabilizer added can be appropriately changed depending on the use of the elastomer. Generally, it is necessary to increase the addition amount for applications requiring higher stability.However, if the addition amount is too high, the stabilizer will precipitate during molding, contaminate the molding die or accumulate in the polymer channel. This causes inconvenience in molding. In addition, even after being processed as a molded article, it may precipitate on the surface of the molded article during use, resulting in poor appearance or hygiene problems. Therefore, the addition amount is suitably in the range of 0.1 to 5 parts by weight, and more preferably 0.3 to 3 parts by weight.

The above-mentioned stabilizers can be used alone or in combination with other general stabilizers. Examples of the stabilizers that can be used together include phenol-based, amine-based, phosphorus-based, thioether-based, and metal salt-based stabilizers. Is mentioned. In the present invention, it is desirable to select a compound with low volatility as a stabilizer from the viewpoint of balancing volatility and mechanical properties, heat resistance, and hydrolysis resistance.

The thermoplastic polyester elastomer composition of the present invention may further contain a fibrous reinforcing material and / or an inorganic filler, if necessary. By blending the polyester-type block copolymer in an amount not exceeding 100 parts by weight with respect to 100 parts by weight, it is possible to improve strength, rigidity, heat resistance, dimensional stability and the like. Examples of the fibrous reinforcing material include inorganic fibers such as glass fiber, silica glass fiber, alumina fiber, gypsum fiber, ceramic fiber, and asbestos fiber; whiskers such as calcium titanate whisker and zinc oxide whisker; and carbon fibers. As inorganic fillers, talc, wollastonite, kaolin, mica, sericite, clay, alumina silicate, glass beads, milled glass fiber,
Examples include calcium carbonate and silica.

Further, the thermoplastic polyester elastomer composition of the present invention may contain a flame retardant as required. Flame retardancy can be improved by blending the polyester-type block copolymer in an amount not exceeding 100 parts by weight with respect to 100 parts by weight. Examples of the flame retardant include halogen-based, phosphorus-based, melamine-based organic additives, and inorganic additives such as metal hydroxides. If necessary, a flame retardant aid such as antimony oxide or a boron compound may be added.

The composition of the present invention may contain a conventionally known crystallization accelerator, crystal nucleus material, antioxidant, ultraviolet absorber, plasticizer, lubricant, flame retardant, flame retardant, etc. Agent,
An antistatic agent, a conductivity improving agent, a hydrolysis resistance improving agent, a polyfunctional crosslinking agent, an impact resistance improving agent, a metal deterioration preventing agent, a coloring agent, and the like can be blended. Also, unless the purpose of the present invention is impaired,
Other types of resins such as polyesters, polyamides, polyolefins, polyurethanes can also be blended.

The method for producing the composition of the present invention is not particularly limited, and any method can be used. For example, the desired composition can be obtained by heating and kneading with an extruder, a roll mill, a Banbury mixer, or the like.

Hereinafter, the structure, operation, and effects of the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples, and the scope of the present invention is not limited thereto. The present invention can be modified and implemented, and all of them are included in the technical scope of the present invention.

In the present invention, unless otherwise specified.
All "parts" represent parts by weight.

BEST MODE FOR CARRYING OUT THE INVENTION

(Production Example 1) Preparation of Polyester Block Copolymer 70 kg of polytetramethylene terephthalate and 30 kg of ε-caprolactone were placed in a reaction vessel, purged with nitrogen gas, and then melt-reacted for 2 hours while stirring at 230 ° C. so,
A polyester-type block copolymer chip was obtained. The resulting polyester type block copolymer has a reduced specific viscosity.
It was 1.163, the acid value was 65 equivalents / 10 ⁶ g, the tensile strength at break was 370 kg / cm ² , and the tensile elongation at break was 710%.

(Production Example 2) Preparation of polyester-type block copolymer 40 kg of dimethyl terephthalate, 25 of 1,4-butanediol 25
kg and 75 g of tetrabutyl titanate were placed in a reaction vessel, and after purging with nitrogen gas, transesterification was carried out according to a conventional method. When the transesterification rate reached 95% or more, 32 kg of polytetramethylene glycol having a molecular weight of 1000 was added and mixed, then transferred to an autoclave, and subjected to a polycondensation reaction at 250 ° C. for 140 minutes, and a polyester-type block copolymer chip was obtained. I got The obtained polyester type block polymer is
Reduced specific viscosity of 1.211, an acid value of 34 eq / 10 ⁶ g,
The tensile strength at break was 310 kg / cm ² , and the tensile strength at break was 550%.

Example 1 100 parts by weight of the polyester type block copolymer obtained in Production Example 1, 3.5 parts by weight of bisphenol F-diglycidyl ether as a bifunctional or more compound, and a tertiary amine skeleton 1- [2- {3- (3,5-di-T-butyl-4-hydroxyphenyl) propionyloxy} ethyl] -4 as a stabilizer having
-{3- (3,5-di-T-butyl-4-hydroxylphenyl) propionyloxy} -2,2,6,6-tetramethylpiperidine (Sanol LS2626 manufactured by Sankyo)
The mixture was placed in a weight part drum tumbler and stirred at room temperature for 30 minutes. The mixture was extruded at 230 ° C. using a 40 mmφ co-directional twin-screw extruder, cooled with water, and cut into chips. The resulting chips
After drying under reduced pressure at 100 ° C., chips of the polyester elastomer composition of the present invention were obtained.

(Example 2) According to the compounding amount in Table 1, Example 1
In the same manner as in the above, chips of the polyester elastomer composition of the present invention were obtained. The amounts of stabilizer A and bisphenol F-diglycidyl ether were changed.

(Example 3) According to the compounding amount in Table 1, Example 1
In the same manner as in the above, chips of the polyester elastomer composition of the present invention were obtained. A commonly used hindered phenolic stabilizer was added.

Example 4 A chip of a polyester elastomer composition was obtained in the same manner as in Example 1 except that the polyester type block copolymer obtained in Production Example 2 was used.

(Comparative Example 1) A chip of the polyester elastomer composition of the present invention was obtained in the same manner as in Example 1 except for following the amounts of compounding in Table 1. Instead of a stabilizer having a tertiary amine skeleton, poly [{6- (1,1,3,3-tetramethylbutyl) imino-1,3,5] is used as a stabilizer having a primary and secondary amine skeleton. -Triazine-2,4-diyl {(2,2,6,6-tetramethyl-4-piperidylimino)} hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino} (Kimasorb 944FL manufactured by Ciba-Geigy) was used.

(Comparative Example 2) A chip of the polyester elastomer composition of the present invention was obtained in the same manner as in Example 1 except that the amounts were as shown in Table 1. Polyethylene glycol diglycidyl ether was used instead of bisphenol F-diglycidyl ether.

Comparative Example 3 A chip of the polyester elastomer composition of the present invention was obtained in the same manner as in Example 1 except that the amount was as shown in Table 1. No stabilizer with a tertiary amine skeleton was added.

The polyester elastomer compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were evaluated for the following items.

[Tensile rupture strength / elongation] Using an injection molding machine (Yamashiro Seiki model-SAV), insert chips 100 mm x 100 mm x 2 mm
Then, a dumbbell-shaped No. 3 test piece was punched out of the flat plate. Using Tensilon UTM-III manufactured by Toyo Seiki Co., Ltd., the obtained test piece was stretched at a speed of 500 mm per minute, and the load (kg) when the test piece broke was the initial sectional area (cm ² ).
Was taken as the tensile strength at break (kg / cm ² ), and the ratio of the elongation of the sample until the test piece broke to the original sample length was taken as the tensile elongation at break (%).

[Melt Viscosity] The melt flow rate (MFR) at 230 ° C. was measured according to the test method described in JIS K6760.

[Reduced Specific Viscosity] 0.05 g of the polymer was dissolved in 25 ml of a mixed solvent (phenol / tetrachloroethane = 60/40) and measured at 30 ° C. using an Ostwald viscometer.

[Acid value] The acid value was determined by adding 0.5 g of polymer to 100 parts of benzyl alcohol / chloroform (50/50 by weight)
The solution was dissolved in ethanol and titrated with an ethanol solution of KOH.
Phenol red was used as the indicator.

[Heat resistance] The dumbbell test piece was treated with a hot air dryer at 180 ° C., and the tensile elongation retention was lower than the initial tensile elongation.
The time to 50% was measured and used as an index of heat resistance.

[Hydrolysis Resistance] A dumbbell test piece was immersed in boiling water, and the time required for the tensile elongation retention to reach 50% of the initial tensile elongation was measured and used as an index of hydrolysis resistance.

[Measurement of Gelation Ratio] A 50 g polyester elastomer was precisely weighed (V0) in a glass bottle (approximately 4 cmφ × height 20 cm) of about 250 ml, immersed in a silicon oil bath at 250 ° C., and nitrogen was poured from above. While blowing (about 30 ml / min), the mixture was stirred and heated for 4 hours. After the treatment, the contents are dissolved in a mixed solvent (500 ml) of tetrachloroethane and phenol (1/1 weight ratio) (the glass bottle is also washed away with a part of the mixed solvent). The insoluble material was collected by a wire mesh (weight V '), dried at 150 ° C and 10 torr or less for 8 hours, and then precisely weighed together with the wire mesh (V1).
Then, the gelation fraction was determined by the following equation. A sample having a lower gelation fraction is less likely to cause gelation, and is a good sample. Gelation fraction (%) = (V1−V ′) × 100 / V0

[Volatilizing property] About 5 g of a pellet having a water content of not more than 0.03% was collected into a glass weighing bottle (S'g) having a diameter of 6 cm and a height of 3 cm and having a known weight, and was weighed together with the weighing bottle (S0). ), And left in a hot air dryer at 150 ° C for 2 hours with the lid of the bottle opened. After cooling, weigh the weight together with the weighing bottle (S1)
Then, the heating loss rate was calculated by the following equation. A sample having a lower heating loss rate has a better volatility. Loss on heating (%) = (S0-S1) x 100 / (SO-S ') If the moisture content of the pellets exceeds 0.03%, 10
Until the water content becomes 0.03% or less at 0 ° C and 10 torr or less,
Dried

[Chain extender weight loss by heating] A chain extender that has been stored and dried in a desiccator containing silica gel at 25 ° C. for at least one week is a glass weighing bottle (W'g) having a diameter of 6 cm and a height of 3 cm. ) Was collected and weighed (W0 ′) together with the weighing bottle, and then left in a hot air dryer at 200 ° C. for 30 minutes with the lid of the bottle opened. After cooling, the weight is precisely weighed together with the weighing bottle (W1 ')
Then, the heating loss rate was calculated by the following equation. Sample weight before heating (W0'-W ') Sample weight after heating (W1'-W') Chain extender heating weight loss rate = (W0'-W1 ') / (WO'-W')

Table 1 shows the results of evaluating the polyester elastomer compositions obtained in the examples and comparative examples for the above evaluation items.

[0051]

[Table 1]

Stabilizer A: 1- [2- {3- (3,5-di-T-butyl-4-hydroxyphenyl) propionyloxy} ethyl] -4- {3- (3,5-di- T-butyl-4-hydroxyphenyl) propionyloxy {-2,2,6,6-tetramethylpiperidine Stabilizer B: poly [{6- (1,1,3,3-tetramethylbutyl) imino-1 , 3,5-Triazine-2,4
-Diyl {(2,2,6,6-tetramethyl-4-piperidylimino)} hexamethylene} (2,2,6,6
-Tetramethyl-4-piperidyl) imino}]

As is clear from Table 1, the polyester block copolymer is a bifunctional or more compound represented by the above formula (I) and its functional group reacts with the terminal group of the polyester block copolymer. A thermoplastic polyester elastomer comprising a compound capable of being heated and a stabilizer having a tertiary amine skeleton has a low volatility at the time of heating and a composition having a small amount of gelled product can be obtained. Further, the composition of the present invention has very excellent heat resistance and water resistance.

[0054]

EFFECT OF THE INVENTION By using the polyester elastomer composition of the present invention, an elastomer molded article having excellent mechanical strength, heat resistance and hydrolysis resistance, less volatile property upon heating, and less gelled product can be obtained. .

Claims (3)

[Claims] 1. A polyester type block copolymer (a)
Compound (b) which is a bifunctional or more functional compound which satisfies the following formula (I) as a chain extender heating loss rate with respect to 100 parts by weight and whose functional group can react with the terminal group of the above (a): .
A thermoplastic polyester elastomer composition comprising 1 to 10 parts by weight and 0.1 to 5 parts by weight of a stabilizer (c) having a tertiary amine as a part of its skeleton. (W1−W2) /W1≦0.1 (I) where, W1: sample weight before heat treatment W2: sample weight after heat treatment at 200 ° C. for 30 minutes 2. The compound (b) having two or more functional groups satisfying the formula (I) is selected from bisphenol F-diglycidyl ether, bisphenol A-diglycidyl ether, and bisphenol S-diglycidyl ether.
The flame-retardant polyester elastomer composition according to claim 1, wherein at least one kind is used. 3. A thermoplastic polyester elastomer composition wherein the tertiary amine which is a part of the stabilizer (c) is a hindered amine.