JP2000239354A - Polyester-based elastomer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of imparting high viscosity to a polyester-based elastomer by including a specific epoxy resin in a polyester- based block copolymer. SOLUTION: This composition is obtained by blending (A) 100 pts.wt. of a polyester-based block copolymer containing 30-90 wt.% of a block of polyalkylene ether glycol (preferably polytetramethylene ether glycol) with (B) 0.1-5 pts.wt. of epoxy resin of formula I [R is a residue of an organic compound having z-pieces of active hydrogen; (n1)-(nz) are each 0-30; (z) is the number of active hydrogens and 1-10; A is an oxycyclohexane skeleton and expressed by formula II (X is a group of formula III]. Preferably, the composition contains 0.1-5 pts.wt. of a metal salt of a 10-30C aliphatic carboxylic acid per 100 pts.wt. of the component A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester elastomer, and more particularly, to a polyester elastomer composition based on a block copolymer having a block of polyalkylene ether glycol, and a high-viscosity modified polyester using the same. The present invention relates to a method for manufacturing an elastic body.

[0002]

2. Description of the Related Art A block copolymerized poly (ether ester) polymer (hereinafter, referred to as "terephthalic acid") or a dicarboxylic acid such as terephthalic acid or an ester-forming derivative thereof, a low molecular weight glycol or an ester-forming derivative thereof and a polyalkylene ether glycol. Polyester elastomers based on "polyester block copolymer") are widely used in various applications including electric products and automobiles, taking advantage of their good moldability, heat resistance, oil resistance and low-temperature properties. ing. Molded products used in these applications are manufactured by various molding methods such as injection molding, extrusion molding, and blow molding applied to the molding of thermoplastic resins. The blow molding method has been awarded for the bellows-shaped molded product.

In order to stably perform blow molding, it is generally desirable that the viscosity of the resin is high, that is, the degree of polymerization is high. However, in the production of a polyester-based block copolymer, if the degree of polymerization becomes too high, Therefore, high viscosity products are usually produced by performing solid phase polymerization after melt polymerization. However, a copolymer containing a large amount of polyalkylene ether glycol has a low melting point, and a high-viscosity product could not be obtained by a solid phase polymerization method. As another method for producing a high viscosity product, a compound or a polymer having a functional group capable of reacting with a terminal group (usually a carboxyl group) of a polyester block copolymer is added and melted using an extruder or the like. A method of kneading has also been proposed. However, in the case of a copolymer containing a large amount of polyalkylene ether glycol, it was not possible to sufficiently achieve the object by a conventional melt kneading method.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a composition capable of imparting a high viscosity to a polyester-based elastomer, based on a polyester-based block copolymer containing a large amount of polyalkylene ether glycol. It is an object of the present invention to provide a method for producing a high-viscosity modified polyester elastomer based on the above.

[0005]

Means for Solving the Problems The present inventor has made various studies in order to solve the above problems, and as a result, has found that a composition containing a specific epoxy resin can solve the above problems. Heading, the present invention has been completed. That is, the gist of the present invention is that the polyalkylene ether glycol is 30 to
A polyester-based block copolymer containing 90% by weight and the following general formula (1) per 100 parts by weight of the copolymer:
The polyester elastomer composition contains 0.1 to 5 parts by weight of the epoxy resin represented by the formula (1).

[0006]

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However, R is a residue of an organic compound having z active hydrogens, wherein the organic compound contains at least one hydroxyl group as an active hydrogen group, or at least one hydroxyl group as an active hydrogen group. One or a mixture of two or more unsaturated alcohols simultaneously containing an unsaturated double bond-containing group, wherein n ₁ , n _{2 ,.} Each is 0 or an integer of 1 to 30 and the sum is 1 to 100;
Is an integer of 1 to 10 representing the number of active hydrogen groups of the formula (1), A is an oxycyclohexane skeleton having a substituent X, and is a group represented by the following formula (2).

[0008]

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The gist of the present invention is that R is a trimethylolpropane residue (z = 3), n ₁ , n ₂ and n ₃ are each an integer of 5 to 30 and the sum is 15 to 90. And the above-mentioned polyester-based elastomer composition comprising 0.1 to 5 parts by weight of a metal salt of an aliphatic carboxylic acid having 10 to 30 carbon atoms per 100 parts by weight of the copolymer. The gist of the present invention also resides in the above-mentioned polyester-based elastomer composition wherein the polyalkylene ether glycol is polytetramethylene ether glycol. Further, another gist of the present invention is to provide a method for producing a modified polyester elastic material characterized by melt-kneading the above-described composition, and the melt-kneading is performed by using a single-screw or twin-screw extruder at a temperature of 180 ° C.
To 260 ° C. and a residence time of 15 seconds to 10 minutes.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester-based block copolymer used in the present invention is obtained from dicarboxylic acids such as terephthalic acid or its ester-forming derivatives, low molecular weight glycols or its ester-forming derivatives, and polyalkylene ether glycols. A block copolymer poly (ether ester) polymer is suitable, and this block copolymer usually has a carboxyl group at a terminal.
As the polyalkylene ether glycol, for example,
Polyethylene glycol, polypropylene glycol,
Examples include polytrimethylene ether glycol, polytetramethylene ether glycol, polyhexamethylene ether glycol, a block or random copolymer of ethylene oxide and propylene oxide, and a block or random copolymer of ethylene oxide and tetrahydrofuran. Methylene ether glycol is preferred.

The polyalkylene ether glycol has a weight average molecular weight of 400 to 6,000, especially 6
The content of the block of the polyalkylene ether glycol in the copolymer is preferably from 30 to 90% by weight, more preferably from 40 to 85% by weight,
Particularly preferably, it is 50 to 80% by weight. When the content is less than 30% by weight, the viscosity can be increased by a conventional method, but the obtained modified polyester elastic body loses flexibility, and on the other hand, when the content is higher than 90% by weight. In this case, the blocking property is impaired, so that the material strength is not reduced and rubber-like properties are not exhibited.

In the present invention, the dicarboxylic acid or its ester-forming derivative includes phthalic acid, terephthalic acid, isophthalic acid, 1,4- or 2,6-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, ,
Aromatic dicarboxylic acids such as 4′-diphenyl ether dicarboxylic acid and 4,4′-diphenylsulfone dicarboxylic acid, and alkyl esters thereof can be exemplified, and low molecular weight glycols or ester-forming derivatives thereof include:
Aliphatic diols such as ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol and hexamethylene glycol; alicyclic diols such as 1,4-cyclohexanediol and 1,4-cyclohexanedimethanol; and 4,4′-dihydroxy Aromatic diols such as biphenyl and 2,2-bis (4′-β-hydroxyethoxyphenyl) propane can be exemplified. Each of these components may contain one kind or two or more kinds.

The polyester block copolymer used in the present invention has a flexural modulus specified by JIS K 7203 of 600 MPa or less, more preferably 300 M or less.
Pa or less, particularly preferably 10 to 200 MPa, and a melting peak temperature by a differential scanning calorimeter of 100 to 230 ° C, more preferably 110 to 210 ° C.
° C, particularly preferably 120 to 190 ° C.
The density of this copolymer is 1.00 to 1.20 g / cm ³ ,
It is more preferably from 1.01 to 1.15 g / cm ³ , particularly preferably from 1.03 to 1.10 g / cm ³ . Examples of such a block copolymer include “Primalloy” (trade name, manufactured by Mitsubishi Chemical Corporation), “Perprene P” (trade name, manufactured by Toyobo Co., Ltd.) and “Hytrel” (trade name of Toray Industries, Inc.)
It can be appropriately selected from commercially available products such as DuPont (trade name) and “Flekmer” (trade name of Nippon Synthetic Chemical Industry Co., Ltd.). In the present invention, the specific epoxy resin represented by the following formula (1) capable of reacting with the terminal group of the above-mentioned polyester-based block copolymer to effectively bind the polymer chain is used. 0.1 to 5 parts by weight per 100 parts by weight of the combined.

[0014]

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Here, R is a residue of an organic compound having z active hydrogens, wherein the organic compound contains at least one hydroxyl group as an active hydrogen group, or at least one hydroxyl group as an active hydrogen group. One or a mixture of two or more unsaturated alcohols simultaneously containing an unsaturated double bond-containing group, wherein n ₁ , n _{2 ,.} Each is 0 or an integer of 1 to 30 and the sum is 1 to 100;
Is an integer of 1 to 10 representing the number of active hydrogen groups of the formula (1), A is an oxycyclohexane skeleton having a substituent X, and is a group represented by the following formula (2).

[0016]

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If the amount of the epoxy resin is less than 0.1 part by weight, the viscosity of the modified polyester elastomer obtained by melt-kneading the composition does not become sufficiently high, while the amount of the epoxy resin exceeds 5 parts by weight. In the case of mixing, polymer chains are excessively bonded, and the moldability is significantly deteriorated. Further, R constituting the main skeleton of the epoxy resin must satisfy the condition of the above formula (1), and specific examples thereof include ethylene glycol, diethylene glycol, triethylene glycol, trimethylolpropane, trimethylolmelamine, and isocyanuryl. Each residue of an acid is mentioned. Of these, the trimethylolpropane residue is advantageous in terms of availability and ease of handling as a resin. The maximum value _z of the subscripts of n ₁ , n ₂ ,... _nz represents the number of active hydrogen groups of R. For example, ethylene has a value of 2 and trimethylolpropane has a value of 3. z
If the value is 0, the effect of increasing the viscosity cannot be obtained because the epoxy group cannot be contained. On the other hand, if the value of z is 11 or more, it is difficult to obtain a skeleton compound, and the price is high, which is not economical. .

The number (chain length) n ₁ , n of the epoxy group-containing cyclohexyl ether group represented by A is bonded.
₂ ,... _Nz are each 0 or an integer of 1 to 30, and the sum thereof is 1 to 100. These n ₁ , n ₂ , ...
-If _nz is more than 30 and too large, the viscosity of the epoxy resin becomes high and the handleability deteriorates. Also, n ₁ , n ₂ ,
... If the sum of _nz is 0, there is no reactivity, and if it exceeds 100, it is difficult to control the degree of viscosity increase during melt-kneading. When R is a trimethylolpropane residue,
n ₁ , n ₂ and n ₃ are each an integer of 5 to 30, and the sum thereof is preferably 15 to 90.

The composition of the present invention contains 10 to 30 carbon atoms.
0.1 to 5 parts by weight per 100 parts by weight of a polyester block copolymer containing 30 to 90% by weight of the block of polyalkylene ether glycol described above, This is preferable because the reaction between the union and the epoxy resin having the specific structure is promoted. If the amount is less than 0.1 part by weight, the promoting effect tends to be insufficient. On the other hand, if the amount exceeds 5 parts by weight, bleeding is liable to occur, and the polymerization degree may be inhibited. Not very good. The carboxylic acid component of the aliphatic carboxylic acid metal salt is preferably a monocarboxylic acid or a dicarboxylic acid, and particularly preferably a monocarboxylic acid. In addition, as the metal component,
Alkali metals or alkaline earth metals are preferred, with alkali metals being particularly preferred.

The composition of the present invention contains a styrene elastomer or an olefin elastomer in an amount of 1 to 100 parts by weight per 100 parts by weight of a polyester block copolymer containing 30 to 90% by weight of the above polyalkylene ether glycol block. The addition is preferred because the flexibility of the composition of the present invention is increased. When the amount is less than 1 part by weight, the flexibility is hardly changed, while when the amount exceeds 100 parts by weight, the reaction between the block copolymer and the epoxy resin having the specific structure becomes difficult. Not so desirable. As the styrene-based elastomer that can be used here, a styrene-based elastomer in which the hard segment is a polymer block of a styrene-based compound and the soft segment is a polymer block of a conjugated diene compound.
Commonly used ones such as a conjugated diene block copolymer can be used, and the styrene-based compound as a component thereof includes styrene, α-methylstyrene, p-methylstyrene, dimethylstyrene, vinylnaphthalene, and the like. Styrene is preferred. Examples of the conjugated diene compound include butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene, and the like. Among them, butadiene, isoprene, or a combination of both is preferable.

As the styrene elastomer in the present invention, a hydrogenated product of the styrene-conjugated diene block copolymer can be used. The styrene content in such a styrenic elastomer is 5 to 50% by weight, preferably 8 to 45% by weight, and particularly preferably 10 to 50% by weight.
It is preferably 40% by weight. Examples of the styrene-based elastomer include “Clayton G” (trade name, manufactured by Shell Japan), “Septon”, “Hibler” (trade names, all manufactured by Kuraray Co., Ltd.) and “Toughtec” (trade name, manufactured by Asahi Kasei Corporation) , A commercially available styrene copolymer rubber such as "Dynalon" (trade name, manufactured by Nippon Synthetic Rubber Co., Ltd.), and an olefin resin, a softener for hydrocarbon rubber, an inorganic filler, etc. “Clayton G Compound” (trade name, manufactured by Shell Japan), “Tuftec Compound (E Series / H Series)” (trade name, manufactured by Asahi Kasei Kogyo), “Lavalon” (Mitsubishi Chemical Corporation), which are commercially available as compounded compounds Product name),
"Elastomer AR" (trade name of Aron Kasei Co., Ltd.) can be used.

As the olefin-based elastomer, for example, a copolymer, a composition or a mixture in which the hard segment is composed of a propylene-based resin and the soft segment is composed of an ethylene-based rubber, or a partially crosslinked product thereof can be used. . As the propylene resin used here,
For example, a homopolymer of propylene, mainly composed of propylene, and two to two carbon atoms such as ethylene, butene-1, pentene-1, hexene-1, heptene-1, and octene-1.
Copolymers with about 10 other α-olefins may be mentioned. As the ethylene rubber, for example, ethylene and
Ethylene as a main component, propylene, butene-
1, pentene-1, hexene-1, heptene-1, octene-1 and other copolymers having about 3 to 10 carbon atoms with other α-olefins, and further copolymerized with 5-ethylidene-2-
Norbornene, 5-methylene-2-norbornene, 5-
Copolymers obtained by copolymerizing non-conjugated dienes such as vinyl-2-norbornene and dicyclopentadiene are exemplified.
As in the case of the styrene elastomer, as the olefin elastomer, a compound obtained by blending a softener for a hydrocarbon rubber, an inorganic filler, or the like with the copolymer or the composition / mixture or a partially crosslinked product thereof is used. It is also possible to use, for example, "Thermolan" (trade name, manufactured by Mitsubishi Chemical Corporation), "Milastomer" (trade name, manufactured by Mitsui Chemicals),
A commercially available product such as “Sumitomo TPE” (trade name, manufactured by Sumitomo Chemical Co., Ltd.) or “Santoprene” (trade name, manufactured by AES) may be appropriately selected and used.

The polyester-based elastomer composition of the present invention may contain any of the above-mentioned components and, if necessary, any other components other than those described above, such as polyester-based elastomers and polyamides, as long as the effects of the present invention are not impaired. Elastomers, urethane elastomers, styrene elastomers, and elastomers such as olefin elastomers, natural rubber, polyisoprene rubber, polybutadiene rubber, styrene-butadiene rubber or its hydrogenated product, acrylonitrile-butadiene rubber, chloroprene rubber,
Rubbers such as butyl rubber, ethylene-propylene rubber, ethylene-butene-1 rubber, ethylene-octene-1 rubber, ethylene-propylene-nonconjugated diene rubber, silicone rubber, fluorine rubber, urethane rubber, ethylene-vinyl acetate copolymer, chlorine Polyethylene resin, soft resins such as soft vinyl chloride, olefin resins such as ethylene resin and propylene resin, calcium carbonate, titanium oxide, filler such as talc, mica, whisker, glass fiber, carbon fiber, etc., and oxidation Inhibitors, heat stabilizers, light stabilizers, ultraviolet absorbers, neutralizers, lubricants, lubricants, antifoggants, antiblocking agents, antistatic agents, antibacterial agents, fluorescent brighteners, dispersants, colorants, etc. Can be prepared by blending and mixing the above additives.

By melt-kneading the composition thus obtained, it is possible to obtain a high-viscosity modified polyester elastomer having a high content of polyalkylene ether glycol. This melt-kneading is generally performed using an extruder, and the extruder is preferably a single-screw or twin-screw extruder, and particularly preferably a twin-screw extruder. 180 ° C ~ 260 ° C, residence time 15 seconds ~
The time of 10 minutes is preferable for obtaining a high-viscosity modified polyester-based elastic body. The temperature during melt kneading is 180 ° C
If it is less than 10, the polyester-based block copolymer is difficult to melt, and the reaction with the epoxy resin is slow, so that it becomes difficult to obtain a high-viscosity modified polyester elastic body. If it exceeds, thermal degradation of the polymer starts, and the strength tends to decrease and the hue tends to deteriorate. If the residence time in the extruder during the melt kneading is less than 15 seconds, the progress of the reaction tends to be insufficient, making it difficult to obtain a high-viscosity modified polyester elastic body.
If it is longer than minutes, thermal degradation of the polyalkylene ether glycol block is likely to occur, and again,
It tends to be difficult to obtain the desired high viscosity modified polyester elastomer.

More preferred conditions for melt-kneading by an extruder are a temperature of 190 to 250 ° C. and a residence time of 20 seconds to 5 minutes. More preferred conditions for melt-kneading by an extruder are a temperature of 200 to 240 ° C. and a residence time of 30 seconds to 3 minutes. The polyester-based elastomer composition of the present invention can be produced by various molding methods usually used for thermoplastic resins and thermoplastic elastomers, such as injection molding, extrusion molding, blow molding, hollow molding, compression molding, rotational molding, thermoforming and the like. The desired molding can be formed by the molding method, but the molding processability in extrusion molding, blow molding and blow molding is particularly good.

[0026]

EXAMPLES Hereinafter, specific embodiments of the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof. <Components> Polyester block copolymer (symbol with “A” attached)
In shown) A-1; polybutylene terephthalate as a hard segment and a polyester polyether block copolymer of polytetramethylene ether glycol having a weight average molecular weight of 2,000 as a soft segment, the content of the polytetramethylene ether glycol Is 70% by weight
Polyester thermoplastic elastomer (flexural modulus 3
0 MPa, density 1.07 g / cm ³ , melting peak temperature 166 ° C. by differential scanning calorimetry, JIS-A hardness 83).

A-2: A polyester polyether block copolymer comprising polybutylene terephthalate as a hard segment and polytetramethylene ether glycol having a weight average molecular weight of 1,000 as a soft segment, and the content of the polytetramethylene ether glycol Is a polyester-based thermoplastic elastomer having a flexural modulus of 35 MPa, a density of 1.11 g / cm ³ , a melting peak temperature of 153 ° C. by a differential scanning calorimeter, JIS-
A hardness 92).

A-3: A polyester polyether block copolymer containing polybutylene terephthalate as a hard segment and polytetramethylene ether glycol having a weight average molecular weight of 1,000 as a soft segment, and the content of the polytetramethylene ether glycol Is 50% by weight of a polyester thermoplastic elastomer (flexural modulus 92 MPa, density 1.14 g / cm ³ , melting peak temperature by differential scanning calorimetry 185 ° C., JIS-
A hardness 97).

A-4: A polyester polyether block copolymer comprising polybutylene terephthalate as a hard segment and polytetramethylene ether glycol having a weight average molecular weight of 1,000 as a soft segment, and the content of the polytetramethylene ether glycol Is 20% by weight of a polyester thermoplastic elastomer (flexural modulus 410 MPa, density 1.24 g / cm ³ ,
Melting peak temperature 217 ° C by differential scanning calorimeter, JIS
-A hardness 99). Epoxy resin (indicated by the symbol with "B")

B-1: R in the above general formula (1) is a trimethylolpropane residue (z = 3), and n ₁ , n ₂ , n ₃
Are each 5 (epoxy equivalent 170
-200, softening point 85 ± 10 ° C; “EHPE3150” manufactured by Daicel Chemical Industries, Ltd.). B-2: an alicyclic liquid epoxy resin represented by the following formula (epoxy equivalent: 133 to 143: "Epicoat 171" manufactured by Yuka Shell Epoxy).

[0031]

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B-3: Neopentyl glycol diglycidyl ether (epoxy equivalent: 140; "Denacol EX-211" manufactured by Nagase Kasei Kogyo Co., Ltd.). Metal salt of aliphatic carboxylic acid (indicated by the symbol with “C” attached)
Be) C-1; lithium stearate (C ₁₇ H ₃₅ COOLi)
(Indicated by the symbol marked with "D") (Nippon Trading Co., Ltd.) styrene elastomer D-1; styrene - butadiene - styrene block copolymer hydrogenated block copolymer (styrene content 32
Weight%, weight average molecular weight 246,000, 1,2-vinyl bond content of butadiene block 37 weight%, hydrogenation rate 98% or more; "Clayton G1" manufactured by Shell Japan Co., Ltd.
651 ") per 100 parts by weight of paraffinic oil (kinematic viscosity at 40 ° C 381.6 cSt, weight average molecular weight 74)
6; "Diana Process Oil PW38" manufactured by Idemitsu Kosan Co., Ltd.
0 ") and 20 parts by weight of a polypropylene resin (flexural modulus 1400 MPa, density 0.90 to 0.91;" Novatech PP MA2P "manufactured by Nippon Polychem Co., Ltd.) and mixed with a Henschel mixer. Next, the mixture was melt-kneaded using a twin screw extruder having a compression ratio of L / D = 30 and a cylinder diameter of 44 mm at a set temperature of 220 ° C. to obtain a styrene-based elastomer.

<Examples 1 to 9 and Comparative Examples 1 to 8>
Each component was blended at the composition ratio shown in FIG. 2, and the total amount of this blend was set to 100 parts by weight, and the phenol-based antioxidant (“Irganox 1010” manufactured by Ciba-Gaiky) and the thioether-based antioxidant (Shiroishi) Calcium “Seanox 412S”) was added in an amount of 0.2 parts by weight.
The mixture was uniformly mixed at room temperature for 2 minutes. The obtained mixture was melt-kneaded at 220 ° C. using a twin-screw extruder having a cylinder diameter of 44 mm and a compression ratio of L / D30 to produce thermoplastic elastomer composition pellets. 100 ° C.
After drying for 3 hours using an in-line screw type injection molding machine (“IS90B” manufactured by Toshiba Machine Co., Ltd.), injection molding was performed at an injection pressure of 500 kg / cm ² , an injection temperature of 220 ° C., and a mold temperature of 30 ° C. 120mm long x 80m wide
An mx 2 mm thick sheet was prepared.

<Evaluation Method> The pellets and the injection molded sheets were evaluated according to the following methods. Table 1 shows the results.
2 collectively. Melt flow rate (MFR) The obtained pellets are dried at 100 ° C for 30 minutes, and then subjected to MFR (230) according to JIS-K-7210.
° C, 2.16 kg load). A test piece was prepared from the sheet having the obtained tensile strength and tensile elongation, and was subjected to JIS-K-63.
The tensile strength and the tensile elongation were measured according to No. 01. The JIS-A hardness in compliance with flexibility JIS-K-6301, J
The JIS-D hardness was measured according to IS-K-7215. <Evaluation of Results> When no specific epoxy resin essential for the present invention is contained (Comparative Examples 1 to 3), or when the properties of the epoxy resin are out of the range of the present invention (Comparative Examples 6 to 8)
Is, as evident from its melt flow rate value,
The expected increase in molecular weight has not occurred. On the other hand, even if an epoxy resin having the properties satisfying the requirements of the present invention is used, if the amount of use is too large (Comparative Example 4), excessive crosslinking occurs and pelletization and molding are difficult. Also,
Even in Comparative Example 5 in which the content of the polyalkylene ether glycol block was out of the range of the present invention, pelletization and molding became difficult probably due to excessive crosslinking.

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

According to the present invention, a polyester elastomer composition comprising an epoxy resin and a polyester block copolymer containing 30 to 90% by weight of a block of polyalkylene ether glycol, and a high viscosity modified polyester excellent in flexibility An elastic body can be manufactured.

Claims (6)

[Claims] 1. A polyester block copolymer containing 30 to 90% by weight of a block of polyalkylene ether glycol, and an epoxy resin represented by the following general formula (1) per 100 parts by weight of the copolymer: A polyester elastomer composition containing 1 to 5 parts by weight. Embedded image Here, R is a residue of an organic compound having z active hydrogens, wherein the organic compound contains at least one hydroxyl group as an active hydrogen group, or contains at least one hydroxyl group as an active hydrogen group. And one or a mixture of two or more unsaturated alcohols simultaneously containing an unsaturated double bond-containing group,
n ₁ , n ₂ ,... _nz are each 0 or an integer of 1 to 30 and the sum is 1 to 100; z is an integer of 1 to 10 representing the number of active hydrogen groups of R; Is an oxycyclohexane skeleton having a substituent X, and is a group represented by the following formula (2). Embedded image 2. R is a trimethylolpropane residue (z =
In _{3), n 1, n 2} , n 3 is an integer of 5-30, polyester elastomer composition according to claim 1 and the sum is 15 to 90. 3. A metal salt of an aliphatic carboxylic acid having 10 to 30 carbon atoms is added in an amount of 0.1 to 100 parts by weight of the copolymer.
The polyester-based elastomer composition according to claim 1, wherein the content is from 5 to 5 parts by weight. 4. The method according to claim 1, wherein the polyalkylene ether glycol is polytetramethylene ether glycol.
4. The polyester elastomer composition according to any one of the above items 3. 5. A method for producing a modified polyester elastic body, comprising melt-kneading the composition according to any one of claims 1 to 4. 6. The method for producing a modified polyester elastic body according to claim 5, wherein the melt-kneading is performed using a single-screw or twin-screw extruder at a temperature of 180 to 260 ° C. and a residence time of 15 seconds to 10 minutes. .