JPH0995578A - Thermoplastic elastomer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermoplastic elastomer compsn. excellent in rubber elasticity, impact resilience, low-temp. characteristics, and heat resistance by mixing a crystalline chlorinated polyethylene and a thermoplastic polyester elastomer. SOLUTION: This compsn. is obtd. by mixing 99-1wt.% thermoplastic polyester elastomer comprising 10-97wt.% high-m.p. polyester segments (hard segments) having an m.p. of 150 deg.C or higher and 90-3wt.% low-m.p. polymer segments (soft segments) having an m.p. or softening point of 80 deg.C or lower and a number average mol.wt. of 400-6,000 with 1-99wt.% crystalline chlorinated chlorinated polyethylene having a degree of chlorination of 20-45wt.%, a heat of crystal fusion of 5-35cal/g by DSC, and an absorption if di-2-ethylhexyl phthalate of 25 or higher and obtd. by chlorinating polyethylene having an average mol.wt. of 100,000-750,000 or a melt flow rate of 0.1-10.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel thermoplastic elastomer composition having excellent rubber elasticity, impact resilience, low temperature characteristics and heat resistance.

[0002]

2. Description of the Related Art Thermoplastic polyester elastomers are:
Although it has good moldability, heat aging resistance, and chemical resistance, and is widely used in a wide range of fields, there is a limit to lowering the modulus of elasticity (that is, lowering hardness) by copolymerization, and the price is low. There is a problem that the cost is high and the use is limited. On the other hand, a thermoplastic elastomer composition using crystalline chlorinated polyethylene, which has excellent rubber elasticity (particularly compression set), excellent low temperature characteristics, weather resistance, and moldability, is disclosed in JP-A-4-335047.
Japanese Patent Laid-Open No. 5-1187 and Japanese Patent Laid-Open No. 5-1187. Molded articles produced from these compositions have the disadvantage of deforming beyond the melting temperature caused by polyethylene crystals, and have been difficult to use at high temperatures. Therefore, the use is limited. Further, a thermoplastic resin composition comprising a thermoplastic polyester elastomer and chlorinated polyethylene, for example, JP-B-53-13227, JP-B-55-11140, JP-A-3-140331, JP-A-3-40331 It is publicly known in Japanese Patent No. 21662. However, in the compositions disclosed in these publications, there is no technical idea that crystalline chlorinated polyethylene is used to impart rubber elasticity to the composition, in other words, to improve compression set. .

[0003]

DISCLOSURE OF THE INVENTION According to the present invention, by mixing a crystalline chlorinated polyethylene and a thermoplastic polyester elastomer, a novel heat-generating material having both properties without losing their respective characteristics is obtained. The inventors have found that a plastic elastomer composition can be obtained, and have completed the present invention. That is, an object of the present invention is to provide a novel thermoplastic elastomer composition having excellent properties such as rubber elasticity, impact resilience, low temperature characteristics and heat resistance.

[0004]

DISCLOSURE OF THE INVENTION The gist of the present invention is that a thermoplastic polyester elastomer obtained by copolymerizing a high melting point polyester segment and a low melting point polymer segment is 99 to 1% by weight and a chlorination degree is 20 to 45% by weight. , DS
A thermoplastic elastomer composition comprising 1 to 99% by weight of a chlorinated polyethylene having a heat of fusion of C-method crystals of 5 to 35 cal / g.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail. The thermoplastic polyester elastomer (hereinafter simply referred to as polyester elastomer) used in the thermoplastic elastomer composition of the present invention has a high melting point polyester segment (hereinafter referred to as hard segment) and a low melting point polymer segment (hereinafter referred to as soft segment). And a block copolymer having a crystal melting point of 80 ° C. or higher.

The hard segment preferably has a melting point of 150 ° C. or higher when a high polymer is formed only by its constituent components. The polyester constituting such a hard segment is, for example, terephthalic acid, isophthalic acid,
1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, bisbenzoic acid, bis (p-carboxyphenyl) methane,
Aromatic dicarboxylic acid residues such as 4,4-sulfonyldibenzoic acid and ethylene glycol, propylene glycol, tetramethylene glycol, pentamethylene glycol,
Polyester consisting of diol residues such as 2,2-dimethyltrimethylene glycol, hexamethylene glycol, decamethylene glycol, p-xylene glycol, cyclohexanedimethanol, and the like, and two or more of these dicarboxylic acids and diols were reacted. Copolyester, p- (β-hydroxyethoxy) benzoic acid,
Oxyacids such as p-oxybenzoic acid and the like, polyesters derived from their residues, polylactones such as polypivalolactone, aromatic ethers such as 1,4-bis (4,4'-dicarboxydiphenoxy) ethane Polyether polyester consisting of a dicarboxylic acid residue and the aforementioned diol residue, further described above dicarboxylic acid, oxyacid,
Copolymerized polyesters containing diols and the like at an arbitrary composition ratio are exemplified. In the present invention, a polyester composed of an aromatic dicarboxylic acid and an aliphatic diol is desirable, and polybutylene terephthalate is particularly desirable.

One of the components constituting the polyester elastomer, the soft segment, shows a substantially amorphous state in the polyester elastomer at room temperature,
It has a melting point or softening point of 80 ° C. or lower when measured only with the segment components, and the number average molecular weight is suitably in the range of 400 to 6000.

Typical soft segment constituents include, for example, polyoxyalkylene glycols such as polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, and mixtures thereof; and two or more kinds of alkylene oxides. Copolymerized polyoxyalkylene glycols obtained by copolymerizing; an aliphatic or alicyclic glycol having 2 to 10 carbon atoms and an aliphatic or alicyclic dicarboxylic acid having 2 to 12 carbon atoms, for example, polyethylene adipate, Polyester glycols such as polytetramethylene adipate, polyethylene sebacate, polyneopentyl sebacate, polytetramethylene dodecanoate, polytetramethylene azelate, polyhexamethylene azelate; poly-ε
An aliphatic polyester glycol having a hydroxyl group at the end by ring-opening polymerization of caprolactone or the like; a polyester glycol comprising the above polyoxyalkylene glycols and a dibasic acid; and an aliphatic or alicyclic dicarboxylic acid and an aliphatic Alternatively, a copolymerized polyester glycol obtained by using two or more kinds of alicyclic glycols or polyoxyalkylene glycols can be exemplified. Among these soft segments, in the present invention, polyoxytetramethylene glycol and poly-ε-caprolactone are preferable, and polyoxytetramethylene glycol is particularly preferably used.

Thus, the ratio of the hard segment and soft segment constituents in the polyester elastomer is in the range of 97 to 10% by weight, of which 80 is the most preferable.
10 to 10% by weight, especially 70 to 20% by weight, the latter being 3%
~ 90% by weight, among which 20-90% by weight,
In particular, it is preferably in the range of 30 to 80% by weight.

Chlorinated polyethylene, which is another component of the thermoplastic elastomer of the present invention, is a crystalline chlorinated polyethylene having a degree of chlorination of 20 to 45% by weight and a DSC heat of fusion of crystal of 5 to 35 cal / g. It is necessary that the amount of heat of fusion of the crystal of the former is within the range of the crystal residue of polyethylene, that is, the so-called crystallinity of 10 to 75%. When the degree of chlorination of chlorinated polyethylene is less than 20% by weight, the compatibility with the plasticizer described later is poor and the rubber elasticity is poor.
If it is more than 10% by weight, low temperature properties are poor and only rubber elasticity is poor. Further, when the heat of crystal fusion is less than 5 cal / g, the effect of improving the compression set is lost.
If it is above cal / g, only hard products can be obtained, and the workability is extremely poor.

The DSC (Differential Scanning Calorimeter) method for crystallizing fusion heat of chlorinated polyethylene is a heating rate of 10 ° C./min. Means the value calculated from the total crystal peak area of the DSC chart measured in 5 cal.
A value of less than / g indicates that there is substantially no residual crystal. The crystal melting point described later is the temperature at which the highest peak among all the crystal peaks at the time of DSC crystal fusion calorimetry is measured.

The chlorinated polyethylene used in the present invention has a weight average molecular weight of 10 before polyethylene.
~ 750,000, or JIS K-7210, Condition 7
And the melt flow rate (MF
It is preferred to use post-chlorinated R) of 0.1 or more and 10 or less, respectively. Condition 7 is 190
° C, under a high load of 21.6 kgf, condition 4 was 190 ° C,
It is a measurement under a low load of 2.16 kgf.

If the molecular weight of polyethylene before chlorination is less than 100,000 or if the MFR of chlorinated polyethylene before chlorination is less than 10 under MFR, the mechanical strength is low and a large amount of plasticizer is added. Difficult to do. on the other hand,
If it exceeds 750,000 or the MFR under a high load is less than 0.1, the workability is deteriorated, which is not preferable. The above-mentioned weight average molecular weight was calculated from the value measured by GPC (gel permeation chromatography).

The chlorinated polyethylene used in the present invention preferably has an oil absorption of 25 or more when di-2-ethylhexyl phthalate (DOP) is used as oil. The oil absorption amount of DOP is the addition volume of DOP expressed as a number of ml in which the chlorinated polyethylene powder becomes a dumpling mass while stirring while adding DOP little by little to 100 g of the chlorinated polyethylene powder under a temperature condition of 23 ° C., D
An OP oil absorption of 25 or more means that it does not become a lump even after adding 25 ml of DOP and is in the form of powder, or that it appears to be hardened and is dispersed by a slight force or impact. The measuring method was performed according to JIS K-5101.

The blending ratio of the polyester elastomer and the chlorinated polyethylene in the thermoplastic elastomer composition of the present invention is 99 to 1% by weight, preferably 90 to 1% by weight.
In the range of 10% by weight, the latter 1 to 99% by weight, preferably 1
It is selected from the range of 0 to 90% by weight. By adding chlorinated polyethylene to the polyester elastomer, the polyester elastomer has good moldability,
In addition to heat aging resistance and chemical resistance, a low elastic modulus (that is, low hardness) can be obtained, and the cost can be reduced. The degree can be changed by the composition ratio.

By adding a polyester elastomer to chlorinated polyethylene, the good rubber elasticity of chlorinated polyethylene, in particular compression set, low temperature characteristics, weather resistance, moldability, and heat resistance, which is a defect, are improved. It is possible to change the degree, and the degree can be changed by the composition ratio. Therefore, it is possible to select an alloy of polyester elastomer and chlorinated polyethylene having good heat resistance and rubber elasticity and a wide elastic modulus (hardness) by arbitrarily changing the composition ratio.

A plasticizer is preferably added to the thermoplastic elastomer composition of the present invention. The plasticizer is not particularly limited as long as it is used for a vinyl chloride resin, and examples thereof include di-2-ethylhexyl phthalate (DOP), di-n-octyl phthalate,
Phthalate ester plasticizers such as diisodecyl phthalate, dibutyl phthalate, dihexyl phthalate; linear dibasic acid ester plasticizers such as dioctyl adipate and dioctyl sebacate; polyester polymer plasticizers; epoxidized soybean oil, epoxidized linseed Epoxy plasticizers such as oil and liquid epoxy resins; phosphoric ester plasticizers such as triphenyl phosphate, trixylyl phosphate, and tricresyl phosphate can be used, and one or more of these can be used in combination.

The amount of the plasticizer used is appropriately selected depending on the kind of resin components constituting the thermoplastic elastomer composition, the compounding ratio, other additives, or the desired hardness, but 100 parts by weight of chlorinated polyethylene. To 200 parts by weight or less, usually 5 to 200
A suitable range is parts by weight, preferably 10 to 160 parts by weight. If the amount of the plasticizer is too large, the bleed phenomenon cannot be suppressed, and the processing becomes difficult.

In the thermoplastic elastomer composition of the present invention,
Not only improving the compression set, which is rubber elasticity, by containing a rubber substance containing a cross-linking component that is not dissolved in a good solvent of uncross-linked rubber (hereinafter referred to as a partially cross-linked rubber substance or a gel-containing rubber substance). The oil resistance can be improved. Basically, the thermoplastic polyester elastomer has good oil resistance, but when chlorinated polyethylene is blended with the thermoplastic polyester elastomer, the oil resistance gradually decreases depending on the blending amount. The idea is to cover this decrease by adding a partially crosslinked rubber substance.

Examples of the partially crosslinked rubber substance include acrylonitrile-butadiene copolymer rubber (NBR) and methylmethacrylate-butadiene-styrene copolymer rubber (M
BS), acrylic rubber (AR) styrene-butadiene copolymer rubber (SBR), isoprene rubber (IR), chloroprene rubber (CR), ethylene-propylene copolymer rubber (EPR), ethylene-propylene-diene copolymer When a rubber (EPDM), ethylene-vinyl acetate copolymer rubber (EVA), urethane rubber (PUR), or other rubber is manufactured, a polyfunctional monomer is added to the polymerization system, or after the rubber is manufactured, it is crosslinked with an organic peroxide. It is produced by partially introducing a crosslinked structure into the rubber molecule by a method such as treatment. Among these, it is preferable to use the one having a crosslinked structure introduced by adding a polyfunctional monomer at the time of producing a rubber substance.

These rubber substances have a solubility of 80% by weight or less, preferably 50% by weight or less in a good solvent of uncrosslinked rubber, that is, a crosslinkable component insoluble in a good solvent, a so-called gel component. Content of more than 20% by weight, preferably more than 50% by weight. When the solubility of the rubber substance exceeds 80% by weight, the effect of improving rubber elasticity, particularly compression set, is small, and the meaning of adding the rubber substance is reduced.

The good solvent for the uncrosslinked rubber is, for example, NBR,
For rubber substances such as MBS, AR, SBR, CR, EVA and PUR, tetrahydrofuran (THF) is used and EPR and E are used.
Toluene is used for rubber substances such as PDM, and chloroform is used for rubber substances such as IR. Therefore, the amount of the rubber substance added is 400 parts by weight or less, preferably 20 to 400 parts by weight, and particularly 50 to 100 parts by weight with respect to 100 parts by weight of chlorinated polyethylene.
A range of 300 parts by weight is suitable. When the amount of rubber substance added is small, for example, when the amount of chlorinated polyethylene is large, it is difficult to exert the effect of oil resistance, and
If the amount added is too large, the strength will decrease and the moldability will also deteriorate.

In addition to the above-mentioned constituents, the thermoplastic elastomer composition of the present invention may optionally contain a heat stabilizer, a lubricant, an antioxidant, an ultraviolet absorber, a foaming agent, a flame retardant, a pigment, an impact modifier. Various compounding agents such as a bulking agent and a filler may be added in an amount known as a compounding agent as long as the physical properties of the composition of the present invention are not impaired. Type) or gel-free PU
Polymers such as R, AR and NBR may be added.

The method for producing the thermoplastic elastomer composition of the present invention requires that the polyester elastomer and the chlorinated polyethylene are uniformly kneaded, and the preparation method is not particularly limited, but ( 1) A chlorinated polyethylene composition is prepared by mixing a chlorinated polyethylene with a plasticizer in advance and kneading under shearing force while heating to a temperature above the crystalline melting point of the chlorinated polyethylene to prepare a chlorinated polyethylene composition. (2) A plasticizer and a rubber substance containing a gel component are mixed in advance with chlorinated polyethylene and sheared while being heated to a temperature above the crystalline melting point of chlorinated polyethylene. Under pressure, a chlorinated polyethylene composition is prepared by kneading, and the polyester elastomer is mixed with the chlorinated polyethylene composition at a temperature not higher than the crystal melting point of both. How mixed at temperature melt, or (3) polyester elastomer, a mixture of chlorinated polyethylene and a plasticizer, there is a further method of melt mixing at a temperature above the crystalline melting point of the polyester elastomers and chlorinated polyethylene both. In the present invention, the above (1)
Alternatively, the method (2) is optimal.

The above-mentioned compounding components, that is, the device used for mixing the chlorinated polyethylene powder and the plasticizer or the polyester elastomer may be any device as long as it can be uniformly mixed, for example, Henschel mixer, ribbon blender. , Planetary mixer,
A universal mixer and the like can be mentioned. Further, in order to knead the mixture, that is, the chlorinated polyethylene powder and the plasticizer alone, or the chlorinated polyethylene composition and the polyester elastomer both components, for example, a high-speed twin-screw extruder, a single-screw extruder, a co-kneader, a Banbury mixer, An apparatus such as a kneader that can knead under heating with shearing force is used. Of these, the extruder type is preferable.

The heating temperature during kneading is preferably a temperature above the crystalline melting points of both the polyester elastomer and the chlorinated polyethylene, and a temperature at which deterioration of the chlorinated polyethylene can be ignored, that is, 220 ° C. or less.

[0027]

EXAMPLES Next, the thermoplastic elastomer composition of the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples unless departing from the gist thereof. In addition, the quality evaluation of the thermoplastic elastomer composition was performed as follows and described in Table-1.

[0028]

[Table 1] Hardness: Based on JIS K-6253, it was measured with a type A hardness meter 10 seconds after the needle was inserted. Tensile properties: Based on JIS K-6251, a dumbbell No. 3 was used and the tensile speed was 200 mm / min, and the tensile strength and elongation at break were shown. Compression set (CS): Based on JIS K-6262
Measured at 70 ° C for 22 hours under 25% compression. Impact resilience: Measured at 23 ° C. based on JIS K-6255. Softening temperature: When a 1 mm diameter needle is heated at 5 ° C./min with a load of 5 g using a TMA device, it shows the temperature (° C.) at which it rapidly enters.

[0029]

[Table 2] The resin raw materials used are as follows. Polyester elastomer (indicated as TPEE in the table); using Fluxmer G-142 manufactured by Nippon Synthetic Chemical Industry Co., Ltd. Hard segment: Polybutylene terephthalate Soft segment: Polytetramethylene glycol having a number average molecular weight of about 1000 Weight ratio (hard / Soft): 1: 1, Crystal melting point: 180 ° C

[0030]

[Table 3] Chlorinated polyethylene (CPE); a Molecular weight of polyethylene before chlorination: 350,000, MFR (high load): 0.5, degree of chlorination: 31% by weight, heat of fusion of crystal: 8.3 cal / g, Crystal melting point: 118 ° C., DOP oil absorption: 50 or more b Molecular weight of polyethylene before chlorination: 200,000, MFR (high load): 10, Chlorination: 31% by weight, heat of fusion of crystal: 10.9 cal / g, crystal Melting point: 126 ° C., DOP oil absorption: 50 or more c Molecular weight of polyethylene before chlorination: 70,000, MFR (low load): 7.5, chlorination degree: 30% by weight, heat of fusion of crystal: 12 cal / g, crystal melting point : 123 ° C, DOP oil absorption: 50 or more d Molecular weight of polyethylene before chlorination: 250,000, MFR (high load): 8, Chlorination: 31% by weight, heat of crystal fusion: less than 0.5 cal / g, DOP oil absorption amount : 40

The above-mentioned chlorinated polyethylene is a chlorinated polyethylene composition (in the table, referred to as CPEE) A, B, C,
Used as D, E and F. Composition A: 100 parts by weight of chlorinated polyethylene a, 80 parts by weight of diisononyl phthalate and 3 parts by weight of barium-zinc stabilizer were mixed by a Henschel mixer, and the mixture was melt-kneaded at 80 rpm for 3 minutes with a Banbury mixer having a jacket of 120 ° C. The resin was discharged at a temperature of 180 ° C. It was sheeted with a roll and pelletized with a cutter. Composition B: Same as composition A except that the amount of diisononyl phthalate was 120 parts by weight. Composition C: Same as composition A except that chlorinated polyethylene b was used and the amount of diisononyl phthalate was 40 parts by weight. Composition D: Same as composition A except that chlorinated polyethylene c was used and the amount of diisononyl phthalate was 40 parts by weight. Composition E: Same as Composition A except that chlorinated polyethylene d was used and no plasticizer was used. Composition F; 100 parts by weight of chlorinated polyethylene a, 100 parts by weight of diisononyl phthalate, 50 parts by weight of NBR (acrylonitrile content of 40% by weight, THF solubility of 5% by weight) and 3 parts by weight of barium-zinc-based stabilizer were added to prepare a composition A. It pelletized similarly.

Examples 1 to 9 and Comparative Examples 1 to 4 Polyester elastomers of the types and parts by weight shown in Table 1 were mixed with a chlorinated polyethylene composition, and the mixture was heated at 200 ° C. in a 30 mmφ high-speed co-directional twin-screw extruder. It was melt-kneaded in and pelletized. The extrudate temperature was 210 ° C. Using a compression molding machine, the pellets were molded into a test piece having a thickness of 2 mm under a pressure condition of 200 ° C. for 5 minutes, and a quality evaluation test was performed using the test piece. The evaluation results are shown in Table 1.

[0033]

[Table 4] The weight ratios (%) of TPEE and CPE in Examples 1 to 9 are as follows.

[0034]

[Table 5]

It can be seen that the softening temperature is extremely increased by adding the polyester elastomer to the chlorinated polyethylene composition. It is also understood that the hardness is lowered and the compression set is improved by blending the polyester elastomer with the chlorinated polyethylene composition. Comparative Example 4 using amorphous chlorinated polyethylene
It is understood that, although the hardness is low, the compression set and the impact resilience are inferior.

[0036]

EFFECT OF THE INVENTION The thermoplastic elastomer composition of the present invention has good heat resistance of a polyester elastomer,
In addition to moldability and chemical resistance, good rubber elasticity is added,
Further, it exhibits the property of low hardness, while maintaining the good rubber elasticity of the crystalline chlorinated polyethylene, especially the crystalline chlorinated polyethylene composition, and it is possible to dramatically improve the softening temperature. INDUSTRIAL APPLICABILITY The thermoplastic elastomer composition of the present invention has a great utility value for parts that require rubber elasticity such as interior skin materials for automobiles and constructions, boots, cable coatings, and other packings, and that require heat resistance. high.

Claims (16)

[Claims] 1. A thermoplastic polyester elastomer consisting of a high melting point polyester segment and a low melting point polymer segment, 99 to 1% by weight, and a chlorination degree of 20 to 45% by weight, D.
A thermoplastic elastomer composition comprising 1 to 99% by weight of chlorinated polyethylene having an SC method crystal heat of fusion of 5 to 35 cal / g. 2. The thermoplastic elastomer composition according to claim 1, wherein the blending proportions of the thermoplastic polyester elastomer and chlorinated polyethylene are 90 to 10% by weight and 10 to 90% by weight, respectively. 3. The composition ratio of the high melting point polyester segment and the low melting point polymer segment in the thermoplastic polyester elastomer is in the range of 10 to 97% by weight of the former and 90 to 3% by weight of the latter. The thermoplastic elastomer composition according to. 4. The thermoplastic elastomer composition according to any one of claims 1 to 3, wherein the high melting point polyester segment is polybutylene terephthalate. 5. The thermoplastic elastomer composition according to any one of claims 1 to 4, wherein the low melting point polymer segment is polytetramethylene glycol. 6. The thermoplastic elastomer composition according to claim 1, wherein the polyethylene before chlorination has a weight average molecular weight of 10 to 750,000. 7. The melt flow rate (MFR) of polyethylene before chlorination of chlorinated polyethylene measured according to JIS K-7210, Condition 7 and Condition 4 is 0.1 or more and 10 or less, respectively. The thermoplastic elastomer composition according to claim 6. 8. A chlorinated polyethylene is used as an oil, di-2-
Oil absorption is 2 when using ethylhexyl phthalate
It is 5 or more, The thermoplastic elastomer composition in any one of Claim 1 thru | or 7. 9. The thermoplastic elastomer composition according to claim 1, further comprising a plasticizer. 10. The thermoplastic elastomer composition according to claim 8, wherein the content of the plasticizer is in the range of 5 to 200 parts by weight with respect to 100 parts by weight of chlorinated polyethylene. 11. The thermoplastic elastomer composition according to claim 1, which contains a rubber substance containing a cross-linking component which is insoluble in a good solvent for the uncross-linked rubber. 12. The thermoplastic elastomer composition according to claim 11, wherein the content of the rubber substance containing a crosslinking component is in the range of 20 to 400 parts by weight based on 100 parts by weight of chlorinated polyethylene. 13. The solubility of a rubber substance in a good solvent is 80.
13. The thermoplastic elastomer composition according to claim 11 or 12, which is at most wt%. 14. The thermoplastic elastomer composition according to any one of claims 11 to 13, wherein the rubber substance is an acrylonitrile-butadiene copolymer. 15. A thermoplastic elastomer composition according to claim 1, wherein a chlorinated polyethylene containing a plasticizer in advance and a thermoplastic polyester elastomer are kneaded. Method. 16. The method according to claim 1, wherein chlorinated polyethylene containing a rubber substance containing a plasticizer and a cross-linking component in advance is kneaded with a thermoplastic polyester elastomer. A method for producing the thermoplastic elastomer composition.