JPH11116781A - Thermoplastic elastomer resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer resin composition which can give moldings excellent in heat resistance, water resistance, flexibility, mechanical properties and appearance. SOLUTION: There is provided a thermoplastic elastomer composition prepared by mixing a thermoplastic polyester elastomer with a polyethylene resin and satisfying the formula: 3<=(A/B)×C<=60,000 (wherein A is the melt flow index (at 230 deg.C under a load of 2.16 kg) of the thermoplastic polyester elastomer), B is the melt flow index (at 190 deg.C under a load of 10 kgf) of the polyethylene resin, and C is the surface hardness (Shore D) of a resin composition obtained by mixing the thermoplastic polyester elastomer with the polyethylene resin).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a thermoplastic elastomer resin composition having excellent heat resistance, colorability, moldability and flexibility. Examples of the use thereof include an extrusion molded product, a blow molded product, and an injection molded product which require the above performance.

[0002]

2. Description of the Related Art Polyester elastomers are generally excellent in flexibility, heat resistance and oil resistance, but are known to have poor water resistance. On the other hand, olefin resins such as polyethylene resins have excellent water resistance and mechanical strength,
It is known that flexibility and heat resistance are poor. However, it is known that, when a polyester elastomer and a polyethylene resin are simply melt-mixed, not only the excellent properties of each are not sufficiently exhibited, but also the compatibility is poor, and the physical properties and the appearance of a molded product are deteriorated.

[0003]

In general, when a mixture of a thermoplastic polyester elastomer and a polyethylene resin is extruded or molded, the problem of poor appearance due to poor compatibility is eliminated, and the heat resistance is improved. The present invention provides a thermoplastic elastomer composition having excellent flexibility, mechanical properties, and moldability.

[0004]

The present invention provides a thermoplastic elastomer resin composition comprising a thermoplastic polyester elastomer and a polyethylene resin, wherein the composition satisfies the following formula (1). Is a thermoplastic elastomer resin composition. (Equation 1) 3 ≦ (A / B) × C ≦ 60000 A: Melt flow index of thermoplastic polyester elastomer (230 ° C., 2.16 kgf) B: Melt flow index of polyethylene resin (1)
90 ° C, 10 kgf) C: Surface hardness of resin composition obtained by blending thermoplastic polyester elastomer and polyethylene resin (Shore
D)

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic polyester elastomer in the present invention is a polyester block copolymer composed of a high melting point hard polyester segment and a low melting point polymer segment having a molecular weight of 400 to 6000, and a high melting point polyester segment component. Melting point when forming a high polymer alone is 150 ° C. or higher, and melting point or softening point when measured only with the low melting point polymer segment component is 80 ° C. or lower. It is united.

The polyester block copolymer will be described in more detail. For example, terephthalic acid, isophthalic acid,
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, polylactones such as polypivalolactone, polyethers prepared from aromatic ether dicarboxylic acids such as 1,2-bis (4,4'-dicarboxyphenoxy) ethane and the aforementioned diols. Examples thereof include ether esters, and copolyesters obtained by combining the above dicarboxylic acids, oxy acids, and diols.

[0007] Examples of low-melting polymer segment constituents 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. Further, polyesters prepared from aliphatic dicarboxylic acids having 2 to 12 carbon atoms and aliphatic glycols having 2 to 10 carbon atoms, such as polyethyne adipate, polytetramethylene adipate, polyethylene sebacate, polyneopentyl sebacate, and polytetramethylene Examples include dodecane, polytetramethylene azelate, polyhexamethylene azelate, poly-ε-caprolactone, and the like. Further, a polyester polyether copolymer obtained by combining the above polyester and polyether can also be shown. The ratio of the low-melting-point polymer segment component in the polyester block copolymer is 5 to 80.
% By weight is preferred.

[0008] These polyester block copolymers can be produced by a usual polycondensation method. A preferred method is to heat an aromatic dicarboxylic acid or its dimethyl ester, a low melting segment forming diol and a molecular weight diol to a temperature of about 150-260 ° C. in the presence of a catalyst, and then form by a polycondensation or transesterification reaction. A method of removing a water or methanol, heating the resulting prepolymer under vacuum to remove excess low molecular weight diol to obtain a polyester type block copolymer having a high degree of polymerization, a pre-adjusted high melting polyester. A segment-forming prepolymer and a low-melting polymer A segment-forming prepolymer is mixed with a bifunctional compound that reacts with the terminal functional group of the prepolymer, and then the system is kept at a high vacuum to remove volatile components. To obtain a polyester-type block copolymer by a high degree of polymerization It was heated mixing point polyester and a lactone monomer, and a method of the lactone while opening polymerization ester block copolymers.

The polyethylene resin used in the present invention includes low-density polyethylene, medium-density polyethylene, and high-density polyethylene, and olefin copolymers composed of α-olefins and α, β-unsaturated glycidyl esters. Can be As high-density polyethylene resin, 30 to 10
Examples thereof include a method of polymerizing at a medium pressure of 0 atm and a polyethylene resin obtained by polymerization at normal pressure at 100 ° C or lower, and those having a specific gravity in the range of 0.91 to 0.925. Examples of the low-density polyethylene resin include a polyethylene resin obtained by polymerization at an ultra-high pressure of 1000 atm or more,
It has many side chains in the main chain and has a specific gravity of 0.92 to 0.
965. In particular, when a high-density polyethylene resin is used, fluctuations in the diameter of the strand or tube during extrusion are small, which is preferable.

The thermoplastic elastomer resin composition of the present invention has the following formula (1): 3 ≦ (A / B) × C ≦ 60000 A: Melt flow index of thermoplastic polyester elastomer (230 ° C., 2.16 kgf) B: Polyethylene Melt flow index of resin (1
90 ° C, 10 kgf) C: Surface hardness of resin composition obtained by blending thermoplastic polyester elastomer and polyethylene resin (Shore
By satisfying D), a thermoplastic elastomer resin composition which is flexible and has good moldability can be obtained. When the value exceeds the range of the expression 1, the compatibility is poor, and problems such as poor appearance of the molded product occur.

The composition ratio of the composition of the present invention is preferably 50 to 90% by weight of the thermoplastic polyester elastomer composition and 10 to 50% by weight of the polyethylene resin. If the composition ratio of the thermoplastic polyester elastomer composition and the polyethylene-based resin deviates, the compatibility becomes difficult. A in the formula is 0.1 to 30 g / 10 min, and B is 0.01 to 30 g / 10 min.
The range is preferably 30 g / 10 minutes, particularly 0.5 to 5 g /
A range of 10 minutes is more preferable because there is no change in the strand diameter during extrusion. C is preferably in the range of 30 to 70 D, and in particular, a resin composition having a surface hardness in the range of 40 to 60 D is more preferable since it does not have poor appearance during molding.

The resin composition of the present invention can be mixed using a kneader such as a heating roll, an extruder, and a Banbury mixer. Further, the composition of the present invention includes known antioxidants such as hindered phenols, sulfur, and neighbors as additives, hindered amines, triazoles, benzophenones, benzoates, nickels, and salicyls. Light stabilizers, antistatic agents, lubricants, molecular regulators such as peroxides, metal deactivators, organic and inorganic nucleating agents, neutralizing agents,
One or more antacids, antibacterial agents, optical brighteners, fillers, flame retardants, flame retardant auxiliaries, and the like can be added.

Hindered phenolic antioxidants The hindered phenolic antioxidants which can be incorporated into the resin composition of the present invention include 3,5-di-t-
Butyl-4-hydroxy-toluene, n-octadecyl-β- (4′-hydroxy-3 ′, 5′-di-tert-butylphenyl) propionate, tetrakis [methylene-
3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 1,3,5-trimethyl-2,4,6'-tris (3,5-di-t-butyl -4-hydroxyhydroxy) benzene, calcium (3,5-di-t-butyl-4-hydroxy-benzyl-monoethyl-phosphate), triethylene glycol-bis [3- (3-t-butyl-5 -Methyl-4-hydroxyphenyl) propionate], 3,9-bis [1,1-dimethyl-2- {β- (3-t-butyl-4)
-Hydroxy-5-methylphenyl) propionyloxydiethyl] 2,4,8,10-tetraoxaspiro [5,5] undecane, bis [3,3-bis (4′hydroxy-3′-t-butylphenyl) ) Butyric acid] glycol ester, tocopherol, 2,2′-ethylidenebis (4,6-di-t-butylphenol), N, N′-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) ) Propionyl] hydrazine, 2,2′-oxamidobis [ethyl-3- (3,5-di-t-butyl-4)
-Hydroxyphenyl) propionate], 1,1,3
-Tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane, 1,3,5-tris (3 ', 5'
-Di-t-butyl-4'-hydroxybenzyl) -S-
Triazine-2,4,6 (1H, 3H, 5H) -trione, 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate,
3,5-di-t-butyl-4-hydroxyhydrocinnamic acid triester with-1,3,5-tris (2-hydroxyethyl) -S-triazine-2,4
6 (1H, 3H, 5H) and the like.

Sulfur-based antioxidants Examples of the sulfur-based antioxidants which can be incorporated in the resin composition of the present invention include dilauryl-3,3'-thiodipropionate, dimyristyl-3,3'-thiol. Dipropionate, distearyl-3,3'-thiodipropionate, laurylstearyl-3,3 '
-Thiodipropionate, dioctadecyl sulfide, pentaerythritol-tetra (β-lauryl-thiopropionate) ester and the like.

Neighboring antioxidants The neighboring antioxidants which can be incorporated in the resin composition of the present invention include tris (mixed, mono and dinolylphenyl) phosphite and tris (2,3-di -T
-Butylphenyl) phosphite, 4,4'-butylidene-bis (3-methyl-6-tert-butylphenyl-di-tridecyl) phosphite, 1,1,3-tris (2-methyl-4-di-) Tridecylphosphite-5
-T-butylphenyl) butane, bis (2,4 di-t
-Butylphenyl) pentaerythritol-di-phosphite, tetrakis (2,4-di-t-butylphenyl) -4,4′-biphenylenephosphanite, bis (2,6-di-t-butyl-4-) Methylphenyl) pentaerythitol-di-phosphite, 2,2′-ethylidene-bis (4,6-di-t-butylphenyl) -2
-Ethylhexyl-phosphite, bis (2,4,6
-Di-t-butylphenyl) pentaerythritol-di-phosphite, triphenyl phosphite, diphenyldecyl phosphite, didecylphenyl phosphite, tridecyl phosphite, trioctyl phosphite, tridodecyl phosphite, trioctadecyl phosphite Phyto, trinonyl phenyl phosphite, tridodecyl trithio phosphite and the like can be mentioned.

Hindered amine light stabilizers Hindered amine compounds that can be incorporated in the resin composition of the present invention include dimethyl succinate and 1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6 Polycondensate with tetramethylpiperodine, poly [[6-
(1,1,3,3-tetrabutyl) imino-1,3,5
-Triazine-2,4-diyl] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl)
Imyl]], bis (1,2,2-bis (2-n-butylmalonic acid)
2,6,6-pentamethyl-4-piperidyl) ester, tetrakis (2,2,6,6-tetramethyl-4-)
Piperidyl) -1,2,3,4-butanetetracarboxylate, bis (2,2,6,6-tetramethyl-4-)
Piperidyl) sebacate, N, N'-bis (2,2,
Polycondensate of 6,6-tetramethyl-4-piperidyl) hexamethylenediamine and 1,2-dibromoethane, poly [(N, N'-bis (2,2,6,6-tetramethyl-4- Piperidyl) hexamethylenediamine)-(4-
Monophorino-1,3,5-triazine 2,6-diyl)
-Bis (3,3,5,5-tetramitylpiperazinone), tris (2,2,6,6-tetramethyl-4-piperidyl) -dodecyl-1,2,3,4-butanetetracarboxylate , Tris (1,2,2,6,6-pentamethyl-4-piperidyl) -dodecyl-1,2,3,
4-butanetetracarboxylate, bis (1,2,2
2,6,6-pentamethyl-4-piperidyl) sebacate, 1,6,11-tris [｛4,6-bis (N-butyl-N- (1,2,2,6,6-pentamethylpiperidine- 4-yl) amino-1,3,5-triazine-2-
Il @ amino] undecane, 1- [2- [3-5-di-
t-butyl-4-hydroxyphenyl) propionyloxy] -2,2,6,6-tetramethylpiperidine, 8
-Benzyl-7,7,9,9-tetramethyl-3-octyl-1,3,8-triazaspiro [4,5] undecane-2,4-dione, 4-benzoyloxy-2,2
6,6-tetramethylpiperidine, N, N'-bis (3
-Aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidyl) amino] -6-chloro-1,3,3
5-triazine condensate and the like can be mentioned.

The present invention relates to a light stabilizer such as a triazole, benzophenone, benzoate, nickel or salicylic acid which can be incorporated in the resin composition of the present invention. A triazole, benzophenone, benzoate, nickel or salicylic acid is used. Light stabilizers such as 2,2′-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, pt-butylphenyl salicylate, and 2,4-di-t-butylphenyl -3,5-di-t-butyl-4-hydroxybenzoate, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-
3 ', 5'-di-t-amylphenyl) benzotriazole, 2- (2'-hydroxy-3'-t-butyl-
5′-methylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5-chlorobenzotriazole, 2,
5-bis- [5'-t-butylbenzoxazolyl-
(2)]-thiophene, [bis (3,5-di-t-butyl-4-hydroxybenzylphosphoric acid monoethyl ester)]
Nickel salt, 2-ethoxy-5-t-butyl-2'-ethyloxalic acid-bis-anilide 85-90
% And 2-ethoxy-5-t-butyl-2'-ethyl-
4'-t-butyloxalic acid-bis-anilide 10-15% mixture, 2- (3,5-di-t-butyl-2-hydroxyphenyl) benzotriazole,
-[2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2
-Ethoxy-2'-ethyloxalic acid bisanilide, 2- [2'hydroxy-5'-methyl-3'-
(3 ″, 4 ″, 5 ″, 6 ″ -tetrahydrophthalimido-methyl) phenyl] benzotriazole, bis (5-benzoyl-4-hydroxy-2-methoxyphenyl) methane, 2- (2′- Hydroxy-5'-t-
(Octylphenyl) benzotriazole, 2-hydroxy-4-i-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2-hydroxy-4-octadecyloxybenzophenone, and the like.

Antistatic agent Antistatic agent which can be incorporated in the resin composition of the present invention.
Glycerin fatty acid (C₈ ~ C_{twenty two}) Esthetic
Sorbitan fatty acid (C₈ ~ C_{twenty two}) Ester, propyl
Ren glycol fatty acid (C₈ ~ C_{twenty two}) Ester, sucrose
Acid fatty acid (C₈ ~ C_{twenty two}) Ester, citric acid mono
Is tri) stearyl ester, pentaerythritol fat
Fatty acid (C₈ ~ C₁₈) Ester, trimethylolpropane
Fatty acids (C ₈ ~ C₁₈) S, polyglycerin fatty acid
(C₈ ~ C_{twenty two}) Ester, polyoxyethylene (20
Le) glycerin fatty acid (C₁₂~ C₁₈) Ester, oily
Oxyethylene (20 mol) sorbitan fatty acid (C₁₂~
C₁₈) Esters, polyethylene glycol fatty acids (C₈ 
~ C_{twenty two}) Ester, polyoxyethylene fatty alcohol
(C₁₂~ C₂₀) Ether, polyoxyethylene (4-5
0 mol) alkyl (C _Four Phenyl ether, N,
N-bis (2-hydroxyethyl) fat (C₈~ C₁₈)
Condensation of amines and fatty acids with diethanolamine
Material, polyoxypropylene polyoxyethylene block
Polymer, polyethylene glycol, polypropylene
Nonionic surfactants such as recall; alkyl (C_Ten
~ C₂₀) Sulfonate (Na, K, NH_Four ), Alkyl
Naphthalene sulfonate (Na), sodium dialkyl
(C_Four ~ C₁₆) Sulfone succinate, alkyl (C₈ 
~ C ₂₀) Sulfate (Na, K, NH)_Four ),fatty acid
(C₈ ~ C_{twenty two}) Salt (Na, K, NH_Four ) Etc. anionic
Surfactant; N-acyl (C₈ ~ C₁₈) Sarcosinate
Zwitterionic surfactants such as polyacrylic acid and its
Other auxiliaries such as thorium salts can be used.

Lubricants Lubricants that can be incorporated into the resin composition of the present invention include hexylamide, octylamide, stearylamide, oleylamide, ercylamidoethylenebisstearylamide, laurylamide, behenylamide, methylenebisstearyl. C3-30 saturated or unsaturated aliphatic amides such as amide and ricinolamide and derivatives thereof; C3-30 saturated or unsaturated aliphatic esters such as butyl stearate and isobutyl stearate and derivatives thereof A commercially available silicone release agent; a silicone compound such as silicone oil and silicone gum; a commercially available fluorine-based release agent, and a fluorine-based compound such as ethylene tetrafluoride.

Metal deactivator The metal deactivator which can be incorporated in the resin composition of the present invention includes 3-N'-salicyloylamino-1,
2,4-triazole, salicylaldehyde, salicylhydrazine, N, N'-bis- [3- (3,5-di-t
-Butyl-4-hydroxyphenyl) propionyl] hydrazine, oxalyl-bis [benzylidene hydrazide], 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 3,4,5,6
-Dibenzo-1,2-oxaphosphan-2-oxide, tris [2-t-butyl-4-thio (2'-methyl-4'-hydroxy-5-t-butyl) phenyl-5
-Methyl] phenylphosphite, 2,2′-oxamido-bis- [ethyl-3 (3,5-di-t-butyl-
4-hydroxyphenyl) propionate].

Nucleating agents The nucleating agents that can be incorporated in the resin composition of the present invention include 1,3,2,4-di-benzylidene-sorbitol and 1,3,2,4-di-di- (P-methyl-benzylidene) sorbitol, 1,3,2,4-di- (p-ethyl-benzylidene) sorbitol, 1,3,2,4-di- (2 ′, 4′-di-methyl-benzylidene) ) Sorbitol, 1,3-p-chloro-benzylidene-2,4-p
-Methyl-benzylidene-sorbitol, 1,3,2
4-di- (p-propyl-benzylidene) sorbitol, aluminum-mono-hydroxy-di-pt-butylbenzoate, sodium-bis (4-t-butylphenyl) phosphate, sodium-2,2'-methylene -Bis- (4,6-di-t-butyl-phenyl) phosphate, talc, sodium benzoate, lithium-
2,2'-methylene-bis- (4,6-di-t-butylphenyl) phosphate and the like can be mentioned.

Neutralizers and antacids The neutralizers and antacids which can be incorporated in the resin composition of the present invention include lithium stearate, 1,2-hydroxylithium stearate, sodium stearoyl lactate, Sodium stearate, potassium stearate,
Lithium behenate, lithium montan, sodium behenate, sodium montanate, calcium stearyl lactate, calcium behenate, calcium montanate, cadmium stearate, cadmium laurate, cadmium ricinoleate, barium naphthenate, barium 2-ethylhexoate, stearin Barium acid, barium 2-ethylhexoate, calcium stearate, calcium laurate, calcium ricinoleate, strontium stearate, zinc stearate, zinc laurate, zinc ricinoleate, zinc 2-ethylhexoate,
Higher fatty acids such as zinc stearate, dibasic lead stearate, lead naphthenate, tin stearate, aluminum stearate, and magnesium stearate; alkali or alkaline earth metal salts of alkyl lactic acid; basic magnesium aluminum hydroxide Carbonate hydrate (hydrotalcite), basic zeolite,
Examples thereof include epichlorohydrin and bisphenol A polymers, epoxidized soybean oils, epoxidized fatty monoesters, epoxidized alicyclic fatty acid esters, polycarbodiimides, and isocyanate compounds.

Filler The filler that can be blended in the resin composition of the present invention includes magnesium oxide, aluminum oxide, silicon oxide, calcium oxide, titanium oxide, chromium oxide (3
Value), iron oxide, zinc oxide, silica, diatomaceous earth, alumina fiber, antimony oxide, barium ferrite, strontium ferrite, beryllium oxide, pumice, pumice balloon and other oxides, magnesium hydroxide, aluminum hydroxide,
Basic substances or hydroxides such as basic magnesium carbonate; carbonates such as magnesium carbonate, calcium carbonate, barium sulfate, ammonium sulfate, calcium sulfite, dolomite, dawsonite; calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite, basic sulfuric acid (Sulfite) such as magnesium; silicic acid such as sodium silicate, magnesium silicate, aluminum silicate, potassium silicate, calcium silicate, talc, clay, mica, asbestos, glass fiber, montmorillolite, glass balloon, glass beads, pentonite, etc. Salt; kaolin (porcelain), pearlite, iron powder, copper powder, lead powder, aluminum powder, molybdenum sulfide, boron fiber, silicon carbide fiber, brass fiber, potassium titanate, lead zirconate titanate, zinc borate, aluminum borate, Metabo It can be barium, calcium borate, sodium borate and the like.

[0024]

Next, the present invention will be described with reference to the following examples.
Physical properties were measured according to the following standards. Surface hardness ASTM-D-2240 method Stress at 50% elongation JIS K6251 Melt viscosity: Melt flow index (MFI) ASTM-D-1238 method Water resistance A 1 mm thick test piece is immersed in 100 ° C boiling water to maintain its shape. The number of days spent was measured. The thermoplastic polyester block copolymer used in the examples is as shown below. Polymer A: dimethyl terephthalate 60 parts, 1,4-
To 31 parts of butanediol and 35 parts of poly (tetramethylene oxide) glycol having a molecular weight of about 1000, tetrabutyl titanate is used as a metal titanium as a catalyst so as to be 150 ppm with respect to a produced polymer. Transesterification was performed. Next, a hindered phenol-based stabilizer [Ciba Geigy Co., Ltd. product;
0] was added in the form of a slurry of 1,4-butanediol in an amount of 0.2 parts by weight,
Melt polymerization was performed at 0 to 250 ° C to obtain a polymer. In this way, three different melt viscosity polymers were obtained. Polymer B: 50 parts of polybutylene terephthalate and 50 parts of ε-caprolactone having different average molecular weights are reacted with 1 part of dibutyltin dilaurate as a catalyst under a nitrogen atmosphere at 220 to 240 ° C. for 2 hours to obtain polymers having different melt viscosities. Obtained.

A high-density polyethylene having different melt viscosities and polymers A and B are kneaded using a twin-screw extruder to produce a composition, a test piece is prepared by injection molding, and used for physical property measurement. did. Polymer A:

[0026]

[Table 1] Polymer B:

[0027]

[Table 2]

[0028]

According to the present invention, by combining a thermoplastic polyester elastomer having a specific melt viscosity with a polyethylene resin, compatibility can be improved, heat resistance, water resistance, mechanical properties are excellent, and a molded article is obtained. A thermoplastic elastomer resin composition having excellent appearance can be obtained.

Claims (3)

[Claims] 1. A thermoplastic elastomer resin composition comprising a thermoplastic polyester elastomer and a polyethylene resin, wherein the composition satisfies the following formula 1. (Equation 1) 3 ≦ (A / B) × C ≦ 60000 A: Melt flow index of thermoplastic polyester elastomer (230 ° C., 2.16 kgf) B: Melt flow index of polyethylene resin (1)
90 ° C, 10 kgf) C: Surface hardness of resin composition obtained by blending thermoplastic polyester elastomer and polyethylene resin (Shore
D) 2. A thermoplastic elastomer resin composition, wherein (A / B) × C satisfies the following formula 2. (Equation 2) 10 <(A / B) × C <30000 3. The ratio A / B in the expression 2 of claim 2 is 0.3 to 50.
A thermoplastic elastomer resin composition, characterized in that: