KR100362824B1 - Manufacturing Method of Thermoplastic Elastomer of Polyolefin Substrate - Google Patents

Abstract

Thermoplastic consisting of a polyolefin-polyacrylate blend obtained by absorbing acrylate monomer, initiator and finally diacrylate into polyolefin particles, raising the temperature and then polymerizing acrylate to polyolefin to form a dispersed phase. Elastomer.

Description

Method for producing thermoplastic elastomer based on polyolefin

The present invention relates to thermoplastic elastomers based on polyolefins, which can be prepared without a separate vulcanization step, contain polyacrylates in a dispersed phase, and can be achieved by polymerizing acrylates into a polyolefin matrix.

Thermoplastic elastomers are polymers with superior processing properties of thermoplastics, but have the same physical properties as vulcanized rubber. This combination of properties can be achieved by having the material at the same time having a soft, elastic segment with a low glass transition temperature tg and a rigid crystalline segment with a high glass transition temperature or high melting point. Because rigid and smooth segments are thermodynamically incompatible with each other, they form separate phases. Thermoplastic elastomers, unlike conventional rubbers, do not require any separate vulcanization step and can be processed into other articles by processing methods commonly used in thermoplastic materials such as extrusion, injection molding and blow molding. In contrast to rubber, thermoplastic elastomers can be reworked if necessary, for example by recycling the material in the processing step.

Thermoplastic elastomers can be divided into two main classes, block copolymers and thermoplastic / elastomer blends. Examples of block copolymers well known as thermoplastic elastomers are block copolymers (SBS) polymerized with anions of styrene and butadiene and their hydrogenated substances (SEBS). At room temperature, the soft elastic phase in these polymers is in the continuous phase, while the rigid phase, polypropylene, is dispersed. Rigid polystyrene gives the material strength. During processing, the temperature is higher than the glass transition temperature of polystyrene and the material may melt and flow. Because of the butadiene double bonds of SBS, these thermoplastic elastomers have low weatherability. Since polybutadiene and its hydrogenate in SBS and SEBS are continuous phases, both have low oil resistance. Another disadvantage of SEBS is the complexity of the manufacturing method and the high cost thereof.

Examples of materials belonging to another major class of thermoplastic elastomers, namely thermoplastic / elastomer blends, include blends of polypropylene and ethylene / propylene rubber or ethylene / propylene / diene rubber. In these blends, the rigid polypropylene phase is in a continuous phase and the soft phase is dispersed. Since the continuous phase is polypropylene, the material has excellent oil resistance. These blends are obtained by blending two main components and various additives in an extruder. Phase separation is stabilized by curing the dispersed rubber phase (see US Pat. No. 4,594,390).

The present invention describes a method for producing a thermoplastic elastomer having a polyolefin as the continuous phase and a polyacrylate such as rubber as the dispersed phase. This product is produced in the reactor and may be pre-crosslinked during polymerization in the reactor, if desired. Thus no vulcanization step is required. Since the polyolefin is a continuous phase and the elastomer in the product is a polyacrylate, the product has excellent oil resistance and weather resistance.

Thus, the present invention makes it possible to produce thermoplastic elastomers based on polyolefins having polyacrylate as a dispersed phase, without undergoing a separate vulcanization step. In this method, the acrylate is polymerized into a polyolefin matrix. Acrylate is an acrylate that is elastic and has a glass transition temperature below room temperature. When the acrylates are polymerized, they form a dispersed phase in the polyolefin matrix. Since the acrylates are polymerized by free radical polymerization techniques, some of the acrylate chains are crosslinked to the polyolefin chains, resulting in good adhesion between the polyolefin continuous phase and the polyacrylate dispersed phase. By using this acrylate with a small amount of diacrylate, the polyacrylate dispersed phase can be crosslinked by the desired amount.

This unique novelty of the present invention is that by polymerizing the acrylate to the polyolefin matrix, a polyolefin / polyacrylate blend is obtained in which the polyolefin is in the continuous phase and the polyacrylate is in the dispersed phase, and as a result the material has thermoplasticity. . Moreover, this material is characterized in that the dispersed elastic polyacrylate phase can be crosslinked during the polymerization step and thus can be processed so that the structure of the dispersed polyacrylate moiety is not destroyed. Crosslinking on the polyacrylate is particularly important when the adhesion between the polyolefin matrix and the polyacrylate is expected to be low, such as when the polyolefin is a single polyethylene or polypropylene. By heating during processing, the polyolefin melts and fluidizes, but the soft dispersed polyacrylate is crosslinked and thus maintains its dispersion.

The actual production of such materials can be carried out using some of the methods described in patent literature such as Finland patent 88170 in which monomers are polymerized into polyolefin matrices by free radical polymerization techniques. In principle, this preparation process is carried out so that the acrylate monomer, and optionally the diacrylate monomer, and the initiator are absorbed into the polyolefin particles. The impregnation temperature is so low that decomposition of the initiator does not occur but is high enough so that the monomer and initiator can permeate the polyolefin particles. When all monomers and initiators are absorbed, the temperature rises, the initiators decompose and polymerization of acrylates begins. During the impregnation process the polyolefin particles swell to some extent depending on the amount of monomer added. However, the particles retain their particle structure and also the polymerization reaction during the impregnation process.

The invention is explained in more detail below.

Polyolefin

Useful polyolefins include high density polyethylene, low density polyethylene and linear low density polyethylene. The polyethylene may be a homopolymer or a copolymer. Comonomers of ethylene include vinyl acetate, vinyl chloride, propylene or other * -olefins, C ₁ -C ₇ -alkylacrylates and -methacrylates, acrylic acid and methacrylic acid, hydroxy alkylacrylates and -methacrylates, Glycidylacrylate and -methacrylate, hexadiene-1,4, hexadiene-1,5, heptadiene-1,6, 2-methylpentadiene-1,4, octadiene-1,7, 6 Dienes such as -methylheptadiene-1,5 and polyenes such as octatriene and dicyclopentadiene. Also useful are ethylene-*-olefin-polyene-terpolymers. Useful * -olefins include propylene, butene, pentene, isoprene, hexene or mixtures thereof. Useful polyenes include hexadiene-1,4, hexadiene-1,5, heptadiene-1,6, 2 -Methylpentadiene-1,4, octadiene-1,7, 6-methylheptadiene-1,5, octatriene, dicyclopentadiene can be mentioned. If the ethylene polymer is a copolymer, the content of ethylene should be at least 50% by weight.

The polyolefin may also contain polypropylene and copolymers thereof. The propylene copolymer should consist of at least 50% by weight propylene and can be a random or block copolymer of propylene and ethylene. Other * -olefins can also be used as comonomers, hexadiene-1,4, hexadiene-1,5, heptadiene-1,6, 2-methylpentadiene-1,4, octadiene-1,7 And dienes such as 6-methylheptadiene-1,5 and polyenes such as octatriin and dicyclopentadiene may be used.

The polyolefin may have any form, but pellet forms having a diameter of 0.5 to 10 mm are most suitable. When the polyolefin is in the form of particles, washing and drying with ash are easy after treatment.

Acrylate monomer

Suitable monomers are acrylates and methacrylates, the polymers of which have low glass transition temperatures. That is, they exhibit rubbery properties at room temperature and at low temperatures, preferably below -20 ° C. Since the glass transition temperature of the polyacrylate defines the low operating temperature of the material, below the glass transition temperature, the polyacrylate is rigid and inelastic, and the elasticity of the material is lost. Suitable acrylates are alkylacrylates having one or preferably two or more carbon atoms in the alkyl chain. Methacrylates having sufficiently low glass transition temperatures are alkylmethacrylates having at least 4 or preferably at least 8 carbon atoms in the alkyl chain. These monomers may be used alone or in combination of two or more monomers. In addition to the monomers mentioned above, smaller amounts of monomers with less carbon atoms in the carbon chain can also be used. Thus, the glass transition temperature of the final product can be adjusted. As comonomers, acrylates and methacrylates may be further used, except that they have ester bonds or other polar groups such as alkoxy or hydroxy groups. Examples thereof are methoxy- and ethoxyacrylate, hydroxyethyl- and hydroxypropyl methacrylate. By using such comonomers, the oil resistance of the product can be improved. Small amounts of other non-acrylate monomers polymerizable by free radical polymerization techniques can also be copolymerized with the acrylates and methacrylates mentioned above.

Amount of acrylate

In principle, as small amounts of acrylate as desired can be added. However, in order to obtain the material which is a thermoplastic elastomer, an amount of tens of percent must be added. The amount of acrylate polymerized to the polyolefin may also vary depending on the polyolefin used and the addition of possible oils. Polypropylene based materials without oil and filler added according to the invention require 50 to 90% by weight of acrylate and the content of polypropylene is thus 50 to 10% by weight. For thermoplastic elastomers based on polyethylene according to the invention, the required amount of acrylate depends on polyethylene, with or without the presence of comonomers. If no oil and filler is added, the amount of acrylate can vary from 50 to 90% by weight for single polyethylene and from 20 to 90% by weight for polyethylene containing up to 30% by weight comonomer. The effect of the amount of acrylate due to its softness and other properties can be clearly seen from the experiment.

Addition of oil

The oil is softened by the addition of oil. In addition, the amount of acrylate may be reduced compared to the amount of polyolefin to obtain a certain degree of softness by oil addition. The amount of oil added can be 0 to 40% by weight in the final product. The oil may be added together with the acrylate and the initiator and thus permeate the polyolefin particles during the impregnation and / or polymerization process. The oil can also be added to the reactor only after the final polymerization reaction and can be impregnated into the polyolefin-polyacrylate particles at high temperature. Moreover, the method of adding oil to the polyolefin-polyacrylate particles is carried out in an extruder. Usable oils may be oils commonly used to soften rubber, such as paraffinic, naphthenic, aromatic and synthetic oils, as well as plasticizers for thermoplastic materials such as dioctylphthalate.

Addition of filler

Moreover, the method of modifying the material so that the properties of the product become desirable is the addition of fillers. By the addition of fillers, for example, the rigidity and the operating temperature can be raised. Fillers may be added to the polyolefin-polyacrylate blend in the extruder. Of course, the filler may be contained in the polyolefin used as the raw material for polymerization. Conventional fillers such as talc, kaolin, CaCO ₃ , silica can be used. The amount of filler can be from 0 to 70% by weight of the final product.

Composition ratio of the final product

The final product may thus contain oils and fillers in addition to polyolefins and polyacrylates. Thus, the amount of polyolefins and polyacrylates in the final product can vary considerably depending on the amount of oils and fillers and also the polyolefins selected. If the polyolefin is polypropylene, the ratio of polypropylene / polyacrylate may be 0.1 to 2. If the polyolefin is polyethylene, the ratio can be 0.1 to 5.

Crosslinking of Polyacrylates

Some acrylates spontaneously form gels even without the use of diacrylates. In such a case, it is not always necessary to use diacrylate to crosslink the polyacrylate. A well known literature example of acrylates which spontaneously form gels is butyl acrylate. The need to use diacrylates also depends on the adhesion between the dispersed polyacrylate and the polyolefin continuous phase.

If the adhesion between phases is excellent, the tendency of the dispersed polyacrylates to agglomerate to form a larger phase structure is less than if the adhesion is poor. If the polyolefin is a polyethylene containing a polar group, excellent adhesion can be obtained, so only a small amount of diacrylate may be needed or not at all. If the polyolefin is a single polyethylene or polypropylene, since the adhesion between phases is small, it does not form agglomerated or large lumps of polyacrylate blocks and is a dispersed polyacryl in which the polyacrylate is a continuous phase or at least a permeate phase without phase transformation. The polyacrylate must be crosslinked with diacrylate to allow for processing of the rate. Crosslinking can most conveniently be done in advance in the reactor by adding acrylates having two or more double bonds. During the polymerization process, these acrylates having two or more double bonds can be polymerized into different polyacrylate chains so that the polyacrylate particles can be crosslinked. Examples of suitable crosslinkers are hexanediol diacrylate or dimethylacrylate. The amount of crosslinker is from 0 to 15% by weight, based on the amount of acrylate. Since the amount of crosslinking agent may be rather low, other monomers, such as divinylbenzene, having two or more double bonds which do not significantly affect the properties of the product besides the multifunctional acrylate may also be used.

Initiator

Initiators used to polymerize acrylates are initiators commonly used in free radical polymerization of vinyl monomers, such as benzoyl peroxide, lauroyl peroxide, t-butylperbenzoate, t-butyl-peroxy-2-ethylhexane Et, t-butylperoxide, dicumyl peroxide, di-t-butylperoxide, bis (t-butylperoxyisopropyl) benzene, t-butylperoxyisopropylcarbonate, 2,5-dimethyl-2 Organic peroxides such as, 5-di-t-butylperoxyhexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexin-3, and azobisisobutyronitrile and azobisdimethyl Azo compounds, such as valeronitrile, are mentioned.

One or more initiators can be used at the same time so that the polymerization reaction can be started at a low temperature by the "low temperature initiator" and then started at a high temperature by the "high temperature initiator". The amount of initiator may be 0.001 to 2% by weight, preferably 0.1 to 1% by weight, based on 100 parts by weight of the monomer.

Manufacturing Process Including Impregnation and Polymerization

In principle, the preparation of such polyolefin-polyacrylate materials can be carried out by the method shown in the patent literature in which acrylates and initiators are first started with polyolefin particles and then the acrylates are polymerized at high temperatures. Thus, impregnation of the acrylate and the initiator can be achieved by adding a little water, in the absence of any moisture, by adding water when more than half of the acrylate is impregnated (these three methods are mainly Finland patents FI85496, FI86642. And FI88170) or in the presence of a total amount of water (such as US Pat. No. 4,412,938). Impregnation can also be carried out to add the acrylate and the initiator slowly at high temperature into the water suspension containing the polyolefin particles for several hours so that impregnation and polymerization can be carried out simultaneously (this method is described in German patent DE 2,907,662).

An advantageous method is the method according to Finland patent FI88170. By this method, up to about 65% by weight of acrylate can be impregnated and polymerized to the polyolefin in the polymerization step. If a very soft elastomer is to be obtained by increasing the amount of polyacrylate, the product obtained from the final polymerization step can be further impregnated with acrylate and then polymerized. By this method, the polyacrylate amount can be raised gradually to around 100%. This incremental increase in the amount of polyacrylate does not need to be carried out in a separate polymerization reaction as a whole. At the end of the initial polymerization, the temperature was lowered to the impregnation temperature. Desired amounts of acrylate and initiator can be fed there. When the acrylate and initiator are absorbed into the particles, the temperature rises and the acrylate polymerizes.

If the polymerization is carried out in two or more steps and crosslinks the polyacrylate, it is appropriate to carry out the initial polymerization without the use of diacrylates. Thus, the chains of the polyacrylate are not crosslinked, and thus there is a difference in polarity compared to the polyolefin phase, so that the polyacrylate forms a dispersed phase during the initial polymerization step. In the subsequent polymerization step, the added acrylates and diacrylates mainly go to the polyacrylate particles already present in the polyolefin matrix, where they are crosslinked. Although the added diacrylate hardly reacts with the polyacrylate formed in the first polymerization stage, the latter is the chemical formed in the second polymerization stage because the acrylate and diacrylate are polymerized in the presence of the polyacrylate already present. Polyacrylates crosslinked by means of physical crosslinking by so-called entanglements.

Physical properties of the polymerization product

Since the elastomers in these thermoplastic elastomers are polyacrylates, the product will have particularly good oil resistance, weather resistance and aging resistance. The properties of the thermoplastic elastomers produced according to the invention depend on the polyolefins used, ie the polyethylenes containing single, block or random polypropylenes, single polyethylenes or comonomers. Properties of the choice of polyolefins are in particular heat resistance, chemical resistance and adhesion. The type of acrylate, the amount of acrylate and the crosslink density affect the properties of the product, such as hardness, tensile strength and elasticity. The properties of ethylene based products are good heat and oil resistance. The properties of the product can of course be adjusted by adding fillers. The filler can also be left partially contained in the starting polyolefin. The properties of the product are described in more detail in the following experiments.

Use of the product

The material produced according to the invention can be applied in the field where other thermoplastic elastomers or conventional rubbers are used. Thus, typical applications are in the building industry, for example in sealing lists and packaging, in the automotive industry, for example in protective transmission bellows in power transmission and in interiors of appliance panels, in the electrical industry, such as cable materials, in contact devices and the like. Such materials may also be used in various structural components such as handles, wheels, and exterior materials.

The material can be processed by conventional processing methods used for thermoplastics such as extrusion, injection molding and blow molding. Since the polyolefin is a continuous phase, the material is well suited for coextrusion with polyolefins. In processing, conventional additives such as antioxidants, fillers and oils may be added.

Examples 1-16

Polyolefin pellets, initiators and possibly 1,6-hexanediol diacrylate are added to the reactor. The reactor was charged with three to seven to eight bars of nitrogen beforehand to remove oxygen. The temperature is then raised to the impregnation temperature and maintained with continuous stirring until most of the acrylate and initiator are impregnated.

This impregnation time takes 1 to 3 hours depending on the quality of the polyolefin. Then, suspended water also washed with nitrogen is added. This suspension water contains tricalcium phosphate and sodium dodecylbenzenesulfonate as a suspending agent. The temperature of the suspended water is equal to the impregnation temperature. After adding water, the initiator is decomposed and raised to the temperature at which polymerization is initiated. The polymerization reaction takes 7 to 12 hours depending on the quality of the polyolefin. After the polymerization, the polymerization product is washed and dried. In this way a number of different polyolefin-polyacrylate materials such as Table 1 are prepared.

All polypropylene based materials containing at least 50% by weight of acrylate are prepared in two steps, the product of the first step containing 50% by weight of acrylate. Example 9 was also performed in two steps, and Example 10 was performed in three steps. The structure of the dispersed polyacrylate domain is as shown in FIG. 1, where the product of the final polymerization stage of Example 15 was photographed by transmission electron microscopy. In the photograph, the dark dispersed phase is polyacrylate and the bright continuous phase is polypropylene. It can be seen from the photograph that the diameter of the polyacrylate particles is about 0.5 μm.

TABLE 1

Examples 1-16

The polymeric materials according to Table 1 were injection molded into sheets of 80 × 80 mm size and 2 mm thickness at 165 to 205 ° C., depending on the polyolefin used. The required test bar was punched out of the sheet. Table 2 shows the mechanical properties. Elongation at break and tensile strength were measured with test rods punched transverse to the flow direction of injection molding.

TABLE 2

Mechanical Properties of the Materials of Examples 1-16

The amount of polyacrylate has a great influence on the hardness of the product, and the higher the amount, the softer the product. See Examples 1 and 2 and Examples 11-15.

In mechanical properties, polyolefin quality also has a great influence on hardness. Compare 2,3,4 and 5 and 6. The amount of diacrylate affects all mechanical properties. Higher amounts improve strength, compressive strain and tensile strain, but reduce elongation at break. Compare 7 and 8 and 12 and 13.

In Table 3, the product of Example 7 was compared to commercially available SBS quality Dexcos Vektor-2411D at 55 ° C. Both had the same hardness and the same maximum operating temperature of 60 to 70 ° C. From this table, it was found that SBS had significantly lower oil resistance than the product of Example 7. In addition, in Table 3, the product of Example 13 was compared with the thermoplastic elastomer Santopren 201-80 at 100 ° C. The product of Example 13 had polypropylene in polyolefin and in the continuous phase, and also the heat resistance could be compared with santoprene having polypropylene in the continuous phase. Santoprene has ethylene-propylene-diene rubber in its elastic phase. Although both had the same hardness, it was found from the table that the product of Example 13 had much better oil resistance than santoprene in ASTM1- and ASTM2-oil tests. In the ASTM3-oil test, santoprene was slightly better.

TABLE 3

Oil resistance measured by the degree of swelling of the material produced according to the invention compared to thermoplastic elastomers marketed by ISO 1817. Example 7 and SBS were measured at 55 ° C., Example 13 and santoprene at 100 ° C.

Aging resistance of the material at high temperatures was tested by aging the material at 70 ° C. for 168 hours. Elongation at break and tensile strength were measured in an unaging and aging state from a test bar punched in the flow direction. The material of Example 7 was compared with commercial SBS-quality, Enichem Europrene SOL T166, and SEBS-quality, Neste Polymer Compounds 6503. These three materials are comparable in hardness and working temperature. From Table 4 it can be seen that the material of Example 7 shows good aging resistance at high temperatures. Apart from that fact, the material of Example 7 was not stabilized by antioxidants. In the table also compared the polypropylene base material according to Example 13 with the santoprene quality 210-80.

TABLE 4

Elongation at break and tensile strength during aging at 70 ° C. for 168 hours. The difference between unaging and aging material is shown in%.

Examples 17-20

Three different fillers were charged in an extruder at 200 ° C. so that the material produced according to Example 7 was 23-41% by weight in the final product, except that the amount of diacrylate was 0.5% by weight. From Table 5, it can be seen that the hardness increases as the filler content increases. Compared with the unfilled material of Example 17, the other mechanical properties remained unchanged.

TABLE 5

Example 17 Effect of Fillers on Mechanical Properties of Products

Examples 21, 22 and 23

To the material correctly made according to Example 13, 10% by weight of oil and 0.3% by weight of antioxidant Iganox 1520 were added in a single screw extruder at 205 ° C. Paraffin oil Nypar 40 (Nests-Alfa Oy), and naphthenic oil Nytex 840 (Nyn Petroleum) were used as oils. Thus, the composition of the final product is 10% by weight of oil, 63% by weight of polybutyl acrylate and 27% by weight of polypropylene. This material was injection molded into a sheet, and then a test bar was punched from the sheet in the flow direction. From the results in Table 6, the addition of oil made the material smooth without losing other mechanically superior properties, but the compressive and tensile strains were improved.

TABLE 6

Add 10% by weight oil to polypropylene-polyacrylate material

Examples 24 and 25

These tests were carried out in the same manner as in Example 13 except that the reactor was filled with acrylate with 6% by weight of oil in the second polymerization stage. The whole amount of oil was absorbed into the pellets and the composition ratio of the final product * was thus 6% by weight oil, 70% by weight polybutylacrylate and 24% by weight polypropylene. Compared to Example 13 from the experimental results in Table 7, the material is considerably softer and the compressive strain is somewhat better. Elongation at break and tensile strength decreased slightly.

Example 26

The experiment was carried out in the same manner as in Examples 24 and 25 except that oil was added in the two-stage polymerization stage, both 6 wt% in the first polymerization stage and 11 wt% in the second polymerization stage. As a result, the final composition ratio is 14% by weight of oil, 30% by weight of polypropylene, 56% by weight of butyl acrylate (including 2.2% by weight of diacrylate).

Oil was used Nytex 840. The test results are shown in Table 7.

Examples 27 and 28

A polypropylene-based material prepared in the same manner as in Example 13 was oiled except that the amount of butylacrylate in the first polymerization step was 37% by weight and 34% (+ 3% by weight) in the second polymerization step. It was used as a raw material for the overfill test. As a result, the final composition ratio is 40% by weight, including 60% by weight polybutyl acrylate and 3% by weight diacrylate.

TABLE 7

Effect of Oils and Fillers on Physical Properties

Claims (10)

In the thermoplastic elastomer composed of a polyolefin-polyacrylate blend having a weight ratio of polyolefin and polyacrylate in the final product of 1 to 5, Acrylates are added to the polyolefin particles by adding acrylate monomer, initiator and 2 to 15% by weight of the acrylate monomer to absorb the polyolefin particles, raising the temperature and then polymerizing the acrylate to the polyolefin to form a dispersed phase. A thermoplastic elastomer, wherein the polyacrylate is crosslinked by copolymerizing diacrylate with a rate. The thermoplastic elastomer according to claim 1, wherein the polyacrylate has a glass transition temperature of room temperature or less. The alkylacryl according to claim 1 or 2, wherein the monomer of the polyacrylate contains an alkyl acrylate having at least 1 carbon atoms in the alkyl chain, an alkyl methacrylate having 4 or more carbon atoms in the alkyl chain, or an alkylacryl containing a polar group such as an alkoxy group and a hydroxy group. Thermoplastic elastomer, characterized in that the rate and methacrylate. The thermoplastic elastomer according to claim 1 or 2, wherein the polyolefin is polypropylene, polypropylene containing comonomers, polyethylene or polyethylene containing comonomers. The thermoplastic elastomer according to claim 1 or 2, wherein 0 to 40% by weight of oil can be added during polymerization or in a separate extrusion process step to soften the material. The thermoplastic elastomer according to claim 1 or 2, wherein the final product can contain 0 to 70% by weight of filler. The thermoplastic elastomer according to claim 1 or 2, which can contain an oil and a filler at the same time. The thermoplastic elastomer according to claim 1 or 2, which can be processed by conventional processing methods such as extrusion, injection molding, blow molding and coextrusion with polyolefin. The thermoplastic elastomer according to claim 1, which has excellent oil resistance and weather resistance. The thermoplastic elastomer according to claim 1 or 2, which is used in the construction and electrical industry, as a structural part such as a handle, and in other fields where other thermoplastic elastomers and conventional rubbers are used.