WO2015146441A1 - Composition de caoutchouc antivibrations à usage automobile, éléments en caoutchouc antivibrations à usage automobile le comprenant et dispositif en caoutchouc antivibrations rempli de liquide à usage automobile - Google Patents

Composition de caoutchouc antivibrations à usage automobile, éléments en caoutchouc antivibrations à usage automobile le comprenant et dispositif en caoutchouc antivibrations rempli de liquide à usage automobile Download PDF

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WO2015146441A1
WO2015146441A1 PCT/JP2015/055428 JP2015055428W WO2015146441A1 WO 2015146441 A1 WO2015146441 A1 WO 2015146441A1 JP 2015055428 W JP2015055428 W JP 2015055428W WO 2015146441 A1 WO2015146441 A1 WO 2015146441A1
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vibration rubber
automobile
vibration
rubber composition
rubber
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PCT/JP2015/055428
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English (en)
Japanese (ja)
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雄介 西川
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住友理工株式会社
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/06—Sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L11/00—Compositions of homopolymers or copolymers of chloroprene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators

Definitions

  • the present invention relates to an anti-vibration rubber composition for automobiles, an anti-vibration rubber member for automobiles comprising the same, and a liquid-filled anti-vibration rubber apparatus for automobiles, which can be used for automobile engine mounts, suspension bushings, and the like.
  • Anti-vibration rubber members such as engine mounts and suspension bushings used as connecting members for various components such as automobile engines and frames, due to the spring characteristics and vibration damping characteristics of rubber bodies (vulcanized rubber molded bodies) It exhibits anti-vibration performance.
  • various types of anti-vibration rubber devices have been proposed in which anti-vibration performance is further improved by enclosing a liquid in these anti-vibration rubber members (see, for example, Patent Documents 1 to 3). ).
  • the liquid-filled type anti-vibration rubber device includes a chamber wall (diaphragm or the like) that deforms in response to vibration, and the chamber wall is made of a rubber body.
  • the encapsulated liquid is encapsulated.
  • a peroxide-crosslinked material is generally used in order to improve heat resistance and durability.
  • an antioxidant is used as a technique for improving ozone resistance and compression set. Is contained.
  • a peroxide-crosslinked rubber body has low flexibility and lacks durability required for an anti-vibration rubber member for automobiles.
  • peroxide crosslinking when peroxide crosslinking is used, there is a problem that compression set at normal temperature deteriorates.
  • the present invention has been made in view of such circumstances, and has an anti-vibration rubber composition for automobiles and an anti-vibration rubber for automobiles comprising the same, which is excellent in durability, compression set at normal temperature and excellent in ozone resistance. It is an object of the present invention to provide a member and a liquid filled anti-vibration rubber device for automobiles.
  • the present invention provides an anti-vibration rubber for automobiles comprising as a main component a blend polymer comprising the following components (A) to (C) and containing the following components (D) and (E):
  • the composition comprises only the component (E) as a crosslinking agent, and the ratio of the total amount of the components (B) and (C) to the blend polymer is 20 to 40% by weight, and the components (B) and (C
  • the first gist is an anti-vibration rubber composition for automobiles in which the ratio to the component is set to satisfy the relationship of (B) ⁇ (C).
  • A Natural rubber
  • E Ethylene-propylene-diene terpolymer rubber
  • EPDM Ethylene-propylene-diene terpolymer rubber
  • C Chloroprene rubber
  • D Zinc oxide.
  • E Sulfur-based vulcanizing agent.
  • the present invention also provides a vehicle vibration isolator rubber member comprising a vulcanized body of the vehicle anti-vibration rubber composition according to the first aspect, and a vehicle using the vehicle anti-vibration rubber member.
  • the third aspect is a liquid-filled vibration-proof rubber device.
  • the present inventor has intensively studied to solve the above problems.
  • the polymer of an anti-vibration rubber composition for automobiles was a blend polymer of natural rubber (NR) and ethylene-propylene-diene terpolymer rubber (EPDM).
  • NR natural rubber
  • EPDM ethylene-propylene-diene terpolymer rubber
  • peroxide polymer crosslinking is often performed with blend polymers of NR and EPDM, but as described above, the present inventors have studied sulfur vulcanization because of its poor flexibility in terms of the crosslinking structure. .
  • sulfur vulcanization even in the case of sulfur vulcanization, the EPDM side with few crosslinking points is in an unvulcanized state, and the compression set has not been sufficiently improved.
  • CR chloroprene rubber
  • the present inventor has added an appropriate amount of chloroprene rubber (CR) to the blend polymer described above, and further added zinc oxide, thereby improving the compression set without deteriorating the durability. It was found that the effect of improving ozone resistance was remarkably obtained.
  • CR has good ozone resistance and can obtain a crosslinked structure with good compression set by reaction with zinc oxide. If too much CR is added, the CR ratio having a zinc oxide cross-linked structure increases and the durability deteriorates.
  • the ratio of the total amount of EPDM and CR to the blend polymer should be 20 to 40% by weight.
  • by adding an appropriate amount so that the CR ratio is equal to or less than the EPDM ratio such a problem can be solved. Thus, it has been found that the intended purpose can be achieved, and the present invention has been achieved.
  • the anti-vibration rubber composition for automobiles of the present invention mainly comprises a blend polymer comprising natural rubber (NR), ethylene-propylene-diene terpolymer rubber (EPDM), and chloroprene rubber (CR).
  • An anti-vibration rubber composition containing, as components, zinc oxide and a sulfur-based vulcanizing agent, wherein only the sulfur-based vulcanizing agent is a crosslinking agent, and the ratio of the total amount of EPDM and CR to the blend polymer is 20
  • the ratio of CR is set to be equal to or less than the ratio of EPDM. Therefore, it has excellent durability and compression set at normal temperature, and also has an effect of excellent ozone resistance.
  • the anti-vibration rubber composition for automobiles of the present invention is used for an anti-vibration rubber member (diaphragm, etc.) in a liquid-filled anti-vibration rubber apparatus for automobiles such as engine mounts, transmission mounts, suspension bushings, and motor mounts used in automobiles. It can be used satisfactorily as a material for a vibration-proof rubber member for automobiles that require durability, compression set characteristics and ozone resistance, such as suspension boots (bellow boots).
  • the anti-vibration rubber composition for automobiles of the present invention includes natural rubber (NR) (component A) and ethylene-propylene-diene Mainly blend polymer consisting of original copolymer rubber (EPDM) (component B) and chloroprene rubber (CR) (component C), containing zinc oxide (component D) and sulfur vulcanizing agent (component E)
  • the anti-vibration rubber composition comprises only the sulfur-based vulcanizing agent as a crosslinking agent, and the ratio of the total amount of EPDM and CR to the blend polymer is 20 to 40% by weight, and the component (B) and ( The ratio with the component C) is set so as to satisfy the relationship of (B) ⁇ (C).
  • the above “main component” means a material that greatly affects the properties of the composition, and usually means 55% by weight or more of the whole.
  • “only the sulfur vulcanizing agent is used as a crosslinking agent” means that the vibration-insulating rubber composition of the present invention is not a peroxide crosslinking system.
  • the EPDM (component B) used in the vibration-proof rubber composition preferably has a diene content of 3 to 11% by weight from the viewpoint of ozone resistance and the like.
  • the ratio of the chloroprene rubber (component C) to the blend polymer comprising the components (A) to (C) is preferably 1 to 10% by weight, more preferably 3 to 7% by weight. . That is, if the blending amount of chloroprene rubber is too small, the effect of improving compression set and ozone resistance required for the present invention cannot be obtained, and conversely, if the blending amount of chloroprene rubber is too large, durability is improved. Because it gets worse.
  • the blending amount of zinc oxide (component D) with respect to 100 parts by weight (hereinafter abbreviated as “part”) of the blend polymer comprising the components (A) to (C) is a compression permanent that is improved by reaction with CR. From the viewpoint of distortion, the content is preferably 2 to 20 parts.
  • the blending amount of the sulfur-based vulcanizing agent (component E) with respect to 100 parts of the blend polymer comprising the components (A) to (C) is preferably 0.2 to 5 parts, more preferably 0.8. It is in the range of 5 to 2 parts. That is, if the blending amount of the vulcanizing agent is too small, a sufficient cross-linking structure cannot be obtained, and dynamic tendency and compression set at normal temperature tend to deteriorate. Conversely, the blending amount of the vulcanizing agent is low. This is because if the amount is too large, the heat resistance tends to decrease.
  • sulfur vulcanizing agent (component E) examples include sulfur such as sulfur and sulfur chloride (powder sulfur, precipitated sulfur, insoluble sulfur), 2-mercaptoimidazoline, dipentamethylene thiuram pentasulfide, and the like. It is done. These may be used alone or in combination of two or more.
  • the anti-vibration rubber composition of the present invention comprises the above components (A) to (E) as essential components. If necessary, in addition to the above components, carbon black, vulcanization accelerator, anti-aging An agent, a process oil, a processing aid, a white filler, a reactive monomer, a foaming agent and the like may be appropriately blended as necessary.
  • vulcanization accelerator examples include vulcanization accelerators such as thiazole, sulfenamide, thiuram, aldehyde ammonia, aldehyde amine, guanidine, and thiourea. These may be used alone or in combination of two or more.
  • the blending amount of the vulcanization accelerator is preferably in the range of 0.2 to 5 parts with respect to 100 parts of the blend polymer comprising the components (A) to (C).
  • thiazole vulcanization accelerator examples include dibenzothiazyl disulfide (MBTS), 2-mercaptobenzothiazole (MBT), 2-mercaptobenzothiazole sodium salt (NaMBT), and 2-mercaptobenzothiazole zinc salt ( ZnMBT) and the like. These may be used alone or in combination of two or more. Among these, dibenzothiazyl disulfide (MBTS) and 2-mercaptobenzothiazole (MBT) are preferably used because they are particularly excellent in crosslinking reactivity.
  • sulfenamide vulcanization accelerator examples include N-oxydiethylene-2-benzothiazolylsulfenamide (NOBS), N-cyclohexyl-2-benzothiazolylsulfenamide (CBS), N -T-butyl-2-benzothiazoylsulfenamide (BBS), N, N'-dicyclohexyl-2-benzothiazoylsulfenamide and the like.
  • thiuram vulcanization accelerator examples include tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), tetrabutylthiuram disulfide (TBTD), tetrakis (2-ethylhexyl) thiuram disulfide (TOT), tetra Examples thereof include benzyl thiuram disulfide (TBzTD).
  • anti-aging agent examples include carbamate-based anti-aging agents, phenylenediamine-based anti-aging agents, phenol-based anti-aging agents, diphenylamine-based anti-aging agents, quinoline-based anti-aging agents, imidazole-based anti-aging agents, and waxes. can give. These may be used alone or in combination of two or more.
  • the blending amount of the anti-aging agent is preferably in the range of 0.5 to 10 parts, particularly preferably in the range of 2 to 10 parts with respect to 100 parts of the blend polymer comprising the components (A) to (C). It is. That is, by blending the anti-aging agent at such a ratio, the effect of improving the durability reduction associated with the elution of the anti-aging agent into the encapsulating liquid is improved.
  • process oil examples include naphthenic oil, paraffinic oil, and aroma oil. These may be used alone or in combination of two or more.
  • the blending amount of the process oil is preferably in the range of 2 to 30 parts with respect to 100 parts of the blend polymer comprising the components (A) to (C).
  • the anti-vibration rubber composition of the present invention contains the components (A) to (E), which are essential materials, in a specific ratio, and, if necessary, other components listed above. These can be prepared by kneading using a kneader such as a kneader, a Banbury mixer, an open roll, or a twin screw type stirrer.
  • a kneader such as a kneader, a Banbury mixer, an open roll, or a twin screw type stirrer.
  • This rubber composition becomes a vulcanized body by heating, and becomes a vibration-proof rubber member for automobiles.
  • This vulcanizate is excellent in durability, compression set at room temperature and excellent in ozone resistance even if the content of the anti-aging agent is suppressed (without relying on the anti-aging agent).
  • an anti-vibration rubber member (diaphragm or the like) in an automotive liquid-filled anti-vibration rubber device such as an engine mount, a mission mount, a suspension bush, or a motor mount used in an automobile.
  • an automotive liquid-filled anti-vibration rubber device such as an engine mount, a mission mount, a suspension bush, or a motor mount used in an automobile.
  • the anti-vibration rubber composition of the present invention can also be used favorably as a material for the anti-vibration rubber member.
  • the liquid-filled vibration isolating rubber device for automobiles of the present invention has high ozone resistance and compression set even if the content of the anti-aging agent in the vibration isolating rubber member is suppressed. With the suppression of the use of the agent, it is excellent in durability improvement (improvement in durability decrease due to elution of anti-aging agent in the encapsulated liquid).
  • EDM-1 Esprene 505 (diene content: 10.0% by weight) manufactured by Sumitomo Chemical Co., Ltd.
  • EPDM-3 Made by Sumitomo Chemical Co., Ltd., Esprene 7456 (diene content: 10.5% by weight, oil extended amount: 20 parts)
  • Example 1 NR 70.0 parts, EPDM-1 25.0 parts, CR 5.0 parts, zinc oxide 5.0 parts, stearic acid 2.0 parts, anti-aging agent 2.0 parts, wax 2. 0 parts, 35.0 parts of carbon black, and 10.0 parts of naphthenic oil are blended, and these are kneaded for 3 minutes or more using a Banbury mixer, and discharged when the rubber temperature reaches 140 ° C. did. Next, 0.8 parts of vulcanization accelerator TMTD, 1.2 parts of vulcanization accelerator CBS, and 0.5 parts of sulfur are blended in this, and kneaded at 60 ° C. for 5 minutes using an open roll. Thus, an anti-vibration rubber composition was prepared.
  • Examples 2 to 7, Comparative Examples 1 to 7 As shown in Tables 1 and 2 below, an anti-vibration rubber composition was prepared according to Example 1 except that the amount of each component was changed.
  • each characteristic was evaluated according to the following criteria. The results are also shown in Tables 1 and 2 below.
  • evaluation of each characteristic made the measured value in the anti-vibration rubber composition of the comparative example 1 100, and with respect to this value, the measured value in the anti-vibration rubber composition of each example and the comparative example was converted into an index. is there.
  • the results that were not inferior to the anti-vibration rubber composition of Comparative Example 1 were evaluated as “ ⁇ ” in the comprehensive evaluation, and those in which even one result was inferior, In the evaluation, “x” was evaluated.
  • compression set Using each anti-vibration rubber composition, press vulcanization at 160 ° C. for 30 minutes was performed to prepare a cylindrical test piece having a diameter of 29 mm and a thickness of 12.5 mm. And according to JIS K 6262, each test temperature and time [(i) 25 ° C. ⁇ 24 hours, (ii) 100 ° C. ⁇ 72 hours, (iii) 100 ° C. ⁇ with the test piece compressed by 25% 504 hours], compression set (%) was measured.
  • the anti-vibration rubber compositions of the examples are not inferior in the evaluation of ozone resistance, compression set, and durability as compared to the anti-vibration rubber composition of Comparative Example 1 containing no CR, and It can be seen that characteristics superior to those of the anti-vibration rubber composition of Comparative Example 1 are obtained.
  • the anti-vibration rubber compositions of Comparative Examples 2 and 3 do not contain CR like the anti-vibration rubber composition of Comparative Example 1, and are different from those of Comparative Example 1 and EPDM.
  • the compression set was improved, the ozone resistance evaluation was inferior to that of Comparative Example 1.
  • the anti-vibration rubber composition of Comparative Example 4 contained CR, the ratio of the total amount of EPDM and CR was too small, and sufficient ozone resistance evaluation could not be obtained.
  • the anti-vibration rubber composition of Comparative Example 5 had too much proportion of the total amount of EPDM and CR, resulting in poor durability evaluation.
  • the anti-vibration rubber composition of Comparative Example 6 had more CR than EPDM, resulting in inferior ozone resistance and durability evaluation.
  • the anti-vibration rubber composition of Comparative Example 7 was peroxide-crosslinked, resulting in inferior initial compression set (compression set under condition (i)) and durability evaluation.
  • the anti-vibration rubber composition of the present invention is used for automobiles because it has excellent durability and compression set at normal temperature and has excellent ozone resistance even if the content of the anti-aging agent is suppressed. It can be used favorably as a material for a vibration isolating rubber member (diaphragm or the like) in a liquid filled anti-vibration rubber device for automobiles such as an engine mount, a mission mount, a suspension bush, and a motor mount. In addition, non-liquid-filled types of engine mounts, mission mounts, suspension bushings, motor mounts, etc., and suspension boots (bellows boots), etc. for automobiles that require durability, compression set characteristics and ozone resistance. The anti-vibration rubber composition of the present invention can also be used favorably as a material for the anti-vibration rubber member.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

La présente invention concerne une composition de caoutchouc antivibrations à usage automobile possédant un polymère de mélange présentant comme composant primaire les composants allant de (A) à (C) comme présenté ci-dessous et contenant les composants (D) et (E) comme présenté ci-dessous, seul le composant (E) étant un agent de réticulation, le rapport de la quantité totale des composants (B) et (C) par rapport au polymère de mélange étant de 20 à 40 % en poids, et les proportions en composant (B) et en composant (C) étant réglés de façon à satisfaire la relation (B) ≥ (C). Par conséquent, la présente invention est capable de fournir : une composition de caoutchouc antivibrations à usage automobile présentant une durabilité exceptionnelle, une excellente déformation de compression permanente à température ambiante et une remarquable résistance à l'ozone ; un élément en caoutchouc antivibrations à usage automobile comprenant cette composition de caoutchouc antivibrations et un dispositif en caoutchouc anti-vibration rempli de liquide à usage automobile dans lequel est utilisé cet élément en caoutchouc antivibrations. (A) Caoutchouc naturel (NR). (B) Caoutchouc de terpolymère d'éthylène-propylène-diène (EPDM). (C) Caoutchouc de chloroprène (CR). (D) Oxyde de zinc. (E) Agent de vulcanisation à base de soufre.
PCT/JP2015/055428 2014-03-24 2015-02-25 Composition de caoutchouc antivibrations à usage automobile, éléments en caoutchouc antivibrations à usage automobile le comprenant et dispositif en caoutchouc antivibrations rempli de liquide à usage automobile WO2015146441A1 (fr)

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JP2014060034 2014-03-24
JP2014-060034 2014-03-24
JP2015-035234 2015-02-25
JP2015035234A JP2015193798A (ja) 2014-03-24 2015-02-25 自動車用防振ゴム組成物およびそれからなる自動車用防振ゴム部材、並びに自動車用液体封入式防振ゴム装置

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CN105273266A (zh) * 2015-11-24 2016-01-27 苏州市相城区明达复合材料厂 一种发泡减震材料
CN106279801A (zh) * 2016-08-16 2017-01-04 浙江久运车辆部件有限公司 一种横向稳定杆支架橡胶衬套
JP2021513595A (ja) * 2018-02-14 2021-05-27 ダウ グローバル テクノロジーズ エルエルシー 継続的高温耐性を向上させたエチレン／アルファオレフィンインターポリマー組成物

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JP2008280528A (ja) * 2007-04-09 2008-11-20 Bridgestone Corp 液封入防振ゴム用ゴム組成物
JP2009024046A (ja) * 2007-07-17 2009-02-05 Bridgestone Corp 防振ゴム組成物及びそれを用いてなる防振ゴム
JP2013155333A (ja) * 2012-01-31 2013-08-15 Bridgestone Corp 防振ゴム組成物及び防振ゴム

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JP2001240703A (ja) * 2000-02-25 2001-09-04 Jsr Corp ゴム組成物及びそれを用いた防振ゴム
JP2006193621A (ja) * 2005-01-13 2006-07-27 Toyo Tire & Rubber Co Ltd 防振ゴム組成物及び防振ゴム
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105273266A (zh) * 2015-11-24 2016-01-27 苏州市相城区明达复合材料厂 一种发泡减震材料
CN106279801A (zh) * 2016-08-16 2017-01-04 浙江久运车辆部件有限公司 一种横向稳定杆支架橡胶衬套
JP2021513595A (ja) * 2018-02-14 2021-05-27 ダウ グローバル テクノロジーズ エルエルシー 継続的高温耐性を向上させたエチレン／アルファオレフィンインターポリマー組成物
JP7446229B2 (ja) 2018-02-14 2024-03-08 ダウ グローバル テクノロジーズ エルエルシー 継続的高温耐性を向上させたエチレン／アルファオレフィンインターポリマー組成物

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