JP5800563B2 - Damping damper material and damping damper - Google Patents

Description

  The present invention relates to a damping damper material and a damping damper, and more particularly, to a damping damper material and a damping damper for absorbing shocking variation and vibration of a skeleton structure forming material in the building field.

  In the building field, vibration dampers are being developed to absorb vibrations caused by earthquakes, typhoons, etc., and to give buildings very high vibration damping structures. For damping materials used for damping dampers with stable vibration damping, high damping is required in order to exhibit shock absorbing displacement and vibration absorbing action of skeleton structure forming materials such as columns. Is done.

  For example, International Publication No. 01/074964 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2002-161209 (Patent Document 2) include a polymer block containing isobutylene as a main component and an aromatic vinyl compound as a main component. A damping material composition comprising a block copolymer consisting of a polymer block and a damping damper using the composition are described, and these damping material compositions have high vibration damping near room temperature. One purpose is to realize sexuality.

  In the example of Patent Document 1, the loss tangent (tan δ) at 0 to 40 ° C. obtained by measuring the dynamic viscoelasticity (frequency: 0.1 to 5 Hz) of the damping material composition is 0.52 to 0.52. Although it is about 1.22, it is described in Patent Document 2 that 0.7 or more is most preferable as the value of tan δ at 10 to 30 ° C. obtained similarly by performing dynamic viscoelasticity measurement. The value of tan δ in the examples is unknown.

  Moreover, although it is not a material for vibration dampers, for example, in Japanese Patent Application Laid-Open No. 2005-336460 (Patent Document 3), a vibration isolating member made of a thermoplastic elastomer composition containing a specific styrenic block copolymer. JP-A-2000-198974 (Patent Document 4), JP-A-2006-206628 (Patent Document 5) and the like also disclose a vibration damping material or a vibration-proof material made of a thermoplastic elastomer composition. JP 2003-64227 A (Patent Document 6) discloses an EPDM composition comprising an oil-extended EPDM, an ethylene / α-olefin copolymer, and an ester plasticizer as a vibration-proof material.

  Furthermore, WO 2005/121192 pamphlet (Patent Document 7) discloses a 4-methyl-1-pentene copolymer and a composition containing the same, and uses damping materials as its uses. Yes.

International Publication No. 01/074964 Pamphlet JP 2002-161209 A JP 2005-336460 A JP 2000-198974 A JP 2006-206628 A JP 2003-64227 A International Publication No. 2005/121192 Pamphlet

  However, the damping material composition and damping damper described in Patent Documents 1 and 2 use an aromatic vinyl compound as a monomer, so that odors and low molecular weight substances are precipitated, and also with asphalt. Since it became a composition, it became high density, and the subject remained in the point of lightweight.

  The vibration-damping material made of a styrene-based thermoplastic elastomer composition (Patent Document 3) has a problem of high density and light weight and vibration-proofing properties. The vibration-damping material made of the thermoplastic elastomer composition of Patent Documents 4 and 5 Alternatively, the vibration isolator also has problems in terms of chemical resistance and hydrolysis resistance of the polyester and polyamide portions which are part of the composition.

  Further, the vibration-proof material made of an EPDM composition (Patent Document 6) is flexible, but has a sufficient tan δ value at room temperature of around 0.3 and insufficient vibration damping. In addition, since it contains an ester plasticizer, there is a problem of chemical resistance and hydrolysis resistance.

  The present invention aims to solve the problems in the prior art as described above. Specifically, it has excellent vibration damping properties near room temperature, is lightweight, and has chemical resistance and hydrolysis resistance. An object of the present invention is to provide a vibration damper material for producing a vibration damper having excellent characteristics, and a vibration damper having such characteristics.

The material for a vibration damper according to the present invention is characterized by containing at least a 4-methyl-1-pentene / propylene copolymer (A) satisfying the following requirements (a) and (b):
(A) a structural unit (i) derived from 15 to 75 mol% of 4-methyl-1-pentene and a structural unit (ii) derived from 25 to 85 mol% of propylene (provided that the structural unit (i) The sum of the proportion and the proportion of the structural unit (ii) is 100 mol%).
(B) The density is in the range of 830 to 860 kg / m ³ .

  The vibration damper material contains the 4-methyl-1-pentene / propylene copolymer (A) and a thermoplastic resin (excluding the copolymer (A)) or rubber (B1). It may be a resin composition.

  The vibration damper of the present invention is characterized by comprising at least a part of the material for a vibration damper of the present invention.

ADVANTAGE OF THE INVENTION According to this invention, the vibration damper material which is excellent in the damping property and light weight property near room temperature, and such a characteristic are provided.
Moreover, since the material for vibration dampers and the vibration damper of the present invention contain the 4-methyl-1-pentene / propylene copolymer (A) which is a polyolefin, it is excellent in chemical resistance and hydrolysis resistance. Yes.

Hereinafter, the material for a vibration damper and the vibration damper according to the present invention will be described in more detail.
[Material for damping damper]
The material for vibration dampers of the present invention is characterized by containing at least a 4-methyl-1-pentene / propylene copolymer (A) having specific physical properties.

<4-Methyl-1-pentene / propylene copolymer (A)>
The 4-methyl-1-pentene / propylene copolymer (A) satisfies the following requirements (a) and (b).

Requirement (a);
The 4-methyl-1-pentene / propylene copolymer (A) is derived from a structural unit (i) derived from 15 to 75 mol% of 4-methyl-1-pentene and 25 to 85 mol% of propylene. The structural unit (ii) is included (however, the sum of the proportion of the structural unit (i) and the proportion of the structural unit (ii) is 100 mol%).

  The proportion of the structural unit (i) derived from 4-methyl-1-pentene is preferably 20 to 75 mol%, more preferably 20 to 65 mol%, still more preferably 20 to 33 mol%. Particularly preferred is 20 to 32 mol%.

  Further, the proportion of the structural unit (ii) derived from propylene is preferably 25 to 80 mol%, more preferably 35 to 80 mol%, still more preferably 67 to 80 mol%, and particularly preferably. 68 to 80 mol%.

  When the proportion of the structural unit (i) is less than 15 mol%, the vibration damping performance and light weight of the vibration damping damper are impaired. When the proportion is more than 72 mol%, the vibration damping performance of the vibration damping damper is impaired. Is damaged.

  The 4-methyl-1-pentene / propylene copolymer (A) is a structural unit derived from another monomer as long as it is a small amount (for example, 10 mol% or less) that does not impair the object of the present invention. May be included. Specific examples of other monomers include ethylene, 1-butene, 1-hexene, 1-octene, 5-methyl-2-norbornene, tetracyclododecene, 5-vinyl-2-norbornene, 5-ethylidene-2- Norbornene and the like are preferable.

Requirement (b);
The density (measured by ASTM D 1505) of the 4-methyl-1-pentene / propylene copolymer (A) is in the range of 860 to 830 kg / m ³ . The details of the measurement conditions and the like are as described in the column of Examples described later.

The density is preferably 855 to 830 kg / m ³ .
The density can be changed depending on the comonomer composition ratio of the 4-methyl-1-pentene / propylene copolymer (A), and the copolymer (A) has a density within the above range. This is advantageous in manufacturing the damper.
Furthermore, the 4-methyl-1-pentene / propylene copolymer (A) preferably satisfies the following requirements (c) and (d).

Requirement (c);
Measurement of dynamic viscoelasticity of the 4-methyl-1-pentene / propylene copolymer (A) at a temperature of −40 ° C. to 150 ° C. and a frequency of 10 rad / s (details of measurement conditions and the like will be described later). The maximum value of the loss tangent tan δ (hereinafter also referred to as “tan δ peak value”) obtained by performing the above is preferably 1.0 to 10.0, more preferably 1. 0.5 to 5.0, and more preferably 2.0 to 4.0.

  The 4-methyl-1-pentene / propylene copolymer (A) was measured for dynamic viscoelasticity at a frequency of 10 rad / s in the temperature range of −40 ° C. to 150 ° C. (details of measurement conditions and the like will be described later). The temperature at which the value of the loss tangent tan δ obtained by the above (hereinafter also referred to as “tan δ peak temperature”) is preferably −10 ° C. to 40 ° C. More preferably, it is in the range of 0 ° C to 40 ° C, more preferably 5 ° C to 40 ° C.

Requirement (d);
Measurement of dynamic viscoelasticity of the 4-methyl-1-pentene / propylene copolymer (A) at a frequency of 10 rad / s at 20 ° C. (Details of measurement conditions and the like are as described in the Examples section described later) The value of the loss tangent tan δ obtained by this is preferably in the range of 0.5 to 5.0, more preferably 0.5 to 4.0, and still more preferably 0.5 to 3.5. .

The maximum value of tan δ can be controlled by the comonomer composition of the 4-methyl-1-pentene / propylene copolymer (A), for example, the content of 4-methyl-1-pentene in the copolymer (A) is By setting the content to 20 to 75 mol%, the requirements (c) and (d) can be satisfied.
When the 4-methyl-1-pentene / propylene copolymer (A) satisfies the requirements (c) and (d), the vibration damper material is excellent in vibration damping properties.

Other characteristics of copolymer (A);
The intrinsic viscosity [η] of the 4-methyl-1-pentene / propylene copolymer (A) in decalin at 135 ° C. is preferably 0.01 to 5.0 (dL / g), more preferably It is 0.05 to 4.0 (dL / g), more preferably 0.1 to 4.0 (dL / g), and particularly preferably 0.5 to 3.5 (dL / g). As described later, when hydrogen is used together during polymerization, the molecular weight can be controlled, and the intrinsic viscosity [η] can be adjusted by freely obtaining from a low molecular weight body to a high molecular weight body.

  The weight average molecular weight (Mw) of the 4-methyl-1-pentene / propylene copolymer (A) measured by gel permeation chromatography (GPC) is preferably 500 to 10,000 in terms of polystyrene. 1,000, more preferably 1,000 to 5,000,000, and still more preferably 1,000 to 2,500,000.

  The ratio (molecular weight distribution) of the weight average molecular weight (Mw) and the number average molecular weight (Mn) measured by gel permeation chromatography (GPC) of the 4-methyl-1-pentene / propylene copolymer (A). Mw / Mn) is preferably 1.0 to 3.5, more preferably 1.2 to 3.0, and still more preferably 1.5 to 2.5.

  The copolymer (A) having a value of Mw / Mn within the above range is advantageous for producing a vibration damper having excellent mechanical properties and wear resistance with excellent moldability, and is industrially useful. Higher value. When the catalyst described later is used, the copolymer (A) having a value of Mw / Mn within the above range within the range of the intrinsic viscosity [η] or the weight average molecular weight (Mw) described above can be obtained. it can. The values of Mw / Mn and Mw are values measured by the method employed in the examples described later.

  The amount of 4-methyl-1-pentene / propylene copolymer (A) extracted with methyl acetate is preferably 0 to 1.5% by weight, more preferably 0 to 1.0% by weight, and still more preferably 0. It is -0.8 weight%, Most preferably, it is 0-0.5 weight%. The amount of methyl acetate extracted becomes an index of stickiness during molding. When this value is large, the obtained polymer has a large composition distribution and contains a low molecular weight polymer, causing problems during molding. When the methyl acetate extraction amount is within the above range, there is no problem due to stickiness during molding. Further, by using a catalyst described later, a copolymer (A) with a low stereoregularity and a small atactic component can be synthesized, and by molding a material for a vibration damper comprising at least the obtained copolymer (A) A damping damper without stickiness can be obtained.

  The melting point [Tm] of the 4-methyl-1-pentene / propylene copolymer (A) measured by a differential scanning calorimeter (DSC) is preferably less than 110 ° C. or not recognized. The melting point can be changed according to the comonomer composition ratio of the copolymer (A), and the copolymer (A) having a melting point within the above range is advantageous in producing a flexible vibration damper.

The rebound resilience at 40 ° C. defined by the following formula of the 4-methyl-1-pentene / propylene copolymer (A) is preferably 0 to 25%, more preferably 0 to 20%, still more preferably. It is in the range of 0 to 15%.
Rebound resilience (%) = L (mm) / 460 × 100
[L is dropped from a height of 460 mm at 23 ° C. on a 6 mm thick press sheet prepared from the 4-methyl-1-pentene / propylene copolymer (A) according to JIS K6400. The bounce height of the 16.310 g of hard spheres. ]

  The rebound resilience can be controlled by the comonomer composition of the 4-methyl-1-pentene / propylene copolymer (A), for example, by setting the 4-methyl-1-pentene content to 20 to 72 mol%. The rebound resilience can be within the above range.

The 4-methyl-1-pentene / propylene copolymer (A) has a Shore A hardness (measured in the state of a press sheet having a thickness of 3 mm according to JIS K6253) after 15 seconds from the start of contact with the needle. Preferably, it is 5-90, More preferably, it is 10-80, More preferably, it is 15-70, Most preferably, it is 15-65. The details of the method for producing the press sheet and the like are as described in the Examples section described later.

  The value of Shore A hardness can be controlled by the comonomer composition of the copolymer (A). For example, the 4-methyl-1-pentene content in the copolymer (A) is 20 to 75 mol%. Thus, a copolymer (A) having these values in the above range can be obtained.

<Manufacturing method>
Next, a method for producing 4-methyl-1-pentene / propylene copolymer (A) will be described.

  For the production of the 4-methyl-1-pentene / propylene copolymer (A), a conventionally known catalyst such as a magnesium-supported titanium catalyst, WO 01/53369, WO 01/27124, etc. The metallocene catalyst described in JP-A-3-193966 or JP-A-02-41303 is preferably used, and more preferably a metallocene compound represented by the following general formula (1) or (2): The contained olefin polymerization catalyst is preferably used.

（式中、Ｒ¹、Ｒ²、Ｒ³、Ｒ⁴、Ｒ⁵、Ｒ⁶、Ｒ⁷、Ｒ⁸、Ｒ⁹、Ｒ¹⁰、Ｒ¹¹、Ｒ¹²、Ｒ¹³およびＲ¹⁴は、水素、炭化水素基およびケイ素含有炭化水素基から選ばれ、それぞれ同一でも異なっていてもよく、Ｒ¹からＲ⁴までの隣接した置換基は互いに結合して環を形成してもよく、Ｒ⁵からＲ¹²までの隣接した置換基は互いに結合して環を形成してもよく、Ａは一部不飽和結合および／または芳香族環を含んでいてもよい炭素原子数２〜２０の２価の炭化水素基であり、ＡはＹと共に形成する環を含めて２つ以上の環構造を含んでいてもよく、
Ｍは周期表第４族から選ばれた金属であり、
Ｙは炭素またはケイ素であり、
Ｑはハロゲン、炭化水素基、およびアニオン配位子または孤立電子対で配位可能な中性配位子から同一のまたは異なる組合せで選ばれ、
ｊは１〜４の整数である。）

(Wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ , R ¹² , R ¹³ and R ¹⁴ are hydrogen, carbonized, Selected from a hydrogen group and a silicon-containing hydrocarbon group, which may be the same or different, and adjacent substituents from R ¹ to R ⁴ may be bonded to each other to form a ring; R ⁵ to R ¹² Up to adjacent substituents may be bonded to each other to form a ring, and A is a divalent hydrocarbon having 2 to 20 carbon atoms which may partially contain an unsaturated bond and / or an aromatic ring And A may contain two or more ring structures including the ring formed with Y,
M is a metal selected from Group 4 of the periodic table,
Y is carbon or silicon;
Q is selected from the same or different combinations from halogen, hydrocarbon groups, and anionic ligands or neutral ligands capable of coordinating with lone pairs;
j is an integer of 1-4. )

R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ , R ¹² , R ^{13 in the} general formula (1) or (2) R ¹⁴ is selected from hydrogen, a hydrocarbon group and a silicon-containing hydrocarbon group, and may be the same or different.

  The hydrocarbon group is preferably an alkyl group having 1 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an alkylaryl group having 7 to 20 carbon atoms. Yes, it may contain one or more ring structures. Moreover, a part or all of hydrogen of the hydrocarbon group may be substituted with a functional group such as a hydroxyl group, an amino group, a halogen group, or a fluorine-containing hydrocarbon group. Specific examples of the hydrocarbon group include methyl, ethyl, n-propyl, isopropyl, 2-methylpropyl, 1,1-dimethylpropyl, 2,2-dimethylpropyl, 1,1-diethylpropyl, and 1-ethyl-1. -Methylpropyl, 1,1,2,2-tetramethylpropyl, sec-butyl, tert-butyl, 1,1-dimethylbutyl, 1,1,3-trimethylbutyl, neopentyl, cyclohexylmethyl, cyclohexyl, 1-methyl -1-cyclohexyl, 1-adamantyl, 2-adamantyl, 2-methyl-2-adamantyl, menthyl, norbornyl, benzyl, 2-phenylethyl, 1-tetrahydronaphthyl, 1-methyl-1-tetrahydronaphthyl, phenyl, biphenyl, Naphthyl, tolyl, chlorophenyl, chlorobipheny , Chloronaphthyl, and the like.

  The silicon-containing hydrocarbon group is preferably an alkylsilyl group or arylsilyl group having 1 to 4 silicon atoms and 3 to 20 carbon atoms, and specific examples thereof include trimethylsilyl, tert-butyldimethylsilyl, triphenylsilyl and the like. Is mentioned.

Adjacent substituents from R ⁵ to R ¹² on the fluorene ring may be bonded to each other to form a ring. Examples of such a substituted fluorenyl group include benzofluorenyl, dibenzofluorenyl, octahydrodibenzofluorenyl, octamethyloctahydrodibenzofluorenyl and the like.

The substituents R ⁵ to R ¹² on the fluorene ring are symmetrical from the viewpoint of synthesis, that is, R ⁵ = R ¹² , R ⁶ = R ¹¹ , R ⁷ = R ¹⁰ , and R ⁸ = R ^9. And the fluorene ring is more preferably unsubstituted fluorene, 3,6-disubstituted fluorene, 2,7-disubstituted fluorene or 2,3,6,7-tetrasubstituted fluorene. Wherein the 3-position on the fluorene ring, 6-position, 2-position, 7-position corresponds to the ^{R 7, R 10, R 6} , R 11 , respectively.

R ¹³ and R ^{14 in} the general formula (1) are selected from hydrogen and a hydrocarbon group, and may be the same or different. Specific examples of preferred hydrocarbon groups include the same as those described above.

Y is carbon or silicon. In the case of the general formula (1), R ¹³ and R ¹⁴ are bonded to Y to form a substituted methylene group or a substituted silylene group as a bridging part. Preferred examples include methylene, dimethylmethylene, diisopropylmethylene, methyl tert-butylmethylene, dicyclohexylmethylene, methylcyclohexylmethylene, methylphenylmethylene, fluoromethylphenylmethylene, chloromethylphenylmethylene, diphenylmethylene, dichlorophenylmethylene, difluorophenylmethylene. Methylnaphthylmethylene, dibiphenylmethylene, di-p-methylphenylmethylene, methyl-p-methylphenylmethylene, ethyl-p-methylphenylmethylene, dinaphthylmethylene or dimethylsilylene, diisopropylsilylene, methyl-tert-butylsilylene, dicyclohexyl Silylene, methylcyclohexylsilylene, methylphenylsilylene, fluoromethyl Enirushiriren, chloromethyl silylene, diphenyl silylene, mention may be made of di-p- methylphenyl silylene, methyl -p- methylphenyl silylene, ethyl -p- methylphenyl silylene, methyl naphthyl silylene, a dinaphthyl silylene like.

  In the case of the general formula (2), Y is bonded to a divalent hydrocarbon group A having 2 to 20 carbon atoms which may partially contain an unsaturated bond and / or an aromatic ring, and a cycloalkylidene group or It constitutes a cyclomethylenesilylene group and the like. Preferred examples include cyclopropylidene, cyclobutylidene, cyclopentylidene, cyclohexylidene, cycloheptylidene, bicyclo [3.3.1] nonylidene, norbornylidene, adamantylidene, tetrahydronaphthylidene, dihydroindanidene. Examples include lidene, cyclodimethylenesilylene, cyclotrimethylenesilylene, cyclotetramethylenesilylene, cyclopentamethylenesilylene, cyclohexamethylenesilylene, cycloheptamethylenesilylene, and the like.

M in the general formulas (1) and (2) is a metal selected from Group 4 of the periodic table, and examples of M include titanium, zirconium, and hafnium.
Q is selected from the same or different combinations from halogen, a hydrocarbon group having 1 to 20 carbon atoms, and an anionic ligand or a neutral ligand capable of coordinating with a lone electron pair. Specific examples of the halogen include fluorine, chlorine, bromine and iodine, and specific examples of the hydrocarbon group include the same as those described above. Specific examples of the anionic ligand include alkoxy groups such as methoxy, tert-butoxy and phenoxy, carboxylate groups such as acetate and benzoate, and sulfonate groups such as mesylate and tosylate. Specific examples of neutral ligands that can be coordinated by a lone pair include organophosphorus compounds such as trimethylphosphine, triethylphosphine, triphenylphosphine, diphenylmethylphosphine, and tetrahydrofuran, diethyl ether, dioxane, 1,2- And ethers such as dimethoxyethane. Among these, Q may be the same or different combinations, but at least one is preferably a halogen or an alkyl group.

  Specific examples of the metallocene compound in the present invention include compounds exemplified in International Publication No. 01/27124 Pamphlet and International Publication No. 2006/025540 Pamphlet, but this particularly limits the scope of the present invention. Is not to be done.

When using a metallocene compound for the production of the 4-methyl-1-pentene / propylene copolymer (A), the catalyst component is:
(A) a metallocene compound (for example, a metallocene compound represented by the above general formula (1) or (2));
(B) (b-1) an organoaluminum oxy compound,
(B-2) a compound that reacts with the metallocene compound (A) to form an ion pair, and (b-3) at least one compound selected from organoaluminum compounds;
If necessary,
(C) It is comprised from a particulate carrier. As a production method, for example, the method described in International Publication No. 01/27124 pamphlet can be employed.

  Further, it reacts with an organoaluminum oxy compound (b-1) (hereinafter also referred to as “component (b-1)”) and a metallocene compound (a) (hereinafter also referred to as “component (a)”) to form an ion pair. Specifics of compound to be formed (hereinafter also referred to as “component (b-2)”), organoaluminum compound (b-3) (hereinafter also referred to as “component (b-3)”), and particulate carrier (c) Examples include those compounds or carriers conventionally known in the field of olefin polymerization, such as the specific examples described in WO 01/27124.

In the production of the 4-methyl-1-pentene / propylene copolymer (A), the polymerization can be carried out by either a liquid phase polymerization method such as solution polymerization or suspension polymerization or a gas phase polymerization method.
In the liquid phase polymerization method, an inert hydrocarbon solvent may be used. Specific examples of the inert hydrocarbon include aliphatic carbon such as propane, butane, pentane, hexane, heptane, octane, decane, dodecane, and kerosene. Hydrogen; cycloaliphatic hydrocarbons such as cyclopentane, cyclohexane, methylcyclopentane, and methylcyclohexane; aromatic hydrocarbons such as benzene, toluene, and xylene; and halogens such as ethylene chloride, chlorobenzene, dichloromethane, trichloromethane, and tetrachloromethane And hydrocarbons, and mixtures thereof.

Bulk polymerization using 4-methyl-1-pentene and propylene itself as a solvent can also be carried out.
Further, 4-methyl-1-pentene / propylene copolymer having a controlled composition distribution was obtained by performing stepwise polymerization of 4-methyl-1-pentene and copolymerization of 4-methyl-1-pentene and propylene. It is also possible to obtain a polymer (A).

In carrying out the polymerization, the component (a) is usually 10 ⁻⁸ to 10 ⁻² mol, preferably 10 ⁻⁷ to 10 ⁻³ mol, in terms of group 4 metal atom in the periodic table, per liter of reaction volume. Used in various amounts. In the component (b-1), the molar ratio [(b-1) / M] of the component (b-1) and the transition metal atom (M) in the component (a) is usually 0.01 to 5000, Preferably it is used in such an amount that it is 0.05-2000. In the component (b-2), the molar ratio [(b-2) / M] of the component (b-2) and the transition metal atom (M) in the component (a) is usually 1 to 10, preferably 1. Used in an amount such that it is ˜5. Component (b-3) has a molar ratio [(b-2) / M] of component (b-3) to transition metal atom (M) in component (a) of usually 10 to 5000, preferably 20 It is used in an amount such that it is ˜2000.

The polymerization temperature is usually in the range of −50 to 200 ° C., preferably 0 to 100 ° C., more preferably 20 to 100 ° C.
The polymerization pressure is usually normal pressure to 10 MPa gauge pressure, preferably normal pressure to 5 MPa gauge pressure, and the polymerization reaction can be carried out in any of batch, semi-continuous and continuous methods. Furthermore, the polymerization can be performed in two or more stages having different reaction conditions.

  Hydrogen may be added for the purpose of controlling the molecular weight and polymerization activity of the produced polymer during the polymerization, and the amount is suitably about 0.001 to 100 NL per 1 kg of the total of 4-methyl-1-pentene and propylene.

<Other components (B)>
The material for a vibration damper of the present invention is a composition containing, in addition to the 4-methyl-1-pentene / propylene copolymer (A), other components (B) within a range not impairing the object of the present invention. There may be.

  Other components (B) include thermoplastic resins other than the copolymer (A), rubber, various weather stabilizers, heat stabilizers, antioxidants, ultraviolet absorbers, antistatic agents, antislip agents, Blocking agent, antifogging agent, nucleating agent, lubricant, pigment, dye, anti-aging agent, hydrochloric acid absorbent, inorganic or organic filler, organic or inorganic foaming agent, crosslinking agent, co-crosslinking agent, crosslinking aid, An adhesive, a softening agent, a flame retardant, etc. are mentioned.

(Thermoplastic resin or rubber)
There is no restriction | limiting in particular as said thermoplastic resin or rubber | gum (henceforth "resin or rubber | gum (B1)"), For example, the following resin and rubber | gum are mentioned.

Thermoplastic polyolefin resin (excluding the copolymer (A)), specifically, low density, medium density, high density polyethylene, high pressure method low density polyethylene, isotactic polypropylene, syndiotactic polypropylene, poly 1-butene, poly-4-methyl-1-pentene, poly-3-methyl-1-butene, ethylene / α-olefin copolymer, propylene / α-olefin copolymer, 1-butene / α-olefin copolymer , Cyclic olefin copolymer, chlorinated polyolefin;
Thermoplastic polyamide resins, specifically aliphatic polyamides (nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon 612);
Thermoplastic polyester resin, specifically, polyethylene terephthalate, polybutylene terephthalate, polyester elastomer;
Thermoplastic vinyl aromatic resins, specifically polystyrene, ABS resin, AS resin, styrene elastomer (styrene / butadiene / styrene block polymer, styrene / isoprene / styrene block polymer, styrene / isobutylene / styrene block polymer, and The aforementioned hydrogenated product);
Thermoplastic polyurethane; vinyl chloride resin; vinylidene chloride resin; acrylic resin; ethylene / vinyl acetate copolymer; ethylene / methacrylic acid acrylate copolymer; ionomer; ethylene / vinyl alcohol copolymer; polyvinyl alcohol; Polyacetal; Polyphenylene oxide; Polyphenylene sulfide polyimide; Polyarylate; Polysulfone; Polyethersulfone; Rosin resin; Terpene resin; Petroleum resin;
Copolymer rubber, specifically, ethylene / propylene / diene copolymer, propylene / propylene / diene copolymer, 1-butene / propylene / diene copolymer, polybutadiene rubber, polyisoprene rubber, neoprene rubber, nitrile Examples thereof include rubber, butyl rubber, halogenated butyl rubber, polyisobutylene rubber, natural rubber, and silicone rubber.

These thermoplastic resins and rubbers may be used alone or in combination of two or more.
Among these, low density, medium density, high density polyethylene, high pressure method low density polyethylene, isotactic polypropylene, syndiotactic polypropylene, poly 1-butene, poly 4-methyl-1-pentene, poly 3-methyl-1 -Butene, ethylene / α-olefin copolymer, propylene / α-olefin copolymer, 1-butene / α-olefin copolymer, polystyrene, styrene elastomer, ethylene / vinyl acetate copolymer, ethylene / methacrylic acid Acrylate copolymer, ionomer, fluorine resin, rosin resin, terpene resin and petroleum resin, ethylene / α-olefin / diene copolymer, propylene / α-olefin / diene copolymer, 1-butene / α- Olefin-diene copolymer, polybutadiene rubber, polyisopropylene Ren rubber, neoprene rubber, nitrile rubber, butyl rubber, polyisobutylene rubber, and silicone rubber are preferable. Isotactic polypropylene, poly-1-butene, poly-4-methyl-1-pentene, and ethylene / α-olefin copolymer are preferable. Polymer, propylene / α-olefin copolymer, 1-butene / α-olefin copolymer, ethylene / vinyl acetate copolymer, styrene elastomer, rosin resin, terpene resin, petroleum resin, ethylene / α-olefin・ Diene copolymer, propylene / α-olefin / diene copolymer, 1-butene / α-olefin / diene copolymer, polybutadiene rubber, polyisoprene rubber, neoprene rubber, nitrile rubber, butyl rubber, polyisobutylene rubber, silicone Rubber.

  Examples of the rosin resin include natural rosin, polymerized rosin, modified rosin and rosin derivatives modified with maleic acid, fumaric acid, (meth) acrylic acid, and the like. Examples of the rosin derivative include the above-mentioned natural rosin, polymerized rosin or esterified product of modified rosin, phenol-modified product and esterified product thereof. Furthermore, these hydrogenated substances can also be mentioned.

  Examples of the terpene resin include resins composed of α-pinene, β-pinene, limonene, dipentene, terpene phenol, terpene alcohol, terpene aldehyde, etc., and α-pinene, β-pinene, limonene, dipentene, and the like. An aromatic modified terpene resin obtained by polymerizing aromatic monomers such as α-methylstyrene and isopropenyltoluene. Moreover, these hydrogenated substances can also be mentioned.

  Examples of the petroleum resin include an aliphatic petroleum resin mainly containing a C5 fraction of tar naphtha, an aromatic petroleum resin mainly containing a C9 fraction and a copolymer petroleum resin thereof. That is, C5 petroleum resin (resin obtained by polymerizing C5 fraction of naphtha cracked oil), C9 petroleum resin (resin obtained by polymerizing C9 fraction of naphtha cracked oil), C5C9 copolymerized petroleum resin (C5 fraction of naphtha cracked oil) And styrene / α-methylstyrene copolymer petroleum resin, α-methylstyrene polymer petroleum resin, isopropenyltoluene polymer petroleum resin, and the like. Coumarone indene resins containing styrenes, indenes, coumarone, other dicyclopentadiene, alkylphenol resins represented by condensates of p-tertiarybutylphenol and acetylene, o-xylene, p-xylene or Examples thereof include xylene-based resins obtained by reacting m-xylene with formalin.

  One or more resins selected from the group consisting of rosin resins, terpene resins, and petroleum resins are preferably hydrogenated derivatives because they are excellent in weather resistance and discoloration resistance. The softening point of the resin by the ring and ball method is preferably in the range of 40 to 180 ° C. The number average molecular weight (Mn) molecular weight measured by GPC of the resin is preferably in the range of about 100 to 10,000.

A commercially available product may be used as one or more resins selected from the group consisting of rosin resins, terpene resins and petroleum resins.
In the case where the composition contains the resin or rubber (B1), if the total amount of the copolymer (A) and the resin or rubber (B1) is 100 parts by weight, the vibration damping damper From the viewpoint of property, the lower limit of the content of the copolymer (A) in the composition is preferably 30 parts by weight, more preferably 45 parts by weight, particularly preferably 50 parts by weight. From the viewpoint of vibration and lightness, the upper limit of the copolymer (A) content is preferably 98 parts by weight, more preferably 95 parts by weight, and particularly preferably 90 parts by weight.

(Softener)
As the softener, a conventionally known softener can be used. Specifically, petroleum-based substances such as process oil, lubricating oil, paraffin, liquid paraffin, polyethylene wax, polypropylene wax, petroleum asphalt and petroleum jelly; coal tars such as coal tar and coal tar pitch; castor oil, linseed oil, Fatty oils such as rapeseed oil, soybean oil and coconut oil; waxes such as tall oil, beeswax, carnauba wax and lanolin; ricinoleic acid, palmitic acid, stearic acid, 12-hydroxystearic acid, montanic acid, oleic acid and elca Fatty acids such as acids or metal salts thereof; synthetic polymers such as petroleum resins, coumarone indene resins and atactic polypropylene; ester plasticizers such as dioctyl phthalate, dioctyl adipate and dioctyl sebacate; other microcrystals WAX, and liquid polybutadiene or its modified product or hydrogenated product; and liquid Thiokol and the like.

(Inorganic filler)
Examples of the inorganic filler include powder fillers such as mica, carbon black, silica, calcium carbonate, talc, graphite, stainless steel, and aluminum; and fibrous fillers such as glass fiber and metal fiber. Among these, mica is preferable because it has an effect of improving the attenuation.

  When the vibration damper material of the present invention is composed of a composition containing another component (B), the composition is prepared by mixing each component with a conventionally known mixing method such as plastmill, Henschel mixer, V-blender, ribbon blender. It can be produced by using a method of mixing with a tumbler blender, kneader ruder or the like, or after mixing, melt kneading with a single screw extruder, twin screw extruder, kneader, Banbury mixer, etc., and granulating or grinding. .

<Material for damping damper>
The vibration damper material of the present invention contains at least the 4-methyl-1-pentene / propylene copolymer (A) and is excellent in vibration damping properties and light weight.

Furthermore, the vibration damper material of the present invention preferably has the following physical properties (x) or (y).
(X): Obtained by measuring the dynamic viscoelasticity in the temperature range of −40 ° C. to 150 ° C. at a frequency of 10 rad / s (details of measurement conditions and the like are as described in the column of Examples described later). The maximum value of the loss tangent tan δ is in the range of 0.5 to 10, preferably 0.7 to 8, more preferably 0.7 to 6, and further preferably 0.7 to 4. The temperature at which the value of tan δ is maximized is in the range of −25 ° C. to 100 ° C., preferably −20 ° C. to 50 ° C., more preferably −10 ° C. to 40 ° C.

  The maximum value of tan δ is controlled by the comonomer composition ratio of the 4-methyl-1-pentene / propylene copolymer (A) or the mixing ratio of the copolymer (A) and other components in the composition. Can do.

  (Y): The value of loss tangent tan δ obtained by dynamic viscoelasticity measurement at 20 ° C. and a frequency of 10 rad / s (details of measurement conditions and the like are as described in the column of Examples described later) It is 0.1-5.0, More preferably, it is 0.3-4.0, More preferably, it exists in the range of 0.5-3.5. The value of tan δ at 20 ° C. is the comonomer composition ratio of 4-methyl-1-pentene / propylene copolymer (A), or the mixing ratio of copolymer (A) and other components in the composition, etc. Can be controlled.

The material for a vibration damper of the present invention preferably has a Shore A hardness value (a value after 15 seconds after contact with the push needle. Details of measurement conditions and the like are as described in the column of Examples described later). Is from 5 to 95, more preferably from 10 to 85, and even more preferably from 15 to 80. Further, the change ΔHS of the value of Shore A hardness (measured in the state of a press sheet having a thickness of 3 mm according to JIS K6253) defined by the following formula is preferably 10 to 60, more preferably 10 to 50, and still more preferably. Is 15-40.
ΔHS = (Shore A hardness value immediately after start of pressing needle contact−Shore A hardness value 15 seconds after start of pressing needle contact)

Shore A hardness values of the damping damper material according to the present invention, the mixing of the 4-methyl-1 component of the damping damper material of the pentene-propylene copolymer the comonomer composition ratio of (A), or the invention If the Shore A hardness value is within the above range, the vibration damping material is excellent in flexibility.

<Graft modification>
The 4-methyl-1-pentene / propylene copolymer (A) may be partly or wholly graft-modified within the range not impairing the object of the present invention, and the other component (B) heat. Part or all of the plastic resin may be graft-modified. Examples of the polar compound used for graft modification and the graft modification method include conventionally known compounds and methods. For example, the compounds and methods described in JP-A-2008-127440 can be employed.

The graft amount of the graft modified product is usually 0.1 to 40% by weight, preferably 0.2 to 30% by weight, and more preferably 0.2 to 20% by weight.
When the 4-methyl-1-pentene / propylene copolymer (A) or the thermoplastic resin is graft-modified, it is advantageous in terms of compatibility or adhesiveness of the composition.

<Crosslinking>
At least a part or all of the vibration damper material may be crosslinked with a crosslinking agent.

  There is no restriction | limiting in particular as a crosslinking agent, Sulfur, an organic peroxide, and a SiH group containing compound are mentioned. When sulfur is used, the amount thereof is preferably 0 with respect to a total of 100 parts by weight of the copolymer (A) and the thermoplastic resin as the other component (B) in the material for damping damper. .1 to 10 parts by weight. When the organic peroxide is used, the amount thereof is preferably 0.05 to 15% by weight with respect to a total of 100 parts by weight of the copolymer (A) and the thermoplastic resin in the vibration damper material. Part.

  Further, when the SiH group-containing compound is used, the amount thereof is preferably 0.2 to a total of 100 parts by weight of the copolymer (A) and the thermoplastic resin in the vibration damper material. 20 parts by weight, more preferably 0.5 to 10 parts by weight, still more preferably 0.5 to 5 parts by weight. When using an SiH group-containing compound, a silane coupling agent and / or a reaction inhibitor may be added as a catalyst and optional components.

[Vibration damper]
The vibration damper of the present invention comprises at least a part of the material for a vibration damper of the present invention. The damping damper of the present invention is the same as the conventional damping damper except that the material is the damping damper material of the present invention, and is manufactured by the same method as the conventional damping damper manufacturing method. be able to.

  The structure of the vibration damper of the present invention includes, for example, a structure in which at least one vibration damping material layer made of the material for vibration damping damper of the present invention and more steel plates are alternately laminated, and the vibration damping of the present invention. Examples include a structure in which at least one damping material layer made of a damper material and more steel pipes than that are alternately stacked in a concentric manner.

Examples of the steel plate or steel pipe include general structural steel plates, cold rolled steel plates, carbon steel plates, stainless steel plates, and low alloy steel plates.
The damping damper material and damping damper of the present invention have the following advantages.

-Since it contains a copolymer (A) having a low impact resilience and a high loss tangent tan δ, it has excellent vibration damping properties.
-Since Shore A hardness is low, it has excellent stress absorption.
-Light weight due to low density.
・ Excellent damping performance due to high loss factor by damping performance measurement by central excitation method.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited at all by these Examples.

[Measurement conditions]
The measurement conditions of the physical properties in the examples are as follows.
〔composition〕
The 4-methyl-1-pentene and propylene contents in the polymer were measured by ¹³ C-NMR with the following apparatus and conditions. Using an ECP500 type nuclear magnetic resonance apparatus manufactured by JEOL Ltd., a mixed solvent of orthodichlorobenzene / heavy benzene (80/20% by volume) as a solvent, sample concentration 55 mg / 0.6 mL, measurement temperature 120 ° C., observation nucleus ¹³ C (125 MHz), sequence is single pulse proton decoupling, pulse width is 4.7 μs (45 ° pulse), repetition time is 5.5 seconds, integration number is 10,000 times or more, 27.50 ppm as standard for chemical shift Measured as a value.

〔density〕
The density of the copolymer (A) was calculated from the weight of each sample measured in water and in air using ALFA MIRAGE electronic hydrometer MD-300S according to ASTM D 1505 (in-water replacement method).

[Melting point (Tm)]
The melting point (Tm) of the polymer was measured with a differential scanning calorimeter (DSC) using a DSC220C apparatus manufactured by Seiko Instruments Inc. Samples 7-12 mg obtained from the polymerization were sealed in an aluminum pan and heated from room temperature to 200 ° C. at 10 ° C./min. The sample was held at 200 ° C. for 5 minutes to completely melt and then cooled to −50 ° C. at 10 ° C./min. After 5 minutes at −50 ° C., the sample was heated again to 200 ° C. at 10 ° C./min. This peak temperature in the second heating (second time) was adopted as the melting point (Tm).

[Intrinsic viscosity]
The intrinsic viscosity [η] was measured at 135 ° C. using a decalin solvent.
[Molecular weight (Mw, Mn) / Molecular weight distribution (Mw / Mn)]
The molecular weight of the copolymer (A) was measured using a liquid chromatograph: Waters ALC / GPC 150-C plus (integrated refractometer detector), and two columns of GMH6-HT manufactured by Tosoh Corporation and GMH6. -Two HTLs were connected in series, and o-dichlorobenzene was used as a mobile phase medium, and measurement was performed at a flow rate of 1.0 ml / min and 140 ° C.

  Mw / Mn value and Mz / Mw value were calculated by analyzing the obtained chromatogram by a known method using a calibration curve using a standard polystyrene sample. The measurement time per sample was 60 minutes.

[Methyl acetate extraction amount]
The polymer was collected in a Soxhlet extractor, heated to reflux under methyl acetate, the amount of polymer before and after reflux was weighed, and the amount of extraction (% by weight) was calculated.

[Methods for producing various measurement press sheets]
Each of the damping damper materials of the examples , reference examples, and comparative examples (namely, the damping damper material made only of a polymer or the damping damper material made of a resin composition) was set at 190 ° C. A sheet was formed at a pressure of 10 MPa using a hydraulic hot press manufactured by Komatsu. In the case of a sheet having a thickness of 1 to 3 mm (spacer shape; 80 × 80 × 0.5 to 3 mm, 4 pieces on a 240 × 240 × 2 mm thick plate), the remaining heat is about 5 to 7 minutes, and 1 to 2 at 10 MPa. After pressurizing for a minute, using another hydraulic hot press machine manufactured by Shinfuji Metal Industry Co., Ltd. set to 20 ° C., the sample was compressed at 10 MPa and cooled for about 5 minutes to prepare a measurement sample. A 5 mm thick brass plate was used as the hot plate. Samples prepared by the above method were used for various physical property evaluation samples.

[Shore A hardness]
In the measurement of Shore A hardness (based on JIS K6253), a press sheet having a thickness of 3 mm was used as a measurement sample, and the graduations were read immediately after the start of pressing contact and 15 seconds after the start of pressing contact. Further, the change ΔHS of the Shore A hardness value defined by the following equation was obtained as follows.
ΔHS = (Shore hardness value immediately after start of pressing needle contact−Shore hardness value 15 seconds after start of pressing needle contact).

(Dynamic viscoelasticity)
A press sheet having a thickness of 3 mm was prepared, and a strip of 45 mm × 10 mm × 3 mm necessary for dynamic viscoelasticity measurement was cut out. The temperature dependence of dynamic viscoelasticity from −40 to 180 ° C. was measured at a frequency of 10 rad / s using MTON 301 manufactured by ANTONPaar, and the loss tangent (tan δ) due to the glass transition temperature was the peak value (maximum value). ) (Hereinafter also referred to as “peak temperature”), and the value of loss tangent (tan δ) at that time.
Furthermore, tan δ at 20 ° C. was measured.

[Rebound resilience]
A press sheet having a thickness of 6 mm was prepared, and in accordance with JIS K6400, a rebound height L (mm) when a hard ball of 16.310 g was dropped from a height of 460 mm onto the press sheet was measured. The impact resilience defined by the following formula was determined.
Rebound resilience (%) = L (mm) / 460 × 100

[Vibration control test by central excitation method]
Each of the damping damper materials in Examples , Reference Examples and Comparative Examples was formed into a sheet of 20 mm × 200 mm × 2 mm at a pressure of 10 MPa using a hydraulic hot press machine manufactured by Shindo Metal Industry Co., Ltd. set at 190 ° C. Was sandwiched between 2 mm thick steel plates from both sides to produce a temperature-unconstrained vibration damping material. Here, the sheet | seat was crimped | bonded to the iron plate with the pressure of 190 degreeC and 10 Mpa by the hot press method.

  About the obtained unrestrained type damping material, the loss factor was measured by a central vibration method at a temperature of 23 ° C. using a loss factor measuring device (manufactured by Shimadzu Corporation). The damping performance was evaluated by comparing the maximum values of the obtained loss factors. Note that the greater the loss factor, the higher the damping performance.

[Example 1]
750 ml of 4-methyl-1-pentene was charged at 23 ° C. into a SUS autoclave with a stirring blade having a capacity of 1.5 liters sufficiently purged with nitrogen. The autoclave was charged with 0.75 ml of a 1.0 mmol / ml toluene solution of triisobutylaluminum (TIBAl), and the stirrer was rotated. Next, the autoclave was heated to an internal temperature of 30 ° C. and pressurized with propylene so that the total pressure was 0.74 MPaG. Subsequently, methylaluminoxane prepared in advance, 1 mmol in terms of Al, diphenylmethylene (1-methyl-3-t-butyl-cyclopentadienyl) (2,7-di-t-butyl-fluorenyl) A toluene solution containing 0.35 ml of zirconium dichloride in an amount of 0.005 mmol was pressed into the autoclave with nitrogen to initiate polymerization. Thereafter, the temperature of the autoclave was adjusted to 60 ° C. for 60 minutes. Sixty minutes after the start of polymerization, 5 ml of methanol was injected into the autoclave with nitrogen to stop the polymerization, and the autoclave was depressurized to atmospheric pressure. Acetone was poured into the reaction solution with stirring. The resulting rubbery polymer containing the solvent was dried at 130 ° C. under reduced pressure for 12 hours. The obtained polymer was 56.3 g, and the propylene content in the polymer was 75.3 mol%. The Tm of the polymer was not observed, and the intrinsic viscosity [η] was 1.5 dl / g. The molecular weight distribution obtained from GPC was Mw = 287000, Mn = 144000, and Mw / Mn = 2.0. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[Example 2]
Polymerization was carried out in the same manner as in Example 1 except that propylene was pressurized so that the total pressure in the polymerization vessel was 0.68 MPaG. The obtained polymer was 45.9 g, and the propylene content in the polymer was 68.9 mol%. The Tm of the polymer was not observed, and the intrinsic viscosity [η] was 1.5 dl / g. The molecular weight distribution obtained from GPC was Mw = 267000, Mn = 1340, Mw / Mn = 2.0. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[ Reference Example 3]
Polymerization was carried out in the same manner as in Example 1 except that propylene was pressurized so that the total pressure in the polymerization vessel was 0.35 MPaG. The obtained polymer was 46.9 g, and the propylene content in the polymer was 52.7 mol%. The Tm of the polymer was not observed, and the intrinsic viscosity [η] = 1.4 dl / g. The molecular weight distribution obtained from GPC was Mw = 277000, Mn = 132000, Mw / Mn = 2.1. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[ Reference Example 4]
Polymerization was carried out in the same manner as in Example 1 except that propylene was pressurized so that the total pressure in the polymerization vessel was 0.20 MPaG. The obtained polymer was 35.5 g, and the propylene content in the polymer was 40.0 mol%. The Tm of the polymer was not observed, and the intrinsic viscosity [η] = 1.4 dl / g. The molecular weights obtained from GPC were Mw = 272000, Mn = 131000, Mw / Mn = 2.1. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[ Reference Example 5]
Polymerization was carried out in the same manner as in Example 1 except that propylene was pressurized so that the total pressure in the polymerization vessel was 0.15 MPaG. The obtained polymer was 46.9 g, and the propylene content in the polymer was 38.0 mol%. The Tm of the polymer was not observed, and the intrinsic viscosity [η] = 1.4 dl / g. The molecular weight distribution obtained from GPC was Mw = 295000, Mn = 142000, Mw / Mn = 2.1. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[ Reference Example 6]
Polymerization was performed in the same manner as in Example 1 except that propylene was pressurized so that the total pressure in the polymerization vessel was 0.10 MPaG. The obtained polymer was 29.7 g, and the propylene content in the polymer was 28.1 mol%. The Tm of the polymer was not observed, and the intrinsic viscosity [η] = 1.4 dl / g. The molecular weight distribution obtained from GPC was Mw = 289000, Mn = 138000, and Mw / Mn = 2.1. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[ Reference Example 7]
Polymerization was carried out in the same manner as in Example 1 except that propylene was pressurized so that the total pressure in the polymerization vessel was 0.09 MPaG. The obtained polymer was 24.7 g, and the propylene content in the polymer was 27.5 mol%. The Tm of the polymer was not observed, and the intrinsic viscosity [η] = 1.54 dl / g. The molecular weight distribution obtained from GPC was Mw = 337000, Mn = 164000, and Mw / Mn = 2.06. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[Comparative Example 1]
Polymerization was carried out in the same manner as in Example 1 except that 100 ml of 4-methyl-1-pentene in the polymerization vessel and 650 ml of hexane as a polymerization solvent were added and pressurized with propylene so that the total pressure became 0.68 MPaG. . The obtained polymer was 21.2 g, and the propylene content in the polymer was 90.0 mol%. The polymer had a Tm of 69.1 ° C. and an intrinsic viscosity [η] of 1.31 dl / g. The molecular weight distribution obtained from GPC was Mw = 262000, Mn = 133000, Mw / Mn = 2.0. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[Comparative Example 2]
Polymerization was carried out in the same manner as in Example 1 except that 750 ml of 4-methyl-1-pentene in the polymerization vessel was pressurized with propylene so that the total pressure was 0.05 MPaG, and the polymerization temperature was 60 ° C. The obtained polymer was 21.2 g, and the propylene content in the polymer was 9.8 mol%. The polymer had a Tm of 144.1 ° C. and an intrinsic viscosity [η] of 1.45 dl / g. The molecular weight distribution obtained from GPC was Mw = 296000, Mn = 148000, and Mw / Mn = 2.1. Table 1 shows the physical properties of the obtained polymer (material for damping damper).

[Comparative Example 3]
750 ml of 4-methyl-1-pentene was charged at 23 ° C. into a 1.5-liter SUS autoclave with a stirring blade sufficiently purged with nitrogen. To this autoclave, 0.94 ml of a 1.0 mmol / ml toluene solution of triethylaluminum (TEA) was charged, 120 Nml of hydrogen gas was introduced, and the stirrer was rotated. Next, the autoclave was heated to an internal temperature of 60 ° C. and pressurized with propylene so that the total pressure was 0.21 MPaG. Subsequently, a toluene solution containing 0.013 mmol of a solid titanium catalyst prepared on the basis of the published Japanese Patent Application Laid-Open No. 2008-144155 was injected into the autoclave with 4.7 ml of nitrogen to initiate polymerization. Thereafter, the temperature of the autoclave was adjusted to 60 ° C. for 60 minutes. Sixty minutes after the start of polymerization, 5 ml of methanol was injected into the autoclave with nitrogen to stop the polymerization, and the autoclave was depressurized to atmospheric pressure. Acetone was poured into the reaction solution with stirring. The resulting rubbery polymer containing the solvent was dried at 130 ° C. under reduced pressure for 12 hours. The obtained polymer was 47.9 g, and the propylene content in the polymer was 67.2 mol%. The Tm of the polymer was not observed, and the intrinsic viscosity [η] was 1.78 dl / g. The obtained physical properties are shown in Table 1. It can be seen from the peak value of tan δ that the vibration damping performance is poor.

[Comparative Example 4]
A commercially available hydrogenated styrene / isoprene / styrene copolymer (manufactured by Kuraray Co., Ltd., Hibler 5127) was used. The MFR at 190 ° C. was 5 g / 10 min. Table 1 shows the physical properties of the comparative examples. It turns out that it is inferior to lightness from the value of a density.

[Comparative Example 5]
A commercially available ethylene / α-olefin copolymer (Mitsui Chemicals, Tuffmer P0680) was used. The MFR at 190 ° C. was 0.8 g / 10 min. Table 1 shows the physical properties of the comparative examples. It can be seen from the rebound resilience, the peak value of tan δ, and the temperature value that the vibration damping properties are poor.

[Comparative Example 6]
A commercially available ethylene / α-olefin copolymer (Mitsui Chemicals, Tuffmer A4070) was used. The MFR at 190 ° C. was 0.8 g / 10 min. Table 1 shows the physical properties of the comparative examples. It can be seen from the rebound resilience, the peak value of tan δ, and the temperature value that the vibration damping properties are poor.

表１から明らかなように、実施例および参考例に示したポリマー（共重合体（Ａ））は、ｔａｎδ値および反発弾性率の値、中央加振法から測定した損失係数から、制振性に優れている。したがって、これらのポリマーを含む制振ダンパー用材料は制振性に優れており、該制振材から制振性に優れた制振ダンパーを製造できることがわかる。

As is clear from Table 1, the polymers (copolymer (A)) shown in the examples and reference examples are based on the tan δ value, the rebound resilience value, and the loss coefficient measured by the central vibration method. Is excellent. Therefore, it can be seen that the damping damper material containing these polymers is excellent in damping properties, and a damping damper having excellent damping properties can be produced from the damping material.

Example 8
80 parts by weight of the 4-methyl-1-pentene / propylene copolymer obtained in Example 2 and 20 parts by weight of Polypropylene F107 manufactured by Prime Polymer Co., Ltd. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  This was cut into an appropriate size to obtain a measurement sample. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 9]
80 parts by weight of the 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 5 and 20 parts by weight of Polypropylene F107 manufactured by Prime Polymer Co., Ltd. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  This was cut into an appropriate size to obtain a measurement sample. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

Example 10
70 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Example 2, 20 parts by weight of polypropylene F107 manufactured by Prime Polymer Co., Ltd., and ethylene / α-olefin manufactured by Mitsui Chemicals, Inc. 10 parts by weight of copolymer Tuffmer A4070 was blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

Example 11
45 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Example 1 and 55 parts by weight of hydrogenated styrene / isoprene / styrene copolymer Hibler 5127 manufactured by Kuraray Co., Ltd. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 12]
45 parts by weight of the 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 5 and 55 parts by weight of an additive-added styrene / isoprene / styrene copolymer Hibler 5127 manufactured by Kuraray Co., Ltd. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 13]
65 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 5 and 35 parts by weight of hydrogenated styrene / isoprene / styrene copolymer Hibler 5127 manufactured by Kuraray Co., Ltd. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

Example 14
75 parts by weight of the 4-methyl-1-pentene / propylene copolymer obtained in Example 1 and 25 parts by weight of Miralastomer 5030N manufactured by Mitsui Chemicals, Inc. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

Example 15
50 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Example 1 and 50 parts by weight of Miralastomer 5030N manufactured by Mitsui Chemicals, Inc. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 16]
50 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 5 and 50 parts by weight of Miralastomer 5030N manufactured by Mitsui Chemicals, Inc. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 17]
75 parts by weight of the 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 7 and 25 parts by weight of Miralastomer 5030N manufactured by Mitsui Chemicals, Inc. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen from the peak value of tan δ that the vibration damping is excellent.

[ Reference Example 18]
50 parts by weight of the 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 7 and 50 parts by weight of Miralastomer 5030N manufactured by Mitsui Chemicals, Inc. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 19]
30 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 7 and 70 parts by weight of Miralastomer 5030N manufactured by Mitsui Chemicals, Inc. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 20]
75 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 5 and 25 parts by weight of Mitsui Chemicals, Inc. ethylene / α-olefin copolymer Tuffmer A4050S were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 21]
75 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 5 and 25 parts by weight of Evolue SP0540 manufactured by Prime Polymer Co., Ltd. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 22]
50 parts by weight of 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 5 and 50 parts by weight of Evolue SP0540 manufactured by Prime Polymer Co., Ltd. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[ Reference Example 23]
75 parts by weight of the 4-methyl-1-pentene / propylene copolymer obtained in Reference Example 5 and 25 parts by weight of Asahi Kasei Corporation low density polyethylene F2204.1 were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen that the peak value of tan δ is high and the vibration damping property is excellent.

[Comparative Example 7]
70 parts by weight of polypropylene F107 manufactured by Prime Polymer Co., Ltd. and 30 parts by weight of ethylene / α-olefin copolymer Tuffmer H130 manufactured by Mitsui Chemicals, Inc. were blended. Furthermore, 1000 ppm of the hindered phenolic antioxidant Irganox 1010 manufactured by Ciba Japan Co., Ltd., 1000 ppm of the phosphorus processing thermal stabilizer Irgafos 168, and 500 ppm of calcium stearate manufactured by NOF Co., Ltd. with respect to the obtained mixture. Blended. These were melted using a lab plast mill (biaxial batch type melt kneader) manufactured by Toyo Seiki Co., Ltd. at a set temperature of 200 ° C., with a resin charge of 40 g (apparatus batch volume = 60 cm ³ ), 50 rpm, and 5 minutes. After kneading, it was taken out and cooled with a cooling press set at 20 ° C. to obtain a sheet-shaped resin composition (material for damping damper).

  A sample for measurement was prepared by cutting the sample into an appropriate size. Further, a press sheet was prepared using the sample, and the physical properties were measured. Table 2 shows the measurement results of various physical properties. It can be seen from the rebound resilience that the vibration damping is inferior.

[Comparative Example 8]
Table 2 shows the physical properties of commercially available olefin-based thermoplastic elastomer Miralastomer 5030N manufactured by Mitsui Chemicals, Inc.

Claims (3)

A material for a vibration damper comprising at least a 4-methyl-1-pentene / propylene copolymer (A) satisfying the following requirements (a) and (b).
(A) a structural unit (i) derived from 15 to 32 mol% of 4-methyl-1-pentene, and a structural unit (ii) derived from 68 to 85 mol% of propylene (provided that the structural unit (i) The sum of the proportion and the proportion of the structural unit (ii) is 100 mol%).
(B) The density is in the range of 830 to 860 kg / m ³ . A resin composition containing the 4-methyl-1-pentene / propylene copolymer (A) and a thermoplastic resin (excluding the copolymer (A)) or rubber (B1), which has the following requirements: The material for a vibration damper according to claim 1, wherein (x) and (y) are satisfied.
(X) The maximum value of the loss tangent tan δ obtained by performing dynamic viscoelasticity measurement at a frequency of 10 rad / s in the temperature range of −40 to 150 ° C. is 0.5 to 10.
(Y) The value of loss tangent tan δ obtained by performing dynamic viscoelasticity measurement at 20 ° C. and a frequency of 10 rad / s is in the range of 0.1 to 5.0.   A vibration damper comprising at least a part of the material for a vibration damper according to claim 1 or 2.