WO2023276571A1 - 熱可塑性エラストマー組成物およびその成形体 - Google Patents
熱可塑性エラストマー組成物およびその成形体 Download PDFInfo
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- WO2023276571A1 WO2023276571A1 PCT/JP2022/022856 JP2022022856W WO2023276571A1 WO 2023276571 A1 WO2023276571 A1 WO 2023276571A1 JP 2022022856 W JP2022022856 W JP 2022022856W WO 2023276571 A1 WO2023276571 A1 WO 2023276571A1
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
- C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
- C08G8/10—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ with phenol
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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
- C08K3/16—Halogen-containing compounds
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- 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
- C08K5/01—Hydrocarbons
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- 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
-
- 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
- C08L23/10—Homopolymers or copolymers of propene
-
- 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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/30—Applications used for thermoforming
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
Definitions
- the present invention relates to a thermoplastic elastomer composition having excellent surface smoothness and high-temperature rubber elasticity, and a molded article thereof.
- thermoplastic elastomer is a material that softens when heated and has fluidity, and has rubber elasticity when cooled. Specifically, when molding, it melts at the processing temperature and can be easily molded in the same way as well-known thermoplastic resins. has the same physical properties as crosslinked rubber. In this way, thermoplastic elastomers have moldability similar to that of thermoplastic resins, have flexibility and unique rubber elasticity, and are recyclable. It is widely used for parts, electric wire coating materials, sundries, etc.
- Patent Document 1 discloses an automobile weatherstrip using a thermoplastic elastomer composition containing an olefin resin, an ethylene/ ⁇ -olefin copolymer rubber, and a hydrogenated aromatic vinyl/conjugated diene compound block copolymer. ing.
- Patent Document 2 discloses a thermoplastic elastomer composition which contains a vinyl aromatic copolymer rubber, an ethylene copolymer rubber, and an olefin resin and has excellent molding appearance and excellent compression set at high temperatures. ing.
- Thermoplastic elastomers and their molded products are used in visible parts such as automobile window frame seals. In such applications, not only rubber elasticity but also high designability of the molded product is required, and a smooth surface appearance is required. In addition, in the process of assembling parts, different parts are often joined to each other via double-sided tape or adhesive, and the surface of the molded product must be smooth in order to increase the degree of adhesion with double-sided tape or adhesive. is required. That is, there is a demand for a thermoplastic elastomer having a smooth surface while maintaining rubber elasticity at high temperatures, and a molded article thereof.
- thermoplastic elastomer composition and the automotive weatherstrip molded article described in Patent Document 1 are silent about surface smoothness and rubber elasticity at high temperatures. , confirms extrusion moldability, but does not specifically mention surface smoothness, and there is room for improvement in each case.
- the present invention has been made in view of such conventional problems, and an object of the present invention is to provide a thermoplastic elastomer composition having excellent surface smoothness and rubber elasticity at high temperatures, and a molded article thereof.
- component (A) polyolefin
- component (B) ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber
- component (C) aromatic vinyl compound.
- thermoplastic elastomer composition having
- the gist of the present invention is as follows.
- thermoplastic elastomer composition characterized by containing 0.05 to 2.0% by mass.
- thermoplastic elastomer composition according to [1] which contains 50 parts by mass or more and 300 parts by mass or less of component (D) with respect to a total of 100 parts by mass of components (A) and (B).
- the component (C) is a block copolymer containing 1% by mass or more and 100% by mass or less of the PQ type diblock copolymer and/or a hydrogenated product thereof, [1] to [6 ]
- the thermoplastic elastomer composition according to any one of .
- thermoplastic elastomer composition according to any one of the above.
- thermoplastic elastomer composition according to any one of [1] to [9], wherein the component (E) contains a phenolic resin and tin chloride.
- thermoplastic elastomer composition of any one of [1] to [10], wherein the component (A) has a polystyrene equivalent weight average molecular weight of 270,000 or more and 1,000,000 or less as measured by gel permeation chromatography.
- thermoplastic elastomer composition obtained by molding the thermoplastic elastomer composition according to any one of [1] to [11].
- thermoplastic elastomer composition of the present invention is excellent in surface smoothness and rubber elasticity at high temperatures. Therefore, the thermoplastic elastomer composition of the present invention can be used for automobile parts, construction parts, medical parts, electric wire coating materials, miscellaneous goods, and the like. It is expected to be suitably used for boots, packings and gaskets.
- thermoplastic elastomer composition contains 0 PQ type diblock copolymer and/or its hydrogenated product relative to the total 100% by mass of components (A) to (E) below. .05 to 2.0% by mass of the thermoplastic elastomer composition.
- thermoplastic elastomer composition of the present invention contains 0 of the following PQ-type diblock copolymer and/or its hydrogenated product relative to the total 100% by mass of components (A) to (D) below. .05 to 2.0% by mass of the thermoplastic elastomer composition.
- thermoplastic elastomer composition of the present invention contains components (A) to (D) and a cross-linking agent containing a phenol resin as component (E), components (A) to (E) A thermoplastic elastomer composition characterized by containing 0.05 to 2.0% by mass of a PQ type diblock copolymer and/or a hydrogenated product thereof with respect to a total of 100% by mass.
- total 100% by mass of components (A) to (E) corresponds to "total 100% by mass of components (A) to (D)" when component (E) is not included.
- PQ type diblock copolymer and/or hydrogenated product thereof A PQ type diblock copolymer and/or a hydrogenated product thereof (hereinafter referred to as "PQ type (hydrogenated ) is sometimes referred to as “diblock copolymer”) is 0.05 to 2.0% by mass.
- PQ type (hydrogenated ) is sometimes referred to as “diblock copolymer”
- diblock copolymer is 0.05 to 2.0% by mass.
- the mechanism of the expression of surface smoothness is that, compared to the PQP type, the PQ type (hydrogenated) diblock copolymer has a higher molecular mobility of the polymer block Q, so that the surface of the molded product has Presumably, it precipitates easily and acts to fill the unevenness of the surface formed by aggregation of the component (B), smoothing the unevenness of the surface and improving the surface smoothness.
- the lower limit of the content of the PQ type (hydrogenated) diblock copolymer is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, from the viewpoint of improving surface smoothness, and 0.2% by mass. % or more is more preferable.
- the upper limit is preferably 2.0% by mass or less, more preferably 1.8% by mass or less, from the viewpoint of maintaining rubber elasticity at high temperatures.
- a PQ type (hydrogenated) diblock copolymer containing 1% by mass or more, preferably 10% by mass or more, more preferably 20% by mass or more is selected as a component (C) described later, and mixed preferably.
- the upper limit of the content of the PQ type (hydrogenated) diblock copolymer contained in component (C) is not particularly limited, and is usually 100% by mass or less, preferably 90% by mass or less, more preferably 90% by mass or less. It is 80% by mass or less, more preferably 50% by mass or less.
- Component (A) Polyolefins of component (A) include polypropylene, polyethylene, poly-1-butene, ethylene/vinyl acetate copolymer, ethylene/(meth)acrylic acid copolymer, ethylene/(meth)acrylic acid ester copolymer, and the like. Ethylene-based copolymerization and the like can be mentioned, but polypropylene is preferably used because it is excellent in heat resistance, moldability, and the like.
- Polypropylene is a polyolefin in which the content of propylene units is more than 50% by mass with respect to the total monomer units.
- polypropylene is not particularly limited, and any propylene copolymer such as propylene homopolymer, propylene random copolymer, or propylene block copolymer can be used.
- polypropylene is a propylene random copolymer
- monomers to be copolymerized with propylene include ethylene, 1-butene, 2-methylpropylene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4 -methyl-1-pentene, 1-octene.
- the polypropylene when it is a propylene block copolymer, it may be a propylene block copolymer obtained by polymerization in multiple stages. More specifically, polypropylene is polymerized in the first stage, and propylene is polymerized in the second stage.
- a propylene block copolymer obtained by polymerizing an ethylene copolymer is mentioned.
- the content of propylene units in polypropylene is preferably 60% by mass or more, more preferably 75% by mass or more, and still more preferably 90% by mass or more.
- the propylene unit content is at least the above lower limit, the heat resistance and rigidity tend to be good.
- the upper limit of the content of propylene units in polypropylene is not particularly limited, and is usually 100% by mass.
- the content of propylene units in polypropylene can be determined by infrared spectroscopy.
- the weight average molecular weight of the component (A) polypropylene is preferably 270,000 or more, more preferably 300,000 or more, as a value measured by gel permeation chromatography (hereinafter sometimes abbreviated as GPC) and converted to polystyrene. Preferably, 320,000 or more is more preferable. On the other hand, from the viewpoint of surface smoothness, it is preferably 1,000,000 or less, more preferably 950,000 or less, and even more preferably 900,000 or less.
- the weight average molecular weight of the component (A) polypropylene is measured by the GPC method.
- An example of measurement conditions is shown below.
- melt flow rate of the component (A) polypropylene is not limited, but is usually 0.1 g / 10 minutes or more, and from the viewpoint of surface smoothness and moldability , preferably 0.5 g/10 minutes or more.
- the upper limit is usually 60 g/10 minutes or less, preferably 50 g/10 minutes or less, more preferably 40 g/10 minutes or less from the viewpoint of rubber elasticity.
- melt flow rate of component (A) polyolefin is measured according to JIS K7210 (1999) under conditions of a measurement temperature of 230°C and a measurement load of 21.18N.
- a polymerization method using a known olefin polymerization catalyst is used.
- a multi-stage polymerization method using a Ziegler-Natta catalyst can be mentioned.
- a slurry polymerization method, a solution polymerization method, a bulk polymerization method, a gas phase polymerization method, or the like can be used, and two or more of these methods may be combined for production.
- polypropylene can be procured from the manufacturers listed below, and can be selected as appropriate.
- Commercially available products include Novatec PP from Japan Polypropylene, Prime Polypro from Prime Polymer, Sumitomo Noblen from Sumitomo Chemical, polypropylene block copolymer from SunAllomer, LyondellBasell, Inc. Moplen (registered trademark) from ExxonMobil, ExxonMobil PP from Formosa Plastics, Formolene (registered trademark) from Borealis, Borealis PP from LG Chemical, SEETEC PP from LG Chemical, A.I.
- thermoplastic elastomer composition of the present invention may contain only one type of polyolefin such as polypropylene, or may contain two or more types of monomer units having different types, contents, physical properties, etc. may be
- Component (B) The ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber of component (B) is a copolymer containing ethylene, an ⁇ -olefin and a non-conjugated diene compound as copolymer components.
- Ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber includes a mixture of ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber and a softener for hydrocarbon rubber (hereinafter referred to as “oil-extended ethylene/ ⁇ - There is an oil-extended type that is sometimes referred to as "olefin/non-conjugated diene copolymer rubber") and a non-oil-extended type that does not contain a softener for hydrocarbon rubber.
- extended type copolymer rubbers are intended, low oil extended or non-oil extended types are also suitable.
- the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber of component (B) can be either oil-extended or non-oil-extended. Only one type of extended type may be used alone, or two or more types may be used in any combination and ratio, one or two or more oil-extended types and one or two non-oil-extended types More than one species can also be used in any combination and ratio.
- the component (B) is an oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber
- the softener for rubber is included in the softener for hydrocarbon rubber as the component (D).
- Examples of ⁇ -olefins in component (B) include propylene, 1-butene, 3-methyl-1-butene, 1-pentene, 4-methyl-1-pentene, 4,4-dimethyl-1-pentene, 1-
- Examples include ⁇ -olefins having 3 to 20 carbon atoms, more preferably 3 to 8 carbon atoms, such as hexene, 4-methyl-1-hexene, 1-heptene, 1-octene, 1-decene, and 1-octadecene, It is not particularly limited to these.
- propylene, 1-butene, 3-methyl-1-butene, and 1-pentene are preferable, and more preferably propylene and 1- is butene.
- the ⁇ -olefins can be used singly or in any combination and ratio of two or more.
- Non-conjugated diene compounds in component (B) include dicyclopentadiene, 1,4-hexadiene, cyclohexadiene, cyclooctadiene, dicyclooctadiene, 1,6-octadiene, 5-methyl-1,4- Hexadiene, 3,7-dimethyl-1,6-octadiene, 1,3-cyclopentadiene, 1,4-cyclohexadiene, 2-methyl-1,5-hexadiene, 6-methyl-1,5-heptadiene, 7- ethylidenenorbornenes such as methyl-1,6-octadiene, tetrahydroindene, methyltetrahydroindene, 5-isopropylidene-2-norbornene, 5-vinyl-2-norbornene, vinylidenenorbornene, 5-ethylidene-2-norbornene (ENB); Methylene norbornenes
- dicyclopentadiene, ethylidenenorbornene, and vinylidenenorbornene are preferable, and more preferably dicyclopentadiene, 5-ethylidene-2-norbornene, and vinylidenenorbornene from the viewpoint of crosslinkability with a crosslinking agent during dynamic crosslinking.
- the non-conjugated diene can be used singly or in any combination and ratio of two or more.
- ethylene/ ⁇ -olefin/nonconjugated diene copolymer rubber examples include ethylene/propylene/5-ethylidene-2-norbornene copolymer rubber, ethylene/propylene/dicyclopentadiene copolymer rubber, and ethylene/propylene.
- EPDM ethylene-propylene-nonconjugated diene copolymer rubber
- examples include, but are not limited to, 5-ethylidene-2-norbornene copolymer rubber.
- ethylene/propylene/non-conjugated diene copolymer rubber EPDM
- EPDM ethylene/propylene/non-conjugated diene copolymer rubber
- the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber can be used alone or in any combination and ratio of two or more.
- the content of ethylene units in the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber is not particularly limited, but is preferably 50 to 90% by mass, more preferably 55 to 85% by mass, and more preferably 60 to 80% by mass. More preferred.
- ethylene unit content is within the above preferred range, a thermoplastic elastomer composition having excellent mechanical strength and rubber elasticity tends to be easily obtained.
- the content of ⁇ -olefin units in the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber is not particularly limited, but is preferably 9.5 to 49.5% by mass, more preferably 14 to 44% by mass. Preferably, 18 to 38% by mass is more preferable.
- the content of the ⁇ -olefin unit is within the above preferable range, it tends to be easy to obtain a thermoplastic elastomer composition excellent in mechanical strength, moderate flexibility and rubber elasticity.
- the content of non-conjugated diene units in the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber is not particularly limited, but is preferably 0.5 to 30% by mass, more preferably 1 to 20% by mass. 2 to 10% by mass is more preferable.
- the content of the non-conjugated diene unit is within the above preferable range, it becomes easy to adjust crosslinkability and moldability, and a thermoplastic elastomer composition having excellent mechanical strength and rubber elasticity tends to be easily obtained.
- each structural unit of component (B) can be determined by infrared spectroscopy.
- the component (B) particularly has an ethylene unit content of 55 to 75% by mass, a propylene unit content of 15 to 40% by mass, dicyclopentadiene, 5-ethylidene-2 Ethylene/propylene/non-conjugated diene copolymer rubber having a content of 1 to 10% by mass of at least one non-conjugated diene unit selected from the group consisting of -norbornene and vinylidene-norbornene is preferred.
- a polymerization method using a known olefin polymerization catalyst can be applied.
- it can be produced by a slurry polymerization method, a solution polymerization method, a bulk polymerization method, or a gas phase polymerization method using a Ziegler-Natta catalyst, a complex catalyst such as a metallocene complex or a non-metallocene complex.
- a Ziegler-Natta catalyst is preferable.
- complex catalysts such as metallocene complexes and non-metallocene complexes
- those produced using Ziegler-Natta catalysts have relatively low regularity in the primary structure. Since the molecular mobility of is high, the surface smoothness tends to be good.
- non-oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubbers that is, non-oil-extended ethylene
- the Mooney viscosity (ML 1+4 , 125° C.) of ⁇ -olefin/non-conjugated diene copolymer rubber) is usually 45 or higher, preferably 50 or higher.
- the Mooney viscosity (ML 1+4 , 125° C.) of the non-oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer is more preferably 50-400, still more preferably 50-300.
- the Mooney viscosity (ML 1+4 , 125° C.) of the oil-extended ethylene/ ⁇ -olefin/conjugated diene copolymer rubber is not particularly limited, but is preferably 30-100, more preferably 35-80.
- the Mooney viscosity of the component (B) is at least the above lower limit, the compression set will be good, and it is also preferable from the viewpoint of improving the appearance of the resulting molded product. is preferable from the viewpoint of
- the Mooney viscosity (ML 1+4 , 125° C.) of the pre-oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer and the oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer of component (B) is The relationship is expressed by the following formula as described in Japanese Patent Application Laid-Open No. 1-103639.
- the density of the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber of component (B) is not particularly limited, but is preferably 0.850 g/cm 3 or more, more preferably 0.855 g/cm 3 or more. 3 or more, preferably 0.900 g/cm 3 or less, more preferably 0.890 g/cm 3 or less.
- the density of the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber of the component (B) is within the preferred numerical range, a thermoplastic elastomer composition having excellent processability, moldability, flexibility, etc. can be easily obtained. There is a tendency. Such density can be measured based on JIS K7112:1999.
- an oil-extended ethylene/ ⁇ -olefin/conjugated diene copolymer can also be used as the component (B).
- a hydrocarbon-based rubber softener softens the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber and increases its flexibility and elasticity. It is used for the purpose of improving the processability and fluidity of the resulting thermoplastic elastomer composition.
- Hydrocarbon-based rubber softeners used in oil-extended ethylene/ ⁇ -olefin/conjugated diene copolymer rubbers include, for example, mineral oil-based rubber softeners and synthetic resin-based rubber softeners. , and from the viewpoint of affinity with other components, a mineral oil-based rubber softener is preferred.
- Mineral oil-based rubber softeners are generally mixtures of aromatic hydrocarbons, naphthenic hydrocarbons and paraffinic hydrocarbons, with the proportion of carbon in paraffinic hydrocarbons being 50% of total carbon atoms. Those above are called paraffinic oils, naphthenic oils with a carbon ratio of 30 to 45% are called naphthenic oils, and aromatic hydrocarbons with a carbon ratio of 35% or more are called aromatic oils.
- paraffin-based rubber softeners are preferred as component (B) softeners for hydrocarbon-based rubbers of oil-extended ethylene/ ⁇ -olefin/conjugated diene copolymer rubbers.
- the softening agent for hydrocarbon rubber can be used individually by 1 type, or two or more types can be used by arbitrary combinations and ratios.
- the paraffin oil used in the oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber of component (B) is not particularly limited, but the kinematic viscosity at 40° C. is usually 20 cSt (centistokes) or more, preferably 50 cSt. It is 800 cSt or less, preferably 600 cSt or less. Further, the pour point is usually -40°C or higher, preferably -30°C or higher, and preferably 0°C or lower. Furthermore, the flash point (COC) is usually 200° C. or higher, preferably 250° C. or higher, and usually 400° C. or lower, preferably 350° C. or lower.
- the content ratio of the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber and the softener for hydrocarbon rubber when the oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber is used as the component (B). is not particularly limited, but the content of the softener for hydrocarbon rubber is usually 10 parts by mass or more, preferably 20 parts by mass, per 100 parts by mass of the ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber. parts or more, and on the other hand, it is usually 200 parts by mass or less, preferably 160 parts by mass or less, and more preferably 120 parts by mass or less.
- Oil-extended method The method of preparing the oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber (oil-extended method) is not particularly limited, and known methods can be used.
- Oil extension methods include, for example, a method of mechanically kneading an ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber and a softening agent for hydrocarbon rubber using a mixing roll or a Banbury mixer, followed by oil extension.
- a method of impregnating a mixture of a conjugated diene copolymer rubber and a softening agent for hydrocarbon-based rubber by stirring with a Henschel mixer or the like can be used.
- a polymerization reaction solution or suspension of the component (B) ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber A preferred method is to remove the solvent after adding a predetermined amount of softener for hydrocarbon rubber to the liquid.
- ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber of component (B) various grades are commercially available from domestic and overseas manufacturers, and these commercial products can be used.
- Commercially available products include, for example, JSR EPR manufactured by JSR, Mitsui EPT manufactured by Mitsui Chemicals, Esprene (registered trademark) manufactured by Sumitomo Chemical, Keltan (registered trademark) manufactured by ARLANXEO, NORDEL manufactured by DOW CHEMICAL ( registered trademark) and KEP manufactured by KUMHO POLYCHEM.
- Component (C) consists of a polymer block P mainly composed of aromatic vinyl compound units (hereinafter sometimes simply referred to as "block P") and a polymer block Q mainly composed of conjugated diene units (hereinafter simply A block copolymer containing a PQ type diblock copolymer having one polymer block P and one polymer block Q, which is sometimes referred to as "block Q”) It is a polymer and/or a hydrogenated product thereof (hereinafter sometimes referred to as a “(hydrogenated) block copolymer”).
- “mainly” means that the content of monomer units constituting the block is 50 mol% or more.
- the vinyl aromatic compound of the monomer constituting block P is not limited, styrene derivatives such as styrene, ⁇ -methylstyrene, and chloromethylstyrene are preferred. Among these, it is more preferable to use styrene as the main component.
- the block P may contain a monomer other than the vinyl aromatic compound as a raw material.
- the monomer constituting block Q is preferably butadiene alone, isoprene alone, or butadiene and isoprene.
- Block Q may contain monomers other than butadiene and isoprene as raw materials.
- the content of block P in the block copolymer of component (C) is not limited, but is preferably 5% by mass or more, more preferably 10% by mass or more. On the other hand, 50% by mass or less is preferable, and 45% by mass or less is more preferable.
- the chemical structure of the copolymer having block P and block Q in component (C) may be linear, branched, radial, etc., and is represented by the following formula (1) or (2). It is preferably a block copolymer.
- Component (C) may be a hydrogenated block copolymer having block P and block Q.
- the copolymer represented by the following formula (1) or (2) is a hydrogenated block copolymer, the thermoplastic resin elastomer of the present invention tends to have good heat aging resistance.
- P - (Q - P) m (1) (P-Q) n (2) (Wherein, P represents block P, Q represents block Q, m represents an integer of 1 to 5, and n represents an integer of 1 to 5.)
- m and n are preferably large in terms of lowering the order-disorder transition temperature of the rubber-like polymer, but small in terms of ease of production and cost. .
- thermoplastic elastomer composition of the present invention contains 0.05 to 2.0% by mass of the PQ type (hydrogenated) diblock copolymer based on the total 100% by mass of components (A) to (D). It is characterized by being In order to satisfy this requirement, the (hydrogenated) block copolymer of component (C) is usually a PQ type (hydrogenated) diblock copolymer represented by formula (2) where n is 1. From the viewpoint of surface smoothness, the content is preferably 1% by mass or more, preferably 10% by mass or more, and more preferably 20% by mass or more.
- the upper limit of the content of the PQ type (hydrogenated) diblock copolymer in the component (C) is not particularly limited and may be 100% by mass, but from the viewpoint of good rubber elasticity, it is 90% by mass. The following is preferable, 80% by mass or less is more preferable, and 50% by mass or less is even more preferable.
- Component (C) is represented by the above formula (1) or formula (2) other than the PQ type (hydrogenated) diblock copolymer and the PQ type (hydrogenated) diblock copolymer It may be a mixture of (hydrogenated) block copolymers. Copolymers other than the PQ-type (hydrogenated) diblock copolymer are superior in rubber elasticity, and therefore, the (hydrogenated) block copolymer represented by the formula (2) is expressed by the formula (1).
- the (hydrogenated) block copolymer represented by the formula (1) is more preferable, and the (hydrogenated) block copolymer represented by the formula (1) in which m is 3 or less is more preferable, and the formula in which m is 2 or less ( A (hydrogenated) block copolymer represented by 1) is more preferred.
- the number average molecular weight of the (hydrogenated) block copolymer of component (C) is not limited, it is preferably 20,000 or more as a polystyrene-equivalent value measured by gel permeation chromatography (GPC). 000 or more is more preferable. Also, it is preferably 500,000 or less, more preferably 400,000 or less. When the number average molecular weight is within the above range, flexibility and moldability tend to be good.
- the method for producing the block copolymer of component (C) is not particularly limited as long as the above-described structure and physical properties can be obtained.
- the block copolymer of component (C) can be produced, for example, by performing block polymerization in an inert solvent using a lithium catalyst or the like.
- a known method such as carrying out in an inert solvent in the presence of a hydrogenation catalyst can be employed.
- a commercially available product can be used as the (hydrogenated) block copolymer of component (C).
- Commercially available products include, for example, the "KRATON” series manufactured by Kraton Polymer Co., Ltd., the “Tuftec (registered trademark)” series manufactured by Asahi Kasei Chemicals, the “Septon (registered trademark)” series manufactured by Kuraray Co., Ltd., and the “TAIPOL” series manufactured by Taiwan Synthetic Rubber Co., Ltd. , LCY's "Globalprene” series, and applicable ones can be appropriately selected and used.
- component (C) Only one type of component (C) may be used, or two or more types having different copolymer component compositions, physical properties, etc. may be mixed and used.
- the thermoplastic elastomer composition of the present invention preferably contains a hydrocarbon-based rubber softener as component (D) from the viewpoint of increasing flexibility and elasticity and improving processability and fluidity.
- component (D) contains a softener for hydrocarbon rubber contained therein.
- the softener for hydrocarbon rubber to be separately attached is the same, the same kind, or different from the softener for hydrocarbon rubber in the oil-extended ethylene/ ⁇ -olefin/nonconjugated diene copolymer rubber of component (B). Any of the softeners for hydrocarbon rubber can be used. The same applies to the case where the component (E), the crosslinking agent, contains a softening agent for hydrocarbon rubber.
- the hydrocarbon-based rubber softener to be added separately from the component (B) the same hydrocarbon-based rubber softener used for the oil-extended ethylene/ ⁇ -olefin/conjugated diene copolymer rubber described above is used. be able to. Among these, paraffin-based rubber softeners (paraffin-based oils) are preferred.
- the hydrocarbon-based rubber softener can be used alone or in any combination and ratio of two or more.
- the paraffinic oil to be added separately from the component (B) is not particularly limited, but the kinematic viscosity at 40 ° C. is usually 10 cSt (centistokes) or more, preferably 20 cSt or more, and usually 800 cSt or less, preferably 600 cSt or less. It is. Further, the pour point is usually -40°C or higher, preferably -30°C or higher, and preferably 0°C or lower. The pour point is usually -40°C or higher, preferably -30°C or higher, and preferably 0°C or lower. Furthermore, the flash point (COC) is usually 200° C. or higher, preferably 210° C. or higher, and usually 400° C. or lower, preferably 350° C. or lower.
- COC flash point
- component (B) Even when an oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber is used as component (B), component ( Arbitrarily adjusting the content ratio of the softener for hydrocarbon rubber in D) without depending on the content ratio of the softener for hydrocarbon rubber in the oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber It is possible to
- component (D) softener for hydrocarbon rubber.
- component (D) softener for hydrocarbon rubber.
- examples of commercially available products of component (D) include "Nisseki Polybutene (registered trademark) HV” series manufactured by JX Nippon Oil & Energy Corporation and “Diana (registered trademark) Process Oil PW” series manufactured by Idemitsu Kosan Co., Ltd. It can be appropriately selected and used from among these.
- thermoplastic elastomer composition of the present invention contains a cross-linking agent containing a phenolic resin as component (E).
- the component (E) cross-linking agent partially cross-links the above-described component (B) in the resin composition during dynamic heat treatment, thereby realizing a dynamically cross-linkable thermoplastic elastomer composition. .
- cross-linking agent As such a cross-linking agent, it is possible to appropriately select and use it from known ones, for example, phenol resins, organic peroxides, silicon hydride compounds, polyfunctional vinyl compounds, polyfunctional (meth)acrylate compounds, and chlorides At least one selected from the group consisting of tin is preferred, and combinations of phenol resin and tin chloride, organic peroxide and polyfunctional vinyl compound or polyfunctional (meth)acrylate compound are more preferred. However, in the present invention, among these, phenol resin is used as an essential component. As the cross-linking agent, only one type of phenolic resin may be used alone, or two or more types of other cross-linking agents may be used together with the phenolic resin in an arbitrary combination and ratio.
- component (E) phenolic resin examples include alkylphenol formaldehyde, which is a non-halogenated phenolic resin, and brominated alkylphenololformaldehyde, which is a halogenated phenolic resin. These phenol resins may be used alone or in combination of two or more.
- non-halogenated phenolic resins are particularly preferred, and specifically, those represented by the following formula (I) are preferred.
- X is a divalent linking group —CH 2 — or —CH 2 —O—CH 2 —
- r is an integer of 0 to 20
- R is less than 20 carbon atoms, It is preferably an organic group having 1 to 12 carbon atoms.
- non-halogenated phenolic resin products examples include Tackirol 201 and 202 (trade name) manufactured by Taoka Chemical Co., Ltd., PR-4507 (trade name) manufactured by Gun Ei Chemical Industry Co., Ltd., Vulkaresat 510E, 532E, Vulkaresen E, 105E, 130E, Vulkaresol 315E (trade name), Amberol ST 137X (trade name) manufactured by Rohm & Haas, Sumilite Resin PR-22193 (trade name) manufactured by Sumitomo Durez Co., Ltd., Anchor Chem.
- Symphorm-C-100, C-1001 (trade name) manufactured by Arakawa Chemical Industries, Ltd., Tamanol 531 (trade name) manufactured by Schenectady Chem. Schenectady SP1045, SP1059 (trade name) manufactured by U.S.A. C. CRR-0803 (trade name) manufactured by Company C, CRM-0803 (trade name) manufactured by Showa Union Gosei Co., Ltd., and Vulkadur A (trade name) manufactured by Bayer.
- non-halogenated phenolic resin of component (E) p-octylphenol formaldehyde resin represented by the following formula (II) is particularly preferably used, and among them, those having a weight average molecular weight of 2,500 to 4,000 are most preferred. It is preferably used.
- a halogen-free phenolic resin those commercially available as Tackirol (registered trademark) 201 and 202 can be used.
- r is an integer from 0 to 20.
- organic peroxides of component (E) include aromatic organic peroxides and aliphatic organic peroxides. Specifically, di-t-butyl peroxide, t-butyl cumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl -2,5-di(t-butylperoxy)-3-hexyne, 1,3-bis(t-butylperoxyisopropyl)benzene, 1,1-di(t-butylperoxy)-3,3, Dialkyl peroxides such as 5-trimethylcyclohexane; t-butyl peroxybenzoate, t-butyl peroxyisopropyl carbonate, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, 2,5-dimethyl- Peroxy esters such as 2,5-di(benzoyl
- cross-linking agents may also be used.
- peroxides such as nitrosobenzene and 1,3-diphenylguanidine; polyfunctional vinyl compounds such as divinylbenzene, triallyl cyanurate, triallyl isocyanurate and diallyl phthalate; ethylene glycol di(meth)acrylate, diethylene glycol di
- Polyfunctional (meth)acrylate compounds such as (meth)acrylate, polyethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, allyl (meth)acrylate; N,N'-m-phenylenebismaleimide, N, Compounds having a bismaleimide structure such as N'-m-toluylenebismaleimide; trimethylolpropane, trimethylolpropane trimethacrylate, and tin chloride (SnCl 2 ).
- divinyl such as divinylbenzene, triallyl cyanurate, triallyl is
- the cross-linking agent can be used alone or in any combination and ratio of two or more.
- Phenolic resin crosslinkers are also commonly used with activators.
- Activators that can be used here include, for example, halogen donors such as stannous chloride, ferric chloride, chlorinated paraffin, chlorinated polyethylene, chlorosulfonated polyethylene, and iron oxide, titanium oxide, Acid acceptors such as magnesium oxide, silicon dioxide and zinc oxide are used.
- a halogen donor may not be used if the phenolic resin is halogenated.
- Some commercially available cross-linking agents include softeners for hydrocarbon rubbers corresponding to component (D) and fillers.
- the softening agent for hydrocarbon rubber is included in the softening agent for hydrocarbon rubber as the component (D).
- fillers which will be described later.
- a phenolic resin, particularly a non-halogenated phenolic resin, as component (E) is preferably used together with tin chloride such as stannous chloride as component (E).
- the ratio of the phenolic resin and tin chloride as the component (E) is 10 to 100 parts by weight, particularly 20 to 50 parts by weight of tin chloride per 100 parts by weight of the phenolic resin. It is preferable from the viewpoint of effect and good rubber elasticity.
- the content of component (A) is preferably 1% by mass or more and less than 50% by mass with respect to the total 100% by mass of components (A) and (B). , 3% by mass or more and 45% by mass or less.
- the content of component (A) is at least the above lower limit, moldability and rubber elasticity at high temperatures are favorable, which is preferable. Flexibility is favorable in content rate of a component (A) being below the said upper limit, and it is preferable.
- the thermoplastic elastomer composition of the present invention contains 0.05 to 2.0% by mass of the PQ type (hydrogenated) diblock copolymer with respect to 100% by mass of the total of components (A) to (E). It is characterized by being Therefore, if the content of the component (C) in the thermoplastic elastomer composition of the present invention satisfies this condition according to the content of the PQ type (hydrogenated) diblock copolymer, good.
- the content of component (C) is preferably 0.1 parts by mass or more with respect to a total of 100 parts by mass of components (A) and (B).
- the content of the component (C) is at least the above lower limit, the surface smoothness is favorable, which is preferable.
- the content of component (C) is preferably 400 parts by mass or less, more preferably 200 parts by mass or less, and 100 parts by mass or less with respect to a total of 100 parts by mass of components (A) and (B). is more preferable, and particularly preferably 50 parts by mass or less. It is preferable that the content of the component (A) is equal to or less than the above upper limit because high-temperature rubber elasticity is good.
- the thermoplastic elastomer composition of the present invention preferably contains 50 parts by mass or more and 300 parts by mass or less of component (D) with respect to a total of 100 parts by mass of components (A) and (B). more preferably 250 parts by mass or less.
- component (D) is at least the above lower limit, the moldability and rubber elasticity are good, which is preferable.
- the content of the component (D) is equal to or less than the above upper limit, the oil bleed resistance is good, which is preferable.
- the content of component (D) refers to the hydrocarbon rubber in component (B) when an oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber is used as component (B).
- component (B) is the total content of the softener for hydrocarbon rubber as component (D) separately added, and the softener for hydrocarbon rubber is included in component (E) described later. When an agent is included, it is the total content including the softener for hydrocarbon rubber.
- the thermoplastic elastomer composition of the present invention preferably contains 0.5 parts by mass or more and 10 parts by mass or less of component (E) with respect to a total of 100 parts by mass of components (A) and (B).
- the content of component (E) is at least the above lower limit, the rubber elasticity is good, which is preferable. It is preferable that the content of component (E) is equal to or less than the above upper limit because moldability is good.
- the thermoplastic elastomer composition of the present invention contains 1 part by mass or more and 10 parts by mass of a phenol resin as component (E) with respect to a total of 100 parts by mass of component (A) and component (B). It is preferable to contain the following. When the content of the phenolic resin is at least the above lower limit, the rubber elasticity is good, which is preferable. When the content of the phenolic resin is equal to or less than the above upper limit, moldability is good, which is preferable.
- thermoplastic elastomer composition of the present invention may optionally contain other components within a range that does not impair the effects of the present invention.
- components include, for example, resins such as thermoplastic resins and elastomers other than components (A) to (C), antioxidants, fillers, heat stabilizers, light stabilizers, ultraviolet absorbers, neutralizers, Lubricants, anti-fog agents, anti-blocking agents, slip agents, dispersants, colorants, flame retardants, antistatic agents, conductivity imparting agents, metal deactivators, molecular weight modifiers, antibacterial agents, antifungal agents, fluorescence Various additives such as brighteners can be mentioned. Any of these can be used alone or in combination.
- resins such as thermoplastic resins and elastomers other than components (A) to (C)
- antioxidants fillers, heat stabilizers, light stabilizers, ultraviolet absorbers, neutralizers, Lubricants, anti-fog agents, anti-blocking agents, slip agents, dispersants, colorants, flame retardants, antistatic agents, conductivity imparting agents, metal deactivators, molecular weight modifiers, antibacterial agents, antifungal
- Thermoplastic resins other than components (A) to (C) include, for example, polyphenylene ether resins; polyamide resins such as nylon 6 and nylon 66; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; Polymers, polyoxymethylene resins such as polyoxymethylene copolymers; polymethyl methacrylate resins and polyolefin resins (excluding those corresponding to component (A) or component (B)).
- Examples of elastomers other than components (A) to (C) include polyester-based elastomers; polybutadiene.
- antioxidants examples include phenol-based antioxidants, phosphite-based antioxidants, and thioether-based antioxidants. When an antioxidant is used, it is usually used in the range of 0.01 to 3.0 parts by mass per 100 parts by mass of component (A) and component (B).
- fillers examples include glass fiber, hollow glass spheres, carbon fiber, talc, calcium carbonate, clay, mica, potassium titanate fiber, silica, metallic soap, titanium dioxide, and carbon black. When a filler is used, it is usually used in an amount of 0.1 to 50 parts by mass per 100 parts by mass of components (A) and (B) combined.
- lubricants examples include fatty acid amides, fatty acid metal salts, and organopolysiloxanes. When a lubricant is used, it is usually used in the range of 0.01 to 5.0 parts by mass per 100 parts by mass of component (A) and component (B).
- thermoplastic elastomer composition of the present invention contains component (A), component (B), component (C), component (D), and other components used as necessary in predetermined amounts.
- the composition is preferably prepared by dynamic heat treatment in the presence of a cross-linking agent comprising component (E), a phenolic resin.
- melt-kneading in a molten or semi-molten state in the presence of a cross-linking agent.
- This dynamic heat treatment is preferably carried out by melt-kneading, and examples of the melt-kneading apparatus used for this purpose include closed Banbury mixers, mixing rolls, kneaders, and twin-screw extruders. Among these, it is preferable to use a twin-screw extruder.
- a preferred embodiment of this production method using a twin-screw extruder is to supply each component to a raw material supply port (hopper) of a twin-screw extruder having a plurality of raw material supply ports and perform dynamic heat treatment.
- the temperature for the dynamic heat treatment is usually 80-300°C, preferably 100-250°C.
- the time for dynamic heat treatment is usually 0.1 to 30 minutes.
- thermoplastic elastomer composition of the present invention is produced by dynamic heat treatment using a twin-screw extruder, the barrel radius (R (mm)) of the twin-screw extruder and the screw rotation speed (N (rpm)) and the discharge amount (Q (kg/hour)), it is preferable to extrude while maintaining the relationship of the following formula (i), more preferably while maintaining the relationship of the following formula (ii). 2.6 ⁇ NQ/R3 ⁇ 22.6 ( i) 3.0 ⁇ NQ/R3 ⁇ 20.0 (ii)
- thermoplastic that the relationship between the barrel radius (R (mm)) of the twin-screw extruder, the screw rotation speed (N (rpm)) and the discharge rate (Q (kg / hour)) is greater than the above lower limit It is preferred for efficient production of the elastomer composition. On the other hand, it is preferable that the above relationship is smaller than the above upper limit in order to suppress heat generation due to shearing and to suppress the generation of foreign matter that causes poor appearance.
- the component (B) ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber is added to at least a part of the component (D) softener for hydrocarbon rubber.
- the component (B) can also be used as an oil-extended ethylene/ ⁇ -olefin/non-conjugated diene copolymer rubber.
- the duro hardness A (value after 15 seconds) measured in accordance with JIS K6253 (2006 version) (Duro-A) is It is preferably 95 or less, more preferably 90 or less, and particularly preferably 85 or less, because the elasticity tends to be well controlled. On the other hand, it is preferably 20 or more, more preferably 25 or more, and particularly preferably 45 or more, because there is a tendency to control the surface smoothness well. From the viewpoint of achieving both rubber elasticity at high temperatures and surface smoothness, the duro hardness A (value after 15 seconds) is preferably 45 to 90, 45 to 85.
- thermoplastic elastomer composition of the present invention can be formed into a molded article by a molding method commonly used for thermoplastic elastomer compositions, such as injection molding, extrusion molding, blow molding, compression molding, and the like. Among these, injection molding and extrusion molding are preferred. In addition, it is also possible to obtain a molded body by performing secondary processing such as lamination molding and thermoforming after performing these moldings.
- thermoplastic elastomer composition of the present invention is excellent in surface smoothness and rubber elasticity at high temperatures, and is used in the automobile field (seal, cushion, boot, etc.), construction field (gasket, packing, etc.), miscellaneous goods field, sporting goods. (golf clubs, tennis racket grips, etc.), industrial parts (hose tubes, gaskets, etc.), home appliance parts (hoses, packings, etc.), medical parts (medical containers, gaskets, packings, etc.), food parts (containers, packings, etc.), parts for medical equipment, electric wire covering materials, and miscellaneous goods.
- molded articles made of the thermoplastic elastomer composition of the present invention are preferably used for automobile seals that require good appearance, various sealing materials, boots, packings, and gaskets that require sealing properties.
- Component (A)] (A-1): Propylene homopolymer/Novatec (registered trademark) PP FY6 manufactured by Japan Polypropylene Corporation Propylene unit content: 100% by mass MFR (230°C, 21.18N): 2.5 g/10 minutes Weight average molecular weight: 520,000 (A-2): Propylene homopolymer/Novatec (registered trademark) PP MA3 manufactured by Japan Polypropylene Corporation Propylene unit content: 100% by mass MFR (230°C, 21.18N): 11 g/10 minutes Weight average molecular weight: 360,000
- Component (B)] (B-1)+(D) mixture oil-extended ethylene/propylene/5-ethylidene-2-norbornene copolymer rubber (mixture of 100 parts by mass of component (B-1) and 40 parts by mass of component (D))/ 3072EPM manufactured by Mitsui Chemicals, Inc.
- (C-1) Hydrogenated block copolymer of aromatic vinyl compound and conjugated diene compound/KRATON G1657 manufactured by Kraton Polymer Co., Ltd. Styrene block P content: 13% by mass Number average molecular weight: 76,500 PQ type hydrogenated diblock copolymer content: 29% by mass
- (C'-1) Hydrogenated block copolymer of aromatic vinyl compound and conjugated diene compound/KRATON G1651 manufactured by Kraton Polymer Co., Ltd. Styrene block P content: 33% by mass Number average molecular weight: 220,000 PQ type hydrogenated diblock copolymer content: less than 1% by mass
- Component (G)] (G-1): Antioxidant / Irganox (registered trademark) 1076 manufactured by BASF Japan Co., Ltd.
- thermoplastic elastomer compositions in the following examples and comparative examples are as follows.
- each thermoplastic elastomer composition was used with an in-line screw type injection molding machine ("IS130" manufactured by Toshiba Machine Co., Ltd.) at an injection pressure of 50 MPa and a cylinder temperature of 220. C. and a mold temperature of 40.degree.
- the obtained sheet was punched out according to JIS K6262. was prepared and measured using this test piece.
- Kraft tape No. manufactured by Okamoto Co., Ltd. was used.
- Duro hardness A The hardness (after 15 seconds) was measured with reference to JIS K6253 (Duro-A).
- Peel strength Peel strength was measured under the conditions of a peel angle of 180 degrees and a peel speed of 100 mm/min. It was judged that the higher the peel strength, the better the surface smoothness.
- Example 1 to 5 and Comparative Examples 1 to 6 the surface smoothness was evaluated by the surface roughness of (4).
- the peel strength of (3) was used to evaluate the surface smoothness.
- thermoplastic elastomer composition The remaining components (E-1) + (D-2) mixture 8.5 parts by mass (component (E-1): 2.5 parts by mass, (D-2): 6 parts by mass) and (D-1 ) 43 parts by mass are each supplied from a supply port in the middle of the extruder by a liquid addition pump, and the temperature is raised from the upstream part to the downstream part in the range of 140 to 200 ° C. at a total discharge rate of 25 kg / h to melt and knead. and pelletized to produce a thermoplastic elastomer composition.
- the evaluations (1), (2) and (4) above were carried out on the obtained thermoplastic elastomer composition. The obtained evaluation results are shown in Table-1.
- Examples 2 to 4 and Comparative Examples 1 to 3 As shown in Table 1, in the same manner as in Example 1, except that the blending composition of components (A) to (E) (component (C') instead of component (C) in Comparative Example 3) was changed. Pellets of a thermoplastic elastomer composition were obtained. Evaluation similar to Example 1 was implemented using the obtained thermoplastic elastomer composition. The obtained evaluation results are shown in Table-1.
- Example 5 and Comparative Examples 4 to 6> As shown in Table 2, in the same manner as in Example 1, except that the blending composition of components (A) to (E) (component (C') instead of component (C) in Comparative Example 6) was changed. Pellets of a thermoplastic elastomer composition were obtained. Evaluation similar to Example 1 was implemented using the obtained thermoplastic elastomer composition. The obtained evaluation results are shown in Table-2.
- Example 6 and Comparative Examples 7 to 9> heat was applied in the same manner as in Example 1, except that the (B-2) + (D-1) mixture was used instead of the (B-1) + (D) mixture. Pellets of a plastic elastomer composition were obtained. The evaluations (1) to (3) were carried out using the obtained thermoplastic elastomer composition. The obtained evaluation results are shown in Table-3.
- thermoplastic resins were prepared in the same manner as in Example 1, except that the (B-2) + (D-1) mixture was used instead of the (B-1) + (D) mixture.
- a pellet of the elastomer composition was obtained.
- the evaluations (1) to (3) were carried out using the obtained thermoplastic elastomer composition. The obtained evaluation results are shown in Table-4.
- thermoplastic elastomer was prepared in the same manner as in Example 1 except that the (B-2) + (D-1) mixture was used instead of the (B-1) + (D) mixture. A pellet of the composition was obtained. The evaluations (1) to (3) were carried out using the obtained thermoplastic elastomer composition. The obtained evaluation results are shown in Table-5.
- Comparative Examples 1, 4, 7, 10, 13, and 14 are examples that do not contain a PQ type (hydrogenated) diblock copolymer. Nos. 7, 10, 13 and 14 were inferior in peel strength and inferior in surface smoothness. Comparative Examples 2, 5, 8, and 11 are examples in which the content of the PQ type (hydrogenated) diblock copolymer is 2.6% by mass, but the compression set is large and the rubber elasticity at high temperatures is low. was inferior. Comparative Examples 3, 6, 9, and 12 used the component (C'-1) instead of the component (C-1) in the examples, and added 0.04 of the PQ type (hydrogenated) diblock copolymer.
- Comparative Examples 3 and 6 were inferior in surface roughness
- Comparative Examples 9 and 12 were inferior in peel strength, and inferior in surface smoothness.
- the PQP type (hydrogenated) triblock copolymer which is a component other than the PQ type (hydrogenated) diblock copolymer contained in the component (C)
- the PQ type (hydrogenated) diblock copolymer does not form aggregates even on the surface of the molded product.
- Comparative Examples 3, 6, 9 and 12 since the content of the PQ type (hydrogenated) diblock copolymer is small, the PQ type (hydrogenated) diblock copolymer It is presumed that the surface smoothness deteriorated because the proportion of the polymer blocks Q deposited on the surface decreased compared to the examples.
- thermoplastic elastomer composition of the present invention is excellent in rubber elasticity and surface smoothness at high temperatures.
- the thermoplastic elastomer composition of the present invention has excellent high-temperature rubber elasticity and surface smoothness. , various sealing materials, boots, packings, and gaskets that require sealing performance.
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Abstract
Description
成分(A):ポリオレフィン
成分(B):エチレン・α-オレフィン・非共役ジエン共重合体ゴム
成分(C):芳香族ビニル化合物単位を主体とする重合体ブロックPと共役ジエン単位を主体とする重合体ブロックQとを有するブロック共重合体であって、重合体ブロックPと重合体ブロックQとを各々1個ずつ有するP-Q型ジブロック共重合体を含むブロック共重合体及び/又はその水素添加物
成分(D):炭化水素系ゴム用軟化剤
成分(E):フェノール樹脂を含む架橋剤
[4] JIS K6253(2006年度版)におけるデュロ硬度Aが90以下である、[3]に記載の熱可塑性エラストマー組成物。
[5] JIS K6253(2006年度版)におけるデュロ硬度Aが45以上95以下である、[1]又は[2]に記載の熱可塑性エラストマー組成物。
[6] JIS K6253(2006年度版)におけるデュロ硬度Aが45以上85以下である、[5]に記載の熱可塑性エラストマー組成物。
[9] 前記成分(A)と(B)の合計100質量部に対して、前記成分(C)を0.1質量部以上400質量部以下含む、[1]~[8]のいずれか1つに記載の熱可塑性エラストマー組成物。
一実施形態において、本発明の熱可塑性エラストマー組成物は、下記成分(A)~(E)の合計100質量%に対し、P-Q型ジブロック共重合体及び/又はその水素添加物が0.05~2.0質量%含まれていることを特徴とする熱可塑性エラストマー組成物である。
成分(A):ポリオレフィン
成分(B):エチレン・α-オレフィン・非共役ジエン共重合体ゴム
成分(C):芳香族ビニル化合物単位を主体とする重合体ブロックPと共役ジエン単位を主体とする重合体ブロックQとを有するブロック共重合体であって、重合体ブロックPと重合体ブロックQとを各々1個ずつ有するP-Q型ジブロック共重合体を含むブロック共重合体及び/又はその水素添加物
成分(D):炭化水素系ゴム用軟化剤
成分(E):フェノール樹脂を含む架橋剤
成分(A):ポリオレフィン
成分(B):エチレン・α-オレフィン・非共役ジエン共重合体ゴム
成分(C):芳香族ビニル化合物単位を主体とする重合体ブロックPと共役ジエン単位を主体とする重合体ブロックQとを有するブロック共重合体であって、重合体ブロックPと重合体ブロックQとを各々1個ずつ有するP-Q型ジブロック共重合体を含むブロック共重合体及び/又はその水素添加物
成分(D):炭化水素系ゴム用軟化剤
以下において、「成分(A)~(E)の合計100質量%」は、成分(E)を含まない場合は、「成分(A)~(D)の合計100質量%」に該当する。
本発明の熱可塑性エラストマー組成物における成分(A)~(E)の合計100質量%に対するP-Q型ジブロック共重合体及び/又はその水素添加物(以下、「P-Q型(水添)ジブロック共重合体」と称す場合がある)の含有率は0.05~2.0質量%である。本発明の熱可塑性エラストマー組成物がP-Q型(水添)ジブロック共重合体を上記割合で含有することで表面平滑性と高温でのゴム弾性を両立できる。
表面平滑性発現のメカニズムは、P-Q-P型と比較して、P-Q型(水添)ジブロック共重合体は、重合体ブロックQの分子運動性が高いことから成形体表面に析出しやすく、成分(B)の凝集により形成される表面の凸凹を埋めるように作用し、表面の凸凹が均され、表面平滑性が向上したと推測する。
P-Q型(水添)ジブロック共重合体の含有割合の下限は、表面平滑性向上の観点から0.05質量%以上が好ましく、0.1質量%以上がより好ましく、0.2質量%以上が更に好ましい。一方、その上限は高温でのゴム弾性を維持する観点から2.0質量%以下が好ましく、1.8質量%以下がより好ましい。
成分(A)のポリオレフィンとしては、ポリプロピレン、ポリエチレン、ポリ1-ブテン、エチレン・酢酸ビニル共重合体、エチレン・(メタ)アクリル酸共重合体、エチレン・(メタ)アクリル酸エステル共重合体等のエチレン系共重合等が挙げられるが、耐熱性、成形加工性等に優れることから、ポリプロピレンが好適に用いられる。
(1)装置:東ソー製 HLC-8321 GPC/HT
(2)分離カラム:TSKgel GMHHR-H(20)HT 3本
(3)測定温度:140℃
(4)キャリア:1,2,4-トリクロロベンゼン
(5)流速:1.0mL/分
(6)試料濃度:1mg/mL
(7)試料注入量:300μL
(8)検出器:示差屈折
(9)分子量標準物質:標準ポリスチレン
成分(B)のエチレン・α-オレフィン・非共役ジエン共重合体ゴムは、共重合成分としてエチレンとα-オレフィンと非共役ジエン化合物とを含有する共重合体である。エチレン・α-オレフィン・非共役ジエン共重合体ゴムには、エチレン・α-オレフィン・非共役ジエン共重合体ゴムと炭化水素系ゴム用軟化剤との混合物(以下、「油展エチレン・α-オレフィン・非共役ジエン共重合体ゴム」と称することもある。)である油展タイプのものと、炭化水素系ゴム用軟化剤を含まない非油展タイプのものがあり、本実施形態では油展タイプの共重合体ゴムを意図しているが、低油展タイプあるいは非油展タイプのものも好適に用いることができる。すなわち、本発明において、成分(B)のエチレン・α-オレフィン・非共役ジエン共重合体ゴムは、油展タイプと非油展タイプのいずれでも使用可能であり、非油展タイプのもの又は油展タイプのものの1種類のみを単独で用いてもよく、2種類以上を任意の組み合わせ及び比率で用いてもよく、油展タイプの1種又は2種以上と非油展タイプの1種又は2種以上とを任意の組み合わせ及び比率で用いることもできる。
なお、ここで、成分(B)が油展エチレン・α-オレフィン・非共役ジエン共重合体ゴムである場合、この油展エチレン・α-オレフィン・非共役ジエン共重合体ゴムに含まれる炭化水素系ゴム用軟化剤は、成分(D)としての炭化水素系ゴム用軟化剤に含まれるものである。
一方、油展エチレン・α-オレフィン・共役ジエン共重合体ゴムのムーニー粘度(ML1+4、125℃)は、特に限定されないが、好ましくは30~100、より好ましくは35~80である。成分(B)のムーニー粘度が上記下限値以上であると圧縮永久歪みが良好となり、また、得られる成形体の外観を良好にする観点からも好ましく、また、上記上限値以下であると成形性の観点から好ましい。
計算式:log(ML1/ML2)=0.0066(ΔPHR)
ML1:油展前エチレン・α-オレフィン・非共役ジエン共重合体ゴムのムーニー粘度
ML2:油展エチレン・α-オレフィン・非共役ジエン共重合体ゴムのムーニー粘度
ΔPHR:エチレン・α-オレフィン・非共役ジエン共重合体ゴム100質量部当たりの油展量
成分(C)は、芳香族ビニル化合物単位を主体とする重合体ブロックP(以下、単に「ブロックP」と称す場合がある)と、共役ジエン単位を主体とする重合体ブロックQ(以下、単に「ブロックQ」と称す場合がある)とを有するブロック共重合体であって、重合体ブロックPと重合体ブロックQとを各々1個ずつ有するP-Q型ジブロック共重合体を含むブロック共重合体及び/又はその水素添加物(以下、「(水添)ブロック共重合体」と称す場合がある)である。
ここで「主体とする」とは、当該ブロックを構成する単量体単位の含有率が50モル%以上であることを意味する。
成分(C)はブロックPとブロックQとを有するブロック共重合体の水素添加物であってもよい。下記式(1)又は(2)で表される共重合体が水添ブロック共重合体であると、本発明の熱可塑性樹脂エラストマーの耐熱老化性が良好となる傾向にある。
P-(Q-P)m (1)
(P-Q)n (2)
(式中、PはブロックPを、QはブロックQをそれぞれ表し、mは1~5の整数を表し、nは1~5の整数を表す。)
この要件を満たすために成分(C)の(水添)ブロック共重合体には、nが1である式(2)で表されるP-Q型(水添)ジブロック共重合体が通常1質量%以上、好ましくは10質量%以上、より好ましくは20質量%以上含まれることが表面平滑性の観点から好ましい。成分(C)におけるP-Q型(水添)ジブロック共重合体の含有率の上限については特に限定されず100質量%であってもよいが、ゴム弾性が良好となる観点から90質量%以下が好ましく、80質量%以下がより好ましく、50質量%以下が更に好ましい。
本発明の熱可塑性エラストマー組成物は、柔軟性や弾性を増加させるとともに、加工性や流動性を向上させる観点から、成分(D)として炭化水素系ゴム用軟化剤を含有することが好ましい。なお、この成分(D)には、上述した成分(B)として油展エチレン・α-オレフィン・非共役ジエン共重合体ゴムを使用する際、その中に含まれる炭化水素系ゴム用軟化剤が含まれるが、成分(B)として油展エチレン・α-オレフィン・非共役ジエン共重合体ゴムを用いる場合も、この油展エチレン・α-オレフィン・非共役ジエン共重合体ゴムとは別に成分(D)として炭化水素系ゴム用軟化剤を別添することが好ましい。この場合、別添する炭化水素系ゴム用軟化剤は、成分(B)の油展エチレン・α-オレフィン・非共役ジエン共重合体ゴム中の炭化水素系ゴム用軟化剤と同一、同種、異種の炭化水素系ゴム用軟化剤のいずれでも用いることができる。成分(E)の架橋剤に炭化水素系ゴム用軟化剤が含まれる場合についても同様である。
本発明の熱可塑性エラストマー組成物は、成分(E)としてフェノール樹脂を含む架橋剤を含有する。
成分(E)の架橋剤は、動的熱処理において、樹脂組成物中で上述した成分(B)を部分的に架橋するものであり、これにより動的架橋型熱可塑性エラストマー組成物が実現される。かかる架橋剤としては、公知のものの中から適宜選択して用いることができ、例えば、フェノール樹脂、有機過酸化物、水素化ケイ素化合物、多官能ビニル化合物、多官能(メタ)アクリレート化合物、及び塩化スズよりなる群から選択される少なくとも1種が好ましいものとして挙げられ、フェノール樹脂と塩化スズ、有機過酸化物と多官能ビニル化合物又は多官能(メタ)アクリレート化合物の組み合わせがより好ましいものとして挙げられるが、本発明においては、このうち、フェノール樹脂を必須成分として用いる。なお、架橋剤は、フェノール樹脂1種のみを単独で用いてもよく、又はフェノール樹脂と共に他の架橋剤の2種類以上を任意組み合わせ及び比率で用いることができる。
この場合、成分(E)としてのフェノール樹脂と塩化スズの割合は、フェノール樹脂100質量部に対して塩化スズ10~100質量部、特に20~50質量部であることが、フェノール樹脂の活性化効果と、良ゴム弾性の観点から好ましい。
本発明の熱可塑性エラストマー組成物は、成分(A)と成分(B)との合計100質量%に対して、成分(A)の含有率が1質量%以上50質量%未満であることが好ましく、3質量%以上45質量%以下であることがより好ましい。成分(A)の含有率が上記下限以上であると、成形性と高温におけるゴム弾性が良好であり好ましい。成分(A)の含有率が上記上限以下であると、柔軟性が良好であり好ましい。
具体的には、成分(C)の含有量は、成分(A)と成分(B)との合計100質量部に対して、0.1質量部以上が好ましい。成分(C)の含有量が上記下限以上であると、表面平滑性が良好であり好ましい。一方で、成分(C)の含有量は、成分(A)と成分(B)との合計100質量部に対して、400質量部以下が好ましく、200質量部以下がより好ましく、100質量部以下が更に好ましく、特に好ましくは50質量部以下である。成分(A)の含有量が上記上限以下であると、高温ゴム弾性が良好であり好ましい。
なお、ここで、成分(D)の含有量とは、成分(B)として油展エチレン・α-オレフィン・非共役ジエン共重合体ゴムを用いた場合、成分(B)中の炭化水素系ゴム用軟化剤と、成分(B)とは別添される成分(D)としての炭化水素系ゴム用軟化剤との合計の含有量であり、後述の成分(E)に炭化水素系ゴム用軟化剤が含まれる場合は、当該炭化水素系ゴム用軟化剤をも含む合計の含有量である。
同様の観点から、本発明の熱可塑性エラストマー組成物は、成分(A)と成分(B)との合計100質量部に対して、成分(E)としてのフェノール樹脂を1質量部以上10質量部以下含有ことが好ましい。フェノール樹脂の含有量が上記下限以上であると、ゴム弾性が良好であり好ましい。フェノール樹脂の含有量が上記上限以下であると、成形性が良好であり好ましい。
本発明の熱可塑性エラストマー組成物には、成分(A)~(E)以外に本発明の効果を損なわない範囲で、必要に応じてその他の成分を配合することができる。
本発明の熱可塑性エラストマー組成物は、前述の通り、成分(A)、成分(B)、成分(C)及び成分(D)と、必要に応じて用いられるその他の成分等を所定量含有する組成物を好ましくは成分(E)であるフェノール樹脂を含む架橋剤の存在下で動的熱処理して製造される。
2.6<NQ/R3<22.6 (i)
3.0<NQ/R3<20.0 (ii)
本発明の熱可塑性エラストマー組成物を成形してなる成形体について、JIS K6253(2006年度版)(Duro-A)に準拠して測定したデュロ硬度A(15秒後値)は、高温でのゴム弾性を良好に制御しやすい傾向があることから、95以下であることが好ましく、90以下であることがより好ましく、85以下であることが特に好ましい。一方表面平滑性を良好に制御しやすい傾向があることから20以上であることが好ましく、25以上であることがより好ましく、45以上であることが特に好ましい。
高温でのゴム弾性と表面平滑性の両立の観点から、上記デュロ硬度A(15秒後値)は、45~90、45~85とすることが好ましい。
本発明の熱可塑性エラストマー組成物は、通常熱可塑性エラストマー組成物に用いられる成形方法、例えば、射出成形、押出成形、中空成形、圧縮成形等の各種成形方法により、成形体とすることができる。これらの中でも射出成形、押出成形が好適である。また、これらの成形を行った後に積層成形、熱成形等の二次加工を行った成形体とすることもできる。
以下の実施例・比較例で使用した原材料は以下の通りである。
(A-1):プロピレン単独重合体/日本ポリプロ株式会社製 ノバテック(登録商標)PP FY6
プロピレン単位含有率:100質量%
MFR(230℃、21.18N):2.5g/10分
重量平均分子量:520,000
(A-2):プロピレン単独重合体/日本ポリプロ株式会社製 ノバテック(登録商標)PP MA3
プロピレン単位含有率:100質量%
MFR(230℃、21.18N):11g/10分
重量平均分子量:360,000
(B-1)+(D)混合物:油展エチレン・プロピレン・5-エチリデン-2-ノルボルネン共重合体ゴム(成分(B-1)100質量部と成分(D)40質量部の混合物)/三井化学株式会社製 3072EPM
ムーニー粘度ML1+4(125℃):51
(B-1):エチレン・プロピレン・5-エチリデン-2-ノルボルネン共重合体
ムーニー粘度ML1+4(125℃):94
エチレン単位含有率:64質量%
5-エチリデン-2-ノルボルネン単位含有率:5.4質量%
密度:0.88g/cm3
重合触媒:メタロセン触媒
(B-2)+(D-1)混合物:油展エチレン・プロピレン・5-エチリデン-2-ノルボルネン共重合体ゴム(成分(B-2)100質量部と成分(D-1)100質量部の混合物)
ムーニー粘度ML1+4(125℃):64
密度:0.86g/cm3
(B-2):エチレン・プロピレン・5-エチリデン-2-ノルボルネン共重合体
ムーニー粘度ML1+4(125℃):293
エチレン単位含有率:67質量%
5-エチリデン-2-ノルボルネン単位含有率:4.5質量%
重合触媒:チーグラー・ナッタ触媒
(D-1):パラフィン系オイル/出光興産株式会社製
ダイアナ(登録商標)プロセスオイル PW-90
40℃の動粘度:95.54cSt
流動点:-15℃
引火点:272℃
(C-1):芳香族ビニル化合物と共役ジエン化合物との水添ブロック共重合体/クレイトンポリマー社製 KRATON G1657
スチレンブロックP含有率:13質量%
数平均分子量:76,500
P-Q型水添ジブロック共重合体含有率:29質量%
(C’-1):芳香族ビニル化合物と共役ジエン化合物との水添ブロック共重合体/クレイトンポリマー社製 KRATON G1651
スチレンブロックP含有率:33質量%
数平均分子量:220,000
P-Q型水添ジブロック共重合体含有率:1質量%未満
(D-1):パラフィン系オイル/出光興産株式会社製 ダイアナ(登録商標)プロセスオイル PW-90
40℃の動粘度:95.54cSt
流動点:-15℃
引火点:272℃
(D-2):パラフィン系オイル/出光興産株式会社製 ダイアナ(登録商標)プロセスオイル PW-32
40℃の動粘度:30.60cSt
流動点:-17.5℃
引火点:222℃
(E-1)+(D-2)混合物:フェノール樹脂(成分(E-1)30質量部と成分(D-2)70質量部の混合物
(E-1):両末端がメチロール基であるアルキルフェノールホルムアルデヒド樹脂/田岡化学工業株式会社製 Tackirol(登録商標)201
(D-2):パラフィン系オイル/出光興産株式会社製 ダイアナ(登録商標)プロセスオイル PW-32
40℃の動粘度:30.60cSt
流動点:-17.5℃
引火点:222℃
(E-2):塩化第一スズ/富士フイルム和光純薬工業株式会社製
(F-1):充填材/竹原化学工業株式会社製 タルク PHSH
(G-1):酸化防止剤/BASFジャパン株式会社製 イルガノックス(登録商標)1076
(H-1):受酸剤/富士フイルム和光純薬工業株式会社製 酸化亜鉛
以下の実施例・比較例における熱可塑性エラストマー組成物の評価方法は以下の通りである。
なお、下記(1)~(3)の測定においては、各熱可塑性エラストマー組成物を用いて、インラインスクリュウタイプ射出成形機(東芝機械社製「IS130」)にて、射出圧力50MPa、シリンダー温度220℃、金型温度40℃の条件下にて、各熱可塑性エラストマー組成物を射出成形して厚さ2mm×幅120mm×長さ120mmのシートを得た。
(2)の圧縮永久歪みの測定においては、JIS K6262に準拠し、得られたシート(厚さ2mm×幅120mm×長さ120mm)を打ち抜いて得たTypeA円盤:29mmφを6枚重ねて試験片を作製し、この試験片を用いて測定した。
(3)の剥離強度の測定においては、オカモト株式会社製クラフトテープ No.204を長さ120mmに切削し、テープの粘着面20mm分を、得られたシート(厚さ2mm×幅120mm×長さ120mm)に貼り付け、テープの残り100mmの粘着面どうしを貼り合わせて把持部とし、その後、幅15mmに切削した試験片を作製し、この試験片を用いて測定した。
また、(4)の表面粗さ測定においては、アイ・ケー・ジー製の直径40mm単軸押出機(L/D=28、圧縮比=2.0、フルフライトスクリュー)で、幅25mm、厚み1mmのシート形状のダイスを使用し、成形温度をそれぞれホッパー下:170℃、シリンダー:180℃~200℃、ダイス:200℃とし、スクリュー回転数:30rpmの条件で成形を行い、得られたシートを用いて測定した。
JIS K6253(Duro-A)を参考にし、硬度(15秒後)を測定した。
JIS K6262を参考にし、70℃、22時間、25%圧縮条件で測定した。
剥離角度180度、剥離速度100mm/minの条件下で、剥離強度を測定した。剥離強度が大きいほど、表面平滑性に優れると判断した。
JIS B0601(2001)の規格を参考にし、二乗平均平方根表面粗さを測定した。表面粗さの値が小さいほど、表面平滑性に優れると判断した。
実施例6~8,比較例7~16では(3)の剥離強度により、表面平滑性を評価した。
<実施例1>
成分(A-1)42質量部、成分(B-1)+(D)混合物81質量部(内訳成分(B-1):58質量部、(D):23質量部)、成分(C-1)2量部、成分(E-2)0.8質量部、成分(F-1)7質量部、成分(G)0.2質量部、成分(H)0.4質量部をヘンシェルミキサーにて1分間ブレンドした。同方向二軸押出機(日本製鋼所「TEX30」、L/D=52.5、シリンダブロック数:14)の上流の供給口へ重量式フィーダーにて混合物を投入した。残りの成分(E-1)+(D-2)混合物8.5質量部(内訳成分(E-1):2.5質量部、(D-2):6質量部)と(D-1)43質量部をそれぞれ液添ポンプにて押出機の途中の供給口から供給し、合計25kg/hの吐出量にて、上流部から下流部を140~200℃の範囲で昇温させ溶融混練を行い、ペレット化して熱可塑性エラストマー組成物を製造した。得られた熱可塑性エラストマー組成物について、前記(1)、(2)、(4)の評価を実施した。得られた評価結果を表-1に示す。
表-1に示したように、成分(A)~(E)(比較例3では成分(C)の代りに成分(C’))の配合組成を変更した以外は実施例1と同様にして熱可塑性エラストマー組成物のペレットを得た。得られた熱可塑性エラストマー組成物を用いて実施例1と同様の評価を実施した。得られた評価結果を表-1に示す。
表-2に示したように、成分(A)~(E)(比較例6では成分(C)の代りに成分(C’))の配合組成を変更した以外は実施例1と同様にして熱可塑性エラストマー組成物のペレットを得た。得られた熱可塑性エラストマー組成物を用いて実施例1と同様の評価を実施した。得られた評価結果を表-2に示す。
表-3に示したように、(B-1)+(D)混合物の代りに(B-2)+(D-1)混合物を用いたこと以外は、それぞれ実施例1と同様にして熱可塑性エラストマー組成物のペレットを得た。得られた熱可塑性エラストマー組成物を用いて前記(1)~(3)の評価を実施した。得られた評価結果を表-3に示す。
表-4に示したように、(B-1)+(D)混合物の代りに(B-2)+(D-1)混合物を用いたこと以外はそれぞれ実施例1と同様にして熱可塑性エラストマー組成物のペレットを得た。得られた熱可塑性エラストマー組成物を用いて前記(1)~(3)の評価を実施した。得られた評価結果を表-4に示す。
表-5に示したように、(B-1)+(D)混合物の代りに(B-2)+(D-1)混合物を用いたこと以外は実施例1と同様にして熱可塑性エラストマー組成物のペレットを得た。得られた熱可塑性エラストマー組成物を用いて前記(1)~(3)の評価を実施した。得られた評価結果を表-5に示す。
表-1~5に示す通り、P-Q型(水添)ジブロック共重合体を所定の割合で含む本発明の熱可塑性エラストマー組成物に該当する実施例1~9は、良好な圧縮永久歪み(高温でのゴム弾性)と表面平滑性を有していることがわかる。
Claims (12)
- 下記成分(A)~(E)を含み、下記成分(A)~(E)の合計100質量%に対し、下記P-Q型ジブロック共重合体及び/又はその水素添加物が0.05~2.0質量%含まれていることを特徴とする熱可塑性エラストマー組成物。
成分(A):ポリオレフィン
成分(B):エチレン・α-オレフィン・非共役ジエン共重合体ゴム
成分(C):芳香族ビニル化合物単位を主体とする重合体ブロックPと共役ジエン単位を主体とする重合体ブロックQとを有するブロック共重合体であって、重合体ブロックPと重合体ブロックQとを各々1個ずつ有するP-Q型ジブロック共重合体を含むブロック共重合体及び/又はその水素添加物
成分(D):炭化水素系ゴム用軟化剤
成分(E):フェノール樹脂を含む架橋剤 - 前記成分(A)と(B)の合計100質量部に対して、前記成分(D)を50質量部以上300質量部以下含む、請求項1に記載の熱可塑性エラストマー組成物。
- JIS K6253(2006年度版)におけるデュロ硬度Aが95以下である、請求項1又は2に記載の熱可塑性エラストマー組成物。
- JIS K6253(2006年度版)におけるデュロ硬度Aが90以下である、請求項3に記載の熱可塑性エラストマー組成物。
- JIS K6253(2006年度版)におけるデュロ硬度Aが45以上95以下である、請求項1又は2に記載の熱可塑性エラストマー組成物。
- JIS K6253(2006年度版)におけるデュロ硬度Aが45以上85以下である、請求項5に記載の熱可塑性エラストマー組成物。
- 前記成分(C)は前記P-Q型ジブロック共重合体を1質量%以上100質量%以下含有するブロック共重合体及び/又はその水素添加物である、請求項1~6のいずれか1項に記載の熱可塑性エラストマー組成物。
- 前記成分(A)と成分(B)との合計100質量%に対して、成分(A)の含有率が1質量%以上50質量%未満である、請求項1~7のいずれか1項に記載の熱可塑性エラストマー組成物。
- 前記成分(A)と(B)の合計100質量部に対して、前記成分(C)を0.1質量部以上400質量部以下含む、請求項1~8のいずれか1項に記載の熱可塑性エラストマー組成物。
- 前記成分(E)がフェノール樹脂と塩化スズを含む、請求項1~9のいずれか1項に記載の熱可塑性エラストマー組成物。
- 前記成分(A)のゲル浸透クロマトグラフィーにより測定したポリスチレン換算の重量平均分子量が270,000以上1,000,000以下である、請求項1~10のいずれか1項に記載の熱可塑性エラストマー組成物。
- 請求項1~11のいずれか1項に記載の熱可塑性エラストマー組成物を成形してなる成形体。
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JP2011184594A (ja) * | 2010-03-09 | 2011-09-22 | Asahi Kasei Chemicals Corp | 架橋組成物、架橋組成物の製造方法、成形体 |
JP2019156484A (ja) * | 2018-03-16 | 2019-09-19 | Mcppイノベーション合同会社 | 易剥離性フィルム |
JP2020189974A (ja) * | 2019-05-20 | 2020-11-26 | クレイトン・ポリマーズ・リサーチ・ベー・フェー | 成形組成物及びこれらから作製される物品 |
JP2021152116A (ja) * | 2020-03-24 | 2021-09-30 | Mcppイノベーション合同会社 | 熱可塑性エラストマー組成物 |
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