WO2022270572A1 - 熱可塑性エラストマー組成物、その成形体、およびその用途 - Google Patents
熱可塑性エラストマー組成物、その成形体、およびその用途 Download PDFInfo
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- WO2022270572A1 WO2022270572A1 PCT/JP2022/025043 JP2022025043W WO2022270572A1 WO 2022270572 A1 WO2022270572 A1 WO 2022270572A1 JP 2022025043 W JP2022025043 W JP 2022025043W WO 2022270572 A1 WO2022270572 A1 WO 2022270572A1
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- ethylene
- thermoplastic elastomer
- copolymer
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- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000010689 synthetic lubricating oil Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229940098697 zinc laurate Drugs 0.000 description 1
- GPYYEEJOMCKTPR-UHFFFAOYSA-L zinc;dodecanoate Chemical compound [Zn+2].CCCCCCCCCCCC([O-])=O.CCCCCCCCCCCC([O-])=O GPYYEEJOMCKTPR-UHFFFAOYSA-L 0.000 description 1
Classifications
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- 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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
-
- 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
- C08L23/14—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
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/14—Copolymers of propene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/14—Copolymers of propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/16—Ethene-propene or ethene-propene-diene copolymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
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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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
Definitions
- the present invention relates to a thermoplastic elastomer composition, its molded article, and its use.
- the interior skin material has transparency to the extent that the display projected on the decorative panel can be seen when the light source of the display device or the operation unit emits light.
- the light source does not emit light (non-light emission)
- high designability intensity (luxury feeling, etc.) is required.
- Patent Document 1 for weather strip applications, 10 to 60 parts by weight of a non-crosslinked crystalline polyolefin resin (A), 1 to 20 parts by weight of a propylene/1-butene/ethylene random copolymer (B), 89 to 20 parts by weight of a partially or wholly crosslinked ethylene/ ⁇ -olefin/nonconjugated polyene copolymer rubber (C) composed of ethylene, an ⁇ -olefin having 3 to 20 carbon atoms and a nonconjugated polyene;
- a thermoplastic elastomer composition comprising agent (D) is disclosed.
- Patent Document 2 describes a thermoplastic resin composition having low viscosity and excellent moldability, which contains a thermoplastic elastomer resin (A), a polyolefin resin (B), a polypropylene resin (C), and an oil (D). disclosed.
- Patent Document 3 1 to 98 parts by weight of isotactic polypropylene (A), 45 to 89 mol% of the propylene component, 10 to 25 mol% of the ethylene component, and optionally an ⁇ - 2 to 99 parts by weight of a propylene/ethylene ( ⁇ -olefin) random copolymer (B) containing 0 to 30 mol% of component units derived from an olefin, and an ethylene/ ⁇ -olefin/non-conjugated polyene copolymer rubber (C)
- a crosslinked thermoplastic elastomer composition is disclosed by mixing 2 to 1900 parts by weight.
- JP 2009-215356 A WO2018/147391 JP 2009-73912 A
- thermoplastic elastomer compositions described in Patent Documents 1 to 3 above both transparency and high designability have not been achieved.
- further transparency is required for the interior covering materials used in the conventional display devices.
- an olefin-based thermoplastic elastomer is used as an interior covering material (especially for display devices and decorative panels)
- light rays are refracted due to the difference in the refractive index of the components in the composition, and conventional interior covering materials It has also become clear that sufficient transparency cannot be obtained.
- the present invention provides a highly transparent thermoplastic elastomer composition that can be suitably used for applications such as interior skin materials without impairing the appearance (design properties such as grain moldability) and moldability of conventional interior skin materials.
- An object is to provide a product and its molded product.
- thermoplastic elastomer composition having the following constitution can solve the above problems, and have completed the present invention.
- the present invention relates to, for example, the following [1] to [8]. [1] 100 parts by mass of an ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A); 10 to 5,000 parts by mass of a soft propylene-based copolymer (B) whose melting point (Tm B ) is not observed or is less than 115°C; 10 to 500 parts by mass of a crystalline polyolefin (C) having a melting point (Tm C ) of 115° C.
- A ethylene/ ⁇ -olefin/non-conjugated polyene copolymer
- B soft propylene-based copolymer
- Tm B melting point
- C crystalline polyolefin having a melting point (Tm C ) of 115° C.
- thermoplastic elastomer composition according to [1] above, wherein the soft propylene-based copolymer (B) further satisfies all of the following requirements (b-1) to (b-2).
- (b-1) Contains 90 to 50 mol % of propylene-derived structural units, 0 to 30 mol % of 1-butene-derived structural units, and 5 to 30 mol % of ethylene-derived structural units.
- the molecular weight distribution (Mw/Mn) determined by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5.
- thermoplastic elastomer composition which is a composition dynamically crosslinked with 0.01 to 10 parts by mass of a crosslinking agent (E).
- Shore A hardness (instantaneous value) (according to the measuring method of JIS K 6253, using three sheets with a thickness of 2 mm stacked) is 40 to 100, according to [3] or [4]
- a thermoplastic elastomer composition of [6] A molded article comprising the thermoplastic elastomer composition according to any one of [1] to [5].
- the molded article according to [7] wherein the automobile interior skin material is an instrument panel, door trim, armrest or console.
- the present invention relates to, for example, ⁇ 1>> to ⁇ 14>> below.
- ⁇ 1>> 100 parts by mass of an ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A), 20 to 5,000 parts by mass of a soft propylene-based copolymer (B) having a melting point (Tm B ) of not observed or less than 115°C; 10 to 500 parts by mass of a crystalline polyolefin (C) having a melting point (Tm C ) of 115° C.
- (b-1) Contains 90 to 50 mol % of propylene-derived structural units, 0 to 30 mol % of 1-butene-derived structural units, and 5 to 30 mol % of ethylene-derived structural units.
- (b-2) The molecular weight distribution (Mw/Mn) determined by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5.
- Composition. ⁇ 4>> The thermoplastic elastomer composition according to any one of ⁇ 1>> to ⁇ 3>>, wherein the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) is at least partially crosslinked.
- ⁇ 6>> A molded article comprising the thermoplastic elastomer composition according to any one of ⁇ 1>> to ⁇ 5>>.
- ⁇ 9>> The molded article according to any one of ⁇ 6>> to ⁇ 8>>, which is an automotive interior covering material.
- ⁇ 10>> The molded article according to ⁇ 9>>, wherein the automotive interior skin material is an instrument panel, door trim, armrest or console.
- A ethylene/ ⁇ -olefin/non-conjugated polyene copolymer
- B soft propylene-based copolymer
- Tm B melting point
- C crystalline polyolefin having a melting
- thermoplastic elastomer composition comprising: 100 parts by mass of an ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A); 0 to 5,000 parts by mass of a soft propylene-based copolymer (B) whose melting point (Tm B ) is not observed or is less than 115°C; 10 to 500 parts by mass of a crystalline polyolefin (C) having a melting point (Tm C ) of 115° C.
- thermoplastic elastomer composition wherein the soft propylene-based copolymer (B) further satisfies all of the following requirements (b-1) to (b-2): (b-1) Contains 90 to 50 mol % of propylene-derived structural units, 0 to 30 mol % of 1-butene-derived structural units, and 5 to 30 mol % of ethylene-derived structural units.
- a highly transparent composition that can be suitably used for applications such as interior skin materials without impairing the appearance (design properties such as grain moldability) and moldability of conventional interior skin materials. and a molded product thereof can be provided.
- a numerical range represented by "-" means a range including the numerical values before and after "-" as lower and upper limits.
- the upper limit and lower limit of each numerical range can be combined arbitrarily.
- thermoplastic elastomer composition contains 100 parts by mass of ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) and the melting point (Tm B ) is confirmed.
- the present composition may contain each of these components, and may be a simple mixture or a composition in which at least a part of the components are crosslinked.
- the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) is not particularly limited as long as it contains ethylene-derived structural units, ⁇ -olefin-derived structural units, and non-conjugated polyene-derived structural units. It can be synthesized by a conventionally known method of copolymerizing ethylene, ⁇ -olefin and non-conjugated polyene.
- the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) contained in the composition may be of one type or two or more types.
- the content of structural units derived from ethylene in the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) (hereinafter also referred to as “ethylene content”) and the content of structural units derived from ⁇ -olefins (hereinafter referred to as Also referred to as " ⁇ -olefin content”.)
- ethylene content is preferably 50 mol% or more from the viewpoint of easily obtaining a molded product with a good molded appearance. , more preferably 50 to 95 mol %, still more preferably 55 to 85 mol %, particularly preferably 60 to 83 mol %.
- the ⁇ -olefin is not particularly limited, an ⁇ -olefin having 3 to 20 carbon atoms is preferable.
- Specific examples of the ⁇ -olefins having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 9-methyl-1- decene, 11-methyl-1-dodecene, 12-ethyl-1-tetradecene.
- One of these ⁇ -olefins may be used, or two or more thereof may be used.
- the ⁇ -olefin propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene are preferable, and propylene is more preferable.
- the ⁇ -olefin content facilitates the formation of a molded product with a good molded appearance. is preferably 50 mol % or less, more preferably 5 to 50 mol %, still more preferably 15 to 45 mol %, and particularly preferably 17 to 40 mol %.
- the ethylene content and ⁇ -olefin content can be obtained by measurement by 13 C-NMR.
- non-conjugated polyenes include linear non-conjugated dienes, cyclic non-conjugated dienes, and trienes. One of these non-conjugated polyenes may be used, or two or more thereof may be used.
- Chain non-conjugated dienes include, for example, 1,4-hexadiene, 1,5-hexadiene, 1,6-hexadiene, 3-methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5- methyl-1,4-hexadiene, 4,5-dimethyl-1,4-hexadiene, 7-methyl-1,6-octadiene, 3,7-dimethyl-1,6-octadiene, 5,7-dimethyl-1, 7-octadiene, 8-methyl-4-ethylidene-1,7-nonadiene, 4-ethylidene-1,7-undecadiene.
- Cyclic non-conjugated dienes include, for example, tetrahydroindene, methyltetrahydroindene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-propenyl-2-norbornene, 5-isopropylidene-2-norbornene, 5 -vinylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene, 5-vinyl-2-norbornene, 5-isopropenyl-2-norbornene, 5-isobutenyl-2-norbornene, 5-cyclohexyl den-2-norbornene, cyclopentadiene, dicyclopentadiene, cyclooctadiene, norbornadiene.
- Trienes include, for example, 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, 2-propenyl-2,2-norbornadiene, 4-ethylidene-8-methyl-1 ,7-nonadiene, 6,10-dimethyl-1,5,9-undecatriene, 5,9-dimethyl-1,4,8-decatriene, 6,9-dimethyl-1,5,8-decatriene, 6 , 8,9-trimethyl-1,5,8-decatriene, 6-ethyl-10-methyl-1,5,9-undecatriene, 4-ethylidene-1,6-octadiene, 7-methyl-4-ethylidene -1,6-octadiene, 7-methyl-4-ethylidene-1,6-nonadiene, 7-ethyl-4-ethylidene-1,6
- non-conjugated polyenes include 1,4-hexadiene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, cyclopentadiene, dicyclopentadiene, 4-ethylidene-8-methyl-1,7- Nonadiene is preferred, and 5-ethylidene-2-norbornene and 5-vinyl-2-norbornene are more preferred.
- the content of structural units derived from non-conjugated polyene in the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) is preferably the iodine value of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). is 1 to 50, more preferably 5 to 40, particularly preferably 10 to 30.
- the content of structural units derived from non-conjugated polyene is usually 2 to 20% by mass with respect to 100% by mass of all structural units constituting the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). .
- ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) a uniform mixture of components (B) to (E) contained in the present composition can be easily obtained. It is desirable to use a component having a Mooney viscosity [ML 1+4 (125°C)] of preferably 10 to 250, more preferably 30 to 150, as measured according to the measurement method of ASTM D 1646-19a. .
- the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) itself does not fall within the above-mentioned Mooney viscosity range, it may be added, if necessary, by a conventionally known method, for example, using an oil extender such as the following softener. It may be used after being oil-extended.
- oil extenders are petroleum softeners such as paraffinic process oils.
- the amount of the oil extender used in the oil extension is preferably such that the Mooney viscosity of the oil extension is within the above range.
- (A) 0 to 150 parts by mass per 100 parts by mass.
- the intrinsic viscosity [ ⁇ ] of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) measured in decalin solvent at 135° C. is preferably 1 to 10 dl/g, more preferably 1.5 to 8 dl. /g.
- the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) may exist in any crosslinked state such as uncrosslinked, partially crosslinked, or completely crosslinked in the present composition.
- the timing of the cross-linking is not particularly limited.
- At least the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) Before mixing with the system copolymer (B), the crystalline polyolefin (C), the softening agent (D), and the cross-linking agent (E), at least the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) Part of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) may be (dynamically) crosslinked, and at least part of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) is mixed after or while being mixed with other components constituting the present composition. may be (dynamically) crosslinked.
- the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) is preferably at least partially crosslinked.
- the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) is crosslinked, it is possible to obtain a composition excellent in mechanical properties, heat resistance, and molded appearance, and a molded article thereof.
- the degree of cross-linking of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) increases, the compression set of the molded article produced from this composition tends to decrease. Therefore, the degree of cross-linking of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) can be estimated from the compression set, oil swelling rate, effective network chain density, etc. of the molded article produced from the present composition. .
- the content of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) in the present composition is the same as the above-mentioned composition because it is possible to easily obtain a molded article having a hardness required for practical use. Although it is not particularly limited as long as it satisfies the amount ratio of each component constituting % by mass or less. Moreover, the lower limit is usually 1% by mass or more, preferably 4% by mass or more.
- the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) may be synthesized by a conventionally known method, or a commercially available product may be used.
- the melting point (Tm B ) of the soft propylene-based copolymer (B) according to the present invention is not observed or is less than 115°C, preferably not observed, or 113°C or lower, more preferably not observed. , or 110° C. or less, more preferably not observed or 108° C. or less.
- the melting point (Tm B ) of the soft propylene-based copolymer (B) is within the above range, it is possible to obtain a composition and molded article excellent in mechanical properties and heat resistance.
- the soft propylene-based copolymer (B) contained in the present composition may be of one type or two or more types.
- the melting point of the soft propylene-based copolymer (B) can be measured by the method described in Examples below.
- the soft propylene-based copolymer (B) includes a propylene homopolymer, a propylene/ethylene block copolymer, a propylene/butene block copolymer, a propylene/ ⁇ -olefin block copolymer, a propylene/ethylene random copolymer, A propylene polymer selected from a propylene/ ⁇ -olefin random copolymer, a propylene/ ⁇ -olefin graft copolymer, a propylene/ ⁇ -olefin/ethylene random copolymer, and the like.
- ⁇ -olefin examples include the ⁇ -olefins described in the above item ⁇ Ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A)>, preferably ethylene or 1-butene, and 1- Butene is more preferred.
- the soft propylene-based copolymer (B) further satisfies all of the following requirements (b-1) to (b-2).
- (b-1) Contains 90 to 50 mol % of propylene-derived structural units, 0 to 30 mol % of 1-butene-derived structural units, and 5 to 30 mol % of ethylene-derived structural units.
- (b-2) The molecular weight distribution (Mw/Mn) determined by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5.
- the soft propylene-based copolymer (B) according to the present invention preferably satisfies one or more of the following requirements (b-3) to (b-5), and requirements (b-3) to (b- It is more preferable to satisfy all of 5).
- the soft propylene-based copolymer (B) has high transparency and can easily obtain a molded article having a good molded appearance.
- the propylene-derived structural unit (hereinafter also referred to as "propylene content”) is preferably 90 to 50 mol%, more preferably 85 to 55 mol%, still more preferably 80 to 65 mol%.
- the 1-butene-derived structural unit (hereinafter also referred to as "1-butene content”) is preferably 0 to 30 mol%, more preferably 1 to 25 mol%, still more preferably 1 to 20 mol%.
- the propylene content, 1-butene content, and ethylene content can be determined by 13 C-NMR measurement.
- the molecular weight distribution (Mw/Mn) of the soft propylene-based copolymer (B) is preferably 1.0 to 3.5, more preferably 1.5 to 3.0, still more preferably 1.7 to 2.8. in the range of By setting the molecular weight distribution (Mw/Mn) within the above range, the moldability of the present composition is improved.
- the molecular weight distribution is a value calculated from the polystyrene equivalent weight average molecular weight (Mw) and number average molecular weight (Mn) measured by gel permeation chromatography (GPC).
- the intrinsic viscosity [ ⁇ ] of the soft propylene-based copolymer (B) measured in decalin solvent at 135° C. is preferably 0.01 to 10 dl/g, more preferably 0.05 to 5.0 dl/g, More preferably 1.0 to 4.5 dl/g.
- the "mm fraction” is defined as the ratio of the methyl groups having the same branching direction when the three head-to-tail propylene unit chains present in the polymer chain are represented by a surface zigzag structure. , determined from the 13 C-NMR spectrum. Specifically, the mm fraction of the soft propylene-based copolymer (B) used in the present invention is described on page 21, line 7 to page 26, line 6 of International Publication No. 2004/087775. method can be obtained.
- the soft propylene-based copolymer (B) used in the present invention preferably has a degree of crystallinity measured by DSC (differential scanning calorimetry) or X-rays that does not exceed 30%.
- the crystallinity is more preferably 25% or less, more preferably 20% or less, and still more preferably 10% or less.
- the heat of fusion ( ⁇ H) of the soft propylene-based copolymer (B) is preferably not observed or less than 50 J/g. More preferably not observed or 45 J/g or less, even more preferably not observed or 40 J/g or less. Since the soft propylene-based copolymer (B) of the present invention satisfies the above range, it tends to have a low degree of crystallinity, and the thermoplastic elastomer composition containing it has excellent transparency.
- the method for producing the soft propylene-based copolymer (B) in the present invention is not particularly limited. It can be produced in the presence of a catalyst containing a titanium component and an organometallic compound as main components, or a metallocene catalyst using a metallocene compound as one component of the catalyst. Among them, it is preferably produced by copolymerizing propylene, 1-butene and ethylene in the presence of a metallocene catalyst.
- the metallocene catalyst it is preferable to use, for example, the catalysts described in Examples e1 to e5 of WO 2004/087775 pamphlet, the catalysts described in JP-A-2007-186664, and the like.
- the present composition contains a soft propylene-based copolymer (B) in an amount of 10 to 5,000 parts by mass, preferably 20 to 5,000 parts by mass, per 100 parts by mass of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). 5,000 parts by mass, more preferably 20 to 4,000 parts by mass, still more preferably 25 to 3,000 parts by mass, still more preferably 27 to 2500 parts by mass, and particularly preferably 30 to 2500 parts by mass.
- B soft propylene-based copolymer
- the present composition forms a sea-island structure with a phase consisting of the ethylene/ ⁇ -olefin/nonconjugated polyene copolymer (A) and a phase consisting of the crystalline polyolefin (C).
- the soft propylene-based copolymer (B) is compatible with the crystalline polyolefin (C) phase, and the refractive index of the crystalline polyolefin (C) phase can be reduced. can. Therefore, it is considered that transparency is improved by reducing the difference in refractive index between the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) phase and the crystalline polyolefin (C) phase.
- the crystalline polyolefin (C) has a melting point (Tm C ) of 115° C. or higher. It is preferably 115 to 175°C, more preferably 118 to 172°C, still more preferably 120 to 170°C.
- Tm C melting point
- Tm c melting point of the crystalline polyolefin
- the melting point of the crystalline polyolefin (C) can be measured by the method described in Examples below.
- the heat of fusion ( ⁇ H) of the crystalline polyolefin (C) according to the present invention is preferably 50 J/g or more. It is more preferably 60 J/g or more, still more preferably 70 J/g or more. Since the crystalline polyolefin (C) of the present invention satisfies the above range, it tends to have a high degree of crystallinity, and the thermoplastic elastomer composition containing it has excellent physical properties such as mechanical properties and heat resistance.
- the method for producing the crystalline polyolefin (C) used in the present invention is not particularly limited as long as a crystalline polymer can be obtained. , preferably by polymerizing one or more monoolefins.
- Crystalline polyolefin (C) may be a homopolymer or a copolymer.
- the homopolymer may have an isotactic structure or a syndiotactic structure.
- the homopolymer is generally an ethylene homopolymer, a propylene homopolymer or a 1-butene homopolymer, preferably an ethylene homopolymer or a propylene homopolymer, more preferably a propylene homopolymer. be.
- the copolymer is not limited as long as two or more monoolefins are polymerized.
- the structure of the copolymer may be a random structure or a block structure.
- Suitable raw material olefins specifically include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 2-methyl-1-propene, 3-methyl-1- Examples include ⁇ -olefins having 2 to 20 carbon atoms such as pentene, 4-methyl-1-pentene and 5-methyl-1-hexene. The number of carbon atoms is preferably 2-12, more preferably 2-6.
- ⁇ -olefins may be used alone or in combination of two or more.
- specific examples of copolymers include propylene/ethylene random copolymers, propylene/ethylene block copolymers, ethylene/1-butene copolymers, ethylene/1-hexene copolymers, ethylene/4-methyl -1-pentene copolymers.
- a typical resin of the crystalline polyolefin (C) is also commercially available.
- Commercially available products of crystalline polyolefin (C) include, for example, Evolue [registered trademark] (manufactured by Prime Polymer Co., Ltd.), Prime Polypro [registered trademark] (manufactured by Prime Polymer Co., Ltd.), Novatec TM (Japan Polypropylene Co., Ltd. )) and SunAllomer [registered trademark] (manufactured by SunAllomer Co., Ltd.).
- the crystalline polyolefin (C) used in the present invention has a role of improving the fluidity and heat resistance of the present composition.
- the crystalline polyolefin (C) has a melt flow rate (MFR: ASTM D 1238-65T, 230°C, 2.16 kg load) of usually 0.01 to 100 g/10 minutes, preferably 0.05 to 80 g/10 minutes. , more preferably 0.5 to 50 g/10 min, still more preferably 0.5 to 30 g/10 min.
- the present composition contains 10 to 500 parts by mass, preferably 30 to 450 parts by mass, and more of crystalline polyolefin (C) with respect to 100 parts by mass of ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). It preferably contains 50 to 400 parts by mass.
- softening agents include petroleum-based softening agents such as process oil, lubricating oil, paraffin, liquid paraffin, polyethylene wax, polypropylene wax, petroleum asphalt, and vaseline; coal tar-based softening agents such as coal tar and coal tar pitch; Fatty oil-based softeners such as castor oil, linseed oil, rapeseed oil, soybean oil, coconut oil; Fatty acids or fatty acid salts such as barium stearate, calcium stearate, zinc laurate; naphthenic acid; pine oil, rosin or derivatives thereof; synthetic polymer softeners such as terpene resin, petroleum resin, coumarone-indene resin, atactic polypropylene Ester-based softening agents such as dioctyl phthalate, dioctyl adipate, and dioc
- the softener may be premixed (oil-extended) with, for example, the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). Alternatively, it may be added after the dynamic heat treatment of each component incorporated in the present composition.
- the softening agent (D) is added to 0 to 200 parts by mass, preferably 1 to 200 parts by mass, more preferably 100 parts by mass of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). 20 to 200 parts by mass, more preferably 40 to 180 parts by mass, particularly preferably 50 to 150 parts by mass.
- the present composition contains 0 to 70 parts by mass or 0 to 70.0 parts by mass of a softening agent (D) with respect to 100 parts by mass of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). is also a preferred embodiment.
- the softening agent (D) is added to 100 parts by mass of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A), and more preferably 1 to 70 parts by mass or 1 to 70.0 parts by mass. , more preferably 20 to 70 parts by mass or 20 to 70.0 parts by mass, and particularly preferably 40 to 70 parts by mass or 40 to 70.0 parts by mass.
- the content of the softening agent is within the above range, there is a tendency that the present composition having fluidity suitable for molding can be easily obtained, and a molded article excellent in mechanical properties, heat resistance, and heat aging resistance is obtained. tend to be easily obtained.
- ⁇ Crosslinking agent (E)> When the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) in the present composition is desired to be partially or completely crosslinked, in particular, the uncrosslinked present composition containing each component is dynamically crosslinked. In some cases, it is preferred to use a cross-linking agent (E), and the cross-linking agent (E) is used in the preparation of the present composition in which at least a portion of the components are cross-linked.
- the cross-linking agent (E) is not particularly limited, and conventionally known cross-linking agents can be used. Specific examples include organic peroxides, sulfur, sulfur compounds, and phenol-based cross-linking agents.
- organic peroxides are preferable from the viewpoint that the resulting composition and its molded article are excellent in transparency, high designability, heat resistance and mechanical properties.
- organic peroxides include dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, 2,5-dimethyl-2,5- Di(tert-butylperoxy)hexyne-3, 1,3-bis(tert-butylperoxyisopropyl)benzene, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl- 4,4-bis(tert-butylperoxy)valerate, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, tert-but
- 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy) ) Hexyne-3, 1,3-bis(tert-butylperoxyisopropyl)benzene, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl-4,4-bis( tert-butylperoxy)valerate is preferred.
- the content of the cross-linking agent (E) in the present composition is ethylene/ ⁇ - Per 100 parts by mass of the olefin/non-conjugated polyene copolymer (A), preferably 0.01 to 10 parts by mass, more preferably 0.1 to 8.0 parts by mass, still more preferably 0.1 to 5.0 parts by mass Parts by mass, more preferably 0.1 to 3.0 parts by mass.
- the cross-linking aid is not particularly limited, and conventionally known cross-linking aids can be used, and may be appropriately selected according to the type of the cross-linking agent (E).
- examples of the crosslinking aid include sulfur, p-quinonedioxime, p,p'-dibenzoylquinonedioxime, N-methyl-N,4 - dinitrosoaniline, nitrobenzene, diphenylguanidine, trimethylolpropane-N,N'-m-phenylenedimaleimide, divinylbenzene, triallyl cyanurate, vinyl butyrate, vinyl stearate, elethine glycol dimethacrylate, diethylene glycol dimethacrylate , polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, allyl methacrylate and the like vinyl or methacrylate monomers.
- divinylbenzene has good compatibility with each component constituting the present composition and has a solubilizing action for organic peroxides, so it is used as a dispersing aid for organic peroxides. also works, so uniform cross-linking is likely to occur during heat treatment, which is preferable. Therefore, by using divinylbenzene as a cross-linking aid, there is a tendency to easily obtain the present composition having well-balanced fluidity and physical properties.
- the content of the cross-linking aid in the present composition is preferably 0.5 parts per 100 parts by mass of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). 01 to 10.0 parts by mass, more preferably 0.1 to 8.0 parts by mass, still more preferably 0.1 to 5.0 parts by mass, and particularly preferably 0.1 to 3.0 parts by mass.
- the present composition may contain other polymers or additives, if necessary, to the extent that the objects of the present invention are not impaired.
- polystyrene thermoplastic elastomers examples include styrene thermoplastic elastomers, propylene/ ⁇ -olefin random copolymers, butyl rubber, polyisobutylene rubber, nitrile rubber (NBR), natural rubber (NR), and silicone rubber. be done.
- the amount added is usually 0.1 to 50 parts by mass, preferably 5 to 40 parts by mass, relative to 100 parts by mass of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A). Department.
- A ethylene/ ⁇ -olefin/non-conjugated polyene copolymer
- Each of the other polymers or additives may be used alone or in combination of two or more.
- styrene-based thermoplastic elastomer examples include styrene/isoprene block copolymers, hydrogenated styrene/isoprene block copolymers (SEP), and hydrogenated styrene/isoprene/styrene block copolymers.
- SEPS polystyrene-polyethylene/propylene-polystyrene block copolymer
- styrene-butadiene copolymer e.g., styrene-butadiene block copolymer
- SEBS hydrogenated styrene-butadiene block copolymer
- additives include cross-linking aids, antistatic agents, anti-aging agents, flame retardants, slip agents, nucleating agents, fillers, antioxidants, weather stabilizers, colorants and the like.
- the total amount thereof is usually 0.01 to 20 parts by mass, preferably 0.1 to 10 parts by mass, per 100 parts by mass of the total amount of components (A) to (C). parts by mass, more preferably 0.1 to 5 parts by mass.
- the filler it is usually 1 to 50 parts by mass, preferably 1 to 45 parts by mass, more preferably 1 to 40 parts by mass, per 100 parts by mass of component (A).
- nucleating agent examples include non-melting and melting crystallization nucleating agents, and these can be used alone or in combination of two or more.
- Non-melting type crystallization nucleating agents include inorganic substances such as talc, mica, silica, and aluminum, brominated biphenyl ether, aluminum hydroxy di-p-tert-butylbenzoate (TBBA), organic phosphates, and rosin-based crystallization.
- nucleating agents substituted triethylene glycol terephthalate and Terylene & Nylon fibers, especially hydroxy-di-p-tert-butylbenzoic acid aluminum, methylene bis (2,4-di-tert-butylphenyl) phosphate sodium salt, 2, Sodium 2'-methylenebis(4,6-di-tert-butylphenyl)phosphate, a rosin-based crystallization nucleating agent, is preferred.
- Melting-type crystallization nucleating agents include sorbitol compounds such as dibenzylidene sorbitol (DBS), substituted DBS, and lower alkyldibenzylidene sorbitol (PDTS).
- sorbitol compounds such as dibenzylidene sorbitol (DBS), substituted DBS, and lower alkyldibenzylidene sorbitol (PDTS).
- slip agent examples include fatty acid amides, silicone oils, glycerin, waxes, and paraffin oils.
- the filler include conventionally known fillers, and specific examples include carbon black, calcium carbonate, calcium silicate, clay, kaolin, talc, silica, diatomaceous earth, mica powder, asbestos, alumina, and barium sulfate. , aluminum sulfate, calcium sulfate, basic magnesium carbonate, molybdenum disulfide, graphite, glass fiber, glass ball, shirasu balloon, basic magnesium sulfate whisker, calcium titanate whisker, aluminum borate whisker, etc. mentioned.
- the composition comprises an ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A), a soft propylene-based copolymer (B), a crystalline polyolefin (C), a softening agent (D), and a cross-linking agent. It can be produced by mixing and kneading (E) and, if necessary, other additives described above.
- this composition For the production of this composition, general methods such as a Banbury mixer, kneader, single-screw extruder, twin-screw extruder, etc., which are used for the production of ordinary resin compositions and elastomer compositions, can be employed.
- a twin-screw extruder is preferable from the viewpoint of achieving dynamic crosslinking particularly efficiently.
- the twin-screw extruder can not only uniformly and finely disperse the components (A) to (E), but also can accelerate the cross-linking reaction by adding other components. As a result, the present composition can be produced continuously, which is preferable.
- the present composition in which at least a portion of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) is crosslinked comprises the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) and soft propylene Uncrosslinked present composition obtained by blending a system copolymer (B), a crystalline polyolefin (C), a softening agent (D), a cross-linking agent (E), and, if necessary, the other additives described above.
- the article is preferably prepared by dynamic crosslinking (dynamic heat treatment).
- the dynamic cross-linking includes, for example, mixing and kneading the components (A) to (E) and, if necessary, the other polymers or additives described above with a mixing and kneading device while heating, It is preferable to crosslink while applying a shearing force. It should be noted that at the time of dynamic crosslinking, it is preferable to use at least a crosslinking aid as the other additives described above.
- the soft propylene-based copolymer (B) in the present composition may be added either before dynamic crosslinking or after dynamic crosslinking, or may be added separately before dynamic crosslinking and after dynamic crosslinking. good.
- dynamic crosslinking it is possible to obtain a composition containing a component in which at least a portion of the ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A) is crosslinked.
- “at least partially crosslinked” means that the gel content is in the range of 5 to 98% by weight, preferably 10 to 95% by weight.
- Dynamic cross-linking is preferably carried out in a non-open type apparatus, and preferably in an atmosphere of an inert gas such as nitrogen or carbon dioxide gas.
- the heating temperature for dynamic crosslinking is usually 125 to 280° C., preferably 145 to 240° C., and the mixing/kneading time is usually 1 to 30 minutes, preferably 3 to 20 minutes.
- the maximum shear rate is, for example, 10 to 100,000 sec -1 , preferably 100 to 50,000 sec -1 , more preferably 1,000 to 10,000 sec. -1 , more preferably 2,000 to 7,000 sec -1 .
- Preferred embodiments of the method for producing the present composition include, for example, the following. 100 parts by mass of an ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A); 0 to 5,000 parts by mass, preferably 10 parts by mass or more, 20 parts by mass or more, 25 parts by mass or more of a soft propylene-based copolymer (B) having a melting point (Tm B ) of not observed or less than 115°C , 27 parts by mass or more, 30 parts by mass or more, 4000 parts by mass or less, 3000 parts by mass or less, and 2500 parts by mass or less; 10 to 500 parts by mass of a crystalline polyolefin (C) having a melting point (Tm C ) of 115° C.
- A ethylene/ ⁇ -olefin/non-conjugated polyene copolymer
- B soft propylene-based copolymer having a melting point (Tm B ) of not observed or less
- the components (A) to (E) are introduced sequentially or simultaneously into an apparatus capable of melt-kneading the resin components, preferably a twin-screw extruder, and dynamic crosslinking is performed under the conditions described above. This is the step of obtaining the object (i).
- the second step is a step of adding the soft propylene-based copolymer (B) to the composition (i) obtained in the first step.
- the second step may be performed following the first step, or after the first step, the second step may be performed after pelletizing the obtained composition (i). good.
- the soft propylene-based copolymer (B) may be added only in the first step or only in the second step. It may be added in the second step.
- the soft propylene-based copolymer (B) is added only in the second step, that is, the soft propylene-based copolymer added in the first step
- the amount of copolymer (B) is preferably 0 parts by mass.
- part or all of the softener constituting the present composition may be added in the second step.
- the composition is produced by adding the soft propylene-based copolymer (B) only in the first step, the composition should be produced only in the first step, that is, the second step should be included. It is also preferable to manufacture in a manner that does not
- the present composition contains components other than components (A) to (E), the other components may be added in the first step or the second step, but the cross-linking aid is used, the cross-linking coagent is desirably added in the first step.
- the melt flow rate of the present composition is preferably 1 g/10 minutes or more, 100 g/10 minutes or more, because the composition has excellent moldability. less than, more preferably 1 g/10 minutes or more and less than 80 g/10 minutes.
- the Shore A hardness (instantaneous value) of the present composition is preferably 40-100, more preferably 50-95, still more preferably 55-90.
- the Shore A hardness (instantaneous value) is in the above range, it is possible to obtain a composition or a molded product having excellent design properties such as touch and high-class appearance, and scratch resistance necessary for practical use. It can be suitably used for parts such as skin materials.
- the Shore A hardness (instantaneous value) can be measured by the method described in Examples below.
- the composition is excellent in moldability, can be suitably used for applications requiring designability such as texture molding, and is also excellent in transparency.
- the molded article according to the present invention is not particularly limited as long as it includes the present composition, and is a molded article molded using any known molding method depending on the application. Examples of molding methods include press molding, injection molding, extrusion molding, calendar molding, blow molding, vacuum molding, and compression molding.
- the molded article according to the present invention may be a molded article molded from the present composition alone, or may be a molded article molded in combination with other materials.
- the molded article according to the present invention may be used alone or in combination with molded articles made of other materials.
- the internal haze of the molded article according to the present invention is preferably 80% or less, more preferably 70% or less, and even more preferably 50% or less.
- the internal haze is 80% or less, the molded article has good transparency.
- the internal haze of the molded article refers to the haze excluding the haze due to the shape of the outer surface of the molded article.
- the total light transmittance of the molded article according to the present invention is preferably 83% or higher, more preferably 85% or higher.
- the molded article has good transparency.
- the internal haze and the total light transmittance can be measured by the methods described in Examples below.
- the molded article according to the present invention is suitably used as an automotive interior covering material.
- automotive interior skin materials include instrument panels, door trims, armrests, and consoles.
- the molded article according to the present invention can also be used as part of the interior decoration of buildings (office buildings, hotels, shops, general households, etc.).
- the molded article according to the present invention can be used for various display devices, decorative panels, liquid crystal televisions, lighting switches, bathroom monitors, furniture, audio equipment, speakers, home appliances (rice cookers, microwave ovens, washing machines, air conditioners, etc.) panels, telephones, remote controllers, etc.).
- thermoplastic elastomer composition of the present invention can be suitably used as the surface layer of display devices or decorative panels having an operation section because the composition has excellent moldability and transparency.
- a decorative panel according to the present invention includes a decorative panel having a display device or an operation unit.
- the decorative panel of the present invention is 100 parts by mass of an ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A); 10 to 5,000 parts by mass of a soft propylene-based copolymer (B) whose melting point (Tm B ) is not observed or is less than 115°C; 10 to 500 parts by mass of a crystalline polyolefin (C) having a melting point (Tm C ) of 115° C.
- A ethylene/ ⁇ -olefin/non-conjugated polyene copolymer
- B soft propylene-based copolymer
- Tm B melting point
- C crystalline polyolefin having a melting point (Tm C ) of 115° C.
- thermoplastic elastomer composition contained in the molded article constituting the decorative panel of the present invention is preferably the present composition described above.
- the preferred thermoplastic elastomer composition contained in the molding constituting the decorative panel of the present invention is 100 parts by mass of an ethylene/ ⁇ -olefin/non-conjugated polyene copolymer (A); 20 to 5,000 parts by mass of a soft propylene-based copolymer (B) having a melting point (Tm B ) of not observed or less than 115°C; 10 to 500 parts by mass of a crystalline polyolefin (C) having a melting point (Tm C ) of 115° C.
- the soft propylene-based copolymer (B) further satisfies the following requirement (b-1).
- (b-1) Contains 90 to 50 mol % of propylene-derived structural units, 0 to 30 mol % of 1-butene-derived structural units, and 5 to 30 mol % of ethylene-derived structural units. Also preferably, the soft propylene-based copolymer (B) further satisfies the following requirement (b-2).
- the decorative panel of the present invention usually has a structure in which a display device or an operation part is provided at the bottom of a molded article containing a thermoplastic elastomer composition, that is, a molding containing a thermoplastic elastomer composition on the display device or the operation part A body is provided, and the display indicated by the display device or the operation unit can be visually recognized through the molded article containing the thermoplastic elastomer composition.
- the display indicated by the display device or the operation unit can be viewed through the molded article containing the thermoplastic elastomer composition.
- the light source does not emit light (non-light emission)
- only the molded body surface can be visually recognized.
- Such a decorative panel of the present invention can be suitably used for automobile instrument panels, display devices, or various devices having an operation unit, and is particularly suitable for applications requiring good design, such as in automobiles or indoors. can be used for
- Weight average molecular weight (Mw), number average molecular weight (Mn), and molecular weight distribution (Mw/Mn) The weight average molecular weight (Mw), number average molecular weight (Mn), and molecular weight distribution (Mw/Mn) of the soft propylene-based copolymers (B-1), (B-2) and (B-3) were determined by gel perm. Measurement was performed at a column temperature of 140°C by aeration chromatography (GPC). Weight average molecular weight (Mw) and number average molecular weight (Mn) were both measured in terms of standard polystyrene. Mw/Mn was calculated based on the weight average molecular weight (Mw) and number average molecular weight (Mn).
- the heat of fusion ( ⁇ H) is calculated by using the line connecting the point on the low temperature side where there is no change in heat quantity and the point on the high temperature side where there is no change in heat quantity as the baseline, and the line portion containing the peak of the endothermic curve obtained by the above measurement and the above It is calculated by finding the area surrounded by the baseline.
- the temperature and peak area of the peak detected on the highest temperature side were taken as the melting point (Tm) and the heat of fusion ( ⁇ H), respectively.
- Tm melting point
- ⁇ H heat of fusion
- the intrinsic viscosities [ ⁇ ] of the soft polypropylenes (B-1) and (B-2) are values measured at 135° C. using decalin solvent.
- the numerical value of the copolymer (A-1) in Table 1 indicates the amount of the rubber component only, excluding the amount of oil extension.
- Softener (D-1) Paraffin-based process oil (trade name: Diana Process Oil PW-100, manufactured by Idemitsu Kosan Co., Ltd.)
- the numerical value of the softening agent (D-1) in Table 1 includes the amount derived from the oil extension of the copolymer.
- Crosslinking agent (E-1) Organic peroxide (2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane), trade name: Perhexa 25B, manufactured by NOF Corporation)
- Other components (6-1) Cross-linking aid Divinylbenzene (trade name: DVB-810, manufactured by Nippon Steel Chemical & Materials Co., Ltd.)
- Example 1 Synthesized in Synthesis Example 1 with respect to 100 parts by mass of copolymer (A) (140 parts by mass of oil-extended ethylene/propylene/non-conjugated diene copolymer rubber (EPDM, trade name: 3072EPM; manufactured by Mitsui Chemicals, Inc.)) 2000 parts by mass of the obtained copolymer (B-1), 350 parts by mass of the crystalline polyolefin (C-1), 1.0 part by mass of the cross-linking agent (E-1), and 1 part of divinylbenzene as a cross-linking aid. 0 parts by mass were thoroughly mixed with a Henschel mixer.
- copolymer (A) 140 parts by mass of oil-extended ethylene/propylene/non-conjugated diene copolymer rubber (EPDM, trade name: 3072EPM; manufactured by Mitsui Chemicals, Inc.)
- EPDM oil-extended ethylene/propylene/non-conjugated dien
- thermoplastic elastomer composition Pellets of the thermoplastic elastomer composition were obtained in the same manner as in Example 1, except that the amounts of the raw materials used were changed as shown in Table 1.
- Example 8 Example except that the copolymer (B-1) used was changed to the copolymer (B-2) synthesized in Synthesis Example 2, and the amount of the raw materials used was changed as shown in Table 1. Pellets of a thermoplastic elastomer composition were obtained in the same manner as in 1.
- Example 9 In the same manner as in Example 1 except that the copolymer (B-1) used was changed to the copolymer (B-3) and the blending amounts of the raw materials used were changed as shown in Table 1. Pellets of a thermoplastic elastomer composition were obtained.
- Example 10-11 Pellets of a thermoplastic elastomer composition were obtained in the same manner as in Example 1, except that the blending amounts of the raw materials used were changed as shown in Table 1 and the crystalline polyolefin (C-2) was used. .
- Copolymer (A) 100 parts by mass (oil-extended ethylene/propylene/non-conjugated diene copolymer rubber (EPDM, trade name: 3072EPM; manufactured by Mitsui Chemicals, Inc.) 140 parts by mass), crystalline polyolefin (C -1) 350 parts by mass, 1.0 parts by mass of the cross-linking agent (E-1), and 1.0 parts by mass of divinylbenzene as a cross-linking aid were sufficiently mixed in a Henschel mixer.
- EPDM oil-extended ethylene/propylene/non-conjugated diene copolymer rubber
- C -1 crystalline polyolefin
- E-1 cross-linking agent
- divinylbenzene as a cross-linking aid
- Example 13 Pellets of a thermoplastic elastomer composition were obtained in the same manner as in Example 12, except that the blending amounts of the raw materials used were changed as shown in Table 1.
- thermoplastic elastomer composition Pellets of the thermoplastic elastomer composition were obtained in the same manner as in Example 1, except that the copolymer (B-1) was not used and the blending amounts of the raw materials were changed as shown in Table 1.
- thermoplastic elastomer composition ⁇ Preparation of press sheet> Pellets of the thermoplastic elastomer compositions obtained in Examples and Comparative Examples were pressed with a hot press molding machine (pressing temperature: 190°C, cooling temperature: 20°C, preheating time: 6 minutes, pressure melting time: : 4 minutes). As a result of pressing, two types of flat pressed sheets with different thicknesses were produced for each composition.
- the press sheets obtained were 12 cm long ⁇ 14.7 cm wide ⁇ 2 mm thick and 12 cm long ⁇ 14.7 cm wide ⁇ 0.5 mm thick, respectively.
- melt flow rate was measured using the pellets of the thermoplastic elastomer compositions obtained in Examples and Comparative Examples at 230° C. and a load of 10 kg according to JIS K 7210. Table 1 shows the results.
- a dumbbell-shaped No. 3 test piece was produced by punching out the press sheet having a thickness of 2 mm. Using the prepared test piece, a tensile test (tensile speed: 500 mm / min, measurement temperature: 23 ° C.) was performed in accordance with JIS K 6251, modulus at 100% elongation (M100), stress at break (TB) and elongation at break (EB) were measured. Table 1 shows the results.
- the sheet By vacuum forming the sheet (molding temperature: 160°C, vacuum forming machine BVF-1010-PWB manufactured by Fuse Vacuum Co., Ltd.), the sheet is formed into a mold with a texture and at the same time, the texture is transferred to the sheet. , an instrument panel with crimps, and a molded body sample in the shape of a door trim. Using the molding sample after shaping, grain transferability and corner transferability were evaluated according to the following criteria.
- ⁇ Corner transferability> The transferability of the corner shape at the corner portion of the sheet of the molded sample was visually evaluated. The evaluation was made on a 5-point scale, and the evaluation contents were as follows. The number of evaluation persons was 3, and the average score of the 3 persons was used as the score.
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Abstract
Description
[1] エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)10~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~200質量部と、
架橋剤(E)0.01~10質量部と
を含む、熱可塑性エラストマー組成物。
[2] 前記軟質プロピレン系共重合体(B)が、さらに下記の要件(b-1)~(b-2)をいずれも満たす、前記[1]に記載の熱可塑性エラストマー組成物。
(b-1)プロピレン由来の構成単位を90~50モル%、1-ブテン由来の構成単位を0~30モル%、およびエチレン由来の構成単位を5~30モル%含有する。
(b-2)ゲルパーミエーションクロマトグラフィー(GPC)により求められる分子量分布(Mw/Mn)が1.0~3.5の範囲にある。
[3] エチレン・α-オレフィン・非共役ポリエン系共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)10~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~200質量部と、
架橋剤(E)0.01~10質量部と
を動的架橋した組成物である、熱可塑性エラストマー組成物。
[4] エチレン・α-オレフィン・非共役ポリエン共重合体(A)の少なくとも一部が架橋している、前記[3]に記載の熱可塑性エラストマー組成物。
[5] ショアA硬度(瞬間値)(JIS K 6253の測定方法に準拠、厚さ2mmのシートを3枚重ねて用いる)が、40~100である、前記[3]または[4]に記載の熱可塑性エラストマー組成物。
[6] 前記[1]~[5]のいずれかに記載の熱可塑性エラストマー組成物を含む、成形体。
[7] 自動車内装表皮材である、前記[6]に記載の成形体。
[8] 前記自動車内装表皮材がインストルメントパネル、ドアトリム、アームレストまたはコンソールである前記[7]に記載の成形体。
《1》 エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)20~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~70質量部と、
架橋剤(E)0.01~10質量部と
を含み、
前記軟質プロピレン系共重合体(B)が、さらに下記の要件(b-1)~(b-2)をいずれも満たす、熱可塑性エラストマー組成物:
(b-1)プロピレン由来の構成単位を90~50モル%、1-ブテン由来の構成単位を0~30モル%、およびエチレン由来の構成単位を5~30モル%含有する。
(b-2)ゲルパーミエーションクロマトグラフィー(GPC)により求められる分子量分布(Mw/Mn)が1.0~3.5の範囲にある。
《2》 前記架橋剤(E)が有機過酸化物である、《1》に記載の熱可塑性エラストマー組成物。
《3》 メルトフローレート(JIS K 7210の測定方法に準拠、230℃、10kg荷重)が1g/10分以上、80g/10分未満である、《1》または《2》に記載の熱可塑性エラストマー組成物。
《4》 エチレン・α-オレフィン・非共役ポリエン共重合体(A)の少なくとも一部が架橋している、《1》~《3》のいずれかに記載の熱可塑性エラストマー組成物。
《5》 ショアA硬度(瞬間値)(JIS K 6253の測定方法に準拠、厚さ2mmのシートを3枚重ねて用いる)が、40~100である、《1》~《4》のいずれかに記載の熱可塑性エラストマー組成物。
《6》 《1》~《5》のいずれかに記載の熱可塑性エラストマー組成物を含む、成形体。
《7》 内部ヘイズが80%以下である、《6》に記載の成形体。
《8》 全光線透過率が83%以上である、《6》または《7》に記載の成形体。
《9》 自動車内装表皮材である、《6》~《8》のいずれかに記載の成形体。
《10》 前記自動車内装表皮材がインストルメントパネル、ドアトリム、アームレストまたはコンソールである《9》に記載の成形体。
《11》 エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)10~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~200質量部と、
架橋剤(E)0.01~10質量部と
を含む熱可塑性エラストマー組成物を含む成形体と、
前記成形体の下部に設けられた表示装置または操作部と、
を備えることを特徴とする、装飾パネル。
《12》 熱可塑性エラストマー組成物の製造方法であって、前記製造方法が、
エチレン・α-オレフィン・非共役ポリエン系共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)0~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~70質量部と、
架橋剤(E)0.01~10質量部と
を動的架橋して組成物(i)を得る第一工程と、
前記組成物(i)に軟質プロピレン系共重合体(B)0~5,000質量部を添加する第二工程を有し、
前記第一工程および第二工程で添加される前記軟質プロピレン系共重合体(B)の合計量が、20~5,000質量部であり、
前記軟質プロピレン系共重合体(B)が、さらに下記の要件(b-1)~(b-2)をいずれも満たす、熱可塑性エラストマー組成物の製造方法:
(b-1)プロピレン由来の構成単位を90~50モル%、1-ブテン由来の構成単位を0~30モル%、およびエチレン由来の構成単位を5~30モル%含有する。
(b-2)ゲルパーミエーションクロマトグラフィー(GPC)により求められる分子量分布(Mw/Mn)が1.0~3.5の範囲にある。
《13》 前記第一工程で添加される前記軟質プロピレン系共重合体(B)の量が、0質量部である、《12》に記載の熱可塑性エラストマー組成物の製造方法。
また、数値範囲が段階的に記載されている場合、各数値範囲の上限及び下限は任意に組み合わせることができる。
本発明に係る熱可塑性エラストマー組成物(以下、「本組成物」ともいう。)は、エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、融点(TmB)が確認されないか、または115℃未満である、軟質プロピレン系共重合体(B)10~5,000質量部と、融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、軟化剤(D)0~200質量部と、架橋剤(E)0.01~10質量部とを含む組成物であり、好ましくは、エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、融点(TmB)が確認されないか、または115℃未満である、軟質プロピレン系共重合体(B)20~5,000質量部と、融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、軟化剤(D)0~70質量部と、架橋剤(E)0.01~10質量部とを含む組成物である。本組成物は、これらの各成分を含むものであればよく、単に混合したものであっても、少なくとも一部の成分が架橋されたものであってもよい。
エチレン・α-オレフィン・非共役ポリエン共重合体(A)は、エチレン由来の構成単位、α-オレフィン由来の構成単位、および、非共役ポリエン由来の構成単位を含めば特に制限されず、例えば、エチレン、α-オレフィンおよび非共役ポリエンを共重合する従来公知の方法で合成することができる。
エチレン・α-オレフィン・非共役ポリエン共重合体(A)中のエチレン由来の構成単位の含有量(以下、「エチレン含量」ともいう。)とα-オレフィン由来の構成単位の含有量(以下、「α-オレフィン含量」ともいう。)との合計を100モル%とした場合、エチレン含量は、成形外観が良好な成形体を容易に得ることができる等の点から、好ましくは50モル%以上、より好ましくは50~95モル%、さらに好ましくは55~85モル%、特に好ましくは60~83モル%である。
エチレン・α-オレフィン・非共役ポリエン共重合体(A)中のエチレン含量とα-オレフィン含量との合計を100モル%とした場合、α-オレフィン含量は、成形外観が良好な成形体を容易に得ることができる等の点から、好ましくは50モル%以下、より好ましくは5~50モル%、さらに好ましくは15~45モル%、特に好ましくは17~40モル%である。
非共役ポリエンとしては、例えば、鎖状非共役ジエン、環状非共役ジエン、トリエンが挙げられる。これらの非共役ポリエンは、1種を用いてもよく、2種以上を用いてもよい。
エチレン・α-オレフィン・非共役ポリエン共重合体(A)は従来公知の方法で合成してもよく、市販品を用いてもよい。
本発明に係る軟質プロピレン系共重合体(B)の融点(TmB)は観測されないか、または115℃未満であり、好ましくは、観測されないか、または113℃以下、より好ましくは、観測されないか、または110℃以下、さらに好ましくは観測されないか、または108℃以下である。軟質プロピレン系共重合体(B)の融点(TmB)が前記範囲内にあると、機械物性や耐熱性に優れる組成物および成形体を得ることができる。本組成物に含まれる軟質プロピレン系共重合体(B)は、1種でもよく、2種以上でもよい。
軟質プロピレン系共重合体(B)は、プロピレン単独重合体、プロピレン・エチレンブロック共重合体、プロピレン・ブテンブロック共重合体、プロピレン・α-オレフィンブロック共重合体、プロピレン・エチレンランダム共重合体、プロピレン・α-オレフィンランダム共重合体、プロピレン・α-オレフィングラフト共重合体、プロピレン・α-オレフィン・エチレンランダム共重合体等から選択されるプロピレン重合体である。
軟質プロピレン系共重合体(B)は、さらに下記の要件(b-1)~(b-2)をすべて満たす。
(b-2)ゲルパーミエーションクロマトグラフィー(GPC)により求められる分子量分布(Mw/Mn)が1.0~3.5の範囲にある。
(b-4)トリアッドタクティシティ(mm分率)が85%以上である。
(b-5)融解熱量(ΔH)が、観測されないか、または50J/g未満である。
以下、これらの各要件について説明する。
軟質プロピレン系共重合体(B)は、透明性が高く、成形外観が良好な成形体を容易に得ることができる等の点から、軟質プロピレン系共重合体(B)を構成する構成単位100モル%とした場合、プロピレン由来の構成単位(以下、「プロピレン含量」ともいう。)を好ましくは90~50モル%、より好ましくは85~55モル%、さらに好ましくは80~65モル%の量で、1-ブテン由来の構成単位(以下、「1-ブテン含量」ともいう。)を好ましくは0~30モル%、より好ましくは1~25モル%、さらに好ましくは1~20モル%の量で、およびエチレン由来の構成単位(以下、「エチレン含量」ともいう。)を好ましくは5~30モル%、より好ましくは5~25モル%、さらに好ましくは5~23モル%の量で含有している。
前記プロピレン含量、1-ブテン含量、およびエチレン含量は、13C-NMRによる測定で求めることができる。
軟質プロピレン系共重合体(B)の分子量分布(Mw/Mn)は、好ましくは1.0~3.5、より好ましくは1.5~3.0、さらに好ましくは1.7~2.8の範囲にある。分子量分布(Mw/Mn)を上記範囲内とすることで、本組成物の成形性が良好となる。
軟質プロピレン系共重合体(B)の135℃、デカリン溶媒中で測定される極限粘度[η]は、好ましくは0.01~10dl/g、より好ましくは0.05~5.0dl/g、さらに好ましくは1.0~4.5dl/gである。極限粘度[η]を上記範囲内とすることで、耐候性、耐オゾン性、耐熱老化性、低温特性などの特性に優れる熱可塑性エラストマーを得ることができる。
軟質プロピレン系共重合体(B)の立体規則性は、トリアッドタクティシティ(mm分率)によって評価することができ、好ましくは85%以上、より好ましくは88~98%、さらに好ましくは90~95%である。
軟質プロピレン系共重合体(B)の融解熱量(ΔH)は、好ましくは観測されないか、または50J/g未満である。より好ましくは観測されないか、または45J/g以下、さらに好ましくは観測されないか、または40J/g以下である。本発明の軟質プロピレン系共重合体(B)は、上記範囲を満たすため結晶化度が低い傾向にあり、これを含む熱可塑性エラストマー組成物の透明性に優れる。
本発明に係る結晶性ポリオレフィン(C)は、融点(TmC)が115℃以上である。好ましくは115~175℃であり、より好ましくは118~172℃であり、さらに好ましくは120~170℃である。結晶性ポリオレフィン(C)の融点(Tmc)が前記範囲内にあると、機械物性や耐熱性に優れる組成物および成形体を得ることができる。
本発明に係る結晶性ポリオレフィン(C)の融解熱量(ΔH)は、好ましくは50J/g以上である。より好ましくは60J/g以上であり、さらに好ましくは70J/g以上である。本発明の結晶性ポリオレフィン(C)は、上記範囲を満たすため結晶化度が高い傾向にあり、これを含む熱可塑性エラストマー組成物の機械物性、耐熱性などの物性に優れる。
前記単独重合体としては、通常、エチレン単独重合体、プロピレン単独重合体、1-ブテン単独重合体であり、好ましくはエチレン単独重合体、プロピレン単独重合体であり、さらに好ましくはプロピレン単独重合体である。
適当な原料オレフィンとしては、具体的には、エチレン、プロピレン、1-ブテン、1-ペンテン、1-ヘキセン、1-オクテン、1-デセン、2-メチル-1-プロペン、3-メチル-1-ペンテン、4-メチル-1-ペンテン、5-メチル-1-ヘキセンなどの炭素数2~20のα-オレフィンが挙げられる。炭素数としては、好ましくは2~12、より好ましくは2~6である。
共重合体としては、具体的には、プロピレン・エチレンランダム共重合体、プロピレン・エチレンブロック共重合体、エチレン・1-ブテン共重合体、エチレン・1-ヘキセン共重合体、エチレン・4-メチル-1-ペンテン共重合体が挙げられる。
結晶性ポリオレフィン(C)は、メルトフローレート(MFR:ASTM D 1238-65T、230℃、2.16kg荷重)が、通常0.01~100g/10分、好ましくは0.05~80g/10分の範囲にあることが好ましく、より好ましくは0.5~50g/10min、さらに好ましくは0.5~30g/10minの範囲である。
本組成物は、流動性や硬度の調整等を目的として、軟化剤を用いることが好ましい。
軟化剤の具体例としては、プロセスオイル、潤滑油、パラフィン、流動パラフィン、ポリエチレンワックス、ポリプロピレンワックス、石油アスファルト、ワセリン等の石油系軟化剤;コールタール、コールタールピッチ等のコールタール系軟化剤;ヒマシ油、アマニ油、ナタネ油、大豆油、椰子油等の脂肪油系軟化剤;トール油;サブ(ファクチス);蜜ロウ、カルナウバロウ、ラノリン等のロウ類;リシノール酸、パルミチン酸、ステアリン酸、ステアリン酸バリウム、ステアリン酸カルシウム、ラウリン酸亜鉛等の脂肪酸または脂肪酸塩;ナフテン酸;パイン油、ロジンまたはその誘導体;テルペン樹脂、石油樹脂、クマロンインデン樹脂、アタクチックポリプロピレン等の合成高分子系軟化剤;ジオクチルフタレート、ジオクチルアジペート、ジオクチルセバケート等のエステル系軟化剤;マイクロクリスタリンワックス、液状ポリブタジエン、変性液状ポリブタジエン、液状ポリイソプレン、末端変性ポリイソプレン、水添末端変性ポリイソプレン、液状チオコール、炭化水素系合成潤滑油が挙げられる。
軟化剤は、前述のように、例えば、エチレン・α-オレフィン・非共役ポリエン共重合体(A)と予め混合(油展)したものを用いてもよく、本組成物を調製する際に用いてもよく、本組成物に配合する各成分を動的に熱処理する際に後添加してもよい。
本組成物中の、エチレン・α-オレフィン・非共役ポリエン共重合体(A)を、部分的または完全に架橋したい場合、特に、各成分を配合した未架橋の本組成物を動的架橋する際には、架橋剤(E)を用いることが好ましく、成分の少なくとも一部が架橋された本組成物の調製には、架橋剤(E)を用いる。
有機過酸化物としては、例えば、ジクミルペルオキシド、ジ-tert-ブチルペルオキシド、2,5-ジメチル-2,5-ジ-(tert-ブチルペルオキシ)ヘキサン、2,5-ジメチル-2,5-ジ(tert-ブチルペルオキシ)ヘキシン-3、1,3-ビス(tert-ブチルペルオキシイソプロピル)ベンゼン、1,1-ビス(tert-ブチルペルオキシ)-3,3,5-トリメチルシクロヘキサン、n-ブチル-4,4-ビス(tert-ブチルペルオキシ)バレレート、ベンゾイルペルオキシド、p-クロロベンゾイルペルオキシド、2,4-ジクロロベンゾイルペルオキシド、tert-ブチルペルオキシベンゾエート、tert-ブチルペルベンゾエート、tert-ブチルペルオキシイソプロピルカーボネート、ジアセチルペルオキシド、ラウロイルペルオキシド、tert-ブチルクミルペルオキシドが挙げられる。
≪架橋助剤≫
前記架橋剤(E)を用いる場合、架橋反応の効率を向上する観点から、架橋助剤を用いることが好ましい。
架橋剤(E)として、有機過酸化物を用いる場合、前記架橋助剤としては、例えば、硫黄、p-キノンジオキシム、p,p’-ジベンゾイルキノンジオキシム、N-メチル-N,4-ジニトロソアニリン、ニトロベンゼン、ジフェニルグアニジン、トリメチロールプロパン-N,N’-m-フェニレンジマレイミド、ジビニルベンゼン、トリアリルシアヌレート、ビニルブチラート、ビニルステアレート、エレチングリコールジメタクリレート、ジエチレングリコールジメタクリレート、ポリエチレングリコールジメタクリレート、トリメチロールプロパントリメタクリレート、アリルメタクリレート等のビニルまたはメタクリレートモノマーが挙げられる。
本組成物は、必要に応じ、本発明の目的を損なわない範囲で、成分(A)~成分(E)に加えて、これら以外のその他の重合体または添加剤を含んでもよい。
これらその他の添加剤を用いる場合、その合計量は、前記成分(A)~成分(C)の合計量100質量部に対して、通常0.01~20質量部、好ましくは0.1~10質量部、更に好ましくは0.1~5質量部である。また充填剤については、前記成分(A)100質量部に対して、通常1~50質量部、好ましくは1~45質量部、更に好ましくは1~40質量部である。
非融解型の結晶化核剤としては、タルク、マイカ、シリカ、アルミニウムなどの無機物、臭素化ビフェニルエーテル、アルミニウムヒドロキシジ-p-tert-ブチルベンゾエート(TBBA)、有機リン酸塩、ロジン系結晶化核剤、置換トリエチレングリコールテレフタレート及びTerylene&Nylon繊維などが挙げられ、特にヒドロキシ-ジ-p-tert-ブチル安息香酸アルミニウム、メチレンビス(2,4-ジ-tert-ブチルフェニル)リン酸ナトリウム塩、2,2’-メチレンビス(4,6-ジ-tert-ブチルフェニル)リン酸ナトリウム、ロジン系結晶化核剤が望ましい。
前記充填剤としては、従来公知の充填剤が挙げられ、具体的には、カーボンブラック、炭酸カルシウム、ケイ酸カルシウム、クレー、カオリン、タルク、シリカ、ケイソウ土、雲母粉、アスベスト、アルミナ、硫酸バリウム、硫酸アルミニウム、硫酸カルシウム、塩基性炭酸マグネシウム、二硫化モリブデン、グラファイト、ガラス繊維、ガラス球、シラスバルーン、塩基性硫酸マグネシウムウィスカー、チタン酸カルシウムウィスカー、ホウ酸アルミニウムウィスカーなどから選ばれる1種以上が挙げられる。
本組成物は、エチレン・α-オレフィン・非共役ポリエン共重合体(A)と、軟質プロピレン系共重合体(B)と、結晶性ポリオレフィン(C)と、軟化剤(D)と、架橋剤(E)と、必要により前述のその他の添加剤とを混合・混練することで製造することができる。
動的架橋することによって、エチレン・α-オレフィン・非共役ポリエン共重合体(A)の少なくとも一部が架橋した状態の成分を含む組成物を得ることができる。ここで「少なくとも一部が架橋された」とは、ゲル含量が5~98質量%、好ましくは10~95質量%の範囲内にある場合のことをいう。
動的架橋における加熱温度は、通常125~280℃、好ましくは145~240℃であり、混合・混練時間は、通常1~30分間、好ましくは3~20分間である。
エチレン・α-オレフィン・非共役ポリエン系共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)0~5,000質量部、好ましくは10質量部以上、20質量部以上、25質量部以上、27質量部以上、30質量部以上、4000質量部以下、3000質量部以下、2500質量部以下と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~70質量部と、
架橋剤(E)0.01~10質量部と
を動的架橋して組成物(i)を得る第一工程と、
前記組成物(i)に軟質プロピレン系共重合体(B)0~5,000質量部、好ましくは10質量部以上、20質量部以上、25質量部以上、27質量部以上、30質量部以上、4000質量部以下、3000質量部以下、2500質量部以下を添加する第二工程を有し、
前記第一工程および第二工程で添加される前記軟質プロピレン系共重合体(B)の合計量が、20~5,000質量部であり、
前記軟質プロピレン系共重合体(B)が、さらに下記の要件(b-1)~(b-2)をいずれも満たす、熱可塑性エラストマー組成物の製造方法:
(b-1)プロピレン由来の構成単位を90~50モル%、1-ブテン由来の構成単位を0~30モル%、およびエチレン由来の構成単位を5~30モル%含有する。
(b-2)ゲルパーミエーションクロマトグラフィー(GPC)により求められる分子量分布(Mw/Mn)が1.0~3.5の範囲にある。
本組成物の製造方法においては、第一工程に引き続いて第二工程を行ってもよく、第一工程の後、得られた組成物(i)をペレット化した後に第二工程を行ってもよい。
本組成物は、成形性に優れ、シボ成形などの意匠性が求められる用途に好適に使用することができ、また、透明性にも優れる。
本発明に係る成形体は、本組成物を含めば特に制限されず、用途に応じて、任意の既知の成形法を用いて成形された成形体である。成形法の例としては、例えば、プレス成形、射出成形法、押出成形法、カレンダー成形法、中空成形法、真空成形法、圧縮成形法が挙げられる。本発明に係る成形体は、本組成物のみから成形された成形体であってもよく、また、他素材と組み合わせて成形された成形体であってもよい。また本発明に係る成形体は、単独で用いてもよく、他素材からなる成形体と組み合わせて用いてもよい。
内部ヘイズおよび全光線透過率は具体的には、後述の実施例に記載の方法で測定できる。
自動車内装表皮材としては、具体的には、インストルメントパネル、ドアトリム、アームレスト、またはコンソールが好適に挙げられる。
本発明の熱可塑性エラストマー組成物からなる成形体は、本組成物が成形性に優れるとともに透明性にも優れることから、表示装置または操作部を具備する装飾パネルの表面層として好適に用いることができる。本発明に係る装飾パネルとしては、表示装置または操作部を具備する装飾パネルが挙げられる。
エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)10~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~200質量部と、
架橋剤(E)0.01~10質量部と
を含む熱可塑性エラストマー組成物を含む成形体と、
前記成形体の下部に設けられた表示装置または操作部と、
を備える。
エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)20~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~70質量部と、
架橋剤(E)0.01~10質量部と
を含み、
前記軟質プロピレン系共重合体(B)が、さらに下記の要件(b-1)を満たす。
また好ましくは、前記軟質プロピレン系共重合体(B)が、さらに下記要件(b-2)を満たす。
本発明の装飾パネルは、通常、熱可塑性エラストマー組成物を含む成形体の下部に表示装置または操作部が設けられた構成、すなわち、表示装置または操作部上に、熱可塑性エラストマー組成物を含む成形体が設けられた構成であり、表示装置または操作部が示す表示を、熱可塑性エラストマー組成物を含む成形体を介して視認することができる。
[構成単位の質量分率]
エチレン・α-オレフィン・非共役ポリエン共重合体(A-1)中に含まれる各構成単位の質量分率(質量%)は、13C-NMRによる測定値から求めた。具体的には、ECX400P型核磁気共鳴装置(日本電子(株)製)を用いて、測定温度:120℃、測定溶媒:オルトジクロロベンゼン/重水素化ベンゼン=4/1(体積比)、積算回数:8000回の条件で、共重合体(A-1)の13C-NMRのスペクトルから算出した。
軟質プロピレン系共重合体(B-1)、(B-2)および(B-3)の重量平均分子量(Mw)、数平均分子量(Mn)、および分子量分布(Mw/Mn)は、ゲルパーミエーションクロマトグラフィー(GPC)によりカラム温度140℃で測定した。重量平均分子量(Mw)、数平均分子量(Mn)は、いずれも標準ポリスチレン換算で測定した。Mw/Mnは重量平均分子量(Mw)、数平均分子量(Mn)をもとに算出した。
軟質プロピレン系共重合体(B-1)、(B-2)、(B-3)ならびに結晶性ポリオレフィン(C-1)、(C-2)の融点は、示差走査熱量分析(DSC)により次の方法で求めた。
前記軟質ポリプロピレン(B-1)ならびに(B-2)の極限粘度[η]は、デカリン溶媒を用いて、135℃で測定した値である。
[η]=lim(ηsp/C) (C→0)
実施例および比較例で使用した原料は以下のとおりである。
・油展エチレン・プロピレン・非共役ジエン共重合体ゴム(EPDM、商品名:3072EPM;三井化学(株)製)
・エチレン含量=64質量%、プロピレン含量=30.6質量%、非共役ジエン種:5-エチリデン-2-ノルボルネン、非共役ジエン含量=5.4質量%
・ムーニー粘度[ML(1+4)125℃]=51
エチレン・α-オレフィン・非共役ポリエン共重合体100質量部に対する油展量(質量部)=40(PHR)
なお、表1における共重合体(A-1)の数値は、油展量を除いたゴム成分のみの配合量を示す。共重合体(A-1)の油展には、パラフィン系プロセスオイル(出光興産(株)製の「PW-100」、下記軟化剤)を用いた。
[合成例1] 軟質プロピレン系共重合体(B-1)の調製
触媒/助触媒として、特開2007-186664号公報に記載の方法で調製されたジフェニルメチレン(3-t-ブチル-5-エチルシクロペンタジエニル)(2,7-t-フルオレニル)ジルコニウムジクロリド/メチルアルミノキサン(東ソー・ファインケム社製、アルミニウム換算で0.3mmol)を用いて、原料となるエチレン、プロピレンおよび1-ブテンを、連続重合設備を用いてヘキサン溶液中で重合することでプロピレン・1-ブテン・エチレンランダム共重合体(PBER-1)(プロピレン76モル%、1-ブテン6モル%、エチレン18モル%、融点=観測されず(ΔH=0.5J/g未満))、Mw/Mn=2.1、極限粘度[η]=1.4dl/g)を得た。
触媒/助触媒として、特開2007-186664号公報に記載の方法で調製されたジフェニルメチレン(3-t-ブチル-5-エチルシクロペンタジエニル)(2,7-t-フルオレニル)ジルコニウムジクロリド/メチルアルミノキサン(東ソー・ファインケム社製、アルミニウム換算で0.3mmol)を用いて、原料となるエチレン、プロピレンおよび1-ブテンを、連続重合設備を用いてヘキサン溶液中で重合することでプロピレン・1-ブテン・エチレンランダム共重合体(PBER-1)(プロピレン67モル%、1-ブテン19モル%、エチレン14モル%、融点=観測されず(ΔH=0.5J/g未満)、Mw/Mn=2.1、極限粘度[η]=1.8dl/g)を得た。
・プロピレン・α-オレフィンランダム共重合体(商品名:Vistamaxx6102、エクソン・モービル社製、エチレン含有量=21.4モル% 、融点=105℃、ΔH=10J/g、Mw/Mn=2.1、MFR(230℃、2.16kg荷重)=3.0g/10分)
結晶性ポリオレフィン(C-1)
・プロピレン・エチレンブロック共重合体(商品名:EL-Pro P740J;SCG Chemicals社製、MFR(ASTM D 1238-65Tの測定方法に準拠;230℃、2.16kg荷重)=27g/10分)、融点=163℃、ΔH=93J/g)
結晶性ポリオレフィン(C-2)
・プロピレンホモポリマー(商品名:プライムポリプロ J105;プライムポリマー社製、MFR(ASTM D 1238-65Tの測定方法に準拠;230℃、2.16kg荷重)=5g/10分)、融点=167℃、ΔH=105J/g)
・パラフィン系プロセスオイル(商品名:ダイアナプロセスオイル PW-100、出光興産(株)製)
なお、表1における軟化剤(D-1)の数値は、共重合体の油展に由来する配合量を含む。
・有機ペルオキシド(2,5-ジメチル-2,5-ジ-(tert-ブチルペルオキシ)ヘキサン)、商品名:パーヘキサ25B、日油(株)製)
(6)その他の成分
(6-1)架橋助剤
・ジビニルベンゼン(商品名:DVB-810、日鉄ケミカル&マテリアル(株)製)
共重合体(A)100質量部(油展エチレン・プロピレン・非共役ジエン共重合体ゴム(EPDM、商品名:3072EPM;三井化学(株)製)140質量部)に対し、合成例1で合成した共重合体(B-1)を2000質量部と、結晶性ポリオレフィン(C-1)350質量部と、架橋剤(E-1)を1.0質量部と、架橋助剤としてジビニルベンゼン1.0質量部とをヘンシェルミキサーで十分混合した。押出機(機種名:HYPERKTX-46、(株)神戸製鋼所製、シリンダー温度:C1=110℃、C2=120℃、C3=140℃、C4=140℃、C5=150℃、C6=160℃、C7~C8=180℃、C9~C14=230℃、ダイス温度:200℃)にて軟化剤(D-1)を、共重合体(A)の油展量を含めた量が50質量部となるようにシリンダーに注入しながら造粒を行い、熱可塑性エラストマー組成物のペレットを得た。
使用した原料の配合量を表1に記載の通りに変更した以外は、実施例1と同様の方法で熱可塑性エラストマー組成物のペレットを得た。
使用した共重合体(B-1)を合成例2で合成した共重合体(B-2)に変更し、使用した原料の配合量を表1に記載の通りに変更した以外は、実施例1と同様の方法で熱可塑性エラストマー組成物のペレットを得た。
使用した共重合体(B-1)を共重合体(B-3)に変更し、使用した原料の配合量を表1に記載の通りに変更した以外は、実施例1と同様の方法で熱可塑性エラストマー組成物のペレットを得た。
使用した原料の配合量を表1に記載の通りに変更し、さらに結晶性ポリオレフィン(C-2)を使用した以外は、実施例1と同様の方法で熱可塑性エラストマー組成物のペレットを得た。
共重合体(A)100質量部(油展エチレン・プロピレン・非共役ジエン共重合体ゴム(EPDM、商品名:3072EPM;三井化学(株)製)140質量部)に対し、結晶性ポリオレフィン(C-1)350質量部と、架橋剤(E-1)を1.0質量部と、架橋助剤としてジビニルベンゼン1.0質量部とをヘンシェルミキサーで十分混合した。押出機(機種名:HYPERKTX-46、(株)神戸製鋼所製、シリンダー温度:C1=110℃、C2=120℃、C3=140℃、C4=140℃、C5=150℃、C6=160℃、C7~C8=180℃、C9~C14=230℃、ダイス温度:200℃)にて軟化剤(D-1)を、共重合体(A)の油展量を含めた量が50質量部となるようにシリンダーに注入しながら造粒を行い、熱可塑性エラストマー組成物のペレットを製造した。得られた熱可塑性エラストマー組成物と、合成例1で合成した共重合体(B-1)を2000質量部とを上記押出に従い再度造粒を行い、熱可塑性エラストマー組成物のペレットを得た。
使用した原料の配合量を表1に記載の通りに変更した以外は、実施例12と同様の方法で熱可塑性エラストマー組成物のペレットを得た。
共重合体(B-1)は使用せず、原料の配合量を表1に記載の通りに変更した以外は、実施例1と同様の方法で熱可塑性エラストマー組成物のペレットを得た。
<プレスシートの作製>
実施例および比較例で得られた熱可塑性エラストマー組成物のペレットを、熱プレス成形機にてプレス加工した(プレス温度:190℃、冷却温度:20℃、予熱時間:6分、加圧溶融時間:4分)。プレス加工の結果、各組成物について、厚さの異なる2種類の平板のプレスシートを作製した。得られたプレスシートは、それぞれ、縦12cm×横14.7cm×厚さ2mm、および、縦12cm×横14.7cm×厚さ0.5mmであった。
前記2mm厚のプレスシートを3枚重ねて試験サンプルとして用い、JIS K 6253に記載の方法に準拠して、デュロメータを用いてショアA硬度(瞬間値)を求めた。結果を表1に示す。
JIS K 7210に準拠して230℃、10kg荷重で、実施例および比較例で得られた熱可塑性エラストマー組成物のペレットを用いてメルトフローレートを測定した。結果を表1に示す。
前記2mm厚のプレスシートを打ち抜いて、ダンベル状3号形試験片を作製した。作製した試験片を用いて、JIS K 6251に準拠して引張試験(引張速度:500mm/分、測定温度:23℃)を行い、100%伸張時のモジュラス(M100)、破断時応力(TB)および破断時伸び(EB)を測定した。結果を表1に示す。
前記0.5mm厚のプレスシートを用いて、JIS K 7105に準拠して、ヘイズ値および全光線透過率を測定した。結果を表1に示す。
前記熱可塑性エラストマー組成物ペレットを用いて、Tダイ成形機(東芝機械(株)製、シリンダー温度:C1=160、C2=170、C3=180、C4=190、C5~C6=200℃、D1~D5=200℃、ロール温度:60~80℃、引き取り速度:1.1m/min、回転数:55rpm)により厚み:1.0mmのシートを作成した。
シボ転写性については、目視にて評価を実施した。評点は5点満点とし、評価内容は下記とした。評価人数は3人であり、3人の平均点にて点数を付けた。
5点:成形体のシボが非常に明確に転写されており、シボ転写性に非常に優れる。
4点:成形体のシボが明確に転写されており、シボ転写性に優れる。
3点:成形体のシボが認識可能な程度に転写されており、シボ転写性が良好である。
2点:成形体のシボが一部転写されておらず、シボ転写性が不良である。
1点:成形体のシボが全体的に転写されておらず、シボ転写性が悪い。
前記成型体サンプルのシートのコーナー部におけるコーナー形状の転写性について、目視にて評価を実施した。評点は5点満点とし、評価内容は下記とした。評価人数は3人であり、3人の平均点にて点数を付けた。
5点:成形体のコーナーが非常に明確に転写されており、コーナー転写性に非常に優れる。
4点:成形体のコーナーが明確に転写されており、コーナー転写性に優れる。
3点:成形体のコーナーが認識可能な程度に転写されており、コーナー転写性が良好である。
2点:成形体のコーナーが転写されておらず丸みがあり、コーナー転写性が不良である。
1点:成形体のコーナーが転写されておらず丸まっており、コーナー転写性が悪い。
Claims (13)
- エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)20~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~70質量部と、
架橋剤(E)0.01~10質量部と
を含み、
前記軟質プロピレン系共重合体(B)が、さらに下記の要件(b-1)~(b-2)をいずれも満たす、熱可塑性エラストマー組成物:
(b-1)プロピレン由来の構成単位を90~50モル%、1-ブテン由来の構成単位を0~30モル%、およびエチレン由来の構成単位を5~30モル%含有する。
(b-2)ゲルパーミエーションクロマトグラフィー(GPC)により求められる分子量分布(Mw/Mn)が1.0~3.5の範囲にある。 - 前記架橋剤(E)が有機過酸化物である、請求項1に記載の熱可塑性エラストマー組成物。
- メルトフローレート(JIS K 7210の測定方法に準拠、230℃、10kg荷重)が1g/10分以上、80g/10分未満である、請求項1または2に記載の熱可塑性エラストマー組成物。
- エチレン・α-オレフィン・非共役ポリエン共重合体(A)の少なくとも一部が架橋している、請求項1または2に記載の熱可塑性エラストマー組成物。
- ショアA硬度(瞬間値)(JIS K 6253の測定方法に準拠、厚さ2mmのシートを3枚重ねて用いる)が、40~100である、請求項1または2に記載の熱可塑性エラストマー組成物。
- 請求項1または2に記載の熱可塑性エラストマー組成物を含む、成形体。
- 内部ヘイズが80%以下である、請求項6に記載の成形体。
- 全光線透過率が83%以上である、請求項6に記載の成形体。
- 自動車内装表皮材である、請求項6に記載の成形体。
- 前記自動車内装表皮材がインストルメントパネル、ドアトリム、アームレストまたはコンソールである請求項9に記載の成形体。
- エチレン・α-オレフィン・非共役ポリエン共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)10~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~200質量部と、
架橋剤(E)0.01~10質量部と
を含む熱可塑性エラストマー組成物を含む成形体と、
前記成形体の下部に設けられた表示装置または操作部と、
を備えることを特徴とする、装飾パネル。 - 熱可塑性エラストマー組成物の製造方法であって、前記製造方法が、
エチレン・α-オレフィン・非共役ポリエン系共重合体(A)100質量部と、
融点(TmB)が観測されないか、または115℃未満である、軟質プロピレン系共重合体(B)0~5,000質量部と、
融点(TmC)が115℃以上である、結晶性ポリオレフィン(C)10~500質量部と、
軟化剤(D)0~70質量部と、
架橋剤(E)0.01~10質量部と
を動的架橋して組成物(i)を得る第一工程と、
前記組成物(i)に軟質プロピレン系共重合体(B)0~5,000質量部を添加する第二工程を有し、
前記第一工程および第二工程で添加される前記軟質プロピレン系共重合体(B)の合計量が、20~5,000質量部であり、
前記軟質プロピレン系共重合体(B)が、さらに下記の要件(b-1)~(b-2)をいずれも満たす、熱可塑性エラストマー組成物の製造方法:
(b-1)プロピレン由来の構成単位を90~50モル%、1-ブテン由来の構成単位を0~30モル%、およびエチレン由来の構成単位を5~30モル%含有する。
(b-2)ゲルパーミエーションクロマトグラフィー(GPC)により求められる分子量分布(Mw/Mn)が1.0~3.5の範囲にある。 - 前記第一工程で添加される前記軟質プロピレン系共重合体(B)の量が、0質量部である、請求項12に記載の熱可塑性エラストマー組成物の製造方法。
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