KR102187968B1 - Olefinic Elastomer Composition And Molded Articles Comprising Thereof - Google Patents

Abstract

The present invention (a) a propylene-based polymer having a melt index (2.16kg, 230°C) of 0.5 to 100 g/10 minutes; (b) ethylene-propylene copolymer comprising 50 to 75% by weight of ethylene-derived units; (c) an ethylene-alphaolefin copolymer having a melt index (2.16 kg, 230° C.) of 0.5 to 30 g/10 minutes and a density of 0.85 to 0.91 g/cm ³ ; (d) Styrene polymer rubber; And (e) provides an olefin-based elastomer composition comprising a thermoplastic vulcanized rubber (TPV) and a molded article comprising the same.

Description

Olefinic Elastomer Composition And Molded Articles Comprising Thereof

The present invention relates to an olefin-based elastomer composition and a molded article comprising the same.

The airbag cover is a typical automobile safety component, and thermoplastic polyelastomer (TPE) resin is mainly applied. The TPE is largely classified into styrene-based, urethane-based, ester-based, and olefin-based.

Olefin-based TPE resins are mainly developed and mass-produced in order to meet the requirements of each temperature condition-use environment, such as an air bag cover, which is generally a combination of polypropylene copolymer, ethylene-propylene rubber, and polyolefin elastomer Done.

However, flexible segments such as rubber have a problem in that it is difficult to maintain physical properties such as low-temperature impact characteristics, tear resistance and stiffness at high temperatures.

On the other hand, it is divided into crosslinked and non-crosslinked types depending on whether or not the flexible segments are crosslinked.The crosslinked type has excellent heat resistance, chemical resistance, and elasticity, but has a problem of cost increase, and control of volatile organic compounds (VOCs), Several problems arise in the control of further processes and reactions.

VOCs are liquid or gaseous organic compounds that are easily evaporated into the atmosphere due to high vapor pressure among organic hydrocarbon compounds. A measure for evaluating indoor air quality such as automobiles based on the concept of types and total amounts of substances that are meaningful for the environment, health, and health within the TVOC (Total Volatile Organic Compounds), VVOC (Very Volatile Organic Compounds), VOCs and SVOC (Semivolatile Organic Compounds) groups. Can be used as. Accordingly, there is a need to develop an eco-friendly olefin-based elastomer composition capable of implementing low VOCs levels that can be used in the manufacture of automotive interior safety parts and the like.

Thus, the present inventors added a styrene-based polymer rubber and a thermoplastic vulcanized rubber (TPV) to an olefin-based elastomer composition comprising a polypropylene copolymer, an ethylene-propylene copolymer, and an ethylene-alphaolefin copolymer, so that a crosslinking agent was not separately added. It was confirmed that the low-temperature impact properties were maintained and the tear resistance and rigidity were improved at high temperatures, and the present invention was completed.

An object of the present invention is to provide an eco-friendly olefin-based elastomer composition by maintaining a low VOCs level as a non-crosslinked type, as well as excellent low-temperature impact properties, improved tear resistance and rigidity at high temperatures.

In addition, an object of the present invention is to provide a molded article having excellent low-temperature impact properties, high temperature tear resistance, and stiffness, including the olefin-based elastomer composition.

One embodiment of the present invention

(a) a propylene polymer having a melt index (2.16kg, 230°C) of 0.5 to 100 g/10 minutes;

(b) ethylene-propylene copolymer comprising 50 to 75% by weight of ethylene-derived units;

(c) an ethylene-alphaolefin copolymer having a melt index (2.16 kg, 230° C.) of 0.5 to 30 g/10 minutes and a density of 0.85 to 0.91 g/cm ³ ;

(d) Styrene polymer rubber; And

(e) It provides an olefin-based elastomer composition comprising a thermoplastic vulcanized rubber (TPV).

Another embodiment of the present invention is based on a total of 100 parts by weight of the olefin-based elastomer composition

(a) 50 to 60 parts by weight of a propylene polymer having a melt index (2.16 kg, 230° C.) of 0.5 to 100 g/10 minutes;

(b) 5 to 25 parts by weight of an ethylene-propylene copolymer containing 50 to 75% by weight of ethylene-derived units;

(c) The melt index (2.16kg, 230°C) is 0.5 to 30 g/10 minutes, the density is 0.85 to 0.91 g/cm ³ , and the ratio of the melt index measured at 190° C. MFR ₁₀ / MFR _2.16 is 8.5 or less. , 5 to 25 parts by weight of an ethylene-alphaolefin copolymer having a vinyl group content of 0.06 to 1 per 1000 carbon atoms determined by infrared absorption measurement;

(d) 3 to 25 parts by weight of a styrenic polymer rubber; And

(e) It provides an olefin-based elastomer composition comprising 3 to 10 parts by weight of a thermoplastic vulcanized rubber (TPV).

Another embodiment of the present invention provides a molded article comprising the olefin-based elastomer composition.

The olefin-based elastomer composition according to the present invention is a non-crosslinked type that does not use a separate crosslinking agent and is eco-friendly by maintaining a low level of VOCs, and has improved low-temperature impact properties, tear resistance and stiffness at a high temperature equivalent to or higher than that of the crosslinking type. Can be indicated.

Hereinafter, the present invention will be described in more detail to aid understanding of the present invention.

The terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that there is.

One embodiment of the present invention

(a) a propylene polymer having a melt index (2.16kg, 230°C) of 0.5 to 100 g/10 minutes;

(b) ethylene-propylene copolymer comprising 50 to 75% by weight of ethylene-derived units;

(c) an ethylene-alphaolefin copolymer having a melt index (2.16 kg, 230° C.) of 0.5 to 30 g/10 minutes and a density of 0.85 to 0.91 g/cm ³ ;

(d) Styrene polymer rubber; And

(e) It provides an olefin-based elastomer composition comprising a thermoplastic vulcanized rubber (TPV).

As an example, the olefin-based elastomer composition may include (a) 50 to 60 parts by weight of a propylene-based polymer based on a total of 100 parts by weight of the olefin-based elastomer composition; (B) 5 to 25 parts by weight of an ethylene-propylene copolymer; (C) 5 to 25 parts by weight of an ethylene-alphaolefin copolymer; (D) styrene polymer rubber 3 to 25 parts by weight; And 3 to 10 parts by weight of the (e) thermoplastic vulcanized rubber (TPV). As a result, it is possible to achieve low-temperature impact properties and high-temperature tear resistance without including a crosslinking agent.

Hereinafter, each component of this invention is described in more detail.

(a) propylene polymer

The (a) propylene-based polymer may be one or more selected from the group consisting of a homopolymer, a block or random copolymer, a random terpolymer, and a mixture thereof. Preferably, a block copolymer is used.

The (a) propylene polymer has a melt index (2.16kg, 230°C) measured according to ASTM D1238 of 0.5 to 100 g/10 minutes, preferably 5 to 45 g/10 minutes, more preferably 5 to 30 g/10 minutes. The flowability of the olefin-based elastomer composition can be improved by using a highly crystalline, high-flowing propylene-based polymer satisfying the above numerical range.

Specifically, the (a) propylene-based polymer may be included in an amount of 50 to 60 parts by weight, preferably 52 to 58 parts by weight, based on a total of 100 parts by weight of the olefin-based elastomer composition. It is possible to maintain excellent low-temperature impact properties and high-temperature tear resistance within the above numerical range, and the level of VOCs is controlled.

(b) ethylene-propylene copolymer

The (b) ethylene-propylene copolymer refers to a synthetic rubber in which ethylene, propylene and optionally non-conjugated polyene are polymerized.

The non-conjugated polyene may be selected from the group consisting of 1,4-hexadiene (HD), dicyclopentadiene (DCP), and ethylidene norbornene (ENB), and ethylidene norbornene (ENB) is most preferred. Do.

The (b) ethylene-propylene copolymer contains 2 to 10% by weight, preferably 4.5 to 7% by weight, more preferably 4.5 to 7% by weight of the unit derived from ethylidene norbornene (ENB) based on the total weight of the (b) copolymer. It may contain 5.7% by weight.

As an example, in the case of EPDM in which the (b) ethylene-propylene copolymer contains a unit derived from ethylidene norbornene (ENB), the Mooney viscosity at 125°C (ML ₁₊₄ , 125°C) is in the range of 23 to 115 And preferably 40 to 90, more preferably 50 to 85.

For example, in the case of EPM in which the (b) ethylene-propylene copolymer does not contain a unit derived from ethylidene norbornene (ENB), the Mooney viscosity at 100°C (ML ₁₊₄ , 100°C) is 25 to 75 It may be in the range, preferably 40 to 70, more preferably 65 to 69.

The content of ethylene-derived units contained in the (b) ethylene-propylene copolymer is 50 to 75% by weight, preferably 57 to 71% by weight, based on the total weight of the (b) copolymer. If the content is less than 50% by weight, the impact resistance may be insignificant, and if it exceeds 75% by weight, the viscosity of the copolymer may be excessively increased.

In addition, the (b) ethylene-propylene copolymer may be included in an amount of 5 to 25 parts by weight, preferably 10 to 20 parts by weight, based on a total of 100 parts by weight of the olefin-based elastomer composition. It is possible to maintain excellent low-temperature impact properties and high-temperature tear resistance within the above numerical range, and the level of VOCs is controlled.

(c) ethylene-alphaolefin copolymer

In the (c) ethylene-alpha olefin copolymer, the alpha olefin may be at least one selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene 4-methyl-1-pentene, and 1-octene, It is more preferable that it is 1-butene or 1-octene.

The (c) ethylene-alphaolefin copolymer has a vinyl group content of 0.06 to 1, preferably 0.06 to 0.8, more preferably 0.06 to 0.5, and more preferably 0.06 to 0.2 per 1000 carbon atoms. In the present invention, the vinyl group content in the polymer is measured by infrared absorption measurement (IR method).

In the present specification, the quantification of the vinyl group is: (1) Infrared by preparing a mixed sample using polyethylene not containing vinyl and vinylidene-type unsaturated bonds, and 1,2-polybutadiene with a known vinyl group content. It can be determined by performing absorption measurement to prepare a calibration curve, (2) performing infrared absorption measurement on a measurement sample, and (3) quantifying by calculation. In addition, the absence of vinyl and vinylidene-type unsaturated bonds can be confirmed by infrared absorption measurement that no absorption band is recognized in the region between 1000 cm ^-1 and 850 cm ^-1 .

The (c) ethylene-alphaolefin copolymer has a melt index (2.16kg, 230°C) measured by ASTM D1238 of 0.5 to 30 g/10 min, preferably 2 to 10 g/10 min. By using the ethylene-alphaolefin copolymer satisfying the above numerical range, the dispersibility of the (c) copolymer in the (a) propylene polymer may be improved, and the flowability of the olefin-based elastomer composition may be improved.

In addition, the density of the (c) ethylene-alphaolefin copolymer is 0.85 to 0.91 g/cm ³ , and it is preferable that it is 0.851 to 0.871 g/cm ³ . If the density is less than 0.85, there is a problem in rigidity at room temperature and high temperature, and if it exceeds 0.91 g/cm ³ , there is a concern that impact resistance is deteriorated.

By using a low-density, high-flow ethylene-alpha olefin that satisfies the above numerical range, compatibility with the propylene-based polymer can be improved, and excellent low-temperature impact can be exhibited at a lower glass transition temperature (Tg).

In addition, it is preferable that MFR ₁₀ / MFR _{2.16, which} is the ratio of the melt index measured at 10 kg load and 190°C according to ASTM D1238 and the melt index measured at 2.16 kg load and 190°C, is 8.5 or less according to ASTM D1238 It is more preferably 4 to 8.

In addition, the (c) ethylene-alphaolefin copolymer may have a Mooney viscosity (ML ₁₊₄ ,121°C) of 5 to 45, preferably 8 to 23, and more preferably 20 to 23. When the above numerical range is satisfied, dispersibility in the propylene-based polymer can be improved.

In addition, the (c) ethylene-alpha olefin copolymer may be included in an amount of 5 to 25 parts by weight based on a total of 100 parts by weight of the olefin-based elastomer composition, and more preferably 12 to 24 parts by weight. It is possible to maintain excellent low-temperature impact properties and high-temperature tear resistance within the above numerical range, and the level of VOCs is controlled.

(d) Styrenic polymer rubber

The (d) styrenic polymer rubber may have a linear structure or a nonlinear structure such as diblock, triblock, radial, star, and the like.

The styrenic polymer rubber is a styrene polymer block group; And a single polymer block group comprising a unit derived from a monomer selected from ethylene, isoprene, butylene, butadiene and propylene, or a copolymer block comprising a unit derived from two or more monomers selected from ethylene, isoprene, butylene, butadiene and propylene It may include a group.

As an example, the styrenic polymer rubber is 5 to 40% by weight, preferably 28 to 35% by weight of the styrene polymer block group based on the total weight of the styrenic polymer rubber; And 60 to 95% by weight, preferably 65 to 72% by weight of the homopolymer block group or the copolymer block group.

Specifically, as the (d) styrene polymer rubber, styrene-butadiene-styrene (SBS) or styrene-ethylene/butylene-styrene (SEBS) may be used.

The density of the (d) styrene-based polymer rubber may be 0.91 to 0.96 g/cm ³ , preferably 0.93 to 0.95 g/cm ³ . When the above numerical range is satisfied, a balance between low-temperature impact characteristics and high-temperature tear resistance can be maintained.

The (d) styrenic polymer rubber may have a Shore hardness A of 60 to 90, preferably 74 to 84.

In addition, the (d) styrene-based polymer rubber may be included in an amount of 3 to 25 parts by weight based on a total of 100 parts by weight of the olefin-based elastomer composition, and more preferably 5 to 20 parts by weight. When the content of the styrene-based polymer rubber is adjusted within the above range, low-temperature impact properties and high-temperature tear resistance can be improved.

(e) Thermoplastic Vulcanized Rubber (TPV)

The (e) thermoplastic vulcanized rubber (TPV) is a kind of thermoplastic elastomer comprising a blend of a (semi) crystalline polyolefin resin and a rubber dispersed in the resin. Since this is a material that has already been crosslinked, it is advantageous in terms of environment, cost, and workability, since a separate crosslinking agent injection process can be omitted when using it. In addition, there is an effect of improving the tear resistance of the olefin-based elastomer composition at room temperature and high temperature. The (e) thermoplastic vulcanized rubber (TPV) may include 15 to 85 parts by weight of a polyolefin resin and 85 to 15 parts by weight of a rubber.

In the TPV, the dispersed rubber is at least partially cured, ie vulcanized. In general, the rubber of TPV has a degree of vulcanization such that the amount of rubber extractable from the TPV (based on the total amount of curable rubber) is less than 90%. Tests to determine such extractable amounts are typically carried out using solvents in which polyolefins and non-vulcanized rubbers are soluble. A suitable and preferred solvent is xylene.

In order to achieve the best vulcanization effect, the TPV is preferably vulcanized to the extent that the amount of extractable rubber is less than 15%, more preferably less than 5%.

The density of the (e) thermoplastic vulcanized rubber (TPV) may be 0.95 to 0.97 g/cm ³ . When the above numerical range is satisfied, a balance between low-temperature impact characteristics and high-temperature tear resistance can be maintained.

The (e) thermoplastic vulcanized rubber may have a Shore hardness A of 32 to 92, preferably 65 to 89. In addition, the Shore hardness D may be 35 to 45.

In addition, the (e) thermoplastic vulcanized rubber (TPV) may be included in an amount of 3 to 10 parts by weight based on a total of 100 parts by weight of the olefin-based elastomer composition, preferably 3 to 7 parts by weight. When the content of the thermoplastic vulcanized rubber is adjusted within the above range, it is possible to improve low-temperature impact properties and high-temperature tear resistance.

Olefin elastomer composition

The components (a) to (e) can be melt-kneaded to obtain an olefin-based elastomer composition in powder or pellet form, and the olefin-based elastomer composition of the present invention has excellent low-temperature impact properties, high-temperature tear resistance, and stiffness. do.

Specifically, the olefin-based elastomer composition of the present invention may not be broken when a force of 50 to 80 kJ/m ² , preferably 65 to 75 kJ/m ² is applied at -40°C according to ISO 180.

In addition, the olefin-based elastomer composition of the present invention may have a tear strength of 50 to 70 N/mm at 85° C. measured according to ISO 34-1.

In addition, the olefin-based elastomer composition of the present invention may have a VOCs value of 20 to 100 μg/g measured according to VDA278.

The olefin-based elastomer composition may be used as a lubricant, antioxidant, chain extender, catalyst, release agent, pigment, dye, antistatic agent, antibacterial agent, processing aid, metal deactivator, smoke suppressant, anti-friction agent, anti-wear agent and coupling agent as needed. It may further include one or more additives selected from the group consisting of. As an example, the additive may be used within a range that does not adversely affect the physical properties of the olefin-based elastomer composition of the present invention.

Another embodiment of the present invention provides an injection molded article made of the olefin-based elastomer composition.

The injection molding method may use a conventional method used in the art without limitation. For example, the powdered or pelletized resin of the olefin-based elastomer is injected into an injection machine through an injection port. The injected resin is heated and melted in the barrel of the injection machine. The melt is injected into the mold at high pressure, and when the polymer melt injected into the mold is solidified by cooling or crosslinking, the mold is opened, and the molded product can be separated from the mold.

The injection-molded product is not particularly limited, and products requiring low temperature impact properties, tear resistance and rigidity at high temperatures can be manufactured.

Example

Examples 1 to 4 and Comparative Examples 1 to 6

Components (a) to (e) shown in Table 1 below were mixed in the amounts described therein to obtain olefinic elastomer compositions of Examples 1 to 3 and Comparative Examples 1 to 6.

* (a) Propylene polymer: A block copolymer having a melt index (2.16kg, 230℃) of 30g/10min measured according to ASTM D1238

* (b) Ethylene-propylene copolymer: EPM copolymer having an ethylene content of 71% by weight and a Mooney viscosity (ML ₁₊ 4,100℃) of 69

* (c) Ethylene-alphaolefin copolymer: EBR copolymer with a melt index (2.16kg, 190℃) of 1.2g/10min and a density of 0.862g/cm ³ measured according to ASTM D1238

* (d) Styrene-based polymer rubber: SEBS polymer rubber of a linear structure containing 13% by weight of styrene polymer (G-1657 from Kraton)

* (e) Thermoplastic vulcanized rubber (TPV): Thermoplastic vulcanized rubber with a shore hardness of 65A (1640N by Kumho Polychem)

* Crosslinking agent: Dicumyl peroxide (crystalline) type crosslinking agent (AkzoNobel's perkadox BC-FF)

Example Comparative example One 2 3 4 One 2 3 4 5 6 (a) 55 50 52 60 45 54.2 52 64.5 70 50 (b) 20 20 10 5 5 12 30 35 - 15 (c) 15 20 24 5 50 26 5 - - 25 (d) 3 5 11 20 - 7 12 - 15 10 (e) 7 5 3 10 - - - - 15 - Crosslinking agent - - - - - 0.8 One 0.5 - -

Experimental example

The olefin-based elastomer composition prepared in the above Examples and Comparative Examples was melt-kneaded at a temperature range of 190 to 250°C using a twin-screw extruder to prepare pellets, and the pellets were tested for physical properties. Was used as. The physical property evaluation of the prepared specimens was measured by the following method, and the evaluation results are shown in Table 2 below.

1) Low-temperature impact: A 4mm-thick, 10mm-wide impact specimen was cooled to -40°C with a weight of 6J and then aged for 4 hours to evaluate the low-temperature impact characteristics under the conditions in the chamber. (NB refers to partial cracking, PB refers to more than half crack, and B refers to the separation of two pieces of specimen, indicating the state of the specimen after impact.)

2) Tear strength: A 3mm-thick specimen was aged for 4 hours after reaching the temperature conditions of room temperature (23°C) and high temperature (85°C) to measure the tear strength in the chamber conditions.

3) Property retention: High temperature tear value / Room temperature tear value × 100

4) VOCs: Purge & trap GC/MS was measured at 90° C. for 30 minutes according to VDA 278.

Example Comparative example One 2 3 4 One 2 3 4 5 6 Low temperature shock
(kJ/m ² ) 65
(NB) 70
(NB) 72
(NB) 55
(PB) 80
(NB) 20
(B) 75
(NB) 55
(PB) 10
(B) 75
(NB) Tear strength
(N/mm) 23℃ 122 114 104 127 73 116 87 114 105 101 85℃ 67 58 53 69 29 45 39 52 47 51 Property retention rate (%) 55 51 50 54 40 39 45 46 45 50 VOCs(㎍/g) 56 43 66 98 31 198 256 173 102 22

In Table 2, the olefin-based elastomer composition of the present invention has relatively excellent low-temperature impact properties and excellent tear resistance at high temperatures, while VOCs exhibited low values, whereas Comparative Example 1 not including (d) and (e) In the case of, it can be seen that the high temperature tear resistance is lowered.

In addition, Comparative Examples 2 and 3 are crosslinked types prepared including a crosslinking agent, but do not include (e), and have poor high-temperature tear resistance and very high levels of VOCs. In particular, since Comparative Example 2 contains very little (b), it can be seen that low-temperature impact properties are also lowered, and physical property retention is also low.

In addition, in the case of Comparative Example 4, which does not include (c), (d) and (e) as a crosslinking type, it can be seen that the low-temperature impact properties and high-temperature tear resistance are poor, and the VOCs level is high.

Comparative Examples 5 and 6 are non-crosslinked types including (d). Since Comparative Example 5 does not contain the components (b) and (c), the low-temperature impact properties are greatly deteriorated, and the high-temperature tear resistance is also not high. In addition, since Comparative Example 6 does not contain the component (e) of the present invention, it can be seen that high temperature tear resistance and physical property retention are not good.

Claims (16)

Based on a total of 100 parts by weight of the olefin-based elastomer composition,
(a) 52 to 58 parts by weight of a propylene polymer having a melt index (2.16 kg, 230° C.) of 0.5 to 100 g/10 minutes;
(b) 10 to 20 parts by weight of an ethylene-propylene copolymer containing 50 to 75% by weight of ethylene-derived units;
(c) 12 to 24 parts by weight of an ethylene-alphaolefin copolymer having a melt index (2.16 kg, 230° C.) of 0.5 to 30 g/10 minutes and a density of 0.85 to 0.91 g/cm ³ ;
(d) 3 to 25 parts by weight of a styrenic polymer rubber; And
(e) An olefin-based elastomer composition comprising 3 to 7 parts by weight of a thermoplastic vulcanized rubber (TPV).
delete The method of claim 1,
The (a) propylene-based polymer is an olefin-based elastomer composition, characterized in that at least one selected from the group consisting of a homopolymer, a block or random copolymer, a random terpolymer, and a mixture thereof.
The method of claim 1,
The (b) ethylene-propylene copolymer includes a unit derived from ethylene and a unit derived from propylene, but does not include a unit derived from ethylidene norbornene (ENB), and has a Mooney viscosity (ML ₁₊₄₎ at 100°C. , 100 ℃) is an olefin-based elastomer composition, characterized in that in the range of 25 to 75.
The method of claim 1,
The (b) ethylene-propylene copolymer is an olefin-based elastomer composition comprising a unit derived from ethylene, a unit derived from propylene, and a unit derived from ethylidene norbornene (ENB).
The method of claim 5,
The (b) ethylene-propylene copolymer (b) contains 2 to 10% by weight of the derived unit of ethylidene norbornene (ENB) based on the total weight of the copolymer, and the Mooney viscosity at 125°C (ML ₁₊₄ , 125°C) is an olefin-based elastomer composition in the range of 23 to 115.
The method of claim 1,
The alpha olefin of (c) is an olefin-based elastomer composition, characterized in that at least one selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene 4-methyl-1-pentene and 1-octene.
The method of claim 1,
The (c) ethylene-alphaolefin copolymer has an olefinic elastomer composition having a vinyl group content of 0.06 to 1 per 1000 carbon atoms determined by infrared absorption measurement.
The method of claim 1,
The (c) ethylene-alphaolefin copolymer has an olefin-based elastomer composition having a melt index ratio of MFR ₁₀ /MFR _2.16 measured at 190°C of 8.5 or less.
The method of claim 1,
The (d) styrenic polymer rubber is based on the total weight of the styrenic polymer rubber
5 to 40% by weight of styrene polymer block group; And
A single polymer block group containing a unit derived from a monomer selected from the group consisting of ethylene, isoprene, butylene, butadiene and propylene, or a unit derived from two or more monomers selected from the group consisting of ethylene, isoprene, butylene, butadiene and propylene. Olefin-based elastomer composition comprising 60 to 95% by weight of the containing copolymer block group.
The method of claim 1,
The (e) thermoplastic vulcanized rubber (TPV) includes a polyolefin resin and a rubber in a weight ratio of 15:85 to 85:15.
The method of claim 1,
Olefin-based elastomer composition, characterized in that it does not break when a force of 50 to 80 kJ/m ² is applied at -40°C according to ISO 180.
The method of claim 1,
An olefin-based elastomer composition, characterized in that the tear strength at 85° C. measured according to ISO34-1 is 50 to 70 N/mm.
The method of claim 1,
An olefin-based elastomer composition, characterized in that the VOCs value measured according to VDA278 is 20 to 100 μg/g.
Based on 100 parts by weight of the total olefin elastomer composition
(a) 52 to 58 parts by weight of a propylene polymer having a melt index (2.16 kg, 230° C.) of 0.5 to 100 g/10 minutes;
(b) 10 to 20 parts by weight of an ethylene-propylene copolymer containing 50 to 75% by weight of ethylene-derived units;
(c) The melt index (2.16kg, 230°C) is 0.5 to 30 g/10 minutes, the density is 0.85 to 0.91 g/cm ³ , and the ratio of the melt index measured at 190° C. MFR ₁₀ / MFR _2.16 is 8.5 or less. , 12 to 24 parts by weight of an ethylene-alphaolefin copolymer having a vinyl group content of 0.06 to 1 per 1000 carbon atoms determined by infrared absorption measurement;
(d) 3 to 25 parts by weight of a styrenic polymer rubber; And
(e) An olefin-based elastomer composition comprising 3 to 7 parts by weight of a thermoplastic vulcanized rubber (TPV).
A molded article comprising the olefin-based elastomer composition of any one of claims 1 and 3 to 15.