JP2000071276A - Injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding having predominant environmental deterioration resistance, wear resistance, durability and mechanical strength and excellent sense of touch (flexibility). SOLUTION: The injection molding comprises a partly or completely crosslinked composition containing (A) 1 to 99 pts.wt. of an ethylene-α-olefin copolymer manufactured of ethylene and 6-12C α-olefin by using a metallocene catalyst, (B) 1 to 99 pts.wt. of propylene resin [a total amount of (A) and (B) is 100 pts.wt.] in such a manner that a crosslinking degree of the (A) ethylene-α- olefin copolymer is 50% or more and a swelling degree is 5 to 40%. A weight ratio of the 6-12C α-olefin occupying in the ethylene-α-olefin copolymer is 30 to 60 wt.%, and a density of the (A) ethylene-α-olefin copolymer is 0.80 to 0.86.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molded product. More specifically, excellent environmental degradation resistance,
The present invention relates to an injection-molded article having abrasion resistance, durability and mechanical strength, and having an excellent tactile sensation (flexibility).

[0002]

2. Description of the Related Art Injection molded products have been widely used as home electric parts, automobile exterior parts, housing / building material parts and the like. However, soft injection-molded articles have a soft and good tactile sensation, but have low mechanical strength, whereas hard injection-molded articles have a poor tactile sensation (flexibility), which is problematic. Therefore, in addition to the above characteristics, resistance to environmental degradation,
The emergence of an injection-molded product that satisfies wear resistance and durability is expected.

[0003] To solve these problems, a dynamically crosslinked olefin elastomer injection molded article having a specific coefficient of linear expansion, molding shrinkage, and flexural modulus (Japanese Patent No. 2720403).
Gazette). The material of the above publication has no specific cross-linked structure, so that it has abrasion resistance or durability,
In particular, the compression set (C-Set) is inferior, and the industry demands an injection molded product that can withstand practical use.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention does not have the above-mentioned problems, that is, it has environmental degradation resistance, abrasion resistance, durability, mechanical strength, and tactile sensation. It is an object to provide an injection molded article having excellent (flexibility).

[0005]

Means for Solving the Problems The present inventors have intensively studied injection-molded articles excellent in tactile sensation (flexibility), resistance to environmental degradation, durability and mechanical strength. Surprisingly, by using an olefin-based elastomer having a specific structure comprising, as an essential component, abrasion resistance, durability and mechanical strength while maintaining environmental deterioration resistance and tactile sensation (flexibility). Has been found to be dramatically improved, and the present invention has been completed.

That is, the present invention relates to (A) ethylene and a compound having 6 carbon atoms.
Ethylene-α-olefin copolymers 1 to 12 produced from metallocene catalysts
99 parts by weight and (B) 1 to 99 parts by weight of the propylene-based resin [the total amount of (A) and (B) is 100 parts by weight], and (A) the degree of crosslinking of the ethylene / α-olefin copolymer is Injection molded article comprising a partially or completely crosslinked composition having a swelling degree of 50% or more and a swelling degree of 5 to 40%, particularly (A) an ethylene / α-olefin copolymer having 6 carbon atoms in the copolymer. The weight ratio of the α-olefin of (a) to (c) is 30 to 60% by weight;
An injection molded article having an olefin copolymer density of 0.80 to 0.86.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The injection molded article of the present invention is obtained by molding a partially or completely crosslinked composition comprising (A) a specific ethylene / α-olefin copolymer and (B) a propylene resin.

Here, (A) the ethylene / α-olefin copolymer is preferably a metallocene-based catalyst or α-olefin copolymer.
It is important that the olefin has 6 to 12 carbon atoms, and by using such an ethylene / α-olefin copolymer (A), excellent tactile sensation (flexibility), environmental degradation resistance, and wear resistance are obtained. , Durability and mechanical strength.

Hereinafter, each component of the present invention will be described in detail.

(A) The ethylene / α-olefin copolymer is an ethylene / α-olefin copolymer comprising an α-olefin having 6 to 12 carbon atoms.

Examples of the α-olefin having 6 to 12 carbon atoms include hexene-1, 4-methylpentene-1,
Heptene-1, octene-1, nonene-1, decene-
1, undecene-1, dodecene-1 and the like. Among them, hexene-1, 4-methylpentene-1 and octene-1 are preferred, and octene-1 is particularly preferred.
Octene-1 is excellent in softening effect even in a small amount, and the obtained copolymer is excellent in mechanical strength.

(A) The ethylene / α-olefin copolymer is produced using a known metallocene catalyst. Generally, a metallocene-based catalyst is an IV such as titanium or zirconium.
Consisting of a cyclopentadienyl derivative of a group metal and a co-catalyst, it is not only highly active as a polymerization catalyst, but also has a narrower molecular weight distribution of the resulting polymer compared to a Ziegler-based catalyst. Α having a carbon number of 6 to 12
The olefin distribution is uniform;

(A) The ethylene / α-olefin copolymer preferably has an α-olefin copolymerization ratio of 1 to 60% by weight, more preferably 20 to 60% by weight,
Most preferably, it is 30 to 60% by weight. If the copolymerization ratio of the α-olefin exceeds 60% by weight, the hardness and tensile strength of the composition tend to decrease, while if it is less than 1% by weight, the mechanical strength tends to decrease.

[0015] The density of (A) an ethylene · alpha-olefin copolymer, preferably in the range of 0.8 to 0.9 g / cm ^3, further in the range of 0.80~0.86g / cm ³ Preferably, there is.

(A) The ethylene / α-olefin copolymer preferably has a long chain branch. The presence of the long-chain branch enables the density to be lower than the ratio (% by weight) of the copolymerized α-olefin without lowering the mechanical strength. hardness,
A high-strength elastomer can be obtained. The olefin elastomer having a long chain branch is described in US Pat. No. 5,278,272 and the like.

The (A) ethylene / α-olefin copolymer preferably has a DSC melting point peak at room temperature or higher. When it has a melting point peak, the form is stable in the temperature range below the melting point, the handleability is excellent, and the stickiness is small.

The melt index of (A) the ethylene / α-olefin copolymer is 0.01 to 100 g /
Those having a range of 10 minutes (190 ° C., 2.16 kg load) are preferably used, and more preferably 0.2 to 10 g / 1.
0 minutes. If the amount exceeds 100 g / 10 minutes, the crosslinking property of the thermoplastic elastomer composition tends to be insufficient,
If it is less than 0.01 g / 10 minutes, the fluidity is poor, and the processability tends to decrease.

As the (A) ethylene / α-olefin copolymer, a plurality of types may be mixed and used. In such a case, it is possible to further improve the workability.

In the present invention, the propylene resin (B) may be, for example, a homo isotactic polypropylene or an isotactic propylene of propylene with another α-olefin such as ethylene, butene-1, pentene-1, hexene-1. Base resin (including block and random) and the like, and a plurality of types may be mixed and used.

The melt index of the propylene resin (B) is 0.1 to 100 g / 10 min (230 ° C.,
2.16 kg load) is preferably used. If it exceeds 100 g / 10 minutes, the mechanical strength such as the heat resistance and the adhesive strength of the composition tends to decrease.
If it is shorter than / 10 minutes, the fluidity is poor and the moldability tends to decrease.

The composition of the present invention comprises (A) ethylene.α-
1 to 99 parts by weight of the olefin copolymer and 1 to 99 parts by weight of the propylene resin (B) [the total amount of (A) and (B) is 10
0 parts by weight]. Preferably (A) ethylene α
-10 to 95 parts by weight of olefin copolymer and 5 to 90 parts by weight of (B) propylene resin, more preferably 20 to 80 parts by weight of (A) ethylene / α-olefin copolymer and (B) propylene resin 20 ８０80 parts by weight.
When the content of the propylene resin (B) is less than 1 part by weight, the fluidity and processability of the composition are deteriorated. When the content exceeds 99 parts by weight, the flexibility of the composition is insufficient, which is not desirable.

In the present invention, a softening agent (C) can be added to the composition, if necessary, for improving processability.

The (C) softening agent is preferably a paraffinic or naphthenic process oil. These are used in an amount of 5 to 250 parts by weight, preferably 10 to 150 parts by weight, for adjusting the hardness and flexibility of the composition. If less than 5 parts by weight, flexibility,
Workability tends to be insufficient, and if it exceeds 250 parts by weight, bleeding of oil tends to be remarkable.

In the present invention, the composition is prepared by adding (C) a softening agent to (A) an ethylene / α-olefin copolymer, which is the specific olefin elastomer described above, and (B) a propylene resin. By combining them at a specific composition ratio, the balance between mechanical strength, flexibility and workability is improved, and they can be preferably used.

The composition provided by the present invention needs to be partially or completely crosslinked with a radical initiator such as an organic peroxide or a radical initiator and a crosslinking assistant. Thereby, it becomes possible to further improve the wear resistance, mechanical strength, heat resistance, and the like.

Here, it is important that the ethylene / α-olefin copolymer (A) has a degree of crosslinking of 50% or more, preferably 60% or more, and more preferably 70% or more.
%, Most preferably at least 80%, very preferably at least 90%. When the degree of crosslinking is less than 50%, mechanical strength such as tensile strength and compression set (C-set) is reduced.

It is essential that the ethylene / α-olefin copolymer (A) has a degree of swelling of 5 to 40%,
Preferably it is 10 to 35%, more preferably 10 to 35%.
It is 30%, most preferably 10-25%, very preferably 10-20%. The degree of swelling is a measure of the crosslink density; conventional olefin-based elastomers have a degree of swelling of 5%.
Although less than or greater than 40%, the present inventor has found that only when the degree of swelling is between 5 and 40% is an injection molded article with excellent mechanical properties obtained.

Here, specific examples of the radical initiator preferably used include 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane,
1,1-bis (t-hexylperoxy) -3,3,5
-Trimethylcyclohexane, 1,1-bis (t-hexylperoxy) cyclohexane, 1,1-bis (t-
Butylperoxy) cyclododecane, 1,1-bis (t
-Butylperoxy) cyclohexane, 2,2-bis (t-butylperoxy) octane, n-butyl-4,
Peroxy ketals such as 4-bis (t-butylperoxy) butane and n-butyl-4,4-bis (t-butylperoxy) valerate; di-t-butyl peroxide, dicumyl peroxide, t -Butylcumyl peroxide, α, α′-bis (t-butylperoxy-m
-Isopropyl) benzene, α, α'-bis (t-butylperoxy) diisopropylbenzene, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane and 2,5-dimethyl-2,5 And dialkyl peroxides such as -bis (t-butylperoxy) hexyne-3.

Further, acetyl peroxide, isobutyryl peroxide, octanoyl peroxide, decanoyl peroxide, lauroyl peroxide,
3,5,5-trimethylhexanoyl peroxide,
Diacyl peroxides such as benzoyl peroxide, 2,4-dichlorobenzoyl peroxide and m-trioyl peroxide; t-butyl peroxyacetate, t-butyl peroxyisobutyrate, t
-Butylperoxy-2-ethylhexanoate, t-
Butylperoxylaurate, t-butylperoxybenzoate, di-t-butylperoxyisophthalate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxymaleic acid, t-butylperoxymaleate
Peroxyesters such as -butylperoxyisopropyl carbonate and cumylperoxyoctate.

Further, t-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide and 1,1
Hydroperoxides such as 1,3,3-tetramethylbutyl peroxide can be exemplified.

Among these compounds, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl -2,5-bis (t-butylperoxy) hexane and 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3 are preferred.

These radical initiators are used in the composition 100
0.02 to 3 parts by weight, preferably 0.05 to 3 parts by weight
Used in an amount of １1 part by weight. If the amount is less than 0.02 parts by weight, crosslinking tends to be insufficient, and if it exceeds 3 parts by weight, the physical properties of the composition tend not to be improved.

Further, as a crosslinking assistant, divinylbenzene, triallyl isocyanurate, triallyl cyanurate, diacetone diacrylamide, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate , Ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, diisopropenylbenzene, P-quinone dioxime, P, P'-dibenzoylquinone dioxime, phenylmaleimide, allyl methacrylate, N, N'-
m-phenylene bismaleimide, diallyl phthalate,
Tetraallyloxyethane, 1,2-polybutadiene and the like are preferably used. These crosslinking aids may be used in combination of two or more.

These crosslinking aids are used in an amount of 0.1 to 5 parts by weight, preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the composition. If the amount is less than 0.1 part by weight, the crosslinking tends to be insufficient. If the amount exceeds 5 parts by weight, the physical properties of the composition do not improve and an excessive amount of the crosslinking aid tends to remain.

Further, other resins and elastomers may be added to the composition of the present invention to such an extent that its characteristics are not impaired.

The composition of the present invention can contain an inorganic filler and a plasticizer to such an extent that the characteristics of the composition are not impaired.

Examples of the inorganic filler used here include calcium carbonate, magnesium carbonate, silica, carbon black, glass fiber, titanium oxide, clay, mica, talc, magnesium hydroxide, aluminum hydroxide and the like. As the plasticizer, for example, polyethylene glycol, dioctyl phthalate (DOP)
And the like.

Further, other additives such as a flame retardant,
Organic / inorganic pigments, heat stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, silicone oils, antiblocking agents, foaming agents, antistatic agents, antibacterial agents and the like are also suitably used.

The composition of the present invention is, as a specific example,
It can be manufactured through the following processing steps.

That is, (A) an ethylene / α-olefin copolymer and (B) a propylene resin are thoroughly mixed,
Put into the hopper of the extruder. The radical initiator and the crosslinking assistant may be added from the beginning together with (A) the ethylene / α-olefin copolymer and (B) the propylene-based resin, or may be added from the middle of the extruder. The oil may be added from the middle of the extruder, or may be added separately at the beginning and during the middle. Part of (A) the ethylene / α-olefin copolymer and (B) the propylene-based resin may be partially added in the middle of the extruder. When heated and melted and kneaded in an extruder, (A) a cross-linking reaction occurs between the ethylene / α-olefin copolymer and a radical initiator and a cross-linking auxiliary, and further, an oil or the like is added and the mixture is melt-kneaded to form a cross-link. After the reaction and kneading and dispersion have been sufficiently performed, the mixture is taken out of the extruder. Pelletized to obtain pellets of the composition of the present invention.

Here, (A) the degree of crosslinking and the degree of swelling of the ethylene / α-olefin copolymer are controlled by a radical initiator,
The reaction is carried out according to the type and amount of the crosslinking aid, the reaction temperature, and the reaction system. Excessive addition of a radical initiator and a crosslinking aid increases the degree of crosslinking, but decreases the degree of swelling and does not satisfy these requirements. Alternatively, excessively active radical initiators, cross-linking aids, or high temperature reaction conditions likewise increase the degree of cross-linking but decrease the degree of swelling and do not satisfy these requirements. Then, a radical initiator and a crosslinking assistant are blended into the (A) ethylene / α-olefin copolymer while a small amount of the (C) softener is absorbed in advance in the (A) ethylene / α-olefin copolymer. Thereby, since the crosslinking reaction proceeds gently, it is possible to increase the degree of crosslinking while suppressing a decrease in the degree of swelling.

As a method for producing an injection-molded article of the present invention, a known method can be used. In particular, the injection molding method exhibits the characteristics of the present invention, is desirable, and can be manufactured.

Further, upon molding, it is also possible to manufacture by combining a plurality of materials such as extrusion molding, two-color molding and insert molding.

[0045]

The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. In these examples and comparative examples, the test methods used for evaluating various physical properties are as follows.

(1) Degree of crosslinking and degree of swelling 0.5 g of the composition was added to 200 ml of orthodichlorobenzene.
The mixture is allowed to reflux for 20 hours, the solution is filtered through a filter, and the weight (W ₁ ) of the swelling composition is measured. Then
After the swelling composition is vacuum-dried at 100 ° C. to remove the solvent, the weight (W ₂ ) is measured again. The degree of crosslinking and the degree of swelling are calculated by the following equations. That is, the weight of (A) the ethylene / α-olefin copolymer in 0.5 g of the composition is W ₀
Then, the degree of crosslinking (%) = 100 × W ₂ / W ₀ and the degree of swelling (%) = 100 × W ₁ / W ₂ .

(2) Environmental Degradation Resistance The molded article was heated in a gear oven at 120 ° C. for 100 hours, the change in color tone was observed, and the environmental degradation resistance was evaluated.

(3) Tensile breaking strength [kgf / cm ² ] A molded product is compression-molded to produce a sheet, which is then subjected to JIS K62.
The evaluation was performed at 23 ° C. in accordance with No. 51.

(4) Tensile Elongation at Break [%] A molded article is compression molded to produce a sheet, and JIS K62
The evaluation was performed at 23 ° C. in accordance with No. 51.

(5) Compression set (C-Set) [%] A molded article is compression-molded to produce a sheet, and the sheet is subjected to JIS K63.
According to No. 01, evaluation was made at 70 ° C. × 22 hours as an index of durability. The smaller the value, the better the durability.

(6) Abrasion Resistance A molded product is compression-molded to form a sheet, a 5 cm × 5 cm × 2 mm stainless plate with a felt cloth adhered to the lower surface is placed on the sheet, and a load of 100 g / cm ² is applied. Then, a weight was placed so as to apply a reciprocating motion 10,000 times at a speed of 30 reciprocations / minute, and the surface condition was observed.

(7) Density Evaluated at 23 ° C. according to ASTM D792.

The following components were used in Examples and Comparative Examples.

(A) Ethylene / α-olefin copolymer a) Copolymer of ethylene and octene-1 (TPE-
1) It was prepared by a method using a metallocene catalyst described in JP-A-3-1630088. The ethylene / octene-1 composition ratio of the copolymer is 72/28 (weight ratio),
The density is 0.863 (referred to as TPE-1).

B) Copolymer of ethylene and octene-1 (TPE-2) Produced by a method using a usual Ziegler catalyst. The ethylene / octene-1 composition ratio of the copolymer is 72/2.
8 (weight ratio) (referred to as TPE-2).

C) Ethylene / propylene / dicyclopentadiene copolymer (TPE-3) Produced by a method using a metallocene catalyst described in JP-A-3-16388. The composition ratio of ethylene / propylene / dicyclopentadiene in the copolymer is 72/2.
4/4 (weight ratio) (referred to as TPE-3).

D) Copolymer of ethylene and octene-1 (TPE-4) This was prepared by a method using a metallocene catalyst described in JP-A-3-16388. The ethylene / octene-1 composition ratio of the copolymer is 60/40 (weight ratio),
The density is 0.857 (referred to as TPE-4).

(B) Propylene resin Isotactic polypropylene (referred to as PP) manufactured by Nippon Polychem Co., Ltd.

(C) Paraffin oil Diana Process Oil PW-38 manufactured by Idemitsu Kosan Co., Ltd.
0 (referred to as MO).

(D) Radical initiator 2,5-dimethyl-2,5-bis (t-manufactured by NOF Corporation)
Butylperoxy) hexane (trade name Perhexa 25)
B) (referred to as POX).

(E) Crosslinking aid divinylbenzene (referred to as DVB) manufactured by Wako Pure Chemical Industries, Ltd.

Example 1 As an extruder, a twin-screw extruder (40 mmφ, L / D = 4) having an inlet at the center of the barrel was used.
7) was used. As the screw, a double screw having a kneading portion before and after the injection port was used.

TPE-1 / PP / POX / DVB / MO
= 65/35 / 0.5 / 1.0 / 45 (parts by weight), first, 65 parts by weight of TPE-1 and MO
After preliminary dry blending 15 parts by weight, 0.5 part by weight of POX and 1.0 part by weight of DVB, the remaining components other than MO were mixed with the above blend. Next, the mixture was introduced into a twin-screw extruder (cylinder temperature 220 ° C.),
Subsequently, the remaining MO is injected from the injection port at the center of the extruder.
Was injected by a pump, melt-extruded, and pelletized by a pelletizer. The pellets obtained in this way were weighed 2 m long and 1 width wide using an injection molding machine.
A refrigerator packing (injection molded product) having a size of m and a width of 2 cm was produced (extrusion temperature: 220 ° C.).

The obtained injection-molded article is excellent in feel (flexibility), has no color change with respect to the initial white color even in a gear oven at 120 ° C. for 100 hours, and has excellent environmental degradation resistance. I have.

The 2 mm sheet obtained by compression molding of the injection molded article has excellent abrasion resistance, durability and mechanical strength because it has a degree of crosslinking of 75% and a degree of swelling of 15%. ing.

Tensile breaking strength: 100 [kgf / cm ² ] Tensile breaking elongation: 450 [%] Compression set (C-Set): 37 [%] Abrasion resistance: scars are hardly noticeable.

(Comparative Example 1) In Example 1, the components except for MO were introduced into a twin-screw extruder at the same composition ratio but without a pre-blend, and then the mixture was placed at the center of the extruder. The same experiment as in Example 1 was repeated by injecting the entire amount of MO from the inlet by a pump and performing melt extrusion.

The obtained injection-molded article is excellent in feel (flexibility), has no change in color tone with respect to the initial white color even in a gear oven at 120 ° C. for 100 hours, and has excellent environmental degradation resistance. However, 2m obtained by compression molding of an injection molded product
Since the sheet of m has a degree of crosslinking of 75% and a degree of swelling of 3%, the sheet has inferior abrasion resistance, durability and mechanical strength as compared with Example 1.

Tensile rupture strength: 70 [kgf / cm ² ] Tensile rupture elongation: 350 [%] Compression set (C-Set): 40 [%] Abrasion resistance: scars are hardly noticeable.

Comparative Example 2 TPE-1 in Example 1
The same experiment was repeated except that was changed to TPE-2.

The obtained injection-molded product has no color change with respect to the initial white color even in a gear oven at 120 ° C. for 100 hours, and is excellent in environmental degradation resistance. The obtained 2 mm sheet is inferior in abrasion resistance, durability and mechanical strength.

Tensile breaking strength: 69 [kgf / cm ² ] Tensile breaking elongation: 370 [%] Compression set (C-Set): 50 [%] Abrasion resistance: scratches are noticeable.

Comparative Example 3 TPE-1 in Example 1
The same experiment was repeated except that was changed to TPE-3.

The obtained injection-molded product turned from an initial white color to yellow color at 120 ° C. for 100 hours in a gear oven. In addition, 2 mm obtained by compression molding of an injection molded product
Is inferior in abrasion resistance, durability and mechanical strength.

Tensile rupture strength: 59 [kgf / cm ² ] Tensile rupture elongation: 290 [%] Compression set (C-Set): 58 [%] Abrasion resistance: scratches are noticeable.

(Example 2) TPE-1 in Example 1
The same experiment was repeated except that was changed to TPE-4.

The obtained injection-molded product has no change in color tone with respect to the initial white color even in a gear oven at 120 ° C. for 100 hours, and is excellent in environmental resistance. A 2 mm sheet obtained by compression molding of an injection molded product has a degree of crosslinking of 85.
% And a degree of swelling of 16%, the abrasion resistance and durability are extremely excellent as compared with Example 1.

Tensile breaking strength: 90 [kgf / cm ² ] Tensile breaking elongation: 650 [%] Compression set (C-Set): 21 [%] Abrasion resistance: scars are hardly noticeable.

(Examples 3-6, Comparative Examples 4-5) Example 1
Alternatively, in Comparative Example 1, the presence or absence of
The same experiment as in Example 1 or Comparative Example 1 was repeated except that the degree of crosslinking and the degree of swelling were controlled by changing the ratio of X and DVB. Table 1 shows the evaluation results of the 2 mm sheet obtained by compression molding the obtained injection molded product.

[0080]

[Table 1]

[0081]

The injection-molded article of the present invention has excellent environmental degradation resistance, abrasion resistance, durability and mechanical strength, and is excellent in tactile sensation (flexibility). It can be widely used in various fields such as exterior parts, housing and building material parts, and plays a large role in industry.

Claims (2)

[Claims] (A) ethylene and α- having 6 to 12 carbon atoms
1 to 99 parts by weight of an ethylene / α-olefin copolymer produced using a metallocene-based catalyst composed of an olefin and 1 to 99 parts by weight of (B) a propylene-based resin [the total amount of (A) and (B) is 100 Parts by weight], and (A) a partially or completely crosslinked composition having a degree of crosslinking of the ethylene / α-olefin copolymer of 50% or more and a degree of swelling of 5 to 40%. Injection molded products. 2. The weight ratio of the α-olefin having 6 to 12 carbon atoms in the ethylene / α-olefin copolymer (A) is 30 to 60% by weight, and (A) ethylene / α
The injection molded article according to claim 1, wherein the density of the olefin copolymer is 0.80 to 0.86.