JP2000007850A - Thermoplastic polymer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermoplastic polymer composition processed according to dynamic cross-linking and capable of manifesting excellent processability, resistance to environmental deterioration and mechanical characteristics by using an olefinic elastomer having a specific structure comprising ethylene and an α-olefin. SOLUTION: This composition is a partially cross-linked or a completely cross-linked thermoplastic polymer composition comprising (A) 1-99 pts.wt. of an ethylene-α-olefin copolymer composed of ethylene and a 3-20C α-olefin and obtained by using a metallocene-based catalyst and (B) 1-99 pts.wt. of an olefinic resin (with the proviso that the sum total of the components A and B is 100 pts.wt.). The block ratio determined from the formula [PE] is the contained molar fraction of units derived from ethylene in the component A; [PO] is the contained molar fraction of units derived from the α-olefin in the component A; [POE] is the ratio of the number of α-olefin-ethylene chains based on the number of the total dyad chains in the component A} by using a 13C-NMR spectrum of the component A is 0-0.999.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic polymer composition. More specifically, it relates to a thermoplastic polymer composition having excellent mechanical strength.

[0002]

2. Description of the Related Art Thermoplastic by so-called dynamic crosslinking, in which a radically crosslinkable olefinic elastomer and an olefinic resin having no radical crosslinkability such as PP are crosslinked while being melt-kneaded in an extruder in the presence of a radical initiator. Polymer compositions, especially thermoplastic elastomer compositions, are already known technologies and are widely used in applications such as automobile parts.

[0003] In such a thermoplastic elastomer composition, ethylene-propylene-diene rubber (EPDM) has been conventionally used as an olefin elastomer. Although EPDM is excellent in crosslinkability due to the presence of a diene component in the polymer chain, improvement in quality has been desired because of poor environmental degradation resistance.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention has no such problems as described above, that is, the workability,
An object of the present invention is to provide a thermoplastic polymer composition by dynamic crosslinking excellent in environmental degradation resistance and mechanical properties.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on a thermoplastic polymer obtained by dynamic crosslinking having excellent mechanical strength, and have found that an olefin having a specific structure comprising ethylene and an α-olefin has been obtained. Surprisingly, it has been found that the mechanical strength is dramatically improved by using a system elastomer, and the present invention has been completed.

That is, the present invention relates to (A) ethylene and a compound having 3 carbon atoms.
Ethylene-α-olefin copolymer comprising α-olefins of from 20 to 20 and produced using a metallocene catalyst 1
A partially or completely crosslinked thermoplastic polymer composition consisting of 1 to 99 parts by weight and (B) an olefinic resin of 1 to 99 parts by weight [the total amount of (A) and (B) is 100 parts by weight]. The thermoplastic polymer composition characterized in that the block ratio determined from the following formula using the ¹³ C-NMR spectrum of (A) is from 0 to 0.999, and particularly the block ratio is from 0.1 to 0.999. A thermoplastic polymer composition having a molecular weight of 800 to 0.999.

Block ratio = [P _OE ] / (2 · [P _E ] · [P _O ]) (where [P _E ] is a mole fraction of a unit derived from ethylene in (A)) And [P ₀ ] is α in (A)
-The molar fraction of units derived from olefins,
[P _OE ] is the ratio of the number of α-olefin / ethylene chains to the total number of dyad chains in (A). Hereinafter, the present invention will be described in detail.

[0008] The thermoplastic polymer composition of the present invention comprises (A)
It comprises an ethylene / α-olefin copolymer rubber produced using a metallocene catalyst and (B) an olefin resin. Here, (A) shows that the specified block ratio is 0 to 0.
It is important that it is 0.999, preferably 0.000.
1 to 0.999, more preferably 0.500 to 0.99.
999, most preferably from 0.800 to 0.999, and most preferably from 0.990 to 0.999. The block ratio is an index indicating the distribution of ethylene and α-olefin in the copolymer, and when the block ratio is in the range of 0 to 0.999, the block-like chain of ethylene and α-olefin becomes longer, As a result, the composition distribution of the copolymer becomes wider. By using (A) having a wide copolymer composition distribution, an excellent compatibility improving effect is exhibited as (B) especially for a copolymer resin or a combination of a plurality of thermoplastic resins.

Hereinafter, each component of the present invention will be described in detail. In the present invention, (A) an ethylene / α-olefin copolymer composed of ethylene and an α-olefin having 3 to 20 carbon atoms produced using a metallocene catalyst,
There is no particular limitation as long as the specified block ratio is satisfied. Examples of the α-olefin having 3 to 20 carbon atoms include propylene, butene-1, pentene-1, 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.

The ethylene / α-olefin copolymer as the olefin elastomer used in the present invention 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 certain carbon number of 3 to 20
The olefin distribution is uniform;

The ethylene / α-olefin copolymer (A) used in the present invention preferably has an α-olefin copolymerization ratio of 1 to 50% by weight, more preferably 10 to 40% by weight, most preferably Preferably 20 to 30
% By weight. If the copolymerization ratio of the α-olefin exceeds 50% by weight, the hardness, tensile strength, etc. of the composition are greatly reduced, while if it is less than 1% by weight, the block ratio becomes large,
As a result of reduced compatibility, mechanical strength is reduced.

The density of (A) is 0.8 to 0.9 g / cm.
It is preferably in the range of ³ . By using a resin having a density in this range, a thermoplastic polymer composition having excellent flexibility and low hardness can be obtained. In particular, between the copolymerization ratio c (% by weight) and the density d (g / cm ³ ),
When the following formula (a) is satisfied, the balance between the physical properties of mechanical strength and hardness is excellent and more preferable. −0.0026 × c + 0.9200 ≦ d ≦ −0.0026 × c + 0.9400 (a) If the density d is lower than this range, the mechanical strength is insufficient. Conversely, if the density d is higher than this range, the oil When oil is used, oil bleeding tends to occur, which is not preferable.

It is desirable that the ethylene / α-olefin copolymer used in the present invention has a long chain branch. Due to the presence of long-chain branching, the ratio of the copolymerized α-olefin (% by weight) without lowering the mechanical strength
As compared with the above, the density can be further reduced, and a low-density, low-hardness, high-strength elastomer can be obtained.

The 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 the ethylene / α-olefin copolymer used in the present invention is 0.01 to 1
Those having a range of 00 g / 10 minutes (190 ° C., 2.16 kg load) are preferably used, and more preferably 0.2 to 10 minutes.
10 g / 10 min. If it exceeds 100g / 10 minutes,
If the crosslinkability of the thermoplastic polymer composition is insufficient, and if it is less than 0.01 g / 10 minutes, the fluidity is poor and the processability is undesirably reduced.

(A) used in the present invention may be a mixture of a plurality of types. In such a case, it is possible to further improve the workability. In the present invention, the olefin resin (B) may be polyethylene, homoisotactic polypropylene, propylene and ethylene, butene-1, pentene-1, hexene-.
And isotactic copolymer resins (including block and random) with other α-olefins such as 1.

At least one resin selected from these resins is used in a composition ratio of 1 to 99 parts by weight. Preferably it is 5-90 parts by weight, more preferably 20-80 parts by weight. If the amount is less than 1 part by weight, the fluidity and processability of the composition are reduced, and if it exceeds 99 parts by weight, the flexibility of the composition is insufficient, which is not desirable. The melt index of the propylene resin suitably used in the present invention is 0.1.
1-100g / 10min (230 ° C, 2.16kg load)
Those in the range are preferably used. If it exceeds 100 g / 10 minutes, the heat resistance and mechanical strength of the thermoplastic elastomer composition will be insufficient, and if it is less than 0.1 g / 10 minutes, the fluidity will be poor and the moldability will be reduced, which is not desirable. .

In the present invention, (C) a softening agent can be blended as required to improve workability. The above (C) is preferably a paraffinic or naphthenic process oil. These are used in order to adjust the hardness and flexibility of the composition, and 5 to 2 parts by weight based on 100 parts by weight of (A) and (B).
50 parts by weight, preferably 10 to 150 parts by weight are used. 5
If the amount is less than parts by weight, flexibility and workability are insufficient, and if it exceeds 250 parts by weight, oil bleeding becomes remarkable, which is not desirable.

The preferred thermoplastic polymer composition provided by the present invention includes (A) the specific ethylene / α-olefin copolymer described above, (B) an olefin resin, and (C)
By combining a softening agent at a specific composition ratio, the balance between mechanical strength, flexibility, and processability is improved, and it can be preferably used. The thermoplastic polymer composition provided by the present invention requires that the composition be partially cross-linked with a radical initiator such as an organic peroxide or a radical initiator and a crosslinking aid. Thereby, it becomes possible to further improve the wear resistance, mechanical strength, heat resistance, and the like.

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 Dialkyl peroxides such as -bis (t-butylperoxy) hexyne-3; acetyl peroxide, isobutyryl peroxide, octanoyl peroxide, decanoyl peroxide, lauroyl peroxide, 3,5,5-trimethylhexa Diacyl peroxides such as noyl peroxide, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide and m-trioyl peroxide; t-butylperoxyacetate, t
-Butylperoxyisobutyrate, t-butylperoxy-2-ethylhexanoate, t-butylperoxylaurate, t-butylperoxybenzoate,
Di-t-butylperoxyisophthalate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxymaleic acid, t-butylperoxyisopropyl carbonate, and cumylperoxyoctate Peroxyesters; and
Hydrogens such as t-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide and 1,1,3,3-tetramethylbutyl peroxide Peroxides can be mentioned.

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 (A) 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, the crosslinking is insufficient, and if it exceeds 3 parts by weight, the physical properties of the composition are not improved, which is not preferable. Further, as a crosslinking aid, 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 ^'- dibenzoyl quinone dioxime, phenylmaleimide, allyl methacrylate, N, ^{N'-m-phenylene} bismaleimide, diallyl phthalate, tetraallyloxyethane, 1,2-polybutadiene or the like is preferably used Can be 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, per 100 parts by weight of (A). If the amount is less than 0.1 part by weight, crosslinking is insufficient, and if it exceeds 5 parts by weight, the physical properties of the composition are not improved, and an excessive amount of a crosslinking aid remains, which is not preferable. Further, other resins and elastomers may be added to the thermoplastic polymer composition of the present invention to such an extent that its characteristics are not impaired.

In particular, a block copolymer comprising at least one polymer block A mainly composed of a vinyl aromatic compound and at least one polymer block B mainly composed of a conjugated diene compound, or a block copolymer of this type. The addition of a block copolymer obtained by hydrogenating the coalesced oil is preferable because the oil retention can be dramatically improved.

This block copolymer is, for example, A-
B, A-B-A, B-A-B-A, A-B-A-B-
A, BABAB, (AB) ₄ Si, (BA
-B) ₄ Si, and has a _{(B-A-B) 4} Sn structure such. The polymer block mainly composed of a vinyl aromatic compound is a copolymer block of a vinyl aromatic compound containing 50% by weight or more of a vinyl aromatic compound and a conjugated diene compound and / or a homopolymer block of a vinyl aromatic compound. Show.

The polymer block mainly composed of a conjugated diene compound is a copolymer block of a conjugated diene compound containing at least 50% by weight of a conjugated diene compound and a vinyl aromatic compound and / or a homopolymer block of a conjugated diene compound. Show. As the vinyl aromatic compound constituting the block copolymer, one or more of styrene, methylstyrene, 1,3-dimethylstyrene, p-tert-butylstyrene and the like can be used. Among them, styrene is preferred.

As the conjugated diene compound constituting the block copolymer, one or more of butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene and the like can be used. . Among them, butadiene, isoprene and a combination thereof are preferred. As a method for producing these block copolymers, any known method may be used, for example, a method of block-polymerizing a vinyl aromatic compound and a conjugated diene compound using a polymerization initiator such as an organic lithium compound in a hydrocarbon solvent. It is.

The hydrogenated block copolymer can be obtained by subjecting the block copolymer to a hydrogenation reaction. The method of the hydrogenation reaction may be any known method, for example, hydrogenation can be performed in an inert solvent in the presence of a hydrogenation catalyst. The reaction conditions for hydrogenation are selected such that at least 80%, preferably 90% or more, of the conjugated diene compound is hydrogenated, while less than 20%, preferably less than 10%, of the vinyl aromatic compound is hydrogenated. Is done.

The number average molecular weight of the block copolymer having the above structure is 20,000 to 300,000, preferably 30.
000 to 200,000. The block copolymer of the present invention has mechanical properties as an elastomer,
It has a high oil retention ability and has the property of being crosslinked by a radical initiator. Therefore, by having the block copolymer as one component, the composition of the present invention can hold a large amount of rubber oil, and it becomes easy to obtain a low hardness composition. In the case of a dynamic crosslinking reaction,
It also functions as a crosslinkable elastomer component together with the ethylene / α-olefin copolymer.

The block copolymer is composed of 10 (A) and (B).
It is used in a composition ratio of 0 to 100 parts by weight with respect to 0 parts by weight. If it exceeds 100 parts by weight, the crosslinkability of the composition decreases, which is not desirable. Particularly, by adding a low molecular weight ethylene polymer having a number average molecular weight of 20,000 or less,
The molding processability of the composition, the surface texture of the molded product, and the like are remarkably improved, which is desirable.

In addition, the following polymers may be added to the composition of the present invention to such an extent that the characteristics are not impaired. Specifically, polyethylene, polybutene, polyisobutene,
Ethylene-vinyl ester copolymers such as ethylene-vinyl acetate copolymers, ethylene-unsaturated carboxylic acid ester copolymers such as ethylene-ethyl acrylate copolymers,
And ethylene-vinyl alcohol copolymer.

Further, the thermoplastic polymer composition of the present invention can contain an inorganic filler and a plasticizer to such an extent that the characteristics thereof are not impaired. As the inorganic filler used here, for example, calcium carbonate, magnesium carbonate, silica, carbon black, glass fiber, titanium oxide, clay, mica, talc, magnesium hydroxide,
Aluminum hydroxide and the like. Examples of the plasticizer include phthalic acid esters such as polyethylene glycol and dioctyl phthalate (DOP). Also, other additives, for example, organic and inorganic pigments,
Heat stabilizer, antioxidant, ultraviolet absorber, light stabilizer, flame retardant, silicone oil, anti-blocking agent, foaming agent,
Antistatic agents, antibacterial agents and the like are also preferably used.

For the production of the thermoplastic polymer composition of the present invention, a Banbury mixer, a kneader, a single-screw extruder used for the production of ordinary resin compositions and elastomer compositions are used.
It is possible to employ a general method such as a twin-screw extruder. In particular, a twin-screw extruder is preferably used to achieve dynamic crosslinking efficiently. The twin-screw extruder uniformly and finely disperses the olefin-based elastomer and the olefin-based resin, and further adds other components to cause a crosslinking reaction, thereby continuously producing the thermoplastic polymer composition of the present invention. More suitable for manufacturing.

Dynamic cross-linking is a processing method in which a cross-linking reaction is carried out in a kneading machine in a short time.
A copolymer having a length of 2 seconds or less is desirable, and more preferably 2 copolymers.
00 seconds or less is desirable. Here, the crosslinking time (Tc90)
Is the time required to reach 90% of the maximum degree of crosslinking (viscosity) when adding 1.0 part by weight of dicumyl peroxide as a peroxide to an elastomer and measuring the vulcanization characteristics with a rheometer at 170 ° C. It is.

In the present invention, the form of the ethylene / α-olefin copolymer or olefin resin is preferably a finely divided form such as pellets, powders, and crumbs. As a specific example, the thermoplastic polymer composition of the present invention can be produced through the following processing steps. That is,
The ethylene / α-olefin copolymer rubber and the olefin resin are mixed well and put into a hopper of an extruder. The radical initiator and the crosslinking assistant may be added together with the ethylene / α-olefin copolymer rubber and the olefin resin from the beginning, 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 the ethylene / α-olefin copolymer rubber and the olefin resin may be added in the middle of the extruder. When heated and melted and kneaded in an extruder, the elastomer and the radical initiator and the crosslinking auxiliary undergo a crosslinking reaction, and the crosslinking reaction and kneading dispersion are sufficiently performed by further adding and melting oil and kneading. Then remove from the extruder. Pellets can be obtained to obtain pellets of the thermoplastic polymer composition of the present invention.

Defining the degree of crosslinking as a measure of the crosslinkability of the composition, 0.5 g of the thermoplastic polymer composition of the present invention is refluxed in 200 ml of xylene for 4 hours. The solution is filtered through a filter paper for quantification, the residue on the filter paper is vacuum-dried, quantified, and calculated as a ratio (%) of the weight of the residue to the weight of the olefin-based elastomer in the composition. The degree of crosslinking of the thermoplastic polymer composition as a preferred composition of the present invention,
30% or more is desirable. If it is less than 30%, crosslinking is insufficient, and heat resistance such as compression set and physical properties such as rebound resilience are reduced.

The thermoplastic polymer composition thus obtained can be used to produce various molded articles by any molding method. Injection molding, extrusion molding, compression molding, blow molding, calender molding, foam molding and the like are preferably used.

[0037]

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In these examples and comparative examples, the test methods used for evaluating various physical properties are as follows. (1) Block ratio Using a JEOL-GX270 NMR measurement device manufactured by JEOL Ltd., hexachlorobutadiene / d ₆ having a sample concentration of 5% by weight was used.
-Benzene = 2/1 (volume ratio) was mixed with 67.8M
It is measured on the basis of d ₆ -benzene (128 ppm) at 60 ° C. and Hz.

The analysis of the ¹³ C-NMR spectrum is basically based on the proposal of Lindemann Adams [Analysis Chemistry 43,
p.1245 (1971); JCRandall (Review Macromolecular Che
mistry Physics, C29, 201 (1989)]. Block ratio = [P _OE ] / (2 · [P _E ] · [P _O ]) (where [P _E ] is the content mole fraction of the unit derived from ethylene in (A), P ₀ ] is α in (A)
-The molar fraction of units derived from olefins,
[P _OE ] is the ratio of the number of α-olefin / ethylene chains to the total number of dyad chains in (A). (2) Surface Hardness Four sheets having a thickness of 2 mm were stacked and evaluated according to ASTM D2240 using a type A in a 23 ° C. atmosphere. (3) Tensile breaking strength [kgf / cm ² ] Evaluated at 23 ° C. according to JIS K6251. (4) Tensile Elongation at Break [%] Evaluated at 23 ° C. according to JIS K6251.

The following components were used in Examples and Comparative Examples. (A) Ethylene / α-olefin copolymer Copolymer of ethylene and butene-1 It was produced using a metallocene catalyst by the method described in JP-A-3-16388.

Ethylene / butene-1 of the obtained copolymer
Is 72/28 (weight ratio), and the block ratio is shown in Table 1. (B) Olefin resin Polypropylene manufactured by Nippon Polychem Co., Ltd., isotactic polypropylene (referred to as PP) Polyethylene manufactured by Asahi Kasei Kogyo Co., Ltd., low density polyethylene (Suntec-LD M6555) (referred to as PE) Ethylene-ethyl acrylate copolymer Resin body Nippon Unicar Co., Ltd., EEA resin (NUC copolymer DPDJ-8026 (referred to as EEA)) (c) Paraffin oil Idemitsu Kosan Co., Ltd., Diana Process Oil PW-3
80 (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 auxiliary divinylbenzene (referred to as DVB) manufactured by Wako Pure Chemical Industries, Ltd.

[0041]

Examples 1 to 8 and Comparative Examples 1 to 4 As an extruder, a twin screw extruder (40 mmφ, L /
D = 47) was used. As the screw, a double screw having a kneading portion before and after the injection port was used. After mixing other than MO at the composition ratio (parts by weight) described in Table 1, the mixture was introduced into a twin-screw extruder (cylinder temperature 220 ° C.).
A predetermined amount of MO was injected by a pump from an injection port at the center of the extruder, and melt extrusion was performed.

A 2 mm-thick sheet was formed from the elastomer composition thus obtained by compression molding at 200 ° C., and each mechanical property was evaluated. Table 1 shows the results.

[0043]

[Table 1]

According to Table 1, the ethylene / α-olefin copolymer having the block ratio of the requirement of the present invention can be used as (B) with a copolymer resin or a blend of a plurality of homopolymer resins rather than a homopolymer resin. It can be seen that the combination has better mechanical properties. Further, it can be seen that excellent mechanical properties are exhibited.

[0045]

Industrial Applicability The thermoplastic polymer composition of the present invention has excellent mechanical properties. The composition of the present invention can be used for automotive parts, automotive interior materials, airbag covers, mechanical parts, electrical parts, cables, hoses, belts, toys, miscellaneous goods, daily necessities, building materials, sheets, films, and other applications. It can be used widely and plays a large role in the industrial world.

Claims (2)

[Claims] (A) ethylene and α- having 3 to 20 carbon atoms
1 to 99 parts by weight of an ethylene / α-olefin copolymer produced using a metallocene catalyst comprising an olefin, and 1 to 99 parts by weight of an olefin resin (B) [the total amount of (A) and (B) is 100 parts by weight. A partially or completely crosslinked thermoplastic polymer composition, wherein the block ratio determined from the following formula using the ¹³ C-NMR spectrum of (A) is 0 to 0.999: What is claimed is: 1. A thermoplastic polymer composition comprising: Block ratio = [P _OE ] / (2 · [P _E ] · [P _O ]) (where [P _E ] is the content mole fraction of the unit derived from ethylene in (A), P ₀ ] is α in (A)
-The molar fraction of units derived from olefins,
[P _OE ] is the ratio of the number of α-olefin / ethylene chains to the total number of dyad chains in (A). ) 2. The thermoplastic polymer composition according to claim 1, wherein the block ratio is from 0.800 to 0.999.