JPH10139949A - Polyolefinic resin composition, and production of molded resin item from the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyolefinic resin compsn. for masterbatches which is excellent in physical properties such as stiffness and impact resistance, and is moldable by extrusion, injection molding, etc. SOLUTION: This process for producing the molded resin item comprises the first step wherein 100 pts.wt. resin mixture comprising 30-95wt.% polyethylene resin obtd. by copolymerizing ethylene and an α-olefin in the presence of a metallocene compd. contg. a tetravalent transition metal as the polymn. catalyst and 70-5wt.% polypropylene resin is mixed with 100-900 pts.wt. inorg. filler to give a polyolefin resin compsn. and the second step wherein 5-80wt.% polyolefin resin compsn. prepd. at the first step is mixed with 95-20wt.% thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a polyolefin resin composition, and more particularly, to a molded article which provides various properties such as excellent rigidity and impact resistance.
The present invention relates to a polyolefin resin composition suitably used as an economically advantageous master batch.

2. Description of the Related Art Conventionally, for the purpose of reducing material costs, improving mechanical properties such as rigidity and tensile strength, and improving dimensional stability, a resin composition obtained by adding various inorganic fillers to a synthetic resin has been used. It is widely used in a wide range of fields such as automotive parts, precision equipment parts, electric / electronic parts, and medical supplies.

[0002] As a resin composition to which the above-mentioned inorganic filler is added, for example, JP-A-58-16848, JP-A-61-276840 and JP-A-63-57653 disclose polypropylene resin. A resin composition containing an inorganic filler and a rubber component is disclosed.

However, in the resin composition containing the above-mentioned inorganic filler, when the content of the inorganic filler increases, mechanical properties such as impact resistance and molding processability decrease, and when the content of the rubber component increases, the content of the rubber component increases. There is a problem that rigidity is reduced, and it has been difficult to produce a resin composition in which various physical properties are balanced.

When a resin composition containing the above-mentioned inorganic filler is used as a masterbatch, when the content of the inorganic filler increases, the dispersibility in a diluting resin is significantly reduced, and various physical properties are found to decrease. There was a problem that was.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above, and has various physical properties such as excellent rigidity and impact resistance, and can be used in molding methods such as extrusion molding and injection molding. An object of the present invention is to provide a polyolefin resin composition for a masterbatch having moldability.

[0006]

Means for Solving the Problems The present inventors have sincerely studied to solve the above problems, and have used a mixture of a polyethylene resin and a polypropylene resin copolymerized with a metallocene compound as a polymerization catalyst. Thereby, even if a large amount of inorganic filler is blended, it is possible to obtain a resin composition for a masterbatch that has good moldability and dispersibility in a diluting resin, thereby achieving a balance between rigidity and impact resistance. It has been found that a molded resin article can be produced, and the present invention has been completed.

That is, the polyolefin resin composition of the present invention comprises 30 to 95% by weight of a polyethylene resin obtained by copolymerizing ethylene and an α-olefin with a metallocene compound containing a tetravalent transition metal as a polymerization catalyst; 100 to 900 parts by weight of an inorganic filler is blended with 100 parts by weight of a resin mixture composed of 70 to 5% by weight of a system resin.

The above-mentioned polyethylene resin is a resin obtained by performing a polymerization reaction using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst, and comprising a structural unit of ethylene and an α-olefin other than ethylene. It is.

The α-olefin other than the above ethylene is not particularly restricted but includes, for example, propylene, 1-butene,
Examples include 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene and the like.

The tetravalent transition metal is not particularly limited, and includes, for example, titanium, zirconium, nickel, palladium, hafnium, platinum and the like. The metallocene compound is a general term for a compound in which one or more cyclopentadiene rings, analogs, and the like exist as a ligand in the tetravalent transition metal.

The above-mentioned analogs are not particularly restricted but include, for example, a cyclopentadiene ring substituted by a hydrocarbon group, a substituted hydrocarbon group, a hydrocarbon-substituted metalloid group; a cyclopentadienyl oligomer ring; an indenyl ring; And an indenyl ring substituted by a hydrogen group, a substituted hydrocarbon group, a hydrocarbon-substituted metalloid group, and the like.

The ligand other than the cyclopentadiene ring and the analog is not particularly limited, and examples thereof include a monovalent anion ligand such as chlorine and bromine; a divalent anion chelate ligand; a hydrocarbon group; an alkoxide; an arylamide; Aryl oxide; amide; aryl amide; phosphide; aryl phosphide; silyl group; Examples of the hydrocarbon group include, for example, methyl, ethyl, propyl, butyl, amyl, isoamyl, hexyl, isobutyl, heptyl, octyl, nonyl, decyl, cetyl, 2- Examples include an ethylhexyl group and a phenyl group.

Examples of the metallocene compound to which the above ligand is coordinated include cyclopentadienyl titanium tris (dimethylamide), methylcyclopentadienyl titanium tris (dimethylamide), bis (cyclopentadienyl) titanium dichloride, dimethyl Silyltetramethylcyclopentadienyl-tert-butylamidozirconium dichloride, dimethylsilyltetramethylcyclopentadienyl-tert-butylamidohafnium dichloride, dimethylsilyltetramethylcyclopentadienyl-pn-butylphenylamidozirconium chloride, Methylphenylsilyltetramethylcyclopentadienyl-tert-butylamidohafnium dichloride, indenyl titanium tris (dimethylamide), indenyl titanium Tris (diethylamide), indenyl titanium tris (di -n- propyl amide), indenyl titanium bis (di -n- butylamide) (di -n- propyl amide) and the like.

The method for polymerizing ethylene and an α-olefin other than ethylene to obtain the above polyethylene resin is not particularly limited. For example, a solution polymerization method using an inert medium; A polymerization method, a gas phase polymerization method and the like can be mentioned. The polymerization temperature is from -10 ° C to 30
0 ° C. is common and the polymerization pressure is 100 kg / cm ²
The degree is common. The above reaction is, for example, a metallocene compound containing a tetravalent transition metal used in the present invention as a polymerization catalyst, for example, methylaluminoxane as a cocatalyst,
The reaction can be performed using a catalyst system to which a boron compound or the like is added.
The ratio of the cocatalyst to the metallocene compound is 1
It is 0 to 1,000,000 times.

Examples of the polyethylene resin commercialized using the above metallocene compound as a polymerization catalyst include “AFFINITY” and “ENGAG” manufactured by Dow Chemical Company.
Commercial products such as "E" and "EXACT" manufactured by Exxon Chemical Co., Ltd. can also be used.

The density of the polyethylene resin is 0.8
It is preferably from ⁴ to 0.90 g / cm ³ . 0.8
If it is less than 4 g / cm ³ , the crystallinity of the resin is low and low, so that the obtained polyolefin resin composition has insufficient mechanical strength such as rigidity and tensile strength, and 0.90 g / c.
When it exceeds m ³ , the crystallinity of the resin becomes high,
The flexibility and elongation characteristics of the resulting polyolefin-based resin composition become insufficient.

MFR (melt flow rate: test temperature: 190 ° C., test load: 2.16 k) of the above polyethylene resin
When gf) is less than 0.1 g / 10 min, the dispersibility of the inorganic filler is reduced. When it exceeds 20 g / 10 min, the elongation characteristics of the obtained resin composition are reduced.
20 g / 10 min is preferred.

The physical properties of the polyethylene resin can be evaluated by differential scanning calorimetry and cross-fractionation analysis.

In the differential scanning calorimetry, about 10 mg of the polyethylene resin sample was placed in a platinum pan, and the sample was once melted, cooled to -50 ° C. at a rate of 5 ° C./min, and then cooled at 5 ° C./min. Measure while raising the temperature at the speed. The measurement was performed using a differential scanning calorimeter (manufactured by Seiko Electronics Co., Ltd., S
SC5200 type) can be used.

The cross-fractionation analysis comprises a part for measuring the molecular weight and the molecular weight distribution by high-temperature elution fractionation and high-temperature gel permeation chromatography.

In the separation by temperature rise elution, the above polyethylene resin is dissolved in o-dichlorobenzene at 140 ° C. or at a temperature at which the polyethylene resin is completely dissolved, cooled at a constant rate, and placed on the surface of an inert carrier prepared in advance. A thin polymer layer is formed in the order of high crystallinity and high molecular weight, and then the temperature is increased continuously or stepwise, the concentration of the components eluted sequentially is detected, and the crystallinity distribution and composition distribution are measured. At the same time, the molecular weight and molecular weight distribution of each eluted component are measured by high-temperature gel permeation chromatography. For the measurement, a cross-separation chromatograph (CFC-T15, manufactured by Mitsubishi Chemical Corporation) equipped with the above-mentioned temperature rising elution fractionation and high-temperature gel permeation chromatography in the system.
0A type) or the like.

The polyethylene resin preferably has one crystal melting peak as measured by differential scanning calorimetry. When there are a plurality of crystal dissolution peaks, since there are a plurality of components having different crystallinities, the viscosity of the molten resin becomes uneven, and when mixed with the inorganic filler, a homogeneous resin composition can be obtained. Since it cannot be performed, strength and elongation characteristics are deteriorated.

The above polyethylene resin preferably has a temperature range from the crystal melting peak temperature measured by differential scanning calorimetry to the end of melting of all crystals within 30 ° C. When the temperature exceeds 30 ° C., the difference in crystallization between the polyethylene molecules having high crystallinity and the polyethylene molecules having low crystallinity increases, and the viscosity of the molten resin becomes uneven, so that a uniform resin composition cannot be obtained. , Strength and elongation characteristics are reduced. More preferably, it is within 25 ° C.

The polyethylene resin preferably has a weight average molecular weight of 1.5 to 3.5 with respect to the number average molecular weight as measured by cross fraction analysis. 1.5
If it is less than 3, the resin does not easily flow at the time of melting and it is difficult to disperse the inorganic filler. If it exceeds 3.5, the abundance ratio of low molecular weight molecules and high molecular weight molecules increases, and the viscosity of the molten resin becomes uneven. As a result, a uniform resin composition cannot be obtained, so that strength and elongation characteristics are reduced.

The above-mentioned polyethylene resin has a temperature range of from 40% by weight elution to 100% by weight elution as measured by the cross-fractionation analysis of 40%.
It is preferable that the temperature be within ° C. If the temperature is higher than 40 ° C., a high-crystalline component and a low-crystalline component are present in the polyethylene resin at the same time, and the viscosity of the molten resin becomes uneven, and a uniform resin composition cannot be obtained. , And elongation characteristics decrease. More preferably, it is 30 ° C. or lower.

Examples of the polypropylene resin include propylene homopolymer, ethylene, 1-butene,
Block copolymers copolymerized with α-olefins other than propylene, such as -pentene, 1-hexene, and 4-methyl-1-pentene; or random copolymers, and particularly, ethylene-propylene block copolymers. Coalescence is preferred.

MFR of the above polypropylene resin (melt flow rate: test temperature 230 ° C., test load 2.16)
When the weight is less than 1 g / 10 min, the dispersibility of the inorganic filler is reduced. When the weight exceeds 60 g / 10 min, the elongation properties of the obtained resin composition are reduced.
/ 10 min is preferred.

Examples of the inorganic filler include talc, calcium carbonate, glass fiber, carbon fiber, barium sulfate, mica, potassium titanate, magnesium sulfate,
Wollastonite, zinc oxide, aluminum borate, fly ash, dehydrated sludge, silica, clay, titanium oxide,
Examples include magnetic powders such as aluminum hydroxide, magnesium hydroxide, sepiolite, iron oxide, carbon black, various ferrites, and metal powders such as copper and iron.

The resin mixture of the present invention comprises 70 to 5% by weight of the polypropylene resin based on 30 to 95% by weight of the polyethylene resin. When the polyethylene resin is less than 30% by weight, not only the inorganic filler cannot be mixed in a large amount, but also the impact resistance and elongation characteristics of the resulting polyolefin resin composition are significantly reduced, and the weight is 95% by weight. If it exceeds, the fluidity of the obtained resin composition decreases, not only the moldability becomes insufficient, but also the rigidity,
Since the effect of improving the physical properties such as dimensional stability is insufficient, it is limited to the above range.

The polyolefin resin composition of the present invention comprises:
It is composed of 100 to 900 parts by weight of the inorganic filler based on 100 parts by weight of the resin mixture. When the amount is less than 100 parts by weight, the effect of improving the physical properties such as rigidity and dimensional stability by the obtained polyolefin resin composition becomes insufficient, and when the amount exceeds 900 parts by weight, the fluidity of the obtained resin composition decreases, Not only is the moldability insufficient, but also the impact resistance and elongation properties are significantly reduced, so that the content is limited to the above range.

As a method for preparing the polyolefin-based resin composition, for example, a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneading roll, a Brabender, a plastograph, a kneader, or the like may be used. A method in which the inorganic filler is mixed and dispersed in a polyethylene resin and a polypropylene resin is exemplified.

The polyolefin resin composition of the present invention comprises:
Although it can be used as it is for processing a molded body, it is preferable to use it as a master batch by diluting it with another resin component. In this case, the polyolefin-based resin composition of the present invention, which has been previously mixed and integrated, and another resin component such as a polyolefin-based resin are dry-mixed to a predetermined blending amount, and the mixture is injection-molded to obtain rigidity and resistance. It is possible to obtain a resin molded body in which various properties such as impact properties are balanced.

The process for producing a resin molded article of the present invention is characterized in that ethylene and an α-olefin are copolymerized using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst and have a density of 0.84.
0.90 g / cm ³ polyethylene resin 30 to 95
Wt. And 100 parts by weight of a resin mixture composed of 70 to 5 wt.
A first step of mixing and integrating the polyolefin resin composition (A) mixed with 0 to 900 parts by weight, and the mixed and integrated polyolefin resin composition (A) 5 to 8
0% by weight and 95 to 20% by weight of the thermoplastic resin (B)
And a second step of mixing and integrating the two.

The first step of mixing and integrating the resin composition (A) includes, for example, a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneading roll, a device such as a brabender, a plastograph, and a kneader. The method can be carried out by mixing and dispersing the inorganic filler in the polyethylene resin.

The thermoplastic resin (B) includes a polyolefin resin, a polyacrylic resin, a polyether resin, a polyester resin, a polyvinyl chloride resin, a polycarbonate resin, a polyamide resin, a polystyrene resin, and a polyphenylene ether resin. And the like. These may be used singly or as a mixture of two or more kinds, and may be copolymers of these or other monomers.

The polyolefin resin is mainly composed of a polymer or copolymer of a monoolefin such as ethylene, propylene or butene. In particular,
High density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene,
Ethylene-propylene block copolymer, ethylene-propylene random copolymer, polybutene-1, poly4-
Methyl-1-pentene and the like are preferably used, and it is particularly preferable to use an ethylene-propylene block copolymer. Further, the same polyethylene-based resin as used in the resin composition (A) of the present invention can be used as a mixture.

In the method for producing a resin molded article according to the present invention, the thermoplastic resin (B) is mixed with the resin composition (A) in an amount of 5 to 80% by weight to 95 to 20% by weight. . When the content of the thermoplastic resin (B) is less than 20% by weight, not only the moldability of the polyolefin resin composition is reduced, but also the rigidity is reduced. On the other hand, if the content exceeds 95% by weight, the impact resistance of the polyolefin-based resin composition decreases, so that the content is limited to the above range.

The second step of mixing and integrating the resin composition (A) and the thermoplastic resin (B) mixed and integrated includes the resin composition (A) mixed and integrated in the first step. ) Is further mixed and dispersed in the thermoplastic resin (B) using the same apparatus as that exemplified in the first step.

In addition, a method of injection molding a mixed composition obtained by dry-mixing the resin composition (A) previously mixed and integrated with the thermoplastic resin (B) to a predetermined blending amount may be used.

Further, when mixing the resin composition (A) and the thermoplastic resin (B), if necessary, an antioxidant, a pigment, an ultraviolet absorber, a flame retardant, a plasticizer, a lubricant, a charge An inhibitor, a dispersant such as a silane compound, and the like may be added. Further, the surface of the inorganic filler, silane-based, titanate-based, aluminate-based, zircoaluminum-based, phosphoric acid-based, carboxylic acid-based, fatty acid-based, fats and oils, waxes, coupling agents such as other surfactants and It can also be treated with a surface treatment agent or the like.

[0041]

The polyolefin resin composition of the present invention comprises a specific polyethylene resin and a polypropylene resin and an inorganic filler. Since the inorganic filler is mixed and finely dispersed at a high level, it can be used for extrusion molding, injection molding, etc. The molded product obtained from the polyolefin-based resin composition is excellent in balance between rigidity and impact resistance, and has good elongation characteristics and dimensional stability.

When a polyolefin resin composition (A) composed of a specific polyethylene resin and a polypropylene resin and an inorganic filler and mixed and integrated in advance is used as a master batch, the specific polyethylene resin is used. A uniform finely dispersed state is achieved in a form coated with an inorganic filler, and the dispersibility in the thermoplastic resin (B), which is a diluting resin, is improved due to the presence of the polypropylene resin. The balance between the properties and the rigidity and impact resistance of the obtained molded body is improved.

Further, by using the polyolefin resin composition (A) as a master batch, it is possible to reduce the cost of the final resin molded product.
In the specific polyethylene resin and polypropylene resin and the resin composition comprising an inorganic filler, the inorganic filler is present in a high-level uniform finely dispersed state,
Since it is possible to prepare a masterbatch containing a large amount of inorganic filler compared to a conventional inorganic filler-containing resin composition, it is possible to more effectively reduce the cost of the final resin molded body .

[0044]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 Metallocene-based polyethylene resin (1): manufactured by Dow Chemical Company (density = 0.870 g / cm ³ , MFR = 5.0 g / 1
0 min) 80 parts by weight Ethylene-propylene block copolymer: 20 parts by weight (MFR = 30 g / 10 min) manufactured by Tokuyama Co., Ltd. Talc: 300 parts by weight (average particle size: 3 μm) manufactured by Nippon Talc Co., Ltd. The mixture was extruded with a single screw extruder, and resin composition (A1) pellets were produced with a hot cut device.

The obtained resin composition (A1) pellets and an ethylene-propylene block copolymer (manufactured by Tokuyama Corporation:
(MFR = 30 g / 10 min) Pellets 26.7 / 7
A bending test piece and an Izod impact test piece were prepared from the mixture dry-blended at a mixing ratio of 3.3 with an injection molding machine (75 ton, manufactured by Nippon Steel Works, Ltd.). The V-notch of the Izod test piece was cut by a notching cutter. Using these test pieces, bending test (JIS K7
203 compliant: bending speed = 2 mm / min), Izod impact test (JIS K7110 compliant: test temperature = 23)
° C). As a result, the flexural modulus was 23,800 kg.
f / cm ² , Izod impact value is 11.3 kgf · cm
/ Cm ² .

Example 2 The mixing ratio of the resin composition (A1) pellets and the ethylene-propylene block copolymer pellets was 40/60.
The procedure was performed in the same manner as in Example 1, except for the following. As a result, the flexural modulus was 28,100 kgf / cm ² and the Izod impact value was 13.8 kgf · cm / cm ² .

Example 3 Metallocene-based polyethylene resin (1): manufactured by Dow Chemical Company (density = 0.870 g / cm ³ , MFR = 5.0 g / 1
0 min) 60 parts by weight Ethylene-propylene block copolymer: 40 parts by weight manufactured by Tokuyama Corporation (MFR = 30 g / 10 min) Talc: 300 parts by weight manufactured by Nippon Talc (average particle size: 3 μm) Resin composition using the above composition The same operation as in Example 1 was carried out except that a product (A2) pellet was prepared and used instead of the resin composition (A1) pellet. As a result, the flexural modulus was 25,200 kgf / cm ² and the Izod impact value was 1
It was 0.4 kgf · cm / cm ² .

Example 4 Metallocene-based polyethylene resin (1): manufactured by Dow Chemical Company (density = 0.870 g / cm ³ , MFR = 5.0 g / 1
0 min) 80 parts by weight Ethylene-propylene block copolymer: 20 parts by weight (MFR = 30 g / 10 min) manufactured by Tokuyama Corporation Talc: 400 parts by weight manufactured by Nippon Talc (average particle size: 3 μm) Resin composition using the above composition A product (A3) pellet was prepared and performed in the same manner as in Example 1 except that the pellet was used instead of the resin composition (A1) pellet. As a result, the flexural modulus was 25900 kgf / cm ² and the Izod impact value was 1
It was 0.2 kgf · cm / cm ² .

Example 5 Metallocene polyethylene resin (2): manufactured by Dow Chemical Company (density = 0.868 g / cm ³ , MFR = 0.5 g / 1)
0 min) 80 parts by weight Ethylene-propylene block copolymer: 20 parts by weight (MFR = 30 g / 10 min) manufactured by Tokuyama Talc: 300 parts by weight (average particle size: 3 μm) manufactured by Nippon Talc Co. Resin composition using the above composition The same procedure as in Example 1 was carried out except that a pellet of the product (A4) was prepared and used instead of the pellet of the resin composition (A1). As a result, the flexural modulus was 23900 kgf / cm ² and the Izod impact value was 1
It was 2.0 kgf · cm / cm ² .

Comparative Example 1 Metallocene-based polyethylene resin (1): manufactured by Dow Chemical Company (density = 0.870 g / cm ³ , MFR = 5.0 g / 1
0 min) 80 parts by weight Ethylene-propylene block copolymer: 20 parts by weight (MFR = 30 g / 10 min) manufactured by Tokuyama Co., Ltd. 30 parts by weight of talc A resin composition (A5) pellet is prepared using the above composition, and a resin composition is prepared. (A1) The same operation as in Example 1 was performed except that the pellets were used instead. As a result, the flexural modulus was 9,800 kgf / cm ² , and the Izod impact test piece did not break.

Comparative Example 2 Metallocene polyethylene resin (1): manufactured by Dow Chemical Company (density = 0.870 g / cm ³ , MFR = 5.0 g / 1
0 min) 80 parts by weight Ethylene-propylene block copolymer: 20 parts by weight (MFR = 30 g / 10 min) manufactured by Tokuyama Corporation 1000 parts by weight of talc An attempt was made to produce pellets using the above composition.
Kneading was difficult and pellet preparation was impossible.

Comparative Example 3 Ethylene-propylene block copolymer: 100 parts by weight, manufactured by Tokuyama Corporation (MFR = 30 g / 10 min) Talc: 300 parts by weight, manufactured by Nippon Talc Co., Ltd. A resin composition (A6) pellet was prepared using the above composition. The procedure was carried out in the same manner as in Example 1 except that a twin screw extruder (manufactured by Ikegai Co., Ltd.) was used and used instead of the resin composition (A1) pellet. As a result, the flexural modulus was 28200 kgf / cm.
^{2. The} Izod impact value was 2.1 kgf · cm / cm ² .

Comparative Example 4 Metallocene-based polyethylene resin (1): 100 parts by weight, manufactured by Dow Chemical Company Talc: 300 parts by weight, manufactured by Nippon Talc Co., Ltd. A resin composition (A7) pellet was prepared using the above composition, and a resin composition was prepared. (A1) The same operation as in Example 1 was performed except that the pellets were used instead. As a result, the flexural modulus was 20200 kgf / cm ² and the Izod impact value was 7.
It was 6 kgf · cm / cm ² .

[0055]

[Table 1]

Table 1 shows the composition, flexural modulus and Izod impact value of the above examples, and Table 2 shows the composition, flexural modulus and Izod impact value of the comparative example. As is clear from these results, the polyolefin resin composition of the present invention has both excellent rigidity and impact resistance.

As described above, the polyolefin-based resin composition of the present invention comprises a specific polyethylene-based resin, a polypropylene-based resin, and an inorganic filler, and the inorganic filler is present in a mixed finely dispersed state. The molded article obtained from the polyolefin resin composition has excellent balance properties of rigidity and impact resistance, and has good elongation properties and dimensional stability. In addition, in order to realize a high-level uniform dispersion state of the inorganic filler, a masterbatch containing a large amount of the inorganic filler as compared with the conventional inorganic filler-containing resin composition, and which can be easily dispersed in the diluting resin. It is possible to more effectively reduce the cost of the final resin composition. Furthermore, according to the method for producing a resin molded article of the present invention, even in a system containing a large amount of an inorganic filler which is advantageous as the master batch, the mixed finely dispersed state of the inorganic filler by a specific polyethylene resin Is achieved, and the dispersibility in the diluent resin is improved by the polypropylene-based resin, so that a resin molded body having excellent balance between rigidity and impact resistance can be obtained.

Claims (2)

[Claims] 1. A resin comprising 30 to 95% by weight of a polyethylene resin and 70 to 5% by weight of a polypropylene resin obtained by copolymerizing ethylene and an α-olefin with a metallocene compound containing a tetravalent transition metal as a polymerization catalyst. Mixture 10
A polyolefin resin composition comprising 100 to 900 parts by weight of an inorganic filler based on 0 part by weight. 2. A resin comprising 30 to 95% by weight of a polyethylene resin obtained by copolymerizing ethylene and an α-olefin with a metallocene compound containing a tetravalent transition metal as a polymerization catalyst, and 70 to 5% by weight of a polypropylene resin. Resin mixture 1
A first step of mixing and integrating a polyolefin resin composition (A) obtained by mixing 100 to 900 parts by weight of an inorganic filler with respect to 00 parts by weight, and the mixed and integrated polyolefin resin composition A method for producing a resin molded product, comprising: a second step of mixing and integrating 5 to 80% by weight of the product (A) and 95 to 20% by weight of the thermoplastic resin (B).