JPH0931268A - Resin composition for blow molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin composition for blow molding excellent in moldability when a large-sized hollow molding is molded, extremely excellent in coating performance, impact resistance, rigidity, heat-resistant rigidity and clarity of a prepared large-sized molding. SOLUTION: This resin composition for blow molding comprises 85-50wt.% of a propylene-α-olefin copolymer having 160-165 deg.C crystal melting point, 0.1-1g/10 minutes melt flow rate (230 deg.C) and 0.895-0.905g/cm<3> density, 5-15wt.% of a high-density polyethylene having 0.06-0.005g/10 minutes melt flow rate (190 deg.C) and 0.945-0.970g/cm<3> density, 5-15wt.% of an ethylene-α-olefin copolymer having 0.01-20g/10 minutes melt flow rate (190 deg.C), 0.880-0.910g/cm<3> density and 110-117 deg.C crystal melting point and 5-20wt.% of talc having <=10μm average particle diameter, and has 0.1-0.8g/10 minutes melt flow rate (230 deg.C).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for hollow molding, and more specifically, it has good moldability during molding of a large hollow molded product, and the coating, impact resistance,
The present invention relates to a hollow molding resin composition having extremely excellent rigidity, heat resistance rigidity, and sharpness.

[0002]

2. Description of the Related Art Automotive exterior parts such as bumpers and spoilers, which require rigidity, paintability, and appearance, are those obtained by injection-molding polypropylene-based resin and then applying primer treatment paintability using an organic solvent, or paint. Hollow molded articles using ABS resin and Noryl resin, which are excellent in properties, have been used. Further, in order to solve problems such as economical efficiency, recyclability, environmental problems, etc. in small-lot production of other kinds in recent years, attention has been paid to the development of hollow molded products using a polyolefin resin.

Polypropylene has many excellent properties such as rigidity, impact resistance, heat resistance, and moldability, and is therefore widely used in hollow molding products obtained by the hollow molding method. , Rigidity, impact resistance, heat resistance, and moldability (drawdown resistance) are further required. Therefore, as described in Japanese Patent Publication No. 6-55868, polypropylene, high-density polyethylene, inorganic filler, and Made of ethylene rubber 1
It is known to use a composition (polyolefin resin) containing 0 to 30% by weight. However, when the composition containing a large amount of a rubber component is used for automobile exterior parts such as bumpers and the like, which have many large-sized molded products, the rigidity of the molded products obtained is low, and the coating process and the use after the molding of the molded products are performed. There remains a problem that shape retention is insufficient and practicability cannot be satisfied.

[0004]

DISCLOSURE OF THE INVENTION The present invention is directed to a hollow molding resin composition, and more specifically, it has good moldability during molding of large hollow products, and the resulting large hollow molded products have coating properties, impact resistance, and An object of the present invention is to provide a resin composition for blow molding, which is extremely excellent in rigidity, heat resistance rigidity and image clarity.

[0005]

The present invention has the following arrangement. (1) Crystal melting point (Tm) is 160 to 165 ° C., melt flow rate (hereinafter sometimes abbreviated as MFR) (2)
30 ℃; 21.18N) 0.1-1g / 10min, density 0.895
~ 0.905 g / cm ³ propylene-α-olefin copolymer (A) 85 to 50% by weight, melt flow rate (19
0 ° C .; 21.18 N) 0.06 to 0.005 g / 10 min, density of 0.945 to 0.970 g / cm ³ high density polyethylene (B) 5 to 15% by weight, melt flow rate (190
℃; 21.18N) 0.01-20g / 10min, density 0.880
~ 0.910 g / cm ³ , crystalline melting point (Tm) 110-117
C. ethylene-α-olefin copolymer (D) 5-15
Talc (E) 5 having a weight% and an average particle size of 10 μm or less
~ 20 wt% melt flow rate (230 ℃; 2
1.18N) 0.1-0.8g / 10min resin composition for blow molding. (2) A hollow molding resin composition in which the talc (E) according to the above-mentioned item 1 contains 5% by weight or less of an inorganic filler other than talc.

A detailed description will be given below. The propylene-α-olefin copolymer (A) used in the present invention has a crystal melting point (Tm) of 160 to 165 ° C. and a melt flow rate (2).
30 ° C; 21.18N) 0.1-1g / 10min, preferably 0.1
~ 0.5g / 10min, density 0.895 ~ 0.905g / cm ³
Is a propylene-α-olefin copolymer, preferably a propylene-α-olefin block copolymer. Molecular weight distribution of the propylene-α-olefin copolymer (M
_w / M _n ) at the same time satisfies the requirements of preventing the discharge amount from decreasing, preventing the surface of the resulting hollow molded product from becoming rough, and preventing the formation of die lines in the hollow molded product due to the deterioration of the uniform meltability of the resin.
The range of 3 to 10 is preferable, and the range of 4 to 8 is more preferable. As the propylene-α-olefin block copolymer, a propylene homopolymer part or a propylene-α-olefin copolymer part having an α-olefin content of 1% by weight or less and 80 to 95% by weight, and an ethylene content of 35 to 65% by weight. % Propylene-ethylene copolymer part or ethylene content 25-45 wt% and C4-10 α-olefin content 10-20 wt% propylene-ethylene-α
An example is a propylene-α-olefin block copolymer composed of 5 to 20% by weight of an olefin copolymerization part.

The method for producing the propylene-α-olefin block copolymer is a known polymerization method of propylene as a main component and ethylene or a C 4-8 α-olefin as a comonomer, for example, a Ziegler-Natta catalyst. Alternatively, a propylene homopolymerization part or an α-olefin content of 1% by weight is obtained by slurry polymerization or gas phase polymerization under a relatively high hydrogen concentration and a relatively low temperature condition using a known reduced or supported high activity catalyst. The following propylene-α-olefin copolymerization part was polymerized, followed by ethylene content of 35-
65% by weight of a propylene-ethylene copolymerization part or an ethylene content of 25 to 45% by weight and a C4 to C10 α-olefin content of 10 to 20% by weight of a propylene-ethylene-α-olefin copolymerization part are polymerized. Can be obtained in any way. The MFR can be adjusted by the amount of hydrogen added.

The crystal melting point (Tm) used herein means a sample of 10 mg in a nitrogen atmosphere at 20 ° C./min using a scanning differential calorimeter.
The peak temperature of the endothermic curve associated with the melting of the crystal obtained by raising the temperature at the above rate is shown (when there are multiple endothermic peaks associated with melting, the higher temperature side is indicated). A composition using a propylene-α-olefin copolymer having an MFR significantly exceeding 1 g / 10 min has a low melt tension and a low drawdown resistance, and is unsuitable for the molding of large hollow moldings.
A composition using a propylene-α-olefin copolymer far below 1 g / 10 min has a high melt viscosity and excellent drawdown resistance, but lacks compatibility with other components, and a die mark is further generated. A composition using a propylene-α-olefin copolymer having a crystal melting point (Tm) of significantly lower than 160 ° C. or a density of significantly lower than 0.895 g / cm ³ has low heat resistance rigidity of the obtained molded article, It is not suitable as a large hollow product because it has poor shape retention and impairs practical properties.

High density polyethylene (B) used in the present invention
Has an MFR (190 ° C; 21.18N) of 0.06 to 0.005g
/ 10 min, the melt tension of the obtained composition is large, the drawdown resistance is excellent, and the compatibility with other components is excellent. Due to the uniform meltability of the obtained composition, a hollow molded product can be obtained without die marks. It is preferably 0.05 because of its excellent appearance.
~ 0.01g / 10min, density 0.945 ~ 0.970g / c
m ^3, preferably a high density polyethylene 0.950~0.970g / cm ^3. The method for producing the high-density polyethylene (B) comprises ethylene or ethylene as a main component and 3% by weight.
Polymerization of the following C3-C8 α-olefins such as propylene, butene-1, hexene-1 using a Ziegler-Natta or Phillips method chromium-based catalyst can be exemplified.

The ethylene-α-olefin copolymer (D) used in the present invention has an MFR (190 ° C; 21.18N) of 0.1.
01 to 20 g / 10 min, the melt tension of the resulting composition is large, the drawdown resistance is excellent, and the compatibility with other components is excellent. In terms of the appearance of the molded product, it is preferably 0.01 to 10 g / 10 min, more preferably 0.1 to 3 g.
/ 10 min, the density is 0.880 to 0.910 g / cm ³ , and the obtained molded product is preferably 0.880 to 0.900 in terms of coatability (adhesion strength with paint), heat resistance rigidity and shape retention.
g / cm ^3, more preferably 0.880~0.895g / cm ^3, (adhesion strength between the coating) coating of moldings crystalline melting point (Tm) is obtained as well as 110 in terms of heat rigidity and shape retention ~
It is an ethylene-α-olefin copolymer having a temperature of 117 ° C.
Examples of the α-olefin include α-olefins having 3 to 8 carbon atoms such as butene-1 and hexene-1. The content of α-olefin in the ethylene-α-olefin copolymer is preferably 5 to 40% by weight, more preferably 5
３０30% by weight.

In the method for producing the ethylene-α-olefin copolymer, ethylene is used as a main component and α-olefins having 3 to 8 carbon atoms such as butene-1 and hexene-1 are used with a Ziegler-Natta catalyst. A method of polymerizing by an ionic polymerization method can be exemplified.

The talc (E) used in the present invention is talc having an average particle size of 10 μm or less, more preferably 5 μm, and further preferably 2 μm or less. The specific surface area (JIS K5101) of the talc (E) is preferably 17,000 cm ² / g or more,
In terms of impact resistance of the resulting hollow molded product, the particle size component exceeding 10 μm is preferably 5% by weight or less, more preferably 1% by weight or less. In addition, the components of talc are complex depending on the place of origin, and the characteristics of the hollow molded product obtained differ depending on the component. Therefore, in terms of rigidity, it is preferable that the MgO component is 30% by weight or more and the SiO ₂ component is 60% by weight or more. The Fe ₂ O ₃ component, which is an impurity, is preferably 1% by weight or less, and the CaO component is preferably 1% by weight or less in terms of appearance (does not generate voids or avatars on the surface of the molded product).

The present invention provides the resulting hollow molded article with impact resistance,
For the purpose of further improving heat resistance rigidity and dimensional stability, talc having an average particle size of 10 μm or less and containing 5% by weight or less of an inorganic filler other than talc can be used. Examples of the inorganic filler other than talc include calcium carbonate, potassium titanate whiskers, mica, calcium silicate, glass fiber and the like. The inorganic filler is used for the purpose of improving impact resistance, heat resistance rigidity and dimensional stability of the resulting hollow molded product, and as it is (untreated)
However, it is also possible to use those treated with a silane coupling agent or the like in order to increase the improving effect.

The calcium carbonate has a specific surface area of 8,000 cm ² / g or more and an average particle size of 3 μm or less and 10 μm.
If the particle size component exceeding m is 5% by weight or less, it can be used without problems. As the potassium titanate whiskers,
Average fiber diameter 0.2-1.5 μm, average fiber length 10-50 μm
m whiskers can be used without problems. The mica having an average flake diameter of 200 to 40 μm and an aspect ratio of 30 to 70 can be used without any problem. As the calcium silicate, any acicular crystal having an average fiber diameter of 4 to 15 μm and an average fiber length of 50 to 150 μm can be used without any problem.

The glass fiber has an average fiber diameter of 4 to 1
3 μm, fiber length 0.2 to 6 mm, preferably 0.5 to 1.5
Material in mm. The blow molding resin composition of the present invention comprises a propylene-α-olefin copolymer (A) 85-
50% by weight, preferably 75-60% by weight, high-density polyethylene (B) 5-15% by weight, preferably 5-15% by weight, ethylene-α-olefin copolymer (D) 5-1
MFR (230 ° C; 21.18N) consisting of 5% by weight, preferably 15-10% by weight and talc (E) 5-20% by weight, preferably 10-15% by weight is 0.1-0.8 g / 10m
It is a hollow molding resin composition of in.

A composition in which the compounding ratio of the propylene-α-olefin copolymer (A) greatly exceeds 85% by weight is
From the viewpoint that the moldability and the balance of the coatability and the rigidity of the obtained hollow molded product are lowered, the composition significantly lower than 50% by weight is decreased in the heat resistance rigidity of the obtained molded product and the shape retention property is decreased. Not preferable. A composition in which the compounding ratio of the high-density polyethylene (B) greatly exceeds 15% by weight is
The composition lacking in compatibility shows a decrease in adhesion and weld strength at the pinch-off portion, and a composition much lower than 5% by weight is not preferable because the drawdown resistance is not excellent.

The composition in which the blending ratio of the ethylene-α-olefin copolymer (D) greatly exceeds 15% by weight is
A composition of much less than 5% by weight is not preferable because the resulting hollow molded product has low rigidity and lacks in shape retention, and the adhesive strength between the obtained hollow molded product and the coating composition is reduced. The composition in which the compounding ratio of the talc (E) greatly exceeds 20% by weight is 5% by weight in that the hollow molded product obtained has low pinch-off strength and weld strength and is not excellent in impact resistance.
A composition much lower than is not preferable because the rigidity of the obtained molded product is low. Incidentally, for the hollow molding composition, in addition to the components described above, a phosphorus-based antioxidant and a phenol-based antioxidant as a stabilizer, a neutralizing agent, a weathering agent, an ultraviolet absorber, an antistatic agent, a coloring Agents, crystal nucleating agents, olefinic elastomers, ethylene vinyl acetate copolymers, polypropylene homopolymers, ethylene-propylene crystalline random copolymers, etc. can be added within a range that does not impair the object of the present invention.

The hollow molding composition of the present invention is obtained by mixing the above-mentioned components. For mixing these components, a conventional mixer such as a Henschel mixer (trade name) or a super mixer (trade name) with a high-speed stirrer, a ribbon blender, or a tumbler may be used. When melt-kneading is required, a usual single-screw extruder or twin-screw extruder is used. Kneading temperature is 200
-300 degreeC is common, Preferably it is 230-270.
° C.

As a method for obtaining a large hollow container using the hollow molding composition (E) of the present invention, a direct blow molding method can be mentioned. As this direct blow molding method, the blow molding composition of the present invention is melt extruded into a parison using an extruder set to 190 to 230 ° C., and if necessary, preblown to perform blow molding at 60 ° C. or lower. The mold is a mold for which the air is removed from the mold surface, and the parison is installed in the mold to blow pressurized air (0.05 to 0.1 MPa) from the air nozzle into the mold to fix the shape. It is possible to exemplify a molding method in which air pressure is applied until the temperature reaches 100%. The large hollow molded articles obtained by these methods have excellent shape stability and good appearance. By further sanding after this, a better smooth surface can be obtained.

The coating material used in the coating process is a two-component type urethane-based coating material after applying and drying a polypropylene primer, and then a clear coating material and drying at room temperature.
It was baked at 40 ° C. for 40 minutes. It should be noted that the coating material is not limited to the presence or absence of the primer as long as it is a coating material used for polypropylene or a coating material developed for polypropylene, and the coating method is a spray method.

[0021]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited by these specific examples. The following methods were used to evaluate the properties used in the following examples and comparative examples. (1) Crystal melting point (abbreviation: Tm): A 10 mg sample was measured from a room temperature (23 ° C.) at a heating rate of 20 ° C./min under a nitrogen atmosphere using a scanning differential calorimeter (abbreviation: DSC). It is expressed as the peak temperature of the endothermic curve (unit: ° C) accompanying the melting of. (2) Density: Measured based on JIS K7112 (1980) test condition D method (density gradient tube method) (unit: g / c)
m ^3).

(3) MFR (230 ° C .; 21.18N), (abbreviation MFR−): Measured based on MFR test condition 14 of JIS K7210 (unit: g / 10 min). (4) MFR (190 ° C; 21.18N), (abbreviation MFR-): Measured based on MFR test condition 4 of JIS K7210 (unit: g / 10 min). (5) Molecular weight distribution (abbreviation ∋w / ∋n): Gel permission chromatography method. Device: GPC-150 (WA
Made by TERS). Column used = (brand name) PSK gel GMH-HT (manufactured by Tosoh Corporation) [Conditions] solvent = ortho-dichlorobenzene, sample concentration = 0.5 mg /
ml, measurement temperature = 135 ℃

(6) Mooney viscosity [ML1 + 4 (100 ° C.)]:
Conforms to JIS K6300. (7) Rigidity: The flexural modulus is measured according to the test method of JIS K7203. (◎ = 230MPa or more, ○ = 200M
Pa or more, Δ = 180 MPa or more, × = 180 MPa or less). Standard test piece dimensions (100 x 10 x 4 mm) were adopted (Unit MP
a). (8) Moldability: Molding temperature 210 ° C., parison wall thickness uniformly extruded, mold temperature 30 ° C. Product weight 900 g, length 600 mm when molded into a molded product, drawdown property was evaluated by wall thickness variation ( ◎ = There is almost no uneven thickness in the upper and lower sides, ○ = Slight drawdown is observed, the upper and lower wall thickness fluctuations are within 5%, △ = Drawdown occurs and the vertical wall thickness fluctuations are 5 to 20.
% Occurs. X = Large drawdown, 20% or more variation in wall thickness above and below).

(9) Polishability: 320 in a room at 23 ± 2 ° C.
Grind 50 times with No. sandpaper (○ = resin is shaving into powder, × = resin is sticky and cutting spots are generated). (10) Adhesion: In accordance with JIS K5400 (section 6.15), a cutter knife was used to make orthogonal cuts at 1 mm intervals in a coating test piece, and 100 squares were created in 1 cm ^2. Adhere the cellophane tape to and peel off one end of the cellophane tape at a right angle to the sample surface (Judgment ◎ = No peeling on the grid-like coating, ○ = Peeling on 5% or less of the grid-like coating Is observed, Δ = 5 to 10% peeling of the checkerboard-like coating film is observed, × = Peeling is seen in 10% or more of the checkerboard-like coating film). (11) Visibility: A fixed position (2 to 3) from the coated molded product.
The fluorescent lamp in m) is turned on, and the sharpness of the fluorescent lamp is visually determined. (○ = Good, △ = Slightly inferior, X = Inferior)

The polymers, copolymers, talc and glass fibers used in Examples and Comparative Examples are abbreviated as follows. PP-1: 88% by weight of propylene homopolymer and 12% by weight of propylene-ethylene copolymer having 61% by weight of ethylene component, MFR-0.35 g / 10min, melting point of 165 ° C, molecular weight distribution ( Propylene-ethylene block copolymer having M _w / M _n ) of 7.4 and a density of 0.902 g / cm ³ . PP-2: 84% by weight of a propylene-ethylene copolymerization part having an ethylene component content of 0.4% by weight and 16% by weight of a propylene-ethylene copolymerization part having an ethylene component content of 48% by weight have an MFR of 0. 75g / 10min, crystal melting point is 1
57 ° C., molecular weight distribution (M _w / M _n ) is 5.5, density is 0.90
1 g / cm ³ propylene-ethylene block copolymer. PP-3: Propylene homopolymerization part 87 wt% and ethylene component content 61 wt% Propylene-ethylene copolymerization part 13 wt% MFR-1.9g / 10min, crystal melting point 165 ° C, molecular weight distribution ( _Mw / _Mn ) is 5.9, density is 0.902 g / cm ³ , and propylene-ethylene block copolymer.

PE-1: butene-1 content 0.49% by weight,
MFR-0.01g / 10min, butene-1 content 0.4
9% by weight, a high density polyethylene having a density of 0.960 g / cm ³ and a crystal melting point of 134 ° C. PE-2: Butene-1 content 1.1% by weight, MFR-0.
03g / 10min, density 0.950g / cm ³ , crystal melting point 131
High-density polyethylene at ℃. LE-1: MFR 0.8g / 10min, crystal melting point 113
Low density polyethylene with a density of 0.890 g / cm ³ at ℃. LE-2: MFR-4g / 10min, crystal melting point 115 ° C,
Low density polyethylene with a density of 0.900 g / cm ³ . LE-3: Propylene content is 27% by weight essentially amorphous, density 0.860 g / cm ³ , Mooney viscosity ML1 + 4 (1
Ethylene / propylene copolymer rubber with a temperature of 00 ° C) of 52 and an MFR of 0.7g / 10min.

F-1: Specific surface area 44,000 cm ² / g. An average particle size of 1.6 μm, 0.5% by weight of components having a particle size of 10 μm or more,
33.1% by weight of MgO component, 62.5% by weight of SiO ₂ component,
Talc with an Fe ₂ O ₃ content of 0.3% by weight and a CaO content of 0.15% by weight. F-2: Specific surface area 12,000 cm ² / g, average particle size 9.6μ
m, particle size of 10 μm or more 65.5% by weight, MgO component 33.1% by weight, SiO ₂ component 62.5% by weight, Fe ₂ O ₃ component 1.73% by weight and CaO component 1.05% by weight. talc. F-3: Glass fiber having an average fiber diameter of 10 μm and a fiber length of 1.5 mm.

(Examples 1 to 9 and Comparative Examples 1 to 6) PP-1, 2,
3, PE-1,2, LE-1,2,3, F-1,2,3 in parts by weight shown in Table 1 below and tetrakis [methylene (3.5 g
0.1 parts by weight of t-butyl 4-human oxy- human oxycinnamate)] methane,
0.05 parts by weight of tris (2.4-t-butylphenyl) phosphite and 0.05 parts by weight of calcium stearate were mixed and uniformly mixed in a Henschel mixer, then melt-kneaded by an extruder at 230 ° C., cooled and cut into pellets. It was made into the composition of the shape. This composition is supplied to an extruder for blow molding, and a molten parison is extruded at an extrusion temperature of 210 ° C., and this parison is placed in a blow mold having a mold temperature of 30 ° C. to measure 200 × 600 × 30 m.
m hollow molded product was molded. The average thickness of the body is 3.1 mm. This hollow molded product is subjected to sanding processing, a primer for polypropylene (thickness 20 to 30 μm) is applied and dried, and then a two-component type urethane-based paint (thickness 20 to
(30 μm) Further, a clear coating (20 to 30 μm) was applied, dried at room temperature, and baked at 80 ° C. for 40 minutes.

As can be seen from the table, Examples 1 to 6 in which the hollow molding composition of the present invention was obtained have excellent moldability, rigidity, sanding property before coating, adhesion strength of coating film, and clear coating film. It is possible to obtain a hollow molded article having excellent appearance and good appearance. Example 7 is an example in which a substantially amorphous ethylene-α-olefin copolymer was blended. If the blending ratio of the substantially amorphous ethylene-α-olefin copolymer is smaller than this, the moldability without impairing the object of the present invention,
It is possible to obtain a hollow molded product having excellent rigidity and excellent sanding property before coating, adhesion strength of coating film, and sharpness of coating film. On the other hand, in Comparative Examples 1 to 6, any one of the moldability, the polishing property, the rigidity, the adhesion of the coating film, and the sharpness of the coating film is low and not excellent.

Example 8: 73 parts by weight of PP-1, 7 parts by weight of PE-1, 10 parts by weight of LE-1, 10 parts by weight of F-1, MFR-1.5 g / 10 min, density 5 parts by weight of an acrylic acid-modified polypropylene resin having a composition of 0.905 g / cm ³ , a crystal melting point of 166 ° C., and an acrylic acid content of 2.5% by weight, tetrakis [methylene (3.5-t-butyl-4-human-oxyloxy-hitoxycinnamate]. )] Add methane to 0.
1 part by weight, 0.05 parts by weight of tris (2.4-t-butylphenyl) phosphite and 0.05 parts by weight of calcium stearate were mixed and uniformly mixed in a Henschel mixer, and then melt-kneaded by an extruder at 230 ° C. and cooled. The composition was cut into pellets. The obtained composition was molded into a hollow molded article in the same manner as in Example 1 and each evaluation was performed. Compared with the hollow molded article obtained in Example 1, improved rigidity was observed and moldability,
As to the polishing property, the adhesion property, and the sharpness, the same excellent results as in Example 1 were obtained.

Example 9: 73 parts by weight of PP-1, 7 parts by weight of PE-1, 10 parts by weight of LE-1, 10 parts by weight of F-1, MFR-2.3 g / 10 min, density of 0.1. 903 g / cm ³ , crystal melting point 165
C., 5 parts by weight of a maleic acid-modified polypropylene resin having a maleic acid content of 0.4% by weight, tetrakis [methylene (3.5-g-t-
0.1% by weight of methane, 0.05 parts by weight of tris (2.4-t-butylphenyl) phosphite and 0.05 parts by weight of calcium stearate and uniformly mixed with a Henschel mixer. After that, the mixture was melt-kneaded with an extruder at 230 ° C., and cut by cooling to obtain a pelletized composition. The obtained composition was molded into a hollow molded article in the same manner as in Example 1 and each evaluation was performed. As compared with the hollow molded article obtained in Example 1, the rigidity was improved and the moldability, polishing property, adhesiveness, and image clarity were as excellent as those in Example 1.

[0032]

EFFECTS OF THE INVENTION The hollow molded article obtained by the present invention has an excellent coating appearance and heat-resistant rigidity, satisfies the market demands for good appearance and high rigidity, and is a blow molded product of conventional polyphenylene oxide or ABS resin. It has a good appearance that is not inferior to that of a molded product, its gloss is extremely uniform, and it has a good appearance and can be advantageously used for various applications such as large automobile parts such as automobile air spoilers and bumpers, and for general industry.

[0033]

[Table 1]

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C08L 23/08 C08L 23/08 // B29K 23:00 B29L 22:00

Claims (2)

[Claims] 1. A crystalline melting point (Tm) of 160 to 165 ° C. and a melt flow rate (230 ° C .; 21.18N) of 0.1 to 1 g / 10.
min, density 0.895 to 0.905 g / cm ³ propylene-
85 to 50% by weight of α-olefin copolymer (A), melt flow rate (190 ° C; 21.18N) of 0.06 to 0.0
05g / 10min, density of 0.945 to 0.970g / cm ³ of high density polyethylene (B) 5 to 15% by weight, melt flow rate (190 ° C; 21.18N) of 0.01 to 20g / 10min, density of 0.880-0.910 g / cm ³ , crystal melting point (Tm) is 1
Melt flow rate (230 ° C; 21.18N) consisting of 5 to 15% by weight of an ethylene-α-olefin copolymer (D) at 10 to 117 ° C and talc (E) having an average particle diameter of 10 µm or less. ) Is 0.1 to 0.8 g / 10 min. 2. A hollow molding resin composition, wherein the talc (E) according to claim 1 contains 5% by weight or less of an inorganic filler other than talc.