JPH06228376A - Polyolefin resin composition - Google Patents

Abstract

PURPOSE:To provide a compsn. which is excellent in hardness, stiffness, impact resistance, appearance, and dimensional stability. CONSTITUTION:The compsn. is prepd. by mixing 40-95.5wt.% polyolefin resin having an m.p. of 170 deg.C or lower, 4-40wt.% platy inorg. filler, and 0.5-20wt.% synthetic org. fiber having an m.p. of 200 deg.C or higher, a diameter of 0.5-100mum, and a length of 1-30mm at a temp. lower than the m.p. of the fiber. An acid- modified polyolefin resin is added further to the compsn., as necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin resin composition and a resin composition, and more particularly to forming a molded article excellent in hardness, rigidity, impact resistance, heat resistance, appearance and dimensional stability. The present invention relates to a polyolefin resin composition and a resin composition that can be used.

[0002]

2. Description of the Related Art Conventionally, in order to improve heat resistance and rigidity of a polyolefin resin, a technique of mixing a plate-like inorganic filler with the polyolefin resin has been already known, and it has been widely used in automobile materials and other materials. Such technology is utilized in many fields.

However, a molded product of a polyolefin resin composition obtained by adding a plate-like inorganic filler to a polyolefin resin has a problem such as reduced impact resistance.

In order to solve such a problem of deterioration in impact resistance, it is generally practiced to add an elastomer or the like to the polyolefin resin composition filled with the plate-like inorganic filler.

In this case, however, the molded article of the polyolefin resin composition containing the elastomer has a reduced surface hardness and a reduced heat resistance, instead of improved impact resistance.
Another problem occurs that rigidity and the like are reduced.

Further, in order to improve the impact resistance of the polyolefin resin composition filled with the plate-like inorganic filler, it has been considered to add glass fiber.

However, when glass fiber is added, a molded article of a polyolefin resin composition containing the glass fiber has an improved Izod impact strength, but a reduced surface impact resistance and a reduced appearance and dimensional stability. Another new problem arises.

Therefore, there is a strong demand for the development of a technique for improving the impact strength without lowering the excellent rigidity and heat resistance of the polyolefin resin composition filled with the plate-like inorganic filler.

The present inventors have found that the polyolefin resin composition filled with a plate-like inorganic filler has an excellent feature that the impact strength is reduced without decreasing the dimensional stability, surface smoothness, rigidity and hardness. Improve, further as a result of intensive studies for the purpose of completing the invention to improve the rigidity, a specific shape organic fiber having a melting point higher than the melting point of the polyolefin resin in the polyolefin resin and the plate-like inorganic filler, It has been found that the above object can be achieved by forming a composite at a temperature equal to or lower than the melting point.

That is, an object of the present invention is to provide a polyolefin resin composition and a resin composition capable of forming a molded article excellent in hardness, rigidity, impact resistance, heat resistance, appearance and dimensional stability. With the goal.

[0011]

The invention according to claim 1 for solving the above-mentioned problems comprises a polyolefin resin having a melting point of 170 ° C. or lower of 40 to 95.5% by weight, and a plate-like inorganic filler 4 to 40. % By weight, melting point of 200 ° C. or higher, fiber diameter of 0.5 to 100 μm, fiber length of 1 to
0.5 to 20% by weight of synthetic organic fiber having a size of 30 mm,
A polyolefin resin composition obtained by kneading at a temperature equal to or lower than the melting point of the synthetic organic fiber. The invention according to claim 2 constitutes the polyolefin resin composition according to claim 1. A resin composition containing 100 parts by weight of the entire components and 0.01 to 10 parts by weight of an acid-modified polyolefin resin.

The present invention will be described in detail below.

The melting point of the polyolefin resin in the present invention is 170 ° C. or less. When the melting point of the polyolefin resin to be blended exceeds 170 ° C., the kneading operation with other components, particularly synthetic organic fibers, becomes difficult.

The melting point of the polyolefin resin can be determined according to the method specified in JIS K7121. The melting point measuring method defined in JIS K7121 is simply as follows. That is, a sample of about 5 mg was collected with an analytical balance, the sample was packed in a container, and the condition was adjusted in the standard temperature state 2nd class and the standard humidity state 2nd class specified in JIS K7100.
Load in SC or DTA equipment, heat and melt to a temperature about 30 ° C higher than the end of the melting peak, and
Hold for 0 minutes, then cool at a cooling rate of 10 ° C / min to a temperature at least about 50 ° C below the emerging transition peak. In the obtained DTA curve or DSC curve,
The peak of the melting peak is the melting peak temperature.

Examples of the polyolefin resin in the present invention include high-density polyethylene, medium-density polyethylene, propylene homopolymer, propylene-ethylene copolymer, propylene-α-olefin copolymer, polybutene-1 and the like. it can. In the present invention, the melting point of the various polyolefin resins is 17
A resin having a temperature of 0 ° C. or lower can be appropriately selected and one kind thereof can be used alone, or two or more kinds thereof can be used in combination.

In the present invention, the melting point is 170.
A preferable polyolefin resin having a temperature of not higher than 0 ° C. has a melt index (MI) of 10 g / 10 minutes or more, preferably 15 g / 10 minutes or more.

The MI of the polyolefin resin is 10 g / 10
If it is at least minutes, the object of the present invention can be achieved, in particular, the polyolefin resin composition of the present invention and the fluidity at the time of molding and processing the resin composition become appropriate, and large molding such as automobile parts is achieved. It is possible to easily and surely perform the molding process of the product, and it is possible to suppress appearance defects such as flow marks.

One of the preferred polyolefin resins having a melting point of 170 ° C. or less in the present invention is ¹³ C-
Mmmm in the pentad fraction measured by NMR
A polypropylene having a fraction of 97% or more, particularly 97.5% or more.

When the mmmm fraction is 97% or more, the object of the present invention can be achieved well, and especially the rigidity, heat resistance and the like are further improved.

The mmmm fraction in the pentad fraction measured by ¹³ C-NMR can be measured as follows.

That is, the pentad fraction means A. Zam
belli et al., Macromolecules. 6 , 925 (197)
3) is the isotactic fraction in pentad units in the polypropylene molecular chain measured by the method disclosed in 3), that is, the method using a nuclear magnetic resonance ( ¹³ C-NMR) spectrum with isotope carbon. In other words, the isotactic pentad fraction is the fraction of propylene monomer units at the center of a chain in which five propylene monomer units are continuously meso-bonded. However, regarding attribution of peaks, the method is described in Macromolecules. 8 , 687 (1975). Specifically, the isotactic pentad unit was measured as the intensity fraction of the mmmm peak in all the absorption peaks in the methyl carbon region of the ¹³ C-NMR spectrum.

The plate-like inorganic filler in the present invention is not particularly limited, and specific examples thereof include magnesium hydroxide, aluminum hydroxide, kaolin clay, bentonite, sericite, montmorillonite, barite (barium sulfate), and sunflower. Examples thereof include stone, talc, mica, glass flakes and the like.

One of the above-mentioned various plate-like inorganic fillers may be used alone, or two or more thereof may be used in combination.

The preferred plate-like inorganic filler in the present invention has an average particle size of 0.3 to 100 μm, and particularly preferably 0.1.
It is 5 to 80 μm.

When the average particle size of the plate-like inorganic filler is within the above range, it has the advantages that the appearance is good, the rigidity is high, and the impact strength is not significantly reduced, which is particularly preferable.

Among the various inorganic fillers mentioned above, talc,
Mica and the like are preferable. In particular, the Blaine specific surface area is 25,000 cm ² / g or more, and particularly 30,000
Talc of 0 cm ² / g or more and an average particle size of 30 to
80 μm mica is preferred. When the Blaine specific surface area of talc is not less than the above value, the effect of suppressing the decrease in impact strength and improving the rigidity are particularly large. Further, when the average particle size of mica is within the above range, the effect of improving the rigidity is remarkable, and the dimensional stability is increased.

Here, the Blaine specific surface area is JIS R
It can be determined according to the "powder test" in "Physical test method for cement" in 5201.

The synthetic organic fiber in the present invention needs to have a melting point of 200 ° C. or higher. Melting point 170 ° C
When the polyolefin resin composition of the present invention or the resin composition of the present invention containing the following olefin resin is molded and processed, the synthetic organic fiber remains as it is without melting, and the melting point of the molded product is 200 ° C. or more. This synthetic organic fiber sufficiently fulfills its role as a reinforcing agent.

Materials for forming synthetic organic fibers having a melting point of 200 ° C. or higher include polyamides such as 66-nylon and 6-nylon, polyesters such as polyethylene terephthalate and polybutylene terephthalate, p-hydroxybenzoic acid and 6-hydroxy. Examples include polyarylates such as wholly aromatic polyesters including random copolymers with 2-naphthoic acid, polyether sulfones, polymethylpentene-1, SPS, polycarbonates, polyether ether ketones and the like. . In addition to these, engineering plastics or spar engineering plastics having a melting point of 200 ° C. or higher and having a fiber-forming ability also have a melting point of 2 or less.
It can be used as a material for forming synthetic organic fibers having a temperature of 00 ° C or higher.

The synthetic organic fiber having a melting point of 200 ° C. or more used in the present invention has a fiber diameter of 0.5 to
The thickness is preferably 100 μm, and particularly preferably 1 to 50 μm. When the fiber diameter is in the above range, the synthetic organic fibers are sufficiently impregnated with the polyolefin resin or the acid-modified polyolefin resin, and the dispersion of the synthetic organic fibers in the polyolefin resin becomes good, and the polyolefin resin composition or resin The appearance of the surface of the molded article of the composition is further improved without causing defective appearance due to pills, and the impact resistance is further improved.

The fiber length of the synthetic organic fiber having a melting point of 200 ° C. or higher used in the present invention is preferably 1 to 30 mm, and particularly preferably 2 to 20 mm. When the fiber length is within the above range, in the obtained polyolefin resin composition and resin composition, the dispersion in the polyolefin resin becomes good, and as a result, various properties including impact resistance of the molded product are obtained. Is improved.

The melting point used in the present invention is 200.
A synthetic organic fiber having a temperature of ℃ or higher has a rigidity of 20,000.
100,000 kg / cm ² , especially 25,000-5
It is preferably 50,000 kg / cm ² . When the rigidity of the synthetic organic fiber is within the above range, a molded product of the polyolefin resin composition or the molded product of the resin composition having a large effect of improving impact resistance and having a large rigidity can be obtained.

The polyolefin resin composition of the present invention comprises
A polyolefin resin having a melting point of 170 ° C. or lower, a plate-like inorganic filler, a melting point of 200 ° C. or higher, and a fiber diameter of 0.
It is a composition containing a synthetic organic fiber having a fiber length of 5 to 100 μm and a fiber length of 1 to 30 mm.

In this case, the content of the polyolefin resin is usually 40 to 95.5 based on the total amount of the polyolefin resin, the plate-like inorganic filler and the synthetic organic fiber.
%, Preferably 50 to 90% by weight. When the content of the polyolefin resin is within the above range, moldability, impact resistance, rigidity and heat resistance are particularly good. The content of the plate-like inorganic filler is usually 4 to 40% by weight, preferably 5 to 3 with respect to the total amount of the polyolefin resin, the plate-like inorganic filler and the synthetic organic fiber.
It is 0% by weight. When the content of the plate-like inorganic filler is within the above range, the rigidity, heat resistance, and dimensional stability are particularly good, and the moldability, flow mark and weld appearance, and impact resistance are also particularly good. is there. The content of the synthetic organic fiber is usually 0.5 to 2 with respect to the total amount of the polyolefin resin, the plate-like inorganic filler, and the synthetic organic fiber.
It is 0% by weight, preferably 1 to 15% by weight. When the content of the synthetic organic fiber is within the above range, the surface appearance is further improved due to particularly good dispersion of the synthetic organic fiber in the polyolefin resin, and the polyolefin resin composition of the present invention is used. Stable molding can be performed.

The polyolefin resin composition of this invention is
A polyolefin resin having a melting point of 170 ° C. or lower, a plate-like inorganic filler, a melting point of 200 ° C. or higher, and a fiber diameter of 0.
It is important to contain the synthetic organic fiber having a fiber length of 5 to 100 μm and a fiber length of 1 to 30 mm in specific ratios, respectively, but containing various other components within a range not impairing the object of the present invention. May be. Examples of such other components include a lubricant, an antioxidant, an antistatic agent, an ultraviolet absorber, a flame retardant, a release agent, and a colorant.

Here, examples of the lubricant include hydrocarbon lubricants such as liquid paraffin, natural paraffin and wax; higher fatty acids such as stearic acid, palmitic acid, oleic acid, myristic acid and behenic acid, and fatty acids such as oxyfatty acids. System lubricants: stearic acid, palmitic acid,
Fatty acid ester type which is a lower alkyl ester such as methyl, ethyl, propyl and butyl of higher fatty acid such as oleic acid, myristic acid and behenic acid; aliphatic higher or lower alcohol, alcohol type lubricant such as polyglycol; calcium stearate, Examples thereof include metal soap such as barium stearate; silicon oil such as silicone oil and modified silicone.

Examples of the antioxidant include 2,6
-Di-t-butyl-p-cresol, butylated hydroxyanisole, 2,6-di-t-butyl-4-ethylphenol, stearyl-β- (3,5-di-t-butyl-4-hydroxyphenyl) ) Propionate, 2,2-
Methylenebis (4-methyl-6-t-butylphenol), 2,2-methylene-bis- (4-ethyl-6-t
-Butylphenol), 4,4-thiobis (3-methyl-6-t-butylphenol), 4,4-butylidenebis- (3-methyl-6-t-butylphenol), tetrakis {methylene-3- (3,5- Di-t-butyl-4
-Hydroxyphenyl) propionate} methane, 1,
1,3-tris- (2-methyl-4-hydroxy-5-
phenol-based compounds such as t-butylphenyl) butane, amine-based compounds such as phenyl-β-naphthylamine, N, N-diphenyl-p-phenylenediamine,
Phosphorus compounds such as tris (nonylphenyl) phosphite, triphenylphosphite, trioctadecylphosphite, diphenylisodecylphosphite, dilaurylthiodipropionate, dimyristylthiodipropionate, distearylthiodipropionate Examples thereof include sulfur compounds.

Examples of the antistatic agent include nonionic antistatic agents such as polyoxyethylene alkylamines and polyoxyethylene alkylamides, anionic antistatic agents such as alkyl sulfonates and alkylbenzene sulfonates, and quaternary antistatic agents. Ammonium chloride,
Examples thereof include cationic antistatic agents such as quaternary ammonium sulfate, and amphoteric antistatic agents such as alkylbetaine type and alkylimidazoline type.

Examples of the ultraviolet absorber include salicylic acid type ultraviolet absorbers such as phenyl salicylate and pt-butylphenyl salicylate, and benzophenone type ultraviolet absorbers such as 2,4-dihydroxybenzophenone and 2-hydroxy-4-methoxybenzophenone. Absorbent, 2-
Examples thereof include (2-hydroxy-5-methylphenyl) benzotriazole and 2- (2-hydroxy-5-t-butylphenyl) benzotriazole-based UV absorbers.

Examples of the flame retardant include polytribromostyrene, decabromodiphenyl ether, halogen-based flame retardants such as tetrabromobisphenol A, ammonium phosphate, tricresyl phosphate, triethyl phosphate, and acidic phosphate ester. Examples include phosphorus-based flame retardants, inorganic flame retardants such as tin oxide and antimony trioxide.

Examples of the releasing agent include carnauba wax, paraffin wax, silicone oil and the like.

As the colorant, an ordinary colorant used for coloring plastics can be used.

The polyolefin resin composition of the present invention comprises
It is important to contain the specific polyolefin resin, the plate-like inorganic filler and the specific synthetic organic fiber, but the object of the present invention cannot be achieved by simply mixing these. In order to achieve the object of the present invention and obtain a polyolefin resin composition having the technical effect referred to in the present invention, the specific polyolefin resin, the plate-like inorganic filler, and the specific synthetic organic fiber are kneaded at a specific temperature. This is very important. That is, the polyolefin resin composition of the present invention comprises the specific polyolefin resin, the plate-like inorganic filler, and the specific synthetic organic fiber at a temperature equal to or lower than the melting point of the synthetic organic fiber, particularly the melting point of the polyolefin resin having a melting point of 170 ° C. or less. The kneading is performed while heating in the temperature range above and below the melting point of the synthetic organic fiber.

When the kneading is carried out in the above temperature range, the fiber shape of the synthetic organic fiber is not destroyed, and the synthetic organic fiber and the plate-like inorganic filler are combined to further enhance the reinforcing effect. If the kneading is carried out at a temperature higher than the melting point of the synthetic organic fiber, the synthetic organic fiber will be melted during the kneading, so that the technical meaning of containing a substance having a specific shape called the synthetic organic fiber is lost. Can not achieve the purpose of.

Prior to kneading, it is preferable to mix a specific polyolefin resin, a plate-like inorganic filler and a specific synthetic organic fiber. For this mixing, a conventionally known mixer such as a ribbon blender, a tumble mixer, a Henschel mixer, or a V-type blender can be used. However, although it is preferable to mix the specific polyolefin resin, the plate-like inorganic filler and the specific synthetic organic fiber at once, in some cases, it is not always necessary to mix these three components at once, and the above-mentioned kneader is added to the kneader. The three components may be added at once or sequentially and kneaded.

For kneading, a conventionally known kneader can be used. Examples of the kneader include an open roll, a Banbury mixer, a single screw extruder, a twin screw extruder, and a single reciprocating screw kneader.

The polyolefin resin composition of the present invention thus prepared has excellent dimensional stability, surface smoothness, rigidity, hardness and the like of the polyolefin resin composition obtained by filling the polyolefin resin with a plate-like inorganic filler. It is possible to mold into a molded product having significantly improved impact strength while maintaining the characteristics or improving the rigidity and heat resistance.

The polyolefin resin composition having such excellent properties makes it possible to form molded articles such as bumpers, instrument panels, side moldings, radiator grills, cowl louvers, console boxes, meter hoods and various pillars in the automobile field. Can be suitably used for molding.

The polypropylene resin composition of the present invention has the excellent characteristics as described above, but if the rigidity, hardness, heat resistance, impact resistance and the like are further improved,
The resin composition of this invention is more preferable.

The resin composition of the present invention contains the specific polyolefin resin, the plate-like inorganic filler, the specific synthetic organic fiber and the acid-modified polyolefin resin which constitute the polyolefin resin composition of the present invention.

The acid-modified polyolefin resin is a resin obtained by modifying the polyolefin resin with an acid.

Examples of the polyolefin resin include low density polyethylene, medium density polyethylene, high density polyethylene, ultra high molecular weight polyethylene, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, polypropylene and the like. .

Among these, polyethylene, polypropylene and the like are preferable.

The molecular weight of the polyolefin serving as the main chain in the acid-modified polyolefin resin is usually 10 × 10 ^{4 to} 100.
× preferably 10 ^4, in particular 20 × 10 ⁴ to 80
It is preferably × 10 ⁴ .

Acids for modifying these polyolefin resins include maleic acid, maleic anhydride, acrylic acid,
And low molecular weight compounds containing a carboxylic acid group such as methacrylic acid, low molecular weight compounds containing a sulfo group such as sulfonic acid, and low molecular weight compounds containing a phospho group such as phosphonic acid. Among these, low molecular weight compounds containing a carboxylic acid group are preferred,
Maleic acid, maleic anhydride, acrylic acid, and methacrylic acid are particularly preferable.

As the acid used for modification, one of these may be selected and used, or two or more of them may be selected and used in combination.

The amount of acid added to the acid-modified polyolefin resin is usually 0.01 to 10% by weight, preferably 0.05 to 5% by weight, based on the acid-modified polyolefin resin.
Is.

The content of the acid-modified polyolefin resin in the resin composition of the present invention is 100 parts by weight in total of the specific polyolefin resin, the plate-like inorganic filler and the specific synthetic organic fiber in the polyolefin resin composition of the present invention. 0.01 to 10 parts by weight, preferably 0.
1 to 5 parts by weight.

When the content of the acid-modified polyolefin resin is within the above range, the molded product of the resin composition of the present invention is further improved in mechanical strength such as bending strength, hardness, heat distortion temperature and impact resistance. Can be improved.

The resin composition containing the acid-modified polyolefin resin of the present invention can be obtained by the same operation as that for preparing the polyolefin resin composition of the present invention, that is, the specific polyolefin resin and the plate-like resin. Kneading an inorganic filler, a specific synthetic organic fiber, and the acid-modified polyolefin resin at a temperature not higher than the melting point of the synthetic organic fiber, particularly at a temperature not lower than the melting point of the polyolefin resin and not higher than the melting point of the synthetic organic fiber. You can get it for the first time.

The kneading is the same as the kneading in the polyolefin resin composition.

Since the resin composition of the present invention is obtained by further improving the characteristics of the polyolefin resin composition of the present invention, the resin composition of the present invention can be used, for example, in bumpers for automobile parts, instrument panels, side moldings, It can be suitably used for molding molded products such as radiator grills, cowl louvers, console boxes, meter hoods, and various pillars.

[0063]

【Example】

(Examples 1 to 7, Reference Examples 1 to 4, Comparative Examples 1 to 9) Polyolefins, fillers and fibers of the types shown in Table 1 were dry-blended with the compounding amounts shown in Table 1, and then, with a biaxial kneader, After kneading at 180 ° C and sufficiently so as not to generate pills, the obtained pellets are heated to 80 ° C while
After drying for an hour, test pieces were prepared with an injection molding machine. The molding temperature was 180 ° C.

In Comparative Example 5 and Comparative Example 9, a temperature equal to or higher than the melting point of the synthetic organic fiber, that is, 280 ° C.
Kneading was done.

The prepared test piece was held at 23 ° C. for 48 hours and then subjected to various tests described below according to JIS. The test results are shown in Table 2.

Meaning of Symbols of Polyolefin Resin in Table 1 PP-1; Type: Crystalline ethylene-propylene copolymer Melt index: 30 g / 10 minutes, mmmm fraction in pentad fraction: 98.5%, melting point: 165 ° C PP-2 type: propylene homopolymer Melt index: 20 g / 10 minutes, mmmm fraction in pentad fraction: 98.0%, melting point: 166 ° C PE-1 type: high density polyethylene (HDPE) melt index : 6 g / 10 minutes, melting point: 137 ° C. MP-1 type: polymethylpentene-1 melt index: 26 g / 10 minutes, (tadashi, MI conditions: 260 ° C., 5,000 g) melting point: 240 ° C. type of filler talc- 1 type: talc Blaine Specific surface area: 32,000 cm / g talc Average particle size: 0.8 μ Mica-1 type: Mica Average particle size: 70 μm GB type: Glass beads Average particle size: 100 μm Fiber type Organic fiber-1 type; 66-Nylon fiber (melting point: 260 ° C.) Fiber diameter: 10 μm Fiber length: 3 mm Organic fiber -2 types; polyarylate fiber (melting point: 260 ° C.) fiber diameter: 25 μm fiber length: 3 mm organic fiber-3 types; polyethylene terephthalate fiber (melting point: 245
℃) Fiber diameter: 5 μm Fiber length: 6 mm Organic fiber-4 types; 66-Nylon fiber (melting point: 260 ° C.) Fiber diameter: 400 μm Fiber length: 100 mm Bending strength and bending elastic modulus; JIS K-7203 compliant Surface hardness; conforms to JIS K-7202 (scale:
R) Heat distortion temperature; conforms to JIS K-7207 (load: 4.
6 kg / cm ² ) Izod impact strength; conforms to JIS K-7110 (with notch) DuPont impact strength; conforms to JIS K-7221 Surface appearance; vertical, horizontal and thickness 140 mm, 140 mm
And a 3 mm flat plate were prepared, and the surface condition was visually observed and judged. As a result of the judgment, those in which the aggregate of the organic fibers having a size of 1 mm or more was not visually observed and the surface was not roughened were regarded as good, and the others were judged as defective.

[0067]

[Table 1]

[0068]

[Table 2]

The evaluation results of Examples 1 to 4 and Comparative Examples 1 to 5 in Table 2 above are significantly improved as compared with the evaluation results of Reference Example 1 in Table 3 below. ⊚, improved evaluation results are shown by ◯, equivalent evaluation results are shown by Δ, and conversely reduced evaluation results are shown by x. Further, the evaluation results of Examples 5 and 6 and Comparative Examples 6 to 8 shown in Table 2 above are significantly improved as compared with the evaluation results of Reference Example 2 in Table 3 below. ⊚, the improved evaluation result is shown by ◯, the equivalent evaluation result is shown by Δ, and the lowered evaluation result is shown by x. Similarly, Example 7 is referred to as Reference Example 3
Comparative Example 9 and Comparative Example 9 were evaluated in the same manner as in Reference Example 4 and shown in Table 4.

[0070]

[Table 3]

[0071]

[Table 4]

(Examples 8 and 9) Test pieces were prepared in the same manner as in Example 1 except that the amount of the acid-modified polyolefin resin shown in Table 5 in Example 1 was further added. Using this test piece, the same evaluation test as in Example 1 was performed. The evaluation results are shown in Table 6. Also,
The acid-modified polyolefin A in the table is polypropylene having a maleic acid addition amount of 5% by weight (molecular weight: 15 ×
10 ⁴ ), and the acid-modified polyolefin B is polypropylene (molecular weight: 20 ×) having an acrylic acid addition amount of 3% by weight.
10 ⁴ ).

[0073]

[Table 5]

[0074]

[Table 6]

[0075]

According to the present invention, it is possible to provide a polyolefin resin composition and a resin composition which are excellent in hardness, rigidity, impact resistance, heat resistance, appearance and dimensional stability. More specifically, according to the present invention, while maintaining the dimensional stability, surface stability, rigidity and hardness, which is an excellent feature of the polypropylene resin composition filled with a plate-like inorganic filler, or further rigidity, heat resistance And a polypropylene resin composition having a significantly improved impact strength. Further, it is possible to provide a resin composition in which the above excellent properties of the polypropylene resin composition of the present invention are further improved.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area C08L 23:26)

Claims (2)

[Claims] 1. A polyolefin resin having a melting point of 170 ° C. or lower, 40 to 95.5% by weight, and a plate-like inorganic filler, 4 to 40.
% By weight, melting point of 200 ° C. or higher, fiber diameter of 0.5
Polyolefin resin composition characterized by being kneaded with 0.5 to 20 wt% of synthetic organic fiber having a fiber length of 1 to 30 mm and a fiber length of 1 to 30 mm at a temperature not higher than the melting point of the synthetic organic fiber. . 2. A resin composition comprising 100 parts by weight of the entire components constituting the polyolefin resin composition according to claim 1 and 0.01 to 10 parts by weight of an acid-modified polyolefin resin.