JPS603414B2 - Talc-containing propylene polymer composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a high balance of physical properties (in particular, The present invention relates to a resin composition having good balance between impact strength and rigidity) and good molded product surface properties (particularly scratch resistance and appearance).

By blending inorganic fillers with thermoplastic resin, we improve its rigidity, heat resistance, combustibility, dimensional stability, flame retardancy, printability, paintability,
Improving various properties such as adhesion is widely practiced.

Although modification by this method is effective in terms of the above properties, it has low impact strength level and scratch resistance, and tends to cause silver streaks, flow marks, wrinkles, etc. on the molded product, and worsens the weld appearance. It has its drawbacks.

Regarding the methods of improving impact strength, methods for improving impact strength include methods using precipitated calcium carbonate of a specific particle size (Samurai Seki Sho 55-1120643 Publication), and blending specific heavy calcium carbonate with specific polypropylene. (Japanese Patent Publication No. 44-930), a method of adding a polymer having rubber-like properties to an inorganic filler-filled ethylene-propylene copolymer (Tsubaki Publication No. 53-64250, No. 53)
164257), a method for improving the compatibility between inorganic fillers and resins (Japanese Patent Laid-open No. 48-97947, 49-3)
No. 4937), etc. have been proposed.

In addition, to improve scratch resistance, a method of blending a specific organometallic compound with an inorganic filler into polyolefin (
JP-A No. 54-4325), a method of using glass fiber and mica in combination (JP-A-55-145715), a method of using a specific talc and a specific calcium carbonate in combination (JP-A-55-1) 120642) etc. have been proposed,
Although each of these exhibits some degree of effectiveness, they are not suitable for use in the field of industrial parts, which require a high level of surface properties such as a balance of physical properties between impact strength and rigidity, scratch resistance, and appearance. The quality is still inadequate.

On the other hand, among inorganic fillers, talc is widely used as a filler because it is easy to obtain, easy to handle, and has good dispersibility in resins. Improvement methods are proposed.

Among these proposals, a method for adjusting the particle size distribution of talc is noteworthy.

For example, a method using ultrafine-grained Yuruku as a filler (Japanese Unexamined Patent Publication No. 53-92850, No. 54-39453)
, a method of blending talc with a particle size of less than 10 French and an aspect ratio of 6 or more into polyvinyl chloride resin (Japanese Patent Application Laid-open No. 54-1
07948), a method of blending talc with an average particle diameter of 0.5 to 101 into polypropylene and a soft resin component (Japanese Patent Application Laid-open Nos. 53-64257 and 55-34271).

However, with some of these proposals, it is difficult to manufacture such talc because it is made of only ultrafine particles, and resin compositions containing it are also prone to molding defects and have poor impact resistance. It is also difficult to improve the receptivity and the prevention of appearance deterioration such as silver streaks, flow marks, grain marks, and deterioration of weld appearance.

In some cases, there is no limit to the proportion of talc present in the fine grain region (one peak or less), resulting in the occurrence of silver streaks, decreased fluidity (if there are too many fine grain regions), and decreased rigidity (if there are too many fine grain regions). No adjustment is made to prevent this.
Furthermore, other methods have been attempted in which a soft resin component (rubber component) is added as a third component, but this method is unsatisfactory, especially in terms of resistance to talc and appearance, due to insufficient consideration of the particle size distribution of talc. It has drawbacks such as being unable to find a balance in quality such as insufficient rigidity. The present invention is an attempt to solve these drawbacks of the prior art, and as a result of focusing on the particle size distribution of talc and its influence on the quality of the propylene-based polymer matrix, we found that talc with a specific particle size distribution is By blending the polymer resin with an ethylene polymer of a specific density and a specific rubber-like component, a high degree of physical property balance (especially the balance between rigidity and impact strength 1) and good molded product surface properties (especially scratch resistance and appearance) can be achieved. The present invention was achieved by discovering that a resin composition having the following properties can be obtained.

That is, the present invention consists of the following components [a} to td}, and the blending ratio of {a-, {b- and [c}] is {
50-9% by weight, 4-25% by weight and 4-25% by weight relative to a}+(b}+-(c}', respectively, and the blending ratio of 'a-10'b) )+{c}10{A talc-containing propylene polymer composition characterized in that it is 5 to 5% by weight based on the skin.'a} Crystalline propylene polymer'bl Density 0.930/ Ethylene polymer with [
c} At least one rubbery component selected from styrene-butadiene rubber, styrene-phthalene flock copolymer, and ethylene-propylene rubber; and particles having a specific surface area of 30,000 or more 95% by weight or more of dimensions 10 or less, 85% or more of dimensions 5 or less, 1
Talc with a content of 15 to 95% by weight (however, the above specific surface area means the value measured by the air permeation method, and the particle size means the value measured by the light transmission method using the liquid phase sedimentation method).

) Since the composition of the present invention is excellent in the above points, it enables the resin to be applied to the field of industrial parts such as home appliance parts and automobile parts, which require a high level of quality balance.

Next, each component used in the present invention will be explained in detail. The crystalline propylene polymer used in the present invention may be a propylene homopolymer (polypropylene), or may be a propylene homopolymer (polypropylene), or propylene and other Q-olefins (e.g., ethylene, butene, bentene, hexene, heptene, etc.) or unsaturated organic acids or their like. So-called vinyl monomers such as anhydrides (for example, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, etc.) or unsaturated esters (for example, vinyl acetate, ethyl acrylate, methyl methacrylate, etc.), vinyl silanes, or aromatic vinyl compounds. - may be a block, random or graft copolymer of two or more elements. Furthermore, a mixture of these polymers may also be used. In the case of the above copolymer of propylene and other vinyl monomers, propylene must account for at least a majority by weight.

Such a propylene polymer must be crystalline, and its isotactic index (11) is generally 40 or more, preferably 60 or more.

Those with 11 less than 40 are unsuitable due to insufficient rigidity, hardness, etc.

In addition, the MFR (JIS-K
7210, 230oo, 2.16kg load) is 0.01
~150 evenings/10 minutes, particularly preferably 0.1~8 meters/10 minutes.

If the MFR is less than 0.019/10 minutes, the moldability and appearance are not good, and if it is more than 150 minutes/10 minutes, the impact resistance is poor and unsuitable.

Among such crystalline propylene polymers, polypropylene, crystalline propylene-ethylene block or random copolymers are preferred.

In the case of this propylene-ethylene copolymer, one having an ethylene content of 1 to 25% by weight is particularly preferred. Here, the measured value of ethylene content is obtained by a conventional method using infrared spectrum analysis and NM eaves. The preferred reason is polyps. Particularly favorable results can be obtained with pyrene in terms of rigidity, object resistance, appearance, and weld strength, and particularly favorable results with propylene-ethylene copolymer in terms of impact resistance, scratch resistance, and appearance. Next, the ethylene polymer used in the present invention has a density of 0.930 m/m or more, and types include ethylene homopolymer (polyethylene), ethylene and other Q-olefins (e.g. propylene, , bentene, hexene, heptene, etc.) or unsaturated organic acids and their anhydrides (e.g., acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, etc.)
Alternatively, binary or more block, random or graft copolymers with unsaturated esters (for example, vinyl acetate, methyl acrylate, methyl methacrylate, etc.), vinyl monomers such as vinyl silane or aromatic vinyl compounds, etc. can be mentioned. . Furthermore, a mixture of these polymers may also be used. In the case of the above copolymer of ethylene and other vinyl monomers, ethylene must account for at least a majority by weight.

MFR of these ethylene polymers (JIS-K7210
, 190oo, 2.16k9 load) is 0.01 to 100
Evening/10 minutes, particularly preferably 0.1 to 30 evening/10 minutes.

Also, among these ethylene polymers, the density is 0.930
~0.965 ta' ground is preferable, 0.930 ta'
If it is less than , it is unfavorable in terms of rigidity and weld strength.

Among these ethylene polymers, polyethylene is particularly preferred.

Such ethylene polymers are effective in improving impact resistance, but it is difficult to improve the drawbacks of poor resistance to objects and poor appearance due to chipping, which were noticeable in conventional talc-containing olefin polymer compositions. also shows particularly remarkable effects.

However, this effect is achieved while maintaining a suitable balance of physical properties, particularly rigidity and impact strength, at a good level, and was achieved for the first time in the present invention. Next, the rubbery components used in the present invention include styrene-butadiene rubber (hereinafter referred to as SBR), styrene-butadiene flock copolymer (hereinafter referred to as SBB), ethylene-propylene rubber (hereinafter referred to as E
It is at least one type selected from the following.

Although the properties of these rubbery components are not limited,
SBR is based on JIS-K6300 (Mooney viscosity ML)
14 (100oo) 20-80 is preferable, and 35-60 is particularly good.

At the same time, the bound styrene content (weight) is preferably 15 to 60%, particularly 20 to 50%. Also, S
BB is a copolymer composed of a conjugated diolefin and an aromatic vinyl compound and whose general formula is represented by the following formula.

(A-B) Elbow, or B-(A-B) M, or A-(
B-A)n where A is a polymer block made of an aromatic vinyl compound, B is a conjugated diolefin polymer block, n
' is an integer from 1 to 20, and the proportion of the A block to the entire molecule is 1 to 5% by weight. The average molecular weight of this copolymer is 10,000 to 1,000,000, preferably 5,000.
It is 0 to 250,000. As a conjugated diolefin,
1,3-butadiene, isobrene, n-1,3 pentadiene, etc. are used. Further, as the aromatic vinyl compound, styrene, methylstyrene, dimethylstyrene, etc. are used. Note that the effects of the present invention are also exhibited with respect to a styrene-butadiene block copolymer obtained by hydrogenating a conjugated diolefin polymer block. In addition, EPR is ethylene-propylene copolymer rubber (EPM) or ethylene-propylene-nonconjugated terpolymer rubber (EPD).
M), where the amount of propylene (weight) is 25 to 60%
, preferably 20-45%, Mooney viscosity ML+4(1
00qo) is 20 to 120, preferably 60 to 110,
Furthermore, it is appropriate for EPDM to have an iodine value of 20 or less.

Two or more of these rubbery components may be used in combination.

On the other hand, the talc used in the present invention has a specific surface area of 30,000
95% by weight of particles with a particle size of /ta or more and a particle size of 10 # or less
As mentioned above, the particle size distribution is such that 85% by weight or more is 51 or less, and 15 to 95% by weight is 1# or less.

Among these, those having a specific surface area of 38,000 cm or more are preferred. Regarding the preferred particle size or particle size distribution, it is preferable that the upper limit of the particle size is substantially 15 μm or less, and particularly preferably, the particle size is substantially 15 μm or less, and 97% by weight or more is 10 μm or less, and 5 μm or less The following is 80% by weight or more, and the content of one peak or less is 15 to 95% by weight. Particle size 10
In the case of talc containing 95% by weight of less than 50% by weight and less than 85% by weight of less than 5%, the crystalline propylene polymer used in the present invention,
A composition in which an ethylene polymer and a rubber-like component are filled with the same has poor impact resistance and scratch resistance, and is therefore undesirable. Also,
If the particle size is 15% by weight or less, the rigidity and scratch resistance of the composition will be poor, while if the particle size is more than 95% by weight, silver streaks will easily occur during molding of the composition. , the fluidity is also poor and unfavorable. Here, the measurement of the specific surface area is based on the so-called air permeation method, which is a conventional method.
The measurement is carried out using a value pressure aeration type specific surface area measuring device, for example, a powder specific surface area measuring device SS-10 top type manufactured by Shimadzu Corporation.

Further, the particle size distribution is measured by an integrated weight distribution value by a light transmission method using a liquid phase sedimentation method.

The measuring device is, for example, a CP type (for example, CP-50) manufactured by Shimadzu Corporation or an SKN type (for example, SRN-1000 type) manufactured by Seishin Enterprises. Although it is common for differences in measurement values to occur due to differences in equipment, the values for the CP type mentioned above are lower than those for the SKN type (weight%), especially for talc with a particle size of 5 or less. ), and the present invention is more applicable to the CP type.

The particle size distribution of talc dispersed in the resin can be determined by boiling point extraction of this composition with an organic solvent (for example, by dissolving it in xylene at 130 to 140 qO for about 1 hour,
It can be determined by measuring the particle size distribution of talc taken out by passing it through a cylindrical furnace paper to separate talc and resin, or by firing the composition, or by measuring the particle size distribution using the method described above.

In addition, the average value of the aspect ratio, which indicates the ratio of either the vertical or horizontal length and thickness of this talc, is preferably 3 or more,
Especially 4 or more is good.

In addition, the average particle size of this talc (CP manufactured by Shimadzu Corporation mentioned above)
The particle size value at the 50% point on the cumulative distribution curve of particle size measured with a mold or SKN type device manufactured by Seishin Enterprises) is 0.2 ~
3.0 is preferable.

If it is less than 0.2 μm, the appearance, especially silver streaks, is likely to occur, and if it is more than 3.0 μm, it is unfavorable in terms of scratch resistance.

Talc with an average particle size of 1.5 mm or less is easily obtained by wet classification, and talc with an average particle size of 0.7 mm or more is easily obtained by dry classification. Such talc is produced, for example, by the following classification method.

That is, talc raw stone is crushed using equipment such as a tube mill type crusher, an impact type crusher, a micron mill type crusher, a centrifugal roller type Raymond mill, etc., and if fine crushing is required, a micron mill, a jet type crusher, Jet O.
Dry or wet pulverization is performed using a miser, a micronizer, a jet/f iberizer, a Takaazusa mill (tower mill), a vibration mill, a colloid mill, or the like. Next, these crushed talcs are passed through a cyclone, multilon, micron separator, microplex, cyclone air separator, etc.
Glitter, Ultra separator/glator, Jettoclone, Classiclon, Rake classifier, Hydrocyclone,
Dry or wet classification is performed once or multiple times using a device such as a hydraulic classifier or a centrifugal classifier to adjust the distribution. Among these, hydrocyclone, hydraulic classifier, micron mill, and miku.

Good results are often obtained by using devices such as cyclone separators and cyclones. Note that this talc may or may not be surface-treated.

Examples of surface treatments include silane coupling agents,
Chemical or physical surface treatment with various treatment agents such as higher fatty acids, fatty acid metal salts, unsaturated organic acids or their derivatives (maleic anhydride, acrylic acid, etc.), organic titanates, resin acids, etc. can be mentioned.

In addition to the effects of the present invention, surface treatment is effective in improving weld strength, paintability, adhesion, tapping performance, moldability, mud kneadability, and the like.

The blending ratio of these four components used in the present invention is {a} for the crystalline propylene polymer, (b} for the ethylene polymer with a density of 0.9309' or higher, and 'c-' and talc for the rubbery component. Let 'd} be 'a}, (b} and '
c}, {a): 50 to 92% by weight, preferably 56 to 84% for {a} ten {b} ten {c}, respectively.
Weight %'b-: 25-4% by weight, preferably 22-8% by weight {c): 25-4% by weight, preferably 22-8% by weight; [c}ten {d
5 to 5% by weight, preferably 5 to 4% by weight.

If the {a} component is less than 5% by weight, the rigidity, appearance, and moldability will be poor, and if it exceeds 9a% by weight, the impact resistance will be poor. (b} If the content of the component is less than 4% by weight, the impact resistance, acceptance resistance, and appearance will be poor, and if it exceeds 25% by weight, the rigidity will be poor.

[C--If the content of component is 4% by weight, the impact resistance, scratch resistance, and appearance will be poor, and if it exceeds 25% by weight, the rigidity will be insufficient.

{d} If the content of the component is less than 5% by weight, the rigidity will be insufficient, and sink marks and deformation of the molded product will become noticeable.If the content exceeds 5% by weight, the impact resistance, object resistance, and appearance will deteriorate. Insufficient filling during molding is likely to occur.

In addition to the above-mentioned components, the composition of the present invention may contain other additional components as long as the effects of the present invention are not significantly impaired. Their additional ingredients include inorganic or organic fillers other than talc, with or without surface treatment, such as calcium carbonate (heavy, light, pork, etc.);
Mica, glass fiber, barium sulfate, poppy, calcium acid, clay, magnesium carbonate, alumina, silica, iron oxide, calcium sulfate, glass beads, glass powder, white carbon, hollow glass bulb, poppy, sand, poppy, stone,
Carbon black, aluminum hydroxide, magnesium hydroxide, zinc oxide, basic magnesium carbonate, asbestos, zeolite, white oxide, molybdenum, titanium oxide, diatomite, sericite, shirasu, graphite, calcium hydroxide, calcium sulfite, gypsum fiber , carbon fiber, synthetic silicate fiber (PMF: processed mineral fiber), quartz powder, bentonite, metal whiskers, wood powder,
rubber or latex components other than those used in the present invention (e.g. polybutadiene, polysobrene,
1,2-polybutadiene, butyl rubber, nitrile-butadiene rubber, polyisobutylene, etc.), thermoplastic resins or thermosetting resins other than the above resin components used in the present invention (e.g., high, medium or low density polyethylene, polybutene, etc.) Olefin polymer resins such as homopolymers of Q-olefins, copolymers of Q-olefins, copolymers of Q-olefins and vinyl monomers, as well as nylon, polycarbonate, acrylonitrile-butagene-styrene resins (ABS), polystyrene, polyvinyl chloride,
Resins other than olefin polymer resins such as polyphenylene oxide, petroleum resins, and phenolic resins), antioxidants (
(phenol-based, sulfur-based, etc.), lubricants, various organic and inorganic pigments, ultraviolet absorbers, antistatic agents, dispersants, copper damage inhibitors, neutralizing agents, blowing agents, plasticizers, anti-foaming agents, key fuel agents , crosslinking agents, flowability improvers (for example, various peroxides), weld strength improvers (for example, various peroxides), nucleating agents, and the like.

The addition of these various resins and auxiliaries affects not only the physical property balance and molded product surface properties (resistance, gloss, weld appearance, silver streaks, flow marks, etc.), but also printability, paintability, adhesion, and plating properties. It is effective in improving tapping properties, molding processability, kneading properties, weld strength, durability, heat resistance, weather resistance, etc. These additional components can also be added in combination. The addition of an inorganic filler as an additional component not only contributes to the effects of the present invention, but also improves plating properties, paintability, adhesion, gloss, moldability, tapping properties, kneading properties, weld strength, creep resistance, and dimensions. Effective for improving stability, heat resistance, etc.

Note that the addition of finely divided calcium carbonate (pork quality, child quality), barium sulfate, titanium oxide, and zinc oxide with an average particle diameter of about 0.05 to 1 F has a remarkable improvement in these effects. In particular, the specific surface area is 16,000/ta or more and the average particle size is 0.16
Adding 5 to 70 parts by weight of wet-ground heavy calcium carbonate, which does not have a settling quality of ~1.0 French, per 10 parts by weight of the above components 'a} to {d) improves the physical property balance and surface properties. and dramatically improve secondary processability, especially paintability. The composition of the present invention can be produced using a single screw extruder, a twin screw extruder,
It can be manufactured using a conventional kneading machine such as a Bumperley mixer, roll, Brabender Plastograph, or kneader.

Usually, it is made into a pellet-like compound by thickening with an extruder etc.
After straining, it is subjected to processing, but in special cases, the talc, propylene polymer, ethylene polymer, and rubbery component can be directly fed to various molding machines and molded while being kneaded in the molding machine. Alternatively, talc is kneaded in advance to a high concentration (with various additives as necessary) to form a masterbatch, which is then separately diluted with a propylene polymer or the like or a talc-containing propylene polymer for blend compounding.
It can also be molded. The method of molding the composition of the present invention is not particularly limited, but extrusion molding and various thermoforming methods are suitable for compositions with a relatively low MFR, and injection molding is suitable for compositions with a relatively high MFR.

That is, the effects of the present invention are exhibited in molded products regardless of the molding method used, such as extrusion molding, blow molding, injection molding, sheet molding, aged molding, rotational molding, and lamination molding. The composition of the present invention thus obtained has a high balance of physical properties (impact strength-rigidity) and good surface properties of molded products (scratch resistance, appearance), which are not found in conventional talc-containing propylene polymer compositions. In addition, it has good heat deformation resistance, moldability, printability, paintability, plating performance, tapping performance, and creep resistance, with no noticeable sink marks or warpage, and no noticeable weld lines.
EXAMPLES The present invention will be explained in more detail with reference to Examples below.

The various measurement methods used here are as follows. ■ Impact strength ■ Surface impact strength (Dupont impact strength) Using a sheet of 35 sides x 5 sides x 2 ribs, JIS-K54
Using the equipment shown in 00-6-13 Quality 2, Method B (reference test), the diameter of the curvature of the dart and receiving plate was 1'2.
The experiment was conducted under the condition of inches, and the impact strength value was defined as the fall energy at 50% failure (measurement temperature 23qo)
.

■ Bending impact strength (Notched Izod impact strength) JI
Compliant with S-K7110 (measured temperature 2300) ■ Rigidity (
Three-point bending elastic modulus) Based on JIS-K7203 (measurement temperature 2yo).

■ Object resistance We improved the pencil scratch test device specified in JIS-K5401, set a 100 yen coin in the pencil set part, and applied a load of 2500 yen to the uneven side surface of the coin for 3 minutes.
A test piece of 5 ribs x 50 ribs x 2 ribs with a coarse grain (average height of the convex portions 0.1 ribs, average surface bond of the convex portions 4 grains) was rubbed on the sheet, and the marks were visually judged as follows. (measured temperature 2)
.

Visual inspection results: No scratch marks are observed. Almost no grade 1 scratch marks are observed. Some grade 2 scratch marks are observed. Grade 3 scratch marks are observed.
Grade 4 ■ Silver streaks, flow marks, grain marks, etc. on the coarsely grained sheet used before appearance (
Visually observe the occurrence of defects (hereinafter referred to as defects) and weld lines.

Visual inspection results: No defects were observed at all, and the weld lines were hardly noticeable, making them very good. Almost no grade 1 defects were observed, and the welt lines were hardly noticeable, making them good.
Some grade 2 defects are observed, weld lines are also noticeable, and it is poor. Grade 3 defects are observed, weld lines are noticeable, and it is extremely poor.
Grade 4 Example I Talc produced in China was sufficiently ground in a micron mill, and further classified using a micron separator.

After that, dry precision classification was performed using a cyclone, and No. 1 in Table 1 was obtained. 1 and no. Talc having the specific surface area and particle size distribution shown in 2 was obtained. The average particle diameter and average aspect ratio of this talc were measured and found to be 1.4 degrees, 2.3 degrees, and 6.5, respectively.

Moreover, coarse particles of 15A or more were not observed in the former, but were observed in the latter at 0.1% by weight.

Further, after pulverization with a micron mill, wet pulverization was performed with a colloid mill, and then wet precision classification was performed using a hydrocyclone. Talc having a specific surface area and particle size distribution shown in 10 was obtained. The average particle size of this talc was 0.6 grains, and the average aspect ratio was 7. In addition, 15
No coarser particles than Buddha were observed. These talc and EPM as a rubber component (EP07P sold by Mitsubishi Yuka Co., Ltd.)
: Propylene amount 2% by weight, Mooney viscosity ML14 (
100qC) 75), EPDM (Mitsubishi Yuka Co., Ltd. sales EP2
7: Propylene content 43% by weight, Mooney viscosity ML...(
100°C) 4-iodine value 15), SBB (Califlex TRII02 manufactured by Shell Chemical Co., Ltd.: A-(B
-A), styrene-1,3-butadiene flock copolymer having the structure of
02: Mooney viscosity ML, 14 (10 pi 0) 52, bound styrene content. 5%) and polyethylene with a density of 0.950 mm/base as an ethylene polymer (EY made by Mitsubishi Yuka Co., Ltd.)
40:MFRO. 8 tano 10 minutes) or density 0.935
9/ Carp polyethylene (prototype: MFR2 evening/10 minutes)
Each pellet and polypropylene as a propylene polymer (manufactured by Mitsubishi Yuka Co., Ltd. MH4: MFR5 evening/10 minutes, 119
8), Propylene-ethylene block copolymer A (prototype: polyethylene content 3% by weight, MFR20 evening/10 minutes, 1
194), B (prototype: engineered ethylene content 11% by weight, M
“RI. 3 evenings/10 minutes, 1197) or propylene-ethylene random copolymer (prototype: ethylene content 2% by weight, MFR 9 evenings/10 minutes, 1168) using each pellet, the prescribed conditions shown in Table 1 were used. A mixture consisting of pengala as pigment and carbon black 5:1 in the ratio of (
The mixture was mixed for 2 minutes with a super mixer manufactured by Kawada Manufacturing Co., Ltd., and kneaded and granulated (23000) using a PCM type twin screw extruder manufactured by Ikegai Iron Works Co., Ltd. to obtain a pellet-like compound. After that, a test piece was molded (230 oo) using a screw-in line injection molding machine manufactured by Meiki Seisakusho.
Its impact strength, rigidity, resistance to susceptibility, and appearance were evaluated. The results are shown in Table 1 No. 1 to 14.

All showed a good quality balance. Tei ripple island omitted ship ■ .

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Kasumifune Kobiya* Comparative Example 1 Partial changes or omissions to the processes and conditions of the crusher and classifier used in Example 1 to produce talc (reduced rotational speed of micron separator, omitted cyclone classification, Cyclone rotation speed increased) and Table 2 No. 22, NO. 2-in NO.
Talc having the specific surface area and particle size distribution shown in No. 24 was obtained.

The average particle size and average aspect ratio of this talc are 3.9〃, 8.5A, 0.16A, and 5, 4, and 7, respectively, and the coarse particles of 15R or more are 7 and 250% by weight, respectively. Ta. This talc or Example INo. In addition to the talc used in Example 1, the same EPM, polyethylene EY40, polypropylene MH4, and pigment used in Example 1, polyethylene with a density of 0.924 ta Example 1
Mixing, kneading, adjustment and evaluation were carried out using the same method as above. Second result
Table No. 15-25. All had poor quality balance. In other words, if conventional talc with a large phase particle content or with a non-specific distribution is used, the impact strength will be at a low level, and the resistance and appearance will be extremely poor, and if the fine particle content is large, silver streaks will occur. , physical properties deteriorate due to secondary aggregation. Furthermore, if the rubber component is not used or if it is used in too little, the impact strength is extremely low, and the latter in particular deteriorates the appearance (flow marks). Furthermore, if there is too much of the rubbery component, the rigidity will decrease and the object resistance and appearance will deteriorate. If the ethylene polymer is not used, or if it is used in an insufficient amount, the impact strength is at a low level, the image reception resistance in particular is significantly deteriorated, and wrinkles occur.

Furthermore, when a so-called low-density ethylene polymer having a density of less than 0.930 mm is used, the rigidity is reduced, as well as the scratch resistance and appearance, and the weld strength is poor. If both the rubbery component and the ethylene polymer are used together, the impact strength will be extremely reduced and the appearance will also deteriorate. Kokonfunenfunabedokotsu [giin].

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Model molded flat plates (with coarse graining) were molded for large automobile parts such as trim, home appliance parts such as air conditioners and televisions, etc.

Claims (1)

[Claims] 1 Consisting of each of the following components (a) to (d), (a),
The blending ratio of (b) and (c) is (a) + (b) + (
They are respectively 50-92% by weight, 25-4% by weight and 25-4% by weight with respect to c), and the blending ratio of (d) is (
5 to 50% by weight based on a) + (b) + (c) + (d)
A talc-containing propylene polymer composition. (a) Crystalline propylene polymer (b) Ethylene polymer with a density of 0.930 g/cm^3 or more (c) Styrene-butadiene rubber, styrene-
At least one rubber component selected from butadiene block copolymer and ethylene-propylene rubber (d
) Talc (
However, the above specific surface area means a value measured by an air permeation method, and the particle size means a value measured by a liquid phase sedimentation type light transmission method. ).