JPS5943057B2 - Inorganic filler-containing resin composition - Google Patents

Description

Detailed Description of the Invention The present invention can be obtained by blending talc with a specified specific surface area and particle size distribution and calcium carbonate with a specified specific surface area and average particle size into a crystalline propylene polymer resin. The present invention relates to a resin composition that has a high balance of physical properties (especially a balance between rigidity and impact resistance) and good surface properties of molded products (especially surface scratch resistance and appearance).

Inorganic fillers are blended into thermoplastic resins to improve their properties such as rigidity, heat resistance, flammability, dimensional stability, flame retardance, creep resistance, surface gloss, printability, paintability, and adhesion. This is widely practiced.

Although this method of modification is effective in terms of the above-mentioned properties, it has the disadvantages of low impact strength and surface scratch resistance, and the tendency for silver streaks, flow marks, grain marks, etc. to occur on molded products. have. Regarding methods for improving impact strength, methods for improving impact strength include methods using precipitated calcium carbonate of a specific particle size (Japanese Patent Application Laid-Open No. 120643/1982), and blending specific heavy calcium carbonate with specific polypropylene. (Japanese Patent Publication No. 44-930), a method of adding a polymer having rubbery properties to an inorganic filler-filled ethylene-propylene copolymer (Japanese Patent Publications No. 53-64256, 53-64)
257), a method for improving the compatibility between an inorganic filler and a resin (JP-A-48-197947, JP-A No. 49-3493)
Publication No. 7) etc. have been proposed.

Regarding improvement of surface scratch resistance, methods include a method of blending a specific organometallic compound with an inorganic filler into polyolefin (Japanese Unexamined Patent Publication No. 54-43250), a method of using glass fibers and mica in combination (Japanese Unexamined Patent Publication No. 54-43250), Publication No. 45715),
How to use certain talc and certain calcium carbonate together (
JP-A-55-120642), etc. have been proposed, and although each of these has shown some degree of effectiveness, the physical property balance between surface impact strength and rigidity, surface damage resistance,
The quality is still insufficient for use in the field of industrial parts, which requires high levels of surface properties such as silver streaks, flow marks, and anti-wrinkle properties.

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. A method of quality improvement has been proposed.

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

For example, a method using ultrafine talc as a filler (JP-A-53-92856, JP-A-54-39453) involves blending talc with a particle size of less than 10 μm and an aspect ratio of 6 or more into a polyvinyl chloride resin. Method (Unexamined Japanese Patent Publication 1973-
107948), a method of blending talc with an average particle size of 0.5 to 10μ into polypropylene and a soft resin component (JP-A-53-64257 and JP-A-55-3427)
Publication No. 1), etc.

However, in some of these proposals, it is difficult to manufacture such talc because the talc is only ultrafine particles, and the resin composition containing it is also prone to molding defects and has poor surface scratch resistance. It is also difficult to improve silver streak prevention properties.

In some cases, there is no limit to the proportion of talc present in the fine grain region (1μ 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 few fine grain regions). No adjustments are made to prevent this.
Furthermore, other products have drawbacks such as the addition of a soft resin component as a third component, which reduces the rigidity and makes it impossible to maintain quality balance. In order to eliminate this drawback,
A method of blending talc with a more uniform particle size distribution into propylene-ethylene copolymer resin was proposed (Japanese Patent Application Laid-Open No. 1983-1999).
Publication No. 8235).

The present invention takes this proposal one step further, and in particular improves the surface scratch resistance to a higher degree, and also solves the above-mentioned drawbacks of the conventional technology. Effects of specific surface area and average particle size of calcium and various qualities of crystalline propylene polymer resin matrices on various qualities of crystalline propylene polymer resin matrix By blending talc with a certain particle size distribution and calcium carbonate with a specific specific surface area and average particle size into crystalline propylene polymer resin, a high degree of physical property balance (especially a balance between rigidity and impact resistance) and good molded products can be achieved. The present invention was achieved by discovering that a resin composition having surface properties (particularly surface scratch resistance and appearance) can be obtained. That is, the present invention provides the following (a) to (c)
consists of each component, and (b) + (c) is (a) + (b) +
This is a resin composition containing an inorganic filler in an amount of 10 to 70% by weight based on (c).

(However, the above specific surface area means the value measured by the air permeation method, and the particle size and average particle diameter mean the values measured by the light transmission method using the liquid phase sedimentation method.

) In addition to being excellent in the above points, the composition of the present invention also has good moldability, heat resistance, secondary processability (paintability, printability, adhesiveness, plating property, hot stamping property, sputtering property, etc.), etc. Therefore, the resin can be applied to the field of industrial parts such as home appliance parts and automobile parts, which require a high level of overall quality balance, and especially to the field of large automobile interior parts such as instrument panels.

Next, each component used in the present invention will be explained.

The crystalline propylene polymer resin used in the present invention, which is the component (a), is a stereoregular propylene homopolymer (polypropylene), an α-olefin other than propylene, such as ethylene, butene-1, benzene-1, etc. 1
, hexene-1, heptene-1, octene-1, etc. (preferably α-olefin having 8 or less carbon atoms, especially ethylene and butene-1 are particularly preferred) propylene containing 40% by weight or less, preferably 30% by weight or less and these α−
Binary or random copolymers with olefins, these polypropylene and propylene-α-olefin copolymers with unsaturated organic acids or derivatives thereof (e.g. acrylic acid, methacrylic acid or their esters,
(maleic anhydride, etc.) or organic silanes (e.g., vinyltrimethoxysilane, etc.), or those treated with chlorination, oxidation, sulfonation, etc.; The index (11) is 40 or more. It is preferable that 11 is 60 or more, especially 1175 or more.

If 11 is less than 40, the rigidity and hardness are insufficient.

Among these, propylene-ethylene random or block copolymers, propylene-ethylene-butene-1
Preference is given to copolymers, especially propylene-ethylene block copolymers with an ethylene content of 1 to 30% by weight, and even 3 to 25% by weight (as the ethylene content in the propylene-ethylene copolymers increases, especially DuPont impact The degree of improvement in surface impact strength such as strength is significant.The ethylene content is measured by conventional methods such as infrared spectrum analysis and NMR). In addition, in order to improve fluidity during molding, these crystalline propylene polymer resins have a melt flow rate (MF
R) is generally about 0.01 to 1009/10 minutes, preferably 0.3 to 809/10 minutes.

If the MFR is less than 0.019/10 minutes, molding defects tend to occur, resulting in poor molded appearance. Also, 1009/1
If the time exceeds 0 minutes, the impact strength is insufficient. Here MFR
was measured in accordance with JIS-K721O (2300C, 2.16k9 load). Note that these crystalline propylene polymer resins may be used together in any proportion.

These polymers are polymerized using a Ziegler-Natsuta catalyst, and can be appropriately selected from commercially available polymers. Next, the talc which is the component (b) used in the present invention has a specific surface area of 30,000-/9 or more, preferably 38,000 cd/9 or more, and 95% by weight or more of talc with a particle size of 10 μ or less. , the particle size distribution is 85% by weight or more of particles with a diameter of 5μ or less, and 15 to 60% by weight of particles with a diameter of 1μ or less.

Among these, those having a particle size of substantially 15μ or less are preferable from the viewpoint of impact resistance and surface damage resistance of the composition of the present invention, and particularly preferably particles having a particle size of substantially 15μ or less and 10μ or less is 97% by weight or more, 87% by weight or more is 5μ or less, and 15 to 45% by weight is 1μ or less. Particle size 10μ
If the particle size of talc is less than 95% by weight or less than 85% by weight, the composition will have poor impact resistance and surface scratch resistance. If the particle size is less than 1μ or less than 15% by weight, the composition will Rigidity and surface damage resistance are poor, and if the proportion of 1 μm or less exceeds 60% by weight, silver streeters are likely to occur during molding of the composition, and fluidity is also poor, which is undesirable.

The specific surface area is measured by the generally widely used air permeation method using a so-called constant-pressure aeration type specific surface area measuring device, such as the powder specific surface area measuring device S manufactured by Shimadzu Corporation.
This is carried out using a model S-100 or the like.

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

Examples of the measuring device include the CP type (for example, CP-50) manufactured by Shimadzu Corporation and the SKN type (for example, SKN-1000 type) manufactured by Seishin Corporation. Although it is common for differences in measurement values to occur due to differences in equipment, the values for the CP type mentioned above have a lower distribution value (wt%) than the value for the SKN type, especially for talc with a particle size of 5μ or less. According to the present invention, the CP type is more accurate.

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, immersing and dissolving it in xylene at 130 to 140°C for about 10 hours, and passing it through a cylindrical paper). It can be determined by measuring the particle size distribution of talc taken out by a method in which talc and resin are separated from each other or by a method in which the composition is fired. In addition, the average particle size of the talc is 0.7 to 3,
0μ is preferred. The measuring method at this time uses the value at the 50% point of the particle size distribution integrated weight distribution curve described above. Such talc is produced, for example, by the following classification method.
That is, talc raw stone is crushed with 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 dinit type crusher, Jinit O.
Finely pulverize with a mixer, a micronizer, a jet pulverizer, etc. Next, these pulverized talcs are classified once or multiple times using equipment such as Cytalon, Multilon, Micron Separator, Microflex, Cyclone Air Separator, Ultra Separator, Ginitkron, and Clacyclon, and the distribution is adjusted. .

Among these, good results are often obtained using devices such as micron mills, micron separators, and cyclones.

Among talcs that have been adjusted to have an appropriate particle size distribution by such a method, those with an average aspect ratio of 3 or more, which indicates the ratio of either vertical or horizontal length to thickness, are preferred, particularly 4.
The above is good.

Note that this talc may or may not be surface-treated.

Examples of surface treatments include silane coupling systems, higher fatty acid systems, fatty acid metal salt systems, unsaturated organic acids or their derivatives (maleic anhydride systems, acrylic acid systems, etc.), organic titanate systems, resin acid systems, etc. Mention may be made of chemical or physical surface treatment with treatment agents.

Among these, treatments with higher fatty acids, fatty acid metal salts, and resin acids are preferred.

The amount of surface treatment agent is 0.01 to 8% by weight based on talc.
It can be set according to the purpose within the range of .

In addition to the effects of the present invention, surface treatment is effective in improving coating properties, adhesion properties, tapping properties, moldability, kneading properties, etc.

Furthermore, calcium carbonate, which is the component (c) used in the present invention, has a specific surface area of 16.000? /9 or more, and the average particle size is 0.16 to 1.0 μm, which is sedimentary colloidal or wet-pulverized heavy fine calcium carbonate.

If the specific surface area is less than 16,000 d/9, the impact resistance and appearance of the composition will be poor.

In addition, if the average particle size is less than 0.16 μm, the production is inefficient, and the impact resistance and appearance of the composition are deteriorated, making it undesirable. On the other hand, if the average particle size exceeds 1.0 μm, the composition The rigidity of the molded product decreases, and the surface properties of the molded product also deteriorate. Note that the effects of the present invention are not achieved even with conventional dry-ground heavy calcium carbonate. These calcium carbonates are obtained by pulverizing precipitated colloidal calcium carbonate or heavy calcium carbonate produced by chemical methods using a wet pulverization method.

As a method for producing precipitated colloidal calcium carbonate suitable for the present invention, for example, in the process of obtaining precipitated calcium carbonate by introducing carbon dioxide gas into a slurry of slaked lime suspended in water and causing a reaction, initially 0.01 to After producing calcium carbonate with a wide particle size range of 2μ, we incorporated the idea of leaving it for several days with gentle stirring at a temperature of around 50℃, thereby obtaining calcium carbonate with a special average particle size. can be mentioned.

In addition, as a method for pulverizing heavy calcium carbonate in a manner suitable for the present invention by a wet pulverization method, for example, raw ore or powder of heavy calcium carbonate can be crushed using a stirring mill (tower mill), a vibration mill, a colloid mill, etc. There is a method of grinding using a wet grinder.

In this case, wet pulverization may be performed after preliminary pulverization using a dry pulverizer such as a super micron mill, and classification of the pulverized product may or may not be carried out.
In this case, a dry wind classifier such as a cyclone classifier or a wet type classifier such as a hydrocyclone or hydraulic classifier may be used. Among those suitable for the present invention, precipitated colloidal calcium carbonate is approximately 0.16 to 0.60μ
In the case of wet-pulverized heavy calcium carbonate, it is approximately 0.40 to 1.0μ. Regarding these shapes, the former shape is a cubic shape or something close to it, and the latter shape is also similar to that shape or has an amorphous shape. The desirable specific surface area of the calcium carbonate produced in this way is 20,000 to /9 or more,
In particular, it is 30,000 cT1/9 or more.

Further, the desirable average particle size is 0.2 to 0.6μ, particularly 0.2μ to 0.6μ.
3 to 0.5μ, and if anything, a sedimented gelatinous material is preferable to a heavy wet-pulverized material.

Regarding the particle size distribution of these calcium carbonates, based on the above-mentioned distribution measurement method using talc, it is preferable that the coarse particles of 5 μ or more are as small as possible. It is preferably 8% by weight or less, particularly preferably 4% by weight or less. On the other hand, wet-pulverized heavy calcium carbonate has a content of 5μ or more and 15% by weight or less, especially 1
It is preferably 0% by weight or less. Here, the measurement of specific surface area is
It was carried out by the same method as for component (b) above, and the average particle size was measured using the same equipment as for component (b), i.e., a liquid phase sedimentation light transmission method. This is the value at the 50% point of the particle size cumulative distribution curve measured using a particle size distribution measuring device, such as the CP type manufactured by Shimadzu Corporation.

The particle size distribution of calcium carbonate dispersed in the resin can be determined by boiling point extraction of this composition with an organic solvent (for example, dissolving it in xylene by dipping at 130 to 140°C for about 10 hours, and then dissolving it in a cylindrical paper. It can be determined by measuring the particle size of calcium carbonate taken out by a method in which calcium carbonate is separated from a resin by passing through the resin) or by a method in which the composition is fired.

In addition, like the component (b) above, these calcium carbonates can also be used after surface treatment, and in that case, (b)
) produces the same effects as the ingredients.

The present invention is characterized by comprising each of the above-mentioned components (a) to (c), and the blending ratio of each of these components is as follows. (a) Component (crystalline propylene polymer resin) 30
-90% by weight, preferably 50-90% by weight Component (b) (specific particle size talc) 5-60% by weight, preferably 5-40% by weight (Cl component (fine calcium carbonate) 5-60% by weight, preferably 5
~40% by weight (however, (b) + (c) is (a) + (b)
) + 10 to 70% by weight based on (c), preferably 10
~50% by weight.

If the content of component (a) is less than 30% by weight, the physical property balance, especially impact strength, and surface properties, especially appearance, will be affected. Surface scratch resistance, moldability, etc. deteriorate, and if it exceeds 90% by weight, physical property balance, particularly rigidity, is insufficient, and dimensional stability, etc., is also at a low level, making it unsuitable. On the other hand, if component (b) is less than 5% by weight, the balance of physical properties, especially rigidity, is insufficient, and if it exceeds 60% by weight, the balance of physical properties, especially impact strength and surface properties, are poor and unsuitable. Furthermore, (
If component c) is out of the above range, surface scratch resistance and impact strength will be unsatisfactory. In addition, the blending weight ratio of the above-mentioned (a) component and (b) component is generally (a)/(b) from 0.1 to
10, preferably in the range of 0.3 to 6.

The composition of the present invention contains these (a) to (c) within a range (usually 30% by weight or less) that does not significantly impair the expression of its effects.
In addition to the ingredients, various additional ingredients can be added.

These additional ingredients include surface-treated or untreated talc and inorganic or organic fillers other than granular calcium carbonate (e.g. mica, glass fibers,
Barium sulfate, calcium silicate, clay, magnesium carbonate, alumina, silica, iron oxide, calcium sulfate,
Glass beads, glass powder, white carbon, hollow glass bulb, silica sand, silica stone, carbon black, aluminum hydroxide, magnesium hydroxide, zinc oxide, basic magnesium carbonate, asbestos, zeolite, white enamel, molybdenum, titanium oxide, silica Soil, sericite, shirasu, graphite, calcium hydroxide, calcium sulfite, gypsum fiber, carbon fiber, synthetic silicate fiber (PMF: processed mineral fiber), quartz powder, bentonite, metal hoseker, wood flour, sodium sulfate), rubber or latex components (e.g. ethylene-propylene copolymer rubber, styrene-butadiene rubber, 1,2-polybutadiene, butyl rubber, styrene-butadiene-styrene block copolymer, nitrile-butadiene rubber, polyisobutylene) , polybutadiene, polyisoprene, etc.),
Thermoplastic resins other than the above-mentioned propylene-ethylene copolymer resins used in the present invention (e.g., high, medium or low density polyethylene, α other than polypropylene such as polybutene)
Homopolymers of olefins, copolymers of α-olefins other than propylene, ethylene monovinyl acetate copolymers,
Olefin polymer resins such as copolymers of α-olefins other than propylene and vinyl monomers such as maleic anhydride grafted polyethylene, nylon, polycarbonate, acrylonitrile-butadiene-styrene resins (A
BS), resins other than olefin polymer resins such as polystyrene, polyvinyl chloride, polyphenylene oxide),
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. agent, flame retardant, crosslinking agent, flowability improver, weld strength improver, etc.

The addition of these various resins, inorganic fillers, and auxiliary agents not only improves the physical property balance and surface characteristics of the molded product (surface scratch resistance, gloss, weld appearance, silver streaks, flow marks, etc.), but also improves printability, paintability, It is effective in improving adhesiveness, plating properties, tapping properties, moldability, kneading properties, weld strength, durability, etc. These additional components can also be added in combination. The composition of the present invention can be produced using a conventional kneading machine such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a roll, or a Brabender plastogram kneader.

Normally, it is kneaded in an extruder or the like to form a pellet-like compound and then subjected to processing. However, in special cases, talc, calcium carbonate, and crystalline propylene polymer resin are directly fed to various molding machines. It is also possible to form the product while kneading it.

Alternatively, talc and calcium carbonate are kneaded in advance to a high concentration to form a masterbatch, which is then separately diluted with a crystalline propylene polymer resin or a propylene polymer resin containing talc or calcium carbonate for blend compounding.
It can also be molded. It is also possible to prepare a composition by dissolving the resin in an organic solvent or suspending it in an aqueous liquid, suspending talc and calcium carbonate in the aqueous liquid, and then emulsifying and mixing the two. At this time, as the resin dissolved in the solvent, a resin slurry after polymerization but before removal of the solvent may be used. 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, thermoforming, rotational molding, and lamination molding. The composition of the present invention thus obtained has a high balance of physical properties (impact strength and rigidity) and good surface properties of molded products (surface scratch resistance, , appearance), and at the same time, printability, paintability, tapping property, adhesiveness, moldability, kneading property, etc. were also good.

EXAMPLES The present invention will be explained in more detail with reference to Examples below, but these Examples are not intended to limit the invention.

The various measurement methods used here are as follows.

One side impact strength (Dubon impact strength): JIS 1K using 35mm x 50mm x 2 sheets.
Using the equipment shown in Section 6-13, 2, Method B (reference test) of 54OO, the diameter of the curvature of the dart and receiving plate is 1.
/2 inch condition, and the impact strength value was determined by the fall energy at 50% failure (measurement temperature: 23°C).
).

2 bending impact strength (notched isot impact strength) JI
Based on S-K7llO (measurement temperature 23°C).

3 stiffness (three-point bending modulus) Conforms to JIS-K72O3 (measured temperature 23°C).

4 Surface scratch resistance A pencil scratch test device specified in JIS-K54Ol was modified, and a 35 mm x 50 coin was set in the pencil setting section, and a 35 mm x 50
A test piece of 11 m x 2 mm with rough grain (average height of convex portions 0)
．． (111 m1 convex area average: 4 mJ) was rubbed on the sheet, and the marks were visually judged as follows (measurement temperature: 23°C).

5 Appearance Visually observe the surface condition of the rough grained sheet used in the previous section 4 for occurrence of silver streaks, flow marks, grain marks, etc.

Example-1 Talc produced in China was thoroughly pulverized using a micron mill, and further classified using a micron separator.

After that, precision classification was performed using a cyclone, and 10μ
Talc was obtained having a particle size distribution of 98% by weight below, 93% by weight below 5μ, and 24% by weight below 1μ. When the specific surface area of this talc was measured, it was found to be 48,500 (1-J
It was Mo V1/9.

In addition, no distribution of 15 μ or more was observed, and the distribution was substantially 15 μ
It was below. The average particle size of this product was 1.7μ, and the average aspect ratio was 5. On the other hand, start introducing air containing 20 to 30% carbon dioxide gas at a rate of 1501/min to slurry 101 containing slaked lime 6009 at a temperature of 20°C, and continue introducing air containing carbon dioxide gas until the pH is 7 or less. At this point, the introduction of air containing carbon dioxide gas was terminated.

The main particle size range of calcium carbonate at the completion of this reaction is 0.
05-0.9μ, and the temperature was about 50°C. Next, this slurry was kept at a temperature of about 45°C using an external heat source and left for 2 days with gentle stirring, and then filtered and dried to obtain a specific surface area of 37,200c. i/9
, cubic shaped precipitated calcium carbonate 700f with a coarse particle content of 2% by weight with an average particle size of 0.25μ, 5μ or more! I got it. Here, the content of coarse particles of 5μ or more is a value determined by a liquid phase sedimentation type light transmission method particle size distribution measuring device. In addition, the BET of this item
The specific surface area determined by the method was 120,000 (-Fit/9), and the average value of the dimensions observed on one side using a scanning electron microscope was 0.15 μ.

This calcium carbonate was surface-treated with calcium stearate (1% by weight based on the filler).

These tarta and calcium carbonate are mixed with propylene-ethylene block copolymer pellets having a melt flow rate (MFR) of 29/10 minutes and an ethylene content of 10% by weight in a predetermined ratio. 1 (1 part by weight per 100 parts by weight of the entire composition) in a super mixer made by Kawada Seisakusho for 2 minutes, and kneaded and granulated (230 iron C) in a PCM type twin screw extruder made by Ikegu Iron Works. A pellet-like compound was obtained. After that, a test piece was molded (23'C) using a screw-in-line injection molding machine manufactured by Meiki Manufacturing Co., Ltd., and its impact strength, rigidity, surface damage resistance, and appearance were evaluated.

The results are shown in Table 1 Waterfalls 1 to 3. All of these exhibited a good quality balance. Comparative Example-1 The same talc, precipitated colloidal calcium carbonate, propylene-ethylene copolymer, and pigment used in Example-1 were mixed, kneaded, and tested in the same manner except that their blending ratios were outside the specified range. A piece was prepared and evaluated.

Also, the specific surface area of talc obtained by changing the precise classification conditions is 15,500? /9 and 54% by weight of 10μ or less
, 28% by weight of 5μ or less and 4% by weight of 1μ or less, or calcium carbonate with a specific surface area of 15,500i/9 obtained by dry grinding and an average particle size of 1.5μ. The same evaluation was made for those that were present. The results are shown in Table 1/F6.4-12.

All of these had poor quality balance. That is, products containing talc alone and precipitated colloidal calcium carbonate alone lack impact strength and rigidity, and the inorganic filler content is 10%.
Those with less than 70% by weight had poor rigidity, and those with more than 70% by weight had poor impact strength and surface properties.

Example 1, Comparative Example - Using the same talc, precipitated colloidal calcium carbonate, propylene-ethylene copolymer and face example as in Example-1, various blending weight ratios of the talc and precipitated colloidal calcium carbonate were set, Mixing, kneading, specimen preparation, and evaluation were performed.

The results are shown in Table 1 Falls 13-18.

All of the Examples showed a good quality balance, and the Comparative Examples were poor.

That is, those with a talc/calcium carbonate ratio of less than 0.1 lacked rigidity, and those with a talc/calcium carbonate ratio of more than 10 had poor impact strength and surface properties. Example - MFRO. 49/10 minutes, a propylene-ethylene block copolymer with an ethylene content of 5% by weight, and a specific surface area of 53,000, 34,6009/1, respectively.
i1 particle size distribution is 98,96% by weight of 10μ or less, 5μ
Each talc (92.86% by weight below), 43.18% by weight (43.18% by weight) below 1μ, each with an average particle size of 1.5μ, 2.5μ
A distribution of 15 μ or more is not observed in the former case, and 0.0 μ in the latter case.
5% by weight) was obtained by the same manufacturing method as in Example-1 and had a similar morphology with a specific surface area of 23 and 20%, respectively.
0,40,8009/~, average particle size is 0.50, 0.0, respectively.
18μ precipitated colloidal calcium carbonate and specific surface area 22.0
00~/9, calcium carbonate obtained by a production method in which heavy calcium carbonate raw stone with an average particle size of 0.08μ is pre-pulverized in a super micron mill, and then wet-pulverized using a colloid mill, and Example- Similar to No. 1, the same amount of pigment was mixed at a predetermined ratio, kneaded, and a test piece was prepared for evaluation.

The BET specific surface areas of this precipitated colloidal calcium carbonate are 78,000 and 143,0000111/l, respectively, and the average dimensions observed with an electron microscope are 0.30 and 0.07μ, respectively.
The content of coarse particles of 5μ or more was 3.5% and 1.5% by weight, respectively.

The results are shown in Table 1/F6. Shown in 19-21.

All showed a good quality balance. In addition, the BET specific surface area of this wet-milled heavy calcium carbonate is 71,000c.
For Ti1/9, the average grain size observed using an electron microscope is 0.40.
It was μ.

Further, the content of coarse particles of 5μ or more was 5.5% by weight. Comparative Example - Same propylene polymer as Example - Pigment and specific surface area 28,000, 58,5009/0d1 particle size distribution 1 each
81.93% by weight of 0μ or less, 52.83% by weight of 5μ or less, 10.65% by weight of 1μ or less, 4% of average particle size each.
．． 6, 1.4μ of each talc (distribution of 15μ or more is 9% by weight for the former and 0.8% by weight for the latter), and the specific surface area is 45% for each.
, 100, 18,600 (-d/9, average particle size is 0.
10 and 1.20μ of precipitated colloidal calcium carbonate were mixed and kneaded in a predetermined ratio using the same method as in Example-m, and test pieces were prepared and evaluated.

In addition, the BET specific surface area of this precipitated calcium carbonate is 1
58,000, 49,000crii/9, and the average dimensions observed with an electron microscope are 0.04, 0.40μ, and 5
The content of coarse particles larger than μ was 4.5 and 5.5% by weight, respectively.

The results are shown in Table 2. /F6. Shown in 22-23.

All had poor quality balance. That is, the specific surface area of talc is less than 30,000 d/9, the particle size distribution is distributed in the coarse range, or conversely, the particle size distribution is excessively distributed below 1μ, and the precipitated colloidal calcium carbonate of outside the specified size is used. The material had a poor balance of physical properties, especially impact strength and surface properties.

Example - 15 parts by weight each of the same talc and precipitated calcium carbonate used in Example -, 1 part by weight of pigment, and the following (1) to (4)
7 types of each of the 4 types of propylene polymer pellets
0 parts by weight were mixed, kneaded, prepared as test pieces, and evaluated in the same manner as in Example-1.

(1) MFR7O9/10 min, propylene-ethylene block copolymer with ethylene content of 19% by weight (2) M
FRO. O59/10 min, propylene-ethylene block copolymer with ethylene content of 2% by weight (3) MFRl.
5f! /10 minutes, propylene with ethylene content of 8% by weight
Ethylene random copolymer (4) MFR39/10 min polypropylene results are roughly as shown in the table below,
All showed a good quality balance. In addition, all of these were good in terms of surface scratch resistance and appearance, each of which was grade 1.

Example-Example-1. The same composition as /F6.2 (pellet-like compound) was molded using a Mitsubishi Natco 800EXL screw in-line injection molding machine, and the width was 300n7! L
x length 600U77! A flat plate (with coarse graining) was molded to model large automobile parts such as instrument panels, consoles, and trims with a wall thickness of 311 m.

The obtained molded flat plate has practically sufficient impact strength, rigidity, scratch resistance, and weld strength for automobile parts, home appliance parts, etc., and is free from flo marks, silver streeters, grain marks, etc., and is glossy. It had an excellent appearance with excellent weld lines, inconspicuous beards, and inconspicuous warps.

Claims (1)

[Claims] 1 Consisting of each of the following components (a) to (c), (b) +
An inorganic filler-containing resin composition characterized in that (c) is 10 to 70% by weight based on (a) + (b) + (c). (a) 30-90% by weight of crystalline propylene polymer resin (b) 95% by weight or more with a specific surface area of 30,000cm^2/g or more and a particle size of 10μ or less, and 8% with a particle size of 5μ or less
5-60% by weight of talc with 5% by weight or more and 15-60% by weight of 1μ or less (c) Specific surface area 16,000cm^
2/g or more and an average particle size of 0.16 to 1.0μ, sedimentary colloid or wet powder frame heavy calcium carbonate 5 to
60% by weight (However, the above specific surface area means the value measured by the air permeation method, and the particle size and average particle size mean the values measured by the liquid phase sedimentation method light transmission method.)