JPH11279434A - Metallic pigment, composition for metallic tone molding product and metallic tone molding product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject pigment capable of solving problems of defective appearance caused by weld mark and weld dichroism by coating at least one side of each glossy polyhedral particle with a (translucent) transparent resin. SOLUTION: This pigment is obtained by coating at least one side of each glossy polyhedral particle with a (translucent) transparent resin. Preferably the polyhedral particles are composed of metal powder, nickel sulfide, cobalt sulfide, a metal oxide, white mica, titanium dioxide-coated mica, etc. Preferably the maximum diameter of the polyhedral particles is 1-200 μm and the average aspect ratio (the length of major axis/the length of minor axis) is preferably 1/8 to 1/1. A resin selected from an acrylic resin, a vinyl chloride-based resin, a polyethylene-based resin, a silicone-based resin, an epoxy-based resin, a natural rubber, etc., is preferably used as the (translucent) transparent resin. The ratio of the polyhedral particles in the pigment is 0.5-99.9 wt.% based on the total of the polyhedral particles and the (translucent) transparent resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a metallic pigment, a composition for a metallic molded article, and a metallic molded article using the same. More specifically, the present invention relates to a metallic pigment which does not cause a weld line or a problem of weld dichroism when injection-molded using the metallic pigment, a composition for a metallic molded article and a metallic molded article using the same.

[0002]

2. Description of the Related Art Conventionally, a metallic pigment constituted by mixing a certain amount of glossy particles in a thermoplastic resin, a composition for a metallic molded article using the same, and a metallic molded article having a metallic appearance are known. Have been. The metallic pigment and the composition for a metallic-like molded article using the metallic pigment are produced by melt-kneading glossy particles and a thermoplastic resin and uniformly dispersing the glossy particles in the thermoplastic resin. For example, Japanese Patent Application Laid-Open No. 58-37045 discloses a method for producing a composition for a metallic molded article by mixing a metal powder (metallic pigment) having an average particle diameter of 20 μm or less with an ABS resin. I have. Japanese Patent Application Laid-Open No. 50-20651 discloses a method for producing a composition for a metallic molded article by mixing a metal powder (metallic pigment) having an average particle size of 80 to 150 μm or less with a polyethylene terephthalate resin. It has been disclosed.

However, according to the methods disclosed in these publications, although it is possible to obtain a composition for a metallic molded article and a metallic molded article having a certain metallic appearance, the metallic molded article is injection molded. In such a case, there is a problem that a so-called hollow line is easily generated at a point where the resins merge from different directions inside the mold.

[0004] Here, the "work line" is made of a resin which does not contain a metallic pigment which is generated when molten resins containing a metallic pigment flow in a mold and merge with each other from different directions. It is defined as a layer (area). In this regard, a mechanism for generating a machining line will be described in detail with reference to FIGS. 1 (a) to 1 (c).

FIG. 1A is a view showing a state immediately after a resin is injected into a mold (not shown). In FIG. A model of a state in which a molten resin (also simply referred to as a resin) 14 including a metallic pigment 12 is flowing toward a portion where the toner is generated. Further, in the state where the resin 14 is flowing freely, the content of the metallic pigment 12 per unit volume contained in the resin 14 is uniform, and there is no deviation. In this example, scale-like metal particles are used as the metallic pigment 12.

FIG. 1B shows the inside of a mold (not shown).
In the drawing, the molten resin 1 flowing from the left and right direction to the point A (the point where a rework line is generated in the future)
4 schematically show the state immediately after each collision. In the state where the molten resin 14 partially collides in this manner, the metallic pigment 1 contained in the molten resin 14
2 is slightly biased, and the amount of the metallic pigment 12 near the point A is large. At this point, the occurrence of a modified line cannot be generally recognized.

FIG. 1 (c) shows the molten resin 14 flowing in a mold (not shown) from the left / right direction toward a point A (a point at which a cutting line is generated in the future). , Respectively, modelly show a state immediately after the occurrence of the collision line 16 and the generation of the fabrication line 16. In such a state, the content of the metallic pigment 12 per unit volume is uneven, and the amount of the metallic pigment 12 near the point A is considerably large.

[0008] At the joint of the molten resin 14, a layer that does not include the metallic pigment 12, that is, a weld line 16 is generally generated due to the relationship between the fluidity of the resin 14 and the fluidity of the metallic pigment 12. In the drawing, this weld line (layer) is shown as a region sandwiched between two dotted lines. The part corresponding to this weld line 16 is
Only the resin 14 exists, does not contain the metallic pigment 12, and cannot reflect incident light. Accordingly, light is absorbed, so that it is generally recognized as a black streak, and the appearance of the resin molded product 18 is significantly impaired.

When a flaky metal powder 12 as shown in FIG. 1 is used as the metallic pigment, the flaky metal powder (metallic pigment) 12
Therefore, the scaly metal powder 12 is present perpendicularly to the surface of the molded product in the hollow line 16. In this respect, in FIG. 1A, most of the metal powders 12 are oriented horizontally in the drawing, whereas in the vicinity of the hollow line in FIG. 1C, most of the metal powders 12 are drawn in the drawing. The fact that it is oriented vertically indicates this.

That is, in the vicinity of the processing line 16, the short diameter portion of the flaky metal powder 12 is
8 (on the upper side in FIG. 1 (c)). Accordingly, the minor diameter portion of the flaky metal powder 12 usually has no metallic luster. In this case as well, the weld line 16 is recognized as a black line with further emphasis, impairing the appearance of the resin molded product 18. It will be.

As a method for solving the problem of the occurrence of weld lines, Japanese Patent Publication No. Hei 4-27932 discloses that any thermoplastic resin may have an average particle diameter of 10 μm to 1 μm.
There has been proposed a method of mixing mm metal particles. This method uses a metal powder having an appropriate average particle diameter and makes the average distance between the particles larger than the width of the weld line to make the black streak of the weld line apparently inconspicuous. However, in this method, the addition amount and the particle size of the metal powder are severely limited, and when the metal powder is mixed in a large amount, or when the particle size of the metal particles is small, the effect of improving the weld line recognition can be obtained. There was a problem that there is no.

On the other hand, when a conventional metallic pigment is used,
There is also a problem that a problem of so-called Weldoni color is likely to occur. In this regard, referring to FIG. 1 again, the molten resin 14 containing the metallic pigment 12 flows while being cooled in a mold (not shown) (FIGS. 1A to 1C).
(B)), and the entire area inside the mold is filled (FIG. 1 (c)). In the process of cooling the molten resin 14, FIG.
Is cooled from the part B which is in contact with the mold as shown in (1), the flow velocity is reduced, and therefore, a flow velocity gradient due to the temperature difference is generated toward the inside of the resin 14.

Therefore, since the metallic pigment 12 existing near the contact surface between the mold and the fluid resin 14 receives a force proportional to the flow speed, the metallic pigment 12 tends to be inclined at a certain angle with respect to the mold surface. Become. Therefore, the metallic pigment 12
In this case, the reflection direction of the reflected light is not uniform, and the reflected light amount is biased. Therefore, by changing the angle at which the resin molded product 18 is viewed, for example, with the weld line 16 interposed therebetween,
When the resin molded product 18 was viewed from the left and right oblique directions, the metallic feeling of the resin molded product 18 changed, and the appearance of the resin molded product 18 was impaired.

Therefore, as a method for improving the problem of the Weldoni color, a method using a metallic pigment obtained by plating a spherical glass surface with gold has been proposed. According to this method, although the problem of weld dichroism on the surface of the molded product can be somewhat improved, a new problem that the amount of reflected light is relatively small and the metallic feeling is insufficient due to the spherical shape of the metallic pigment is seen. Was.

Therefore, when a large amount of a metallic pigment is added in order to increase the metallic feeling, there has been a problem that the mechanical properties of a molded product are reduced. In addition, since gold plating is used, there is also a problem that when a large amount of metallic pigment is used, the material cost increases. In addition, even if using such a gold-plated metallic pigment, since only a metallic feeling based on gold can be obtained, it is not possible to respond to the diversity of consumers, and in a metallic feeling based on gold, There was also a problem that the color of the reflected light itself was not so preferred.

[0016]

As a result of intensive studies on the above-mentioned problems, the inventors have found that at least one surface (glossy surface) of glossy polyhedral particles is coated with a transparent resin or a translucent resin to form a weld line. The inventors have found that the problems of generation and Weldoni color can be solved, and have completed the present invention. That is, the present invention solves the problem of appearance defects caused by the appearance of weld marks and Weldoni color, and a metallic pigment capable of obtaining an excellent metallic appearance with a small amount of addition, and a metallic molding using the same. An object of the present invention is to provide a product composition and a metallic-shaped molded product.

[0017]

SUMMARY OF THE INVENTION The present invention relates to a metallic pigment in which at least one surface of glossy polyhedral particles is coated with a transparent resin or a translucent resin. By configuring the metallic pigment in this way, even when the molten resins containing the metallic pigment flowing from different directions merge with each other, the metallic pigment can be oriented against the flowing direction of the molten resin. Therefore, the metallic pigment tends to exist in parallel to the molded product surface,
The incident light can be sufficiently reflected, and the weld line is not recognized. Also, even if a flow velocity gradient due to a temperature difference is generated inside the resin in the process of cooling the molten resin and a force proportional to the flow velocity is generated on the metallic pigment, the flow direction of the molten resin is opposite to the flow direction of the molten resin. The metallic pigment can be oriented. Therefore, the metallic pigment exists parallel to the mold surface, that is, the surface of the molded product, and can solve the problem of weld dichroism.

In constituting the metallic pigment of the present invention, glossy polyhedral particles include metal powder,
It is preferable to use at least one polyhedral particle selected from the group consisting of nickel sulfide, cobalt sulfide, manganese sulfide, metal oxide, muscovite, biotite, synthetic mica and titanium dioxide coated mica.

Further, in constituting the metallic pigment of the present invention, the average shape ratio (length of the major axis / length of the minor axis) of the polyhedral particles having gloss is in the range of 1/8 to 1/1. Is preferable. When the average shape ratio of the polyhedral particles having gloss is out of this range, a weld line tends to occur or a problem of weld dichroism tends to occur.

In constituting the metallic pigment of the present invention, the maximum diameter of glossy polyhedral particles is from 1 to 20.
It is preferable to set the value within a range of 0 μm. By setting the value within such a range, a metallic pigment having good dispersibility in a resin can be obtained. Therefore, an excellent metallic appearance can be obtained, and the surface smoothness of the obtained metallic molded article is not impaired.

Further, in constituting the metallic pigment of the present invention, the ratio of the glossy polyhedral particles in the metallic pigment to the total amount of the resin (transparent resin or translucent resin) and the glossy polyhedral particles, 0.5-99.9
It is preferable to set the value in the range of% by weight. When the ratio of the glossy polyhedral particles in the metallic pigment is less than 0.5% by weight, the metallic feeling tends to decrease, while when it exceeds 99.9% by weight, the glossy polyhedral particles are uniformly mixed. It tends to be difficult to disperse.

The glass transition temperature of the transparent resin or the translucent resin used for the metallic pigment of the present invention is 180.
It is preferable to set the value to not less than ° C. By using such a transparent resin or translucent resin, excellent shape retention can be obtained even when melt-kneaded, and the resin and the glossy particles are less likely to peel off.

Further, it is preferable to crosslink the transparent resin or the translucent resin used for the metallic pigment of the present invention.
By using such a transparent resin or translucent resin, even when melt-kneaded, it has excellent shape retention and has little tendency to peel off from glossy particles. Further, when the resin is crosslinked, the solvent resistance is dramatically improved. Therefore, the metallic pigment can be dispersed and mixed in the resin using a solvent.

The transparent resin or translucent resin used for the metallic pigment of the present invention includes acrylic resin, styrene resin, vinyl chloride resin, polypropylene resin, polyethylene resin, polycarbonate resin, polyester resin, At least one selected from the group consisting of a polyamide resin, a polyimide resin, an ABS resin, an ASA resin, a fluorine resin, a silicone resin, an epoxy resin, a phenol resin, a urethane resin, a natural rubber and a synthetic rubber. Preferably, it is one resin.

In constituting the metallic pigment of the present invention, the transparent resin or the translucent resin is at least one coupling agent selected from the group consisting of a silane coupling agent, a titanium coupling agent and an aluminum coupling agent. Is preferable. When the coupling agent is contained as described above, the resin (transparent resin or translucent resin) and the glossy particles are firmly adhered to each other, and the tendency to peel off in a process such as injection molding is reduced.

In constituting the metallic pigment of the present invention, the maximum diameter of the metallic pigment is 1 to 200 μm.
It is preferable that the value be within the range of m. By setting the value within such a range, good dispersibility in the resin is obtained, and therefore, an excellent metallic appearance is obtained, and the surface smoothness of the obtained metallic molded article tends to be impaired. Few.

In constituting the metallic pigment of the present invention, it is preferable that the outer shape of the metallic pigment is a quadrangular prism. By making the outer shape of the metallic pigment substantially a quadrangular prism, the occurrence of weld lines can be more effectively prevented.

Another aspect of the present invention is a composition for a metallic molded article, comprising 0.1 to 30 parts by weight of any one of the above-mentioned metallic pigments based on 100 parts by weight of a thermoplastic resin. About. By containing a metallic pigment in such a range, when a metallic-like molded article is produced, an excellent metallic appearance is obtained, while the mechanical strength of the metallic-like molded article is less likely to decrease. .

Another aspect of the present invention relates to a metallic molded article obtained by using the above-described composition for a metallic molded article.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION The glossy particles, transparent resin and translucent resin, the metallic pigment, the method for producing the metallic pigment, and the metallic molded article constituting the metallic pigment of the present invention will be specifically described.

1. Glossy Polyhedral Particles The glossy polyhedral particles used in the present invention (sometimes simply referred to as glossy particles) are not particularly limited as long as they have gloss. For example, aluminum, gold, silver , Copper, nickel, titanium, metal powders such as stainless steel, nickel sulfide, cobalt sulfide, manganese sulfide,
The metal oxide, muscovite and black cloud include synthetic mica and titanium disulfide-coated mica. These glossy particles can be used alone or in combination of two or more. In particular, aluminum is preferred as the glossy particles used in the present invention because it has high gloss and is relatively light in weight and easy to handle.

The maximum diameter of the glossy particles is not particularly limited, but is preferably 1 to 200 μm from the viewpoint that a more excellent metallic appearance can be easily obtained and the handling can be easily performed.
m, more preferably 5 to 100 μm, even more preferably 10 to 80 μm.

Although the shape of the glossy particles is not particularly limited, the polyhedral structure of the glossy particles is 4 to 100-faced, because a more excellent metallic appearance is easily obtained and the handling is easy. Some are preferred, 6-5
A 0-hedron is more preferable, and a 6- to 10-hedron is more preferable.

The average shape ratio of glossy particles (the value obtained by reducing the length of the major axis by the length of the minor axis) is not particularly limited, but a more excellent metallic appearance can be obtained. From the viewpoint of easy handling and easy handling, the value is preferably in the range of 1/8 to 1/1, more preferably in the range of 1/7 to 1/1, and 1/6 to 1 / l. Those within the range of 1 are more preferred.

2. Transparent Resin and Translucent Resin In the present invention, the transparent resin coated on the glossy particles refers to a resin having a light transmittance of 50% or more, and similarly, the translucent resin has a light transmittance of 10% to 50%. It is defined as a resin within the range of less than. By using such a resin,
There is no tendency to significantly lower the reflectance of the metallic pigment, and an excellent metallic appearance can be obtained. In the case of a transparent resin, a resin having a light transmittance of 80% or more is more preferable, and a resin having a light transmittance of 90% or more is more preferable.

The transparent resin and the translucent resin to be coated on the glossy particles are cross-linked by using a cross-linking agent or the like, or have a glass transition temperature of 180 ° C. or more, more preferably 185 ° C. or more, further preferably 190 ° C. or more. A resin having a temperature is preferred. By using such a resin,
Form retention and adhesion to glossy particles are improved, and there is no problem of poor appearance such as weld marks and Weldoni color.By adding a small amount of metallic pigment, a more excellent metallic appearance can be obtained. .

Specifically, preferred transparent resins and translucent resins include modified epoxy resins, unsaturated polyester resins, resole-type phenol resins, melamine resins, crosslinkable polyurethane resins, crosslinkable acrylic resins, crosslinkable acrylic urethane resins, and the like. Thermosetting resin. In addition,
These resins can be used alone or in combination of two or more.

Examples of the resin having a glass transition temperature of 180 ° C. or higher include polyamide resin, polyimide resin, polyamideimide resin, polysulfone, polyethersulfone, polyphenylene ester, polyetherimide, polyphenylene sulfide, and polyoxybenzoyl. And other engineering plastics.
In addition, these resins can be used alone,
Alternatively, two or more kinds can be used in combination.

These resins may contain a coloring agent, a filler, an antioxidant, an ultraviolet absorber, a silane coupling agent, a titanium coupling agent, an aluminum coupling agent, a flame retardant, etc., if necessary. It is also preferable to add them. In particular, the addition of a silane coupling agent, a titanium coupling agent, and an aluminum coupling agent is preferable in that the adhesion to the glossy particles when the resin is coated is improved. Further, when these additives are added, the amount of the additives is based on 100 parts by weight of the transparent resin and the translucent resin.
Preferably, the value is in the range of 0.1 to 20 parts by weight,
The value is more preferably in the range of 0.5 to 10 parts by weight, and even more preferably in the range of 1.0 to 5 parts by weight.

3. Metallic pigment FIG. 2 shows an embodiment of the metallic pigment. The metallic pigment 26 will be described with reference to FIG. 2. The metallic pigment 26 is formed so that the first resin layer 20, the glossy particle layer 24, and the second resin layer 22 have the same thickness from the upper layer. It is configured as a substantially hexahedron (cube) having an average shape ratio (length of the major axis / length of the minor axis) of 1/1. In this case, it is preferable in terms of manufacturing that the length of one side of the hexahedron be a value within the range of 1 to 200 μm.

The first resin layer is preferably made of a transparent resin or a translucent resin. The thickness is not particularly limited, but is preferably in the range of 0.3 μm to 70 μm. Also, the glossy particle layer 24
Is as described above, but when a hexahedral metallic pigment is formed using a metal such as aluminum, the thickness thereof is equivalent to that of the first resin layer 20, that is, 0.3 μm to 70 μm.
It is preferable to set the value in the range of μm.

It is preferable that the second resin layer 22 is also made of a transparent resin or a translucent resin. Further, the thickness is not particularly limited, but 0.3 μm to
Preferably, the value is in the range of 70 μm. Note that FIG.
As shown in the figure, when the resin layers (the first resin layer 20 and the second resin layer 22) are provided on both sides of the glossy particle layer 24, the first resin layer 20 or the second resin layer One of the layers 22 may be made of an opaque resin.

The maximum diameter of the metallic pigment is preferably 1 to 2
The value is preferably within a range of 00 μm,
The value is more preferably in the range of 10 μm.
More preferably, the value is in the range of μm. When the maximum diameter of the metallic pigment is less than 1 μm, the metallic feeling of the resin molded article tends to be reduced or the production tends to be difficult. On the other hand, when the maximum diameter exceeds 200 μm, the foreign matter is mixed in the resin molded article. Tends to see.

The average shape ratio (length of the major axis / length of the minor axis) of the metallic pigment is preferably in the range of 1/8 to 1/1, and 1/7 to 1 is preferable. The value is more preferably in the range of / 1, and even more preferably in the range of 1/6 to 1/1. Average shape ratio is 1/8
If it is less than 30, when the thermoplastic resin is melt-kneaded, the metallic pigment tends to be crushed.

The ratio of the glossy particles in the metallic pigment is preferably in the range of 0.5 to 99.9% by weight based on the total amount of the transparent resin and the translucent resin and the glossy particles. , 1.0 to 95% by weight, and more preferably 2.0 to 90% by weight. 0.5% by weight of glossy particles
When the ratio is less than 10%, it tends to be difficult to coat the glossy particles with the transparent resin and the translucent resin. On the other hand, when the ratio of the glossy particles exceeds 99.9% by weight, the dispersion becomes difficult and the metallic pigment Tends to easily generate dust during the production of

4. Production method of the metallic pigment The production method of the metallic pigment is not particularly limited, for example, commercially available glossy particles are arranged in a plane,
By pouring the molten resin from above, it can be easily manufactured. Alternatively, it can also be obtained by coating a metal thin film such as aluminum with a transparent resin and / or a translucent resin, and cutting the resulting coating into a predetermined size.

5. Composition for metallic molded article The composition for a metallic molded article can be obtained by adding the above-mentioned metallic pigment to a thermoplastic resin or the like in a certain amount range and mixing and dispersing the mixture with a stirrer.

Here, the compounding amount of the metallic pigment in the metallic molded article is set to 0.1% with respect to the thermoplastic resin.
-30% by weight, preferably 0.5 to 30% by weight.
More preferably, the value is in the range of ~ 20% by weight.
It is particularly preferred that the value be in the range of 1.0 to 10% by weight. If the amount of the metallic pigment is less than 0.1% by weight, an excellent metallic appearance tends to be hardly developed, and if it exceeds 30% by weight, the mechanical properties of the thermoplastic resin may be reduced. In addition, the mixing and dispersion of the metallic pigment tends to be difficult.

The kind of the thermoplastic resin used for producing the metallic-like molded article is not particularly limited, but examples thereof include an acrylic resin, a styrene resin,
A vinyl chloride resin, a polypropylene resin, a polyethylene resin, a polycarbonate resin, a polyester resin, a polyamide resin, a polyimide resin, a polyamideimide resin, an ABS resin, an ASA resin, or the like can be used. These resins may be used alone or in combination of two or more.

In the thermoplastic resin, if necessary,
It is also preferable to add a coloring agent, a filler, an antioxidant, an ultraviolet absorber, a silane coupling agent, an aluminum coupling agent, a titanium coupling agent, a flame retardant, and the like. In that case, the amount of these additives is preferably in the range of 0.1 to 20 parts by weight, and more preferably in the range of 0.5 to 10 parts by weight, based on 100 parts by weight of the thermoplastic resin. Is more preferable, and the value is more preferably in the range of 1.0 to 5 parts by weight.

6. Metallic tone molded article A metallic tone molded article can be obtained by molding the composition for a metallic tone molded article into a predetermined shape using a molding method such as injection molding.

[0052]

[Embodiment 1] A. First Embodiment Preparation of Metallic Pigment and Metallic Tone Molded Product (1) Preparation of Metallic Pigment Scale-like aluminum powder (average particle diameter: 30 μm) was used as glossy particles, and the aluminum powder was arranged in a flat plate shape in a container. Next, from above the aluminum powder, a crosslinked acrylic resin (glass transition point 185) was used as a transparent resin.
° C, styrene / acrylonitrile / phenylmaleimide / 1,6-hexanediol diacrylate = 40/2
0/30/10 (weight ratio) in a molten state, and the weight ratio of aluminum powder / acrylic resin was 85 /
An acrylic resin was coated so as to have a ratio of 15.

Next, after cooling the temperature in the container to room temperature,
The aluminum powder coated with the acrylic resin was taken out. Then, a sieving process is performed, and the average particle diameter is 50 μm.
Was obtained. The average shape ratio of the obtained metallic pigment (a value obtained by reducing the shortest diameter of the metallic pigment by the longest diameter) using an optical microscope was 1/4.

(2) Preparation of Metallic Tone Molded Product The obtained metallic pigment was treated with AAS resin VW8700.
(Manufactured by Hitachi Chemical Co., Ltd.) so as to have a ratio of 0.1% by weight.
G) was mixed at a ratio of 0.6% by weight to obtain a composition for a metallic molded article. This composition is then
The mixture was melt-kneaded using a twin-screw extruder to obtain pellets having a length of about 1 mm. And the obtained pellet was heat-molded on condition of the following, and the metallic-like molded article was obtained. Pellet drying: 80 ° C. × 3 hours Cylinder temperature: 220 ° C. Injection pressure: 520 Kg / cm ² Mold temperature: 45 ° C.

B. Evaluation of Metallic Tone Molded Product (1) Evaluation of Weld Line The obtained metallic tone molded product was visually observed, and the occurrence of weld lines was evaluated according to the following criteria.
Shown in As understood from the results, no weld line was observed, and it was confirmed that the problem of the weld line was solved by the invention of Example 1.

It should be noted that if the evaluation is △ or more, there is no practical problem, 〇 is more preferable, and ◎ is more preferable. A: No weld line is observed. 〇: Weld lines are slightly observed. Δ: The weld line is blurred and observed. ×: Weld lines are clearly (clearly) observed.

(2) Evaluation of Weld Dichroism The obtained metallic-like molded product was visually observed from different angles (45 ° or more), and the evaluation of the weld dichroism was performed according to the following criteria. It is shown in Table 1. As can be understood from the results, when viewed from different angles, the same appearance was exhibited, and it was confirmed that the problem of weld dichroism was solved by the invention of Example 1.

It should be noted that if the evaluation is な く or more, there is no practical problem, 〇 is more preferable, and ◎ is more preferable. ：: Same appearance when viewed from different angles. 〇: slightly different appearance when viewed from different angles. Δ: slightly different appearance when viewed from different angles. ×: Appearance is clearly different when viewed from different angles.

(3) Measurement of glossiness The glossiness of the obtained metallic-tone molded product was measured in accordance with JIS K6.
319. Using a VG-IB type device manufactured by Nippon Denshoku Industries Co., Ltd. as a gloss meter, the gloss of the metallic tone molded article at an incident angle of 60 ° was measured. Table 1 shows the results. As understood from the results, it was confirmed that in the invention of Example 1, an excellent gloss value was obtained. If the value of the glossiness is 90 or more, there is no practical problem, and if it is 95 or more, it is preferable that it is 97 or more.

(4) Measurement of Izod impact strength
It was measured in accordance with ASTM D-256. As an Izod impact measuring device, a measuring device manufactured by Toyo Seiki was used.
Further, the metallic-shaped molded product was processed into a sample having a notch with a thickness of 1/8 inch to form a test piece, and the measurement temperature was 23 ° C.
The measurement was performed under the conditions of ± 2 ° C. Table 1 shows the results. As understood from the results, it was confirmed that in the invention of Example 1, an excellent value of Izod impact strength was obtained. If the value of the Izod impact strength is 60 or more, there is no practical problem in terms of impact resistance, and it is preferably 100 or more, and more preferably 150 or more.

(5) Measurement of Tensile Strength The tensile strength of the obtained metallic molded article was measured according to JIS.
It was measured according to K6319. As a tensile strength measuring device, UTM-III-50 manufactured by Orientec Co., Ltd.
A type 0 apparatus was used. Further, the metallic-shaped molded product was processed into a sample having a notch with a thickness of 1/8 inch to obtain a test piece, which was measured at a measurement temperature of 23 ° C. ± 2 ° C. Table 1 shows the results. As understood from the results, it was confirmed that in the invention of Example 1, an excellent value of the tensile strength was obtained. In addition, if the value of the tensile strength is 40 MPa or more, there is no practical problem, and it is preferably 45 MPa or more, and more preferably 48 MPa or more.

[0062]

[Table 1]

Example 2 A. Preparation of Metallic Pigment and Metallic Toned Molded Product (1) Preparation of Metallic Pigment Scale-like aluminum powder (average particle diameter: 60 μm) was used as glossy particles, and the aluminum powder was arranged in a flat plate shape in a container. Next, from above the aluminum powder, an acrylic resin as a transparent resin (glass transition point: 185 ° C.)
Was poured in a molten state, and the acrylic resin was coated so that the weight ratio of aluminum powder / acrylic resin was 85/15.

Next, after cooling the temperature in the container to room temperature,
The aluminum powder coated with the acrylic resin was taken out. Then, a sieving process is performed, and the average particle diameter is 50 μm.
Was obtained. The average shape ratio (the value obtained by reducing the shortest diameter of the metallic pigment by the longest diameter) of the obtained metallic pigment was measured using an optical microscope, and the value of the average shape ratio was 1/2.

(2) Preparation of Metallic Tone Molded Product When the total amount is 100% by weight, the obtained metallic pigment is added to 99.3% by weight of AAS resin VW8700 (manufactured by Hitachi Chemical Co., Ltd.). 0.1% by weight, and a colorant H3G (Sumitomo Chemical Co., Ltd.)
Was mixed at a ratio of 0.6% by weight to obtain a composition for a metallic molded article.

Next, this composition was melt-kneaded using a twin-screw extruder to obtain pellets having a length of about 1 mm.
And the obtained pellet was heat-molded on condition of the following, and the metallic-like molded article was obtained. Pellet drying: 80 ° C. × 3 hours Cylinder temperature: 220 ° C. Injection pressure: 520 Kg / cm ² Mold temperature: 45 ° C.

B. Evaluation of Metallic Toned Product Under the same conditions and procedures as in Example 1, the evaluation of the weld line, the evaluation of dichroism, the measurement of the glossiness, the measurement of the Izod impact strength, and the measurement of the tensile strength were performed.
Table 1 shows the results. As understood from the results in Table 1, the metallic-shaped molded product of Example 2 had no weld line observed, and exhibited the same appearance even when viewed from different angles. Further, the value of glossiness was 95, the value of Izod impact strength was 116.0, and the value of tensile strength was 48 MPa, and excellent values were obtained.

Embodiment 3 A. Preparation of Metallic Pigment and Metallic Toned Molded Product (1) Preparation of Metallic Pigment Scale-like aluminum powder (average particle diameter: 60 μm) was used as glossy particles, and the aluminum powder was arranged in a flat plate shape in a container. Next, the crosslinked acrylic resin used in Example 1 was poured in a molten state from above the aluminum powder as a transparent resin, and the acrylic resin was mixed such that the weight ratio of aluminum powder / acrylic resin was 85/15. System resin was coated.

Next, after cooling the temperature in the container to room temperature,
The aluminum powder coated with the acrylic resin was taken out. Then, a sieving process is performed, and the average particle diameter is 50 μm.
Was obtained. The average shape ratio of the obtained metallic pigment (a value obtained by reducing the shortest diameter of the metallic pigment by the longest diameter) using an optical microscope was 1/4.

(2) Production of Metallic Tone Molded Product When the total amount is 100% by weight, the obtained metallic pigment is added to 99.3% by weight of AAS resin VW8700 (manufactured by Hitachi Chemical Co., Ltd.). 0.1% by weight, and a colorant H3G (Sumitomo Chemical Co., Ltd.)
Was mixed at a ratio of 0.6% by weight to obtain a composition for a metallic molded article.

Next, the composition was melt-kneaded using a twin-screw extruder to obtain pellets having a length of about 1 mm.
And the obtained pellet was heat-molded on condition of the following, and the metallic-like molded article was obtained. Pellet drying: 80 ° C. × 3 hours Cylinder temperature: 220 ° C. Injection pressure: 520 Kg / cm ² Mold temperature: 45 ° C.

B. Evaluation of Metallic Toned Product Under the same conditions and procedures as in Example 1, the evaluation of the weld line, the evaluation of dichroism, the measurement of the glossiness, the measurement of the Izod impact strength, and the measurement of the tensile strength were performed.
Table 1 shows the results. As understood from the results in Table 1, no metallic line was observed in the metallic-shaped molded product of Example 3, and the same appearance was exhibited even when viewed from different angles. Further, the value of glossiness was 97, the value of Izod impact strength was 112.0, and the value of tensile strength was 48 MPa, and excellent values were obtained respectively.

Comparative Example 1 A. Preparation of Metallic Pigment and Metallic Toned Product (1) Preparation of Metallic Pigment As the metallic pigment, flaky aluminum powder (average particle diameter 60 μm) was used as it was. When the average shape ratio of the metallic pigment was measured using an optical microscope, the value of the average shape ratio was 1/4.

(2) Preparation of Metallic Tone Molded Product Assuming that the total amount is 100% by weight, 0.1% of metallic pigment is added to 99.3% by weight of AAS resin VW8700 (manufactured by Hitachi Chemical Co., Ltd.). % By weight, and further added a coloring agent H3G (manufactured by Sumitomo Chemical Co., Ltd.) to 0.6%.
The composition was mixed so as to be in a ratio of% by weight to obtain a composition for a metallic molded article.

Next, the composition was melt-kneaded using a twin-screw extruder to obtain pellets having a length of about 1 mm.
And the obtained pellet was heat-molded on condition of the following, and the metallic-like molded article was obtained. Pellet drying: 80 ° C. × 3 hours Cylinder temperature: 220 ° C. Injection pressure: 520 Kg / cm ² Mold temperature: 45 ° C.

B. Evaluation of Metallic Toned Product Under the same conditions and procedures as in Example 1, the evaluation of the weld line, the evaluation of dichroism, the measurement of the glossiness, the measurement of the Izod impact strength, and the measurement of the tensile strength were performed.
Table 1 shows the results. As understood from the results in Table 1, in the metallic molded article of Comparative Example 1,
Weld lines were clearly observed and had a distinctly different appearance when viewed from different angles.

[0077]

According to the metallic pigment of the present invention, it is possible to provide a metallic molded article which does not generate a weld line, has excellent Weldoni color properties, and has excellent gloss and mechanical properties.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing the occurrence of a weld line.

FIG. 2 is a diagram schematically showing the structure of a metallic pigment of the present invention.

[Explanation of symbols]

 12, 26: metallic pigment 14: molten resin 16: weld line 18: metallic molded product 20: first resin layer 22: second resin layer 24: glossy particle layer

Claims (13)

[Claims] 1. A metallic pigment comprising at least one surface of glossy polyhedral particles coated with a transparent resin or a translucent resin. 2. The method according to claim 1, wherein the polyhedral particles having gloss are metal powder,
The metallic pigment according to claim 1, which is at least one selected from the group consisting of nickel sulfide, cobalt sulfide, manganese sulfide, metal oxide, muscovite, biotite, synthetic mica, and titanium dioxide-coated mica. 3. The metallic pigment according to claim 1, wherein the average shape ratio of the polyhedral particles having gloss is a value within a range of 1/8 to 1/1. 4. The maximum diameter of the polyhedral particles having gloss is 1 to 4.
The metallic pigment according to any one of claims 1 to 3, wherein the metallic pigment has a value within a range of 200 µm. 5. The ratio of the glossy polyhedral particles in the metallic pigment is in the range of 0.5 to 99.9% by weight based on the total amount of the transparent resin or translucent resin and the glossy polyhedral particles. The metallic pigment according to any one of claims 1 to 4, wherein the metallic pigment is a value. 6. The metallic pigment according to claim 1, wherein the transparent resin or the translucent resin has a glass transition temperature of 180 ° C. or higher. 7. The metallic pigment according to claim 1, wherein a transparent resin or a translucent resin is crosslinked. 8. The transparent resin or the translucent resin is an acrylic resin, a styrene resin, a vinyl chloride resin, a polypropylene resin, a polyethylene resin, a polycarbonate resin, a polyester resin, a polyamide resin, a polyimide resin, At least one resin selected from the group consisting of ABS resin, ASA resin, fluorine resin, silicon resin, epoxy resin, phenol resin, urethane resin, natural rubber, and synthetic rubber.
8. The metallic pigment according to any one of items 7 to 7. 9. The transparent resin or the translucent resin contains at least one coupling agent selected from the group consisting of a silane coupling agent, a titanium coupling agent, and an aluminum coupling agent. The metallic pigment according to any one of the above. 10. The maximum diameter of the metallic pigment is from 1 to 200.
The metallic pigment according to any one of claims 1 to 9, wherein the metallic pigment has a value in a range of µm. 11. The metallic pigment according to claim 1, wherein the outer shape of the metallic pigment is a quadrangular prism. 12. With respect to 100 parts by weight of the thermoplastic resin,
A composition for a metallic molded article, comprising 0.1 to 30 parts by weight of the metallic pigment according to any one of claims 1 to 11. 13. A metallic molded article obtained by using the composition for a metallic molded article according to claim 12.