JP3032749B2 - Colorants for plastics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colorant for plastics used by adding to synthetic resin molded articles and paints, and more particularly to a colorant for plastics which makes fibers and flakes appear as patterns.

[0002]

2. Description of the Related Art In general, inorganic pigments, organic pigments or dyes are known as colorants added to synthetic resins and paints.

[0003] Of these pigments, when dispersed in a substrate to be colored, they usually color the substrate to be colored in a uniform tone without any pattern. This type of colorant has a particle size of 0.01 m
m or less. Such pigments generally have a surface area of about 0.02 μm to 5 μm because the smaller the particles, the larger the surface area and the higher the coloring power.

On the other hand, dyes for plastics are molecularly dissolved by kneading at the time of heat melting, so that the particles of the dye are not visible on the base material to be colored, that is, the color tone and the particle size are not related, and the plastic is formed in a uniform pattern. Color.

[0005] The inventor of the present application has developed a pattern in which spots or thread-like patterns appear on the surface of a colored plastic molded product, thereby increasing the commercial value of the plastic product and meeting market needs. A developing colorant is disclosed in Japanese Patent Application Laid-Open No. 2-68373.

This coloring agent is made of a viscose derivative cellophane film or viscose rayon, and cut into fibers of an appropriate length, dyed with a reactive dye in order to prevent water absorption, which is a drawback. This can cause spots or thread-like patterns to appear on the thermoplastic resin molded article mixed and added.

[0007] Among the above-mentioned conventional colorants for pattern appearance,
Fine and short fibers with a fiber thickness of 50 denier or less and a fiber length of 1 mm or less can be used by dispersing them in a base material to be colored such as a synthetic resin. It can be colored in the style of a wind or flowing pattern, and has been awarded as a colorant that enhances the decorative value in a unique color tone.

[0008]

However, when the above-mentioned conventional colorants for pattern appearance are mixed with a dye or pigment as a base color, the surface of the fiber is colored with the dye or the fine particles of the pigment are used. May coat the surface of the colorant for pattern appearance such as fiber, and in this case, the colorant for pattern appearance becomes difficult to see clearly, and a clear pattern does not appear.

For example, carbon black is blended as a base color with a plastic material, and a colorant for pattern appearance such as white fibers, mica, and white film pieces is blended,
Attempts to form a flowing or speckled pattern will make the pattern unclear. Similarly, when a black dye or pigment such as carbon black is blended as a base color, and a color developing colorant such as brown, red or green is blended, the pattern becomes unclear.

Therefore, an object of the present invention is to solve the above-mentioned problems in the conventional colorants for pattern appearance, and to blend the colorants for pattern appearance into plastic materials colored with various base colors. It is an object of the present invention to provide a colorant for plastics in which a clear pattern appears without exception.

[0011]

In order to solve the above-mentioned problems, according to the present invention, there is provided a powder for a base color having a scale-like particle and a particle size of 0.03 to 0.074 mm (500 to 200 mesh). This is a plastic colorant comprising a mixture of a colorant and a fiber for pattern appearance. In addition, a solid colorant for plastics composed of a master batch in which the above colorant is mixed with a thermoplastic resin can also be used.

Further, in order to solve the above-mentioned problem, in the second invention of the present application, the particles are scaly and have a particle size of 0.03 to 0.074 mm (500 to 200 mesh).
And a colorant for plastics comprising a mixture of a powder colorant for a base color and a large pattern appearance flake having a scale-like particle size of 0.104 mm (150 mesh) or more. In addition, a solid colorant for plastics composed of a master batch in which the above colorant is mixed with a thermoplastic resin can also be used.

[0013] The colorant for plastics of the present invention has a predetermined particle size of flakes and a particle size of 0.03 to 0.07.
Although a special base color powder colorant of 4 mm, which is different from the conventional base color, is employed, this base color powder colorant efficiently colors the plastic base material depending on the scale shape.

Further, the base color powder colorant is
Larger particle size than conventional ultra-fine particle size (0.01 mm or less) dye / pigment, it is hard to aggregate, and adheres to the surface of pattern appearance colorant (fibrous or flake). It is difficult to coat the surface of the colorant for pattern appearance which is mixed and used in combination, that is, it is difficult to hide the color of the colorant for pattern appearance.

Therefore, the colorant for plastics of the present invention is a colorant for plastics which shows a clear pattern even if a colorant for pattern appearance is mixed with a plastic material colored with various colors of base colors.

In the case of using a scale-like pattern revealing colorant, a large particle having a particle size of 0.104 mm (ie, 150 mesh) or more is used. Similarly, a clear pattern appears.

Incidentally, the particle size in the present invention means, according to the measurement method, "the length or diameter of one side of a square or circular mesh of the smallest standard sieve through which a fluid or powder can pass is expressed in millimeters. Numerical value ".

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The powder colorant for a base color used in the present invention has a scale-like particle shape and a particle size of 0.1.
Inorganic or organic powders of 03-0.074 mm can be used.

The powder colorant for the base color is a powder which is originally flake-like due to the crystal structure or the like or is formed into a foil or film by spreadability or film workability (thin film formability). Examples of such a powder include the following inorganic powders. (1) Copper powder (Fukuda Metal Foil Industry Co., Ltd .: # 3L3, 200 mesh: particle size 0.074 mm) (2) Gold powder or brass powder (Fukuda Metal Foil Industry Co., Ltd .: # 4L)
5, 325 mesh: particle size 0.043 mm) (3) Aluminum powder (manufactured by Daiwa Metal Powder Co., Ltd .: # 900, 32)
5 mesh: particle size 0.043 mm) (4) Talc (Nippon Talc: 325 mesh: particle size 0.043 mm) (5) Iron black (Asahi Kasei Corporation: 200 mesh: particle size 0.0)
74 mm).

As the organic powder, thermosetting resin powder and heat-resistant thermoplastic resin (engineering plastic such as polyimide resin and polyaryl ether ketone resin) can also be used.

The particle size of the base color powder coloring agent described above is larger than 500 mesh, and the particle size is 0.03 to 0.074 mm (500 to 200 mesh). This is because a powder colorant for a base color composed of a powder having a particle size of less than 0.03 mm (maximum diameter of less than about 30 μm) has a small particle size, deteriorates the addition efficiency as a colorant, and has a fibrous or flake shape. This is because they tend to adhere to or agglomerate on the surface of the pattern appearance colorant, and have the property of hiding the color of the pattern appearance colorant. In addition, the particle size of the base color powder colorant is 0.1.
Large particles exceeding 074 mm are difficult to distinguish from flake-like colorants for pattern appearance with the naked eye, and the pattern becomes unclear, which is not preferable.

As the fiber for pattern appearance used in the present invention, any of inorganic fibers and organic fibers can be used, and specific examples thereof include cotton, silk, kabok, wool, flax, cannabis, lami, jute, coconut and the like. Natural fibers, synthetic fibers such as polyester, polyamide, polyacetal, polyurethane, polyethylene, polypropylene, polyvinyl chloride, acrylic, and aramid; semi-synthetic fibers such as acetate; regenerated fibers such as rayon and vinylon; and other organic fibers, or carbon fibers. Examples thereof include inorganic fibers such as metal fibers and glass fibers.

Of these, fibers such as rayon, vinylon, polyester, and acetate are drawn by stretching.
At first glance, it becomes a silky colorant with a great luster, and it can be used to give a pearl color. Further, by dyeing a yarn such as jute or using a matting yarn, it can be used as a colorant that exhibits a matte color tone.

Such a fiber for pattern appearance has a fiber diameter (diameter) of 5 to 100 μm and a fiber length of 0.1 to 100 μm.
It is preferable to use a 2 mm one. The reason for this is that, if the diameter and the length are smaller than the above-mentioned predetermined range, they cannot be colored in a point drawing style and become a single color, which is not preferable. This is because the fibers are arranged in parallel on the surface, so that it is unlikely to be a point drawing style.

In the case of rayon having a specific gravity of about 1.5, polyester having a specific gravity of 1.38, nylon having a specific gravity of about 1.14, the fiber diameter is 15 to 150 as a commonly used fiber thickness.
It is preferable to use denier (hereinafter abbreviated as d).

The following commercially available fibers can also be used as the above-described pattern-presenting fibers. (1) Rayon fiber colored product (manufactured by Towa Chemical Co., Ltd .: fiber diameter 15 ~)
(2) Carbon fiber (manufactured by Osaka Gas Co., Ltd .: fiber diameter 2 to 60 μm, fiber length 1 mm).

The flakes for pattern appearance used in the present invention are:
It is a large organic or inorganic pattern-exposing flake whose particles are scaly and have a particle size of 0.50 mm or more.

The material of the flakes for pattern appearance may be flake-like in nature due to the crystal structure or the like, or foil or film-like depending on the spreadability of metal or the like or the film workability (thin film formability) of resin or the like. It can be formed into For example, flakes of the following inorganic substances,
Large particles having a particle size of 0.104 mm (that is, 150 mesh) or more can be used. (1) Aluminum flakes (manufactured by Fukuda Metal Foil Industry Co., Ltd .: each color such as black, gold, silver, red, and blue, 25 to 50 mesh: particle size 0.7 to 0.28 mm) (2) Mica colored product (Towa Chemical) (3) Mica powder (manufactured by Mica Yamaguchi: 150 mesh: 0.104 mm particle size) (4) Graphite (Tokai Carbon Co., Ltd .: 150 mesh: 0.104 mm particle size) (5) Hill Stone (manufactured by Nippon Talc: 150 mesh: particle size 0.104 mm).

As the film material for cutting the synthetic resin film, commercially available films such as polyethylene terephthalate (PET) film, polyamide film, cellophane and the like can be mentioned.

In order to cut the above-mentioned film material into a predetermined particle size, a well-known cutting machine such as a guillotine type may be used, and a commercially available synthetic resin flake cut into a predetermined particle size (Nishigaki Shoten Co., Ltd.) Manufacture: various cellophane colored films, PET vapor-deposited color films, etc.) can also be employed.

The above-mentioned colorant, especially the powder colorant for the base color, should be surface-treated with an antistatic agent, a lubricant, a dispersant (an anti-settling agent in the case of a paint colorant), or the like. Is preferable for achieving the object of the present invention. When a plastic material is colored with the colorant of the present invention, a small amount of a dye or pigment generally used for color tone correction may be added.

[0032]

[Example 1] Copper powder (Fukuda Metal Foil Industry Co., Ltd .: # 3L3, 200 mesh: particle size: 0,0 mesh) as a base color.
A colorant comprising a mixture of 5% by weight of 074 mm) and 45% by weight of a black dyed rayon fiber (manufactured by Towa Chemical Co., Ltd .: fiber diameter 15d, fiber length 1 mm) as a pattern appearance fiber is used for coloring. A mixture obtained by kneading the agent and polyethylene resin by 50% by weight with a hot roll was formed into pellets.

3% by weight of a solid colorant composed of the obtained pellets was mixed with a polypropylene material for molding, and injection molding was carried out according to a standard method to produce a plate-like molded product.

When the pattern appeared on the surface of the obtained molded article was observed, a flow pattern of black fibers was clearly seen on the metallic (copper) base color in a dot-drawing style.

Example 2 5% by weight of aluminum powder (manufactured by Daiwa Metal Powder Co., Ltd .: # 900, 325 mesh: particle size 0.043 mm) as a base color, and mica tea-based colored flakes as pattern appearance flakes ( (Towa Chemical Co., Ltd .: particle size 1 mm)
A colorant consisting of a mixture of 45% by weight and a mixture of the colorant and 50% by weight of a polyethylene resin were kneaded with a hot roll to form pellets.

3% by weight of a solid colorant comprising the obtained pellets was blended with a polyethylene material for molding, and injection molding was performed according to a standard method to produce a plate-like molded product.

When the pattern appeared on the surface of the obtained molded article was observed, a brown spot pattern was clearly confirmed on the metallic (white) base color.

[0038]

[0039]

[0040]

Example 4 8% by weight of gold powder (# 4L5, 325 mesh, particle size 0.043 mm, manufactured by Fukuda Metal Foil Industry Co., Ltd.) was used as a base color, and a reddish aluminum foil was used as a flake for pattern appearance. 30% by weight of colored flakes (Towa Chemical Co., Ltd .: particle size 1 mm) and graphite (Tokai Carbon Co., Ltd .: 150 mesh: particle size 0.104 mm)
10% by weight as a colorant, and this colorant and 52% by weight of an ethylene-vinyl acetate copolymer were kneaded with a hot roll to form a pellet.

5% by weight of a solid colorant composed of the obtained pellets was blended with an ABS resin material for molding, and injection molding was performed according to a standard method to produce a plate-like molded product.

When the pattern appeared on the surface of the obtained molded article was observed, a red spot pattern was clearly confirmed on the base color in which gold and black were mixed.

[0044]

[0045]

[0046]

Example 6 As a base color, talc (manufactured by Nippon Talc: 325 mesh, particle size: 0.043 m)
m) 15% by weight, and as a flake for pattern appearance, a black colored product of mica (manufactured by Towa Chemical Co., Ltd .: particle size 2 m)
m) 20% by weight and mica powder (manufactured by Yamaguchi Mica Industries: 15
0 mesh: particle size 0.104 mm) and 15% by weight, and 2% by weight of titanium oxide (SR-1, 0.02 μm) and 48% by weight of an acrylic resin. What was blended and kneaded with a hot roll was formed into pellets.

5% by weight of a solid colorant comprising the obtained pellets was blended with a polyethylene material for molding, and injection molding was carried out according to a standard method to produce a plate-like molded product.

When the pattern appeared on the surface of the obtained molded article was observed, a black spot pattern was clearly confirmed on the white base color.

[0050]

As described above, the present invention employs a special base colorant having a scaly particle shape and a predetermined particle size, and combining this with a fibrous pattern appearance colorant or a predetermined colorant. Since it is a plastic colorant consisting of a mixture of a flake-shaped pattern appearance colorant in combination with a particle size, it is clear when the pattern appearance colorant is blended with a plastic material colored with various base colors. There is an advantage that it becomes a colorant for plastics in which a clear pattern such as a flowing pattern or a spot pattern of a natural fiber appears.

Claims (2)

(57) [Claims] Claims: 1. The particles are scaly and have a particle size of from 0.03 to 0.03.
A colorant for plastics comprising a mixture of a 0.074 mm base color powder colorant and a fiber for pattern appearance. 2. The particles are scaly and have a particle size of from 0.03 to 0.03.
A colorant for plastics comprising a mixture of a powder colorant for a base color of 0.074 mm and large pattern appearance flakes having a scale-like particle and a particle size of 0.104 mm or more.