JP2866049B2 - Method for producing resin colorant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a process for producing a resin colorant, known as a colorant masterbatch, for use in coloring thermoplastic resins.

[0002]

2. Description of the Related Art Thermoplastic resins have excellent processability, and by taking advantage of them, various molding methods such as extrusion molding such as press molding, injection molding, film, sheet, and profile extrusion, and hollow molding are used. Various plastic products are manufactured.

[0003] Dry color, granular color, master batch, liquid color, colored pellets, etc. are known as coloring materials for plastic products.
The selection is made in consideration of various factors such as the shape of the product, the demand, and the cost.

[0004] Dry color is obtained by mixing and pulverizing a dispersing aid such as metal soap or wax with a pigment or dye, and mixing the dry color and a target resin uniformly with a mixer such as a tumbler to obtain coloring. It is what you do. Dry color is widely used because it is the simplest coloring method and it is also advantageous in terms of cost.
There is a problem in the work environment due to dust generated during use and measurement.

[0005] The masterbatch is prepared by pre-dispersing pigments and dyes in a resin, and is free from dust, easy to change colors and has good weighing properties.

[0006] "Colorants and color compounds for plastics" published by Grace Laboratory (October 1990)
The masterbatch consists of a masterbatch-based resin and pigments, dyes and dispersing aids such as metal soaps and waxes, as described in
It is manufactured by kneading in a batch system using a roll, etc., manufactured continuously by kneading with a single-screw or twin-screw extruder, and manufactured by an apparatus that also has the function of a Banbury mixer such as an intensive mixer. It is produced by various methods such as things.

In the above methods such as a kneader, a Banbury mixer, and a roll, heat is applied to a masterbatch-based resin, a pigment, a dye, and a dispersing agent, followed by kneading, followed by cooling, followed by crusher, Henschel mixer, feather mill. A masterbatch is produced through a process such as powdering, flakes, square pellets using an atomizer, a chip cutter, etc., or pelletizing by further extruding the kneaded material.

Various methods have been conventionally proposed for producing a masterbatch. The main point is how to efficiently knead dyes and pigments during the production of the masterbatch, and mix the masterbatch with the resin used. The following two points are how to improve dispersibility and prevent color unevenness when used.

In order to enhance the kneading effect at the time of kneading, a technique using an ethylene-propylene copolymer (JP-A-56-1981)
20055), a technique using an ethylene-vinyl acetate copolymer (JP-A-59-6225), and a technique using a wax having a special structure (JP-A-63-8458).

Further, in order to improve the problem of color unevenness which occurs when using a masterbatch, a technique using a high-flowability masterbatch-based resin is disclosed (Japanese Patent Laid-Open No. 1-306429).
No.) and a technique of adding polyethylene glycol (JP-A-50-64344).

By the way, there is a reality that a masterbatch is more expensive than a dry color, and there is a strong demand for cost reduction. One way to reduce the cost of the masterbatch is to increase the concentration of pigments and dyes in the masterbatch, but there is a limit to the upper limit of the concentration of pigments and dyes. Since it depends on the composition of the masterbatch and the production method, it cannot be generally discussed, but the concentration of the conventional pigment is 30 wt.
0% by weight was common.

[0012] In the case of the above-mentioned method using a kneader, a Banbury mixer, a roll, or the like, it is relatively easy to increase the concentration of pigments and dyes, but depending on the method, there are restrictions on the blending surface and the production process becomes complicated. In addition, there is a problem that it takes time and effort to clean the apparatus at the time of changing colors, and it is not suitable for the production of a large number of products.

[0013] As a method corresponding to the production of master batches of a small amount and a large variety, continuous production by an extruder is the most preferable method. A method for continuously producing a masterbatch by kneading a masterbatch composition with a single-screw or twin-screw extruder has already been proposed in Japanese Patent Application Laid-Open No. 58-18827. This is a method for continuously producing a masterbatch with the prepared composition. When the amount of wax in the masterbatch is large, processability and dispersibility are improved, but problems such as bleed out of the wax deteriorating the appearance of the product and adversely affecting printability are caused.

[0014]

The present inventor has pursued such a problem and has been conducting research and development on how to improve the concentration of pigments and dyes in a masterbatch. In the process, if the masterbatch base resin does not exist in the masterbatch composition, the melt viscosity of the cord will be reduced during extrusion, and the cord can be cut only by hot cutting, which has been found to limit the equipment. Was.

That is, the inventor of the present invention aims to develop a method for producing a high-concentration masterbatch by a continuous production method using an extruder which is simple and cost-effective, and has eagerly sought a solution to the problem that occurs during the cutting. As a result of the study, it has been found that the state of dispersion of the pigment and dye is extremely important when mixing the pigment, dye and resin through an extruder, kneading, and pelletizing, thereby leading to the present invention.

In the production of a high-concentration masterbatch, a colorant component such as a pigment and a dye, a dispersing aid, a resin colorant composition comprising a masterbatch base resin and the like are mixed by a tumbler, and then the mixture is passed through an extruder and kneaded. Then, after extruding the cord from the die part, the cord can be pulled by shredding with the cutter part, but the cord cannot be cut, and the desired masterbatch / pellet cannot be produced.

When the proportion of the colorant component in the resin colorant composition is increased in order to increase the concentration of the pigment or dye in the masterbatch, the colorant component is increased even if the resin colorant composition is kneaded through an extruder. Cannot be uniformly dispersed, and as a result, there is a portion where the colorant component is not uniformly covered by the resin portion, and when the cord is torn, the cord becomes fibrillated, and the cord is finely divided by the cutter. Even if it is cut, it is presumed that it cannot be cut smoothly and the pellets are in a connected state.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to easily produce a resin colorant used as a high-concentration and high-quality masterbatch.

[0019]

According to the present invention, there is provided a resin colorant composition comprising a colorant, a dispersing aid, and a masterbatch base resin as essential components, and a stirrer for the resin colorant composition. mixture was poured into crushed, stirred, by producing softened molten resin colorant composition, a resin
Means of forming an intermediate product of the resin colorant in which the bulk (ml / g) of the colorant composition is reduced to 70% or less before stirring, kneading and pelletizing the intermediate product using an extruder . It was taken.

It is desirable that the ratio of the masterbatch base resin in the resin colorant composition is 5% by weight or more and 60% by weight or less.

As the coloring material, one or more selected from pigments, dyes, colored short fibers, carbon fibers, aluminum powder, and colored mica flakes are used.

As the dispersing aid, one or more selected from metal soaps, waxes and higher fatty acid amides are used. In this case, the weight average molecular weight of the wax ranges from 5,000 to 100,000. The ratio (% by weight) of the wax to the masterbatch base resin is 10:90 to 9
Desirably, the ratio is 0:10.

According to the invention, of course, 40% by weight,
The production of high-concentration masterbatches of 90-95% by weight is possible, rather than masterbatches, allowing products containing colorants in a concentration substantially in the dry color region.

The present inventor has also described a resin colorant composition comprising a colorant component such as a pigment and a dye, a dispersing aid, and a masterbatch base resin as described below and specifically exemplified in Examples. When kneading with an extruder, the difference between the bulk of the coloring material components such as pigments and dyes and the dispersing aid and the bulk of the master batch base resin is too large, and the familiarity between the coloring material components and the master batch base resin becomes poor. I found that it was the cause.

In order to solve this problem, when producing a high-concentration masterbatch, a coloring material, a dispersing aid and a masterbatch base resin are mixed together, and before the cord is drawn through an extruder, the coloring material, By mixing, pulverizing, and stirring the dispersing aid and the resin, the resin colorant composition is softened and melted to reduce the bulk. The "bulk" is m
It is an apparent specific volume represented by 1 / g. This improves the dispersion of the colorant and resin.After that, even if the cord is pulled through an extruder, it can be cut smoothly at the cutter, and the resulting high-concentration masterbatch also has good dispersibility. You will be able to enjoy the amazing effect of being superior.

The pigments and dyes used in the present invention may be selected from inorganic pigments according to the intended use, such as color tone, dispersibility, color development, heat resistance, weather resistance, solvent resistance, water resistance, migration resistance and hiding power. It can be arbitrarily selected from those usable for coloring the resin, such as organic pigments and dyes.

Specifically, monoazo, disazo, condensed azo, naphthol, anthraquinone, quinacridone, perylene, perinone, isoindolinone, phthalocyanine, dioxazine organic pigments and titanium oxide, Inorganic pigments such as titanium yellow, red iron oxide, ultramarine blue, chromium oxide, and molybdenum red; carbon black;

The colored short fibers usable as a coloring material are those obtained by coloring cotton, acetate, rayon, polyester, nylon, etc., and have a fiber diameter of 1 to 300 denier and a length of 0.1 to 5 mm. You can choose any of them.

Similarly, as the carbon fiber, a product produced from polyacrylonitrile or petroleum pitch through a firing step is preferably used.

Similarly, aluminum powder is used for imparting metallic luster to a product, and can be arbitrarily selected according to the purpose of use such as size and shape.

The colored mica flakes are used to impart a sesame spot pattern or a pearl pattern to a product. An inorganic coating such as titanium oxide is coated on muscovite and biotite. You can choose from products such as thinly coated ones as needed.

The dispersing agent used in the present invention is a compound selected from metal soap, synthetic wax, montan wax, and higher fatty acid amide. Any of the above substances can be used according to the purpose of use, as long as it has the purpose and effect of preventing reaggregation of the pigment and improving the wettability between the pigment and the masterbatch base resin to improve the dispersibility of the masterbatch. You can choose.

The metal soap that can be used as a dispersing aid is a metal salt of a higher fatty acid and has a melting point of preferably 165 ° C. or less. Specifically, zinc stearate, magnesium stearate, calcium stearate, and aluminum stearate are used. And zinc laurate.

Similarly, as the wax, a synthetic wax having a weight average molecular weight of 5,000 to 100,000 and a montan wax are preferably used. Specific examples include those having a structure of polyethylene, polypropylene, ethylene-vinyl acetate, ethylene-acrylic acid, ionomers, and derivatives thereof.

If the weight average molecular weight of the wax is lower than 5,000, when the cord is pulled by an extruder, the melt viscosity is low, causing cord dripping and making the production of a master batch difficult. Molecular weight 100,0
If it is higher than 00, the dispersion of the pigment becomes worse.

Similarly, as the higher fatty acid amide, stearic acid amide, palmitic acid amide, oleic acid amide, ethylenebisstearic acid amide and the like can be suitably used.

The mixing ratio of the wax and the masterbatch base resin used in the resin colorant composition of the present invention is appropriately determined according to the purpose of use, but the ratio of the wax to the wax in the masterbatch base resin (% by weight). Is preferably 90 or less. If the wax ratio is 90% by weight or more, cord dripping occurs.

The masterbatch base resin used in the present invention is a low-density polyethylene, a medium-density polyethylene, a high-density polyethylene, a linear low-density polyethylene,
4-methylpentene-1, polybutene-1, ethylene-
Vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, polypropylene, polystyrene, acrylonitrile-butadiene-styrene copolymer, polymethyl methacrylate, nylon-6, nylon-66, Polycarbonate, polyethylene terephthalate, polybutylene terephthalate,
It can be arbitrarily selected from thermoplastic resins such as polyacetal and polyphenylene ether.

The above resin may be one kind or a mixture of two or more kinds. Furthermore, polybutadiene rubber, ethylene-propylene rubber, styrene-
Rubber components such as butadiene copolymer rubber and styrene-isoprene block copolymer rubber may be mixed.

As the masterbatch base resin, polyolefins such as polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer and polypropylene give particularly favorable results.

The above-mentioned masterbatch base resin is desirably used in the form of a powder in consideration of the effects of the present invention.

The resin colorant composition of the present invention contains an antioxidant, an ultraviolet absorber, an antistatic agent, a surfactant, a flame retardant, a foaming agent, depending on the purpose of use, as long as the effects of the present invention are not impaired. Additives such as an agent, fillers such as talc, mica, barium sulfate, and calcium carbonate, and materials such as glass fiber, inorganic fiber, and metal fiber can be added.

The object of the present invention, colorant, dispersing aids, mixing a resin and a colorant composition comprising a master batch resin, milling, cause agitation to softening and melting, the bulk of the resin and a colorant composition (ml / g) to below 70% before stirring.

The apparent specific volume, that is, the bulk, of the resin colorant composition in the present invention is measured by a standing method specified in JIS K-5101. In mixing and stirring the resin colorant composition, pulverization and mixing are performed simultaneously. In the above-mentioned mixing, pulverization, and stirring, a part of the resin colorant composition is softened, and the pigment, dye, and resin are uniformly pre-dispersed by the processing involving pulverization, surface treatment, and mixing, whereby the resin colorant composition The bulk of the material becomes smaller, and very uniform kneading becomes possible in the subsequent granulation process.

The treatment often results in the resin colorant composition becoming granular. The stirrer used for the mixing, grinding and stirring is not particularly limited as long as the bulk (ml / g) of the resin colorant composition can be reduced to 70% or less of that before stirring.

For this purpose, it is effective to use a stirrer having a stirring blade and capable of operating at several hundred to 2,000 revolutions per minute, which applies a strong shearing force to the object to be stirred during stirring. Is expressed. For example, a high-speed mixer such as a Henschel mixer or a super mixer with a trade name is suitably used.

In the mixing, pulverizing and stirring, it is essential to have a strong action such that the bulk of the resin colorant composition drops to 70% or less of that before stirring. However, no effect is exhibited by simple mixing using a tumble mixer or the like.

In the present invention, it is essential to mix, pulverize, and stir a resin colorant composition comprising a colorant, a dispersing aid, and a masterbatch base resin.
The effect is not exhibited unless the masterbatch base resin is present during the stirring process. The coloring material of claim 1, a dispersing aid,
The requirement of forming the resin colorant composition using the masterbatch base resin as an essential component means the above.

That is, after removing the masterbatch base resin, mixing, pulverizing and stirring to obtain a resin colorant composition having a reduced bulk, before kneading with an extruder, the resin colorant composition is mixed with the masterbatch. The effect of the present invention does not occur even if it is simply mixed, pulverized, and stirred with the base resin using a tumble mixer or the like.

The stirring conditions such as the number of revolutions and the jacket temperature when mixing, pulverizing, and stirring using a Henschel mixer, a super mixer, etc. are determined by the composition of the resin colorant composition. When heating the jacket, the stirring device may be heated in advance, or frictional heat generated by stirring may be used.

In the present invention, the state where the bulk is reduced to 70% or less before stirring is referred to as an intermediate product of the resin colorant. The intermediate product is further kneaded using an extruder and finally becomes a resin colorant. The appearance of the intermediate product to the outside differs depending on the transport mode. For example, in the case of the batch type, it is once taken out of the stirrer, but in the case of the continuous type, it is put into an extruder as it is, so there is no chance to see it directly. However, in any case, 70% before stirring
The following intermediate product state is still present.

The intermediate product of the resin colorant is introduced into an extruder and kneaded in the extruder. The extruder used in the present invention is not particularly limited as long as the resin can be kneaded and extruded after charging the resin from a hopper port or the like, and an ordinary extruder having a feed / compression / metering function can be used. .

The type of the extruder may be either a single-screw extruder or a multi-screw extruder incorporating two or more screws.
It can be freely selected as appropriate according to the purpose. The operating conditions of the extruder, such as the cylinder temperature and the number of rotations of the screw, are appropriately determined according to the purpose of use.

When the resin colorant of the present invention is mixed with a diluent resin to produce a product by injection molding or the like, it is necessary that the resin colorant and the diluent resin be uniformly mixed. Care must be taken not to increase the melt viscosity difference of the resin.

The melt viscosity (flowability) of the resin colorant can be freely determined by the amount of the colorant, the flowability of the masterbatch base resin, the amount of the dispersing aid, and the mixing ratio of the dispersing aid / masterbatch resin. Can be changed in a wide range.

[0056]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically illustrated by way of examples, but the present invention is not limited to these examples.

Example 1 3400 parts of titanium oxide, 70 parts of red iron oxide, 70 parts of carbon black, and 710 parts of calcium stearate
, A resin colorant composition comprising 600 parts of a linear low density polyethylene powder having a melt index of 2.0 g / 10 minutes and 150 parts of a polyethylene wax having a weight average molecular weight of 35,000 (proportion of masterbatch base resin = 12.0 %) Into a 100 liter super mixer manufactured by Kawada Manufacturing Co., Ltd.
The mixture was mixed, crushed, and stirred for 10 minutes by rotation and 1 minute by 675 rotations to obtain 30 kg of an intermediate product of the resin colorant. The bulk of the resin colorant intermediate was 56% before stirring.

Next, the intermediate product of the above resin colorant was put into a hopper of a 50 mm extruder manufactured by Ikegai Iron Works, Ltd.
The cord was extruded at a cylinder temperature of 150 ° C. and a rotation speed of 150 times / minute, and cut with a rotary blade to obtain a pellet-shaped resin colorant.

Two parts of the resin colorant pellets were mixed with 100 parts of a linear low-density polyethylene having a melt index of 8.0 g / 10 min, and injection-molded using a 1-oz injection molding machine manufactured by Yamashiro Seiki.

A good molded product without color unevenness was obtained.

Comparative Example 1 Using the resin colorant composition of Example 1, the supermixer was stirred at 675 rpm for 4 minutes and at 1350 rpm for 5 minutes.
Min, 675 rotations and 1 minute, except that mixing, crushing, and stirring were performed with a super mixer in the same manner as in Example 1,
The volume of the intermediate product of the resin colorant is reduced to 80% before stirring,
According to the method of Example 1, kneading was performed with an extruder.

Although the cord could be pulled, cutting could not be performed at the cutting portion, and only the pellets were connected.

Comparative Example 2 In the method of Example 1, the steps of mixing, pulverizing, and stirring with a super mixer to produce an intermediate product of the resin colorant were omitted, and the pigment, dispersing aid, and masterbatch base of Example 1 were omitted. The resin was placed in a tumble mixer, mixed and stirred at 100 revolutions per minute for 3 minutes, and then charged into the hopper of a 50 mm granulation extruder manufactured by Ikegai Iron Works, and kneaded and pelletized under the same conditions as in Example 1. Was.

Although the cord could be pulled in the same manner as in Example 1, cutting could not be performed at the cutting portion, and only pellets connected to each other could be obtained.

Comparative Example 3 A resin colorant composition was prepared in the same manner as in Example 1 except that the linear low-density polyethylene powder was removed from the composition in Example 1, and the mixture was subjected to a supermixer at 675 rpm for 4 minutes, 1350 minutes. Mixing and stirring were performed under the conditions of rotation for 15 minutes and 675 rotations for 1 minute.

Next, 10 kg of a mixture comprising 550 parts of a linear low-density polyethylene powder having a Melton index of 2.0 g / 10 min and 4000 parts of the above-mentioned agitated material was placed in a tumble mixer, and mixed at 100 rpm for 3 minutes.
After stirring, the mixture was put into a hopper of a 50 mm granulation extruder manufactured by Ikegai Iron Works, and kneaded and pelletized under the same conditions as in Example 1.

Although the cord could be pulled in the same manner as in Example 1, cutting could not be carried out at the cutting portion, and only pellets connected to each other could be obtained. Table 1 shows the contents of Example 1 and Comparative Examples 1 to 3.

[0068]

[Table 1] Example 2 In preparing a resin colorant composition, a random copolymer type polypropylene powder having a melt index of 4.0 g / 10 minutes was used instead of a linear low density polyethylene powder as a masterbatch base, and a super mixer was used for stirring time. Was pelletized under the same conditions as in Example 1 except that the rotation time was changed to 675 rpm for 3 minutes, 1350 rotations for 15 minutes, and 675 rotations for 1 minute to obtain pellets of the intermediate product of the resin colorant.

The bulk of the intermediate product of the resin colorant was 58% before stirring.

2 parts of the resin colorant pellets were mixed with 100 parts of a block copolymer type polypropylene having a melt index of 10.0 g / 10 minutes, and injection molding was carried out in the same manner as in Example 1. Not a good product was obtained.

Comparative Example 4 A resin colorant composition comprising the same colorant, dispersion aid and masterbatch base resin as in Example 2 was kneaded under the same conditions as in Comparative Example 2 except that the cylinder temperature was changed to 170 ° C. However, cutting could not be performed at the cutting portion, and only pellets connected to each other could be obtained. Table 2 shows the details of Example 2 and Comparative Example 4.

[0072]

[Table 2] Example 3 2100 parts of titanium oxide, 50 parts of bengalara, 50 parts of carbon black and 450 parts of calcium stearate
Parts, a resin colorant composition comprising 2000 parts of a linear low density polyethylene powder having a melt index of 2.0 g / 10 minutes and 350 parts of a polyethylene wax having a weight average molecular weight of 35,000, and a master batch base resin ratio of 40%. When the intermediate product was prepared and pelletized under the same conditions as in Example 1 except that the cutting was performed, cutting at the cutting portion could be performed without any problem, and pellets of the desired resin colorant could be obtained. The bulk of the intermediate product of this resin colorant was 65% before stirring.

When the resin colorant was injection-molded according to Example 1, a good molded product without color unevenness was obtained.

Comparative Example 5 A mixture of a coloring material, a dispersing aid, and a masterbatch base resin having the same composition as in Example 3 was granulated in the same manner as in Comparative Example 2, but the cutting portion could not be cut, and the pellets were not separated. I only got what was connected.

Comparative Example 6 1200 parts of titanium oxide, 25 parts of bengara, 25 parts of carbon black, and 250 parts of calcium stearate
Parts, a linear low density polyethylene powder having a melt index of 2.0 g / 10 min, and a resin colorant composition consisting of 3500 parts. The ratio of the masterbatch base resin of the resin colorant composition of Example 1 was made 70.0%. Comparative Example 2
Kneading and pelletizing were performed under the same conditions as described above.

The cutting can be performed without any problem.
Masterbatch pellets could be obtained.

When the resin coloring material was injection-molded according to Example 1, a good molded product without color unevenness was obtained. Table 3 shows the details of Example 3 and Comparative Examples 5 and 6.

[0078]

[Table 3] Comparative Example 7 3300 parts of titanium oxide, 70 parts of bengara, 70 parts of carbon black, 660 parts of calcium stearate and 300 parts of polyethylene wax having a weight average molecular weight of 1000,
Example 1 except that 600 parts of a linear low density polyethylene powder having a melt index of 2.0 g / 10 min was used.
The production was carried out under the same conditions as in Example 1, but the cord pellets occurred and the desired pellets could not be obtained. The bulk of the intermediate product of this resin colorant was 54% before stirring.

Comparative Example 8 2400 parts of titanium-resistant, 50 parts of bengalara, 50 parts of carbon black, 500 parts of calcium stearate and polyethylene wax 1900 having a weight average molecular weight of 35,000
Parts and the melt index was 2.0 g / 10 min., And the amount of the linear low-density polyethylene powder was changed to 100 parts under the same conditions as in Example 1. The bulk of the intermediate product of this resin colorant was 50% before stirring.

The cord was dripped, and pellets of the master batch could not be obtained. Table 4 shows the contents of implementation of Comparative Examples 7 and 8.

[0081]

[Table 4] Example 4 830 parts of titanium oxide, fiber diameter 15 denier, length 0.
A resin colorant composition comprising 400 parts of 5 mm black short fibers, 170 parts of calcium stearate, 480 parts of a linear low density polyethylene powder having a melt index of 2.0 g / 10 min, and 120 parts of polyethylene wax having a weight average molecular weight of 35,000. (Ratio of masterbatch base resin = 24%) was mixed and crushed in the same manner as in Example 1.
The mixture was stirred to obtain 30 kg of an intermediate product of the resin colorant.

The bulk of the intermediate product of the resin colorant was 55% before stirring.

Next, when pelletization was performed under the same conditions as in Example 1, cutting at the cutting portion could be performed without any problem, and pellets of the desired resin colorant could be obtained.
Two parts of the resin colorant pellets were mixed with a linear low density polyethylene 100 having a melt index of 8.0 g / 10 min.
And injection molded with a 1 oz. Injection molding machine manufactured by Yamashiro Seiki. A good molded product without color unevenness was obtained. Table 5 shows the details of the fourth embodiment.

[0084]

[Table 5]

Continuation of the front page (56) References Japanese Translation of PCT International Publication No. 5-505635 (JP, A) JP-A-61-246236 (JP, A) JP-A-59-135229 (JP, A) JP-A-58-167624 (JP) , A) (58) Field surveyed (Int.Cl. ⁶ , DB name) C08J 3/20-3/22

Claims (7)

(57) [Claims] 1. A resin colorant composition is formed by using a colorant, a dispersing aid, and a masterbatch base resin as essential components. The composition is charged into a stirrer, mixed, pulverized, and stirred to form a resin colorant composition. By causing the material to soften and melt,
The volume (ml / g) of the resin colorant composition is 70% before stirring.
A method for producing a resin colorant, comprising: forming an intermediate product of a resin colorant, which is reduced below, kneading the intermediate product using an extruder , and pelletizing the intermediate product. Method. 2. The method for producing a resin colorant according to claim 1, wherein the proportion of the masterbatch base resin in the resin colorant composition is 5 to 60% by weight. 3. The resin according to claim 1, wherein the coloring material is one or more selected from pigments, dyes, colored short fibers, carbon fibers, aluminum powder, and colored mica flakes. Method for producing colorant. 4. The method for producing a resin colorant according to claim 1, wherein the dispersing aid comprises one or more selected from metal soaps, waxes and higher fatty acid amides. 5. The weight average molecular weight of the wax is 5,000
The method for producing a resin colorant according to claim 4, wherein the amount is from 0 to 100,000. 6. The ratio of the wax selected as the dispersing aid to the masterbatch base resin (% by weight) is 10:90.
The method for producing a resin colorant according to claim 1, wherein the ratio is from 90 to 90:10. 7. The resin colorant according to claim 1, wherein the stirrer is operable at several hundred to 2,000 revolutions per minute and uses a high-speed mixer capable of applying a strong shearing force to an object to be stirred. Production method.