JP2003183447A - Colored resin composition and its molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a colored resin composition which enables high-speed spinning and film molding requiring a high degree of pigment dispersibility in the molding step of a colored molded article of a thermoplastic resin and can provide a colored resin molded article having good quality with no bleedout and no recognition of the deterioration of mechanical properties even compared to a noncolored resin molded article. <P>SOLUTION: The colored resin composition comprises a dispersing agent and a pigment or a dispersing agent, a pigment, and a thermoplastic resin, and the dispersing agent is a polyolefin wax synthesized by a metallocene catalyst, particularly a polypropylene wax, and a colored molded article can be obtained by using this composition. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a colored resin composition used for coloring a molded article of a thermoplastic resin, and a colored resin molded article obtained by using the colored resin composition.

[0002]

2. Description of the Related Art Conventionally, a colored resin composition used for coloring a molded article of a thermoplastic resin or for producing a colored resin molded article has a powdery form in which a pigment and a dispersant are mixed. Dry color, liquid color or paste color in which a pigment is dispersed in a liquid dispersant at room temperature, pellet-shaped, flake-shaped or bead-shaped colored pellets in which a pigment is dispersed in a resin that is solid at room temperature (also called a colored compound ) Or a masterbatch is used. Further, a base color in which a single pigment is dispersed in a dispersant, a resin, or a mixture thereof is used in producing these colored resin compositions. A desired colored resin composition can be prepared by mixing these respective base colors. Here, the masterbatch is similar to the colored pellets in that the pigment is dispersed in a resin that is solid at room temperature, but the colored pellets are directly subjected to molding, whereas the masterbatch is a colored pellet. However, the pigment is contained in a high concentration as compared with the above, and it is different in that it is used for molding after being diluted with an appropriate thermoplastic resin (diluting resin or resin to be colored).

[0003] These colored resin compositions are properly used depending on the application, but among them, master batches are preferably used from the viewpoints of easy handling and preservation of working environment during use. In addition to high pigment concentration as a performance required for masterbatch, little influence on various physical properties such as heat resistance and strength of the thermoplastic resin to be colored, in addition to improving precision and speed of molded products. Along with this, there is a demand for higher pigment dispersibility than ever before.

As a dispersant for imparting pigment dispersibility of the masterbatch, stearic acid; metal soaps such as zinc stearate, magnesium stearate, aluminum stearate, calcium stearate; ethylene bisamide; polyethylene wax, polypropylene wax Hydrocarbon waxes such as; and their derivatives, such as waxes composed of acid-modified and hydroxyl-modified products, are generally used.

[0005]

However, high-speed spinning or film formation with a diameter of a few tenths of a micron, etc.
In the case of molded articles that require a high degree of pigment dispersion, the above-mentioned dispersants did not provide a satisfactory dispersing effect or compatibility with the resin to be colored.

[0006] For example, a general-purpose polypropylene wax obtained by a conventional Ziegler catalyst has good compatibility with polypropylene, but has a too high dropping point and poor processability, and it is difficult to disperse the pigment in the three-roll process, and therefore, it is used for general purpose. Polyethylene wax was used. However, general-purpose polyethylene wax has poor compatibility with polypropylene,
Low dispersibility. Therefore, even if a colored resin composition is prepared with such a composition and a molded product is prepared using this, bleed-out and deterioration of mechanical properties are recognized, and the problem is particularly remarkable in high-speed spinning and film molded products. Met.

The present invention is a colored resin composition having excellent pigment dispersibility, and when this is used as a masterbatch, mechanical properties such as tensile strength, flexural modulus, impact strength, etc. It is an object of the present invention to provide a colored resin composition that does not give a physical property inhibition of 5% or more with respect to a strength value, and a colored resin molded article obtained by using the same colored resin composition.

[0008]

In order to achieve the above object, a colored resin composition according to the present invention comprises a colored resin composition containing a dispersant and a pigment, or a dispersant, a pigment and a thermoplastic resin. A colored resin composition containing the dispersant, characterized in that the dispersant is a metallocene-based polyolefin wax, especially a polypropylene wax.

Here, the metallocene-based polyolefin wax is a general term for polyolefin waxes obtained by synthesizing a single-site catalyst, metallocene, as a polymerization catalyst. The characteristic of this wax is that compared to the case of using conventional Ziegler catalyst, Ziegler-Natta catalyst, etc.
The highly monodisperse molecular weight distribution is narrow. Furthermore, compared to a general-purpose wax composed of the same monomer polymerized with a nonmetallocene catalyst in terms of both density and dropping point,
A significantly low product can be designed, and there is a possibility of selecting a wide range of processing conditions and machines.

Further, since the metallocene type polyolefin wax has a characteristic that it has good compatibility with other resins (polyolefins), the colored resin composition of the present invention has general versatility as a base color of a masterbatch or a masterbatch. Thus, it is possible to provide a molded product having a wide range of application and having excellent mechanical properties by being uniformly mixed with the resin to be colored. Among them, the metallocene-based polypropylene wax has high compatibility with other resins. The reason is that the metallocene-based polypropylene wax has low crystallinity, and even a small number of crystals are uniform and fine. It is thought that this is because it does not hinder the crystal growth of.

By using such a dispersant in the colored resin composition, the inventors can select a processing method suitable for the application from a wide range of processing methods and can disperse the pigment uniformly, and as a result, It has been found that a molded product having excellent mechanical strength can be provided without causing problems such as film breakage due to poor dispersion of pigments or poor compatibility.

In the present invention, as the metallocene-based polyolefin wax, a metallocene-based polypropylene wax can be particularly preferably used in consideration of the compatibility with the polypropylene resin. The metallocene-based polypropylene wax preferably has a dropping point of 60 to 140 ° C and a density of 0.87 to 0.91 g / cm ³ .
The dropping point in the present invention refers to the temperature when the first droplet drops from the semisolid to liquid state in the method according to JIS K2220.

The colored resin molded product according to the present invention is characterized by using the colored resin composition of the present invention. Since the colored resin composition of the present invention has excellent pigment dispersibility and good compatibility with the resin to be colored, it can be used to produce a colored resin molded product having excellent mechanical strength and high dispersibility. The colored resin composition according to the present invention is preferably used as a masterbatch or a colored pellet for a colored resin molded article, and can also be used for applications such as inks, paints and adhesives.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. As the dispersant used in the colored resin composition of the present invention containing a dispersant and a pigment or a dispersant, a pigment and a thermoplastic resin, a metallocene-based polyolefin wax polymerized by a metallocene compound catalyst is used.

The metallocene compound is, for example, titanium,
It is a generic term for compounds in which at least one ligand having a cyclopentadienyl skeleton is coordinated with a tetravalent transition metal such as zirconium, nickel, palladium, hafnium, niobium, and platinum. Examples of the ligand having a cyclopentadienyl skeleton include a cyclopentadienyl group; a methylcyclopentadienyl group, an ethylcyclopentadienyl group, n- or i-propylcyclopentadienyl group, n-, i-, sec -, Tert-butylcyclopentadienyl group, hexylcyclopentadienyl group, alkyl-substituted cyclopentadienyl group such as octylcyclopentadienyl group; dimethylcyclopentadienyl group, methylethylcyclopentadienyl group, Alkyl disubstituted cyclopentadienyl groups such as methylpropylcyclopentadienyl group, methylbutylcyclopentadienyl group, methylhexylcyclopentadienyl group, ethylbutylcyclopentadienyl group, ethylhexylcyclopentadienyl group; trimethyl Cyclopentadier Group, tetramethylcyclopentadienyl group, pentamethylcyclopentadienyl group and other alkyl polysubstituted cyclopentadienyl groups; methylcyclohexylcyclopentadienyl group and other cycloalkyl-substituted cyclopentadienyl groups; indenyl group, Examples include 4,5,6,7-tetrahydroindenyl group and fluorenyl group.

As the ligand other than the ligand having a cyclopentadienyl skeleton, for example, a monovalent anion ligand such as a base or bromine, a divalent anion chelate ligand, a hydrocarbon group, an alkoxide, an amide, an arylamide, an aryloxide. , Phosphides, arylphosphides, silyl groups, and substituted silyl groups. Examples of the hydrocarbon group include those having about 1 to 12 carbon atoms, and examples thereof include methyl group, ethyl group, propyl group, butyl group, isobutyl group, amyl group, isoamyl group, hexyl group, hebutyl group, octyl group. , Nonyl group, decyl group,
Examples include alkyl groups such as ceryl group and 2-ethylhexyl group; cycloalkyl groups such as cyclohexyl group and cyclopentyl group; aryl groups such as phenyl group and tolyl group; aralkyl groups such as benzyl group and neofil group; nonylphenyl group and the like. .

Specific examples of the metallocene compound coordinated with a ligand having a cyclopentadienyl skeleton include:
Cyclopentadienyl titanium tris (dimethylamide), methylcyclopentadienyl titanium tris (dimethylamide), bis (cyclopentadienyl) titanium dichloride, dimethylsilyltetramethylcyclopentadienyl-tert-butylamide zirconium dichloride, dimethyl Silyltetramethylcyclopentadienyl-pn-butylphenylamide zirconium dichloride, methylphenylsilyltetramethylcyclopentadienyl-tert-butylamide hafnium dichloride, dimethylsilyltetramethylcyclopentadienyl-tert-butylamide hafnium dichloride , Indenyl titanium tris (dimethylamide),
Indenyl titanium tris (diethyl amide), indenyl titanium bis (di-n-butyl amide), indenyl titanium bis (di-n-propyl amide) and the like can be mentioned.

Such a metallocene compound can be used as a cocatalyst, for example, as a catalyst system to which methylaluminoxane, a boron compound or the like is added. In this case, the ratio of the cocatalyst to the metallocene compound is 1
It is preferably ˜1,000,000 mol times.

As the polyolefin wax, a low molecular weight wax having a weight average molecular weight of 1,000 to 30,000 is preferable, and among them, polypropylene wax is particularly preferable because it has a high compatibility with a resin to be colored, particularly an olefin.
Examples include polypropylene, copolymers of ethylene and propylene (random or block copolymers), and waxes such as copolymers of propylene and α-olefins (excluding ethylene or propylene). Alternatively, it may be a wax obtained by thermal decomposition of these polymers. Examples of the α-olefin include 1-butene and 1
-Pentene, 1-hexene, 1-heptene, 1-octene, 4-methyl-1-pentene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and the like can be mentioned. Among these α-olefins, 1-butene and 1-hexene are preferable as the α-olefin to be copolymerized with propylene.

The dropping point of the polyolefin wax is 60 ° C.
As described above, the temperature is preferably 140 ° C. or lower. Further, the dropping point is more preferably 80 to 120 ° C. When the dropping point is higher than the specified value, the dispersion processing machine that can be used is limited, and for example, processing by ROLL becomes difficult and cannot be used. If the dropping point is too low, it may become sticky at room temperature, resulting in poor operability. The density of the wax is preferably 0.91 g / cm ³ or less from the viewpoint of the above-mentioned dropping point and the like, and is 0.8 from the viewpoint of pigment filling.
More preferably, it is from 75 to 0.905 g / cm ³ .

In another preferred embodiment,
Using a rotational viscometer according to JIS K 7117-2, the measured viscosity value at 170 ° C. is 1 to 2000 mP.
The wax in the range of a · s, and further in the range of 5 to 1900 mPa · s is selected. If the viscosity is less than 1 mPa · s, handling such as workability may be difficult. on the other hand,
When the viscosity exceeds 2000 mPa · s, wetting with a pigment or the like may be deteriorated, and the desired dispersibility and mechanical properties may not be obtained.

The dispersant is 1 to 90% by weight when the colored resin composition is a base color and 0.1 when a masterbatch is used.
A blending ratio of ˜50% by weight, and 0.1 to 10% by weight in the case of colored pellets is preferable.

As the pigment, one or more known organic pigments and inorganic pigments that have been conventionally used for coloring printing inks, paints, or thermoplastic resins can be used, and are not particularly limited. As the organic pigment, azo pigments such as azo lake, Hansa type, benzimidazolone type, diarylide type, pyrazolone type, yellow type, red type; phthalocyanine type, quinacridone type, perylene type, perinone type, dioxazine type, anthraquinone type,
Examples thereof include isoindolinone-based polycyclic pigments and aniline black. As the inorganic pigment, titanium oxide, titanium yellow, iron oxide, ultramarine blue, cobalt blue, chromium oxide green, yellow lead, cadmium yellow,
Inorganic pigments such as cadmium red and carbon black pigments can be mentioned.

The colored resin composition according to the present invention contains at least the above-mentioned dispersant and pigment, or a dispersant, a pigment and a thermoplastic resin. Can be used as a masterbatch diluted with, or as a colored pellet having a relatively low pigment concentration and directly subjected to molding without being diluted with a resin to be colored.

For example, when the colored resin composition is used as a base color, the pigment has a desired dispersibility,
From the viewpoint of coloring power and economical efficiency, it is preferable to contain 0.1% by weight or more, and from the viewpoint of pigment dispersibility, etc., 90% by weight.
The content is preferably the following, and particularly preferably 10 to 80% by weight. When this colored resin composition is used as a masterbatch, the pigment is preferably contained in an amount of 0.01% by weight or more from the viewpoint of economically obtaining the desired hue and coloring power. It is preferable that the content is 80% by weight or less in view of problems such as dispersibility in water.

When used as a colored pellet, the pigment is preferably contained in an amount of 0.001% by weight or more from the viewpoint of securing the desired coloring power, hue and the like. In addition, from the viewpoint of the appearance of the molded product (there is no spots associated with pigment aggregation), its content is preferably 40% by weight or less.

The thermoplastic resin used in the colored resin composition of the present invention is not particularly limited, but a polyolefin resin is preferable, and a polypropylene resin is particularly preferable.

The colored resin composition may further contain other additives such as wax, antioxidant, ultraviolet absorber and surfactant, if necessary, within a range that does not impair the effects of the present invention. Good. The colored resin composition described above can be produced by using an ordinary kneader or extruder. The design and operating conditions of each device are also not particularly limited.

Next, the colored resin molded product according to the present invention is molded by any method using the colored resin composition of the present invention. As a molding method, extrusion molding and injection molding are preferable. The resin to be mixed with the masterbatch at the time of molding is a resin having good compatibility with the thermoplastic resin used in the colored resin composition (polyolefin resin, etc.)
Is preferable and can be arbitrarily selected. Further, the colored resin composition of the present invention can be mixed with a resin to be colored containing an anti-blocking agent such as an inorganic filler or glass fiber or a reinforcing agent for the purpose of improving physical properties.

When the colored resin composition of the present invention is subjected to extrusion molding, particularly extrusion molding of a thin-walled product such as a film, it is possible to efficiently obtain a film excellent in pigment dispersibility and excellent in surface condition without scoring. You can Further, when the colored resin composition of the present invention is subjected to injection molding, a molded product having excellent pigment dispersibility and free from color unevenness and flow marks can be obtained.

[0031]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples without departing from the technical idea of the present invention. Less than,
"Parts by weight" is simply referred to as "parts" and "% by weight" is simply referred to as "%". Incidentally, the dropping point is a measured value of the temperature when the sample drops from a semi-solid state to a liquid state and its first drop falls in accordance with JIS K2220, and the viscosity is JIS K 7117-2.
It is a value (under 170 ° C.) measured by using a rotational viscometer according to the above.

1. Production of Base Color, Masterbatch or Colored Pellets (Example 1) Metallocene-based polypropylene wax as a dispersant (dropping point: 90 ° C., density: 0.88 g / cm ³ ,
Viscosity: 200 mPa · s) 50% and phthalocyanine blue “Rionol Blue FG7330” (manufactured by Toyo Ink Mfg. Co., Ltd.) 50% were dispersed and kneaded with a three-roll (3ROLL) to obtain a base color.

Example 2 Metallocene polypropylene wax as a dispersant (dropping point: 90 ° C., density: 0.90)
A base color was obtained in the same manner as in Example 1 except that g / cm ³ and viscosity; 1800 mPa · s) 50% were used.

Example 3 A metallocene polypropylene wax as a dispersant (drop point; 112 ° C., density; 0.8)
A base color was obtained in the same manner as in Example 1 except that 8 g / cm ³ , viscosity; 50 mPa · s) 50% was used.

(Comparative Example 1) Polypropylene wax "L"
icowax PP230 "(manufactured by Clariant, dropping point: 164 ° C., density: 0.90 g / cm ³ , viscosity: 17
(00 mPa · s) was used in the same manner as in Example 1 except that 50% was used to obtain a base color.

(Comparative Example 2) Polypropylene wax "L"
A base color was obtained in the same manner as in Example 1 except that 50% of "icowax VP PP220" (manufactured by Clariant Co., dropping point: 160 ° C, density: 0.88 g / cm ³ , viscosity: 800 mPa · s) was used.

Example 4 20% of the same metallocene polypropylene wax as in Example 1 as a dispersant, 20% of phthalocyanine blue "Rionol Blue FG7330" (manufactured by Toyo Ink Mfg. Co.) and polypropylene resin ("Grand Polypro F327BV"). Made by Grand Poly Pro,
Melting point: 130 ° C, MFR: 7) 60% using a twin-screw extruder with a screw diameter of 40 mm, melting and kneading at a set temperature of 180 ° C, while vacuum degassing smoothly without strand breakage or pulsation A masterbatch was obtained.

Example 5 A masterbatch was smoothly obtained in the same manner as in Example 4 except that the same metallocene polypropylene wax as in Example 2 was used as the dispersant in an amount of 20%.

Example 6 A masterbatch was smoothly obtained in the same manner as in Example 4 except that 20% of the same metallocene polypropylene wax as in Example 3 was used as a dispersant.

(Comparative Example 3) A masterbatch was obtained in the same manner as in Example 4 except that 20% of the polypropylene wax of Comparative Example 1 was used as the dispersant.

(Comparative Example 4) A masterbatch was obtained in the same manner as in Example 4 except that 20% of the polypropylene wax of Comparative Example 2 was used as the dispersant.

(Example 7) The same metallocene polypropylene wax as in Example 1 was used as a dispersant and 2%, and pigment phthalocyanine blue "Rionol Blue FG7330" was used.
(Toyo Ink Manufacturing Co., Ltd.) 1.5%, polypropylene resin (“Grand Polypro F327P” Grand Polypro Co., melting point; 130 ° C., MFR; 7) 96.5%,
The mixture was stirred and mixed using a Henschel mixer, and this was melt-kneaded using a twin-screw extruder having a screw diameter of 40 mm to obtain colored pellets smoothly.

(Example 8) Colored pellets were smoothly obtained in the same manner as in Example 7 except that 2% of the same metallocene polypropylene wax as in Example 2 was used as a dispersant.

Example 9 Colored pellets were smoothly obtained in the same manner as in Example 7 except that the same metallocene polypropylene wax as in Example 3 was used as the dispersant in an amount of 2%.

(Comparative Example 5) Colored pellets were obtained in the same manner as in Example 7 except that 2% of the polypropylene wax of Comparative Example 1 was used as the dispersant.

Comparative Example 6 Colored pellets were obtained in the same manner as in Example 7 except that 2% of the polypropylene wax of Comparative Example 2 was used as the dispersant.

(Example 10) 50% of the metallocene polypropylene wax used in Example 2 and 50% of phthalocyanine blue were stirred and mixed, and melt-kneaded at a set temperature of 100 ° C with a twin screw extruder having a screw diameter of 40 mm to obtain a base color. Pellets were obtained.

Comparative Example 7 A set temperature of 170 was obtained in the same manner as in Example 10 except that the mixture of polypropylene wax 50% and phthalocyanine blue 50% used in Comparative Example 1 was used (the composition is the same as that of Comparative Example 1). Base color pellets were obtained at ° C.

2. Evaluation Test of Base Color, Masterbatch or Colored Pellets The masterbatches and colored pellets of Examples and Comparative Examples obtained above were subjected to the following evaluation tests, and the results are shown in Tables 1 and 2. The evaluation method and evaluation criteria are shown below.

[Evaluation of Film Molded Product] The obtained masterbatch and polypropylene “F327” which is a resin to be colored.
BV "(manufactured by Grand Polypro) and pigment concentration of 1.
The mixture was mixed at 5% and melt-extruded using a T-die film molding machine (manufactured by Toyo Seiki) at a molding temperature of 250 ° C. and a screw rotation speed of 50 rpm to obtain a film having a thickness of 30 μm. In addition, the obtained base color and polypropylene "F327BV" (manufactured by Grand Polypro), which is the base resin of the masterbatch, are made into a masterbatch so that the pigment concentration is 20%, and then a film is similarly obtained. It was The colored pellet was similarly formed into a film with the same composition. The following evaluation was performed about the obtained film. (1) Evaluation of film surface condition (visual evaluation of presence / absence of film cracks, spots and smoothness) ◎: Very good ○: No problem in practical use △: Problems in any of film cracks, spots and smoothness Yes ×: Bad

[Evaluation of Pigment Dispersibility] (2) Pressure Rise at Extruder Tip If a large number of undispersed pigments are present in the base color, masterbatch and colored pellets, the mesh will be clogged during extrusion. So, the obtained base color,
The masterbatch and the colored pellets are equipped with a 10 micron-cut metal mesh at the tip and the screw diameter is 2
Using a 0 mm single-screw extruder, the pigment content was 3
00g was pushed out. Pressure applied at the initial stage of extrusion, 300g
Difference with the pressure applied to the mesh when the minute extrusion is performed (kg / c
m ² ) was calculated. If the pressure rise value is 30 kg / cm ² or less, it can be judged as good.

(3) Number of Coarse Particles Using the T-die film evaluated in the above (1), the number of particles of pigment of 1 μm or more and 50 μm or less in each film was measured by an image processor “Luzex 450” (manufactured by Toyo Ink Mfg. Co.). The following scores were given. If the score is 4 or more, it can be judged as good. 5: 1.0 × 10 ³ cells / cm ² less than ^{4: 1.0 × 10 3 ~7.0 ×} 10 3 cells / cm ² less than ^{3: 7.0 × 10 3 ~2.7 ×} 10 4 cells / cm ² less than ^{2: 2.7 × 10 4 ~7.0 ×} 10 4 cells / cm ² less than 1: 7.0 × 10 ⁴ / cm ² or more

(4) Relative color strength polypropylene "J106" (manufactured by Grand Polymer Co., Ltd.) of heat-pressed sheet
100 parts, Examples 1-3, Comparative Examples 1-2, Example 1
0, 3 parts of the base color obtained in Comparative Example 7 and 3 parts of titanium oxide "Taipec CR-60" (manufactured by Ishihara Sangyo Co., Ltd.) were mixed, and each mixture was kneaded with a two-roll mill, and then the kneaded product was obtained. It was hot pressed to obtain a plate having a thickness of 2 mm. Example 4
.About.6, 7.5 parts of the masterbatch obtained in Comparative Examples 3 to 4 and 3 parts of the above titanium oxide were mixed, and 2 mm
A thick plate was obtained. 100 parts of the colored pellets obtained in Examples 7 to 9 and Comparative Examples 5 to 6 were mixed with 3 parts of the above titanium oxide, and similarly, a plate having a thickness of 2 mm was obtained.

For each plate obtained, a color difference meter "K
"URABO COLOR-7E" (manufactured by Kurabo), 430 nm, 540 nm, 620 nm, 640n
The reflection intensity at each wavelength of m was measured, and the kubelka-Munk function (k /
s) (color development intensity) was determined. In the above, Examples 1 to 1
3, 100% the plate of Example 1 in Comparative Examples 1-2;
In Examples 4 to 6 and Comparative Examples 3 to 4, the coloring intensity of the plate of Example 4 was 100%; in Examples 7 to 9 and Comparative Examples 5 to 6, the coloring intensity of the plate of Example 7 was 100%; 1
0, the color strength of Example 10 was set to 1 for the plate of Comparative Example 7.
The relative color development intensity was determined as 00%.

(5) Spinnability evaluation 1.5 parts as a pigment component of each masterbatch or the masterbatch obtained from the base color in (1), and polypropylene resin "S106L" (manufactured by Grand Polymer Co., Ltd.) 1
Mix with 00 parts, and use a vertical test spinning machine "Spinning Tester" (manufactured by Fuji Filter Co.) to lower the hopper 18
After spinning at 0 ° C., the kneading section and the die section at 230 ° C., the mixture was stretched 3 times to obtain polypropylene fibers having a diameter of 15 μm. ◯: No problem in practical use in spinnability and drawability. △: Problem in spinnability or drawability. X: Yarn breakage occurred.

[Evaluation in Injection Molded Products] Obtained Master
-Batch and base color injection moldability
Evaluated as (6) Retention rate of mechanical properties The pigment content of the masterbatch was 1.5 parts,
100 parts of Ren "J106" (manufactured by Grand Polymer)
Back pressure 10kg / cm by injection molding ²Injection at
It molded and obtained the test piece. In addition, the above-mentioned poly that is the resin to be colored
Similarly, using propylene only
Obtained. For each plate obtained, tensile strength, bending
Three tests were conducted on the sex ratio and the Izod impact strength.
The value of the test piece consisting only of the resin to be colored is defined as 100%.
The mechanical property retention rate of each test piece was determined, and three test
The following criteria were used to evaluate the mechanical property retention rate. ○: All 96% or more Δ: 90% or more and less than 96% even in 1 test X: If less than 90% in 1 test -: Not tested

(7) Distributability A plate for distribution evaluation was obtained in the same manner as in (6) above.
The color unevenness of the obtained plate was visually evaluated. ○: No color unevenness △: Some color unevenness ×: Significant color unevenness

[0058]

[Table 1]

[0059]

[Table 2]

Example 2 and Example 10, and Comparative Example 1 and Comparative Example 7 are colored resin compositions (base colors) having the same composition, but the dispersion state thereof varies depending on the method for producing the resin composition. I understand.

From the above results, in the examples, a colored resin composition having excellent pigment dispersibility was obtained satisfactorily without foaming or pulsation of the strands, and using this, the surface properties and mechanical strength were excellent. Molded products (films, plates, fibers)
Was obtained with good color development without color unevenness. On the other hand, the colored resin compositions of Comparative Examples are inferior in productivity, pigment dispersibility, coloring strength, spinnability, etc., and sufficient properties cannot be obtained in the surface properties and mechanical strength of the obtained molded product. It was

[0062]

The colored resin composition of the present invention is a colorant resin composition containing a dispersant and a pigment, and since the dispersant is a polyolefin wax synthesized by a metallocene catalyst, it has excellent pigment dispersibility. Further, among the above-mentioned polyolefin waxes, polypropylene wax, in particular, has good compatibility with the resin to be colored, especially polypropylene, so that it is possible to produce a colored resin molded product having excellent mechanical strength and high pigment dispersibility. it can.

The colored resin composition of the present invention is a colorant resin composition containing a dispersant, a pigment and a thermoplastic resin, and since the dispersant is a polyolefin wax synthesized by a metallocene catalyst, the pigment is dispersed. Excellent in performance. Further, among the above-mentioned polyolefin waxes, particularly polypropylene wax has good compatibility with the resin to be colored, especially polypropylene, and therefore, it is possible to produce a colored resin molded product having excellent mechanical strength and high pigment dispersibility by using this. it can.

Furthermore, since the dropping point of the polyolefin wax is in the range of 60 ° C. to 140 ° C., there is no limitation on the dispersion processing machine that can be used, and the handleability is good, resulting in excellent workability.

Furthermore, since the density of the polyolefin wax is in the range of 0.87 to 0.91 g / cm ³ , there are no restrictions on the dispersing machine that can be used, and the handling and pigment filling properties are good.

Furthermore, since the viscosity (170 ° C.) of the polyolefin wax is in the range of 1 to 2000 mPa · s, a colored resin composition having good handleability during processing and wettability with pigments can be obtained. The molded product obtained by using (1) has a high pigment dispersibility and therefore has excellent mechanical properties.

As described above, since the colored resin composition of the present invention is excellent in pigment dispersibility and compatibility with the resin to be diluted, the colored resin molded product produced using the same is also excellent in pigment dispersibility.
Furthermore, since it has excellent compatibility with the resin to be colored, especially polypropylene, it is possible to provide a molded article having excellent mechanical properties and color development. In particular, remarkable effects can be obtained in high speed spinning products and molded products such as thin products such as films.

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Claims (7)

[Claims] 1. A colorant resin composition containing a dispersant and a pigment, wherein the dispersant is a polyolefin wax synthesized by a metallocene catalyst. 2. A colorant resin composition containing a dispersant, a pigment and a thermoplastic resin, wherein the dispersant is a polyolefin wax synthesized by a metallocene catalyst. 3. The wax according to claim 1, wherein the polyolefin wax is polypropylene wax.
The colored resin composition described in 1. 4. The dropping point of the polyolefin wax is 60.
The colored resin composition according to any one of claims 1 to 3, which has a temperature of from ℃ to 140 ℃. 5. The density of the polyolefin wax is 0.
It is 87-0.91 g / cm < ³ >, The colored resin composition in any one of Claims 1-4. 6. The viscosity of the polyolefin wax is 1 to
It is 2000 mPa * s, The coloring resin composition in any one of Claims 1-5. 7. A colored resin molded article comprising the colored resin composition according to any one of claims 1 to 6.