Resin molded articles

Abstract

The present invention provides a resin molded product that exhibits excellent jet-blackness when the light is off, and at the same time, when a white light source is turned on, it can convert that white light into chromatic colors of a target wavelength band with high stimulating purity. [Solution] The resin molded product contains a thermoplastic resin and two or more pigments. The two or more pigments include one or more first pigments selected from the group consisting of carbon black and composite oxide pigments, and one or more second pigments selected from the group consisting of quinacridone-based red pigments, perylene-based red pigments, dioxazine-based red pigments, azo-based yellow pigments, isoindolinone-based yellow pigments, cyanine-based green pigments, and cyanine-based blue pigments. The total content of the first and second pigments per 100 parts by mass of the thermoplastic resin is 0.12 parts by mass or more and 0.7 parts by mass or less, and the brightness L of the reflected light in a D65 light source at a 2-degree field of view. * The value is 30 or less, and the total light transmittance is 4% or less.

Description

[Technical Field]

[0001] The present invention relates to a resin molded article. In particular, it relates to a resin molded article that has excellent blackness and the function of transmitting light of a specific wavelength to display highly stimulating chromatic colors on an xy chromaticity diagram. [Background technology]

[0002] In recent years, due to improvements in design and current trends, there has been a growing demand for thermoplastic resin molded products that exhibit achromatic colors (jet black) when the light source is off, but display chromatic colors when the light source is on, for use in automotive interiors and exteriors, signage, and other applications.

[0003] As a method for imparting jet blackness to thermoplastic resin molded products when the light source is off and colored when the light source is on, there are two methods: (1) a multi-layer method achieved by layering a jet black molded product and a colored molded product, and (2) a single-layer method achieved by blending pigments into the thermoplastic resin.

[0004] (1) The method of achieving this through multi-layering is a known method. However, if it is desired to provide jet blackness when the light is off and color when the light is on, it is necessary to manufacture a multi-layer film by layering a jet black film and a colored film, for example. However, the manufacture of multi-layer films requires advanced technology and equipment, and the manufacturing cost tends to be high.

[0005] On the other hand, (2) it has been considered difficult to impart the two aforementioned heterogeneous properties to a single-layer resin molded product. Recently, however, Patent Documents 1 and 2 have proposed a method for expressing black using two or more organic pigments. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2017-31291 [Patent Document 2] Japanese Patent Publication No. 2024-146676 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, after repeated investigations by the inventors, it was found that single-layer resin molded products using pigments exhibited excellent jet blackness when the light was off, but it was difficult to convert the white light from a white light source into chromatic colors when the white light source was turned on. In particular, for automotive interiors and exteriors and display signs, from a design perspective, it is essential to obtain vivid chromatic colors with high stimulating purity when converting white light from a white light source into chromatic colors. However, in reality, it has become clear that it is difficult for single-layer resin molded products to not only exhibit jet blackness when the light is off, but also to obtain vivid chromatic colors with high stimulating purity when converting white light from a white light source.

[0008] The object of the present invention is to provide a resin molded product that exhibits excellent jet blackness when the light is off, and at the same time can convert the white light of a white light source into vivid chromatic colors with high stimulating purity when the white light source is turned on. [Means for solving the problem]

[0009] The inventors of this invention have diligently studied and, as a result, completed the present invention in order to solve the above problems. That is, according to the present invention, the following resin molded product is provided.

[0010] [1] A resin molded article containing a thermoplastic resin and two or more pigments, The resin molded article contains at least one first pigment selected from the group consisting of carbon black and composite oxide pigments, and at least one second pigment selected from the group consisting of quinacridone red pigments, perylene red pigments, azo yellow pigments, isoindolinone yellow pigments, cyanine green pigments, and cyanine blue pigments. The total content of the first pigment and the second pigment with respect to 100 parts by mass of the thermoplastic resin is 0.12 parts by mass or more and 0.7 parts by mass or less. The lightness L* value in the 2-degree field of view of the D65 light source of the reflected light is 30 or less, the total light transmittance is 4% or less, and the excitation purity on the CIE1931 chromaticity coordinates of the transmitted light when the light emitted from the white light source passes through the resin molded article is 75% or more. [2] The resin molded article according to [1], characterized in that the C* value is 3 or less. [3] The resin molded article according to [1] or [2], characterized in that it is a film, a sheet, a molded part, or a fiber. [4] The resin molded article according to [1] to [3], characterized in that it is an automotive interior or exterior display, a display board, a fiber material, a door visor, or synthetic leather.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a resin molded article that exhibits excellent blackness when turned off and can convert the white light into a colored light in a target wavelength band with high excitation purity when the white light source is turned on.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments.

[0013] The resin molded article of the present invention is a resin molded article containing a thermoplastic resin and two or more pigments.

[0014] (Thermoplastic resin) As the thermoplastic resin, thermoplastic resins commonly used for manufacturing resin molded products can be used. Examples of thermoplastic resins include polyolefin resins such as polyethylene and polypropylene; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; carbonate resins such as polycarbonate; vinyl chloride resins such as polyvinyl chloride; styrene resins such as polystyrene; ABS; polyamide; acrylic resins such as polymethyl methacrylate; polyurethane; and polyphenylene ether. These thermoplastic resins may be amorphous thermoplastic resins, and can be used individually or in combination of two or more.

[0015] As the thermoplastic resin, a transparent resin is preferred. A transparent resin is generally known to be a resin that reflects and absorbs little visible light and transmits visible light without diffusion within the resin. From the viewpoint of transparency, carbonate resins, acrylic resins, styrene resins, and vinyl chloride resins are preferred, and vinyl chloride resins, carbonate resins, and acrylic resins are more preferred.

[0016] (Pigment) The resin molded article of the present invention contains two or more pigments. These two or more pigments include one or more first pigments selected from the group consisting of carbon black and composite oxide pigments, and one or more second pigments selected from the group consisting of quinacridone-based red pigments, perylene-based red pigments, dioxazine-based red pigments, azo-based yellow pigments, isoindolinone-based yellow pigments, cyanine-based green pigments, and cyanine-based blue pigments. This combination allows for the production of a resin molded article with high irritation purity, where the reflected light is black, but the transmitted light from a white light source is the desired color. While similar irritation purity may be achievable with pigment combinations outside the present invention if the pigment concentration is high, it has been found that achieving similar irritation purity at the low concentrations of the resin molded article of the present invention is difficult. When using dyes, for example, in semi-crystalline resins such as soft transparent polyvinyl chloride resins and olefin resins containing a large amount of plasticizer, dye migration may occur at a certain level of addition. Furthermore, regarding weather resistance, using pigments makes it possible to obtain resin molded articles with higher weather resistance compared to dyes.

[0017] The first pigment is one or more pigments selected from the group consisting of carbon black and composite oxide pigments. However, two or more types of first pigments may be used, and both carbon black and composite oxide pigments may be used. Examples of carbon black pigments (CIPigment Black 7) include furnace black, thermal black, acetylene black, and Ketjen black.

[0018] Examples of composite oxide pigments include iron black (CIPigment Black 11), iron / copper / manganese composite oxide (CIPigment Black 26), and iron / chromium composite oxide (CIPigment Brown 29).

[0019] The second pigment is one or more pigments selected from the group consisting of quinacridone-based red pigments, perylene-based red pigments, dioxazine-based red pigments, azo-based yellow pigments, isoindolinone-based yellow pigments, cyanine-based green pigments, and cyanine-based blue pigments. Two or more second pigments may be used. In addition, red pigments and yellow pigments may be used in combination, red pigments and green pigments may be used in combination, red pigments and blue pigments may be used in combination, yellow pigments and green pigments may be used in combination, blue pigments and yellow pigments may be used in combination, and blue pigments and green pigments may be used in combination.

[0020] Quinacridone-based red pigments are red pigments that have a quinacridone structure within their molecule. Examples of quinacridone-based red pigments include CIPigment Red 122, CIPigment Red 202, CIPigment Red 209, and CIPigment Violet 19.

[0021] Perylene-based red pigments are red pigments that have a perylene structure. Examples of perylene-based red pigments include CIPigment Red 123, CIPigment Red 149, CIPigment Red 178, CIPigment Red 179, CIPigment Red 190, and CIPigment Violet 29.

[0022] Dioxazine-based red pigments are red pigments that have a dioxazine structure within their molecule. An example of a dioxazine-based red pigment is CIPigment Violet 23.

[0023] Azo yellow pigments are yellow pigments that have an azo group in their molecule and are classified into soluble azo pigments, insoluble azo pigments, and condensed azo pigments. In this invention, insoluble azo pigments and condensed azo pigments are preferred. Examples of insoluble azo pigments include CIPigment Yellow 14, CIPigment Yellow 17, CIPigment Yellow 81, CIPigment Yellow 83, CIPigment Yellow 113, CIPigment Yellow 155, and CIPigment Yellow 214. Examples of condensed azo pigments include CIPigment Yellow 93, CIPigment Yellow 94, CIPigment Yellow 95, CIPigment Yellow 128, and CIPigment Yellow 166.

[0024] Isoindolinone-based yellow pigments are yellow pigments that have an isoindolinone structure in their molecule. Examples of isoindolinone-based yellow pigments include CIPigment Yellow 109, CIPigment Yellow 110, and CIPigment Yellow 173.

[0025] Cyanine-based green or blue pigments are green or blue pigments that have a phthalocyanine structure. Examples of cyanine-based green pigments include CIPigment Green 7 and CIPigment Green 36. Examples of cyanine-based blue pigments include CIPigment Blue 15, CIPigment Blue 15:1, CIPigment Blue 15:3, and CIPigment Blue 15:6.

[0026] (Pigment content) In the resin molded article of the present invention, the total content of the first pigment and the second pigment per 100 parts by mass of thermoplastic resin is 0.12 parts by mass or more. This makes it possible to obtain a resin molded article having suitable brightness, total light transmittance, and irritation purity. From this viewpoint, it is even more preferable that the total content of the first pigment and the second pigment per 100 parts by mass of thermoplastic resin be 0.14 parts by mass or more. Furthermore, in the present invention, even when the total content of the first pigment and the second pigment per 100 parts by mass of thermoplastic resin is reduced to 0.7 parts by mass or less, a high irritation intensity can be obtained. From this viewpoint, it is even more preferable that the total content of the first pigment and the second pigment per 100 parts by mass of thermoplastic resin be 0.6 parts by mass or less.

[0027] Furthermore, the ratio of the content of the first pigment to the content of the second pigment (content of the first pigment / content of the second pigment) is preferably 0.05 to 0.7, and more preferably 0.07 to 0.5.

[0028] It is preferable to use two or more types of pigments in resin molded products, and more preferably three or more. For example, even if only one type of pigment is used (especially green, blue, or purple pigments), at high concentrations, the transmittance decreases and the reflected light becomes black, making it possible to transmit only specific wavelengths. However, by using three or more types of pigments, similar effects can be obtained with a smaller amount of additive. Furthermore, by selectively controlling the absorption and transmission of specific wavelengths, the range of hue reproduction can also be broadened. Adding too much pigment is undesirable because it reduces mechanical strength.

[0029] (Lightness L * Value and saturation C * value) Generally, a method for representing color tones is the CIE L color space, which is formulated by the International Commission on Illumination (CIE) to represent visible colors as a color space. * a * b * There is a color system (color space). This CIE L * a * b *In a color system, color is represented by three coordinates, where lightness is "L * ", red (magenta) to green is "a * " (positive for magenta, negative for greenish), and yellow to blue is "b * " (positive for yellowish, negative for bluish), respectively. The L * value is one of the indices representing the lightness (brightness) of a color, shown in the range from 0 to 100, where 0 represents complete black (no reflection) and 100 represents complete white (total reflection). To obtain a molded product with excellent blackness, the lightness L * value at a 2-degree field of view of the D65 light source for reflected light is preferably 30 or less, and more preferably 28 or less.

[0030] The chroma C* value is one of the indices indicating that the chroma of the reflected light from the resin molded product is low. It is an index indicating that the reflected light is not colored and is represented by the distance between the point indicated by a*b* and the origin. The larger the value, the more vivid the color, and the lower the value, the lower the chroma of the reflected light, indicating blackness. The C* value is preferably 3 or less, and more preferably 2 or less. The method for measuring the lightness L * value and chroma C * value of the resin molded product is described in the items of the examples.

[0031] (Total light transmittance) The total light transmittance Y value is one of the indices indicating the ratio of light passing through materials, films, etc. If the total light transmittance is 4% or less, when the reflected color of the molded product is black, the influence of the color of the base can be reduced and blackness can be maintained. Also, if the total light transmittance is 0.01% or more, the light source passing through the molded product, for example, the light emitted from an LED white light source, can exhibit a specific color tone. The total light transmittance is more preferably 0.02% or more and 3.5% or less, and even more preferably 0.04% or more and 3% or less. On the other hand, if the total light transmittance Y value exceeds 4%, the color of the transmitted light becomes lighter and the target color cannot be obtained. The method for measuring the total light transmittance of the resin molded product is described in the items of the examples.

[0032] (Dominant wavelength and complementary dominant wavelength) The dominant wavelength and complementary dominant wavelength are used to associate the hue of monochromatic light with wavelength. They refer to the wavelength at which the spectral locus intersects with the extension of a line drawn connecting the chromaticity coordinates of white light (x=0.3333, y=0.3333) and the chromaticity coordinates of the emitted color of the light-emitting device (x, y) in the CIE (International Commission on Illumination) 1931 chromaticity diagram. This molded product can exhibit a specific hue by selectively transmitting light of wavelengths within the range of the dominant wavelength and complementary dominant wavelength.

[0033] (stimulus purity) Stimulus purity on the chromaticity diagram is an indicator of the vividness and saturation of a color. Specifically, it is the value obtained by dividing the straight-line distance between the chromaticity coordinates of white light (x=0.3333, y=0.3333) and the chromaticity coordinates of the emitted color of the light-emitting device (x, y) by the straight-line distance from the chromaticity of the white light, through the chromaticity of the light emitted by the light-emitting device, to the chromaticity where it intersects the spectral locus. A larger value indicates a more vivid and pure color. Conversely, a smaller value indicates a color that is closer to achromatic and has lower saturation.

[0034] In a preferred embodiment, the transmitted light, when light emitted from a white light source passes through the resin molded product, has a stimulating purity of 75% or more on the CIE1931 chromaticity coordinate system. This stimulating purity is preferably 80% or more, and more preferably 85% or more. The method for measuring the stimulating purity of the resin molded product is described in the Examples section.

[0035] (Additives) The resin molded articles of the present invention may contain other additives without departing from the spirit of the present invention. For example, they may contain dispersants, antioxidants, stabilizers, ultraviolet absorbers, lubricants, processing aids, antistatic agents, impact-resistant aids, fillers, matting agents, etc. When the amount of resin contained in the resin molded article is 100 parts by mass, the content of other additives is preferably 5 parts by mass or less, and may be 0 parts by mass.

[0036] (Method of manufacturing resin molded products) The resin molded articles of the present invention can generally be obtained by melt-mixing and dispersing at least a thermoplastic resin, a first pigment, and a second pigment using a Banbury mixer, Nauter mixer, kneading roll, or a single-screw or twin-screw extruder. Alternatively, pre-dispersion may be performed using a tumbler mixer, blender, or high-speed mixer to ensure uniform dispersion before kneading.

[0037] The resulting resin molded product can be molded into a predetermined shape using known methods such as injection molding, injection compression molding, pressure molding, blow molding, vacuum molding, foam molding, or extrusion molding, although these methods are not limited to those described above. Additives such as heat stabilizers, weather stabilizers, lubricants, pigment dispersants, and antistatic agents may be added depending on the purpose. Furthermore, other pigments may be added depending on the requirements of the molded product, such as achieving high aesthetic appeal.

[0038] The thickness of the resin molded product is preferably 0.2 to 10 mm, from the viewpoint of maintaining blackness and purity.

[0039] The total pigment content per 100 parts by mass of the resin molded product varies depending on the thickness of the molded product. For example, when the thickness of the molded product is 0.1 mm or more and less than 1 mm, the total pigment content per 100 parts by mass is preferably 0.5 parts by mass or more and 10 parts by mass or less. When the thickness of the molded product is 1 mm or more and less than 3 mm, it is preferable that the amount is 0.12 parts by mass or more and 0.7 parts by mass or less. When the thickness of the molded product is 3 mm or more and 10 mm or less, it is preferable that the amount is 0.01 parts by mass or more and 0.5 parts by mass or less. By increasing the total pigment content beyond the above-mentioned quantity, the L* value of reflected light decreases, resulting in a more jet-black hue and further improving the stimulating purity of transmitted light under a white light source. This makes it easier to obtain resin molded products with any desired color tone. On the other hand, by decreasing the total pigment content beyond the above-mentioned quantity, the transmittance increases, making it easier to visually distinguish transmitted colors. Furthermore, concerns about a decrease in mechanical strength are reduced.

[0040] (Application) The form of the resin molded article of the present invention is not limited and may be a film, sheet, molded part, or fiber. Furthermore, the applications of the resin molded article of the present invention may include automotive interior and exterior displays and display covers, signboards, fiber materials, door visors, and synthetic leather. The resin molded article of the present invention exhibits jet black when the light source is off and chromatic colors when the light source is on, so it can be used to improve design and visibility.

[0041] (white light source) Examples of white light sources used to obtain transmitted light when installed on the back of a resin molded product include incandescent lamps, fluorescent lamps, LED lamps, and HID lamps. Here, white light refers to light that appears white due to the mixture of multiple wavelengths, while colored light refers to light of a specific wavelength within the visible light wavelength range (for example, red light, blue light, etc.). A single white light source may be used alone, or two or more types may be used in combination. [Examples]

[0042] The present invention will be described in detail below based on examples, but the present invention is not limited to these examples. In the examples and comparative examples, "parts" and "%" are based on mass unless otherwise specified.

[0043] (Examples 1-8, Comparative Examples 1-6) The colorants for each example shown in Tables 1, 2, and 3, along with 100 parts of polyvinyl chloride (TK-1000, manufactured by Shin-Etsu Chemical Co., Ltd.) and 50 parts of diisonoyl phthalate (a plasticizer), were mixed in a 6-inch mixing roll at 160°C for 2 minutes. After mixing, the mixtures were pressed at 170°C using a press machine to produce test resin molded products (size: 35 mm long x 50 mm wide x 0.5 mm thick).

[0044] (L * Value, C * (Measurement of values) For the test molded product, the reflectance of SCI was measured using a spectrophotometer (product name "CM-36dG", manufactured by Konica Minolta), and L was measured with a light source D65 and a field of view of 2°. * Value, C * The values ​​were calculated. The results are shown in Tables 1, 2, and 3.

[0045] (Measurement of color, including dominant wavelength, complementary dominant wavelength, stimulation purity, and xy values ​​on the chromaticity diagram) White light (LED lamp, product name "Slim Work Light PL012", manufactured by TAKENOW) was transmitted through the back of a resin molded product, and the light transmitted through the front of the resin molded product was measured using a spectroradiometer (product name "CL-500A", manufactured by Konica Minolta) to obtain the irritation purity at a field of view of 2°. The results are shown in Tables 1, 2, and 3.

[0046] (Measurement of total light transmittance) The total light transmittance (Y value at a light source D65 and field of view of 2°) of the resin molded product was measured using a spectrophotometer (product name "CM-36dG", manufactured by Konica Minolta). The results are shown in Tables 1, 2, and 3.

[0047] (Measurement by visual evaluation method) For the test molded product, white light (LED lamp, product name "Slim Work Light PL012", manufactured by TAKENOW) was transmitted through the back of the test molded product, and the color of the light transmitted through the surface of the test molded product was observed visually. The results are shown in Tables 1, 2, and 3.

[0048] (Migration evaluation) For resin molded products, a soft, transparent white PVC sheet containing titanium dioxide of the same dimensions is attached to the product, at a density of 100 g / cm². 2 The load was applied. Next, the product was kept in a dryer at 100°C for 2 hours. Immediately after the time elapsed, the test molded product was removed, and the degree of color transfer to the white sheet was visually observed and evaluated according to the following criteria. (Evaluation Criteria) ○: No migration is permitted at all. △: Slight migration observed. ×: There are many migrations.

[0049] (Weather resistance measurement) A weather resistance test was conducted on the test molded product using a weatherometer in accordance with JIS K 7102. The color difference (dE) before the weather resistance test and after 1000 hours of weather resistance testing was measured. * The temperature was measured using a Konica Minolta spectrophotometer (CM-3600d) with the SCI method and a C light source field of view of 2°. The evaluation criteria are shown below. The weather meter used and the measurement conditions are as follows. Testing machine A sunshine weather meter (manufactured by Suga Test Instruments Co., Ltd., model S80) was used. Measurement conditions Light source: Sunshine carbon arc lamp Cycle: Irradiation 60 min / Rainfall 12 min (no darkness) Black panel temperature: 63±3℃ Average discharge voltage: 48~52V Average discharge current: 58~62A The testing machine corresponds to the testing machine specified in JIS B7753, and the test time is equivalent to 13 times the test time. (Evaluation Criteria) ○: The color difference after the test, based on the color before the test, is (dE * ) Less than 1 △: The color difference after the test, relative to the color before the test, is (dE * ) 1 or more but less than 3 ×: The color difference after the test, based on the color before the test, is (dE * ) 3 or more

[0050] [Table 1]

[0051] [Table 2]

[0052] [Table 3]

[0053] The product names for each ingredient listed in the table are as follows:

[0054] (Coloring agent) • P.BK-7: CIPigment Black 7 (Product name "Carbon Black #45", manufactured by Mitsubishi Chemical Corporation) • PR-122: CIPigment Red 122 (Product name "PV Fast Pink E 01", manufactured by Heubach) • PR-149: CIPigment Red 149 (product name "PV Fast Red B", manufactured by Heubach) • PY-83: CIPigment Yellow 83 (Product name "Seika First Yellow 2725", manufactured by Dainichi Seika Co., Ltd.) • PY-128: CIPigment Yellow 128 (Product name "Chromophtal Yellow K 0990 FP", manufactured by DIC Corporation) • PY-95: CIPigment Yellow 95 (product name "Chromophtal Yellow K 1500 FP", manufactured by DIC Corporation) • PG-7: CIPigment Green 7 (Product name "LIONOL GREEN JZF-8450", manufactured by Toyo Color Co., Ltd.) • P.BL-15: CIPigment Blue 15 (Product name "Chromofine Blue 5164", manufactured by Dainichi Seika Co., Ltd.) • P.BL-15:3: CIPigment Blue 15:3 (Product name "Chromofine Blue 4920 SF", manufactured by Dainichi Seika Co., Ltd.) • PV-23: CIPigment Violet 23 (product name "PV FastViolet RL", manufactured by Heubach) • S.BL-122: CISolvent Blue 122 (Product name "POLYSYNTHREN BLUE R", manufactured by Heubach) • SR-212: CISolvent Red 212 (product name "POLYSYNTHREN RED GG", manufactured by Heubach) • SY-163: CISolvent Yellow 163 (Product name "PLAST YELLOW DY-443", manufactured by Arimoto Chemical Co., Ltd.)

[0055] (resin) Soft transparent PVC: A flexible PVC compound containing 100 parts of polyvinyl chloride (TK-1000, manufactured by Shin-Etsu Chemical Co., Ltd.) and 50 parts of diisonoyl phthalate, a plasticizer.

[0056] When carbon black (CIPigment Black 7) from Comparative Example 1 was not used as a coloring agent, the irritation purity was 68.8%, and did not reach 75% or higher. Comparative Example 2, which contained only dyes and no pigments, performed worse than Examples 1-8 in migration and weather resistance tests. When only carbon black (CIPigment Black 7) from Comparative Example 3 was used as the coloring agent, the irritation purity was 69.5%, and did not reach 75% or higher.

[0057] Comparative Example 4, which used only one type of pigment, had a high irritation purity of 79.5%, but L * Value, C * The values ​​and Y-values ​​were high, and the reflected light was red in color. Comparative Example 5, which had a total pigment content exceeding the upper limit at 1.365 parts by mass, could not transmit the LED white light source, making it impossible to distinguish the transmitted light. In Comparative Example 6, the total pigment content was low at 0.114 parts by mass, resulting in low irritation purity and L * Value, C * The Y-value was high.

[0058] On the other hand, the resin molded articles of the present invention in Examples 1 to 8 met all the criteria. Furthermore, as shown in Tables 1, 2, and 3, molded articles with high irritation purity were obtained at each major wavelength in the xy values ​​of the chromaticity diagram.

[0059] The resin molded articles of the embodiments of the present invention all have a reflected light brightness L * The value is 30 or less, and the total light transmittance is 4% or less, C * Despite having a value of 3 or less and an extremely high degree of blackness, the transmitted light stimulation purity was very high at 75% or more. Moreover, it was possible to provide such a resin molded product with a total content of 0.7 parts by mass or less for the first and second pigments.

[0060] In contrast, the resin molded product of the comparative example did not possess these desired physical properties.

Claims

1. A resin molded article containing a thermoplastic resin and two or more pigments, The two or more pigments include one or more first pigments selected from the group consisting of carbon black and composite oxide pigments, and one or more second pigments selected from the group consisting of quinacridone-based red pigments, perylene-based red pigments, dioxazine-based red pigments, azo-based yellow pigments, isoindolinone-based yellow pigments, cyanine-based green pigments, and cyanine-based blue pigments, and the total content of the first and second pigments per 100 parts by mass of the thermoplastic resin is 0.12 parts by mass or more and 0.7 parts by mass or less, and the brightness L of the reflected light in a D65 light source at a 2-degree field of view ＊ A resin molded product characterized in that the value is 30 or less, the total light transmittance is 4% or less, and the transmitted light when light emitted from a white light source passes through the resin molded product has a stimulating purity of 75% or more on the CIE 1931 chromaticity coordinate system.

2. C ＊ A resin molded article according to claim 1, characterized in that the value is 3 or less.

3. A resin molded article according to claim 1 or 2, characterized in that it is a film, a sheet, a molded part, or a fiber.

4. The resin molded article according to claim 3, characterized in that it is a display, signboard, textile material, door visor, or synthetic leather for the interior or exterior of an automobile.

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