Resin molded articles

Abstract

To provide a resin molded product which exhibits excellent jet black when turned off and can convert white light into a chromatic color in a target wavelength band with high excitation purity when a white light source is turned on. [Solution] The resin molded article 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 red pigments, perylene red pigments, dioxazine 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 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 lightness L of the resin molded article is measured under a 2-degree field of view using a D65 light source for reflected light. * 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 product, particularly to a resin molded product that has excellent jet-black color and the ability to transmit light of a specific wavelength and display chromatic colors with high excitation purity on an xy chromaticity diagram. [Background technology]

[0002] In recent years, due to improvements in design and trends, there has been an increasing demand for thermoplastic resin molded products that exhibit a chromatic color tone when the light source is on, in the interior and exterior of automobiles, display signs, etc., which currently exhibit an achromatic color tone (jet black) when the light source is off.

[0003] There are two methods for giving thermoplastic resin molded products jet black when the light source is off and chromatic color when the light source is on: (1) a multi-layer method in which a jet black molded product is layered on a chromatic molded product, and (2) a single-layer method in which a pigment is blended into the thermoplastic resin.

[0004] (1) The method of realizing this by multi-layering is a well-known method. However, if it is desired to impart jet black when the light is off and chromatic color when the light is on, it is necessary to manufacture a multi-layer film by overlapping, for example, a jet black film and a chromatic color film. However, manufacturing a multi-layer film requires advanced technology and equipment, and tends to increase manufacturing costs.

[0005] On the other hand, (2) it has been thought difficult to impart the two different properties mentioned above to a single-layer resin molded product. Recently, Patent Documents 1 and 2 have proposed a method of expressing black color by using two or more organic pigments. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-31291 [Patent Document 2] Japanese Patent Application Publication No. 2024-146676 Summary of the Invention [Problem to be solved by the invention]

[0007] However, after extensive research by the present inventors, it has been found that it is difficult for a single-layer resin molded product using a pigment to have excellent jet black color when the light is off and to convert the white light into a chromatic color when a white light source is on. In particular, for automobile interiors and exteriors, signboards, and the like, it is essential from the standpoint of design to obtain vivid chromatic colors with high excitation purity when converting white light into a chromatic color when the white light source is on. However, it has been found that it is difficult for a single-layer resin molded product to not only exhibit jet black color when the light is off, but also to obtain vivid chromatic colors with high excitation purity when converting white light into a chromatic color when the white light source is on.

[0008] An object of the present invention is to provide a resin molded article that exhibits excellent jet black when the light is off and, at the same time, can convert white light from a white light source into a vivid chromatic color with high excitation purity when the white light source is on. [Means for solving the problem]

[0009] The present inventors have conducted extensive research to solve the above problems and have completed the present invention. That is, according to the present invention, there is provided the following resin molded article.

[0010] [1] A resin molded product 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 two or more second pigments selected from the group consisting of quinacridone red pigments, perylene red pigments, azo yellow pigments, isoindolinone yellow pigments, and cyanine blue pigments, the total content of the first pigments and the second pigments relative 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, and the lightness L of reflected light under a 2-degree visual field using a D65 light source is 0.12 parts by mass or more and 0.7 parts by mass or less. *a value of 30 or less, a total light transmittance of 4% or less, and an excitation purity of 75% or more on the CIE 1931 chromaticity coordinates for transmitted light when light emitted from a white light source passes through the resin molded product. [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], which is a film, sheet, molded part, or fiber. [4] The resin molded article according to any one of [1] to [3], which is an automobile interior / exterior display, a display board, a fiber material, a door visor, or synthetic leather. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a resin molded product that exhibits excellent jet black when the light is off, and at the same time, when a white light source is on, can convert the white light into a chromatic color in a target wavelength band with high excitation purity. DETAILED DESCRIPTION OF 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) The thermoplastic resin may be any thermoplastic resin used to produce general resin molded products. Examples of the thermoplastic resin 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; polyphenylene ether; and the like. These thermoplastic resins may be amorphous thermoplastic resins, and may be used alone or in combination of two or more.

[0015] The thermoplastic resin is preferably a transparent resin. A transparent resin is generally known as a resin that has little reflection or absorption of visible light and allows visible light to pass through the resin without diffusing. From the viewpoint of transparency, carbonate-based resins, acrylic-based resins, styrene-based resins, and vinyl chloride-based resins are preferred, and vinyl chloride-based resins, carbonate-based resins, and acrylic-based resins are more preferred.

[0016] (pigment) The resin molded article of the present invention contains 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 red pigments, perylene red pigments, dioxazine red pigments, azo yellow pigments, isoindolinone yellow pigments, cyanine green pigments, and cyanine blue pigments. This combination allows for the production of resin molded articles with high excitation purity, in which reflected light is black but transmitted light from a white light source exhibits the desired color. While a comparable excitation purity may be achieved with pigment combinations outside the scope of the present invention by increasing the pigment concentration, it has been found that it is difficult to achieve the same excitation purity at low concentrations, such as those used in the resin molded article of the present invention. When dyes are used in semi-crystalline resins, such as flexible transparent polyvinyl chloride resins and olefin resins, which contain a large amount of plasticizer, dye migration may occur at a certain addition level. Furthermore, in terms of weather resistance, the use of pigments allows for the production of resin molded articles with higher weather resistance than dyes.

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

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

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

[0020] Quinacridone red pigments are red pigments that have a quinacridone structure in the molecule. Examples of quinacridone red pigments include CI Pigment Red 122, CI Pigment Red 202, CI Pigment Red 209, and CI Pigment Violet 19.

[0021] The perylene-based red pigment is a red pigment having a perylene structure. Examples of perylene-based red pigments include CI Pigment Red 123, CI Pigment Red 149, CI Pigment Red 178, CI Pigment Red 179, CI Pigment Red 190, and CI Pigment Violet 29.

[0022] A dioxazine-based red pigment is a red pigment having a dioxazine structure in the molecule. An example of a dioxazine-based red pigment is CI Pigment Violet 23.

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

[0024] The isoindolinone yellow pigment is a yellow pigment having an isoindolinone structure in the molecule. Examples of the isoindolinone yellow pigment include CI Pigment Yellow 109, CI Pigment Yellow 110, and CI Pigment Yellow 173.

[0025] Cyanine green or blue pigments are green or blue pigments having a phthalocyanine structure. Examples of cyanine green pigments include CI Pigment Green 7 and CI Pigment Green 36. Examples of cyanine blue pigments include CI Pigment Blue 15, CI Pigment Blue 15:1, CI Pigment Blue 15:3, and CI Pigment Blue 15:6.

[0026] (Pigment content) In the resin molded product 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 allows for a resin molded product with suitable brightness, total light transmittance, and excitation purity to be obtained. From this perspective, it is 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, high excitation intensity can be obtained 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. From this perspective, it is 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] 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 three or more types are even more preferable. For example, even if only one type of pigment (especially green, blue, or purple pigments) is used, if the concentration is high, the transmittance will decrease and the reflected light will turn black, making it possible to transmit only specific wavelengths. However, by using three or even more types of pigments rather than two, the same effect can be achieved with a smaller amount added. Furthermore, by selectively controlling the absorption and transmission of specific wavelengths, the range of hue reproduction can be expanded. However, adding too much pigment is not recommended because it will cause a decrease in mechanical strength.

[0029] (Lightness L * Value and Saturation C * value) Generally, the method of expressing color tone is CIE L, which is a color space that represents the colors that can be seen by the human eye, established by the International Commission on Illumination (CIE). * a * b * There is a color space (CIE L) * a * b *In the color system, color is expressed by three coordinates, and lightness is "L * ", red (magenta) to green is "a * (positive is magenta, negative is greenish), yellow to blue is "b * " (positive corresponds to yellowish, negative corresponds to bluish). L * The value is an index that indicates the lightness (brightness) of a color, and is shown in the range from 0 to 100, with 0 representing perfect black (no reflection) and 100 representing perfect white (total reflection). In order to obtain a molded product with excellent jet black color, the lightness L * A value of 30 or less is preferred, and 28 or less is more preferred.

[0030] The saturation C* value is an index that indicates the low saturation of the reflected light from a resin molded product, and is an index that indicates that the reflected light is not colored, and is expressed as the distance between the point indicated by a* and b* and the origin. The higher the value, the more vivid the color, and the lower the value, the lower the saturation of the reflected light and the more jet black it is. The C* value is preferably 3 or less, and more preferably 2 or less. The lightness L of a resin molded product * Value and Saturation C * The method for measuring the values ​​is described in the Examples section.

[0031] (Total light transmittance) The total luminous transmittance (Y) value is an index that indicates the proportion of light that passes through a material, film, etc. If the total luminous transmittance is 4% or less, the influence of the base color can be reduced and the jet-black color can be maintained when the reflected color of the molded product is jet black. Furthermore, if the total luminous transmittance is 0.01% or more, light emitted from a light source, such as an LED white light source, that passes through the molded product can exhibit a specific color tone. A total luminous transmittance of 0.02% or more and 3.5% or less is more preferable, and 0.04% or more and 3% or less is even more preferable. On the other hand, if the total luminous transmittance (Y) value exceeds 4%, the color of the transmitted light becomes pale, and the desired color cannot be obtained. The method for measuring the total luminous transmittance of a resin molded product is described in the Examples section.

[0032] (dominant wavelength and complementary dominant wavelength) The dominant wavelength and complementary wavelength are used to associate the hue of monochromatic light with its wavelength, and refer to the wavelength at the point where a line extending from the chromaticity coordinates (x=0.3333, y=0.3333) of white light on the CIE (Commission Internationale de l'Eclairage) 1931 chromaticity diagram to the chromaticity coordinates (x, y) of the emitted color of the light-emitting device intersects with the spectral locus. This molded product can exhibit a specific color tone by selectively transmitting light with wavelengths within the range of the dominant wavelength and complementary wavelength.

[0033] (stimulus purity) Excitation purity on a chromaticity diagram is an index that indicates the vividness and saturation of a color. Specifically, it is the value obtained by dividing the linear distance between the chromaticity coordinates (x=0.3333, y=0.3333) of white light in the chromaticity coordinate system of the chromaticity diagram and the chromaticity coordinates (x, y) of the color emitted by the light-emitting device by the linear 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 with the spectral locus. The larger this value, the more vivid and pure the color. Conversely, the smaller the value, the closer the color is to achromatic color and the lower its saturation.

[0034] In a preferred embodiment, when light emitted from a white light source is transmitted through a resin molded article, the transmitted light has an excitation purity of 75% or more on the CIE 1931 chromaticity coordinates. This excitation purity is preferably 80% or more, and more preferably 85% or more. The method for measuring the excitation purity of the resin molded article is described in the Examples section.

[0035] (additives) The resin molded product of the present invention may contain other additives within the scope of the present invention. For example, dispersants, antioxidants, stabilizers, UV absorbers, lubricants, processing aids, antistatic agents, impact resistance aids, fillers, matting agents, etc. When the amount of resin contained in the resin molded product is taken as 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] (Manufacturing method for resin molded products) The resin molded product of the present invention can generally be obtained by melt-mixing and dispersing at least the thermoplastic resin, the first pigment, and the second pigment using a Banbury mixer, a Nauta mixer, a kneading roll, or a single-screw or twin-screw extruder, etc. Furthermore, for the purpose of achieving uniform dispersion before kneading, preliminary dispersion may be carried out using a tumbler mixer, a blender, or a high-speed mixer.

[0037] The molding method of the obtained resin molded product is not limited, but it can be molded into a predetermined shape by known methods such as injection molding, injection compression molding, pressure molding, blow molding, vacuum molding, foam molding, and extrusion molding. At this time, additives such as heat stabilizers, weather stabilizers, lubricants, pigment dispersants, and antistatic agents can be added depending on the purpose. Furthermore, other pigments or other pigments can be added depending on the purpose required for the molded product, such as high designability.

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

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

[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 resin molded article of the present invention may be used for automobile interior / exterior displays and display covers, signage boards, fiber materials, door visors, and synthetic leather. The resin molded article of the present invention exhibits a jet black color when the light source is off and a chromatic color when the light source is on, and therefore can be used to improve design and visibility.

[0041] (white light source) Examples of white light sources that can be placed on the back of a resin molded product to obtain transmitted light include incandescent lamps, fluorescent lamps, LED lamps, and HID lamps. Here, white light refers to light that appears white due to the mixture of light of multiple wavelengths, and colored light refers to light of a specific wavelength in the visible light wavelength range (e.g., red light, blue light, etc.). One type of white light source may be used alone, or two or more types may be used in combination. [Example]

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

[0043] (Examples 1 to 8, Comparative Examples 1 to 6) A soft PVC compound containing 100 parts of colorant (TK-1000 manufactured by Shin-Etsu Chemical Co., Ltd.) and 50 parts of diisonoyl phthalate plasticizer, in the formulations shown in Tables 1, 2, and 3, was kneaded in a 6-inch mixing roll at 160°C for 2 minutes. After kneading, the mixture was pressed in a press at 170°C to produce a resin molded product for testing (size: length 35 mm × width 50 mm × thickness 0.5 mm).

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

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

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

[0047] (Visual evaluation method) For the test molded product, white light (LED lamp, product name "Slim Work Light PL012", manufactured by TAKENOW) was passed 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 the resin molded product, a soft transparent white PVC sheet containing titanium oxide of the same size was attached to it, and 100 g / cm 2 The test piece was then placed in a dryer at 100°C for 2 hours, and immediately after this time the test piece 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 was observed. △: Slight migration observed. ×: There is a lot of migration.

[0049] (Weather resistance measurement) The test molded products were subjected to weather resistance testing using a weather meter in accordance with JIS K 7102. The color difference (dE) between before and after 1000 hours of weather resistance testing was * ) was measured using a spectrophotometer (CM-3600d) manufactured by Konica Minolta, Inc., using the SCI method with a C light source at a viewing angle of 2°. The evaluation criteria are shown below. The weather meter testing equipment and measurement conditions used are as follows: Testing machine Sunshine weather meter (Suga Test Instruments Co., Ltd., S80 type) was used. Measurement conditions Light source: Sunshine carbon arc lamp Cycle: Illumination 60min / Rainfall 12min (No darkness) Black Panel Temperature: 63±3℃ Average discharge voltage: 48~52V Average discharge current: 58~62A The test machine corresponds to the test machine specified in JIS B7753, and is equivalent to 13 times the test time. (Evaluation criteria) ○: The color difference after the test is (dE * ) Less than 1 △: The color difference after the test is (dE * ) 1 or more and less than 3 ×: The color difference after the test is (dE * )3 or more

[0050] [Table 1]

[0051] [Table 2]

[0052] [Table 3]

[0053] The product names of the ingredients in the table are as follows:

[0054] (coloring agent) P.BK-7: CI Pigment Black 7 (product name "Carbon Black #45", manufactured by Mitsubishi Chemical Corporation) PR-122: CI Pigment Red 122 (product name "PV Fast Pink E 01", manufactured by Heubach) PR-149: CI Pigment Red 149 (product name "PV Fast Red B", manufactured by Heubach) PY-83: CI Pigment Yellow 83 (product name "Seika First Yellow 2725", manufactured by Dainichi Seika Color & Chemicals Co., Ltd.) PY-128: CI Pigment Yellow 128 (product name "Chromophthal Yellow K 0990 FP", manufactured by DIC) PY-95: CI Pigment Yellow 95 (product name "Chromophthal Yellow K 1500 FP", manufactured by DIC) PG-7: CI Pigment Green 7 (product name "LIONOL GREEN JZF-8450", manufactured by Toyocolor Co., Ltd.) P.BL-15: CI Pigment Blue 15 (product name "Chromofine Blue 5164", manufactured by Dainichi Seika Color & Chemicals Co., Ltd.) P.BL-15:3: CI Pigment Blue 15:3 (product name "Chromofine Blue 4920 SF", manufactured by Dainichi Seika Color & Chemicals Co., Ltd.) PV-23: CI Pigment 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: CI Solvent Yellow 163 (product name "PLAST YELLOW DY-443", manufactured by Arimoto Chemical Co., Ltd.)

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

[0056] When carbon black (CI Pigment Black 7) of Comparative Example 1 was not used as a colorant, the excitation purity was 68.8%, which did not reach 75% or more. Comparative Example 2, which contained no pigment and was composed only of dye, was inferior to Examples 1 to 8 in the migration test and weather resistance test. When only carbon black (CI Pigment Black 7) of Comparative Example 3 was used as the colorant, the excitation purity was 69.5%, which did not reach 75% or more.

[0057] Comparative Example 4, which had one type of pigment, had a high excitation purity of 79.5%, but * Value, C * The value and Y value were also high, and the color of the reflected light was red. In Comparative Example 5, in which the total pigment content was 1.365 parts by mass, exceeding the upper limit, the LED white light source was not transmitted, and transmitted light could not be distinguished. In Comparative Example 6, the total pigment content was low at 0.114 parts by mass, so the excitation purity was low and L * Value, C * The values ​​and Y values ​​were high.

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

[0059] The resin molded products of the examples of the present invention all have a reflected light brightness L * The value is 30 or less, the total light transmittance is 4% or less, and C * Although the value was 3 or less, and the jet blackness was extremely high, the excitation purity of transmitted light was extremely high, at 75% or more. Moreover, it was possible to provide such a resin molded product with a small total content of the first pigment and the second pigment of 0.7 parts by mass or less.

[0060] In contrast, the resin molded articles of the comparative examples did not have such 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 two or more second pigments selected from the group consisting of quinacridone red pigments, perylene red pigments, azo yellow pigments, isoindolinone yellow pigments, and cyanine blue pigments, the total content of the first pigments and the second pigments relative 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, and the lightness L of reflected light under a 2-degree visual field using a D65 light source is ＊ a value of 30 or less, a total light transmittance of 4% or less, and an excitation purity of 75% or more on the CIE 1931 chromaticity coordinates for transmitted light when light emitted from a white light source is transmitted through the resin molded product.

2. C ＊ 2. The resin molded article according to claim 1, wherein the value is 3 or less.

3. 3. The resin molded article according to claim 1, which is a film, a sheet, a molded part or a fiber.

4. 4. The resin molded article according to claim 3, which is an automobile interior / exterior display, a display board, a fiber material, a door visor, or synthetic leather.

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