Structure having optical effect and preparing method thereof

Abstract

The present invention provides a structure with pearl luster, comprising: an opaque base layer; and a transparent cover layer disposed on the opaque base, wherein the opaque base layer and the transparent cover layer do not include a pearl pigment.

Description

Structure exhibiting optical effects and method for manufacturing the same

[0001] The present invention relates to a structure exhibiting an optical effect and a method for producing the same. More specifically, the present invention relates to a structure exhibiting an optical effect that realizes a pearlescent appearance effect on its surface and a method for producing the same.

[0002]

[0003] Pearlescent paints are used in interior and exterior finishes for a variety of products, including automobiles, electronics, and cosmetics. Their unique metallic texture, shine, and coloration are particularly noteworthy, making them a perennial favorite. To achieve this, they are manufactured by adding aluminum flakes, sparkles, and pearl particles to synthetic resin and extruding or injection molding them.

[0004] Since the pearl effect is caused by an optical phenomenon that pearl pigments cause within synthetic resins, it is most effective when used with resins with excellent transparency, such as PVC, PS, acrylics, and PMMA. In addition, an excellent gloss effect can be obtained when applied to translucent resins, such as polypropylene, polyethylene, and ABS, or other opaque resins, and recently, its use in engineering plastics, such as polyamide, polycarbonate, and polyethylene terephthalate (PET), is also on the rise.

[0005] The conventional method of implementing a pearl effect involves adding pearl pigment to the compound of synthetic resin. However, this method has the disadvantage of causing flow marks and weld lines on the exterior due to particle directionality issues and product structure (rib / boss) during injection molding, resulting in poor appearance. In addition, some of the properties of existing synthetic resins, such as impact strength, are reduced. Furthermore, synthetic resins with added pearl pigments cannot be recycled, making them undesirable from an environmental perspective.

[0006] Therefore, there is an urgent need to develop a method that can exhibit optical effects such as pearl effect in synthetic resin structures without directly adding metal flakes or pearl pigments.

[0007] As a background technology of the present invention, Korean Patent Publication No. 10-2013-0011107 discloses a coating film that produces a pearl effect and a method for manufacturing an architectural interior molding using the coating film, but it does not produce an optical effect such as a pearl effect without using a pearl pigment.

[0008]

[0009] The purpose of the present invention is to provide a structure capable of implementing an optical effect such as pearl luster without using pearl pigment.

[0010] The above and other objects of the present invention can all be achieved by the present invention described below.

[0011]

[0012] 1. One aspect of the present invention relates to a structure having pearl luster.

[0013] The structure having the pearl luster comprises an opaque base layer having a pattern formed on the surface; and

[0014] A transparent cover layer disposed on the above opaque base;

[0015] The above opaque base layer and the above transparent cover layer do not contain pearl pigment.

[0016] 2. In the above 1 specific example, the opaque base layer and the transparent cover layer may have complementary colors.

[0017] 3. In the above 1 or 2 specific examples, the opaque base layer and the transparent cover layer may be arranged spaced apart from each other.

[0018] 4. Another aspect of the present invention relates to a structure exhibiting an optical effect having a transparent cover portion.

[0019] The structure exhibiting the above optical effect comprises a base body having a pattern formed on the surface; and

[0020] It includes a cover part which is provided in a shape that wraps around the entire base body part and is spaced apart from the base body part at regular intervals.

[0021] 5. In the above 4 specific examples, the base body part may be opaque.

[0022] 6. In the above 4 or 5 specific examples, the base body and cover may not include pearl pigment.

[0023] 7. In any one of the embodiments 4 to 6 above, the pattern can be formed by imprinting from a mold.

[0024] 8 In any one of the specific examples 4 to 7 above, the corrosion pattern of the base body portion may have a corrosion depth of about 2 µm to about 10 µm as measured by a three-dimensional surface roughness measuring device.

[0025] 9. In any one of the above embodiments 4 to 8, the base body portion has an edge having at least one curvature, and the radius of curvature of the edge can be determined according to the following equation 1.

[0026] [Formula 1]

[0027] 1.5T ≤ R ≤ 2.0T

[0028] In the above equation 1, R is the radius of curvature, and T is the thickness of the base body.

[0029] 10. In any one of the specific examples 4 to 9 above, the cover part covers the entire base body part, and light reflected from the surface of the base body part can be transmitted.

[0030] 11. In any one of the above embodiments 4 to 10, the cover portion may exhibit a fluorescent color.

[0031] 12. In any one of the specific examples 4 to 11 above, the thickness of the cover portion may be about 1 mm to about 2 mm.

[0032] 13. In any one of the specific examples 4 to 12 above, the cover portion may have a transmittance of about 70% to about 90% at a D65 light source using a haze meter at a thickness of about 1 mm.

[0033] 14. In any one of the embodiments 4 to 13 above, the gap may be about 0.1 to about 0.6 mm.

[0034] 15. In any one of the specific examples 4 to 14 above, the base body portion and the cover portion may have complementary colors.

[0035]

[0036] The structure exhibiting the optical effect according to the present invention can exhibit the same pearl effect as one with pearl pigment added, without adding pearl pigment. The pearl effect can be achieved using common colors of synthetic resin, and the simple manufacturing process not only reduces labor costs but also eliminates the need for pearl pigment, making the structure itself recyclable, making it highly environmentally friendly.

[0037] Additionally, since pearl pigments are not directly added, the occurrence of defects such as flow marks and weld lines on the appearance can be prevented without changing the physical properties of the structure itself.

[0038]

[0039] FIG. 1 is a perspective view of a structure showing an optical effect according to one specific example of the present invention.

[0040] Fig. 2 is an exploded perspective view of a structure showing an optical effect according to Fig. 1.

[0041] Fig. 3 is a cross-sectional side view of a structure showing an optical effect according to Fig. 1.

[0042] Figure 4 shows a state of use of another mobile phone case according to another specific example of the present invention.

[0043] Figure 5 is a process flow diagram of a method for manufacturing a structure exhibiting an optical effect according to another aspect of the present invention.

[0044] FIG. 6 is a photograph of a structure exhibiting an optical effect according to one specific example of the present invention.

[0045] FIG. 7 illustrates a case where the base body and the cover have complementary colors in a structure exhibiting an optical effect according to one specific example of the present invention.

[0046] FIG. 8 is an enlarged photograph of a corner of a structure exhibiting an optical effect according to one specific example of the present invention.

[0047]

[0048] Hereinafter, the present invention will be described in more detail with reference to the attached drawings. However, the drawings are provided solely to aid understanding of the present invention and are not intended to limit the present invention. Furthermore, the shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings are exemplary and the present invention is not limited to the details depicted.

[0049] Throughout the specification, identical reference numerals designate identical components. Furthermore, in describing the present invention, detailed descriptions of related known technologies are omitted if they are deemed to unnecessarily obscure the gist of the present invention.

[0050] In the specification, when "includes," "has," and "consists of" are used, other parts may be added unless "only" is used. When a component is expressed in the singular, it includes cases where the plural is included unless there is a special explicit description.

[0051] When interpreting a component, it is interpreted as including the error range even if there is no separate explicit description.

[0052] When the positional relationship between two parts is described as 'on top of', 'upper part of', 'lower part of', 'next to', etc., one or more other parts can be located between the two parts unless 'right away' or 'directly' is used.

[0053] Positional relationships such as "upper," "top surface," "lower surface," and "lower surface" are merely described based on the drawing and do not represent absolute positional relationships. In other words, depending on the viewing position, the positions of "upper" and "lower" or "upper surface" and "lower surface" may change.

[0054] In this specification, “a to b” indicating a numerical range is defined as “≥a and ≤b”.

[0055]

[0056] Hereinafter, a structure according to one specific example of the present invention will be described with reference to the drawings.

[0057] FIG. 1 is a perspective view of a structure (1000) exhibiting an optical effect according to one specific example of the present invention, FIG. 2 is an exploded perspective view of the structure exhibiting an optical effect according to FIG. 1, and FIG. 3 is a side cross-sectional view of the structure (1000) exhibiting an optical effect according to FIG. 1.

[0058] Referring to FIGS. 1 to 3, one aspect of the present invention relates to a structure (1000) having a pearlescent luster.

[0059] The above structure (1000) includes an opaque base layer (100) and a transparent cover layer (200).

[0060] The surface of the above base layer (100) is formed with a pattern, and specifically, the pattern may be a groove formed to a certain depth by imprinting from a mold. The specific shape of the pattern is not limited as long as it has a structure in which light is introduced and diffused reflection occurs, and when light is incident on the pattern, a pearlescent luster can be observed on the surface of the transparent cover layer (200) due to diffuse reflection.

[0061] The above transparent cover layer (200) is placed on the above base layer (100), and light is observed on the surface by passing through the cover layer (200) due to the diffuse reflection. The above opaque base layer (100) and the transparent cover layer (200) may have complementary colors, in which case the pearlescent effect may be increased.

[0062] In one specific example, the opaque base layer (100) and the transparent cover layer (200) may be spaced apart from each other.

[0063] When the transparent cover layer (200) is positioned at a certain distance from the opaque base layer (100), the diffuse reflection of light transmitted from the outside can be increased, thereby further increasing the effect of pearl luster.

[0064] Therefore, a structure having pearl luster according to one aspect of the present invention can exhibit pearl luster without including pearl pigment by using an opaque base layer (100) and a transparent cover layer (200).

[0065] Another aspect of the present invention relates to a structure (1000) exhibiting an optical effect having a transparent cover portion (200).

[0066] A structure (1000) exhibiting the above optical effect includes a base body (100) and a cover (200).

[0067] The above base body (100) has a pattern (110) formed on the surface.

[0068] The above pattern (110) can be formed on the entire surface of the base body (100), and can also be formed in a certain shape only on a portion of the surface of the base body (100). By using the above corrosion pattern (110), the area where the optical effect occurs can be limited, and the design for implementing the optical effect is very free.

[0069] In one specific example, the pattern (110) may be formed by imprinting from a mold. When the pattern (110) is formed by imprinting from a mold, it is easy to form the pattern (110) on the base body (100), and mass production is possible.

[0070] The above base body part (100) may be opaque, for example, may be made of an opaque synthetic resin that does not transmit light.

[0071] The above base body part (100) is made of an opaque synthetic resin and thus light may not be transmitted therethrough. Since the base body part (100) is made of an opaque synthetic resin and thus light may not be transmitted therethrough, light entering from the outside may be diffusely reflected from a pattern (110) on the surface of the base body part (100) after passing through the cover part (200).

[0072] In one specific example, the base body (100) may be made of at least one of polypropylene, polyethylene, polystyrene, ABS, and polycarbonate. The synthetic resin of the above type is easy to manufacture the base body (100) in a certain shape, and has high impact strength, so that the structure (1000) exhibiting an optical effect can be used as an exterior material for various items requiring protection from external impact, such as a mobile phone (10) case. In addition, the synthetic resin of the above type is thermoplastic and can be recycled, so it is very environmentally friendly, and the synthetic resin of the above type can form a pattern (110) of a certain depth using a mold, so that the manufacturing efficiency of the structure (1000) exhibiting an optical effect can be improved.

[0073] In one specific example, the base body portion (100) may have a glossy or semi-gloss surface.

[0074] The above base body part (100) has a corrosion pattern (110) on its surface, and may be a glossy finish or a semi-gloss finish with a low gloss depending on the depth of the corrosion pattern (110). Specifically, the gloss may be a gloss of about 4 to about 18 Gu (e.g., 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18 Gu) at an angle of about 80° using a gloss meter, and the semi-gloss may be a gloss of about 3 to 15 Gu (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 Gu) at an angle of about 80° using a gloss meter.

[0075] In the present invention, gloss and semi-gloss mean having a glossiness that allows light to be reflected from the pattern (110) on the surface.

[0076] When the base body (100) has a glossy or semi-glossy surface, the optical effect can be increased by increasing the diffuse reflection of light introduced from the corrosion pattern (110), and preferably, when it has a glossiness in the range of about 3 to about 18Gu (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18Gu), an optical effect such as pearl luster can be improved.

[0077] In one specific example, the base body portion (100) pattern (110) may have a depth measured by a three-dimensional surface roughness measuring device of about 2 μm to about 10 μm (e.g., 2, 3, 4, 5, 6, 7, 8, 9, or 10 μm), preferably about 2.3 μm to about 9.8 μm, and more preferably about 3.5 μm to about 3.7 μm.

[0078] The above pattern (110) is preferably formed by forming a predetermined pattern in a mold in advance and imprinting it on the base body (100), but the forming method is not limited as long as it is a method that can form the pattern (110) to a predetermined depth. When the depth is determined within the above range, the gloss of the pattern (110) can be adjusted to form a glossy or semi-gloss surface, and light entering from the outside can be scattered within the corrosion pattern (110) to generate diffuse reflection.

[0079] The above depth is measured using a three-dimensional surface roughness measuring device for the pattern (110), and when the corrosion depth is within the above range, the shape of the formed space itself is not particularly limited.

[0080] In one specific example, the base body portion (100) has an edge (120) having one or more curvatures, and the radius of curvature of the edge (120) can be determined according to the following equation 1.

[0081] [Formula 1]

[0082] 1.5T ≤ R ≤ 2.0T

[0083] In the above equation 1, R is the radius of curvature, and T is the thickness of the base body.

[0084] When the radius of curvature of the corner (120) of the base body (100) is determined according to the above formula 1, the focus at which light is reflected becomes different depending on the position of the surface of the curved surface, so that the diffuse reflection increases further, and some of the light is reflected again on the inner surface of the cover part (200), so that the sparkle on the surface of the cover part (200) increases, so that an optical effect such as a pearl effect can be effectively increased.

[0085] The above cover part (200) is provided in a shape that covers the entire base body part (100) and is placed at regular intervals on the base body part (100).

[0086] The cover part (200) can wrap around the entire base body part (100) so that external light can be reflected from the pattern (110) of the base body part (100) after passing through the cover part (200). Specifically, the cover part (200) can determine the path of light so that the external light reaches the pattern (110) on the surface of the base body part (100) through the cover part (200) by covering the entire base body part (100), and light passing through the cover part (200) can be diffusely reflected from the pattern (110) on the surface of the base body part (100).

[0087] The cover part (200) is spaced apart from the base body part (100) at a certain interval. Since the cover part (200) is spaced apart from the base body part (100) at a certain interval, the light passing through the cover part (200) can be reflected from the corrosion pattern (110) on the surface of the base body part (100) and then passing through the cover part (200) again until it reaches the surface of the cover part (200).

[0088] In one embodiment, the gap may be from about 0.1 mm to about 0.6 mm (e.g., 0.1, 0.2, 0.3, 0.4, 0.5 or 0.6 mm), preferably from about 0.2 mm to about 0.4 mm, and more preferably about 0.2 mm.

[0089] When the base body part (100) and the cover part (200) are spaced apart within the above range, the light incident on the cover part (200) is diffusely reflected from the pattern (110) and the optical path that reaches the cover part (200) is adjusted, so that an optical effect such as a pearl effect can be increased. In addition, within the interval within the above range, some of the light is reflected again from the lower portion of the cover part (200) and directed toward the base body part (100), thereby increasing the occurrence of diffuse reflection from the corrosion pattern (110) again, so that the optical effect can be amplified.

[0090] In one specific example, a protrusion is provided along the edge of the cover part (200), and a groove corresponding to the protrusion is formed in the base body part (100) so that the cover part (200) can be fastened and fixed to the base body part (100) while maintaining the spacing. In this case, as long as the cover part (200) can be fastened to the base body part (100) at a certain spacing, the fastening means is not limited.

[0091] The above cover part (200) can be manufactured from one or more synthetic resins among PC, PVC, PS, acrylic resin, PMMA, and ABS.

[0092] When the above cover part (200) is manufactured from the above type of synthetic resin, the transmittance increases, so that external light easily passes through the cover part (200) and reaches the base body part (100), causing diffuse reflection.

[0093] The cover portion (200) may exhibit a fluorescent color. Specifically, the cover portion (200) may emit light with a wavelength longer than the wavelength of the incoming light when light is transmitted therethrough. For example, the cover portion (200) may be provided with a fluorescent color, and the fluorescence may be determined based on the surface color of the base body portion (100).

[0094] In one specific example, the base body portion (100) and the cover portion (200) may have complementary colors.

[0095] The above base body part (100) is manufactured from synthetic resin so that consistent color development can be achieved. When the color of the base body part (100) is determined, the cover part (200) can be selected as a fluorescent color close to a color that is complementary to the color of the base body part (100). When the colors of the base body part (100) and the cover part (200) are complementary, the optical effect can be further amplified.

[0096] For example, the cover part (200) may be provided with a complementary color, and the complementary color may cause light incident from an external light to be reflected in a pattern (110) on the surface, and the fluorescent effect may be further amplified on the external surface due to complementary color interference.

[0097] In one specific example, the thickness of the cover portion (200) is preferably about 1 mm to about 2 mm (1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2 mm).

[0098] The light transmittance of the cover portion (200) can be controlled by determining the thickness of the cover portion (200) within the above range. Specifically, the cover part (200) may have a transmittance of about 70% to 90% (e.g., 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, or 90%) at a D65 light source using a haze meter at a thickness of 1 mm, and the cover part (200) may have a transmittance of about 59% to about 87% (e.g., 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, It can be 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, or 87%).

[0099] Within the above range, the thickness of the cover portion (200) is determined so that external light can pass through the cover portion (200), and when light is transmitted, a large amount of diffuse reflection can occur in the pattern (110) of the base body portion (100) according to the refractive index, and the optical effect can be observed more clearly from the upper portion of the cover portion (200), which is very desirable.

[0100] Meanwhile, even when the thickness of the cover portion (200) is outside the above range, if the transmittance of the cover portion (200) is about 70% to about 90% (for example, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, or 90%), after light is transmitted, diffuse reflection may occur in the corrosion pattern (110) of the base body portion (100), but it is difficult to maintain the impact strength of the cover portion (200) above a certain level, and the weight of the entire structure may increase due to the increase in thickness, which is not desirable.

[0101] In one specific example, the optical effect may be the same as that achieved by adding a pearl pigment to reflect light. Specifically, the optical effect may be the same as that achieved by adding a pearl pigment to a synthetic resin, whereby a metallic luster is observed on the surface, or a pearl luster is achieved by reflecting light and producing a sparkle.

[0102] Therefore, the structure (1000) exhibiting an optical effect according to the present invention is environmentally friendly because it does not use pearl pigments that cannot be recycled and may cause poor appearance and deterioration of physical properties, and can implement the same optical effect as when pearl pigments are applied by utilizing the physical properties of light transmission and diffuse reflection of thermoplastic synthetic resin.

[0103] Another aspect of the present invention relates to a mobile phone (10) case including a structure (1000) exhibiting the above optical effect.

[0104] Figure 4 shows the state of use of another mobile phone (10) case according to another specific example of the present invention.

[0105] Referring to FIG. 4, the case of the mobile phone (10) includes a structure (1000) exhibiting the optical effect, which has the same metallic luster as that of a pearl pigment applied thereto and a sparkle generated by light reflected at a certain angle, thereby enabling the exterior to be decorated in various ways and improving the visibility of the exterior. The base body (100) and cover (200) made of synthetic resin do not lower impact strength like pearl pigment, thereby effectively protecting the mobile phone (10) from external impact.

[0106] Another aspect of the present invention relates to a method for manufacturing a structure (1000) exhibiting the above optical effect.

[0107] FIG. 5 is a process flow diagram of a method for manufacturing a structure (1000) exhibiting an optical effect according to another aspect of the present invention.

[0108] Referring to FIG. 5, the method for manufacturing a structure (1000) exhibiting the optical effect includes a step of forming a pattern on the surface of a synthetic resin base body (100); and a step of arranging a cover part (200) at a predetermined interval from the base body (100).

[0109] First, the shape of the base body (100) is manufactured using synthetic resin, and a pattern is formed on the surface by imprinting with a mold (S100).

[0110] In the process of manufacturing the above-mentioned base body part (100) shape, it is possible to etch a pattern shape in advance on a mold and inject synthetic resin into the mold to form a pattern (110) on the surface of the base body part (100).

[0111] Afterwards, the cover part (200) is placed at a certain distance from the base body part (100) (S200).

[0112] The cover part (200) can be positioned at a certain interval from the base body part (100) so that external light can pass through the cover part (200) and cause diffuse reflection in the corrosion pattern (110) of the base body part (100), thereby exhibiting an optical effect.

[0113] In one specific example, the roughness and glossiness of the pattern (110) and the transmittance of the cover portion (200) can be adjusted, and as a result of the adjustment, the optical effect of the cover portion (200) can be increased, and specifically, the optical effect can be observed as a metallic gloss and light reflected and sparkling identical to that of a pearl pigment applied on the surface of the cover portion (200).

[0114] Therefore, a method for manufacturing a structure (1000) exhibiting an optical effect according to another aspect of the present invention excludes the complex process of dispersing and extruding or injecting pearl pigment, and injects a synthetic resin base body (100) to form a certain pattern (110), and arranges transparent material cover parts (200) at a certain interval to allow light to pass through and generate diffuse reflection, thereby manufacturing a structure (1000) exhibiting an optical effect such as a pearl effect.

[0115]

[0116] Hereinafter, preferred examples are presented to help understand the present invention, but the following examples are only to illustrate the present invention and the scope of the present invention is not limited to the following examples.

[0117]

[0118] Example

[0119] An opaque base body in the shape of a mobile phone case with a thickness of 8 mm was manufactured by injection molding polycarbonate resin into a mold in which a pattern of a certain depth was formed by mold etching. It was manufactured so that corners with a curvature radius of 12 mm were formed on both ends, and the base body was manufactured in a pink color by adding a dye. The pattern was formed so that the depth of the pattern was 2.3 μm to 10 μm, and the surface was manufactured to have micro-corrosion (Sample 2-1, depth 2.3 to 2.5 μm), fine corrosion (Sample 2-2, depth 3.5 to 3.7 μm), intermediate corrosion (2-3, depth 6.7 to 7.1 μm), and rough corrosion (Sample 2-4, depth 8.2 to 9.8 μm) depending on the corrosion depth.

[0120] A transparent cover part with improved transmittance was manufactured by using polycarbonate (PC) and adjusting the thickness to 1 mm to wrap around the entire base body part. At this time, the cover part was fixed to the base body part with a gap of 0.2 mm to complete a structure exhibiting a pearl effect. At this time, the cover part was adjusted to display yellow (Sample 1-1), green (Sample 1-2), green-blue (Sample 1-3), and blue (Sample 1-4) respectively by combining and adding dye pigments. In addition, the thickness of the cover part was adjusted to 1 mm and 2 mm, and the gap between the cover part and the base body part was changed from 0.1 mm to 0.6 mm.

[0121]

[0122] Comparative example

[0123] It was manufactured in the same manner as in the example, but the base body was made by adding 1% of pearl pigment to an opaque polyurethane synthetic resin, and was manufactured in the shape of a mobile phone case in the same manner as in the example.

[0124] The appearance of the manufactured molded product was visually confirmed to be free of flow marks and weld lines, and cosmetic defects were easily observed.

[0125]

[0126] Experimental Example 1. Cover Transmittance

[0127] In order to confirm the correlation between the implementation of the pearl effect according to the transmittance and the transmittance according to the thickness of the cover, the transmittance according to the thickness of the cover was measured.

[0128] Sample 1-1Sample 1-2Sample 1-3Sample 1-4Thickness (1mm) 88.4487.4078.8572.12Thickness (2mm) 86.8284.2369.0859.92

[0129] Table 1 above shows the transmittance of samples manufactured with cover portions having thicknesses of 1 mm and 2 mm, respectively, according to Example 1. The transmittance was obtained by measuring the amount of light transmitted through samples with thicknesses of 1.0 mm and 2.0 mm using a hazemeter under a D65 (CIE standard) light source.

[0130] When the thickness of the cover part was 1 mm, the transmittance was 70% to 90% in the samples, and when it was 2 mm, it was 59% to 87%. It was confirmed that the color concentration increased and the transmittance decreased as samples 1-1 to 1-4 went up, and it was confirmed that the transmittance decreased when the thickness increased even for the same color. Therefore, it was confirmed that the transmittance can be controlled depending on the combination and thickness of the added dye pigment.

[0131]

[0132] Experimental Example 2. Depth of Corrosion in the Base Body

[0133] The gloss of the pattern was measured to confirm the correlation between the effect of implementing the pearl effect and the gloss of the surface pattern of the base body.

[0134] Unit (㎛) Sample 2-1 Sample 2-2 Sample 2-3 Sample 2-4 Semi-glossy 2.5 3.7 6.7 8.2 Glossy 2.3 3.5 7.19.8

[0135] Table 2 above shows the depths of samples (2-1 to 2-4) when the corrosion pattern is a semi-gloss surface and a glossy surface. The depth of the corrosion pattern was measured using a 3D surface roughness measuring device (Keyence VK-X100). It was confirmed that the surface was formed as a semi-gloss surface or a glossy surface depending on the corrosion depth.

[0136]

[0137] Experimental Example 3. Checking the gloss of the base body

[0138] Unit (Gu) Sample 3-1 Sample 3-2 Sample 3-3 Sample 3-4 Semi-gloss 15853 Yu-gwang 181064

[0139] In the above Table 3, the glossiness of Samples 2-1 to 2-4 was measured and represented as Samples 3-1 to 3-4. The glossiness is a value obtained using a gloss meter based on 80°, and it was confirmed that the glossiness changes depending on the depth of the pattern on the surface. When the glossiness of each sample was 3 to 15 Gu based on 80°, it was determined to be semi-gloss, and when the glossiness was 4 to 18 Gu, it was determined to be glossy, and it was confirmed that an optical effect could be exhibited in semi-gloss or glossy.

[0140]

[0141] Experimental Example 4. Checking the spacing conditions

[0142] In order to confirm the correlation between the implementation of the pearl effect according to the gap between the base body and the cover, the gap between the base body and the cover was changed and whether the pearl effect occurred was confirmed.

[0143] Unit (mm) Sample 4-1 Sample 4-2 Sample 4-3 Sample 4-4 Interval 0.10.20.40.6

[0144] Table 4 above shows the gap between the base body and the cover part. By adjusting the gap from 0.1 to 0.6 mm using the cover part of sample 1-3 and the base body part of sample 2-2, it was confirmed whether an optical effect could be produced by changing the gap between the base body and the cover part.

[0145]

[0146] Experimental Example 5. Confirming Conditions for Implementing the Pearl Effect

[0147] According to Experimental Examples 1 to 4, the transmittance according to the thickness of the cover portion, the glossiness of the base body portion, the surface roughness of the pattern, and the gap between the cover portion and the base body portion were changed, and the synthetic resin structure in which actual pearl particles were introduced and a pearl effect was implemented according to the comparative example were visually compared to each other, and it was confirmed that the implementation conditions were correlated with the implementation of the pearl effect.

[0148] Classification Experimental Example 1 Experimental Example 2 Experimental Example 3 Experimental Example 4 Correlation Factor Cover Transmittance Corrosion Pattern Surface Roughness Base Body Gloss Cover and Base Body Spacing Optimal Range 70~90% 2.5㎛~ 10㎛ 3~18Gu 0.2~0.4mm

[0149] Table 5 above shows the correlation with the optical effect and the optimal range according to the experiment. Referring to Table 5, in Experimental Example 1, the transmittance changed depending on the thickness of the cover part, and it was confirmed that the pearl effect increased in the range of 70 to 90%. In Experimental Example 2, in the case of the corrosion pattern, the pearl effect increased in the range of surface roughness of 2.5 μm to 10 μm, and in particular, a very remarkable pearl effect could be observed in the range of 3.5 μm to 3.7 μm. In Experimental Example 3, it was confirmed that the pearl effect increased in the range of 3 to 18 Gu in both cases when the surface of the base body part of the sample according to Experimental Example 2 was glossy or semi-gloss. In addition, in Experimental Example 4, it was confirmed that the gap between the cover part and the base body part also had a correlation with the implementation of the pearl effect, and in particular, the pearl effect increased in the range of 0.2 to 0.4 mm. Therefore, it was confirmed that when the conditions according to Experimental Examples 1 to 4 are all satisfied within the optimal range, the optical effect observed on the surface of the cover part is amplified, and a pearl effect equivalent to that of the comparative example can be exhibited.

[0150]

[0151] Experimental Example 6. Confirming the Pearl Effect

[0152] FIG. 6 is a photograph of a structure exhibiting an optical effect according to one specific example of the present invention, FIG. 7 illustrates a case in which the base body part and the cover part have complementary colors in a structure exhibiting an optical effect according to one specific example of the present invention, and FIG. 8 is an enlarged photograph of a corner of a structure exhibiting an optical effect according to one specific example of the present invention.

[0153] Referring to Figs. 6 to 8, in the case of the embodiment, experimental examples 1 to 5 were satisfied, and in the case of Fig. 6, the colors of the base body part and the cover part were combined so that an apricot color was observed with the naked eye, thereby increasing the visibility and aesthetics of the appearance. It was confirmed that the manufactured base body part and the cover part could exhibit a pearl effect due to diffuse reflection under a certain light source even though no pearl pigment was applied, and it was confirmed that no flow mark or weld line occurred on the appearance compared to the comparative example, thereby confirming that the physical properties could also be improved.

[0154] Meanwhile, it was confirmed that when a corner with a curve is formed in the body part, the pearl effect is enhanced at the corner part.

[0155]

[0156] Experimental Example 7. Pearl Effect According to Complementary Color Relationships

[0157] Meanwhile, in order to confirm whether the optical effect is enhanced according to the complementary color relationship, in addition to the base body and cover part according to the embodiment, it was confirmed whether a pearl effect appears on the surface of the cover part when a close complementary color is selected as the complementary color relationship and the adjacent color of the complementary color.

[0158] Referring to Fig. 7, it was confirmed that the pearl effect was enhanced when the base body and the cover were selected in complementary colors or near complementary colors.

[0159]

[0160] Experimental Example 8. Confirming the Edge Pearl Effect

[0161] Referring to Fig. 8, when a strong external light is irradiated on a structure exhibiting an optical effect of the embodiment, it was confirmed that the pearl effect is enhanced by increasing the generation of sparkle, especially at the corners. This is because the radius of curvature within the corners is limited and the reflection angle changes according to the round shape of the corners, so that the diffuse reflection increases and the pearl effect can be further enhanced.

[0162]

[0163] Therefore, the structure exhibiting an optical effect according to the present invention can implement the pearl effect using a thermoplastic synthetic resin structure without using a non-recyclable pearl pigment, so it is not only environmentally friendly but also effectively prevents appearance defects and deterioration of physical properties due to the addition of pearl pigment.

[0164]

[0165] The present invention has been described with reference to exemplary embodiments. Those skilled in the art will appreciate that the present invention can be implemented in modified forms without departing from its essential characteristics. Therefore, the disclosed embodiments should be considered illustrative rather than limiting. The scope of the present invention is set forth in the claims, not the foregoing description, and all differences within the scope equivalent thereto should be construed as being encompassed by the present invention.

Claims

1. An opaque base layer having a pattern formed on the surface; and A transparent cover layer disposed on the above opaque base; The above opaque base layer and the above transparent cover layer do not contain pearl pigment, A structure with a pearlescent luster.

2. A structure having a pearl luster, wherein the opaque base layer and the transparent cover layer have complementary colors in the first paragraph.

3. A structure having a pearl luster, wherein the opaque base layer and the transparent cover layer are spaced apart from each other in the first or second paragraph.

4. A base body with a pattern formed on the surface; and It is provided in a shape that wraps around the entire base body, and includes a cover part that is spaced apart from the base body at regular intervals; A structure that exhibits an optical effect.

5. A structure exhibiting an optical effect, wherein the base body portion is opaque in the fourth paragraph.

6. A structure exhibiting an optical effect in accordance with claim 4 or claim 5, wherein the base body and the cover do not contain pearl pigment.

7. A structure exhibiting an optical effect, wherein the pattern is formed by imprinting from a mold according to any one of claims 4 to 6.

8. A structure exhibiting an optical effect, wherein the pattern has a depth of about 2 µm to about 10 µm as measured by a three-dimensional surface roughness measuring device in any one of claims 4 to 7.

9. A structure exhibiting an optical effect, wherein the base body has an edge having at least one curvature, and the radius of curvature of the edge is determined according to the following equation 1: [Formula 1] 1.5T ≤ R ≤2.0T In the above equation 1, R is the radius of curvature, and T is the thickness of the base body.

10. A structure exhibiting an optical effect in any one of claims 4 to 9, wherein the cover part covers the entire base body part and light scattered from the surface of the base body part is transmitted therethrough.

11. A structure exhibiting an optical effect according to any one of claims 4 to 10, wherein the cover part exhibits a fluorescent color.

12. A structure exhibiting an optical effect, wherein the thickness of the cover portion is about 1 mm to about 2 mm, according to any one of claims 4 to 11.

13. A structure exhibiting an optical effect according to any one of claims 4 to 12, wherein the cover portion has a transmittance of about 70% to about 90% when used with a D65 light source using a haze meter at a thickness of about 1 mm.

14. A structure exhibiting an optical effect according to any one of claims 4 to 13, wherein the gap is about 0.1 to about 0.6 mm.

15. A structure exhibiting an optical effect according to any one of claims 4 to 14, wherein the base body portion and the cover portion have complementary colors.

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