Light-transmissive skin material

Abstract

To provide a light-transmissive skin material having superior design characteristics.SOLUTION: A light-transmissive skin material has a skin layer with irregularities on its surface, the depth of the recesses being 50 μm or more and 75% or less of the thickness of the skin layer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a light-transmitting skin material. [Background technology]

[0002] A known technique involves attaching a light-transmitting skin material to cover an image display device such as a liquid crystal display (LCD) or a projector, allowing a viewer to see a still or moving image through the light-transmitting skin material when the image is displayed, and presenting the appearance of the light-transmitting skin material when the image is not displayed. For example, Patent Document 1 discloses a light-transmitting resin sheet that is made of a resin layer having a leather-like grain on its surface and is not laminated with any other fabric. The resin layer has a thickness (t1) of 0.05 to 3.00 mm, and the grain ratio of the depth (t2) of the leather-like grain to the thickness (t1) of the resin layer is [(t2) / (t1)] × 100 = 0.47 to 38.82 (%). Furthermore, in the light-transmitting resin sheet disclosed in Patent Document 1, the depth of the leather-like grain is 14.26 to 19.41 μm. [Prior art documents] [Non-patent literature]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-8712 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional light-transmitting skin materials have a problem in that they lack design potential in terms of the patterns formed by the unevenness on the surface. Therefore, an object of the present invention is to provide a light-transmitting skin material with excellent design potential. [Means for solving the problem]

[0005] As a result of intensive research to achieve the above-mentioned object, the inventors discovered that by specifying the depth of the irregularities formed on the surface within a predetermined range, it is possible to form patterns with excellent design properties using the irregularities, and have thus completed the present disclosure.

[0006] The present disclosure encompasses the following: <1> A light-transmitting skin material having a surface layer with irregularities on the surface, wherein the depth of the recesses in the irregularities is 50 μm or more and 75% or less of the thickness of the skin layer. <2> The 60° specular gloss of the surface of the skin layer measured in accordance with JIS Z 8741 (1997) is 5.0 or less. <1> The light-transmitting skin material according to claim 1. <3> The unevenness is one pattern or a combination of multiple patterns selected from the group consisting of a leather pattern, a geometric pattern, a fabric-like pattern, a wood grain pattern, a stone pattern, and a graphic pattern. <1> or <2> The light-transmitting skin material according to claim 1. <4> The surface of the skin layer is L before the heat resistance test in accordance with JIS D 0202 4.18 * a * b * value and post-test L * a * b * Color difference between the value (ΔE * ab) is 2.0 or less, <1> ~ <3> 10. The light-transmitting skin material according to any one of the above items. <5> In an abrasion test in accordance with JIS K 7204, the abrasion wheel is set to CS10, the load is set to 4.9 N, and the number of friction cycles is set to 1,000, and the recesses in the surface layer are maintained. <1> ~ <4> 10. The light-transmitting skin material according to any one of the above items. <6> The skin layer comprises a polyvinyl chloride resin. <1> ~ <5> 10. The light-transmitting skin material according to any one of the above items. <7> A surface treatment layer is provided on the surface of the skin layer. <1> ~ <6> 10. The light-transmitting skin material according to any one of the above items. <8> The surface treatment layer contains a polyurethane resin. <7> The light-transmitting skin material according to claim 1. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a light-transmitting skin material having an excellent design pattern due to the unevenness of the surface. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram schematically illustrating the unevenness of the surface layer of the light-transmitting surface material of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present disclosure will be described. These descriptions and examples are intended to illustrate the embodiment and are not intended to limit the scope of the invention. In the following embodiments, the components (including element steps, etc.) are not essential unless otherwise specified. The same applies to numerical values ​​and their ranges, and do not limit the present disclosure. For example, the present disclosure allows addition, omission, substitution, modification, etc. of the number, amount, position, ratio, material, configuration, type, order, etc., within the scope of the spirit of the present disclosure.

[0010] In the present disclosure, numerical ranges indicated using "to" include the numerical values ​​before and after "to" as the minimum and maximum values, respectively. In the numerical ranges described in stages in this disclosure, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in the numerical ranges described in this disclosure, the upper or lower limit value of that numerical range may be replaced with a value shown in the examples. In the present disclosure, each component may contain multiple types of corresponding substances. When multiple types of substances corresponding to each component are present in a composition, the content or amount of each component means the total content or amount of the multiple types of substances present in the composition, unless otherwise specified. In the present disclosure, the term "layer" includes cases where the layer is formed over the entire area when the area in which the layer exists is observed, as well as cases where the layer is formed over only a portion of the area.

[0011] The light-transmitting skin material of the present disclosure has a surface layer with irregularities, and the depth of the depressions in the irregularities is 50 μm or more and 75% or less of the thickness of the skin layer. As an example, as shown in Fig. 1, the light-transmitting skin material of the present disclosure has depressions with a depth of t1 formed in a skin layer with a thickness of t2. In other words, when t1 and t2 shown in Fig. 1 are used, the light-transmitting skin material of the present disclosure has depressions with a depth that satisfies 50 μm≦t1≦t2×0.75.

[0012] The lower limit of the depth of the recesses is preferably 80 μm or more, more preferably 100 μm or more, and the upper limit of the depth of the recesses is preferably 65% ​​or less of the thickness of the skin layer, more preferably 40% or less of the thickness of the skin layer.

[0013] The light-transmitting skin material of the present disclosure has excellent design properties when the depth of the recesses is specified within the above-mentioned range. The design properties can be evaluated by having multiple evaluators observe and judge the pattern formed by the recesses and projections on the skin layer in a state where light is not transmitted.

[0014] Although the depth of the recesses on the surface of the skin layer is specified as above, it is not necessary for all recesses present on the surface of the skin layer to fall within the above range; it is sufficient that the average depth of the recesses falls within the above range. The average depth of the recesses can be determined by measuring the depth of recesses at 10 locations within the surface of the skin layer and calculating the arithmetic mean from the measured values. Furthermore, recesses having the depth specified above should account for 60% or more of all recesses on the surface of the skin layer, preferably 70% or more, more preferably 80% or more, even more preferably 90% or more, and most preferably 95% or more.

[0015] The depth of the recesses in the unevenness is a value determined by the following method. First, a light-transmitting skin material including a skin layer on which unevenness is formed is cut in the thickness direction, and 10 recesses that appear on the cut surface are arbitrarily selected and the depth of each recess is measured. The depth of a recess is the length from the top of a protrusion to the bottom of the recess among the unevenness in the skin layer. The arithmetic mean value of the measurements for the selected 10 recesses is determined and used as the depth of the recess.

[0016] Furthermore, the light-transmitting skin material of the present disclosure preferably has a 60° specular gloss of 5.0 or less, measured on the surface of the skin layer in accordance with JIS Z 8741 (1997). In particular, the light-transmitting skin material of the present disclosure more preferably has a 60° specular gloss of 4.0 or less, even more preferably 3.0 or less, and even more preferably 2.0 or less. The lower limit of the 60° specular gloss may be 0.1 or more, and preferably 0.5 or more.

[0017] The light-transmitting skin material of the present disclosure has extremely excellent design properties because the depth of the recesses is specified within the above-mentioned range and the 60° specular gloss of the surface, measured in accordance with JIS Z 8741 (1997), is within the above-mentioned range.

[0018] The light-transmitting skin material of the present disclosure can have a variety of patterns on the surface of the skin layer due to the surface irregularities of the skin layer. While not particularly limited, the surface irregularities of the skin layer can form one or a combination of patterns selected from the group consisting of leather patterns, geometric patterns, fabric-like patterns, wood grain patterns, pebble patterns, and graphic patterns. In the light-transmitting skin material of the present disclosure, these patterns have excellent design properties due to the surface having recesses within the above-mentioned ranges.

[0019] The method for forming the unevenness on the surface of the skin layer in the light-transmitting skin material of the present disclosure is not particularly limited, and any known method can be used, including a method in which a skin layer is formed on a release paper having an uneven pattern, and a method in which a smooth surface of the skin layer is first formed, and then a squeezing roll or plate having an uneven pattern is brought into contact with the surface side of the skin layer to perform laminate embossing to form the uneven pattern on the skin layer.

[0020] The light-transmitting skin material of the present disclosure can have a reduction ratio calculated using the following formula of 10% or more, preferably 20% or more, even more preferably 30% or more, and even more preferably 40% or more. The reduction ratio can also be 75% or less, and can also be 70% or less. The reduction ratio can be calculated using the formula: reduction ratio = [(depth of recess) / (thickness of light-transmitting skin material)] × 100.

[0021] The light-transmitting skin material of the present disclosure preferably has not only excellent design but also heat resistance. For example, in the light-transmitting skin material of the present disclosure, the surface of the skin layer is preferably a L 100% or less before a heat resistance test in accordance with JIS D 0202 4.18. * a * b * value and post-test L * a * b * Color difference between the value (ΔE * In particular, in the light-transmitting skin material of the present disclosure, the color difference (ΔE * It is more preferable that ab) is 1.0 or less, even more preferable that it is 0.5 or less, and most preferable that it is 0.1 or less. JIS D 0202 4.18 describes that the heat resistance test method is to leave the part in a thermostatic chamber at 100±2°C for 1 hour, and then check for the occurrence of swelling, peeling, cracks, and other changes on the effective surface at room temperature.

[0022] The light-transmitting skin material of the present disclosure has a color difference (ΔE *By ensuring that ab) is within the above range, discoloration is prevented even when the film is used in a high-temperature environment such as inside a vehicle, and excellent design properties can be maintained.

[0023] Furthermore, the light-transmitting skin material of the present disclosure not only exhibits the above-described excellent design properties but also excellent abrasion resistance. The light-transmitting skin material of the present disclosure maintains the recesses in the skin layer in an abrasion test according to JIS K 7204, using a CS10 abrasion wheel, a load of 4.9 N, and 1,000 friction cycles. The maintenance of the recesses can be evaluated by an evaluator observing the unevenness of the skin layer after the abrasion test. Since the light-transmitting skin material of the present disclosure maintains the recesses even after the abrasion resistance test, it can maintain excellent design properties over a long period of time.

[0024] In particular, the light-transmitting skin material of the present disclosure preferably has a surface treatment layer on the uneven surface of the skin layer described above. By having a surface treatment layer, the light-transmitting skin material of the present disclosure has even better abrasion resistance and low gloss, and can maintain excellent design properties for a longer period of time.

[0025] The surface layer that constitutes the light-transmitting surface material of the present disclosure will be described in detail below. (epidermal layer) The surface layer in the light-transmitting surface material of the present disclosure is not particularly limited and can be formed from a synthetic resin. In particular, the surface layer preferably contains a polyvinyl chloride resin or a urethane resin.

[0026] -Polyvinyl chloride resin- The polyvinyl chloride resin contained in the skin layer is not particularly limited, and examples include those conventionally used in vinyl chloride leather, etc. Specifically, polyvinyl chloride resins with an average degree of polymerization of 1000 to 3000, preferably about 1000 to 1700, are preferred. Other polyvinyl chloride resins that can be used include copolymer resins based on vinyl chloride and ethylene, vinyl acetate, methacrylic acid ester, etc., and mixed resins of these resins with polyester resin, epoxy resin, acrylic resin, vinyl acetate resin, urethane resin, acrylonitrile, styrene-butadiene copolymer resin, partially saponified vinyl alcohol, etc.

[0027] -Urethane resin- The urethane resin contained in the surface layer is not particularly limited, and examples thereof include polyurethane resins that can be molded into a sheet. Examples of urethane resins include polycarbonate-based polyurethanes, polyether-based polyurethanes, polyester-based polyurethanes, and modified products thereof. Among these, polycarbonate-based polyurethanes are preferred from the viewpoint of better long-term durability.

[0028] -Other ingredients- In addition to the polyvinyl chloride resin or urethane resin as the main component, the skin layer may contain other components, such as known additives, as desired, as long as the effects of the present disclosure are not impaired. Examples of other components that the skin layer may contain include plasticizers, stabilizers, colorants, processing aids, and fillers. In particular, the skin layer preferably contains a plasticizer to improve the flexibility of the light-transmitting skin material. The content of the plasticizer is not particularly limited, but can be 30 to 80 parts by weight, and preferably 40 to 60 parts by weight, per 100 parts by weight of the polyvinyl chloride resin.

[0029] When a polyvinyl chloride resin is used, examples of the plasticizer include phthalate ester-based plasticizers such as diisodecyl phthalate, di-2-ethylhexyl phthalate, and diisononyl phthalate; fatty acid ester-based plasticizers such as dioctyl adipate and dioctyl sebacate; trimellitate ester-based plasticizers such as trioctyl trimellitate; triaryl phosphate ester-based plasticizers such as tricresyl phosphate and trixylyl phosphate; epoxy-based plasticizers such as epoxidized soybean oil; and polyester-based plasticizers such as polypropylene adipate.

[0030] The surface layer may also contain a colorant. The inclusion of a colorant can impart a desired hue to the surface layer. The colorant is not particularly limited, and can be appropriately selected from pigments, dyes, and the like. Examples of colorants include inorganic pigments such as titanium white (titanium dioxide), zinc white, ultramarine, cobalt blue, red iron oxide, vermilion, yellow lead, titanium yellow, and carbon black; organic pigments or dyes such as quinacridone, permanent red 4R, isoindolinone, Hansa Yellow A, phthalocyanine blue, indanthrene blue RS, and aniline black; metal pigments selected from the group consisting of metal flake powders such as aluminum and brass; and pearlescent pigments selected from the group consisting of titanium dioxide-coated mica and basic lead carbonate flake powder.

[0031] When the skin material contains a pigment, from the viewpoint of light transmittance and hiding power, the content of the pigment contained in the skin layer is preferably 0.015 to 0.135 parts by mass, and more preferably 0.030 to 0.1 parts by mass, relative to 100 parts by mass of the total solid content constituting the skin layer.

[0032] -Method for forming the epidermal layer- The surface layer can be formed using a known film-forming method. To form the surface layer, first, a surface layer-forming composition containing a polyvinyl chloride resin or a urethane resin and the above-mentioned components is prepared. Then, a film-like surface layer can be formed using the surface layer-forming composition using a known method. For example, when a polyvinyl chloride resin is used, the surface layer can be formed by molding the surface layer-forming composition into a sheet using a calendar method, a paste processing method, a melt extrusion method, or the like. When a polyurethane is used, the surface layer can be formed using a known coating method using the surface layer-forming composition, such as a knife coater method, a blade coater method, a roll coater method, a bar coater method, a curtain coater method, or a gravure coater method. In this case, a method may be used in which the surface layer-forming composition is applied to a release paper, the surface layer is dried, and then the surface layer is peeled off from the release paper.

[0033] -Thickness of the epidermis- The thickness of the skin layer is not particularly limited, but is preferably in the range of 300 μm to 550 μm, more preferably 350 μm to 500 μm, from the viewpoints of durability, transparency, etc. The thickness of the skin layer can be measured on a cross section obtained by cutting the dried skin layer in a direction perpendicular to the surface direction.

[0034] Next, a surface treatment layer that may be formed on the surface layer of the light-transmitting skin material of the present disclosure will be described in detail. (Surface treatment layer) The light-transmitting skin material of the present disclosure may have a surface treatment layer on the uneven surface of the skin layer. When the surface treatment layer is provided on the uneven surface of the skin layer, the light-transmitting skin material of the present disclosure has better abrasion resistance and low gloss of the surface, and can maintain excellent design properties for a long period of time.

[0035] The surface treatment layer contains at least a resin. Examples of resins that the surface treatment layer may contain include at least one selected from polyurethane resin, polyvinyl chloride resin, polyvinylidene chloride resin, acrylic resin, polyolefin resin, polyamide resin, silicone resin, and vinyl chloride-vinyl acetate copolymer. In particular, it is more preferable that the surface treatment layer contains a urethane resin from the viewpoint of further improving abrasion resistance. The surface treatment layer may be formed of one type of resin or two or more types of resins.

[0036] The surface treatment layer may also contain a crosslinking agent, an organic filler, an inorganic filler (e.g., silica particles), a lubricant, a flame retardant, an antioxidant, an antistatic agent, etc. For example, when the surface treatment layer is provided for the purpose of improving the tactile feel of the skin material, it may contain, as desired, organic particles as a filler as a tactile improver, a colorant for improving design, etc.

[0037] Furthermore, for the purpose of further improving abrasion resistance, a surface treatment layer containing a crosslinked structure can be formed. The surface treatment layer can be formed by applying a composition for forming a surface treatment layer containing the above-mentioned resin and optional components used as desired to the surface side of the surface layer having irregularities by a printing method. The method for forming the surface treatment layer can be the same as the method for forming the surface layer described above.

[0038] The thickness of the surface treatment layer is preferably in the range of 3 μm to 10 μm, more preferably in the range of 4 μm to 8 μm, from the viewpoint of improving the durability of the surface layer of the light-transmitting skin material and also of design. [Example]

[0039] The present disclosure will be described in more detail below using examples, but the technical scope of the present disclosure is not limited to the following examples.

[0040] [Example 1] (Process A: Epidermal layer formation) The following components were thoroughly mixed to obtain a composition for forming a surface skin layer having a solid content of approximately 100 parts by mass. In this example, a surface skin layer having a thickness of 355 μm was formed from the obtained composition for forming a surface skin layer using a calendering device.

[0041] Polyvinyl chloride resin (average polymerization degree 1000) 100 parts by mass Plasticizer (dialkyl phthalate) 40 parts by mass Stabilizer (Ba-Zn compound stabilizer) 5 parts by mass Colorant (carbon black) 0.067 parts by mass

[0042] (Step B: Forming a surface treatment layer) The following components were thoroughly mixed to obtain a composition for forming a surface treatment layer having a solid content of approximately 27.5 parts by mass. In this example, the obtained composition for forming a surface treatment layer was applied to the surface layer formed in step A in a wet coating amount of approximately 20 g / m 2 Next, the mixture was heated at 120° C. for 5 minutes using a hot air dryer to form a surface treatment layer (film thickness after drying: approximately 5 μm).

[0043] Two-component polycarbonate polyurethane resin (resin solid content 30% by mass) 100 parts by mass Crosslinking agent 4 parts by mass 5 parts by mass of water

[0044] (Step C: forming recesses) The surface treatment layer formed in step B was brought into contact with an embossing plate having projections and recesses, forming a laminate in which the surface layer, the surface treatment layer, and the embossing plate were laminated in this order. The embossing plate used in this example was made of silicone resin and had leather-like projections and recesses. Next, the laminate was placed in a hydraulic press and pressed at a temperature of 130°C and a pressure of 6 kgf / cm. 2 The laminate was then hot-pressed for 15 minutes. The embossing plate was then removed from the laminate, and a light-transmitting skin material was produced, comprising a surface layer with an irregular surface and a surface treatment layer. In the light-transmitting skin material (thickness: 360 μm) produced in this example, the recess depth was 85.58 μm and the drawing ratio was 23.77%. The drawing ratio was calculated by [(depth of recess) / (thickness of light-transmitting skin material)]×100.

[0045] [Example 2] A light-transmitting skin material was produced in the same manner as in Example 1, except that in step A, the colorant was used at 0.100 parts by mass, and in step C, a different embossing plate was used to set the recess depth to 122.39 μm and the drawing ratio to 34.00%.

[0046] [Example 3] A light-transmitting skin material was produced in the same manner as in Example 1, except that in step A the thickness of the skin layer was set to 415 μm, and in step C a different embossing plate was used to set the recess depth to 59.34 μm and the drawing ratio to 14.13%.

[0047] [Example 4] A light-transmitting skin material was produced in the same manner as in Example 1, except that the colorant was 0.037 parts by mass in step A, the thickness of the skin layer in step A was 505 μm, a different embossing plate was used in step C to make the recess depth 103.71 μm, and the drawing ratio was 20.34%.

[0048] [Example 5] A light-transmitting skin material was produced in the same manner as in Example 1, except that in step A the thickness of the skin layer was set to 515 μm, and in step C an embossing plate with geometrical irregularities was used to set the depth of the recesses to 228.87 μm, and the drawing ratio was set to 44.01%.

[0049] [Example 6] A light-transmitting skin material was produced in the same manner as in Example 1, except that in step A the thickness of the skin layer was set to 505 μm, and in step C an embossing plate with geometrical irregularities was used to set the depth of the recesses to 376.28 μm and the drawing ratio to 73.78%.

[0050] [Example 7] A light-transmitting skin material was produced in the same manner as in Example 1, except that in step A the thickness of the skin layer was set to 435 μm, and in step C an embossed plate with fabric-like recesses and protrusions was used to set the recess depth to 126.79 μm and the drawing ratio to 28.82%.

[0051] [Example 8] A light-transmitting skin material was produced in the same manner as in Example 1, except that in step A the thickness of the skin layer was set to 495 μm, and in step C an embossed plate with fabric-like recesses and protrusions was used to set the recess depth to 307.19 μm and the drawing ratio to 61.44%.

[0052] [Example 9] A light-transmitting skin material was produced in the same manner as in Example 1, except that the colorant was 0 parts by mass in step A, the thickness of the skin layer in step A was 335 μm, a different embossing plate was used in step C to set the recess depth to 59.97 μm, and the drawing ratio was 17.64%.

[0053] [Example 10] A light-transmitting skin material was produced in the same manner as in Example 1, except that the surface treatment layer was not formed in step B and the drawing ratio was set to 24.11%.

[0054] [Comparative Example 1] A light-transmitting skin material was produced in the same manner as in Example 1, except that in step C a different embossing plate was used, the recess depth was set to 19.00 μm, and the drawing rate was set to 5.27%.

[0055] [evaluation] The light-transmitting skin materials of Examples 1 to 10 and the light-transmitting skin material of Comparative Example 1 prepared as described above were evaluated in five categories: (1) design, (2) light transmittance, (3) visibility, (4) heat resistance, and (5) abrasion resistance.

[0056] (1) Design The design was evaluated by visually inspecting the surface appearance of the light-transmitting skin material. Specifically, 10 evaluators observed the surface design of the light-transmitting skin material without transmitting light from the back side of the material. The evaluation criteria were a comparison of the design of the light-transmitting skin material produced in Comparative Example 1, with an A being given if the light-transmitting skin material exhibited a superior appearance and a B being given if the light-transmitting skin material exhibited an equivalent appearance. Furthermore, for design, specular gloss was evaluated as follows: That is, the 60° specular gloss (=gloss value) of the textured surface of the light-transmitting covering material was measured using a micro-TRI-gloss (manufactured by BYK) in accordance with JIS Z 8741 (1997). The evaluation criteria were that a gloss value of 5.0 or less was considered to be satisfactory.

[0057] (2) Light transparency Light transmittance was evaluated as the total light transmittance (%) of the light-transmitting skin material. Specifically, measurements were performed using a Haze Computer HZ-1 (manufactured by Suga Test Instruments Co., Ltd.) under conditions where light was incident from the side (backside) opposite to the textured surface of the light-transmitting skin material. The total light transmittance (%) was calculated by [(transmitted light intensity) / (incident light intensity)]×100.

[0058] (3) Visibility Visibility was evaluated by visually inspecting the colors transmitted through the surface of the light-transmitting skin material. Specifically, 10 evaluators evaluated the colors displayed on the light-transmitting skin material with light transmitted through the back side of the material. More specifically, a rating of A was given if the colors displayed on the smartphone display were visible when viewed through the light-transmitting skin material (e.g., green and green), a rating of B was given if similar colors were visible when viewed through the light-transmitting skin material (e.g., green and yellow-green), and a rating of C was given if different colors were visible when viewed through the light-transmitting skin material (e.g., green and red).

[0059] (4) Heat resistance Heat resistance is measured by the L before and after the heat resistance test. * a * b * The difference in color value (ΔE * Specifically, the light-transmitting covering material was first cut into a test piece of 100 mm wide x 100 mm long, and the L before the test was measured using a spectrophotometer SP-64 (manufactured by X-Rite). * a * b *After that, the sample was left in a thermostatic chamber at 100±2°C for 1 hour as a heat resistance test in accordance with JIS D 0202 4.18, and then the L value after the test was measured using the same spectrophotometer. * a * b * The values ​​were measured. * ab=[(ΔL * ) 2 +(Δa * ) 2 +(Δb * ) 2 ] 1 / 2 The color difference was calculated based on ΔE * When ab is 2.0 or less, it is evaluated as having excellent heat resistance, and ΔE * When ab was greater than 2.0, the heat resistance was evaluated as poor.

[0060] (5) Abrasion resistance Abrasion resistance was evaluated by observing the recesses formed in the light-transmitting skin material after an abrasion test. Specifically, test specimens were prepared by cutting the light-transmitting skin material into circles with a diameter of 100 mm. The test specimens were subjected to an abrasion test in accordance with JIS K 7204, using a CS10 abrasion wheel, a load of 4.9 N, and 1,000 friction cycles. A Taber scratch tester (manufactured by Taber Industries) was used for the abrasion test. Ten evaluators visually inspected the test specimens after the test, rating them as A if the recesses were not lost, B if the recesses were slightly lost, and C if the recesses were completely lost.

[0061] [result] Table 1 shows the preparation conditions and test results for the light-transmitting skin materials of Examples 1 to 10 and the light-transmitting skin material of Comparative Example 1 in five categories: (1) design, (2) light transmittance, (3) visibility, (4) heat resistance, and (5) abrasion resistance.

[0062] As can be seen from Table 1, the light-transmitting skin materials of Examples 1 to 10 had superior design properties compared to the light-transmitting skin material of Comparative Example 1. In particular, it was revealed that the light-transmitting skin materials having a surface treatment layer can maintain excellent design properties for a longer period of time.

[0063]

Table 1

Claims

1. A light-transmitting skin material having a surface layer with irregularities on the surface, wherein the depth of the recesses in the irregularities is 50 μm or more and 75% or less of the thickness of the skin layer.

2. 2. The light-transmitting skin material according to claim 1, wherein the surface of the skin layer has a 60° specular gloss of 5.0 or less as measured in accordance with JIS Z 8741 (1997).

3. 2. The light-transmitting skin material according to claim 1, wherein the irregularities are one or a combination of patterns selected from the group consisting of a leather pattern, a geometric pattern, a fabric-like pattern, a wood grain pattern, a stone pattern, and a graphic pattern.

4. The surface of the skin layer is subjected to a heat resistance test in accordance with JIS D 0202 4.

18. ＊ a ＊ b ＊ value and L after the test ＊ a ＊ b ＊ The color difference (ΔE ＊ 2. The light-transmitting skin material according to claim 1, wherein ab) is 2.0 or less.

5. 2. The light-transmitting skin material according to claim 1, wherein the recesses in the skin layer are maintained in an abrasion test in accordance with JIS K 7204, in which the abrasion wheel is CS10, the load is 4.9 N, and the number of friction cycles is 1,000.

6. The light-transmitting skin material according to claim 1 , wherein the skin layer comprises a polyvinyl chloride resin.

7. The light-transmitting skin material according to claim 1 , further comprising a surface treatment layer on the surface of the skin layer.

8. The light-transmitting surface material according to claim 7 , wherein the surface treatment layer contains a polyurethane resin.

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