JP7144220B2 - Light transmissive resin sheet - Google Patents

Description

The present invention relates to a light-transmitting resin sheet.

Patent Document 1 proposes a light-transmitting conductive laminate in which at least a skin material and a transparent conductive base material are laminated in order from the input side. For example, when the light-transmissive conductive laminate is used to cover the surface of an in-vehicle touch switch, the switch is hidden by the skin material when the switch is not in use. On the other hand, when an action such as touching the surface of the skin material is performed, light is projected from the back of the switch, and the display part emerges and functions as a switch.

On the other hand, there is a demand for newer surface decoration technology for automotive interior products in order to respond to product differentiation and the diversification of user preferences.
For example, there is a demand for technology to decorate the surface of liquid crystal displays for car navigation systems and audio systems. When using a display, there is a demand for a technology that allows a person to visually recognize an image such as a still image or a moving image displayed on the liquid crystal display.
Therefore, it was considered to provide the light-transmissive conductive laminate described in Patent Document 1 so as to cover the surface of the liquid crystal display, for example.

Japanese Patent Application Laid-Open No. 2017-165100

However, since the skin material in the transmissive conductive laminate described in Patent Document 1 includes fabrics such as woven fabrics, knitted fabrics, and non-woven fabrics, the projection performance of light such as a backlight is poor, resulting in poor projection of light, for example, on a liquid crystal display. When viewed through the transmissive conductive laminate, an image such as a still image or a moving image captured by the film cannot be visually recognized to the extent that a person can recognize it.

Moreover, not only the liquid crystal display but also images such as still images and moving images projected by a projector, for example, are viewed through the transmissive conductive laminate described in Patent Document 1, and the projectability of the projector light deteriorates. , was not visible to the extent that a person could recognize it.

Therefore, for example, when the liquid crystal display or the projector is not used, the present invention presents a leather-like appearance, and when the liquid crystal display or the projector is used, the image such as a still image or a moving image projected on the liquid crystal display or the projector is displayed. An object of the present invention is to provide a light-transmitting resin sheet that can be visually recognized to a recognizable degree.

The light-transmitting resin sheet of the present invention is
A light-transmitting resin sheet made of a resin layer having a leather-like texture on the surface and not laminated with a fabric,
The thickness (t1) of the resin layer is 0.05 to 3.00 mm,
The drawing ratio of the leather-like drawing depth (t2) to the resin layer thickness (t1) is [(t2) / (t1)] × 100 = 0.47 to 38.82 (%). do.

For example, when the liquid crystal display or projector is not used, the light-transmitting resin sheet of the present invention exhibits a leather-like appearance, and when the liquid crystal display or projector is used, still images or moving images projected on the liquid crystal display or projector. The image can be visually recognized to the extent that a person can recognize it.

It is a figure explaining the evaluation method of the visibility in the Example of this invention. FIG. 4 is a diagram for explaining a method of measuring a leather-like drawing depth in an example of the present invention;

The present invention will be described in detail.
The light-transmitting resin sheet of the present invention is
Consists of a resin layer with a leather texture on the surface,
The thickness (t1) of the resin layer is 0.05 to 3.00 mm,
The drawing ratio of the leather-like drawing depth (t2) to the resin layer thickness (t1) is [(t2) / (t1)] × 100 = 0.47 to 38.82 (%). do.

[Light-transmitting resin sheet]
For example, when the liquid crystal display or projector is not used, the light-transmitting resin sheet of the present invention exhibits a leather-like appearance, and when the liquid crystal display or projector is used, still images or moving images projected on the liquid crystal display or projector. The image can be visually recognized to the extent that a person can recognize it.

[Resin layer]
The light-transmitting resin sheet of the present invention is composed of a resin layer having a leather texture on its surface.
Here, "having leather texture" means "having wrinkles resembling natural leather".
In order to obtain a resin layer having a leather-like texture on the surface, for example, a release paper having a texture pattern is coated with a resin, appropriately heated and dried, and then the release paper is peeled off to remove the resin layer. A method of transferring a leather-like tie pattern to the surface, or a method of imparting a leather-like tie pattern to the surface of the resin layer by embossing the obtained resin layer after forming the resin layer.

The thickness (t1) of the resin layer of the present invention is 0.05 to 3.00 mm.
When the thickness (t2) exceeds 3.00 mm, for example, an image such as a still image or a moving image projected on a liquid crystal display or a projector can be visually recognized by a person when viewed through the light-transmitting resin sheet. becomes difficult to do.
Further, if the thickness (t1) is less than 0.05 mm, the liquid crystal display or projector, for example, hidden by the light-transmitting resin sheet can be seen, and the leather-like appearance is spoiled.

The drawing ratio of the leather-like drawing depth (t2) to the resin layer thickness (t1) of the present invention is [(t2)/(t1)]×100=0.47 to 38.82 (%).
If the ratio of the depth (t2) of the leather-like drawing to the thickness (t1) of the resin layer exceeds 38.82 (%), for example, images such as still images and moving images displayed on a liquid crystal display or a projector When viewed through the light-transmitting resin sheet, it becomes difficult to visually recognize to the extent that a person can recognize.
Further, if the drawing ratio of the leather-like drawing depth (t2) to the resin layer thickness (t1) is less than 0.47, the leather-like appearance may be impaired.

Although the resin constituting the resin layer of the present invention is not particularly limited, vinyl chloride resin, urethane resin and the like are preferable.
When vinyl chloride resin is used as the resin constituting the resin layer, the thickness (t1) of the resin layer is preferably 0.10 to 3.00 mm.
Further, when urethane resin is used as the resin constituting the resin layer, the thickness (t1) of the resin layer is preferably 0.05 to 0.12 mm.

(vinyl chloride resin)
As vinyl chloride resins, polyvinyl chloride, copolymers of vinyl chloride monomers with other monomers that can be copolymerized, or blends of these resins can be used.
Other monomers copolymerizable with the vinyl chloride monomer include, for example, ethylene, propylene, vinyl acetate, vinylidene chloride, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester, maleic acid, acrylonitrile fumarate, and the like. is mentioned. Plasticizers for such vinyl chloride resins include dibutyl phthalate, diisobutyl phthalate, dioctyl phthalate, didodecyl phthalate, butyl benzyl phthalate, diisodecyl phthalate, dihexyl phthalate, diisononyl phthalate, dioctyl adipate, diisodecyl adipate, dibutyl sebacate, and dioctyl. Sebacate, tributyl phosphate, tricresyl phosphate, triphenyl phosphate, trichloroethyl phosphate, trioctyl phosphate, diphenyl cresyl phosphate.
In addition to the vinyl chloride resin, plasticizers such as trimellitate plasticizers, epoxy plasticizers, polyester plasticizers, and phthalate plasticizers may be blended singly or in combination. .
As for the mixing ratio of these plasticizers, an optimum ratio is appropriately selected according to the type of plasticizer. It is better to
In addition to the vinyl chloride resin and the plasticizer, if necessary, additives such as coloring agents such as pigments, stabilizers, antifouling agents, antifungal agents, lubricants, and flame retardants may be added. good.

(urethane resin)
The urethane resin may be either one-liquid type or two-liquid type.
In the case of one-liquid type, polyester-based aromatic isocyanate urethane, polyether-based aromatic isocyanate-urethane, polycarbonate-based aromatic urethane, polyester-based aliphatic isocyanate-urethane, polyether-based aliphatic urethane, polycarbonate-based aliphatic isocyanate-urethane, etc. are used. be able to.
In addition, cross-linking agents such as isocyanate compounds, epoxy compounds, aziridine compounds, carbodiimide compounds and oxazoline compounds, silane coupling agents, organic solvents and the like can be contained.

Moreover, in the case of the two-liquid type, for example, it may consist of a first liquid containing a polyol and a second liquid containing an isocyanate compound or a carbodiimide compound. Either one or both of the first liquid and the second liquid can contain a silane coupling agent, an organic solvent, an aqueous solvent, and the like.

The polyol contained in the first liquid is not particularly limited as long as it has two or more hydroxy groups. can be used.

Polyether polyols include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, glycerin, 1,1,1-trimethylolpropane, 1,2,5-hexanetriol, 1,3-butanediol, 1,4- Examples include polyols obtained by adding at least one selected from ethylene oxide, propylene oxide, butylene oxide, polyoxytetramethylene oxide, etc. to at least one selected from polyhydric alcohols such as butanediol and pentaerythritol. .

Polyester polyols include at least one selected from ethylene glycol, propylene glycol, butanediol pentanediol, hexanediol, glycerin, 1,1,1-trimethylolpropane, other low-molecular-weight polyols, glutaric acid, and adipic acid. , pimelic acid, suberic acid, sebacic acid, dimer acid, other low-molecular-weight aliphatic carboxylic acids and at least one selected from oligomeric acids; ring-opening polymers such as propionlactone and valerolactone. be done.

Other polyols include polymer polyols, polycarbonate polyols; polybutadiene polyols; hydrogenated polybutadiene polyols; acrylic polyols; is mentioned.

Further, the polyisocyanate contained in the second liquid is not particularly limited as long as it has two or more isocyanate groups. -bis(1-isocyanato-1-methylethyl)benzene, 1,4-bis(1-isocyanato-1-methylethyl)benzene, ω,ω'-diisocyanato-1,4-diethylbenzene, hexamethylene diisocyanate, tetramethylene Diisocyanate, 2-methyl-pentane-1,5-diisocyanate, 3-methyl-pentane-1,5-diisocyanate, lysine diisocyanate, trioxyethylene diisocyanate, isophorone diisocyanate, cyclohexyl diisocyanate, hydrogenated diphenylmethane diisocyanate, norbornane diisocyanate, hydrogenation Tolylene diisocyanate, hydrogenated xylene diisocyanate, hydrogenated tetramethylxylene diisocyanate, adducts of trimethylolpropane (TMP) and tolylene diisocyanate (TDI), adducts of TMP and 4,4'-methylenebis(cyclohexyl isocyanate) (HMDI) low molecular weight polyisocyanates such as polyols, adducts of TMP and HDI, adducts of TMP and IPDI, trimers of HMDI; A urethane prepolymer or the like, which is a reaction product obtained by reacting so as to be, can be used alone or in combination of two or more.
In addition to polyols and polyisocyanates, appropriate amounts of additives such as colorants such as pigments, stabilizers, antifouling agents, antifungal agents, lubricants and flame retardants may be added as necessary.

The light-transmissive resin sheet of the present invention should not be laminated with fabrics such as woven fabrics, knitted fabrics and non-woven fabrics. The reason for this is that the light transmittance deteriorates, and when using an LCD display or projector, for example, still images and moving images projected on the LCD display or projector cannot be seen to the extent that humans can recognize them. be.

In the light-transmitting resin sheet of the present invention, a surface-treated layer may be provided on the surface of the resin layer having the leather texture to improve touch and abrasion resistance. Moreover, you may provide a surface treatment layer through a primer layer as needed.

[Production method]
(Light transmissive resin sheet)
The light-transmitting resin sheet of the present invention can be produced, for example, by casting or calendering. Moreover, the obtained light-transmitting resin sheet may be subjected to surface treatment, if necessary.

(casting method)
In the casting method, a release paper is coated with a resin coating liquid for forming a resin layer, and the coating liquid is heated and dried as appropriate to form a resin layer.
Next, after appropriately heat-drying, the release paper is peeled off to obtain a light-transmitting resin sheet comprising a resin layer having a leather texture on the surface.

(calendar method)
In the calender method, a resin layer is formed with a calender molding machine so as to have a specified thickness.
Next, the obtained resin layer is passed through an embossing roll to obtain a light-transmitting resin sheet comprising a resin layer having a leather texture on the surface.

(surface treatment)
A coating liquid for a surface treatment layer may be coated on the surface of the obtained light-transmitting resin sheet having the leather trimming, and the surface treatment layer may be provided by heating and drying as appropriate.
Moreover, you may provide a surface treatment layer through a primer layer.
Specifically, a primer layer coating liquid is coated on a light-transmitting resin sheet, and the primer layer is formed by heating and drying as appropriate.
Next, the surface treatment layer may be provided by coating the obtained primer layer with the surface treatment layer coating solution and optionally drying by heating.
In addition, when forming a surface treatment layer or a primer layer, for example, a coater such as a reverse coater or a gravure coater can be used for coating.

The light-transmitting resin sheet of the present invention may be subjected to TOM (Three Dimension Overlay Method) molding using an apparatus such as that described in JP-A-2002-67137.
For the purpose of improving adhesion to the core material (molded product) during TOM molding, the side of the light-transmitting resin sheet of the present invention that comes into contact with the core material (molded product) is provided with an adhesive layer or an adhesive layer. An agent layer may be provided. Specifically, the light-transmitting resin sheet of the present invention may be coated with an adhesive or pressure-sensitive adhesive to provide an adhesive layer or pressure-sensitive adhesive layer, or may be laminated with an adhesive film or pressure-sensitive adhesive film. .
Further, as described in FIG. 6 of Japanese Patent Application Laid-Open No. 2002-67137, compressed air is supplied into the upper molding chamber from a compressed air tank in order to further adhere the light-transmitting resin sheet of the present invention to the core material. Alternatively, heated compressed air may be supplied into the upper molding chamber.

[Example 1]
(Manufacture of light-transmitting resin sheet)
For 100 parts by mass of vinyl chloride resin (manufactured by Shin Daiichi Vinyl Co., Ltd., trade name: ZEST PQHPN), a plasticizer (manufactured by CG Estar Co., Ltd., trade name: PL-200 (dialkyl phthalate (C9 to C11) ) and 1.00 parts by mass of a colorant (manufactured by Fuji Pigment Co., Ltd., trade name: FT54 (carbon black content: 20%)) were added and mixed with stirring to deaerate to obtain a paste mixture.
Then, the obtained paste mixed solution is spread on release paper (manufactured by Dai Nippon Printing Co., Ltd., trade name: DE-73) so that the dry thickness (thickness (t1) of the resin layer) is 0.05 mm. It was applied and heated at a temperature of 200° C. for 2 minutes for gelation (resinification) to form a resin layer.
After cooling, the release paper was peeled off to obtain a light-transmitting resin sheet.

[Example 2]
A light-transmissive resin sheet was obtained in the same manner as in Example 1, except that the colorant was changed to 2.60 parts by mass.

[Example 3]
A light-transmissive resin sheet was obtained in the same manner as in Example 1, except that the colorant was 5.00 parts by mass.

[Example 4]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.28 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.18 mm. got

[Example 5]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.72 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.18 mm. got

[Example 6]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 1.39 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.18 mm. got

[Example 7]
A light-transmitting resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.14 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.35 mm. got

[Example 8]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.37 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.35 mm. got

[Example 9]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.71 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.35 mm. got

[Example 10]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.10 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.50 mm. got

[Example 11]
A light-transmitting resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.26 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.50 mm. got

[Example 12]
The light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.50 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.50 mm. got

[Example 13]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.07 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.70 mm. got

[Example 14]
The light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.19 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.70 mm. got

[Example 15]
A light-transmitting resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.36 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.70 mm. got

[Example 16]
The light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.05 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 1.00 mm. got

[Example 17]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.13 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 1.00 mm. got

[Example 18]
The light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.25 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 1.00 mm. got

[Example 19]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.02 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 3.00 mm. got

[Example 20]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.04 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 3.00 mm. got

[Example 21]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.08 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 3.00 mm. got

[Comparative Example 1]
The light-transmitting resin sheet was prepared in the same manner as in Example 1, except that the colorant was 2.50 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.02 mm. got

[Comparative Example 2]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 6.50 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.02 mm. got

[Comparative Example 3]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 12.50 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 0.02 mm. got

[Comparative Example 4]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.01 part by mass and the dry thickness (thickness (t1) of the resin layer) was 4.50 mm. got

[Comparative Example 5]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.03 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 4.50 mm. got

[Comparative Example 6]
A light-transmissive resin sheet was prepared in the same manner as in Example 1, except that the colorant was 0.05 parts by mass and the dry thickness (thickness (t1) of the resin layer) was 4.50 mm. got

[Comparative Example 7]
For 100 parts by mass of vinyl chloride resin (manufactured by Shin Daiichi Vinyl Co., Ltd., trade name: ZEST PQHPN), a plasticizer (manufactured by CG Estar Co., Ltd., trade name: PL-200 (dialkyl phthalate (C9 to C11) ) and 1.00 parts by mass of a colorant (manufactured by Fuji Pigment Co., Ltd., trade name: FT54 (carbon black content: 20%)) were added and mixed with stirring to deaerate to obtain a paste mixture.
Then, the obtained paste mixed solution is spread on release paper (manufactured by Dai Nippon Printing Co., Ltd., trade name: DE-73) so that the dry thickness (thickness (t1) of the resin layer) is 0.50 mm. It was applied and heated at a temperature of 200° C. for 2 minutes for gelation (resinification) to form a resin layer.
Next, a polyester-based polyurethane resin for the adhesive layer (manufactured by Dainichiseika Kogyo Co., Ltd., trade name: Seikabond V-519UP) was applied onto the obtained resin layer so that the dry thickness was 50 μm. Immediately after that, a knitted fabric as a base fabric was bonded together and heated at a temperature of 120° C. for 2 minutes to obtain a laminate.
After cooling, the release paper was peeled off to obtain a light-transmitting resin sheet.

(Evaluation method and evaluation criteria)
For the light-transmitting resin sheets of Examples 1 to 21 and Comparative Examples 1 to 7, resin layer thickness (t1), leather tone drawing depth (t2), drawing ratio, transmittance, visibility, leather tone Appearance was evaluated and the results are shown in Table 1. The evaluation method and evaluation criteria are as follows.

[Thickness of resin layer (t1)]
The thickness (t1) of the obtained light-transmitting resin sheet was measured using a product (trade name: R1-205, manufactured by Ozaki Seisakusho Co., Ltd.).

[Leather drawing depth (t2)]
A test piece with a length of 20 cm and a width of 15 cm was prepared from the obtained light-transmitting resin sheet, and a surface roughness meter (manufactured by Mitutoyo Co., Ltd., trade name: : SJ-4000) was used to measure the leather-like drawing depth (t2). The measurement conditions were a scanning distance of 40 mm and a scanning speed of 1.0 mm/s.
As a result, in the light-transmitting resin sheets of Examples 1 to 21 and Comparative Examples 1 to 7, the leather-like drawing depth (t2) had a minimum value of 14.26 μm and a maximum value of 19.41 μm.
Therefore, the leather-like drawing depth (t2) is set to the range of 14.26 to 19.41 μm.

[Aperture ratio (%)]
Using the "thickness of the resin layer (t1)" and the "depth of drawing (t2)" obtained in the above measurement, the "depth of leather-like drawing (t2)" for the "thickness of the resin layer (t1)" The reduction rate” was calculated by the formula [(t2)/(t1)]×100. The "depth of drawing (t2)" was calculated using the minimum value and the maximum value.
For example, in the case of Examples 1 to 3, using "thickness of resin layer (t1) = 0.05 mm (50 µm)" and "minimum value of drawing depth (t2) = 14.26 µm", [drawing depth (t2)/thickness of resin layer (t1)]×100=[14.26/50]×100=28.52(%).
Subsequently, using "thickness of resin layer (t1) = 0.05 mm (50 µm)" and "maximum value of drawing depth (t2) = 19.41 µm", [drawing depth (t2) / resin layer Thickness (t1)]×100=[19.41/50]×100=38.82(%).
Therefore, the drawing ratio of the leather-like drawing depth (t2) to the resin layer thickness (t1) was in the range of 28.52 to 38.82 (%).
Also, for Examples 4 to 21 and Comparative Examples 1 to 7, the drawing ratio was calculated in the same manner.

[Transmittance]
The total light transmittance of the obtained light-transmitting resin sheet was measured using a haze meter (manufactured by Suga Test Instruments Co., Ltd., trade name: H2-V3). The measurement was performed under the condition that the light was incident from the side of the light-transmitting resin sheet on which the leather adjustment aperture was not formed.

[Visibility]
First, as shown in FIG. 1A, the obtained light-transmitting resin sheet is fixed to the focal length (34 cm) of a projector (TAXAN KG-PL021X: 300 lumens manufactured by Kaga Electronics Co., Ltd.).
Next, as shown in FIG. 1B, from the projector, background: orange (R, G, B = 255, 192, 0), characters: yellowish green (R, G, B = 146, 208, 80) "B" and "E" characters (
Character font: Arial, character size: 15, 20, 22, 25, 30 points, character size on the screen: 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm) are projected onto the light-transmissive resin sheet.
Next, as shown in FIG. 1A, an observer visually evaluated the visibility of characters from a position 1 m away from the light-transmitting resin sheet.
(Evaluation criteria)
・5: With a character size of 15, distinguish between “B” and “E” characters ・4: With a character size of 20, distinguish between “B” and “E” characters ・3: With a character size of 22, "B" and "E" can be distinguished ・2: Character size 25, "B" and "E" can be distinguished ・1: Character size 30, "B" and "E" distinguish between characters

[Leather look]
First, as shown in FIG. 1A, the obtained light-transmitting resin sheet is fixed to the focal length (34 cm) of a projector (TAXAN KG-PL021X: 300 lumens manufactured by Kaga Electronics Co., Ltd.).
Next, as shown in FIG. 1A, an observer visually evaluated the appearance of the obtained light-transmitting resin sheet from a position 1 m away from the light-transmitting resin sheet. The appearance of the light-transmitting resin sheet was visually evaluated without using a projector, that is, without projecting light from the projector.
(Evaluation criteria)
◯: The projector was concealed and a leather-like appearance was exhibited.
x: The projector could not be concealed, or the leather-like appearance was damaged.

The light-transmitting resin sheets of Examples 1 to 21 had a visibility evaluation of 4 or more, and also had excellent leather-like appearance.
Each sheet of Comparative Examples 1 to 3 has a thin thickness (t1) of each sheet (resin layer) and an excessively high aperture ratio, and as a result, the visibility evaluation is inferior at 1 to 3, and a projector is not used. In other words, each sheet cannot hide the projector when the projector light is not projected, and as a result, the leather-like appearance is spoiled.
In each sheet of Comparative Examples 4 to 6, the thickness (t1) of each sheet (resin layer) was large and the drawing ratio was too low, and each sheet (resin layer) with a uniform thickness was not obtained. The evaluation of the hardness was poor at 1 to 3, and the leather-like appearance was impaired.
The sheet of Comparative Example 7 had a leather-like appearance, but the visibility was evaluated as 1, which was poor.

Claims (1)

A light-transmitting resin sheet made of a resin layer having a leather-like texture on the surface and not laminated with a fabric,
The thickness (t1) of the resin layer is 0.05 to 3.00 mm,
The drawing ratio of the leather-like drawing depth (t2) to the resin layer thickness (t1) is [(t2) / (t1)] × 100 = 0.47 to 38.82 (%). A light-transmitting resin sheet.

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