JP2014026259A - Molded article and front plate for display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molded article having a surface excellent in smoothness for fingers, which makes fingerprints or sebum depositing to the surface less visible, and having excellent image sharpness, and to provide a front plate for a display suitable for an electronic apparatus having a function of a touch panel.SOLUTION: A molded article has an uneven pattern on one major surface, the uneven pattern showing a surface roughness (Ra) of 0.002 to 0.1 μm, a ten-point average roughness (Rz) of 0.2 to 1 μm and an unevenness pitch (Sm) of 80 to 1,000 μm, and has a transmissive image clarity value of 75% or more for an optical comb width of 0.125 mm. A front plate for a display has an uneven pattern on one major surface, the uneven pattern showing a surface roughness (Ra) of 0.002 to 0.1 μm, a ten-point average roughness (Rz) of 0.2 to 1 μm and an unevenness pitch (Sm) of 80 to 1,000 μm, and has a transmissive image clarity value of 75% or more for an optical comb width of 0.125 mm.

Description

  The present invention relates to a molded article and a display front plate.

  In an image display device such as a liquid crystal display device, a touch panel has been developed in recent years, and finger slipping on the surface of the image display front plate is regarded as important. Examples of means for improving finger slipping include a method of imparting water repellency by imparting a water repellent component to the surface layer of the image display front plate.

  For example, Patent Document 1 has a hard coat layer having a specific fluorine-containing water-repellent component on the surface of a transparent substrate, and has excellent antifouling properties such as transparency, scratch resistance, fingerprint wiping property, and fingerprint visibility. Hard coat films have been proposed.

  However, although Patent Document 1 describes an improvement in antifouling property by imparting water repellency, nothing is said about finger slipping. Moreover, in patent document 1, since the fluorine-containing compound is used for the composition for hard-coat layer formation, it is disadvantageous at the surface of raw material cost. In addition to an increase in manufacturing cost when coating this, and when a sebum component adheres to the surface of the hard coat layer in Patent Document 1, wiping is easy, but fingerprint marks before wiping are conspicuous. As the frequency of rubbing with fabrics and the like increases, the water repellency of the hard coat layer is gradually lost.

Japanese Patent No. 4,273,362

  The object of the present invention is for a display suitable for an electronic device having a function of a molded product and a touch panel, which has excellent finger slipperiness, a surface on which attached fingerprints and sebum are inconspicuous, and excellent image sharpness. It is to provide a front plate.

The said subject is solved by the following this invention [1]-[4].
[1] Mainly concavo-convex shape with surface roughness (Ra) of 0.002 to 0.1 μm, 10-point average roughness (Rz) of 0.2 to 1 μm, and pitch (Sm) between concavo-convex of 80 to 1,000 μm. A molded product that has one of the surfaces and has an image clarity value of 75% or more in transmission at an optical comb width of 0.125 mm (hereinafter referred to as “the molded product”).
[2] The molded product according to [1], wherein the haze is 0.9% or less.
[3] Mainly concavo-convex shape with surface roughness (Ra) of 0.002 to 0.1 μm, 10-point average roughness (Rz) of 0.2 to 1 μm, and pitch (Sm) between concavo-convex of 80 to 1,000 μm. A display front plate having one of the surfaces and having an image clarity value of 75% or more in transmission at an optical comb width of 0.125 mm (hereinafter referred to as “the front plate for display”).
[4] The display front plate according to [3], wherein the haze is 0.9% or less.

  This molded product is excellent in finger slipperiness, has a surface on which attached fingerprints are not conspicuous, and has excellent image clarity, and is particularly suitable for a front panel for a high-definition display equipped with a touch panel function. .

Main molded product The main molded product has a surface roughness (Ra) of 0.002 to 0.1 μm, a 10-point average roughness (Rz) of 0.2 to 1 μm, and 80 to 1,000 μm on one of the main surfaces. It has a concavo-convex shape with a concavo-convex pitch (Sm).

In the present invention, the surface roughness (Ra), the 10-point average roughness (Rz), and the pitch between irregularities (Sm) are values represented by the following definitions.
<Surface roughness (Ra)>
The surface roughness (Ra) indicates the arithmetic average deviation of the absolute value of the distance from each peak or valley bottom to the reference line (average line) in the obtained roughness curve, and is a value obtained by the following formula (1). .

Ra = (y ₁ + y ₂ + y ₃ +... Y _n ) / n (1)
(Y _n is the reference line from the top or valley in n-th (the absolute value of the distance to the mean line), n represents the total number of peaks or valleys.)
<10-point average roughness (Rz)>
The 10-point average roughness (Rz) is the average distance from the top to the reference line (average line) from the highest peak to the fifth highest peak in the evaluation length of the obtained roughness curve, and the roughness Indicates the arithmetic mean deviation of the sum of the average distance from the five valley bottoms to the reference line (average line) from the deepest valley to the fifth deepest valley in the evaluation length of the curve, and is obtained by the following formula (2) It is.

Rz = | (P ₁ + P ₂ + P ₃ + P ₄ + P ₅ ) + (V ₁ + V ₂ + V ₃ + V ₄ + V ₅ ) | / 5
... (2)
(P _1-5 represents the distance from each peak to the reference line (average line), and V _1-5 represents the distance from each valley bottom to the reference line (average line).)
<Pitch between irregularities (Sm)>
The pitch between irregularities (Sm) is an average value of distances between adjacent peaks and valleys in the evaluation length of the obtained roughness curve, and is obtained by the following equation (3). Value.

(Smi represents the distance between the i-th mountain and valley, and n represents the number obtained by subtracting 1 from the sum of the mountain and valley existing in the evaluation length.)
When the surface roughness (Ra) of the surface having the irregular shape of the molded product is 0.002 μm or more, the slip property indicated by the surface having the irregular shape of the molded product is good, and is 0.1 μm or less, preferably 0.08 μm or less. Thus, the transparency of the molded product is improved.

  In addition, the 10-point average roughness (Rz) of the surface having the irregular shape of the molded product is 0.2 μm or more, preferably 0.3 μm or more, the slipperiness of the surface of the molded product, the masking property of the fingerprint, and the attached sebum The hiding and concealing properties of the molded product are good, and the transparency of the molded product is good when it is 1 μm or less, preferably 0.8 μm or less.

  Further, when the pitch (Sm) between the concave and convex surfaces of the molded product is 80 μm or more, preferably 130 μm or more, the transparency of the molded product is good, and the surface of the molded product is pointed to 1,000 μm or less. Property is improved.

  Although this molded product has the above-mentioned surface uneven shape on one of the main surfaces of the molded product, other main surfaces can also have an uneven shape including the above-mentioned surface uneven shape as needed. .

  Examples of a method for imparting a concavo-convex shape to the main surface of the molded product include a method of imparting a surface concavo-convex shape by irradiating the surface of the molded product with a carbon dioxide gas laser.

  This molded product has a transmissibility value of 75% or more in transmission at an optical comb width of 0.125 mm. By setting the image clarity value of the molded product to 75% or more, the image clarity of the molded product is improved. The image clarity value in transmission at an optical comb width of 0.125 mm is preferably 80% or more.

  The molded product preferably has a haze of 0.9% or less, and more preferably 0.7% or less in terms of transparency of the molded product. The haze of the molded product is preferably 0.1% or more because of the ease of manufacturing the molded product.

  Examples of the shape of the molded product include a sheet-like product.

  The thickness of the sheet-like material is preferably 0.5 to 10 mm from the viewpoint of the rigidity and handleability of the sheet-like material.

  Examples of the material constituting the molded product include resin materials such as acrylic resin, polycarbonate resin, polyester resin, and cellulose resin, and inorganic materials such as soda glass and chemically strengthened glass.

  As the resin material, a material having good transparency is preferable when used for the purpose of improving the visibility of the image display device, and an acrylic resin is preferable in terms of transparency and easy moldability.

  Examples of the acrylic resin include polymethacrylic acid esters such as polymethyl methacrylate and methacrylic copolymers mainly composed of methacrylic acid ester units such as methyl methacrylate.

  Specific examples of the methacrylic copolymer include a copolymer of methyl methacrylate and a copolymerizable vinyl monomer.

  Examples of the copolymerizable vinyl monomer include methyl acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, ( Isobutyl acrylate, t-butyl (meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) acrylic acid Examples include (meth) acrylic acid esters other than methyl methacrylate such as 2-hydroxyethyl, and aromatic vinyl monomers such as styrene.

  In the present invention, “(meth) acryl” means “acryl” or “methacryl”.

  In the present invention, functional layers such as a hard coat layer, an antistatic layer, and an antireflection layer can be laminated on the surface of the molded product according to the purpose.

  In the case where the molded product has the above-described functional layer, the surface uneven shape can be in a state of being imparted to the surface of the functional layer or the surface of the molded product including the functional layer.

  As a method of obtaining the molded product having the above functional layer, for example, a composition for forming a functional layer on the surface of a mold obtained by imparting an uneven shape to the surface of a film-like plastic substrate by embossing or the like There is a method of laminating the molded product after applying the product, then curing the composition for forming the functional layer, and then peeling the mold.

Further, as another method for obtaining the molded product having the functional layer, for example, after applying a composition for forming a functional layer on the surface of the molded product by a method such as spray coating or roll coating. A method for obtaining a molded product by curing a composition for forming a functional layer is mentioned.

Front plate for display The front plate for display has a surface roughness (Ra) of 0.002 to 0.1 [mu] m, a 10-point average roughness (Rz) of 0.2 to 1 [mu] m, and 80 to 1 on one of the main surfaces. It has a concavo-convex shape with a pitch (Sm) between concavo-convex of 1,000,000 m.

  When the surface roughness (Ra) of the surface having the concavo-convex shape of the front plate for display is 0.002 μm or more, the sliding property of the surface having the concavo-convex shape of the front plate for display is good, and is 0.1 μm or less, preferably When the thickness is 0.08 μm or less, the transparency of the front plate for display is improved.

  Further, when the 10-point average roughness (Rz) of the surface having an uneven shape of the front plate for this display is 0.2 μm or more, preferably 0.3 μm or more, the slipperiness of the surface of the front plate for display and the masking of fingerprints And the sequestration property of the attached sebum is good, and the transparency of the front plate for display is good at 1 μm or less, preferably 0.8 μm or less.

  Further, when the pitch (Sm) between the concave and convex surfaces of the front plate for the display is 80 μm or more, preferably 130 μm or more, the transparency of the front plate for the display is good, and before the display is used at 1,000 μm or less. The slipperiness indicated by the surface of the face plate is improved.

  The front plate for display has the above-mentioned surface uneven shape on one of the main surfaces of the front plate for display, but the uneven surface including the above-mentioned surface uneven shape on other main surfaces as necessary. Can have.

  Examples of the method for imparting a concavo-convex shape to the main surface of the front plate for display include a method of irradiating the surface of the front plate for display with a carbon dioxide laser to give the surface concavo-convex shape.

  The front plate for display has an image clarity value of 75% or more in transmission at an optical comb width of 0.125 mm. By setting the image clarity value of the front plate for display to 75% or more, the image clarity of the front plate for display is improved. The image clarity value in transmission at an optical comb width of 0.125 mm is preferably 80% or more.

  The front plate for display is preferably one having a haze of 0.9% or less, more preferably 0.7% or less, from the viewpoint of transparency of the front plate for display. The haze of the front plate for display is preferably 0.1% or more because of the ease of manufacturing the front plate for display.

  Examples of the method for imparting the concavo-convex shape to the main surface of the front plate for display include the same method as the method for imparting the concavo-convex shape to the main surface of the molded product.

  Examples of the front plate for display include a sheet-like molded product.

  The thickness of the front plate for display is preferably 0.5 to 2.0 mm from the viewpoint of rigidity and handleability of the front plate for display.

  Examples of the material constituting the front plate for display include resin materials such as acrylic resin, polycarbonate resin, polyester resin, and cellulose resin, and inorganic materials such as soda glass and chemically tempered glass.

  As the resin material, a material having good transparency is preferable when used for the purpose of improving the visibility of the image display device, and an acrylic resin is preferable in terms of transparency and easy moldability.

  As an acrylic resin, the thing similar to what is used for this molded article is mentioned.

  In the present invention, functional layers such as a hard coat layer, an antistatic layer, and an antireflection layer can be laminated on the surface of the front plate for display according to the purpose.

  When the front plate for display has the functional layer described above, the surface irregularity shape can be applied to the surface of the functional layer or the surface of the molded product including the functional layer.

  As a method of obtaining the display front plate having the above functional layer, for example, to form a functional layer on the surface of a mold obtained by embossing the surface of a film-like plastic substrate by embossing or the like. The method of laminating | stacking this display front board after apply | coating the composition of this, and then hardening the composition for forming a functional layer, and peeling a casting_mold | template after that is mentioned.

  Further, as another method for obtaining the front plate for the present display having the above functional layer, for example, a composition for forming the functional layer on the surface of the front plate for the present display is applied by a method such as spray coating or roll coating. A method of curing the composition for forming a functional layer after application to obtain the front plate for display is exemplified.

Hereinafter, the present invention will be described with reference to examples. In the following, “parts” and “%” indicate “parts by mass” and “% by mass”, respectively. Moreover, the abbreviation used shows the following.
C6DA: 1,6-hexanediol diacrylate (trade name, manufactured by Osaka Organic Chemical Industry Co., Ltd.)
TAS: Condensed ester of trimethylolethane, acrylic acid and succinic anhydride (trade name, manufactured by Osaka Organic Chemical Industry Co., Ltd.)
APO: Trimethylbenzoyldiphenylphosphine oxide (trade name, manufactured by BASF Japan Ltd.)
IRUGACURE 184: Hydroxycyclohexyl phenyl ketone (trade name, manufactured by Ciba Specialty Chemicals)
The obtained molded product was evaluated by the following method.
(1) Concave and convex shape The surface roughness (Ra), 10-point average roughness (Rz) and interconcave pitch (Sm) of the surface of the molded product were measured according to JIS B 0601 (1982).

A surface roughness meter (trade name: Surfcom 1400LCD, manufactured by Tokyo Seimitsu Co., Ltd.) was used for the above measurement. The measurement was performed under the following conditions.
Measuring element: 0102506 (tip R1 μm)
Measurement speed: 0.15 mm / sec (2) Image clarity The image clarity of the molded product was measured using an image clarity measuring instrument ICM-IDP (trade name, manufactured by Suga Test Instruments Co., Ltd.) and transmitted at an optical comb width of 0.125 mm. The image clarity value at was measured. The measurement was performed three times for each sample by shifting the sample direction by 45 degrees, and the average value was obtained.
(3) Haze The haze of the surface provided with the uneven shape of the molded product was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., trade name: HazeMatter NDH2000).
(4) Sliding property indicated The sliding property indicated on the surface of the molded product under the three test conditions A, B and C shown below was evaluated using the following indicators.
(A) Test condition A: A condition in which the surface of the molded product provided with the irregular shape was wiped with a waste cloth impregnated with methanol, and the surface of the molded product provided with the irregular shape was degreased.
(B) Test condition B: In the 50 mm square area of the surface of the molded product with the concavo-convex shape, rubbing the surface of the nose with the index finger, and applying sebum to the surface of the molded product with the concavo-convex shape. Conditions. The index finger was washed with a neutral detergent immediately before rubbing the nose surface and dried.
(C) Test condition C: About 1 mg of Nivea cream (trade name, manufactured by Kao Corporation) is placed on the index finger hara in the 50 mm square area of the surface of the molded product with the uneven shape, and the entire surface of the molded product The conditions were applied so as to be as thin and uniform as possible. The index finger was washed with a neutral detergent and dried immediately before applying Nivea cream.
A: The sliding property is very good, and the feeling of catching when the finger is sliding is not felt. ◯: Good sliding property, and there is a slight feeling of catching when sliding a finger.
(Triangle | delta): It cannot be said that the slipperiness to point out is favorable, and there exists a feeling of a finger catching.
X: The slipperiness to point is bad and the feeling of catching when sliding a finger is large.
(5) Fingerprint concealment The surface of the molded product with an uneven shape is contacted once with an index finger rubbed against the surface of the nose once with a load of about 50 g, and then quickly released, and the fingerprint of the contacted portion The hiding property was evaluated visually according to the following criteria.
(Double-circle): The concealment property of a fingerprint is very favorable, and a fingerprint trace is not recognized.
○: The fingerprint concealment is good, and very few fingerprint marks are observed.
(Triangle | delta): It cannot be said that the concealment property of a fingerprint is favorable, and a fingerprint trace is recognized.
X: The concealment property of the fingerprint is poor and the fingerprint trace is clearly recognized.
(6) Concealment of attached sebum The harassment of the index finger that rubbed the surface of the nose was contacted once with a load of about 50 g to the central part of the 50 mm square of the surface to which the uneven shape of the molded product was imparted, and quickly released. . Subsequently, the part to which sebum adhered was rubbed 5 times so as to wipe off with the same finger harassment, and the concealment property of the adhered sebum after the finger was released was visually evaluated according to the following criteria.
(Double-circle): The sebum concealment property is very favorable, and the wiping trace of sebum is not recognized.
○: The sebum is well concealed, and a slight trace of sebum wiping is observed.
(Triangle | delta): It cannot be said that sebum concealment property is favorable, and the wiping trace of sebum is recognized.
X: The sebum concealability is poor, and sebum wiping marks are clearly observed.
[Example 1]
Carbon dioxide gas laser (made by Universal Laser Systems, trade name: PLS6.) On one surface of an acrylic resin plate (Made by Mitsubishi Rayon Co., Ltd., trade name: Acrylite L # 001) having a length of 50 mm, a width of 50 mm and a thickness of 1 mm. 120D) was used to design and irradiate a solid image on the drawing software under the following irradiation conditions to produce a sheet-like molded product having an uneven shape on one of the main surfaces. Table 1 shows the evaluation results of the obtained molded product.
<Irradiation conditions>
Laser: Top
Mode: Last
Drawing Density (Image Density): 3
Laser output: 20% (4.8 W: laser output detection result using OPHIR power sensor F150A-BB-26PPS)
Laser irradiation speed: 100%
Laser resolution: 1,000 PPI

[Example 2]
A non-adhesive surface of a polyethylene terephthalate film (product name: A4100, manufactured by Toyobo Co., Ltd.) having a thickness of 188 μm was irradiated with a laser under the same irradiation conditions as in Example 1 using a carbon dioxide laser, and the surface was irradiated. A mold having surface irregularities having a surface roughness (Ra) of 0.06 μm, a 10-point average roughness (Rz) of 0.4 μm, and a pitch between irregularities (Sm) of 120 μm was provided.

  50 parts of C6DA, 50 parts of TAS, 2 parts of APO, and IRUGACURE on one surface of an acrylic resin plate (Mitsubishi Rayon Co., Ltd., trade name: Acrylite L) having a length of 50 mm, a width of 50 mm and a thickness of 1 mm An active energy ray-curable hard coat layer composition containing 2 parts of 184 was applied.

  The surface having the surface irregularities on the surface of the active energy ray-curable hard coat layer composition of the acrylic resin plate coated with the active energy ray-curable hard coat layer composition, and the surface having the irregular shape of the mold Were laminated so that they contacted each other.

Next, the active energy ray-curable hard coat layer composition is cured by irradiating the above laminate with ultraviolet rays from the mold side with an irradiation intensity of 200 mW / cm ² and an integrated light amount of 800 mJ / cm ² , thereby forming an uneven shape on the surface. A laminate having a hard coat layer having a thickness of about 10 μm was obtained. Subsequently, a hard coat layer having a thickness of about 10 μm is laminated on the surface of the acrylic resin plate of the laminate in the same manner as in the above method except that a mold having no unevenness is used, and hard surfaces are formed on both sides of the molded product. A molded product which was a laminate in which a coat layer was formed was obtained. Table 1 shows the evaluation results of the obtained molded product.
[Example 3]
A molded product having a concavo-convex shape on the surface was produced in the same manner as in Example 1 except that the irradiation conditions of the carbon dioxide laser were changed to the following conditions. Table 1 shows the evaluation results of the obtained molded product.
<Irradiation conditions>
Laser: Top
Mode: Last
Drawing Density (Image Density): 1
Laser output: 20% (4.8 W: laser output detection result using OPHIR power sensor F150A-BB-26PPS)
Laser irradiation speed: 100%
Laser resolution: 1,000 PPI
[Example 4]
A molded product having a concavo-convex shape on the surface was produced in the same manner as in Example 1 except that the irradiation conditions of the carbon dioxide laser were changed to the following conditions. Table 1 shows the evaluation results of the obtained molded product.
<Irradiation conditions>
Laser: Top
Mode: Last
Drawing Density (Image Density): 2
Laser output: 20% (4.8 W: laser output detection result using OPHIR power sensor F150A-BB-26PPS)
Laser irradiation speed: 100%
Laser resolution: 1,000 PPI
[Comparative Example 1]
A chemically tempered glass having a length of 50 mm, a width of 50 mm, a thickness of 0.7 mm, a tempered stress layer depth of 8 μm, and a surface stress value of 30 kgf / mm ² was used as a molded product. The evaluation results of this chemically strengthened glass are shown in Table 1.
[Comparative Example 2]
A molded product having a concavo-convex shape on the surface was produced in the same manner as in Example 1 except that the irradiation conditions of the carbon dioxide laser were changed to the following conditions. Table 1 shows the evaluation results of the obtained molded product.
<Irradiation conditions>
Laser: Top
Mode: Last
Drawing Density (Image Density): 5
Laser output: 30% (8.3 W: laser output detection result using power sensor F150A-BB-26PPS manufactured by OPHIR)
Laser irradiation speed: 100%
Laser resolution: 1,000 PPI
[Comparative Example 3]
A molded product having a concavo-convex shape on the surface was produced in the same manner as in Example 1 except that the irradiation conditions of the carbon dioxide laser were changed to the following conditions. Table 1 shows the evaluation results of the obtained molded product.
<Irradiation conditions>
Laser: Top
Mode: Last
Drawing Density (Image Density): 1
Laser output: 30% (8.3 W: laser output detection result using power sensor F150A-BB-26PPS manufactured by OPHIR)
Laser irradiation speed: 100%
Laser resolution: 1,000 PPI
[Comparative Example 4]
A molded product having a concavo-convex shape on the surface was produced in the same manner as in Example 1 except that the irradiation conditions of the carbon dioxide laser were changed to the following conditions. Table 1 shows the evaluation results of the obtained molded product.
<Irradiation conditions>
Laser: Top
Mode: Last
Drawing Density (Image Density): 2
Laser output: 30% (8.3 W: laser output detection result using power sensor F150A-BB-26PPS manufactured by OPHIR)
Laser irradiation speed: 100%
Laser resolution: 1,000 PPI
[Comparative Example 5]
A molded product having a concavo-convex shape on the surface was produced in the same manner as in Example 1 except that the irradiation conditions of the carbon dioxide laser were changed to the following conditions. Table 1 shows the evaluation results of the obtained molded product.
<Irradiation conditions>
Laser: Top
Mode: Last
Drawing Density (Image Density): 4
Laser output: 30% (8.3 W: laser output detection result using power sensor F150A-BB-26PPS manufactured by OPHIR)
Laser irradiation speed: 100%
Laser resolution: 1,000 PPI
[Comparative Example 6]
A molded product having a concavo-convex shape on the surface was produced in the same manner as in Example 1 except that the irradiation conditions of the carbon dioxide laser were changed to the following conditions. Table 1 shows the evaluation results of the obtained molded product.
<Irradiation conditions>
Laser: Top
Mode: Last
Drawing Density (Image Density): 1
Laser output: 10% (1.1 W: a laser output detection result using a power sensor F150A-BB-26PPS manufactured by OPHIR)
Laser irradiation speed: 100%
Laser resolution: 1,000 PPI
As is apparent from the results of Examples 1 to 4, the irregularity shape of the surface of the molded product satisfies the requirements for the surface roughness in the present invention, and the image clarity value in transmission when the optical comb width of the molded product is 0.125 mm. It can be seen that by making the shape such that the ratio is 75% or more, it has excellent finger slipperiness, has a surface on which attached fingerprints and sebum are inconspicuous, suppresses haze, and has excellent transparency. .

  On the other hand, as is clear from Comparative Example 1, if the uneven shape on the surface of the molded product does not satisfy the requirements for surface roughness in the present invention, finger slipping property, fingerprint concealing property and adhesion sebum concealing property are not sufficient. It was.

  Further, as is apparent from Comparative Examples 2 and 3, even when the uneven shape of the surface of the molded product satisfies the respective requirements for the surface roughness in the present invention, the molded product can be transmitted at an optical comb width of 0.125 mm. The finger slipperiness was not sufficient under the condition setting in which the image clarity value was less than 75%.

  Further, as is clear from Comparative Example 4, when Rz exceeds 1 μm as the concavo-convex shape on the surface of the molded product, the image clarity value in transmission at an optical comb width of 0.125 mm of the molded product is less than 75%, The finger slipperiness of the product was not sufficient.

  Further, as apparent from Comparative Example 5, when the surface roughness of the molded product is Sm smaller than 80 μm, the image clarity value in transmission at an optical comb width of 0.125 mm of the molded product is less than 75%. The finger slipperiness of the product was not sufficient.

  As is clear from Comparative Example 6, when Ra is less than 0.002 μm as the uneven shape on the surface of the molded product, the transparency is good, but the finger slipping property, the fingerprint concealing property and the attached sebum concealing property are good. Sex was not enough.

Claims (4)

  An irregular shape having a surface roughness (Ra) of 0.002 to 0.1 μm, an average roughness (Rz) of 0.2 to 1 μm, and a pitch between irregularities (Sm) of 80 to 1,000 μm A molded product having a transmission image value of 75% or more at an optical comb width of 0.125 mm.   The molded product according to claim 1, wherein the haze is 0.9% or less.   An irregular shape having a surface roughness (Ra) of 0.002 to 0.1 μm, an average roughness (Rz) of 0.2 to 1 μm, and a pitch between irregularities (Sm) of 80 to 1,000 μm And a display front plate having an optical comb width of 0.125 mm and an image clarity value in transmission of 75% or more.   The display front plate according to claim 3, wherein the haze is 0.9% or less.