JP2013010684A - Fingerprint stain-resistant substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a substrate having excellent fingerprint stain-resistance, that is a substrate where stains of fingerprints, etc. those adhered to the surface are hardly made conspicuous, and the adhered fingerprints are easily wiped by dry wiping by cloth etc., and even if it is time when the fingerprint component adheres to the wiping portion again, this fingerprint component is hardly made conspicuous.SOLUTION: The fingerprint stain-resistant substrate 1 is characterized by having a concave hole 3 which collects a fingerprint component that adheres to the smooth surface 2 by the capillary force at the part with which fingers are brought into contact of smooth surface 2 of the substrate 1 that has the optical transparency, the light reflectivity or the glossiness contacts, and sizes of the square root of the projected area in plan view of the hole 3 are 10-300 micrometers, the average depth of the hole 3 is 0.2-50 micrometers, and the distribution frequency of the hole 3 is 10-85% in area ratio.

Description

  The present invention relates to a substrate having excellent fingerprint stain resistance.

  BACKGROUND ART Base materials having light transmissivity, light reflectivity, or gloss such as glass, plastic, and metal are widely used as materials for electronic devices, automobile parts, buildings, and the like. Depending on the part of use, these base materials have many opportunities to be touched by human hands, so that dirt derived from living organisms such as fingerprints and sebum (hereinafter simply referred to as “fingerprint component”) can easily adhere to them. There was a property that could not be wiped off. Therefore, there is a problem that the attached fingerprint component and / or the fingerprint component that has not been completely wiped off are very noticeable, and the appearance of the substrate is remarkably impaired (hereinafter, simply referred to as “fingerprint contamination”). It was.

In order to solve the above problems, the surface treatment of the base material and the surface energy of the base material surface are reduced to make it difficult for the fingerprint component to adhere to the base material and to make it difficult to become familiar (hard to get wet). Attempts have been made to increase resistance to ingredients. For example, in Patent Document 1, a layer of a silicon-containing organic fluoropolymer represented by the following general formula (I) and having a number average molecular weight of 5 × 10 ² to 1 × 10 ⁵ is formed on the surface of a substrate. A characteristic antifouling substrate is described.

  Patent Document 2 discloses a method of imparting water / oil repellency to a substrate by processing the surface of the substrate to reduce surface energy. Specifically, at least one surface exhibits water / oil repellency, Or a glass substrate having a plurality of sets with different geometrical features having a concave structure to avoid a decrease in the contact angle of at least one droplet of oil .

  However, it is difficult to completely prevent the fingerprint component from adhering to the substrate. In recent years, as another approach to the above problem, it has been a challenge to make the fingerprint component less noticeable or familiar. For example, Patent Document 3 provides a stainless steel plate in which fingerprint components are hardly noticeable by randomly arranging a plurality of uneven structures on the surface of the stainless steel plate and forming a transparent organic resin film on the surface. In Patent Document 4, a specific fine structure is formed on a base material to diffuse a fingerprint component from the convex portion to the concave portion of the fine structure. In Patent Document 5, a layer having an uneven portion is used as a base material. Each of the methods has been disclosed to make it inconspicuous by guiding the fingerprint component into the recess.

JP 09-157582 A US Patent Publication No. 2010/0285272 JP 2004-136344 A US Patent Publication No. 2010/0033818 JP 2007-058162 A

  When the effect that the fingerprint component is easy to be familiar is given as in Patent Document 4 and Patent Document 5, the removability of the fingerprint component once attached may be inferior or not considered in comparison with the substrate that is “hard to attach the fingerprint component”. Is almost. If the fingerprint component that has entered the fine structure is likely to remain even after wiping with a cloth, etc., if the fingerprint component adheres again to the surface of the fine structure, the fingerprint component that can no longer be accommodated in the fine structure May be present in a large amount on the surface of the substrate, and the effect of making the fingerprint component less noticeable may be significantly impaired. Therefore, it is important that the fingerprint component once adhered is easily removed from the substrate surface including the fine structure by wiping with a cloth or the like. In the present invention, the fingerprint component is adhered by a fine structure different from the prior art. Provides a base material that does not stand out easily even if the fingerprint component does not stand out easily and the attached fingerprint component is easy to wipe off with dry cloth. The task is to do.

  The present invention provides a substrate having a concave hole that collects fingerprint components on the surface, thereby solving the above-mentioned problems.

  In the present invention, “fingerprint contamination resistance” means that the attached fingerprint component is not conspicuous, the attached fingerprint component is easily wiped off with a cloth, and the fingerprint component is again adhered to the wiped portion. Even if it exists, it means that the fingerprint component is not noticeable. An evaluation method of “anti-fingerprint stain resistance” will be described in Examples described later.

  The present invention has a concave hole that collects the fingerprint component adhering to the smooth surface by capillary force at the place where the finger of the smooth surface of the base material having light transmissivity, light reflectivity, or glossiness contacts. The square root size of the projected area of the hole in front view is 10 to 300 μm, the average depth of the hole is 0.2 to 50 μm, and the distribution frequency of the holes is 10 to 85 in terms of area ratio. %, A fingerprint-fouling resistant substrate.

  In addition, the present invention is the above-mentioned fingerprint resistant substrate, wherein the shape of the hole in a front view has 1 to 6 corners.

  Further, the present invention is the above-mentioned fingerprint stain-resistant substrate, wherein the distribution frequency of the holes in the fingerprint stain-resistant portion is 13 to 60% in terms of area ratio. The “fingerprint contamination resistant portion” referred to here is a portion to which fingerprint contamination resistance is desired to be imparted on the smooth surface of the substrate.

  Further, the present invention is characterized in that the hole is formed on a smooth surface of the base material by performing surface grinding or etching after performing a masking process corresponding to the shape of the hole. The above-mentioned fingerprint-fouling resistant substrate.

  The present invention also provides the fingerprint resistant substrate, wherein the smooth surface of the substrate is a top surface or a bottom surface of float glass.

  Further, the present invention is the above-mentioned fingerprint-resistant stain-resistant substrate characterized by having a water- and oil-repellent film on the substrate surface.

  According to the present invention, the attached fingerprint component is inconspicuous, and is a substrate that can be easily wiped off by dry wiping using a cloth or the like, and even when the fingerprint component adheres again to the wiped portion, the fingerprint component is inconspicuous A substrate can be provided.

The schematic diagram which looked at the base material which has multiple square holes in the base material surface by front view. Sectional drawing which showed one Embodiment of a part of a-a 'cross section in FIG. Sectional drawing which showed another embodiment of a part of a-a 'cross section in FIG. The schematic diagram of the state by which the fingerprint component was trapped in part or the whole of a hole. The projection figure of some shapes of a hole at the time of seeing the substrate surface of the present invention from the front. The projection figure of the fingerprint component trapped by the hole and a part of hole when the base-material surface of this invention is seen from the front. Sectional drawing which showed the b-b 'cross section in FIG. The optical micrograph for drawing substitutes showing a mode that the pseudo fingerprint was made to adhere to the base material which has the concave hole on the surface obtained in Example 2 of this invention. The optical microscope photograph of the substitute for drawing showing the mode after attaching a pseudo-fingerprint to the base material which has a concave hole on the surface obtained in Example 2 of this invention, and performing one wiping test. A state in which the pseudo fingerprint is attached to the substrate having a concave hole on the surface obtained in Example 2 of the present invention, and after performing a one-way wiping test, the pseudo fingerprint is reattached to the wiping portion. The optical micrograph of drawing substitutes to represent. The optical microscope photograph for drawing substitutes showing a mode that the pseudo fingerprint was made to adhere to the base material which has the concave hole on the surface obtained in Example 11 of this invention. The optical microscope picture for drawing substitutes showing the state after attaching a pseudo-fingerprint to the base material which has a concave hole on the surface obtained in Example 11 of this invention, and performing one wiping test. A state in which the pseudo fingerprint is attached to the substrate having a concave hole on the surface obtained in Example 11 of the present invention, and after performing a one-way wiping test, the pseudo fingerprint is reattached to the wiping portion. The optical micrograph of drawing substitutes to represent. The optical microscope photograph of the substitute for drawing showing a mode that the pseudo fingerprint was made to adhere to the base material (float glass which performed the water- and oil-repellent treatment) obtained by the comparative example 1 of this invention. An optical microscope instead of a drawing showing a state after a pseudo-fingerprint is attached to the base material (float glass subjected to water / oil repellent treatment) obtained in Comparative Example 1 of the present invention and a one-time wiping test is performed. Photo.

  The present invention provides a substrate that has holes on the surface for collecting attached fingerprint components and that can easily remove collected fingerprint components. As an embodiment of the present invention, as shown in FIG. 2, a concave hole 3 is formed with respect to the surface 2 of the base material 1 (hereinafter, the surface of the portion that is not a hole of the base material is referred to as “reference surface”). Some are directly formed. The fingerprint stain-resistant substrate of the present invention exhibits excellent fingerprint stain resistance because the fingerprint component is easily accommodated in the hole when the fingerprint directly contacts the reference surface. In addition, even when the substrate surface has a water / oil repellent film, when the fingerprint comes into contact with the water / oil repellent film on the reference surface, the same excellent fingerprint stain resistance is exhibited.

  The base material of the present invention is not particularly limited as long as it has light transparency, light reflectivity, or glossiness, and glass or plastic is preferable. Specifically, for example, glass made of soda lime silicate glass, aluminosilicate glass, quartz glass, alkali-free glass, and other various glasses can be used. In addition to glass, for example, plastics made of polyester, polyamide, polyacrylate, polyolefin, polycarbonate, polystyrene, polyurethane, polyvinyl alcohol, polyvinyl butyral, polyvinyl chloride, polyvinylidene chloride, and the like are also included. As the base material of the present invention, a base material having a smooth surface and the above-described holes formed on the surface is preferable. In this case, the portion where the hole is not formed, that is, the original smooth surface corresponds to the reference surface. Glass is preferred from the viewpoints of rigidity, wear resistance and scratch resistance.

  Further, as another embodiment, a composite base material of a film-like base material 5 in which a concave hole 3 is formed on the reference surface 2 and another base material 4 as shown in FIG. The term “film” includes concepts such as “film”, “sheet”, “plate”, “film” and “coating”). Examples of the film include a sol-gel film, a glass thin plate, or a polymer film, and specific materials include inorganic compounds such as silica, titania, alumina, zirconia, indium-containing tin oxide, antimony-containing tin oxide, aluminum, Metals such as tin, zinc, silver, gold, copper, platinum, nickel, cobalt, chromium, polyester, polyamide, polyimide, polyacrylate, polyolefin, polycarbonate, polystyrene, polyurethane, polyvinyl alcohol, polyvinyl butyral, polyvinyl chloride, polychlorinated Examples thereof include organic compounds such as vinylidene, silicone, cellulose resin, and fluorine resin, or organic-inorganic hybrid materials, and combinations thereof. The material of the substrate having a film is not particularly limited, and examples thereof include glass and plastic.

  The shape of the substrate is appropriately determined depending on the application. Preferably they are a sheet form and a film form.

  In the base material, it is not particularly limited whether the surface having the concave hole for collecting the fingerprint component is one side or both sides, or the whole or part of the base material surface. What is necessary is just to have the said hole in the part (henceforth only described as a "fingerprint stain-resistant part") which wants to provide the fingerprint stain resistance of the said base material, and should just determine suitably according to a use. In other words, if the hole is provided at a location where the finger comes into contact, fingerprint contamination resistance is effective. The reference surface of the substrate may be a flat surface or a curved surface.

  In the present invention, fingerprint contamination resistance can be obtained by having a concave hole on the smooth surface of the substrate. By having a concave hole, capillary force acts on the hole, and the fingerprint component is trapped in the hole. FIG. 4 shows the fingerprint component 6 trapped in a part or all of the hole 3. Since the fingerprint component trapped in this way is present in the hole as a collective droplet, it is visually observed. Less noticeable.

  In addition, from the viewpoint of easy wiping of the fingerprint component, since the droplets are collected in the hole, the fingerprint component is caused by the capillary force acting on the voids of the fiber of the cloth even in the case of dry wiping using a general-purpose cloth. The effect of being sucked up by the cloth is improved and can be easily wiped off. The cross-sectional shape of the hole is preferably flat at the bottom, as shown in FIGS. For example, when the bottom is V-shaped or dome-shaped, the fingerprint component accumulates in a narrow area at the bottom of the hole, and the capillary force acting on the area becomes larger than the capillary force acting on the fiber gap, making it difficult to wipe off the fingerprint component. Become. Further, since the fibers of the cloth are difficult to reach the bottom of the hole, it is difficult to wipe off the fingerprint component. Note that a general-purpose cloth such as a towel can be used for wiping, and a cloth with finer fibers such as a cloth for wiping glasses is preferable because it is easier to wipe off.

  When the hole does not exist, the fingerprint component adhering to the substrate does not generate a force to suck in the cloth direction from the small droplet size, and only moves the fingerprint component droplet. In addition, the droplet of the fingerprint component breaks up during the wiping process, and the droplet size further decreases, so the droplet size becomes a Mie scattering region, and the fingerprint wiping traces appear whitish due to the scattering characteristics. It looks like it detracts from the aesthetics of the substrate.

  The shape of the hole is not particularly limited as long as it is a shape that can be collected in a droplet in which fingerprint components are collected, but the shape of the hole in front view is preferably one having 1 to 6 corners. For example, as shown in FIG. 5, a shape having a single corner, a shape obtained by planar projection of a substantially teardrop shape, a shape having two angles, a shape obtained by planarly projecting a spindle type, a substantially triangular shape, a substantially rectangular shape, Although a substantially pentagon, a hexagon, etc. are mentioned, the shape of the curve which comprises each angle and shape is suitably determined by a use. A concave hole having 1 to 6 corners in the shape of the front view is suitable for the angle of the corner, so even with a small amount of fingerprint components, the fingerprint components are collected at the corners. The shape of is easier to wipe off with a cloth than a circle (see FIGS. 6 and 7). When there are seven or more corners, the angle per corner is large, and there is no difference in effect compared to the case where the shape of the hole in a front view is a circle. More preferred are those having 1 to 4 corners. More preferably, the shape of the hole in a front view is a substantially triangular shape or a substantially rectangular shape. As long as the property of collecting fingerprint components is not impaired, the shape of the corner may be r (arc-shaped) depending on the processing accuracy of the hole.

  The dimension of the hole (here, the dimension is “the square root of the projected area of the hole”) is 10 to 300 μm. If the size is less than 10 μm, the size of the hole is too small, so that it is difficult to contact the fingerprint component of the hole with a fiber of a general fingerprint wiping cloth, and it cannot be wiped unless it is a special one using ultrafine fibers. Problem arises. On the other hand, if it is larger than 300 μm, the capillary force acting on the hole is substantially lost. The shape and dimensions of the holes need not be uniform, and can be present on the surface of the substrate in any combination.

  The average depth of the holes (here, “depth” is the difference between the height of the reference surface and the height of the bottom of the hole, and is the length indicated by d in FIGS. 2 and 3). Although it can change suitably according to the use of the base material, it is 0.2-50 micrometers normally. If it is smaller than 0.2 μm, it will approach a flat state, and fingerprint stain resistance will not be obtained substantially. On the other hand, if it is larger than 50 μm, the cloth fibers often do not reach the bottom surface of the pattern when wiping with a cloth with a small force, resulting in poor wiping performance. More preferably, it is 0.5-20 micrometers.

  On the surface of the base material, the distribution frequency of the holes in the fingerprint-resistant stain resistant portion is 10 to 85% in terms of area ratio. The area ratio here is the ratio of the total area of the holes to the area of the rectangular area when a rectangular area is arbitrarily designated. If it is less than 10%, the fingerprint contamination resistance cannot be obtained substantially. If it is larger than 85%, it will be caught by the hole processed when wiping the cloth, and slipping will be worse. More preferably, it is 13 to 60%. Further, there may be a deviation in the distribution frequency of the holes, and a denser processing may be applied to a portion where the fingerprint attachment frequency is high.

  On the surface of the base material, the distance between the hole in the fingerprint-fouling-resistant part and the hole adjacent to the hole may be optimized according to the use of the base material and the shape of the hole, but is usually about 1 to 300 μm. And more preferably 10 to 100 μm. If it is narrower than 1 μm, the fibers of the cloth will be caught on the wall surface of the hole when wiping the cloth, so that the slippage will be unfavorable. The fingerprint component may remain as fine droplets, and the attached fingerprint component may be easily visible.

  The arrangement pattern of the holes on the substrate surface is preferably regular. When it is a regular pattern, for example, when it is used as a cover glass of a display, the visibility becomes high. On the other hand, if interference occurs between the pixel pitch and the pattern, moire occurs, which is not preferable. In that case, it is necessary to adjust the frequency of the pattern, that is, the distance between the patterns, or adjust the pattern so that it approaches an irregular arrangement. There is.

  The method for processing the shape of the hole on the surface of the base material is not particularly limited. In consideration of the characteristics of the base material to be obtained (optical characteristics, roughness of the processed surface, strength, etc.) Of these, a desired method may be selected. For example, a method of forming the hole on the smooth surface of the substrate by performing a masking process corresponding to the shape of the hole with a photoresist or the like and then performing surface grinding or etching such as a sand blast method. In addition, for example, a mold press molding method, a screen printing method, an ink jet printing method, an imprint method, and the like can be given.

  Further, the processed substrate may be provided with water / oil repellency using a surface treatment agent. Examples of surface treatment agents include commercially available perfluoropolyalkylene ether-modified silane Optool DSX (manufactured by Daikin Industries), KY-130 (manufactured by Shin-Etsu Chemical Co., Ltd.), Dow Corning 2634 (manufactured by Dow Corning Toray). Can be mentioned. Any surface treatment may be used as long as it is a generally known method, such as dip coating, hand coating, spraying, spin coating, flow coating, vapor deposition, brush coating, Examples thereof include a roll coating method, and further a method of performing drying (heat drying).

  Details will be described below, but the present invention is not limited to these examples.

[Example 1]
[Preparation of substrate]
A photoresist is applied on the top surface of a 100 mm square, 2 mm thick float glass substrate, exposed through a mask provided with the processing pattern shown in Table 1, and then developed and washed, followed by processing depth. Sand blasting was performed until the thickness became 5 μm. Thereafter, the resist is removed from the substrate and washed. As shown in Table 1, the shape of the hole in the front view is circular, and the dimension is 44 μm (the shape of the hole is a circle having a diameter of 50 μm. The square root of the projected area is calculated to be 44 μm.), A substrate having an average depth of 5 μm, a distribution frequency area ratio of 20%, and a distance between the hole and the hole adjacent to the hole is 50 μm.

[Fingerprint contamination resistance evaluation method]
The following (1) to (3) were performed as evaluation of fingerprint resistance of the obtained substrate.

(1) Pseudo-fingerprint adhesion test The end face of a 29 mm diameter silicone rubber plug is used as an artificial finger roughened with a base material Cw, abrasive material A, and abrasive paper of particle size P240 specified in JIS R6252, on an acrylic substrate. Quantitative pseudo-fingerprint adhesion test was conducted using oleic acid spin-coated with a thickness of 0.5 mm as an artificial fingerprint liquid. By artificially pressing an artificial finger against an acrylic substrate at 250 g / cm ² , the artificial fingerprint liquid is transferred to the artificial finger, and similarly at 250 g / cm ² against the substrate to be evaluated, the substrate is pressed vertically. A pseudo-fingerprint was attached to the surface. It was performed in the same manner as described above when pseudo fingerprints were again attached to the substrate after the wiping test described later.

(2) Pseudo-fingerprint wiping test Two towels of general-purpose towels 120 were fixed on the bottom surface of a metal cylinder having a diameter of 33 mm, and dry wiping was performed by reciprocating the pseudo-fingerprint adhering portion once with a load of 40 g / cm ² .

(3) Evaluation of anti-fingerprint contamination resistance The anti-fingerprint anti-fouling property for the base material after pseudo-fingerprint adhesion, the base material after pseudo-fingerprint wiping, and the base material after pseudo-fingerprint reattachment are as follows. evaluated.
1. Visual evaluation (after adhesion: ○ not noticeable, △ difficult to judge, × equivalent to unprocessed substrate; after wiping: ○ no fingerprint trace left, Δ fingerprint trace left, × fingerprint trace spread; after reattachment: ○ Inconspicuous, △ difficult to judge, × equivalent to unprocessed substrate)
2. Amount of change in haze (measured haze values before and after pseudo-fingerprint attachment, and determined the difference between the values (hereinafter referred to as “first-attachment haze change”). The haze value after the substrate and pseudo-fingerprint reattachment was measured, and the difference between the values was obtained (hereinafter referred to as “reattachment haze change”).
3. Observation with an optical microscope (the surface of the base material was observed after the pseudo fingerprint was attached, after the pseudo fingerprint was wiped off, and after the pseudo fingerprint was attached again.)

  The evaluation results of the base material of Example 1 are shown in Tables 2 and 3. Float glass with an area ratio of 20% distribution frequency, holes with dimensions of 44 μm and depth of 5 μm, the fingerprint marks after attaching the pseudo fingerprint are not visually noticeable, and the fingerprint marks after wiping are not visually observed I could not confirm. Furthermore, the fingerprint trace after the pseudo fingerprint was reattached to the wiped portion was not visually noticeable. Further, the change in initial haze was 4%, and the change in reattachment haze was 5%. Furthermore, when the surface of the base material on which the pseudo fingerprint was adhered was observed with an optical microscope, most of the fingerprint components were trapped in the holes, and it was confirmed that the fingerprint components existing on the reference surface were small. . In addition, when the surface of the base material after wiping off the pseudo-fingerprint was observed with an optical microscope, the fingerprint component was removed from the hole, and only a small amount of fine fingerprint component remained in the hole. It was confirmed that almost no fingerprint component remained on the reference surface. Furthermore, when the surface of the substrate after the pseudo fingerprint was reattached to the wiped portion was observed with an optical microscope, most of the fingerprint component was trapped in the hole, and the fingerprint component existing on the reference surface was slight. I was able to confirm. Thus, it was found that excellent fingerprint contamination resistance can be obtained by processing the above holes in the float glass. Furthermore, in the comparative example (Comparative Example 1) to be described later, the above-mentioned hole is high in fingerprint contamination resistance as compared with a base material in which the above-described hole is not processed and the float glass is only given water and oil repellency. It has been found that having an anti-finger is very effective in improving the resistance to fingerprint contamination.

[Examples 2 to 23]
After obtaining a substrate having holes shown in Table 1 in the same manner as in Example 1, perfluoropolyalkylene ether-modified silane (Dow Corning 2634: manufactured by Toray Dow Corning, Inc. or KY-130 shown in Table 1) : Shin-Etsu Chemical Co., Ltd.) 1 part by weight and fluorinated inert liquid (FC-3283: manufactured by Sumitomo 3M Co.) 500 parts by weight are mixed on the base material by dip coating, and the base material is at 150 ° C. By heating for 10 minutes, a base material imparted with water and oil repellency was obtained.

  Each evaluation result of the base materials of Examples 2 to 23 is shown in Tables 2 and 3. Anti-fingerprint stain resistance was confirmed on all the substrates of the examples. Taking the optical microscope observation of Example 2 as an example, as shown in FIG. 8, most of the pseudo-fingerprint attached to the base material is trapped in a hole in the base material surface, Only a few fingerprint components were present. Also, as shown in FIG. 9, after the one-way wiping test, the fingerprint component is removed from the hole, and the fine fingerprint component of the droplet remains slightly in the hole. It was confirmed that almost no fingerprint component remained. Furthermore, as shown in FIG. 10, most of the pseudo-fingerprints reattached to the wiping portion are trapped in the holes in the surface of the substrate, and the fingerprint component existing on the reference surface is very small. . Further, taking the optical microscope observation of Example 11 as an example, as shown in FIG. 11, most of the pseudo-fingerprints attached to the base material are trapped in holes formed on the base material surface, and are collected. It was a droplet and the fingerprint component present on the reference surface was very small. As shown in FIG. 12, the fingerprint component is almost removed from the hole after one reciprocation wiping test, the fingerprint component is hardly left on the reference surface, and the residual amount of the fingerprint component is extremely small. I was able to confirm. Furthermore, as shown in FIG. 13, the pseudo-fingerprint reattached to the wiping portion is trapped in the hole on the substrate surface, and is formed into a droplet, which is present on the reference surface. The fingerprint component to be performed was slight.

  In Example 13 and Example 16, the workability during wiping tended to be easily caught and slightly slippery. In all other examples, the workability during wiping was slippery and good.

[Comparative example]
A base material was obtained by imparting water and oil repellency to the glass substrate of one type of general-purpose float glass and two types of glass substrates obtained by processing the fine structure of the float glass in the same manner as in the examples. Details of the production conditions are shown in Table 1 as Comparative Examples 1-7.

  The respective evaluation results are shown in Tables 2 and 3. As in Comparative Example 1, with a base material that has only been subjected to a surface treatment for imparting water and oil repellency to the float glass, the fingerprint trace when the pseudo fingerprint is attached is not processed surface treatment. It was confirmed that there was no difference from the fingerprint trace in the case of the float glass, and the fingerprint trace after wiping spread on the surface of the base material and was not wiped off firmly. In addition, when the size of the hole is too small, sufficient anti-fingerprint resistance cannot be obtained (Comparative Example 2), and when the size of the hole is too large, sufficient anti-fingerprint resistance cannot be obtained (Comparative Example 3). . Also, when the depth of the hole is too small, sufficient anti-fingerprint resistance cannot be obtained (Comparative Example 4), and when the depth of the hole is too large, sufficient anti-fingerprint resistance cannot be obtained ( Comparative Example 5). Further, even when the hole distribution frequency is too low, sufficient anti-fingerprint resistance is not obtained (Comparative Example 6), and when the hole distribution frequency is too high, sufficient anti-fingerprint resistance is not obtained ( Comparative Example 7). As shown in FIGS. 14 and 15, the pseudo fingerprint attached to the float glass that has only been given water and oil repellency becomes a droplet on the substrate, and the droplet size decreases after one reciprocal wiping test. A large amount remained.

  The anti-fingerprint substrate of the present invention exhibits excellent anti-fingerprint contamination in an environment where a finger or the like is easily touched and a fingerprint component is easily attached. Specifically, architectural window glass and showcases (for store products, dolls, etc.), partition base materials and resin materials, decorative decorative plates, metal plates, furniture, electricity, electronic equipment (TVs, mobile phones) Excellent fingerprint resistance when used for display panels, touch panels, protective films, electrical and electronic equipment metal parts, resin coatings, mirrors, beverage bottles, beverage glasses, etc. for telephones, PCs, ATMs, photo plates, etc. Contamination can be imparted.

DESCRIPTION OF SYMBOLS 1 Base material 2 which has a hole Reference surface 3 of a base material Recessed hole 4 A base material which has a layer which has a hole 5 A layer which has a hole 6 A fingerprint component trapped in a part or all of a hole

Claims (6)

A concave hole that collects the fingerprint component adhering to the smooth surface by capillary force at a location where the finger of the smooth surface of the base material having light transmissivity, light reflectivity, or glossiness comes into contact with the hole. The dimension of the square root of the projected area in front view is 10 to 300 μm, the average depth of the holes is 0.2 to 50 μm, and the distribution frequency of the holes is 10 to 85% in area ratio Anti-fingerprint stain resistant substrate characterized by The fingerprint contamination-resistant substrate according to claim 1, wherein the shape of the hole in a front view has 1 to 6 corners. The fingerprint contamination-resistant substrate according to claim 1 or 2, wherein the distribution frequency of the holes in the fingerprint contamination-resistant portion is 13 to 60% by area ratio. The said hole is formed in the smooth surface of the said base material by performing the surface grinding or the etching after giving the masking process corresponding to the shape of this hole, The 1 thru | or characterized by the above-mentioned. The anti-fingerprint stain-resistant substrate according to claim 3. The fingerprint-resistant stain-resistant substrate according to any one of claims 1 to 4, wherein the smooth surface of the substrate is a top surface or a bottom surface of float glass. 6. The fingerprint-fouling-resistant substrate according to claim 1, further comprising a water / oil-repellent film on the surface of the substrate.