JP5270810B1 - Cover glass for electronic equipment, manufacturing method thereof, and manufacturing method of touch sensor module - Google Patents

Abstract

This invention provides the cover glass for electronic devices which can improve durability remarkably compared with the antifouling coating surface by the conventional dip method.
The present invention is an electronic device cover glass 10 including a glass substrate 1 having a pair of main surfaces and an end face adjacent to the pair of main surfaces, and is provided on one main surface 1A of the pair of main surfaces. A glass surface to be processed is formed by performing glass surface modification processing in which a planar plasma processing and a downstream plasma processing are performed in this order. An antifouling coating layer 3 is formed on the glass treated surface and the end surface 1C.

Description

  INDUSTRIAL APPLICABILITY The present invention provides a display screen protection for a portable device such as a mobile phone, a portable game machine, a PDA (Personal Digital Assistant), a digital still camera, a video camera, or a slate PC (Personal Computer), or a display screen protection member. The present invention relates to a cover glass for an electronic device that is provided in a stacked manner and used as a further protective member, a method for manufacturing the same, and a method for manufacturing a touch sensor module.

  Conventionally, in order to protect a display screen of a mobile device such as a mobile phone, an acrylic resin plate having excellent transparency and light weight has been generally used. In recent years, touch-panel portable devices have become the mainstream, and there is a need to improve the strength of the display screen in order to support this touch panel function. Instead of conventional acrylic resin materials, glass materials with high strength even though they are thin Are increasingly being used. Furthermore, compared to conventional acrylic resin materials, glass materials have mechanical strength (scratch resistance, impact resistance), surface smoothness, protective properties (weather resistance, antifouling properties), appearance and luxury, It is advantageous in any respect.

A cover glass made of such a glass material is generally manufactured by the following process.
The glass material formed into a sheet is cut into a predetermined size by machining (cutting) or etching, and a glass substrate for cover glass is produced.
Next, necessary drilling or outer peripheral shape processing is performed on the glass substrate by machining or etching.

Next, a chemical strengthening process is performed on the glass substrate that has undergone the shape processing. This chemical strengthening treatment is a treatment method in which sodium Na ⁺ in glass is exchanged with potassium K ⁺ having a large ionic radius to form a compressive stress layer on the glass surface. The cover glass is required to have high strength because of impact and pressure.
Next, desired printing or the like is performed on the surface of the glass substrate subjected to the above chemical strengthening treatment.

  The cover glass thus completed is incorporated into a portable device. When a user uses a touch panel type portable device, the display screen is directly touched and operated, so that dirt such as fingerprints tends to adhere to the cover glass that protects the display screen. Therefore, it is desirable to prevent or suppress the dirt such as fingerprints from adhering to the cover glass, or to easily wipe off even if dirt such as fingerprints adheres. Therefore, the surface of the cover glass is usually subjected to an antifouling coating treatment. For example, Patent Document 1 discloses such antifouling coating treatment.

Special table 2011-510904 gazette

  Patent Document 1 discloses that the antifouling coating treatment is performed by a vapor deposition method or an immersion method. However, when the antifouling coating treatment is performed by the vapor deposition method or the dipping method, the adhesion between the glass substrate and the antifouling coating material is insufficient depending on the surface roughness of the surface of the glass substrate, and the antifouling coating layer. In some cases, the desired durability could not be obtained.

In addition to this, the antifouling coating treatment is generally performed by a vapor deposition method as shown in Patent Document 1 above. However, when the vapor deposition method is used for the antifouling coating process, it is necessary to perform the process one by one in the film forming chamber, so that there is a problem that the productivity is poor and the manufacturing cost is increased as a result.
Further, Patent Document 1 also discloses an antifouling coating treatment by a dip method (dipping method). However, although not disclosed in Patent Document 1, according to the study of the present inventor, the antifouling coating surface formed by the dip method is inferior in durability to the antifouling coating surface formed by the vapor deposition method. It turned out that there was a problem.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a cover glass for an electronic device that can remarkably improve the durability as compared with a conventional antifouling coating surface by a dip method. And a method of manufacturing the same. Another object is to provide an electronic device cover glass and a method for manufacturing the same, which can improve productivity as compared with an antifouling coating treatment by a vapor deposition method. Furthermore, another object is to provide a method for manufacturing a touch sensor module including a glass substrate with improved durability of the antifouling coating surface and improved adhesion stability of a transparent conductive layer or the like.

  As a result of intensive studies to solve the above problems, the present inventor has found the following contents regarding the durability of the antifouling coating surface. Regarding the surface properties of the glass substrate subjected to the antifouling coating treatment, when the skewness (Rsk: skewness) of the contour curve of the glass substrate surface is relatively far from 0, the unevenness of the unevenness of the glass substrate surface is large. The adhesion stability of the antifouling coating layer applied to the glass substrate to the glass substrate was low. And it became clear that this adhesion stability has influenced the durability of the antifouling coating surface.

  Therefore, as a result of further research by the present inventors, the glass substrate surface is modified so that the skewness (Rsk: skewness) of the contour curve of the glass substrate surface approaches zero by performing a planar plasma treatment on the glass substrate. It was confirmed that the unevenness of the uneven shape on the surface of the glass substrate was reduced. As a result, it was confirmed that the adhesion stability of the antifouling coating layer to the glass substrate was increased.

  However, it was also confirmed that the adhesion stability of the antifouling coating layer to the glass substrate was insufficient only by the planar plasma treatment. Therefore, as a result of further research by the present inventors, functional groups such as OH groups and COOH groups are formed on the surface of the glass substrate by performing downstream plasma processing on the surface of the glass substrate subjected to planar plasma processing. Is formed. And it is thought that the adhesion stability with respect to the glass substrate of an antifouling coating layer is increasing more by the coupling | bonding of this functional group and antifouling coating material.

As described above, the present inventor sufficiently adheres the antifouling coating layer to the glass substrate by performing the glass surface modification treatment for performing the planar plasma processing and the downstream plasma processing in that order on the glass substrate. I found that it can be enhanced. And the inventor found that the durability of the antifouling coating surface can be improved by sufficiently increasing the adhesion stability of the antifouling coating layer to the glass substrate, that is, the above problem can be solved, and the present invention It came to complete.
Moreover, even when a highly productive dip method is used for the coating method, the adhesion stability of the antifouling coating layer to the glass substrate can be sufficiently increased, and the durability of the antifouling coating surface can be improved. I found a possible point.

That is, the present invention has the following configuration.
(Configuration 1)
A method of manufacturing a cover glass for an electronic device comprising a glass substrate having a pair of main surfaces and an end surface adjacent to the pair of main surfaces, wherein one main surface of the pair of main surfaces of the glass substrate A glass surface modification treatment for performing a planar plasma treatment and a downstream plasma treatment in that order to form a glass treated surface, and a step of forming the glass treated surface, And a step of forming an antifouling coating layer on the treated surface.

(Configuration 2)
In the step of forming the antifouling coating layer, the antifouling coating layer is formed on the entire outer surface of the glass substrate including the glass treated surface by immersing the entire glass substrate in an antifouling coating material. It is a manufacturing method of the cover glass for electronic devices of the structure 1.
(Configuration 3)
The antifouling coat layer formed on the other main surface of the pair of main surfaces is subjected to an antifouling coat surface modification treatment that reduces the contact angle of water on the surface, and the antifouling coat modification is performed. It is a manufacturing method of the cover glass for electronic devices of the structure 1 or 2 characterized by including the process of forming a layer.

(Configuration 4)
The method for manufacturing a cover glass for an electronic device according to any one of configurations 1 to 3, further comprising a step of performing printing on the glass substrate, which is performed before the step of forming the glass processing surface. is there.
(Configuration 5)
A printing region protection layer for protecting the alteration of the printing region on the surface of the glass substrate until the printing is performed is provided before the printing is performed on the surface of the glass substrate, and the printing region protection layer is provided when the printing is performed. The method for producing a cover glass for an electronic device according to Configuration 4, wherein the surface is modified or removed in order to reduce the contact angle of water on the surface.

(Configuration 6)
The electronic device cover according to Configuration 4 or 5, wherein when the printing is performed, a contact protection layer for protecting the glass substrate from contact with a printing machine or a jig thereof is provided in advance on the glass substrate. It is a manufacturing method of glass.

(Configuration 7)
A cover glass for an electronic device comprising a glass substrate having a pair of main surfaces and an end surface adjacent to the pair of main surfaces, wherein Rsk of one main surface of the pair of main surfaces is 0 ± 0. 3 and an antifouling coating layer is formed on the one main surface, and # 0000 steel wool is slid 2000 times at a surface pressure of 1 kg / cm ² on the surface of the antifouling coating layer. A cover glass for electronic equipment, wherein when contacted, the contact angle of water on the surface of the antifouling coating layer is 105 degrees or more.

(Configuration 8)
The antifouling coating layer is a cover glass for an electronic device according to Configuration 7, wherein the antifouling coating layer has an adhesion region attached to the surface of the glass substrate and a flow region disposed on the surface of the adhesion region. .
(Configuration 9)
The cover glass for an electronic device according to Configuration 8, wherein a ratio of the thickness of the adhesion region to the thickness of the antifouling coating layer is 40% to 70%.

(Configuration 10)
On the other main surface of the pair of main surfaces, there is an antifouling coat modified layer formed by subjecting the antifouling coat layer to an antifouling coat surface modifying treatment for reducing the contact angle of water on the surface. The contact angle of water on the surface opposite to the glass substrate of the antifouling coating layer formed on the one main surface is in the range of 110 to 120 degrees, and the other The contact angle of water on the surface opposite to the glass substrate of the antifouling coating modified layer formed on the main surface is 20 degrees or less, according to any one of configurations 7 to 9, It is a cover glass for electronic equipment.

(Configuration 11)
The contact angle of hexadecane on the surface opposite to the glass substrate of the antifouling coating layer formed on the one main surface is in the range of 60 degrees to 70 degrees, and is formed on the other main surface. The cover glass for electronic equipment according to Configuration 10, wherein the contact angle of hexadecane on the surface of the antifouling coat modified layer opposite to the glass substrate is in the range of 10 to 20 degrees. It is.

(Configuration 12)
The dynamic friction coefficient on the surface opposite to the glass substrate of the antifouling coating layer formed on the one main surface is in the range of 0.1 to 0.3. It is the cover glass for electronic devices in any one of.
(Configuration 13)
13. The electronic device cover glass according to any one of Structures 7 to 12, wherein the antifouling coating layer is made of a fluorine-based resin material containing a perfluoropolyether compound having a hydroxyl group at a terminal group.

(Configuration 14)
The said antifouling coating layer is a cover glass for an electronic device according to any one of configurations 7 to 13, wherein the antifouling coating layer is made of a fluorine-based resin material having a weight average molecular weight of 2000 to 5000.
(Configuration 15)
The glass substrate is a cover glass for an electronic device according to any one of Structures 7 to 14, wherein the glass substrate is made of chemically strengthened aluminosilicate glass.

(Configuration 16)
A method for manufacturing a touch sensor module, comprising a glass substrate having a pair of main surfaces and end faces adjacent to the pair of main surfaces, wherein the operation of the touch sensor module is detected. One of the main surfaces is formed with a glass surface to be treated by performing a glass surface modification treatment in the order of a planar plasma treatment and a downstream plasma treatment, and the glass includes the glass treated surface. With respect to the glass substrate having an antifouling coating layer formed on the entire outer surface of the substrate, a contact angle of water on the surface of the antifouling coating layer is reduced on the other main surface of the pair of main surfaces. A step of forming an antifouling coat modified layer formed by subjecting the antifouling coat surface modification treatment, and forming at least one of an insulating layer and a transparent conductive layer on the outer surface of the antifouling coat modifying layer; It is a manufacturing method of the touch sensor module which comprises the step of.

ADVANTAGE OF THE INVENTION According to this invention, the cover glass for electronic devices which can improve durability remarkably compared with the antifouling coating surface by the conventional dip method, and its manufacturing method can be provided.
Moreover, according to this invention, the cover glass for electronic devices which can improve productivity compared with the antifouling coating process by a vapor deposition method, and its manufacturing method can be provided.
Furthermore, according to this invention, the manufacturing method of a touch sensor module provided with the glass substrate which improved durability of the antifouling coating surface and improved adhesion stability, such as a transparent conductive layer, can be provided.

It is a schematic sectional drawing which shows one Embodiment of the cover glass for electronic devices which concerns on this invention. It is a flowchart of the manufacturing method of the cover glass for electronic devices which concerns on this invention. It is a schematic sectional drawing which shows the manufacturing method of the cover glass for electronic devices which concerns on this invention in process order. It is a top view which shows an example of the shape of the glass substrate for cover glasses.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. Here, a cover glass for portable equipment, which is an embodiment of a cover glass for electronic equipment, will be mainly described.
FIG. 1 is a schematic cross-sectional view showing an embodiment of a cover glass for portable equipment which is an embodiment of the cover glass for electronic equipment according to the present invention.
According to one embodiment of the present invention shown in FIG. 1, a cover glass 10 for a portable device according to the present invention includes a flat glass substrate 1. The glass substrate 1 has a pair of front and back main surfaces 1A and 1B and an end face 1C adjacent to the pair of main surfaces. On one main surface 1A of the pair of main surfaces, a glass surface to be processed is formed by performing glass surface modification treatment. And the antifouling coating layer 3 is formed in the said glass to-be-processed surface and the said end surface 1C.

  One of the characteristic configurations in the present invention is that a glass processing surface is formed on the one main surface 1A, and the glass processing surface is subjected to planar plasma processing and downstream plasma processing in this order. It is formed by performing the glass surface modification process to be performed.

In the cover glass 10 for a portable device according to the present invention, the antifouling coating layer 3 is formed on the one main surface 1A on which the glass surface modification treatment is performed and the glass treated surface is formed. Yes. With this configuration, for example, the adhesion stability of the antifouling coating material to the glass substrate is improved as compared with a conventional antifouling coating layer formed by the dip method without performing surface treatment or the like on the glass substrate, for example. Durability is significantly improved. As will be described later, a fluorine-based resin material is preferably used as the antifouling coating material. However, when this fluororesin material is applied to a glass substrate by a dip method, the adhesion stability to the glass substrate is particularly bad. For this reason, even when such a fluororesin material is used as an antifouling coating material and applied to a glass substrate by the dip method, the adhesion stability to the glass substrate is improved and the durability of the antifouling coating surface is remarkably improved. The present invention which can be made is particularly suitable.
The details of the glass surface modification treatment in which the planar plasma treatment and the downstream plasma treatment are performed in this order will be described later.

  Here, the material of the antifouling coating layer 3 will be described. When a user uses a touch panel operation type portable device, the display screen is directly touched with a finger to operate, and thus a fingerprint or the like is likely to adhere to the display screen. Therefore, it is desirable to prevent or suppress the fingerprints and the like from adhering to the display screen, or to easily wipe off even if the fingerprints and the like are attached. For that purpose, as a material of the antifouling coating layer 3, even if it is directly touched (pressed) with a finger, it prevents or suppresses dirt such as fingerprints from being attached or easily wipes off even if dirt such as fingerprints adheres. It is preferable to select a material having antifouling properties. It is also important to have excellent transparency. In the present invention, the surface energy of a fluorine resin material (for example, a perfluoropolyether compound having a hydroxyl group at a terminal group) is used as a material having good antifouling properties and excellent transparency. A material for lowering is preferred.

  Further, the other main surface 1B of the pair of main surfaces in the glass substrate 1 is subjected to an antifouling coat surface modification process which is a process for reducing the contact angle of the surface with water on the antifouling coat layer 3. The antifouling coat modified layer 3a is formed by applying.

  An antifouling coating layer 3 is formed on one main surface 1A and the end surface 1C on which the glass treated surface is formed. For example, the entire glass substrate is immersed in the antifouling coating material by dipping. In the case of forming the dirty coating layer 3, the anti-staining coating layer is also formed on the other main surface 1B. In the case of the cover glass 10 for a portable device in FIG. 1, the main surface 1A side of the glass substrate 1 whose durability of the antifouling coating surface is improved is usually outside the portable device, and the other main surface 1B of the glass substrate 1 is used. It is assembled with the side facing the inside of the mobile device.

  Here, a transparent conductive layer is formed on the main surface 1B side of the glass substrate 1 (via an insulating layer if necessary), and a signal corresponding to the user's operation is provided by the glass substrate 1 and the transparent conductive layer. Can be made as a touch sensor module. In this case, when the antifouling coating layer 3 made of, for example, a fluorine resin material is formed on the main surface 1B side of the glass substrate 1, the insulating layer or the transparent conductive layer is formed on the outer surface of the antifouling coating layer 3. The adhesion stability of is poor. For this reason, it is difficult to form the insulating layer and the transparent conductive layer on the outer surface of the antifouling coating layer 3, and a touch sensor module cannot be formed.

  In the present invention, the other main surface 1B of the glass substrate 1 is subjected to the antifouling coat surface modification treatment, which is a treatment for reducing the contact angle of the surface with water, on the antifouling coating layer 3. By forming the antifouling coat modifying layer 3a, the adhesion stability of the insulating layer and the transparent conductive layer formed on the outer surface thereof can be improved. Examples of the antifouling coating surface modification treatment include methods such as a helium (He) plasma exposure treatment or an ultraviolet irradiation treatment by a planar method.

  In the cover glass 10 for a portable device according to the present invention, water contact on the surface of the antifouling coating layer 3 formed on one main surface 1A of the glass substrate 1 (the surface opposite to the glass substrate 1). The angle is in the range of 110 degrees to 120 degrees, and the contact angle of the oil, for example hexadecane, is preferably in the range of 60 degrees to 70 degrees. When the contact angle with water or oil is within the above range, even if it is directly touched (pressed) with a finger, it prevents or suppresses fingerprints and other dirt from being deposited, or fingerprints and other dirt are adhered. Demonstrates good antifouling property that facilitates wiping. The contact angle is an initial contact angle after the antifouling coating layer is formed. In the present invention, as described above, the durability of the antifouling coating layer 3 formed on the main surface 1A of the glass substrate 1 is improved. For example, even if a durability test by sliding steel wool described in the examples described later is performed, the contact angle is hardly lowered and good antifouling property can be maintained.

Moreover, in the cover glass 10 for portable devices in this invention, in the surface (surface on the opposite side to the glass substrate 1) of the said antifouling coat modification layer 3a formed in the other main surface 1B of the said glass substrate 1. The contact angle of water is 20 degrees or less, and the contact angle of oil such as hexadecane is preferably in the range of 10 degrees to 20 degrees. When the contact angle with respect to water or oil is within the above range, adhesion stability when the above-described insulating layer or transparent conductive layer is formed on the outer surface of the antifouling coating modified layer 3a can be improved.
In the present invention, the contact angle is a value measured in an atmosphere of 22 ± 2 ° C.

  Moreover, in the cover glass 10 for portable devices in this invention, the dynamic friction coefficient in the surface (surface on the opposite side to the glass substrate 1) of the said antifouling coating layer 3 formed in one main surface 1A of the said glass substrate 1 is demonstrated. Is preferably in the range of 0.1 to 0.3, or the static friction coefficient is preferably in the range of 0.2 to 0.4. Since the surface of the antifouling coating layer 3 has a dynamic friction coefficient or a static friction coefficient within the above range, the antifouling coating surface is slippery and has a good feeling when touched with a finger. In a portable device provided with glass, the operability of a touch panel, for example, by a user is good.

In the present invention, the glass constituting the glass substrate 1 is preferably amorphous aluminosilicate glass. A glass substrate made of such an aluminosilicate glass has a high strength after chemical strengthening and is suitable for a cover glass for portable devices. As such an aluminosilicate glass, for example, SiO ₂ is 58 to 75 wt%, Al ₂ O ₃ is 4 to 20 wt%, Li ₂ O is 0 to 10 wt%, and Na ₂ O is 4 to 20 wt%. An aluminosilicate glass containing as a main component can be used.

  The thickness of the glass substrate 1 is preferably in the range of, for example, about 0.3 mm to 1.5 mm, and more preferably 0.5 mm to 1.5 mm from the viewpoint of meeting the recent market needs for thinner and lighter portable devices. The range is about 0.7 mm.

Next, the manufacturing method of the cover glass for portable devices which is one Embodiment of the cover glass for electronic devices which concerns on this invention which was demonstrated above is demonstrated.
FIG. 2 is a flowchart of a method for manufacturing a cover glass for a portable device according to the present invention, and FIG. 3 is a schematic cross-sectional view showing the method for manufacturing the cover glass for a portable device according to the present invention in the order of steps.
The cover glass for portable devices according to the present invention is manufactured by a process as described below.

[Glass substrate production (step S0)]
Usually, a large glass plate is cut into a predetermined size by machining or the like to produce a glass substrate 1 for a cover glass.
For example, a large number (for example, about several tens) of sheet glass having a thickness of, for example, about 0.5 mm manufactured by the downdraw method or the float method is laminated (laminated), and a predetermined size is obtained using a glass cutter. Cut into small pieces. As described above, if the laminated state is cut at a time, the laminated pieces can be shaped at the same time in the next shape processing step, which is advantageous in production. The size of the small piece is determined in consideration of the size of the cover glass of the product plus the margin necessary for processing the outer peripheral shape.
Here, regarding the outer shape processing, instead of the cutting processing in the laminated state, the sheet-like glass material may be processed one by one. In addition, an etching method may be applied to the outer shape processing as a means other than machining.

  The glass composition of the glass substrate 1 is as described above. In addition, as described above, the thickness of the glass substrate 1 is preferably in the range of, for example, about 0.3 mm to 1.5 mm, more preferably from the viewpoint of meeting the recent market needs for thinning and lightening portable devices. Is in the range of about 0.5 mm to 0.7 mm.

Next, necessary drilling processing, outer peripheral shape processing, and the like are performed on the glass substrate 1 processed into small pieces of a predetermined size by machining or etching.
FIG. 4 is a plan view showing an example of the shape of the glass substrate. In the example shown in FIG. 4, the glass substrate 1 has an outer peripheral end face 1a, a notch 1b, an ear hole 1c, and a key operation hole 1d. Such drilling and outer peripheral shape processing may be machined by sandblasting or the like, or these drilling processing and outer peripheral shape processing may be collectively performed by etching. In particular, etching is advantageous for complex shape processing. Moreover, you may use together machining and an etching process according to a process shape. Furthermore, the sheet-like glass material may be made into small pieces by appropriately setting the dissolution pattern during the etching process, and in the same process as this small piece, the small pieces may have the shape of the glass substrate 1 shown in FIG. .

Next, a chemical strengthening process is performed on the glass substrate 1 that has undergone the shape processing.
As a method of chemical strengthening treatment, for example, a low temperature ion exchange method in which ion exchange is performed in a temperature range that does not exceed the temperature of the glass transition point, for example, a temperature of 300 ° C. to 500 ° C. is preferable. The chemical strengthening treatment is a process in which a molten chemical strengthening salt is brought into contact with a glass substrate, whereby an alkali metal element having a relatively large atomic radius in the chemical strengthening salt and a relatively small atomic radius in the glass substrate. This is a treatment in which an alkali metal element is ion-exchanged, an alkali metal element having a large ion radius is permeated into the surface layer of the glass substrate, and compressive stress is generated on the surface of the glass substrate. As the chemical strengthening salt, alkali metal nitric acid such as potassium nitrate or sodium nitrate can be preferably used. A chemically strengthened glass substrate is improved in strength and excellent in impact resistance, and thus is suitable for a cover glass used for a portable device that requires impact and pressure and requires high strength.

  Next, printing is performed on the surface of the glass substrate subjected to the above chemical strengthening treatment (printing step). For example, as an example of a cover glass for a mobile phone, there are at least two layers such as a company name or a product name logo, an icon such as a touch panel, various sensor windows, a border around the screen, and a pressing pattern on the back surface. For example, a multi-color multilayer structure such as an eight-layer structure is required. One example of the cover glass printing method is screen printing.

  In addition, in order to improve the printing quality in the printing process, specifically, in order to suppress the deterioration (discoloration) in the printing portion of the glass substrate due to contact with air or the like, an antifouling coat is previously provided as a printing region protective layer. You may give it. Further, in this printing process, the operation of loading the glass substrate into the jig of the printing machine and removing it from the jig is repeated according to the number of times of printing. An antifouling coat may be applied in advance as a contact protective layer for preventing the glass substrate 1 from being damaged due to repeated contact. However, to prevent printing, the antifouling coating layer on the printing surface side is removed during the printing process, or a modification treatment is performed to reduce the contact angle of water on the surface of the antifouling coating layer. Is desirable.

[Glass surface modification treatment (step S1)]
Next, a glass surface modification treatment is performed on the glass substrate 1 (see FIG. 3A) produced as described above. Usually, since the printing surface formed on the surface of the glass substrate 1 is mounted toward the inside of the portable device, the surface opposite to the printing surface, that is, the glass substrate surface exposed toward the outside of the portable device. Glass surface modification treatment. In FIG. 2 and FIG. 3, although the description of the printing layer is omitted, for example, the printing layer is formed on the other main surface 1B side of the glass substrate 1, and the glass surface to be treated is provided on the one main surface 1A. 2 is formed (see FIG. 3B). The glass surface 2 is formed by performing a glass surface modification process in which a planar plasma process and a downstream plasma process are performed in this order.

The planar plasma processing is a mode in which two discharge electrodes are provided at a certain interval, a substrate to be processed is mounted within the interval, and plasma is generated to perform the processing. In this case, for example, He, Ar, N ₂ or the like is used as a gas used for plasma generation. A voltage necessary for plasma generation is applied between the two electrodes, and ions ionized in the plasma space are accelerated in this space and collide with the surface of the substrate to be processed. Thereby, the glass substrate surface is modified so that the skewness (Rsk: skewness) of the contour curve on the glass substrate surface approaches 0, and the unevenness of the uneven shape on the glass substrate surface is reduced. Here, Rsk is preferably in the range of 0 ± 0.3, more preferably in the range of 0 ± 0.15.

In addition, the downstream type plasma processing means that a voltage required for plasma generation is applied between two electrodes arranged opposite to each other so as to sandwich a gas supply path to a substrate to be processed, and the plasmaized gas is processed. In this mode, the substrate is irradiated and supplied for processing. By irradiating the surface of the substrate to be processed with an excitation gas, a functional group such as a hydroxyl group or a carboxyl group is formed on the substrate surface, and the substrate surface is modified. It can also be used to remove organic contaminants on the substrate surface. As a gas used in this case, for example, a mixed gas of N ₂ and O ₂ or air is used.

  In the present invention, it is important to form the glass treated surface 2 by performing the planar plasma treatment and the downstream plasma treatment in this order as the glass surface modification treatment. By performing such a glass surface modification treatment, for example, the adhesion stability of the antifouling coating material to the glass substrate is higher than that of a conventional antifouling coating layer formed by the dip method without particularly performing a surface treatment or the like on the glass substrate. The durability of the antifouling coating surface can be remarkably improved. As the antifouling coating material applied to the glass surface, a fluorine resin material is preferably used. However, when this fluororesin material is applied to a glass substrate by a dip method, the adhesion stability to the glass substrate is particularly bad. For this reason, even when such a fluororesin material is used as an antifouling coating material and applied to a glass substrate by the dip method, the adhesion stability to the glass substrate is improved and the durability of the antifouling coating surface is remarkably improved. Can be made.

In the present invention, in the case of the planar plasma treatment, the reaction gas used is preferably He, Ar or N ₂ , and more preferably He. Moreover, although it changes somewhat according to the kind of reaction gas to be used, as for the electric power used, the range of 200-500W is preferable and 300-400W is more preferable. The treatment time is preferably 10 to 250 seconds, more preferably 30 to 90 seconds. On the other hand, in the case of the downstream plasma treatment, the reaction gas used is preferably a mixed gas of an inert gas and air or O _2, and more preferably a mixed gas of N ₂ and air. Moreover, although it changes somewhat depending on the kind of reaction gas to be used, the power used is preferably in the range of 400 to 1200 W, more preferably in the range of 600 to 1000 W. Moreover, as processing time, it is suitable to process in the range of 5 to 60 seconds, and it is more suitable to process in the range of 10 to 15 seconds.

  In the present invention, as the glass surface modification treatment, both the planar plasma treatment and the downstream plasma treatment are performed. As the order of these two treatments, the planar plasma treatment is first performed as described above. Followed by the downstream plasma treatment. Thereby, the glass surface shape is changed, and further, a functional group is generated on the glass surface, and the effects of the present invention are exhibited, which is preferable.

[Anti-fouling coating layer formation (step S2)]
Next, as described above, the glass surface modification treatment is performed on one main surface 1A, and the antifouling coating layer 3 is formed on the glass substrate 1 on which the glass treated surface is formed (FIG. 3C). reference).
In the present invention, the antifouling coating layer 3 is preferably formed by coating, for example, by a dip method. The dip method is performed by immersing the entire glass substrate 1 in a coating solution containing, for example, the fluororesin as a main component in an appropriate solvent as an antifouling coating material, and taking it out and drying it. According to this dip method, the antifouling coating layer 3 having a uniform film thickness can be formed on the entire surface of the glass substrate 1 without using a vacuum film forming apparatus.

  The coating thickness of the antifouling coating layer 3 is not particularly limited, but is preferably in the range of 0.3 nm to 30 nm, for example. When the film thickness is less than 0.3 nm, the durability is insufficient and the antifouling function may not be sufficiently exhibited. On the other hand, when the film thickness exceeds 30 nm, the transparency is lowered, so that it does not comply with the demand for portable devices.

  As described above, the main surface 1A of the glass substrate 1 exposed on the front side of the portable device when incorporated in the display panel of the portable device is formed with a surface to be treated by the glass surface modification treatment of the present invention. Since the adhesion stability of the antifouling coating layer 3 formed by the dip method is improved, the durability can be remarkably improved as compared with the antifouling coating surface by the conventional dip method.

  In addition to this, when an external force is applied to the cover glass, the antifouling coating layer alleviates the impact on the glass substrate surface, causing cracks in the glass substrate that cause a reduction in the strength of the brittle material glass. Since it becomes difficult, the mechanical strength of the cover glass can be improved. That is, the mechanical strength as the cover glass can be further improved by forming the antifouling coating layer on the chemically strengthened glass substrate.

  By the way, the antifouling coating layer has an adhesion region that adheres to the surface of the glass substrate and a flow region that is disposed on the surface of the adhesion region. The adhesion region is a region where molecules of the coating material are firmly bonded to a functional group such as a hydroxyl group or a carboxyl group on the surface of the glass substrate. The flow region is a region where the molecular chains of the coating materials are intertwined to maintain the state. The adhesion region and the flow region have the same composition, and there is no difference in appearance by a micrograph or the like. However, the flow region is easily dissolved in the solvent, and the adhesion region is not easily dissolved in the solvent. Therefore, the adhesion region is a region that remains when immersed in a solvent (for example, immersed in HFE for 1 minute), and the flow region can be identified as a region that dissolves when immersed in a solvent. The film thickness of the adhesion region and the flow region can be measured by, for example, an ellipsometer MARY-102 manufactured by FiveLab.

Here, the ratio of the thickness of the adhesion region to the thickness of the antifouling coating layer is preferably 40% to 70%. This is because if the thickness ratio of the adhesion region is less than 40%, the durability cannot be exhibited. Further, if the ratio of the thickness of the adhesion region is more than 70%, the slipperiness cannot be exhibited. Furthermore, if it is 40%-70%, durability and slipperiness can be exhibited better. Moreover, in order to better exhibit durability and slipperiness by setting the thickness ratio of the adhesion region to 40% to 70%, it is more preferable to use a fluorine-based resin material having a weight average molecular weight of 2000 to 5000 as a coating material. .
In order to adjust the thickness of the adhesion region, specifically, a baking process, an ultraviolet irradiation process, a vacuum degree adjusting process using a reduced pressure, or the like can be performed.

  In the baking treatment, the antifouling coating layer can be dried by heating at a temperature equal to or higher than the evaporation temperature of the solvent in a constant temperature oven. The heating temperature is preferably 120 ° C to 180 ° C. The heating time is preferably 30 minutes to 1 hour. Here, the higher the heating temperature and the longer the heating time, the more the thickness of the flow region can be reduced. At the same time, the bonding between the molecules of the coating material constituting the adhesion region and the surface of the glass substrate is promoted by heat, and the adhesion region can be enlarged.

In the ultraviolet irradiation treatment, ultraviolet rays having a wavelength of 150 to 400 nanometers are preferable. Further, as the ultraviolet light source, for example, a low-pressure mercury lamp, a high-pressure mercury lamp, or an ultrahigh-pressure mercury lamp can be used. The illuminance of the ultraviolet light source can be about 300 [cmW / cm ² ]. The higher the illuminance of the ultraviolet light and the longer the irradiation time, the more the thickness of the flow region can be reduced. Further, in the ultraviolet irradiation treatment, the atmospheric temperature may be adjusted and the heat treatment may be performed simultaneously. Thereby, an adhesion area | region can be expanded.

  In the vacuum degree adjustment process, the solvent can be evaporated by adjusting the degree of vacuum so that the pressure is lower than the vapor pressure of the solvent. The higher the degree of vacuum (lowering the atmospheric pressure) and the longer the processing time, the more the thickness of the flow region can be reduced. Further, in the vacuum degree adjustment process, the atmospheric temperature may be adjusted and the heat treatment may be performed simultaneously. Thereby, an adhesion area | region can be expanded.

[Anti-fouling coating surface modification treatment (step S3)]
Next, the antifouling coat layer 3 formed on the other main surface 1B of the glass substrate 1 is subjected to an antifouling coat surface modification process which is a process for reducing the contact angle of water on the surface, thereby improving the antifouling coat. A quality layer 3a is formed (see FIG. 3D).

  An antifouling coating layer 3 is formed on one main surface 1A and the end surface 1C on which the glass treated surface is formed. For example, the entire glass substrate is immersed in the antifouling coating material by dipping. In the case of forming the dirty coating layer 3, the anti-staining coating layer is also formed on the other main surface 1B. Here, for example, at least one of an insulating layer and a transparent conductive layer is formed on the main surface 1B side of the glass substrate 1 incorporated toward the inside of the mobile device, and the operation of the user of the mobile device is detected. A touch sensor module may be used. In such a case, in the present invention, the antifouling coating surface modification treatment is a treatment for reducing the contact angle of water on the surface of the antifouling coating layer 3 formed on the other main surface 1B of the glass substrate 1. By forming the antifouling coat modified layer 3a by applying the above, it is possible to improve the adhesion stability of the insulating layer and the transparent conductive layer formed on the outer surface thereof. Further, the formation of the antifouling coating modified layer 3a improves the adhesion stability of these layers as compared with the case where an insulating layer or a transparent conductive layer is directly formed on the main surface 1B of the glass substrate 1. The effect of doing is also acquired.

  As such antifouling coating surface modification treatment, for example, a method such as helium (He) plasma exposure treatment or ultraviolet irradiation treatment by a planar method is preferably exemplified. Regarding conditions such as irradiation energy and irradiation amount (irradiation time) when performing ultraviolet irradiation, and conditions such as plasma energy and processing time when performing plasma exposure treatment, preferable conditions can be selected as appropriate. It is possible to adjust the thickness in the depth direction of the antifouling coat modified layer 3a formed on the antifouling coat layer 3 by these ultraviolet irradiation conditions or plasma exposure treatment conditions.

  The transparent conductive layer is formed with a predetermined thickness along the outer surface of the antifouling coat modifying layer 3a formed on the main surface 1B of the glass substrate 1. The “predetermined thickness” of the transparent conductive layer is, for example, 100 nm or less when formed by a sputtering method, and includes a transparent resin serving as a binder when formed by a printing method. 1000 nm or less.

Specifically, a transparent conductive layer, for example, an ITO (Indium Tin Oxide) film is formed on the outer surface of the antifouling coating modified layer 3a using a sputtering method or the like, and is applied to a photolithography technique or YAG (Yttrium Aluminum Garnet). These are formed by processing the transparent conductive layer into a desired pattern shape using a laser patterning technique using a fundamental wave or a CO ₂ laser. In addition, the connection part (metal wiring) is formed by forming a metal conductive material on the surface of the printing region of the glass substrate by using a sputtering method or the like, and using a photolithography technique or the like to form the metal film. Is formed into a desired pattern shape.

Further, an insulating layer may be provided between the surface of the antifouling coat modified layer 3a and the transparent conductive layer, and between the surface of the antifouling coat modified layer 3a and the connection portion (metal wiring), as necessary. Is formed. This insulating layer is preferably formed using an insulating material having transparency, for example, an inorganic material such as SiO ₂ . The insulating layer is preferably formed to a thickness of about 50 to 1000 mm using, for example, a sputtering method.
As described above, the cover glass 10 for a mobile device according to the present embodiment is manufactured and incorporated into the mobile device.

  The present invention also provides a method for manufacturing a touch sensor module. That is, a touch sensor module manufacturing method for detecting a user's operation, comprising a glass substrate having a pair of main surfaces and end faces adjacent to the pair of main surfaces, One main surface of the main surfaces is formed with a glass-treated surface by performing a glass surface modification treatment, and the glass-treated surface has an antifouling coating layer formed on the glass substrate. An antifouling coat reforming layer is formed on the other main surface of the pair of main surfaces by subjecting the antifouling coating layer to an antifouling coating surface modification treatment that reduces the contact angle of water on the surface. And a step of forming at least one of an insulating layer and a transparent conductive layer on the outer surface of the antifouling coating modified layer.

According to the method for manufacturing a touch sensor module of the present invention, a touch sensor module including a glass substrate with improved durability of an antifouling coating surface and improved adhesion stability of a transparent conductive layer or the like can be obtained.
In the above embodiment, the case where the antifouling coating treatment is performed by the dipping method has been described. However, in the present invention, the antifouling coating treatment method is not limited to the dipping method, and for example, a spin coating method or a spray method. It can also be applied to vapor deposition, brush coating, and the like.

The present invention will be described more specifically with reference to the following examples. Here, the Example of the cover glass for portable devices which is one Embodiment of the cover glass for electronic devices which concerns on this invention is demonstrated. In addition, this invention is not limited to a following example.
Example 1
The portable device of the present embodiment is subjected to the following (1) glass substrate manufacturing step, (2) glass surface modification treatment step, (3) antifouling coating layer forming step, and (4) antifouling coating surface modification treatment step. A cover glass was manufactured.

(1) Glass substrate production process First, a glass substrate for a cover glass was produced by cutting out a predetermined size from a 0.5 mm thick plate glass made of an aluminosilicate glass produced by a downdraw method or a float method. As the aluminosilicate _glass, SiO 2: 58 to 75 _{wt%, Al} 2 O 3: _{4~20 wt%,} Li 2 O: _{3~10 wt%,} Na 2 O: _4~13 chemical containing wt% Tempered glass was used.
Next, a hole was made in the glass substrate using a grindstone (for small opening diameter processing) or the like, and shape processing of the outer peripheral end face as shown in FIG. 4 was performed, for example.

  Next, chemical strengthening was performed on the glass substrate after the shape processing. For chemical strengthening, a chemical strengthening solution in which potassium nitrate and sodium nitrate are mixed is prepared, this chemical strengthening solution is heated to 380 ° C., and the cleaned and dried glass substrate after the above shape processing is immersed for about 4 hours. Was done. The glass substrate after chemical strengthening was sequentially immersed in each of washing tanks of sulfuric acid, neutral detergent, pure water, pure water, IPA, and IPA (steam drying), ultrasonically cleaned, and dried.

The printing process was implemented on the other main surface with respect to the glass substrate which performed the said chemical strengthening process. That is, a predetermined printing layer (ink layer) was formed by screen printing.
Thus, a glass substrate was produced.

(2) Glass surface modification treatment step A glass surface modification treatment was performed on the main surface opposite to the printed surface of the glass substrate produced above.
Specifically, first, plasma treatment by a planar method was performed under the following conditions.
・ Reaction gas: He
・ Power consumption: 300W
Processing time: 180 seconds Subsequently, plasma processing was performed by the downstream method under the following conditions.
Reaction gas: N ₂ (flow rate 80 liters / minute) + air (flow rate 80 liters / minute)
・ Power consumption: 800W
・ Processing time: 13 seconds

(3) Antifouling coating layer forming step The above-mentioned coating solution (liquid temperature: 25 ° C.) prepared by adjusting the fluororesin (manufactured by Shin-Etsu Chemical Co., Ltd. (trade name) KY100 series) to an appropriate concentration with a solvent by the dipping method The antifouling coating layer made of the fluororesin was applied to the entire surface of the glass substrate after the glass surface modification treatment, and dried with hot air at 100 ° C. The coating thickness of the antifouling coating layer was 10 nm. The film thickness of the antifouling coating layer is a value measured by an ellipsometer MARY-102 manufactured by FiveLab.
The contact angle (initial contact angle) with respect to water on the surface of the antifouling coating layer formed on the main surface of the glass substrate subjected to the glass surface modification treatment was 115 degrees. The contact angle was measured according to JIS R3257 using a contact angle meter DM-501 manufactured by Kyowa Interface Science.

(4) Antifouling coating surface modification treatment step The antifouling coating layer formed on the printed surface side of the glass substrate was subjected to plasma treatment by a planar method under the following conditions.
・ Reaction gas: He
・ Applied voltage: 300W
Treatment time: 5 seconds Although the contact angle with water on the surface of the antifouling coating layer before the plasma treatment was 115 degrees, the contact angle immediately after the plasma treatment was lowered to 20 degrees or less.

Thus, the cover glass of this example was completed.
About the obtained cover glass, when the static friction coefficient and dynamic friction coefficient of the antifouling coating layer surface were measured, the static friction coefficient was 0.35 and the dynamic friction coefficient was 0.21. As the measurement conditions, a load having a load of 50 gf, a sliding speed of 50 mm / second, a sliding distance of 50 mm, a tip surface material of polyethylene, and a tip having a curved shape was used.

  Furthermore, about the obtained cover glass, surface roughness Ra of the main surface, Rq, skewness Rsk, and kurtosis Rku were measured, respectively. Note that these parameters are parameters defined by JIS B0601: 2001. For example, these parameters are measured with a scanning probe microscope (Atomic Force Microscope; AFM) nanoscope manufactured by Japan Veeco, and the surface roughness Ra can be calculated by a method defined in JIS R1683: 2007. In this embodiment, a value measured at a resolution of 512 × 128 pixels in a measurement area of 1 μm × 1 μm square can be used. The measurement results are shown in Table 1. In Table 1, the planar method is described as P method, and the downstream method is described as D method.

In addition, steel wool (# 0000) is applied to the surface of the antifouling coat layer of the obtained cover glass, that is, the surface of the antifouling coat layer formed on the glass substrate main surface subjected to the glass surface modification treatment, with a load of 1 kg. The surface was slid at (surface pressure 1 kg / cm ² ), and the change in contact angle with water on the surface of the antifouling coating layer was examined. The measurement results are shown in Table 2. In the cover glass of this example, the contact angle after sliding 2000 times is ensured to be 110 degrees or more, the decrease from the initial contact angle (115 degrees) is small, and the durability of the antifouling coated surface can be remarkably improved. Was confirmed.

(Example 2)
A cover glass was manufactured in the same manner as in Example 1 except that in the (2) glass surface modification treatment step of Example 1, the planar plasma treatment time was set to 60 seconds.
For the antifouling coat layer surface of the obtained cover glass, parameters such as surface roughness and contact angle were measured in the same manner as in Example 1. These results are shown in Tables 1 and 2. In the cover glass of this example, the contact angle after sliding 2000 times was ensured to be 105 degrees or more, and it was confirmed that the durability of the antifouling coating surface can be improved also in this example.

(Example 3)
A cover glass was produced in the same manner as in Example 1 except that in the (2) glass surface modification treatment step of Example 1, the planar plasma treatment time was 30 seconds.
For the antifouling coat layer surface of the obtained cover glass, parameters such as surface roughness and contact angle were measured in the same manner as in Example 1. These results are shown in Tables 1 and 2. In the cover glass of this example, the contact angle after sliding 2000 times was ensured to be 105 degrees or more, and it was confirmed that the durability of the antifouling coating surface can be improved also in this example.

(Comparative Example 1)
A cover glass was produced in the same manner as in Example 1 except that (2) the glass surface modification treatment step in Example 1 was omitted.
The contact angle was measured in the same manner as in Example 1 on the surface of the antifouling coating layer of the obtained cover glass. The results are shown in Table 2. In the cover glass of this comparative example, the contact angle after sliding 1000 times was reduced to 100 degrees or less. That is, it was confirmed that the durability of the antifouling coating surface could not be sufficiently obtained even if the antifouling coating layer was formed without performing the glass surface modification treatment of the present invention.

(Comparative Example 2)
A cover glass was produced in the same manner as in Example 1 except that the downstream plasma treatment in the (2) glass surface modification treatment step of Example 1 was omitted.
The contact angle was measured in the same manner as in Example 1 on the surface of the antifouling coating layer of the obtained cover glass. The results are shown in Table 2. In the cover glass of this comparative example, the contact angle after 1000 times of sliding decreased to 105 degrees or less, and the contact angle after 2000 times of sliding decreased to 100 degrees or less. That is, it was confirmed that the durability of the antifouling coating surface could not be sufficiently obtained even if the antifouling coating layer was formed without performing the glass surface modification treatment of the present invention.

(Comparative Example 3)
A cover glass was produced in the same manner as in Example 1 except that the planar plasma treatment in the (2) glass surface modification treatment step of Example 1 was omitted.
For the antifouling coat layer surface of the obtained cover glass, parameters such as surface roughness and contact angle were measured in the same manner as in Example 1. These results are shown in Tables 1 and 2. In the cover glass of this comparative example, the contact angle after sliding 1000 times was reduced to 100 degrees or less. That is, it was confirmed that the durability of the antifouling coating surface could not be sufficiently obtained even if the antifouling coating layer was formed without performing the glass surface modification treatment of the present invention.

As described above, in Examples 1 to 3, the glass substrate surface is modified so that Rsk of the contour curve on the glass substrate surface approaches 0 and Rku of the contour curve on the glass substrate surface decreases. It was confirmed that the unevenness of the uneven shape on the surface of the glass substrate was reduced. In addition, on the surface of the glass substrate that has undergone the downstream plasma treatment on the surface of the glass substrate that has undergone the planar plasma treatment, the adhesion stability of the antifouling coating layer applied by the dip method to the glass substrate is further enhanced. It was confirmed that the durability of the antifouling coating surface could be improved as compared with the case where the two-type plasma treatment was not performed (Comparative Examples 1 to 3).
Moreover, when it measured by the said method about the ratio of the thickness of the adhesion area | region with respect to the thickness of the antifouling coating layer in the said Examples 1-3, it was the range of 40%-70%.

Example 4
Next, an insulating layer mainly composed of SiO ₂ was formed on the antifouling coating layer modified surface of the glass substrate produced in Example 1 by a sputtering method. Next, a transparent electrode film was formed on the surface of the insulating layer. Specifically, the transparent electrode film was formed by forming an ITO (Indium Tin Oxide) film by a sputtering method and processing the transparent electrode film into a desired pattern shape using a photolithography technique. In addition, a conductive material was formed into a metal wiring by a sputtering method, and the conductive material film was processed into a desired pattern shape by a photolithography technique to manufacture a touch sensor module.
The touch sensor module of this example had good adhesion between the insulating layer and the transparent electrode film and the cover glass surface, and fulfilled a desired function as a touch sensor module.

(Comparative Example 4)
In Example 1, the antifouling coating layer on the surface opposite to the surface subjected to the glass surface modification treatment was not subjected to plasma treatment ((4) antifouling coating surface modification treatment) by the planar method, but Example 4 Attempts were made to manufacture a touch sensor module in the same manner. However, in this comparative example, the adhesion between the insulating layer and the transparent electrode film and the cover glass surface is poor, and a part of the insulating layer and the transparent electrode film cannot be deposited without adhering to the cover glass surface. Could not be manufactured.

DESCRIPTION OF SYMBOLS 1 Glass substrate for cover glasses 1A, 1B Main surface of glass substrate 1C End surface of glass substrate 2 Glass treated surface 3 Antifouling coating layer 3a Antifouling coating modification layer 10 Cover glass for portable devices

Claims (16)

A method for producing a cover glass for an electronic device comprising a glass substrate having a pair of main surfaces and an end surface adjacent to the pair of main surfaces,
A step of forming a glass surface to be treated by subjecting one main surface of the pair of main surfaces of the glass substrate to a glass surface modification treatment in order of a planar plasma treatment and a downstream plasma treatment,
A method for producing a cover glass for an electronic device, comprising: a step of forming an antifouling coating layer on the glass treated surface after the step of forming the glass treated surface.   In the step of forming the antifouling coating layer, the antifouling coating layer is formed on the entire outer surface of the glass substrate including the glass treated surface by immersing the entire glass substrate in an antifouling coating material. The manufacturing method of the cover glass for electronic devices of Claim 1.   The antifouling coat layer formed on the other main surface of the pair of main surfaces is subjected to an antifouling coat surface modification treatment that reduces the contact angle of water on the surface, and the antifouling coat modification is performed. The method for producing a cover glass for an electronic device according to claim 2, further comprising a step of forming a layer.   The method for producing a cover glass for an electronic device according to any one of claims 1 to 3, further comprising a step of performing printing on the glass substrate before the step of forming the glass surface. .   A printing region protection layer for protecting the alteration of the printing region on the surface of the glass substrate until the printing is performed is provided before the printing is performed on the surface of the glass substrate, and the printing region protection layer is provided when the printing is performed. The method for producing a cover glass for an electronic device according to claim 4, wherein the contact glass is modified or removed in order to reduce the contact angle of water on the surface of the electronic device.   6. The electronic device according to claim 4, wherein a contact protective layer for protecting the glass substrate from contact with a printing machine or a jig thereof is provided in advance on the glass substrate when the printing is performed. Manufacturing method of cover glass. A cover glass for an electronic device comprising a glass substrate having a pair of main surfaces and an end surface adjacent to the pair of main surfaces,
Rsk of one main surface of the pair of main surfaces is 0 ± 0.3,
An antifouling coating layer is formed on the one main surface,
When # 0000 steel wool is slid 2000 times with a surface pressure of 1 kg / cm ² against the surface of the antifouling coating layer, the contact angle of water on the surface of the antifouling coating layer is 105 ° or more. The cover glass for electronic devices characterized by the above-mentioned.   8. The cover glass for an electronic device according to claim 7, wherein the antifouling coating layer has an adhesion region attached to the surface of the glass substrate and a flow region disposed on the surface of the adhesion region.   The cover glass for an electronic device according to claim 8, wherein a ratio of the thickness of the adhesion region to the thickness of the antifouling coating layer is 40% to 70%. On the other main surface of the pair of main surfaces, there is an antifouling coat modified layer formed by subjecting the antifouling coat layer to an antifouling coat surface modifying treatment for reducing the contact angle of water on the surface. Formed,
The contact angle of water on the surface opposite to the glass substrate of the antifouling coating layer formed on the one main surface is in the range of 110 degrees to 120 degrees, and is formed on the other main surface. The electronic device cover according to any one of claims 7 to 9, wherein a contact angle of water on a surface of the antifouling coating modified layer opposite to the glass substrate is 20 degrees or less. Glass.   The contact angle of hexadecane on the surface opposite to the glass substrate of the antifouling coating layer formed on the one main surface is in the range of 60 degrees to 70 degrees, and is formed on the other main surface. 11. The electronic device cover according to claim 10, wherein a contact angle of hexadecane on a surface of the antifouling coating modified layer opposite to the glass substrate is in a range of 10 degrees to 20 degrees. Glass.   The dynamic friction coefficient on the surface opposite to the glass substrate of the antifouling coating layer formed on the one main surface is in the range of 0.1 to 0.3. The cover glass for electronic devices in any one of 11.   The cover glass for an electronic device according to any one of claims 7 to 12, wherein the antifouling coating layer is made of a fluororesin material containing a perfluoropolyether compound having a hydroxyl group at a terminal group.   The cover glass for an electronic device according to any one of claims 7 to 13, wherein the antifouling coating layer is made of a fluorine resin material having a weight average molecular weight of 2000 to 5000.   15. The cover glass for an electronic device according to claim 7, wherein the glass substrate is made of chemically strengthened aluminosilicate glass. A method of manufacturing a touch sensor module, comprising a glass substrate having a pair of main surfaces and an end surface adjacent to the pair of main surfaces,
On one main surface of the pair of main surfaces in the glass substrate, a glass surface to be processed is formed by performing a glass surface modification treatment for performing a planar plasma treatment and a downstream plasma treatment in that order, For the glass substrate on which the antifouling coating layer is formed on the entire outer surface of the glass substrate including the glass treated surface,
A step of forming an antifouling coat reforming layer formed on the other main surface of the pair of main surfaces by subjecting the antifouling coating layer to an antifouling coating surface modification treatment for reducing the contact angle of water on the surface. When,
And a step of forming at least one of an insulating layer and a transparent conductive layer on the outer surface of the antifouling coat modifying layer.

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