KR100629242B1 - Protective glass complex and method of manufacturing the same - Google Patents

Abstract

The protective glass composite of the present invention comprises a first glass layer made of first glass, a second glass layer disposed on the first glass layer and made of a second glass, and the first glass layer and the second glass layer bonded to each other. And a bonding resin layer interposed between the first glass layer and the second glass layer and made of a transparent cured resin. The bonding resin layer is composed of at least one of a thermosetting resin formed by thermosetting the thermosetting resin layer and a photocurable resin formed by photocuring the photocurable resin composition. The protective glass composite is thin and excellent in strength and hardness to stably protect the display screen of a portable digital device, the time display screen of various wrist watches, etc. from external shocks and the like, and the manufacturing cost is low, so the process efficiency is excellent.

Description

Protective glass complex and method of manufacturing the same

1 is a plan view showing a portable terminal employing a protective glass composite according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating the protective glass composite cut along the line II ′ of FIG. 1.

3 to 5 are cross-sectional views showing a method of manufacturing a protective glass composite according to an embodiment of the present invention.

6 is a photograph showing a broken aspect of the quartz window.

7 is a photograph showing a broken aspect of the protective glass composite according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: glass composite 112: first glass layer

114: second glass layer 116: photocurable resin composition layer

117: bonding resin layer 105: metal layer

The present invention relates to a protective window and a method for manufacturing the protective window. More specifically, it is thin in thickness, excellent in strength and shatterproof effect, and less likely to undergo deformation or surface damage due to external impact, thereby reliably protecting the display screen of a portable digital device or the time display screen of a wrist watch. It is related with the protective glass composite which can be performed, and the manufacturing method of the said protective glass composite.

Recently, the tendency to include various display screens in portable digital devices such as mobile phones, digital cameras, and MP3s has increased. These portable digital devices are often exposed to the outside, and thus there is a risk that the display screen may be damaged from external shock or be damaged by external contaminants. In order to remedy this problem, many products have been introduced that have additional windows arranged on the display screen to protect the display screen.

Plastic or quartz is mainly used as a material of the window for protecting the display screen.

However, since the display screen protection window made of the plastic material is manufactured through an injection molding process, there is a process limitation in reducing the thickness. Also, because the material itself is soft, the window can bend when an external shock is applied, damaging the display screen. In order to reduce such screen damage, the display screen and the plastic window should be spaced apart by a predetermined distance or more, which hinders the slimming trend of portable digital devices.

On the other hand, the window of the plastic material is weak in hardness because it is easy to scratch the surface may cause a problem that the display quality is deteriorated.

In order to overcome the shortcomings of the plastic window, a quartz window is used. However, although the window of the quartz material can solve the disadvantages of the window of the plastic material, there is a disadvantage that the defect rate is high and the manufacturing cost is high in the production process due to poor workability of the material. In addition, because of scattering properties, quartz debris generated when the window is broken by an external impact may injure the user.

As such, display screen protection windows provided in the portable digital device of the conventional material still have problems.

The present invention has been made in consideration of the problems of the corresponding materials of the conventional window for protecting the display screen, it is thin and excellent in strength and low damage by external impact can stably protect the display screen and excellent anti-scattering effect By providing a protective glass composite that can improve the safety of the user.

The present invention also provides a method for producing the above protective glass composite.

Glass composite for display screen protection according to an aspect of the present invention comprises a first glass layer made of a first glass, a second glass layer made of a second glass and a bonding resin layer disposed on the first glass layer.

The binder resin layer is interposed between the first glass layer and the second glass layer such that the first glass layer and the second glass layer are bonded to each other and is made of a transparent cured resin. Borosilicate glass is used as the first glass and the second glass.

It is preferred that the first glass layer and the second glass layer each have a thickness of 0.1 to 2 mm.

The bonding surface of the said 1st glass layer and the said bonding resin layer, and the bonding surface of the said 2nd glass layer and the said bonding resin layer are respectively maintained in the bubble free state.

The bonding resin layer is made of at least one of a thermosetting resin formed by thermosetting the thermosetting resin and a photocuring resin formed by photocuring the photocurable resin.

The photocurable composition is i) 30 to 60% by weight isocyanurate resin, ii) 10 to 30% by weight mercapto resin, iii) 10 to 30% by weight methacrylate monomer, iv) 4 to 4 photopolymerization initiator 10 wt% and v) 1-5 wt% of the organosilane-based compound.

The protective glass composite may further include functional layers such as an anti-static layer, an anti-fog layer, an anti-fingerprint layer, an anti-reflective coating layer, an anti-scratch layer, and the functional layers may be suitable as a bonding surface or surface of the glass composite. It can be inserted in or bonded to the position.

In order to manufacture a protective glass composite according to one aspect of the present invention, a photocurable resin composition is applied on the first glass layer to form a photocurable resin composition layer. A second glass layer is bonded onto the applied photocurable resin composition layer to prepare a glass composite layer composed of the first glass layer, the photocurable resin composition layer and the second glass layer. Bubbles are removed from the bonding surface of the first glass layer and the photocurable resin composition layer and the bonding surface of the second glass layer and the photocurable resin composition layer. Further, in the process of removing bubbles, the planarization of the photocurable resin composition layer is performed in parallel. Light is irradiated to the said glass composite layer, and the said photocurable resin composition is hardened | cured and a photocurable resin is formed. As a result, the first glass layer and the second glass layer are combined to complete a protective glass composite.

The method of manufacturing the protective glass composite may further include heat treating the protective glass composite.

In addition, the manufacturing method of the protective glass composite may further include planarizing the surfaces of the first glass layer and the second glass layer when the first glass layer and the second glass layer are manufactured. The flattening step may be performed by a compression roller or the like.

In addition, the method of manufacturing the protective glass composite may further include polishing the surfaces of the first glass layer and the second glass layer.

The protective glass composite according to the present invention can implement a thin thickness and has excellent strength and hardness, thereby reducing the risk of damage and scratching of the glass composite itself due to external impact. Accordingly, it is possible to stably protect the display screen of the portable digital device, the time display screen of various wrist watches, and further prevent the display quality degradation of the devices. In addition, the scattering prevention function is excellent, the risk of injury to the user when broken by an external impact is very low.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Protective Glass Composite

1 is a plan view showing a portable terminal employing a protective glass composite according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating the protective glass composite cut along the line II ′ of FIG. 1.

1 and 2, the portable terminal 1000 includes a protective glass composite 100 disposed at a predetermined distance apart from the display screen.

The protective glass composite 100 includes a first glass layer 112, a second glass layer 114, and a binder resin layer 117 interposed between the first glass layer 112 and the second glass layer 114. It includes.

The first glass layer 112 is made of first glass, and in this embodiment, borosilicate glass is used as the first glass. The second glass layer 114 is made of a second glass, and borosilicate glass is also used as the second glass.

The first glass layer 112 and the second glass layer 114 are very high in strength, and yellowing does not occur when exposed to ultraviolet rays. Alternatively, soda-lime glass may be used as the first glass and the second glass, but in order to prevent the occurrence of yellowing, a separate protective film may be provided to prevent sodium elution or the sodium ions may be removed by surface treatment of the soda lime glass. A separate process is required.

Therefore, in order to prevent display quality deterioration by yellowing phenomenon, it is preferable to use boro silicate glass.

A bonding resin layer 117 is interposed between the first glass layer 112 and the second glass layer 114. The binder resin layer 117 is bonded to the first glass layer 112 and the second glass layer 114 to thereby bond the first glass layer 112 and the second glass layer 114. do.

The bonding resin layer 117 is made of a thermosetting resin formed by thermosetting of a thermosetting resin composition or a photocuring resin formed by photocuring of a photocurable resin composition. The binder resin layer is a transparent polymer resin having a high transmittance.

In particular, the photocurable resin may include an ultraviolet (UV) absorber and the like, which may prevent yellowing of the resin due to UV exposure and may further improve transparency of the protective glass composite.

The photocurable resin composition is i) 30 to 60% by weight of isocyanurate resin, ii) 10 to 30% by weight of mercapto resin, iii) 10 to 30% by weight of methacrylate monomer, iv) light 4 to 10 wt% of a polymerization initiator and 1 to 5 wt% of v) an organosilane compound.

When the photoinitiator is irradiated with light, it forms a radical to act as a polymerization initiator in the polymerization of the methacrylate monomer. As said photoinitiator, an acetophenone type compound, a biimidazole type compound, a triazine type compound, etc. are mentioned. The photoinitiator can also function as a UV absorber to prevent yellowing of the resin due to external ultraviolet light.

As the thermosetting resin composition, a general transparent thermosetting resin composition may be used, and the thermosetting resin composition is cured when heat is applied from the outside and converted into a thermosetting resin.

The binder resin layer 117 has excellent adhesion with the first glass layer 112 and the second glass layer 114.

In the adhesive surface formed between the bonding resin layer 117 and the first glass layer 112, the state in which the bubble is removed remains. Similarly, the inorganic bubble state in which the bubble is removed is maintained in the adhesive surface formed between the bonding resin layer 117 and the second glass layer 114. Furthermore, the binder resin layer 117 has a high flatness through a planarization process. Therefore, the bonding resin layer 117 may not only have excellent adhesion with the first glass layer 112 and the second glass layer 114, but also increase the strength of the glass composite 100. In addition, the binder resin layer 117 may prevent yellowing and have physical properties such as moisture resistance and low viscosity.

The binder resin layer 117 preferably has a refractive index similar to that of the first glass layer 112 and the second glass layer 114. More preferably, they have the same refractive index as the first glass layer 117 and the second glass layer 112. As a result, it is easy to adjust the optical properties of the light transmitted through the glass composite 100 as well as the aspect that the design is easy when adding the functional layer.

The thickness of the first glass layer 112 and the second glass layer 114 is preferably 0.1 to 2 mm, although it varies depending on the area of the entire glass composite 100.

The metal layer 105 is formed along the rim of the rear surface of the first glass layer 117, that is, the peripheral area of the surface of the first glass layer facing the display screen. Various patterns and colors, such as a company logo, may be printed on the inner surface of the metal layer 105. The metal layer 105 may be formed by a deposition process.

Although not shown, the protective glass composite 100 may further include functional layers such as an antistatic layer, an antifogging layer, a fingerprint layer, an antireflective coating layer, and a scratch prevention layer. The functional layers may be formed at appropriate positions, such as a bonding surface of the glass composite 100 or an upper surface of the second glass layer 114.

The functional layers may include a hydrophobic teflon-based compound, an inorganic oxide such as titanium oxide having super hydrophilicity, and the like.

Hereinafter, a method of manufacturing the glass composite will be described.

Method of manufacturing protective glass composite

3 to 5 are cross-sectional views showing a method of manufacturing a protective glass composite according to an embodiment of the present invention.

Referring to FIG. 3, the photocurable resin composition is applied on the first glass layer 112 to form the photocurable resin composition layer 116. The photocurable resin composition is applied on the first glass layer 112 by spin coating or the like.

Referring to FIG. 4, a second glass layer 114 is bonded onto the photocurable resin composition layer 116. When the second glass layer 114 is disposed, the first glass layer 112, the photocurable resin composition layer 116, and the second glass layer 114 may be adhered to each other using a compression roller or the like. In this compression process, bubbles between the respective joining surfaces can be removed.

Referring to FIG. 5, light is irradiated to the bonded body to which the layers 112, 114, and 116 are bonded. The light is irradiated to activate the photopolymerization initiator in the photocurable resin composition layer 116 to polymerize monomers within the composition.

As the light, ultraviolet light having an energy of 15 to 25 mW / cm 2 is preferably used. The ultraviolet light is irradiated for about 5 minutes.

After light irradiation, the photocurable resin composition layer 116 is primarily photocured. The first cured photocurable resin composition layer 116 is subjected to heat curing through heat treatment again. The heat treatment is performed for about 30 minutes at a temperature of 70 to 90 ℃.

Thereby, the said photocurable resin composition layer is hardened | cured and a solid photocurable resin layer is formed.

The manufactured glass composite may be cut into various shapes and employed in each device according to the use of a digital device or a watch.

Before the first glass and the second glass are manufactured, the flatness of the first glass and the second glass may be increased as much as possible through a roller process or the like in a separate process.

Hereinafter will be described the performance evaluation results of the protective glass composite according to an embodiment of the present invention.

Surface hardness evaluation

1. Testing machine and fixtures

-Hardness tester (manufactured by Imoto, 221D, 1kgf)

-Pencil for hardness measurement (Mits-Bisa, abrasive paper: sandpaper 400 times or more)

2. How to measure

By cutting only the wood part of the pencil, the core was exposed in a cylindrical shape about 3mm, and the grinding paper was placed on a flat surface at right angles and polished by drawing a circle so that the tip of the shim was flat and sharp. At the same location of the shim, one test was used to ensure fairness of the data.

The prepared pencil was brought into contact with the coated film surface of the prepared glass composite at an angle of about 45 degrees, and then the tester was set parallel to the coated film surface. The tester was moved about 10 mm forward at a uniform speed. It carried out 5 times, changing the position of a sample.

3. Evaluation method

The hardness of the pencil which scratched more than once in five times was shown.

4. Evaluation result

There was no scratch up to the 8H pencil.

Strength evaluation (1)

1. Testing machine and fixtures

-Falling tester (falling down to 2m height)

-5 g metal sphere

2. How to measure

The prepared glass composite is mounted on the meter jig. The area in contact with the jig was designated as 1 mm on a quadrilateral basis. The metal sphere was dropped to a specific point of the glass composite at a certain height. Each measurement was variously measured using the size and the drop height of each substrate.

3. Evaluation method

The breakage of the glass composite was observed.

4. Evaluation result

The glass composite did not break up to a height of 2 m. The measurement results are shown in Table 1 below. In Table 1 below, 'OK' indicates that no cracking phenomenon occurs.

Strength evaluation (2)

      Testing machine and fixtures

Push-pull gauge (measure 10kg)

2. How to measure

The prepared glass composite was mounted on a meter jig. The area of the glass composite in contact with the jig was set to 1 mm on a quadrilateral basis. 10 kg of pressure was applied to the push-pull gauge and then fixed for 3 minutes.

       3. Evaluation method

The breakage of the glass composite was observed.

       4. Evaluation result

No cracking was observed for 3 minutes at a load of 10 kg. Specific test results are shown in Table 2 below.

division Pressure / hour 6T 7T 8T 9.5T 1.1T 40 * 50 10kg / 3 minutes 0K 0K 0K 0K 0K 60 * 70 10Kg / 3 minutes 0K 0K 0K 0K 0K

Transmittance evaluation

1. Testing machine and fixtures

Spectrometer

2. How to measure

The prepared glass composite was mounted on a spectrometer jig and the transmittance was measured. The measurement was carried out five times depending on the thickness of the glass composite to obtain the average transmittance.

       3. Evaluation method

      The analytical data was evaluated whether the transmittance was 90% or more.

       4. Evaluation result

Regardless of the number of samples and the number of all thicknesses, the transmittance was 90% or more, and the results are shown in Table 3 below.

Fugitive  evaluation

The glass composite and quartz windows according to the present invention were broken using metal spheres, respectively, and then the cracking mode was observed.

6 is a photograph showing a broken aspect of the quartz window. 7 is a photograph showing a broken aspect of the protective glass composite according to an embodiment of the present invention.

Referring to FIG. 6, it can be seen that the window of quartz material is broken very roughly and irregularly.

Referring to Figure 7, it can be seen that the glass composite of the present invention is broken without spreading or cracking. Therefore, the protective glass composite was evaluated to have a very good scattering prevention effect.

Protective glass composite according to the present invention can implement a thin thickness and has excellent strength and hardness can reduce the risk of damage and scratches of the glass composite itself due to external impact. Therefore, it is possible to reliably protect the display screen and to prevent display quality deterioration. In addition, the scattering effect is excellent, the risk of injury to the user when broken by an external impact is very low.

In addition, the protective glass composite has a low production rate and a low manufacturing cost of production defects during manufacturing, and thus the process efficiency is very excellent.

The protective glass composite according to the present invention is expected to effectively and stably protect display screens of portable digital devices, time display screens of various wrist watches, and the like. In addition, the present invention may be effectively applied to various devices having a need for protection and a display function.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (12)

A first glass layer made of first glass; A second glass layer disposed over the first glass layer and made of a second glass; And Interposed between the first and second glass layers such that the first and second glass layers are bonded to each other; i) 30 to 60 wt% of isocyanurate resin; ii) 10 to 30% by weight of mercapto resin; iii) 10 to 30% by weight of methacrylate monomers; iv) 4 to 10 weight percent of photopolymerization initiator; And v) Glass composite for cell phone screen protection comprising a bonding resin layer made of a transparent photocurable resin containing 1 to 5% by weight of an organosilane compound.  The glass composite for protecting a mobile phone screen according to claim 1, wherein the first glass and the second glass are borosilicate glass.        The glass composite for mobile phone screen protection according to claim 1, wherein the first glass layer and the second glass layer each have a thickness of 0.1 to 2 mm.        The glass composite for mobile phone screen protection according to claim 1, wherein the bonding surface of the first glass layer and the bonding resin layer and the bonding surface of the second glass layer and the bonding resin layer are each free of bubbles.        The glass composite for protecting a mobile phone screen of claim 1, wherein the refractive index of the bonding resin layer is the same as that of the first glass layer and the second glass layer. delete delete The cell phone screen of claim 1, wherein the protective glass composite further comprises at least one layer selected from the group consisting of an antistatic layer, an antifogging layer, an anti-fingerprint layer, an anti-reflective coating layer, and an anti-scratch layer. Protective glass composite. On the first glass layer, i) 30 to 60 wt% of isocyanurate resin; ii) 10 to 30% by weight of mercapto resin; iii) 10 to 30% by weight of methacrylate monomers; iv) 4 to 10 weight percent of photopolymerization initiator; And v) applying a transparent photocurable resin composition comprising 1 to 5% by weight of an organosilane compound to form a photocurable resin composition layer; Bonding a second glass layer onto the applied photocurable resin composition layer to prepare a glass composite layer composed of the first glass layer, the photocurable resin composition layer and the second glass layer; Removing bubbles from the bonding surface of the first glass layer and the photocurable resin composition layer and the bonding surface of the second glass layer and the photocurable resin composition layer and planarizing the photocurable resin composition layer; And Method of manufacturing a glass composite for cell phone screen protection comprising the photo-curing step of curing the photocurable resin composition by irradiating the glass composite layer with light. 10. The method of claim 9, wherein the method for manufacturing the protective glass composite further comprises the step of heat treating the glass composite. 10. The method of claim 9, wherein the method of manufacturing the protective glass composite further comprises planarizing the surfaces of the first and second glass layers in the manufacturing of the first and second glass layers. Method of manufacturing a glass composite for protecting a mobile phone screen. 10. The method of claim 9, wherein the manufacturing method of the protective glass composite further comprises polishing the surfaces of the first and second glass layers.

Images