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WO2007089054A1 - Protective glass complex and method of manufacturing the same - Google Patents

Protective glass complex and method of manufacturing the same Download PDF

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Publication number
WO2007089054A1
WO2007089054A1 PCT/KR2006/000557 KR2006000557W WO2007089054A1 WO 2007089054 A1 WO2007089054 A1 WO 2007089054A1 KR 2006000557 W KR2006000557 W KR 2006000557W WO 2007089054 A1 WO2007089054 A1 WO 2007089054A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
glass
photo
complex
glass layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2006/000557
Other languages
French (fr)
Inventor
Young Jin Kim
Jin Kong
Sung Hyo Kim
Joo Hee Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OPTRON-TEC Co Ltd
Original Assignee
OPTRON-TEC Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by OPTRON-TEC Co Ltd filed Critical OPTRON-TEC Co Ltd
Publication of WO2007089054A1 publication Critical patent/WO2007089054A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B1/00—Hand tools
    • A01B1/02—Spades; Shovels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10697—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer being cross-linked
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10706—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer being photo-polymerized
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B32B17/10899—Making laminated safety glass or glazing; Apparatus therefor by introducing interlayers of synthetic resin
    • B32B17/10926—Making laminated safety glass or glazing; Apparatus therefor by introducing interlayers of synthetic resin by spraying
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/02—Dredgers; Soil-shifting machines hand-operated ; handheld soil shifting equipment acting by sucking E02F3/8891
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133331—Cover glasses

Definitions

  • the present invention relates to a protective window and a method of manufacturing the protective window, and more particularly, to a protective glass complex and a method of manufacturing the protective glass complex, which is thin and has excellent durability and non-scattering property as well as not becoming deformed and showing no surface damage from an external impact, thereby stably protecting a display screen of a portable digital device or a time display screen of a watch.
  • various portable digital devices such as a mobile phone, a digital camera, and an MP3 include a display screen. Since portable digital devices are frequently exposed to external elements, a display screen thereof may break or become contaminated by external materials. To solve these problems, an additional window capable of protecting the display screen is disposed above the display screen.
  • the binder resin layer may be disposed between the first glass layer and the second glass layer to bind the first glass layer with the second glass layer and formed of a transparent and curable resin.
  • the first glass and the second glass may be formed of borosilicate glass.
  • the photo-curable resin composition may include: i) isocyanurate resin having a proportion of about 30 to about 60 % by weight; ii) mercapto resin having a proportion of about 10 to about 30 % by weight; iii) methacrylate monomer having a proportion of about 10 to about 30 % by weight; iv) photoinitiator having a proportion of about 4 to about 10 % by weight; and v) organosilane compound having a proportion of about 1 to about 5 % by weight.
  • the protective glass complex may further include functional layers such as an anti-static layer, an anti-fogging layer, an anti-fingerprint layer, an antireflective coating layer, and an anti-scratch layer. The functional layers may be disposed in a suitable position such as the contact surface or a surface of the protective glass complex.
  • a method of manufacturing a protective glass complex including: forming a photo-curable resin composition layer by applying a photo-curable resin composition on a first glass layer; preparing a glass complex layer formed of the first glass layer, the photo-curable resin composition layer, and a second glass layer adhering the second glass layer on the applied photo-curable resin composition layer; removing bubbles from a contact surface between the first glass layer and the photo-curable resin composition layer, and a contact surface between the second glass layer and the photo- curable resin composition layer, and planarizing the photo-curable resin composition; and photo-curing the photo-curable resin composition by irradiating light to the glass complex layer.
  • the method may further include a heat treatment of the glass complex.
  • thermosetting resin composition when a thermosetting resin composition is used instead of the photo-curable resin composition as the resin composition layer, the irradiating of the light may be omitted.
  • FIG. 2 is a cross-sectional view illustrating the protective glass complex cut along an I-F line shown in FIG. 1 ;
  • FIGS. 3 through 5 are cross-sectional views illustrating a method of manufacturing a protective glass complex, according to an embodiment of the present invention
  • a binder resin layer 117 is disposed between the first glass layer 112 and the second glass layer 114.
  • the binder resin layer 117 is mutually adhered to the first glass layer 112 and the second glass layer 114 to bind the first glass layer 112 with the second glass layer 114.
  • the binder resin layer 117 is formed of one of a resin formed by thermally curing a thermosetting resin composition and a resin formed by photo-curing a photo- curable resin composition.
  • the binder resin layer is a transparent polymer resin having a high transparency rate.
  • the photo-curable resin composition includes an ultraviolet (UV) absorbent, the yellowing of the resin due to exposure to UV light may be prevented and transparency of the protective glass complex may be improved.
  • the photo-curable resin composition includes: i) isocyanurate resin of about 30 to about 60 % by weight; ii) mercapto resin of about 10 to about 30 % by weight; iii) methacrylate monomer of about 10 to about 30 % by weight; iv) photoinitiator of about 4 to about 10 % by weight; and v) organosilane compound of about 1 to about 5 % by weight.
  • thermosetting resin composition may be formed of general transparent and curable resin composition. When applying heat from outside, the thermosetting resin composition is cured to be converted into a thermosetting resin.
  • thermosetting resin composition and the photo-curable resin composition may further include a cross-linking agent to perform a cross-linking reaction by irradiating light or applying heat.
  • Bubble-free states in which bubbles are removed are formed on an interface formed between the binder resin layer 117 and the first glass layer 112. Similarly, the bubble-free states in which the bubbles are removed are also formed on an interface formed between the binder resin layer 117 and the second glass layer 114.
  • the binder resin layer 117 is planarized and has excellent planarization property. Accordingly, the binder resin layer 117 may closely attached to the first glass layer 112 and the second glass layer 114 and also may improve strength of the protective glass complex 100. Also, the binder resin layer 117 may prevent yellowing and may have properties such as being moisture-proof and having low viscosity.
  • the binder resin layer 117 may have an index of refraction, similar to the first glass layer 112 and the second glass layer 114. More preferably, the binder resin layer 117 may have an index of refraction identical with the first glass layer 112 and the second glass layer 114. Therefore, designing may be easy when adding various functional layers as well as controlling optical property of light transmitted via the protective glass complex 100.
  • a thickness of the first glass layer 112 and the second glass layer 114 may be about 0.1 to about 2 mm, which varies with a whole area of the protective glass complex 100.
  • a metal layer 105 may be formed around a rear surface of the first glass layer 117, opposite to a display screen. Various patterns such as a logo and colors may be printed in an inner surface of the metal layer 105.
  • the metal layer 105 may be formed by deposition.
  • the protective glass complex 100 may further include functional layers such as an anti-static layer, an anti-fogging layer, an anti-fingerprint layer, an antireflective coating layer, and an anti-scratch layer.
  • the functional layers may be disposed in a suitable position such as the contact surface of the protective glass complex 100 or a top surface of the second glass layer 114.
  • the function layers may include an inorganic oxide such as a Teflon compound having hydrophobicity and titanium compound having super hydrophilicity.
  • an inorganic oxide such as a Teflon compound having hydrophobicity and titanium compound having super hydrophilicity.
  • FIGS. 3 through 5 are cross-sectional views illustrating a method of manufacturing a protective glass complex, according to an embodiment of the present invention.
  • a photo-curable resin composition is applied to a first glass layer 112 to form a photo-curable resin composition layer 116.
  • the photo-curable resin composition is applied by spin coating or spray coating a top surface of the first glass layer 112.
  • the second glass layer 114 is connected with a top surface of the photo-curable resin composition layer 116.
  • the first glass layer 112, the photo-curable resin composition layer 116, and the second glass layer 114 may be closely attached to others by a roller. In this case, bubbles formed between interfaces may be removed. To remove the bubbles, various additional bubble removing processes may be performed.
  • light is irradiated to a binder resin layer formed of the layers 112, 114, and 116.
  • the light activates the photoinitiator included in the photo- curable resin composition layer 116 to polymerize monomers in the composition.
  • a UV ray having energy of about 15 to about 25 mW/cm 2 may be used as the light.
  • the UV ray is irradiated for about 5 minutes.
  • the photo-curable resin composition layer 116 is photo-cured to form a solid photo-cured resin layer.
  • the manufactured protective glass complex may be cut into various shapes depending on use such as a digital device or a watch and may be employed to each device.
  • the first glass and second glass may be planarized to a maximum by an additional rolling process in injection molding.
  • a wooden part of the pencil is whittled to sharpen a lead of the pencil to expose approximately 3 mm in a cylindrical shape.
  • the lead is disposed perpendicular to the abrasive paper disposed on a flat surface and is ground while drawing a circle such that an end of the lead is flat and has an acute angle. An identical position of the lead is tested once to maintain impartiality of data.
  • Hardness was measured by checking for the pencil generating at least one scratch from the five measurements.
  • the manufactured protective glass complex is installed to a jig of the instrument.
  • An area in contact with the jig is determined to be 1 mm square.
  • the metal ball is dropped to a certain position of the protective glass complex at a certain height.
  • a respective measurement varies with a size of a respective substrate and a height of fall.
  • the protective glass complex does not break until a height of about 2 m.
  • the evaluation result is shown in Table 1.
  • Table 1 "OK" indicates that the protective glass complex does not break.
  • the manufactured protective glass complex is installed to a jig of the gauge.
  • An area of the protective glass complex, in contact with the jig, is determined to be 1 mm square.
  • the push-pull gauge is fixed for about 3 minutes.
  • the protective glass complex does not break under a load of about 10 kg for about 3 minutes.
  • a detailed test result is shown in Table 2.
  • the manufactured protective glass complex is installed to a jig of the spectrum analyzer, and transmittance is measured. The measurement is performed 5 times for each thickness of the protective glass complex, and an average of the transmittances is obtained.
  • Data for analysis is evaluated with respect to whether the transmittance is more than 90%.
  • FIG. 6 is a photograph illustrating a broken quartz window
  • FIG. 7 is a photograph illustrating a broken protective glass complex according to an embodiment of the present invention.
  • the protective glass complex according to the present embodiment breaks without being shattered or split. Accordingly, it is evaluated as the protective glass complex has excellent shatter-proof characteristics.
  • the quartz window is roughly and irregularly broken.
  • the protective glass complex according to the present invention may be embodied to be thin and may have excellent strength and hardness, a danger of the protective glass complex itself becoming damaged and scratched due to an external impact may be reduced. Accordingly, a display screen may be stably protected, and display quality deterioration may be prevented. Also, due to excellent shatter-proof characteristics, a danger of injuring a user when the protective glass complex breaks from an external impact is very low.
  • the protective glass complex according to the present invention is expected to effectively and stably protect a display screen of a portable digital device and a time display screen of all kinds of watches.
  • the protective glass complex may be practically applied to all kinds of devices which have to be protected and have a display function.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Surface Treatment Of Glass (AREA)
  • Laminated Bodies (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

A protective glass complex including: a first glass layer formed of first glass; a second glass layer disposed on the first glass layer and formed of second glass; and a binder resin layer disposed between the first glass layer and the second glass layer to bind the first glass layer with the second glass layer and formed of a transparent and curable resin. The binder resin layer is formed of any one of a resin formed by thermally curing a thermosetting resin composition and a resin formed by photo-curing a photo- curable resin composition. Since the protective glass complex is thin and has excellent strength and hardness, the protective glass complex may protect a display screen of a portable digital device and a time display screen of all kinds of watches. Also, due to low manufacturing cost, economical efficiency is excellent.

Description

PROTECTIVE GLASS COMPLEXAND METHOD OFMANUFACTURING
THE SAME
Technical Field The present invention relates to a protective window and a method of manufacturing the protective window, and more particularly, to a protective glass complex and a method of manufacturing the protective glass complex, which is thin and has excellent durability and non-scattering property as well as not becoming deformed and showing no surface damage from an external impact, thereby stably protecting a display screen of a portable digital device or a time display screen of a watch.
Background Art
Currently, various portable digital devices such as a mobile phone, a digital camera, and an MP3 include a display screen. Since portable digital devices are frequently exposed to external elements, a display screen thereof may break or become contaminated by external materials. To solve these problems, an additional window capable of protecting the display screen is disposed above the display screen.
The additional window for protecting the display screen is generally formed of plastic or quartz. However, since a window, formed of plastic, for protecting a display screen is manufactured by injection molding, there is restriction on a process of reducing a thinness. Also, since the plastic is soft, when an external shock is received, the window becomes bent, thereby damaging the display screen. To reduce the screen damage, the plastic window has to be separated from a display screen at more than a predetermined interval, which becomes an obstacle to slim down a portable digital device.
Conversely, since the plastic window is not hard, a surface of the plastic window may be easily scratched by external contact, thereby deteriorating display quality. To overcome the disadvantage of the plastic window, a window formed of quartz is used. While the quartz window may overcome the above disadvantages of the plastic window, workability is not high. Therefore, a defect rate in a manufacturing process is high, and manufacturing costs are high. Also, since the quartz has non-scattering property, a broken piece of quartz, created when the quartz window breaks from an external impact, may inflict an injury on a user.
As described above, conventional windows for protecting a display screen still have problems.
Disclosure of Invention Technical Goals
An aspect of the present invention provides a protective glass complex that is thin, has excellent durability against an external impact to stably protect a display screen, and has excellent shatter-proof characteristics to improve safety.
An aspect of the present invention provides a method of manufacturing the protective glass complex.
Technical Solutions
According to an aspect of the present invention, there is provided a protective glass complex including: a first glass layer formed of first glass; a second glass layer disposed on the first glass layer and formed of second glass; and a binder resin layer.
The binder resin layer may be disposed between the first glass layer and the second glass layer to bind the first glass layer with the second glass layer and formed of a transparent and curable resin. The first glass and the second glass may be formed of borosilicate glass.
Each of the first glass layer and the second glass layer may have a thickness of about 0.1 to about 2 mm. Bubble-free states may be formed on a contact surface between the first glass layer and the binder resin layer and a contact surface between the second glass layer and the binder resin layer, respectively.
The binder resin layer may be formed of any one of a resin formed by thermally curing a thermosetting resin composition, and a resin formed by photo-curing a photo- curable resin composition.
The photo-curable resin composition may include: i) isocyanurate resin having a proportion of about 30 to about 60 % by weight; ii) mercapto resin having a proportion of about 10 to about 30 % by weight; iii) methacrylate monomer having a proportion of about 10 to about 30 % by weight; iv) photoinitiator having a proportion of about 4 to about 10 % by weight; and v) organosilane compound having a proportion of about 1 to about 5 % by weight. The protective glass complex may further include functional layers such as an anti-static layer, an anti-fogging layer, an anti-fingerprint layer, an antireflective coating layer, and an anti-scratch layer. The functional layers may be disposed in a suitable position such as the contact surface or a surface of the protective glass complex.
According to another aspect of the present invention, there is provided a method of manufacturing a protective glass complex, the method including: forming a photo-curable resin composition layer by applying a photo-curable resin composition on a first glass layer; preparing a glass complex layer formed of the first glass layer, the photo-curable resin composition layer, and a second glass layer adhering the second glass layer on the applied photo-curable resin composition layer; removing bubbles from a contact surface between the first glass layer and the photo-curable resin composition layer, and a contact surface between the second glass layer and the photo- curable resin composition layer, and planarizing the photo-curable resin composition; and photo-curing the photo-curable resin composition by irradiating light to the glass complex layer. The method may further include a heat treatment of the glass complex.
When a thermosetting resin composition is used instead of the photo-curable resin composition as the resin composition layer, the irradiating of the light may be omitted.
Also, the method may further include planarizing surfaces of the first glass layer and the second glass layer while manufacturing the first glass layer and the second glass layer. The planarizing may be performed by a roller.
The method may further include grinding the surfaces of the first glass layer and the second glass layer.
Favorable Effects
The protective glass complex according to an embodiment of the present invention may be thinned and have excellent strength and hardness to prevent the protective glass complex from damage and scratches from an external impact. Accordingly, the protective glass complex may stably protect a display screen of a portable device and a time display screen of a watch and may prevent deterioration of display quality of the devices. Also, since the protective glass complex has excellent shatter-proof characteristics, though the protective glass complex may break, there is no injury to a user.
Brief Description of Drawings
FIG. 1 is a top view illustrating a portable device employing a protective glass complex according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view illustrating the protective glass complex cut along an I-F line shown in FIG. 1 ;
FIGS. 3 through 5 are cross-sectional views illustrating a method of manufacturing a protective glass complex, according to an embodiment of the present invention;
FIG. 6 is a photograph illustrating a broken protective glass complex according to an embodiment of the present invention; and
FIG. 7 is a photograph illustrating a broken quartz window.
Best Mode for Carrying Out the Invention
Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the attached drawings. Protective glass complex
FIG. 1 is a top view illustrating a portable device 1000 employing a protective glass complex 100 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating the protective glass complex cut along an I-F line shown in FIG. 1.
Referring to FIGS. 1 and 2, the portable device 1000 includes the protective glass complex 100 disposed separately from a display screen at a predetermined interval. The protective glass complex 100 includes a first glass layer 112, a second glass layer 114, and a binder resin layer 117 disposed between the first glass layer 112 and the second glass layer 114. The first glass layer 112 is formed of a first glass. In the present embodiment, the first glass is borosilicate glass. The second glass layer 114 is formed of a second glass. The second glass is also borosilicate glass.
The first glass layer 112 and the second glass layer 114 have high strength and do not become yellow when exposed to ultraviolet rays. Alternatively, soda-lime silica glass may be used as the first and second glass. However, to prevent yellowing, the soda-lime silica glass must include an additional protective layer, or requires an additional process of removing sodium ions by surface processing.
Accordingly, to prevent display quality deterioration due to the yellowing, it is advantageous to use the borosilicate glass.
A binder resin layer 117 is disposed between the first glass layer 112 and the second glass layer 114. The binder resin layer 117 is mutually adhered to the first glass layer 112 and the second glass layer 114 to bind the first glass layer 112 with the second glass layer 114. The binder resin layer 117 is formed of one of a resin formed by thermally curing a thermosetting resin composition and a resin formed by photo-curing a photo- curable resin composition. The binder resin layer is a transparent polymer resin having a high transparency rate.
Particularly, since the photo-curable resin composition includes an ultraviolet (UV) absorbent, the yellowing of the resin due to exposure to UV light may be prevented and transparency of the protective glass complex may be improved. The photo-curable resin composition includes: i) isocyanurate resin of about 30 to about 60 % by weight; ii) mercapto resin of about 10 to about 30 % by weight; iii) methacrylate monomer of about 10 to about 30 % by weight; iv) photoinitiator of about 4 to about 10 % by weight; and v) organosilane compound of about 1 to about 5 % by weight.
When light is irradiated, the photoinitiator forms a radical and functions as a polymerization initiator when polymerizing the methacrylate monomer.
Acetophenone compound, non-imidazole compound, and triazine compound may be used as the photoinitiator. The photoinitiator may also function as the UV absorbent and may prevent the yellowing of a resin due to exposure to UV.
The thermosetting resin composition may be formed of general transparent and curable resin composition. When applying heat from outside, the thermosetting resin composition is cured to be converted into a thermosetting resin.
Also, the thermosetting resin composition and the photo-curable resin composition may further include a cross-linking agent to perform a cross-linking reaction by irradiating light or applying heat.
The binder resin layer 117 has excellent adhesive property with the first glass layer 112 and the second glass layer 114.
Bubble-free states in which bubbles are removed are formed on an interface formed between the binder resin layer 117 and the first glass layer 112. Similarly, the bubble-free states in which the bubbles are removed are also formed on an interface formed between the binder resin layer 117 and the second glass layer 114. The binder resin layer 117 is planarized and has excellent planarization property. Accordingly, the binder resin layer 117 may closely attached to the first glass layer 112 and the second glass layer 114 and also may improve strength of the protective glass complex 100. Also, the binder resin layer 117 may prevent yellowing and may have properties such as being moisture-proof and having low viscosity.
The binder resin layer 117 may have an index of refraction, similar to the first glass layer 112 and the second glass layer 114. More preferably, the binder resin layer 117 may have an index of refraction identical with the first glass layer 112 and the second glass layer 114. Therefore, designing may be easy when adding various functional layers as well as controlling optical property of light transmitted via the protective glass complex 100.
A thickness of the first glass layer 112 and the second glass layer 114 may be about 0.1 to about 2 mm, which varies with a whole area of the protective glass complex 100.
A metal layer 105 may be formed around a rear surface of the first glass layer 117, opposite to a display screen. Various patterns such as a logo and colors may be printed in an inner surface of the metal layer 105. The metal layer 105 may be formed by deposition. Though not shown, the protective glass complex 100 may further include functional layers such as an anti-static layer, an anti-fogging layer, an anti-fingerprint layer, an antireflective coating layer, and an anti-scratch layer. The functional layers may be disposed in a suitable position such as the contact surface of the protective glass complex 100 or a top surface of the second glass layer 114.
The function layers may include an inorganic oxide such as a Teflon compound having hydrophobicity and titanium compound having super hydrophilicity. Hereinafter, a method of manufacturing the protective glass complex 100 will be described.
Method of Manufacturing the Protective Glass Complex FIGS. 3 through 5 are cross-sectional views illustrating a method of manufacturing a protective glass complex, according to an embodiment of the present invention.
Referring to FIG. 3, a photo-curable resin composition is applied to a first glass layer 112 to form a photo-curable resin composition layer 116. The photo-curable resin composition is applied by spin coating or spray coating a top surface of the first glass layer 112. Referring to FIG. 4, the second glass layer 114 is connected with a top surface of the photo-curable resin composition layer 116. When the second glass layer 114 is disposed, the first glass layer 112, the photo-curable resin composition layer 116, and the second glass layer 114 may be closely attached to others by a roller. In this case, bubbles formed between interfaces may be removed. To remove the bubbles, various additional bubble removing processes may be performed.
Referring to FIG. 5, light is irradiated to a binder resin layer formed of the layers 112, 114, and 116. The light activates the photoinitiator included in the photo- curable resin composition layer 116 to polymerize monomers in the composition. A UV ray having energy of about 15 to about 25 mW/cm2 may be used as the light. The UV ray is irradiated for about 5 minutes.
After irradiating the light, the photo-curable resin composition layer 116 is firstly photo-cured. The firstly photo-cured photo-curable resin composition layer 116 may be cross-linked via an additional heat treatment. The heat treatment is performed at a temperature of about 70 to about 90 0C for about 30 minutes.
Accordingly, the photo-curable resin composition layer 116 is photo-cured to form a solid photo-cured resin layer. The manufactured protective glass complex may be cut into various shapes depending on use such as a digital device or a watch and may be employed to each device.
Before manufacturing the protective glass complex, the first glass and second glass may be planarized to a maximum by an additional rolling process in injection molding.
Hereinafter, performance evaluation result of the protective glass complex according to an embodiment of the present invention will be described.
Surface Hardness Evaluation 1. Tester and Fixtures
- Hardness Measuring instrument, manufactured by Imoto company (22 ID, 1 kgf)
- Hardness Measuring pencil, manufactured by Mitsubishi company, an abrasive paper: sanding more than 400 times. 2. Measurement Method
A wooden part of the pencil is whittled to sharpen a lead of the pencil to expose approximately 3 mm in a cylindrical shape. The lead is disposed perpendicular to the abrasive paper disposed on a flat surface and is ground while drawing a circle such that an end of the lead is flat and has an acute angle. An identical position of the lead is tested once to maintain impartiality of data.
After disposing the pencil on a film surface of the manufactured protective glass complex at an angle of about 45° , the tester is disposed parallel to the film surface. The tester is moved forwardly about 10 mm at a uniform speed. The described measurement method was performed five times while changing a position of a sample.
3. Test Method
Hardness was measured by checking for the pencil generating at least one scratch from the five measurements.
4. Evaluation Result There is no scratch with a pencil of 8H.
Strength Evaluation (1) 1. Tester and Fixtures
- Drop test measuring instrument capable of dropping a ball from a maximum height of about 2 m
- a metal ball of about 5 g
2. Measurement Method
The manufactured protective glass complex is installed to a jig of the instrument. An area in contact with the jig is determined to be 1 mm square. The metal ball is dropped to a certain position of the protective glass complex at a certain height. A respective measurement varies with a size of a respective substrate and a height of fall.
3. Evaluation Method
Whether the protective glass complex breaks is observed.
4. Evaluation Result
The protective glass complex does not break until a height of about 2 m. The evaluation result is shown in Table 1. In Table 1, "OK" indicates that the protective glass complex does not break.
Table 1
Figure imgf000010_0001
Strength Evaluation (2)
1. Tester and Fixtures
- Push-pull Gauge capable of measuring 10 kg 2. Measurement Method
The manufactured protective glass complex is installed to a jig of the gauge. An area of the protective glass complex, in contact with the jig, is determined to be 1 mm square. After applying a pressure of 10 kg to the push-pull gauge, the push-pull gauge is fixed for about 3 minutes.
3. Evaluation Method
Whether the protective glass complex breaks is observed.
4. Evaluation Result
The protective glass complex does not break under a load of about 10 kg for about 3 minutes. A detailed test result is shown in Table 2. Table 2
Figure imgf000011_0001
Transmittance Evaluation
1. Tester and fixture - Spectrum analyzer
2. Measurement Method
The manufactured protective glass complex is installed to a jig of the spectrum analyzer, and transmittance is measured. The measurement is performed 5 times for each thickness of the protective glass complex, and an average of the transmittances is obtained.
3. Evaluation Method
Data for analysis is evaluated with respect to whether the transmittance is more than 90%.
4. Evaluation Result Regardless of a thickness of a sample, transmittances are more than 90% each time. The result is shown in detail in Table 3. Table 3
Figure imgf000011_0002
Figure imgf000012_0001
Non-scattering property Evaluation
The protective glass complex according to the present embodiment and a quartz window break when using a metal ball, and modes of breaking are observed.
FIG. 6 is a photograph illustrating a broken quartz window, and FIG. 7 is a photograph illustrating a broken protective glass complex according to an embodiment of the present invention.
Referring to FIG. 6, the protective glass complex according to the present embodiment breaks without being shattered or split. Accordingly, it is evaluated as the protective glass complex has excellent shatter-proof characteristics.
Referring to FIG. 7, the quartz window is roughly and irregularly broken.
Industrial Applicability
Since the protective glass complex according to the present invention may be embodied to be thin and may have excellent strength and hardness, a danger of the protective glass complex itself becoming damaged and scratched due to an external impact may be reduced. Accordingly, a display screen may be stably protected, and display quality deterioration may be prevented. Also, due to excellent shatter-proof characteristics, a danger of injuring a user when the protective glass complex breaks from an external impact is very low.
Also, a rate of reducing defects occurring while manufacturing the protective glass complex is high, and process efficiency is excellent due to a low manufacturing cost.
The protective glass complex according to the present invention is expected to effectively and stably protect a display screen of a portable digital device and a time display screen of all kinds of watches. In addition, the protective glass complex may be practically applied to all kinds of devices which have to be protected and have a display function. Although a few embodiments of the present invention have been shown and described, the present invention is not limited to the described embodiments. Instead, it would be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A protective glass complex comprising: a first glass layer formed of first glass; a second glass layer disposed on the first glass layer and formed of second glass; and a binder resin layer disposed between the first glass layer and the second glass layer to bind the first glass layer with the second glass layer and formed of a transparent and curable resin.
2. The protective glass complex of claim 1, wherein the first glass and the second glass are formed of borosilicate glass.
3. The protective glass complex of claim 1, wherein each of the first glass layer and the second glass layer has a thickness of about 0.1 to about 2 mm.
4. The protective glass complex of claim 1, wherein bubble-free states are formed on a contact surface between the first glass layer and the binder resin layer and a contact surface between the second glass layer and the binder resin layer, respectively.
5. The protective glass complex of claim 1, wherein a refractive index of the binder resin layer is identical with refractive indexes of the first glass layer and the second glass layer.
6. The protective glass complex of claim 1, wherein the binder resin layer is formed of any one of a resin formed by thermally curing a thermosetting resin composition, and a resin formed by photo-curing a photo-curable resin composition.
7. The protective glass complex of claim 6, wherein the photo-curable resin composition includes an ultraviolet absorbent.
8. The protective glass complex of claim 6, wherein the photo-curable resin composition comprises: i) isocyanurate resin of about 30 to about 60 % by weight; ii) mercapto resin of about 10 to about 30 % by weight; iii) methacrylate monomer of about 10 to about 30 % by weight; iv) photoinitiator of about 4 to about 10 % by weight; and v) organosilane compound of about 1 to about 5 % by weight.
9. The protective glass complex of claim 1, further comprising at least one layer selected from the group consisting of an anti-static layer, an anti-fogging layer, an anti- fingerprint layer, an antireflective coating layer, and an anti-scratch layer.
10. A method of manufacturing a protective glass complex, the method comprising: forming a photo-curable resin composition layer by applying a photo-curable resin composition on a first glass layer; preparing a glass complex layer formed of the first glass layer, the photo- curable resin composition layer, and a second glass layer adhering the second glass layer on the applied photo-curable resin composition layer; removing bubbles from a contact surface between the first glass layer and the photo- curable resin composition layer, and a contact surface between the second glass layer and the photo-curable resin composition layer, and planarizing the photo-curable resin composition; and photo-curing the photo-curable resin composition by irradiating light to the glass complex layer.
11. The method of claim 10, further comprising a heat treatment of the glass complex.
12. The method of claim 10, further comprising planarizing surfaces of the first glass layer and the second glass layer while manufacturing the first glass layer and the second glass layer.
13. The method of claim 10, further comprising grinding the surfaces of the first glass layer and the second glass layer.
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