JP2017525650A - 対照を成す拡散率を有するイオン交換可能なコア及びクラッドを備えた積層ガラス製品、及びその製造方法 - Google Patents

対照を成す拡散率を有するイオン交換可能なコア及びクラッドを備えた積層ガラス製品、及びその製造方法 Download PDF

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Publication number
JP2017525650A
JP2017525650A JP2017511584A JP2017511584A JP2017525650A JP 2017525650 A JP2017525650 A JP 2017525650A JP 2017511584 A JP2017511584 A JP 2017511584A JP 2017511584 A JP2017511584 A JP 2017511584A JP 2017525650 A JP2017525650 A JP 2017525650A
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Japan
Prior art keywords
layer
laminated glass
glass product
ion exchange
compressive stress
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Pending
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JP2017511584A
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English (en)
Japanese (ja)
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JP2017525650A5 (enExample
Inventor
ポン，ガオヂュー
ヂョウ，チュンフォン
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Corning Inc
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Corning Inc
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Application filed by Corning Inc filed Critical Corning Inc
Publication of JP2017525650A publication Critical patent/JP2017525650A/ja
Publication of JP2017525650A5 publication Critical patent/JP2017525650A5/ja
Pending legal-status Critical Current

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    • 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
    • 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
    • B32B17/10045—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 with at least one intermediate layer consisting of a glass sheet
    • 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
    • B32B17/10082—Properties of the bulk of a glass sheet
    • B32B17/10119—Properties of the bulk of a glass sheet having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate
    • 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
    • B32B17/10128—Treatment of at least one glass sheet
    • B32B17/10137—Chemical strengthening
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/02—Forming molten glass coated with coloured layers; Forming molten glass of different compositions or layers; Forming molten glass comprising reinforcements or inserts
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/02—Tempering or quenching glass products using liquid
    • C03B27/03—Tempering or quenching glass products using liquid the liquid being a molten metal or a molten salt
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
    • C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
    • C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Surface Treatment Of Glass (AREA)
JP2017511584A 2014-08-28 2015-08-25 対照を成す拡散率を有するイオン交換可能なコア及びクラッドを備えた積層ガラス製品、及びその製造方法 Pending JP2017525650A (ja)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201462043011P 2014-08-28 2014-08-28
US62/043,011 2014-08-28
PCT/US2015/046685 WO2016033038A1 (en) 2014-08-28 2015-08-25 Laminated glass article with ion exchangeable core and clad layers having diffusivity contrast and method of making the same

Publications (2)

Publication Number Publication Date
JP2017525650A true JP2017525650A (ja) 2017-09-07
JP2017525650A5 JP2017525650A5 (enExample) 2018-10-04

Family

ID=54140643

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2017511584A Pending JP2017525650A (ja) 2014-08-28 2015-08-25 対照を成す拡散率を有するイオン交換可能なコア及びクラッドを備えた積層ガラス製品、及びその製造方法

Country Status (6)

Country Link
US (2) US20170282503A1 (enExample)
EP (1) EP3186076A1 (enExample)
JP (1) JP2017525650A (enExample)
KR (1) KR20170047344A (enExample)
CN (1) CN107207315A (enExample)
WO (1) WO2016033038A1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021511281A (ja) * 2018-01-24 2021-05-06 コーニング インコーポレイテッド 深みでの応力の大きさが大きいガラス系物品

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150135415A (ko) * 2013-03-25 2015-12-02 코닝 인코포레이티드 저-tg 클래드 층을 사용하는 텍스처링된 유리 라미네이트
US10669194B2 (en) 2014-10-22 2020-06-02 Corning Incorporated Glass strengthening by ion exchange and lamination
EP3377453A1 (en) * 2015-11-20 2018-09-26 Corning Incorporated Laminated glass ribbons and apparatuses for forming laminated glass ribbons
CN108779025B (zh) * 2016-04-01 2021-08-10 日本电气硝子株式会社 化学强化玻璃
WO2018013506A1 (en) 2016-07-15 2018-01-18 Corning Incorporated Lighting unit with laminate structure
US11307352B2 (en) 2016-07-15 2022-04-19 Corning Incorporated Optical waveguide article with laminate structure and method for forming the same
US11419231B1 (en) 2016-09-22 2022-08-16 Apple Inc. Forming glass covers for electronic devices
US11535551B2 (en) * 2016-09-23 2022-12-27 Apple Inc. Thermoformed cover glass for an electronic device
US10800141B2 (en) 2016-09-23 2020-10-13 Apple Inc. Electronic device having a glass component with crack hindering internal stress regions
US11565506B2 (en) * 2016-09-23 2023-01-31 Apple Inc. Thermoformed cover glass for an electronic device
CN110446604B (zh) * 2017-01-18 2022-09-23 康宁股份有限公司 具有工程应力分布的基于玻璃的制品及制造方法
US20190030861A1 (en) * 2017-07-27 2019-01-31 Corning Incorporated Composite laminate with high depth of compression
US11066322B2 (en) 2017-12-01 2021-07-20 Apple Inc. Selectively heat-treated glass-ceramic for an electronic device
US10611666B2 (en) 2017-12-01 2020-04-07 Apple Inc. Controlled crystallization of glass ceramics for electronic devices
KR20210042340A (ko) * 2018-08-10 2021-04-19 코닝 인코포레이티드 라미네이트 유리 시트들을 형성하는 방법 및 장치
US11420900B2 (en) 2018-09-26 2022-08-23 Apple Inc. Localized control of bulk material properties
US12037282B2 (en) * 2018-11-01 2024-07-16 Corning Incorporated Strengthened glass articles with reduced delayed breakage and methods of making the same
US11648549B2 (en) * 2018-11-29 2023-05-16 Corning Incorporated Ion exchange systems and methods for ion exchanging glass articles
WO2020205257A1 (en) 2019-03-29 2020-10-08 Corning Incorporated Scratch and damage resistant laminated glass articles
TWI839488B (zh) 2019-03-29 2024-04-21 美商康寧公司 耐刮擦及抗損傷的疊層玻璃製品
US11680010B2 (en) 2019-07-09 2023-06-20 Apple Inc. Evaluation of transparent components for electronic devices
WO2021021393A1 (en) 2019-07-31 2021-02-04 Corning Incorporated Salt bath compositions for strengthening glass articles, methods for using the salt bath compositions to strengthen glass articles, and glass articles strengthened thereby
US11697617B2 (en) * 2019-08-06 2023-07-11 Corning Incorporated Glass laminate with buried stress spikes to arrest cracks and methods of making the same
JP2023517710A (ja) 2020-03-17 2023-04-26 コーニング インコーポレイテッド ガラス物品を強化するための塩浴組成物、塩浴システム、および方法
CN115955798A (zh) 2020-03-28 2023-04-11 苹果公司 用于电子设备壳体的玻璃覆盖构件
US11460892B2 (en) 2020-03-28 2022-10-04 Apple Inc. Glass cover member for an electronic device enclosure
US11666273B2 (en) 2020-05-20 2023-06-06 Apple Inc. Electronic device enclosure including a glass ceramic region
WO2022039932A1 (en) 2020-08-17 2022-02-24 Corning Incorporated Systems and methods for recycling waste ion exchange materials
WO2022060584A2 (en) 2020-09-15 2022-03-24 Corning Incorporated Salt bath systems for strengthening glass articles and methods for regenerating molten salt
CN116635340B (zh) 2020-12-17 2025-12-09 苹果公司 用于便携式电子设备的玻璃部件的形成和粘结
US12065372B2 (en) 2020-12-17 2024-08-20 Apple Inc. Fluid forming a glass component for a portable electronic device
CN116783152A (zh) 2020-12-23 2023-09-19 苹果公司 用于电子设备的透明部件的基于激光的切割
CN117642368A (zh) 2021-06-11 2024-03-01 康宁公司 玻璃组合物以及包含玻璃组合物的强化玻璃层压制品
US12384718B2 (en) 2021-06-11 2025-08-12 Corning Incorporated Glass laminate articles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008522950A (ja) * 2004-12-13 2008-07-03 コーニング インコーポレイテッド 高められた耐衝撃／静荷重強度を有するガラス積層基板
JP2011093728A (ja) * 2009-10-28 2011-05-12 Nippon Electric Glass Co Ltd 強化板ガラス及びその製造方法
JP2014521582A (ja) * 2011-07-25 2014-08-28 コーニング インコーポレイテッド 積層及びイオン交換により強化されたガラス積層品及びその作製方法
JP2015098412A (ja) * 2013-11-19 2015-05-28 日本電気硝子株式会社 強化ガラス板、及び強化ガラス板の製造方法

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737294A (en) * 1970-08-28 1973-06-05 Corning Glass Works Method for making multi-layer laminated bodies
NL7800157A (nl) * 1978-01-06 1979-07-10 Philips Nv Werkwijze voor de vervaardiging van optische fibers voor telecommunicatie.
US4214886A (en) 1979-04-05 1980-07-29 Corning Glass Works Forming laminated sheet glass
US4372767A (en) * 1981-10-19 1983-02-08 Eotec Corporation Method of manufacturing optical fibers
US5559060A (en) * 1992-05-22 1996-09-24 Corning Incorporated Glass for laminated glass articles
JP2006056768A (ja) * 2004-07-23 2006-03-02 Nippon Sheet Glass Co Ltd 屈折率分布型ロッドレンズ用クラッドガラス組成物、およびそれを用いた屈折率分布型ロッドレンズ母ガラスロッド、ならびに屈折率分布型ロッドレンズ、およびその製造方法
DE102007063463B4 (de) * 2007-12-20 2010-06-10 Schott Ag Kernglas im Alkali-Zink-Silikat-Glassystem für einen faseroptischen Lichtleiter und die Verwendung des Kernglases in einem Lichtleiter
JP5670901B2 (ja) 2008-08-08 2015-02-18 コーニング インコーポレイテッド 強化ガラス物品およびその製造方法
US9302937B2 (en) * 2010-05-14 2016-04-05 Corning Incorporated Damage-resistant glass articles and method
US20120280368A1 (en) * 2011-05-06 2012-11-08 Sean Matthew Garner Laminated structure for semiconductor devices
US10280112B2 (en) * 2011-08-19 2019-05-07 Corning Incorporated Ion exchanged glass with high resistance to sharp contact failure and articles made therefrom
KR102067741B1 (ko) * 2011-10-25 2020-01-20 코닝 인코포레이티드 약품 포장용 유리
WO2013063277A1 (en) * 2011-10-25 2013-05-02 Corning Incorporated Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients
JP2015006959A (ja) * 2011-10-31 2015-01-15 旭硝子株式会社 ガラス基板、ガラス基板の製造方法、およびカバーガラス
US9359251B2 (en) * 2012-02-29 2016-06-07 Corning Incorporated Ion exchanged glasses via non-error function compressive stress profiles
WO2013130665A2 (en) * 2012-02-29 2013-09-06 Corning Incorporated Low cte, ion-exchangeable glass compositions and glass articles comprising the same
TWI614227B (zh) * 2012-02-29 2018-02-11 康寧公司 低ｃｔｅ之無鹼硼鋁矽酸鹽玻璃組成物及包含其之玻璃物件
TWI564262B (zh) * 2012-02-29 2017-01-01 康寧公司 高ｃｔｅ之硼矽酸鉀核心玻璃與包含其之玻璃物件
US9212081B2 (en) * 2012-11-21 2015-12-15 Corning Incorporated Methods of cutting a laminate strengthened glass substrate
TWI699341B (zh) * 2013-01-31 2020-07-21 美商康寧公司 虛擬化(fictivated)玻璃及其製造方法
US9714192B2 (en) * 2013-02-08 2017-07-25 Corning Incorporated Ion exchangeable glass with advantaged stress profile
KR102385315B1 (ko) * 2014-03-13 2022-04-11 코닝 인코포레이티드 유리 제품 및 이의 형성 방법
WO2015148618A1 (en) * 2014-03-27 2015-10-01 Corning Incorporated Glass article
TWI649277B (zh) * 2014-05-07 2019-02-01 美商康寧公司 成形玻璃物件及其形成方法
KR102433785B1 (ko) * 2014-05-07 2022-08-18 코닝 인코포레이티드 적층 유리 제품 및 이의 형성방법
EP3183223A1 (en) * 2014-08-21 2017-06-28 Corning Incorporated Methods for preventing blisters in laminated glass articles and laminated glass articles formed therefrom
KR102533219B1 (ko) * 2016-11-30 2023-05-16 코닝 인코포레이티드 퓨전-형성 가능한 자동차용 유리 조성물, 물품 및 적층물

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008522950A (ja) * 2004-12-13 2008-07-03 コーニング インコーポレイテッド 高められた耐衝撃／静荷重強度を有するガラス積層基板
JP2011093728A (ja) * 2009-10-28 2011-05-12 Nippon Electric Glass Co Ltd 強化板ガラス及びその製造方法
JP2014521582A (ja) * 2011-07-25 2014-08-28 コーニング インコーポレイテッド 積層及びイオン交換により強化されたガラス積層品及びその作製方法
JP2015098412A (ja) * 2013-11-19 2015-05-28 日本電気硝子株式会社 強化ガラス板、及び強化ガラス板の製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021511281A (ja) * 2018-01-24 2021-05-06 コーニング インコーポレイテッド 深みでの応力の大きさが大きいガラス系物品
JP7312756B2 (ja) 2018-01-24 2023-07-21 コーニング インコーポレイテッド 深みでの応力の大きさが大きいガラス系物品
US11724965B2 (en) 2018-01-24 2023-08-15 Corning Incorporated Glass-based articles having high stress magnitude at depth

Also Published As

Publication number Publication date
US20220009204A1 (en) 2022-01-13
CN107207315A (zh) 2017-09-26
EP3186076A1 (en) 2017-07-05
KR20170047344A (ko) 2017-05-04
US20170282503A1 (en) 2017-10-05
WO2016033038A1 (en) 2016-03-03

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