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公开(公告)号：US10822264B2
公开(公告)日：2020-11-03
申请号：US15458519
申请日：2017-03-14
Applicant: AGC INC.
Inventor： Tetsushi Takiguchi , Shunji Inoue , Kazutaka Ono , Hirofumi Tokunaga , Jun Akiyama , Yasumasa Kato , Taketoshi Taniguchi
Abstract: The present invention relates to an alkali-free glass substrate, in which when two arbitrary sites in one main surface thereof are selected, an absolute value of a difference between a thermal shrinkage ratio in an arbitrary direction at one site and a thermal shrinkage ratio in a direction orthogonal to the arbitrary direction at another site is 2 ppm or less, provided that the thermal shrinkage ratio is calculated by measuring a deformation amount in a measuring direction of the glass substrate between before and after a heat treatment of raising a temperature from normal temperature to 600° C. at 100° C./hour, holding the glass substrate at 600° C. for 80 minutes, and lowering the temperature from 600° C. to normal temperature at 100° C./hour.
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公开(公告)号：US10730786B2
公开(公告)日：2020-08-04
申请号：US16392714
申请日：2019-04-24
Applicant: AGC INC.
Inventor： Hirofumi Tokunaga , Kazutaka Ono , Motoyuki Hirose
Abstract: The present invention relates to an alkali-free glass and a method for producing the same. More specifically, the present invention relates to an alkali-free glass suitable as a glass for substrates of various displays such as liquid crystal display, and a method for producing the same. According to the present invention, an alkali-free glass suitable as a glass for display substrates, in which inclusion of bubbles is greatly reduced by virtue of containing a refining agent and suppressing the stirring reboil, is obtained.
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公开(公告)号：US12017953B2
公开(公告)日：2024-06-25
申请号：US17070035
申请日：2020-10-14
Applicant: AGC Inc.
Inventor： Hirofumi Tokunaga , Kazutaka Ono , Motoyuki Hirose
CPC classification number: C03C3/087 , C03B17/064 , C03C3/091 , C03C4/0085 , C03C2203/10
Abstract: An alkali-free glass has a strain point of 650° C. or more, an average coefficient of thermal expansion at 50 to 350° C. of from 30×10−7 to 45×10−7/° C., and a temperature T2 at which a glass viscosity reaches 102 dPa·s of from 1,500 to 1,800° C. The alkali-free glass contains, as represented by mol % based on oxides, SiO2: from 62 to 70%, Al2O3: from 9 to 16% B2O3: from 0 to 12%, MgO: from 3 to 10%, CaO: from 4 to 12%, SrO: from 0 to 6%, and Fe2O3: from 0.001 to 0.04%, provided that MgO+CaO+SrO+BaO is from 12 to 25%. The alkali-free glass has a β-OH value of from 0.35 to 0.85/mm.
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公开(公告)号：US11897812B2
公开(公告)日：2024-02-13
申请号：US17860443
申请日：2022-07-08
Applicant: AGC Inc.
Inventor： Hirofumi Tokunaga , Kazutaka Ono
CPC classification number: C03C3/087 , C03C3/091 , C03C2201/10 , C03C2203/10
Abstract: An alkali free glass has an average coefficient of thermal expansion at 50 to 350° C. of 30×10−7 to 43×10−7/° C., a Young's modulus of 88 GPa or more, a strain point of 650 to 725° C., a temperature T4 at which a viscosity reaches 104 dPa·s of 1,290° C. or lower, a glass surface devitrification temperature (Tc) of T4+20° C. or lower, and a temperature T2 at which the viscosity reaches 102 dPa·s of 1,680° C. or lower. The alkali free glass contains, as represented by mol % based on oxides, 62 to 67% of SiO2, 12.5 to 16.5% of Al2O3, 0 to 3% of B2O3, 8 to 13% of MgO, 6 to 12% of CaO, 0.5 to 4% of SrO, and 0 to 0.5% of BaO. MgO+CaO+SrO+BaO is 18 to 22%, and MgO/CaO is 0.8 to 1.33.
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Patent Agency Ranking
公开(公告)号：US12071370B2
公开(公告)日：2024-08-27
申请号：US17160468
申请日：2021-01-28
Applicant: AGC Inc.
Inventor： Hirofumi Tokunaga , Daisuke Kobayashi , Kazutaka Ono , Atsuyoshi Takenaka , Yoshitaka Maeyanagi
CPC classification number: C03C21/008 , C03C3/087 , C03C3/091 , C03C17/009 , C03C19/00 , G02F1/133512 , C03C2203/10
Abstract: The present invention relates to a glass substrate including a pair of main surfaces and an end surface, and having a surface layer diffusion Sn atom concentration of 2.0×1018 atomic/cm3 or more and 1.4×1019 atomic/cm3 or less in at least one of the main surfaces, the surface layer diffusion Sn atom concentration being obtained by subtracting an Sn atom concentration of an inside of the glass substrate from an Sn atom concentration of a surface layer of the glass substrate, in which the Sn atom concentration of a surface layer of the glass substrate is defined as an Sn atom concentration at a depth of 0.1 to 0.3 μm from the main surface and the Sn atom concentration of an inside of the glass substrate is defined as an Sn atom concentration at a depth of 9.0 to 9.2 μm from the main surface.
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公开(公告)号：US11414339B2
公开(公告)日：2022-08-16
申请号：US17017891
申请日：2020-09-11
Applicant: AGC Inc.
Inventor： Hirofumi Tokunaga , Kazutaka Ono
Abstract: An alkali free glass has an average coefficient of thermal expansion at 50 to 350° C. of 30×10−7 to 43×10−7/° C., a Young's modulus of 88 GPa or more, a strain point of 650 to 725° C., a temperature T4 at which a viscosity reaches 104 dPa·s of 1,290° C. or lower, a glass surface devitrification temperature (Tc) of T4+20° C. or lower, and a temperature T2 at which the viscosity reaches 102 dPa·s of 1,680° C. or lower. The alkali free glass contains, as represented by mol % based on oxides, 62 to 67% of SiO2, 12.5 to 16.5% of Al2O3, 0 to 3% of B2O3, 8 to 13% of MgO, 6 to 12% of CaO, 0.5 to 4% of SrO, and 0 to 0.5% of BaO. MgO+CaO+SrO+BaO is 18 to 22%, and MgO/CaO is 0.8 to 1.33.
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公开(公告)号：US12122713B2
公开(公告)日：2024-10-22
申请号：US17016646
申请日：2020-09-10
Applicant: AGC INC.
Inventor： Hirofumi Tokunaga , Kazutaka Ono
IPC: C03C3/087 , C03C3/091 , G11B5/73 , G11B7/2531
CPC classification number: C03C3/087 , C03C3/091 , G11B5/73921 , G11B7/2531 , C03C2201/12 , C03C2203/20
Abstract: A glass has a density of 2.60 g/cm3 or lower, a Young's modulus of 88 GPa or more, a strain point of 650 to 720° C., a temperature T4 at which a glass viscosity reaches 104 dPa·s of 1,320° C. or lower, a glass surface devitrification temperature (Tc) of T4+20° C. or lower, and an average coefficient of thermal expansion of 30×10−7 to 43×10−7/° C. at 50 to 350° C. The glass contains, as represented by mol % based on oxides, 50 to 80% of SiO2, 8 to 20% of Al2O3, 0 to 0.5% in total of at least one kind of alkali metal oxide selected from the group consisting of Li2O, Na2O and K2O, and 0 to 1% of P2O5.
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公开(公告)号：US11066325B2
公开(公告)日：2021-07-20
申请号：US16161220
申请日：2018-10-16
Applicant: AGC Inc.
Inventor： Hirofumi Tokunaga , Kazutaka Ono
IPC: C03C3/091
Abstract: To provide an alkali-free glass having a high specific elastic modulus, a suitable strain point, a low density, a not too low thermal expansion coefficient, a good clarity and a good solubility.
An alkali-free glass, which comprises, as represented by mol % based on oxides, SiO2: 62 to 70%, Al2O3: 11 to 14%, B2O3: 3 to 6%, MgO: 7 to 10%, CaO: 3 to 9%, SrO: 1 to 5% and BaO: 0 to 1%, wherein [SiO2]+0.7[Al2O3]+1.2[B2O3]+0.5[MgO]+0.4[CaO]−0.25[SrO]−0.88[BaO] is at least 85, [SiO2]+0.45[Al2O3]+0.21[B2O3]−0.042[MgO]+0.042[CaO]+0.15[SrO]+0.38[BaO] is from 72 to 75, 0.4[SiO2]+0.4[Al2O3]+0.25[B2O3]−0.7[MgO]−0.88[CaO]−1.4[SrO]−1.7[BaO] is at most 19, the specific modulus is at least 32 MN·m/kg, the strain point is from 690 to 710° C., the density is at most 2.54 g/cm3, the average thermal expansion coefficient at from 50 to 350° C. is at least 35×10−7/° C., and the temperature T2 at which the glass viscosity reaches 102 dPa·s is from 1,610 to 1,680° C.-
公开(公告)号：US11053160B2
公开(公告)日：2021-07-06
申请号：US16282363
申请日：2019-02-22
Applicant: AGC Inc.
Inventor： Hirofumi Tokunaga , Kazutaka Ono , Motoyuki Hirose
Abstract: To provide an alkali-free glass, of which the compaction is low, the strain point is high, and the ultraviolet transmittance is high, and which is easy to melt.
An alkali-free glass, which comprises, as represented by mol % based on oxides, SiO2
from 65 to 75, Al2O3
from 9 to 15, B2O3
from 0 to 3, MgO
from 0 to 12, CaO
from 0 to 8, SrO
from 0 to 6, and BaO
from 0 to 5, wherein MgO+CaO+SrO+BaO is from 12 to 22, and 4.84[Fe2O3]+5.65[Na2O]+4.03[K2O]+4.55[SnO2] is at most 0.55, and of which the compaction is at most 80 ppm.
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