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

IPC: C03C3/087 ,  C03C3/091 ,  C03B5/18

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.

公开(公告)号：US20190248697A1

公开(公告)日：2019-08-15

申请号：US16392714

申请日：2019-04-24

Applicant: AGC Inc.

Inventor： Hirofumi TOKUNAGA ,  Kazutaka Ono ,  Motoyuki Hirose

IPC: C03C3/091 ,  C03C3/087

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.

公开(公告)号：US11718553B2

公开(公告)日：2023-08-08

申请号：US16819696

申请日：2020-03-16

Applicant: AGC INC.

Inventor： Motoyuki Hirose ,  Takashi Enomoto

IPC: C03C3/091 ,  C03B5/225 ,  G11B5/73

CPC classification number: C03C3/091 ,  C03B5/2252 ,  G11B5/73921 ,  C03C2201/80

Abstract: An alkali-free glass substrate contains, as represented by mass % based on oxides: 54% to 68% of SiO2; 10% to 25% of Al2O3; 0.1% to 5.5% of B2O3; and 8% to 26% of MgO+CaO+SrO+BaO. The alkali-free glass substrate has β-OH of 0.15 mm−1 to 0.35 mm−1, and a Cl content of 0.15 to 0.3 mass %. A bubble growth index I of the alkali-free glass substrate given by the following formula is 320 or more: I=590.5×[β-OH]+874.1×[Cl]−5.7×[B2O3]−33.3. In the formula, [β-OH] is β-OH of the alkali-free glass substrate in mm−1, [Cl] is the Cl content of the alkali-free glass substrate in mass %, and [B2O3] is a B2O3 content of the alkali-free glass substrate in mass %.

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

IPC: C03C3/087 ,  C03C3/091 ,  C03C3/093

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.

公开(公告)号：US20190084860A1

公开(公告)日：2019-03-21

申请号：US16135682

申请日：2018-09-19

Applicant: AGC INC.

Inventor： Motoyuki Hirose ,  Takashi Enomoto

IPC: C03B5/225 ,  C03C3/091 ,  C03C3/087 ,  C03C3/078

Abstract: The present invention relates to an alkali-free glass substrate in which when the alkali-free glass substrate is melted, and while holding a temperature at 1400° C., reduced in pressure from an atmospheric pressure to 33.33 kPa at a constant pressure reduction rate for 20 minutes and held at 33.33 kPa for 5 minutes, a diameter of a grown bubble is at least 3 times a diameter of an initial bubble. A bubble having a diameter of 0.1 to 0.3 mm contained in a molten glass at 1400° C. before starting pressure reduction is defined as the initial bubble. A bubble after held at 33.33 kPa for 5 minutes corresponding to the initial bubble is defined as a grown bubble.

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

IPC: C03C3/087 ,  C03B17/06 ,  C03C3/091 ,  C03C4/00

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.

公开(公告)号：US11584680B2

公开(公告)日：2023-02-21

申请号：US16819753

申请日：2020-03-16

Applicant: AGC INC.

Inventor： Motoyuki Hirose ,  Takashi Enomoto

IPC: B32B15/04 ,  B32B17/06 ,  C03C3/091 ,  C03B5/225 ,  C03C3/085

Abstract: An alkali-free glass substrate contains, as represented by mass % based on oxides: 54% to 66% of SiO2; 10% to 23% of Al2O3; 6% to 12% of B2O3; and 8% to 26% of MgO+CaO+SrO+BaO. The alkali-free glass substrate has β-OH of 0.15 mm−1 to 0.5 mm−1, and a Cl content of 0.1 to 0.35 mass %. A bubble growth index I of the alkali-free glass substrate given by the following formula is 280 or more: I=590.5×[β-OH]+874.1×[Cl]−5.7×[B2O3]−33.3. In the formula, [β-OH] is β-OH of the alkali-free glass substrate in mm−1, [Cl] is the Cl content of the alkali-free glass substrate in mass %, and [B2O3] is a B2O3 content of the alkali-free glass substrate in mass %.

公开(公告)号：US10974986B2

公开(公告)日：2021-04-13

申请号：US16135682

申请日：2018-09-19

Applicant: AGC INC.

Inventor： Motoyuki Hirose ,  Takashi Enomoto

IPC: C03C3/085 ,  C03C3/087 ,  C03C3/11 ,  C03B5/225 ,  C03C3/091 ,  C03C3/078 ,  C03B5/235

Abstract: The present invention relates to an alkali-free glass substrate in which when the alkali-free glass substrate is melted, and while holding a temperature at 1400° C., reduced in pressure from an atmospheric pressure to 33.33 kPa at a constant pressure reduction rate for 20 minutes and held at 33.33 kPa for 5 minutes, a diameter of a grown bubble is at least 3 times a diameter of an initial bubble. A bubble having a diameter of 0.1 to 0.3 mm contained in a molten glass at 1400° C. before starting pressure reduction is defined as the initial bubble. A bubble after held at 33.33 kPa for 5 minutes corresponding to the initial bubble is defined as a grown bubble.