公开(公告)号：US20210024403A1

公开(公告)日：2021-01-28

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 ,  C03C4/00

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：US20240300846A1

公开(公告)日：2024-09-12

申请号：US18663496

申请日：2024-05-14

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 having 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：US20200299179A1

公开(公告)日：2020-09-24

申请号：US16819696

申请日：2020-03-16

Applicant: AGC INC.

Inventor： Motoyuki HIROSE ,  Takashi ENOMOTO

IPC: C03C3/091 ,  C03B5/225

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：US20220234939A1

公开(公告)日：2022-07-28

申请号：US17578650

申请日：2022-01-19

Applicant: AGC INC.

Inventor： Motoyuki HIROSE

IPC: C03C3/087 ,  C03C1/00

Abstract: The present invention relates to a float glass substrate including an alkali-free glass, the float glass substrate having a Cl content of from 0.10 to 0.50 mass %, containing substantially no SnO2, and having a Pt content of, by mass, from 0.001 to 0.30 ppm. The float glass substrate may have a Rh content of, by mass, from 0.001 to 0.50 ppm.

公开(公告)号：US20200299180A1

公开(公告)日：2020-09-24

申请号：US16819753

申请日：2020-03-16

Applicant: AGC INC.

Inventor： Motoyuki HIROSE ,  Takashi ENOMOTO

IPC: C03C3/091 ,  C03B5/225

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：US20190185368A1

公开(公告)日：2019-06-20

申请号：US16282363

申请日：2019-02-22

Applicant: AGC Inc.

Inventor： Hirofumi TOKUNAGA ,  Kazutaka ONO ,  Motoyuki HIROSE

IPC: C03C3/093 ,  C03C3/087

CPC classification number: C03C3/093 ,  C03C3/087 ,  C03C3/091

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, SiO2from 65 to 75, Al2O3from 9 to 15, B2O3from 0 to 3, MgOfrom 0 to 12, CaOfrom 0 to 8, SrOfrom 0 to 6, and BaOfrom 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.