公开(公告)号：US20250034029A1

公开(公告)日：2025-01-30

申请号：US18911496

申请日：2024-10-10

Applicant: AGC Inc.

Inventor： Takeyuki KATO ,  Yuya HAMADA ,  Seiji INABA

IPC: C03C3/085 ,  C03B17/06 ,  C03C3/087

Abstract: The present invention relates to a glass including, in mol % in terms of oxides: 68% or more of SiO2; 0.1% to 8% of Al2O3; and 0.1% to 4% of SrO, in which [SiO2]+[B2O3] is 88% or more, [B2O3]−([RO]+[R2O]−[Al2O3]) is 27% or less, a relative dielectric constant at 25° C. and a frequency of 10 GHz is 4.5 or less, a dielectric loss tangent at 25° C. and a frequency of 10 GHz is 0.005 or less, ΔAbs-OH is 4.0 or less, a total content (RO) of MgO, CaO, SrO, and BaO is more than 0% to 6%, a total content (R2O) of Li2O, Na2O, and K2O is 0% to 1%, [Al2O3]−[RO] is −3% to less than 8%, [Al2O3]×[RO] is more than 0 to 30, [MgO]+[CaO] is 0.1% to 5.9%, and [MgO]/([MgO]+[Al2O3]) is 0 to 0.45.

公开(公告)号：US20230202907A1

公开(公告)日：2023-06-29

申请号：US18173378

申请日：2023-02-23

Applicant: AGC Inc.

Inventor： Yusaku MATSUO ,  Hiroyuki HIJIYA ,  Yuya HAMADA ,  Yutaka KUROIWA

IPC: C03C3/091 ,  C03C4/16

CPC classification number: C03C3/091 ,  C03C4/16

Abstract: An alkali-free glass includes, as represented by mol % based on oxides: 50 to 80% of SiO2; 2 to 6% of Al2O3; 18 to 35% of B2O3; 1 to 6% of MgO; 0 to 6% of CaO; 0 to 6% of SrO; and 0 to 3% of BaO. A formula (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the formula (A) is 2% or more and 6% or less. A formula (B) is [Al2O3]—([MgO]+[CaO]+[SrO]+[BaO]), and a value of the formula (B) is −3% or more and 2% or less.

公开(公告)号：US20240417310A1

公开(公告)日：2024-12-19

申请号：US18814160

申请日：2024-08-23

Applicant: AGC Inc.

Inventor： Yuya HAMADA ,  Hirofumi TOKUNAGA

IPC: C03C3/093 ,  C03B5/225 ,  C03B19/02 ,  C03B25/04 ,  C03C3/091 ,  C03C3/095

Abstract: An alkali-free glass, includes, as represented by mol % based on oxides: 50% to 76% of SiO2; 2% to 6% of Al2O3; 18% to 35% of B2O3; 1% to 3.5% of MgO; 0.5% to 4% of CaO; 1% to 4.5% of SrO; and 0% to 3% of BaO, in which an expression (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the expression (A) is 3.5 to 6, an expression (B) is [Al2O3]—([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (B) is −2 to 2, an expression (J) is ([MgO]+[CaO])/([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (J) is 0.2 to 0.7, and Δβ-OH is 0 mm−1 to 0.1 mm−1.

公开(公告)号：US20240199469A1

公开(公告)日：2024-06-20

申请号：US18594084

申请日：2024-03-04

Applicant: AGC Inc.

Inventor： Yuya HAMADA ,  Hirofumi TOKUNAGA

IPC: C03C3/091 ,  C03B18/02 ,  C03C3/087 ,  C03C3/11 ,  C03C3/112 ,  C03C3/118

CPC classification number: C03C3/091 ,  C03B18/02 ,  C03C3/087 ,  C03C3/11 ,  C03C3/112 ,  C03C3/118

Abstract: The present invention relates to an alkali-free glass having a strain point of 700° C. or higher and 740° C. or lower, a density of 2.6 g/cm3 or lower, a Young's modulus of 90 GPa or higher and 100 GPa or lower, an average coefficient of thermal expansion at 50° C. to 350° C. of 30×10−7/K or higher and 39×10−7/K or lower, a temperature T2 at which a glass viscosity reaches 102 dPa·s of 1590° C. or higher and 1690° C. or lower, a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1350° C. or lower, a glass surface devitrification temperature (Tc) of lower than (T4+80)° C., and a specific elastic modulus of 36 MN·m/kg or higher, and including a prescribed glass composition.