	US 12,459,856 B2
	Glass composition for glass fiber, glass fiber, glass fiber woven fabric, and glass fiber reinforced resin composition
Jun Ito, Koriyama (JP); Tadashi Kurita, Koriyama (JP); Koichi Nakamura, Koriyama (JP); Takashi Nonaka, Koriyama (JP); Norio Hirayama, Narashino (JP); and Hidero Unuma, Yonezawa (JP)
Assigned to Nitto Boseki Co., Ltd., Fukushima (JP)
Appl. No. 19/103,291
Filed by NITTO BOSEKI CO., LTD., Fukushima (JP)
PCT Filed Jun. 5, 2024, PCT No. PCT/JP2024/020508 § 371(c)(1), (2) Date Feb. 12, 2025, PCT Pub. No. WO2025/047032, PCT Pub. Date Mar. 6, 2025.
Claims priority of application No. 2023-141466 (JP), filed on Aug. 31, 2023.
Prior Publication US 2025/0263329 A1, Aug. 21, 2025
Int. Cl. C03C 13/00 (2006.01); C03C 3/064 (2006.01); C03C 3/091 (2006.01); C08J 5/04 (2006.01); D03D 15/267 (2021.01)

CPC C03C 13/00 (2013.01) [C03C 3/064 (2013.01); C03C 3/091 (2013.01); C08J 5/043 (2013.01); D03D 15/267 (2021.01)]

8 Claims

1. A glass composition for glass fiber, comprising:

SiO₂in a range of 35.00 to 50.00% by mass;

Al₂O₃in a range of 12.00 to 28.00% by mass;

B₂O₃in a range of 10.00 to 25.00% by mass;

MgO in a range of 2.00 to 18.00% by mass; and

CaO in a range of 5.00 to 25.00% by mass,

with respect to a total amount, wherein

a total content of MgO and CaO is in a range of 17.09 to 30.00% by mass, and

a ratio of a content of MgO to a content of CaO (MgO/CaO) is in a range of 0.29 to 1.92,

the content S of SiO₂, the content A of Al₂O₃, the content B of B₂O₃, the content M of MgO, and the content C of CaO, satisfy the following formula (1),

21.8≤S×(C+M)/(A+B)≤34.0 (1).