	US 11,958,952 B2
	Surface-treated glass cloth, prepreg, and printed wiring board
Hiromitsu Miyagi, Fukushima (JP); Kazutaka Adachi, Fukushima (JP); Atsushi Ouchi, Fukushima (JP); and Shohei Iwasawa, Fukushima (JP)
Assigned to Nitto Boseki Co., Ltd., Fukushima (JP)
Appl. No. 17/424,673
Filed by NITTO BOSEKI CO., LTD., Fukushima (JP)
PCT Filed Jul. 2, 2019, PCT No. PCT/JP2019/026372 § 371(c)(1), (2) Date Jul. 21, 2021, PCT Pub. No. WO2020/194772, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-061152 (JP), filed on Mar. 27, 2019.
Prior Publication US 2022/0106453 A1, Apr. 7, 2022
Int. Cl. C08J 5/24 (2006.01); B29B 11/16 (2006.01); C03C 3/091 (2006.01); C03C 13/00 (2006.01); C03C 25/1095 (2018.01); D03D 15/00 (2021.01); D03D 15/267 (2021.01); H05K 1/03 (2006.01)

CPC C08J 5/248 (2021.05) [B29B 11/16 (2013.01); C03C 3/091 (2013.01); C03C 13/00 (2013.01); C03C 25/1095 (2013.01); D03D 15/00 (2013.01); D03D 15/267 (2021.01); H05K 1/0306 (2013.01); H05K 1/038 (2013.01); C03C 2213/00 (2013.01); C08J 2371/12 (2013.01)]

9 Claims

1. A surface-treated glass cloth comprising a surface treatment layer on a surface, wherein:

a glass constituting the glass cloth has a composition containing 52.0 to 60.0 mass % of SiO₂, 15.0 to 26.0 mass % of B₂O₃, 9.0 to 18.0 mass % of Al₂O₃, 1.0 to 8.0 mass % of MgO, 1.0 to 10.0 mass % of CaO, 0 to 6.0 mass % of SrO, 0 to 6.0 mass % of TiO₂, and 0.1 to 3.0 mass % in total of F₂and Cl₂, based on a total amount of the glass;

the glass cloth has a surface coverage in a range of 75.0 to 100.0% and a thickness in a range of 8 to 95 μm; and

the surface treatment layer contains a silane coupling agent having a methacrylic group and contains no surfactant.