Search International and National Patent Collections

1. (WO2017168921) GLASS CLOTH

Pub. No.:    WO/2017/168921    International Application No.:    PCT/JP2017/000317
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Sat Jan 07 00:59:59 CET 2017
IPC: D03D 15/12
H05K 1/03
Applicants: NITTO BOSEKI CO., LTD.
Inventors: IKEJIRI, Hirotaka
池尻 広隆
ENDO, Teiji
遠藤 貞二
AWANO, Masahiro
粟野 昌弘
OSADA, Ryosuke
長田 領介
The purpose of the present invention is to provide a glass cloth capable of suppressing occurrences of prepreg pinholes and maintaining quality of appearance in the prepreg even when the average number of stages is less than 3.00. Provided is a glass cloth that is constituted of warp and weft formed from bundles of glass filaments with a diameter in the range of 3.0 - 4.2 µm in a range of 14 - 55 filaments, with the weave density of the warp and weft being in the range of 86 - 140/25 mm, and that has a thickness in the range of 7.5 - 12.0 µm, a mass in the range of 6.0 - 10.0 g per 1 m2, and an average number of stages in a range of 2.00 or greater and less than 3.00, wherein the average degree of opening shown by the geometric mean of the degree of opening of the warp and the degree of opening of the weft is in the range of 1.000 - 1.300, and the filament width ratio shown by the ratio of the fineness of the warp filaments to fineness of the weft filaments is in the range of 0.720 - 0.960.