公开(公告)号：US11746447B2

公开(公告)日：2023-09-05

申请号：US17599133

申请日：2020-08-20

申请人： NITTO BOSEKI CO., LTD.

发明人： Hirotaka Ikejiri ,  Masahiro Awano ,  Kimihiro Takatsu

IPC分类号： D03D15/267 ,  C08J5/24 ,  D03D15/46 ,  D03D15/37 ,  D03D15/41

CPC分类号： D03D15/267 ,  C08J5/244 ,  D03D15/37 ,  D03D15/41 ,  D03D15/46 ,  C08J2363/00

摘要： A glass cloth including warp yarns and weft yarns that are glass yarns each formed by bundling 30 to 44 glass filaments each having a circle-equivalent diameter of 3.0 to 4.4 μm, wherein the weaving density of the warp yarns and the weft yarns is 85 to 125 yarns/25 mm, at least either of the warp yarn and the weft yarn is a flat glass yarn formed of flat glass filaments, the weaving density thereof is less than 100 yarns/25 mm, the major axis DL of the flat glass filament is 3.3 to 6.0 μm, the minor axis DS is 2.0 to 3.9 μm, the number of twists T of each of the flat glass yarns is 0.70 twists/25 mm or less, and the number of the flat glass filaments F constituting each of the flat glass yarns, T, DL, and DS satisfy the following expression:




89.0
≤

F
×


(


DL
×

(

1
-

T

1
/
2



)


+

DS
×

T

1
/
2




)

/

(

DL
/
DS

)



≤

129.0
.

公开(公告)号：US11149363B2

公开(公告)日：2021-10-19

申请号：US16320657

申请日：2017-01-06

申请人： NITTO BOSEKI CO., LTD.

发明人： Hirotaka Ikejiri ,  Teiji Endo ,  Masahiro Awano ,  Ryosuke Osada

IPC分类号： D03D15/25 ,  D03D15/513 ,  D03D1/00 ,  D03D13/00 ,  H05K1/03 ,  D03D15/267

摘要： A glass cloth includes warp yarns and weft yarns formed by bundling in the range of 14 to 55 glass filaments having a diameter in the range of 3.0 to 4.2 μm, and has a weaving density of the warp yarns and the weft yarns of 86 to 140 yarns/25 mm, a thickness of 7.5 to 12.0 μm, a mass of 6.0 to 10.0 g per m2, and an average number of stages of 2.00 or more and less than 3.00, an average degree of opening, which is indicated as the geometric mean of the degree of opening of the warp yarns and the degree of opening of the weft yarns, in the range of 1.000 to 1.300, and a yarn width ratio, as the ratio of the yarn width of the warp yarns to that of the weft yarns, in the range of 0.720 to 0.960.

公开(公告)号：US10934640B2

公开(公告)日：2021-03-02

申请号：US16493630

申请日：2018-07-31

申请人： NITTO BOSEKI CO., LTD.

发明人： Hirotaka Ikejiri ,  Masahiro Awano ,  Teiji Endo ,  Hiromitsu Miyagi

IPC分类号： D03D15/267 ,  D03D1/00 ,  H05K1/03

摘要： Provided is a glass cloth enabling to reduce a mass of the glass cloth, being manufactured efficiently, suppressing generation of pinholes in a prepreg including the glass cloth, and maintaining excellent appearance. The glass cloth is composed of warps and wefts obtained by bundling 30 to 44 glass filaments having a diameter in the range of 3.0 to 4.0 μm, the weave densities of the warp and the weft being in the range of 100 to 125 yarns/25 mm; the glass cloth has a thickness in the range of 6.5 to 11.0 μm; the glass yarn coverage C is 85.5 to 99.5%; and the glass yarn coverage C, the average value F of the number of glass filaments constituting the warp and the weft, and the average value D of the weave densities of the warp and the weft satisfy the following expression (1): 53.0≤C×F1/2/D1/2≤57.3  (1).