US 2022/0089824 A1Published application

Glass cloth, prepreg, and glass fiber-reinforced resin molded product

AssigneeNitto Boseki Co., Ltd.

InventorsHirotaka IKEJIRI, Masahiro AWANO, Kimihiro TAKATSU

Life of this patent

Estimating the term…

Loading patent…

Abstract

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 .

Claims4

Dependent claims

A glass cloth comprising warp yarns and weft yarns that are glass yarns each formed by bundling glass filaments in a range of 30 to 44 filaments each having a circle-equivalent diameter in a range of 3.0 to 4.4 μm, wherein

a weaving density of the warp yarns and a weaving density of the weft yarns are each in a range of 85 to 125 yarns/25 mm,
at least either of the warp yarn and the weft yarn is a flat glass yarn composed of flat glass filaments each having a flat cross-sectional shape,
a weaving density thereof is less than 100 yarns/25 mm
a major axis DL of the flat cross section of each of the flat glass filaments is in a range of 3.3 to 6.0 μm, a minor axis DS of the flat cross section of each of the flat glass filaments is in a range of 2.0 to 3.9 μm,
the major axis DL is a higher value than the minor axis DS,
a number of twists T of each of the flat glass yarns is equivalent to or less than 0.70 twists/25 mm, and
a number of the flat glass filaments F constituting each of the flat glass yarns, the number of twists T, the major axis DL, and the minor axis DS satisfy the following expression (1):
89.0
≤
F
×
(
DL
×
(
1
-
T
1
/
2
)
+
DS
×
T
1
/
2
)
/
(
DL
/
DS
)
≤
129.0
.
(
1
)

39 more elements

Dependencies are inferred from the claim text.