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

Patent metadata

Field	Value
Publication number	US-10934640-B2
Application number	US-201816493630-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Feb 22, 2018
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

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×F 1/2 /D 1/2 ≤57.3  (1).

First claim

The invention claimed is:

1. A glass cloth composed of a warp obtained by bundling 30 to 44 glass filaments and a weft obtained by bundling 30 to 39 glass filaments having a diameter in a range of 3.0 to 4.0 μm,
wherein a weave density of each of the warp and the weft is in a range of 100 to 125 yarns/25 mm;
the glass cloth has a thickness in a range of 6.5 to 11.0 μm;
a glass yarn coverage C (100×(25000 (μm)×warp yarn width (μm)×warp weave density (yarns/25 mm)+25000 (μm)×weft yarn width (μm)×weft weave density (yarns/25 mm)-warp yarn width (μm)×warp weave density (yarns/25 mm)×weft yarn width (μm)×weft yarn density (yarns/25 mm))/(25000 (μm)×25000 (μm))) is in a range of 85.5 to 99.5%;
the glass yarn coverage C, an average value F of a number of glass filaments constituting the warp and a number of glass filaments constituting the weft, and an average value D of the weave density of the warp and the weave density of the weft satisfy following expression (1); and
a value of (the weft yarn width)/(the diameter of the glass filament constituting the weft×the number of the glass filaments constituting the weft) is in a range of 1.25 to 1.40:
53.0 ≤C×F 1/2 /D 1/2 ≤57.3  (1).

2. The glass cloth according to claim 1 , wherein the glass yarn coverage C; the average value F of the number of the glass filaments constituting the warp and the number of the glass filaments constituting the weft; and the average value D of the weave density of the warp and the weave density of the weft satisfy following expression (2):
53.6 ≤C×F 1/2 /D 1/2 ≤55.9  (2).

3. A prepreg comprising the glass cloth according to claim 1 .

4. A glass fiber reinforced resin molded product comprising the glass cloth according to claim 1 .

Assignees

• Nitto Boseki Co Ltd

Inventors

• Ikejiri Hirotaka
• Awano Masahiro
• Endo Teiji
• Miyagi Hiromitsu

Classifications

• D10B2505/02

  Reinforcing materials; Prepregs · CPC title

• D10B2101/06

  Glass · CPC title

• C08J5/043

  with glass fibres · CPC title

• D03D13/008 Primary

  characterised by weave density or surface weight · CPC title

• H05K2201/029

  Woven fibrous reinforcement or textile · CPC title