Glass fiber and method for producing the same

Patent metadata

Field	Value
Publication number	US-12043566-B2
Application number	US-201817045884-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Apr 9, 2018
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A glass fiber according to the present invention is suitable for preventing filament breakage and suitable for being stably produced for a long term, and has a ß-OH value of 0.02 mm −1 or more and less than 0.55 mm −1 . The preferred content of SO 3 is more than 0 ppm and 70 ppm or less on a mass basis. The glass fiber is preferably substantially free of As and Sb. SO 3 can be supplied to a glass raw material as, for example, a sulfuric acid salt of an alkali metal or an alkaline-earth metal.

First claim

The invention claimed is:

1. A glass fiber having a β-OH value of 0.02 mm −1 or more and less than 0.55 mm −1 , comprising, in mass %:

SiO 2
45 to 80%;

Al 2 O 3
0 to 40%;

B 2 O 3
0 to 30%;

MgO
0 to 30%;

CaO
0 to 30%;

SrO
0 to 30%;

Li 2 O
0 to 4.5%;

Na 2 O
0 to 5%; and

K 2 O
0 to 5%.

wherein, in mass %, the content of SiO 2 is 45 to 73% and/or the content of Al 2 O 3 is 10 to 40%.

2. The glass fiber according to claim 1 , wherein, in mass %, the content of SiO 2 is 50 to 73%.

3. The glass fiber according to claim 1 , wherein, in mass %, the content of SiO 2 is 45 to 70%, the content of Al 2 O 3 is 15 to 40%, and the total content in mass % of MgO, CaO, and SrO is 0 to 30%.

4. The glass fiber according to claim 3 , wherein, in mass %, the content of SiO 2 is 50 to 70%.

5. The glass fiber according to claim 4 , wherein, in mass %, the content of SiO 2 is 52 to 66%, the content of Al 2 O 3 is 12 to 26%, the content of B 2 O 3 is 0 to 4%, the content of MgO is 5 to 19%, the content of CaO is 0 to 16%, and the content of Na 2 O is 0 to 2%.

6. The glass fiber according to claim 5 , wherein, in mass %, the content of SiO 2 is 55 to 60%, the content of MgO is 5 to 16%, and the total content in mass % of Li 2 O, Na 2 O, and K 2 O is 0 to 2%.

7. The glass fiber according to claim 5 , wherein, in mass %, the content of Al 2 O 3 is 19 to 26%, the content of B 2 O 3 is 0 to 2%, the content of MgO is 9 to 19%, the content of CaO is 0 to 10%, the content of Li 2 O is 0 to 0.5%, the content of Na 2 O is 0 to 1.5%, and the content of K 2 O is 0 to 0.5%.

8. The glass fiber according to claim 1 , wherein, in mass %, the content of SiO 2 is 45 to 73%, the content of Al 2 O 3 is 0 to 18%, the content of B 2 O 3 is 14 to 30%, the content of MgO is 0 to 6%, the content of CaO is 0 to 8%, the content of Na 2 O is 0 to 5%, and the content of K 2 O is 0 to 1.5%.

9. The glass fiber according to claim 8 , wherein, in mass %, the content of SiO 2 is 50 to 73%.

10. The glass fiber according to claim 1 , wherein the glass fiber is substantially free of a divalent metal oxide other than MgO and CaO.

11. The glass fiber according to claim 1 , wherein the glass fiber has a diameter of 15 μm or less.

12. The glass fiber according to claim 11 , wherein
the glass fiber is substantially free of As and Sb, and
the content of SO 3 is more than 0 ppm and 75 ppm or less on a mass basis.

13. The glass fiber according to claim 12 , wherein
the glass fiber has a β-OH value of 0.3 mm −1 or more and less than 0.55 mm −1 , and
the content of SO 3 is 20 to 75 ppm on a mass basis.

14. The glass fiber according to claim 1 , wherein
the glass fiber has a diameter of 10 μm or less.

15. The glass fiber according to claim 1 , wherein a variation in diameter is 3 μm or less.

16. The glass fiber according to claim 1 , being a long glass fiber.

17. A rubber-reinforcing cord comprising a strand composed of a bundle of a plurality of the long glass fibers according to claim 16 .

18. A rubber product reinforced with the rubber-reinforcing cord according to claim 17 .

19. The glass fiber according to claim 1 , being a short glass fiber.

20. A non-woven glass fiber fabric comprising the short glass fiber according to claim 19 .

21. A method for producing the glass fiber according to claim 1 , comprising:
making a glass melt from a glass raw material comprising a sulfuric acid salt; and
forming a glass fiber from the glass melt, wherein
the sulfuric acid salt comprises a sulfuric acid salt of an alkali metal or an alkaline-earth metal.

22. A glass fiber having a β-OH value of 0.02 mm −1 or more and less than 0.55 mm −1 , wherein
the glass fiber is substantially free of As and Sb, and
the content of SO 3 is more than 0 ppm and 75 ppm or less on a mass basis.

23. The glass fiber according to claim 22 , wherein
the glass fiber has a β-OH value of 0.3 mm 1 or more and less than 0.55 mm −1 , and
the content of SO 3 is 20 to 75 ppm on a mass basis.

24. A rubber-reinforcing cord comprising a strand composed of a bundle of a plurality of the glass fibers according to claim 22 .

25. A rubber product reinforced with the rubber-reinforcing cord according to claim 24 .

26. A non-woven glass fiber fabric comprising the glass fiber according to claim 22 .

27. A glass fiber having a β-OH value of 0.35 mm −1 to 0.53 mm −1 , wherein
the content of SO 3 is 20 ppm to 70 ppm on a mass basis.

28. A rubber-reinforcing cord comprising a strand composed of a bundle of a plurality of the glass fibers according to claim 27 .

29. A rubber product reinforced with the rubber-reinforcing cord according to claim 28 .

30. A non-woven glass fiber fabric comprising the glass fiber according to claim 27 .

Assignees

• Nippon Sheet Glass Co Ltd

Inventors

• Nakamura Aya
• Fukuchi Hidetoshi
• Shojiya Masanori

Classifications

• C03C2213/00

  Glass fibres or filaments · CPC title

• C03B37/011

  starting from a liquid phase reaction process, e.g. through a gel phase · CPC title

• C03B37/095

  Use of materials therefor · CPC title

• C03B2201/04

  Hydroxyl ion (OH) · CPC title

• C03C3/095

  containing rare earths · CPC title