LOW DIELECTRIC GLASS FIBER
A glass fiber having a low dielectric constant and low dielectric loss tangent consists essentially of by weight, as a glass composition, 52 to 60% of SiO 2 , 11 to 16% of Al 2 O 3 , 20 to 30% of B 2 O 3 , and 4 to 8% of CaO, and substantially no MgO, substantially no Li 2 O, substantially no Na 2 O, substantially no K 2 O, and substantially no Ti 2 O. The glass fiber also may contain up to 2% F 2 by weight. The glass fiber is ideal for use as reinforcement for printed wiring boards, and has excellent dielectric properties at frequencies of about 18 GHz or higher.
1 . A low-dielectric-constant glass fiber consisting essentially of 52 to 60% of SiO 2 , 11 to 16% of Al 2 O 3 , 20 to 30% of B 2 O 3 , and 4 to 8% of CaO, by weight, as a glass composition.
2 . The low-dielectric-constant glass fiber of claim 1 , wherein the glass fiber consists essentially of 53 to 58% of SiO 2 , 11 to 15% of Al 2 O 3 , 22 to 27% of B 2 O 3 , and 5 to 8% of CaO by weight, as a glass composition.
3 . The low-dielectric-constant glass fiber of claim 1 , wherein the glass fiber consists essentially of 54 to 58% of SiO 2 , 11 to 14% of Al 2 O 3 , 24 to 27% of B 2 O 3 , and 5 to 6% of CaO by weight, as a glass composition.
4 . The low-dielectric-constant glass fiber of claim 1 , wherein the glass fiber further contains up to about 2% F 2 by weight.
5 . The low-dielectric-constant glass fiber of claim 2 , wherein the glass fiber further contains up to about 2% F 2 by weight.
6 . The low-dielectric-constant glass fiber of claim 3 , wherein the glass fiber further contains up to about 2% F 2 by weight.
7 . The low-dielectric-constant glass fiber of claim 1 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 5×10 −4 at a frequency of 1 MHz at room temperature.
8 . The low-dielectric-constant glass fiber of claim 2 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 5×10 −4 at a frequency of 1 MHz at room temperature.
9 . The low-dielectric-constant glass fiber of claim 3 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 5×10 −4 at a frequency of 1 MHz at room temperature.
10 . The low-dielectric-constant glass fiber of claim 1 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 32×10 −4 at a frequency of 10 GHz at room temperature.
11 . The low-dielectric-constant glass fiber of claim 2 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 32×10 −4 at a frequency of 10 GHz at room temperature.
12 . The low-dielectric-constant glass fiber of claim 3 wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 32×10 −4 at a frequency of 10 GHz at room temperature.
13 . The low-dielectric-constant glass fiber of claim 1 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 30×10 −4 at a frequency of 18 GHz at room temperature.
14 . The low-dielectric-constant glass fiber of claim 2 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 30×10 −4 at a frequency of 18 GHz at room temperature.
15 . The low-dielectric-constant glass fiber of claim 3 wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 30×10 −4 at a frequency of 18 GHz at room temperature.
16 . A product comprising a glass fiber according to claim 1 , the product being selected from the group consisting of a printed circuit board, a woven fabric, a non-woven fabric, a unidirectional fabric, a chopped strand, a chopped strand mat, a composite material, and a communication signal transport medium.
17 . A product comprising a glass fiber according to claim 2 , the product being selected from the group consisting of a printed circuit board, a woven fabric, a non-woven fabric, a unidirectional fabric, a chopped strand, a chopped strand mat, a composite material, and a communication signal transport medium.
18 . A product comprising a glass fiber according to claim 3 , the product being selected from the group consisting of a printed circuit board, a woven fabric, a non-woven fabric, a unidirectional fabric, a chopped strand, a chopped strand mat, a composite material, and a communication signal transport medium.
19 . A low-dielectric-constant glass fiber comprising 52 to 60% of SiO 2 , 11 to 16% of Al 2 O 3 , 20 to 30% of B 2 O 3 , and 4 to 8% of CaO, by weight, as a glass composition, and comprising substantially no MgO, substantially no Li 2 O, substantially no Na 2 O, substantially no K 2 O, and substantially no TiO 2 .
20 . The low-dielectric-constant glass fiber of claim 19 , wherein the glass fiber comprises 53 to 58% of SiO 2 , 11 to 15% of Al 2 O 3 , 22 to 27% of B 2 O 3 , and 5 to 8% of CaO by weight, as a glass composition, and comprises substantially no MgO, substantially no Li 2 O, substantially no Na 2 O, substantially no K 2 O, and substantially no TiO 2 ,
21 . The low-dielectric-constant glass fiber of claim 19 , wherein the glass fiber comprises 54 to 58% of SiO 2 , 11 to 14% of Al 2 O 3 , 24 to 27% of B 2 O 3 , and 5 to 6% of CaO by weight, as a glass composition, and comprises substantially no MgO, substantially no Li 2 O, substantially no Na 2 O, substantially no K 2 O, and substantially no TiO 2 .
22 . The low-dielectric-constant glass fiber of claim 19 , wherein the glass fiber further contains up to about 2% F 2 by weight.
23 . The low-dielectric-constant glass fiber of claim 20 , wherein the glass fiber further contains up to about 2% F 2 by weight.
24 . The low-dielectric-constant glass fiber of claim 21 , wherein the glass fiber further 5 contains up to about 2% F 2 by weight.
25 . The low-dielectric-constant glass fiber of claim 19 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 5×10 −4 at a frequency of 1 MHz at room temperature.
26 . The low-dielectric-constant glass fiber of claim 20 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 5×10−4 at a frequency of 1 MHz at room temperature.
27 . The low-dielectric-constant glass fiber of claim 21 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 5×10 −4 at a frequency of 1 MHz at room temperature.
28 . The low-dielectric-constant glass fiber of claim 19 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 32×10 −4 at a frequency of 10 GHz at room temperature.
29 . The low-dielectric-constant glass fiber of claim 20 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 32×10 −4 at a frequency of 10 GHz at room temperature.
30 . The low-dielectric-constant glass fiber of claim 21 wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 32×10 −4 at a frequency of 10 GHz at room temperature.
31 . The low-dielectric-constant glass fiber of claim 19 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 30×10 −4 at a frequency of 18 GHz at room temperature.
32 . The low-dielectric-constant glass fiber of claim 20 , wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 30×10 −4 at a frequency of 18 GHz at room temperature.
33 . The low-dielectric-constant glass fiber of claim 21 wherein the glass fiber has a dielectric constant less than or equal to about 5, and a dielectric loss tangent less than or equal to about 30×10 −4 at a frequency of 18 GHz at room temperature.
34 . A product comprising a glass fiber according to claim 19 , the product being selected from the group consisting of a printed circuit board, a woven fabric, a non-woven fabric, a unidirectional fabric, a chopped strand, a chopped strand mat, a composite material, and a communication signal transport medium.
35 . A product comprising a glass fiber according to claim 20 , the product being selected from the group consisting of a printed circuit board, a woven fabric, a non-woven fabric, a unidirectional fabric, a chopped strand, a chopped strand mat, a composite material, and a communication signal transport medium.
36 . A product comprising a glass fiber according to claim 21 , the product being selected from the group consisting of a printed circuit board, a woven fabric, a non-woven fabric, a unidirectional fabric, a chopped strand, a chopped strand mat, a composite material, and a communication signal transport medium.