Nippon Sheet Glass has been granted a patent for a novel glass composition that has a low permittivity and is suitable for mass production. The glass composition includes SiO2, B2O3, Al2O3, R2O, and RO at specific weight percentages. The composition satisfies certain conditions, such as SiO2+B2O3=80 and SiO2+B2O3+Al2O3=99.9, and has a permittivity of 4.65 or less at a frequency of 1 GHz. The glass also has a viscosity of 103 dPa·s or less at a temperature of 1300°C or lower. GlobalData’s report on Nippon Sheet Glass gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Nippon Sheet Glass, Vacuum insulated glazing was a key innovation area identified from patents. Nippon Sheet Glass's grant share as of September 2023 was 32%. Grant share is based on the ratio of number of grants to total number of patents.
A recently granted patent (Publication Number: US11773009B2) discloses a glass composition that has various applications in the field of glass fibers, glass cloths, prepregs, and printed boards. The glass composition comprises specific weight percentages of different oxides, including SiO2, B2O3, Al2O3, R2O, RO, T-Fe2O3, TiO2, and ZnO. The composition also satisfies certain conditions related to permittivity, viscosity, and temperature.
Claim 1 describes the glass composition, which includes specific weight percentages of SiO2, B2O3, Al2O3, R2O, RO, T-Fe2O3, TiO2, and ZnO. The composition must also satisfy certain conditions, such as the ratio of MgO to the sum of MgO and CaO being between 0.1 and 0.5, a permittivity at 1 GHz of 4.65 or less, and a viscosity of 103 dPa·s at a temperature (T3) of 1300°C or less.
Claim 2 states that the glass composition should have a viscosity of 102 dPa·s at a temperature (T2) of 1650°C or less.
Claim 3 specifies that the glass composition should have a viscosity of 103 dPa·s at a temperature (T3) higher than a devitrification temperature TL.
Claims 4 to 8 describe alternative glass compositions with different weight percentages of SiO2, B2O3, Al2O3, R2O, RO, TiO2, and ZnO. These compositions also have specific conditions related to the sum of SiO2 and B2O3, the sum of SiO2, B2O3, and Al2O3, and the weight percentage of MgO compared to R2O.
Claims 9 to 14 mention glass fibers and glass cloths made from the glass compositions described in claims 1, 4, and 8.
Claims 15 and 16 describe prepregs made from the glass cloths mentioned in claims 12 and 13.
Claims 17 and 18 mention printed boards made from the glass cloths mentioned in claims 12 and 13.
Claim 19 discloses a method for producing a glass fiber by melting the glass composition described in claim 1 at a temperature of 1400°C or more, resulting in a glass fiber with an average diameter of 1 to 6 µm.
Claims 20 and 21 specify additional weight percentage conditions for MgO compared to the sum of MgO and CaO for the glass compositions described in claims 1 and 4.
Claim 22 describes a specific range of weight percentages for SiO2, B2O3, and Al2O3 in the glass composition described in claim 1, along with conditions for the ratio of MgO to RO and the weight percentage of RO.
Overall, this granted patent presents a range of glass compositions with specific weight percentages and conditions that can be used in various applications, including glass fibers, glass cloths, prepregs, and printed boards. The compositions offer desirable properties such as low permittivity, controlled viscosity, and specific temperature ranges.
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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.
GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
