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US 2026/0152432 A1Published application
X-ray opaque glass, glass filler, and resin composition
AssigneeNippon Electric Glass Co., Ltd.
InventorsTamio ANDO, Shunsuke FUJITA
Life of this patent
Estimating the term…
Abstract
The purpose of the present invention is to provide a glass that can achieve a desired light transmission property and X-ray opacity when blended with a resin. Thus, provided is an X-ray opaque glass containing, by mass %, from 25 to 75% of SiO2, from 0 to 15% of B2O3, from 5 to 23% of Al2O3, from 0 to 15% of K2O, and from 0 to 30% of Cs2O, and substantially not containing a Pb component. In the X-ray opaque glass, an aluminum equivalent thickness, which is an indicator of X-ray opacity, and a refractive index nd satisfy a relationship of (aluminum equivalent thickness)/(refractive index nd)≥1.6.
Claims15
1:
- An X-ray opaque glass comprising, by mass %, from 25 to 75% of SiO2, from 0 to 15% of B2O3, from 5 to 23% of Al2O3, from 0 to 15% of K2O, and from 0 to 30% of Cs2O, and substantially not comprising a Pb component,
- the X-ray opaque glass having an aluminum equivalent thickness, which is an indicator of X-ray opacity, and a refractive index nd satisfying a relationship of (aluminum equivalent thickness)/(refractive index nd)≥1.6.
2:
- An X-ray opaque glass comprising, by mass %, from 25 to 75% of SiO2, from 0 to 15% of B2O3, from 5 to 23% of Al2O3, from 0 to 15% of K2O, from 0 to 30% of Cs2O, and from 10 to 40% of Cs2O+BaO+SnO2+La2O3, and substantially not comprising a Pb component.
3:
- The X-ray opaque glass according to claim 1, wherein a refractive index nd is from 1.48 to 1.58.
4:
- The X-ray opaque glass according to claim 1, wherein an X-ray opacity is 2.5 mm or more in terms of an aluminum equivalent thickness.
5:
- The X-ray opaque glass according to claim 1, substantially not comprising an F component.
6:
- The X-ray opaque glass according to claim 1, comprising, by mass %, 10% or more of Cs2O+BaO+SnO2+La2O3.
7:
- The X-ray opaque glass according to claim 1, substantially not comprising TiO2.
8:
- The X-ray opaque glass according to claim 1, further comprising, by mass %, from 0 to 6% of WO3.
9:
- A glass filler made of the X-ray opaque glass according to claim 1.
10:
- The glass filler according to claim 9, wherein the glass filler is substantially spherical.
11:
- The glass filler according to claim 10, having an average particle size of from 0.01 to 50 μm.
12:
- The glass filler according to claim 10, wherein a surface of the glass filler is silanized.
13:
- A resin composition comprising the glass filler according to claim 9 and a curable resin.
14:
- The resin composition according to claim 13, comprising, by weight %, from 1 to 90% of the glass filler.
15:
- The resin composition according to claim 13, the resin composition being for dental use.