Agc Inc.

Eriko Maeda

Kensuke Nagai

Hiroyuki Hijiya

Akio Koike

Kenji Imakita

Yutaka Kuroiwa

Qing Li

Kazuki Kanehara

Osamu Kagaya

Ryuta Sonoda

Suguru Murayama

Tetsuya Nakashima

Takumi Umada

Takato Kajihara

To provide a glass plate for a window material and a window comprising the glass plate, which are less likely to be a barrier to radio transmitting/receiving in use of a radio-utilizing apparatus, and a radio communication apparatus comprising the glass plate. A glass plate having a radio transmittance of at least 20% at a frequency of 100 GHz as calculated as 18 mm thickness, a window comprising the glass plate, and a radio communication apparatus comprising the glass plate.

Glass plate and window

The present invention provides crystallized glass of three-dimensional shape for easily producing chemically strengthened glass of three-dimensional shape that resists damage and has exceptional transparency. This crystallized glass of three-dimensional shape: contains crystals; has light transmittance in terms of a thickness of 0.8 mm of 80% or higher; and contains 45-74% SiO, 1-30% AlO, 1-25% LiO, 0-10% NaO, 0-5% KO, a total of 0-15% of SnOand/or ZrO, and 0-12% PO, these amounts expressing the oxide-based mass percentage.

Crystallized glass of three-dimensional shape, chemically strengthened glass of three-dimensional shape, and method for producing crystallized glass of three-dimensional shape and chemically strengthened glass of three-dimensional shape

The present invention relates to a chemically strengthened glass having a sheet shape, having a compressive stress layer on a glass surface, having a compressive stress value on the glass surface of 800 MPa or more, having a sheet thickness (t) of 100 μm or more, having a depth of the compressive stress layer (DOL) of (t×0.1) μm or more, and satisfying: CS>CS>0, where Dis a depth in a range of 10 μm or more and not more than DOL from the glass surface, at which a compressive stress value is maximum; CSis the compressive stress value at the depth D; Dis a depth in a range of equal to or less than Dfrom the glass surface, at which a compressive stress value is minimum; and CSis the compressive stress value at the depth D.

Chemically strengthened glass and method for producing same

The present invention relates to a glass for chemical strengthening including, in mole percentage on an oxide basis: 60 to 72% of SiO; 9 to 20% of AlO; 1 to 15% of LiO; 0.1 to 5% of YO; 0 to 1.5% of ZrO; and 0 to 1% of TiO, having a total content of one or more kinds of MgO, CaO, SrO, BaO and ZnO of 1 to 10%, having a total content of NaO and KO of 1.5 to 10%, having a total content of BOand POof 0 to 10%, wherein a ratio ([AlO]+[LiO])/([NaO]+[KO]+[MgO]+[CaO]+[SrO]+[BaO]+[ZnO]+[ZrO]+[YO]) is from 0.7 to 3, wherein a ratio [MgO])/([CaO]+[SrO]+[BaO]+[ZnO]) is from 10 to 45, and having a value M expressed by the following expression of 1,100 or more:M=&#x2212;5&#xd7;[SiO]+121&#xd7;[AlO]+50&#xd7;[LiO]&#x2212;35&#xd7;[NaO]+32&#xd7;[KO]+85&#xd7;[MgO]+54&#xd7;[CaO]&#x2212;41&#xd7;[SrO]&#x2212;4&#xd7;[PO]+218&#xd7;[YO]+436&#xd7;[ZrO]&#x2212;1180,

Glass for chemical strengthening

The purpose of the present invention is to provide a chemically strengthened glass having excellent transparency and strength and being scratch resistant. The present invention pertains to a chemically strengthened glass that: has a compressive stress layer on the surface thereof; has a visible light transmittance of at least 70% when the thickness thereof is converted to 0.8 mm; has a surface compressive stress of at least 600 MPa; has a compressive stress depth of at least 80 &#x3bc;m; and contains a &#x3b2;-spodumene.

Chemically strengthened glass and production method therefor

The present invention pertains to a glass for strengthening, that: has an average transmittance of at least 70% when converted to a thickness of 0.8 mm at a wavelength of 380-780 nm; has a haze value of no more than 0.7% when converted to a thickness of 0.8 mm in a C light source; has a Young's modulus of at least 85 GPa; has a fracture toughness value of at least 0.90 MPa&#xb7;m; a thermal conductivity at 20&#xb0; C. of at least 1.3 W/m&#xb7;K; and comprises a lithium aluminosilicate crystallized glass.

Glass for chemical strengthening, chemically strengthened glass, and electronic device case

The present invention relates to a glass for chemical strengthening including, in mole percentage on an oxide basis: 45 to 75% of SiO; 1 to 30% of AlO; 1 to 20% of LiO; 0 to 5% of YO; 0 to 5% of ZrO; and 0 to 1% of TiO, having a total content of one or more kinds of MgO, CaO, SrO, BaO and ZnO of 1 to 20%, having a total content of NaO and KO of 0 to 10%, having a total content of BOand POof 0 to 10%, and having a value M expressed by the following expression of 1,000 or more: M=&#x2212;5&#xd7;[SiO]+121&#xd7;[AlO]+50&#xd7;[LiO]&#x2212;35&#xd7;[NaO]+32&#xd7;[KO]+85&#xd7;[MgO]+54&#xd7;[CaO]&#x2212;41&#xd7;[Sr O]&#x2212;4&#xd7;[PO]+218&#xd7;[YO]+436&#xd7;[ZrO]&#x2212;1180, in which each of [SiO], [AlO], [LiO], [NaO], [KO], [MgO], [CaO], [SrO], [PO], [YO], and [ZrO] designates a content of each component in mole percentage on an oxide basis.

In a soda lime glass, a content of total iron calculated as FeO, expressed in mass % on an oxide basis, is 0.25 to 1%, a mass proportion of divalent iron calculated as FeOin the total iron calculated as FeOis 30 to 50%, a content of total sulfur calculated as SO, expressed in mass % on an oxide basis, is 0.003 to 0.1%, and a content of Se is 3 mass ppm or more. In the soda lime glass, visible light transmittance Tvis 30 to 55% calculated as 6 mm thickness of a glass sheet, solar direct transmittance Te is 20 to 40% calculate as 6 mm thickness of a glass sheet, and excitation purity Pe is 8.0% or less calculated as 6 mm thickness of a glass sheet.

Soda-lime glass

The present invention pertains to a glass for a data storage medium substrate which contains a specific amount of each of SiO, AlO, MgO, CaO, SrO, BaO, LiO, NaO, and KO, in molar percentage based on the oxides, and does not substantially contain BOor ZrO, wherein the sum of the LiO, NaO, and KO contents (RO), the molar ratio of the SiOcontent to the AlOcontent (SiO/AlO), and the molar ratio of the sum of the SiOand AlOcontents (SiO+AlO) to RO[(SiO+AlO)/RO] fall within their specific ranges, formula (1): 90&#x3c;[SiO]+2&#xd7;[AlO]+0.8&#xd7;[RO]&#x2212;0.5&#xd7;[RO] [in formula (1), RO represents the sum of the MgO, CaO, SrO, and BaO contents] is satisfied, and the glass transition point T, the alkali resistance, and the acid resistance fall within their specific ranges.

Glass for data storage medium substrate, glass substrate for data storage medium, and magnetic disk

The present invention aims to provide a heat-ray- and ultraviolet-absorbing glass plate having low solar transmittance and ultraviolet transmittance, having a high visible light transmittance, and containing a small amount of bubbles. The present invention relates to a heat-ray- and ultraviolet-absorbing glass plate that is a soda lime glass having a specific composition, having a mass proportion of divalent iron to the total iron being 50% or more, and having, as a value calculated as 4 mm thickness of the glass plate, a visible light transmittance Tv of 66% or more, a solar transmittance Te of 65% or less, a ratio Tv/Te of Tv and Te of 1.3 or more, and an ultraviolet transmittance Tuv of 50% or less.

Growing community of inventors

Tokyo, Japan

Eriko Maeda