The present invention relates to a glass including, in terms of mole percentage based on oxides: 52% to 70% of SiO.sub.2; 14% to 25% of Al.sub.2O.sub.3; 10% to 18% of Li.sub.2O; 1% to 7% of Na.sub.2O; 0.1% to 5% of K.sub.2O; 0% to 10% of B.sub.2O.sub.3; 0% to 5% of P.sub.2O.sub.5; 0% to 5% of MgO; 0% to 5% of ZnO; 0% to 2% of ZrO.sub.2; and 0% to 5% of Y.sub.2O.sub.3, in which a parameter M is 20 or less, the parameter M being determined by the following formula, M=−1.15×[SiO.sub.2]−1.73×[Al.sub.2O.sub.3]+0.155×[Li.sub.2O]+0.74×[Na.sub.2O]−4.75×[K.sub.2O]−2.1×[B.sub.2O.sub.3]−2.17×[P.sub.2O.sub.5]+3.25×[MgO]−2.0×[ZnO]−13.3×[ZrO.sub.2]−0.80×[Y.sub.2O.sub.3]+120.

A coated glass article includes a glass article comprising a glass having a surface. The surface has an adhesion promoting region comprising a nanostructure formed at the surface of the glass. The adhesion promoting region is constructed of materials that are the same as one or more constituents of a glass composition of the glass. The coated glass article further includes a coating disposed on the adhesion promoting region formed at the surface of the glass. The coating incudes one or more polymer coating materials. The adhesion promoting region improves adhesion of the coating to the glass while also eliminating the use of titania or other adhesion promoting compounds that can adversely affect the optical properties of the coatings.

An ultrathin chemically toughened glass article has a thickness of no more than 0.4 mm. In order to improve the sharp impact resistance, the glass article has a breakage height (given in mm) of more than 50 multiplied by the thickness (t) of the glass article (given in mm). Further, it has a breakage bending radius (given in mm) of less than 100000 multiplied by the thickness (t) of the glass article (given in mm) and divided by the figure of the surface compressive stress (in MPa) measured at the first surface.

The purpose of the present invention is to provide a chemically strengthened glass in which reduction in glass surface strength is effectively suppressed even without performing a polishing treatment after a prolonged chemical strengthening treatment has been conducted at a high temperature. The present invention relates to a chemically strengthened glass having a specific glass composition, wherein: the surface roughness (Ra) is a specific value or greater; the compressive stress layer depth of a surface layer is a specific value or greater; by setting the hydrogen concentration in the glass surface layer to be within a specific range, the surface strength of the glass is dramatically improved even without performing an etching treatment using hydrofluoric acid or polishing the glass surface after a prolonged chemical strengthening treatment has been conducted at a high temperature.

A toughenable glass article includes a glass and has a thickness of less than 100 μm and a cooling state which is such that, after chemical toughening to a depth of 30% of the thickness, the glass article has a relative thermal length change potential in a range from −1500 ppm to ≤0 ppm.

The present invention discloses a glass material, and a preparation method and a product thereof. The glass material contains a lithium salt crystalline phase and a phosphate crystalline phase. For the entire material, the crystallinity is 40-95%, the lithium salt crystalline phase accounts for 40-90 wt % of the entire material, and the phosphate crystalline phase accounts for 2-15 wt % of the entire material, wherein the lithium salt crystalline phase is one or more of lithium silicate, lithium disilicate and petalite, and the phosphate crystalline phase is aluminum phosphate or/and aluminum metaphosphate. After the glass material of the present invention is toughened, the Vickers hardness (Hv) is 900 kgf/mm.sup.2 or above. The glass material or a substrate of the present invention is suitable for protective members such as mobile terminal equipment and optical equipment and has high hardness and strength. Furthermore, the present invention may also be used for other decorations such as outer frame members of portable electronic equipment.

A glass article includes lithium alumino-silicate (“LAS”), a first surface, a second surface opposed to the first surface, a first compressive region extended from the first surface to a first compression depth, a second compressive region extended from the second surface to a second compression depth, and a tensile region disposed between the first compression depth and the second compression depth, wherein a stress profile in the first compressive region comprises a first segment provided between the first surface and a first transition point and a second segment provided between the first transition point and the first compression depth, and wherein a ratio of a stress at the first transition point to a stress at the first surface ranges from 0.22 to 0.47.

Embodiments disclosed therein generally pertain to selectively strengthening glass. More particularly, techniques are described for selectively strengthening cover glass, which tends to be thin, for electronic devices, namely, portable electronic devices.

Disclosed herein are laminated glass articles having a hard scratch resistant outer surface. In some embodiments, the laminated glass article includes a glass core layer and a glass clad layer. In some embodiments, the laminated glass article includes a glass core layer sandwiched between two glass clad layers. In some embodiments, the clad glass is selected from the group of consisting of: aluminate glasses; oxynitride glasses; rare earth/transition metal glasses; beryl glasses; and glasses containing lithium, zirconium, or both lithium and zirconium. Such glass compositions can thus be used in forming the clad layer.

A method of manufacturing a cell unit substrate, includes: a modified zone-formation step in which modified zones are formed along a predetermined cutting line on the mother substrate to be spaced apart from each other by a first distance by irradiating the mother substrate with laser beams having an energy intensity within an ablation threshold of the mother substrate along the cutting line, a modified zone-etching step in which through-holes are formed along the cutting line on the mother substrate to be spaced apart from each other by the first distance by etching the modified zones, a surface strengthening step in which the mother substrate having the through-holes therein is subjected to surface strengthening, with the mother substrate dipped in a strengthening solution, and a substrate separation step in which the cell unit substrates are separated from the surface-strengthened mother substrate.