Abstract: An optical glass having a high light transmittance, a high refractive index and excellent production stability, which contains at least one of CaO and SrO together with SiO2, B2O3, La2O3, Nb2O5, TiO2 and BaO, having a composition that substantially contains, by weight %, 1 to 18% of SiO2, 3 to 24% of B2O3, provided that the ratio of content of B2O3 to the content of SiO2 (B2O3/SiO2) is over 1, 10 to 50% of La2O3, 1 to 30% of Nb2O5, 1 to 30% of TiO2, over 6% but not more than 25% of BaO, less than 7% of CaO, 6% or less of SrO, 0 to 13% of MgO, provided that the total content of BaO, CaO, SrO and MgO is 40% or less, 0 to 15% of ZnO, 0 to 15% of ZrO2, 0 to 10% of Al2O3, 0 to 20% of Gd2O3, 0% or more but less than 2% of Y2O3, 0 to 5% of Yb2O3, 0 to 18% of Ta2O5, 0 to 20% of Bi2O3, 0 to 10% of GeO2, 0% or more but less than 2% of Sb2O3, and 0% or more but less than 2% of SnO2, and having a refractive index (nd) of over 1.8, Abbe's number (?d) of 28 to 40 and a density of 4.2 g/cm3 or more.

Abstract: The present invention has an object to provide an optical glass having excellent devitrification properties during high temperature forming and press moldability and capable of reducing weight and size of an optical system. The present invention relates to an optical glass comprising, in mass % on oxide basis; B2O3: 10 to 25%, SiO2: 0.5 to 12%, La2O3: 17 to 38%, Gd2O3: 5 to 25%, ZnO: 8 to 20%, Li2O: 0.5 to 3%, Ta2O5: 5 to 15% and WO3: 3 to 15, wherein (SiO2+B2O3)/(ZnO+Li2O) value which is a mass ratio of the total content of SiO2 and B2O3 to the total content of ZnO and Li2O is from 1.35 to 1.90.

Abstract: A hermetically sealed microelectromechanical system (MEMS) package for an implantable medical device is presented. The MEMS comprises a first substrate that includes an aperture. A feedthrough assembly is coupled to the aperture; the feedthrough assembly comprises a conductive element housed in a glass insulating member. A second substrate is coupled to the first substrate.

Abstract: The present invention has an object to provide an optical glass which has middle refractive index and low dispersibility, a low yield point (Ts) and a liquidus temperature (L.T.) and excellent weather resistance, and is suitable for mold press molding. The present invention relates to an optical glass comprising, in mass % on oxide basis, SiO2: 20 to 40%, B2O3: 10 to 30%, SrO: 10 to 30%, Al2O3: 5.5 to 15%, La2O3: 0.5 to 11%, Li2O: 3 to 12%, CaO: 0 to 10%, BaO: 0 to 9.5%, and ZnO: 0 to 10%.

Abstract: Pressable glass-ceramic compositions for dental purposes of the composition I, II or III I II III (percent by weight) (percent by weight) (percent by weight) ZrO2 17-70%? ZrO2/ 15-70%? Al2O3 15-70% Al2O3 SiO2 17-59%? SiO2 17-59%? SiO2 17-59% Al2O3 ?2-15% ZrO2 32-15%? ZrO2 2-15% Y2O3 ??0-6% Y2O3 ??0-6% Y2O3 0-6% K2O 3-12.5%? K2O 3-12.5%? K2O 3-12.5% Na2O 0.2-8.5%?? Na2O 0.2-8.5%?? Na2O 0.2-8.5% Li2O 0-1.5% Li2O 0-1.5% Li2O 0-1.5% CaO 0.3-2% CaO 0.3-2% CaO 0.3-2% B2O3 0.1-5% B2O3 0.1-5% B2O3 0.1-5% F 0-2.5% F 0-2.5% F 0-2.5% CeO2 0.2-2% CeO2 0.2-2% CeO2 0.2-2% TiO2 0-1.5% TiO2 0-1.5% TiO2 0-1.5% are particularly suitable for the manufacturing of ceramic veneer frames.

Abstract: The present invention provides an optical glass including, by mass %: 46 to 70 of B2O3; 3 to 10 of Li2O; 5 to 15 of Y2O3; 0 to 46 of SiO2: 0 to 20 of Al2O3: 0 to 40 of MgO+CaO+SrO+BaO; 0 to 30 of La2O3; and 0 to 10 of ZrO2+TiO2+Gd2O3.

Abstract: Provided is an optical glass for precision press-molding is free from degradations in product quality caused by a surface altered layer such as fogging, browning, etc., and a precision press-molding preform and an optical element provided are formed of the above glass. The optical glass is a glass which contains B2O3, La2O3 and ZnO and is used as a glass material for precision press-molding, and contains, by mol %, 20 to 60% of B2O3, 0 to 20% of SiO2, 22 to 42% of ZnO, 5 to 24% of La2O3, 0 to 20% of Gd2O3, provided that the total content of La2O3 and Gd2O3 is 10 to 24%, 0 to 10% of ZrO2, 0 to 10% of Ta2O5, 0 to 10% of WO3, 0 to 10% of Nb2O5, 0 to 10% of TiO2, 0 to 10% of Bi2O3, 0 to 10% of GeO2, 0 to 10% of Ga2O3, 0 to 10% of Al2O3, 0 to 10% of BaO, 0 to 10% of Y2O3 and 0 to 10% of Yb2O3, has an Abbe's number (?d) of 40 or more and is substantially free of lithium.

Abstract: An optical glass consisting essentially of B2O3 in an amount of 10-40 wt %, SiO2 in an amount less than or equal to 5 wt %, ZnO in an amount less than or equal to 15 wt %, SrO in an amount less than or equal to 9 wt %, ZrO2 in an amount less than or equal to 9 wt %, La2O3 in an amount of 15 to 45 wt %, BaF2 in an amount of 1 to 10 wt %, BaO in an amount less than or equal to 5 wt %, HfO2 in an amount of 0.1 to 7.5 wt %, Gd2O3 in an amount less than or equal to 16 wt %, CaO in an amount less than or equal to 7 wt %, ZrF4 in an amount less than or equal to 5 wt %, Na2O in an amount less than or equal to 2 wt % and Y2O3 in an amount less than or equal to 16 wt %. The optical glass has a glass transition temperature in a range of 500-670° C. and a refractive index (nd) in a range of 1.60 to 2.00.

Abstract: An optical glass having optical constants of a refractive index (nd) of 1.78 or over, an Abbe number (v d) of 30 or below, and a partial dispersion ratio (? g, F) of 0.620 or below comprises SiO2 and Nb2O5 as essential components, wherein an amount of Nb2O5 in mass % is more than 40%. The optical glass further comprising, in mass % on oxide basis, less than 2% of K2O and one or more oxides selected from the group consisting of B2O3, TiO2, ZrO2, WO3, ZnO, SrO, Li2O and Na2O wherein a total amount of SiO2, B2O3, TiO2, ZrO2, Nb2O5, WO3, ZnO, SrO, Li2O and Na2O is more than 90% and TiO2/(ZrO2+Nb2O5) is less than 0.32.

Abstract: Provided is an optical glass having optical constants, a refractive index (nd) of more than 1.9 and an Abbe number (?d) of not more than 38, having a small partial dispersion ratio and capable of being produced from inexpensive materials. The optical glass has a partial dispersion ratio (?g, F) of at most 0.615, and contains, as indispensable ingredients, B203, La2O3, TiO2, Nb2O5 and Ta2O5, wherein the ratio, as % by mass, of TiO2/Nb2O5 is at most 0.26 and GeO2/Nb2O5 is at most 0.38. The optical glass contains, in terms of % by mass, the following ingredients: B2O3 ??5 to 22%, La2O3 ??15 to 50%, TiO2 0.01 to 15%, Nb2O5 ??5 to 40%, and Ta2O5 ?0.1 to 25%, and SiO2 0 to 10% and/or GeO2 0 to 10% and/or Al2O3 0 to 10% and/or Gd2O3 0 to 16% and/or ZrO2 0 to 15% and/or WO3 0 to 22% and/or Sb2O3 0 to 1%.

Abstract: The invention relates to a method for the production of glass-coated electric components, wherein the components are, inter alia, passivated by the application of the glass. The lead-free glass used is not affected through purification and processing steps and the electric component is protected from mechanical damaging and other detrimental influences, such as impurities. Further, the method remarkably helps to stabilize the electrical properties of the components. Inter alia, a sufficient acid resistance is achieved and it results in an improvement of the expansion adjustment of the glass.

Abstract: Al2O3-rare earth oxide-ZrO2/HfO2 ceramics (including glasses, crystalline ceramics, and glass-ceramics) and methods of making the same. Ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. The particles and fibers are useful, for example, as thermal insulation, filler, or reinforcing material in composites (e.g., ceramic, metal, or polymeric matrix composites). The thin coatings can be useful, for example, as protective coatings in applications involving wear, as well as for thermal management. Certain ceramic particles according to the present invention can be are particularly useful as abrasive particles.

Abstract: Abrasive particles comprising ceramic (including glasses, crystalline ceramics, and glass-ceramics) comprising (on a theoretical oxide basis) Al2O3 and at least one other metal oxide (e.g., REO and; REO and at least one of ZrO2 or HfO2) and methods of making the same. The abrasive particles can be incorporated into a variety of abrasive articles, including bonded abrasives, coated abrasives, nonwoven abrasives, and abrasive brushes.

Abstract: An optical glass has a low glass transition temperature (Tg) and optical constants in which a refractive index (nd) is in the range of from 1.70 to less than 1.74 and an Abbe number (?d) is between 40 and 45 (excluding 40 and 45), has a content of SiO2 is 17% by mass or less, a glass transition temperature (Tg) is 540° C. or less, and a weathering resistance (surface-method) in Class 1 or 2, and has excellent chemical durability, particularly weathering resistance (surface-method) and is appropriate for precision mold press forming.

Abstract: A high-refractivity high-dispersion optical glass for producing an optical element, which requires no machining, such as polishing or lapping, of an optical-function surface after precision press molding, containing B2O3, SiO2, La2O3, Gd2O3, ZnO, Li2O, ZrO2 and Ta2O5 as essential components, containing 0 to 1 mol % of Sb2O3 as an optional component, substantially containing none of PbO and Lu2O3, having a glass transition temperature of 630° C. or lower, and (1) having a refractive index nd and an Abbe's number ?d which satisfy all of the following relational expressions, 1.80<nd?1.90, 35<?d?50, and nd?2.025?(0.005×?d) or (2) having an nd of greater than 1.85 and a ?d of greater than 35.

Abstract: An optical class comprising, by mass %, 12 to 30% of total of B2O3 and SiO2, 55 to 80% of total of La2O3, Gd2O3, Y2O3, ZrO2, Nb2O5 and WO3, 2 to 10% of ZrO2, 0 to 15% of Nb2O5, 0 to 15% of ZnO and 0% or more but less than 13% of Ta2O5, wherein the ratio of the content of Ta2O5 to the total content of La2O3, Gd2O3, Y2O3, Yb2O3, ZrO2, Nb2O5 and WO3 is 0.23 or less, the ratio of the total content of La2O3, Gd2O3, Y2O3 and Yb2O3 to the total content of B2O3 and SiO2 is from 2 to 4, the optical glass having a refractive index nd of 1.86 or more and an Abbe's number ?d of 38 or more, and a rod shaped glass shaped material and an optical element formed of the above optical glass each.

Abstract: The present invention provides a blue-violet light blocking glass containing copper (I) halide fine particles that satisfactorily transmits light having a wavelength of 450 nm to 600 nm and sharply blocks light having a wavelength shorter than 450 nm. Specifically, the present invention provides a blue-violet light blocking glass containing a copper (I) halide and silver; for example, 20 to 85% by weight of SiO2; 2 to 75% by weight of B2O3; not more than 10% by weight of Al2O3; 2 to 30% by weight of at least one member selected from the group consisting of Li2O, Na2O, K2O, Rb2O and Cs2O; 1 to 15% by weight of at least one member selected from the group consisting of MgO, CaO, SrO, BaO and ZnO; not more than 10% by weight of at least one member selected from the group consisting of PbO, Nb2O5, ZrO2, La2O3, Y2O3, Ta2O3 and Gd2O3; not more than 5% by weight of at least one member selected from the group consisting of Sb2O3 and As2O3; not more than 5% by weight of SnO2; 0.

Abstract: An optical glass composition contains, in % by mole, 14.0% or more and 31.0% or less of SiO2, 19.0% or more and 40.0% or less of B2O3, 0% or more and 5.0% or less of Li2O, 0% or more and 12.0% or less of ZnO, 0% or more and 12.0% or less of ZrO2, 15.0% or more and 26.0% or less of La2O3, 22.0% or more and 38.0% or less of La2O3+ZrO2, 2.0% or more and 5.0% or less of Ta2O5 and 4.0% or more and 16.0% or less of Gd2O3, and has nd of 1.83 or higher and 1.87 or lower and ?d of 43 or higher and 47 or lower, and a preform and an optical element are formed from the optical glass composition.

Abstract: Disclosed herein is an article having: coalesced first and second glasses, wherein: the first glass has at least two different metal oxides, wherein the first glass has a Tg1 and Tx1, and wherein the difference between the Tg1 and the Tx1 is at least 5K, the first glass having less than 20% by weight SiO2, less than 20% by weight B2O3, and less than 40% by weight P2O5; and the second glass has at least two different metal oxides, wherein the second glass has a Tg2 and Tx2, and wherein the difference between the Tg2 and the Tx2 is at least 5K, the second glass having less than 20% by weight SiO2, less than 20% by weight B2O3, and less than 40% by weight P2O5.

Abstract: An optical glass comprising SiO2, B2O3 and La2O3 and one or more oxides selected from the group consisting of ZrO2, Nb2O5 and Ta2O5, having a refractive index of 1.83 or over and an Abbe number of 35 or over and being free of F.

Abstract: A glass composition that simultaneously has a low temperature coefficient of refractive index and a good light transmittance, being suitable for use in environments of intense temperature change. There is provided an optical glass containing SiO2, B2O3 and La2O3, which has a temperature coefficient (20° to 40° C.) of relative refractive index (546.07 nm) of 10.0×10?6 (° C.?1) or below. Further, there is provided an optical glass mentioned above having a temperature coefficient (20° to 40° C.) of relative refractive index (546.07 nm) of 4.6×10?6 (° C.?1) or below.

Abstract: An optical glass having high refractive index and low dispersion properties. There is provided an optical glass having an Abbe number (?d) and a refractive index (nd) in a region indicated by a shape bound by connecting three points, A(53, 1.70), B(53, 1.87), and C(40, 1.87) with straight lines on an orthogonal xy-coordinate system with the x-axis designating the Abbe number and the y-axis designating the refractive index; and comprising no less than 25% and no more than 65% of a combination of a SiO2 component and a B2O3 component, no less than 20% and no more than 55% of a Ln2O3 component (Ln represents at least one species selected from the group consisting of La, Gd, Dy, Yb, and Lu), and a ratio of a La2O3 component to a Ln2O3 component being no more than 0.6, by mol % on the basis of oxides.

Abstract: The present invention provides glass compositions and glass coatings that are lead-free and cadmium-free for use on glass substrates, particularly in automotive applications. The compositions of the present invention provide for chemically durable, blacker colors that are completely suitable for use in automotive glass windows. The compositions include tantalum oxide as a required component.

Abstract: A glass composition consisting essentially of, based on mole percent, 46-56% B2O3, 0.5-8.5% P2O5, SiO2 and mixtures thereof, 20-50% CaO, 2-15% Ln2O3 where Ln is selected from the group consisting of rare earth elements and mixtures thereof; 0-6% M?2O where M? is selected from the group consisting of alkali elements; and 0-10% Al2O3, with the proviso that the composition is water millable.

Abstract: An optical glass consisting essentially of B2O3 in an amount of 10-40 wt %, SiO2 in an amount less than or equal to 5 wt %, ZnO in an amount less than or equal to 15 wt %, SrO in an amount less than or equal to 9 wt %, ZrO2 in an amount less than or equal to 9 wt %, La2O3 in an amount of 15 to 45 wt %, BaF2 in an amount of 1 to 10 wt %, BaO in an amount less than or equal to 5 wt %, HfO2 in an amount of 0.1 to 7.5 wt %, Gd2O3 in an amount less than or equal to 16 wt %, CaO in an amount less than or equal to 7 wt %, ZrF4 in an amount less than or equal to 5 wt %, Na2O in an amount less than or equal to 2 wt % and Y2O3 in an amount less than or equal to 16 wt %. The optical glass has a glass transition temperature in a range of 500-670° C. and a refractive index (nd) in a range of 1.60 to 2.00.

Abstract: The present invention provides a glass composition that has good formability and tends not to cause electric-field breakdown when formed into a spacer for an electron beam-excited display. The present invention relates to a glass composition that contains the following components, in terms of mass %: 20?SiO2<40, 6<B2O3?30, 0?Al2O3?20, 45?(SiO2+B2O3+Al2O3)?74, 0?MgO?15, 5?CaO?40, 0?SrO?30, 0?BaO?25, 0<(SrO+BaO)?50, 20?(MgO+CaO+SrO+BaO)?60, 0?ZnO?10, 0?ZrO2<10, 0?La2O3?20, 0?Y2O3?10, 0?TiO2?3, 1?Fe2O3?12, 0?Nb2O5?10, 0?Ta2O5?10, and 1?TiO2+Fe2O3+Nb2O5+Ta2O5?12 and that is substantially free of alkali metal oxide.

Abstract: A sealant composition for use in sealing solid oxide fuel cells is provided which comprises a glass component which comprises a mixture of alkali-free inorganic oxides, and an optional filler component dispersed in the glass component, said filler component being up to 40% by weight of the composition. The glass component can include, on a mole basis, 20 to 50% BaO, 1 to 10% Y2O3, 5 to 20% B2O3, 10 to 30% SiO2, 3 to 35% MgO, 2 to 20% CaO, 1 to 10% ZnO, and 0 to 5% ZrO2, and exemplary filler components include zirconia, alumina, barium titanate, strontium titanate, and combinations thereof.

Abstract: The present invention relates to an optical glass having optical constants in the form of a refractive index nd of 1.70 or higher and an Abbé number nud of 50 or higher, a preform for precision press molding comprised of this glass, an optical element comprised of this glass, and methods for manufacturing the preform and the optical element.

Abstract: The invention provides: an optical glass which comprises, in terms of % by mass on the basis of oxides, 13-27% of B2O3, 20-35% of La2O3, 5-25% of Gd2O3, 5-20% of ZnO, 0.5-3% of Li2O, 0.5-15% of Ta2O5 and 0.5-10% of WO3, wherein the value of (SiO2+B2O3)/(ZnO+Li2O), which is the mass ratio of the total content of SiO2 and B2O3 to the total content of ZnO and Li2O, is 1.35-1.65; and a lens comprising the optical glass.

Abstract: A vitreous antimicrobial agent that can exhibit excellent antimicrobial properties when added to various types of resins, that has excellent discoloration resistance and hot water resistance, and that can easily be produced at a commercial scale. The vitreous antimicrobial agent includes, relative to 100 mass % of total glass components, 0.1 to 2 mass % of Ag2O, 40.5 to 49 mass % of ZnO, 6 to 9.5 mass % of SiO2, 30.5 to 39.5 mass % of B2O3, 2 to 10 mass % of an alkaline earth metal oxide, and 6 to 7.5 mass % of Na2O; the vitreous antimicrobial agent comprising, in addition to these, 0.01 to 5 mass % of CeO2 as necessary. An antimicrobial resin composition and an antimicrobial product including the vitreous antimicrobial agent.

Abstract: There is provided an optical glass with a high refractive index and a low dispersion having a refractive index (nd) of not less than 1.75 and an Abbe's number (?d) of not less than 35 where the image formation characteristic is hardly affected by changes in temperature of the using environment. SiO2, B2O3 and La2O3 are contained as essential components and the ratio of the constituting components are adjusted whereby an optical glass in which a product of ? and ? where ? is an average linear expansion coefficient at ?30 to +70° C. and ? is an optical elasticity constant at the wavelength of 546.1 nm is not more than 130×10?12° C.?1×nm×cm?1×Pa?1 is able to be achieved.

Abstract: A high-refractive index, low-dispersion optical glass which is small in a change of imaging properties due to a change in temperature of the use environment, specifically one capable of realizing an absolute value of multiplication (?×?) of an average coefficient of linear expansion (?) at from ?30 to +70° C. and a photoelastic constant (?) at a wavelength of 546.1 nm of not more than 130×10?12° C.?1×nm×cm?1×Pa?1, is manufactured without using large qualities of components which are high in an environmental load and scarce mineral resources. The optical glass of the invention has an absolute value of multiplication (?×?) of an average coefficient of linear expansion (?) at from ?30 to +70° C. and a photoelastic constant (?) at a wavelength of 546.1 nm of not more than 130×10?12° C.?1×nm×cm?1×Pa?1; and contains more than 0% of SiO2, B2O3 and La2O3, more than 13% and less than 20% of (ZrO2+Nb2O5) and less than 2.0% of ZnO in terms of % by mass on the oxide basis.

Abstract: Al2O3—Y2O3—ZrO2/HfO2 ceramics (including glasses, crystalline ceramics, and glass-ceramics) and methods of making the same. Ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. The particles and fibers are useful, for example, as thermal insulation, filler, or reinforcing material in composites (e.g., ceramic, metal, or polymeric matrix composites). The thin coatings can be useful, for example, as protective coatings in applications involving wear, as well as for thermal management. Certain ceramic particles according to the present invention can be are particularly useful as abrasive particles.

Abstract: The invention provides an optical glass which comprises, in terms of % by mass on the basis of oxides, 35-45% of SiO2, 12-20% of B2O3, 2-7% of Li2O, 0.1-10% of ZnO, 2-15% of Al2O3, 10-40% of BaO, 0-5% of K2O, 0-10% of Na2O, and 0-20% of Gd2O3, wherein SiO2+B2O3 is 47-58% and Li2O+Na2O+K2O is 5-14%.

Abstract: An optical glass contains, based on a total weight of the optical glass: 12 to 30 weight percent of P2O5; 1 to 5 weight percent of B2O3; 1 to 8 weight percent of Li2O; 0.5 to weight percent of Na2O; 0.5 to 15 weight percent of K2O; 1 to 5 weight percent of CaO; 0 to 20 weight percent of BaO; 0 to 5 weight percent of SrO; 1 to 10 weight percent of TiO2; 1 to 20 weight percent of Bi2O3; 3 to 35 weight percent of Nb2O5; 13 to 60 weight percent of WO3; and 0 to 1 weight percent of Sb2O3, wherein a total weight of Na2O and K2O is in a range of 3 to 20 weight percent based on the total weight of the optical glass.

Abstract: An optical glass having high-refractivity and low-dispersion optical properties and having a low glass transition point so that a heat-treating furnace can be operated for a long period of time. The optical glass has a refractive index nd of at least 1.875, an Abbe's number ?d of at least 39.5 and a glass transition point Tg of 700° C. or lower, and contains at least one of La2O3, Gd2O3, Y2O3 or Yb2O3 and at least one of ZrO2, Ta2O5 or Nb2O5, with a weight ratio of the total content of La2O3, Gd2O3, Y2O3 and Yb2O3 to the total content of SiO2 and B2O3 of from 3.2 to 5 and the weight ratio of the total content of ZrO2, Ta2O5 and Nb2O5 to the total content of SiO2 and B2O3 is from 1.1 to 1.5.

Abstract: Abrasive particles and methods of making the same. Embodiments of the invention can be used to make abrasive particles. The abrasive particles can be incorporated into a variety of abrasive articles, including bonded abrasives, coated abrasives, nonwoven abrasives, and abrasive brushes.

Abstract: An optical glass of the present invention has optical constants of a refractive index (nd) within a range from 1.75 to 1.85 and an Abbe number (? d) within a range from 35 to 45, comprises SiO2 and B2O3 as essential components and one or more components selected from the group consisting of ZrO2, Nb2O5, Ta2O5 and WO3, has a glass transition temperature (Tg) of 580° C. or below and has weathering resistance (surface method) of Class 1 or Class 2.

Abstract: An optical glass whose refractive index is high and whose coloring is decreased comprising, by weight %, 2 to 45% of B2O3, 0 to 30% of SiO2 provided that the content of B2O3>the content of SiO2, 10 to 50% of La2O3, 0 to 30% of TiO2, 0 to 15% of ZnO, 0 to 15% of ZrO2, 0 to 35% of Nb2O5, 0 to 35% of BaO, 0 to 5% of SrO, 0% or more but less than 8% of CaO, 0% or more but less than 13% of MgO, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd2O3, 0 to 15% of Y2O3, 0 to 18% of Ta2O5, 0% or more but less than 0.5% of WO3, 0% or more but less than 1.5% of a total of Na2O, K2O and Li2O, 0 to 10% of GeO2, 0 to 20% of Bi2O3, 0 to 10% of Yb2O3, 0 to 10% of Al2O3, 0% or more but less than 2% of Sb2O3 and 0 to 1% of SnO2.

Abstract: [Object] To provide a high-refractivity high-dispersion optical glass having excellent stability [Solution Means] An optical glass which is formed of an oxide glass containing 30 to 70 cationic % of Bi3+ and has a liquidus temperature of 800° C. or lower.

Abstract: An object of the present invention is to provide a lead-free bismuth glass wherein decrease of the degree of accuracy of the patterning is prevented. Specifically, the present invention provides a lead-free bismuth glass characterized in that said lead-free bismuth glass is used for an optical patterning glass material which is patterned by light irradiation and the optical-absorption coefficient to light with a wavelength of 365 nm is 300 to 3000 cm?1.

Abstract: An adhesive agent for fluorescent dyes for adhering a fluorescent layer on a substrate, wherein the adhesive agent contains or consists of a glass composition.

Abstract: Pressable glass-ceramic compositions for dental purposes of the composition I, II or III I II III ZrO2 17-70%? ZrO2/Al2O3 15-70%? Al2O3 ??15-70% SiO2 17-59%? SiO2 17-59%? SiO2 ??17-59% Al2O3 ?2-15% ZrO2 ?2-15% ZrO2 ???2-15% Y2O3 ??0-6% Y2O3 ??0-6% Y2O3 ???0-6% K2O 3-12.5%? K2O 3-12.5%? K2O ?3-12.5% Na2O 0.2-8.5%?? Na2O 0.2-8.5%?? Na2O 0.2-8.5% Li2O 0-1.5% Li2O 0-1.5% Li2O ???0-1.5% CaO 0.3-2% CaO 0.3-2% CaO ???0.3-2% B2O3 0.1-5% B2O3 0.1-5% B2O3 ???0.1-5% F 0-2.5% F 0-2.5% F ???0-2.5% CeO2 0.2-2% CeO2 0.2-2% CeO2 ???0.2-2% TiO2 0-1.5% TiO2 0-1.5% TiO2 ???0-1.5% are particularly suitable for the manufacturing of ceramic veneer frames.

Abstract: An optical glass of the present invention has optical constants with a refractive index (nd) of 1.74 to 1.76 and an Abbe number (?d) of 45 to 49.5, contains SiO2, B2O3, BaO, ZnO, La2O3, Gd2O3, TiO2, Al2O3, and Li2O as essential components, does not contain Ta2O5, GeO2, or ZrO2 which usually affects the stabilization of glass, does not contain lead, arsenic, or fluorine having adverse effects on the environment, and has a glass transition point Tg of 530 to 590° C. According to the present invention, a stable glass for precision press-molding can be provided which has a low glass transition temperature (Tg), has a high refractive index and a low dispersion property, and does not contain expensive Ta2O5, GeO2, ZrO2, or Y2O3.

Abstract: This invention provides an optical glass including, by mass %: 30 to 40% of B2O3; 2.5 to 6% of Li2O; 10 to 17% of ZnO; 12 to 22% of La2O3; 15 to 25% of Gd2O3; 0 to 5% of SiO2; 0 to 5% of Bi2O3; 0 to 15% of Al2O3; 0 to 3% of ZrO2; 0 to 5% of WO3; 0 to 5% of Ta2O5; 0 to 3% of TiO2; 0 to 5% of Y2O3; and 0 to 5% of MgO+CaO+SrO+BaO.

Abstract: A high-refractivity low-dispersion optical glass that gives press-molding preforms excellent in high-temperature shapability and suitable for precision press-molding, including an optical glass comprising B2O3, La2O3, Gd2O3 and ZnO as essential components, substantially containing none of lead and fluorine, having a refractive index (nd) of 1.72 to 1.83, an Abbe's number (?d) of 45 to 55 and a glass transition temperature (Tg) of 630° C. or lower and having a viscosity of at least 0.6 Pa·s at its liquidus temperature, and an optical glass comprising, by mol %, 45 to 65% of B2O3, 5 to 22% of La2O3, 1 to 20% of Gd2O3, provided that the total content of La2O3 and Gd2O3 is 14 to 30%, 5 to 30% of ZnO, 0 to 10% of SiO2, 0 to 6.5% of ZrO2 and 0 to 1% of Sb2O3, substantially containing none of lead and fluorine, and having a refractive index (nd) of 1.72 to 1.83 and an Abbe's number (?d) of 45 to 55.

Abstract: The present invention provides an optical glass including, by mass %: 46 to 70 of B2O3; 3 to 10 of Li2O; 5 to 15 of Y2O3; 0 to 46 of SiO2: 0 to 20 of Al2O3: 0 to 40 of MgO+CaO+SrO+BaO; 0 to 30 of La2O3; and 0 to 10 of ZrO2+TiO2+Gd2O3.

Abstract: The present invention refers to optical glasses designated to be used in the areas of imaging, sensors, microscopy, medical technology, digital projection, photolithography, laser technology, wafer/chip technology as well as telecommunications, optical communications engineering and optics/illumination in the automotive sector with a refractive index nd of 1.60?nd?1.72 and/or an Abbe number vd of 32?vd?45 with pronounced short flint character, good chemical resistance, excellent resistance to crystallization, good solarization stability and the following composition (in % by weight based on oxides): SiO2 30-45 B2O3 ?8-12 Na2O ?8-15 CaO 0.

Abstract: Provided is an optical glass comprising, denoted as molar percentages: 10 to 20 percent SiO2, 5 to 40 percent B2O3, SiO2+B2O3=15 to 50 percent, 0 to 10 percent Li2O, 12 to 36 percent ZnO, where 3×Li2O+ZnO?18 percent, 5 to 30 percent La2O3, 0 to 20 percent Gd2O3, 0 to 10 percent Y2O3, La2O3+Gd2O3=10 to 30 percent, La2O3/SIGMA(?)RE2O3=0.67 to 0.95 (where SIGMA(?)RE2O3=La2O3+Gd2O3+Y2O3+Yb2O3+Sc2O3+Lu2O3), 0.5 to 10 percent ZrO2, 1 to 15 percent Ta2O5, 1 to 20 percent WO3, Ta2O5/WO3?2.5 (molar ratio), 0 to 8 percent Nb2O5, 0 to 8 percent TiO2; and having a refractive index nd of not less than 1.87 and an Abbé number nu(v)d of not less than 35 but less then 40. A method for manufacturing a preform for precision press molding by separating a glass melt gob from a glass melt obtained by mixing, heating, and melting glass starting materials, and forming a preform in a glass melt gob cooling step, said mixing, heating, and melting of glass starting materials is conducted so as to obtain the above optical glass.

Abstract: An optical glass composition contains, in % by weight, 1.0% or more and 12.0% or less of SiO2, 8.0% or more and 18.0% or less of B2O3, 0% or more and 6.0% or less of ZnO, 1.0% or more and 10.0% or less of ZrO2, 25.0% or more and 47.0% or less of La2O3, 0% or more and 5.0% or less of R2O (here, R is at least one of Li, Na and K), 0% or more and 15.0% or less of Nb2O5, 0% or more and 7.0% or less of TiO2, 0% or more and 15.0% or less of Ta2O5, 1.0% or more of Nb2O5+TiO2+Ta2O5, 0% or more and 25.5% or less of Gd2O3, 0.5% or more and 15.0% or less of WO3 and 0.5% or more and 26.0% or less of Gd2O3+WO3, and has nd of 1.88 or higher and 1.92 or lower and ?d of 33 or higher and 37 or lower, and a preform and an optical element are formed from the optical glass composition.