JPH0144652B2 - - Google Patents
Info
- Publication number
- JPH0144652B2 JPH0144652B2 JP60023587A JP2358785A JPH0144652B2 JP H0144652 B2 JPH0144652 B2 JP H0144652B2 JP 60023587 A JP60023587 A JP 60023587A JP 2358785 A JP2358785 A JP 2358785A JP H0144652 B2 JPH0144652 B2 JP H0144652B2
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- weight
- less
- glass
- refractive index
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- 239000011521 glass Substances 0.000 claims description 25
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 19
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 claims description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 7
- 239000000395 magnesium oxide Substances 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 5
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 2
- 229910000410 antimony oxide Inorganic materials 0.000 claims 2
- 229910000413 arsenic oxide Inorganic materials 0.000 claims 2
- 229960002594 arsenic trioxide Drugs 0.000 claims 2
- KTTMEOWBIWLMSE-UHFFFAOYSA-N diarsenic trioxide Chemical compound O1[As](O2)O[As]3O[As]1O[As]2O3 KTTMEOWBIWLMSE-UHFFFAOYSA-N 0.000 claims 2
- 229910000464 lead oxide Inorganic materials 0.000 claims 2
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 claims 2
- 239000011787 zinc oxide Substances 0.000 claims 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 229910010413 TiO 2 Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 3
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000005354 aluminosilicate glass Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000005355 lead glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000008395 clarifying agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- UFQXGXDIJMBKTC-UHFFFAOYSA-N oxostrontium Chemical compound [Sr]=O UFQXGXDIJMBKTC-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
- C03C3/105—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Glass Compositions (AREA)
Description
〔発明の技術分野〕
本発明は転移点が700℃以上、軟化点が900℃以
上の熱特性を有し、かつ屈折率（nD）が1.6以上
の光学的特性を有する高温用高屈折率ガラスに関
する。
〔発明の技術的背景とその問題点〕
一般にストーブトツプ用ガラスや燃焼管用ガラ
スとしてアルミノ珪酸塩ガラスが実用化されてい
る。すなわち、ガラス組成としてRO−Al2O3−
SiO2系（ただしROは修飾酸化物）が採用されて
いる。この種ガラスとしてはたとえばコーニング
社の＃1710、＃1720ガラスがこれに相当し、それ
ぞれ900℃以上の軟化点を有し、石英ガラスの代
替品として耐熱性を必要とするハロゲンランプ用
バルブ材料に応用されている。しかしながら、こ
れらガラスに使用されるガラス成分はROとして
CaO、MgO、BaOなどが多くBaOを除いては
SiO2、Al2O3ともに屈折率への影響が少なく、ま
たBaOの単一成分であつてもその屈折率を極端
に増加させることには限界がある。
従来、屈折率を増加させるガラス成分として
TiO2、ZrO2、BaO、La2O3、PbO等が知られて
おり、一般光学ガラスとしてはBaSF7などのよう
にTiO2を含む鉛ガラスが主体であつた。ところ
がこれらの鉛ガラスは屈折率としては1.70程度と
比較的高い屈折率が容易に得られる反面、軟化点
が低いので高温での使用に耐えられる物理特性を
得ることが極めて困難であつた。
〔発明の目的〕
本発明は上記事情にもとづきなされたもので、
高温度における使用状態に十分耐え得る高い転移
点および軟化点を有し、しかも高屈折率を有して
特に光学用に好適な高温用高屈折率ガラスを提供
することを目的とする。
〔発明の概要〕
本発明は上記目的を達成するためにアルミノシ
リケート系ガラス、（RO−Al2O3−SiO2）をベー
スとしてROを酸化チタン（TiO2）、酸化ジルコ
ニウム（ZrO2）、酸化バリウム（BaO）、酸化ラ
ンタン（La2O3）、酸化鉛（PbO）等の高屈折率
酸化物で置換するとともに、これらを含むガラス
組成の最適範囲を求めたことにある。
〔発明の実施例〕
以下、本発明の詳細を実施例について説明す
る。本実施例としてのガラス組成は、酸化珪素
（SiO2）−酸化アルミニウム（Al2O3）−酸化バリ
ウム（BaO）−酸化ランタン（La2O3）を必須成
分とするとともにこれに酸化チタン（TiO2）、酸
化鉛（PbO）、酸化ジルコニウム（ZrO2）等の高
屈折率成分を付加してなるものである。
そして上記ガラス組成におけるそれぞれの化学
成分決定にあたり、もつとも問題となつた特性上
の問題点はバーナによる熱加工時において発生す
る再発泡現象（リボイリング）を防止するための
構成である。すなわち、いつたんチユーブまたは
バルブなどに成形されたガラスのフレームによる
再加工または再加熱に際しガラス中に無数の小気
泡が発生し、このためガラスが透過性を失ない、
白色に変質し外観、強度ともに劣化にいたる現象
である。ここにおいて本発明者は、酸化アルミニ
ウム、酸化バリウム、酸化ランタン等の高屈折率
を維持する成分と、酸化マグネシウム（MgO）、
酸化カルシウム（CaO）、酸化ストロンチウム
（SrO）などの２価のアルカリ土類金属酸化物と
の相互関係を前記特許請求の範囲に示すように調
整することにより上記リボイリング傾向が最少と
なることを見出したのである。
すなわち、本発明の高温用高屈折率ガラスは重
量％で以下に示す組成からなる。
SiO2 35〜55重量％
Al2O3 10〜18 〃
BaO 10〜35 〃
La2O3
TiO2
ZrO2
PbO 10〜30 〃
０〜10 〃
０〜５ 〃
０〜15 〃 合量12〜32重量％
MgO
CaO
SrO
ZnO ０〜５ 〃
０〜10 〃
０〜10 〃
０〜５ 〃 合量１〜15 〃
As2O3 ０〜0.5重量％
Sb2O3 ０〜0.5 〃 合量0.02〜0.8重量％
転化点 700℃以上
添加点 900℃以上
屈折率（nD） 1.6以上
以下、各成分の限定理由について述べる。
SiO2は絶対必要なガラス形成酸化物であり35％
を下回ることはガラス構造が緩くなり軟化点、化
学的耐久性が低下して不可であり、また55％を上
回ると屈折率が低くなりすぎ不可である。Al2O3
も必須成分であり10％を下回ると高軟化点が得ら
れず、18％を上回るとガラスの粘性が高くなり成
形を困難とする。BaOは10％を下回ると高屈折
率が得られず、また35％を上回るとガラスの失透
傾向が生じて不可となる。La2O3も必須構成成分
であり、屈折率の維持には10〜30％を必要とする
がTiO2、ZnO2、PbOなどを選択成分として添加
し、これらの合量で12〜32％が必要である。
MgO、CaO、SrO、ZnOはその合量で１〜15％
の範囲内にあつてリボイリング現象を阻止する作
用がある。最後にAs2O3とSb2O3は共に清澄剤と
して添加されるもので合量で0.8％を上限とし、
これを上回るとリボイリングが加速され好ましく
ない。また転移点700℃、軟化点900℃をそれぞれ
下回ることは高温用ガラスとして使用することが
できない。また屈折率1.6を下回ることはレンズ
効果が期待できず不可である。
次表は上記構成にもとづき行なつた各種実施例
において、それぞれ組成を異にして製作した試料
について、その物理的ならびに光学的性質の変化
について比較例とともに示したものである。
これら試料ガラスの製作については、あらかじ
め所定量に調合した原料を白金るつぼ内に投入し
たのち、溶融温度1550℃〜1600℃で溶融し、チユ
ーブまたは棒状に加工して試料とした。
[Technical Field of the Invention] The present invention provides a high refractive index material for high temperature use, which has thermal properties with a transition point of 700°C or higher, a softening point of 900°C or higher, and optical properties with a refractive index (n D ) of 1.6 or higher. Regarding glass. [Technical background of the invention and its problems] Aluminosilicate glass is generally put into practical use as stove top glass and combustion tube glass. In other words, the glass composition is RO−Al 2 O 3 −
SiO 2 type (RO is a modified oxide) is used. Examples of this type of glass include Corning's #1710 and #1720 glasses, which each have a softening point of 900°C or higher, and are used as a substitute for quartz glass for halogen lamp bulb materials that require heat resistance. It is applied. However, the glass components used in these glasses are
There are many CaO, MgO, BaO, etc. except for BaO.
Both SiO 2 and Al 2 O 3 have little effect on the refractive index, and even if BaO is a single component, there is a limit to extremely increasing the refractive index. Conventionally, as a glass component that increases the refractive index.
TiO 2 , ZrO 2 , BaO, La 2 O 3 , PbO, etc. are known, and lead glass containing TiO 2 such as BaSF 7 has been the main type of general optical glass. However, although these lead glasses can easily have a relatively high refractive index of about 1.70, they have a low softening point, making it extremely difficult to obtain physical properties that can withstand use at high temperatures. [Object of the invention] The present invention was made based on the above circumstances, and
It is an object of the present invention to provide a high-temperature high-refractive-index glass that has a high transition point and softening point that can sufficiently withstand usage conditions at high temperatures, and also has a high refractive index and is particularly suitable for optical applications. [Summary of the Invention] In order to achieve the above object, the present invention is based on aluminosilicate glass, (RO- Al2O3 - SiO2 ) , and RO is made of titanium oxide ( TiO2 ), zirconium oxide ( ZrO2 ), The aim is to substitute high refractive index oxides such as barium oxide (BaO), lanthanum oxide (La 2 O 3 ), and lead oxide (PbO), and to find the optimal range of glass compositions containing these. [Examples of the Invention] The details of the present invention will be described below with reference to Examples. The glass composition in this example has silicon oxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), barium oxide (BaO), and lanthanum oxide (La 2 O 3 ) as essential components, and titanium oxide ( It is made by adding high refractive index components such as TiO 2 ), lead oxide (PbO), and zirconium oxide (ZrO 2 ). In determining the respective chemical components in the above glass composition, the problem in terms of characteristics that originally posed a problem was the structure for preventing the re-foaming phenomenon (reboiling) that occurs during thermal processing using a burner. That is, when the glass is reprocessed or reheated once it is formed into a tube or bulb, numerous small bubbles are generated in the glass, so that the glass does not lose its transparency.
This is a phenomenon that changes the color to white and leads to deterioration in both appearance and strength. Here, the present inventor has developed a combination of components that maintain a high refractive index such as aluminum oxide, barium oxide, and lanthanum oxide, and magnesium oxide (MgO),
It has been discovered that the reboiling tendency described above can be minimized by adjusting the interaction with divalent alkaline earth metal oxides such as calcium oxide (CaO) and strontium oxide (SrO) as shown in the claims above. It was. That is, the high refractive index glass for high temperature use of the present invention has the composition shown below in weight percent. SiO 2 35-55% by weight Al 2 O 3 10-18 〃 BaO 10-35 〃 La 2 O 3 TiO 2 ZrO 2 PbO 10-30 〃 0-10 〃 0-5 〃 0-15 〃 Total amount 12-32 Weight% MgO CaO SrO ZnO 0-5 〃 0-10 〃 0-10 〃 0-5 〃 Total amount 1-15 〃 As 2 O 3 0-0.5 Weight% Sb 2 O 3 0-0.5 〃 Total amount 0.02-0.8 Weight % Conversion point 700°C or higher Addition point 900°C or higher Refractive index (n D ) 1.6 or higher The reason for limiting each component will be described below.
SiO2 is an absolutely necessary glass-forming oxide and 35%
If it is less than 55%, it is unacceptable because the glass structure becomes loose and the softening point and chemical durability are lowered, and if it exceeds 55%, the refractive index becomes too low, which is unacceptable. Al2O3 _
is an essential component; if it is less than 10%, a high softening point cannot be obtained, and if it is more than 18%, the viscosity of the glass becomes high, making it difficult to mold. If BaO is less than 10%, a high refractive index cannot be obtained, and if it exceeds 35%, the glass tends to devitrify, making it unsuitable. La 2 O 3 is also an essential component and requires 10-30% to maintain the refractive index, but by adding TiO 2 , ZnO 2 , PbO, etc. as selective components, the total amount of these can be increased to 12-32%. is necessary.
The total amount of MgO, CaO, SrO, and ZnO is 1 to 15%
Within this range, it has the effect of inhibiting the reboiling phenomenon. Finally, As 2 O 3 and Sb 2 O 3 are both added as clarifying agents, and the total amount is limited to 0.8%.
If it exceeds this, reboiling will be accelerated, which is not preferable. Furthermore, if the transition point is lower than 700°C and the softening point is lower than 900°C, it cannot be used as a high-temperature glass. Furthermore, a refractive index of less than 1.6 is not acceptable because no lens effect can be expected. The following table shows the changes in physical and optical properties of samples fabricated with different compositions in various Examples based on the above configuration, together with comparative examples. To manufacture these sample glasses, raw materials prepared in advance in a predetermined amount were put into a platinum crucible, then melted at a melting temperature of 1550°C to 1600°C, and processed into tubes or rods to prepare samples.
本発明は以上詳述したように、アルミノ、シリ
ケートガラスRO−Al2O3−SiO2系をベースとし
ROを酸化チタン（TiO2）、酸化ジルコニウム
（ZrO2）、酸化バリウム（BaO）、酸化ランタン
（La2O3）、酸化鉛（PbO）等の高屈折率酸化物で
置換し、さらに安定化剤として２価のアルカリ土
類金属酸化物を加えてなる高温用高屈折率ガラス
であるから、
１ ガラス転移点が700℃以上、軟化点が900℃以
上の高い熱特性を有することができる。
２ 屈折率（nD）が1.60以上という高い値を有す
るので、たとえば赤外線測定用光学フアイバー
の被覆用ガラス等に利用できる利点を有する。
As detailed above, the present invention is based on alumino, silicate glass RO-Al 2 O 3 -SiO 2 system.
Further stabilization is achieved by replacing RO with high refractive index oxides such as titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), barium oxide (BaO), lanthanum oxide (La 2 O 3 ), and lead oxide (PbO). Since it is a high-temperature high-refractive-index glass made by adding a divalent alkaline earth metal oxide as an agent, it can have high thermal properties with a glass transition point of 700°C or higher and a softening point of 900°C or higher. 2. Since it has a high refractive index (n D ) of 1.60 or more, it has the advantage that it can be used, for example, as a coating glass for optical fibers for infrared measurement.
Claims (1)
〜18重量％、酸化バリウム10〜35重量％、酸化カ
ルシウム10重量％以下、酸化ストロンチユム10重
量％以下、酸化マグネシウム５重量％以下、酸化
亜鉛５重量％以下で上記酸化カルシウム、酸化ス
トロンチウム、酸化マグネシウムおよび酸化亜鉛
の合量で１〜15重量％、酸化ランタン10〜30重量
％、酸化鉛15重量％以下、酸化チタン10重量％以
下、酸化ヂルコニウム５重量％以下で、上記酸化
ランタン、酸化鉛、酸化チタンおよび酸化ヂルコ
ニウムの合量で12〜32重量％、酸化砒素0.5重量
％以下、酸化アンチモン0.5重量％以下で、上記
酸化砒素および酸化アンチモンの合量で0.02〜
0.8重量％の組成を有し、かつ転移点が700℃以
上、軟化点が900℃以上で屈折率（nD）が1.6以上
であることを特徴とする高温用高屈折率ガラス。1 Silicon oxide 35-55% by weight, aluminum oxide 10
~18% by weight, barium oxide 10-35% by weight, calcium oxide 10% by weight or less, strontium oxide 10% by weight or less, magnesium oxide 5% by weight or less, zinc oxide 5% by weight or less of the above calcium oxide, strontium oxide, magnesium oxide. And the total amount of zinc oxide is 1 to 15% by weight, lanthanum oxide 10 to 30% by weight, lead oxide 15% or less, titanium oxide 10% or less, zirconium oxide 5% or less by weight, the above lanthanum oxide, lead oxide, The total amount of titanium oxide and zirconium oxide is 12 to 32% by weight, arsenic oxide is 0.5% by weight or less, antimony oxide is 0.5% by weight or less, and the total amount of arsenic oxide and antimony oxide is 0.02 to 32% by weight.
A high refractive index glass for high temperature use, having a composition of 0.8% by weight, having a transition point of 700°C or higher, a softening point of 900°C or higher, and a refractive index (n D ) of 1.6 or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60023587A JPS61186245A (en) | 1985-02-12 | 1985-02-12 | Glass having high refractive index for high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60023587A JPS61186245A (en) | 1985-02-12 | 1985-02-12 | Glass having high refractive index for high temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61186245A JPS61186245A (en) | 1986-08-19 |
| JPH0144652B2 true JPH0144652B2 (en) | 1989-09-28 |
Family
ID=12114712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60023587A Granted JPS61186245A (en) | 1985-02-12 | 1985-02-12 | Glass having high refractive index for high temperature |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61186245A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012121757A (en) * | 2010-12-08 | 2012-06-28 | Nippon Electric Glass Co Ltd | High-refractive-index glass |
| WO2020112386A1 (en) * | 2018-11-30 | 2020-06-04 | Corning Incorporated | High index low density glass |
-
1985
- 1985-02-12 JP JP60023587A patent/JPS61186245A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61186245A (en) | 1986-08-19 |
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