CA1041558A - High index ophthalmic glasses - Google Patents
High index ophthalmic glassesInfo
- Publication number
- CA1041558A CA1041558A CA224,871A CA224871A CA1041558A CA 1041558 A CA1041558 A CA 1041558A CA 224871 A CA224871 A CA 224871A CA 1041558 A CA1041558 A CA 1041558A
- Authority
- CA
- Canada
- Prior art keywords
- glasses
- weight
- high index
- ophthalmic
- al2o3
- 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
Links
- 239000011521 glass Substances 0.000 title claims abstract 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract 2
- 229910052681 coesite Inorganic materials 0.000 claims abstract 2
- 229910052593 corundum Inorganic materials 0.000 claims abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract 2
- 239000000377 silicon dioxide Substances 0.000 claims abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract 2
- 229910052682 stishovite Inorganic materials 0.000 claims abstract 2
- 229910052905 tridymite Inorganic materials 0.000 claims abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims 1
- 238000007792 addition Methods 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 claims 1
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 238000007654 immersion Methods 0.000 claims 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims 1
- 230000004580 weight loss Effects 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract 1
Landscapes
- Glass Compositions (AREA)
- Eyeglasses (AREA)
Abstract
HIGH INDEX OPHTHALMIC GLASSES
Abstract of the Disclosure This invention relates to soft, low expansion, high durability, high refractive index glasses especially suitable for the production of segments or buttons for multifocal ophthalmic lenses and, in particular, photo-chromic ophthalmic lenses. The glasses demonstrate refrac-tive indices between about 1.58-1.71, softening points between about 630°-675°C., strain points between about 450°-500°C., good chemical durability, and coefficients of thermal expansion (25°-300°C.) between about 45-60 x 10-7/°C. The glasses consist essentially, by weight on the oxide basis, of about 3-7% B2O3, 3-8% Al2O3, 30-60% PbO, and 30-55% SiO2.
Abstract of the Disclosure This invention relates to soft, low expansion, high durability, high refractive index glasses especially suitable for the production of segments or buttons for multifocal ophthalmic lenses and, in particular, photo-chromic ophthalmic lenses. The glasses demonstrate refrac-tive indices between about 1.58-1.71, softening points between about 630°-675°C., strain points between about 450°-500°C., good chemical durability, and coefficients of thermal expansion (25°-300°C.) between about 45-60 x 10-7/°C. The glasses consist essentially, by weight on the oxide basis, of about 3-7% B2O3, 3-8% Al2O3, 30-60% PbO, and 30-55% SiO2.
Claims (2)
1. An ophthalmic glass exhibiting a refractive index between about 1.58-1.71, a softening point between about 630°-675°C., a strain point between about 450°-500°C., a coefficient of thermal expansion (25°-300°C.) between about 45-60 x 10-7/°C., and no surface imperfection with a weight loss of no more than about 0.03 mg/cm2 after immersion into a 10% by weight aqueous solution of HCl for ten minutes at 25°C., consisting essentially, by weight on the oxide basis, of about 3-7% B2O3, 3-8% Al2O3, 30-60% PbO, and 30-55% SiO2.
2. A glass according to Claim 1 also containing up to 6% La2O3, up to 10% BaO, up to 3% LiO2 and/or Na2O, and up to 3% TiO2, the sum of all such additions constituting no more than 10% of the total composition.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47566574A | 1974-06-03 | 1974-06-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1041558A true CA1041558A (en) | 1978-10-31 |
Family
ID=23888574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA224,871A Expired CA1041558A (en) | 1974-06-03 | 1975-04-17 | High index ophthalmic glasses |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5846460B2 (en) |
| BR (1) | BR7503107A (en) |
| CA (1) | CA1041558A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3117000C2 (en) * | 1981-04-29 | 1986-05-28 | Schott Glaswerke, 6500 Mainz | Phototropic glass with a refractive index? 1.59, an Abbe number? 40 and a density ≦ 3.2 g / cm? 3? |
-
1975
- 1975-04-17 CA CA224,871A patent/CA1041558A/en not_active Expired
- 1975-05-20 BR BR7503963D patent/BR7503107A/en unknown
- 1975-06-02 JP JP6636075A patent/JPS5846460B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS516214A (en) | 1976-01-19 |
| JPS5846460B2 (en) | 1983-10-17 |
| BR7503107A (en) | 1976-05-25 |
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