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US4038448A
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Composite glass articles spontaneous opal glass and enamel of Li2 -O-B2 -O3 -TiO2 -ZrO2 -PbO-SiO2
Assignee: Corning Glass Works
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Filing: 1976-06-04
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Granted: 1977-07-26
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Expires: 1996-06-04
Abstract
Abstract This invention relates to the production of a composite article consisting of an opal glass body exhibiting a dense, milky-white appearance coated with an adherent enamel demonstrating high gloss and exceptional chemical durability. More specifically, the opal glasses of the present invention have compositions within the Na 2 O-Al 2 O 3 -SiO 2 -F system and demonstrate a softening point in excess of 760° C., a strain point in excess of 490° C., and a coefficient of thermal expansion (0°-300° C.) of about 66-75 × 10.sup. -7 /° C. The enamels of the instant invention have flux compositions within the Li 2 O-B 2 O 3 -TiO 2 -ZrO 2 -PbO-SiO 2 system, will fire to a high gloss in less than about 10 minutes at temperatures below about 720° C., will exhibit coefficients of thermal expansion (25°-300° C.) about 3-10 points lower than the opal glass substrate, will demonstrate lead release after chemical attack of less than about 2 μg/cm 2 , and will manifest excellent resistance to dishwasher detergents.
Inventors
- 👤 David C. Boyd
- 👤 Francis A. Cantaloupe
- 👤 William H. Dumbaugh, Jr.
- 👤 James E. Flannery
- 👤 Louis M. Holleran
- 👤 Sylvester R. Sandor
- 👤 Dale R. Wexell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:26
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/02; C03C4/00; C03C4/005; C03C8/00; C03C8/02; C03C8/10; C03C8/12; C03C2205/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
201 words
A composite article consisting of an opal glass body exhibiting a dense, milky-white appearance and an adherent enamel demonstrating high gloss and exceptional chemical durability, said opal glass consisting essentially, in weight percent on the oxide basis, of about 8-13% Na 2 O, 5-9% Al 2 O 3 , 74-78% SiO 2 , and 3.5-4.5% F as analyzed, and said enamel having a flux composition being essentially free from alkali metal oxides other than Li 2 O and consisting essentially, in weight percent on the oxide basis, of about 0.5-3% Li 2 O, 4-8% B 2 O 3 , 1-5% TiO 2 , 3-8% ZrO 2 , 45-55% PbO, and 28-38% SiO 2 , wherein opal glass exhibits softening point in excess of 760° C., a strain point in excess of 490° C., and a coefficient of thermal expansion (0°-300° C.) of about 66-75×10.sup. -7 /° C., and wherein said enamel flux exhibits a coefficient of thermal expansion (25°-300° C.) about 3-10 points lower than that of said opal glass, a lead release after chemical attack of less than 2 μg/cm 2 , and will fire to a high gloss in less than about ten minutes at temperatures below 720° C.
Claim 2
Dependent Claim
201 words
A composite article consisting of an opal glass body exhibiting a dense, milky-white appearance and an adherent enamel demonstrating high gloss and exceptional chemical durability, said opal glass consisting essentially, in weight percent on the oxide basis, of about 8-13% Na 2 O, 5-9% Al 2 O 3 , 74-78% SiO 2 , and 3.5-4.5% F as analyzed, and said enamel having a flux composition being essentially free from alkali metal oxides other than Li 2 O and consisting essentially, in weight percent on the oxide basis, of about 0.5-3% Li 2 O, 4-8% B 2 O 3 , 1-5% TiO 2 , 3-8% ZrO 2 , 45-55% PbO, and 28-38% SiO 2 , wherein opal glass exhibits softening point in excess of 760° C., a strain point in excess of 490° C., and a coefficient of thermal expansion (0°-300° C.) of about 66-75×10.sup. -7 /° C., and wherein said enamel flux exhibits a coefficient of thermal expansion (25°-300° C.) about 3-10 points lower than that of said opal glass, a lead release after chemical attack of less than 2 μg/cm 2 , and will fire to a high gloss in less than about ten minutes at temperatures below 720° C.
Claim 3
Dependent Claim
24 words
A composite article according to claim 1 wherein said opal glass also contains 0-4% K 2 O, 0-2.5% SrO, and 0-1% Li 2 O.
Claim 4
Dependent Claim
36 words
A composite article according to claim 1 wherein the sum of all additions to the Na 2 O-Al 2 O 3 -SiO 2 -F opal glass system is no more than 5% of the total composition.
Claim 5
Dependent Claim
45 words
A composite article according to claim 2 wherein said opal glass consists essentially, in weight percent on the oxide basis, of about 11.8% Na 2 O, 6% Al 2 O 3 , 77% SiO 2 , 1.2% K 2 O, and 4% F as analyzed.
Claim 6
Dependent Claim
40 words
A composite article according to claim 1 wherein said enamel flux also contains 0-4% CdO, 0-3% ZnO, 0-3% Al 2 O 3 , 0-3% Y 2 O 3 , 0-4% Ta 2 O 5 , and 0-2% SnO 2 .
Claim 7
Dependent Claim
38 words
A composite article according to claim 1 wherein the sum of all additions to the Li 2 O-B 2 O 3 -TiO 2 -ZrO 2 -PbO-SiO 2 enamel flux is no more than 8% of the total composition.
Claim 8
Dependent Claim
76 words
A spontaneous opal glass body exhibiting a dense, milky-white appearance, a softening point in excess of 760° C., a strain point in excess of 490° C., and a coefficient of thermal expansion (0°-300° C.) of about 66-75 × 10.sup. -7 /° C. consisting essentially, in weight percent on the oxide basis, of about 11.8% Na 2 O, 6% Al 2 O 3 , 77% SiO 2 , 1.2% K 2 O, and 4% F, as analyzed.
Claim 9
Dependent Claim
76 words
A spontaneous opal glass body exhibiting a dense, milky-white appearance, a softening point in excess of 760° C., a strain point in excess of 490° C., and a coefficient of thermal expansion (0°-300° C.) of about 66-75 × 10.sup. -7 /° C. consisting essentially, in weight percent on the oxide basis, of about 11.8% Na 2 O, 6% Al 2 O 3 , 77% SiO 2 , 1.2% K 2 O, and 4% F, as analyzed.
Claim 10
Dependent Claim
104 words
An enamel having a flux composition essentially free from alkali metal oxides other than Li 2 O which exhibits a coefficient of thermal expansion (25°-300° C.) of about 57-70 × 10.sup. -7 /° C., a lead release after chemical attack of less than about 2 μg/cm 2 , and will fire to a high gloss in less than about 10 minutes at temperatures below 720° C., said flux consisting essentially, in weight percent on the oxide basis, of about 0.5-3% Li 2 O, 4-8% B 2 O 3 , 1-5% TiO 2 , 3-8% ZrO 2 , 45-55% PbO, and 28-38% SiO 2 .
Claim 11
Dependent Claim
104 words
An enamel having a flux composition essentially free from alkali metal oxides other than Li 2 O which exhibits a coefficient of thermal expansion (25°-300° C.) of about 57-70 × 10.sup. -7 /° C., a lead release after chemical attack of less than about 2 μg/cm 2 , and will fire to a high gloss in less than about 10 minutes at temperatures below 720° C., said flux consisting essentially, in weight percent on the oxide basis, of about 0.5-3% Li 2 O, 4-8% B 2 O 3 , 1-5% TiO 2 , 3-8% ZrO 2 , 45-55% PbO, and 28-38% SiO 2 .
Claim 12
Dependent Claim
38 words
An enamel according to claim 8 wherein said flux also contains 0-4% CdO, 0-3% ZnO, 0-3% Al 2 O 3 , 0-3% Y 2 O 3 , 0-4% Ta 2 O 5 , and 0-2% SnO 2 .
Claim 13
Dependent Claim
36 words
An enamel according to claim 8 wherein the sum of all additions to the Li 2 O-B 2 O 3 -TiO 2 -ZrO 2 -PbO-SiO 2 system is no more than 8% of the total composition.
Claim 14
Dependent Claim
48 words
An enamel according to claim 9 wherein said enamel flux consists essentially, in weight percent on the oxide basis, of about 1-1.5% Li 2 O, 5-6% B 2 O 3 , 2-2.5% TiO 2 , 4-6% ZrO 2 , 48-51% PbO, 1-2% CdO, and 33-37% SiO 2 .
References Cited (Backward Citations)
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US3404027A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |