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US4376169A
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Low-melting, lead-free ceramic frits
Assignee: Bayer Corp
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Filing: 1982-04-28
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Granted: 1983-03-08
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Expires: 2002-04-28
Abstract
Abstract A lead-free low-melting frit is made by combining raw materials in amounts such that the product will have a specific oxide analysis, melting the raw materials at a temperature greater than 1000 DEG C. and cooling the thus-formed fused glass in a manner such that a frit is formed. The low-melting frit has the following oxide analysis: 7-12.5 parts by weight alkali oxide selected from 2-9 parts by weight Na2O and 2-7 parts by weight Li2O; 23-34 parts by weight B2O3; 2-4 parts by weight Al2O3; 30-45 parts by weight SiO2; 0.75-4 parts by weight F; 2-4 parts by weight P2O5; 4-8 parts by weight ZnO; and 2-5 parts by weight TiO2. These frits are durable, have an incipient fusion point less than about 450 DEG C. and a coefficient of thermal expansion less than 10x10-6 cm/cm/ DEG C. The frits of the present invention are particularly useful as components in vitrifiable glass decorating colors.
Inventors
- 👤 Richard A. Eppler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:10
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/06; C03C8/04; C03C8/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A lead-free, low-melting frit composition having an incipient fusion point below about 450° C. and a coefficient of thermal expansion less than 10×10 -6 cm/cm/°C., consisting essentially of (in parts by weight based on a total of approximately 100 parts by weight): (a) 7-12.5 parts alkali oxide selected from 2-9 parts Na 2 O and 2-7 parts Li 2 O; (b) 23-34 parts B 2 O 3 ; (c) 2-4 parts Al 2 O 3 ; (d) 30-45 parts SiO 2 ; (e) 0.75-4 parts F; (f) 2-4 parts P 2 O 5 ; (g) 4-8 parts ZnO; and (h) 2-5 parts TiO 2 .
Claim 2
Dependent Claim
105 words
A lead-free, low-melting frit composition having an incipient fusion point below about 450° C. and a coefficient of thermal expansion less than 10×10 -6 cm/cm/°C., consisting essentially of (in parts by weight based on a total of approximately 100 parts by weight): (a) 7-12.5 parts alkali oxide selected from 2-9 parts Na 2 O and 2-7 parts Li 2 O; (b) 23-34 parts B 2 O 3 ; (c) 2-4 parts Al 2 O 3 ; (d) 30-45 parts SiO 2 ; (e) 0.75-4 parts F; (f) 2-4 parts P 2 O 5 ; (g) 4-8 parts ZnO; and (h) 2-5 parts TiO 2 .
Claim 3
Dependent Claim
74 words
The lead-free glass frit composition of claim 1 consisting essentially of: (a) 9-12.5 parts alkali oxide selected from 3-8 parts Na 2 O and 3-7 parts Li 2 O; (b) 23-28 parts B 2 O 3 ; (c) 2.5-4 parts Al 2 O 3 ; (d) 35-45 parts SiO 2 ; (e) 1-3 parts F; (f) 2-3.5 parts P 2 O 5 ; (g) 5-8 parts ZnO; and (h) 3-5 parts TiO 2 .
Claim 4
Dependent Claim
17 words
The lead-free glass frit composition of claim 1 in which 0 to 2 parts MgO are present.
Claim 5
Dependent Claim
17 words
The lead-free glass frit composition of claim 1 in which 0 to 2 parts CaO are present.
Claim 6
Dependent Claim
174 words
A process for the production of a lead-free durable glass frit having an incipient fusion point less than about 450° C. and a coefficient of thermal expansion less than 10×10 -6 cm/cm/°C. comprising: (A) combining batch materials in amounts such that the glass frit will have the following oxide analysis (based on a total of approximately 100 parts by weight): (a) 7-12.5 parts by weight alkali oxide selected from 2-9 parts by weight Na 2 O and 2-7 parts by weight Li 2 O; (b) 23-34 parts by weight B 2 O 3 ; (c) 2-4 parts by weight Al 2 O 3 ; (d) 30-45 parts by weight SiO 2 ; (e) 0.75-4 parts by weight F; (f) 2-4 parts by weight P 2 O 5 ; (g) 4-8 parts by weight ZnO; and (h) 2-5 parts by weight TiO 2 ; (B) melting the batch materials at a temperature greater than 1000° C. (to form fused glass); and (C) cooling the fused glass in a manner such that a frit is formed.
Claim 7
Dependent Claim
174 words
A process for the production of a lead-free durable glass frit having an incipient fusion point less than about 450° C. and a coefficient of thermal expansion less than 10×10 -6 cm/cm/°C. comprising: (A) combining batch materials in amounts such that the glass frit will have the following oxide analysis (based on a total of approximately 100 parts by weight): (a) 7-12.5 parts by weight alkali oxide selected from 2-9 parts by weight Na 2 O and 2-7 parts by weight Li 2 O; (b) 23-34 parts by weight B 2 O 3 ; (c) 2-4 parts by weight Al 2 O 3 ; (d) 30-45 parts by weight SiO 2 ; (e) 0.75-4 parts by weight F; (f) 2-4 parts by weight P 2 O 5 ; (g) 4-8 parts by weight ZnO; and (h) 2-5 parts by weight TiO 2 ; (B) melting the batch materials at a temperature greater than 1000° C. (to form fused glass); and (C) cooling the fused glass in a manner such that a frit is formed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |