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US4446241A
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Lead-free and cadmium-free glass frit compositions for glazing, enameling and decorating
Assignee: Libbey Glass Inc
•
Filing: 1982-06-28
•
Granted: 1984-05-01
•
Expires: 2002-06-28
Abstract
Abstract Glass frits for use in glazes or enamels have fiber softening point about 535°-609° C. are free of lead, cadmium and zinc and consist essentially of Li 2 O-B 2 O 3 -SiO 3 plus 2-23% SnO 2 +CaO and 2-23% ZrO 2 +La 2 O 3 ; also, Al 2 O 3 , SrO, BaO, Na 2 O, F. Low expansion filler, e.g., B-eucryptite, may be used at 4 to 15% by weight of glass frit.
Inventors
- 👤 Josef Francel
- 👤 Daniel R. Stewart
- 👤 Uriah Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:53
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
109 words
A lead-free, cadmium-free and zinc-free glass frit composition having a fiber softening point of about 535° C. to about 609° C. consisting essentially of the following components present in the indicated approximate weight percent ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
Al.sub.2 O.sub.3
0-30
B.sub.2 O.sub.3
16-32
SiO.sub.2 11-40
Li.sub.2 O 4-12
ZrO.sub.2 0-18
SnO.sub.2 0-20
CeO.sub.2 0-2
La.sub.2 O.sub.3
0-15
CaO 0-16
SrO 0-13
BaO 0-7
Na.sub.2 O 0-3.5
F 0-2.6
______________________________________ and wherein ______________________________________
Σ SnO.sub.2 + CaO
is 2-23
Σ ZrO.sub.2 + La.sub.2 O.sub.3
is 2-33
Σ ZrO.sub.2 + Al.sub.2 O.sub.3
is 0-26.5
Σ CaO + SrO + BaO
is 0-19.25
______________________________________
Claim 2
Dependent Claim
109 words
A lead-free, cadmium-free and zinc-free glass frit composition having a fiber softening point of about 535° C. to about 609° C. consisting essentially of the following components present in the indicated approximate weight percent ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
Al.sub.2 O.sub.3
0-30
B.sub.2 O.sub.3
16-32
SiO.sub.2 11-40
Li.sub.2 O 4-12
ZrO.sub.2 0-18
SnO.sub.2 0-20
CeO.sub.2 0-2
La.sub.2 O.sub.3
0-15
CaO 0-16
SrO 0-13
BaO 0-7
Na.sub.2 O 0-3.5
F 0-2.6
______________________________________ and wherein ______________________________________
Σ SnO.sub.2 + CaO
is 2-23
Σ ZrO.sub.2 + La.sub.2 O.sub.3
is 2-33
Σ ZrO.sub.2 + Al.sub.2 O.sub.3
is 0-26.5
Σ CaO + SrO + BaO
is 0-19.25
______________________________________
Claim 3
Dependent Claim
61 words
The glass frit composition according to claim 1 and consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Composition Weight Percent
______________________________________
Al.sub.2 O.sub.3
19-20
B.sub.2 O.sub.3
28-30
SiO.sub.2 11-16
LiO.sub.2 4-8
ZrO.sub.2 4-7.5
SnO.sub.2 6-19
La.sub.2 O.sub.3
0-0.5
CaO 0-4
SrO 0-13
BaO 0-7
Na.sub.2 O 0-0.25
F 0-1.5
______________________________________
Claim 4
Dependent Claim
103 words
The glass frit composition according to claim 1 and consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
Al.sub.2 O.sub.3
15-30
B.sub.2 O.sub.3
16-32
Li.sub.2 O 4-12
SiO.sub.2 11-40
ZrO.sub.2 3-6.5
SnO.sub.2 0-20
CeO.sub.2 0-2
La.sub.2 O.sub.3
0-6
CaO 0-16
SrO 0-13
BaO 0-7
Na.sub.2 O 0-3.5
F 0-3
______________________________________ wherein ______________________________________
Σ SnO.sub.2 + CaO
is 9 to 23%
Σ ZrO.sub.2 + La.sub.2 O.sub.3
is 3 to 7%
Σ ZrO.sub.2 + Al.sub.2 O.sub.3
is 23 to 26.5%
Σ CaO + SrO + BaO
is 7 to 19.25%
______________________________________
Claim 5
Dependent Claim
104 words
The glass frit composition according to claim 1 and consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Composition Weight Percent
______________________________________
Al.sub.2 O.sub.3
15-30
B.sub.2 O.sub.3
16-32
Li.sub.2 O 4-12
SiO.sub.2 11-40
ZrO.sub.2 4-6.5
SnO.sub.2 0-20
CeO.sub.2 0-2
La.sub.2 O.sub.3
0-6
CaO 0-16
SrO 0-13
BaO 0-7
Na.sub.2 O 0-3
F 0-1.5
______________________________________ wherein generally: ______________________________________
Σ SnO.sub.2 + CaO
is 10 to 23%
Σ ZrO.sub.2 + La.sub.2 O.sub.3
is 4 to 6.5%
Σ ZrO.sub.2 + Al.sub.2 O.sub.3
is 24 to 26.5%
Σ CaO + SrO + BaO
is 7 to 19.25%
______________________________________
Claim 6
Dependent Claim
89 words
The glass frit composition according to claim 1 and consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
Al.sub.2 O.sub.3
0-2
B.sub.2 O.sub.3
24-32
Li.sub.2 O 5-9
SiO.sub.2 16-40
ZrO.sub.2 0-18
SnO.sub.2 0-10
La.sub.2 O.sub.3
13-15
CaO 0-10
SrO 0-3
Na.sub.2 O 0-3
______________________________________ wherein ______________________________________
Σ SnO.sub.2 + CaO
is 2-10%
Σ ZrO.sub.2 + La.sub.2 O.sub.3
is 15-33%
Σ ZrO.sub.2 + Al.sub.2 O.sub.3
is 0-18%
Σ CaO + SrO + BaO
is 0-10%
______________________________________
Claim 7
Dependent Claim
77 words
The glass frit composition according to claim 1 and consisting essentially of the following components present in the indicated weight ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
B.sub.2 O.sub.3
24-30
Li.sub.2 O 5-9
SiO.sub.2 28-40
ZrO.sub.2 3-18
SnO.sub.2 0-2
La.sub.2 O.sub.3
13-15
CaO 0-9
Na.sub.2 O 0-3
______________________________________ and wherein: ______________________________________
Σ SnO.sub.2 + CaO
is 2-9%
Σ ZrO.sub.2 + La.sub.2 O.sub.3
is 17-33%
Σ CaO + SrO + BaO
is 0-9%
______________________________________
Claim 8
Dependent Claim
59 words
The glass frit composition according to claim 1 consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
Al.sub.2 O.sub.3
19.7
B.sub.2 O.sub.3
28.25
Li.sub.2 O 7.50
SiO.sub.2 12.75
ZrO.sub.2 6.10
SnO.sub.2 14.22
La.sub.2 O.sub.3
0.5
CaO 4
BaO 5.25
Na.sub.2 O 0.8
F 0.93
______________________________________
Claim 9
Dependent Claim
53 words
The glass frit composition according to claim 1 consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
Al.sub.2 O.sub.3
20
B.sub.2 O.sub.3
28
Li.sub.2 O 8
SiO.sub.2 14
ZrO.sub.2 6.5
SnO.sub.2 15
CaO 3
SrO 4
F 1.5
______________________________________
Claim 10
Dependent Claim
51 words
The glass frit composition according to claim 1 consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Composition Weight Percent
______________________________________
Al.sub.2 O.sub.3
20
B.sub.2 O.sub.3
28
Li.sub.2 O 8
SiO.sub.2 11
ZrO.sub.2 6.5
SnO.sub.2 19
BaO 7
F 0.5
______________________________________
Claim 11
Dependent Claim
53 words
The glass frit composition according to claim 1 consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
Al.sub.2 O.sub.3
20
B.sub.2 O.sub.3
30
Li.sub.2 O 4
SiO.sub.2 15
ZrO.sub.2 4
SnO.sub.2 6
CaO 4
SrO 13
BaO 4
______________________________________
Claim 12
Dependent Claim
53 words
The glass frit composition according to claim 1 consisting essentially of the following components present in the indicated weight percent ranges based on the total composition: ______________________________________
Component Weight Percent
______________________________________
Al.sub.2 O.sub.3
20
B.sub.2 O.sub.3
29
Li.sub.2 O 6
SiO.sub.2 16
ZrO.sub.2 5
SnO.sub.2 7
CaO 3
SrO 11
BaO 3
______________________________________
Claim 13
Dependent Claim
37 words
A colored enamel for decorating glass, glass-ceramic and ceramic ware comprising frit as defined in claim 1 and from 4% to 15% of a low expansion filler or pigment, based on the weight of the glass frit.
Claim 14
Dependent Claim
13 words
The colored enamel of claim 12, wherein the filler is low expansion β-eucryptite.
Claim 15
Dependent Claim
36 words
A method of reducing stress in decorating compositions for application to glass, glass-ceramic and ceramic ware comprising incorporating from 5 to 15% of a low expansion filler into a glass frit as defined in claim 1.
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |