US5035837A
Expired / Lapsed
US
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Copper paste composition
Assignee: Dowa Holdings Co Ltd
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Filing: 1990-06-28
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Granted: 1991-07-30
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Expires: 2010-06-28
Abstract
Abstract A copper paste composition for low temperature firing on a ceramic substrate is comprised of inorganic components and organic vehicle components. The inorganic components mainly consist of cooper powder, cuprous oxide powder, cupric oxide powder and glass powder. The mixing ratio off the inorganic components of this composition is 100 parts by weight of copper powder, about 10 to 15 parts by weight of cuprous oxide powder, about 12 to 17 parts by weight of cupric oxide powder, and about 7 to 12 parts by weight of glass powder. The mixing ratio of the inorganic components with the organic vehicle components is about 95 to 70 parts by weight of the organic vehicle components. Also the the average particle size of the copper powder is in a range of about 0.5 to 3 μm and the oxygen content of the copper powder is about 0.05 to 0.15 weight percent.
Inventors
- 👤 Shuji Saeki
- 👤 Masatoshi Suehiro
- 👤 Masashi Echigo
- 👤 Susumu Okada
- 👤 Masami Sakuraba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:14
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; B; B22; B22F; B22F1/00; B22F1/10; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/636; C04B35/6365; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021; H01; H01B; H01B1/00; H01B1/14; H01B1/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
100 words
A copper paste composition comprising about 95 to about 70 percent by weight of inorganic components and about 5 to about 30 percent by weight of organic vehicle components, said inorganic components comprising a powdered refractory material, and copper powder including cuprous oxide powder and cupric oxide powder in amounts such that about 10 to about 15 parts by weight of cuprous oxide powder, about 12 to about 17 parts by weight of cupric oxide powder, and about 7 to about 12 parts by weight of powdered refractory material, are included for each 100 parts by weight of copper powder.
Claim 2
Dependent Claim
100 words
A copper paste composition comprising about 95 to about 70 percent by weight of inorganic components and about 5 to about 30 percent by weight of organic vehicle components, said inorganic components comprising a powdered refractory material, and copper powder including cuprous oxide powder and cupric oxide powder in amounts such that about 10 to about 15 parts by weight of cuprous oxide powder, about 12 to about 17 parts by weight of cupric oxide powder, and about 7 to about 12 parts by weight of powdered refractory material, are included for each 100 parts by weight of copper powder.
Claim 3
Dependent Claim
36 words
The copper paste composition of claim 1 wherein said copper powder has a mean particle size of about 0.5 to about 3 μm and an oxygen content between about 0.05 and about 0.15 percent by weight.
Claim 4
Dependent Claim
24 words
The copper paste composition of claim 2 wherein said cuprous oxide powder has a particle size range from about 0.5 to about 5 μm.
Claim 5
Dependent Claim
24 words
The copper paste composition of claim 3 wherein said cuprous oxide powder has a particle size range from about 0.5 to about 2 μm.
Claim 6
Dependent Claim
18 words
The copper paste composition of claim 2 wherein said organic vehicle components include a solvent and a resin.
Claim 7
Dependent Claim
27 words
The copper paste composition of claim 5 wherein said solvent is selected from the group consisting of terpineol, C 10 to C 18 alcohols, and mixtures thereof.
Claim 8
Dependent Claim
28 words
The copper paste composition of claim 5 wherein said resin is selected from the group consisting of cellulosic resins, acrylic resins, methacrylic resins, terpene resins and mixtures thereof.
Claim 9
Dependent Claim
22 words
The copper paste composition of claim 5 wherein said organic vehicle components include about 10 percent or less by weight of resin.
Claim 10
Dependent Claim
29 words
The copper paste composition of claim 2 further comprising about 5 parts or less by weight of an inorganic oxide per 100 parts by weight of said copper powder.
Claim 11
Dependent Claim
27 words
The copper paste composition of claim 9 wherein said inorganic oxide is selected from the group consisting of vanadium oxide, lead oxide, antimony oxide and mixtures thereof.
Claim 12
Dependent Claim
16 words
The copper paste composition of claim 5 wherein said organic vehicle components further include a plasticizer.
Claim 13
Dependent Claim
13 words
The copper paste composition of claim 11 wherein said plasticizer is dibutyl phthalate.
Claim 14
Dependent Claim
14 words
The copper paste composition of claim 1 wherein said powdered refractory material is glass.
Claim 15
Dependent Claim
24 words
The copper paste composition of claim 13 wherein said glass powder has a softening point of between about 300° C. and about 600° C.
Claim 16
Dependent Claim
73 words
A copper paste composition for low temperature firing comprised of copper powder with an oxygen content between about 0.05 to 0.15 weight percent, cuprous oxide powder, cupric oxide powder, and organic vehicle components in amounts such that about 10 to about 15 parts by weight of cuprous oxide powder and about 12 to about 17 parts by weight of cupric oxide powder are included for each 100 parts by weight of copper powder.
Claim 17
Dependent Claim
73 words
A copper paste composition for low temperature firing comprised of copper powder with an oxygen content between about 0.05 to 0.15 weight percent, cuprous oxide powder, cupric oxide powder, and organic vehicle components in amounts such that about 10 to about 15 parts by weight of cuprous oxide powder and about 12 to about 17 parts by weight of cupric oxide powder are included for each 100 parts by weight of copper powder.
Claim 18
Dependent Claim
112 words
In a copper paste composition for low temperature firing wherein copper powder is blended into a paste including a binder, a solvent and a powdered refractory material, the paste is applied to a substrate and fired at a temperature sufficient to remove the solvent and the binder from the copper powder and the powdered refractory material and to adhere the copper powder, bound in the refractory material adhered to the substrate, the improvement comprising the copper powder including about 10 to about 15 parts by weight of cuprous oxide powder and about 12 to about 17 parts by weight of cupric oxide powder for each 100 parts by weight of copper powder.
Claim 19
Dependent Claim
112 words
In a copper paste composition for low temperature firing wherein copper powder is blended into a paste including a binder, a solvent and a powdered refractory material, the paste is applied to a substrate and fired at a temperature sufficient to remove the solvent and the binder from the copper powder and the powdered refractory material and to adhere the copper powder, bound in the refractory material adhered to the substrate, the improvement comprising the copper powder including about 10 to about 15 parts by weight of cuprous oxide powder and about 12 to about 17 parts by weight of cupric oxide powder for each 100 parts by weight of copper powder.
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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) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |