US5211764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solder paste and method of using the same
Assignee: Agere Systems LLC
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Filing: 1992-11-10
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Granted: 1993-05-18
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Expires: 2012-11-10
Abstract
Abstract A solder paste that is useful in applications such as surface mounting of components on printed circuit boards has been found. After soldering, the residue requires no cleaning. The achievement of these desirable properties is accomplished by employing a solder flux vehicle including a three component residue modifier.
Inventors
- 👤 Yinon Degani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:10
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
88 words
A process for soldering a multiplicity of components to a substrate, said process comprising the steps of 1) subjecting said components and said substrate to a paste wherein said paste comprises solder particles and a vehicle, and 2) heating said paste to the reflow temperature in an inert environment characterized in that said vehicle comprises an acid, a viscosity modifier, a solvent composition, and a mixture wherein said mixture comprises A) a rosin or a dimerized rosin, B) castor oil, and C) pentaerythritol tetrabenzoate or bis(2-ethyl hexyl) sebacate.
Claim 2
Dependent Claim
88 words
A process for soldering a multiplicity of components to a substrate, said process comprising the steps of 1) subjecting said components and said substrate to a paste wherein said paste comprises solder particles and a vehicle, and 2) heating said paste to the reflow temperature in an inert environment characterized in that said vehicle comprises an acid, a viscosity modifier, a solvent composition, and a mixture wherein said mixture comprises A) a rosin or a dimerized rosin, B) castor oil, and C) pentaerythritol tetrabenzoate or bis(2-ethyl hexyl) sebacate.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said solvent comprises an alcohol and an aromatic compound.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein said solvent comprises di or tripropylene glycol and propyl 4-hydroxy benzoic acid.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein said viscosity modifier comprises a polymer having molecular weight greater than 50,000.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein said polymer comprises ethyl cellulose or ethyl-hydroxy ethyl cellulose.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein said acid comprises a member chosen from the group consisting of diphenic acid, sebacic acid, suberic acid, and 2-phenoxy benzoic acid.
Claim 8
Dependent Claim
18 words
The process of claim 5 wherein said acid constitutes between 1 and 8 wt. % of said vehicle.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein said printing modifier is present in a weight percent of between 1 and 7% of said vehicle.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein said solder paste has a viscosity in the range 700,000 to 1,500,000 centipoise.
Claim 11
Dependent Claim
25 words
The composition of claim 1 wherein each component of said mixture is present in a concentration between 1 and 5 wt. % of said flux.
Claim 12
Dependent Claim
49 words
A solder paste comprising solder particles and a vehicle wherein said vehicle comprises an acid, a viscosity modifier, and a solvent composition characterized in that said vehicle also includes a mixture comprising A) a rosin or dimerized rosin, B) castor oil, and C) pentaerythritol tetrabenzoate or bis(2-ethyl hexyl) sebacate.
Claim 13
Dependent Claim
49 words
A solder paste comprising solder particles and a vehicle wherein said vehicle comprises an acid, a viscosity modifier, and a solvent composition characterized in that said vehicle also includes a mixture comprising A) a rosin or dimerized rosin, B) castor oil, and C) pentaerythritol tetrabenzoate or bis(2-ethyl hexyl) sebacate.
Claim 14
Dependent Claim
15 words
The paste of claim 11 wherein said solvent comprises an alcohol and an aromatic compound.
Claim 15
Dependent Claim
18 words
The paste of claim 12 wherein said solvent comprises di or tripropylene glycol and propyl 4-hydroxy benzoic acid.
Claim 16
Dependent Claim
18 words
The paste of claim 11 wherein said viscosity modifier comprises a polymer having molecular weight greater than 50,000.
Claim 17
Dependent Claim
15 words
The paste of claim 14 wherein said polymer comprises ethyl cellulose or ethyl-hydroxy ethyl cellulose.
Claim 18
Dependent Claim
27 words
The paste of claim 11 wherein said acid comprises a member chosen from the group consisting of diphenic acid, sebacic acid, suberic acid, and 2-phenoxy benzoic acid.
References Cited (Backward Citations)
US3963529A
Cited
US4495007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |