US4092182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soldering flux composition
Assignee: Multicore Solders Ltd
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Filing: 1977-05-10
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Granted: 1978-05-30
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Expires: 1997-05-10
Abstract
Abstract A flux composition of the non-corrosive type suitable for use in soft soldering, particularly in the electrical and electronics industries, contains in place of the conventional natural rosin (colophony), an ester of a polyhydric alcohol such as pentaerythritol tetrabenzoate. The composition can be in solid or liquid form and in the latter can perform the multiple functions of an etch resist, a protective coating and a flux in the production of printed circuit assemblies.
Inventors
- 👤 Gordon Francis Arbib
- 👤 Wallace Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:14
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3489; B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612; B23K35/3618
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
A flux composition, comprising, as essential constituents: (1) at least one ester derived from a polyhydric alcohol and at least one saturated or unsaturated fatty acid or mononuclear aromatic acid; and (2) at least one additional constituent selected from: (a) organic acids which are substantially soluble in said ester of a polyhydric alcohol when in a molten condition; (b) flux activating agents; and (c) flux residue hardening agents, said ester being present in an amount of at least 25% by weight based on the total weight of constituents (1) and (2).
Claim 2
Dependent Claim
91 words
A flux composition, comprising, as essential constituents: (1) at least one ester derived from a polyhydric alcohol and at least one saturated or unsaturated fatty acid or mononuclear aromatic acid; and (2) at least one additional constituent selected from: (a) organic acids which are substantially soluble in said ester of a polyhydric alcohol when in a molten condition; (b) flux activating agents; and (c) flux residue hardening agents, said ester being present in an amount of at least 25% by weight based on the total weight of constituents (1) and (2).
Claim 3
Dependent Claim
29 words
A composition as claimed in claim 1 in the form of a solid, the composition containing at least 80% by weight, based on the total composition, of said ester.
Claim 4
Dependent Claim
46 words
A composition as claimed in claim 1 in the form of a liquid, comprising constituents (1) and (2) dissolved in an organic solvent, the liquid composition containing at least 40% by weight of said ester (1), based on the total weight of constituents (1) and (2).
Claim 5
Dependent Claim
32 words
A composition as claimed in claim 1, wherein said constituent (1) is an ester having a molecular weight in the range from 300 to 3000 and which is solid at room temperature.
Claim 6
Dependent Claim
26 words
A composition as claimed in claim 1, wherein said constituent (1) is an ester derived from a polyhydric alcohol containing from 2 to 8 hydroxyl groups.
Claim 7
Dependent Claim
13 words
A composition as claimed in claim 5, wherein said ester is pentaerythritol tetrabenzoate.
Claim 8
Dependent Claim
26 words
A composition as claimed in claim 1, wherein said organic acid (a) is present in an amount not exceeding 20% by weight of the total composition.
Claim 9
Dependent Claim
27 words
A composition as claimed in claim 1, wherein said flux activating agent (b) is present in an amount not exceeding 20% by weight of the total composition.
Claim 10
Dependent Claim
27 words
A composition as claimed in claim 1, wherein said flux residue hardening agent is present in an amount not exceeding 20% by weight of the total composition.
Claim 11
Dependent Claim
27 words
A fluxed solder composition for use in soft soldering, the composition comprising in association a soft solder alloy and a flux composition as claimed in claim 1.
Claim 12
Dependent Claim
98 words
A method of producing a printed circuit board, which comprises the steps of: (a) applying to a copper coated plastics laminate board a flux composition as claimed in claim 3 so as to form thereon a pattern in which copper circuit conductors are required to be formed; (b) subjecting the resulting board to the action of an etch solution so as to remove all the copper coating in those areas outside the patterned areas; and (c) washing and thereafter drying the resulting etched board bearing the required copper circuit conductors still having a coating of said flux composition.
Claim 13
Dependent Claim
149 words
A method of producing a printed circuit assembly, which comprises the steps of: (a) applying to a copper coated plastics laminate board a flux composition as claimed in claim 3 so as to form thereon a pattern in which copper circuit conductors are required to be formed; (b) subjecting the resulting board to the action of an etch solution so as to remove all the copper coating in those areas outside the patterned areas; (c) washing and thereafter drying the resulting etched board bearing the required copper circuit conductors still having a coating of said flux composition; (d) mounting on the printed circuit board so formed a plurality of electronic components by passing the component lead wires through holes formed in the board; and (e) thereafter joining the lead wires to the appropriate copper circuit conductors by soldering with a soft solder alloy without a separate application of flux.
Claim 14
Dependent Claim
15 words
A flux composition in accordance with claim 1, wherein said aromatic acid is benzoic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |