US4557767A
Expired / Lapsed
US
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Fusible powdered metal paste
Assignee: SCM Metal Products Inc
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Filing: 1984-09-11
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Granted: 1985-12-10
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Expires: 2004-09-11
Abstract
Abstract There is provided an inorganic salt-free, anhydrous, noncorrosive powdered solder metal paste and vehicle therefor which vehicle is characterized by the presence therein of a flux and a nonaqueous organic liquid having a surface tension or surface energy of from 43 to 65 dynes/cm. and higher at 20° C. When powdered solder metal or powdered solder metal alloy is distributed in such a vehicle in an amount sufficient to form a paste, a deposit will not undergo hot slump at elevated temperatures. The pastes and vehicles are free of inorganic metal salts.
Inventors
- 👤 Jennie S. Hwang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:59
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36
Claims Analysis
Total Claims: 61
Claim 1
Independent Claim
76 words
A nonaqueous noncorrosive inorganic salt free powdered metal soft solder paste composition containing from 75% to 95% by weight of a powdered soft solder metal or powdered soft solder metal alloy having an average particle size finer than 100 mesh (U.S. Standard Sieve Size) and from 5% to 25% by weight of a nonaqueous organic liquid having a surface tension of from 43 to 65 or more dynes/cm. at 20° C., and a noncorrosive anhydrous flux.
Claim 2
Dependent Claim
76 words
A nonaqueous noncorrosive inorganic salt free powdered metal soft solder paste composition containing from 75% to 95% by weight of a powdered soft solder metal or powdered soft solder metal alloy having an average particle size finer than 100 mesh (U.S. Standard Sieve Size) and from 5% to 25% by weight of a nonaqueous organic liquid having a surface tension of from 43 to 65 or more dynes/cm. at 20° C., and a noncorrosive anhydrous flux.
Claim 3
Dependent Claim
65 words
An improved essentially nonaqueous noncorrosive inorganic saltfree paste vehicle for soft solder metal powder, said vehicle comprising petrolatum in which is dispersed in a proportion effective for diminishing hot slump of said metal powder when it is compounded with said vehicle, a nonaqueous organic liquid, having a surface tension of from 43 to 65 or higher dynes/cm. at 20° C., and a noncorrosive anhydrous flux.
Claim 4
Dependent Claim
65 words
An improved essentially nonaqueous noncorrosive inorganic saltfree paste vehicle for soft solder metal powder, said vehicle comprising petrolatum in which is dispersed in a proportion effective for diminishing hot slump of said metal powder when it is compounded with said vehicle, a nonaqueous organic liquid, having a surface tension of from 43 to 65 or higher dynes/cm. at 20° C., and a noncorrosive anhydrous flux.
Claim 5
Dependent Claim
71 words
An improved essentially nonaqueous noncorrosive inorganic salt free paste vehicle for soft solder metal powder, said vehicle comprising petrolatum in which is dispersed in a proportion effective for diminishing hot slump of said metal powder when it is compounded with said vehicle, a base dispersed in a liquid polyol said polyol having a surface tension of from 43 to 65 or higher dynes/cm. at 20° C., and a noncorrosive anhydrous flux.
Claim 6
Dependent Claim
71 words
An improved essentially nonaqueous noncorrosive inorganic salt free paste vehicle for soft solder metal powder, said vehicle comprising petrolatum in which is dispersed in a proportion effective for diminishing hot slump of said metal powder when it is compounded with said vehicle, a base dispersed in a liquid polyol said polyol having a surface tension of from 43 to 65 or higher dynes/cm. at 20° C., and a noncorrosive anhydrous flux.
Claim 7
Dependent Claim
24 words
A nonaqueous noncorrosive inorganic salt free powdered soft solder metal paste composition in accordance with claim 1 wherein the nonaqueous organic liquid is triethanolamine.
Claim 8
Dependent Claim
24 words
An nonaqueous noncorrosive inorganic salt free powdered soft solder metal paste composition in accordance with claim 1 wherein the nonaqueous organic liquid is diethanolamine.
Claim 9
Dependent Claim
22 words
The vehicle of claim 3 in which said base is an amino alcohol in a proportion between about 2% and about 40%.
Claim 10
Dependent Claim
22 words
The vehicle of claim 6 in which said base is an amino alkane in a proportion between about 2% and about 40%.
Claim 11
Dependent Claim
21 words
The vehicle of claim 3 in which the base is sodium hydroxide in a proportion between about 0.05% and about 5%.
Claim 12
Dependent Claim
31 words
The paste of claim 1 comprising from about 75-95 parts of powdered tin-containing solder which melts below 330° C. and has a particle size not substantially larger than about 100 mesh.
Claim 13
Dependent Claim
41 words
The vehicle of claim 1 which consists essentially of petrolatum, an base and a polyol having a surface tension of from 43 to 65 or more dynes/cm. at 20° C. and is further characterized by the presence therein of a surfactant.
Claim 14
Dependent Claim
44 words
The vehicle of claim 1 which consists essentially of petrolatum, an alkali metal hydroxide and a polyol having a surface tension of from 43 to 65 or more dynes/cm. at 20° C. and is further characterized by the presence therein of plasticizer or diluent.
Claim 15
Dependent Claim
17 words
The vehicle of claim 11 wherein at least a portion of said diluent is practically water insoluble.
Claim 16
Dependent Claim
12 words
The vehicle of claim 12 wherein said diluent comprises a phthalate ester.
Claim 17
Dependent Claim
11 words
The vehicle of claim 13 wherein said ester is dibutyl phthalate.
Claim 18
Dependent Claim
12 words
The vehicle of claim 11 wherein said diluent comprises a terpene alcohol.
Claim 19
Dependent Claim
25 words
The vehicle of claim 3 compounded for use with soft solder powder wherein said base is an amine and the vehicle also contains carboxylic acid.
Claim 20
Dependent Claim
11 words
The vehicle of claim 16 wherein said carboxylic acid is polycyclic.
Claim 21
Dependent Claim
12 words
The vehicle of claim 17 wherein said carboxylic acid is cholic acid.
Claim 22
Dependent Claim
13 words
The vehicle of claim 17 wherein said carboxylic acid is a rosin acid.
Claim 23
Dependent Claim
13 words
The vehicle of claim 19 wherein said rosin acid is principally abietic acid.
Claim 24
Dependent Claim
13 words
The vehicle of claim 20 wherein said amine comprises a water soluble alkanolamine.
Claim 25
Dependent Claim
10 words
The vehicle of claim 21 wherein said alkanolamine is triethanolamine.
Claim 26
Dependent Claim
31 words
The vehicle of claim 16 wherein said alkali comprises triethanolamine, said carboxylic acid is cholic acid, and the vehicle is further characterized by the presence of surfactant and di-n-butyl phthalate diluent.
Claim 27
Dependent Claim
11 words
The vehicle of claim 2 wherein said liquid polyol comprises glycerine.
Claim 28
Dependent Claim
134 words
A nonaqueous noncorrosive inorganic salt free soft solder paste characterized by resistance to slumping during heating to the solder fusion point comprising: (a) from 75 to 95 weight parts per 100 parts of paste composition of a soft solder metal powder composition having a particle size of from -200 to +400 mesh (U.S. Standard Screen), (b) from 25 to 5 weight parts heat liquefiable hydrocarbon ranging from semi-solid at room temperature to fugitive from the metal powder at the fusion temperature thereof, (c) a nonaqueous organic liquid having a surface tension of from 44 to 65 dynes/cm. at 20° C. dispersed in said hydrocarbon, and, (d) an amount of a noncorrosive flux for said soft solder sufficient to form a shiny and coherent residue of solder upon melting and solidifying said powdered soft solder.
Claim 29
Dependent Claim
134 words
A nonaqueous noncorrosive inorganic salt free soft solder paste characterized by resistance to slumping during heating to the solder fusion point comprising: (a) from 75 to 95 weight parts per 100 parts of paste composition of a soft solder metal powder composition having a particle size of from -200 to +400 mesh (U.S. Standard Screen), (b) from 25 to 5 weight parts heat liquefiable hydrocarbon ranging from semi-solid at room temperature to fugitive from the metal powder at the fusion temperature thereof, (c) a nonaqueous organic liquid having a surface tension of from 44 to 65 dynes/cm. at 20° C. dispersed in said hydrocarbon, and, (d) an amount of a noncorrosive flux for said soft solder sufficient to form a shiny and coherent residue of solder upon melting and solidifying said powdered soft solder.
Claim 30
Dependent Claim
22 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 25 wherein the flux is a basic reacting flux.
Claim 31
Dependent Claim
22 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 26 wherein the basic reacting flux is an amine.
Claim 32
Dependent Claim
41 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 27 wherein the amine is a trailkylamine in which the alkyl group is selected from the same or different alkyl groups containing from 2 to 6 carbon atoms.
Claim 33
Dependent Claim
20 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 28 in which the trialkylamine is triethylamine.
Claim 34
Dependent Claim
28 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 25 in which the flux is an alkali metal hydroxide or an alkali metal alcoholate.
Claim 35
Dependent Claim
28 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 30 in which the alkali metal hydroxide is dissolved in or reacted with the polyol.
Claim 36
Dependent Claim
23 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 30 in which the alkali metal hydroxide is sodium hydroxide.
Claim 37
Dependent Claim
32 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 25 in which the nonaqueous organic liquid is a polyhydric alcohol containing only the elements C, H, and O.
Claim 38
Dependent Claim
21 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 33 in which the polyhydric alcohol is glycerine.
Claim 39
Dependent Claim
24 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 34 wherein the flux is an alkali metal hydroxide or alcoholate.
Claim 40
Dependent Claim
33 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 25 said paste being further characterized by the presence therein of from 0.5% to 10% by weight of an alkanolamine.
Claim 41
Dependent Claim
19 words
A nonaqueous noncorrosive inorganic salt free soft solder paste as defined in claim 36 wherein the alkanolamine is triethanolamine.
Claim 42
Dependent Claim
21 words
The composition of claim 30 in which the alkali is sodium hydroxide in a proportion between about 0.05% and about 5%.
Claim 43
Dependent Claim
30 words
The paste of claim 25 comprising from about 75-95 par1/2ts of powdered tin-containing solder which melts below 330° C. and has particle size not substantially larger than about 100 mesh.
Claim 44
Dependent Claim
22 words
The paste of claim 31 which consists essentially of petrolatum and said alkali and is characterized by the presence therein of surfactant.
Claim 45
Dependent Claim
25 words
The paste of claim 31 which consists essentially of petrolatum and said alkali and is characterized by the presence therein of plasticizer or solvent diluent.
Claim 46
Dependent Claim
16 words
The paste of claim 41 wherein at least a portion of said diluent is water insoluble.
Claim 47
Dependent Claim
12 words
The paste of claim 42 wherein said diluent comprises a phthalate ester.
Claim 48
Dependent Claim
11 words
The paste of claim 43 wherein said ester is dibutyl phthalate.
Claim 49
Dependent Claim
12 words
The paste of claim 41 wherein said diluent comprises a terpene alcohol.
Claim 50
Dependent Claim
17 words
The paste of claim 25 which is further characterized by the presence therein of a carboxylic acid.
Claim 51
Dependent Claim
11 words
The paste of claim 46 wherein said carboxylic acid is polycyclic.
Claim 52
Dependent Claim
12 words
The paste of claim 46 wherein said carboxylic acid is cholic acid.
Claim 53
Dependent Claim
13 words
The paste of claim 46 wherein said carboxylic acid is a resin acid.
Claim 54
Dependent Claim
13 words
The paste of claim 46 wherein said resin acid is principally abietic acid.
Claim 55
Dependent Claim
15 words
The paste of claim 40 which is further characterized by the presence of an alkanolamine.
Claim 56
Dependent Claim
10 words
The paste of claim 51 wherein said alkanolamine is triethanolamine.
Claim 57
Dependent Claim
34 words
The paste of claim 39 wherein said alkali comprises sodium hydroxide and glycerine, said carboxylic acid is cholic acid, and the vehicle is further characterized by the presence of surfactant and di-n-butyl phthalate diluent.
Claim 58
Dependent Claim
10 words
The paste of claim 25 wherein said polyol is glycerine.
Claim 59
Dependent Claim
19 words
The paste of claim 25 wherein the flux/nonaqueous organic liquid system is 7% sodium hydroxide dissolved in 93% glycerine.
Claim 60
Dependent Claim
10 words
The paste of claim 51 wherein the alkanolamine is monoethanolamine.
Claim 61
Dependent Claim
25 words
The paste of claim 25 wherein the hydrocarbon is a hydrogenated polymeric hydrocarbon having a softening point in the range of 15° to 130° C.
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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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |