US4240945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solder mask composition
Assignee: American Organics Corp
•
Filing: 1979-01-31
•
Granted: 1980-12-23
•
Expires: 1999-01-31
Abstract
Abstract There is disclosed a composition useful as a solder mask coating for use in the manufacture of printed circuit boards and the like which comprises a mixture of an alkyd resin and an alkylated amino resin, a minor quantity of a hydrocarbon resin, an inorganic filler derived from sedimentary shale of a particular origin, and sufficient organic solvent to provide a working viscosity suitable for silk-screening applications. The invention comprises also the use of a preferred and particular inorganic filler known as Panamint Earth.
Inventors
- 👤 Albert Gabrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:56
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/285; B; B23; B23K; B23K35/00; B23K35/22; B23K35/224; C; C08; C08K; C08K3/00; C08K3/01; C08L; C08L61/00; C08L67/00; C08L67/08; C09; C09D; C09D167/00; C09D167/08; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0166; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S524/00; Y10S524/904
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
170 words
A composition useful as a solder masking coating which consists essentially of: (a) a film former comprising: (1) from 25 to about 40 weight percent of an alkyd resin of a polyester prepolymer extended with from about 25 to about 70 weight percent fatty acid; (2) from 18 to about 27 weight percent of an alkylated amino resin selected from the class consisting of methylol-melamine and methylol-urea condensates etherified with alkanols of 1 to about 6 carbons; (3) from 30 to about 45 weight percent Panamint earth having a particle size passing a screen size from 20 to 325 mesh, and weight contents of from 21 to 35 percent silicon, 15 to 28 percent aluminum, 2 to 3 percent calcium, and 1 to 2 percent iron, and a porosity of 45 percent; and (4) from 2 to about 5 weight percent of a hydrocarbon polymer having a melting point no greater than about 150° C.; and (b) sufficient organic solvent to provide a viscosity no greater than about 9,000 centipoises.
Claim 2
Dependent Claim
170 words
A composition useful as a solder masking coating which consists essentially of: (a) a film former comprising: (1) from 25 to about 40 weight percent of an alkyd resin of a polyester prepolymer extended with from about 25 to about 70 weight percent fatty acid; (2) from 18 to about 27 weight percent of an alkylated amino resin selected from the class consisting of methylol-melamine and methylol-urea condensates etherified with alkanols of 1 to about 6 carbons; (3) from 30 to about 45 weight percent Panamint earth having a particle size passing a screen size from 20 to 325 mesh, and weight contents of from 21 to 35 percent silicon, 15 to 28 percent aluminum, 2 to 3 percent calcium, and 1 to 2 percent iron, and a porosity of 45 percent; and (4) from 2 to about 5 weight percent of a hydrocarbon polymer having a melting point no greater than about 150° C.; and (b) sufficient organic solvent to provide a viscosity no greater than about 9,000 centipoises.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein said alkyd resin is present at a concentration from 30 to 36 weight percent.
Claim 4
Dependent Claim
21 words
The composition of claim 1 wherein said alkylated amino resin is present at a concentration from 20 to 25 weight percent.
Claim 5
Dependent Claim
21 words
The composition of claim 1 wherein said Panamint earth filler is present at a concentration of 34 to 43 weight percent.
Claim 6
Dependent Claim
20 words
The composition of claim 1 wherein said hydrocarbon polymer is present at a concentration from 2.8 to 3.5 weight percent.
Claim 7
Dependent Claim
19 words
The composition of claim 1 wherein said Panamint earth filler has a size range from 2 to 250 microns.
Claim 8
Dependent Claim
24 words
The composition of claim 1 wherein said alkyd resin is a short to medium chain alkyl containing up to about 60 percent fatty acid.
Claim 9
Dependent Claim
24 words
The composition of claim 1 wherein said alkyl resin is a long chain alkyl containing from 60 to about 70 weight percent fatty acid.
Claim 10
Dependent Claim
15 words
The composition of claim 1 wherein said alkylated amino resin is an alkylated methylol-melamine resin.
Claim 11
Dependent Claim
13 words
The composition of claim 9 wherein said amino resin is etherified with methanol.
Claim 12
Dependent Claim
13 words
The composition of claim 9 wherein said amino resin is etherified with isobutanol.
Claim 13
Dependent Claim
13 words
The composition of claim 9 wherein said amino resin is etherified with butanol.
Claim 14
Dependent Claim
17 words
The composition of claim 1 wherein said hydrocarbon polymer has a molecular weight of 1500 to 2000.
Claim 15
Dependent Claim
17 words
The composition of claim 1 wherein said hydrocarbon polymer has a molecular weight of 1500 to 3000.
Claim 16
Dependent Claim
13 words
The composition of claim 1 wherein said hydrocarbon polymer is a beta-pinene resin.
Claim 17
Dependent Claim
18 words
The composition of claim 1 wherein said hydrocarbon polymer has a melting point between 140° and 150° F.
Claim 18
Dependent Claim
13 words
The composition of claim 1 wherein said solvent comprises an ethylene glycol ether.
Claim 19
Dependent Claim
21 words
The composition of claim 16 wherein said solvent is an ethylene glycol mono (C 1 -C 6 ) alkyl ether acetate.
Claim 20
Dependent Claim
17 words
The composition of claim 18 wherein said solvent includes an aromatic boiling between 300° and 425° F.
References Cited (Backward Citations)
US3365321A
Cited
US3874949A
Cited
US4064287A
Cited
US4038225A
Cited
US4025474A
Cited
US4119596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |