US4142416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxylic acid composition for forming thermoparticulating coating
Assignee: Westinghouse Electric Corp
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Filing: 1977-11-25
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Granted: 1979-03-06
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Expires: 1997-11-25
Abstract
Abstract A composition is disclosed of a carboxylic acid, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the carboxylic acid in the coating forms particles in the gas stream which are detected by the monitor.
Inventors
- 👤 James D. B. Smith
- 👤 David C. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:39
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/24; C; C09; C09D; C09D5/00; C09D5/26; G; G01; G01K; G01K11/00; H02H; H02H5/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
139 words
A room temperature, air-dryable coating composition comprising at least one thermoparticulating carboxylic acid and a solution in an organic solvent of a room temperature, air-dryable polyester or epoxy resinous carrier which is and substantially unreactive with said carboxylic acid and stable when cured, said carboxylic acid having the general formula HOOCR, where R is ##STR15## or --CHR"R' where R' is alkyl to C 24 or carboxyalkyl to C 24 , R" is H or OH, and where each X is independently selected from the group consisting of halogen, nitro, alkyl to C 5 , carboxy, and amino, and n is 1 to 5 wherein the amount of said carboxylic acid is about 20 to about 250 phr and the amount of the solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 2
Dependent Claim
139 words
A room temperature, air-dryable coating composition comprising at least one thermoparticulating carboxylic acid and a solution in an organic solvent of a room temperature, air-dryable polyester or epoxy resinous carrier which is and substantially unreactive with said carboxylic acid and stable when cured, said carboxylic acid having the general formula HOOCR, where R is ##STR15## or --CHR"R' where R' is alkyl to C 24 or carboxyalkyl to C 24 , R" is H or OH, and where each X is independently selected from the group consisting of halogen, nitro, alkyl to C 5 , carboxy, and amino, and n is 1 to 5 wherein the amount of said carboxylic acid is about 20 to about 250 phr and the amount of the solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 3
Dependent Claim
10 words
A composition according to claim 1 wherein R is CHR"R'.
Claim 4
Dependent Claim
20 words
A composition according to claim 2 wherein R' is carboxyalkyl from C 2 to C 18 and R" is hydrogen.
Claim 5
Dependent Claim
19 words
A composition according to claim 1 wherein X is halogen, nitro, or a mixture thereof, and n is 1.
Claim 6
Dependent Claim
39 words
A composition according to claim 1 wherein the amount of said carboxylic acid is about 40 to about 60 phr and the amount of said solvent is about 45 to about 55% (by weight based on said resinous carrier).
Claim 7
Dependent Claim
14 words
A composition according to claim 1 wherein said resinous carrier is an epoxy resin.
Claim 8
Dependent Claim
21 words
A composition according to claim 6 which includes about 0.1 to about 3 phr of a drier for said epoxy resin.
Claim 9
Dependent Claim
27 words
A composition according to claim 7 which is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said carboxylic acid.
Claim 10
Dependent Claim
14 words
A composition according to claim 1 wherein the solvent in said solution is toluene.
Claim 11
Dependent Claim
15 words
A composition according to claim 1 wherein said carboxylic acid is dispersed in said solution.
Claim 12
Dependent Claim
86 words
A method of protecting electrical apparatus from damage due to overheating and for thereafter determining the location of said overheating, said apparatus including a gas stream and a monitor for detecting particles in said gas stream and for emitting a signal when said particles are detected comprising: (A) preparing a composition according to claim 1; (B) applying said composition to said electrical apparatus at positions exposed to said gas stream; (C) evaporating said solvent; and (D) monitoring said gas stream for the presence of particles therein.
Claim 13
Dependent Claim
33 words
A method according to claim 11 including the additional last step of inspecting said apparatus visually for blistered and darkened areas, after a signal has been emitted, to locate the area of overheating.
Claim 14
Dependent Claim
29 words
A method according to claim 12 including the additional last steps of collecting a sample of said gas stream after a signal has been emitted, and analyzing said sample.
Claim 15
Dependent Claim
84 words
A thermoparticulating coating comprising a solid layer of room temperature, air-dried polyester or epoxy resinous carrier containing about 20 to about 250 phr of a thermoparticulating carboxylic acid having the general formula HOOCR, where R is ##STR16## or --CHR"R' where R' is alkyl to C 24 or carboxyalkyl to C 24 , R" is H or OH, and where X is independently selected from the group consisting of halogen, nitro, alkyl to C 5 , carboxy, and amino, and n is 1 to 5.
Claim 16
Dependent Claim
84 words
A thermoparticulating coating comprising a solid layer of room temperature, air-dried polyester or epoxy resinous carrier containing about 20 to about 250 phr of a thermoparticulating carboxylic acid having the general formula HOOCR, where R is ##STR16## or --CHR"R' where R' is alkyl to C 24 or carboxyalkyl to C 24 , R" is H or OH, and where X is independently selected from the group consisting of halogen, nitro, alkyl to C 5 , carboxy, and amino, and n is 1 to 5.
Claim 17
Dependent Claim
15 words
A coating according to claim 14 which is about 1/16 to about 1/2 inches thick.
Claim 18
Dependent Claim
44 words
A thermal detection system for electrical apparatus cooled by a gas stream comprising a coating according to claim 14 on a portion of said electrical apparatus exposed to said gas stream and a monitor for detecting the presence of particles in said gas stream.
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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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |